TWI503016B - A method for performing handover, the system and apparatus - Google Patents

Description

Method, system and device for switching

The invention belongs to the field of wireless communication technologies, and in particular relates to a method, system and device for performing handover.

As shown in FIG. 1 , in the schematic diagram of the network architecture of the Evolved Universal Terrestrial Radio Access Network (E-UTRAN), the E-UTRAN is composed of an evolved base station (eNB).

The Mobility Management Entity (MME) and the eNB are connected by using an S1-MME interface; the eNB completes the access network function and communicates with the user equipment (User Equipment, UE) through the air interface. For each UE attached to the network, there is one MME serving it, and the MME is called the serving MME of the UE. The S1-MME interface provides the UE with control plane services, including mobility management and bearer management functions.

The Serving GW (S-GW) is connected to the eNB through an S1-U interface. For each UE attached to the network, there is an S-GW serving the UE. The S-GW is called a UE. Service S-GW. The S1-U interface provides user plane services for the UE, and the user plane data of the UE is carried in the S-GW and the eNB through the S1-U General Packet Radio Service (GPRS) Tunneling Protocol (GTP). Transfer between.

The user plane protocol stack between the UE and the network is as shown in FIG. 2, and the control plane protocol stack is as shown in FIG. 3. The user plane agreement includes a Packet Data Convergence Protocol (PDCP), a wireless chain. Radio Link Control (RLC), Medium Access Control (MAC) and Physical Layer (PHY); Control Plane Protocol includes Radio Resource Control (RRC) and Non-Access Layer (Non- Access Stratum (NAS), in which the RRC layer message needs to be processed by the user plane protocol layer, and then transmitted in the air interface; the NAS layer message is transmitted in the air interface encapsulation in the RRC message; and the S1-MME interface is transmitted on the S1 connection.

In the existing LTE/LTE-A network, the RRC/PDCP/RLC/MAC/PHY peer layer of the UE is located in the same eNB, and the NAS layer peer layer of the UE is located in the same eNB as the UE. S1 is connected to the MME.

In the existing agreement, the PDCP and the RLC entity correspond to the Data Radio Bearer (DRB)/Signal Radio Bearer (SRB) 1/SRB2, and each DRB and SRB1 and SRB2 respectively correspond to a set of PDCP. And the RLC entity; DRB/SRB1/SRB2 are aggregated at the MAC layer. Therefore, the UE will be composed of multiple sets of PDCP and RLC entities at the same time, but only one MAC layer and entity layer entity. The SRB belongs to the control plane bearer, and the DRB belongs to the user plane bearer.

In the existing hierarchical network as shown in FIG. 4, the macro cell provides basic coverage, the local cell provides hotspot coverage, and the data/signaling interface exists between the Local Cell and the Macro Cell ( The wired/wireless interface, the UE can work under the Macro eNB or Local eNB.

Since the local eNB controls the coverage of the cellular area and the number of UEs to be served is small, the UE connected to the Local eNB can often obtain better service quality, such as obtaining a higher service rate and a higher quality link. Therefore, when the UE connected to the Macro eNB approaches the local eNB controlled cell, it can switch to the Local eNB to obtain the service provided by the Local eNB; when the UE is away from the Hive controlled by the Local eNB, it needs to switch to the cellular controlled by the Macro eNB to Stay connected wirelessly. Due to the large number of Local eNBs and small coverage, the UE needs to frequently switch between the macro controlled by the Macro eNB and the Honeycomb controlled by the Local eNB. Since the switching frequency and the number of times of the UE are greatly increased, the risk of communication interruption when the UE performs handover is increased.

In summary, in the current network architecture of the E-UTRAN, the frequency and number of handovers of the UE are greatly increased, thereby increasing the risk of communication interruption when the UE performs handover.

A method, system and device for performing handover according to an embodiment of the present invention are provided to solve the problem that the UE is in the network architecture of the E-UTRAN in the prior art, because the switching frequency and the number of times of the UE are greatly increased, thereby increasing the handover of the UE. The problem of the risk of communication interruption.

A method for performing handover according to an embodiment of the present invention includes: receiving, by a user equipment, a notification that a handover is required from a macro base station; the user equipment maintains a control plane on the macro base station, and the user Some or all of the bearers of the face are switched to at least one base station.

Another method for performing handover according to the embodiment of the present invention includes: the macro base station determines that the user equipment needs to perform handover; and the macro base station sends a command for performing user plane switching to the user equipment, where The user equipment is notified to keep the control plane on the macro base station, and part or all of the user plane is switched to at least one base station.

Another method for performing handover according to an embodiment of the present invention includes: a local base station receives a user plane handover request message for a user equipment from a macro base station; and the local base station receives part or all of the user plane .

The user equipment of the embodiment of the present invention includes: a first receiving module, configured to receive a command for performing user plane switching from a macro base station; and a first processing module, It is used to maintain the control surface on the macro base station and switch some or all of the bearer of the user plane to at least one base station.

A macro base station for performing handover according to an embodiment of the present invention includes: a determining module, configured to determine that a user equipment needs to be switched; and a second processing module, configured to send, to the user equipment, a user The face switching command is used to notify the user equipment to keep the control plane on the macro base station, and switch part or all of the bearer of the user plane to at least one base station.

A local base station for performing handover according to an embodiment of the present invention includes: a second receiving module, configured to receive a user equipment from a macro base station The user plane switching request message; the third processing module is configured to receive part or all of the user plane.

A system for performing handover according to an embodiment of the present invention includes: a macro base station, configured to send a command for performing user plane switching to a user equipment, to notify the user equipment to keep the control plane in the giant Collecting a base station, and switching part or all of the bearer of the user plane to at least one base station; the user equipment is configured to receive a command from the macro base station for user plane switching, and maintain the control plane At the macro base station, part or all of the bearer of the user plane is switched to at least one base station.

The embodiment of the present invention reduces the number of times the user equipment performs the control plane handover, so that the UE switching frequency and the number of times increase in the network architecture of the E-UTRAN reduces the risk of communication interruption when the UE performs handover.

10‧‧‧Giant base station

20‧‧‧User equipment

30‧‧‧Local base station

1100‧‧‧First Receiver Module

1110‧‧‧First Processing Module

1210‧‧‧Determining modules

1220‧‧‧Second processing module

1310‧‧‧second receiving module

1320‧‧‧ Third Processing Module

1 is a schematic diagram of a network architecture of an E-UTRAN in the background art; FIG. 2 is a schematic diagram of a user plane protocol stack between a UE and a network in the background art; FIG. 3 is a diagram between a UE and a network in the background art. Schematic diagram of the control plane protocol stack; FIG. 4 is a schematic diagram of a hierarchical network deployment scenario in the background; FIG. 5 is a network architecture in which the user plane and the control plane are separated according to an embodiment of the present invention; FIG. 6 is a user of an embodiment of the present invention; FIG. 7 is a schematic diagram showing a partial separation of a user plane and a control plane according to an embodiment of the present invention; FIG. 8 is a schematic diagram of a user plane protocol stack between a UE and a network according to an embodiment of the present invention; 9 is a schematic diagram of a control plane protocol stack between a UE and a network according to an embodiment of the present invention; FIG. 10 is a schematic structural diagram of a system for performing handover according to an embodiment of the present invention; and FIG. 11 is a user in a system for performing handover according to an embodiment of the present invention; FIG. 12 is a schematic structural diagram of a macro base station in a system for performing handover according to an embodiment of the present invention; FIG. 13 is a schematic structural diagram of a local base station in a system for performing handover according to an embodiment of the present invention; A schematic flowchart of a method for performing handover of a user equipment according to an embodiment of the present invention; FIG. 15 is a schematic flowchart of a method for processing a handover of a user equipment by a macro base station according to an embodiment of the present invention; FIG. 16 is a schematic flowchart of a method for processing a handover of a user equipment by a local base station according to an embodiment of the present invention; A flowchart of a method for switching all control plane bearers from a macro hive to a local hive according to an embodiment of the present invention; FIG. 18 is a schematic flowchart of a method for switching from a local hive to a macro hive according to an embodiment of the present invention; and FIG. 19 is a schematic diagram In the embodiment of the invention, a schematic diagram of a method for switching from a local honeycomb to a local honeycomb.

In the embodiment of the present invention, the user equipment in the overlapping coverage area of the macrocell and the local honeycomb receives the notification that the handover needs to be performed from the macro base station; the user equipment maintains the control plane on the macro base station, and the user plane Some or all of the bearers are switched to at least one base station. The embodiment of the present invention reduces the number of times the user equipment performs the control plane handover, so that the UE switching frequency and the number of times increase in the network architecture of the E-UTRAN reduces the risk of communication interruption when the UE performs handover.

The macro base station is an LTE macro base station; the local base station is an LTE micro base station (Pico eNB) or a home base station (Home eNB) or a relay (Relay) device.

In order to reduce the frequency at which the UE switches between the Macro eNB cell and the Local eNB cell, a network deployment mode in which the user plane and the control plane are separated is introduced. As shown in FIG. 5, in this mode, when the UE is in an area where only the Macro eNB is covered by the cell, the control plane connection and the user plane of the UE are both connected to the Macro eNB; when the UE moves to the Macro eNB and the Local eNB, the hive overlap coverage In the area, all or part of the UE user plane is transferred to the Local eNB to obtain a higher service transmission rate; the control plane connection remains in the Macro eNB to prevent the UE from dropping the control plane connection handover failure.

In the case where the UE user plane and the control plane are separated, the UE is simultaneously connected to two or more eNBs. As shown in Figure 6, the UE is simultaneously connected to the Macro and Local eNB, respectively. Get the control plane and user plane connection.

The user plane and the control plane can also be separated in the form shown in FIG. 7, and part of the user plane of the UE is separated from the control plane. For example, it is used to carry voice and is sensitive to the interruption time. The user plane bearer of the service with small bandwidth requirement is maintained in the Macro eNB; the user plane bearer is not sensitive to the interruption time, and the user plane bearer of the service with large bandwidth requirement is used. Maintained at the Local eNB.

In the case where the user plane and the control plane are separated, the protocol stack between the UE and the network is as shown in Figs. 8 and 9. The user plane eNB (Local eNB) of the UE provides a user plane data transmission function for the UE, which has no RRC layer peering with the UE, and cannot perform RRC control on the UE; the control plane eNB (Macro eNB) of the UE provides a control plane message for the UE. The transport function, in order to implement the bearer and processing of the RRC message, the control plane eNB needs to have a user plane protocol stack that is peered with the UE; since the NAS message needs to be carried by the RRC message, the serving MME of the UE and the control plane eNB of the UE Connected.

As an enhancement, some RRC functions may exist between the UE and the user plane eNB. For example, the UE may read a broadcast message sent by the user plane eNB (the point-to-multipoint RRC message transmitted by the eNB to multiple UEs).

In order to support the above-described architecture in which the user plane and the control plane are separated, the present invention adopts a user plane node switching method corresponding thereto.

The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

In the following description, the implementation of the cooperation between the network side and the user equipment side will be described first, and finally the implementation from the network side and the user equipment side will be explained separately, but this does not mean that the two must be implemented together, actually In the above, when the network side is implemented separately from the user equipment side, the problems existing on the network side and the user equipment side are also solved, but when the two are used in combination, a better technical effect is obtained.

As shown in FIG. 10, the system for performing handover in the embodiment of the present invention includes the following steps: a macro base station 10 and a user equipment 20.

The macro base station 10 is configured to send a command for user plane switching to the user equipment 20, to notify the user equipment 20 to keep the control plane on the macro base station 10, and to All bearers (ie, some or all of the DRBs) are switched to at least one base station.

The user equipment 20 is configured to receive a command for performing user plane switching from the macro base station, hold the control plane at the macro base station, and switch part or all of the user plane to at least one base station. .

Preferably, the user equipment of the embodiment of the present invention may overlap the coverage area of the macro hive and the local hive.

In an implementation, the macro base station 10 sends a user plane switching message to the user equipment 20 for notifying the user equipment to keep the control plane on the macro base station, and switching some or all of the user planes to at least On a base station; correspondingly, after receiving the user plane switching message from the macro base station that needs to be switched, the user equipment 20 maintains the control plane on the macro base station 10, and the part of the user plane or All bearers are switched to at least one base station.

In order to distinguish the existing LTE for user plane switching commands (ie, user plane and control plane all switching), the macro base station 10 may add a user plane switching message to indicate user plane switching. Information, such as using 1-bit information to indicate that it is a user-side switch message. You can also build a new user plane switch message.

Wherein, part or all of the bearer of the user plane is switched to at least one base station, where the base station includes but is not limited to part or all of the following base stations: a macro base station and a local base station.

In an implementation, the macro base station 10 further sends a user plane handover request message to the local base station that needs to receive the user plane. Accordingly, the system of the embodiment of the present invention may further include: the local base station 30.

The local base station 30 is configured to receive a user plane switching request message from the macro base station for the user equipment, and accept part or all of the user plane.

The following is a detailed description according to different scenarios.

Scenario 1. Switching is to separate part or all of the bearer of the user plane from the control plane, that is, to switch part or all of the bearer of the user plane from the macro base station to at least one local base station.

Specifically, the macro base station 10 transmits an evolved access radio bearer including the user equipment that needs to be handed over to the local base station 30 that needs to receive the bearer of the user plane (Evolved) Radio Access Bearer (E-RAB) user plane switching request message carrying information; the local base station 30 determines the E-RAB that can be accepted according to the bearer information of the E-RAB that the user equipment needs to switch, and goes to the macro The base station 10 returns a user plane handover request response message including the E-RAB bearer information allowed to be accepted; the macro base station 10 generates a user plane handover message according to the received user plane handover request response message from the local base station.

Preferably, the user plane handover request response message includes, but is not limited to, at least one of the following information: an ID of the successfully accepted bearer; and an uplink forward carry GTP tunnel corresponding to the E-RAB bearer received by the bearer of the bearer of the user plane. Tunnel Endpoint Identifier (TEID) and transport layer address; the TEID and transport layer address of the downlink forward-bearing GTP tunnel corresponding to the E-RAB bearer received by the bearer of the bearer receiving the user plane; The bearer-accepted E-RAB corresponds to the TEID and transport layer address of the GTP tunnel carried by the downlink S1-U.

Preferably, after receiving the user plane switching message, the user equipment 20 synchronizes with the base station that is connected after the handover and after the handover, and establishes synchronization with the newly connected base station after the handover, and according to the received use. The configuration information in the message switching message is configured to configure the bearer of the user plane.

According to different situations, it can be divided into four ways of configuring the bearer of the user plane.

Method 1: The base station connected to the user equipment 20 after the handover is a part of the base station to which the user equipment 20 is connected before the handover. For example, the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A and B.

Specifically, the user equipment 20 deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, according to the configuration information of the user equipment in the user plane switching message, and the user who needs to switch. The bearer is multiplexed to the MAC layer entity and the PHY entity of the corresponding base station (ie, the user equipment 20 can also be used according to the user plane) The switched command reconfigures the MAC and PHY layer entities that are affected (the multiplexed bearer changes).

Method 2: The base station to which the user equipment is connected before the handover is a part of the base station to which the user equipment is connected after the handover. For example, the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A, B, C, and D.

Specifically, the user equipment generates, according to the configuration information of the base station in the user plane switching message, the MAC layer entity and the PHY entity corresponding to the base station that is not connected before the handover, and the user that needs to be switched. The plane carries the MAC layer entity and the PHY entity multiplexed to the corresponding base station.

In the third mode, the base station connected to the user equipment after the handover is the same as the base station connected to the user equipment before the handover. For example, the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A and D.

Specifically, the user equipment 20 deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, and generates and switches according to the configuration information of the user equipment that is received by the user equipment in the user plane switching message. The MAC layer entity and the PHY entity corresponding to the previously unconnected base station multiplex the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station.

In the fourth method, the base station connected to the user equipment after the handover is the same as the base station connected to the user equipment before the handover. For example, the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A, B, and C.

Specifically, the user equipment 20 multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY of the corresponding base station according to the configuration information of the user equipment in the user plane switching message receiving the user plane. entity.

Preferably, after the user equipment 20 multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the bearer carried by the user plane, if the configuration information corresponding to the macro base station is received, Reconfiguring the MAC layer entity and the PHY entity corresponding to the macro base station, and multiplexing the bearer remaining on the user plane of the macro base station to the reconfigured MAC layer entity and the PHY entity; if received The configuration information corresponding to the local base station reconfigures the MAC layer entity and the PHY entity corresponding to the local base station, and will remain in the present The bearer of the user plane of the base station is multiplexed onto the reconfigured MAC layer entity and PHY entity.

Preferably, after the user equipment 20 switches some or all of the bearers of the user plane to the at least one base station, the user equipment returns a user plane handover complete message to the macro base station 10; correspondingly, the macro base station 10, after receiving the user plane handover complete message from the user equipment, sending a path switch request to the MME, and after receiving the path switch request response from the MME, forwarding the path switch request to the local base station 30 carrying the user plane bearer Respond. Preferably. The path switching request includes a transport layer address of the bearer of the bearer receiving the user plane and a TEID of the GTP tunnel carried by the downlink S1-U corresponding to the E-RAB of the bearer received by the bearer of the user plane.

After receiving the path conversion request response from the macro base station, the local base station 30 notifies the macro base station 10 to release the bearer resources of the switched user plane; the macro base station 10 receives the release notification from the local base station 30. After that, the resources of the user plane corresponding to the switched bearer are released.

Scenario 2: Switching is to aggregate part or all of the bearer of the user plane with the control plane, that is, to switch part or all of the bearer of the user plane from at least one local base station to the macro base station.

Specifically, after successfully receiving the user plane of the user equipment, the macro base station 10 notifies the specific base station to suspend the data transmission carried by the switched user plane, wherein the specific base station is the user plane bearer of the switched user equipment is reduced. a base station (including a base station that is not connected to the user equipment after the handover, and a base station that is connected to the user equipment after the handover but has a reduced number of bearers than the user plane of the user equipment before the handover, etc.); Correspondingly, the local base station 30 performs the data pre-transmission process after receiving the notification from the macro base station to suspend the transmission of the user's data. For details of the data transmission process, refer to the 3GPP TS 36.300 protocol, and details are not described herein.

Preferably, the user plane switching message includes, but is not limited to, at least one of the following information: configuration information of the user equipment in the macro base station; and bearer information required to perform user plane switching; The information carried by the user plane that needs to be released; the information of the PHY entity and the MAC layer entity that need to be deleted.

Preferably, after receiving the user plane switching message, the user equipment 20 configures the bearer of the user plane according to the configuration information in the received user plane switching message.

According to different situations, it can be divided into two ways of configuring the bearer of the user plane.

Method 1: The base station connected to the user equipment 20 after the handover is a part of the base station to which the user equipment 20 is connected before the handover. For example, the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A and B.

Specifically, the user equipment 20 deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, according to the configuration information of the user equipment in the user plane switching message, and the user who needs to switch. The plane carries the MAC layer entity and the PHY entity multiplexed to the corresponding base station.

In the second mode, the base station connected to the user equipment after the handover is the same as the base station connected to the user equipment before the handover. For example, the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A, B, and C. A part of the bearer of the user plane in the local base station is switched to the macro base station.

Specifically, the user equipment 20 multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY of the corresponding base station according to the configuration information of the user equipment in the user plane switching message receiving the user plane. entity.

Preferably, after the user equipment 20 multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the bearer carried by the user plane, if the configuration information corresponding to the macro base station is received, And reconfiguring the MAC layer entity and the PHY entity corresponding to the macro base station, and multiplexing the DRB reserved in the target base station to the reconfigured MAC layer entity and the PHY entity.

Preferably, after the user equipment 20 switches some or all of the bearers of the user plane to the at least one base station, the user equipment returns a user plane handover complete message to the macro base station 10; correspondingly, the macro base station 10 on receiving the user from the user device After the handover complete message is sent, the path conversion request is sent to the MME, and after receiving the path conversion request response from the MME, the user equipment context release request is sent to the local base station 30 that is not reserved by any user plane of the user equipment after the handover. Transmitting a resource release request to the local base station 30 carried by the user plane of the user equipment after the handover; the local base station 30 releases the user equipment after receiving the user equipment context release request from the macro base station The bearer resources of all user planes; after receiving the resource release request from the macro base station, the local base station 30 releases the bearer resources of the switched user plane.

Scenario 3: Transfer some or all of the bearers of the user plane to the local base station, that is, switch some or all of the bearers of the user plane from at least one local base station to at least one local base station.

Specifically, the macro base station 10 transmits a user plane switching request message including the bearer information of the E-RAB that the user equipment needs to perform handover to the local base station 30 that needs to receive the user plane, and succeeds in the local base station. Receiving the user equipment of the user equipment and notifying the specific base station to suspend the data transmission of the switched user plane, wherein the specific base station is the base station with reduced user plane bearer of the user equipment after the handover (including not switching to the user after the handover) The base station to which the device is connected, and the base station to which the user equipment is connected after the handover, but after the handover, the number of bearers of the user plane of the user equipment before the handover is reduced, and the same is not repeated.) Determining the E-RAB that can be accepted according to the bearer information of the E-RAB that needs to be switched by the user equipment, and returning the user plane switching request response message including the E-RAB bearer information allowed to be accepted to the macro base station 10; The macro base station 10 generates a user plane switching message according to the received user plane switching request response message from the local base station; Given base station 30 local base station upon receipt of notification from the macro base station to suspend user data transmission side, a prequel to process information. For details of the data transmission process, refer to the 3GPP TS 36.300 protocol, and details are not described herein.

Preferably, the user plane handover request response message includes but is not limited to at least one of the following information: an ID of the admission bearer; The bearer ID of the rejected E-RAB bearer received by the bearer of the user plane and the TEID and transport layer address of the uplink forward bearer GTP tunnel; and the downlink of the E-RAB bearer received by the bearer of the bearer of the user plane The TEID and the transport layer address of the GTP tunnel carried by the downlink S1-U corresponding to the E-RAB of the bearer received by the bearer of the bearer of the user plane.

Preferably, the user plane switching message includes, but is not limited to, at least one of the following information: configuration information of the user equipment in the macro base station; bearer information that needs to be switched by the user plane, such as the bearer ID; Information carried by the user plane, such as the ID of the bearer; information of the PHY entity and the MAC layer entity that need to be deleted.

Preferably, after receiving the user plane switching message, the user equipment 20 synchronizes with the base station that is connected after the handover and after the handover, and establishes synchronization with the newly connected base station after the handover, and according to the received use. The configuration information in the message switching message is configured to configure the bearer of the user plane.

According to different situations, it can be divided into four ways of configuring the bearer of the user plane.

Method 1: The base station connected to the user equipment 20 after the handover is a part of the base station to which the user equipment 20 is connected before the handover. For example, the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A and B.

Specifically, the user equipment 20 deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, according to the configuration information of the user equipment in the user plane switching message, and the user who needs to switch. The plane carries the MAC layer entity and the PHY entity multiplexed to the corresponding base station.

Method 2: The base station to which the user equipment is connected before the handover is a part of the base station to which the user equipment is connected after the handover. For example, the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A, B, C, and D. Specifically, the user The device generates a MAC layer entity and a PHY entity corresponding to the base station that is not connected before the handover according to the configuration information of the user equipment in the user plane switching message, and the user plane bearer to be switched is multiplexed to Corresponding base station MAC layer entity and PHY entity.

In the third mode, the base station connected to the user equipment after the handover is the same as the base station connected to the user equipment before the handover. For example, the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A and D.

Specifically, the user equipment 20 deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, and generates and switches according to the configuration information of the user equipment that is received by the user equipment in the user plane switching message. The MAC layer entity and the PHY entity corresponding to the previously unconnected base station multiplex the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station.

In the fourth method, the base station connected to the user equipment after the handover is the same as the base station connected to the user equipment before the handover. For example, the user equipment 20 is connected to the base stations A, B, and C before the handover, and the base stations to which the user equipment 20 is connected after the handover are A, B, and C. A part of the bearer of the user plane in at least one base station is switched to another connected local base station.

Specifically, the user equipment 20 multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY of the corresponding base station according to the configuration information of the user equipment in the user plane switching message receiving the user plane. entity.

Preferably, after the user equipment 20 multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the bearer carried by the user plane, if the configuration information corresponding to the local base station is received, Reconfiguring the MAC layer entity and the PHY entity corresponding to the local base station, and multiplexing the bearer remaining on the user plane of the macro base station to the reconfigured MAC layer entity and the PHY entity.

Preferably, after the user equipment 20 switches some or all of the bearers of the user plane to the at least one base station, the user equipment returns a user plane handover complete message to the macro base station 10; correspondingly, the macro base station 10, after receiving the user plane handover complete message from the user equipment, sending a path switch request to the MME, and after receiving the path switch request response from the MME, forwarding the path switch request to the local base station 30 carrying the user plane bearer Response (here, the forwarding path conversion request response has two purposes: to inform the base station that the downlink GTP tunnel with the S-GW is successfully established; to inform the base station S-GW of the transport layer address, and the uplink tunnel identifier assigned to the bearer. TEID. Thereafter, the eNB may send the uplink data to the S-GW according to the transport layer address and TEID of the S-GW, and send the user equipment to the local base station 30 that is not reserved for all user planes of the user equipment after the handover. The context release request sends a resource release request to the local base station 30 carried by the user plane of the user equipment after the handover; preferably, the path transition request includes the transport layer address and the accepting user of the bearer that receives the bearer of the user plane. The TEID of the GTP tunnel carried by the downlink S1-U corresponding to the E-RAB of the bearer carried by the plane.

After receiving the user equipment context release request from the macro base station, the local base station 30 releases the bearer resources of all user planes of the user equipment; the local base station 30 receives the resource release request from the macro base station. After that, the hosted resources of the switched user plane are released.

As shown in FIG. 11, the user equipment in the system for switching in the embodiment of the present invention includes: a first receiving module 1100 and a first processing module 1110.

The first receiving module 1100 is configured to receive a command for performing user plane switching from the macro base station; the first processing module 1110 is configured to maintain the control plane on the macro base station, and the user plane Some or all of the bearers are switched to at least one base station.

The first receiving module 1100 can be a receiving module such as an antenna. The first processing module 1110 can be a CPU (general purpose processor), a DSP (digital signal processor), or an FPGA (programmable logic gate array).

Preferably, the command received by the first receiving module 1100 for performing user plane switching is a user plane switching message.

If the switching is performed, part or all of the bearer of the user plane is separated from the control plane or part or all of the user plane is transferred between the local base stations; the first processing module 1110 is connected before and after the switching. The base station maintains synchronization and establishes synchronization with the newly connected base station after the handover, and configures the bearer of the user plane according to the configuration information in the received user plane switching message.

If the switching is performed, part or all of the bearer of the user plane is aggregated with the control plane; The first processing module 1110 configures the bearer of the user plane according to the configuration information in the received user plane switching message.

Preferably, the first processing module 1110 is specifically configured to: if the base station connected to the user equipment after the handover is a part of the base station connected by the user equipment before the handover, according to the user plane switching message, the user equipment is switched. The configuration information of the base station deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover; if the base station connected to the user equipment before the handover is a part of the base station to which the user equipment is connected after the handover, the user plane switches according to the user plane. In the message, the configuration information of the base station of the user equipment after the handover is generated, and the MAC layer entity and the PHY entity corresponding to the base station not connected before the handover are generated; if the base station connected to the user equipment after the handover is connected, the user equipment connected to the user equipment before the handover is connected. The base station part is the same. The user equipment in the user plane switching message receives the configuration information of the hive carried by the user plane, deletes the MAC layer entity and the PHY entity corresponding to the unconnected base station after the handover, and generates and switches before The MAC layer entity and the PHY entity corresponding to the unconnected base station; if the user equipment connected to the base station and the user before the handover after the handover The base station to be connected is the same. According to the configuration information of the user equipment in the user plane switching message, the user plane carrying the handover needs to be multiplexed to the MAC layer entity and the PHY of the corresponding base station. entity.

Preferably, the first processing module 1110 multiplexes the bearer of the user plane that needs to be switched into the MAC layer entity and the PHY entity corresponding to the bearer carried by the user plane, and then receives the macro base station corresponding to the macro layer base station. After the configuration information is configured, the MAC layer entity and the PHY entity corresponding to the macro base station are reconfigured, and the bearer remaining on the user plane of the macro base station is multiplexed to the reconfigured MAC layer entity and the PHY entity.

Preferably, after the first processing module 1110 switches some or all of the bearers of the user plane to the at least one base station, the user plane switch completion message is returned to the macro base station.

As shown in FIG. 12, the macro base station in the system for switching in the embodiment of the present invention includes: a determining module 1210 and a second processing module 1220.

Determining a module 1210, configured to determine that the user equipment needs to be switched; The second processing module 1220 is configured to send a command for performing user plane switching to the user equipment, and notify the user equipment to keep the control plane on the macro base station, and switch part or all of the user plane Go to at least one base station.

The determining module 1210 may be a CPU (general purpose processor), a DSP (digital signal processor), or an FPGA (programmable logic gate array); the second processing module 1220 may be a CPU (general purpose processor), DSP (digital signal processor) or FPGA (programmable logic gate array), and device implementation of RF channel and antenna.

Preferably, the command for performing user plane switching is a user plane switching message.

Preferably, before the second processing module 1220 sends the user plane switching message to the user equipment, the information for indicating the user plane switching is added to the user plane switching message.

Preferably, if the switching is performed, part or all of the bearer of the user plane is separated from the control plane; before the second processing module 1220 sends the user plane switching message to the user equipment, the base is required to receive the user plane. The station sends a user plane switching request message including the bearer information of the E-RAB that the user equipment needs to switch; and generates a user plane switching message according to the received user plane switching request response message from the base station.

Preferably, after the second processing module 1220 sends a command for performing user plane switching to the user equipment, after receiving the user plane handover complete message from the user equipment, the second processing module 1220 sends a path conversion request to the MME; After the path conversion request response from the MME is sent, the path conversion request response is forwarded to the base station; after receiving the release notification from the base station, the resources of the switched user plane are released.

Preferably, if the switching is performed, part or all of the bearer of the user plane is aggregated with the control plane; before the second processing module 1220 sends the user plane switching message to the user equipment, the user plane of the user equipment is successfully received. Thereafter, the specific base station is notified to suspend the data transmission of the switched user plane; wherein, the specific base station is a base station with reduced user plane bearer of the switched user equipment.

Preferably, after the second processing module 1220 sends a command for performing user plane switching to the user equipment, the user plane switching completion message is received from the user equipment. Sending a path conversion request to the MME; after receiving the path conversion request response from the MME, sending a user equipment context release request to the specific base station that is not retained by all user planes of the user equipment after the handover, and after the handover A specific base station carried by a part of the user plane of the user equipment is reserved to send a resource release request.

Preferably, if the switching is performed, part or all of the bearer of the user plane is transferred between the local base stations; before the second processing module 1220 sends the user plane switching message to the user equipment, the bearer needs to receive the user plane. The base station sends a user plane switching request message including the bearer information of the E-RAB that the user equipment needs to perform handover, and generates a user plane switching message according to the received user plane switching request response message from the base station; After the base station successfully accepts the user of the user equipment, the base station notifies the specific base station to suspend the data transmission of the switched user plane, wherein the specific base station is the base station with reduced user plane bearer of the switched user equipment.

Preferably, after the second processing module 1220 sends a command for performing user plane switching to the user equipment, after receiving the user plane handover complete message from the user equipment, the second processing module 1220 sends a path conversion request to the MME; After the path conversion request response from the MME is sent, the path conversion request response is forwarded to the base station that is carried by the user plane, and the user equipment context release request is sent to the specific base station that is not reserved by the user plane of the user equipment after the handover. And sending a resource release request to a specific base station carried by a part of the user plane that retains the user equipment after the handover.

Preferably, the path switching request includes a transport layer address of the bearer of the bearer receiving the user plane and a TEID of the GTP tunnel carried by the downlink S1-U corresponding to the E-RAB of the bearer received by the bearer of the user plane.

As shown in FIG. 13, the local base station in the system for switching in the embodiment of the present invention includes: a second receiving module 1310 and a third processing module 1320.

The second receiving module 1310 is configured to receive a user plane switching request message for the user equipment from the macro base station, and the third processing module 1320 is configured to receive part or all of the user plane.

The second receiving module 1310 can be implemented by a device composed of a radio frequency channel and an antenna. The third processing module 1320 can be a CPU (general purpose processor) and a DSP (digital device). Signal processor) or FPGA (programmable logic gate array).

Preferably, the user plane switching request message includes the bearer information of the E-RAB that the user equipment needs to perform the handover; the third processing module 1320 determines the received E according to the bearer information of the E-RAB that the user equipment needs to perform the handover. - RAB, and return a user plane switch request response message containing the E-RAB bearer information allowed to be received to the macro base station.

Preferably, after receiving the partial or total bearer of the user plane, the third processing module 1320 notifies the macro base station to release the bearer resource of the switched user plane after receiving the path conversion request response from the macro base station.

Preferably, after the third processing module 1320 receives part or all of the user plane, the base station performs the data pre-transmission process after receiving the notification from the macro base station to suspend the user plane data transmission.

Preferably, after the data pre-transmission process is performed, the third processing module 1320 releases the bearer resources of all user planes of the user equipment after receiving the user equipment context release request from the macro base station.

Based on the same inventive concept, the embodiment of the present invention further provides a method for the user equipment to perform handover, a method for the macro base station to process the user equipment handover, and a method for the local base station to process the user equipment handover, because The principle of solving the problem by these methods is similar to the system for switching the embodiment of the present invention in FIG. 10, and therefore the implementation of these methods can be referred to the implementation of the system, and the repeated description is not repeated.

As shown in FIG. 14, the method for the user equipment to perform handover according to the embodiment of the present invention includes the following steps: Step 1401: The user equipment receives a command for performing user plane switching from the macro base station; Step 1402: User equipment The control surface is maintained at the macro base station and some or all of the user planes are switched to at least one base station.

Preferably, in step 1402, after receiving the user plane switching message from the macro base station that needs to be switched, the user equipment maintains the control plane on the macro base station and carries part or all of the user plane. Switch to at least one base station.

The following is a detailed description according to different scenarios.

Scenario 1. Switching is to separate part or all of the bearer of the user plane from the control plane, that is, to switch part or all of the bearer of the user plane from the macro base station to at least one local base station.

In step 1402, synchronization with the newly connected base station after the handover is synchronized with the base station connected before and after the handover, and the user information is changed according to the configuration information in the received user plane switching message. The bearer is configured.

According to different situations, it can be divided into four ways of configuring the bearer of the user plane.

Method 1: The base station to which the user equipment is connected after the handover is a part of the base station to which the user equipment 20 is connected before the handover.

Specifically, the user equipment deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover according to the configuration information of the user equipment in the user plane switching message, and the user plane that needs to be switched The bearer is multiplexed to the MAC layer entity and the PHY entity of the corresponding base station.

Method 2: The base station to which the user equipment is connected before the handover is a part of the base station to which the user equipment is connected after the handover.

Specifically, the user equipment generates, according to the configuration information of the base station in the user plane switching message, the MAC layer entity and the PHY entity corresponding to the base station that is not connected before the handover, and the user that needs to be switched. The plane carries the MAC layer entity and the PHY entity multiplexed to the corresponding base station.

In the third mode, the base station connected to the user equipment after the handover is the same as the base station connected to the user equipment before the handover.

Specifically, the user equipment deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, according to the configuration information of the user equipment that is received by the user equipment in the user plane switching message, and generates and switches before the handover. The MAC layer entity and the PHY entity corresponding to the unconnected base station multiplex the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station.

In the fourth method, the base station connected to the user equipment after the handover is the same as the base station connected to the user equipment before the handover.

Specifically, the user equipment multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station according to the configuration information of the user equipment that is received by the user equipment in the user plane switching message. .

Preferably, after the user equipment multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the bearer carried by the user plane, if the configuration information corresponding to the macro base station is received, Reconfiguring the MAC layer entity and the PHY entity corresponding to the macro base station, and multiplexing the bearer remaining on the user plane of the macro base station to the reconfigured MAC layer entity and the PHY entity.

Preferably, after the user equipment user equipment switches some or all of the bearers of the user plane to the at least one base station, the user plane handover completion message is returned to the macro base station.

Scenario 2: Switching is to aggregate part or all of the bearer of the user plane with the control plane, that is, to switch part or all of the bearer of the user plane from at least one local base station to the macro base station.

Preferably, after receiving the user plane switching message, the user equipment configures the bearer of the user plane according to the configuration information in the received user plane switching message.

According to different situations, it can be divided into two ways of configuring the bearer of the user plane.

Method 1: The base station to which the user equipment is connected after the handover is a part of the base station to which the user equipment 20 is connected before the handover.

Specifically, the user equipment deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover according to the configuration information of the user equipment in the user plane switching message, and the user plane that needs to be switched The bearer is multiplexed to the MAC layer entity and the PHY entity of the corresponding base station.

In the second mode, the base station connected to the user equipment after the handover is the same as the base station connected to the user equipment before the handover.

Specifically, the user equipment multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station according to the configuration information of the user equipment that is received by the user equipment in the user plane switching message. .

Preferably, after the user equipment multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the bearer carried by the user plane, if the configuration information corresponding to the macro base station is received, Reconfiguring the MAC layer entity and the PHY entity corresponding to the macro base station, and multiplexing the bearer remaining on the user plane of the macro base station to the reconfigured MAC layer entity and the PHY entity.

Preferably, after the user equipment user equipment switches some or all of the bearers of the user plane to the at least one base station, the user plane handover completion message is returned to the macro base station.

Scenario 3: Transfer some or all of the bearers of the user plane to the local base station, that is, switch some or all of the bearers of the user plane from at least one local base station to at least one local base station.

Preferably, in step 1402, the base station connected before and after the handover is synchronized with the newly connected base station after the handover, and the configuration information in the message is switched according to the received user plane. Configure the bearer of the user plane.

According to different situations, it can be divided into four ways of configuring the bearer of the user plane.

Method 1: The base station to which the user equipment is connected after the handover is a part of the base station to which the user equipment 20 is connected before the handover.

Specifically, the user equipment deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover according to the configuration information of the user equipment in the user plane switching message, and the user plane that needs to be switched The bearer is multiplexed to the MAC layer entity and the PHY entity of the corresponding base station.

Method 2: The base station to which the user equipment is connected before the handover is a part of the base station to which the user equipment is connected after the handover.

Specifically, the user equipment generates, according to the configuration information of the base station in the user plane switching message, the MAC layer entity and the PHY entity corresponding to the base station that is not connected before the handover, and the user that needs to be switched. The plane carries the MAC layer entity and the PHY entity multiplexed to the corresponding base station.

Method 3: The base station connected to the user equipment after switching and the user setting before switching The part of the base station to be connected is the same.

Specifically, the user equipment deletes the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, according to the configuration information of the user equipment that is received by the user equipment in the user plane switching message, and generates and switches before the handover. The MAC layer entity and the PHY entity corresponding to the unconnected base station multiplex the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station.

In the fourth method, the base station connected to the user equipment after the handover is the same as the base station connected to the user equipment before the handover.

Specifically, the user equipment multiplexes the user plane bearer that needs to be handed over to the MAC layer entity and the PHY entity of the corresponding base station according to the configuration information of the user equipment that is received by the user equipment in the user plane switching message. .

Preferably, after the user equipment multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the bearer carried by the user plane, if the configuration information corresponding to the macro base station is received, Reconfiguring the MAC layer entity and the PHY entity corresponding to the macro base station, and multiplexing the bearer remaining on the user plane of the macro base station to the reconfigured MAC layer entity and the PHY entity.

Preferably, after the user equipment user equipment switches some or all of the bearers of the user plane to the at least one base station, the user plane handover completion message is returned to the macro base station.

As shown in FIG. 15, the method for processing the user equipment handover by the macro base station according to the embodiment of the present invention includes the following steps: Step 1501: The macro base station determines that the user equipment needs to be switched; Step 1502: The macro base station Sending a command for performing user plane switching to the user equipment, for notifying the user equipment to keep the control plane at the macro base station, and switching part or all of the user plane's bearer to at least one base station.

In step 1501, the macro base station sends a user plane switching message to the user equipment, to notify the user equipment to keep the control plane on the macro base station, and switch some or all of the user planes to at least one base. On the stage.

For the purpose of user plane switching with existing LTE (ie user The surface and the control plane are all switched. The macro base station can add information for instructing user plane switching in the user plane switching message, for example, using 1 bit information for instructing user plane switching. You can also build a new user plane switch message.

The following is a detailed description according to different scenarios.

Scenario 1. Switching is to separate part or all of the bearer of the user plane from the control plane, that is, to switch part or all of the bearer of the user plane from the macro base station to at least one local base station.

Specifically, the macro base station sends a user plane handover request message including the bearer information that the user equipment needs to perform handover to the local base station that needs to receive the user plane; preferably, the macro base station receives the The user plane switching request response message from the local base station generates a user plane switching message.

Preferably, the macro base station sends a path switching request to the MME after receiving the user plane handover complete message from the user equipment, and after receiving the path conversion request response from the MME, the local bearer is carried to the receiving user plane. The base station forwards the path conversion request response. Preferably. The path switching request includes a transport layer address of the bearer of the bearer receiving the user plane and a TEID of the GTP tunnel carried by the downlink S1-U corresponding to the E-RAB of the bearer received by the bearer of the user plane.

Preferably, the macro base station releases the resources of the switched user plane after receiving the release notification from the base station.

Scenario 2: Switching is to aggregate part or all of the bearer of the user plane with the control plane, that is, to switch part or all of the bearer of the user plane from at least one local base station to the macro base station.

Specifically, after successfully receiving the user plane of the user equipment, the macro base station notifies the specific base station to suspend the data transmission of the switched user plane, wherein the specific base station is the base of the user plane bearer of the user equipment after the handover. station.

Preferably, after receiving the user plane handover complete message from the user equipment, the macro base station sends a path switch request to the MME, and after receiving the path switch request response from the MME, does not retain the user after the switchover. Local basis carried by all user planes of the device The base station 30 sends a user equipment context release request, and sends a resource release request to the local base station 30 that is reserved by the user plane of the user equipment after the handover; scenario 3, part or all of the user plane is carried to the local base station. The transfer is to switch some or all of the bearers of the user plane from at least one local base station to at least one local base station.

Specifically, the macro base station sends a user plane switching request message including the bearer information of the E-RAB that the user equipment needs to perform handover to the local base station 30 that needs to receive the user plane, and successfully receives the information on the local base station. The user of the user equipment informs the specific base station to suspend the data transmission of the switched user plane, wherein the specific base station is the base station with reduced user plane bearer of the user equipment after the handover (including the user equipment after the handover) a connected base station, a base station connected to the user equipment after switching, but a base station having a reduced number of bearers on the user plane of the user equipment before switching, etc.); preferably, the macro base station receives the base station according to the received The user plane switching request response message from the local base station generates a user plane switching message; sends a path switching request to the MME after receiving the user plane handover complete message from the user equipment, and receives the path transition from the MME After requesting the response, the path conversion request response is forwarded to the local base station carried by the user plane, and Leaving the user equipment all the local base station 30 transmits a user plane bearer to the user equipment context release request, after switching to the reserved portion of the local base station UE user plane bearer 30 transmits the resource release request; preferably. The path switching request includes a transport layer address of the bearer of the bearer receiving the user plane and a TEID of the GTP tunnel carried by the downlink S1-U corresponding to the E-RAB of the bearer received by the bearer of the user plane.

14 and FIG. 15 can synthesize a process to form a method for performing handover, that is, step 1501 and step 1502 are performed first, and then step 1401 and step 1402 are performed.

As shown in FIG. 16, the method for processing a user equipment handover by a local base station according to an embodiment of the present invention includes the following steps: Step 1601: A local base station receives a user plane handover request for a user equipment from a macro base station Message; step 1602, the local base station accepts part or all of the user plane.

Preferably, the user plane switching request message includes the user equipment needs to cut The bearer information of the changed E-RAB; in step 1602, the local base station determines the received E-RAB according to the bearer information of the E-RAB that the user equipment needs to switch, and returns the E-containing admission to the macro base station. - The user plane switch request response message of the RAB bearer information.

Preferably, after the local base station receives part or all of the bearer of the user plane, after receiving the path conversion request response from the macro base station, the local base station is notified to release the bearer resource of the switched user plane.

Preferably, after the local base station receives part or all of the bearer of the user plane, the data pre-transmission process is performed after receiving the notification from the macro base station to suspend the transmission of the user plane data.

Preferably, after the local base station performs the data pre-transmission process, after receiving the user equipment context release request from the macro base station, the bearer resource of the switched user plane is released.

14 to 16 can synthesize a process to form a method for switching, that is, step 1501 and step 1502 are performed first, then step 1401 and step 1402 are performed, and finally step 1601 and step 1602 are performed.

The solution of the present invention will be described below by taking an example for each of the above three scenarios.

Example 1. When the user moves from the coverage of the macro eNB to the coverage of the local eNB, the network needs to replace the user plane transmission node with the Local eNB.

As shown in FIG. 17, the method for switching all control plane bearers from the macro hive to the local hive according to the embodiment of the present invention includes the following steps:

1. The Macro eNB performs measurement configuration on the UE, and the UE performs measurement according to the received measurement configuration information;

2. The UE reports the measurement result on the uplink resource allocated by the Macro eNB to the UE. The measurement result will be used to assist the Macro eNB in making handover decisions;

3. The Macro eNB performs measurement decisions. If the Macro eNB decides to switch, proceed to the subsequent steps;

4. The Macro eNB sends a user plane handover request to the Local eNB, and carries the message in the message: All E-RAB bearer information of the UE: including the ID of the bearer, the quality of service (QoS) parameter, the TEID of the corresponding uplink GTP tunnel, and the transport layer address of the uplink GTP tunnel (S-GW); The underlying configuration information of the Macro eNB includes: PDCP, RLC layer configuration, etc. Different from the existing handover request message of the LTE, the Macro eNB triggers the migration of the UE user plane bearer through the user plane handover request message, and implements the user plane and the control plane. The separation of the bearers.

5. The Local eNB refers to the message and performs an admission decision according to the QoS information of the bearer to be admitted. If the Local eNB allows to accept at least one to-be-switched bearer of the UE, perform an underlying configuration to prepare for handover;

If the local eNB decides to accept at least one to-be-switched bearer of the handover UE, the user plane handover request response is generated, and the message carries: the E-RAB bearer information that is allowed to be received: the bearer ID, and the E-RAB bearer corresponding to the E-RAB bearer. Uplink forwarding carries the TEID and transport layer address of the GTP tunnel; the corresponding downlink forward carries the TEID and transport layer address of the GTP tunnel; the corresponding TEID and transport layer address of the GTP tunnel carried by the downlink S1-U; E-RAB bearer information: including the bearer ID; the UE is in the bottom layer configuration information of the hive carried by the user plane, including: MAC, PHY layer configuration; receiving configuration information of the hive carried by the user plane: such as a physical random access channel (Physical Random Access Channel, PRACH) channel configuration; receiving a user plane bearer for the handover UE to assign a scheduling ID: Cell Radio Network Temporary Identifier (C-RNTI);

7. The macro eNB generates user plane switching signaling according to the information received in step 6, and sends the message to the UE. The message carries: configuration information of the hive that is carried by the user plane: for example, PRACH channel configuration; The Hive is assigned a scheduling ID for the handover UE: C-RNTI; optional carrying, configuration information of the UE in the source hive: MAC, PHY configuration, UE The MAC and PHY configurations of the source cell may change due to user plane switching; the UE is receiving configuration information of the hive carried by the user plane: MAC, PHY configuration; bearer information that needs to be switched by the user plane, such as a DRB ID, LCID, etc.; information to be released by the user plane to be released, such as DRB ID; security configuration: encryption algorithm and key information that the UE needs to use;

8. The Macro eNB sends the sequence number (SN) status information of the current data transmission (eg, the sequence number of the downlink data packet that was not successfully transmitted, the first sequence number that the Local eNB can assign, etc.) to the Local eNB; the transmission status is guaranteed to ensure Macro. The serial number of the data sent and received by the local eNB is continuous to avoid packet loss or recurrence. After the eighth step, the Macro eNB may send the downlink data packet that is received by the core network but has not been successfully sent to the UE to the Local eNB, so that the local The eNB transmits the same to the UE; similarly, the Macro eNB may receive the sequenced UE uplink data packet from the air interface. The air interface transmission error may cause the packet sent by the UE to be sent earlier than the first packet to be successfully received by the Macro eNB. Therefore, the Macro eNB receives the sequence number discontinuity and sends it to the Local eNB, so that the Local eNB sends the consecutive serial data packet to the core network after receiving the missing data packet retransmitted by the UE.

9. The UE sends a preamble (Preamble) to the Local eNB to establish uplink synchronization with the Local eNB. Specifically, after receiving the user plane handover signaling message, the UE synchronizes with the Macro service hive, and The Local Hive establishes synchronization. According to the parameters in step 7, the parameter configuration carried on the user plane is completed. After receiving the command of the user plane for performing the user plane switching, the UE generates a set of MAC and PHY entities corresponding to the Local eNB according to the configuration information of the hive carried on the user plane, and all the user planes that need to be switched. The bearer will be overwritten on the set of MAC and PHY entities for transmission; if the UE receives the configuration information corresponding to the Macro hive, the existing MAC and PHY entities are reconfigured, and the SRB will be overwritten with the set of MAC and On the PHY entity, the transmission is performed.

The UE needs to be able to distinguish the LTE command for user plane switching (using Both the face and the control plane are switched) and the user plane switches the message (only user plane switching). To this end, the user plane switching message may be indicated by the 1-bit information in the command for performing user plane switching in LTE, or a new message is defined for the user plane switching message.

10. The local eNB returns the response information, and carries the uplink resource (for subsequent transmission) allocated to the UE and the timing advance of the UE (for adjusting the uplink transmission time of the UE, and establishing uplink synchronization);

11. The UE returns a user plane handover success message to the Macro eNB. Since the control plane of the UE does not perform handover, the user plane handover success message (belonging to control plane signaling) needs to be sent to the Macro eNB.

12. The MME is requested by the Macro eNB to perform path translation. The message carries: bearer information that needs to be path-converted: includes the ID of the bearer, and carries the TEID of the corresponding downlink GTP tunnel (ie, the downlink S1-U GTP tunnel received in step 6) TEID), carrying the transport layer address of the corresponding GTP tunnel (ie, the IP address of the Local eNB, the Macro eNB may pass the OAM configuration or the TNL (Transport Network Layer) address discovery process To obtain the transport layer address of the neighboring local eNB). The Macro eNB obtains the information from step 6;

13. The MME requests the S-GW bearer modification request, and carries the Local eNB to specify the user plane transport layer address (IP address) and the downlink GTP tunnel identifier (TEID) for each UE Evolved Packet System (EPS) bearer. ;

14. The S-GW performs path conversion;

The S-GW returns a bearer modification response to the MME, and carries the user plane transport layer address (IP address) and the uplink GTP tunnel identifier (TEID) respectively designated by the S-GW for each UE EPS bearer;

After the S-GW completes the path conversion, the MME sends a path switch request response to the Macro eNB. The message carries: bearer information that needs to be converted: the bearer ID, the TEID of the corresponding uplink GTP tunnel, and the bearer corresponding to the bearer. The transport layer address of the GTP tunnel (S-GW).

Bearer information that needs to be released: the ID of the bearer.

17. The Macro eNB forwards the received path switch request response to the Local eNB. The local eNB releases the corresponding bearer according to the message, and updates the TEID and the transport layer address of the uplink GTP tunnel that is carried;

18. The Local eNB informs the Macro eNB to release the user plane resources. At this time, the user plane data transmission of the UE has been transferred to the Local eNB, so the Macro eNB can release related resources;

19. The Macro eNB releases the user plane resources.

Example 2: When the user moves from the coverage of the macro eNB to the coverage of the local eNB, the network can switch part of the bearer of the user plane to the Local eNB. The part of the user plane and the control plane are separated. The partial bearer of the user plane of the UE is connected to the same eNB, and the part of the remaining user plane is carried by other eNBs. The reason that the part of the user plane is separated from the control plane may be that, according to the handover algorithm, the Macro eNB only wants to switch part of the handover UE to other eNBs; or the handover Local eNB cannot accept all the user planes that the Macro eNB wants to switch. Carrying; or both.

Example 2 has the following differences compared with the first example: in step 4, the Macro eNB sends to the Local eNB not all the E-RAB bearer information of the handover UE: that is, the Macro eNB only wants to switch the partial bearer of the user plane of the UE. To the Local eNB; or: In step 6, the Local eNB cannot accept all bearers that the Macro eNB wishes to handover to the Local eNB.

In the above two cases, the Macro eNB only informs the handover UE to switch the bearer accepted by the Local eNB to the Local eNB in step 7.

After receiving the command for the user plane to switch, the UE generates a set of MAC and PHY entities corresponding to the Local eNB according to the configuration information of the hive carried on the user plane, and all the user planes that need to be switched are configured. The bearer will be used for the set of MAC and PHY entities for transmission; if the UE receives the configuration information corresponding to the source cell, the existing MAC and PHY entities are reconfigured, and the SRB and the unswitched DRB are overwritten. The set of MAC and PHY entities are transmitted.

Preferably, since the coverage of the local eNB is small, only the UE is away from the local eNB. The local eNB can be accessed when it is near. Because the distance is close, the signal quality of the local eNB to the UE is often better than the channel quality of the macro to the UE. Therefore, it is suitable to transmit data by using high-order modulation and coding, and the data transmission rate is high. However, the local eNB has a small coverage, and if the UE moves quickly, it will move out of the local coverage. Therefore, the UE will frequently switch, causing some data packet loss and transmission delay. For example, if the amount of business data is small, the delay requirement is high, such as VoIP, which can be transmitted in the macro; if the amount of business data is large, the delay requirement is low, and retransmission is allowed, and it can be transmitted in the local, such as the FTP service. Based on this, in step 4, the Macro eNB can determine which user plane bearers of the UE are to be handed over to the Local eNB according to the QoS requirements and the traffic volume.

Example 3: When the user moves out of the coverage of the Local eNB, the network needs to replace the user plane transmission node with the Macro eNB.

As shown in FIG. 18, the method for switching from a local cell to a macro cell in the embodiment of the present invention includes the following steps: before performing the process of FIG. 18, the UE maintains a connection with the Macro eNB and the Local eNB at the same time, and the control plane connection is located in the Macro. The partial bearer of the eNB, all or user plane is located in the Local eNB.

1. The Macro eNB performs measurement configuration on the UE, and the UE performs measurement according to the received measurement configuration information;

2. The UE reports the measurement result on the uplink resource allocated by the Macro eNB to the UE. The measurement result will be used to assist the Macro eNB in making handover decisions;

3. The Macro eNB performs measurement decisions. If the Macro eNB decides to perform a user plane switch, continue with the subsequent steps;

4. The Macro eNB acts as a Local eNB for user plane handover, and accepts the user plane bearer of the UE;

5. After the admission is successful, the Macro eNB notifies the Local eNB to suspend the user plane data transmission;

6. The Local eNB sends the sequence status information of the current data transmission to the Macro eNB (eg, the sequence number of the downlink data packet that was not successfully transmitted, the first serial number that the Local eNB can assign, etc.) to the Macro eNB; the transmission status is transmitted to ensure Macro. The serial number of the data sent and received by the Local eNB is continuous to avoid packet loss or repeated occurrence; After completing step 6, the Local eNB forwards the downlink data that has not been successfully sent to the UE and the uplink data that has not been submitted to the Serving GW to the Macro eNB. This process is similar to the data pre-transmission process in LTE.

7. The Macro eNB generates user plane handover signaling and sends it to the UE. The message carries: configuration information of the UE in the Macro eNB hive: MAC, PHY configuration, and the MAC and PHY configuration of the UE in the Macro eNB hive may be due to the user plane. Switching changes; bearer information for user plane switching, such as DRB ID, LCID, etc.; information to be released by the user plane to be released, such as DRB ID; PHY and MAC layer entities to be deleted.

In this example, there is also a possibility that the bearer is originally transmitted in a macro, such as a VoIP bearer, and therefore, the user plane switch has no effect on the bearer.

8. The UE deletes the MAC and PHY entity corresponding to the Local eNB according to the received user plane handover signaling, enables the newly received configuration on the MAC and PHY entities corresponding to the Macro eNB, and multiplexes the handover bearer to The MAC and PHY entities corresponding to the Macro eNB; delete the bearer that needs to be released, and return a user plane handover complete message to the network.

9. The Macro eNB initiates a path switching request to the MME, and carries the user plane transport layer address (IP address) and the downlink GTP tunnel identifier (TEID) respectively designated by the Local eNB for each UE EPS bearer;

10. The MME requests the S-GW bearer modification request, and carries the user plane transport layer address (IP address) and the downlink GTP tunnel identifier (TEID) respectively designated by the Macro eNB for each UE EPS bearer;

11. The S-GW performs path conversion;

12. The S-GW returns a bearer modification response to the MME, and carries the user plane transport layer address (IP address) and the uplink GTP tunnel identifier (TEID) respectively designated by the S-GW for each UE EPS bearer;

13. The MME returns a path switch response to the Macro eNB, and carries the user plane transport layer address (IP address) and the uplink GTP tunnel identifier respectively designated by the S-GW for each UE EPS bearer. (TEID); At this point, the path switch is completed. Thereafter, the downlink data packet sent to the UE, the S-GW sends it to the user plane transport layer address (IP address) specified by the corresponding Local eNB according to the bearer to which it belongs, and sets the downlink GTP tunnel identifier (TEID); For the uplink data packet sent by the UE, the Local eNB sends it to the user plane transport layer address (IP address) specified by the corresponding S-GW according to the bearer it belongs to, and sets the uplink GTP tunnel identifier (TEID).

14. The Macro eNB sends a UE context release request to the Local eNB;

15. The Local eNB releases the associated resources allocated for the handover UE.

After the above handover process is completed, both the user plane and the control plane of the UE are switched to the Macro eNB. In the above process, step 7 can occur before steps 5 and 6.

Example 4: The process in which the UE switches from local eNB2 to local eNB1.

As shown in FIG. 19, the method for switching from a local hive to a local hive according to an embodiment of the present invention includes the following steps:

1. The Macro eNB performs measurement configuration on the UE, and the UE performs measurement according to the received measurement configuration information;

2. The UE reports the measurement result on the uplink resource allocated by the Macro eNB to the UE. The measurement result will be used to assist the Macro eNB in making handover decisions;

3. The Macro eNB performs measurement decisions. If the Macro eNB decides to switch, proceed to the subsequent steps;

4. The macro eNB sends a user plane handover request to the local eNB1, where the message carries: all E-RAB bearer information of the UE: including the bearer ID, the QoS parameter, the TEID of the corresponding uplink GTP tunnel, and the uplink GTP tunnel (S -GW) transport layer address; low-level configuration information of the UE in the Macro eNB (ie, Macro eNB), including: PDCP, RLC layer configuration, etc.; unlike the existing LTE handover request message, the macro eNB switches the request message through the user plane. The migration of the user plane bearer of the UE is triggered, and the separation of the user plane and the control plane bearer is implemented.

5. Local eNB1 refers to the message and enters according to the QoS information of the bearer to be admitted. Accept the judgment. If the Local eNB allows the UE to be admitted, the underlying configuration is performed to prepare for handover;

If the Local eNB1 - the acknowledgment can accept the handover UE, the user plane handover request response is generated, and the message carries: the E-RAB bearer information that is allowed to be received: the bearer ID, and the E-RAB bearer corresponding uplink forward bearer GTP TEID and transport layer address of the tunnel; corresponding TEID and transport layer address of the GTP tunnel carrying the downlink forward;; corresponding TEID and transport layer address of the GTP tunnel carried by the downlink S1-U; E-RAB rejecting the admission Bearer information: including the bearer ID; the UE adopts the low-level configuration information of the hive carried by the user plane, including: MAC, PHY layer configuration; receiving the configuration information of the hive carried by the user plane: for example, the PRACH channel configuration; and receiving the hive carried by the user plane The scheduling ID assigned to the handover UE: C-RNTI;

7. After the admission is successful, the Macro eNB notifies the Local eNB 2 to suspend the user plane data transmission;

8. Local eNB2 sends the sequence status information of the current data transmission to the Macro eNB (eg, the sequence number of the downlink data packet that was not successfully transmitted, the first sequence number that the Local eNB can assign, etc.) is sent to the Macro eNB; the transmission and transmission status is guaranteed to be Local. The serial numbers of the data sent and received by the eNB1 and the local eNB2 are consecutive, to avoid packet loss or repeated occurrence;

9. The macro eNB generates user plane handover signaling, which is sent to the UE, and is carried in the message; the configuration information of the UE in the Local eNB1 hive: MAC, PHY configuration; bearer information that needs to be switched by the user plane, such as DRB ID, LCID, etc. Information that needs to be released by the user plane, such as the DRB ID; the PHY and MAC layer entities that need to be deleted.

In this example, there is also a possibility that the bearer is originally transmitted on the Macro eNB, such as a VoIP bearer, and therefore, the user plane switch has no effect on the bearer.

10. The UE deletes the MAC and PHY corresponding to the local eNB2 according to the received user plane handover signaling; establishes a MAC and a PHY corresponding to the local eNB1;

11. The UE sends a preamble (Preamble) to the Local eNB1 to establish and Local. Uplink synchronization of the eNB1; specifically, after receiving the message, the UE establishes synchronization with the local eNB1 cell on the basis of synchronization with the Macro eNB service cell. According to the parameters in the message 9, the parameter configuration carried on the user plane is completed. After receiving the command for the user plane to switch, the UE generates a set of MAC and PHY entities corresponding to the Local eNB1 according to the configuration information of the hive carried on the user plane, and all the user planes that need to be switched. The bearer will be applied to the set of MAC and PHY entities for transmission; the UE needs to be able to distinguish between the commands used by LTE for user plane switching (both user plane and control plane switching) and user plane switching messages (only User face switch). To this end, the user plane switching message may be indicated by the 1-bit information in the command for performing user plane switching in LTE, or a new message is defined for the user plane switching message.

12. The local eNB1 returns the response information, and carries the uplink resource allocated to the UE (for subsequent transmission) and the timing advance of the UE (for adjusting the uplink transmission time of the UE, and establishing uplink synchronization);

13. The UE returns a user plane handover success message to the Macro eNB. Since the control plane of the UE does not perform handover, the user plane handover success message (belonging to control plane signaling) needs to be sent to the Macro eNB.

14. The MME is requested by the Macro eNB to perform path translation. The message carries: bearer information that needs to be path-converted: includes the ID of the bearer, and carries the TEID of the corresponding downlink GTP tunnel (ie, the downlink S1-U GTP tunnel received in step 6) TEID), carrying the transport layer address of the corresponding GTP tunnel (ie, the IP address of the Local eNB1, the Macro eNB may obtain the transport layer address of the neighboring local eNB through the OAM configuration or the TNL address discovery procedure). The macro eNB obtains the information from step 6. In step 14, the macro notifies the MME that the transport layer address and the TEID allocated by the local eNB1 are obtained by the macro eNB in step 6.

15. The MME requests the S-GW bearer modification request, and carries the user plane transport layer address (IP address) and the downlink GTP tunnel identifier (TEID) respectively designated by the Local eNB for each UE EPS bearer;

16. The S-GW performs path conversion;

17. The S-GW returns a bearer modification response to the MME, and carries the user plane transport layer address (IP address) and the uplink GTP tunnel identifier (TEID) respectively designated by the S-GW for each UE EPS bearer;

After the S-GW completes the path conversion, the MME sends a path switch request response to the Macro eNB. The message carries: bearer information that needs to be converted: the bearer ID, the TEID of the corresponding uplink GTP tunnel, and the bearer corresponding to the bearer. The transport layer address of the GTP tunnel (S-GW).

Bearer information that needs to be released: the ID of the bearer.

19. The Macro eNB sends a UE context release request to the Local eNB2.

20. Local eNB2 releases the associated resources allocated for the handover UE.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Thus, the present invention can take the form of a fully hardware embodiment, a fully software embodiment, or an embodiment combining soft and hardware aspects. Moreover, the present invention may take the form of a computer program product embodied on one or more computer usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer usable code therein. .

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor or other programmable data processing device to produce a machine for executing instructions by a processor of a computer or other programmable data processing device Means are provided for implementing the functions specified in one or more of the flow or in one or more blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can boot a computer or other programmable data processing device to operate in a particular manner, such that instructions stored in the computer readable memory produce an article of manufacture including the instruction device. The instruction means implements the functions specified in one or more blocks of the flow or in a flow or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device to perform a series of operational steps on a computer or other programmable device to produce computer-implemented processing on a computer or other programmable device. The instructions executed above provide steps for implementing the functions specified in one or more blocks of the flowchart or in a block or blocks of the flowchart.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims (17)

A method for performing handover, the method comprising: receiving, by a user equipment, a command for performing a user plane handover from a macro base station; the user equipment maintaining a control plane at the macro base station, and Part or all of the bearer of the user plane is switched to the at least one base station; wherein the command for performing user plane switching is a user plane switching message; wherein the user plane switching is to carry part or all of the user plane Separating from the control plane or transferring part or all of the user plane to the local base station; the user equipment switches part or all of the user plane to at least one base station, including: the user equipment is Synchronizing with the base station connected before and after the handover, and synchronizing with the newly connected base station after the handover, and configuring the bearer of the user plane according to the received configuration information in the user plane switching message. Or, performing user plane switching is to aggregate part or all of the user plane with the control plane; the user equipment will be the user The part or all of the bearer is switched to the at least one base station, and the user equipment configures the bearer of the user plane according to the received configuration information in the user plane switching message; wherein the user equipment pair The user plane is configured to include: if the base station connected to the user equipment is a part of the base station connected to the user equipment before the handover, the user equipment switches the user equipment according to the user plane The configuration information of the base station after the handover, and the media access corresponding to the base station that is not connected after the handover is deleted. Controlling the MAC layer entity and the physical layer PHY entity; if the base station connected to the user equipment before the handover is a part of the base station to which the user equipment is connected after the handover, the user equipment switches the user equipment according to the user plane After the switching configuration of the base station, the MAC layer entity and the PHY entity corresponding to the base station not connected before the handover are generated; if the base station connected to the user equipment after the handover is connected with the base station connected to the user equipment before the handover The user equipment is configured to delete the MAC layer entity and the PHY entity corresponding to the unconnected base station according to the configuration information of the user equipment in the user plane switching message, and generate the MAC layer entity and the PHY entity that are not connected after the handover. a MAC layer entity and a PHY entity corresponding to the base station that is not connected before the handover; if the base station to which the user equipment is connected after the handover is the same as the base station to which the user equipment is connected before the handover, the user equipment switches according to the user plane The user equipment in the message receives the configuration information of the hive carried by the user plane, and multiplexes the user plane bearer that needs to be switched to the pair. The PHY entity and MAC layer entity of the base station. A method for performing handover according to claim 1, wherein the user equipment multiplexes the bearer of the user plane that needs to be handed over to the MAC layer entity and the PHY entity corresponding to the bearer carried by the user plane, The method further includes: after receiving the configuration information corresponding to the macro base station, the user equipment reconfigures the MAC layer entity and the PHY entity corresponding to the macro base station, and retains the use in the macro base station The bearer of the face is multiplexed onto the reconfigured MAC layer entity and PHY entity. The method of claim 1, wherein after the user equipment switches part or all of the bearer of the user plane to the at least one base station, the method further includes: The user equipment returns a user plane handover complete message to the macro base station. A method for performing handover, the method includes: the macro base station determines that the user equipment needs to perform handover; and the macro base station sends a command for performing user plane handover to the user equipment, for notifying The user equipment maintains the control plane on the macro base station, and switches part or all of the bearer of the user plane to at least one base station; wherein the command for performing user plane switching is a user plane switching message; The user plane switching is performed to separate part or all of the bearer of the user plane from the control plane; before the macro base station sends the user plane switching message to the user equipment, the method further includes: the macro base station needs to Receiving, by the base station that receives the user plane, a user plane handover request message including bearer information of the evolved access radio bearer E-RAB that the user equipment needs to perform handover; the macro base station receives the base station according to the received information The user plane switching request response message of the station generates a user plane switching message; wherein the macro base station transmits to the user equipment The user plane switching command is used to notify the user equipment to keep the control plane on the macro base station, and after switching some or all of the user planes to at least one base station, the method further includes: the giant After receiving the user plane handover complete message from the user equipment, the base station sends a path switch request to the mobility management entity MME; after receiving the path switch request response from the MME, the macro base station sends the path switch request to the MME. The base station forwards the path conversion request response; After receiving the release notification from the base station, the macro base station releases the resources of the switched user plane; or, the user plane switching is to aggregate part or all of the user plane with the control plane; the macro Before the base station sends the user plane switching message to the user equipment, the method further includes: the macro base station notifying the specific base station to suspend the data transmission of the switched user plane after successfully receiving the user plane of the user equipment; The specific base station is a base of reduced user plane bearer of the user equipment after the handover; wherein, after the macro base station sends a command for performing user plane switching to the user equipment, the method further includes: After receiving the user plane handover completion message from the user equipment, the base station sends a path conversion request to the MME; after receiving the path conversion request response from the MME, the macro base station does not retain the use after the handover. The specific base station carried by all the user planes of the device transmits the user equipment context release request, and the part that retains the user equipment after the handover The specific base station carried by the user plane sends a resource release request; or, the user plane switch is to transfer some or all of the bearer of the user plane to the local base station; the macro base station sends the user to the user equipment. Before the message is switched, the macro base station sends a user plane switching request message containing the bearer information of the E-RAB that the user equipment needs to perform handover to the base station that needs to receive the user plane, according to the receiving The user plane switching request response message from the base station is generated, and the user plane switching cancellation is generated. After the local base station successfully accepts the user plane of the user equipment, the macro base station notifies the specific base station to suspend the data transmission of the switched user plane, wherein the specific base station is the user of the switched user equipment. a base station with reduced coverage; wherein, after the macro base station sends a command for user plane switching to the user equipment, the method further includes: the macro base station receiving the user from the user equipment After the handover complete message is sent, the path conversion request is sent to the MME; after receiving the path conversion request response from the MME, the macro base station forwards the path conversion request response to the base station that carries the user plane, and does not reserve after the handover. The specific base station carried by the user plane of the user equipment sends a user equipment context release request, and sends a resource release request to a specific base station carried by the user plane of the user equipment after the handover; wherein the path conversion request The transport layer address of the bearer including the bearer receiving the user plane and the honeycomb receiving of the bearer receiving the user plane TEID GTP tunnel corresponding to the E-RAB bearer downlink S1-U. The method for performing the handover according to claim 4, wherein before the macro base station sends the user plane switching message to the user equipment, the method further includes: adding, by the macro base station, the user plane switching message Used to indicate information for user plane switching. A method for performing handover according to claim 4, wherein if the user plane switching is performed to separate part or all of the bearer of the user plane from the control plane, the user plane switching request response The message includes some or all of the following information: the identifier ID of the bearer; the transport layer address of the bearer that carries the user plane; and the general packet radio service carried by the downlink S1-U corresponding to the E-RAB that is received by the bearer of the bearer of the user plane. The tunnel endpoint ID of the tunneling protocol GTP tunnel identifies the TEID. A method for performing handover according to claim 4, wherein if the user plane switching is performed, part or all of the bearer of the user plane is aggregated with the control plane, and the user plane switching message includes the following part or all of the information: The configuration information of the user equipment in the macro base station; the bearer information that needs to be switched by the user plane; the information carried by the user plane that needs to be released; the information of the PHY entity and the MAC layer entity that need to be deleted. A method for performing handover according to claim 4, wherein if the user plane switching is performed, part or all of the bearer of the user plane is transferred between the local base stations, and the user plane switching request response message includes the following part. Or all the information: the identifier ID of the bearer; the transport layer address of the bearer that carries the bearer of the user plane; the TEID of the GTP tunnel carried by the downlink S1-U corresponding to the E-RAB that is received by the bearer of the bearer of the user plane; The switching message includes some or all of the following information: configuration information of the user equipment in the macro base station; bearer information required for user plane switching; The information carried by the user plane that needs to be released; the information of the PHY entity and the MAC layer entity that need to be deleted. A user equipment for switching, wherein the user equipment comprises: a first receiving module, configured to receive a command for performing user plane switching from a macro base station; and a first processing module, configured to: Holding the control plane on the macro base station, and switching part or all of the bearer of the user plane to at least one base station; wherein the command for performing user plane switching is a user plane switching message; wherein, using The face switching is to separate part or all of the bearer of the user plane from the control plane or transfer part or all of the user plane to the local base station; the first processing module is specifically used for: After the switching, the connected base stations are synchronized, and the newly connected base station is synchronized with the switched, and the bearer of the user plane is configured according to the received configuration information in the user plane switching message; or, The user plane switching is to aggregate part or all of the user plane with the control plane; the first processing module is specifically configured to: switch according to the received user plane The configuration information is configured to configure a bearer of the user plane, wherein the first processing module is specifically configured to: if the base station connected to the user equipment after the handover is a part of the base station to which the user equipment is connected before the handover, Deleting the media access control MAC layer corresponding to the base station that is not connected after the handover according to the configuration information of the base station of the user equipment after the handover in the user plane switching message An entity and a physical layer PHY entity; if the base station to which the user equipment is connected before the handover is a part of the base station to which the user equipment is connected after the handover, according to the user plane switching message, the user equipment is in the base station after the handover Configuring information to generate a MAC layer entity and a PHY entity corresponding to the base station not connected before the handover; if the base station connected to the user equipment after the handover is the same as the base station part connected to the user equipment before the handover, according to the user In the face switching message, the user equipment is configured to receive the configuration information of the hive carried by the user plane, delete the MAC layer entity and the PHY entity corresponding to the base station that is not connected after the handover, and generate a MAC corresponding to the base station that is not connected before the handover. a layer entity and a PHY entity; if the base station to which the user equipment is connected after switching is the same as the base station to which the user equipment is connected before the handover, according to the user plane switching message, the user equipment is receiving the honeycomb carried by the user plane The configuration information is that the user plane that needs to be handed over is multiplexed to the MAC layer entity and the PHY entity of the corresponding base station. The user equipment for performing handover according to claim 9, wherein the first processing module is further configured to: multiplex the bearer of the user plane that needs to be switched to a MAC corresponding to the bearer carried by the user plane. After receiving the configuration information corresponding to the macro base station, the MAC layer entity and the PHY entity corresponding to the macro base station are reconfigured and retained in the macro base station. The bearer of the user plane is multiplexed onto the reconfigured MAC layer entity and PHY entity. The user equipment for switching according to claim 9, wherein the first processing module The method is further configured to: after switching some or all of the bearers of the user plane to the at least one base station, return a user plane handover complete message to the macro base station. A macro base station for performing handover, wherein the macro base station includes: a determining module, configured to determine that a user equipment needs to be switched; and a second processing module, configured to send to the user equipment a user plane switching command for notifying the user equipment to maintain the control plane on the macro base station, and switching part or all of the user plane to at least one base station; wherein the user is The command of the face switch is a user face switch message; wherein the switch is to separate part or all of the bearer of the user plane from the control plane; the second processing module is further configured to: send the user plane switch message by the user equipment The user plane switching request message including the bearer information of the evolved access radio bearer E-RAB that the user equipment needs to perform handover is sent to the base station that needs to receive the user plane; according to the received base station from the base station The user plane switching request response message generates a user plane switching message; wherein the second processing module is further configured to: notify the user equipment to control After the face is held in the macro base station, and part or all of the bearer of the user plane is switched to the at least one base station, after receiving the user plane handover complete message from the user equipment, the mobility management entity MME is received. Transmitting a path conversion request; after receiving the path conversion request response from the MME, forwarding the path conversion request response to the base station; releasing the resource of the switched user plane after receiving the release notification from the base station; Or, performing user plane switching is to aggregate some or all of the bearer of the user plane with the control plane; the second processing module is further configured to successfully accept the use before sending the user plane switching message to the user equipment. The user of the device notifies the specific base station to suspend the data transmission of the switched user plane; wherein the specific base station is the base station with reduced user plane bearer of the switched user equipment; wherein the second processing mode The group is further configured to: after sending a command for performing user plane switching to the user equipment, send a path conversion request to the MME after receiving the user plane handover complete message from the user equipment; After the path conversion request of the MME is responded, the user equipment context release request is sent to the specific base station that is not reserved by the user plane of the user equipment after the handover, and the specific user plane bearer of the user equipment is reserved after the handover. The base station sends a resource release request; or, the user plane switch is to perform partial or full bearer of the user plane for the local base. The second processing module is further configured to: before sending the user plane switching message to the user equipment, send the E-including the user equipment that needs to be switched to the base station that needs to receive the user plane The user plane switching request message carrying information of the RAB generates a user plane switching message according to the received user plane switching request response message from the base station; after the local base station successfully accepts the user plane of the user equipment Notifying a specific base station to suspend data transmission of the switched user plane, wherein the specific base station is a base station with reduced user plane bearer of the switched user equipment; The second processing module is further configured to: after sending a command for performing user plane switching to the user equipment, send a path conversion to the MME after receiving a user plane handover complete message from the user equipment. Receiving, after receiving the path conversion request response from the MME, forwarding the path conversion request response to the base station carrying the user plane, and transmitting the use to the specific base station that is not reserved by all user planes of the user equipment after the handover a device context release request, and transmitting a resource release request to a specific base station carried by a part of the user plane of the user equipment after the handover; wherein the path transition request includes a transport layer address and admission of the bearer of the bearer receiving the user plane The TEID of the GTP tunnel carried by the downlink S1-U corresponding to the E-RAB received by the bearer of the bearer of the user plane. The macro base station for switching according to claim 12, wherein the second processing module is further configured to: add the user plane switching message to the user equipment before sending the user plane switching message to the user equipment Used to indicate information for user plane switching. The macro base station for switching according to claim 12, wherein if the user plane switching is performed, part or all of the bearer of the user plane is separated from the control plane, and the user plane switching request response message includes the following Part or all of the information: the identifier ID of the bearer; the transport layer address of the bearer that carries the user plane; the GTP tunnel of the general packet radio service tunnel protocol carried by the downlink S1-U corresponding to the E-RAB received by the bearer of the bearer of the user plane The tunnel endpoint identifies the TEID. A macro base station for switching as described in claim 12, wherein the user plane is performed The switching is to aggregate part or all of the bearer of the user plane with the control plane. The user plane switching message includes some or all of the following information: configuration information of the user equipment in the macro base station; user plane switching is required. Bearer information; information carried by the user plane that needs to be released; information of the PHY entity and MAC layer entity that need to be deleted. The macro base station for switching according to claim 12, wherein, if the user plane switching is performed, part or all of the user plane is transferred between the local base stations, and the user plane switching request response message is And including the following part or all of the information: the identifier ID of the bearer; the transport layer address of the bearer that carries the bearer of the user plane; and the TEID of the GTP tunnel carried by the downlink S1-U corresponding to the E-RAB that is received by the bearer of the bearer of the user plane; The user plane switching message includes some or all of the following information: configuration information of the user equipment in the macro base station; bearer information that needs to be switched by the user plane; information carried by the user plane that needs to be released; Information about PHY entities and MAC layer entities. A system for performing handover, characterized in that the system includes: a macro base station, configured to send a command for user plane switching to the user equipment, to notify the user equipment to keep the control plane in the giant The base station is configured to switch part or all of the bearer of the user plane to at least one base station; wherein the command for performing user plane switching is a user plane switching message; wherein, the user plane switching is performed by the user The part or all of the bearer is separated from the control plane; the macro base station is further configured to: send the user including the user to the base station that needs to receive the user plane before sending the user plane switching message to the user equipment The device needs to perform handover, and the user plane switching request message of the bearer information of the evolved access radio bearer E-RAB is generated; and the user plane switching request message is generated according to the received user plane switching request response message from the base station; wherein The macro base station sends a command for performing user plane switching to the user equipment, to notify the user equipment to control the surface protection After the macro base station and some or all of the bearers of the user plane are switched to the at least one base station, the method is further configured to: after receiving the user plane handover completion message from the user equipment, to the mobility management The entity MME sends a path conversion request; after receiving the path conversion request response from the MME, the path conversion request response is forwarded to the base station; after receiving the release notification from the base station, releasing the resource of the switched user plane Or, performing user plane switching is to aggregate part or all of the bearer of the user plane with the control plane; before the macro base station sends the user plane switching message to the user equipment, the macro base station is further configured to: successfully accept the The user of the user equipment notifies the specific base station to suspend the data transmission of the switched user plane; wherein the specific base station is the base station with reduced user plane bearer of the switched user equipment; wherein the macro base is After the station sends a command for performing user plane switching to the user equipment, the platform is further configured to: receive a user face from the user equipment After the completion message is sent, the path conversion request is sent to the MME; after receiving the path conversion request response from the MME, the user equipment context release request is sent to the specific base station that is not reserved by the user plane of the user equipment after the handover, And sending a resource release request to a specific base station carried by a part of the user plane of the user equipment after the handover; or performing user plane switching to transfer part or all of the bearer of the user plane to the local base station; Before transmitting the user plane switching message to the user equipment, the base station further includes: sending, to the base station that needs to receive the user plane, a user plane that includes the bearer information of the E-RAB that the user equipment needs to perform handover. Switching the request message, generating a user plane switching message according to the received user plane switching request response message from the base station; and notifying the specific base station to suspend the switching after the local base station successfully accepts the user plane of the user equipment Data transfer of the user plane, wherein the specific base station is a user of the switched user equipment a base station with reduced bearer; wherein, after the macro base station sends a command for performing user plane switching to the user equipment, the method further comprises: receiving a user plane handover completion message from the user equipment Sending a path switching request to the MME; after receiving the path switching request response from the MME, forwarding the path switching request response to the base station that is carried by the user plane, and not retaining all user plane bearers of the user equipment after the switching The specific base station sends a user equipment context release request, and sends a resource release request to a specific base station carried by a part of the user plane of the user equipment after the handover; wherein the path conversion request includes a bearer that receives the bearer of the user plane The transport layer address and the TEID of the GTP tunnel carried by the downlink S1-U corresponding to the E-RAB of the bearer received by the bearer of the user plane; the user equipment is configured to receive the user plane from the macro base station Switching commands, maintaining the control plane on the macro base station, and switching some or all of the user planes to at least one On the base station; wherein the command for user plane switching is a user plane switching message; wherein the user plane switching is to separate part or all of the user plane from the control plane or part of the user plane Or all the bearers are transferred between the local base stations; the user equipment switches part or all of the bearers of the user plane to at least one base station, including: the base station that the user equipment is connected before and after the handover While maintaining synchronization, synchronization is established with the newly connected base station after the handover, and the bearer of the user plane is configured according to the received configuration information in the user plane switching message; or, the user plane switching is used. Part or all of the facets are aggregated with the control plane; the user equipment switches part or all of the bearer of the user plane to the at least one base station, including: the user equipment switches according to the received user plane message The configuration information is configured to configure the bearer of the user plane; wherein the user equipment configures the bearer of the user plane, including: The base station connected to the user equipment is a part of the base station connected to the user equipment before the handover, and the user equipment deletes the configuration information of the base station of the user equipment after the handover according to the user plane switching message. a media access control MAC layer entity and a physical layer PHY entity corresponding to the unconnected base station after the handover; if the base station connected to the user equipment before the handover is a part of the base station to which the user equipment is connected after the handover, the user equipment the user plane switching PHY entity and MAC layer entity in the user message the base station device configuration information before the handover base station after generating the corresponding switching according unconnected; if the base of the switching device connected to the user The station is the same as the base station part connected to the user equipment before the handover, and the user equipment deletes the unconnected base after the handover according to the configuration information of the user equipment in the user plane switching message. a MAC layer entity and a PHY entity corresponding to the station, and generating a MAC layer entity and a PHY entity corresponding to the base station not connected before the handover; The base station to which the user equipment is connected is the same as the base station to which the user equipment is connected before the switching, and the user equipment switches the configuration information of the user equipment carried by the user equipment according to the user plane switching message. The user plane bearer that needs to be handed over is multiplexed to the MAC layer entity and the PHY entity of the corresponding base station; the local base station is configured to receive the user plane switch request for the user equipment from the macro base station The message accepts part or all of the user's face.