WO2012142823A1 - 小区切换方法、设备及系统 - Google Patents

小区切换方法、设备及系统 Download PDF

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Publication number
WO2012142823A1
WO2012142823A1 PCT/CN2011/081967 CN2011081967W WO2012142823A1 WO 2012142823 A1 WO2012142823 A1 WO 2012142823A1 CN 2011081967 W CN2011081967 W CN 2011081967W WO 2012142823 A1 WO2012142823 A1 WO 2012142823A1
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Prior art keywords
base station
handover
node
target base
relay node
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PCT/CN2011/081967
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English (en)
French (fr)
Inventor
陈思
陈琳
奚进
翟恒星
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中兴通讯股份有限公司
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Publication of WO2012142823A1 publication Critical patent/WO2012142823A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates to the field of communications, and in particular to a cell handover method, device, and system.
  • a cell handover method, device, and system In a mobile communication system, in order to meet the mobility requirement, after the user equipment (UE, User Equipment) establishes a connection between the serving cell, that is, the source cell and the network, the UE still needs to perform signal quality on the serving cell and the neighboring cell. Measure, in order to select a more suitable cell for handover.
  • the target cell needs to implement access control for the UE, and if the resource allows, the handover request of the UE is allowed.
  • the specific handover process is shown in FIG.
  • the handover procedure of FIG. 1 includes the following steps: Step 101: A UE in a serving cell, that is, a source cell in a connected state, performs measurement according to a measurement configuration, and when the UE measures a phase that satisfies a reporting condition When the neighboring cell is used, the UE reports a measurement report to the source base station to which the source cell belongs.
  • the measurement report refers to a measurement report in which the signal quality of the neighboring cell is higher than a predetermined offset of the serving cell, or a measurement report in which the signal quality of the neighboring cell is higher than a predetermined threshold.
  • Step 102 After receiving the measurement report, the source base station to which the source cell belongs, makes a handover decision, and needs to switch the UE to the neighboring base station, that is, the target cell where the target base station is located, and the source base station sends a handover request message to the target base station.
  • the source base station sends a handover request message to the target base station.
  • the QoS (Quality of Service) parameter of the radio access bearer (E-RAB, E-UTRAN Radio Access Bearer) established by the UE is included in the handover request message.
  • E-RAB E-UTRAN Radio Access Bearer
  • Step 103 After receiving the handover request message, the target base station performs access control according to the QoS parameter included in the handover request message, and allows the handover of the UE to allocate resources for the UE when the resource is allowed.
  • Step 104 The target base station sends a handover request acknowledgement message to the source base station, where the allocated resource information is included.
  • Step 105 After receiving the handover request acknowledgement message, the source base station sends a handover command to the UE.
  • the source base station transmits a handover command to the UE by using a radio resource control (RRC, Radio Resource Control) connection reconfiguration message carrying mobility control information (mobilityControlInfo).
  • RRC Radio Resource Control
  • Step 106 The UE acquires synchronization with the target cell, initiates random access in the target cell, and sends handover complete signaling to the target base station. At this point, the UE switches to the target cell.
  • Step 102 104 is referred to as a handover preparation process.
  • the target base station implements access control according to the QoS parameters of the E-RAB established by the UE, where the QoS parameters include QoS Class Identifier (QCI, QoS Class Identifier) allocation and reservation priority (ARP, Allocation and Retention Priority) 0
  • QoS parameters include QoS Class Identifier (QCI, QoS Class Identifier) allocation and reservation priority (ARP, Allocation and Retention Priority) 0
  • QoS parameters also include the uplink GBR and the downlink GBR, and the maximum bit rate of the uplink and downlink (MBR, Maximum). Bit Rate), the maximum bit rate can be greater than or equal to the GBR.
  • GBR can also be called guaranteed bit rate
  • MBR can also be called maximum bit rate.
  • Step 201 The UE in the serving cell, that is, the source cell in the connected state, performs measurement according to the measurement configuration. When the UE detects the neighboring cell that meets the reporting condition, the UE reports the measurement report to the source base station to which the source cell belongs.
  • the core network element such as the mobility management entity, Mobility Management Entity, MME for short
  • Step 202 After receiving the measurement report, the source base station to which the source cell belongs receives the handover decision, and needs to switch the UE to the target cell where the target base station is located, but the X2 interface does not exist between the source base station and the target base station, The source base station sends a handover request message to the MME, where the handover request message includes a quality of service (QoS) parameter of the radio access bearer (E-RAB, E-UTRAN Radio Access Bearer) established by the UE.
  • QoS quality of service
  • E-RAB E-UTRAN Radio Access Bearer
  • Step 204 After receiving the handover request message, the target base station performs access control according to the QoS parameter included in the handover request message, and allows the handover of the UE to allocate resources for the UE when the resource is allowed.
  • Step 205 The target base station sends a handover request acknowledgement message to the MME, where the allocated resource information is included.
  • Step 206 The MME forwards the handover request acknowledgement message to the source base station.
  • Step 202 206 is referred to as a handover preparation process.
  • 3GPP Third Generation Partnership Projects
  • LTE-Advanced Long-Term Evolution Advance
  • Wireless Relay technology one of the technologies in LTE-Advanced, aims to extend the coverage of cells, reduce dead zones in communications, balance load, transfer traffic in hotspots, and save UEs' transmit power. As shown in FIG.
  • a RN (Relay Node) provides a similar function and service to a user terminal UE accessing its cell, and the wireless interface between the two is called an "access link" ( Access Link), also known as the Uu interface.
  • the RN accesses an e B serving it in a manner similar to a normal UE through a radio interface, and the eNB serving the RN is referred to as a donor base station (Donor eNB, abbreviated as DeNB).
  • the wireless interface between RN and De B is called "Backhaul Link", also known as Un port. According to whether the center frequency used by the RN in the Un port and the Uu port is the same, the RN can be divided into two modes: “inband” and "outband".
  • Inband Relay means that the RN uses the same frequency in the Un port and the U U port.
  • the Outband Relay means that the RN uses different frequencies in the Un port and the Uu port.
  • the first type of relay Typel Relay and the second type of relay Type2 Relay are defined according to whether they have their own independent cells or as part of the DeNB.
  • Typel Relay means that the RN can create its own independent cells. These cells have their own physical cell identifier (Physical Cell ID, PCI for short). The RN works like a base station in its own cell, such as sending reference signals and scheduling the UE. Etc.; Type2 Relay does not have its own independent cell and PCI, but only assists the DeNB for data transmission.
  • the standard also defines "Type la" and "Type lb" Relay. Similar to the Type 1 Relay, they all have independent cells and PCI, and also independently transmit and receive control signals. When the relay node moves, it is not enough for the target base station to implement access control based only on the QoS parameters. For example, for the Type l Relay, if the target base station does not have the function of configuring the Un subframe for the RN, even if the target base station has sufficient resources, the RN cannot be normally operated after being accessed.
  • the S1/X2 signaling cannot be transmitted after the RN is accessed.
  • the target base station in the related art cannot reasonably determine whether the RN can access the cell under the jurisdiction of the target base station, resulting in
  • the RN has a long access delay or an access failure.
  • a cell handover method including: in a handover preparation process, a source base station determines to carry information indicating that a handover node is a relay node; and the source base station sends the bearer indication handover node to be Follow the node's information to the target base station.
  • the carrying information indicating that the handover node is a relay node includes at least one of the following: an identifier of the relay node; a type of the relay node; a cause value dedicated to the relay node handover; and an indication of the radio access bearer ( E-RAB) is the information of the E-RAB carrying the control information.
  • E-RAB radio access bearer
  • the identifier of the relay node includes at least one of the following: a field indicating that the handover node is a relay node or not a relay node; and selecting a carried field, indicating the handover node when carrying the field carried by the selection Is a relay node, when the field carried by the selection is not carried, indicating that the handover node is not a relay node; a cell identifier (ECGI) of a cell managed by the relay node; and a relay node dedicated to the source base station Interface X2 connection identifier.
  • the type of the relay node includes one of the following: an inband relay, an outband relay; a fixed relay, a mobile relay; a type 1 relay, Type la relay, type lb relay, type 2 relay; need backhaul link (Un) subframe configuration relay, no Un subframe configuration relay required.
  • the cause value of the relay node switching dedicated includes: the switching node is a relay node.
  • the information indicating that the radio access bearer (E-RAB) is the E-RAB carrying the control information includes one of the following: a field corresponding to the E-RAB identifier E-RAB ID, indicating the The E-RAB corresponding to the E-RAB ID is the E-RAB carrying the control information or the non-bearing control information; the field carried by the E-RAB ID corresponding to the E-RAB ID is selected to carry the E-RAB ID.
  • the corresponding E-RAB is an E-RAB carrying control information, and does not carry an E-RAB indicating that the E-RAB corresponding to the E-RAB ID is not carrying control information.
  • the control information includes at least one of the following: S1 signaling, X2 signaling, operation, management, maintenance (OAM) data.
  • the source base station sends information indicating that the handover node is a relay node to the target base station, and includes: when the source base station performs S1 handover with the target base station, the source base station passes the handover request message (HANDOVER) REQUIRED) sending the information indicating that the handover node is a relay node to a mobility management entity (MME), and the MME sends and receives a handover request message (HANDOVER REQUEST) And indicating that the handover node is a relay node to the target base station; when the source base station performs X2 handover with the target base station, the source base station sends, by using a handover request message, that the handover node is a relay node.
  • HANDOVER mobility management entity
  • a cell handover method including: receiving, by a target base station, information indicating that a handover node is a relay node, and transmitting, by the source base station, the handover node is a relay according to the carrying indication The information of the node determines whether the handover node is allowed to switch to the cell under the jurisdiction of the target base station.
  • the target base station determines, according to the information indicating that the handover node is a relay node, whether to allow the handover node to switch to the cell under the target base station, including: if the target base station does not allow the medium
  • the target base station sends information carrying the cause value specific to the relay node to the source base station.
  • the relay node dedicated cause value includes at least one of the following: the target base station does not allow the relay node to access; the target base station does not allow a specific type of relay node to access; The base station cannot establish an E-RAB that carries S1/X2 signaling.
  • a cell handover method including: in a handover preparation process, a source base station determines to carry information indicating that a handover node is a relay node, and sends the information to a target base station; And carrying information indicating that the handover node is a relay node, and determining, according to the information that the handover indication node is a relay node, whether to allow the handover node to switch to a cell under the target base station.
  • a source base station including: a determining module, configured to: during a handover preparation process, determine to carry information indicating that the handover node is a relay node; and a sending module, configured to send the carrying indication
  • the handover node is the information of the relay node to the target base station.
  • a target base station including: a receiving module, configured to receive, by a source base station, information indicating that the handover node is a relay node; and the determining module is configured to switch the node according to the carrying indication It is information of the relay node that determines whether the handover node is allowed to switch to the cell under the jurisdiction of the target base station.
  • a cell handover system including a source base station and a target base station: the source base station is configured to: during the handover preparation process, determine to carry information indicating that the handover node is a relay node and send the information to a target base station, configured to receive, by the source base station, information indicating that the handover node is a relay node, and determine, according to the information that the handover indication node is a relay node, whether to allow the handover node to switch To the cell under the jurisdiction of the target base station.
  • the source base station sends information indicating that the handover node is a relay node to the target base station, and the target base station determines, according to the information that the handover indication node is a relay node, whether to allow the handover node to switch to The cell under the jurisdiction of the target base station. That is, in the embodiment of the present invention, the target base station accurately determines whether the handover node allows handover, and solves the problem that the target base station determines the error, and the function or resource for not configuring the Un subframe for the RN is only enough to support the QoS of the partial E-RAB, so that the RN is connected.
  • FIG. 1 is a schematic diagram of a handover preparation process in X2 handover according to the related art
  • FIG. 2 is a schematic diagram of a handover preparation procedure in S1 handover according to the related art
  • FIG. 3 is a diagram using a wireless relay technology according to the related art.
  • FIG. 4 is a flowchart of a first cell handover method according to an embodiment of the present invention
  • FIG. 5 is a flowchart of a second cell handover method according to an embodiment of the present invention
  • FIG. 6 is a flowchart according to an embodiment of the present invention.
  • FIG. 7 is a flow chart of a preferred embodiment 1 according to an embodiment of the present invention
  • FIG. 8 is a flowchart of a preferred embodiment 2 according to an embodiment of the present invention
  • FIG. 10 is a schematic structural diagram of a target base station according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of a cell switching system according to an embodiment of the present invention.
  • the target base station when a relay node moves, it is not enough for the target base station to implement access control based only on QoS parameters. For example, for the Type 1 Relay, if the target base station does not have the function of configuring the Un subframe for the RN, even if the target base station has sufficient resources, the RN cannot be normally operated after being accessed. As another example, if the target base station The resources can only support the QoS of some E-RABs, and cannot support the QoS of E-RABs carrying S1/X2 signaling. Therefore, the S1/X2 signaling cannot be transmitted after the RN is accessed.
  • Step S402 In a handover preparation process, the source base station determines that the bearer indication handover node is a relay node.
  • the source base station determines to carry information indicating that the handover node is a relay node, and the source base station sends information carrying the indication that the handover node is a relay node to the target base station.
  • the source base station notifies the target base station RN whether it can work normally, and notifies that the adopted information is information carrying the indication that the handover node is a relay node, and solves the problem that if the target base station does not configure the Un subframe for the RN, then even if the target The base station has sufficient resources to make the RN access to work normally. If the resources of the target base station can only support the QoS of some E-RABs and cannot support the QoS of the E-RAB carrying the S1/X2 signaling, then the RN accesses. After that, the problem that the S1/X2 signaling cannot work normally cannot be transmitted, and the utilization of resources owned by the target base station is improved.
  • the information indicating that the handover node is a relay node may select different carriers according to different situations. For example, information of at least one of the following may be selected to carry information indicating that the handover node is a relay node: an identifier of the relay node; The type of the node; the cause value dedicated to the relay node handover; the information indicating that the radio access bearer E-RAB is the E-RAB carrying the control information. In an actual application, other information may also be selected as a carrier that carries the indication that the handover node is a relay node, and can carry the indication that the handover node is a relay node.
  • the information indicating that the handover node is a relay node mentioned above is taken as an example.
  • the identifier of the relay node is selected as a carrier carrying the indication that the handover node is a relay node, and the relay is considered accordingly.
  • the identifier of the node itself, the identifier of the relay node may include at least one of the following: a field indicating that the handover node is a relay node or not a relay node; Selecting the carried field, when carrying the field to be carried, indicating that the handover node is a relay node, when not carrying the field to be carried, indicating that the handover node is not a relay node; the cell identifier of the cell under the relay node is ECGI; the source base station
  • the assigned relay node-specific interface X2 connection identifies the X2AP ID.
  • the type of the relay node is selected as a carrier that indicates that the handover node is a relay node
  • the type of the relay node may include at least one of the following: Inband) trunk, outband trunk; fixed trunk, mobile trunk; type 1 (Type l) trunk, type la (Type la) trunk, type lb (Type lb ) Relay, Type 2 (Type 2) trunk; Requires backhaul link (Un) Subframe configuration relay, no Un subframe configuration relay required.
  • the reason value of the relay node switching is selected as the carrier that indicates that the switching node is a relay node, and the reason value of the relay node switching dedicated value is taken into consideration, and the cause value of the relay node switching dedicated may be Including:
  • the switching node is a relay node.
  • the information indicating that the radio access bearer E-RAB is the E-RAB carrying the control information is selected as the carrier that indicates that the handover node is the relay node, and accordingly, the E-RAB is used to indicate that the E-RAB is the bearer control.
  • the information of the information of the E-RAB of the information itself, indicating that the E-RAB is the E-RAB carrying the control information may include: a field corresponding to the E-RAB identifier E-RAB ID, indicating the E-RAB ID
  • the E-RAB is the E-RAB carrying the control information or the non-bearing control information; the field carried by the E-RAB ID corresponding to the E-RAB ID is carried, and if the E-RAB corresponding to the E-RAB ID is carried, the bearer control is carried.
  • the E-RAB of the information does not carry the E-RAB indicating that the E-RAB corresponding to the E-RAB ID is not carrying the control information.
  • the control information carried by the E-RAB may include at least one of the following: S1 signaling, X2 signaling, Operation, Administration, and Maintenance (OAM) data.
  • S1 signaling X2 signaling
  • OAM Operation, Administration, and Maintenance
  • the source base station sends information indicating that the handover node is a relay node to the target base station, and the interface between the source base station and the target base station is different, which may result in different handover modes, and the sending method is not The same, including: when the S1 handover is performed between the source base station and the target base station (the control signaling involved in this case should be S1 signaling), the source base station sends a bearer indicating that the handover node is a relay node by using a handover request message (HANDOVER REQUEST).
  • HANDOVER REQUEST a handover request message
  • the information is sent to the MME, and the MME sends, by using a handover request message (HANDOVER REQUIRED), information carrying the indication that the handover node is a relay node to the target base station; and performing X2 handover between the source base station and the target base station (the control information involved at this time should be X2 signaling) And, the source base station sends, by using the handover request message, information carrying the indication that the handover node is a relay node to the target base station.
  • the embodiment of the present invention further provides another cell handover method, where the processing procedure is as shown in FIG.
  • Step S502 The target base station receives, by the source base station, information indicating that the handover node is a relay node
  • Step S504 The target base station determines, according to the information indicating that the handover node is a relay node, whether to allow the handover node to switch to the cell under the jurisdiction of the target base station. After the target base station determines, if the target base station does not allow the relay node to switch to the cell under the jurisdiction of the target base station, the target base station sends information carrying the cause value specific to the relay node to the source base station.
  • the cause value specific to the relay node includes at least one of the following: the target base station does not allow the relay node to access; the target base station does not allow the specific type of relay node to access; the target base station cannot establish the E that carries the S1/X2 signaling -RAB.
  • the present invention further provides another cell handover method, and the processing flow thereof is as shown in FIG. 6.
  • the process includes: Step S602: In the handover preparation process, the source base station determines to carry information indicating that the handover node is a relay node.
  • Step S604 The target base station receives, by the source base station, information indicating that the handover node is a relay node, and determines, according to the information that the handover indication node is a relay node, whether to allow the handover node to switch to the cell under the target base station.
  • the source base station sends information indicating that the handover node is a relay node to the target base station, and the target base station determines whether to allow the handover node to be a relay node according to the information indicating that the handover node is a relay node.
  • the handover node switches to the cell under the jurisdiction of the target base station.
  • the target base station accurately determines whether the handover node allows handover, and solves the problem that the target base station determines the error, and the function or resource for not configuring the Un subframe for the RN is only enough to support the QoS of the partial E-RAB, so that the RN is connected.
  • the problem that the target base station cannot be used normally can improve the utilization of resources of the target base station.
  • the target base station cannot determine whether the handover node is a normal UE or a relay node, and thus may be an inappropriate resource allocated to the relay node, resulting in a long delay of access of the relay node or an access failure.
  • the method provided by the embodiment of the present invention can know in advance that the information indicating that the handover node is a relay node, avoids the situation that the target base station cannot determine, and can allocate suitable resources to the relay node to improve resource utilization.
  • the relay node in the case of allowing the relay node to access, the relay node can also be quickly and successfully accessed to the cell under the jurisdiction of the target base station.
  • Step S701 The source base station sends a handover request (HANDOVER REQUEST) message to the target base station, where the information indicating that the handover node is a relay node (RN) is carried.
  • the information indicating that the handover node is the RN refers to at least one of the following: an identifier of the RN; a field indicating that the handover node is a relay node or not a relay node; and optionally carrying a field, if carrying, indicating that the handover node is a relay node, If not carried, the switching node is not a relay node;
  • ECGI cell identifier
  • X2AP ID dedicated to the RN allocated by the source base station.
  • Type of RN including one of the following: inband trunk, outband trunk; fixed trunk, mobile trunk; type 1 (Type l) trunk, type la (Type la) trunk, type lb (Type lb) trunk, type 2 (Type 2) trunk; Un subframe configuration relay is required, and Un subframe configuration relay is not required.
  • the RN-specific switching cause includes: "The switching node is a relay node.”
  • the information indicating that the E-RAB is the E-RAB carrying the control information includes: a field corresponding to the E-RAB ID (E-RAB ID), indicating that the E-RAB corresponding to the E-RAB ID is the bearer control information.
  • Step S702 After receiving the handover request, the target base station performs access control according to the QoS parameter included in the handover request and information indicating that the handover node is a relay node.
  • the target base station allows the handover node to access, then go to step S703; otherwise, if the target base station does not allow the handover node to access, then go to step S704.
  • the information indicating that the handover node is the relay node in step S701 is the identifier of the RN or the handover reason dedicated to the RN, and the target base station knows that the handover node is a relay node according to the identifier of the RN carried in the handover request message, if the target base station does not allow Relay node access (eg, based on load balancing considerations), the target base station does not allow handover node access regardless of whether the resource is allowed or not.
  • the target base station allows the relay node to access, the target base station allows the handover node to access if resources permit.
  • the information that the handover node is the relay node is the type of the RN, and the target base station knows that the handover node is a relay node according to the type of the RN carried in the handover request message, if the target base station does not support certain types.
  • the RN type is a type that the target base station does not support, and the target base station does not allow handover node access. If the RN type carried in the handover request message is of a type supported by the target base station, and the resource allows, the target base station allows the handover node to access.
  • the relevant parameters of the E-RAB1 include RN-specific indication information, and the target base station knows that the E-RAB1 is the E-RAB carrying the control information according to the RN-specific indication information; the relevant parameters of the E-RAB2 are not included.
  • Step S703 The target base station sends a handover request acknowledgement message to the source base station, where the allocated resource information is included.
  • the target base station configures a dedicated random access resource for the handover node (ie, the relay node) (such as a dedicated random access preamble preambled step S704, and the target base station sends a handover preparation failure to the source base station (HANDOVER PREPARATION).
  • a dedicated random access resource for the handover node ie, the relay node
  • the target base station sends a handover preparation failure to the source base station (HANDOVER PREPARATION).
  • the handover preparation failure message carries an RN-specific cause value, indicating that the reason for the handover node (ie, the relay node) is not allowed to be accessed, and the cause value includes at least one of the following: the target base station does not allow the relay node to access; The target base station does not allow access by a specific type of relay node; the target base station cannot establish an E-RAB that carries S1/X2 signaling.
  • Embodiment 2 This embodiment describes a scenario of S1 handover. For the processing procedure, refer to FIG. 8.
  • Step S801 The source base station sends a handover request (HANDOVER REQUIRED) message to the MME, where the information indicating that the handover node is a relay node (RN) is carried.
  • the information indicating that the handover node is the RN refers to at least one of the following: an identifier of the RN; a field indicating that the handover node is a relay node or not a relay node; and optionally carrying a field, if carrying, indicating that the handover node is a relay node; If not carrying, the handover node is not a relay node; the cell identity (ECGI) of the cell under the relay node; and the RN-specific X2 connection identifier (X2AP ID) allocated by the source base station.
  • ECGI cell identity
  • X2AP ID RN-specific X2 connection identifier
  • Type of RN including one of the following: inband trunk, outband trunk; fixed trunk, mobile trunk; type 1 (Type l) trunk, type la (Type la) trunk, type lb (Type lb) trunk, type 2 (Type 2) trunk; Un subframe configuration relay is required, and Un subframe configuration relay is not required.
  • the RN-specific switching cause includes: "The switching node is a relay node.”
  • the information indicating that the E-RAB is the E-RAB carrying the control information includes: a field corresponding to the E-RAB ID (E-RAB ID), indicating that the E-RAB corresponding to the E-RAB ID is the bearer control information.
  • Step S802 The MME receives the handover request message and sends a corresponding handover request (HANDOVER)
  • the handover request message carries information indicating that the handover node is a relay node.
  • a container such as Source to Target Transparent Container
  • the MME since the MME does not parse the information in the container, the MME simply forwards the information in the container directly to the information.
  • Target base station After receiving the handover request, the target base station performs access control according to the QoS parameter included in the handover request and information indicating that the handover node is a relay node.
  • the target base station allows the handover node to access, go to step S804; otherwise, if the target base station does not allow the handover node to access, go to step S805.
  • the information indicating that the handover node is the relay node in step S801 is the identifier of the RN or the handover reason dedicated to the RN, and the target base station knows that the handover node is a relay node according to the identifier of the RN carried in the handover request message, if the target base station does not allow Relay node access (eg, based on load balancing considerations), the target base station does not allow handover node access regardless of whether the resource is allowed or not.
  • the target base station allows the relay node to access, the target base station allows the handover node to access if resources permit.
  • the information that the handover node is the relay node is the type of the RN, and the target base station knows that the handover node is a relay node according to the type of the RN carried in the handover request message, if the target base station does not support some types of relay nodes.
  • the target base station If the target base station does not have the function of configuring the Un-subframe, and therefore cannot support the Type 1 trunk access, and cannot support the relay node access that requires the configuration of the Un-subframe), if the RN type carried in the handover request message is If the target base station does not support the type, the target base station does not allow the handover node to access. If the RN type carried in the handover request message is of a type supported by the target base station, and the resource allows, the target base station allows the handover node to access.
  • the relevant parameters of the E-RAB1 include RN-specific indication information.
  • the target base station knows that the E-RAB 1 is the E-RAB carrying the control information according to the indication information specific to the RN.
  • the relevant parameters of the E-RAB2 are not Including RN-specific indication information, the target base station thus knows that E-RAB2 is an E-RAB that does not carry control information.
  • Step S804 The target base station sends a handover request acknowledgement (HANDOVER REQUEST ACKNOWLEDGE) message to the MME, including the allocated resource information. Further, the MME sends a handover command (HANDOVER COMMAND) message to the source base station, and forwards the resource information to the source base station.
  • HANDOVER REQUEST ACKNOWLEDGE handover request acknowledgement
  • MME sends a handover command (HANDOVER COMMAND) message to the source base station, and forwards the resource information to the source base station.
  • the target base station configures a dedicated random access resource for the handover node (ie, the relay node) (such as a dedicated random access preamble preambled if the dedicated random access resource is through the container (eg, Target ⁇ ,, r Transparent Container), then the MME simply forwards the information in the container to the source base station because the MME does not parse the information in the container.
  • a handover failure HANDOVER FAILURE
  • the MME sends a handover preparation failure (HANDOVER PREPARATION FAILURE) message to the source base station, indicating that the target base station does not allow handover node access.
  • the handover failure message and the handover preparation failure message carry an RN-specific cause value, indicating that the reason for the handover node (ie, the relay node) is not allowed to be accessed, and the cause value includes at least one of the following: the target base station does not allow the relay Node access; the target base station does not allow access by a specific type of relay node; the target base station cannot establish an E-RAB that carries S1/X2 signaling.
  • an embodiment of the present invention further provides a source base station.
  • the structure of the source base station is as shown in FIG. 9 , and includes a connection determining module 901 and a sending module 902.
  • the determining module 901 is configured to determine during the handover preparation process. Carrying information indicating that the handover node is a relay node; the sending module 902 is configured to send information carrying the indication that the handover node is a relay node to the target base station.
  • an embodiment of the present invention further provides a target base station, and a schematic structural diagram thereof is shown in FIG. 10, including a connected receiving module 1001 and a determining module 1002.
  • the receiving module 1001 is configured to receive a carrying indication sent by the source base station.
  • the handover node is information of the relay node.
  • the determination module 1002 is configured to determine, according to the information indicating that the handover node is a relay node, whether to allow the handover node to switch to the cell under the jurisdiction of the target base station.
  • an embodiment of the present invention further provides a cell handover system, and a schematic structural diagram thereof is shown in FIG. 11, including a connected source base station 1101 and a target base station 1102: a source base station 1101, which is set to be in a handover preparation process.
  • the target base station 1102 is configured to receive information indicating that the handover node is a relay node sent by the source base station 1101, and determine whether to allow the handover node to switch to the cell under the target base station 1102 according to the information indicating that the handover node is a relay node.
  • the present invention achieves the following technical effects:
  • the source base station sends information carrying the indication that the handover node is a relay node to the target base station, and the target base station Determining whether to allow the handover node to switch to the cell under the jurisdiction of the target base station according to the information indicating that the handover node is a relay node.
  • the target base station accurately determines whether the handover node allows handover, and solves the problem that the target base station determines the error, and the function or resource for not configuring the Un subframe for the RN is only enough to support the QoS of the partial E-RAB, so that the RN is connected.
  • the problem that the target base station cannot be used normally can improve the utilization of resources of the target base station.
  • the computing device 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 and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • 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.

Abstract

本发明公开了多种小区切换方法、设备及系统，第一种小区切换方法包括：在切换准备过程中，源基站确定携带指示切换节点是中继节点的信息；源基站发送携带指示切换节点是中继节点的信息至目标基站。采用本发明能够使得目标基站能够合理地判断是否允许中继节点接入目标基站所辖的小区，提高资源的利用率。

Description

小区切换方法、 设备及系统 技术领域 本发明涉及通信领域， 具体而言， 涉及小区切换方法、 设备及系统。 背景技术 在移动通信系统中， 为了满足移动性要求， 当用户设备 （UE， User Equipment) 在服务小区即源小区与网络建立连接之后，UE仍然需要对其服务小区和相邻小区的信 号质量进行测量， 以便选择更为合适的小区进行切换。 在切换过程中， 目标小区需要 对该 UE实施接入控制， 在资源允许的情况下， 允许该 UE的切换请求， 具体的切换 流程如图 1所示， 此处以演进全球陆地无线接入网络 （EUTRAN, Evolved Universal Terrestrial Radio Access Network) 为例， 图 1的切换流程包括以下步骤： 步骤 101， 在服务小区即源小区处于连接状态的 UE依据测量配置执行测量， 当 UE测得满足上报条件的相邻小区时， UE向源小区所属的源基站上报测量报告。 此处，测量报告是指相邻小区的信号质量高于服务小区的预定偏移量的测量报告、 或相邻小区的信号质量高于预定门限的测量报告。 步骤 102， 源小区所属的源基站收到测量报告后， 做出切换决策， 需要将 UE切换 到相邻基站即目标基站所在的目标小区， 源基站向目标基站发送切换请求消息。 此处，源基站和目标基站之间存在 X2接口。在切换请求消息中包含 UE建立的无 线接入承载 （E-RAB, E-UTRAN Radio Access Bearer) 的服务质量 （QoS， Quality of Service) 参数。 步骤 103， 目标基站收到切换请求消息后， 依据切换请求消息中包含的 QoS参数 执行接入控制， 在资源允许的情况下， 允许该 UE的切换， 为该 UE分配资源。 步骤 104， 目标基站向源基站发送切换请求确认消息， 包含分配的资源信息。 步骤 105， 源基站收到切换请求确认消息后， 向 UE发送切换命令。 此处， 在现有的长期演进系统 （LTE， Long Term Evolution), 源基站通过无线资 源控制 （RRC， Radio Resource Control ) 连接重配置消息携带移动控制信息 (mobilityControlInfo) 向 UE发送切换命令。 步骤 106， UE取得与目标小区的同步， 在目标小区发起随机接入， 向目标基站发 送切换完成信令， 至此， UE切换到目标小区。 其中步骤 102 104称为切换准备过程。 在上述切换流程的步骤 103中， 目标基站依据 UE建立的 E-RAB的 QoS参数实 施接入控制， 其中 QoS参数包括 QoS类别标识 （QCI， QoS Class Identifier ) 分配和 保留优先级 （ARP， Allocation and Retention Priority) 0 如果 UE建立的 E-RAB是保证 比特速率 （GBR， Guaranteed Bit Rate) 业务， 则 QoS参数还需包括上行的 GBR和下 行的 GBR、 以及上行和下行的最大比特速率 （MBR， Maximum Bit Rate), 该最大比 特速率可以大于或等于该 GBR。 其中， GBR还可以称为保证比特率； MBR还可以称 为最大比特率。 如果源基站与目标基站之间不存在 X2接口， 那么还需要通过核心网网元 （如移 动性管理实体， Mobility Management Entity, 简称为 MME)转发切换准备过程中的相 关信令， 处理流程如图 2所示： 步骤 201， 在服务小区即源小区处于连接状态的 UE依据测量配置执行测量， 当 UE测得满足上报条件的相邻小区时， UE向源小区所属的源基站上报测量报告。 步骤 202， 源小区所属的源基站收到测量报告后， 做出切换决策， 需要将 UE切换 到相邻基站即目标基站所在的目标小区， 但是由于源基站与目标基站间不存在 X2接 口， 所以源基站向 MME发送切换请求消息， 在切换请求消息中包含 UE建立的无线 接入承载（E-RAB，E-UTRAN Radio Access Bearer)的服务质量（QoS， Quality of Service) 参数。 步骤 203， MME将切换请求消息转发至目标基站。 步骤 204， 目标基站收到切换请求消息后， 依据切换请求消息中包含的 QoS参数 执行接入控制， 在资源允许的情况下， 允许该 UE的切换， 为该 UE分配资源。 步骤 205， 目标基站向 MME发送切换请求确认消息， 包含分配的资源信息。 步骤 206， MME将切换请求确认消息转发到源基站。 步骤 207， 源基站收到切换请求确认消息后， 向 UE发送切换命令消息。 步骤 208， UE取得与目标小区的同步， 在目标小区发起随机接入， 向目标基站发 送切换完成信令， 至此， UE切换到目标小区。 其中步骤 202 206称为切换准备过程。 为了满足日益增长的大带宽高速移动接入的需求， 第三代伙伴组织计划 （Third Generation Partnership Projects, 简称 3GPP) 推出高级长期演进 (Long-Term Evolution Advance, 简称 LTE-Advanced)标准。 LTE-Advanced对于 LTE系统的演进保留了 LTE 的核心， 并在此基础上采用一系列技术对频域、 空域进行了扩充， 以达到提高频谱利 用率、 增加系统容量等目的。 无线中继 （Wireless Relay) 技术即 LTE-Advanced中的技术之一， 旨在扩展小区 的覆盖范围、 减少通信中的死角地区、 平衡负载、 转移热点地区的业务和节省 UE的 发射功率。 如图 3所示， RN (Relay Node, 中继节点） 对接入其小区的用户终端 UE 提供与普通基站 eNB类似的功能和服务，两者间的无线接口称为 "接入链路" ( Access Link),也称为 Uu接口。 RN通过无线接口以类似于普通 UE的方式接入一个服务于它 的 e B， 服务于 RN的 eNB称之为施主基站（Donor eNB, 简称 DeNB)。 RN与 De B 间的无线接口称为 "回传链路"（Backhaul Link), 也称为 Un口。 根据 RN在 Un口与 Uu口使用的中心频率是否相同，可将 RN分为"带内" (Inband) 禾 P "带外"（Outband) 两种工作模式。 Inband Relay指的是 RN在 Un口禾 P Uu口使用 相同的频率， Outband Relay是指 RN在 Un口和 Uu口使用不同的频率。 对于 Inband Relay, 根据其是拥有自己的独立小区， 还是作为 DeNB下小区的一 部分， 分别定义了第一种类型的中继 Typel Relay和第二种类型的中继 Type2 Relay。 Typel Relay是指 RN能够创建属于自己的独立小区， 这些小区拥有自己的物理小区标 识 (Physical Cell ID， 简称 PCI)， RN在自己的小区内像基站一样工作， 如发送参考信 号， 对 UE进行调度等； 而 Type2 Relay没有自己独立的小区和 PCI， 只是辅助 DeNB 进行数据传输。除了 Type 1 Relay以夕卜，标准中还定义了" Type la"禾口" Type lb"Relay。 它们与 Type 1 Relay类似， 都有独立的小区和 PCI， 也独立进行控制信号的收发和调 度。 当中继节点移动时， 目标基站仅仅根据 QoS参数实施接入控制是不够的。 例如对 于 Type l Relay, 如果目标基站没有为 RN配置 Un子帧的功能， 那么即使目标基站有 足够的资源也无法使得 RN接入后正常工作。 再如， 如果目标基站的资源仅能支持部 分 E-RAB的 QoS， 不能支持承载 S1/X2信令的 E-RAB的 QoS， 那么 RN接入后无法 传递 S1/X2信令无法正常工作。 针对相关技术中目标基站不能合理判断 RN能否接入目标基站管辖的小区， 导致
RN接入延时长或者接入失败的问题， 目前尚未提出有效的解决方案。 发明内容 本发明提出了小区切换方法、 设备及系统， 使得目标基站能够合理地判断是否允 许中继节点接入目标基站所辖的小区， 提高资源的利用率。 根据本发明的一个方面， 提供了一种小区切换方法， 包括： 在切换准备过程中， 源基站确定携带指示切换节点是中继节点的信息； 所述源基站发送所述携带指示切换 节点是中继节点的信息至目标基站。 优选的， 所述携带指示切换节点是中继节点的信息包括下列至少之一： 中继节点 的标识； 中继节点的类型； 中继节点切换专用的原因值； 用于指示无线接入承载 (E-RAB) 是承载控制信息的 E-RAB的信息。 优选的， 所述中继节点的标识包括下列至少之一： 表示切换节点是中继节点或者 不是中继节点的字段； 选择携带的字段， 当携带所述选择携带的字段时表示所述切换 节点是中继节点， 当不携带所述选择携带的字段时表示所述切换节点不是中继节点； 中继节点所辖的小区的小区标识（ECGI); 所述源基站分配的中继节点专用的接口 X2 连接标识。 优选的，所述中继节点的类型包括下列之一：带内（inband)中继、带外（outband) 中继； 固定 （fixed) 中继、 移动 （mobile) 中继； 类型 1中继、 类型 la中继、 类型 lb 中继、 类型 2中继； 需要回传链路 （Un) 子帧配置中继、 不需要 Un子帧配置中继。 优选的， 所述中继节点切换专用的原因值包括： 切换节点是中继节点。 优选的， 所述用于指示无线接入承载（E-RAB )是承载控制信息的 E-RAB的信息 包括下列之一： 与 E-RAB标识 E-RAB ID——对应的字段， 表示所述 E-RAB ID对应 的 E-RAB是承载控制信息的 E-RAB或者不承载控制信息； 与 E-RAB标识 E-RAB ID 一一对应的选择携带的字段，若携带表示所述 E-RAB ID对应的 E-RAB是承载控制信 息的 E-RAB，若不携带表示所述 E-RAB ID对应的 E-RAB是不承载控制信息的 E-RAB。 优选的， 所述控制信息包括下列至少之一： S1信令、 X2信令、 运行、 管理、 维 护 （OAM) 数据。 优选的，所述源基站发送携带指示切换节点是中继节点的信息至目标基站，包括: 当所述源基站与所述目标基站间进行 S1 切换时， 所述源基站通过切换要求消息 (HANDOVER REQUIRED) 发送所述携带指示切换节点是中继节点的信息至移动性 管理实体 （MME)， 所述 MME通过切换请求消息 （HANDOVER REQUEST) 发送携 带指示切换节点是中继节点的信息至所述目标基站； 当所述源基站与所述目标基站间 进行 X2切换时， 所述源基站通过切换请求消息发送携带指示切换节点是中继节点的 信息至所述目标基站。 根据本发明的另一个方面， 提供了一种小区切换方法， 包括： 目标基站接收源基 站发送的携带指示切换节点是中继节点的信息； 所述目标基站根据所述携带指示切换 节点是中继节点的信息判断是否允许所述切换节点切换至所述目标基站所辖的小区。 优选的， 所述目标基站根据所述携带指示切换节点是中继节点的信息判断是否允 许所述切换节点切换至所述目标基站所辖的小区， 包括： 若所述目标基站不允许所述 中继节点切换至所述目标基站所辖的小区时， 所述目标基站发送携带中继节点专用的 原因值的信息至所述源基站。 优选的， 所述中继节点专用的原因值包括下列至少之一： 所述目标基站不允许所 述中继节点接入； 所述目标基站不允许特定类型的中继节点接入； 所述目标基站无法 建立承载 S1/X2信令的 E-RAB。 根据本发明的另一个方面， 提供了一种小区切换方法， 包括： 在切换准备过程中， 源基站确定携带指示切换节点是中继节点的信息并发送至目标基站； 所述目标基站接 收所述源基站发送的携带指示切换节点是中继节点的信息， 并根据所述携带指示切换 节点是中继节点的信息判断是否允许所述切换节点切换至所述目标基站所辖的小区。 根据本发明的另一个方面， 提供了一种源基站， 包括： 确定模块， 设置为在切换 准备过程中， 确定携带指示切换节点是中继节点的信息； 发送模块， 设置为发送所述 携带指示切换节点是中继节点的信息至目标基站。 根据本发明的另一个方面， 提供了一种目标基站， 包括： 接收模块， 设置为接收 源基站发送的携带指示切换节点是中继节点的信息； 判断模块， 设置为根据所述携带 指示切换节点是中继节点的信息判断是否允许所述切换节点切换至所述目标基站所辖 的小区。 根据本发明的另一个方面， 提供了一种小区切换系统， 包括源基站和目标基站： 所述源基站， 设置为在切换准备过程中， 确定携带指示切换节点是中继节点的信息并 发送至目标基站； 所述目标基站， 设置为接收所述源基站发送的携带指示切换节点是 中继节点的信息， 并根据所述携带指示切换节点是中继节点的信息判断是否允许所述 切换节点切换至所述目标基站所辖的小区。 在本发明实施例中， 在切换准备过程中， 源基站发送携带指示切换节点是中继节 点的信息至目标基站， 目标基站根据携带指示切换节点是中继节点的信息判断是否允 许切换节点切换至目标基站所辖的小区。 即， 在本发明实施例中， 目标基站准确判断 切换节点是否允许切换， 解决了目标基站判断错误， 没有为 RN配置 Un子帧的功能 或资源仅够支持部分 E-RAB的 QoS， 使得 RN接入后无法正常工作的问题， 提高目标 基站的资源的利用率。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部分， 本发 明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的不当限定。 在附图 中： 图 1是根据相关技术的 X2切换中的切换准备过程示意图； 图 2是根据相关技术的 S1切换中的切换准备过程示意图； 图 3是根据相关技术的利用无线中继技术的网络结构示意图； 图 4是根据本发明实施例的第一种小区切换方法的流程图； 图 5是根据本发明实施例的第二种小区切换方法的流程图； 图 6是根据本发明实施例的第三种小区切换方法的流程图； 图 7是根据本发明实施例的优选实施例一的流程图； 图 8是根据本发明实施例的优选实施例二的流程图； 图 9是根据本发明实施例的源基站的结构示意图； 图 10是根据本发明实施例的目标基站的结构示意图； 图 11是根据本发明实施例的小区切换系统的结构示意图。 具体实施方式 相关技术中提到， 当中继节点移动时， 目标基站仅仅根据 QoS参数实施接入控制 是不够的。 例如对于 Type 1 Relay, 如果目标基站没有为 RN配置 Un子帧的功能， 那 么即使目标基站有足够的资源也无法使得 RN接入后正常工作。 再如， 如果目标基站 的资源仅能支持部分 E-RAB的 QoS， 不能支持承载 S1/X2信令的 E-RAB的 QoS， 那 么 RN接入后无法传递 S1/X2信令无法正常工作。 为解决上述技术问题， 本发明实施例提供了一种小区切换方法， 其处理流程如图 4所示， 包括： 步骤 S402、在切换准备过程中，源基站确定携带指示切换节点是中继节点的信息; 步骤 S404、 源基站发送携带指示切换节点是中继节点的信息至目标基站。 在本发明实施例中， 在切换准备过程中， 源基站确定携带指示切换节点是中继节 点的信息， 源基站发送携带指示切换节点是中继节点的信息至目标基站。 即， 源基站 提前通知目标基站 RN能否正常工作， 通知所采用的信息即为携带指示切换节点是中 继节点的信息， 解决了如果目标基站没有为 RN配置 Un子帧的功能， 那么即使目标 基站有足够的资源也无法使得 RN接入后正常工作或者， 如果目标基站的资源仅能支 持部分 E-RAB的 QoS， 不能支持承载 S1/X2信令的 E-RAB的 QoS， 那么 RN接入后 无法传递 S1/X2信令无法正常工作等问题， 提高目标基站拥有的资源的利用率。 实施时，携带指示切换节点是中继节点的信息可以根据不同情况选择不同的载体， 例如， 可以选择下列至少之一的信息携带指示切换节点是中继节点的信息： 中继节点的标识； 中继节点的类型； 中继节点切换专用的原因值； 用于指示无线接入承载 E-RAB是承载控制信息的 E-RAB的信息。 实际应用中， 还可能选择其他的信息作为携带指示切换节点是中继节点的载体， 能够携带指示切换节点是中继节点即可。 现以上述提到的几种携带指示切换节点是中继节点的信息为例进行说明， 例如， 选择中继节点的标识作为携带指示切换节点是中继节点的载体， 则相应的考虑到中继 节点的标识自身的特性， 中继节点的标识可以包括下列至少之一： 表示切换节点是中继节点或者不是中继节点的字段； 选择携带的字段， 当携带选择携带的字段时表示切换节点是中继节点， 当不携带 选择携带的字段时表示切换节点不是中继节点； 中继节点所辖的小区的小区标识 ECGI; 源基站分配的中继节点专用的接口 X2连接标识 X2AP ID。 再例如， 选择中继节点的类型作为携带指示切换节点是中继节点的载体， 则相应 的考虑到中继节点的类型自身的特性， 中继节点的类型可以包括下列至少之一： 带内 （inband) 中继、 带外 （outband) 中继； 固定 （fixed) 中继、 移动 （mobile) 中继； 类型 1 (Type l ) 中继、 类型 la (Type la) 中继、 类型 lb (Type lb) 中继、 类型 2 (Type 2) 中继； 需要回传链路 （Un) 子帧配置中继、 不需要 Un子帧配置中继。 再例如， 选择中继节点切换专用的原因值作为携带指示切换节点是中继节点的载 体， 则相应的考虑到中继节点切换专用的原因值自身的特性， 中继节点切换专用的原 因值可以包括： 切换节点是中继节点。 再例如， 选择用于指示无线接入承载 E-RAB是承载控制信息的 E-RAB的信息作 为携带指示切换节点是中继节点的载体，则相应的考虑到用于指示 E-RAB是承载控制 信息的 E-RAB的信息自身的特性，指示 E-RAB是承载控制信息的 E-RAB的信息可以 包括： 与 E-RAB标识 E-RAB ID——对应的字段， 表示 E-RAB ID对应的 E-RAB是承 载控制信息的 E-RAB或者不承载控制信息； 与 E-RAB标识 E-RAB ID一一对应的选择携带的字段， 若携带表示 E-RAB ID对 应的 E-RAB是承载控制信息的 E-RAB, 若不携带表示 E-RAB ID对应的 E-RAB是不 承载控制信息的 E-RAB。 实施时， E-RAB承载的控制信息可以包括下列至少之一： S1信令、 X2信令、 运 行、 管理、 维护 （OAM， Operations, Administration and Maintenance) 数据。 如图 4所示流程，步骤 S404在实施时，源基站发送携带指示切换节点是中继节点 的信息至目标基站， 源基站与目标基站间接口不同， 会导致不同的切换方式， 发送方 法也不相同， 包括： 当源基站与目标基站间进行 S1切换 （此时涉及的控制信令应为 S1信令） 时， 源 基站通过切换请求消息（HANDOVER REQUEST)发送携带指示切换节点是中继节点 的信息至 MME， MME通过切换要求消息 （HANDOVER REQUIRED) 发送携带指示 切换节点是中继节点的信息至目标基站； 当源基站与目标基站间进行 X2切换 （此时涉及的控制信息应为 X2信令） 时，， 源基站通过切换请求消息发送携带指示切换节点是中继节点的信息至目标基站。 基于同一发明构思， 本发明实施例还提供了另外一种小区切换方法， 其处理流程 如图 5所示， 包括： 步骤 S502、 目标基站接收源基站发送的携带指示切换节点是中继节点的信息； 步骤 S504、 目标基站根据携带指示切换节点是中继节点的信息判断是否允许切换 节点切换至目标基站所辖的小区。 目标基站进行判断后，若目标基站不允许中继节点切换至目标基站所辖的小区时， 目标基站发送携带中继节点专用的原因值的信息至源基站。 其中， 中继节点专用的原因值包括下列至少之一： 目标基站不允许中继节点接入； 目标基站不允许特定类型的中继节点接入； 目标基站无法建立承载 S1/X2信令的 E-RAB。 基于同一发明构思， 本发明还提供了另外一种小区切换方法， 其处理流程如图 6 所示， 包括： 步骤 S602、 在切换准备过程中， 源基站确定携带指示切换节点是中继节点的信息 并发送至目标基站； 步骤 S604、 目标基站接收源基站发送的携带指示切换节点是中继节点的信息， 并 根据携带指示切换节点是中继节点的信息判断是否允许切换节点切换至目标基站所辖 的小区。 综上可知， 在本发明实施例中， 在切换准备过程中， 源基站发送携带指示切换节 点是中继节点的信息至目标基站， 目标基站根据携带指示切换节点是中继节点的信息 判断是否允许切换节点切换至目标基站所辖的小区。 即， 在本发明实施例中， 目标基 站准确判断切换节点是否允许切换， 解决了目标基站判断错误， 没有为 RN配置 Un 子帧的功能或资源仅够支持部分 E-RAB的 QoS，使得 RN接入后无法正常工作的问题， 提高目标基站的资源的利用率。 此外， 在相关技术中， 目标基站无法判断切换节点是普通 UE还是中继节点， 因 此可能为中继节点分配的不合适的资源， 导致中继节点接入延时长或者接入失败， 采 用本发明实施例提供的方法， 可以提前获知携带指示切换节点是中继节点的信息， 避 免出现目标基站无法判断的情况， 能够为中继节点分配合适的资源， 提高资源的利用 率。 此外， 在允许中继节点接入的情况下， 还能使得中继节点快速成功地接入目标基 站所辖的小区。 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在不冲突的 情况下， 本申请中的实施例及实施例中的特征可以相互组合。 实施例一 本实施例描述的是 X2切换的场景， 处理流程如图 7所示。 步骤 S701 : 源基站发送切换请求 （HANDOVER REQUEST) 消息给目标基站， 其中携带指示切换节点是中继节点 （RN) 的信息。 指示切换节点是 RN的信息指的是以下至少之一： RN的标识； 表示切换节点是中继节点或者不是中继节点的字段； 可选携带的字段， 若携带表示切换节点是中继节点， 若不携带表示切换节点不是 中继节点； 中继节点所辖小区的小区标识 （ECGI); 源基站分配的 RN专用的 X2连接标识 （ X2AP ID )。
RN的类型， 包括以下之一： 带内 （inband) 中继、 带外 （outband) 中继； 固定 （fixed) 中继、 移动 （mobile) 中继； 类型 1 (Type l ) 中继、 类型 la (Type la) 中继、 类型 lb (Type lb) 中继、 类型 2 (Type 2) 中继； 需要 Un子帧配置中继、 不需要 Un子帧配置中继。
RN专用的切换原因 （Cause), 包括： "切换节点是中继节点"。 用于指示 E-RAB是承载控制信息的 E-RAB的信息， 包括： 与 E-RAB标识 (E-RAB ID) ——对应的字段， 表示 E-RAB ID对应的 E-RAB是 承载控制信息的 E-RAB或者不承载控制信息的 E-RAB的字段； 与 E-RAB标识（E-RAB ID)—一对应的可选携带的字段， 若携带表示 E-RAB ID 对应的 E-RAB是承载控制信息的 E-RAB; 若不携带表示 E-RAB ID对应的 E-RAB是 不承载控制信息的 E-RAB。 进一步地， 控制信息包括以下至少之一： S1信令、 X2信令、 0AM数据。 步骤 S702: 目标基站收到切换请求后，依据切换请求中包含的 QoS参数以及指示 切换节点是中继节点的信息执行接入控制。 若目标基站允许该切换节点接入， 则进入 步骤 S703 ; 否则， 若目标基站不允许切换节点接入， 则进入步骤 S704。 例如，步骤 S701中指示切换节点是中继节点的信息是 RN的标识或者 RN专用的 切换原因， 目标基站根据切换请求消息中携带 RN的标识已知切换节点是中继节点， 若目标基站不允许中继节点接入（如基于负载均衡的考虑）， 则无论资源是否允许， 目 标基站不允许切换节点接入。若目标基站允许中继节点接入， 则在资源允许的情况下， 目标基站允许切换节点接入。 例如， 步骤 S701中切换节点是中继节点的信息是 RN的类型， 目标基站根据切换 请求消息中携带 RN的类型已知切换节点是中继节点， 如果目标基站不支持某些类型 的中继节点接入 （如目标基站没有配置 Un子帧的功能， 因此无法支持 Type 1中继接 入， 无法支持需要 Un子帧配置的中继节点接入）， 则若切换请求消息中携带的 RN类 型是目标基站不支持的类型， 则目标基站不允许切换节点接入。 若切换请求消息中携 带的 RN类型是目标基站支持的类型， 并且在资源允许的情况下， 目标基站允许切换 节点接入。 例如， 步骤 S701中指示切换节点是中继节点的信息是用于指示 E-RAB是承载控 制信息的 E-RAB 的信息， 如切换请求消息中指示有两个 E-RAB 待建立： E-RAB 1 (E-RAB ID=1 ) 禾 P E-RAB 2 (E-RAB ID=2)。 其中， E-RABl的相关参数中包括 RN 专用的指示信息 （indicator), 目标基站根据 RN专用的指示信息已知 E-RABl是承载 控制信息的 E-RAB; E-RAB2的相关参数中不包括 RN专用的指示信息 （indicator), 目标基站从而已知 E-RAB2是不承载控制信息的 E-RAB。 那么， 如果目标基站无法建 立 E-RAB1 (即使可以建立 E-RAB2), 就意味着目标基站无法运行 RN的切换。 否则 RN所辖小区的 UE将无法正常工作。 步骤 S703 , 目标基站向源基站发送切换请求确认消息， 包含分配的资源信息。 可选的， 目标基站为切换节点 （即中继节点） 配置专用的随机接入资源 （如专用 的随机接入前导码 preambled 步骤 S704， 目标基站向源基站发送切换准备失败 （HANDOVER PREPARATION
FAILURE) 消息， 指示目标基站不允许切换节点接入。 可选的， 切换准备失败消息中携带 RN专用的原因值， 指示不允许切换节点 （即 中继节点） 接入的原因， 原因值包括以下至少之一： 目标基站不允许中继节点接入； 目标基站不允许特定类型的中继节点接入； 目标基站无法建立承载 S1/X2信令的 E-RAB。 实施例二 本实施例描述的是 S1切换的场景， 其处理流程请参见图 8。 步骤 S801 : 源基站发送切换要求 （HANDOVER REQUIRED) 消息给 MME， 其 中携带指示切换节点是中继节点 （RN) 的信息。 指示切换节点是 RN的信息指的是以下至少之一： RN的标识； 表示切换节点是中继节点或者不是中继节点的字段； 可选携带的字段， 若携带表示切换节点是中继节点； 若不携带表示切换节点不是 中继节点； 中继节点所辖小区的小区标识 （ECGI); 源基站分配的 RN专用的 X2连接标识 （ X2AP ID )。
RN的类型， 包括以下之一： 带内 （inband) 中继、 带外 （outband) 中继； 固定 （fixed) 中继、 移动 （mobile) 中继； 类型 1 (Type l ) 中继、 类型 la (Type la) 中继、 类型 lb (Type lb) 中继、 类型 2 (Type 2) 中继； 需要 Un子帧配置中继、 不需要 Un子帧配置中继。
RN专用的切换原因 （Cause), 包括： "切换节点是中继节点"。 用于指示 E-RAB是承载控制信息的 E-RAB的信息， 包括： 与 E-RAB标识 (E-RAB ID) ——对应的字段， 表示 E-RAB ID对应的 E-RAB是 承载控制信息的 E-RAB或者不承载控制信息的 E-RAB的字段； 与 E-RAB标识（E-RAB ID)—一对应的可选携带的字段， 若携带表示 E-RAB ID 对应的 E-RAB是承载控制信息的 E-RAB; 若不携带表示 E-RAB ID对应的 E-RAB是 不承载控制信息的 E-RAB。 进一步地， 控制信息包括以下至少之一： S1信令、 X2信令、 0AM数据。 步骤 S802 : MME 收到切换要求消息， 发送相应的切换请求 （HANDOVER
REQUEST) 消息给目标基站。 切换请求消息中携带指示切换节点是中继节点的信息。 在此过程中， 若指示切换节点是中继节点的信息是通过容器 （如 Source to Target Transparent Container) 传递的， 那么由于 MME不解析容器内的信息， 因此 MME只 是将容器内的信息直接转发给目标基站。 步骤 S803 : 目标基站收到切换请求后，依据切换请求中包含的 QoS参数以及指示 切换节点是中继节点的信息执行接入控制。 若目标基站允许该切换节点接入， 则进入 步骤 S804; 否则， 若目标基站不允许切换节点接入， 则进入步骤 S805。 例如，步骤 S801中指示切换节点是中继节点的信息是 RN的标识或者 RN专用的 切换原因， 目标基站根据切换请求消息中携带 RN的标识已知切换节点是中继节点， 若目标基站不允许中继节点接入（如基于负载均衡的考虑）， 则无论资源是否允许， 目 标基站不允许切换节点接入。若目标基站允许中继节点接入， 则在资源允许的情况下， 目标基站允许切换节点接入。 例如， 步骤 S801中切换节点是中继节点的信息是 RN的类型， 目标基站根据切换 请求消息中携带 RN的类型已知切换节点是中继节点， 如果目标基站不支持某些类型 的中继节点接入 （如目标基站没有配置 Un子帧的功能， 因此无法支持 Type 1中继接 入， 无法支持需要 Un子帧配置的中继节点接入）， 则若切换请求消息中携带的 RN类 型是目标基站不支持的类型， 则目标基站不允许切换节点接入。 若切换请求消息中携 带的 RN类型是目标基站支持的类型， 并且在资源允许的情况下， 目标基站允许切换 节点接入。 例如， 步骤 S801中指示切换节点是中继节点的信息是用于指示 E-RAB是承载控 制信息的 E-RAB 的信息， 如切换请求消息中指示有两个 E-RAB 待建立： E-RAB 1 (E-RAB ID=1 ) 禾 P E-RAB 2 (E-RAB ID=2)。 其中， E-RAB1的相关参数中包括 RN 专用的指示信息 （indicator), 目标基站根据 RN专用的指示信息已知 E-RAB 1是承载 控制信息的 E-RAB; E-RAB2的相关参数中不包括 RN专用的指示信息 （indicator), 目标基站从而已知 E-RAB2是不承载控制信息的 E-RAB。 那么， 如果目标基站无法建 立 E-RAB1 (即使可以建立 E-RAB2), 就意味着目标基站无法运行 RN的切换。 否则 RN所辖小区的 UE将无法正常工作。 步骤 S804 : 目标基站向 MME 发送切换请求确认 （HANDOVER REQUEST ACKNOWLEDGE ) 消息， 包含分配的资源信息。 进一步地， MME 发送切换命令 (HANDOVER COMMAND) 消息给源基站， 将资源信息转发给源基站。 可选的， 目标基站为切换节点 （即中继节点） 配置专用的随机接入资源 （如专用 的随机接入前导码 preambled 若专用的随机接入资源是通过容器（如 Target ^，，r Transparent Container) 传递的， 那么由于 MME不解析容器内的信息， 因此 MME只 是将容器内的信息直接转发给源基站。 步骤 S805: 目标基站向 MME发送切换失败 （HANDOVER FAILURE) 消息， 指 示目标基站不允许切换节点接入。 进一步地， MME发送切换准备失败 （HANDOVER PREPARATION FAILURE) 消息给源基站， 指示目标基站不允许切换节点接入。 可选的， 切换失败消息和切换准备失败消息中携带 RN专用的原因值， 指示不允 许切换节点 （即中继节点） 接入的原因， 原因值包括以下至少之一： 目标基站不允许中继节点接入； 目标基站不允许特定类型的中继节点接入； 目标基站无法建立承载 S1/X2信令的 E-RAB。
基于同一发明构思， 本发明实施例还提供了一种源基站， 其结构示意图如图 9所 示， 包括相连的确定模块 901和发送模块 902: 确定模块 901， 设置为在切换准备过程中， 确定携带指示切换节点是中继节点的 信息； 发送模块 902， 设置为发送携带指示切换节点是中继节点的信息至目标基站。 基于同一发明构思， 本发明实施例还提供了一种目标基站， 其结构示意图如图 10 所示， 包括相连的接收模块 1001和判断模块 1002: 接收模块 1001， 设置为接收源基站发送的携带指示切换节点是中继节点的信息； 判断模块 1002， 设置为根据携带指示切换节点是中继节点的信息判断是否允许切 换节点切换至目标基站所辖的小区。 基于同一发明构思， 本发明实施例还提供了一种小区切换系统， 其结构示意图如 图 11所示， 包括相连的源基站 1101和目标基站 1102: 源基站 1101， 设置为在切换准备过程中， 确定携带指示切换节点是中继节点的信 息并发送至目标基站 1102; 目标基站 1102， 设置为接收源基站 1101发送的携带指示切换节点是中继节点的 信息， 并根据携带指示切换节点是中继节点的信息判断是否允许切换节点切换至目标 基站 1102所辖的小区。 从以上的描述中， 可以看出， 本发明实现了如下技术效果： 在本发明实施例中， 在切换准备过程中， 源基站发送携带指示切换节点是中继节 点的信息至目标基站， 目标基站根据携带指示切换节点是中继节点的信息判断是否允 许切换节点切换至目标基站所辖的小区。 即， 在本发明实施例中， 目标基站准确判断 切换节点是否允许切换， 解决了目标基站判断错误， 没有为 RN配置 Un子帧的功能 或资源仅够支持部分 E-RAB的 QoS， 使得 RN接入后无法正常工作的问题， 提高目标 基站的资源的利用率。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布在多个计算装置所 组成的网络上， 可选地， 它们可以用计算装置可执行的程序代码来实现， 从而， 可以 将它们存储在存储装置中由计算装置来执行， 并且在某些情况下， 可以以不同于此处 的顺序执行所示出或描述的步骤， 或者将它们分别制作成各个集成电路模块， 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样， 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域的技 术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内， 所作的 任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种小区切换方法， 包括：
在切换准备过程中， 源基站确定携带指示切换节点是中继节点的信息； 所述源基站发送所述携带指示切换节点是中继节点的信息至目标基站。
2. 根据权利要求 1所述的方法， 其中， 所述携带指示切换节点是中继节点的信息 包括下列至少之一：
中继节点的标识；
中继节点的类型；
中继节点切换专用的原因值；
用于指示无线接入承载 E-RAB是承载控制信息的 E-RAB的信息。
3. 根据权利要求 2所述的方法， 其中， 所述中继节点的标识包括下列至少之一： 表示切换节点是中继节点或者不是中继节点的字段；
选择携带的字段， 当携带所述选择携带的字段时表示所述切换节点是中继 节点， 当不携带所述选择携带的字段时表示所述切换节点不是中继节点； 中继节点所辖的小区的小区标识 ECGI;
所述源基站分配的中继节点专用的接口 X2连接标识。
4. 根据权利要求 2所述的方法， 其中， 所述中继节点的类型包括下列之一： 带内 inband中继、 带外 outband中继；
固定 fixed中继、 移动 mobile中继；
类型 1中继、 类型 la中继、 类型 lb中继、 类型 2中继；
需要回传链路 Un子帧配置中继、 不需要 Un子帧配置中继。
5. 根据权利要求 2所述的方法， 其中， 所述中继节点切换专用的原因值包括： 切 换节点是中继节点。
6. 根据权利要求 2所述的方法，其中，所述用于指示无线接入承载 E-RAB是承载 控制信息的 E-RAB的信息包括下列之一： 与 E-RAB标识 E-RAB ID——对应的字段， 表示所述 E-RAB ID对应的 E-RAB是承载控制信息的 E-RAB或者不承载控制信息；
与 E-RAB标识 E-RAB ID一一对应的选择携带的字段， 若携带表示所述 E-RAB ID对应的 E-RAB是承载控制信息的 E-RAB，若不携带表示所述 E-RAB ID对应的 E-RAB是不承载控制信息的 E-RAB。
7. 根据权利要求 1至 6任一项所述的方法， 其中， 所述控制信息包括下列至少之 一： S1信令、 X2信令、 运行、 管理、 维护 OAM数据。
8. 根据权利要求 7所述的方法， 其中， 所述源基站发送携带指示切换节点是中继 节点的信息至目标基站， 包括：
当所述源基站与所述目标基站间进行 S1 切换时， 所述源基站通过切换要 求消息 HANDOVER REQUIRED发送所述携带指示切换节点是中继节点的信 息至移动性管理实体 MME， 所述 MME 通过切换请求消息 HANDOVER REQUEST发送携带指示切换节点是中继节点的信息至所述目标基站；
当所述源基站与所述目标基站间进行 X2切换时， 所述源基站通过切换请 求消息发送携带指示切换节点是中继节点的信息至所述目标基站。
9. 一种小区切换方法， 包括： 目标基站接收源基站发送的携带指示切换节点是中继节点的信息； 所述目标基站根据所述携带指示切换节点是中继节点的信息判断是否允许 所述切换节点切换至所述目标基站所辖的小区。
10. 根据权利要求 9所述的方法， 其中， 所述目标基站根据所述携带指示切换节点 是中继节点的信息判断是否允许所述切换节点切换至所述目标基站所辖的小 区， 包括： 若所述目标基站不允许所述中继节点切换至所述目标基站所辖的小 区时， 所述目标基站发送携带中继节点专用的原因值的信息至所述源基站。
11. 根据权利要求 10所述的方法，其中，所述中继节点专用的原因值包括下列至少 之一：
所述目标基站不允许所述中继节点接入；
所述目标基站不允许特定类型的中继节点接入；
所述目标基站无法建立承载 S1/X2信令的无线接入承载 E-RAB。
12. 一种小区切换方法， 包括：
在切换准备过程中， 源基站确定携带指示切换节点是中继节点的信息并发 送至目标基站；
所述目标基站接收所述源基站发送的携带指示切换节点是中继节点的信 息， 并根据所述携带指示切换节点是中继节点的信息判断是否允许所述切换节 点切换至所述目标基站所辖的小区。
13. 一种源基站， 包括：
确定模块， 设置为在切换准备过程中， 确定携带指示切换节点是中继节点 的信息；
发送模块， 设置为发送所述携带指示切换节点是中继节点的信息至目标基 站。
14. 一种目标基站， 包括：
接收模块，设置为接收源基站发送的携带指示切换节点是中继节点的信息; 判断模块， 设置为根据所述携带指示切换节点是中继节点的信息判断是否 允许所述切换节点切换至所述目标基站所辖的小区。
15. 一种小区切换系统， 包括源基站和目标基站：
所述源基站， 设置为在切换准备过程中， 确定携带指示切换节点是中继节 点的信息并发送至目标基站；
所述目标基站， 设置为接收所述源基站发送的携带指示切换节点是中继节 点的信息， 并根据所述携带指示切换节点是中继节点的信息判断是否允许所述 切换节点切换至所述目标基站所辖的小区。
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