WO2013010393A1 - 一种回传链路中断时中继节点管理用户设备的方法和系统 - Google Patents

一种回传链路中断时中继节点管理用户设备的方法和系统 Download PDF

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Publication number
WO2013010393A1
WO2013010393A1 PCT/CN2012/074557 CN2012074557W WO2013010393A1 WO 2013010393 A1 WO2013010393 A1 WO 2013010393A1 CN 2012074557 W CN2012074557 W CN 2012074557W WO 2013010393 A1 WO2013010393 A1 WO 2013010393A1
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Prior art keywords
cell
denb
rrc connection
release
ues
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Application number
PCT/CN2012/074557
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English (en)
French (fr)
Inventor
王昕�
褚丽
Original Assignee
中兴通讯股份有限公司
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Publication of WO2013010393A1 publication Critical patent/WO2013010393A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates to a technique for a relay node to manage a user equipment, and more particularly to a method and system for a relay node to manage a user equipment when a backhaul link is interrupted.
  • the UE In the communication system, after the User Equipment (UE) successfully accesses the evolved NodeB (eNB), it is in the Radio Resource Control CONNECTED (RRC-CONNECTED) state, that is, the RRC connected state, otherwise the UE It is in the radio resource control idle state (RRC_IDLE), that is, the RRC idle state.
  • RRC-CONNECTED Radio Resource Control CONNECTED
  • RRC_IDLE radio resource control idle state
  • the UE In order to meet the mobility requirement in the mobile communication system, after the UE in the RRC connected state establishes a connection with the network in the serving cell, the UE still needs to measure the signal quality of the serving cell and the neighboring cell, so as to select more. Switch for a suitable cell to get better service.
  • FIG. 1 is a schematic diagram of a process for a UE to perform handover in the prior art. As shown in FIG. 1 , it should be noted that FIG. 1 is an example of an X2 handover between base stations, and an approximate flow of the S1 handover is similar.
  • the process specifically includes: Step 101: The source base station configures the UE to perform measurement, and prepares to switch;
  • the source base station configures the UE to perform measurement on the serving cell and some neighboring cells, and determines, according to the measurement result reported by the UE, that it is to be switched to a suitable cell (ie, a target cell) under a neighboring base station (ie, the target base station). Then, the source base station sends a handover request message to the target base station, and notifies the other party of the resource situation and the like required by the UE, so that the target base station determines whether the UE can be admitted, and if the resource condition of the target base station allows the UE to access, the target The base station returns a handover request acknowledgement message to the source base station, and the handover preparation phase is completed.
  • a suitable cell ie, a target cell
  • a neighboring base station ie, the target base station
  • Step 102 The source base station instructs the UE to detach from the source cell. Specifically, the source base station sends an RRC Connection Reconfiguration message including the mobile control information to the UE according to the received handover request acknowledgement message from the target base station, and notifies the UE of the mobile handover procedure to be performed, and the UE receives the message. Then detach from the source cell.
  • Step 103 The UE accesses the target cell, and the handover execution phase is completed.
  • the UE synchronizes with the target cell and attempts to access the target cell. After the access succeeds, the UE sends an RRC Connection Reconfiguration Complete message to the target base station, and the handover execution phase is completed. During this period, since the network element of the core network has not been notified to update the handover related information, the downlink data packet sent by the Serving Gateway (S-GW) still arrives at the source base station, and the source base station will receive the data packet itself. Forward to the target base station to avoid loss of data packets.
  • S-GW Serving Gateway
  • Step 104 The target base station notifies the core network side to update data, starts receiving downlink data of the UE from the core network side, and forwards the data to the UE, and the handover completion phase ends.
  • the path conversion and the user plane update procedure are performed between the target base station and the Mobility Management Entity (MME) and the S-GW on the core network side.
  • MME Mobility Management Entity
  • the S-GW sends an end marker to the source base station, and the source base station does not forward the downlink data packet to the target base station.
  • the S-GW sends the downlink data packet to the target base station.
  • the target base station informs the source base station to release the context of the UE, which marks the end of the handover completion phase and also the end of the entire handover procedure.
  • the RRC message in the above process belongs to the dedicated signaling, that is, the base station is sent for each UE, for example, each message that schedules a certain UE to perform handover in the above process.
  • the base station For another type of public information that needs to be transmitted to all UEs in a certain geographical area (such as a certain cell), the base station will adopt a broadcast mode, and this information is also called a system message.
  • the system message has a corresponding change period.
  • the base station may send a certain system message multiple times during a change period to try to make all UEs in the geographical area successfully received.
  • the UE receives the updated system message within a change period, in the next change
  • the cycle begins to perform the corresponding operations in accordance with the content indicated by the system message.
  • a wireless relay node can be deployed in the network, which aims to expand the coverage of the cell, reduce the dead zone in the communication, balance the load, transfer the traffic in the hotspot area, and save the UE. Transmit power.
  • 2 is a schematic diagram of a network structure using a wireless relay technology. As shown in FIG. 2, the RN 21 provides similar functions and services to the UE 22 accessing its cell, and the wireless interface between the RN 21 and the UE 22 is called an access chain.
  • RN21 accesses a base station 23 serving it in a manner similar to the normal UE 24 through a radio interface, and the base station 23 serving the RN 21 is called a donor base station (Dorant eNB, DeNB).
  • the radio interface between the RN 21 and the base station 23 is called a backhaul link, and is also called a Un interface or an Un port.
  • the DeNB implements the functions of the S-GW and the Packet Data Network Gateway (P-GW) for the RN proxy, and the S-GW and the P-GW are located in the infrastructure. Core Network.
  • the transmission message between the RN and the MME or other neighboring base stations is forwarded through the transparent transmission or processing of the DeNB. That is to say, the wireless Un port connected to the DeNB not only transmits wireless messages, such as RRC messages, but also transmits Sl and X2 messages belonging to the wired transmission in the original basic network architecture.
  • the DeNB also has the S1 and X2 interface information related to the UE served by the RN, for example: S1 Application Layer Identity (SI-AP Identity), X2 Application Identity (X2 Application Identity, X2 AP ID), and The MME identifies information such that the UE served by the RN implements communication with other network elements or performs cell handover by itself.
  • SI-AP Identity S1 Application Layer Identity
  • X2 Application Identity X2 Application Identity
  • X2 AP ID X2 Application Identity
  • the MME identifies information such that the UE served by the RN implements communication with other network elements or performs cell handover by itself.
  • the RN may interrupt the wireless connection with the DeNB, that is, the Un port, temporarily or long-term exiting the network.
  • the interrupt of the Un port will involve the UE connected to the RN, that is, the RN cannot provide services such as communication with other network elements for these UEs.
  • the UE is unknown, and may continue to wait for receiving downlink signaling or requesting uplink information transmission. The source, until the detection or request is unsuccessful, can the radio link fail to be discovered. This will cause a lot of redundant signaling transmission, and also increase the delay for the UE to access other base stations to obtain services. Summary of the invention
  • the main purpose of the embodiments of the present invention is to provide a method and system for a relay node to manage a user equipment when the backhaul link (ie, the Un port) is interrupted, which can prevent the user equipment from failing in the relay node.
  • the resource that continuously receives the downlink signaling or requests the uplink information transmission is not found until the detection or the request is unsuccessful.
  • the embodiment of the invention provides a method for a relay node (RN) to manage a user equipment (UE) when the backhaul link is interrupted, and the method includes:
  • the RN schedules its serving UE to switch to another suitable cell, or informs the UE to release the Radio Resource Control (RRC) connection;
  • RRC Radio Resource Control
  • the host base station learns that the UE served by the RN has left the RN cell, it disconnects the backhaul link with the RN.
  • the method for the DeNB to learn that the UE served by the RN has left the RN cell includes: after the UE is detached from the source cell, or after the UE successfully switches to the suitable cell, the RN returns an RRC connection release confirmation message to notify the DeNB, All UEs have left the RN cell; or
  • the setting of the timer duration includes:
  • the method for the RN to learn to disconnect the backhaul link includes: receiving, by the RN, an RRC connection release message sent by the DeNB.
  • the notifying the UE to release the RRC connection includes: sending a dedicated RRC connection release message to each UE separately; or sending a broadcast message informing the UE to release the RRC connection to all UEs in the RN cell.
  • the scheduling of the serving UE to the other suitable cell includes: scheduling the UE to switch to another suitable cell according to the measurement result of the UE measurement, where the other suitable cell includes: a cell served by a serving DeNB, or a cell served by another RN served by the RN for the RN, or serving the RN
  • the cell served by the neighboring base station of the DeNB The cell served by the neighboring base station of the DeNB.
  • the embodiment of the present invention further provides a system for a relay node to manage a user equipment when the backhaul link is interrupted, where the system includes: a DeNB, an RN subordinate to the DeNB, and one or more UEs, where
  • the RN is configured to: when the backhaul link needs to be disconnected, the UE that schedules its service switches to another suitable cell, or notifies the UE to release the RRC connection;
  • the DeNB is configured to disconnect the backhaul link with the RN after the UE that the RN serves has left the RN cell.
  • the method for the DeNB to learn that the UE served by the RN has left the RN cell includes: after the UE is detached from the source cell, or after the UE successfully switches to the suitable cell, the RN returns an RRC connection release confirmation message to notify the DeNB, All UEs have left the RN cell; or
  • the setting of the timer duration includes:
  • the method for the RN to learn to disconnect the backhaul link includes: receiving, by the RN, an RRC connection release message sent by the DeNB.
  • the notifying the UE to release the RRC connection includes: sending a dedicated RRC connection release message to each UE separately; or sending a broadcast message informing the UE to release the RRC connection to all UEs in the RN cell.
  • the scheduling of the serving UE to the other suitable cell includes: scheduling the UE to switch to another suitable cell according to the measurement result of the UE measurement, where the other suitable cell includes: The cell served by the serving DeNB, or the cell served by the other RN served by the DeNB of the RN, or the cell served by the neighboring base station of the DeNB serving the RN.
  • the RN schedules the UE to serve to switch to another suitable cell, or notify the UE The RRC connection is released.
  • the DeNB learns that the UE served by the RN has left the RN cell, the DeNB disconnects the backhaul link with the RN.
  • the UE is notified to perform the handover or release the RRC connection, so that the UE can quickly access the appropriate cell, reduce the transmission of the redundant signaling, ensure good mobility, and improve the user experience. .
  • FIG. 1 is a schematic flowchart of a UE performing handover in the prior art
  • FIG. 2 is a schematic diagram of a network structure using a wireless relay technology
  • FIG. 3 is a schematic flowchart of a method for a relay node to manage a user equipment when an Un port is interrupted according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a first embodiment of a relay node management user equipment according to the present invention.
  • FIG. 5 is a flowchart of a second embodiment of a relay node managing user equipment when the Un interface is interrupted according to the present invention
  • FIG. 6 is a schematic flowchart of a third embodiment of a relay node management user equipment according to the present invention.
  • FIG. 7 is a schematic flowchart of a fourth embodiment of a relay node managing user equipment according to the present invention.
  • FIG. 8 is a schematic diagram showing the system structure of a relay node managing a user equipment when an Un port is interrupted according to an embodiment of the present invention. detailed description
  • the basic idea of the embodiment of the present invention is: when the backhaul link needs to be disconnected, the RN schedules the UE to serve to switch to another suitable cell, or informs the UE to release the RRC connection; after the DeNB learns that the UE served by the RN has left the RN cell, Disconnect the backhaul link with the RN.
  • FIG. 3 is a schematic flowchart of a method for a relay node to manage a user equipment when an Un port is interrupted according to an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:
  • Step 301 When the backhaul link needs to be disconnected, the RN schedules the UE that serves the service to switch to another suitable cell, or notifies the UE to release the RRC connection;
  • the method for the RN to learn to disconnect the backhaul link includes: receiving, by the RN, an RRC Connection Release message sent by the DeNB.
  • the UE that schedules its service to switch to another suitable cell includes: scheduling the UE to switch to another suitable cell according to the UE measurement report result.
  • the other suitable cell includes: a cell served by a DeNB served by the RN, or a cell served by another RN served by the RN, or a neighboring base station of a DeNB serving the RN The community served.
  • After confirming the message send an RRC connection to the UE.
  • the RRC Connection Reconfiguration message is detached from the source cell after the UE receives it.
  • the notifying the UE to release the RRC connection includes: sending a dedicated RRC connection release message to each UE respectively; or sending a broadcast message to all UEs in the RN cell to inform them to release the RRC connection.
  • Step 302 After the DeNB learns that the UE served by the RN has left the RN cell, the DeNB disconnects the backhaul link with the RN.
  • the disconnecting link between the RN and the RN is specifically: the RN continues the RRC connection to release the next process, or directly powers off; the DeNB receives the acknowledgment message or the timer expires.
  • the uplink and downlink services between the RN and the RN are stopped, and the context of the RN and the UE may be released.
  • the method for the DeNB to learn that the UE served by the RN has left the RN cell includes: after the UE is detached from the source cell, or after the UE successfully switches to the suitable cell, the RN returns an RRC Connection release Ack.
  • the message informs the DeNB that all UEs have left the RN cell; or after the preset timer expires, the DeNB learns that the UE served by the RN has left the RN cell.
  • the setting of the timer duration includes: an average time suitable for detaching all UEs from the RN cell in the handover process; or an average of all UEs that have completed handover, that is, UEs that fail during handover, and then perform cell reselection. Time; or it is suitable to inform all UEs when to release the RRC connection.
  • the RN After the UE is detached from the source cell, the RN returns an RRC connection release confirmation message to notify the DeNB that all UEs have left the RN cell. In this case, the required feedback time is short, and the RN is relatively simple, but because of the RN direction. After the DeNB replies with the acknowledgment message, the wireless connection with the DeNB is interrupted, which may result in loss of data packets.
  • the RN After the UE successfully switches to the suitable cell, the RN returns an RRC connection release confirmation message to notify the DeNB that all UEs have left the RN cell. In this case, the RN receives the UE with the last handover procedure in step 104 shown in FIG. Context release message, the time required for this UE-wide handover process to completely end the scenario Longer, but the RN can forward the packet to the target base station to avoid packet loss. It is further noted that, before the DeNB learns that the RN serving UE has left the RN cell, the method further includes: the DeNB maintains a wireless connection with the RN, that is, saves the S1AP ID, the X2AP ID, and the MME related to the UEs. Identification and other information to ensure the smooth progress of the UE handover process.
  • the Un port interruption between the RN and the DeNB will affect the UE under it. Otherwise, the RN leaves the RRC-CONNECTED behavior as normal. UE-like. If the RRC connection between the RN and the DeNB needs to be interrupted due to the deployment of the operator or other network requirements, the DeNB sends an RRC Connection Release message to the RN.
  • the cell of the target base station is a suitable cell selected by the RN to switch to the UE to which the RN belongs.
  • an RN that is serving the UE may be A temporary or long-term interruption of the wireless connection with the DeNB.
  • the DeNB needs to send an RRC Connection Release message to the RN.
  • the RN schedules its serving UE to switch to a suitable cell under other base stations.
  • the RN replies to the DeNB with an RRC Connection Release Ack message, before the DeNB needs to maintain a normal wireless connection with the RN.
  • the specific process is:
  • Step 401 Based on the deployment of the operator or some requirements of the network (such as replacing the MME for the RN for load balancing purposes), a RN that is serving the UE may interrupt the wireless connection with the DeNB, and the DeNB Sending an RRC Connection Release message to the RN;
  • Step 402 After receiving the RRC Connection Release message, the RN according to the UE under the UE The measurement reporting result schedules the UEs to switch to the cells of the respective other base stations; specifically, the RN sends a handover request message to the target base station to notify the UE of the required resource occupation, and the target base station allows the UE to access the RN. Responding to the handover request acknowledgement message, the RN sends an RRC Connection Reconfiguration message to the UE according to the content of the message, and the UE can be detached from the source cell after receiving the message.
  • Step 403 After the last UE to be RN service is detached from the source cell, the RN returns an RRC Connection Release Ack message to the DeNB to notify the DeNB that all UEs in the RN have left the RN cell, and the RN is like a normal UE. Continue the RRC connection to release the next process.
  • the DeNB needs to maintain a normal wireless connection with the RN, that is, the information about the S1AP ID, the X2AP ID, and the MME identity associated with the UEs is also saved, so as to ensure the smooth handover of the UE handover procedure.
  • the RN may reply to the UE to send an RRC Connection Reestablishment Reject message, and the UE receives the message. Then execute the program leaving RRC-CONNECTED.
  • FIG. 5 is a schematic flowchart of a second embodiment of a relay node management user equipment according to the present invention.
  • the RN schedules the UE under the UE to switch to another base station. A suitable cell.
  • the RN replies to the DeNB with an RRC Connection Release Ack message, before the DeNB needs to maintain a normal wireless connection with the RN.
  • the specific process is:
  • Step 501 If a RN that is serving the UE needs to be disconnected from the radio connection with the DeNB, the DeNB needs to send an RRC Connection Release message to the RN.
  • Step 502 After receiving the RRC Connection Release message, the RN schedules, according to the measurement report result of the UE, the UE to switch to the cell under the other suitable base stations;
  • the RN and the target base station first coordinate the resources for handover preparation, and the handover is performed after the target base station agrees to accept the UE.
  • the target base station In the handover completion phase, the target base station notifies the information such as the update path and the user plane between the network elements such as the MME and the S-GW located on the core network side. After the entire handover process ends, the target base station informs the source base station to release the context of the UE.
  • Step 503 After all the UEs to be served by the RN have completed the handover, the RN returns an RRC Connection Release Ack message to the DeNB, where the DeNB needs to maintain a normal wireless connection with the RN, that is, the S1AP ID associated with the UEs is also saved. Information such as the X2AP ID and the MME identity to ensure the smooth completion of the UE handover procedure, and the RN continues the RRC connection as the normal UE to release the next procedure.
  • the RN may send an RRC Connection Reestablishment Reject message to the UE, and the UE may perform the procedure of leaving the RRC_CONNECTED, if the RN is to re-select the radio connection with the DeNB and close the cell. If the UE reselects to other cells, the RN's own related timer will time out.
  • the exact moment when the RN replies to the DeNB with the RRC Connection Release Ack message should be that all the UEs it serves have completed the handover successfully, that is, the message that the UE context is released; or fails, that is, the RRC Connection Reestablishment Rej ect message or the timing is replied. Timeout, the time after the program.
  • FIG. 6 is a schematic flowchart of a third embodiment of a relay node managing user equipment according to the present invention.
  • the RN can schedule the UE to be served to switch to another base station.
  • the appropriate cell is either directly released or the RRC connection with these UEs is released.
  • the DeNB may preset a timer, which is enabled when the DeNB sends an RRC Connection Release message to the RN, and times out after the preset time arrives. When the timer expires, the DeNB considers that the RN has switched or released the UE it serves, if Executing is switching The procedure, before which the DeNB needs to maintain a normal wireless connection with the RN.
  • Step 601 If a RN that is serving the UE needs to be disconnected from the DeNB, the DeNB needs to send an RRC Connection Release message to the RN, and the DeNB presets a timer, when the DeNB sends the message. , the timer starts timing;
  • Step 602 After receiving the RRC Connection Release message, the RN switches the UEs it serves to the cells under the other suitable base stations or releases the RRC connection with the UE.
  • Step 603 After the timer of the DeNB expires, the RN considers that the RN completes the handover or releases the UE it serves, and then continues the RRC connection to release the next procedure as the normal UE.
  • the duration of the timer in the DeNB may be three options, one is an average time suitable for all UEs to be detached from the source RN in the handover process; the second is an average time suitable for all UEs to complete handover; and the third is suitable for notifying all UEs.
  • the time to release the RRC connection If the RN is selected to switch the served UE to the appropriate cell under the other base station after receiving the RRC Connection Release message, the DeNB needs to maintain a normal wireless connection with the RN before the timer expires, that is, the UE is also saved. Information such as the S1AP ID, the X2AP ID, and the MME identity to ensure smooth handover of the UE handover procedure.
  • the UE may not perform the handover, and the RN may release the UEs or provide them no longer.
  • the service of the base station class, that is, the RN has only the UE identity, so that the UE itself knows that the radio link fails and returns to the RRC-IDLE state.
  • FIG. 7 is a schematic flowchart of a fourth embodiment of a relay node management user equipment according to the present invention.
  • the RN after receiving the RRC Connection Release message sent by the DeNB, the RN can directly notify the UE that it serves to release the RRC connection. This message notifying the UE that the RRC connection is released may be a dedicated or public message.
  • the RN may reply to the DeNB after the release of the RRC Connection Release Ack message, or may preset a timer for the UE to receive the notification message in the DeNB (for example, the process described in Embodiment 3)
  • the specific process is:
  • Step 701 If a RN that is serving the UE needs to be disconnected from the wireless connection between the DeNB, the DeNB needs to send an RRC Connection Release message to the RN.
  • Step 702 After receiving the RRC Connection Release message, the RN directly releases the RRC connection between all UEs served by the RN;
  • the RN deployed at the edge of the cell even if the RN barely selects the target cell to the target cell, that is, the foregoing suitable cell, the probability of success of the handover is not high, or the cell is newly selected after the handover.
  • the release message There are two options for sending the release message, one is to separately send an existing dedicated RRC Connection Release message to each UE; the other is to add a public system message, which broadcasts to all UEs in the RN cell. After receiving the system message, the UE knows that the serving base station wants to release the RRC wireless connection with itself, and then leaves RRC_CONNECTED at the beginning of the next change period related to the system message.
  • Step 703 The RN completes the UE that releases its service, and then continues the RRC connection to release the next process as the normal UE.
  • the DeNB may set the duration of the timer according to the change period of the system message broadcast by the RN, when the next change period of the broadcasted system message arrives. The timer is also timed out; or a time suitable for the RN to send a dedicated RRC Connection Release message to all UEs. If the scheme of replying the acknowledgment message is adopted, the RN may reply the RRC Connection Release Ack message to the DeNB after the start of the next change period after the broadcast system message or after the dedicated RRC Connection Release message has been sent to all UEs. After the RN informs the UEs of its service that it is released, it continues the RRC connection and releases the next procedure like the normal UE.
  • modules or steps of the present invention can be implemented by a general computing device, which can be concentrated on a single computing device, or Distributed over a network of computing devices, optionally, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device for execution by the computing device, or separately
  • the individual integrated circuit modules are implemented, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • FIG. 8 is a schematic structural diagram of a system for a relay node to manage a user equipment when an Un port is interrupted according to an embodiment of the present invention.
  • the system includes: a DeNB 81, an RN 82 subordinate to the DeNB 81, and one or more UEs 83, where
  • the RN 82 is configured to: when the backhaul link needs to be disconnected, the UE 83 that schedules its service switches to another suitable cell, or notifies the UE 83 to release the RRC connection;
  • the method for the RN 82 to know that the backhaul link needs to be disconnected includes: The RN 82 receives the RRC connection release message sent by the DeNB 81.
  • the UE 83 that schedules its service to switch to another suitable cell includes: according to the UE 83 measuring the report result, the scheduling UE 83 switches to another suitable cell.
  • the other suitable cell includes: a cell served by the DeNB 81 served by the RN 82, or a cell served by another RN 82 served by the DeNB 81 served by the RN 82, or a neighbor of the DeNB 81 serving the RN 82.
  • the RN 82 sends a handover request message to the base station of the suitable cell, and notifies the UE of the resource occupancy required by the UE 83.
  • the target base station allows the UE 83 to access, and then returns a handover request acknowledgement message to the RN 82, and the RN 82 receives the handover request. After the acknowledgment message, an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message is sent to the UE 83, and the UE 83 detaches from the source cell after receiving it.
  • RRC Connection Reconfiguration RRC Connection Reconfiguration
  • the notifying the UE 83 to release the RRC connection includes: transmitting a dedicated RRC connection release message to each UE 83 respectively; or transmitting a broadcast message to all UEs 83 in the RN82 cell, informing them to release the RRC connection.
  • the DeNB 81 is configured to learn that the UE 83 served by the RN 82 has left the RN 82 responsible for the small After the zone, the backhaul link with the RN 82 is disconnected.
  • the disconnecting link between the RN and the RN 82 is specifically: the RN 82 continues the RRC connection to release the next process, or directly powers off, like the normal UE; after receiving the acknowledgment message or the timer expires, the DeNB 81
  • the uplink and downlink services with the RN 82 are stopped, or the context of the RN 82 and the UE is released.
  • the method for the DeNB 81 to learn that the UE 83 served by the RN 82 has left the cell that the RN 82 is responsible for includes: after the UE 83 is detached from the source cell, or after the UE 83 successfully switches to the suitable cell, the RN 82 returns an RRC Connection Release Confirmation (RRC Connection release).
  • the Ack) message informs the DeNB 81 that all the UEs 83 have left the cell in which the RN 82 is responsible; or after the preset timer expires, the DeNB 81 learns that the UE 83 served by the RN 82 has left the cell in which the RN 82 is responsible.
  • the setting of the timer duration includes: an average time for all UEs 83 to be detached from the source RN 82 in the handover process; or suitable for all UEs 83 to be switched, that is, the UE 83 that fails during the handover process performs cell reselection, etc. Average time; or suitable to notify all UEs 83 of the time to release the RRC connection.
  • the RN 82 After the UE 83 is detached from the source cell, the RN 82 returns an RRC connection release confirmation message to notify the DeNB 81 that all the UEs 83 have left the cell responsible for the RN 82.
  • the required feedback time is short, which is relatively simple for the RN 82, but After the RN 82 returns an acknowledgement message to the DeNB 81, the wireless connection with the DeNB 81 is interrupted, which may result in loss of data packets. After the UE 83 successfully switches to the suitable cell, the RN 82 returns an RRC connection release confirmation message to notify the DeNB 81 that all the UEs 83 have left the cell responsible for the RN 82. In this case, the RN 82 receives the UE 83 context release message that the last handover procedure ends. The scheme in which all UE83 handover procedures are completely completed requires a longer time, but the RN can forward the data packet to the target base station to avoid packet loss.
  • the method further includes: the DeNB 81 maintains a wireless connection with the RN 82, that is, saves the S1AP ID and the X2AP ID associated with the UEs 83. And MME logo and other letters Interest, to ensure the smooth progress of the UE83 handover process.
  • the Un port interruption between the RN 82 and the DeNB 81 will affect the UE 83 under it, and the behavior of the 'J RN 82 leaving the RRC-CONNECTED Just like a normal UE. If the RRC connection between the RN 82 and the DeNB 81 needs to be interrupted due to the deployment of the operator or other network requirements, the DeNB 81 sends an RRC Connection Release message to the RN 82.

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Abstract

本发明公开了一种回传链路中断时中继节点（RN）管理用户设备（UE）的方法和系统。其中方法包括：需要断开回传链路时，RN调度其服务的UE切换到其他适合的小区，或者通知UE释放无线资源控制（RRC）连接（301）；宿主基站（DeNB）获知RN服务的UE已经离开RN小区后，断开与RN间的回传链路（302）。根据本发明的技术方案，在RN断开回传链路前通知UE进行切换或者释放RRC连接，使得UE能够快速接入合适的小区，减小冗余信令的发送，保证良好的移动性能，提升用户的使用感受。

Description

一种回传链路中断时中继节点管理用户设备的方法和系统 技术领域
本发明涉及中继节点管理用户设备的技术， 特别是指一种回传链路中 断时中继节点管理用户设备的方法和系统。 背景技术
在通信系统中，用户设备 ( User Equipment, UE )成功接入基站（ evolved NodeB, eNB )后， 则处于无线资源控制连接态 （Radio Resource Control CONNECTED, RRC— CONNECTED ), 即 RRC连接态， 否则 UE处于无线 资源控制空闲态（ RRC— IDLE ), 即 RRC空闲态。 为了在移动通信系统中满 足移动性的需求， 当处于 RRC连接态的 UE在服务小区中与网络建立连接 后， UE仍然需要对服务小区和相邻小区的信号质量等方面进行测量， 以便 选择更为合适的小区进行切换， 从而获得更好的服务。 其中， 所述服务小 区在切换过程中也称作源小区， 源小区的负责基站为源基站。 图 1 为现有 技术中 UE进行切换的流程示意图，如图 1所示， 需要说明的是图 1是以基 站间的 X2切换为例， S1切换的大致流程与此类似。 所述流程具体包括： 步驟 101 , 源基站配置 UE进行测量， 并准备切换；
具体的， 源基站配置 UE对服务小区和某些相邻小区进行测量， 根据 UE上报的测量结果决定要将其切换到某相邻基站（即目标基站 )下的适合 的小区 （即目标小区）， 那么源基站向目标基站发送切换请求消息， 通知对 方该 UE所需占用的资源情况等信息，以使得目标基站决定是否可以接纳该 UE, 如果目标基站的资源情况等允许该 UE接入， 目标基站即向源基站回 复切换请求确认消息， 切换准备阶段完成。
步驟 102, 源基站指示 UE从源小区去附着； 具体的， 源基站根据接收到的来自目标基站的切换请求确认消息向 UE 发送包含移动控制信息的 RRC 连接重配置 （ RRC Connection Reconfiguration ) 消息， 通知 UE应执行的移动切换程序， UE收到该消息 后从源小区去附着 （ detach )。
步驟 103 , UE接入目标小区， 切换执行阶段完成；
具体的， UE与目标小区同步并尝试接入目标小区， 接入成功后向目标 基站发送 RRC连接重配置完成（ RRC Connection Reconfiguration Complete ) 消息， 切换执行阶段完成。 在此期间， 因还未通知核心网的网元更新切换 相关信息， 因此由服务网关（Serving Gateway, S-GW )发送的下行数据包 仍到达源基站， 则源基站将自己接收到的数据包转发给目标基站以免数据 包的丟失。
步驟 104, 目标基站通知核心网侧更新数据， 开始从核心网侧接收所述 UE的下行数据， 并转发给 UE, 切换完成阶段结束。
具体的 , 目标基站与核心网侧的移动性管理实体 ( Mobility Management Entity, MME )和 S-GW间执行路径转换与用户面更新程序。此过程中 S-GW 向源基站发送终止标识（ End marker ), 源基站收到后即不再向目标基站转 发下行数据包。核心网的网元信息更新后， S-GW即将下行数据包发送给目 标基站。 目标基站通知源基站释放该 UE的上下文，这标志着切换完成阶段 的结束， 也是整个切换程序的结束。
上述流程中的 RRC消息属于专用信令，即基站是针对每个 UE发送的， 例如上述过程中调度某一 UE执行切换的各条消息。对于另一类需要传输给 某个地理区域（如某小区）内所有 UE的公用信息，基站会采取广播的方式， 这些信息也称为系统消息。 系统消息有相应的变更周期， 基站在一个变更 周期内可能多次发送某系统消息，以尽量使得该地理区域内的所有 UE都能 成功接收到。 UE在某一变更周期内接收到更新的系统消息， 在下一个变更 周期开始按照该系统消息指示的内容来执行相应的操作。
随着通信系统的演进， 网络中可以部署无线中继节点 （Relay Node, RN ),其目的在于扩展小区的覆盖范围、减少通信中的死角地区、平衡负载、 转移热点地区的业务和节省 UE的发射功率。图 2是利用无线中继技术的网 络结构示意图， 如图 2所示， RN21对接入其小区的 UE22提供与普通基站 23类似的功能和服务， RN21和 UE22间的无线接口称为接入链路（ Access Link ), 也称为 Uu接口； RN21又通过无线接口以类似于普通 UE24的方式 接入一个服务于它的基站 23 ,服务于 RN21的基站 23称为宿主基站（ Donor eNB, DeNB ), RN21和基站 23间的无线接口称为回传链路（ Backhaul Link ), 也称为 Un接口或 Un口。
根据 RN现有的架构， DeNB会为 RN代理实现 S-GW与分组数据网网 关（Packet Data Network Gateway, P-GW ) 的功能， 所述 S-GW和 P-GW 在基础架构中 ,都位于核心网。且 RN与 MME或其他相邻基站间的传输消 息， 都经过 DeNB的透传或处理完成转发。 也就是说， RN与 DeNB相连的 无线 Un口上不仅传输无线消息， 例如 RRC消息等， 还传输原基础网络架 构中属于有线传输的 Sl、 X2消息。 DeNB也同时具有与 RN所服务的 UE 相关的 Sl、 X2接口信息， 例如： S1应用层标识（ Sl-Application Identity, SI AP ID ), X2应用层标识（ X2-Application Identity, X2 AP ID )和 MME 标识等信息，以便 RN服务的 UE实现与其他网元间进行通信或其自身进行 小区切换。
当 RN出现问题， 或者出于某些实际需求， RN可能会中断与 DeNB间 的无线连接， 即 Un 口， 暂时或长期的退出网络。 与普通 UE 离开 RRC— CONNECTED, 即 Uu口断开的程序不同的是， Un口的中断会涉及与 RN 相连的 UE,也就是说 RN无法为这些 UE再提供与其他网元的通信等服务， 但 UE对此未知， 可能仍继续等待接收下行信令或请求上行信息发送的资 源， 直到检测或请求未果才能发现该无线链路失败。 这样会造成很多冗余 信令的传输， 也增大了 UE接入其他基站去获得服务的时延。 发明内容
有鉴于此，本发明实施例的主要目的在于提供一种回传链路（即 Un口） 中断时中继节点管理用户设备的方法和系统， 能够避免用户设备在中继节 点失效的情况下， 持续等待接收下行信令或请求上行信息发送的资源， 直 到检测或请求未果才能发现该无线链路失败。
为达到上述目的， 本发明实施例的技术方案是这样实现的：
本发明实施例提供了一种回传链路中断时中继节点 （RN )管理用户设 备（UE ) 的方法， 所述方法包括：
需要断开回传链路时， RN调度其服务的 UE切换到其他适合的小区， 或者通知 UE释放无线资源控制 （RRC )连接；
宿主基站（ DeNB )获知 RN服务的 UE已经离开 RN小区后， 断开与 RN间的回传链路。
其中， 所述 DeNB获知 RN服务的 UE已经离开 RN小区的方法包括： 所述 UE从源小区去附着后、或所述 UE成功切换到适合的小区后， RN 回复 RRC连接释放确认消息通知 DeNB, 所有 UE已经离开 RN小区； 或 者
预设的定时器到时后， DeNB获知 RN服务的 UE已经离开 RN小区。 其中， 所述定时器时长的设置， 包括：
适合切换过程中所有 UE从 RN小区去附着的平均时间； 或者
适合所有 UE切换完毕的平均时间； 或者
适合通知所有 UE释放 RRC连接的时间。
其中， 在 RN获知需要断开回传链路后， 并且在 RN回复 RRC连接释 放确认消息通知 DeNB或者定时器超时前， DeNB维持与 RN间的无线连接。 其中， 所述 RN获知需要断开回传链路的方法包括： RN收到 DeNB发 送的 RRC连接释放消息。
其中， 所述通知 UE释放 RRC连接， 包括： 分别对每个 UE发送专用 RRC连接释放消息； 或者向 RN小区中的所有 UE发送通知其释放 RRC连 接的广播消息。
其中， 所述调度其服务的 UE切换到其他适合的小区， 包括： 根据所述 UE测量上报结果， 调度 UE切换到其他适合的小区； 其中， 所述其他适合的小区， 包括： 为所述 RN服务的 DeNB所服务的小区、 或 为所述 RN服务的 DeNB下其他 RN所服务的小区、 或为所述 RN服务的
DeNB的相邻基站所服务的小区。
本发明实施例还提供了一种回传链路中断时中继节点管理用户设备的 系统， 所述系统包括： DeNB、 所述 DeNB下属的 RN和一个或多个 UE, 其中，
所述 RN, 用于需要断开回传链路时， 调度其服务的 UE切换到其他适 合的小区， 或者通知 UE释放 RRC连接；
所述 DeNB,用于获知 RN服务的 UE已经离开 RN小区后，断开与 RN 间的回传链路。
其中， 所述 DeNB获知 RN服务的 UE已经离开 RN小区的方法包括： 所述 UE从源小区去附着后、或所述 UE成功切换到适合的小区后， RN 回复 RRC连接释放确认消息通知 DeNB, 所有 UE已经离开 RN小区； 或 者
预设的定时器到时后， DeNB获知 RN服务的 UE已经离开 RN小区。 其中， 所述定时器时长的设置， 包括：
适合切换过程中所有 UE从 RN小区去附着的平均时间； 或者 适合所有 UE切换完毕的平均时间； 或者 适合通知所有 UE释放 RRC连接的时间。
其中， 所述 RN获知需要断开回传链路的方法包括： RN收到 DeNB发 送的 RRC连接释放消息。
其中， 所述通知 UE释放 RRC连接， 包括： 分别对每个 UE发送专用 RRC连接释放消息； 或者向 RN小区中的所有 UE发送通知其释放 RRC连 接的广播消息。
其中， 所述调度其服务的 UE切换到其他适合的小区， 包括： 根据所述 UE测量上报结果， 调度 UE切换到其他适合的小区； 其中， 所述其他适合的小区， 包括： 为所述 RN服务的 DeNB所服务的小区、 或 为所述 RN服务的 DeNB下其他 RN所服务的小区、 或为所述 RN服务的 DeNB的相邻基站所服务的小区。
本发明实施例所提供的回传链路中断时中继节点管理用户设备的方法 和系统， 在需要断开回传链路时， RN调度其服务的 UE切换到其他适合的 小区， 或者通知 UE释放 RRC连接； DeNB获知 RN服务的 UE已经离开 RN 小区后， 断开与 RN 间的回传链路。 在中继节点断开回传链路前通知 UE进行切换或者释放 RRC连接， 使得 UE能够快速接入合适的小区， 减 小冗余信令的发送， 保证良好的移动性能， 提升用户的使用感受。 附图说明
图 1为现有技术中 UE进行切换的流程示意图；
图 2是利用无线中继技术的网络结构示意图；
图 3为本发明实施例 Un口中断时中继节点管理用户设备的方法流程示 意图；
图 4为本发明 Un口中断时中继节点管理用户设备具体实施例一的流程 示意图；
图 5为本发明 Un口中断时中继节点管理用户设备具体实施例二的流程 示意图；
图 6为本发明 Un口中断时中继节点管理用户设备具体实施例三的流程 示意图；
图 7为本发明 Un口中断时中继节点管理用户设备具体实施例四的流程 示意图；
图 8为本发明实施例 Un口中断时中继节点管理用户设备的系统结构示 意图。 具体实施方式
本发明实施例的基本思想是： 需要断开回传链路时， RN调度其服务的 UE切换到其他适合的小区， 或者通知 UE释放 RRC连接； DeNB获知 RN 服务的 UE已经离开 RN小区后， 断开与 RN间的回传链路。
下面结合附图和具体实施例对本发明的技术方案进一步详细阐述。 图 3为本发明实施例 Un口中断时中继节点管理用户设备的方法流程示 意图， 如图 3所示， 所述方法包括以下步驟：
步驟 301 , 需要断开回传链路时， RN调度其服务的 UE切换到其他适 合的小区， 或者通知 UE释放 RRC连接；
具体的， 所述 RN获知需要断开回传链路的方法包括： RN收到 DeNB 发送的 RRC连接释放 ( RRC Connection Release ) 消息。
所述调度其服务的 UE切换到其他适合的小区， 包括： 根据所述 UE测 量上报结果， 调度 UE切换到合适的其他适合的小区。 其中， 所述其他适合 的小区， 包括： 为所述 RN服务的 DeNB所服务的小区、 或为所述 RN服务 的 DeNB下其他 RN所服务小区、或为所述 RN服务的 DeNB的相邻基站所 服务的小区。 所述 RN 向适合的小区的基站发送切换请求消息， 向其通知 UE所需的资源占用情况， 目标基站允许所述 UE接入， 则对 RN回复切换 请求确认消息， RN收到所述切换请求确认消息后， 向 UE发送 RRC连接 重配置（ RRC Connection Reconfiguration ) 消息， UE收到后从源小区去附 着。
所述通知 UE释放 RRC连接， 包括： 分别对每个 UE发送专用 RRC连 接释放消息；或者向 RN小区中的所有 UE发送广播消息，通知其释放 RRC 连接。
步驟 302, DeNB获知 RN服务的 UE已经离开 RN小区后， 断开与 RN 间的回传链路。
具体的， 所述断开与 RN间的回传链路， 具体为： RN像普通 UE—样 继续 RRC连接释放接下来的流程， 或者直接断电； DeNB在收到确认消息 或定时器超时后， 停止与所述 RN之间的上下行服务， 可能释放 RN及 UE 的上下文。 所述 DeNB获知 RN服务的 UE已经离开 RN小区的方法包括： 所述 UE从源小区去附着后、 或所述 UE成功切换到适合的小区后， RN回 复 RRC连接释放确认（ RRC Connection release Ack ) 消息通知 DeNB, 所 有 UE已经离开 RN小区； 或者预设的定时器到时后， DeNB获知 RN服务 的 UE已经离开 RN小区。
其中， 所述定时器时长的设置， 包括： 适合切换过程中所有 UE从 RN 小区去附着的平均时间； 或者适合所有 UE切换完毕、 即包括切换过程中失 败的 UE再进行小区重选等的平均时间； 或者适合通知所有 UE释放 RRC 连接的时间。 所述 UE从源小区去附着后， RN回复 RRC连接释放确认消 息通知 DeNB,所有 UE已经离开 RN小区，这种情况下所需的反馈时间短， 对 RN而言也比较简单，但因 RN向 DeNB回复确认消息后即中断了与 DeNB 间的无线连接，可能会造成数据包的丟失。所述 UE成功切换到适合的小区 后， RN回复 RRC连接释放确认消息通知 DeNB, 所有 UE已经离开 RN小 区，这种情况下对应图 1所示步驟 104中 RN收到最后一个切换程序结束的 UE上下文释放消息， 这种所有 UE的切换流程彻底结束的方案所需的时间 较长， 但 RN可将数据包转发给目标基站以避免数据包的丟失。 进一步需要说明的是， 在所述 DeNB获知 RN服务的 UE已经离开 RN 小区之前， 所述方法还包括： DeNB维持与 RN间的无线连接， 即保存与这 些 UE相关的 S1AP ID、 X2AP ID和 MME标识等信息 , 以保证 UE切换流 程的顺利进行。
只有当 RN已经开始像普通基站般为接入 RN小区的 UE进行服务后， RN与 DeNB间的 Un口中断才会对其下的 UE有所影响，否则 RN离开 RRC— CONNECTED的行为就如同普通 UE—样。 如果由于运营商的部署或其他 网络需求而使得需要中断 RN与 DeNB间的 RRC连接时， DeNB就会向 RN 发送 RRC连接释放消息。
需要说明的是， 在不沖突的情况下， 本申请中的实施例及实施例中的 特征可以相互组合。 下面将参考附图并结合实施例来详细说明本发明。 以 下实施例中，所述目标基站的小区为 RN对所属 UE进行切换所选择的适合 的小区。
图 4为本发明 Un口中断时中继节点管理用户设备具体实施例一的流程 示意图， 如图 4所示， 基于运营商的部署或网络的某些需求， 某个正在为 UE服务的 RN可能被暂时或长期的中断与 DeNB 间的无线连接。 此时， DeNB需要向 RN发送 RRC Connection Release消息， RN接收到该消息后 调度其服务的 UE切换到其他基站下合适的小区。 当 RN下所有的 UE都从 RN源小区去附着后， RN向 DeNB回复 RRC Connection Release Ack消息， 在此之前 DeNB需要维持与 RN间正常的无线连接。 具体流程为：
步驟 401，基于运营商的部署或网络的某些需求（如出于负载均衡目的 而需要为 RN更换 MME等），某个正在为 UE服务的 RN可能要中断与 DeNB 间的无线连接， 则 DeNB向 RN发送 RRC Connection Release消息；
步驟 402, RN收到 RRC Connection Release消息后， 根据其下 UE的 测量上报结果调度这些 UE切换到各自合适的其他基站下的小区； 具体的， RN向目标基站发送切换请求消息来对其通知 UE所需的资源 占用情况， 目标基站允许该 UE接入则对 RN回复切换请求确认消息， RN 根据这一消息内容对 UE发送 RRC Connection Reconfiguration消息， UE收 到后即可从源小区去附着。
步驟 403 ,待 RN服务的最后一个 UE从源小区去附着后， RN即向 DeNB 回复 RRC Connection Release Ack消息， 以向 DeNB通知该 RN下的所有 UE都已经离开 RN小区， RN像普通 UE—样继续 RRC连接释放接下来的 流程。
具体的， 在此之前 DeNB需要维持与 RN间正常的无线连接， 即也保 存与这些 UE相关的 S1AP ID、 X2AP ID和 MME标识等信息， 以保证 UE 切换程序的顺利进行。
需要注意的是， UE从源小区去附着后、 在接入目标小区的过程中可能 失败， 这样 UE会重新选择小区进行重建。 因 RN即将中断与 DeNB间的无 线连接且关闭 RN小区， 因此如果 UE重新选择的小区是 RN小区， 那么 RN 可能向 UE 回复发送 RRC 连接重建拒绝 （ RRC Connection Reestablishment Reject ) 消 息 , UE 收到 该 消 息 则 执行 离 开 RRC— CONNECTED的程序。
图 5为本发明 Un口中断时中继节点管理用户设备具体实施例二的流程 示意图， 如图 5所示， RN接收到 DeNB发送的 RRC Connection Release消 息后调度其下的 UE切换到其他基站下合适的小区。 当 RN服务的所有的 UE都切换完毕后， RN向 DeNB回复 RRC Connection Release Ack消息，在 此之前 DeNB需要维持与 RN间正常的无线连接。 具体流程为：
步驟 501 , 如果某个正在为 UE服务的 RN需要被中断与 DeNB间的无 线连接， 则 DeNB需向 RN发送 RRC Connection Release消息； 步驟 502, RN收到 RRC Connection Release消息后， 根据其下 UE的 测量上报结果调度这些 UE切换到各自合适的其他基站下的小区；
具体的， RN与目标基站间首先协调资源做切换准备， 待目标基站同意 接纳该 UE后即执行切换。在切换完成阶段， 目标基站通知位于核心网侧的 MME、 S-GW等网元间更新路径和用户面等信息。 整个切换过程结束， 目 标基站通知源基站释放该 UE的上下文。
步驟 503 , 待 RN服务的所有 UE都切换完毕后， RN即向 DeNB回复 RRC Connection Release Ack消息， 在此之前 DeNB需要维持与 RN间正常 的无线连接， 即也保存与这些 UE相关的 S1AP ID、 X2AP ID和 MME标识 等信息， 以保证 UE切换程序的顺利完成， RN像普通 UE—样继续 RRC连 接释放接下来的流程。
需要注意的是，在切换执行或完成阶段失败的 UE会重新选择小区进行 重建。 因 RN即将中断与 DeNB间的无线连接且关闭小区，如果 UE重新选 择的小区是 RN小区， 那么 RN可能发送 RRC Connection Reestablishment Reject消息给 UE, UE收到该消息则执行离开 RRC— CONNECTED的程序； 如果 UE重选到其他小区， RN自身的相关定时器会超时。因此， RN向 DeNB 回复 RRC Connection Release Ack消息的确切时刻应该是其服务的所有 UE 都完成了切换成功， 即收到释放 UE上下文的消息； 或失败， 即回复了 RRC Connection Reestablishment Rej ect消息或定时器超时， 程序后的时刻。
图 6为本发明 Un口中断时中继节点管理用户设备具体实施例三的流程 示意图， 如图 6所示， RN接收到 DeNB发送的 RRC Connection Release消 息后可调度其服务的 UE切换到其他基站下合适的小区或直接释放与这些 UE的 RRC连接。 DeNB可预先设置定时器，该定时器在 DeNB向 RN发送 RRC Connection Release消息时开启， 在预置时间到达后超时， 当定时器超 时时， DeNB认为 RN已经将其服务的 UE切换或释放， 如果执行的是切换 程序， 则在此之前 DeNB需要维持与 RN间正常的无线连接。 具体流程为： 步驟 601 , 如果某个正在为 UE服务的 RN需要被中断与 DeNB间的无 线连接， 则 DeNB需向 RN发送 RRC Connection Release消息， DeNB预置 一个定时器， 当 DeNB发送该消息时， 定时器开始计时；
步驟 602, RN收到 RRC Connection Release消息后， 将其服务的 UE 切换到各自合适的其他基站下的小区或释放与 UE间的 RRC连接；
步驟 603 , DeNB的定时器到时后， 认为 RN完成了切换或释放其服务 的 UE, 然后像普通 UE—样继续 RRC连接释放接下来的流程。
具体的， DeNB内定时器的时长可以有三种选择，一是适合切换过程中 所有 UE仅从源 RN小区去附着的平均时间； 二是适合所有 UE切换完毕的 平均时间； 三是适合通知所有 UE释放 RRC连接的时间。 如果选择 RN在 收到 RRC Connection Release消息后将其服务的 UE切换至其他基站下合适 的小区， 那么在定时器超时前， DeNB需要维持与 RN间正常的无线连接， 即也保存与这些 UE相关的 S1AP ID、 X2AP ID和 MME标识等信息 , 以保 证 UE切换程序的顺利进行。
需要注意的是， 当定时器超时可能有个别 UE还未完成切换的相关流 程， 但因 Un口的 Sl、 X2连接已释放， UE不可再执行切换， RN可以释放 这些 UE或者不再为其提供基站类的服务， 即 RN仅有 UE身份， 而使得 UE自身获知无线链路失败回到 RRC— IDLE状态。
图 7为本发明 Un口中断时中继节点管理用户设备具体实施例四的流程 示意图， 如图 7所示， RN接收到 DeNB发送的 RRC Connection Release消 息后可直接通知其服务的 UE释放 RRC连接，这个向 UE通知释放 RRC连 接的消息可以是专用或公用的消息。 在 DeNB侧， 可以是 RN在释放后向 DeNB回复 RRC Connection Release Ack消息， 或者是在 DeNB中预置一个 时长适合 UE接收到该通知消息的定时器（例如具体实施例三所述的流程 \ 具体流程为：
步驟 701 , 如果某个正在为 UE服务的 RN需要被中断与 DeNB间的无 线连接， 则 DeNB需向 RN发送 RRC Connection Release消息；
步驟 702, RN收到 RRC Connection Release消息后直接释放与其服务 的所有 UE间的 RRC连接；
具体的， 例如部署在小区边缘的 RN, 即使 RN勉强为 UE选择到目标 小区， 即前述适合的小区， 该切换的成功几率也不高， 或在切换后又会重 新选择小区。
所述释放消息的发送有两种选择，一是分别对每个 UE发送现有的专用 RRC Connection Release消息； 二是新增一种公用的系统消息， 该系统消息 对 RN小区中的所有 UE广播， UE接收到该系统消息即知服务基站要释放 与自身间的 RRC无线连接， 则其在与系统消息相关的下一个变更周期开始 即离开 RRC— CONNECTED。
步驟 703 , RN完成了释放其服务的 UE,然后像普通 UE—样继续 RRC 连接释放接下来的流程。
进一步的， 若采取的是如实施例三所述的定时器方案， 则 DeNB可根 据 RN广播的系统消息的变更周期来设置定时器的时长，当广播的该系统消 息的下一个变更周期到达时，该定时器也计时完毕；或是一个适合 RN向所 有 UE都发送专用的 RRC Connection Release消息的时间。 若采用的是回复 确认消息的方案 ,则 RN可在广播系统消息后的下一个变更周期起始时刻或 已向所有 UE都发送专用的 RRC Connection Release消息后，对 DeNB回复 RRC Connection Release Ack消息。 RN通知其服务的 UE都释放后即像普通 UE一样继续 RRC连接释放接下来的流程。
显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步驟 可以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者 分布在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执 行的程序代码来实现， 从而， 可以将它们存储在存储装置中由计算装置来 执行， 或者将它们分别制作成各个集成电路模块， 或者将它们中的多个模 块或步驟制作成单个集成电路模块来实现。 这样， 本发明不限制于任何特 定的硬件和软件结合。
图 8为本发明实施例 Un口中断时中继节点管理用户设备的系统结构示 意图， 如图 8所示， 所述系统包括： DeNB81、 所述 DeNB81下属的 RN82 和一个或多个 UE83 , 其中，
所述 RN82, 用于需要断开回传链路时， 调度其服务的 UE83切换到其 他适合的小区， 或者通知 UE83释放 RRC连接；
具体的， 所述 RN82 获知需要断开回传链路的方法包括： RN82 收到 DeNB81发送的 RRC连接释放消息。
所述调度其服务的 UE83切换到其他适合的小区，包括:根据所述 UE83 测量上报结果， 调度 UE83切换到合适的其他适合的小区。 其中， 所述其他 适合的小区， 包括： 为所述 RN82服务的 DeNB81所服务的小区、 或为所 述 RN82服务的 DeNB81下其他 RN82所服务的小区、或为所述 RN82服务 的 DeNB81 的相邻基站所服务的小区。 所述 RN82向适合的小区的基站发 送切换请求消息， 向其通知 UE83所需的资源占用情况， 目标基站允许所述 UE83接入， 则对 RN82回复切换请求确认消息， RN82收到所述切换请求 确认消息后， 向 UE83 发送 RRC 连接重配置 （ RRC Connection Reconfiguration ) 消息， UE83收到后从源小区去附着。
所述通知 UE83释放 RRC连接，包括：分别对每个 UE83发送专用 RRC 连接释放消息； 或者向 RN82小区中的所有 UE83发送广播消息， 通知其释 放 RRC连接。
所述 DeNB81 , 用于获知 RN82服务的 UE83已经离开 RN82负责的小 区后， 断开与 RN82间的回传链路。
具体的， 所述断开与 RN82间的回传链路， 具体为： RN82像普通 UE 一样继续 RRC连接释放接下来的流程， 或者或直接断电； DeNB81在收到 确认消息或定时器超时后，停止与所述 RN82之间的上下行服务，或者释放 RN82及 UE的上下文。所述 DeNB81获知 RN82服务的 UE83已经离开 RN82 负责的小区的方法包括： 所述 UE83从源小区去附着后、 或所述 UE83成功 切换到适合的小区后， RN82 回复 RRC 连接释放确认 ( RRC Connection release Ack ) 消息通知 DeNB81 , 所有 UE83已经离开 RN82负责的小区； 或者预设的定时器到时后， DeNB81获知 RN82服务的 UE83已经离开 RN82 负责的小区。
其中， 所述定时器时长的设置， 包括： 适合切换过程中所有 UE83从源 RN82小区去附着的平均时间； 或者适合所有 UE83切换完毕， 即包括切换 过程中失败的 UE83 再进行小区重选等， 的平均时间； 或者适合通知所有 UE83释放 RRC连接的时间。 所述 UE83从源小区去附着后， RN82回复 RRC连接释放确认消息通知 DeNB81 ,所有 UE83已经离开 RN82负责的小 区， 这种情况下所需的反馈时间短， 对 RN82而言也比较简单， 但因 RN82 向 DeNB81回复确认消息后即中断了与 DeNB81 间的无线连接， 可能会造 成数据包的丟失。 所述 UE83成功切换到适合的小区后， RN82回复 RRC 连接释放确认消息通知 DeNB81 , 所有 UE83已经离开 RN82负责的小区， 这种情况下 RN82收到最后一个切换程序结束的 UE83上下文释放消息，这 种所有 UE83的切换流程彻底结束的方案所需的时间较长，但 RN可将数据 包转发给目标基站以避免数据包的丟失。
进一步需要说明的是，在所述 DeNB81获知 RN82服务的 UE83已经离 开 RN82负责的小区之前， 所述方法还包括： DeNB81维持与 RN82间的无 线连接， 即保存与这些 UE83相关的 S1AP ID、 X2AP ID和 MME标识等信 息， 以保证 UE83切换流程的顺利进行。
只有当 RN82已经开始像普通基站般为接入 RN82小区的 UE83进行服 务后， RN82与 DeNB81间的 Un口中断才会对其下的 UE83有所影响， 否 贝' J RN82离开 RRC— CONNECTED的行为就如同普通 UE—样。 如果由于 运营商的部署或其他网络需求而使得需要中断 RN82与 DeNB81间的 RRC 连接时， DeNB81就会向 RN82发送 RRC连接释放消息。
需要说明的是， 在不沖突的情况下， 本申请中的实施例及实施例中的 特征可以相互组合。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种回传链路中断时中继节点（RN )管理用户设备（UE )的方法， 其特征在于， 所述方法包括：
需要断开回传链路时， RN调度其服务的 UE切换到其他适合的小区， 或者通知 UE释放无线资源控制 （RRC )连接；
宿主基站（ DeNB )获知 RN服务的 UE已经离开 RN小区后， 断开与 RN间的回传链路。
2、 根据权利要求 1所述的方法， 其特征在于， 所述 DeNB获知 RN服 务的 UE已经离开 RN小区的方法包括：
所述 UE从源小区去附着后、或所述 UE成功切换到适合的小区后， RN 回复 RRC连接释放确认消息通知 DeNB, 所有 UE已经离开 RN小区； 或 者
预设的定时器到时后， DeNB获知 RN服务的 UE已经离开 RN小区。
3、根据权利要求 2所述的方法，其特征在于， 所述定时器时长的设置， 包括：
适合切换过程中所有 UE从 RN小区去附着的平均时间； 或者
适合所有 UE切换完毕的平均时间； 或者
适合通知所有 UE释放 RRC连接的时间。
4、 根据权利要求 2所述的方法， 其特征在于， 在 RN获知需要断开回 传链路后， 并且在 RN回复 RRC连接释放确认消息通知 DeNB或者定时器 超时前， DeNB维持与 RN间的无线连接。
5、 根据权利要求 1或 2所述的方法， 其特征在于， 所述 RN获知需要 断开回传链路的方法包括： RN收到 DeNB发送的 RRC连接释放消息。
6、 根据权利要求 1或 2所述的方法， 其特征在于， 所述通知 UE释放 RRC连接， 包括： 分别对每个 UE发送专用 RRC连接释放消息； 或者向 RN小区中的所有 UE发送通知其释放 RRC连接的广播消息。
7、 根据权利要求 1或 2所述的方法， 其特征在于， 所述调度其服务的 UE切换到其他适合的小区， 包括：
根据所述 UE测量上报结果， 调度 UE切换到其他适合的小区； 其中， 所述其他适合的小区， 包括： 为所述 RN服务的 DeNB所服务的小区、 或 为所述 RN服务的 DeNB下其他 RN所服务的小区、 或为所述 RN服务的 DeNB的相邻基站所服务的小区。
8、 一种回传链路中断时中继节点管理用户设备的系统， 其特征在于， 所述系统包括： DeNB, 所述 DeNB下属的 RN和一个或多个 UE, 其中， 所述 RN, 用于需要断开回传链路时， 调度其服务的 UE切换到其他适 合的小区， 或者通知 UE释放 RRC连接；
所述 DeNB,用于获知 RN服务的 UE已经离开 RN小区后，断开与 RN 间的回传链路。
9、 根据权利要求 8所述的系统， 其特征在于， 所述 DeNB获知 RN服 务的 UE已经离开 RN小区的方法包括：
所述 UE从源小区去附着后、或所述 UE成功切换到适合的小区后， RN 回复 RRC连接释放确认消息通知 DeNB, 所有 UE已经离开 RN小区； 或 者
预设的定时器到时后， DeNB获知 RN服务的 UE已经离开 RN小区。
10、 根据权利要求 9所述的系统， 其特征在于， 所述定时器时长的设 置， 包括：
适合切换过程中所有 UE从 RN小区去附着的平均时间； 或者 适合所有 UE切换完毕的平均时间； 或者
适合通知所有 UE释放 RRC连接的时间。
11、根据权利要求 8或 9所述的系统， 其特征在于， 所述 RN获知需要 断开回传链路的方法包括： RN收到 DeNB发送的 RRC连接释放消息。
12、根据权利要求 8或 9所述的系统， 其特征在于， 所述通知 UE释放 RRC连接， 包括： 分别对每个 UE发送专用 RRC连接释放消息； 或者向 RN小区中的所有 UE发送通知其释放 RRC连接的广播消息。
13、 根据权利要求 8或 9所述的系统， 其特征在于， 所述调度其服务 的 UE切换到其他适合的小区， 包括：
根据所述 UE测量上报结果， 调度 UE切换到其他适合的小区； 其中， 所述其他适合的小区， 包括： 为所述 RN服务的 DeNB所服务的小区、 或 为所述 RN服务的 DeNB下其他 RN所服务的小区、 或为所述 RN服务的 DeNB的相邻基站所服务的小区。
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