WO2012142895A1

WO2012142895A1 - Method and system for handling wireless relay node handover

Info

Publication number: WO2012142895A1
Application number: PCT/CN2012/072616
Authority: WO
Inventors: 陈思; 奚进; 陈琳; 翟恒星
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-04-18
Filing date: 2012-03-20
Publication date: 2012-10-26
Also published as: CN102752819A

Abstract

Disclosed are a method and system for handling a wireless relay node handover. The method comprises: a wireless relay node receiving a message from a source host base station, the message is for use in instructing the handover of the wireless relay node to a target host base station; and the wireless relay node transmitting context information of a user equipment governed by self to the target host base station. In the present invention, the wireless relay node is used to transmit the context information of the user equipment governed by self to the target host base station, thereby allowing the target host base station to perform admission control on the basis of the context of the user equipment, thus ensuring the accuracy of the admission control result.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a method and system for processing a wireless relay node handover. BACKGROUND The 3rd Generation Partnership Project (3GPP) is a long-term evolution

The Long-Term Evolution (LTE) project is the largest new technology development project initiated by 3GPP in the past two years. This is based on Orthogonal Frequency Division Multiplexing (OFDM) / Frequency Division Multiple Access ( Frequency Division Multiple Access (FDMA) is the core technology that can be considered as "quasi 4G" technology. The main performance objectives of the 3GPP LTE project include: It can provide downlink 100Mbps and uplink 50Mbps peak rate in 20MHz spectrum bandwidth; Improve cell edge user performance; Improve cell capacity; Reduce system delay, user plane internal one-way transmission delay is less than 5ms The control plane migrates from sleep state to active state for less than 50ms, and the migration time from the resident state to the active state is less than 100ms; cell coverage supporting lOOKm radius; capable of providing access services greater than 100kbps for 350Km/h high-speed mobile users Supports paired or unpaired spectrum and flexible configuration of multiple bandwidths from 1.25 MHz to 20 MHz. LTE-A is an abbreviation of LTE-Advanced and is a subsequent evolution of LTE technology. LTE is commonly known as 3.9G, which shows that the technical indicators of LTE are very close to 4G. Compared with 4G, LTE and other peaks have slightly exceeded the 4G requirements, and other technical indicators have met the requirements of the 4G standard. The overall design of LTE-A, which brings LTE to 4G, far exceeds the minimum demand of 4G. In June 2008, 3GPP completed the LTE-A technical requirements report and proposed the minimum requirements for LTE-A: downlink peak rate of 1 Gbps, uplink peak rate of 500 Mbps, and uplink and downlink peak spectrum utilization of 15 Mbps/Hz and 30 Mbps/ respectively. Hz. These parameters are already much higher than the minimum technical requirements of the International Telecommunications Union-Telecommunications Standardization Sector (ITU-T), which has obvious advantages. Key technologies of LTE-A include carrier aggregation, multi-point cooperation, relay transmission, multi-antenna enhancement, wireless relay, and self-organizing networks. Among them, wireless relay technology is applied to temporary wireless coverage requirements. For example, due to terrain or environment, it is impossible to assume the area where the wired backbone network of the ordinary base station is connected, or the area or hot spot that covers the dead corner. Base station equipment with line connections solves this coverage requirement at a high cost, and therefore introduces a wireless relay technology to solve. 1 is a schematic diagram of a wireless relay node architecture according to the related art. As shown in FIG. 1, a wireless relay node (Relay Node, hereinafter referred to as RN) is connected to a base station of an existing network by using a wireless signal, and is covered by itself. The user equipment (User Equipment, UE) provides services to achieve coverage expansion, reduce coverage dead angles, and transfer hotspot load. A base station that is wirelessly connected to the RN is called a donor base station (Donor eNodeB, abbreviated as De B), and a radio link between the DeNB and the RN is called a backhaul link, and an air interface between the De B and the RN ( Referred to as the air interface) is called the Un interface. The radio link between the RN and the UE is called an Access Link, and the air interface between the RN and the UE is called a Uu interface. For the UE served by the RN, the RN acts as an eNB; and for the DeNB connected to the RN, the RN acts as a UE. The downlink data first arrives at the DeNB, and the DeNB transmits the downlink data to the RN, and then the RN transmits the downlink data to the UE, and the uplink data transmission is reversed. The relay node can also be applied to high-speed mobile scenes, for example, applied to in-vehicle devices to provide stable wireless coverage for wireless communication devices in the vehicle. In this scenario, as the vehicle moves, the relay node switches between different host base stations. The handover process may be classified into a core network handover (for example, S1 handover) or a direct handover (for example, X2 handover) according to the ground-side signaling routing manner. 2 is a flow chart of a core network handover according to the related art. As shown in FIG. 2, the core network handover procedure may be simply summarized as follows: The source base station determines, according to the measurement report of the UE, that a UE needs to initiate a handover, and communicates with the core network. The interface (for example, S1) sends a handover request command to the core network, where the command carries the context information of the UE. After receiving the core network, the core network determines the location of the target base station by using the information carried in the command, and sends a handover request to the target base station. The target base station reads the context information of the UE therein, and performs admission control on the UE. After the target base station determines that the UE can access the UE, it sends a handover request acknowledgement message to the core network, and the core network forwards the packet to the source base station to start the handover process of the UE in the air interface. 3 is a flow chart of direct interface switching according to the related art. As shown in FIG. 3, the direct handover procedure may be simply summarized as follows: The source base station determines, according to the measurement report of the UE, that a UE needs to initiate a handover, and uses a direct interface between the base stations ( For example, X2) sends a handover request command to the target base station, where the command carries the context information of the UE. The target base station reads the information therein and performs admission control on the UE. After determining that the UE can be accessed, the response message is sent to the source base station, and the source base station starts the handover process of the UE in the air interface. In the foregoing handover process, whether the core network handover or the direct handover carries the context information of the UE in the source base station in the handover request command, the context information includes: a Cell Radio Network Temporary Identifier (referred to as a Cell Radio Network Temporary Identifier) For the C-RNTI, the measurement configuration of the UE, the Signaling Radio Bearer (SRB) configuration, the Data Radio Bearer (DRB) configuration, and the UE capability. The target base station needs to determine whether to allow the UE to access according to the above information, as well as its own configuration and radio resource status. This process is also called Admission Control. In a scenario such as a vehicle, the relay node moves simultaneously with the terminal it administers. At this time, if the target host base station performs admission control only according to the context of the relay node, the admission control result is inaccurate. SUMMARY OF THE INVENTION The present invention provides a method and system for processing a wireless relay node handover to at least solve the problem in the related art that the target host base station performs admission control based only on the context of the wireless relay node. In order to achieve the above object, according to an aspect of the present invention, a processing method of wireless relay node switching is provided. The method for processing a wireless relay node handover according to the present invention includes: the wireless relay node receives a message from a source host base station, wherein the message is used to instruct the wireless relay node to switch to the target host base station; the wireless relay node dictates itself The context information of the user equipment is sent to the target host base station. After the wireless relay node sends the context information of the user equipment under its jurisdiction to the target host base station, the method further includes: the target host base station receiving the context information of the user equipment managed by the wireless relay node; the target host base station according to the context Information, accepting control of user equipment under the jurisdiction of the wireless relay node. The target host base station performs admission control on the user equipment of the wireless relay node according to the context information, including one of the following: For the user equipment with successful admission control, the target host base station maps the radio bearer of the user equipment to the wireless relay node. On the radio bearer; for the user equipment that fails the admission control, the target host base station notifies the wireless relay node of the information of the user equipment, or initiates the release of the user equipment by the process with the core network. The message is a RRC connection reconfiguration message, and the wireless relay node sends the context information of the user equipment under its jurisdiction to the target host base station through the RRC connection reconfiguration complete message. The context information of the user equipment includes at least one of the following: a cell radio network temporary identifier of the user equipment, a measurement configuration of the user equipment, a signaling radio bearer configuration of the user equipment, a data radio bearer configuration of the user equipment, a capability information of the user equipment, and a user. The mobility management entity of the device's current service. In order to achieve the above object, according to another aspect of the present invention, a processing system for wireless relay node switching is provided. The processing system for wireless relay node handover according to the present invention includes a wireless relay node, a source host base station, and a target host base station, wherein the wireless relay node includes: a receiving module configured to receive a message from the source host base station, The message is used to indicate that the wireless relay node switches to the target host base station; and the sending module is configured to send the context information of the user equipment managed by the wireless relay node to the target host base station. The target host base station includes: a receiving module, configured to receive context information of a user equipment managed by the wireless relay node; and an admission control module configured to perform admission control on the user equipment under the jurisdiction of the wireless relay node according to the context information. The admission control module includes: a mapping submodule, configured to map the radio bearer of the user equipment to the radio bearer of the radio relay node for the user equipment with successful admission control; and notify the submodule, set to the user equipment that fails the admission control And the information about the user equipment is notified to the wireless relay node; the initiating sub-module is configured to initiate the release of the user equipment by using a process with the core network for the user equipment that fails the admission control. The message is a RRC connection reconfiguration message, and the sending module sends the context information of the user equipment under its jurisdiction to the target host base station through the RRC connection reconfiguration complete message. The context information of the user equipment includes at least one of the following: a cell radio network temporary identifier of the user equipment, a measurement configuration of the user equipment, a signaling radio bearer configuration of the user equipment, a data radio bearer configuration of the user equipment, a capability information of the user equipment, and a user. The mobility management entity of the device's current service. The invention transmits the context information of the user equipment under its jurisdiction to the target host base station by the wireless relay node, so that the target host base station can also perform admission control according to the context of the user equipment, thereby ensuring the accuracy of the admission control result. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of a wireless relay node architecture according to the related art; FIG. 2 is a flow chart of a core network handover according to the related art; FIG. 3 is a flowchart of direct interface switching according to the related art; 4 is a flowchart of a processing method of a wireless relay node handover according to an embodiment of the present invention; FIG. 5 is a flowchart according to a preferred embodiment of the present invention; 6 is a structural block diagram of a processing system for wireless relay node handover according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. The invention provides a processing method for wireless relay node switching. FIG. 4 is a flowchart of a method for processing a wireless relay node handover according to an embodiment of the present invention. As shown in FIG. 4, the following steps S402 to S404 are included. Step S402, the wireless relay node receives a message from the source host base station, where the message is used to instruct the wireless relay node to switch to the target host base station. Step S404, the wireless relay node sends the context information of the user equipment under its jurisdiction to the target host base station. In the related art, the target host base station performs admission control only according to the context of the wireless relay node. In the embodiment of the present invention, the wireless relay node sends the context information of the user equipment under its jurisdiction to the target host base station, so that the target host base station can also perform admission control according to the context of the user equipment, thereby ensuring accurate reception control results. Sex. Preferably, after the wireless relay node sends the context information of the user equipment under its jurisdiction to the target host base station, the method further includes: the target host base station receiving the context information of the user equipment managed by the wireless relay node; The base station performs admission control on the user equipment under the jurisdiction of the wireless relay node according to the context information. Preferably, the target host base station performs admission control on the user equipment of the wireless relay node according to the context information, including one of the following: For the user equipment with successful admission control, the target host base station maps the radio bearer of the user equipment to the wireless device. On the radio bearer of the node; for the user equipment that fails the admission control, the target host base station notifies the wireless relay node of the information of the user equipment, or initiates the release of the user equipment by the process with the core network. Preferably, the message is a radio resource control connection reconfiguration message, and the wireless relay node sends the context information of the user equipment under its jurisdiction to the target host base station by using the radio resource control connection reconfiguration complete message. Preferably, the context information of the user equipment includes at least one of the following: a Cell Radio Network Temporary Identifier (C-RNTI) of the user equipment, a measurement configuration of the user equipment, and a signaling radio bearer of the user equipment ( Signaling Radio Bearer, referred to as SRB) configuration, user design The data radio bearer (DRB) configuration, the capability information of the user equipment, and the mobility management entity (Mobile Management Entity, MME for short) of the current service of the user equipment. The implementation process of the embodiment of the present invention will be described in detail below with reference to examples. The preferred embodiment describes a group of terminals (UEs) accessing a wireless relay node RN over a wireless connection. The RN is handed over to the target host base station Target DeNB by the source host base station Source DeNB, and the RN carries the context of the governed UE in the RRC interaction signaling with the Target DeNB. FIG. 5 is a flow chart according to a preferred embodiment of the present invention. As shown in FIG. 5, the following steps S502 to S510 are included. Step S502, the RN detects the Source De B according to the configuration of the OAM and the surrounding wireless signals. The RN initiates an RRC connection setup request to the Source DeNB and indicates to the Source DeNB that it is a wireless relay node. The source DeNB selects the MME for the RN and establishes an E-UTRAN Radio Access Bearer (E-RAB). In this process, the MME performs device identity verification on the RN. After the verification is passed, the Source DeNB allocates dedicated radio resources and data radio bearers to the RNs on the air interface. On this bearer, the RN establishes a connection with the OAM to obtain and update parameters, and establishes an S1 and X2 interface with the RN on the bearer. At this point, the RN starts to establish its own cell and broadcasts the system on the air interface. Step S504, the group UE detects from the air interface and camps in the cell established by the RN. After the UE enters the connected state, the UE establishes an RRC connection with the RN, and the RN allocates dedicated resources such as C-RNTI, configuration measurement, SRB, and DRB to the UE. The RN, in the identity of e B, requests the establishment of an E-RAB for this UE through SI Initial UE Message signaling. The signaling is forwarded by the DeNB to the corresponding MME. The MME establishes an E-RAB for the UE through the SI Initial Context Setup signaling, and carries the capability information of the UE. The RN saves the context information of the connected UE obtained in the foregoing process, including the UE radio network temporary identifier, the UE measurement configuration, the signaling radio bearer configuration, the data radio bearer configuration, the UE capability, the UE current Serving MME, and the like. One or more). Step S506, as the RN moves, the Source DeNB determines, by using the measurement report, that the RN is approaching the target host base station Target De B. The source DeNB initiates a direct interface handover X2 Handover Request message to the Target DeNB, where the message indicates that the RN is a wireless relay node and carries the context of the RN. The Target DeNB determines that the RN can be admitted according to the context of the RN, and returns an X2 Handover Request Acknowledge message to the Source DeNB. Step S508, the Source DeNB instructs the RN to switch to Target De B through an RRC RRCConnectionReconfiguration message. The signaling carries the necessary air interface configuration that the RN accesses to the Target DeNB, for example. For example, a new C-RNTI, system broadcast information, a dedicated random access channel preamble (RACH preamble), and the like. Step S510, the RN synchronizes with the Target DeNB according to the new radio configuration, and sends an RRC RRCConnectionReconfigurationComplete message to the Target DeNB. In this message, the RN simultaneously holds the context of the group of UEs it occupies in step 102. After receiving the set of contexts, Target De B determines whether all or part of the UEs can be accepted according to its own radio resources. For determining the UE that can be admitted, the Target DeNB needs to determine the correspondence between the E-RAB of the UE and the E-RAB that it establishes for the RN according to the configuration. For the UE that is determined to be unacceptable, the Target DeNB saves according to the context. The information of the Serving MME of the UE initiates the release of the context of the UE to the MME; or the Target DeNB notifies the RN by using a control plane message (for example, an RRC procedure, an S1 process or an X2 process) between the RN and the RN. The RN performs a further release process. It should be noted that, in addition to the wireless relay technology, the present invention can also be applied to other technologies. For example, a device such as an L1 Repeater may also carry a group of UEs to perform handover. In the group Mobility scenario, the present invention is used. The method can also implement that the target host base station can also perform admission control according to the context of the user equipment, thereby ensuring the accuracy of the admission control result. It should be noted that the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and, although the logical order is shown in the flowchart, in some cases, The steps shown or described may be performed in an order different than that herein. The embodiment of the invention further provides a processing system for wireless relay node switching, and the wireless relay node switching processing system can be used to implement the above method. 6 is a structural block diagram of a processing system for handover of a wireless relay node according to an embodiment of the present invention. As shown in FIG. 6, the method includes a wireless relay node 62, a source host base station 64, and a target host base station 66, wherein the wireless relay node 62 includes a receiving module 622 and a transmitting module 624. The structure is described in detail below. The receiving module 622 is configured to receive a message from the source host base station 64, wherein the message is used to instruct the wireless relay node 62 to switch to the target host base station 66; the sending module 624 is connected to the receiving module 622, and is configured to set the wireless relay node 62. The context information of the user equipment under its jurisdiction is sent to the target host base station 66 indicated by the message received by the receiving module 622. Preferably, the target host base station 66 includes a receiving module 662 and an admission control module 664, the structure of which is described in detail below. The receiving module 662 is configured to receive context information of the user equipment under the jurisdiction of the wireless relay node 62. The admission control module 664 is coupled to the receiving module 662, and configured to be used by the wireless relay node 62 according to the context information received by the receiving module 662. User equipment under its jurisdiction is subject to admission control. Preferably, the admission control module 664 includes a mapping sub-module 6642, a notification sub-module 6644, and an initiating sub-module 6646, the structure of which is described in detail below. The mapping sub-module 6642 is configured to map the radio bearer of the user equipment to the radio bearer of the radio relay node 62 for the user equipment with successful admission control; the notification sub-module 6644 is set to be used for the user equipment that fails the admission control. The information of the user equipment informs the wireless relay node 62; the initiating sub-module 6646 is configured to initiate the release of the user equipment by the process with the core network for the user equipment that fails the admission control. Preferably, the message is a radio resource control connection reconfiguration message, and the sending module 624 sends the context information of the user equipment under its jurisdiction to the target host base station 66 through the radio resource control connection reconfiguration complete message. Preferably, the context information of the user equipment includes at least one of the following: a cell radio network temporary identifier of the user equipment, a measurement configuration of the user equipment, a signaling radio bearer configuration of the user equipment, a data radio bearer configuration of the user equipment, and a capability of the user equipment. Information, the mobility management entity of the current service of the user device. It should be noted that the processing system of the wireless relay node switching described in the device embodiment corresponds to the foregoing method embodiment, and the specific implementation process has been described in detail in the method embodiment, and details are not described herein again. In summary, according to the above embodiments of the present invention, a processing method and system for wireless relay node switching are provided. The invention transmits the context information of the user equipment under its jurisdiction to the target host base station by the wireless relay node, so that the target host base station can also perform admission control according to the context of the user equipment, thereby ensuring the accuracy of the admission control result. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for processing a wireless relay node handover, comprising:

The wireless relay node receives a message from the source host base station, where the message is used to indicate that the wireless relay node switches to the target host base station;

The wireless relay node sends context information of the user equipment under its jurisdiction to the target home base station.

The method according to claim 1, wherein after the wireless relay node sends the context information of the user equipment under its jurisdiction to the target host base station, the method further includes:

Receiving, by the target host base station, context information of a user equipment managed by the wireless relay node;

And the target host base station performs admission control on the user equipment under the jurisdiction of the wireless relay node according to the context information.

The method according to claim 2, wherein the target host base station performs admission control on the user equipment under the jurisdiction of the wireless relay node according to the context information, including one of the following:

For the user equipment with successful admission control, the target host base station maps the wireless bearer of the user equipment to the radio bearer of the wireless relay node;

For the user equipment that fails to accept the control, the target host base station notifies the wireless relay node of the information of the user equipment, or initiates release of the user equipment by using a process with the core network.

The method according to any one of claims 1 to 3, wherein the message is a radio resource control connection reconfiguration message, and the radio relay node controls the connection reconfiguration completion message through the radio resource control The context information of the user equipment is sent to the target host base station.

The method according to any one of claims 1 to 3, wherein the context information of the user equipment comprises at least one of: a cell radio network temporary identifier of the user equipment, and a measurement configuration of the user equipment. The signaling radio bearer configuration of the user equipment, the data radio bearer configuration of the user equipment, the capability information of the user equipment, and the mobility management entity of the current service of the user equipment.

A processing system for a wireless relay node handover, comprising: a wireless relay node, a source host base station, and a target host base station, where the wireless relay node includes: a receiving module, configured to receive a message from the source host base station, where the message is used to indicate that the wireless relay node switches to the target host base station;

And a sending module, configured to send context information of the user equipment managed by the wireless relay node to the target host base station. The system according to claim 6, wherein the target host base station comprises:

The receiving module is configured to receive context information of the user equipment managed by the wireless relay node, and the admission control module is configured to perform admission control on the user equipment managed by the wireless relay node according to the context information. The system according to claim 7, wherein the admission control module comprises: a mapping sub-module, configured to map a radio bearer of the user equipment to a radio bearer of the radio relay node for a user equipment with successful admission control Upper

Notifying the sub-module, the user equipment is configured to notify the wireless relay node of the information of the user equipment;

The initiating sub-module is configured to initiate release of the user equipment by a process with the core network for the user equipment that fails the admission control. The system according to any one of claims 6 to 8, wherein the message is a radio resource control connection reconfiguration message, and the sending module controls the reconfiguration completion message by using a radio resource control to control the user equipment under its jurisdiction Context information is sent to the target host base station. The system according to any one of claims 6 to 8, wherein the context information of the user equipment comprises at least one of: a cell radio network temporary identifier of the user equipment, a measurement configuration of the user equipment, The signaling radio bearer configuration of the user equipment, the data radio bearer configuration of the user equipment, the capability information of the user equipment, and the mobility management entity of the current service of the user equipment.