WO2011006445A1 - 一种中继切换方法、系统和设备 - Google Patents

一种中继切换方法、系统和设备 Download PDF

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Publication number
WO2011006445A1
WO2011006445A1 PCT/CN2010/075211 CN2010075211W WO2011006445A1 WO 2011006445 A1 WO2011006445 A1 WO 2011006445A1 CN 2010075211 W CN2010075211 W CN 2010075211W WO 2011006445 A1 WO2011006445 A1 WO 2011006445A1
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cell
path switching
core network
request message
enb
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PCT/CN2010/075211
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English (en)
French (fr)
Inventor
汪颖
鲍炜
刘佳敏
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大唐移动通信设备有限公司
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Publication of WO2011006445A1 publication Critical patent/WO2011006445A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0064Transmission or use of information for re-establishing the radio link of control information between different access points
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link

Definitions

  • the invention relates to a Chinese patent application filed on July 16, 2009, the Chinese Patent Application No. 200910089339.2, entitled “A Relay Switching Method, System and Device” Priority is hereby incorporated by reference in its entirety.
  • the present invention relates to the field of communications technologies, and in particular, to a relay switching method, system, and device. Background technique
  • LTE Long Term Evolution
  • 3G 3rd Generation, 3rd Generation Mobile Communication System
  • LTE improves and enhances 3G air access technology, using OFDM (Orthogonal Frequency Division Multiplexing).
  • MIMO Multiple Input Multiple Output
  • LTE can provide downlink peak rates of 100 Mbit/s and uplink 50 Mbit/s in a 20 MHz spectrum bandwidth, improving the performance of cell edge users, increasing cell capacity, and reducing system delay.
  • the technical characteristics of LTE include high data rate, packet transmission, low delay, wide area coverage and backward compatibility. As the number of mobile terminal users grows rapidly, the service capacity of end users grows exponentially.
  • the B3G system (illustrated by the B3G system as an example) needs only part or all of the bandwidth in the higher frequency band, for example, in the frequency band above 3 GHz, but in practice
  • the higher the frequency band the faster the propagation of the radio wave is, and the shorter the transmission distance is; that is, in the same coverage area, more continuous base stations are required to ensure continuous coverage.
  • the base station has a high cost, when a lot of base stations are needed, it will increase. Add the cost of creating a network.
  • various vendors and standardization organizations introduce relays into the cellular system, thereby increasing the coverage area.
  • the inventors have found that the following problems exist in the prior art: During the mobile process, the user terminal will be between the relay and the relay, or relayed with the DeNB (Donor evolved Node B, service) The handover process occurs between the enhanced Node Bs, and the existing 3GPP specifications do not define the Intra-DeNB (intra-DeNB internal) handover procedure of the LTE-A system, that is, between the DeNB and the DeNB, and the DeNB. The switching mechanism between the lower relay and other relays under the DeNB. Summary of the invention
  • the embodiments of the present invention provide a relay handover method, system, and device, so as to implement a relay handover process of a user terminal in a mobile process, and save signaling overhead of the network.
  • an embodiment of the present invention provides a relay switching method, including the following steps:
  • the source node When the cell handover occurs, the source node sends a handover request message to the target node, where the switch request message carries the information of the source cell and the information of the target cell.
  • the target node reserves a corresponding resource for the target cell
  • the embodiment of the invention provides a relay switching system, which includes:
  • a source node configured to send, by the UE, a handover request message to the target node, where the handover request message carries the information of the source cell and the information of the target cell; a target node, configured to reserve a corresponding resource for the target cell when the target cell is a cell managed by the target node; when the target node is an RN and needs to initiate a path switching process to the core network,
  • the core network sends a path switching request message, where the path switching request message carries a globally unique identifier of the core network; or the target node does not initiate a path switching process to the core network.
  • the embodiment of the invention provides a relay switching device, which includes:
  • a receiving module configured to receive a handover request message from a source node, where the handover request message carries the information of the source cell and the information of the target cell, and the determining module is configured to receive according to the receiving module
  • the information of the target cell determines whether the target cell is a cell managed by the target node
  • a processing module configured to reserve a corresponding resource for the target cell when the determining module determines that the target cell is a cell managed by the target node;
  • the target node When the target node is an RN and needs to initiate a path switching process to the core network, send a path switching request message to the core network, where the path switching request message carries a globally unique identifier of the core network; or the target The node does not initiate a path switching process to the core network.
  • the present invention has the following advantages: When an internal eNB cell handover occurs in a UE, the source node initiates an X2 handover request procedure to the target node, and the handover process is completed in the EUTRAN, and the resource requested by the source cell can be targeted. All the cells are accepted, and the core network does not need to be notified after the handover is completed, which reduces the signaling load on the core network.
  • FIG. 1 is a flowchart of a method for relaying handover according to Embodiment 1 of the present invention
  • 2 is a network architecture after the RN is introduced in the LTE-A system according to the first embodiment of the present invention
  • Embodiment 3 is a protocol stack structure including an RN according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic diagram of a networking situation during a relay handover according to Embodiment 1 of the present invention
  • FIG. 5 is a flowchart of a relay handover method according to Embodiment 2 of the present invention.
  • FIG. 6 is a flowchart of a relay switching method according to Embodiment 3 of the present invention.
  • FIG. 7 is a flowchart of a method for relaying handover according to Embodiment 4 of the present invention.
  • FIG. 8 is a structural diagram of a relay switching device according to Embodiment 5 of the present invention. detailed description
  • the RN in the LTE-A is equivalent to a cell under one DeNB.
  • the X2 handover procedure is initiated between the source node and the target node, and the handover process is performed.
  • the EUTRAN is completed, and the core network does not need to be notified in a specific scenario, thereby reducing the signaling load on the core network.
  • the target node determines that the target cell is the cell managed by the target node, the corresponding resource needs to be reserved for the target cell.
  • the determining process of notifying the core network in a specific scenario is specifically determining whether the source cell information and the target cell information are cell handovers under the same eNB; when the determination result is yes, further determining whether the resource requested by the source cell can be It is accepted by itself; when the judgment result is yes, it is determined that it is not necessary to initiate a path switching process to the core network, thereby reducing the signaling load on the core network.
  • the RN does not perform the above-mentioned determination of whether the path switching needs to be initiated, and directly initiates the path switching process.
  • the DeNB of the RN determines whether the process needs to be terminated. If you need to terminate this The process, the Path Switch Request ACK is generated by the DeNB; otherwise, the DeNB needs to forward the message related to the Path Switch process between the RN and the core network.
  • the DeNB's judgment method is as follows:
  • the intra-DeNB handover and the resources requested by the source cell can all be accepted by the target RN, and the DeNB terminates the process;
  • a relay switching method includes the following steps:
  • Step 101 When the cell handover occurs, the source node sends a handover request message to the target node, where the handover request message carries the information of the source cell and the information of the target cell.
  • Step 102 The target node determines, according to the information of the target cell, whether the target cell is a cell managed by itself.
  • Step 103 When the target cell is a cell managed by the target node, the target node reserves a corresponding resource for the target cell.
  • the target node When the target node is an RN and needs to initiate a path switching process to the core network, send a path switching request message to the core network, where the path switching request message carries a globally unique identifier of the core network; or the target The node does not initiate a path switching process to the core network. Further, before the sending the path switching request message to the core network, the method further includes: determining, by the target node, whether a path switching process needs to be initiated to the core network according to the handover request message and the resource requested by the source cell.
  • Determining whether the target node needs to initiate a path switching process to the core network according to the handover request message and the resource requested by the source cell specifically includes: determining, by the target node, whether the cell is the same eNB according to the source cell information and the target cell information. Switching; when it is a cell handover under the same eNB, the target node determines whether the resource requested by the source cell can be The target node determines that it is not necessary to initiate a path switching process to the core network; when it cannot be fully accepted by itself, the target node determines that a path switching process needs to be initiated to the core network.
  • the cell handover of the UE is specifically that the UE performs cell handover within the eNB.
  • the method further includes: the eNB is directed to the core.
  • the network sends a path switching request message, and receives a path switching confirmation message from the core network to update resources required by the source cell.
  • the sending a path switching request message to the core network specifically includes: the RN sending a path switching request message to the eNB;
  • the eNB forwards the path switching request message to the core network according to the globally unique identifier of the core network; after the sending the path switching request message to the core network, the method further includes: the eNB receiving a path switching acknowledgement message from the core network And forwarding the path switching acknowledgement message to the RN to update resources required by the source cell.
  • the sending the path switching request message to the core network includes: sending, by the second RN, a path switching request message to the eNB; the eNB forwarding the path switching request message to the core network according to the global unique identifier of the core network; After the path switching request message is sent to the core network, the method further includes: the eNB receiving a path switching confirmation message from the core network, and forwarding the path switching confirmation message to the second RN, to update the source The resources required by the community.
  • the source node when the UE performs internal eNB cell handover, the source node initiates an X2 handover request procedure to the target node, and the handover process is completed in the EUTRAN, and the resources requested by the source cell can be completely accepted by the target cell. After the handover is completed, the core network does not need to be notified, and the signaling load on the core network is reduced.
  • the target RN does not need to initiate the path.
  • the decision of switching is initiated, and the path switching process is initiated directly.
  • the DeNB of the RN determines whether the process needs to be terminated. If the process needs to be terminated, the Path Switch Request ACK (Path Switch Request ACK) is generated by the DeNB; otherwise, the DeNB needs to forward the Path Switch process related message between the RN and the core network.
  • the DeNB's judgment method is as follows:
  • the intra-DeNB handover and the resources requested by the source cell can all be accepted by the target RN, and the DeNB terminates the process;
  • a relay switching method is provided in the second embodiment of the present invention.
  • the method is applicable to a network architecture after the introduction of an RN (Relay Node), and is introduced in the LTE-A system as shown in FIG. a network architecture after the RN, where the RN accesses the core network through a donor cell (cell) under the eNB; it should be noted that the RN acts as a relay node under one eNB and can be regarded as the eNB under the eNB.
  • the eNB is a DeNB
  • the interface between the DeNB and the RN is a wireless Un interface, where there is no direct wired interface between the RN and the core network, and each RN can control one or more
  • each eNB can control and manage one or more RNs.
  • an X2 interface between the RN and the DeNB needs to be established, and the established X2 interface is created based on the protocol stack architecture including the RN as shown in FIG. 3, and the protocol stack architecture is RN, RN, and DeNB. And a control plane protocol stack between the RN and other eNBs.
  • the core network and the eNB are connected through the S1 interface, and the eNBs are connected through the X2 interface, between the RN and the eNB. It is connected through the Un interface, and the UE and the RN are connected through the Uu interface; wherein, when the UE (user terminal) moves (for example, moves from left to right), there are seven different handover situations.
  • the user terminal is handed over by the base station eNB1 to another base station eNB2.
  • both the source node and the target node are base stations; (2) the user terminal is handed over by the base station eNB1 to the relay RN1 or RN2 to which the eNB 1 belongs, at this time, The source node is the base station, the target node (3) The user terminal is handed over to the base station eNB1 by the relay RN1 or RN2 to which the base station eNB1 belongs. At this time, the source node is the relay and the target node is the base station; (4) the user terminal is switched to the subordinate by the relay RN1.
  • the relay node RN2 of the same base station at this time, both the source node and the target node are relayed; (5) the user terminal is handed over by the base station eNB1 to the relay RN3 or RN4 to which the other base station eNB2 belongs, and at this time, the source node is the base station.
  • the target node is a relay; (6) the user terminal is handed over to the other base station eNB2 by the relay RN1 or RN2 to which the base station eNB1 belongs, at this time, the source node is a relay, and the target node is a base station; (7) the user terminal is a base station The relay RN1 or RN2 to which the eNB1 belongs switches to the relay RN3 or RN4 to which the other base station eNB2 belongs. At this time, both the source node and the target node are relayed.
  • the LTE-A system Intra-DeNB handover procedure is separately described in the embodiment of the present invention, and the Intra-DeNB handover procedure corresponds to the foregoing
  • There are two cases for example, eNB1 switches to RN1 or RN2
  • a third case for example, RN1 switches to eNB1
  • a fourth case for example, RN1 switches to RN2.
  • the embodiment of the present invention will describe in detail the processing procedure when the user terminal switches from the RN to the eNB.
  • the foregoing relay switching method includes the following steps:
  • Step 501 The source RN performs a HO decision (HandOver decision).
  • the embodiment of the present invention is described by taking an RN to an eNB as an example.
  • the source RN is exemplified by the RN1
  • the eNB is an eNB1, because the embodiment of the present invention is LTE-A.
  • the eNB1 is the serving DeNBL of the RN1.
  • the RN1 decides to handover the UE from the RN1 to the DeNB1 according to the obtained UE measurement report.
  • the measurement report of the UE is specified in the existing protocol.
  • the communication system requires the UE to switch between adjacent cells due to the mobility of the UE or other reasons, in order to be able to To achieve the handover between the neighboring cells, the UE must measure the signal quality of the cell of the candidate handover target before the handover, and the UE needs to report the result of the measurement standard to the network side device in the manner of a MEASURENET REPORT. The system makes a decision to switch, and will not repeat them here.
  • Step 502 The RN1 sends a HO request (Handover Request) message to the DeNB1.
  • a HO request Handover Request
  • the RN1 learns that it needs to switch to the DeNB1, the RN1 needs to send the HO request to the DeNB1. Message.
  • Step 503 The DeNB1 parses the target cell ID in the HO request message, and returns a HO request ACK (Handover Request Acknowledgement) information to the RN1.
  • HO request ACK Handover Request Acknowledgement
  • the HO request message carries the information of the target cell ID, and the DeNB1 obtains the information of the target cell ID, so as to know whether the target cell is a cell managed by itself, and when the target cell is a cell managed by itself, The target cell performs corresponding resource reservation; when the target cell is not the cell managed by the DeNB1, this case will not be described in detail.
  • the DeNB1 when the target cell is a cell managed by the DeNB1, the DeNB1 needs to reserve a corresponding resource for the target cell. For example, when the target cell needs 10M resources, the DeNB1 needs to reserve not less than 10M for the target cell.
  • the resources are such that the UE under the target cell can correctly transmit data.
  • the HO request ACK information is used to confirm to the RN1 that the HO request message from the RN1 has been received.
  • Step 504 The RN1 sends an RRC (Radio Resource Control) Connection Reconfiguration message to the UE.
  • the RRC is used to process Layer 3 information of the control plane between the UE and the network side device, including RRC connection establishment, RRC reconfiguration, RRC maintenance, and RRC release.
  • the RN1 needs to establish an RRC connection with the RN1, and the UE needs to handover to the DeNB1 in the embodiment of the present invention, that is, the UE needs to re-establish an RRC connection with the DeNB1.
  • the RN1 sends an RRC Connection Reconfiguration message to the UE. Therefore, the UE is triggered to establish an RRC connection with the DeNB1.
  • Step 505 The UE sends an RRC Connection Reconfiguration Complete message to the DeNB1, that is, the UE accesses the DeNB1 to establish an RRC connection with the DeNB1.
  • Step 506 The DeNB1 determines whether it is necessary to send a Path Switch request message to the MME (Mobile Management Entity).
  • the MME is a network element in the core network.
  • the DeNB1 needs to be small according to the source carried in the HO request message.
  • the area ID and the target cell ID determine whether the cell handover is performed under the same DeNB, that is, when the source cell ID and the target cell ID belong to the same DeNB, the cell handover is performed under the same DeNB; when the source cell ID and the target cell ID are not When the same DeNB belongs to the cell handover under different DeNBs, this situation will not be described in detail.
  • the target cell belongs to
  • the DeNB 1 may obtain the DeNB to which the source cell belongs according to the source cell ID in the RRC context carried in the HO request message, and determine whether the DeNB to which the target cell belongs and the DeNB to which the source cell belongs are the same.
  • the DeNB1 determines whether the Path Switch Request message needs to be sent to the MME, and the determining process specifically includes:
  • the DeNB1 determines whether the resource requested by the source cell can be completely accepted by the DeNB1. When the resource requested by the source cell can be completely accepted by the DeNB1, the DeNB1 does not need to send a PathSwitch Request message to the MME, that is, the path update process does not need to be initiated to the core network.
  • the DeNB1 needs to send a Path Switch Request message to the MME, that is, a path update process needs to be initiated to the core network.
  • the resource requested by the source cell (the UE transmits data through the source cell) is the resource 1, the resource 2, and the resource 3. (that is, the MME transmits the data of the resource 1, the data of the resource 2, and the data of the resource 3 to the source cell through the DeNB1 in real time), but in actual applications, if the DeNB1 only transmits the data of the resource 1 and the resource 2 to the source cell.
  • the DeNB1 sends a Path Switch Request message to the MME, so that the MME transmits the data of the resource 1 and the data of the resource 2 to the source cell through the DeNB1, thereby saving resources of the system.
  • the DeNB1 when the DeNB1 sends the data of the resource 1, the data of the resource 2, and the data of the resource 3 to the source cell, it indicates that the resource requested by the source cell can be completely accepted by the DeNB1, and does not need to be sent to the MME at this time.
  • Path Switch Request message which will not be described here.
  • the step further includes:
  • Step 506a the DeNB1 sends a Path Switch Request message to the MME.
  • Step 506b The MME returns a Path Switch Request Ack message to the DeNB1 to update the resources required by the source cell.
  • the update process has been described in detail in the above step 506. For example, after the update, the MME only needs to send the data of the resource 1 and the data of the resource 2 to the source cell (the MME needs to send the resource 1 to the source cell before the update). Data, resource 2 data and resource 3 data), thereby saving system resources.
  • Step 507 When the UE accesses the DeNB1, the DeNB1 sends a UE context release message to the RN1, thereby triggering the RN1 to release the RRC connection with the UE.
  • the method of the present invention can adjust the sequence of each step according to actual needs.
  • the process of the process between the foregoing steps 501 and 507 that is, the relay handover process in which the user terminal is handed over to the base station eNB by the relay RN to which the base station eNB belongs, and the relay switching process described above may be implemented.
  • the process is performed by the UE in the Intra-eNB, and the handover process is performed in an EUTRAN (Evolved Universal Terrestrial Radio Access Network).
  • EUTRAN Evolved Universal Terrestrial Radio Access Network
  • a relay switching method is provided in the third embodiment of the present invention.
  • the method is directed to the second case, that is, the embodiment of the present invention will describe in detail the processing when the user terminal switches from the eNB to the RN.
  • Process, as shown in FIG. 6, the foregoing relay switching method includes the following steps:
  • Step 601 The eNB performs a handover decision.
  • the embodiment of the present invention is described by taking an eNB as an example of switching to an RN.
  • the eNB is an eNB1 as an example.
  • the RN is described by using RN1 as an example.
  • the eNB1 is the serving DeNB1 of the RN1.
  • the DeNB1 decides to switch the UE from the DeNB1 to the RN1 according to the obtained UE measurement report.
  • Step 602 The DeNB1 sends a HO request message to the RN1.
  • Step 603 The RN1 parses the target cell ID in the HO request message, and returns HO request ACK information to the DeNB1.
  • the HO request message carries the information of the target cell ID, and the RN1 obtains the information of the target cell ID, so as to know whether the target cell is a cell managed by itself, and when the target cell is a cell managed by itself, The target cell performs corresponding resource reservation; when the target cell is not the cell managed by the RN1, this situation will not be described in detail. It should be noted that, when the target cell is a cell managed by the RN1, the RN1 needs to reserve a corresponding resource for the target cell.
  • Step 604 The DeNB1 sends an RRC Connection Reconfiguration message to the UE, so that the UE is triggered to establish an RRC connection with the RN1.
  • Step 605 The UE sends an RRC Connection Reconfiguration Complete message to the RN1, that is, the UE accesses the RN1, and establishes an RRC connection with the RN1.
  • Step 606 The RN1 determines whether a Path Switch Request message needs to be sent to the MME.
  • the RN1 determines whether the cell handover is performed by the same DeNB according to the source cell ID and the target cell ID carried in the HO request message. When the cell handover is performed by the same DeNB, the RN1 determines whether it needs to send the Path to the MME.
  • the Switch Request message the determining process specifically includes: RN1 determines whether the resource requested by the DeNB1 (or the source cell) can be completely accepted by the RN1; when the resource requested by the DeNB1 can be fully accepted by the RN1, the RN1 does not need to send the Path Switch Request to the MME.
  • the message, that is, the path update process is not required to be sent to the core network; otherwise, the RN1 needs to send a Path Switch Request message to the MME through the DeNB1, that is, the path update process needs to be initiated to the core network.
  • the step further includes:
  • Step 606a the RN1 sends a Path Switch Request message to the DeNB1, where the PathSwitch Request message needs to carry the information of the Globally Unique MME Identifier (GUMMEI), so that the DeNB1 can locate the MME by using the GUMMEI information. That is, the GUMMEI information carries the address information of the MME.
  • GUMMEI Globally Unique MME Identifier
  • the method for carrying the address information of the MME in the Path Switch Request message is also applicable to the handover process between the eNBs, and is switched from other nodes (for example, other eNBs or RNs under other eNBs) to the RN cells under the DeNB. Switch the scenario, and I won't go into details here.
  • the path switch request message with the GUMMEI information added is as shown in Table 1:
  • the path identifier of the MME may be carried in the Path Switch Request message, and the DeNB1 performs the addressing operation of the MME according to the global unique identifier. No longer.
  • step 606b the DeNB1 sends a Path Switch Request message to the MME, and the DeNB1 obtains the address of the MME according to the GUMMEI information in the Path Switch Request message from the RN1, and sends a Path Switch Request message to the MME according to the address.
  • step 606c the MME returns a Path Switch Request Ack message to the DeNB1.
  • step 606d the DeNB1 returns a Path Switch Request Ack message to the RN1.
  • the above step 606 is an optional step.
  • the RN1 directly performs the above-mentioned 606a without making a judgment.
  • the DeNB1 After the DeNB1 receives the Path Switch Request message sent by the RN1, the DeNB1 performs the following determination process:
  • the determining process specifically includes:
  • the DeNB1 determines whether it is the inter-cell handover under the same DeNB according to the Path Switch Request message, and does not forward the Path Switch Request message if it is the inter-cell handover under the same DeNB 1; otherwise, forwards; (in this embodiment, RN1 And the cell under the jurisdiction of DeNB1 belongs to the cell under DeNB1)
  • the DeNB1 determines that the inter-cell handover is performed by the same DeNB, it is further determined whether the resource requested by the DeNB1 can be completely accepted by the RN1, and when all of the resources can be accepted, the Path Switch Request message is not forwarded; otherwise, forwarding .
  • steps 606b, 606c, 606d will be executed in sequence
  • DeNB1 If the DeNB1 decides not to forward the Path Switch Request message, it will skip steps 606b, 606c and directly execute 606d.
  • Step 607 When the UE accesses the RN1, the RN1 sends a UE context release message to the DeNB1.
  • the method of the present invention can adjust the sequence of each step according to actual needs.
  • the process of switching between the foregoing steps 601 and 607 that is, the handover process of the user terminal from the base station eNB to the relay RN to which the base station eNB belongs, may be implemented, and the foregoing relay switching is performed.
  • the process is that the UE performs the cell handover in the Intra-eNB, and the handover process is completed in the EUTRAN.
  • the core network does not need to be notified after the handover is completed, and the signaling to the core network is reduced. load.
  • a relay switching method is provided in Embodiment 4 of the present invention.
  • the method is directed to the fourth scenario, that is, the user terminal is described in detail in the embodiment of the present invention.
  • the RN is handed over to another RN
  • the RN and the other RN belong to the same eNB
  • RN1 and RN2 are taken as an example.
  • RN1 and RN2 belong to the same DeNB1.
  • the foregoing relay switching method includes the following steps:
  • Step 701 The source RN performs a handover decision.
  • the RN1 is switched to the RN2 as an example.
  • the source RN is RN1 and the target RN is RN2.
  • the RN1 decides to switch the UE from RN1 to RN2 according to the obtained UE measurement report.
  • Step 702 The RN1 sends a HO request message to the DeNB1.
  • Step 703 The DeNB1 parses the target cell ID in the HO request message, and sends a HO request message to the RN2.
  • the HO request message carries the information of the target cell ID, and the DeNB1 obtains the information of the target cell ID, so as to know whether the target cell is a cell managed by itself, and when the target cell is a cell managed by itself,
  • the HO request message is sent to the corresponding RN, where the RN1 is switched to the RN2 as an example, that is, the target cell is a cell to which the RN2 belongs under the DeNB1, and the DeNB1 is based on the ID of the target cell.
  • Un the HO request message is forwarded to the RN2 at the corresponding Un port.
  • Step 704 The RN2 parses the target cell ID in the HO request message, and returns HO request ACK information to the DeNB1.
  • the RN2 obtains the information of the target cell ID, so as to know whether the target cell is a cell managed by itself, and when the target cell is a cell managed by itself, perform corresponding resource reservation for the target cell.
  • the corresponding resource reservation process is described in detail in step 503 above, and details are not described herein again.
  • Step 705 The DeNB1 returns HO request ACK information to the RN1.
  • Step 706 The RN1 sends an RRC Connection Reconfiguration message to the UE, and triggers the UE to establish an RRC connection with the RN2.
  • Step 707 The UE sends an RRC Connection Reconfiguration Complete message to the RN2, that is, the UE accesses the RN2, and establishes an RRC connection with the RN2.
  • Step 708 The RN2 determines whether a Path Switch Request message needs to be sent to the MME.
  • the RN2 is judged according to the source cell ID and the target cell ID carried in the HO request message. If the cell handover is performed by the same DeNB, the RN2 determines whether it is necessary to send a Path Switch Request message to the MME.
  • the determining process specifically includes: determining, by the RN2, the source d and the resource requested by the area. RN2 does not need to send a Path Switch Request message to the MME, that is, the RN2 does not need to initiate a path update procedure to the core network; otherwise, the RN2 needs to pass the DeNB1 to the MME.
  • the Path Switch Request message is sent, that is, the path update process needs to be initiated to the core network.
  • the step further includes:
  • Step 708a the RN2 sends a Path Switch Request message to the DeNB1, where the PathSwitch Request message needs to carry the GUMMEI information, so that the DeNB1 can perform MME addressing according to the GUMMEI information, that is, the GUMMEI information carries the address information of the MME.
  • the method for carrying the address information of the MME in the Path Switch Request message is also applicable to the handover process between the eNBs, and is switched from other nodes (for example, other eNBs or RNs under other eNBs) to the RN cells under the DeNB.
  • the path switch request message of the GUMMEI information is added as shown in Table 1, and details are not described herein again.
  • the path identifier of the MME may be carried in the Path Switch Request message, and the DeNB1 performs the addressing operation of the MME according to the global unique identifier. No longer.
  • Step 708b The DeNB1 sends a Path Switch Request message to the MME, where the DeNB1 obtains the address of the MME according to the GUMMEI information in the Path Switch Request message from the RN2, and sends a Path Switch Request message to the MME according to the address.
  • Step 708c The MME returns a Path Switch Request Ack message to the DeNB1.
  • Step 708d DeNB1 returns a Path Switch Request Ack message to RN2.
  • the above step 708 is an optional step.
  • the RN2 directly performs the above-mentioned 708a without making a judgment.
  • DeNB1 receives the Path Switch Request sent by RN2 After the message, DeNB1 performs the following judgment process:
  • the DeNB1 determines whether it is necessary to forward the Path Switch Request message to the MME.
  • the determining process specifically includes:
  • the DeNB1 determines whether it is the inter-cell handover under the same DeNB according to the Path Switch Request message, and does not forward the Path Switch Request message if it is the inter-cell handover under the same DeNB 1; otherwise, forwards; (in this embodiment, the RN2 And the cell under the jurisdiction of RN1 belongs to the cell under DeNB1)
  • the DeNB1 determines that the inter-cell handover is performed by the same DeNB, it is further determined whether the resource requested by the RN1 can be completely accepted by the RN2, and when all of the resources can be accepted, the Path Switch Request message is not forwarded; otherwise, the resource is forwarded.
  • steps 708b, 708c, 708d will be executed in sequence
  • DeNB1 decides not to forward the Path Switch Request message, it will skip steps 708b, 708c and directly execute 708d.
  • Step 709 When the UE accesses the RN2, the RN2 sends a UE context release message to the DeNB1.
  • Step 710 The DeNB1 forwards the UE context release message to the RN1.
  • the DeNB1 forwards the UE Context Release message to the RN1 according to the source cell ID information carried in the UE Context Release message.
  • the method of the present invention can adjust the sequence of each step according to actual needs.
  • the process of the process between the foregoing step 701 and the step 710 is performed, that is, the relay handover process of the user terminal by the relay RN to which the base station eNB belongs to another relay RN to which the base station eNB belongs may be implemented.
  • the foregoing handover procedure is that the UE performs cell handover in the Intra-eNB, and the handover process is completed in the EUTRAN.
  • the core network does not need to be notified after the handover is completed, and the handover is reduced.
  • the signaling load on the core network is performed, that is, the relay handover process of the user terminal by the relay RN to which the base station eNB belongs to another relay RN to which the base station eNB belongs.
  • the embodiment of the invention further provides a relay switching system, which includes a source node and a target node, where: And a source node, configured to send, by the UE, a handover request message to the target node, where the handover request message carries the information of the source cell and the information of the target cell;
  • a target node configured to reserve a corresponding resource for the target cell when the target cell is a cell managed by the target node; when the target node is an RN and needs to initiate a path switching process to the core network,
  • the core network sends a path switching request message, where the path switching request message carries a globally unique identifier of the core network; or the target node does not initiate a path switching process to the core network.
  • the target node is further configured to determine, according to the source cell information and the target cell information, whether it is a cell handover under the same eNB; when the determination result is yes, determine whether the resource requested by the source cell can be completely accepted by itself; When the determination result is yes, it is determined that the path switching process does not need to be initiated to the core network; otherwise, it is determined that the path switching process needs to be initiated to the core network.
  • the target RN does not perform the above-mentioned determination whether to initiate the path switching, and directly initiates the path switching process.
  • the DeNB of the RN determines whether the process needs to be terminated. If the process needs to be terminated, the Path Switch Request ACK (Path Switch Request ACK) is generated by the DeNB; otherwise, the DeNB needs to forward the Path Switch process related message between the RN and the core network.
  • the DeNB's judgment method is as follows:
  • the intra-DeNB handover and the resources requested by the source cell can all be accepted by the target RN, and the DeNB terminates the process;
  • the DeNB needs to forward the Path Switch process related message between the RN and the core network.
  • the cell handover of the UE is specifically that the UE performs cell handover in the eNB
  • the cell handover that occurs in the eNB specifically includes: the UE is handed over from the RN to the eNB, and the source node is an RN.
  • the target node is an eNB; the UE is handed over from the eNB to the RN, the source node is an eNB, and the target node is an RN; the UE is switched from the first RN to the second RN, and the source node is the first RN, the target node is a second RN, and the first RN and the second RN belong to the same eNB.
  • a relay switching device is also provided in Embodiment 5 of the present invention.
  • the device is an eNB.
  • the method includes:
  • the receiving module 81 is configured to receive, when the cell handover occurs, the handover request message from the source node, where the handover request message carries the information of the source cell and the information of the target cell, and the determining module 82 is configured to receive according to the The information of the target cell received by the module 81 determines whether the target cell is a cell managed by the target node;
  • the processing module 83 is configured to reserve a corresponding resource for the target cell when the determining module 82 determines that the target cell is a cell managed by the target node;
  • the target node When the target node is an RN and needs to initiate a path switching process to the core network, send a path switching request message to the core network, where the path switching request message carries a globally unique identifier of the core network; or the target The node does not initiate a path switching process to the core network.
  • the processing module 83 is further configured to: determine, according to the handover request message and the resource requested by the source cell, whether a path switching process needs to be initiated to the core network.
  • the processing module 83 is further configured to: determine, according to the source cell information and the target cell information, whether the cell handover is performed by the same eNB; when the cell handover is performed by the same eNB, determine whether the resource requested by the source cell can be When it can be accepted by itself, it is determined that it is not necessary to initiate a path switching process to the core network; when it cannot be fully accepted by itself, it is determined that a path switching process needs to be initiated to the core network.
  • the cell handover of the UE is specifically that the UE performs cell handover within the eNB.
  • the processing module 83 is further configured to: send a path switch to the core network. Requesting a message, and receiving a path switch acknowledgement message from the core network to update resources required by the source cell.
  • the processing module 83 is further configured to: send a path switching request to the eNB. a message, according to the global unique identifier of the core network by the eNB And the path switching request message is forwarded to the core network; and the path switching acknowledgement message forwarded by the core network by the eNB is received to update resources required by the source cell.
  • the processing module 83 further uses And sending, by the eNB, a path switching request message to the eNB, and forwarding, by the eNB, the path switching request message to the core network according to the global unique identifier of the core network; and receiving a path switching confirmation that is sent by the core network by using the eNB. a message to update the resources required by the source cell.
  • the modules of the device of the present invention may be integrated into one or may be deployed separately.
  • the above modules can be combined into one module, or can be further split into multiple sub-modules.
  • the present invention can be implemented by hardware, or can be implemented by means of software plus a necessary general hardware platform.
  • the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including several The instructions are for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the method of the present invention.
  • modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the embodiment, or may be changed in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

Description

一种中继切换方法、 系统和设备 本申请要求于 2009 年 7 月 16 日提交中国专利局, 申请号为 200910089339.2, 发明名称为 "一种中继切换方法、 系统和设备" 的中国 专利申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信技术领域, 特别是涉及一种中继切换方法、 系统和 设备。 背景技术
LTE ( Long Term Evolution, 长期演进)是 3G ( 3rd Generation, 第三 代移动通信系统)的演进, LTE改进并增强了 3G的空中接入技术, 采用 OFDM ( Orthogonal Frequency Division Multiplexing , 正交频分复用 )和 MIMO ( Multiple Input Multiple Output , 多输入多输出)作为无线网络演 进的唯一标准。 LTE能够在 20MHz频谱带宽下, 提供下行 100Mbit/s与 上行 50Mbit/s的峰值速率, 改善了小区边缘用户的性能, 提高了小区容 量, 并降低了系统延迟。 其中, LTE 的技术特征包括高数据速率、 分组 传送、 低延迟、 广域覆盖和向下兼容。 随着移动终端用户数量的迅速增 长, 终端用户的业务容量呈指数增长, 为了满足持续增加的终端用户的 业务需求, 需要提供更大的带宽来满足终端用户的业务和应用所需要的 更高峰值速率。 即在未来的移动通信系统中, 例如在 B3G ( Beyond three Generation, 后三代) 中或 LTE- A ( LTE- Advanced, 高级 LTE ) 中, 系统 将提供更高的峰值数据速率和小区吞吐量, 同时也需要更大的带宽。 目 前 2GHz以下的未分配带宽已经很少, B3G系统(以 B3G系统为例进行 说明)需要的部分或全部带宽只能在更高的频段上, 例如在 3GHz 以上 的频段上进行寻找, 而在实际的应用中, 频段越高, 电波传播衰减的越 快, 传输距离越短; 即在同样的覆盖区域下, 要保证连续覆盖, 则需要 更多的基站。 由于基站具有较高的造价, 当需要很多的基站时, 将会增 加创建网络的成本。 为了解决上述问题, 各个厂商以及标准化组织将中 继 (relay ) 引入到蜂窝系统中, 从而增加覆盖的区域。
在实现本发明的过程中, 发明人发现现有技术中存在以下问题: 用户终端在移动的过程中,将会在中继与中继之间,或中继与 DeNB ( Donor evolved Node B , 服务增强型节点 B )之间发生切换过程, 而现 有的 3GPP规范中并没有定义 LTE-A系统 Intra-DeNB ( DeNB内部)切 换过程, 即没有定义 DeNB和 DeNB下的中继之间, 以及 DeNB下的中 继和 DeNB下的其他中继之间的切换机制。 发明内容
本发明实施例提供一种中继切换方法、 系统和设备, 以实现用户终 端在移动过程中的中继切换过程, 节省网络的信令开销。
为了达到上述目的, 本发明实施例提出了一种中继切换方法, 包括 以下步骤:
UE发生小区切换时, 源节点向目标节点发送切换请求消息, 所述切 换请求消息中携带了源小区的信息和目标小区的信息;
所述目标节点根据所述目标小区的信息判断所述目标小区是否为自 身管理的小区;
所述目标小区为所述目标节点管理的小区时, 所述目标节点为所述 目标小区预留对应的资源;
在所述目标节点为 RN且需要向核心网发起路径倒换过程时, 向所 述核心网发送路径倒换请求消息, 所述路径倒换请求消息中携带所述核 心网的全球唯一标识; 或所述目标节点不向所述核心网发起路径倒换过 程。 本发明实施例提出了一种中继切换系统, 包括:
源节点,用于当 UE发生小区切换时, 向目标节点间发送切换请求消 息, 所述切换请求消息中携带了源小区的信息和目标小区的信息; 目标节点, 用于当所述目标小区为所述目标节点管理的小区时, 为 所述目标小区预留对应的资源; 在所述目标节点为 RN且需要向核心网 发起路径倒换过程时, 向所述核心网发送路径倒换请求消息, 所述路径 倒换请求消息中携带所述核心网的全球唯一标识; 或所述目标节点不向 所述核心网发起路径倒换过程。 本发明实施例提出了一种中继切换设备, 包括:
接收模块,用于当 UE发生小区切换时,接收来自源节点的切换请求 消息, 所述切换请求消息中携带了源小区的信息和目标小区的信息; 判断模块, 用于根据所述接收模块接收的目标小区的信息判断所述 目标小区是否为目标节点管理的小区;
处理模块, 用于当所述判断模块判断出目标小区为目标节点管理的 小区时, 为所述目标小区预留对应的资源;
在所述目标节点为 RN且需要向核心网发起路径倒换过程时, 向所 述核心网发送路径倒换请求消息, 所述路径倒换请求消息中携带所述核 心网的全球唯一标识; 或所述目标节点不向所述核心网发起路径倒换过 程。 与现有技术相比, 本发明具有以下优点: 当 UE发生内部 eNB小区 切换时, 源节点向目标节点间发起 X2 切换请求流程, 切换过程在 EUTRAN内完成, 当源小区请求的资源能够被目标小区全部接纳, 切换 完成后不需要通知核心网, 减少了对核心网的信令负荷。 附图说明
为了更清楚地说明本发明或现有技术中的技术方案, 下面将对本发 明或现有技术描述中所需要使用的附图作筒单地介绍, 显而易见地, 下 面描述中的附图仅仅是本发明的一些附图, 对于本领域普通技术人员来 讲, 在不付出创造性劳动性的前提下, 还可以根据这些附图获得其他的 附图。 图 1为本发明实施例一提出的一种中继切换方法流程图;
图 2为本发明实施例一提出的在 LTE-A系统中引入 RN之后的网络 架构;
图 3为本发明实施例一提出的包含 RN的协议栈架构;
图 4为本发明实施例一提出的中继切换时的组网情况示意图; 图 5为本发明实施例二提出的一种中继切换方法流程图;
图 6为本发明实施例三提出的一种中继切换方法流程图;
图 7为本发明实施例四提出的一种中继切换方法流程图;
图 8为本发明实施例五提出的一种中继切换设备的结构图。 具体实施方式
下面将结合本发明中的附图, 对本发明中的技术方案进行清楚、 完整地描述, 显然, 所描述的仅仅是本发明一部分, 而不是全部的。 基于本发明, 本领域普通技术人员在没有做出创造性劳动前提下所获 得的所有其他发明, 都属于本发明保护的范围。
本发明实施例中, 从其他 eNB角度来看, LTE-A中 RN相当于一个 DeNB下的小区, 当 UE发生内部 DeNB小区切换时, 在源节点和目标节 点间发起 X2切换流程, 切换过程在 EUTRAN内完成, 在特定的场景中 不需要通知核心网, 从而减少了对核心网的信令负荷。
进一步的, 本发明实施例中, 目标节点在判断出目标小区为目标节 点管理的小区时, 需要为所述目标小区预留对应的资源。 在特定的场景 中不需要通知核心网的判断过程具体为通过判断源小区信息和目标小区 信息是否为同一个 eNB下的小区切换; 当判断结果为是时, 进一步判断 源小区请求的资源是否能够被自身全部接纳; 当判断结果为是时, 确定 不需要向核心网发起路径倒换过程, 从而减少了对核心网的信令负荷。
优选的, 当目标节点为 RN时, RN不做上述是否需要发起路径倒换 的判断, 而直接发起路径倒换过程。 RN 的 DeNB 在收到 Path Switch Request (路径倒换请求)后, 确定是否需要终结该过程。 如果需要终止该 过程, 由 DeNB生成 Path Switch Request ACK (路径倒换请求响应) ; 否 则, DeNB需要在 RN与核心网之间转发 Path Switch过程相关的消息。
DeNB的判断方法如下:
如果是 intra-DeNB的切换, 则由 DeNB终结该过程;
或者是 intra-DeNB 的切换且源小区请求的资源能够全部被目标 RN 所接纳, 则由 DeNB终结该过程;
否则, DeNB需要在 RN与核心网之间转发 Path Switch过程相关的 消息。 本发明实施例一提出的一种中继切换方法, 如图 1所示, 包括以下 步骤:
步骤 101 , UE发生小区切换时, 源节点向目标节点间发送切换请求 消息, 所述切换请求消息中携带了源小区的信息和目标小区的信息。
步骤 102, 所述目标节点根据所述目标小区的信息判断所述目标小 区是否为自身管理的小区。
步骤 103 , 所述目标小区为所述目标节点管理的小区时, 所述目标 节点为所述目标小区预留对应的资源;
在所述目标节点为 RN且需要向核心网发起路径倒换过程时, 向所 述核心网发送路径倒换请求消息, 所述路径倒换请求消息中携带所述核 心网的全球唯一标识; 或所述目标节点不向所述核心网发起路径倒换过 程。 进一步的, 所述向核心网发送路径倒换请求消息之前, 还包括: 所述目标节点根据所述切换请求消息和所述源小区请求的资源确定 是否需要向核心网发起路径倒换过程。
所述目标节点根据切换请求消息和所述源小区请求的资源确定是否 需要向核心网发起路径倒换过程具体包括: 所述目标节点根据源小区信 息和目标小区信息判断是否为同一个 eNB 下的小区切换; 当是同一个 eNB 下的小区切换时, 所述目标节点判断源小区请求的资源是否能够被 自身全部接纳; 当能够被自身全部接纳时, 所述目标节点确定不需要向 核心网发起路径倒换过程; 当不能被自身全部接纳时, 所述目标节点确 定需要向核心网发起路径倒换过程。
需要说明的是, 所述 UE发生小区切换具体为所述 UE在 eNB内部 发生小区切换。
进一步的, 所述 UE从 RN向 eNB切换时, 所述源节点为 RN, 所述 目标节点为 eNB, 所述目标节点确定需要向核心网发起路径倒换过程之 后, 还包括: 所述 eNB向核心网发送路径倒换请求消息, 并接收来自所 述核心网的路径倒换确认消息, 以更新所述源小区所需的资源。
所述 UE从 eNB向 RN切换时, 所述源节点为 eNB, 所述目标节点 为 RN, 所述向核心网发送路径倒换请求消息具体包括: 所述 RN向 eNB 发送路径倒换请求消息; 所述 eNB根据所述核心网的全球唯一标识向核 心网转发所述路径倒换请求消息; 所述向核心网发送路径倒换请求消息 之后, 还包括: 所述 eNB接收来自所述核心网的路径倒换确认消息, 并 将所述路径倒换确认消息转发给所述 RN, 以更新所述源小区所需的资 源。
所述 UE从第一 RN向第二 RN切换时, 所述源节点为第一 RN, 所 述目标节点为第二 RN, 所述第一 RN和所述第二 RN属于同一个 eNB, 所述向核心网发送路径倒换请求消息具体包括:所述第二 RN向所述 eNB 发送路径倒换请求消息; 所述 eNB根据所述核心网的全球唯一标识向核 心网转发所述路径倒换请求消息; 所述向核心网发送路径倒换请求消息 之后, 还包括: 所述 eNB接收来自所述核心网的路径倒换确认消息, 并 将所述路径倒换确认消息转发给所述第二 RN, 以更新所述源小区所需的 资源。
可见, 通过使用本发明提供的方法, 当 UE发生内部 eNB小区切换 时, 源节点向目标节点间发起 X2切换请求流程, 切换过程在 EUTRAN 内完成, 当源小区请求的资源能够被目标小区全部接纳, 切换完成后不 需要通知核心网, 减少了对核心网的信令负荷。
优选的, 当目标节点为 RN时, 目标 RN不做上述是否需要发起路径 倒换的判断, 而直接发起路径倒换过程。 RN的 DeNB在收到 Path Switch Request (路径倒换请求)后, 确定是否需要终结该过程。 如果需要终止该 过程, 由 DeNB生成 Path Switch Request ACK (路径倒换请求响应) ; 否 则, DeNB需要在 RN与核心网之间转发 Path Switch过程相关的消息。
DeNB的判断方法如下:
如果是 intra-DeNB的切换, 则由 DeNB终结该过程;
或者是 intra-DeNB 的切换且源小区请求的资源能够全部被目标 RN 所接纳, 则由 DeNB终结该过程;
否则, DeNB需要在 RN与核心网之间转发 Path Switch过程相关的 消息。 本发明实施例二提出的一种中继切换方法, 该方法适用于在引入 RN( Relay Node,中继节点)后的网络架构中,如图 2所示的一种在 LTE-A 系统中引入 RN之后的网络架构, 其中, RN通过 eNB下的 donor (服务 ) cell (小区)接入到核心网; 需要说明的是, RN作为一个 eNB下的中继 节点, 可以看做是该 eNB下的小区, 对于该 RN来说, 该 eNB为 DeNB, 该 DeNB和 RN之间的接口为无线 Un口, 其中, 该 RN和核心网之间并 没有直接的有线接口, 每个 RN可以控制一个或多个小区, 每个 eNB可 以控制和管理一个或多个 RN。 本发明实施例中, 需要建立 RN和 DeNB 之间的 X2接口, 该建立的 X2接口是基于如图 3所示的包含 RN的协议 栈架构进行创建的, 该协议栈架构为 RN、 RN与 DeNB以及 RN与其他 eNB之间的控制面协议栈。
在实际的应用中, 基于图 4所示的组网情况(需要说明的是, 核心 网与 eNB之间是通过 S 1接口连接的, eNB之间是通过 X2接口连接的, RN与 eNB之间是通过 Un接口连接的, UE与 RN之间是通过 Uu接口 连接的); 其中, UE (用户终端)在移动(例如, 从左向右移动)时, 将 存在七种不同的切换情况。( 1 )用户终端由基站 eNBl切换至另一个基站 eNB2, 此时, 源节点和目标节点均为基站; (2 )用户终端由基站 eNBl 切换至 eNB 1所属的中继 RN1或 RN2 , 此时, 源节点为基站, 目标节点 为中继; (3 )用户终端由基站 eNBl所属的中继 RN1或 RN2切换至基站 eNBl ,此时, 源节点为中继, 目标节点为基站;(4 )用户终端由中继 RN1 切换至隶属于同一基站的中继 RN2, 此时, 源节点和目标节点均为中继; ( 5 )用户终端由基站 eNBl切换至另一个基站 eNB2所属的中继 RN3或 RN4,此时, 源节点为基站, 目标节点为中继;(6 )用户终端由基站 eNBl 所属的中继 RN1或 RN2切换至另一基站 eNB2 , 此时, 源节点为中继, 目标节点为基站; ( 7 )用户终端由基站 eNBl所属的中继 RN1或 RN2切 换至另一基站 eNB2所属的中继 RN3或 RN4, 此时, 源节点和目标节点 均为中继。 由于现有的 3GPP规范中没有定义 LTE-A系统 Intra-DeNB切 换过程,即本发明实施例中将分别描述 LTE-A系统 Intra-DeNB切换过程, 该 Intra-DeNB切换过程分别对应于上述的第 2种情况(例如, eNBl向 RN1或 RN2切换)、 第 3种情况(例如, RN1向 eNBl切换)、 第 4种情 况(例如, RN1向 RN2切换)。 本发明实施例将详细描述用户终端从 RN 向 eNB切换时的处理过程, 如图 5所示, 上述的中继切换方法包括以下 步骤:
步骤 501 , 源 RN进行 HO decision ( HandOver decision, 切换判决)。 其中, 本发明实施例是以 RN向 eNB切换为例进行说明的, 如图 4所示, 该源 RN以 RN1为例进行说明的, 则该 eNB为 eNBl , 由于本发明实施 例是 LTE-A 系统 Intra-DeNB切换过程, 则该 eNBl 为该 RN1 的服务 DeNBL 本步骤中, RN1根据获得的 UE测量上报, 决定将 UE从 RN1 切换到 DeNBl。
需要说明的是,该 UE的测量报告为现有协议中所规定的,在移动通 信系统中, 由于 UE的移动性或其他原因, 通信系统要求 UE能够在相邻 小区间进行切换, 而为了能够实现相邻小区间的切换, UE在切换前须测 量备选切换目标的小区的信号质量,而 UE需要将符合测量标准的结果以 测量报告 ( MEASURENET REPORT )的方式上报给网络侧设备, 以供系 统做出切换的决策, 在此不再赘述。
步骤 502, RN1向 DeNBl发送 HO request (切换请求)消息。 其中, 当 RN1获知需要向 DeNBl切换时,该 RN1需要向 DeNBl发送 HO request 消息。
步骤 503 , DeNBl解析该 HO request消息中的目标小区 ID,并向 RN1 返回 HO request ACK (切换请求确认)信息。
其中, 该 HO request消息中携带了目标小区 ID的信息, 该 DeNBl 通过获取该目标小区 ID的信息, 从而获知该目标小区是否为自身管理的 小区, 当该目标小区是自身管理的小区时, 为该目标小区做相应的资源 预留; 当该目标小区不是该 DeNBl管理的小区时, 这种情况不再详细描 述。
需要说明的是, 目标小区是 DeNBl管理的小区时, 该 DeNBl需要 为该目标小区预留对应的资源, 例如, 当目标小区需要 10M的资源时, 该 DeNBl需要为该目标小区预留不小于 10M的资源, 以使目标小区下 的 UE可以正确的进行数据的传输。
本步骤中,该 HO request ACK信息用于向 RN1确认已经接收到来自 该 RN1的 HO request消息。
步骤 504, RN1向 UE发送 RRC ( Radio Resource Control, 无线资源 控制 ) Connection Reconfiguration (重新配置 )消息。 其中, RRC用于处 理 UE和网络侧设备之间控制平面的第三层信息, 包括 RRC建立连接、 RRC重新配置、 RRC维持和 RRC释放等过程。
本步骤中, 由于之前 UE是和该 RN1建立 RRC连接的, 而本发明实 施例中 UE需要切换到 DeNBl , 即 UE需要和 DeNBl重新建立 RRC连 接, 此时, RN1通过向 UE发送 RRC Connection Reconfiguration消息, 从而触发该 UE与 DeNBl建立 RRC连接。
步骤 505, UE向 DeNBl发送 RRC Connection Reconfiguration (重新 配置 ) Complete (完成)消息, 即 UE接入到 DeNBl , 建立与 DeNBl之 间的 RRC连接。
步骤 506, DeNBl判断是否需要向 MME( Mobile Management Entity, 移动管理实体)发送 Path (路径) Switch (倒换) Request消息。 其中, 该 MME为核心网中的网元。
本发明实施例中,该 DeNBl需要根据 HO request消息中携带的源小 区 ID和目标小区 ID判断是否为同一个 DeNB下的小区切换, 即当源小 区 ID和目标小区 ID属于同一个 DeNB时, 为同一个 DeNB下的小区切 换; 当源小区 ID和目标小区 ID不属于同一个 DeNB时, 为不同 DeNB 下的小区切换, 这种情况不再详加描述。
需要说明的是, 在上述步骤 503 中已经获取到了目标小区所属的
DeNB , 本步骤中, 该 DeNB 1可以根据 HO request消息中携带的 RRC上 下文中的源小区 ID获取到源小区所属的 DeNB, 从而判断出目标小区所 属的 DeNB和源小区所属的 DeNB是否相同。
进一步的, 当是同一个 DeNB下的小区切换时, DeNBl将判断是否 需要向 MME发送 Path Switch Request消息, 该判断过程具体包括:
DeNBl判断源小区请求的资源是否能够被 DeNBl全部接纳; 当源小区请求的资源能够被 DeNBl 全部接纳时, DeNBl 不需要向 MME发送 Path Switch Request消息, 即不需要向核心网发起路径更新过 程;
否则, DeNBl需要向 MME发送 Path Switch Request消息, 即需要 向核心网发起路径更新过程。
下面以一个具体的例子来具体说明上述判断源小区请求的资源是否 能够被 DeNBl全部接纳的情况, 例如, 源小区 (UE通过该源小区传输 数据)请求的资源为资源 1、资源 2和资源 3(即 MME实时的通过 DeNBl 向该源小区发送资源 1的数据、 资源 2的数据和资源 3的数据 ), 但在实 际的应用中,若 DeNBl只向源小区发送资源 1的数据和资源 2的数据时, 则表明源小区请求的资源不能够被 DeNBl全部接纳, 而此时 MME是发 送资源 1的数据、 资源 2的数据和资源 3的数据的, 即资源 3的数据是 浪费的。 本发明实施例中, DeNBl通过向 MME发送 Path Switch Request 消息, 使得 MME通过 DeNBl向源小区发送资源 1的数据和资源 2的数 据, 从而节省了系统的资源。 对应的, 若实际的应用中, DeNBl向源小 区发送资源 1的数据、 资源 2的数据和资源 3的数据时, 则表明源小区 请求的资源能够被 DeNBl全部接纳,此时不需要向 MME发送 Path Switch Request消息, 在此不再赘述。 进一步的,若 DeNBl需要向 MME发送 Path Switch Request消息时, 本步骤还包括:
步骤 506a, DeNBl向 MME发送 Path Switch Request消息。
步骤 506b, MME向 DeNBl返回 Path Switch Request Ack消息, 以 更新源小区所需的资源。 其中, 在上面步骤 506 中已经详细描述了该更 新过程, 例如, 在更新之后, MME只需要向源小区发送资源 1的数据和 资源 2的数据 (在更新之前 MME需要向源小区发送资源 1的数据、 资 源 2的数据和资源 3的数据 ) , 从而节省了系统的资源。
步骤 507, 当 UE接入到该 DeNBl时, 该 DeNBl向 RN1发送 UE context (上下文) release (释放) 消息, 从而触发该 RN1解除与该 UE 的 RRC连接。
其中, 本发明方法可以根据实际需要对各个步骤顺序进行调整。 在本发明实施例中, 通过上述步骤 501-步骤 507之间的处理流程, 即可以实现用户终端由基站 eNB所属的中继 RN切换至该基站 eNB的中 继切换过程,而上述的中继切换过程为 UE发生在 Intra-eNB的小区切换, 该切换过程在 EUTRAN ( Evolved Universal Terrestrial Radio Access Network, 演进的通用陆地无线接入网) 内完成, 当源小区请求的资源能 够被 DeNB全部接纳时, 切换完成后不需要通知核心网, 减少了对核心 网的信令负荷。 基于上述的实施例二, 本发明实施例三提出的一种中继切换方法, 该方法是针对上述的第 2种情况, 即本发明实施例将详细描述用户终端 从 eNB向 RN切换时的处理过程, 如图 6所示, 上述的中继切换方法包 括以下步骤:
步骤 601 , eNB进行切换判决。 其中, 本发明实施例是以 eNB向 RN 切换为例进行说明的, 如图 4所示, 该 eNB为 eNBl为例进行说明, 该 RN以 RN1为例进行说明, 由于本发明实施例是 LTE-A系统 Intra-DeNB 切换过程, 则该 eNBl为该 RN1的服务 DeNBl。 本步骤中, DeNBl根据 获得的 UE测量上报, 决定将 UE从 DeNBl切换到 RN1。 步骤 602, DeNBl向 RNl发送 HO request消息。
步骤 603 , RNl解析该 HO request消息中的目标小区 ID,并向 DeNBl 返回 HO request ACK信息。
其中, 该 HO request消息中携带了目标小区 ID的信息, 该 RN1通 过获取该目标小区 ID的信息, 从而获知该目标小区是否为自身管理的小 区, 当该目标小区是自身管理的小区时, 为该目标小区做相应的资源预 留; 当该目标小区不是该 RN1管理的小区时, 这种情况不再详细描述。 需要说明的是, 目标小区是 RN1管理的小区时, 该 RN1需要为该目标小 区预留对应的资源。
步骤 604, DeNBl向 UE发送 RRC Connection Reconfiguration消息, 从而触发该 UE与 RN1建立 RRC连接。
步骤 605, UE向 RN1发送 RRC Connection Reconfiguration Complete 消息, 即 UE接入到 RN1 , 建立与 RN1之间的 RRC连接。
步骤 606, RN1判断是否需要向 MME发送 Path Switch Request消息。 其中, 该 RN1 ^据 HO request消息中携带的源小区 ID和目标小区 ID判 断是否为同一个 DeNB下的小区切换, 当是同一个 DeNB下的小区切换 时, RN1将判断是否需要向 MME发送 Path Switch Request消息,该判断 过程具体包括: RN1判断 DeNBl (或源小区)请求的资源是否能够被 RN1 全部接纳; 当 DeNB 1请求的资源能够被 RN1全部接纳时, RN1不需要 向 MME发送 Path Switch Request消息,即不需要向核心网发起路径更新 过程; 否则, RN1需要通过 DeNBl向 MME发送 Path Switch Request消 息, 即需要向核心网发起路径更新过程。
进一步的,若 RN1需要通过 DeNBl向 MME发送 Path Switch Request 消息时, 本步骤还包括:
步骤 606a, RNl向 DeNBl发送 Path Switch Request消息, 其中, 该 Path Switch Request消息中需要携带 GUMMEI ( Globally Unique MME Identifier, 全球唯一的 MME标识)信息, 使得该 DeNBl 可以 居该 GUMMEI信息进行 MME寻址,即该 GUMMEI信息中携带了 MME的地 址信息。 需要说明的是,通过在 Path Switch Request消息中携带 MME的地址 信息的方法同样适用于 eNB间的切换过程、从其他节点(例如其他 eNB、 或其他 eNB下的 RN )切换到 DeNB下 RN小区的切换场景, 在此不再 赘述。 其中, 该增加了 GUMMEI信息的 path switch request消息如表 1 所示:
表 1
Figure imgf000015_0001
需要进一步说明的是, RN1向 DeNBl发送 Path Switch Request消息 时,还可以在该 Path Switch Request消息中携带该 MME地址的全球唯一 标识, 由 DeNBl根据该全球唯一标识进行 MME的寻址操作, 在此不再 赘述。
步骤 606b, DeNBl向 MME发送 Path Switch Request消息, 其中, 该 DeNBl根据该来自 RN1的 Path Switch Request消息中的 GUMMEI信 息,获知该 MME的地址,并根据该地址向 MME发送 Path Switch Request 消息。 步骤 606c, MME向 DeNBl返回 Path Switch Request Ack消息。 步骤 606d, DeNBl向 RN1返回 Path Switch Request Ack消息。
上述步骤 606为可选步骤, 当步骤 606不执行时, RN1不做判断, 直接执行上述 606a。 当 DeNBl收到 RN1发送来的 Path Switch Request 消息后, DeNBl执行下面的判断过程:
判断是否需要向 MME转发 Path Switch Request消息。 其中, 该判断 过程具体包括:
DeNBl根据 Path Switch Request消息判断是否为同一个 DeNB下的 小区间切换,如果是同一个 DeNB 1下的小区间切换,则不转发 Path Switch Request消息; 否则, 转发; (在本实施例中, RN1和 DeNBl所辖的小区 同属 DeNBl下的小区)
可选的, 在 DeNBl判断了是同一个 DeNB下的小区间切换后, 进一 步判断 DeNBl请求的资源是否能够被 RN1全部接纳, 当能够全部被接 纳时, 则不转发 Path Switch Request消息; 否则, 转发。
如果 DeNBl决定转发 Path Switch Request消息,则步骤 606b, 606c, 606d将依次被执行;
如果 DeNBl 决定不转发 Path Switch Request消息, 则将跳过步骤 606b, 606c, 直接执行 606d。
步骤 607,当 UE接入到该 RN1时,该 RN1向 DeNBl发送 UE context release消息。
其中, 本发明方法可以根据实际需要对各个步骤顺序进行调整。 在本发明实施例中, 通过上述步骤 601-步骤 607之间的处理流程, 即可以实现用户终端由基站 eNB切换至该基站 eNB所属的中继 RN的中 继切换过程,而上述的中继切换过程为 UE发生在 Intra-eNB的小区切换, 该切换过程在 EUTRAN内完成, 当源小区请求的资源能够被 RN1全部 接纳时, 切换完成后不需要通知核心网, 减少了对核心网的信令负荷。 基于上述的实施例二, 本发明实施例四提出的一种中继切换方法, 该方法是针对上述的第 4种情况, 即本发明实施例将详细描述用户终端 从 RN向另一个 RN切换时的处理过程, 该 RN和该另一个 RN属于同一 个 eNB,以 RN1向 RN2为例进行说明, RN1和 RN2属于同一个 DeNBl。 如图 7所示, 上述的中继切换方法包括以下步骤:
步骤 701 , 源 RN进行切换判决。 其中, 本发明实施例是以 RN1向 RN2切换为例进行说明的, 则该源 RN为 RN1 , 目标 RN为 RN2。 本步 骤中, RN1根据获得的 UE测量上报, 决定将 UE从 RN1切换到 RN2。
步骤 702, RN1向 DeNBl发送 HO request消息。
步骤 703 , DeNBl解析该 HO request消息中的目标小区 ID,并向 RN2 发送 HO request消息。
其中, 该 HO request消息中携带了目标小区 ID的信息, 该 DeNBl 通过获取该目标小区 ID的信息, 从而获知该目标小区是否为自身管理的 小区, 当该目标小区是自身管理的小区时, 将该 HO request消息发送到 对应的 RN, 其中, 本发明实施例中是以 RN1向 RN2切换为例进行说明 的, 即该目标小区是 DeNBl下 RN2所属的小区, 该 DeNBl根据该目标 小区的 ID和 Un的对应关系, 在对应的 Un口向 RN2转发该 HO request 消息。
步骤 704, RN2解析该 HO request消息中的目标小区 ID,并向 DeNBl 返回 HO request ACK信息。
其中, 该 RN2通过获取该目标小区 ID的信息, 从而获知该目标小 区是否为自身管理的小区, 当该目标小区是自身管理的小区时, 为该目 标小区做相应的资源预留。 该做相应的资源预留过程在上面步骤 503 中 已详细描述, 在此不再赘述。
步骤 705 , DeNBl向 RN1返回 HO request ACK信息。
步骤 706, RN1向 UE发送 RRC Connection Reconfiguration消息,触 发该 UE与 RN2建立 RRC连接。
步骤 707, UE向 RN2发送 RRC Connection Reconfiguration Complete 消息, 即 UE接入到 RN2, 建立与 RN2之间的 RRC连接。
步骤 708 , RN2判断是否需要向 MME发送 Path Switch Request消息。 其中, 该 RN2 ^据 HO request消息中携带的源小区 ID和目标小区 ID判 断是否为同一个 DeNB下的小区切换, 当是同一个 DeNB下的小区切换 时, RN2将判断是否需要向 MME发送 Path Switch Request消息,该判断 过程具体包括: RN2判断源 d、区请求的资源是否能够被 RN2全部接纳; 当源小区请求的资源能够被 RN2全部接纳时, RN2不需要向 MME发送 Path Switch Request消息, 即不需要向核心网发起路径更新过程; 否则, RN2需要通过 DeNBl向 MME发送 Path Switch Request消息, 即需要向 核心网发起路径更新过程。
进一步的,若 RN2需要通过 DeNB 1向 MME发送 Path Switch Request 消息时, 本步骤还包括:
步骤 708a, RN2向 DeNBl发送 Path Switch Request消息, 其中, 该 Path Switch Request消息中需要携带 GUMMEI信息,使得该 DeNBl可以 根据该 GUMMEI信息进行 MME寻址, 即该 GUMMEI信息中携带了 MME的地址信息。 需要说明的是, 通过在 Path Switch Request消息中携 带 MME的地址信息的方法同样适用于 eNB间的切换过程、 从其他节点 (例如其他 eNB、 或其他 eNB下的 RN )切换到 DeNB下 RN小区的切 换场景,该增加了 GUMMEI信息的 path switch request消息上述的如表 1 所示, 在此不再赘述。
需要进一步说明的是, RN2向 DeNBl发送 Path Switch Request消息 时,还可以在该 Path Switch Request消息中携带该 MME地址的全球唯一 标识, 由 DeNBl根据该全球唯一标识进行 MME的寻址操作, 在此不再 赘述。
步骤 708b, DeNBl向 MME发送 Path Switch Request消息, 其中, 该 DeNBl根据该来自 RN2的 Path Switch Request消息中的 GUMMEI信 息,获知该 MME的地址,并根据该地址向 MME发送 Path Switch Request 消息。
步骤 708c, MME向 DeNBl返回 Path Switch Request Ack消息。 步骤 708d, DeNBl向 RN2返回 Path Switch Request Ack消息。
上述步骤 708为可选步骤, 当步骤 708不执行时, RN2不做判断, 直接执行上述 708a。 当 DeNBl收到 RN2发送来的 Path Switch Request 消息后, DeNBl执行下面的判断过程:
DeNBl判断是否需要向 MME转发 Path Switch Request消息。 其中, 该判断过程具体包括:
DeNBl根据 Path Switch Request消息判断是否为同一个 DeNB下的 小区间切换,如果是同一个 DeNB 1下的小区间切换,则不转发 Path Switch Request消息; 否则, 转发; (在本实施例中, RN2和 RN1所辖的小区同 属于 DeNBl下的小区)
或在 DeNBl判断了是同一个 DeNB下的小区间切换后,进一步判断 RN1请求的资源是否能够被 RN2全部接纳, 当能够全部被接纳时, 则不 转发 Path Switch Request消息; 否则, 转发。
如果 DeNBl决定转发 Path Switch Request消息,则步骤 708b, 708c, 708d将依次被执行;
如果 DeNBl 决定不转发 Path Switch Request消息, 则将跳过步骤 708b, 708c, 直接执行 708d。
步骤 709 ,当 UE接入到该 RN2时,该 RN2向 DeNB 1发送 UE context release消息。
步骤 710, DeNBl向 RN1转发 UE context release消息。其中, DeNBl 根据该 UE Context Release消息中携带的源小区 ID信息, 在对应的 Un 口向 RN1前转 UE Context Release消息。
其中, 本发明方法可以根据实际需要对各个步骤顺序进行调整。 在本发明实施例中, 通过上述步骤 701-步骤 710之间的处理流程, 即可以实现用户终端由基站 eNB所属的中继 RN切换至该基站 eNB所属 的另一个中继 RN的中继切换过程,而上述的中继切换过程为 UE发生在 Intra-eNB的小区切换,该切换过程在 EUTRAN内完成, 当源小区请求的 资源能够被 RN2全部接纳时, 切换完成后不需要通知核心网, 减少了对 核心网的信令负荷。 本发明实施例还提出了一种中继切换系统, 包括源节点和目标节 点, 其中: 源节点,用于当 UE发生小区切换时, 向目标节点间发送切换请求消 息, 所述切换请求消息中携带了源小区的信息和目标小区的信息;
目标节点, 用于当所述目标小区为所述目标节点管理的小区时, 为 所述目标小区预留对应的资源; 在所述目标节点为 RN且需要向核心网 发起路径倒换过程时, 向所述核心网发送路径倒换请求消息, 所述路径 倒换请求消息中携带所述核心网的全球唯一标识; 或所述目标节点不向 所述核心网发起路径倒换过程。
进一步的, 所述目标节点还用于根据源小区信息和目标小区信息判 断是否为同一个 eNB下的小区切换; 当判断结果为是时, 判断源小区请 求的资源是否能够被自身全部接纳; 并当判断结果为是时, 确定不需要 向核心网发起路径倒换过程; 否则, 确定需要向核心网发起路径倒换过 程。
优选的, 当目标节点为 RN时, 目标 RN不做上述是否需要发起路径 倒换的判断, 而直接发起路径倒换过程。 RN的 DeNB在收到 Path Switch Request (路径倒换请求)后, 确定是否需要终结该过程。 如果需要终止该 过程, 由 DeNB生成 Path Switch Request ACK (路径倒换请求响应) ; 否 则, DeNB需要在 RN与核心网之间转发 Path Switch过程相关的消息。
DeNB的判断方法如下:
如果是 intra-DeNB的切换, 则由 DeNB终结该过程;
或者是 intra-DeNB 的切换且源小区请求的资源能够全部被目标 RN 所接纳, 则由 DeNB终结该过程;
否则, DeNB需要在 RN与核心网之间转发 Path Switch过程相关的 消息。
需要说明的是, 所述 UE发生小区切换具体为所述 UE在 eNB内部 发生小区切换,所述 eNB内部发生的小区切换具体包括: 所述 UE从 RN 向 eNB切换, 所述源节点为 RN,所述目标节点为 eNB; 所述 UE从 eNB 向 RN切换, 所述源节点为 eNB , 所述目标节点为 RN; 所述 UE从第一 RN向第二 RN切换, 所述源节点为第一 RN, 所述目标节点为第二 RN, 所述第一 RN和所述第二 RN属于同一个 eNB。 本发明实施例五还提出的一种中继切换设备, 该设备为 eNB, 如图 8所示, 包括:
接收模块 81 , 用于当 UE发生小区切换时, 接收来自源节点的切换 请求消息, 所述切换请求消息中携带了源小区的信息和目标小区的信息; 判断模块 82,用于根据所述接收模块 81接收的目标小区的信息判断 所述目标小区是否为目标节点管理的小区;
处理模块 83,用于当所述判断模块 82判断出目标小区为目标节点管 理的小区时, 为所述目标小区预留对应的资源;
在所述目标节点为 RN且需要向核心网发起路径倒换过程时, 向所 述核心网发送路径倒换请求消息, 所述路径倒换请求消息中携带所述核 心网的全球唯一标识; 或所述目标节点不向所述核心网发起路径倒换过 程。
其中, 所述处理模块 83还用于: 根据所述切换请求消息和所述源小 区请求的资源确定是否需要向核心网发起路径倒换过程。
进一步的, 所述处理模块 83还用于: 根据源小区信息和目标小区信 息判断是否为同一个 eNB下的小区切换; 当是同一个 eNB下的小区切换 时, 判断源小区请求的资源是否能够被自身全部接纳; 当能够被自身全 部接纳时, 确定不需要向核心网发起路径倒换过程; 当不能被自身全部 接纳时, 确定需要向核心网发起路径倒换过程。
需要说明的是, 所述 UE发生小区切换具体为所述 UE在 eNB内部 发生小区切换。
其中, 所述 UE从 RN向 eNB切换时, 所述源节点为 RN , 所述目标 节点为 eNB, 所述中继切换设备为 eNB, 所述处理模块 83还用于: 向核 心网发送路径倒换请求消息, 并接收来自所述核心网的路径倒换确认消 息, 以更新所述源小区所需的资源。
其中, 所述 UE从 eNB向 RN切换时, 所述源节点为 eNB , 所述目 标节点为 RN, 所述中继切换设备为 RN, 所述处理模块 83还用于: 向 eNB发送路径倒换请求消息, 由所述 eNB根据所述核心网的全球唯一标 识向核心网转发所述路径倒换请求消息; 并接收来自所述核心网经过所 述 eNB转发的路径倒换确认消息, 以更新所述源小区所需的资源。
其中, 所述 UE从第一 RN向第二 RN切换时, 所述第一 RN和所述 第二 RN属于同一个 eNB, 所述中继切换设备为第二 RN, 所述处理模块 83还用于: 向 eNB发送路径倒换请求消息, 由所述 eNB根据所述核心 网的全球唯一标识向核心网转发所述路径倒换请求消息; 并接收来自所 述核心网经过所述 eNB转发的路径倒换确认消息, 以更新所述源小区所 需的资源。
其中, 本发明装置的各个模块可以集成于一体, 也可以分离部署。 上述模块可以合并为一个模块, 也可以进一步拆分成多个子模块。
通过以上的实施方式的描述, 本领域的技术人员可以清楚地了解到 本发明可以通过硬件实现, 也可以可借助软件加必要的通用硬件平台的 方式来实现。 基于这样的理解, 本发明的技术方案可以以软件产品的形 式体现出来, 该软件产品可以存储在一个非易失性存储介质 (可以是 CD-ROM, U盘, 移动硬盘等) 中, 包括若干指令用以使得一台计算机 设备(可以是个人计算机, 服务器, 或者网络设备等)执行本发明所述 的方法。
以上所述仅是本发明的优选实施方式, 应当指出, 对于本技术领域 的普通技术人员来说, 在不脱离本发明原理的前提下, 还可以做出若干 改进和润饰, 这些改进和润饰也应视本发明的保护范围。
本领域技术人员可以理解实施例中的装置中的模块可以按照实施例 描述进行分布于实施例的装置中, 也可以进行相应变化位于不同于本实 施例的一个或多个装置中。 上述实施例的模块可以合并为一个模块, 也 可以进一步拆分成多个子模块。
上述本发明序号仅仅为了描述, 不代表实施例的优劣。
以上公开的仅为本发明的几个具体实施例, 但是, 本发明并非局限 于此, 任何本领域的技术人员能思之的变化都应落入本发明的保护范围。

Claims

权利要求
1、 一种中继切换方法, 其特征在于, 包括以下步骤:
UE发生小区切换时, 源节点向目标节点间发送切换请求消息, 所述切换请求消息中携带了源小区的信息和目标小区的信息;
所述目标节点根据所述目标小区的信息判断所述目标小区是否 为自身管理的小区;
所述目标小区为所述目标节点管理的小区时,所述目标节点为所 述目标小区预留对应的资源;
在所述目标节点为 RN且需要向核心网发起路径倒换过程时, 向 所述核心网发送路径倒换请求消息;或所述目标节点不向所述核心网 发起路径倒换过程。
2、 如权利要求 1所述的方法, 其特征在于, 所述向核心网发送 路径倒换请求消息之前, 还包括:
所述目标节点根据所述切换请求消息和所述源小区请求的资源 确定是否需要向核心网发起路径倒换过程。
3、 如权利要求 2所述的方法, 其特征在于, 所述目标节点根据 切换请求消息和所述源小区请求的资源确定是否需要向核心网发起 路径倒换过程具体包括:
所述目标节点根据源小区信息和目标小区信息判断是否为同一 个 eNB下的小区切换;
当是同一个 eNB 下的小区切换时, 所述目标节点判断源小区请 求的资源是否能够被自身全部接纳;
当能够被自身全部接纳时,所述目标节点确定不需要向核心网发 起路径倒换过程;
当不能被自身全部接纳时,所述目标节点确定需要向核心网发起 路径倒换过程。
4、 如权利要求 1-3 任一项所述的方法, 其特征在于, 所述 UE 发生小区切换具体为所述 UE在 eNB内部发生小区切换。
5、 如权利要求 4所述的方法, 所述 UE从 RN向 eNB切换时, 所述源节点为 RN, 所述目标节点为 eNB, 其特征在于, 所述目标节 点确定需要向核心网发起路径倒换过程之后, 还包括:
所述 eNB向核心网发送路径倒换请求消息, 并接收来自所述核 心网的路径倒换确认消息, 以更新所述源小区所需的资源。
6、 如权利要求 4所述的方法, 所述 UE从 eNB向 RN切换时, 所述源节点为 eNB, 所述目标节点为 RN, 其特征在于, 所述向核心 网发送路径倒换请求消息具体包括:
所述 RN向 eNB发送路径倒换请求消息;
所述 eNB根据所述核心网的全球唯一标识向核心网转发所述路 径倒换请求消息;
所述向核心网发送路径倒换请求消息之后, 还包括:
所述 eNB接收来自所述核心网的路径倒换确认消息, 并将所述 路径倒换确认消息转发给所述 RN, 以更新所述源小区所需的资源。
7、如权利要求 4所述的方法,所述 UE从第一 RN向第二 RN切 换时, 所述源节点为第一 RN, 所述目标节点为第二 RN, 所述第一
RN和所述第二 RN属于同一个 eNB, 其特征在于, 所述向核心网发 送路径倒换请求消息具体包括:
所述第二 RN向所述 eNB发送路径倒换请求消息;
所述 eNB根据所述核心网的全球唯一标识向核心网转发所述路 径倒换请求消息;
所述向核心网发送路径倒换请求消息之后, 还包括:
所述 eNB接收来自所述核心网的路径倒换确认消息, 并将所述 路径倒换确认消息转发给所述第二 RN, 以更新所述源小区所需的资 源。
8、 根据权利要求 1所述的方法, 其特征在于, 所述路径倒换请 求消息中携带所述核心网的全球唯一标识。
9、根据权利要求 1所述的方法,其特征在于, RN所归属的 DeNB 接收到路径倒换请求消息后, 确定是否终结路径倒换过程; 如果确定终结所述路径倒换过程,则由所述 DeNB响应所述路径 倒换请求; 否则, 所述 DeNB转发所述路径倒换过程相关的消息。
10、 根据权利要求 9所述的方法, 其特征在于, 所述 DeNB确定 是否终结路径倒换过程的判断方法包括:
判断是否为 intra-DeNB的切换, 如果是, 则由 DeNB终结所述 路径倒换过程。
11、 根据权利要求 10所述的方法, 其特征在于, 所述路径切换 请求消息所请求的资源能够被目标节点 RN接纳。
12、 一种中继切换系统, 其特征在于, 包括:
源节点, 用于当 UE发生小区切换时, 向目标节点间发送切换请 求消息, 所述切换请求消息中携带了源小区的信息和目标小区的信 息;
目标节点, 用于当所述目标小区为所述目标节点管理的小区时, 为所述目标小区预留对应的资源; 在所述目标节点为 RN且需要向核 心网发起路径倒换过程时, 向所述核心网发送路径倒换请求消息, 所 述路径倒换请求消息中携带所述核心网的全球唯一标识;或所述目标 节点不向所述核心网发起路径倒换过程。
13、 如权利要求 12所述的系统, 其特征在于, 所述目标节点还 用于根据源小区信息和目标小区信息判断是否为同一个 eNB 下的小 区切换; 当判断结果为是时, 判断源小区请求的资源是否能够被自身 全部接纳; 并当判断结果为是时, 确定不需要向核心网发起路径倒换 过程; 否则, 确定需要向核心网发起路径倒换过程。
14、 如权利要求 12或 13所述的系统, 其特征在于, 所述 UE发 生小区切换具体为所述 UE在 eNB内部发生小区切换, 所述 eNB内 部发生的小区切换具体包括: 所述 UE从 RN向 eNB切换, 所述源节 点为 RN, 所述目标节点为 eNB; 所述 UE从 eNB向 RN切换, 所述 源节点为 eNB , 所述目标节点为 RN; 所述 UE从第一 RN向第二 RN 切换, 所述源节点为第一 RN, 所述目标节点为第二 RN, 所述第一 RN和所述第二 RN属于同一个 eNB。
15、 一种中继切换设备, 其特征在于, 包括:
接收模块, 用于当 UE发生小区切换时, 接收来自源节点的切换 请求消息,所述切换请求消息中携带了源小区的信息和目标小区的信 息;
判断模块,用于根据所述接收模块接收的目标小区的信息判断所 述目标小区是否为目标节点管理的小区;
处理模块,用于当所述判断模块判断出目标小区为目标节点管理 的小区时, 为所述目标小区预留对应的资源;
在所述目标节点为 RN且需要向核心网发起路径倒换过程时, 向 所述核心网发送路径倒换请求消息;或所述目标节点不向所述核心网 发起路径倒换过程。
16、 如权利要求 15所述的设备, 其特征在于, 所述处理模块还 用于:
根据所述切换请求消息和所述源小区请求的资源确定是否需要 向核心网发起路径倒换过程。
17、 如权利要求 16所述的设备, 其特征在于, 所述处理模块还 用于:
根据源小区信息和目标小区信息判断是否为同一个 eNB 下的小 区切换; 当是同一个 eNB 下的小区切换时, 判断源小区请求的资源 是否能够被自身全部接纳;
当能够被自身全部接纳时,确定不需要向核心网发起路径倒换过 程;当不能被自身全部接纳时,确定需要向核心网发起路径倒换过程。
18、 如权利要求 15-17 任一项所述的设备, 其特征在于, 所述 UE发生小区切换具体为所述 UE在 eNB内部发生小区切换。
19、如权利要求 18所述的设备,所述 UE从 RN向 eNB切换时, 所述源节点为 RN,所述目标节点为 eNB,所述中继切换设备为 eNB, 其特征在于, 所述处理模块还用于: 向核心网发送路径倒换请求消息,并接收来自所述核心网的路径 倒换确认消息, 以更新所述源小区所需的资源。
20、如权利要求 18所述的设备,所述 UE从 eNB向 RN切换时, 所述源节点为 eNB, 所述目标节点为 RN, 所述中继切换设备为 RN, 其特征在于, 所述处理模块还用于:
向 eNB发送路径倒换请求消息, 由所述 eNB根据所述核心网的 全球唯一标识向核心网转发所述路径倒换请求消息;
并接收来自所述核心网经过所述 eNB转发的路径倒换确认消息, 以更新所述源小区所需的资源。
21、如权利要求 18所述的设备, 所述 UE从第一 RN向第二 RN 切换时, 所述第一 RN和所述第二 RN属于同一个 eNB , 所述中继切 换设备为第二 RN, 其特征在于, 所述处理模块还用于:
向 eNB发送路径倒换请求消息, 由所述 eNB根据所述核心网的 全球唯一标识向核心网转发所述路径倒换请求消息;
并接收来自所述核心网经过所述 eNB转发的路径倒换确认消息, 以更新所述源小区所需的资源。
22、 根据权利要求 15所述的设备, 其特征在于, 所述路径倒换 请求消息中携带所述核心网的全球唯一标识。
23、 根据权利要求 15所述的设备, 其特征在于, RN所归属的 DeNB接收到路径倒换请求消息后, 确定是否终结路径倒换过程; 如果确定终结所述路径倒换过程,则由所述 DeNB相应所述路径 倒换请求; 否则, 所述 DeNB转发所述路径倒换过程相关的消息。
24、 根据权利要求 23所述的设备, 其特征在于, 所述 DeNB确 定是否终结路径倒换过程的判断方法包括:
判断是否为 intra-DeNB的切换, 如果是, 则由 DeNB终结所述 路径倒换过程。
25、 根据权利要求 15所述的设备, 其特征在于, 所述路径切换 请求消息所请求的资源能够被目标节点 RN接纳。
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