CN102036168A - Method and system for switching terminal under point to point load of multimedia broadcast multicast service - Google Patents

Abstract

The invention discloses a terminal handover method under the multimedia broadcast multicast service point-to-point bearer, comprising: when the source radio network controller RNC determines that the user terminal UE meets the handover condition, and the target cell is located in another RNC, the source RNC will Notify the other RNC of the information required for the handover of the UE under the multimedia broadcast multicast service MBMS point-to-point PTP bearer; the other RNC establishes radio resources for the UE in this RNC according to the information required for the handover , and send the MBMS data received by the UE at the source RNC to the UE by using the radio resource. The invention also discloses a terminal switching system under the point-to-point bearer of the multimedia broadcast multicast service. The invention can move the UE using the PTP to carry the MBMS service across RNCs without service interruption, thereby improving user experience.

Description

Terminal switching method and system under point-to-point bearer of multimedia broadcast multicast service

technical field

The present invention relates to the cross-radio network controller (RNC, Radio Network Controller) of the user terminal (UE, User Equipment) under the point-to-point (PTP, Point To Point) bearer of the Multimedia Broadcast Multicast Service (MBMS, Multimedia Broadcast Multicast Service) Handover technology, in particular, relates to a handover method and system for a terminal under point-to-point bearer of multimedia broadcast and multicast services in a code division multiple access (CDMA, Code Division Multiple Access) system.

Background technique

In order to meet the needs of users for multimedia services, the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) proposed an MBMS solution, which can efficiently utilize existing network resources. The types of MBMS services include multicast services, broadcast services and enhanced broadcast services. MBMS services have two wireless bearer modes on the Universal Terrestrial Radio Access Network (UTRAN, Universal Terrestrial Radio Access Network) side: PTP mode and point-to-multipoint (PTM, Point To Multi-Point). The characteristic of the PTP bearer mode is that each user monopolizes certain resources. The characteristic of the PTM bearer mode is that multiple users share certain resources. The RNC decides an appropriate bearer mode according to a certain algorithm, that is, to use PTP or PTM. Among them, the PTP bearer mode is applicable to multicast services and enhanced broadcast services. For multicast services, the UE first needs to establish a signaling connection with the core network (CN, Core Network). After the core network performs necessary processing, it notifies the RNC to allocate and establish radio resources for the UE. When the RNC establishes a After the radio resource management is completed, the dedicated signaling connection of the UE can be released. For the enhanced broadcast service, there will not be any signaling connection between the UE and the core network. In this way, for the UE applicable to the MBMS service, there may not be any connection between the UE and the core network.

An important characteristic of UE is mobility. When the UE carried by MBMS PTP moves across RNCs, it is necessary to change the serving RNC (source RNC) to another RNC (target RNC). Subsystem) relocation process. Fig. 1 is the flowchart of the existing SRNS relocation. As shown in Fig. 1, the SRNS relocation process includes: the source RNC initiates a RELOCATION REQUIRED message to the CN, carrying UE radio resource information and MBMS service information. Then the CN sends a RELOCATION REQUEST message to the target RNC to notify the target RNC of the UE's MBMS service information and PTP radio access bearer (RAB, Radio Access Bearer) information, and the target RNC now establishes PTP resources for the UE. After the relocation is completed, the target RNC completes the role transfer and becomes the serving RNC of the UE, and is responsible for providing MBMS service for the UE, while the source RNC releases the resources of the UE in this RNC.

When there is an IUR (interface between RNCs) connection between the source RNC and the target RNC, the mobility of MBMS PTP does not require the participation of the above-mentioned SRNS relocation process. The only difference is the interaction process between UE and RNC.

If there is no dedicated signaling connection between the UE and the CN, when the UE moves to the target RNC, the source RNC needs to first release the PTP bearer of the UE, and then the target RNC re-establishes the PTP bearer for the UE. In this way, when there is no signaling connection between the UE and the core network for the UE carried by MBMS PTP, the UE cannot perform handover through SRNS relocation specified by 3GPP. When this happens, the UE can only release the MBMS PTP bearer under the original RNC, and re-establish the MBMS PTP bearer under the new RNC, which will inevitably lead to interruption of the MBMS service of the UE, thereby affecting user experience.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a handover method and system for a terminal under the multimedia broadcast multicast service point-to-point bearer, which can realize the handover of the UE with the MBMS PTP bearer across RNCs without causing the current MBMS service of the UE to fail. interruption.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A method for switching a terminal under a point-to-point bearer of a multimedia broadcast multicast service, comprising:

When the source radio network controller RNC determines that the user terminal UE meets the handover conditions, and the target cell is located in another RNC, the source RNC notifies the UE of the information required for handover under the multimedia broadcast multicast service MBMS point-to-point PTP bearer another RNC;

The other RNC establishes a radio resource in this RNC for the UE according to the information required for the handover, and uses the radio resource to send the MBMS data received by the UE in the source RNC to the UE .

Preferably, the source RNC determines that the UE meets the handover conditions, including:

After receiving the 1B event or 1D event reported by the UE, the source RNC determines that the UE meets the handover condition.

Preferably, the source RNC notifies the other RNC of the information required for the handover of the UE under the MBMS PTP bearer through the IUR connection with the other RNC.

Preferably, the source RNC informs the other RNC by carrying the information required for the handover in an MBMS PTP relocation message or an MBMS attach command message.

Preferably, the information required for the handover includes at least radio resource information of the UE and MBMS information currently received by the UE; the radio resource information includes at least radio resource control RRC configuration information of the UE, the The MBMS information includes at least the MBMS Temporary Mobile Group Identity TMGI and the PTP Radio Access Bearer RAB identity.

Preferably, the other RNC establishes radio resources in this RNC for the UE, including:

The other RNC establishes at least packet data convergence protocol PDPC entity resources, radio link control RLC entity resources, and media access control MAC entity resources for the UE according to the radio resource information of the UE, and allocates new RNC entity resources for the UE. The radio network temporary identifier RNTI; and notify the UE through a UTRAN mobility information message.

A terminal switching system under the point-to-point bearer of multimedia broadcast multicast service, comprising:

A determining unit, located in the source RNC, configured to determine whether the UE meets the handover condition, determine whether the target cell for the UE handover is located in another RNC, and trigger the first notification unit when both are true;

A first notification unit, located in the source RNC, for notifying the other RNC of the information required for the handover of the UE under the MBMS point-to-point PTP bearer;

An establishing unit, located in the other RNC, configured to establish radio resources in this RNC for the UE according to the information required for the handover; and

A sending unit, configured to send the MBMS data received by the UE at the source RNC to the UE by using the radio resource.

Preferably, the determining unit determines that the UE meets the handover condition, including:

After receiving the 1B event or 1D event reported by the UE, the source RNC determines that the UE meets the handover condition.

Preferably, the first notification unit notifies the other RNC of the information required for the handover of the UE under the MBMS PTP bearer through the IUR connection between the source RNC and the other RNC.

Preferably, the first notification unit notifies the other RNC by carrying the information required for the handover in an MBMS PTP relocation message or an MBMS attach command message.

Preferably, the information required for the handover includes at least radio resource information of the UE and MBMS information currently received by the UE; the radio resource information includes at least radio resource control RRC configuration information of the UE, the The MBMS information includes at least the MBMS Temporary Mobile Group Identity TMGI and the PTP Radio Access Bearer RAB identity.

Preferably, the establishing unit establishes at least PDPC entity resource, RLC entity resource and MAC entity resource for the UE according to the radio resource information of the UE, and allocates a new RNTI for the UE; the system further includes a second The notification unit, located in the other RNC, is configured to notify the UE of the PDPC, RLC and MAC entity resources, and the new RNTI through a UTRAN mobility information message.

In the present invention, when the source RNC detects that the UE meets the handover conditions and the handover target cell is located in another RNC, the source RNC notifies the target RNC of the radio resource information of the UE and the current MBMS service information, and the target RNC The radio resource information re-establishes the radio resource for the UE, and sends the MBMS service received by the UE to the UE through the current radio resource, so as to realize the uninterrupted handover of the UE's MBMS service. The invention can move the UE using the PTP to carry the MBMS service across RNCs without service interruption, thereby improving user experience.

Description of drawings

Fig. 1 is the flowchart of existing SRNS relocation;

FIG. 2 is a flow chart of a method for handover of a terminal under a point-to-point bearer of a multimedia broadcast multicast service according to the present invention;

Fig. 3 is another flow chart of the handover method of the terminal under the multimedia broadcast multicast service point-to-point bearer of the present invention;

FIG. 4 is a schematic diagram of the composition and structure of the terminal switching system under the multimedia broadcast multicast service point-to-point bearer of the present invention.

Detailed ways

The basic idea of the present invention is: when the source RNC detects that the UE meets the handover conditions and the handover target cell is located in another RNC, the source RNC notifies the target RNC of the radio resource information of the UE and the current MBMS service information, and the target RNC The wireless resource is re-established for the UE according to the wireless resource information of the UE, and the MBMS service received by the UE is delivered to the UE through the current wireless resource, so as to realize the uninterrupted switching of the MBMS service of the UE.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail by citing the following embodiments and referring to the accompanying drawings.

Fig. 2 is the flow chart of the handover method of the terminal under the point-to-point bearer of the multimedia broadcast multicast service of the present invention, as shown in Fig. 2, in the present invention, the UE is receiving the MBMS service using the PTP bearer mode, and there is an IUR between the source RNC and the target RNC Connection, that is, the source RNC and the target RNC are connected through the IUR interface, the UE moves to the cell under the target RNC, and the source RNC initiates a PTP handover to the target RNC. During this process, the UE receives MBMS services without interruption. The switching method of the terminal under the multimedia broadcast multicast service point-to-point bearer of the present invention includes the following steps:

Step 201: According to the procedures stipulated by 3GPP, an MBMS service bearer is established between CN and RNC (source RNC).

Step 202: According to the procedure stipulated by 3GPP, the source RNC establishes the MBMS PTP bearer for the UE, and the UE starts to receive the MBMS service. At this time, there is no dedicated signaling connection between the UE and the CN.

Step 203: According to the procedures stipulated by 3GPP, the UE establishes an IUR connection between the source RNC and the target RNC, and the UE is in a macro-diversity state.

Step 204: Since the UE is in a cell under the target RNC, the UE reports a 1B or 1D event through a measurement report (Measurement Report).

Step 205: The source RNC determines that the UE no longer uses the radio resources in the RNC, makes an MBMS PTP decision to switch to the target RNC, and selects a target RNC. The source RNC receives the UE's measurement report 1D, the DRNC cell becomes the best cell, or 1B event, the quality of the RNC cell is too poor, it is judged that the UE can no longer use the resources in the cell under the RNC, and the source RNC selects a Drift RNC As the handover target RNC (the RNC to which the target cell belongs). Here, the way to select the target RNC is the same as the way to select the target RNC in the SRNS relocation process.

Step 206: The source RNC organizes the radio resource information of the UE in the RNC and the MBMS service information being received. Here, the radio resource information includes at least the radio resource control (RRC, Radio Resource Control) configuration of the UE, and the MBMS service information at least Including the temporary mobile group identification (TMGI, Temporary Mobile Group Identify) and PTP RAB ID of the business. The source RNC sends these information to the target RNC in an MBMS PTP relocation request (MBMS PTP RELOCATION REQUEST) message.

Step 207: After receiving the MBMS PTP RELOCATION REQUEST message, the target RNC detects that the MBMS service joined by the UE has started in the current RNC according to the MBMS service information therein. According to the radio resource information in the received MBMS PTP RELOCATION REQUEST message, the target RNC establishes resources within the RNC for the UE, including at least Packet Data Convergence Protocol (PDCP, Packet Data Convergence Protocol) entity resources, radio link control ( RLC, Radio LinkControl) entity resources and media access control (MAC, Medium Access Control) entity resources. The target RNC sends a UTRAN mobility information (UTRAN Mobility information) message to the UE, and allocates PDCP entity resources, RLC entity resources, and MAC entity resources for the UE, and allocates a new Radio Network Temporary Identity (RNTI, Radio Network Temporary Identity) is notified to the UE.

Step 208: The target RNC receives the UTRAN mobility information confirmation (UTRAN Mobility information confirm) message from the UE, the target RNC sends the MBMS service data from the IU port to the PDCP entity established for the UE, and the UE starts to receive the MBMS from the target RNC business data.

Step 209: At this time, the target RNC changes roles and becomes the RNC currently serving the UE.

Step 210: The target RNC returns an MBMS PTP relocation acknowledgment (MBMS PTP RELOCATION ACKNOWLEDGE) message to the source RNC, indicating that the PTP handover is successful.

Step 211: After receiving the handover success, the source RNC releases all resources of the UE in this RNC.

In the above process, if the target RNC cannot become the serving RNC of the UE, for example, radio resource allocation fails in step 207, or the target RNC does not receive the UTRAN Mobility information confirm message of the UE in step 208, etc., then the target RNC needs to report to the source RNC Return the switch failure message MBMS PTP relocation failure (MBMS PTP RELOCATION FAILURE) message. After receiving the MBMS PTP RELOCATION FAILURE message, the source RNC confirms that the current handover fails.

Fig. 3 is another flowchart of the switching method of the terminal under the point-to-point bearer of the multimedia broadcast multicast service of the present invention. As shown in Fig. 3, the switching method of the terminal under the point-to-point bearer of the multimedia broadcast multicast service of the present invention includes the following steps:

Step 301: Establish MBMS service bearer between CN and RNC according to the procedure stipulated by 3GPP

Step 302: According to the procedure stipulated by 3GPP, the source RNC establishes the MBMS PTP bearer for the UE, and the UE starts to receive the MBMS service. There is no dedicated signaling connection between UE and CN.

Step 303: According to the procedure stipulated by 3GPP, the UE establishes an IUR connection between the source RNC and the target RNC, and the UE is in a macro-diversity state.

Step 304: The UE reports a 1B or 1D event through a measurement report. When the UE moves to a cell under the target RNC and detects that the signal of the cell under the source RNC is no longer suitable for communication, but the cell under the target RNC is suitable for communication, it reports to the source RNC through a measurement report.

Step 305: The source RNC determines that the UE no longer uses the radio resources of the cell in this RNC, makes an MBMS PTP decision to switch to the target RNC, and selects a target RNC.

The above-mentioned processing methods of Step 301 to Step 305 are the same as the above-mentioned processing methods of Step 201 to Step 205 respectively.

Step 306: The source RNC organizes the radio resource information of the UE in the RNC and the MBMS service information being received. Here, the radio resource information includes at least the RRC configuration of the UE, and the MBMS service information includes at least the TMGI and PTP RAB ID of the service. The source RNC sends these information to the target RNC in an MBMS attach command (MBMS ATTACH COMMAND) message.

Step 307: After receiving the MBMS ATTACH COMMAND message, the target RNC detects that the MBMS service joined by the UE has been started in this RNC. According to the radio resource information in the MBMS ATTACH COMMAND message, the target RNC establishes resources in the RNC for the UE, including at least PDPC entity resources, RLC entity resources and MAC entity resources, and allocates a new RNTI for the UE. The target RNC sends the above entity resource information and the new RNTI to the UE through the UTRAN Mobility information message.

Step 308: The target RNC receives the UTRAN Mobility information confirm message from the UE, the target RNC sends the MBMS service data from the IU port to the PDCP entity established for the UE, and the UE starts to receive the MBMS service data from the target RNC.

Step 309: At this time, the target RNC changes roles and becomes the serving RNC of the UE.

Step 310: The source RNC sends an MBMS attach command in step 306, and directly releases all resources of the UE in this RNC.

In the above process, if the target RNC cannot become the serving RNC of the UE, for example, radio resource allocation fails in step 307, or the target RNC does not receive the UTRANMobility information confirm message from the UE in step 308, etc., there is no need to return the handover failure to the source RNC , and directly release the allocated resources in the RNC.

Fig. 4 is a schematic composition structure diagram of a terminal switching system under a point-to-point bearer of a multimedia broadcast multicast service according to the present invention. As shown in Fig. Unit 41, establishing unit 42, and sending unit 43, wherein the determining unit 40 is located in the source RNC, and is used to determine whether the UE meets the handover conditions, determine whether the target cell for the UE handover is located in another RNC, and trigger the first A notification unit 41; the first notification unit 41 is located in the source RNC, and is used to notify the other RNC of the information required for the UE handover under the MBMS point-to-point PTP bearer; the establishment unit 42 is located in the other RNC is used to establish radio resources for the UE in the current RNC according to the information required for the handover; the sending unit 43 is used to use the radio resources to send the MBMS data received by the UE in the source RNC to the Describe the UE. Wherein, the determining unit 40 determines that the UE satisfies the handover condition, including: after the source RNC receives the 1B event or 1D event reported by the UE, determines that the UE satisfies the handover condition. The information required for handover includes at least radio resource information of the UE and MBMS information currently received by the UE; the radio resource information includes at least radio resource control RRC configuration information of the UE, and the MBMS information includes at least MBMS The Temporary Mobile Group Identity TMGI and the PTP Radio Access Bearer RAB identity.

The first notification unit 41 notifies the other RNC of the information required for the handover of the UE under the MBMS PTP bearer through the IUR connection between the source RNC and the other RNC.

The first notification unit 41 notifies the other RNC by carrying the information required for the handover in an MBMS PTP relocation message or an MBMS attach command message.

The establishment unit 42 establishes at least PDPC entity resources, RLC entity resources and MAC entity resources for the UE according to the radio resource information of the UE, and allocates a new RNTI for the UE; as shown in FIG. 4 , the multimedia broadcast group of the present invention The switching system of the terminal under the broadcast service point-to-point bearer also includes a second notification unit 44, located in the other RNC, for notifying the PDPC, RLC and MAC entity resources, and the new RNTI through the UTRAN mobility information message The UE.

Those skilled in the art should understand that the system for switching terminals under the point-to-point bearer of the multimedia broadcast multicast service shown in FIG. The functions of each processing unit in the system can be understood with reference to the description of the aforementioned method, and the functions of each processing unit can be realized by a program running on a processor, or by a specific logic circuit.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (12)

1. A method for switching terminals under the multimedia broadcast multicast service point-to-point bearer, characterized in that, comprising: When the source radio network controller RNC determines that the user terminal UE meets the handover conditions, and the target cell is located in another RNC, the source RNC notifies the UE of the information required for handover under the multimedia broadcast multicast service MBMS point-to-point PTP bearer another RNC; and The other RNC establishes a radio resource in this RNC for the UE according to the information required for the handover, and uses the radio resource to send the MBMS data received by the UE in the source RNC to the UE . 2. The method according to claim 1, wherein the source RNC determines that the UE meets the handover condition, comprising: After receiving the 1B event or 1D event reported by the UE, the source RNC determines that the UE meets the handover condition. 3. The method according to claim 1, wherein the source RNC notifies the other RNC of the information required for the handover of the UE under the MBMS PTP bearer through an IUR connection with the other RNC . 4. The method according to claim 3, wherein the source RNC notifies the other RNC of the information required for the handover in an MBMS PTP relocation message or an MBMS Attach command message. 5. The method according to any one of claims 1 to 4, wherein the information required for the handover includes at least radio resource information of the UE and MBMS information currently received by the UE; The radio resource information includes at least the radio resource control RRC configuration information of the UE, and the MBMS information includes at least the MBMS Temporary Mobile Group Identity TMGI and the PTP Radio Access Bearer RAB identity. 6. The method according to claim 5, wherein said another RNC establishes a radio resource in this RNC for said UE, comprising: The other RNC establishes at least packet data convergence protocol PDPC entity resources, radio link control RLC entity resources, and media access control MAC entity resources for the UE according to the radio resource information of the UE, and allocates new RNC entity resources for the UE. The radio network temporary identifier RNTI; and notify the UE through a UTRAN mobility information message. 7. A terminal switching system under the multimedia broadcast multicast service point-to-point bearer, characterized in that it comprises: A determining unit, located in the source RNC, configured to determine whether the UE meets the handover condition, determine whether the target cell for the UE handover is located in another RNC, and trigger the first notification unit when both are true; A first notification unit, located in the source RNC, for notifying the other RNC of the information required for the handover of the UE under the MBMS point-to-point PTP bearer; An establishing unit, located in the other RNC, configured to establish radio resources in this RNC for the UE according to the information required for the handover; and A sending unit, configured to send the MBMS data received by the UE at the source RNC to the UE by using the radio resource. 8. The system according to claim 7, wherein the determining unit determines that the UE meets the handover condition, comprising: After receiving the 1B event or 1D event reported by the UE, the source RNC determines that the UE meets the handover condition. 9. The system according to claim 7, wherein the first notification unit notifies the information required for the handover of the UE under the MBMS PTP bearer through the IUR connection between the source RNC and the other RNC The other RNC. 10. The system according to claim 9, wherein the first notification unit notifies the other RNC by carrying the information required for the handover in an MBMS PTP relocation message or an MBMS Attach command message. 11. The system according to any one of claims 7 to 10, wherein the information required for the handover includes at least radio resource information of the UE and MBMS information currently received by the UE; The radio resource information includes at least the radio resource control RRC configuration information of the UE, and the MBMS information includes at least the MBMS Temporary Mobile Group Identity TMGI and the PTP Radio Access Bearer RAB identity. 12. The system according to claim 11, wherein the establishing unit establishes at least PDPC, RLC and MAC entity resources for the UE according to the radio resource information of the UE, and allocates a new RNTI for the UE The system also includes a second notification unit, located in the other RNC, for notifying the PDPC entity resource, the RLC entity resource and the MAC entity resource, and the new RNTI through a UTRAN mobility information message to the UE.

Images