CN106488409B - Method, device and system for unicast transmission of broadcast multicast data - Google Patents

Abstract

The embodiment of the invention discloses a method for unicast transmission of broadcast multicast data, which comprises the following steps: the PGW selects an EPS bearer for transmitting the broadcast service according to the first session updating request sent by the PCRF; the PGW acquires an IP multicast service address of a broadcast service from the BMSC and binds the acquired IP multicast service address with the EPS bearing; and the PGW sends a second broadcast service transmission request to the MBMS gateway so that the MBMS gateway sends the broadcast service, searches the bound EPS bearer according to the IP multicast service address of the broadcast service forwarded by the MBMS gateway, and transmits the broadcast service through the EPS bearer. The technical scheme can fully utilize network equipment resources and reduce the communication pressure of the GCS application server equipment, thereby reducing the complexity and cost of developing the GCS application server equipment and meeting the service quality requirement of application with higher real-time requirement.

Description

Method, device and system for unicast sending broadcast multicast data

technical field

The present invention relates to the field of communication technologies, and in particular, to a method, device and system for unicast transmission of broadcast multicast data.

Background technique

With the development of wireless communication technology, the multimedia broadcast multicast service has been regarded as a very useful service by the communication industry. content. At present, multimedia broadcast and multicast services can already be implemented in mobile communication networks. For example, the Long Term Evolution (LTE, Long Term Evolution) system supports multimedia such as mobile TV through the Multimedia Broadcast Multicast Service (MBMS, Multimedia Broadcast Multicast Service) technology. Video broadcasting business.

In MBMS technology, the broadcast multicast service corresponds to the broadcast service area, and the LTE system uses the broadcast multicast bearer to send data from the group communication service (GCS, Group) to all user equipments (UE, User Equipment) in the broadcast service area of the broadcast multicast service. Communication Service) broadcast content of the application server, when the UE leaves the broadcast multicast service area, it will not receive the broadcast multicast service.

According to the prior art, if the UE cannot receive the broadcast multicast service, the LTE system can send the broadcast multicast service to the UE in a unicast manner. The UE can actively notify the GCS application server that it cannot receive the broadcast multicast service, and the GCS application server requests the Policy and Charging Rules Function (PCRF, Policy and Charging Rules Function) to send the broadcast multicast service through unicast, or the PCRF can also send the broadcast multicast service to the policy Subscribe to the events of UE's entry and exit broadcast coverage with the Policy and Charging Enforcement Function (PCEF, Policy and Charging Enforcement Function). When PCRF receives a unicast sending request sent by the GCS application server or an event report sent by PCEF that the UE leaves the broadcast coverage, PCRF formulates a (PCC, Policy and Charging Control) rule for unicast sending the broadcast multicast service and A session update is initiated, and then a packet data gateway (PGW, PDN Gateway) is triggered to establish a new UE bearer or modify the UE bearer, so that the PGW sends the broadcast multicast service through the UE bearer. However, the above technologies all send broadcast data to the PGW through the interface between the GCS application server and the PGW, which requires high performance of the GCS application server device, which increases the complexity and cost of developing the GCS application server device. In addition, according to the prior art, the unicast transmission of the broadcast service is initiated by the GCS application server, and a large number of application layer signaling between the UE and the GCS application server or control between the PCRF and the PCEF will be generated when the UE repeatedly enters and exits the broadcast service area. Faced signaling makes the process of converting broadcast multicast services from broadcast to unicast inefficient, resulting in broadcast service delays or data loss, which cannot meet applications with high real-time requirements, such as emergency rescue, business video conferencing, remote Monitoring and other business service quality requirements.

SUMMARY OF THE INVENTION

The embodiment of the present invention discloses a method, device and system for unicast sending broadcast multicast data, which can realize that the MBMS gateway forwards the broadcast multicast data to the PGW, so that the PGW sends the broadcast multicast data to a designated UE in a unicast manner , which reduces the performance requirements for GCS application server equipment, reduces the complexity and cost of developing GCS application server equipment, and at the same time improves the efficiency of starting or stopping unicast transmission of broadcast services, meeting the requirements of applications with high real-time requirements. Service quality requirements.

A first aspect of the embodiments of the present invention provides a method for unicast sending broadcast multicast data, including:

The PGW receives the first session update request sent by the PCRF, and selects the EPS bearer of the designated UE for transmitting the broadcast service, wherein the first session update request is used to instruct the PGW to transmit the broadcast service in a unicast manner;

The PGW sends a first broadcast service transmission request to a Broadcast Multicast Service Center (BMSC, Boradcast Multicast Service Centre) to obtain the IP multicast service address of the broadcast service, and associates the obtained IP multicast service address with all Describe the EPS bearer binding of the specified UE;

sending, by the PGW, a second broadcast service transmission request to the MBMS gateway to instruct the MBMS gateway to send the broadcast service;

The PGW searches for the bound EPS bearer of the designated UE according to the IP multicast service address of the broadcast service forwarded by the MBMS gateway, and transmits the broadcast service through the EPS bearer of the designated UE.

With reference to the first aspect, in a first possible implementation manner, the first session request includes a policy and charging control PCC rule of the broadcast service, wherein the PCC rule includes a temporary Mobile Group Identity (TMGI, Temporary Mobile Group Identity) or the TMGI and Flow ID (FlowID) of the broadcast service, the destination IP address and port number of the designated UE, and the Quality of Service (QoS, Quality of Service) of the broadcast service Requires and manages the BMSC identity of the broadcast service.

With reference to the first possible implementation manner of the first aspect, in the second possible implementation manner, the PGW receives the first session update request sent by the PCRF, and selects the EPS bearer of the designated UE for transmitting the broadcast service ,include:

The PGW receives the first session update request sent by the PCRF, obtains the PCC rule in the first session update request, and determines the designated UE according to the destination IP address of the designated UE in the PCC rule;

The PGW selects the established EPS bearer of the designated UE for transmitting the broadcast service according to the QoS requirements of the broadcast service in the PCC rule; or, establishes a new EPS bearer of the designated UE for transmitting all the broadcast services. the broadcasting service;

The PGW transmits the broadcast service through the EPS bearer of the designated UE, including:

The broadcast service is sent to the destination IP address and port number of the designated UE in the PCC rule through the EPS bearer of the designated UE.

With reference to any one of the first aspect to the second possible implementation manner of the first aspect, in a third possible implementation manner, the PGW sends a first broadcast service transmission request to the BMSC to obtain the broadcast service IP multicast service addresses, including:

The PGW sends a first broadcast service transmission request to the BMSC to trigger the BMSC to acquire the IP multicast service address of the broadcast service from the MBMS gateway;

The PGW receives the broadcast service transmission response sent by the BMSC, and acquires the IP multicast service address of the broadcast service included in the broadcast service transmission response.

With reference to any one of the first aspect to the third possible implementation manner of the first aspect, in a fourth possible implementation manner, the PGW transmits the broadcast service through the EPS bearer of the designated UE. After the step, the method further includes:

receiving, by the PGW, a second session update request sent by the PCRF, where the second session update request is used to instruct the PGW to stop transmitting the broadcast service in a unicast manner;

The PGW releases the binding of the IP multicast service address of the broadcast service with the EPS bearer of the designated UE, and stops transmitting the broadcast service through the EPS bearer of the designated UE;

sending, by the PGW, a first broadcast service stop transmission request to the BMSC to indicate to the BMSC that the PGW has stopped transmitting the broadcast service;

The PGW sends a second broadcast service stop transmission request to the MBMS gateway to instruct the MBMS gateway to stop forwarding the broadcast service to the PGW.

With reference to any one of the first aspect to the third possible implementation manner of the first aspect, in a fifth possible implementation manner, the PGW transmits the broadcast service through the EPS bearer of the designated UE. After the step, the method further includes:

When the broadcast service session ends, the PGW receives the broadcast service end indication sent by the BMSC;

The PGW releases the binding of the IP multicast service address of the broadcast service and the EPS bearer of the designated UE, and stops transmitting the broadcast service through the EPS bearer of the designated UE.

With reference to any one of the first aspect to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the PCC rule of the broadcast service includes a broadcast service transmission policy, wherein the The broadcast service transmission policy is used to indicate the location range for transmitting the broadcast service or for indicating whether the location range for transmitting the broadcast service is the coverage area of the broadcast service;

After the PGW sends a first broadcast service transmission request to the BMSC to obtain the IP multicast service address of the broadcast service, and binds the obtained IP multicast service address to the EPS bearer of the designated UE , the method also includes:

The PGW determines, according to the broadcast service transmission policy in the PCC rule in the first session update request, a position report area (PRA, Position Report Area) corresponding to the location range for transmitting the broadcast service, and reports to the mobility management entity (MME). , Mobility Management Entity) sends a subscription UE location change event request to request the MME to send the event that the designated UE enters the PRA and the event that the designated UE leaves the PRA;

The PGW transmits the broadcast service through the EPS bearer of the designated UE, including:

The PGW judges whether the designated UE is located within the location range of the broadcast service transmission according to the event that the UE enters or leaves the PRA sent by the MME, if the designated UE is located within the location range of the broadcast service transmission , the broadcast service is transmitted through the EPS bearer of the designated UE.

With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the PGW determines the broadcast service transmission policy according to the broadcast service transmission policy in the PCC rule in the first session update request. The PRA corresponding to the location range, including:

If the broadcast service transmission policy in the PCC rule in the first session update request is used to indicate whether the location range for transmitting the broadcast service is the coverage of the broadcast service, the PGW sends a subscription broadcast to the BMSC Service coverage request, to request the BMSC to send the coverage of the broadcast service;

The PGW determines the location range of the broadcast service transmission according to the coverage range of the broadcast service sent by the BMSC, and forms a PRA corresponding to the location range of the broadcast service transmission.

With reference to the sixth possible implementation manner or the seventh possible implementation manner of the first aspect, in the eighth possible implementation manner, after the PGW sends the MME a request to subscribe to the UE location change event, the method further include:

If the PGW receives the second session update request sent by the PCRF, or if the PGW receives the broadcast service end indication sent by the BMSC, the PGW sends a request to stop subscribing to the UE location change event to the MME to The MME is requested to stop sending the event that the designated UE enters the PRA and the event that the designated UE leaves the PRA.

A second aspect of the embodiments of the present invention provides a method for unicast sending broadcast multicast data, including:

The BMSC receives the first broadcast service transmission request sent by the PGW, where the first broadcast service transmission request is used to request to forward the IP multicast service address of the broadcast service;

Before the broadcast service session starts, the BMSC sends a session start request to the MBMS gateway to request the MBMS gateway to send the IP multicast service address of the broadcast service; or, during the broadcast service session, all The BMSC sends a broadcast service address request to the MBMS gateway to request the MBMS gateway to send the IP multicast service address of the broadcast service;

The BMSC forwards the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW, so that the PGW binds the IP multicast service address to the EPS bearer of the specified UE and passes the specified The EPS bearer of the UE transmits the broadcast service.

With reference to the second aspect, in a first possible implementation manner, the step of the BMSC forwarding the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW includes:

When the BMSC receives the session start response sent by the MBMS gateway, or when the BMSC receives the broadcast service address response sent by the MBMS gateway, the session start response or the broadcast service address response is included in the session start response or the broadcast service address response. The IP multicast service address of the broadcast service is forwarded to the PGW through the broadcast service transmission response.

In combination with the second aspect or the first possible implementation manner of the second aspect, in the second possible implementation manner, the BMSC forwards the IP multicast service address of the broadcast service sent by the MBMS gateway to the After the PGW, the method further includes:

The BMSC receives a first broadcast service stop transmission request sent by the PGW, where the first broadcast service stop transmission request is used to indicate that the PGW has stopped transmitting the broadcast service.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a third possible implementation manner, the BMSC forwards the IP multicast service address of the broadcast service sent by the MBMS gateway to the After the PGW, the method further includes:

When the broadcast service session ends, the BMSC sends a session end request to the MBMS gateway to request the MBMS gateway to end the broadcast service session;

When the BMSC receives the session end response sent by the MBMS gateway, it sends a broadcast service end indication to the PGW to instruct the PGW to stop transmitting the broadcast service.

With reference to any one of the second aspect to the third possible implementation manner of the second aspect, in a fourth possible implementation manner, the BMSC receives the PCC rule of the broadcast service sent by the PGW after receiving the PCRF After the step of sending the first broadcast service transmission request, the method further includes:

The BMSC receives the subscription broadcast service coverage request sent by the PGW after receiving the PCC rule of the broadcast service sent by the PCRF;

The BMSC sends the coverage of the broadcast service to the PGW, so that the PGW obtains a location range for transmitting the broadcast service according to the coverage of the broadcast service.

A third aspect of the embodiments of the present invention provides a method for unicast sending broadcast multicast data, including:

When the broadcast service session starts, the MBMS gateway receives the session start request sent by the BMSC, or, after the broadcast service session starts, the MBMS gateway receives the broadcast service address request sent by the BMSC, wherein the session start request and the broadcast service address request is used to obtain the IP multicast service address of the broadcast service;

The MBMS gateway sends the IP multicast service address of the broadcast service to the BMSC, so that the BMSC forwards the IP multicast service address of the broadcast service to the PGW;

After receiving the second broadcast service transmission request sent by the PGW, the MBMS gateway sends the broadcast service to the PGW through the IP multicast service address of the broadcast service, so that the PGW can pass the specified UE's IP multicast service address. The EPS bearer transmits the broadcast service.

With reference to the third aspect, in a first possible implementation manner, the MBMS gateway sends the IP multicast service address of the broadcast service to the BMSC, including:

The MBMS gateway sends the IP multicast service address of the broadcast service to the BMSC by sending a session start response, or by sending a broadcast service address response.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner, after the receiving the second broadcast service transmission request sent by the PGW, the method further includes:

After receiving the request for stopping transmission of the second broadcast service sent by the PGW, the MBMS gateway stops sending the broadcast service to the PGW.

A fourth aspect of the embodiments of the present invention provides a packet data gateway, including:

a receiving unit, configured to receive a first session update request sent by the PCRF, where the first session update request is used to instruct the PGW to transmit the broadcast service in a unicast manner;

a processing unit, configured to select, according to the first session update request received by the receiving unit, the EPS bearer of the designated UE for transmitting the broadcast service;

an acquisition unit, configured to send a first broadcast service transmission request to the BMSC to acquire the IP multicast service address of the broadcast service;

a sending unit, configured to send a second broadcast service transmission request to the MBMS gateway to instruct the MBMS gateway to send the broadcast service;

The processing unit is further configured to search for the bound EPS bearer of the specified UE according to the IP multicast service address of the broadcast service forwarded by the MBMS gateway, and transmit the EPS bearer of the specified UE through the EPS bearer of the specified UE. the broadcasting service.

With reference to the fourth aspect, in a first possible implementation manner, the first session request includes a policy and charging control PCC rule of the broadcast service, wherein the PCC rule includes a temporary Mobility group identity TMGI or TMGI of the broadcast service and flow identity FlowID, destination IP address and port number of the designated UE, QoS requirements for the quality of service of the broadcast service, and BMSC identity for managing the broadcast service.

With reference to the first possible implementation manner of the fourth aspect, in the second possible implementation manner, the processing unit is specifically configured to:

acquiring the PCC rule in the first session update request received by the receiving unit, and determining the designated UE according to the destination IP address of the designated UE in the PCC rule;

Select the established EPS bearer of the designated UE to transmit the broadcast service according to the QoS requirements of the broadcast service in the PCC rule; or, establish a new EPS bearer of the designated UE to transmit the broadcast service ;

The broadcast service is sent to the destination IP address and port number of the designated UE in the PCC rule through the EPS bearer of the designated UE.

With reference to any one of the fourth aspect to the second possible implementation manner of the fourth aspect, in a third possible implementation manner, the obtaining unit is specifically configured to:

sending a first broadcast service transmission request to the BMSC, to trigger the BMSC to obtain the IP multicast service address of the broadcast service from the MBMS gateway;

Receive the broadcast service transmission response sent by the BMSC, and obtain the IP multicast service address of the broadcast service included in the broadcast service transmission response.

With reference to any one of the fourth aspect to the third possible implementation manner of the fourth aspect, in the fourth possible implementation manner, the receiving unit is further configured to:

receiving a second session update request sent by the PCRF, where the second session update request is used to instruct the PGW to stop transmitting broadcast services in a unicast manner;

The processing unit is further configured to release the binding of the IP multicast service address of the broadcast service and the EPS bearer of the designated UE, and stop transmitting the broadcast service through the EPS bearer of the designated UE;

The sending unit is further configured to send a first broadcast service stop transmission request to the BMSC to indicate to the BMSC that the PGW has stopped transmitting the broadcast service; send a second broadcast service stop transmission request to the MBMS gateway to instruct the MBMS gateway to stop forwarding the broadcast service to the PGW.

With reference to any of the third possible implementation manners of the fourth aspect to the fourth aspect, in a fifth possible implementation manner, the receiving unit is further configured to:

When the broadcast service session ends, receive the broadcast service end indication sent by the BMSC;

The processing unit is further configured to release the binding of the IP multicast service address of the broadcast service and the EPS bearer of the designated UE, and stop transmitting the broadcast service through the EPS bearer of the designated UE.

With reference to any one of the fourth aspect to the fifth possible implementation manner of the fourth aspect, in a sixth possible implementation manner, the PCC rule of the broadcast service includes a broadcast service transmission policy, wherein the The broadcast service transmission policy is used to indicate the location range for transmitting the broadcast service or for indicating whether the location range for transmitting the broadcast service is the coverage area of the broadcast service;

The processing unit is further configured to, according to the broadcast service transmission policy in the PCC rule in the first session update request, determine the location reporting area PRA corresponding to the location range for transmitting the broadcast service;

The device also includes:

a subscription unit, configured to send a subscription UE location change event request to the MME, so as to request the MME to send the event that the designated UE enters the PRA and the event that the designated UE leaves the PRA;

The processing unit is further configured to determine whether the designated UE is located within the location range of the transmission broadcast service according to the event of the UE entering or leaving the PRA sent by the MME, if the designated UE is located in the transmission broadcast service. Within the location range of the service, the broadcast service is transmitted through the EPS bearer of the designated UE.

With reference to the sixth possible implementation manner of the fourth aspect, in the seventh possible implementation manner, the sending unit is further configured to:

If the broadcast service transmission policy in the PCC rule in the first session update request is used to indicate whether the location range for transmitting the broadcast service is the coverage range of the broadcast service, send the subscription broadcast service coverage to the BMSC request, to request the BMSC to send the coverage of the broadcast service;

The processing unit is further configured to determine the location range of the broadcast service transmission according to the coverage range of the broadcast service sent by the BMSC, and form a PRA corresponding to the location range of the broadcast service transmission.

With reference to the sixth possible implementation manner or the seventh possible implementation manner of the fourth aspect, in the eighth possible implementation manner, the subscription unit is further used for:

If the receiving unit receives the second session update request sent by the RCRF, or if the receiving unit receives the broadcast broadcast service end indication sent by the BMSC, it sends a request to stop subscribing to the UE location change event to the MME to request all The MME stops sending the event that the designated UE enters the PRA and the event that the designated UE leaves the PRA.

A fifth aspect of the embodiments of the present invention provides a multicast broadcast service center device, including:

a receiving unit, configured to receive a first broadcast service transmission request sent by the PGW, where the first broadcast service transmission request is used to request to forward the IP multicast service address of the broadcast service;

a sending unit, configured to send a session start request to the MBMS gateway before the broadcast service session starts, so as to request the MBMS gateway to send the IP multicast service address of the broadcast service; or, while the broadcast service session is in progress , sending a broadcast service address request to the MBMS gateway to request the MBMS gateway to send the IP multicast service address of the broadcast service;

The sending unit is further configured to forward the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW, so that the PGW associates the IP multicast service address with the EPS bearer of the designated user equipment UE. The broadcast service is bound and transmitted through the EPS bearer of the designated UE.

With reference to the fifth aspect, in a first possible implementation manner, the receiving unit is further configured to:

receiving a session start response or a broadcast service address response sent by the MBMS gateway;

The sending unit is specifically configured to, when the receiving unit receives a session start response or a broadcast service address response sent by the MBMS gateway, send the address of the broadcast service in the session start response or the broadcast service address response. The IP multicast service address is forwarded to the PGW through a broadcast service transmission response.

With reference to the fifth aspect or the first possible implementation manner of the fifth aspect, in the second possible implementation manner, the receiving unit is further configured to:

A first broadcast service stop transmission request sent by the PGW is received, where the first broadcast service stop transmission request is used to indicate that the PGW has stopped transmitting the broadcast service.

With reference to the fifth aspect or the first possible implementation manner of the fifth aspect, in a third possible implementation manner, the sending unit is further configured to:

When the broadcast service session ends, sending a session end request to the MBMS gateway to request the MBMS gateway to end the broadcast service session;

The receiving unit is further configured to receive a session end response sent by the MBMS gateway;

The sending unit is further configured to, when the receiving unit receives a session end response sent by the MBMS gateway, send a broadcast service end indication to the PGW to instruct the PGW to stop transmitting the broadcast service.

With reference to any one of the third possible implementation manners of the fifth aspect to the fifth aspect, in a fourth possible implementation manner, the receiving unit is further configured to receive the PCRF sent by the PGW after receiving the The subscription broadcast service coverage request sent after the PCC rule of the broadcast service;

The sending unit is further configured to send the coverage of the broadcast service to the PGW, so that the PGW obtains a location range for transmitting the broadcast service according to the coverage of the broadcast service.

A sixth aspect of the embodiments of the present invention provides a multimedia broadcast multicast service gateway, including:

A receiving unit, configured to receive a session start request sent by the BMSC when a broadcast service session starts, or, after the broadcast service session starts, receive a broadcast service address request sent by the BMSC, wherein the session start request and The broadcast service address request is used to obtain the IP multicast service address of the broadcast service;

a sending unit, configured to send the IP multicast service address of the broadcast service to the BMSC, so that the BMSC forwards the IP multicast service address of the broadcast service to the PGW;

The receiving unit is further configured to receive a second broadcast service transmission request sent by the PGW;

The sending unit is further configured to, after the receiving unit receives the second broadcast service transmission request sent by the PGW, send the broadcast service to the PGW through the IP multicast service address of the broadcast service, so that the PGW transmits the broadcast service through the EPS bearer of the designated UE.

With reference to the sixth aspect, in a first possible implementation manner, the sending unit is specifically configured to:

Send the IP multicast service address of the broadcast service to the BMSC by sending a session start response, or by sending a broadcast service address response.

With reference to the sixth aspect or the first possible implementation manner of the sixth aspect, in the second possible implementation manner, the receiving unit is further configured to:

receiving a second broadcast service stop transmission request sent by the PGW;

The sending unit is further configured to stop sending the broadcast service to the PGW after the receiving unit receives the second broadcast service stop transmission request sent by the PGW.

A seventh aspect of the embodiments of the present invention provides a communication system for unicast sending broadcast multicast data, the system comprising a packet data gateway, a multicast broadcast service center device, and a multimedia broadcast multicast service gateway;

The packet data gateway is the device described in any one of the fourth aspect to the fifth possible implementation manner of the fourth aspect of the embodiments of the present invention;

The multicast broadcast service center device is the device described in any one of the fifth possible implementation manners of the fifth aspect to the fifth aspect of the embodiments of the present invention;

The multimedia broadcast multicast service gateway is the device described in any one of the sixth aspect to the second possible implementation manner of the sixth aspect of the embodiments of the present invention.

An eighth aspect of the embodiments of the present invention provides a communication system for unicast transmission of broadcast multicast data, the system includes a packet data gateway, a multicast broadcast service center device, a multimedia broadcast multicast service gateway, and a mobility management entity device;

The packet data gateway is the device described in any one of the six possible implementation manners to the eighth possible implementation manner of the fourth aspect of the embodiments of the present invention;

The multicast broadcast service center device is the device described in any one of the fifth possible implementation manners of the fifth aspect to the fifth aspect of the embodiments of the present invention;

The multimedia broadcast multicast service gateway is the device described in any one of the sixth aspect to the second possible implementation manner of the sixth aspect of the embodiments of the present invention;

The mobility management entity device is configured to receive a subscribed UE location change event request sent by the packet data gateway, and send to the packet data gateway according to the subscribed UE location change event request that the UE enters or leaves the specified PRA. event.

In the technical solution of the embodiment of the present invention, after the GCS application server initiates the unicast transmission of the broadcast service, the PGW receives the first session update request sent by the PCRF, the PGW selects the EPS bearer of the designated UE to transmit the broadcast service, and transmits the broadcast service through the BMSC. Obtain the IP multicast service address of the broadcast service from the MBMS gateway, and bind the IP multicast service address of the broadcast service to the EPS bearer of the UE; the PGW requests the MBMS gateway to forward the broadcast service, and according to the broadcast service forwarded by the MBMS gateway The IP multicast service address of the service searches for the bound EPS bearer of the designated UE, and transmits the broadcast service through the EPS bearer of the designated UE, thereby realizing unicast transmission of broadcast data. It can be seen that in the unicast transmission of the broadcast service, the technical solution proposed by the embodiment of the present invention utilizes the MBMS gateway with high performance itself to forward the broadcast service to the PGW for unicast transmission, instead of using the GCS application server to send the broadcast service to the PGW. , the PGW can find the EPS bearer of the designated UE according to the IP multicast service address of the broadcast service forwarded by the MBMS gateway, and send the broadcast service through the EPS bearer of the designated UE, so the network equipment resources are fully utilized and the communication of the GCS application server equipment is reduced. pressure, thereby reducing the complexity and cost of developing GCS application server equipment.

Further, the PGW sends a subscription UE location change event request to the MME before sending the broadcast data, to request the MME to send an event specifying that the UE enters and leaves the PRA corresponding to the location range for transmitting the broadcast service; the PGW enters or leaves according to the specified UE sent by the MME. The event of the above PRA judges whether the designated UE is located within the location range for transmitting the broadcast service, and if the designated UE is located within the location range for transmitting the broadcast service, the broadcast service is transmitted through the EPS bearer of the designated UE. It can be seen that the technical solution proposed in the embodiment of the present invention enables the PGW to automatically control whether to start or stop the unicast transmission of the broadcast service, without the need for the GCS application server to trigger the start or stop of the broadcast every time the UE enters or leaves the location range for transmitting the broadcast service. The process of service unicast transmission. Therefore, a lot of GCS application server signaling and other related control signaling are saved, the signaling overhead of the communication network is reduced, and the efficiency of starting the unicast transmission of broadcast services or stopping the unicast transmission of broadcast services is improved, and the real-time requirements are met. Higher application quality of service requirements.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic diagram of a network structure for implementing the MBMS technology provided by an embodiment of the present invention;

2 is a schematic flowchart of a method for unicast sending broadcast multicast data according to Embodiment 1 of the present invention;

Fig. 3 is a kind of signaling schematic diagram that GCS application server starts unicast transmission broadcast service provided by the embodiment of the present invention;

4 is a schematic diagram of signaling of a BMSC starting a unicast transmission broadcast service provided by an embodiment of the present invention;

5 is a schematic flowchart of a method for unicast sending broadcast multicast data according to Embodiment 2 of the present invention;

Fig. 6 is a kind of GCS application server according to the embodiment of the present invention to initiate the signaling schematic diagram of stopping unicast transmission broadcast service;

Fig. 7 is a kind of signaling schematic diagram that BMSC initiates to stop unicast transmission broadcast service provided by the embodiment of the present invention;

8 is a schematic flowchart of a method for unicast sending broadcast multicast data according to Embodiment 3 of the present invention;

Fig. 9 is another kind of GCS application service period that the present invention provides the signaling schematic diagram of starting unicast transmission broadcast service;

10 is a schematic diagram of signaling of another BMSC initiating a unicast transmission broadcast service provided by an embodiment of the present invention;

11 is a schematic flowchart of a method for unicast sending broadcast multicast data according to Embodiment 4 of the present invention;

12 is a schematic flowchart of a method for unicast sending broadcast multicast data according to Embodiment 5 of the present invention;

FIG. 13 is a schematic flowchart of a method for unicast sending broadcast multicast data according to Embodiment 6 of the present invention.

14 is a schematic structural diagram of a packet data gateway according to Embodiment 7 of the present invention;

15 is a schematic structural diagram of a broadcast multicast service center device according to Embodiment 8 of the present invention;

16 is a schematic structural diagram of a multimedia broadcast multicast service gateway according to Embodiment 9 of the present invention;

17 is a schematic structural diagram of another packet data gateway according to Embodiment 10 of the present invention;

18 is a schematic structural diagram of another broadcast multicast service center device according to Embodiment 11 of the present invention;

19 is a schematic structural diagram of another multimedia broadcast multicast service gateway provided by Embodiment 12 of the present invention;

20 is a schematic structural diagram of a communication system according to Embodiment 13 of the present invention;

FIG. 21 is a schematic structural diagram of another communication system according to Embodiment 14 of the present invention.

Detailed ways

The current network structure used to implement the MBMS technology in the LTE system can be seen in Figure 1. The process of implementing broadcast service transmission is as follows: First, the GCS application server applies to the BMSC for a TMGI for identifying the broadcast service through the MB2-C interface. Each TMGI corresponds to a broadcast multicast bearer, the BMSC allocates TMGI, QoS requirements and service validity period for the broadcast service, and sends the TMGI and service validity period of the broadcast service to the GCS application server. Before the GCS application server sends the broadcast service, activate the broadcast multicast bearer of the broadcast service, determine the coverage and QoS requirements of the broadcast service, and notify the BMSC of the coverage and QoS requirements of the broadcast service. For the same broadcast service, Flow ID can be used to identify broadcast services with different coverage. The BMSC sends the coverage and QoS requirements obtained from the GCS application server to the MBMS gateway, and the MBMS gateway initiates a broadcast multicast bearer activation request to the MME. The Mobility Management Element (MME, Mobility Manage Element) initiates the establishment of a broadcast multicast bearer to all Evolved Universal Terrestrial Radio Access Network (E-UTRAN, Evolved Universal Terrestrial Radio Access Network) (ie, base stations) covered by the broadcast service, and the establishment is successful. The E-UTRAN that bears the broadcast multicast can request the MBMS gateway to register and send the broadcast service, so that the MBMS gateway sends the broadcast service to all E-UTRANs within the coverage of the broadcast service, and the E-UTRAN sends the broadcast service to the E-UTRAN through the broadcast multicast bearer. The UE sends broadcast services. Some E-UTRANs may not be able to establish a broadcast multicast bearer due to insufficient radio resources, so that UEs under the E-URAN cannot receive related broadcast multicast services through the broadcast multicast bearer. At the same time, when the UE leaves the coverage of the broadcast multicast service, it cannot receive the relevant broadcast multicast service.

If the UE cannot receive the broadcast multicast service, the network can send the broadcast multicast service to the UE in a unicast manner. The UE can actively notify the GCS application server that it cannot receive the broadcast multicast service, and the GCS application server requests the PCRF to send the broadcast multicast service through unicast, or the PCRF can also subscribe to the PCEF for the events of the UE entering and leaving the broadcast service area. When PCRF receives the unicast sending request sent by the GCS application server or the UE leaving the broadcast service area event report sent by the PCEF, the PCRF formulates the PCC rule for unicast sending the broadcast multicast service, and then triggers the PGW to establish a new UE bearer Or modify the UE bearer, so that the PGW sends the broadcast multicast service through the UE bearer.

Researchers in the field have found that in the above technologies, the GCS application server must send the broadcast data to the PGW through the SGi interface with the PGW, so that the PGW sends the broadcast data to the UE through the EPS bearer of the UE, that is, unicast The broadcast data is sent to the UE by means of the method, which puts a great pressure on the communication of the GCS application server, and increases the complexity and cost of developing the GCS application server device. In addition, according to the above technology, the unicast transmission of the broadcast service is initiated by the GCS application server, and a large number of application layer signaling between the UE and the GCS application server or the control plane between the PCRF and the PCEF will be generated when the UE repeatedly enters and exits the broadcast service area. Signaling makes the start of broadcast service unicast transmission inefficient, resulting in broadcast service delay or data loss, which cannot meet the service quality requirements of applications with high real-time requirements, such as emergency rescue, business video conferencing, remote monitoring and other services.

Embodiments of the present invention provide a method, device and system for unicast transmission of broadcast-multicast data, which can utilize an MBMS gateway with higher performance in the unicast transmission of broadcast services instead of using a GCS application server to send broadcast services To the PGW, so that the PGW sends broadcast multicast data to the UE in a unicast manner, which makes full use of network equipment resources, reduces the communication pressure of the GCS application server equipment, and reduces the complexity and cost of developing the GCS application server equipment. At the same time, the technical solutions provided by the embodiments of the present invention can enable the PGW to automatically control whether to start or stop the unicast transmission of the broadcast service, without the need to be triggered by the GCS application server to start or stop the process of the unicast transmission of the broadcast service, so a large number of GCS applications can be saved. Server signaling and other control signaling reduce the signaling overhead of the communication network, improve the efficiency of starting or stopping unicast transmission of broadcast services, and meet the service quality requirements of applications with high real-time requirements.

At the same time, before the broadcast service session starts, the BMSC can automatically initiate the unicast transmission of the broadcast service according to the saved broadcast service information (the information records the PGW that unicast the broadcast service), or when the broadcast service session ends, The BMSC automatically initiates and terminates the unicast transmission of the broadcast service without the need for the GCS application server to initiate or end the unicast transmission, so the control signaling of the GCS application server is reduced, and the unicast start or stop of the broadcast service can also be improved. transmission efficiency.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Each embodiment will be described below.

The terms "first", "second", "third" and "fourth" in the description and claims of the present invention and the above drawings are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices.

Referring first to FIG. 2 , FIG. 2 is a schematic flowchart of a method for unicast sending broadcast multicast data according to Embodiment 1 of the present invention. Wherein, as shown in FIG. 2 , a method for unicast sending broadcast multicast data provided in Embodiment 1 of the present invention, used in a PGW, may include the following steps:

S101. The PGW receives the first session update request sent by the PCRF, and selects the EPS bearer of the designated UE for transmitting the broadcast service, wherein the first session update request is used to instruct the PGW to transmit the broadcast service in a unicast manner.

In the technical solution proposed by the embodiment of the present invention, the GCS application server initiates unicast transmission of the broadcast service to the designated UE initially. In a specific implementation, during a broadcast service session, if some E-UTRAN cannot establish a broadcast multicast bearer, the UE under the E-URAN cannot receive the relevant broadcast multicast service through the broadcast multicast bearer, or when the UE is unable to receive the relevant broadcast multicast service through the broadcast multicast bearer. When leaving the coverage of the broadcast multicast service, the relevant broadcast multicast service cannot be received. The UE can notify the GCS application server that the broadcast service cannot be received through the GC1 interface, and the GCS application server can send a unicast transmission request to the PCRF to request the network to The broadcast service is sent to the UE in unicast mode. Or when the GCS application server wishes to send a broadcast service to the UE in a unicast manner, it can also send a unicast transmission request to the PCRF. As shown in Figure 3, the PCRF receives the unicast transmission request sent by the GCS application server, which may include the TMGI of the broadcast service or the TMGI and Flow ID of the broadcast service, the unicast transmission instruction, the BMSC identity that manages the broadcast service, and the specified UE's ID. Destination IP address and port number. The PCRF formulates the PCC rule of the broadcast service according to the unicast transmission request, and sends a first session update request to the PGW to trigger the PGW to send the broadcast service to the designated UE through the EPS bearer.

The PGW first selects the EPS bearer of the designated UE for sending the broadcast service. Specifically, after receiving the first session update request sent by the PCRF, the PGW obtains the PCC rules of the broadcast service in it, and selects the EPS bearer of the designated UE for the broadcast service. The broadcast service is transmitted. The PCC rules formulated by the PCRF include the TMGI of the broadcast service or the TMGI and Flow ID of the broadcast service, the destination IP address and port number of the designated UE, the QoS requirements of the broadcast service, and the BMSC identifier for the management of the broadcast service. The PGW first determines the designated UE according to the destination IP address of the designated UE in the PCC rule. Then, the bearer with the closest QoS to the QoS in the PCC rule is selected from the established EPS bearer of the designated UE to transmit the broadcast service, and the PGW completes the mapping of the broadcast service flow to the bearer through the bearer modification process. Alternatively, the PGW may establish a new EPS bearer for the designated UE for transmitting broadcast services.

S102: The PGW sends a first broadcast service transmission request to the BMSC to obtain the IP multicast service address of the broadcast service, and binds the obtained IP multicast service address with the EPS bearer of the designated UE.

After the PGW selects the EPS bearer of the designated UE for transmitting the broadcast service, it obtains the IP multicast service address of the broadcast service. The IP multicast service address is the destination address of the MBMS gateway to send the broadcast service, and can be used to distinguish different broadcast services. It may include address information such as IP address, port number, and GPRS Tunneling Protocol (GTP, GPRS Tunneling Protocol) tunnel endpoint identity (TEID, Tunnel Endpoint Identity). After the PGW binds the obtained IP multicast service address to the EPS bearer of the designated UE, it can find the EPS bearer of the designated UE through the IP multicast service address of the broadcast service, so as to send the broadcast service on the bearer. Since the IP multicast service address is allocated by the MBMS gateway, the PGW sends the first broadcast service transmission request to the BMSC to trigger the BMSC to send the IP multicast service address request to the MBMS gateway.

In a specific implementation, if the broadcast service session is already in progress when the BMSC receives the first broadcast service transmission request sent by the PGW, the BMSC records the PGW in the information of the broadcast service and immediately sends the broadcast service address request to the MBMS gateway , to request the MBMS gateway to send the IP multicast service address of the broadcast service. Figure 3 shows a schematic diagram of the signaling of the initial unicast transmission of the broadcast service initiated by the GCS application server. As shown in Figure 3, if the BMSC receives the first broadcast service transmission request sent by the PGW, the broadcast service session is already in progress, then immediately A broadcast service address request is sent to the MBMS gateway, and when the MBMS gateway receives the broadcast service address request, the IP multicast service address of the broadcast service is included in the broadcast service address response and sent to the BMSC. The BMSC obtains the IP multicast service address from the broadcast service address response, and forwards the IP multicast service address to the PGW through the broadcast service transmission response. It is worth noting that if the PGW has obtained the IP multicast service address of the broadcast service, it does not need to send the first broadcast service transmission request to the BMSC to obtain the IP multicast service of the broadcast service, that is, the PGW skips this step. If the BMSC receives the first broadcast service transmission request sent by the PGW before the broadcast service session starts, the BMSC first records the PGW in the information of the broadcast service, and adds the broadcast service to the session start request sent to the MBMS gateway when the broadcast session starts. Service address request indication to request the MBMS gateway to send the IP multicast service address of the broadcast service. Figure 4 shows a schematic diagram of the signaling diagram of the BMSC initiating unicast transmission of broadcast services. As shown in Figure 4, when the MBMS gateway receives the session start request, it allocates an IP multicast service address for the broadcast service and includes the IP multicast service address. Sent to the BMSC in the Session Start Response. The BMSC obtains the IP multicast service address from the session start response, and forwards the IP multicast service address to the PGW through the broadcast service transmission response.

In the specific implementation, the IP multicast service address does not need to be obtained repeatedly, that is, when the PGW obtains the IP multicast service address of the broadcast service after receiving the first first session update request of the broadcast service sent by the PCRF, it will receive the IP multicast service address subsequently. The first session update request of the broadcast service does not need to request to obtain the IP multicast service address of the broadcast service.

As shown in FIG. 3 or FIG. 4 , after receiving the broadcast service transmission response sent by the BMSC, the PGW obtains the IP multicast service address of the broadcast service therein, and compares the IP multicast service address with the IP multicast service address selected by the PGW in step S101 The EPS bearer of the designated UE is bound, so that the PGW transmits the broadcast service through the EPS bearer of the designated UE when receiving the broadcast service.

In the specific implementation, if the broadcast service needs to be sent to a specific target IP address and port number, the PCC rule contains the destination IP address and port number of the specified UE, and the PGW can add the destination IP address and port number to the IP obtained above. Multicast service address binding. When receiving the broadcast service, the PGW first finds the EPS bearer of the designated UE according to the IP multicast service address of the broadcast service, and then sends the broadcast service to the destination IP address and port number of the designated UE through the EPS bearer of the designated UE.

S103: The PGW sends a second broadcast service transmission request to the MBMS gateway to instruct the MBMS gateway to forward the broadcast service.

As shown in Figure 3 or Figure 4, after the PGW binds the IP multicast service address of the broadcast service to the EPS bearer of the designated UE, it sends a second broadcast service transmission request to the MBMS gateway to instruct the MBMS gateway to forward the broadcast service to PGW. After receiving the second broadcast service transmission request, the MBMS gateway records the PGW in the broadcast service information, and forwards the broadcast service to the PGW when the MBMS receives the broadcast service data. In the specific implementation, a logical transmission channel can be established between the MBMS gateway and the PGW, and the MBMS gateway sends the broadcast service to the E-UTRAN and the PGW through the IP multicast service address, so that the E-UTRAN transmits the broadcast service in the broadcast multicast bearer , so that the PGW transmits the broadcast service in the EPS bearer. Because MBMS broadcasting originally needs to copy the broadcast data into multiple copies and distribute them to multiple E-UTRANs, and sending more copies to the PGW will not put pressure on the MBMS gateway, so that the MBMS gateway with higher performance can be used to forward the broadcast. The service data is sent to the PGW instead of using the GCS application server to send the broadcast service to the PGW, which reduces the performance requirements for the GCS application server device.

S104: The PGW searches for the bound EPS bearer of the designated UE according to the IP multicast service address of the broadcast service forwarded by the MBMS gateway, and transmits the broadcast service through the EPS bearer of the designated UE.

After receiving the broadcast service forwarded by the MBMS gateway from the IP multicast service address, the PGW searches for the above-mentioned designated UE bound to the IP multicast service address according to the IP multicast service address (including address information such as IP address, port number, and GTP TEID). EPS bearer, and transmit broadcast services through the EPS bearer.

In a specific implementation, if the broadcast service needs to be sent to the specified target IP address and port number, the PCC rule includes the destination IP address and port number of the specified UE. In step S103, the PGW has added the IP multicast service address to the specified UE's The destination IP address and port number are bound. When receiving the broadcast service, the PGW can first find the EPS bearer of the designated UE according to the IP multicast service address of the broadcast service, and then send the broadcast service to the destination IP address and port number of the designated UE through the EPS bearer of the designated UE.

It can be seen that after the GCS application server initiates the unicast transmission of the broadcast service, the PGW receives the first session update request sent by the PCRF, the PGW selects the EPS bearer of the designated UE for transmitting the broadcast service, and obtains the broadcast service from the MBMS gateway through the BMSC. IP multicast service address, bind the IP multicast service address of the broadcast service to the EPS bearer of the UE; the PGW requests the MBMS gateway to forward the broadcast service, and searches for the bound IP multicast service address according to the IP multicast service address of the broadcast service forwarded by the MBMS gateway The EPS bearer of the UE is designated, and the broadcast service is transmitted through the EPS bearer of the designated UE, thereby realizing unicast transmission of broadcast data. The technical solution proposed by the embodiment of the present invention utilizes the MBMS gateway with higher performance to forward the broadcast service to the PGW for unicast transmission in realizing the unicast transmission of broadcast data, instead of using the GCS application server to send the broadcast service to the PGW, The PGW can find the EPS bearer of the designated UE according to the IP multicast service address of the broadcast service sent by the MBMS gateway, and send the broadcast service through the EPS bearer of the designated UE, thus making full use of the network equipment resources and reducing the communication pressure on the GCS application server equipment , thereby reducing the complexity and cost of developing GCS application server equipment.

Embodiment 2 of the present invention provides a method for unicast sending broadcast-multicast data. Referring to FIG. 5, FIG. 5 is a schematic flowchart of a method for unicast sending broadcast-multicast data according to Embodiment 2 of the present invention, as shown in FIG. 5, the method provided by the second embodiment of the present invention may include the following steps:

S201. The PGW receives a second session update request sent by the PCRF, where the second session update request is used to instruct the PGW to stop transmitting the broadcast service in a unicast manner.

In the technical solution proposed in the embodiment of the present invention, after the PGW transmits the broadcast service through the EPS bearer of the designated UE, the GCS application server can initiate the stop of unicast transmission of the broadcast service to the designated UE, or when the broadcast service session ends, the BMSC automatically initiates Stop unicast transmission of broadcast services. Figure 6 shows a schematic diagram of signaling of stopping unicast transmission of broadcast services initiated by the GCS application server. As shown in Figure 6, the GCS application server sends a request to stop unicast transmission to PCRF to request the network to stop sending broadcast services in unicast mode. The PCRF receives the stop unicast transmission request sent by the GCS application server, which may include the TMGI of the broadcast service or the TMGI and Flow ID of the broadcast service, the stop unicast transmission instruction, and the specified target IP address and port number of the UE. The PCRF sends a second session update request to the PGW to trigger the PGW to stop sending the broadcast service to the designated UE through the EPS bearer.

S202. The PGW releases the binding of the IP multicast service address of the broadcast service and the EPS bearer of the designated UE, and stops transmitting the broadcast service through the EPS bearer of the designated UE.

After receiving the second session update request sent by the PCRF, the PGW releases the binding between the IP multicast service address of the broadcast service and the EPS bearer of the designated UE. In a specific implementation, the second session update request may include information such as the TMGI of the broadcast service or the TMGI and Flow ID of the broadcast service, the target IP address and port number of the specified UE, and the PGW can find the target IP address and port number according to the target IP address and port number. IP multicast service address corresponding to the broadcast service, and unbind the IP multicast service address from the EPS bearer of the designated UE bound to it. After the PGW unbinds the IP multicast service address of the broadcast service and the EPS bearer of the designated UE, it stops transmitting the broadcast service through the EPS bearer of the designated UE.

S203. The PGW sends a first broadcast service stop transmission request to the BMSC to indicate to the BMSC that the PGW has stopped transmitting the broadcast service.

After the PGW stops transmitting the broadcast service through the EPS bearer of the designated UE, it may send a first broadcast service stop request to the BMSC to indicate to the BMSC that the PGW has stopped transmitting the broadcast service. In a specific implementation, when the PGW does not send the above broadcast service to all the UEs in the PGW through the EPS, it sends a first broadcast service stop request to the BMSC to indicate to the BMSC that the PGW has stopped transmitting the broadcast service. When the BMSC receives the above-mentioned first broadcast service stop transmission request, it deletes the PGW information in the broadcast service information.

S204: The PGW sends a second broadcast service stop transmission request to the MBMS gateway to instruct the MBMS gateway to stop forwarding the broadcast service to the PGW.

The PGW sends a second broadcast service stop transmission request to the MBMS gateway to instruct the MBMS gateway to stop forwarding the above broadcast service to the PGW. In a specific implementation, when the PGW does not send the above broadcast service to all UEs in the PGW through EPS, it sends a second broadcast service stop transmission request to the MBMS gateway to instruct the MBMS gateway to stop forwarding the above broadcast service. As shown in FIG. 6 , after receiving the request for stopping transmission of the second broadcast service, the MBMS gateway deletes the above-mentioned PGW information recorded in the broadcast service information. When the MBMS receives the broadcast service data, it stops forwarding the broadcast service to the above-mentioned PGW.

In some feasible implementations, when the broadcast service session ends, the BMSC can automatically initiate unicast transmission to end the broadcast service. Figure 7 shows a schematic diagram of the signaling flow that the BMSC initiates to stop the unicast transmission of the broadcast service when the broadcast service session ends. As shown in Figure 7, when the BMSC sends a session stop request to the MBMS gateway and receives a session stop response fed back by the MBMS gateway , sending a broadcast service end indication to the PGW to instruct the PGW to stop sending the broadcast service in a unicast manner. In a specific implementation, because the BMSC can receive the first broadcast service transmission request sent by the PGW to record the information of the PGW when the PGW sends the broadcast service in a unicast manner, the BMSC can send the broadcast service end to all the PGWs recorded in the broadcast service information. The instruction is used to instruct the PGW to stop sending the above-mentioned broadcast service in a unicast manner. After the PGW receives the broadcast service end indication, it will release all UE EPS bearers bound to the IP multicast service address of the broadcast service, and stop transmitting the broadcast service through the UE's EPS bearer.

It can be seen that after the GCS application server initiates to stop the unicast transmission of the broadcast service to the designated UE, the PGW receives the second session update request sent by the PCRF, unbinds the IP multicast service address of the broadcast service and the EPS bearer of the designated UE, and stops The broadcast service is transmitted through the EPS bearer of the designated UE; the PGW sends the first broadcast service stop transmission request to the BMSC, and sends the second broadcast service stop request to the MBMS gateway to instruct the MBMS to stop forwarding the broadcast service to the PGW. The technical solution proposed by the embodiment of the present invention utilizes the MBMS gateway with high performance to forward the broadcast service to the PGW for unicast transmission in realizing the unicast transmission of broadcast data. When the GCS application server triggers to stop the unicast transmission of the broadcast service or when When the broadcast service session ends, the MBMS gateway may stop forwarding the broadcast service to the PGW, and the PGW may stop sending the broadcast service in a unicast manner.

Embodiment 3 of the present invention provides a method for unicast sending broadcast multicast data. Referring to FIG. 8 , FIG. 8 is a schematic flowchart of a method for unicast sending broadcast multicast data provided by Embodiment 3 of the present invention, as shown in FIG. 8, the method provided by the third embodiment of the present invention may include the following steps:

S301. The PGW receives the first session update request sent by the PCRF, and selects the EPS bearer of the designated UE for transmitting the broadcast service, where the first session update request is used to instruct the PGW to send the broadcast service in a unicast manner.

In the technical solution proposed by the embodiment of the present invention, the GCS application server initially initiates a unicast transmission broadcast service, and the GCS application server can send a unicast transmission request to the PCRF to request the network to send the broadcast service to the UE in a unicast manner. Or when the GCS application server wishes to send the broadcast service in a unicast manner, it can also send a unicast transmission request to the PCRF. As shown in Figure 3, the PCRF receives the unicast transmission request sent by the GCS application server, which may include the TMGI of the broadcast service or the TMGI and Flow ID of the broadcast service, the unicast transmission instruction, the BMSC identity that manages the broadcast service, and the specified UE's ID. Destination IP address and port number. The unicast transmission request may also include the unicast transmission range of the broadcast service to request the network to send the transmission range of the broadcast service; or include the unicast transmission range identifier to request the network to transmit within the coverage of the broadcast service or to request the network to transmit within the coverage of the broadcast service. The broadcast service is transmitted outside the coverage area. PCRF formulates PCC rules for broadcast services according to the unicast transmission request. For example, if the unicast transmission request includes the unicast transmission range, the PCRF can include the unicast transmission range as the broadcast service transmission policy in the PCC rules through the No. A session update request is sent to the PGW; if the unicast transmission request includes the unicast transmission range identifier, it is included in the PCC rule as the broadcast service transmission policy and sent to the PGW through the first session update request.

After the PGW receives the above-mentioned first session update request, it first selects the EPS bearer of the designated UE for sending the broadcast service, and the specific implementation can refer to step S101 in the above-mentioned embodiment, which is not repeated here.

S302 , the PGW sends a first broadcast service transmission request to the BMSC to obtain the IP multicast service address of the broadcast service, and binds the obtained IP multicast service address with the EPS bearer of the designated UE.

After the PGW selects the EPS bearer of the designated UE for transmitting the broadcast service, it obtains the IP multicast service address of the broadcast service and binds the obtained IP multicast service address with the EPS bearer of the designated UE. For the specific implementation of this step, reference may be made to step S102 in the first embodiment, which is not repeated here.

S303. The PGW determines the PRA corresponding to the location range for transmitting the broadcast service according to the broadcast service transmission policy in the PCC rule in the first session update request, and sends a subscription UE location change event request to the MME to request the MME to send a specified UE entry The event of the PRA and the event of the specified UE leaving the PRA.

After the PGW obtains the IP multicast service address of the broadcast service and binds the obtained IP multicast service address to the EPS bearer of the designated UE, it can determine the transmission according to the broadcast service transmission policy in the PCC rule in the first session update request. Broadcast the PRA corresponding to the location range of the service, and send a subscription UE location change event request to the MME to obtain the event that the UE enters the PRA and the event that the designated UE leaves the PRA, so that the PGW can enter or leave the UE according to the information sent by the MME. The event of the PRA determines whether the designated UE is located within the range of the location where the broadcast service is transmitted.

In a specific implementation, the broadcast service transmission policy may directly indicate the location range for transmitting the broadcast service, and may also indicate whether the location range for transmitting the broadcast service is the coverage area of the broadcast service. If the above broadcast service transmission policy directly indicates the location range for transmitting broadcast services, the PGW may directly determine the corresponding PRA according to the location range for transmitting broadcast services. If the above broadcast service transmission policy indicates whether the location range for transmitting broadcast services is the The PGW needs to obtain the coverage of the broadcast service from the BMSC, determine the location range for transmitting the broadcast service according to the coverage range of the broadcast service, and then determine the corresponding PRA according to the location range for transmitting the broadcast service. After the PGW determines the PRA corresponding to the location range for transmitting the broadcast service, it sends a subscription UE location change event request to the MME to request the MME to send an event specifying the UE entering the PRA and specifying the UE leaving the PRA.

The first session update request includes the signaling schematic diagram of the unicast transmission broadcast service when the broadcast service transmission strategy is included, and can refer to FIG. 9 or FIG. 10, wherein, FIG. 9 is a signaling schematic diagram of initially starting the unicast transmission broadcast service by the GCS. 10 is a schematic diagram of signaling for starting the unicast transmission broadcast service by the BMSC. As shown in Figure 9 or Figure 10, after the PGW binds the obtained IP multicast service address to the EPS bearer of the designated UE, it may directly send a request to the MME to subscribe to the UE location change event to request the MME to send the event that the designated UE enters the above-mentioned PRA and the event that the designated UE leaves the above-mentioned PRA; the PGW may also first send a subscription broadcast service coverage request to the BMSC, and the BMSC includes the broadcast service coverage in the subscription broadcast service coverage response and sends it to the PGW, and the PGW obtains the broadcast service coverage. Then, send a subscription UE location change event request to the MME.

In some feasible implementations, the PGW may include the above-mentioned subscription broadcast service coverage request in the first broadcast service transmission request sent by the PGW to the BMSC and send it to the BMSC, and the BMSC may also include the above-mentioned subscription broadcast service coverage response in the BMSC. The sent first broadcast service transmission response is sent to the PGW.

S304: The PGW sends a second broadcast service transmission request to the MBMS gateway to instruct the MBMS gateway to forward the broadcast service.

As shown in FIG. 9 or FIG. 10 , after the PGW sends a request for subscribing to the UE location change event to the MME, it sends a second broadcast service transmission request to the MBMS gateway to instruct the MBMS gateway to forward the broadcast service.

S305. The PGW determines whether the specified UE is located within the location range for transmitting the broadcast service according to the event that the UE enters or leaves the PRA sent by the MME. If the specified UE is located within the location range for transmitting the broadcast service, the broadcast service is transmitted through the EPS bearer of the specified UE.

After receiving the broadcast service forwarded by the MBMS gateway from the IP multicast service address, the PGW searches for the above-mentioned IP multicast service address according to the IP multicast service address of the received data (including address information such as IP address, port number and GTP TEID) The bound EPS bearer of the designated UE, and the PGW also needs to determine whether the designated UE is located within the range of the location for transmitting the broadcast service according to the event that the UE enters or leaves the PRA sent by the MME. Specifically, if the MME reports an event that the PGW specifies that the UE leaves the PRA corresponding to the location range for transmitting the broadcast service, the PGW determines that it is outside the location range for transmitting the broadcast service, and the broadcast service is not transmitted through the EPS bearer of the designated UE; If the MME reports the event that the PGW designated the UE to enter the PRA corresponding to the location range for transmitting the broadcast service, the PGW determines that it is within the location range for transmitting the broadcast service, and the PGW transmits the broadcast through the EPS bearer of the designated UE after receiving the broadcast service. business.

It can be seen that, in the technology proposed in the embodiment of the present invention, the PGW sends a subscription UE location change event request to the MME before sending the broadcast data, so as to request the MME to send an event specifying the PRA corresponding to the UE entering and leaving the location range for transmitting broadcast services; the PGW According to the event sent by the MME that the designated UE enters or leaves the above-mentioned PRA, it is determined whether the designated UE is located within the location range for transmitting broadcast services. If the designated UE is located within the location range for transmitting broadcast services, the broadcast service is transmitted through the EPS bearer of the designated UE. The technical solutions provided by the embodiments of the present invention can enable the PGW to automatically control to start or stop the unicast transmission of the broadcast service. There is no need for the GCS application server to trigger the process of starting or stopping the unicast transmission of the broadcast service every time the UE enters or leaves the location range for transmitting the broadcast service. Therefore, it can save a lot of GCS application server signaling and other related control signaling, reduce the signaling overhead of the communication network, and improve the efficiency of starting or stopping the unicast transmission of broadcast services, which meets the requirements of applications with high real-time requirements. Service quality requirements.

Embodiment 4 of the present invention provides a method for unicast sending broadcast multicast data. Referring to FIG. 11 , FIG. 11 is a schematic flowchart of a method for unicast sending broadcast multicast data provided by Embodiment 4 of the present invention, as shown in FIG. 11, the method provided by the fourth embodiment of the present invention may include the following steps:

S401. The BMSC receives the first broadcast service transmission request sent by the PGW after receiving the first session update request sent by the PCRF.

In the technical solution proposed by the embodiment of the present invention, the GCS application server initiates unicast transmission of the broadcast service to the designated UE initially. As shown in Figure 3, the PCRF receives the unicast transmission request sent by the GCS application server, which may include the TMGI of the broadcast service or the TMGI and Flow ID of the broadcast service, the unicast transmission instruction, the BMSC identity that manages the broadcast service, and the specified UE's ID. Destination IP address and port number. The PCRF formulates the PCC rule of the broadcast service according to the unicast transmission request, and sends a first session update request to the PGW to trigger the PGW to send the broadcast service to the designated UE through the EPS bearer. After receiving the first session update request sent by the PCRF, the PGW selects the EPS bearer of the designated UE for transmitting the broadcast service, and then obtains the IP multicast service address. The IP multicast service address is the destination address for the MBMS gateway to send broadcast services, and can be used to distinguish different broadcast services. It may include address information such as IP address, port number, and GPRS tunneling protocol GTP TEID. After the PGW binds the obtained IP multicast service address with the EPS bearer of the designated UE, it can find the EPS bearer of the designated UE through the IP multicast service address of the broadcast service, and send the broadcast service on the bearer. Since the IP multicast service address of the broadcast service is allocated by the MBMS gateway, the PGW may send the first broadcast service transmission request to the BMSC to trigger the BMSC to send the IP multicast service address request to the MBMS gateway.

S402, before the broadcast service session starts, the BMSC sends a session start request to the MBMS gateway to request the MBMS gateway to send the IP multicast service address of the broadcast service; or, during the broadcast service session, the BMSC sends a broadcast service address request to the MBMS gateway , to request the MBMS gateway to send the IP multicast service address of the broadcast service.

Before the broadcast service session starts, the BMSC sends a session start request to the MBMS gateway to request the MBMS gateway to send the IP multicast service address of the broadcast service. Figure 4 shows the signaling diagram of the BMSC initiating unicast transmission of the broadcast service. As shown in Figure 4, if the BMSC receives the first broadcast service transmission request sent by the PGW before the broadcast service session starts, the BMSC first records the PGW in the broadcast service information, and waits until the broadcast session starts to send the first broadcast service request to the MBMS gateway. A broadcast service address request indication is added to the session start request to request the MBMS gateway to start a broadcast service session and send the IP multicast service address of the broadcast service. In addition, when the broadcast service of unicast transmission ends and starts again, the BMSC can also obtain the IP multicast service address of the broadcast service from the MBMS gateway through a session start request. When the MBMS gateway receives the session start request, it allocates an IP multicast service address for the broadcast service and includes the IP multicast service address in the session start response and sends it to the BMSC.

During the broadcast service session, the signaling diagram of the GCS application server initiating unicast transmission of the broadcast service is shown in Figure 3. As shown in Figure 3, when the BMSC receives the first broadcast service transmission request sent by the PGW, the broadcast service session has been During the process, the BMSC records the PGW in the information of the broadcast service and immediately sends a broadcast service address request to the MBMS gateway to request the MBMS gateway to send the IP multicast service address of the broadcast service. After receiving the broadcast service address request, the MBMS gateway can include the IP multicast service address of the broadcast service in the broadcast service address response and send it to the BMSC.

S403: The BMSC forwards the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW, so that the PGW binds the IP multicast service address with the EPS bearer of the designated UE and transmits the broadcast service through the EPS bearer of the designated UE.

When the BMSC receives the IP multicast service address of the broadcast service sent by the MBMS gateway, it forwards it to the PGW. Specifically, as shown in Figure 3 or Figure 4, when the BMSC receives the broadcast service address response or session start response sent by the MBMS gateway, it obtains the IP multicast service address of the broadcast service from it, and passes the IP multicast service address through The broadcast service transmission response is sent to the above-mentioned PGW recorded in the MBMS information. The PGW may bind the IP multicast service address with the EPS bearer of the designated UE and transmit the broadcast service through the EPS bearer of the designated UE.

In some feasible implementation manners, the unicast transmission request sent by the GCS application server to the PCRF may further include the unicast transmission range of the broadcast service to request the network to send the transmission range of the broadcast service; In order to request the network to transmit the broadcast service within the coverage area of the broadcast service or to transmit the broadcast service outside the coverage area of the broadcast service. The PCC rule of the first session update request sent by the PCRF to the PGW may also include a broadcast service transmission policy, and the broadcast service transmission policy is used to indicate to the PGW the location area for unicast transmission of the broadcast service, so that the PGW can specify the location of the UE according to the location area. Determine whether to transmit the broadcast service in unicast mode. In specific implementation, the broadcast service transmission policy may directly indicate the location range for transmitting the broadcast service, or may indicate that the location range for transmitting the broadcast service is within the coverage area of the broadcast service or outside the coverage area of the broadcast service. If the above broadcast service transmission policy indicates whether the location range for transmitting the broadcast service is the coverage range of the broadcast service, the PGW needs to obtain the coverage range of the broadcast service from the BMSC to obtain the location range for transmitting the broadcast service. As shown in FIG. 9 or FIG. 10 , in which, FIG. 9 is a schematic diagram of signaling of initiating unicast transmission of the broadcast service by the GCS application server during the broadcast service session, and FIG. 10 is the unicast transmission initiated by the BMSC before the start of the broadcast service session. Schematic diagram of broadcast service signaling. After the PGW binds the obtained IP multicast service address to the EPS bearer of the designated UE, it may send a subscription broadcast service coverage request to the BMSC, and the BMSC includes the broadcast service coverage in the subscription broadcast service coverage. The range response is sent to the PGW.

In some feasible implementations, the PGW may include the above-mentioned subscription broadcast service coverage request in the first broadcast service transmission request sent by the PGW to the BMSC and send it to the BMSC, and the BMSC may also include the above-mentioned subscription broadcast service coverage response in the BMSC. The sent first broadcast service transmission response is sent to the PGW.

It can be seen that in the technical solution proposed in the embodiment of the invention, after receiving the first broadcast transmission request sent by the PGW, the BMSC requests the MBMS to broadcast the IP multicast service address of the broadcast service, and broadcasts the IP multicast service address of the broadcast service sent by the MBMS broadcast. The address is forwarded to the PGW, so that the PGW binds the IP multicast service address to the EPS bearer of the specified UE. When the PGW receives the broadcast service forwarded by the MBMS gateway, it can find the bound EPS of the specified UE according to the IP multicast service address. bearer, and transmit the broadcast service through the EPS bearer of the designated UE. The technical solution proposed by the embodiments of the present invention utilizes the MBMS gateway to forward the broadcast service to the PGW for unicast transmission, instead of using the GCS application server to send the broadcast service to the PGW, which makes full use of network equipment resources and reduces the cost of the GCS application server equipment. Communication pressure, thereby reducing the complexity and cost of developing GCS application server equipment. Further, before the broadcast service session starts, the BMSC can automatically initiate the unicast transmission of the broadcast service to the PGW according to the PGW information recorded in the broadcast service information, without the need to initiate the unicast transmission of the broadcast service by the GCS application server. Therefore, The control signaling of the GCS application server is reduced, and the efficiency of starting the unicast transmission of the broadcast service can also be improved.

Embodiment 5 of the present invention provides a method for unicast sending broadcast multicast data. Referring to FIG. 12 , FIG. 12 is a schematic flowchart of a method for unicast sending broadcast multicast data provided by Embodiment 5 of the present invention, as shown in FIG. 12, the method provided by the fifth embodiment of the present invention may include the following steps:

S501. When the broadcast service session ends, the BMSC sends a session end request to the MBMS gateway to request the MBMS gateway to end the broadcast service session.

When the broadcast service session ends, the BMSC can automatically initiate unicast transmission to end the broadcast service. Figure 7 shows a schematic diagram of the signaling flow that the BMSC initiates to stop the unicast transmission of the broadcast service when the broadcast service session ends. As shown in Figure 7, when the broadcast service session ends, the BMSC sends a session stop request to the MBMS gateway.

S502. When the BMSC receives the session end response sent by the MBMS gateway, it sends a broadcast service end indication to the PGW to instruct the PGW to stop transmitting the broadcast service.

After receiving the session stop response fed back by the MBMS gateway, the BMSC sends a broadcast service end indication to the PGW to instruct the PGW to stop sending the broadcast service in a unicast manner. In a specific implementation, because the BMSC can receive the first broadcast service transmission request sent by the PGW to record the information of the PGW when the PGW sends the broadcast service in a unicast manner, the BMSC can send the broadcast service end to all the PGWs recorded in the broadcast service information. The instruction is used to instruct the PGW to stop sending the above-mentioned broadcast service in a unicast manner. After the PGW receives the above broadcast service end indication, it will release all UE EPS bearers bound to the IP multicast service address of the broadcast service, and stop transmitting the above broadcast service through the UE's EPS bearer.

In some feasible implementations, when restarting the broadcast service session, the BMSC may re-send the broadcast service transmission response to all PGWs recorded in the broadcast service information, so that the PGW can re-assign the IP multicast service address of the broadcast service to the designated UE. The EPS bearer of the UE is bound and the broadcast service is transmitted through the EPS bearer of the designated UE. As shown in Figure 4, the BMSC sends a session start request to the MBMS gateway, which includes a broadcast service address request indication to request the MBMS gateway to start a broadcast service session and send an IP multicast service address. When the BMSC receives the session start response sent by the MBMS gateway Then, the IP multicast service address contained therein is sent to the PGW through the broadcast service transmission response.

In some feasible implementations, the GCS application server can trigger the stop of the unicast transmission of the broadcast service, and the schematic diagram of the signaling of the stop of the unicast transmission of the broadcast service initiated by the GCS application server can be seen in Figure 6. As shown in Figure 6, when the PGW receives After the second session update request sent by the PCRF, the IP multicast service address of the broadcast service is unbound with the EPS bearer of the designated UE, and the first broadcast service stop request is sent to the BMSC to indicate to the BMSC that the PGW has stopped transmitting the broadcast business. When the BMSC receives the above-mentioned first broadcast service stop transmission request, it deletes the PGW information in the broadcast service information.

It can be seen that in the technical solution proposed by the embodiment of the present invention, when the broadcast service session ends, the BMSC automatically initiates unicast transmission to end the broadcast service, and sends a broadcast service end indication to the PGW recorded in the broadcast service information to instruct the PGW to stop transmission. The broadcast service does not need to be initiated by the GCS application server to end the unicast transmission of the broadcast service. Therefore, the control signaling of the GCS application server is reduced, and the efficiency of stopping the unicast transmission of the broadcast service can be improved.

Embodiment 6 of the present invention provides a method for unicast sending broadcast multicast data. Referring to FIG. 13 , FIG. 13 is a schematic flowchart of a method for unicast sending broadcast multicast data according to Embodiment 6 of the present invention, as shown in FIG. 13, the method may include the following steps:

S601. When the broadcast service session starts, the MBMS gateway receives the session start request sent by the BMSC, or, after the broadcast service session starts, the MBMS gateway receives the broadcast service address request sent by the BMSC, wherein the session start request and the broadcast service address request are IP multicast service address used to obtain broadcast services.

When the PGW triggers unicast transmission of the broadcast service according to the first session update request sent by the PCRF, the EPS bearer of the designated UE is selected for transmitting the broadcast service, and then the IP multicast service address is obtained. Since the IP multicast service address is allocated by the MBMS gateway, the PGW sends the first broadcast service transmission request to the BMSC to trigger the BMSC to send the IP multicast service address request to the MBMS gateway.

When the broadcast service session starts, the MBMS gateway can receive the session start request sent by the BMSC, which includes the broadcast service address request indication. As shown in Figure 4, when the BMSC receives the first broadcast service sent by the PGW before the broadcast service session starts transmission request, the BMSC first records the PGW in the information of the broadcast service, and adds a broadcast service address request indication to the session start request sent to the MBMS gateway when the broadcast session starts, so as to request the MBMS gateway to start the broadcast service session and send the broadcast service IP multicast service address of the business. In addition, when the broadcast service of unicast transmission ends and starts again, the BMSC can also obtain the IP multicast service address of the broadcast service from the MBMS gateway through a session start request.

The MBMS gateway may also receive the broadcast service address request sent by the BMSC during the broadcast service session. As shown in Figure 3, when the BMSC receives the first broadcast service transmission request sent by the PGW, the broadcast service session is already in progress. The PGW records the broadcast service information and immediately sends a broadcast service address request to the MBMS gateway to request the MBMS gateway to send the IP multicast service address of the broadcast service.

S602: The MBMS gateway sends the IP multicast service address of the broadcast service to the BMSC, so that the BMSC forwards the IP multicast service address of the broadcast service to the PGW.

When the MBMS gateway receives the session start request carrying the broadcast service address request indication sent by the BMSC, it allocates an IP multicast service address for the broadcast service and includes the IP multicast service address in the session start response and sends it to the BMSC; or when the MBMS gateway After receiving the broadcast service address request sent by the BMSC, the gateway includes the IP multicast service address of the broadcast service in the broadcast service address response and sends it to the BMSC. After receiving the IP multicast service address of the broadcast service, the BMSC forwards it to the PGW.

S603: After receiving the second broadcast service transmission request sent by the PGW, the MBMS gateway sends the broadcast service to the PGW through the IP multicast service address of the broadcast service, so that the PGW transmits the broadcast service through the EPS bearer of the designated UE.

As shown in Figure 3 or Figure 4, after the PGW binds the IP multicast service address of the broadcast service to the EPS bearer of the designated UE, it sends a second broadcast service transmission request to the MBMS gateway to instruct the MBMS gateway to forward the broadcast service to PGW. After receiving the second broadcast service transmission request, the MBMS gateway records the PGW in the broadcast service information, and forwards the broadcast service to the PGW when the MBMS receives the broadcast service data. In the specific implementation, a logical transmission channel can be established between the MBMS gateway and the PGW. After the MBMS gateway receives the data of the broadcast service, it sends the broadcast service data to the E-UTRAN and the PGW through the IP multicast service address of the broadcast service. So that the E-UTRAN transmits the broadcast service in the broadcast multicast bearer, and the PGW transmits the broadcast service in the EPS bearer.

In some feasible implementations, when the GCS application server triggers to stop unicast transmission of the broadcast service and the PGW does not send the above broadcast service through EPS to all UEs in the PGW, or when the broadcast service session ends, the MBMS gateway can receive the PGW The sent second broadcast service stop transmission request is used to instruct the MBMS gateway to stop forwarding the broadcast service. As shown in FIG. 6 , after receiving the request for stopping transmission of the second broadcast service, the MBMS gateway deletes the above-mentioned PGW information recorded in the broadcast service information. When the MBMS receives the broadcast service data, it stops forwarding the broadcast service to the above-mentioned PGW.

It can be seen that in the technical solution proposed in the embodiment of the present invention, after receiving the request, the MBMS sends the IP multicast service address of the broadcast service to the BMSC, so that the BMSC forwards it to the PGW, and then receives the second broadcast service transmission request sent by the PGW. Then, the broadcast service is sent to the PGW through the IP multicast service address of the broadcast service, so that the PGW transmits the broadcast service through the EPS bearer of the designated UE. Because MBMS broadcast originally needs to copy the broadcast data into multiple copies and distribute them to multiple E-UTRANs, and sending more copies to the PGW will not put pressure on the MBMS gateway, so that the MBMS gateway with higher performance can be used to forward the broadcast. The service data is sent to the PGW instead of using the GCS application server to send the broadcast service to the PGW, which reduces the performance requirements for the GCS application server equipment and reduces the cost of designing and developing the GCS application server.

Embodiment 7 of the present invention provides a packet data gateway, which is used to implement the method for unicast sending broadcast multicast data proposed by the present invention. Referring to FIG. 14 , the packet data gateway 700 may include a receiving unit 710 , a processing unit 720 , an obtaining unit 730 and a sending unit 740 .

A receiving unit 710, configured to receive a first session update request sent by the PCRF, where the first session update request is used to instruct the PGW to transmit the broadcast service in a unicast manner;

a processing unit 720, configured to select, according to the first session update request received by the receiving unit 710, the EPS bearer of the designated UE used for transmitting the broadcast service;

Obtaining unit 730, for sending the first broadcast service transmission request to the BMSC to obtain the IP multicast service address of the broadcast service;

A sending unit 740, configured to send a second broadcast service transmission request to the MBMS gateway to instruct the MBMS gateway to send the broadcast service;

The processing unit 720 is further configured to search for the bound EPS bearer of the specified UE according to the IP multicast service address of the broadcast service sent by the MBMS gateway, and transmit the broadcast service through the EPS bearer of the specified UE.

In a specific implementation, the first session request includes the PCC rule of the broadcast service, wherein the PCC rule includes the TMGI of the broadcast service or the TMGI and Flow ID of the broadcast service, the destination IP address and port number of the specified UE, and the QoS of the broadcast service. BMSC identity that requires and manages broadcast services.

The processing unit 720 is specifically configured to obtain the PCC rule in the first session update request received by the receiving unit 710, and determine the designated UE according to the destination IP address of the designated UE in the PCC rule; The established EPS bearer of the designated UE is used to transmit the broadcast service; or, a new EPS bearer of the designated UE is established to transmit the broadcast service; and the purpose of sending the broadcast service to the designated UE in the PCC rules through the EPS bearer of the designated UE IP address and port number.

The obtaining unit 730 is specifically used to send the first broadcast service transmission request to the BMSC, to trigger the BMSC to obtain the IP multicast service address of the broadcast service from the MBMS gateway; and receive the broadcast service transmission response sent by the BMSC, and obtain the broadcast service transmission response in the The IP multicast service address of the included broadcast service.

In some feasible implementation manners, the receiving unit 710 is further configured to receive a second session update request sent by the PCRF, where the second session update request is used to instruct the PGW to stop transmitting the broadcast service in a unicast manner. The processing unit 720 is further configured to release the binding between the IP multicast service address of the broadcast service and the EPS bearer of the designated UE, and stop transmitting the broadcast service through the EPS bearer of the designated UE. The sending unit 740 is further configured to send a first broadcast service stop transmission request to the BMSC to indicate to the BMSC that the PGW has stopped transmitting the broadcast service; and send a second broadcast service stop transmission request to the MBMS gateway to instruct the MBMS gateway to stop forwarding the broadcast to the PGW business.

In some feasible implementation manners, the receiving unit 710 is further configured to receive the broadcast service end indication sent by the BMSC when the broadcast service session ends. The processing unit 720 is further configured to release the binding of the IP multicast service address of the broadcast service and the EPS bearer of the designated UE, and stop transmitting the broadcast service through the EPS bearer of the designated UE.

In some feasible implementation manners, the PCC rule of the broadcast service includes a broadcast service transmission policy, and the broadcast service transmission policy is used to indicate the location range for transmitting the broadcast service or to indicate whether the location range for transmitting the broadcast service is the coverage area of the broadcast service . The processing unit 720 is further configured to determine, according to the broadcast service transmission policy, a location reporting area PRA corresponding to the location range for transmitting the broadcast service. The device 700 further includes a subscribing unit 750 for sending a subscription UE location change event request to the MME, so as to request the MME to send an event specifying that the UE enters the PRA and an event specifying that the UE leaves the PRA. The processing unit 720 is further configured to determine whether the specified UE is located within the range of the location for transmitting broadcast services according to the event that the UE enters or leaves the PRA sent by the MME, and if the specified UE is located within the range of the location for transmitting the broadcast service, transmit the data through the EPS bearer of the specified UE. broadcasting business. If the receiving unit 710 receives the second session update request sent by the RCRF, or the receiving unit 710 receives the broadcast broadcast service end indication sent by the BMSC, the subscribing unit 750 sends the MME a request to stop subscribing to the UE location change event to request the MME to stop sending the specified The event of the UE entering the PRA and the event of the specified UE leaving the PRA.

The technical solution proposed by the embodiment of the present invention utilizes the MBMS gateway with higher performance to forward the broadcast service to the PGW for unicast transmission in realizing the unicast transmission of broadcast data, instead of using the GCS application server to send the broadcast service to the PGW, The PGW can find the EPS bearer of the designated UE according to the IP multicast service address of the broadcast service sent by the MBMS gateway, and send the broadcast service through the EPS bearer of the designated UE, thus making full use of the network equipment resources and reducing the communication pressure on the GCS application server equipment , thereby reducing the complexity and cost of developing GCS application server equipment.

The eighth embodiment of the present invention provides a multicast broadcast service center device, which is used to implement a method for unicast sending broadcast multicast data proposed by the present invention. Referring to FIG. 15 , the multicast broadcast service center device 800 may include a receiving unit 810 and a sending unit 820 .

A receiving unit 810, configured to receive a first broadcast service transmission request sent by the PGW, where the first broadcast service transmission request is used to request to forward the IP multicast service address of the broadcast service;

The sending unit 820 is configured to send a session start request to the MBMS gateway before the broadcast service session starts, so as to request the MBMS gateway to send the IP multicast service address of the broadcast service; or, during the broadcast service session, send the broadcast service to the MBMS gateway Address request, to request the MBMS gateway to send the IP multicast service address of the broadcast service;

The sending unit 820 is further configured to forward the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW, so that the PGW binds the IP multicast service address with the EPS bearer of the designated UE and transmits the broadcast service through the EPS bearer of the designated UE. .

In a specific implementation, the receiving unit is further configured to receive a session start response or a broadcast service address response sent by the MBMS gateway. The sending unit 820 is specifically configured to forward the IP multicast service address of the broadcast service in the session start response or the broadcast service address response through the broadcast service transmission response when the receiving unit 810 receives the session start response or the broadcast service address response sent by the MBMS gateway. to PGW.

In some feasible implementation manners, the receiving unit 810 is further configured to receive a first broadcast service stop transmission request sent by the PGW, where the first broadcast service stop transmission request is used to indicate that the PGW has stopped transmitting the broadcast service.

In some feasible implementation manners, the sending unit 820 is further configured to send a session end request to the MBMS gateway when the broadcast service session ends, so as to request the MBMS gateway to end the broadcast service session. The receiving unit 810 is further configured to receive a session end response sent by the MBMS gateway. The sending unit 820 is further configured to send a broadcast service end indication to the PGW when the receiving unit 810 receives the session end response sent by the MBMS gateway, so as to instruct the PGW to stop transmitting the broadcast service.

In some other feasible implementation manners, the receiving unit 810 is further configured to receive a broadcast service coverage subscription request sent by the PGW after receiving the PCC rule of the broadcast service sent by the PCRF. The sending unit 820 is further configured to send the coverage of the broadcast service to the PGW, so that the PGW obtains the location range for transmitting the broadcast service according to the coverage of the broadcast service.

The technical solution proposed by the embodiments of the present invention utilizes the MBMS gateway to forward the broadcast service to the PGW for unicast transmission, instead of using the GCS application server to send the broadcast service to the PGW, which makes full use of network equipment resources and reduces the cost of the GCS application server equipment. Communication pressure, thereby reducing the complexity and cost of developing GCS application server equipment. Further, before the broadcast service session starts, the BMSC can automatically initiate the unicast transmission of the broadcast service to the PGW according to the PGW information recorded in the broadcast service information, without the need to initiate the unicast transmission of the broadcast service by the GCS application server. Therefore, The control signaling of the GCS application server is reduced, and the efficiency of starting the unicast transmission of the broadcast service can also be improved.

The ninth embodiment of the present invention provides a multimedia broadcast multicast service gateway, which is used to implement a method for unicast sending broadcast multicast data proposed by the present invention. Referring to FIG. 16 , the MBMS gateway 900 may include a receiving unit 910 and a sending unit 920 .

The receiving unit 910 is configured to receive the session start request sent by the BMSC when the broadcast service session starts, or, after the broadcast service session starts, receive the broadcast service address request sent by the BMSC, wherein the session start request and the broadcast service address request are used. To obtain the IP multicast service address of the broadcast service;

The sending unit 920 is used to send the IP multicast service address of the broadcast service to the BMSC, so that the BMSC forwards the IP multicast service address of the broadcast service to the PGW;

The receiving unit 910 is further configured to receive the second broadcast service transmission request sent by the PGW;

The sending unit 920 is further configured to send the broadcast service to the PGW through the IP multicast service address of the broadcast service after the receiving unit 910 receives the second broadcast service transmission request sent by the PGW, so that the PGW transmits the broadcast service through the EPS bearer of the designated UE. business.

In a specific implementation, the sending unit 920 is configured to send the session start response by sending the session start response, or send the IP multicast service address of the broadcast service to the BMSC by sending the broadcast service address response.

In some feasible implementation manners, the receiving unit 910 is further configured to receive a second broadcast service stop transmission request sent by the PGW. The sending unit 920 is further configured to stop sending the broadcast service to the PGW after the receiving unit 910 receives the second broadcast service stop transmission request sent by the PGW.

It can be seen that the technical solution proposed in the embodiment of the present invention can use the MBMS gateway with higher performance to forward the broadcast service data to the PGW, instead of using the GCS application server to send the broadcast service to the PGW, which reduces the performance requirements for the GCS application server equipment. , reducing the cost of designing and developing GCS application servers.

The tenth embodiment of the present invention provides another packet data gateway, which is used to implement the method for unicast sending broadcast multicast data proposed by the present invention. 17, the device a00 includes a processor a10, a memory a20, a bus system a30, a receiver a40, and a transmitter a50. The processor a10, the memory a20, the receiver a40 and the transmitter a50 are connected through the bus system a30, the memory a20 is used to store instructions, and the processor a10 is used to execute the instructions stored in the memory a20 to control the receiver a40 to receive signal, and control the transmitter a50 to send the signal, so as to complete the steps in the above method for unicast sending broadcast multicast data. The receiver a40 and the transmitter a50 may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as transceivers.

The method steps performed by the device a00 may at least include:

Receive the first session update request sent by the PCRF, and select the EPS bearer of the designated UE for transmitting the broadcast service, wherein the first session update request is used to instruct the PGW to transmit the broadcast service in a unicast manner;

Send the first broadcast service transmission request to the BMSC to obtain the IP multicast service address of the broadcast service, and bind the obtained IP multicast service address with the EPS bearer of the designated UE;

sending a second broadcast service transmission request to the MBMS gateway to instruct the MBMS gateway to send the broadcast service;

Search the bound EPS bearer of the designated UE according to the IP multicast service address of the broadcast service forwarded by the MBMS gateway, and transmit the broadcast service through the EPS bearer of the designated UE.

For the concepts related to the technical solutions provided by the embodiments of the present invention involved in the packet data gateway, please refer to the descriptions of the foregoing methods or embodiments for explanations, detailed descriptions, and other steps, which will not be repeated here.

The eleventh embodiment of the present invention provides another multicast broadcast service center device, which is used to implement the method for unicast sending broadcast multicast data proposed by the present invention. Referring to FIG. 18, the device b00 includes a processor b10, a memory b20, a bus system b30, a receiver b40 and a transmitter b50. The processor b10, the memory b20, the receiver b40 and the transmitter b50 are connected through the bus system b30, the memory b20 is used to store instructions, and the processor b10 is used to execute the instructions stored in the memory b20 to control the receiver b40 to receive signal, and control the transmitter b50 to send the signal, so as to complete the steps in the above method for unicast sending broadcast multicast data. The receiver b40 and the transmitter b50 may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as transceivers.

The method steps completed by the device b00 may at least include:

The receiving PGW receives the first broadcast service transmission request sent by the PCRF, and the first broadcast service transmission request is used for requesting to forward the IP multicast service address of the broadcast service;

Before the broadcast service session starts, a session start request is sent to the MBMS gateway to request the MBMS gateway to send the IP multicast service address of the broadcast service; or, during the broadcast service session, a broadcast service address request is sent to the MBMS gateway to request the MBMS The IP multicast service address for the gateway to send broadcast services;

Forward the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW, so that the PGW binds the IP multicast service address with the EPS bearer of the designated UE and transmits the broadcast service through the EPS bearer of the designated UE.

For the concepts related to the technical solutions provided by the embodiments of the present invention involved in the above-mentioned multicast broadcast service center equipment, please refer to the descriptions of the foregoing methods or embodiments for explanations, detailed descriptions, and other steps, and will not be repeated here.

The twelfth embodiment of the present invention provides another broadcast multicast service gateway, which is used to implement the method for unicast sending broadcast multicast data proposed by the present invention. Referring to FIG. 19, the device c00 includes a processor c10, a memory c20, a bus system c30, a receiver c40 and a transmitter c50. The processor c10, the memory c20, the receiver c40 and the transmitter c50 are connected through the bus system c30, the memory c20 is used for storing instructions, and the processor c10 is used for executing the instructions stored in the memory c20 to control the receiver c40 to receive signal, and control the transmitter c50 to send the signal, so as to complete the steps in the above method for unicast sending broadcast multicast data. The receiver c40 and the transmitter c50 may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as transceivers.

The method steps completed by the device c00 may at least include:

When the broadcast service session starts, the session start request sent by the BMSC is received, or, after the broadcast service session starts, the broadcast service address request sent by the BMSC is received, wherein the session start request and the broadcast service address request are used to obtain the IP address of the broadcast service. multicast service address;

Send the IP multicast service address of the broadcast service to the BMSC, so that the BMSC forwards the IP multicast service address of the broadcast service to the PGW;

After receiving the second broadcast service transmission request sent by the PGW, the broadcast service is sent to the PGW through the IP multicast service address of the broadcast service, so that the PGW transmits the broadcast service through the EPS bearer of the designated UE.

For the concepts related to the technical solutions provided by the embodiments of the present invention involved in the above broadcast multicast service gateway, please refer to the descriptions of the foregoing methods or embodiments for explanations, detailed descriptions, and other steps, which are not repeated here.

The thirteenth embodiment of the present invention provides a communication system for unicast sending broadcast multicast data. Referring to FIG. 20, FIG. 20 is a structure of the communication system for unicast sending broadcast multicast data according to the thirteenth embodiment of the present invention. Schematic diagram, as shown in FIG. 20, the communication system includes: a packet data gateway d10, a multicast broadcast service center device d20 and a multimedia broadcast and multicast service gateway d30, wherein the packet data gateway d10 and the multicast broadcast service center device d20 They communicate through the Gr interface, the packet data gateway d10 and the multimedia broadcast and multicast service gateway d30 communicate through the M5 interface, and the multicast broadcast service center device d20 and the multimedia broadcast and multicast service gateway d30 communicate through the SGi interface.

The packet data gateway d10 is the packet data gateway provided by the above embodiments of the invention for implementing a method for unicast sending broadcast multicast data of the present invention;

The multicast broadcast service center device d20 is the multicast broadcast service center device provided by the above embodiments of the invention for implementing a method for unicast sending broadcast multicast data of the present invention;

The multimedia broadcast and multicast service gateway d30 is the multimedia broadcast and multicast service gateway provided by the above embodiments of the invention and used to implement a method for unicast sending of broadcast and multicast data of the present invention.

In some feasible implementation manners, the above communication system may further include a mobility management entity device d40, and FIG. 21 is a schematic structural diagram of a communication system including a mobility management entity device for unicast transmission of broadcast multicast data. The S-11 interface is used for communication between the mobility management entity device d40 and the packet data gateway d10. The mobility management entity device d40 is configured to receive the subscribed UE location change event request sent by the packet data gateway d10, and send the UE entering or leaving the specified PRA event to the packet data gateway d10 according to the subscribed UE location change event request.

As will be appreciated by one of ordinary skill in the art, various aspects of the present invention, or possible implementations of various aspects, may be embodied as a system, method or computer program product. Furthermore, aspects of the present invention, or possible implementations of various aspects, may take the form of a computer program product, which refers to computer readable program code stored on a computer readable medium.

The computer-readable medium may be a computer-readable data medium or a computer-readable storage medium. Computer-readable storage media include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or devices, or any suitable combination of the foregoing, such as random access memory (RAM), read only memory (ROM), memory Erase programmable read only memory (EPROM or flash memory), optical fiber, portable read only memory (CD-ROM).

The processor in the computer reads the computer-readable program code stored in the computer-readable medium, so that the processor can perform the functional actions specified in each step or combination of steps in the flowchart; A device that operates the functions specified in each block, or a combination of blocks.

The computer readable program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's local computer and partly on a remote computer, or entirely on the remote computer or server implement. It should also be noted that, in some alternative implementations, the functions noted in the steps in the flowcharts, or blocks in the block diagrams, may occur out of the order noted in the figures. For example, two steps, or two blocks shown in succession, may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative, and the division of the functional units is only a logical function division. There may be other division methods during specific implementation, for example, multiple units may be combined into the same subsystem Or implemented in a module, or split a unit into several units for implementation, or some implementation features can be ignored or not implemented.

A method, device, and system for unicast sending broadcast-multicast data disclosed in the embodiments of the present invention have been described above in detail. Specific examples are used in this paper to illustrate the principles and implementations of the present invention. It is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific embodiments and application scope. In summary, The contents of this specification should not be construed as limiting the present invention.

Claims (45)

1. a method for unicast transmission of broadcast multicast data, used in packet data gateway, is characterized in that, comprising: The packet data gateway PGW receives the first session update request sent by the policy and charging rules function PCRF, and selects the Evolved Packet System EPS bearer of the designated user equipment UE for transmitting the broadcast service, wherein the first session update request is used for instructing the PGW to transmit the broadcast service in a unicast manner; The PGW sends a first broadcast service transmission request to the broadcast multicast service center BMSC to obtain the IP multicast service address of the broadcast service, and associates the obtained IP multicast service address with the EPS bearer of the designated UE. bind; sending, by the PGW, a second broadcast service transmission request to a broadcast multicast service MBMS gateway, to instruct the MBMS gateway to send the broadcast service; The PGW searches for the bound EPS bearer of the designated UE according to the IP multicast service address of the broadcast service forwarded by the MBMS gateway, and transmits the broadcast service through the EPS bearer of the designated UE. 2. The method according to claim 1, wherein the first session request includes a policy and a charging control PCC rule of the broadcast service, wherein the PCC rule includes a temporary Mobility group identity TMGI or TMGI of the broadcast service and flow identity Flow ID, destination IP address and port number of the designated UE, quality of service QoS requirements of the broadcast service and BMSC identity for managing the broadcast service. 3. The method according to claim 2, wherein the PGW receives the first session update request sent by the PCRF, and selects the EPS bearer of the designated UE for transmitting the broadcast service, comprising: The PGW receives the first session update request sent by the PCRF, obtains the PCC rule in the first session update request, and determines the designated UE according to the destination IP address of the designated UE in the PCC rule; The PGW selects the established EPS bearer of the designated UE for transmitting the broadcast service according to the QoS requirements of the broadcast service in the PCC rule; or, establishes a new EPS bearer of the designated UE for transmitting all the broadcast services. the broadcasting service; The PGW transmits the broadcast service through the EPS bearer of the designated UE, including: The broadcast service is sent to the destination IP address and port number of the designated UE in the PCC rule through the EPS bearer of the designated UE. 4. The method according to claim 1, wherein the PGW sends a first broadcast service transmission request to the BMSC to obtain the IP multicast service address of the broadcast service, comprising: The PGW sends a first broadcast service transmission request to the BMSC to trigger the BMSC to acquire the IP multicast service address of the broadcast service from the MBMS gateway; The PGW receives the broadcast service transmission response sent by the BMSC, and acquires the IP multicast service address of the broadcast service included in the broadcast service transmission response. 5. The method according to claim 3, wherein the PGW sends a first broadcast service transmission request to the BMSC to obtain the IP multicast service address of the broadcast service, comprising: The PGW sends a first broadcast service transmission request to the BMSC to trigger the BMSC to acquire the IP multicast service address of the broadcast service from the MBMS gateway; The PGW receives the broadcast service transmission response sent by the BMSC, and acquires the IP multicast service address of the broadcast service included in the broadcast service transmission response. 6. The method according to claim 3, wherein the PGW sends a first broadcast service transmission request to the BMSC to obtain the IP multicast service address of the broadcast service, comprising: The PGW sends a first broadcast service transmission request to the BMSC to trigger the BMSC to acquire the IP multicast service address of the broadcast service from the MBMS gateway; The PGW receives the broadcast service transmission response sent by the BMSC, and acquires the IP multicast service address of the broadcast service included in the broadcast service transmission response. 7. The method according to any one of claims 1 to 6, wherein after the step of transmitting the broadcast service by the PGW through the EPS bearer of the designated UE, the method further comprises: receiving, by the PGW, a second session update request sent by the PCRF, where the second session update request is used to instruct the PGW to stop transmitting the broadcast service in a unicast manner; The PGW releases the binding of the IP multicast service address of the broadcast service with the EPS bearer of the designated UE, and stops transmitting the broadcast service through the EPS bearer of the designated UE; sending, by the PGW, a first broadcast service stop transmission request to the BMSC to indicate to the BMSC that the PGW has stopped transmitting the broadcast service; The PGW sends a second broadcast service stop transmission request to the MBMS gateway to instruct the MBMS gateway to stop forwarding the broadcast service to the PGW. 8. The method according to any one of claims 1 to 6, characterized in that, After the step of transmitting the broadcast service by the PGW through the EPS bearer of the designated UE, the method further includes: When the broadcast service session ends, the PGW receives the broadcast service end indication sent by the BMSC; The PGW releases the binding of the IP multicast service address of the broadcast service and the EPS bearer of the designated UE, and stops transmitting the broadcast service through the EPS bearer of the designated UE. 9. A method for unicast transmission of broadcast multicast data, characterized in that, The method for unicast sending broadcast multicast data has all the features of the method according to any one of claims 1 to 8, and, The PCC rule of the broadcast service includes a broadcast service transmission policy, wherein the broadcast service transmission policy is used to indicate the location range for transmitting the broadcast service or for indicating whether the location range for the broadcast service transmission is within the range of the broadcast service. coverage; After the PGW sends a first broadcast service transmission request to the BMSC to obtain the IP multicast service address of the broadcast service, and binds the obtained IP multicast service address to the EPS bearer of the designated UE , the method also includes: The PGW determines, according to the broadcast service transmission policy in the PCC rule in the first session update request, the location reporting area PRA corresponding to the location range for transmitting the broadcast service, and sends a subscription UE location change event request to the mobility management entity MME , to request the MME to send the event that the designated UE enters the PRA and the event that the designated UE leaves the PRA; The PGW transmits the broadcast service through the EPS bearer of the designated UE, including: The PGW judges whether the designated UE is located within the location range of the broadcast service transmission according to the event that the UE enters or leaves the PRA sent by the MME, if the designated UE is located within the location range of the broadcast service transmission , the broadcast service is transmitted through the EPS bearer of the designated UE. 10. The method according to claim 9, wherein the PGW determines the PRA corresponding to the location range of the broadcast service according to the broadcast service transmission policy in the PCC rule in the first session update request, comprising: If the broadcast service transmission policy in the PCC rule in the first session update request is used to indicate whether the location range for transmitting the broadcast service is the coverage of the broadcast service, the PGW sends a subscription broadcast to the BMSC Service coverage request, to request the BMSC to send the coverage of the broadcast service; The PGW determines the location range of the broadcast service transmission according to the coverage range of the broadcast service sent by the BMSC, and forms a PRA corresponding to the location range of the broadcast service transmission. 11. The method according to claim 9 or 10, wherein after the PGW sends a request to subscribe to a UE location change event to the MME, the method further comprises: If the PGW receives the second session update request sent by the PCRF, or if the PGW receives the broadcast service end indication sent by the BMSC, the PGW sends a request to stop subscribing to the UE location change event to the MME to The MME is requested to stop sending the event that the designated UE enters the PRA and the event that the designated UE leaves the PRA. 12. A method for unicast sending broadcast multicast data, for use in a multicast broadcast service center, characterized in that, comprising: The multicast broadcast service center BMSC receives the first broadcast service transmission request sent by the packet data gateway PGW, where the first broadcast service transmission request is used for requesting to forward the IP multicast service address of the broadcast service; Before the broadcast service session starts, the BMSC sends a session start request to the MBMS gateway to request the MBMS gateway to send the IP multicast service address of the broadcast service; or when the broadcast service session is in progress, the The BMSC sends a broadcast service address request to the MBMS gateway to request the MBMS gateway to send the IP multicast service address of the broadcast service; The BMSC forwards the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW, so that the PGW binds the IP multicast service address to the EPS bearer of the designated user equipment UE and passes the IP multicast service address to the specified user equipment UE. The EPS bearer of the designated UE transmits the broadcast service. 13. The method according to claim 12, wherein the step of the BMSC forwarding the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW comprises: When the BMSC receives the session start response sent by the MBMS gateway, or when the BMSC receives the broadcast service address response sent by the MBMS gateway, the session start response or the broadcast service address response is included in the session start response or the broadcast service address response. The IP multicast service address of the broadcast service is forwarded to the PGW through the broadcast service transmission response. 14. The method according to claim 12, wherein after the BMSC forwards the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW, the method further comprises: The BMSC receives a first broadcast service stop transmission request sent by the PGW, where the first broadcast service stop transmission request is used to indicate that the PGW has stopped transmitting the broadcast service. 15. The method according to claim 13, wherein after the BMSC forwards the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW, the method further comprises: The BMSC receives a first broadcast service stop transmission request sent by the PGW, where the first broadcast service stop transmission request is used to indicate that the PGW has stopped transmitting the broadcast service. 16. The method according to claim 12, wherein after the BMSC forwards the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW, the method further comprises: When the broadcast service session ends, the BMSC sends a session end request to the MBMS gateway to request the MBMS gateway to end the broadcast service session; When the BMSC receives the session end response sent by the MBMS gateway, it sends a broadcast service end indication to the PGW to instruct the PGW to stop transmitting the broadcast service. 17. The method according to claim 13, wherein after the BMSC forwards the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW, the method further comprises: When the broadcast service session ends, the BMSC sends a session end request to the MBMS gateway to request the MBMS gateway to end the broadcast service session; When the BMSC receives the session end response sent by the MBMS gateway, it sends a broadcast service end indication to the PGW to instruct the PGW to stop transmitting the broadcast service. 18. The method according to any one of claims 12 to 17, wherein after the BMSC receives the step of the first broadcast service transmission request sent by the PGW after receiving the PCC rule of the broadcast service sent by the PCRF , the method also includes: The BMSC receives the subscription broadcast service coverage request sent by the PGW after receiving the PCC rule of the broadcast service sent by the PCRF; The BMSC sends the coverage of the broadcast service to the PGW, so that the PGW obtains a location range for transmitting the broadcast service according to the coverage of the broadcast service. 19. A method for unicast transmission of broadcast multicast data, used in a multimedia broadcast multicast service gateway, is characterized in that, comprising: When the broadcast service session starts, the MBMS gateway receives the session start request sent by the multicast broadcast service center BMSC, or, after the broadcast service session starts, the MBMS gateway receives the broadcast service address request sent by the BMSC, wherein, The session start request and the broadcast service address request are used to obtain the IP multicast service address of the broadcast service; The MBMS gateway sends the IP multicast service address of the broadcast service to the BMSC, so that the BMSC forwards the IP multicast service address of the broadcast service to the packet data gateway PGW; After receiving the second broadcast service transmission request sent by the PGW, the MBMS gateway sends the broadcast service to the PGW through the IP multicast service address of the broadcast service, so that the PGW can pass the specified UE's IP multicast service address. The EPS bearer transmits the broadcast service. 20. The method according to claim 19, wherein the MBMS gateway sends the IP multicast service address of the broadcast service to the BMSC, comprising: The MBMS gateway sends the IP multicast service address of the broadcast service to the BMSC by sending a session start response, or by sending a broadcast service address response. 21. The method according to claim 19 or 20, wherein after the receiving the second broadcast service transmission request sent by the PGW, the method further comprises: After receiving the request for stopping transmission of the second broadcast service sent by the PGW, the MBMS gateway stops sending the broadcast service to the PGW. 22. A packet data gateway, comprising: a receiving unit, configured to receive a first session update request sent by the policy and charging rule function PCRF, where the first session update request is used to instruct the PGW to transmit the broadcast service in a unicast manner; a processing unit, configured to select, according to the first session update request received by the receiving unit, an Evolved Packet System (EPS) bearer of the designated user equipment UE for transmitting the broadcast service; an obtaining unit, configured to send a first broadcast service transmission request to the broadcast multicast service center BMSC to obtain the IP multicast service address of the broadcast service; a sending unit, configured to send a second broadcast service transmission request to a broadcast multicast service MBMS gateway to instruct the MBMS gateway to send the broadcast service; The processing unit is further configured to search for the bound EPS bearer of the specified UE according to the IP multicast service address of the broadcast service forwarded by the MBMS gateway, and transmit the EPS bearer of the specified UE through the EPS bearer of the specified UE. the broadcasting service. 23. The packet data gateway according to claim 22, wherein the first session request includes a policy of the broadcast service and a PCC rule for charging control, wherein the PCC rule includes the broadcast service The temporary mobility group identity TMGI of the broadcast service or the TMGI of the broadcast service and the flow ID Flow ID, the destination IP address and port number of the designated UE, the quality of service QoS requirements of the broadcast service, and the BMSC identity that manages the broadcast service. 24. The packet data gateway according to claim 23, wherein the processing unit is specifically configured to: acquiring the PCC rule in the first session update request received by the receiving unit, and determining the designated UE according to the destination IP address of the designated UE in the PCC rule; Select the established EPS bearer of the designated UE to transmit the broadcast service according to the QoS requirements of the broadcast service in the PCC rule; or, establish a new EPS bearer of the designated UE to transmit the broadcast service ; The broadcast service is sent to the destination IP address and port number of the designated UE in the PCC rule through the EPS bearer of the designated UE. 25. The packet data gateway according to claim 22, wherein the obtaining unit is specifically configured to: sending a first broadcast service transmission request to the BMSC, to trigger the BMSC to obtain the IP multicast service address of the broadcast service from the MBMS gateway; Receive the broadcast service transmission response sent by the BMSC, and obtain the IP multicast service address of the broadcast service included in the broadcast service transmission response. 26. The packet data gateway according to claim 23, wherein the obtaining unit is specifically configured to: sending a first broadcast service transmission request to the BMSC, to trigger the BMSC to obtain the IP multicast service address of the broadcast service from the MBMS gateway; Receive the broadcast service transmission response sent by the BMSC, and obtain the IP multicast service address of the broadcast service included in the broadcast service transmission response. 27. The packet data gateway according to claim 24, wherein the obtaining unit is specifically configured to: sending a first broadcast service transmission request to the BMSC, to trigger the BMSC to obtain the IP multicast service address of the broadcast service from the MBMS gateway; Receive the broadcast service transmission response sent by the BMSC, and obtain the IP multicast service address of the broadcast service included in the broadcast service transmission response. 28. The packet data gateway according to any one of claims 22 to 27, wherein the receiving unit is further configured to: receiving a second session update request sent by the PCRF, where the second session update request is used to instruct the PGW to stop transmitting broadcast services in a unicast manner; The processing unit is further configured to release the binding of the IP multicast service address of the broadcast service and the EPS bearer of the designated UE, and stop transmitting the broadcast service through the EPS bearer of the designated UE; The sending unit is further configured to send a first broadcast service stop transmission request to the BMSC to indicate to the BMSC that the PGW has stopped transmitting the broadcast service; send a second broadcast service stop transmission request to the MBMS gateway to instruct the MBMS gateway to stop forwarding the broadcast service to the PGW. 29. The packet data gateway according to any one of claims 22 to 27, wherein the receiving unit is further configured to: When the broadcast service session ends, receive the broadcast service end indication sent by the BMSC; The processing unit is further configured to release the binding of the IP multicast service address of the broadcast service and the EPS bearer of the designated UE, and stop transmitting the broadcast service through the EPS bearer of the designated UE. 30. A packet data gateway, wherein the packet data gateway has all the characteristics of the packet data network according to any one of claims 22 to 28, and the PCC rule of the broadcast service includes a broadcast service transmission policy , wherein the broadcast service transmission policy is used to indicate the location range of the broadcast service transmission or to indicate whether the location range of the broadcast service transmission is the coverage range of the broadcast service; The processing unit is further configured to, according to the broadcast service transmission policy in the PCC rule in the first session update request, determine the location reporting area PRA corresponding to the location range for transmitting the broadcast service; The device also includes: a subscribing unit, configured to send a subscription UE location change event request to the mobility management entity MME, so as to request the MME to send the event that the designated UE enters the PRA and the event that the designated UE leaves the PRA; The processing unit is further configured to determine whether the designated UE is located within the location range of the transmission broadcast service according to the event of the UE entering or leaving the PRA sent by the MME, if the designated UE is located in the transmission broadcast service. Within the location range of the service, the broadcast service is transmitted through the EPS bearer of the designated UE. 31. The packet data gateway according to claim 30, wherein the sending unit is further configured to: If the broadcast service transmission policy in the PCC rule in the first session update request is used to indicate whether the location range for transmitting the broadcast service is the coverage range of the broadcast service, send the subscription broadcast service coverage to the BMSC request, to request the BMSC to send the coverage of the broadcast service; The processing unit is further configured to determine the location range of the broadcast service transmission according to the coverage range of the broadcast service sent by the BMSC, and form a PRA corresponding to the location range of the broadcast service transmission. 32. The packet data gateway according to claim 30 or 31, wherein the subscription unit is further used for: If the receiving unit receives the second session update request sent by the RCRF, or if the receiving unit receives the broadcast broadcast service end indication sent by the BMSC, it sends a request to stop subscribing to the UE location change event to the MME to request all The MME stops sending the event that the designated UE enters the PRA and the event that the designated UE leaves the PRA. 33. A multicast broadcast service center device, comprising: a receiving unit, configured to receive a first broadcast service transmission request sent by the packet data gateway PGW, where the first broadcast service transmission request is used to request to forward the IP multicast service address of the broadcast service; a sending unit, configured to send a session start request to the MBMS gateway before the broadcast service session starts, so as to request the MBMS gateway to send the IP multicast service address of the broadcast service; or, while the broadcast service session is in progress , sending a broadcast service address request to the MBMS gateway to request the MBMS gateway to send the IP multicast service address of the broadcast service; The sending unit is further configured to forward the IP multicast service address of the broadcast service sent by the MBMS gateway to the PGW, so that the PGW associates the IP multicast service address with the EPS bearer of the designated user equipment UE. The broadcast service is bound and transmitted through the EPS bearer of the designated UE. 34. The device according to claim 33, wherein the receiving unit is further configured to: receiving a session start response or a broadcast service address response sent by the MBMS gateway; The sending unit is specifically configured to, when the receiving unit receives a session start response or a broadcast service address response sent by the MBMS gateway, send the address of the broadcast service in the session start response or the broadcast service address response. The IP multicast service address is forwarded to the PGW through a broadcast service transmission response. 35. The device according to claim 33, wherein the receiving unit is further configured to: A first broadcast service stop transmission request sent by the PGW is received, where the first broadcast service stop transmission request is used to indicate that the PGW has stopped transmitting the broadcast service. 36. The device according to claim 34, wherein the receiving unit is further configured to: A first broadcast service stop transmission request sent by the PGW is received, where the first broadcast service stop transmission request is used to indicate that the PGW has stopped transmitting the broadcast service. 37. The device according to claim 33, wherein the sending unit is further configured to: When the broadcast service session ends, sending a session end request to the MBMS gateway to request the MBMS gateway to end the broadcast service session; The receiving unit is further configured to receive a session end response sent by the MBMS gateway; The sending unit is further configured to, when the receiving unit receives a session end response sent by the MBMS gateway, send a broadcast service end indication to the PGW to instruct the PGW to stop transmitting the broadcast service. 38. The device according to claim 34, wherein the sending unit is further configured to: When the broadcast service session ends, sending a session end request to the MBMS gateway to request the MBMS gateway to end the broadcast service session; The receiving unit is further configured to receive a session end response sent by the MBMS gateway; The sending unit is further configured to, when the receiving unit receives a session end response sent by the MBMS gateway, send a broadcast service end indication to the PGW to instruct the PGW to stop transmitting the broadcast service. 39. The device according to any one of claims 33 to 38, wherein the receiving unit is further configured to receive a subscription broadcast sent by the PGW after receiving the PCC rule of the broadcast service sent by the PCRF business coverage requests; The sending unit is further configured to send the coverage of the broadcast service to the PGW, so that the PGW obtains a location range for transmitting the broadcast service according to the coverage of the broadcast service. 40. A multimedia broadcast multicast service gateway, comprising: A receiving unit, configured to receive a session start request sent by a multicast broadcast service center BMSC when a broadcast service session starts, or, after the broadcast service session starts, receive a broadcast service address request sent by the BMSC, wherein all The session start request and the broadcast service address request are used to obtain the IP multicast service address of the broadcast service; a sending unit, configured to send the IP multicast service address of the broadcast service to the BMSC, so that the BMSC forwards the IP multicast service address of the broadcast service to the packet data gateway PGW; The receiving unit is further configured to receive a second broadcast service transmission request sent by the PGW; The sending unit is further configured to, after the receiving unit receives the second broadcast service transmission request sent by the PGW, send the broadcast service to the PGW through the IP multicast service address of the broadcast service, so that the PGW transmits the broadcast service through the EPS bearer of the designated UE. 41. The multimedia broadcast multicast service gateway according to claim 40, wherein the sending unit is specifically used for: Send the IP multicast service address of the broadcast service to the BMSC by sending a session start response, or by sending a broadcast service address response. 42. The multimedia broadcast multicast service gateway according to claim 40 or 41, wherein the receiving unit is also used for: receiving a second broadcast service stop transmission request sent by the PGW; The sending unit is further configured to stop sending the broadcast service to the PGW after the receiving unit receives the second broadcast service stop transmission request sent by the PGW. 43. A communication system for unicast transmission of broadcast multicast data, characterized in that the system comprises a packet data gateway, a multicast broadcast service center device and a multimedia broadcast multicast service gateway; The packet data gateway is the device according to any one of claims 22 to 29; The multicast broadcast service center device is the device described in any one of claims 33 to 39; The multimedia broadcast multicast service gateway is the device according to any one of claims 40 to 42. 44. A communication system for unicast transmission of broadcast multicast data, characterized in that the system comprises a packet data gateway, a multicast broadcast service center device, a multimedia broadcast multicast service gateway, and a mobility management entity device; The packet data gateway is the device according to any one of claims 30 to 32; The multicast broadcast service center device is the device described in any one of claims 33 to 39; The multimedia broadcast multicast service gateway is the device according to any one of claims 40 to 42; The mobility management entity device is configured to receive a subscribed UE location change event request sent by the packet data gateway, and send a report of the UE entering or leaving a specified location to the packet data gateway according to the subscribed UE location change event request District PRA events. 45. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and when the computer program is executed by hardware, the method according to any one of claims 1 to 21 can be performed.

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