WO2014015728A1 - Method and system for assigning c-rnti - Google Patents

Description

 Method and system for allocating C-RNTI

 The present application claims priority to Chinese Patent Application No. 201210258715.8, entitled "A C-RNTI Assignment Method and System", filed on July 24, 2012, the entire contents of which are incorporated herein by reference. In this application.

Technical field

 The present invention relates to the field of communications technologies, and in particular, to a C-RNTI allocation method and system. Background technique

 Statistics show that the traditional Macro e B (Macro Evolved NodeB) single-layer overlay network has been unable to meet the growing demand for data service rates and capacity. Therefore, 3GPP (3rd Generation Partnership Project) introduces a layered networking approach to solve this problem: By deploying some low-power base stations in small coverage environments such as hotspots, home indoor environments, and office environments, For example: Local eNB (Local Evolved Base Station) (including He B eNB (Home Base Station) / Pico eNB (Micro Base Station) / Relay (Relay), etc., to obtain the effect of cell splitting, enabling operators to provide users with higher data Rate, lower cost business.

 In the case of hierarchical networking, in order to enhance mobility management or increase the peak rate, the user equipment may aggregate resources of cells of multiple base stations, and each base station performs scheduling independently. The scheduling is based on C-RNTI (Cell Radio Network Temporary Identity).

 The network architecture of the LTE (Long Term Evolution) system is shown in Figure 1. The MME (Mobile Management Entity) and the eNB are connected by an S 1 -C interface. The eNB completes the access network function, and The UE (User Equipment) communicates through the wireless interface. For each UE attached to the network, there is an MME serving it. This MME is called the serving MME of the UE.

 The heterogeneous network deployment scenario including the Local eNB and the Macro eNB is shown in Figure 2. The Macro eNB provides macro coverage, and the Local eNB provides hotspot coverage within the macro coverage.

 For the network architecture shown in Figure 2, if the UE moves within the coverage of the Macro Cell according to the existing mechanism, the switching between the Macro cell and the Local cell may be continuously performed. In order to avoid interruption of data transmission caused by frequent handover, one way is to enable the UE to simultaneously aggregate the resources of the Local eNB and the Macro eNB, but the RRC (Radio Resource Control) connection is maintained under the Macro eNB, and the Local resource is only used for data. Transmission, that is, inter-base station aggregation (for the case of inter-base station aggregation, if different bearers of the UE are transmitted by different base stations aggregated by the UE, it may also be called aggregation between base stations as bearer separation).

However, for 3GPP Release (version) 11 and previous versions of UE, the UE can only work under one base station. And the base station allocates a C-RNTI for it. For R12 and later versions of the UE, resources of multiple base stations can be aggregated at the same time, but how to allocate C-RNTI to the UE in this case has not given a corresponding solution. Summary of the invention

 The embodiment of the present invention provides a C-RNTI allocation method and system, and is used to provide a solution for allocating C-RNTI to a UE when the UE aggregates resources of multiple base stations.

 A method for allocating a cell radio network temporary identifier C-RNTI according to an embodiment of the present invention includes: when a user equipment UE aggregates resources of a plurality of base stations, the first base station allocates a C-RNTI to the UE; A base station sends the C-RNTI allocated to the UE to the second base station participating in the aggregation through the inter-base station interface.

 A system for allocating a cell radio network temporary identifier C-RNTI according to an embodiment of the present invention includes: a first base station and a second base station that are aggregated by a user equipment UE;

 a first base station, configured to allocate a C-RNTI to the UE; and send, by using an inter-base station interface, a C-RNTI allocated to the UE to the second base station participating in the aggregation;

 The second base station is configured to receive a C-RNTI allocated by the first base station to the UE.

 In the embodiment of the present invention, when the user equipment UE aggregates resources of multiple base stations, the first base station is

The UE allocates a C-RNTI; the first base station sends the C-RNTI allocated to the UE to the second base station participating in the aggregation through the inter-base station interface, so that when the UE aggregates the resources of the multiple base stations, the C is allocated for the UE. -RNTI's solution. DRAWINGS

 1 is a schematic diagram of an E-UTRAN network architecture in the background art;

 2 is a schematic diagram of a heterogeneous network deployment scenario including a Local eNB and a Macro e B in the background; FIG. 3 is a schematic diagram of a bearer separation network architecture in the background art;

 4 is a schematic diagram of a bearer separated user plane protocol stack in the background art;

 FIG. 5 is a schematic diagram of a control plane protocol stack with bearer separation in the background art; FIG.

 FIG. 6 is a schematic flowchart diagram of a method for allocating a C-RNTI according to an embodiment of the present invention. detailed description

 The embodiment of the present invention provides a C-RNTI allocation method and system, and is used to provide a solution for allocating C-RNTI to a UE when the UE aggregates resources of multiple base stations.

There are multiple network architecture designs for inter-base station aggregation, for example, one of the network architectures and their corresponding user plane protocol stacks. The control plane protocol stack is shown in Figure 3, Figure 4 and Figure 5, respectively.

 Regardless of the inter-base station aggregation architecture, the Local eNB and the Macro e B have independent MAC (Medium Access Control) entities, and respectively schedule the RBs (Radio Bearers) carried by the nodes.

 The scheduling is divided into uplink scheduling and downlink scheduling, and the scheduled resources pass the PDCCH (Physical Downlink Control).

Channel, physical layer downlink control channel) is sent to the UE. The PDCCH is scrambled by the UE at the C-RNTI. The C-RNTI can uniquely identify a UE in a cell, and the C-RNTI is allocated by the base station to be accessed during the initial access or handover process of the UE.

 Referring to FIG. 6, a method for allocating a C-RNTI according to an embodiment of the present invention includes:

 S101. When the UE aggregates resources of multiple base stations, the first base station allocates a C-RNTI to the UE.

S102. The first base station sends the C-RNTI allocated to the UE to the second base station participating in the aggregation by using an inter-base station interface. Preferably, the first base station is any one of the base stations that the UE aggregates or the base station that maintains the UE RRC connection; and the second base station is another base station that is aggregated by the UE except the first base station.

 Preferably, the method further includes:

 The second base station determines whether there is a collision UE in the second base station, where the C-RNTI corresponding to the victim UE is the same as the C-RNTI allocated by the second base station to the UE;

 When there is a collision UE, the second base station replaces the C-RNTI of the victim UE; or, releases the RRC connection of the victim UE; or rejects the UE initiated by the first base station and uses the same C-RNTI as the UE to be collided Inter-base station aggregation request.

 Preferably, when there is a collision UE, the second base station replaces the C-RNTI of the victim UE, including: the second base station replaces its C-RNTI by performing intra-cell or inter-cell handover on the victim UE; or, second The base station updates the C-RNTI of the victim UE by using RRC signaling or MAC signaling or physical layer signaling, or

 If the radio bearer RB of the victim UE is separated into the second base station by the bearer separation process, the second base station notifies the base station that allocates the C-RNTI for the victim UE to be replaced with the C-RNTI allocated by the collided UE, and The base station indicates a complete set or subset of C-RNTIs currently available to the second base station.

 Preferably, when there is a collision UE, the second base station releases the RRC connection of the victim UE, including: the second base station directly sends an RRC connection release message to notify the UE to release the RRC connection; or

 If the radio bearer RB of the victim UE is separated into the second base station by the bearer separation process, the second base station notifies the base station that allocates the C-RNTI to the UE that is collided to release the RRC connection of the UE.

That is, in the present invention, when a UE aggregates resources of a plurality of base stations, it is allocated by one of the base stations. The C-RNTI then interacts with other base stations participating in the aggregation through the inter-base station interface. For the base station participating in the aggregation, if the C-RNTI and the other UEs served by the base station (which may be referred to as the victim UE) collide, the base station participating in the aggregation is responsible for solving the C-RNTI collision problem.

 A description of several embodiments provided by the present invention is given below.

 Example 1

 Step 1: The UE establishes an RRC connection on the Macro e B, and the Macro e B allocates a C-RNTI. Step 2: The Macro eNB determines whether it is necessary to perform inter-base station aggregation or determine whether to enable bearer separation for the UE or a certain RB of the UE. If enabled, select an appropriate Local eNB that participates in inter-base station aggregation or bearer separation according to the measurement of the UE. The inter-base station aggregation request message or the bearer separation request message is sent through the inter-base station interface (the X2 port or the newly introduced inter-base station interface). The content of the C-RNTK DRB (Data Radio Bearer) configuration information of the UE is carried in the inter-base station aggregation request message or the bearer separation request message.

 Step 3: The local eNB receives the inter-base station aggregation request message or the bearer separation request message, and determines whether there is a C-RNTI collision. If the C-RNTI carried in the inter-base station aggregation request message or the bearer separation request message has been allocated to the local eNB, For a certain UE (being the UE), the Local eNB can solve the C-RNTI collision problem by any of the following methods:

 Manner 1: The C-RNTI of the victim UE is replaced by handover, and the handover may be intra-cell or inter-cell handover. Manner 2: Re-assign a new C-RNTL to the victim UE by using RRC signaling or MAC signaling or physical layer signaling.

 Manner 3: Release the RRC connection of the victim UE.

 The mode 3 is generally applicable to the case where the RB of the victim UE has a lower priority.

 Step 4: The Local eNB performs an RB admission decision or an inter-base station aggregation decision to determine whether the separate bearer can be admitted or whether inter-base station aggregation is allowed. If so, a bearer separation response message or an inter-base station aggregation response message is sent to the Macro eNB.

 Step 5: The Macro eNB sends RRC reconfiguration signaling to the UE to reconfigure the DRB to Local e B.

 Step 6: The Local eNB uses the C-RNTI allocated by the Macro eNB to schedule the UE to perform data transmission on the Local eNB.

 It should be noted that: the C-RNTI conflict determination and the conflict resolution in step 3 and the RB admission determination in step four can be performed simultaneously, or any one of the steps can be performed preferentially, and the sequence is not strictly specified, but the local eNB needs to be guaranteed in C. - RNTI strives to resolve UEs that cannot be scheduled to perform inter-base station aggregation or bearer separation.

 Example 2:

Step 1: The UE establishes an RRC connection on the Macro eNB, and the Macro eNB allocates a C-RNTI for it. Step 2: The macro e B determines whether it is necessary to enable inter-base station aggregation or determine whether to enable bearer separation for the UE or a certain RB of the UE. If enabled, select an appropriate local eNB that participates in inter-base station aggregation or bearer separation according to the measurement of the UE. The inter-base station aggregation request message or the bearer separation request message is sent through the inter-base station interface (the X2 port or the newly introduced inter-base station interface). The content of the C-RNTK DRB related configuration information of the UE is carried in the inter-base station aggregation request message or the bearer separation request.

 Step 3: The local eNB receives the inter-base station aggregation request message or the bearer separation request message, and determines whether there is a C-RNTI collision. If the C-RNTI carried in the inter-base station aggregation request message or the bearer separation request message has been allocated to the local eNB, a certain UE (Crashed UE), the UE that is collided enables inter-base station aggregation or bearer separation, then the Local eNB needs to determine the Macro eNB serving as the victim UE, and notify the Macro eNB to acquire the collided UE through the inter-base station interface. Solve the C-RNTI collision problem in any of the following ways:

 Manner 1: The C-RNTI of the victim UE is replaced by handover, and the handover may be intra-cell or inter-cell handover. Manner 2: Re-assign a new C-RNTL to the victim UE by using RRC signaling or MAC signaling or physical layer signaling.

 Manner 3: Release the RRC connection of the victim UE.

 If the mode 1 or mode 2 is used, the local eNB may carry a C-RNTI or C-RNTI set available under the Local eNB to notify the Macro eNB to change the C-RNTI to indicate that the Macro eNB is the UE that is being collided again. Assigned C-RNTI.

 The mode 3 is generally applicable to the case where the RB of the victim UE has a lower priority.

 Step 4: The Local eNB performs an inter-base station aggregation decision or an RB admission decision to determine whether the inter-base station aggregation or bearer separation can be accepted. If so, the inter-base station aggregate response message or bearer separation response message is sent to the Macro.

 Step 5: The Macro eNB sends RRC reconfiguration signaling to the UE to reconfigure the DRB to Local e B.

 Step 6: The Local eNB uses the Macro eNB to allocate the C-RNTI for its scheduling. The UE performs data transmission at the Local node.

 It should be noted that: the C-RNTI conflict determination and the conflict resolution in step 3 and the RB admission determination in step four can be performed simultaneously, or any one of the steps can be performed preferentially, and the sequence is not strictly specified, but the local eNB needs to be guaranteed in C. - RNTI strives to resolve UEs that cannot previously schedule inter-base station aggregation or bearer separation.

 Example 3:

 Step 1: The UE establishes an RRC connection on the Macro eNB, and the Macro eNB allocates a C-RNTI. Step 2: The Macro eNB determines whether to enable bearer separation for a certain RB of the UE, and if enabled, according to

The measurement of the UE selects an appropriate local eNB that participates in inter-base station aggregation or bearer separation, and passes through the inter-base station interface (X2 port). Or the newly introduced inter-base station interface) sends an inter-base station aggregation request message or a bearer separation request message. The content of the C-RNTI, the DRB related configuration information, and the like of the UE in the inter-base station aggregation request message or the bearer separation request message.

 Step 3: The local eNB receives the inter-base station aggregation request message or the bearer separation request message, and performs the C-RNTI conflict determination. If the C-RNTI carried in the inter-base station aggregation request message or the bearer separation request message has been allocated to the local eNB, UEs (being the UE), then the Local eNB may refuse to accept the separated payload. The admission decision can also be performed before the C-RNTI collision is judged. If the admission decision is not passed, then there is no need to perform the C-RNTI conflict determination step.

 Step 4: The local eNB sends a bearer separation reject message to the Macro eNB. Optionally, the eNB may carry a reject reason, such as a C-RNTI conflict indication, and further indicate one or more available C-RNTIs to the Macro.

 Step 5: The macro eNB receives the bearer separation reject message. If the C-RNTI allocation conflict is included, the C-RNTI of the UE may be changed. The change mode may be intra-cell handover or reconfiguration with C-RRC through RRC signaling or MAC signaling. After the change, the RNTI determines whether to re-initiate the bearer separation request according to the requirements. Of course, if the bearer separation reject message carries the CRNTI indication available to the Local, the Macro can select a non-conflicting C-RNTI to use.

 Example 4:

 Step 1: The UE establishes an RRC connection on the Macro eNB, and the Macro eNB allocates a C-RNTI.

 Step 2: The Macro eNB determines whether the bearer separation is enabled for a certain RB of the UE. If enabled, the local eNB that participates in the inter-base station aggregation or bearer separation is selected according to the measurement of the UE, and the inter-base station interface (X2 port or newly introduced The inter-base station interface sends an inter-base station aggregation request message or a bearer separation request message. The inter-base station aggregation request message or the bearer separation request message carries related configuration information such as a DRB to be separated by the UE. Optionally, a C-RNTI or a set of multiple C-RNTIs available under the Macro eNB may also be carried.

 Step 3: The local eNB receives the inter-base station aggregation request message or the bearer separation request message, and determines the C-RNTI allocated to the bearer separated UE according to the C-RNTI allocation status of the local eNB. Of course, if the inter-base station aggregation request message or the Macro eNB carries the C-RNTI indication information in the bearer separation request message, the information can be referred to when determining the C-RNTI allocation.

 Step 4: The Local eNB performs an admission decision or an inter-base station aggregation decision. If it can be accepted, the inter-base station aggregation response message or the bearer separation response message is sent to the Macro eNB.

 Step 5: After receiving the bearer response message, the Macro eNB extracts the C-RNTI allocated by the Local eNB to the UE, and determines whether it conflicts with the C-RNTI of a certain UE (the collision UE) it serves. If the collision occurs, the Macro eNB may 釆Solve the C-RNTI collision problem in any of the following ways:

Manner 1: The C-RNTI of the victim UE is replaced by handover, and the handover may be intra-cell or inter-cell handover. Manner 2: Re-assign a new C-RNTI to the victim UE by using RRC signaling or MAC signaling.

 Manner 3: Release the RRC connection of the victim UE.

 The mode 3 is generally applicable to the case where the RB of the victim UE has a lower priority.

 Step 6: The Macro eNB sends the RRC reconfiguration signaling to the UE to reconfigure the DRB to the Local eNB, where the C-RNTI that is re-assigned to the victim UE is carried.

 Step 7: The Local eNB uses the Local eNB to allocate the C-RNTI for its scheduling. The UE performs data transmission at the Local node.

 It should be noted that: the C-RNTI allocation in step 3 and the RB admission determination in step 3 may be performed simultaneously, or any one of the steps may be performed preferentially, and the sequence is not strictly specified, but the Macro eNB needs to be guaranteed before scheduling the UE. The collision UE has released or obtained a new C-RNTI.

 Example 5:

 Step 1: The UE establishes an RRC connection on the Macro eNB, and the Macro eNB allocates a C-RNTI. Step 2: The Macro eNB determines whether it is necessary to perform inter-base station aggregation or determine whether to enable bearer separation for a certain RB of the UE. If enabled, select an appropriate local eNB that participates in inter-base station aggregation or bearer separation according to the measurement of the UE, and The interface (the X2 port or the newly introduced inter-base station interface) sends an inter-base station aggregation request message or a bearer separation request message. The inter-base station aggregation request message or the bearer separation request message carries the UE to be separated.

Related configuration information such as DRB. Optionally, one C-RNTI or multiple available under the Macro eNB may also be carried.

A collection of C-RNTIs.

 Step 3: The local eNB receives the inter-base station aggregation request message or the bearer separation request message, and determines the C-RNTI allocated to the bearer separated UE according to the C-RNTI allocation status of the local eNB. Of course, if the inter-base station aggregation request message or the Macro eNB carries the C-RNTI indication information in the bearer separation request message (that is, carries a C-RNTI or a set of multiple C-RNTIs available under the Macro eNB), then the C-RNTI is determined. The information may be referred to in the allocation, that is, the C-RNTI may be selected from a set of C-RNTIs or a plurality of C-RNTIs available under the Macro eNB for branching.

 Step 4: The Local eNB performs an admission decision or an inter-base station aggregation decision. If it is acceptable, the RB bearer separation response message and the newly allocated C-RNTI are fed back to the Macro eNB, or the inter-base station aggregation response message and the newly allocated C-RNTI are fed back. .

 Step 5: After receiving the bearer response message, the Macro eNB extracts the C-RNTI allocated by the Local eNB to the UE, and determines whether it conflicts with a certain UE (the collided UE) it serves. If the collision occurs, it determines that the bearer separation fails. Optionally, you can also notify Local to end the bearer separation.

Step 6: Optionally, the Macro eNB may also re-allocate the UE by using intra-cell handover or reconfiguration. C-RNTI, and try RB separation again.

 A cell wireless network temporary identifier C-RNTI allocation system, including user equipment, provided by an embodiment of the present invention

a first base station and a second base station aggregated by the UE; wherein

 a first base station, configured to allocate a C-RNTI to the UE; and send, by using an inter-base station interface, a C-RNTI allocated to the UE to the second base station participating in the aggregation;

 The second base station is configured to receive a C-RNTI allocated by the first base station to the UE.

 Preferably, the first base station is a base station that initiates a bearer separation or accepts a bearer separation request.

 Preferably, the second base station is further configured to: determine whether there is a collision UE in the second base station, where the C-RNTI corresponding to the collided UE, and the C- allocated by the first base station received by the second base station to the UE The RNTI is the same; when there is a collision UE, the C-RNTI of the victim UE is replaced; or, the radio resource control RRC connection of the collided UE is released; or the same C-RNTI initiated by the first base station and used by the collided UE is rejected. Inter-base station aggregation request for the UE.

 Preferably, when there is a collision UE, the second base station replaces the C-RNTI of the victim UE, specifically: the second base station replaces its C-RNTI by performing intra-cell or inter-cell handover on the victim UE; or, The second base station updates the C-RNTI of the victim UE by RRC signaling or MAC signaling or physical layer signaling, or

 If the radio bearer RB of the victim UE is separated into the second base station by the bearer separation process, the second base station notifies the base station that allocates the C-RNTI for the victim UE to be replaced with the C-RNTI allocated by the collided UE, and The base station indicates a complete set or subset of C-RNTIs currently available to the second base station.

 Preferably, when there is a collision UE, the second base station releases the radio resource control RRC connection of the victim UE, including:

 The second base station directly sends an RRC connection release message to notify the UE to release the RRC connection; or

 If the radio bearer RB of the victim UE is separated into the second base station by the bearer separation process, the second base station notifies the base station that allocates the C-RNTI to the UE that is collided to release the RRC connection of the UE.

 In summary, when the UE aggregates resources of multiple base stations, one of the base stations allocates a C-RNTI to it, and then interacts with other base stations participating in the aggregation through the inter-base station interface. For the base station participating in the aggregation, if the C-RNTI and the C-RNTI of other UEs served by the base station (the collision UE) collide, the base station is responsible for solving the C-RNTI collision problem. Therefore, the present invention provides a C-RNTI method based on contention when the UE aggregates multiple base station resources, and solves the problem of how to allocate C-RNTI when the UE aggregates multiple base station resources.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be applied to one or more computers in which computer usable program code is included. A form of computer program product embodied on a storage medium (including but not limited to disk storage and optical storage, etc.).

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

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

 These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

 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

Rights request 1. A method for allocating a cell wireless network temporary identity C-RNTI, characterized in that the method includes: When the user equipment UE aggregates resources of multiple base stations, the first base station among them allocates the C-RNTI to the UE. ; The first base station sends the C-RNTI allocated for the UE to the second base station participating in the aggregation through the inter-base station interface. 2. The method according to claim 1, characterized in that, the first base station is any base station aggregated by the UE or a base station that maintains the RRC connection of the UE; and the second base station is other than the first base station aggregated by the UE. of other base stations. 3. The method according to claim 1, characterized in that, the method further includes: The second base station determines whether there is a collided UE under the second base station, wherein the C-RNTI corresponding to the collided UE is the same as the C-RNTI allocated to the UE by the first base station received by the second base station; When there is a collided UE, the second base station replaces the C-RNTI of the collided UE; or, releases the collided UE. The radio resource control RRC connection of the UE; or, reject an inter-base station aggregation request initiated by the first base station for a UE that uses the same C-RNTI as the collided UE. 4. The method according to claim 3, characterized in that the second base station replaces the C-RNTI of the collided UE, including: The second base station replaces the C-RNTI of the collided UE by performing intra-cell or inter-cell handover of the collided UE; or, the second base station updates the C-RNTI of the collided UE through RRC signaling or MAC signaling or physical layer signaling. RNTI, or, If the C-RNTI of the collided UE is not allocated by the second base station, the second base station notifies the base station that allocated the C-RNTI to the collided UE to change it to the C-RNTI allocated by the collided UE, and sends the C-RNTI to the collided UE. The base station indicates the full set or a subset of C-RNTIs currently available to the second base station. 5. The method according to claim 3, wherein the second base station releases the RRC connection of the collided UE, including: The second base station directly sends an RRC connection release message to notify the UE to release the RRC connection; or, if the RRC connection of the collided UE is not maintained at the second base station, the second base station notifies the base station maintaining the RRC connection of the collided UE to release it. RRC connection of this UE. 6. A cell wireless network temporary identifier C-RNTI allocation system, characterized in that the system includes a first base station and a second base station aggregated by user equipment UE; wherein, The first base station is used to allocate C-RNTI to the UE; and, send the C-RNTI allocated to the UE to the second base station participating in the aggregation through the inter-base station interface; The second base station is configured to receive the C-RNTI assigned by the first base station to the UE. 7. The system according to claim 6, characterized in that the first base station is any base station aggregated by UE. station or a base station that maintains the RRC connection of the UE; the second base station is another base station other than the first base station aggregated by the UE. 8. The system according to claim 6, wherein the second base station is further configured to: determine whether there is a collided UE under the second base station, wherein the C-RNTI corresponding to the collided UE is The C-RNTI allocated to the UE by the first base station received by the second base station is the same; when there is a collided UE, replace the C-RNTI of the collided UE; or, release the radio resource control RRC connection of the collided UE; or, reject An inter-base station aggregation request for a UE using the same C-RNTI as the collided UE initiated by the first base station. 9. The system according to claim 8, characterized in that when there is a collided UE, the second base station replaces the C-RNTI of the collided UE, specifically for: The second base station changes the C-RNTI of the collided UE by performing intra-cell or inter-cell handover for the collided UE; or, the second base station updates the C-RNTI of the collided UE through RRC signaling or MAC signaling or physical layer signaling, or, If the C-RNTI of the collided UE is not allocated by the second base station, the second base station notifies the base station that allocated the C-RNTI to the collided UE to change it to the C-RNTI allocated by the collided UE, and sends the C-RNTI to the collided UE. The base station indicates the full set or a subset of C-RNTIs currently available to the second base station. 10. The system according to claim 8, characterized in that when there is a collided UE, the second base station releases the radio resource control RRC connection of the collided UE, specifically for: The second base station directly sends an RRC connection release message to notify the UE to release the RRC connection; or, if the RRC connection of the collided UE is not maintained at the second base station, the second base station notifies the maintenance of the collided UE. The base station to which the UE is RRC connected releases the RRC connection of the UE.