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WO2011113324A1 - 一种处理回程链路错误的方法和中继节点 - Google Patents

一种处理回程链路错误的方法和中继节点 Download PDF

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Publication number
WO2011113324A1
WO2011113324A1 PCT/CN2011/071493 CN2011071493W WO2011113324A1 WO 2011113324 A1 WO2011113324 A1 WO 2011113324A1 CN 2011071493 W CN2011071493 W CN 2011071493W WO 2011113324 A1 WO2011113324 A1 WO 2011113324A1
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WIPO (PCT)
Prior art keywords
relay node
base station
configuration
backhaul link
integrity protection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
PCT/CN2011/071493
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English (en)
French (fr)
Inventor
邓云
王冠宙
韩立锋
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ZTE Corp
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ZTE Corp
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Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Publication of WO2011113324A1 publication Critical patent/WO2011113324A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • 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 mobile communications, and in particular, to a processing method when a backhaul link between a base station and a relay node is erroneous, and a relay node that handles the error.
  • LTE-Advanced Long-Term Evolution advance
  • LTE-Advanced Long-Term Evolution advance
  • UE User Equipment
  • a new relay node (Relay-Node, RN for short) is added between the original base station (eNB), the donor base station (Door-eNB) and the UE. These new RNs and Donor- The eNB performs a radio resource control connection.
  • the radio link between the Donor-eNB and the RN is called a backhaul link, and the radio link between the RN and the UE is called an access link.
  • the downlink data arrives at the Donor-eNB first, and then passes to the RN, which then transmits to the UE, and vice versa.
  • an RN dedicated channel is defined: a Relay-node Physical Downlink Control CHannel (R-PDCCH), and a RN Physical Downlink Shared CHannel (R). -PDSCH) and RN Physical Uplink Shared CHannel (R-PUSCH).
  • R-PDCCH resource may be a partial Orthogonal Frequency Division Multiplexing (OFDM) symbol or all OFDM symbols in a subframe for downlink transmission of the backhaul link.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the base station utilizes the R-PDCCH dynamically or semi-statically
  • the R-PDSCH resource and the R-PUSCH resource are allocated to the relay node, where the R-PDSCH resource is used for transmitting downlink data of the backhaul link, and the R-PUSCH resource is used for transmitting uplink data of the backhaul link.
  • the RN when in the UE connection state, can monitor the downlink assignment (ie, PDSCH resource) indicated by the base station on the Physical Downlink Control Channel (PDCCH) and the uplink grant (ie, the Physical Uplink Control Channel). , referred to as PUCCH and/or Physical Uplink Shared Channel (PUSCH) resources, and implement relay nodes and base stations on the corresponding Physical Downlink Shared Channel (PDSCH) and PUSCH. Data transfer between.
  • the RN when the relay function is enabled in the connection state
  • the relay node indicates the downlink assignment and the uplink grant on the PDCCH of the access link, and implements transmission between the relay node and the user equipment on the corresponding PDSCH and PUSCH, thereby avoiding the relay node and the base station.
  • the transmission between the relay node and the user equipment conflicts with the user equipment.
  • the relay node may be in one of the following states: Idle state: The RN is in an idle state upon initial power-on, and is also in an idle state after the radio link reestablishment fails. When the RN is in an idle state, it has the same or all of the same functions as the UE in the idle state, such as acquiring system information function, measurement function, and cell selection/reselection function.
  • connection state of the UE When the RN is in the connection state of the UE, it has the same or all of the same functions as the UE in the connected state, such as acquiring system information function, measurement function, reporting function, handover function, and between the base station and the RN. A data transmission function or the like is performed through a control channel (PDCCH) and a shared channel (PDSCH or PUSCH).
  • the RN that is in the connection state of the UE does not have the relay function, that is, the user equipment cannot access the network through the local RN.
  • the relay function enables the connection state:
  • the RN has a relay function in this state, that is, the RN has a relay function between the RN and the base station (Donor-eNB), and data transmission between the RN and the UE it manages.
  • the relay function includes: acquiring a system information function, measuring and reporting a measurement report function, a handover function, and using a dedicated control channel (R-PDCCH) and a shared channel (R-PDSCH or R- PUSCH) The function of data transmission, etc.
  • R-PDCCH dedicated control channel
  • R-PDSCH shared channel
  • the relay function When the RN is in the relay function enable connection state, it can also manage the cells belonging to this RN and manage it. UE in this cell. Between the RN and the UE, the relay function includes transmitting the system information function of the RN, managing the measurement process of the UE, managing the handover process of the UE, and passing the control channel (PDCCH) and the shared channel (PDSCH/PUSCH) between the RN and the UE. ) The function of data transmission, etc.
  • the above state name and corresponding definitions only clarify the attributes that the relay node has at different stages. In other documents, the status names may be different, for example, the initial power-on state and the working state, where the initial power-on state includes the idle state described above. And the connection status as the UE.
  • the RN may complete the transition from the idle state to the connection state as the UE through the Radio Resource Control (RRC) connection establishment process, and may also complete the transition from the connection state to the idle state as the UE through the RRC connection release process. Conversion.
  • the access process of the relay node status includes the following:
  • the cell search is performed, the cell under the Donor eNB is selected, and the system message is read, and the relay node is in an idle state. Since the primary purpose of a relay node is to provide service to user equipment within its coverage, the time during which the relay node is idle may be short.
  • the relay node selects a random access prefix according to the random access resource in the system message, initiates a random access, establishes an RRC connection (that is, establishes a Signaling Radio Bearer (SRB)), and then It is authenticated and encrypted by the core network.
  • RRC connection that is, establishes a Signaling Radio Bearer (SRB)
  • the Donor eNB configures a Data Radio Bearer (DRB) for data transmission for the relay node through an RRC connection RRC Connection Reconfiguration.
  • DRB Data Radio Bearer
  • the relay node is in the connection state as the UE, and the relay node needs to monitor the PDCCH delivered by the Donor eNB according to the wireless network allocated by the Donor eNB.
  • the Radio Network Temporary Identifier may include a Cell Radio Network Temporary Identifier (C-RNTI) and a Semi-Persistent Scheduling Radio Network Temporary Identifier (SPS).
  • the relay node can notify the Donor eNB by carrying information in the air interface signaling, and the access node is the relay node instead of the common user equipment, and the Donor eNB can also learn the relay node through the core network.
  • the information obtained by the relay node is obtained, or the information accessed by the relay node is obtained through the operation and maintenance (O&M) server.
  • O&M operation and maintenance
  • the O&M server sends configuration data to the relay node, so that the relay node can implement the relay function to provide services for the user equipment covering the coverage.
  • the downloaded configuration data includes parameter information of the relay node configuring its own system information, such as a Tracking Area Code (TAC), a cell identity (Cell Identity), and a cell selection/reselection parameter, and may also include a relay.
  • TAC Tracking Area Code
  • Cell Identity Cell Identity
  • a relay may also include a relay.
  • the configuration parameters required for the node to be in the relay function enable connection state, such as R-PDCCH configuration information, R-PDSCH configuration information, R-PUSCH configuration information, configuration information of a relay node-specific scheduling request (Scheduling Request), and scheduling
  • the subframe information of the node also referred to as a Fake Multicast Broadcast Single Frequency Network (Fake MBSFN) subframe
  • the relay node After obtaining the configuration information, the relay node initializes the necessary parameters, so as to prepare for providing the cell service by the relay function, the relay node needs to initialize related counters and state variables, and properly configure the system information of the provided cell. When the access link and the backhaul link share the same frequency band, the relay node needs to
  • the Donor-eNB keeps the connection (uplink and downlink in the backhaul link) and on the other hand needs to keep connected with the user equipment (uplink and downlink in the access link), which may cause conflicts handled by the relay node, in order to solve In this problem, the setting of the Fake MBSFN subframe is further introduced in the downlink subframe of the backhaul link.
  • the relay node In the Fake MBSFN subframe, the relay node only receives the signal of the Donor-eNB, and does not send a signal to the user equipment in the access link.
  • the Donor-eNB schedules the relay node with the R-PDCCH.
  • the relay node accesses the Donor-eNB as an ordinary user equipment, and after the network side obtains the identity of the relay node by authenticating, the Donor-eNB adopts the R-PDCCH mode in a specific time slot.
  • the relay node is scheduled, but the Donor-eNB still manages the relay node as if it were a normal user equipment.
  • the relay node needs to comply with the specifications of the ordinary user equipment in the backhaul link.
  • the relay node works normally, it provides services for multiple user devices covering its range, and these user devices are in a connected state or an idle state.
  • the relay node triggers the RRC connection re-establishment process (including cell selection, reading the target cell system message, initiating random access, reconfiguring the SRB, and reconfiguring). DRB), make relay The node cannot properly maintain the connection with its lower user equipment for a long period of time, which may cause communication interruption, which is very unfavorable to the user experience.
  • the technical problem to be solved by the present invention is to provide a method and a relay node for processing a backhaul link error, which avoids communication interruption of user equipment within the coverage of the relay node due to a problem of the backhaul link.
  • the present invention provides a method for processing a backhaul link error, the method comprising: after the relay node determines that a radio link error occurs with a backhaul link between the base stations, continuing to maintain the wireless with the base station Resource control connection.
  • the relay node maintains a radio resource control connection with the base station: the relay node does not trigger a radio resource control connection reestablishment procedure.
  • the wireless link error includes any one of the following errors:
  • the relay node cannot comply with all or part of configuration information sent by the base station, integrity protection failure, random access problem in the backhaul link, and relay
  • the Radio Link Control (RLC) layer of the node reaches the maximum number of retransmissions and the physical layer problem of the backhaul link.
  • RLC Radio Link Control
  • the step of continuing to maintain the radio resource control connection with the base station includes: after the relay node receives the configuration or reconfiguration information of the base station, If it is determined that the relay node cannot comply with all or part of the configuration sent by the base station, maintaining a radio resource control connection with the base station; the method further includes: the relay node notifying the base station that the current configuration occurs error. among them, The step of the relay node notifying the base station that an error occurs in the current configuration includes: the relay node does not send response signaling to the base station; and the base station determines that the response sent by the relay node is not received within a predetermined time.
  • the signaling is considered to be an error in the current configuration; or the step of the relay node notifying the base station that an error occurs in the current configuration includes: the relay node notifying the base station that the configuration fails through the air interface signaling, and The air interface signaling carries the reason for the configuration failure.
  • the base station After receiving the air interface signaling, the base station checks whether the configuration parameter has a problem. If yes, the configuration parameter is modified and then sent to the relay node. , otherwise try to send the configuration parameters again. among them,
  • the reason for the configuration failure includes one or more of the following reasons: the configured parameters are incorrect, the format of the configuration information is incorrect, the data radio bearer (DRB) in the configuration does not exist, and the signaling radio bearer in the configuration ( SRB ) does not exist, the measurement ID in the configuration does not exist, the measurement object in the configuration does not exist, and the measurement structure in the configuration does not exist. among them,
  • the step of continuing to maintain the radio resource control connection with the base station includes: after the relay node receives the data packet, according to the data packet If the integrity of the data packet sent by the base station fails to be determined, the radio resource control connection with the base station is maintained; the method further includes: the relay node notifying the base station that the integrity protection fails.
  • the step of the relay node notifying the base station that the integrity protection fails includes: the relay node sending the integrity protection failure information to the base station by using a dedicated channel of the relay node or air interface signaling on the common control channel.
  • the information includes one or more of the following parameters: the identifier information of the radio bearer, the counter (COUNT) value, and the integrity protection algorithm; or the step of the relay node notifying the base station that the integrity protection fails includes: The relay node notifies the base station integrity protection failure by using an empty integrity protection algorithm on the backhaul link.
  • the method further includes: After the base station learns that the integrity protection fails, the new reconfiguration command is returned to the relay node, where the new reconfiguration command includes configuration parameters of the reconfigured integrity protection algorithm; After the reconfiguration command, integrity protection is implemented according to the reconfigured configuration parameters. among them,
  • the step of continuing to maintain the radio resource control connection with the base station includes: the relay node determines that a random access problem occurs with the backhaul link between the base stations,
  • the radio link control (RLC) layer of the relay node continues to maintain the radio resource control connection with the base station when the radio link control (RLC) layer reaches one of the maximum number of retransmissions and the physical layer problem: the method further includes: the relay node Increase its transmit power in the backhaul link.
  • the method further includes: the base station setting a dedicated transmit power upper limit for the relay node; wherein, the relay node adjusts When the transmit power in the backhaul link is high, the dedicated transmit power upper limit is not exceeded.
  • the method further includes: after the relay node increases its transmit power in the backhaul link, notifying the base station of its state by dedicated signaling.
  • the present invention further provides a relay node that processes a backhaul link error, and the relay node includes: a judging module and a radio resource control connection re-establishment module, where: the judging module is configured to: determine and Whether the radio link error occurs in the backhaul link between the base stations; the radio resource control connection reestablishment module is configured to: when the judging module determines that a radio link error occurs between the backhaul link between the relay node and the base station, does not initiate The radio resource controls the connection re-establishment process.
  • the determining module is configured to determine whether a radio link error occurs between the backhaul link with the base station according to the following manner: after receiving the configuration or reconfiguration information of the base station, if it is determined that the relay node cannot comply with the base All or part of the configuration sent by the station determines that a radio link error occurs with the backhaul link between the base stations; or
  • the radio link control (RLC) layer of the relay node After receiving the data packet, determining, according to the content of the data packet, that the integrity protection of the data packet sent by the base station fails, determining that a radio link error occurs with the backhaul link between the base station; determining that the backhaul link with the base station occurs
  • the radio link control (RLC) layer of the relay node reaches the maximum number of retransmissions, and one of the physical layer problems, it is determined that a radio link error occurs with the backhaul link between the base stations.
  • the relay node further includes a notification module, where: the notification module is configured to: if it is determined that the relay node cannot comply with all or part of the configuration sent by the base station, notify the base station that a radio link error occurs on the backhaul link, or according to The content of the data packet determines that the integrity protection of the data packet sent by the base station fails, and the base station integrity protection is notified to fail.
  • the present invention restores the backhaul link in the shortest possible time, enhances the robustness of the backhaul link, avoids communication interruption, and improves the user experience.
  • FIG. 1 is a schematic diagram of a network structure using a wireless relay technology
  • FIG. 2 is a flowchart of determining and processing a backhaul link error according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic diagram of a backhaul link error according to Embodiment 2 of the present invention
  • Judge and process the flow chart
  • the inventive concept of the present invention is: After the relay node determines that a radio link error occurs with the backhaul link between the base stations, the relay node continues to maintain the radio resource control connection with the base station.
  • the maintaining, by the relay node, the radio resource control connection with the base station refers to: maintaining the backhaul link without triggering a radio resource control connection reestablishment procedure. Since the relay node maintains a radio resource control connection with the base station, UE communication interruption under the relay node can be avoided.
  • the radio link error includes any one of the following errors:
  • the relay node cannot comply with all or part of configuration information sent by the base station, integrity protection failure, random access problem in the backhaul link, and radio link control
  • the (Radio Link Control, RLC for short) layer reaches the maximum number of retransmissions and the physical layer of the backhaul link.
  • the relay node interacts with the base station to repair errors in the backhaul link as much as possible, ensures that the UE communication under the relay node is not interrupted, and enhances the robustness of the backhaul link.
  • the relay node that implements the foregoing method includes: a determining module and a radio resource control connection re-establishment module, where: the determining module is configured to: determine whether a radio link error occurs with a backhaul link between the base station; and the radio resource control connection reestablishment The module is configured to: when the determining module determines that a radio link error occurs in the backhaul link between the relay node and the base station, does not initiate a radio resource control connection reestablishment process.
  • the relay node further includes a notification module, where the notification module is configured to: notify the base station that a backhaul link has a radio link error after a radio link error occurs.
  • the radio link error includes any one of the following errors:
  • the relay node cannot comply with all or part of configuration information sent by the base station, integrity protection failure, random access problem in the backhaul link, and relay node
  • the RLC layer reaches the maximum number of retransmissions and the physical layer problem of the backhaul link.
  • the cell search is performed, the cell under the Donor eNB is selected, and the system message is read, and the relay node is in an idle state.
  • the relay node selects a random access prefix according to the random access resource in the system message, initiates random access, establishes an RRC connection, and then authenticates and encrypts the network side. After the authentication and encryption succeeds, the network side passes the network side.
  • RRC Connection Reconfiguration configures the relay node with a DRB for data transmission.
  • the O&M server sends configuration data to the relay node, so that the relay node can implement the relay function and provide services for the user equipment covering the coverage.
  • the configured configuration data includes one or more of the following parameters: the tracking area code (Tracking Area Code), the cell identity (Cell Identity), and the cell selection/reselection parameters.
  • the parameters may also be sent by the Donor-eNB to the relay node via air interface signaling such as RRC connection reconfiguration).
  • the relay node After obtaining the configuration information, the relay node initializes the necessary parameters to prepare for providing the cell service by the relay function.
  • the relay node needs to initialize related counters and state variables, and reasonably configure the system information of the provided cell.
  • the base station After a period of time, when the relay node completes the initialization work, the base station starts scheduling the relay node in the R-PDCCH mode, and the relay node is in the relay function enable connection state, and can provide services for the user equipment of the lower coverage area. .
  • the Donor eNB manages the relay node like a normal user equipment, including: adding, modifying, or deleting the DRB configuration for it, adding and modifying it Or delete the measurement configuration, establish or release semi-persistent scheduling (SPS) for it, and configure the Medium Access Control (MAC) layer configuration (MAC-MainConfig) for it. Configure the physical layer-specific configuration (physicalConfigDedicated), etc.
  • the Donor eNB implements this function through RRC connection reconfiguration.
  • the Donor eNB can also use other air interface signaling such as: Evolved Universal Terrestrial Radio Access Network (E-UTRAN) system switching command (MobilityFromEUTRACommand), or new signaling, Implement the described configuration.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • MobilityFromEUTRACommand MobilityFromEUTRACommand
  • Step 210 After the relay node receives the configuration or reconfiguration information of the base station, if the configuration of the base station is incorrect or due to other reasons other than the relay node , so that the relay node cannot comply with the base station transmission "all to ⁇ with" (part of the configuration), it is considered that a wireless link error occurs with the backhaul link between the base stations, The relay node maintains the current backhaul link, that is, does not trigger the RRC Connection Reestablishment; when the partial configuration sent by the base station is correct, the relay node can use the partial configuration without error. If the relay node can comply with the configuration of the base station, it is executed according to the normal flow.
  • Step 220 The relay node notifies the base station that an error occurs in the current configuration.
  • the relay node may notify the base station that the configuration configuration error occurs in one of the following ways:
  • the relay node completes the reconfiguration by not transmitting the response signaling, such as the radio resource control connection ( RRC Connection Reconfiguration Complete)
  • the signaling port is based on the error of the current state.
  • the base station is configured to receive no response within the predetermined time, the default configuration of the configuration is problematic.
  • the air interface signaling notifies the base station that the configuration fails.
  • the specific configuration may be as follows: Partial configuration succeeds, partial configuration fails, or all configuration fails.
  • the reason for the configuration failure may be carried in the air interface signaling, and the specific configuration may be caused by one or more of the following reasons:
  • the configured parameters are incorrect, the format of the configuration information is incorrect, and the DRB in the configuration is configured. It does not exist, the SRB in the configuration does not exist, the measurement identifier in the configuration does not exist, the measurement object in the configuration does not exist, and the measurement structure in the configuration does not exist.
  • the relay node may notify the base station of the configuration failure by using RRC signaling, such as radio resource control connection reconfiguration completion signaling, or new radio resource control connection reconfiguration failure signaling. At this point, the processing of the relay node portion is completed. For the base station, the base station corrects the configuration after learning that the configuration has an error.
  • the base station does not receive the response sent by the relay node within a predetermined time, or after receiving the air interface signaling that fails to be configured, checks whether there is a problem with the parameters of the current configuration. If there is a problem with the configured parameters, If it is modified, it will be resent after modification. This will avoid sending similar configuration information to the relay node in the future. If the configured parameters are correct, there may be a problem in the wireless transmission. You can try to send this part of the configuration information again. If the relay node only informs the base station that the configuration fails, the base station checks all configuration parameters. If the relay node carries the failure cause, the base station checks the part of the configuration that caused the error according to the failure reason.
  • the base station sends signaling to increase the measurement task to the relay node by using the RRC connection reconfiguration, where the measurement identifier includes the measurement object indicated by the measurement identifier and the associated measurement configuration, because the measurement task corresponds to The measurement structure is not defined (the measurement structure is not defined or defined and then deleted).
  • the relay node cannot comply with this configuration.
  • the relay node continues to maintain the radio resource control connection with the serving cell, and does not trigger the radio resource control connection reestablishment. .
  • the relay node may send the signaling of the RRC connection reconfiguration failure to the base station, or include the configuration failure information in the RRC connection reconfiguration complete signaling, and notify the base station that the reconfiguration failure of the newly added measurement task fails.
  • the base station After obtaining the failed information, the base station detects that the information included in the RRC connection reconfiguration signaling is sent to the relay node, and if there is an error, modifies the error configuration, and sends the new configuration information to the relay node again; or is no longer in the middle. The node sends the same configuration information.
  • the determining module in the relay node is further configured to: determine whether the current relay node cannot comply with all or part of the configuration sent by the base station, and if yes, the radio resource control connection re-establishment module does not Initiating a radio resource control connection re-establishment process; further, the relay node further includes a notification module, where the notification module is configured to: when the determining module determines that the relay node cannot comply with all or part of the configuration sent by the base station, The interface signaling notifies the base station that a radio link error has occurred on the backhaul link.
  • the relay node accesses the cell under the Donor eNB, and the relay function is enabled.
  • the relay node listens to the R-PDCCH in the Fake MB SFN subframe of the backhaul link, and the base station has configured a force for the relay node. Ciphering algorithm and integrity protection algorithm.
  • the relay node needs to calculate the X-MAC (ie, Computed MAC-I) of the Protocol Data Unit (PDU), if the calculated X-MAC and the received corresponding data.
  • the message authentication code for Integrity (MAC-I) in the packet is consistent, then the certificate is proved. Integrity protection is successful, otherwise it proves unsuccessful.
  • the parameters for calculating the X-MAC include the counter COUNT value, the direction parameter (DIRECTION), the radio bearer identifier (BEARER), and the key (Key is KRR Cmt or Kupmt).
  • the COUNT value is composed of a Hyper Frame Number (HFN) and a Packet Data Convergence Protocol Sequence Number (PDCP SN).
  • Step 310 After receiving the data packet, the relay node determines, according to the content of the data packet, that the data integrity protection issued by the base station fails, A radio link error occurs between the backhaul link with the base station, and the relay node maintains a radio resource control connection with the serving cell, and does not trigger the radio resource control connection reestablishment; the relay node fails to perform data integrity protection every time the data packet is received. No check. When the relay node judges that the X-MAC of the calculated data packet is consistent with the received MAC-I, the data integrity protection is considered to be successful, and if it is inconsistent, the data integrity protection is considered to be failed.
  • Step 320 The relay node notifies the base station that the backhaul link has a radio link error.
  • the radio link error refers to the integrity protection failure; the relay node passes the air interface signaling or the common control channel on the dedicated channel.
  • the new air interface signaling on the Control Channel reports to the base station the failure of integrity protection failure, such as the failure to send integrity protection.
  • the information includes one of the following integrity protection failures. Or multiple parameters: identification information of the radio bearer, COUNT value, and integrity protection algorithm. Since the uplink is no problem at this time, the relay node can transmit the information of the integrity protection failure to the base station according to the original integrity protection algorithm. At this time, the base station needs to use the same algorithm as the relay node to resolve the relay node. Signaling sent.
  • the relay node notifies the base station integrity protection failure by using a null integrity protection algorithm ('NULL' integrity protection algorithm (eiaO)) on the backhaul link, and using the empty integrity protection algorithm means that the relay node is not applied completely.
  • 'NULL' integrity protection algorithm eiaO
  • the sexual protection algorithm in particular, the relay node uses an empty integrity protection algorithm when transmitting the information of the integrity protection failure or other data, and the base station learns the integrity protection after detecting that the relay node uses the empty integrity protection algorithm. failure. At this point, the processing of the relay node portion is completed.
  • Step 330 After obtaining the integrity protection failure, the base station returns a new reconfiguration signaling to the relay node, where the configuration parameters including the reconfiguration integrity protection algorithm, such as the COUNT value and the new complete, are included. Sexual protection algorithm and the like; Preferably, in other embodiments, the base station may also indicate in the reconfiguration signaling that the relay node does not apply an integrity protection algorithm.
  • Step 340 After receiving the new reconfiguration command, the relay node implements integrity protection according to the newly configured parameters.
  • the relay node detects that the integrity protection fails, and the base station may initiate a security configuration update process to the relay node to send a new algorithm to the relay node, for example, the base station sends an intra-cell handover or a cross-cell handover to the relay node.
  • the new encryption algorithm and integrity protection algorithm are included in the handover command. If the relay node cannot configure (or comply with) the new encryption algorithm and integrity protection algorithm, the relay node still uses the original encryption algorithm and integrity protection algorithm. Maintain communication with the base station.
  • the determining module in the relay node is further configured to: determine whether the integrity protection of the data packet sent by the base station fails, and if yes, the radio resource control connection re-establishment module does not initiate radio resource control.
  • the relay node further includes a notification module, where the notification module is configured to: when the determining module determines that the integrity protection of the data packet sent by the base station fails, the dedicated channel or common control of the relay node The air interface signaling on the channel or by using an empty integrity protection algorithm informs the base station that a radio link error has occurred on the backhaul link, such as transmitting an integrity protection failure message to the base station.
  • the relay node accesses the cell under the Donor eNB, and is in the relay function enable connection state.
  • the relay node detects a random access problem in the backhaul link, that is, the MAC layer detects the maximum number of preamble transmissions in the random access procedure, or the RLC layer of the relay node reaches The problem of the maximum number of retransmissions, or the physical layer problem of the backhaul link (the relay section)
  • the physical layer indicates an error indicated to the RRC layer, for example, the PDCCH has an out-of-sync and the T310 times out, it is considered that a radio link error occurs with the backhaul link between the base station, and the relay node maintains the original cell.
  • the RRC connection does not trigger the RRC connection re-establishment, and the relay node increases its transmit power in the backhaul link, so that the base station can receive the transmit signal power of the relay node and improve the detection effect.
  • the random access problem is an error indicated by the MAC layer to the RRC layer on the relay node, and the problem that the RLC layer reaches the maximum number of retransmissions is an error indicated by the RRC layer to the RLC layer on the relay node.
  • the allowed transmit power upper limit Pmax is broadcast in the existing system message, and all user equipments and relay nodes cannot exceed this upper limit, but in order to avoid the relay node from causing communication interruption due to the problem of the backhaul link Allowing the relay node to increase the transmit power (ie, allow Pmax to be exceeded) when detecting a random access problem in the backhaul link, or a problem in which the RLC layer reaches the maximum number of retransmissions, or a physical layer problem of the backhaul link.
  • the base station sets a dedicated transmit power upper limit for the relay node, and the relay node raises its backhaul chain when it finds a random access problem, or the RLC layer reaches the maximum number of retransmission problems, or the physical layer problem of the backhaul link.
  • the transmit power in the road but not exceeding the dedicated transmit power limit. While improving the signal detection capability of the base station, the user equipment covering the coverage of other base stations will also generate interference. If the interference is serious, the base station can switch the relay node to the adjacent cell.
  • the relay node may improve its own transmit power, in some cases (for example, when the relay node detects that the power of the reference signal transmitted by the base station decreases, or when the physical layer of the backhaul link has a problem)
  • the base station is requested to improve the downlink transmission power through the air interface signaling to ensure the signal transmission quality of the relay node backhaul link, and then the base station can switch the relay node to the adjacent cell to avoid interference to other user equipments.
  • the relay node After the relay node increases the transmit power, it can notify the base station of its status through dedicated signaling, so that the base station can handle this situation in time.
  • the base station can also calculate the path loss by using the measurement report of the serving cell reported by the relay node, thereby indirectly obtaining the condition that the relay node increases the transmission power, and the base station can switch the relay node to the appropriate target cell to prevent the relay node from acting on the other node.
  • User equipment is causing serious interference.
  • the determining module in the relay node is further configured to: determine whether one of the following problems occurs in the backhaul link between the relay node and the base station: a random access problem, the relay node The RLC layer reaches the maximum number of retransmissions and the physical layer problem.
  • the relay node further includes a transmit power adjustment module, the transmit power The adjustment module is configured to: when the determining module determines that the wireless link has the above problem, increase the transmit power in the backhaul link.
  • the present invention restores the backhaul link in the shortest possible time by solving the problems occurring on the backhaul link as much as possible, enhances the robustness of the backhaul link, avoids communication interruption, and improves the user experience.

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Abstract

本发明公开了一种处理回程链路错误的方法，该方法包括：中继节点判断与基站间的回程链路发生无线链路错误后，继续维持与所述基站的无线资源控制连接。本发明还公开了一种处理回程链路错误的中继节点，该中继节点包括：判断模块和无线资源控制连接重建模块，其中：所述判断模块设置为：判断与基站间的回程链路是否发生无线链路错误；所述无线资源控制连接重建模块设置为：在所述判断模块判断本中继节点与基站间的回程链路发生无线链路错误时，不发起无线资源控制连接重建过程。本发明增强了回程链路的强壮性，提高了用户体验。

Description

一种处理回程链路错误的方法和中继节点
技术领域 本发明涉及移动通信领域， 尤其涉及基站与中继节点之间的回程链路发 生错误时的处理方法和处理该错误的中继节点。
背景技术
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。 UTE- Advanced 对于长期演进（ Long-Term Evolution , 简称 LTE ) 系统的演进保留了 LTE的 核心， 在此基础上釆用一系列技术对频域和空域进行扩充， 以达到提高频谱 利用率和增加系统容量等目的。 无线中继 （Relay )技术即是 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， 以及节省用户设备 ( User Equipment , 简称 UE ) 即终端的发射功率。 如图 1 所示， 在原有的基站 （eNB ) , 即宿主基站 ( Donor-eNB )和 UE之间增加一些新的中继节点（ Relay-Node, 简称 RN ) , 这些新增的 RN和 Donor-eNB进行无线资源控制连接。 其中， Donor-eNB和 RN之间的无线链路称为回程链路 ( backhaul link ) , RN和 UE之间的无线 链路称为接入链路（access link )。 下行数据先到达 Donor-eNB, 然后传递给 RN, RN再传输至 UE, 上行则反之。 为了配置回程链路的资源， 定义了 RN专用信道： RN物理下行控制信 道（Relay-node Physical Downlink Control CHannel, 简称 R-PDCCH ) , RN 物理下行共享信道 ( Relay-node Physical Downlink Shared CHannel , 简称 R-PDSCH ) 和 RN 物理上行共享信道（Relay-node Physical Uplink Shared CHannel, 简称 R-PUSCH ) 。 R-PDCCH资源可以是用于回程链路下行传输 的子帧中的部分正交频分复用 ( Orthogonal Frequency Division Multiplexing, 简称 OFDM )符号或全部 OFDM符号。基站利用 R-PDCCH动态或半静态地 为中继节点分配 R-PDSCH资源和 R-PUSCH资源， 其中， R-PDSCH资源用 于传输回程链路的下行数据， R-PUSCH资源用于传输回程链路的上行数据。
RN (处于作为 UE 连接状态时） 可以监听物理下行控制信道 （Physical Downlink Control Channel,简称 PDCCH )上基站指示的下行指配（即 PDSCH 资源）和上行授权 (即物理上行共享信道 ( Physical Uplink Control Channel, 简称 PUCCH )和 /或物理上行共享信道（ Physical Uplink Shared Channel, 简 称 PUSCH ) 资源）等， 并在相应的物理下行共享信道（Physical Downlink Shared Channel, 简称 PDSCH )和 PUSCH上实现中继节点与基站之间的数 据传输。 RN (处于中继功能使能连接状态时 )也可以监听 R-PDCCH上基站 指示的下行指配（即 R-PDSCH资源 )和上行授权等， 并在相应的 R-PDSCH 和 R-PUSCH上实现中继节点与基站之间的传输。 同时， 中继节点在接入链 路的 PDCCH上指示下行指配和上行授权等， 并在相应的 PDSCH和 PUSCH 上实现中继节点与用户设备之间的传输， 从而避免中继节点与基站之间的传 输和中继节点与用户设备之间的传输冲突。 中继节点可以处于以下状态中的一种： 空闲状态： RN初始上电时处于空闲状态， 无线链路重建失败后也处于 空闲状态。 RN处于空闲状态时与处于空闲状态的 UE具有全部或部分相同的 功能， 如获取系统信息功能， 测量功能和小区选择 /重选功能等。 作为 UE的连接状态： RN处于作为 UE的连接状态时与处于连接状态的 UE 具有全部或部分相同的功能， 如获取系统信息功能， 测量功能， 上报功 能， 切换功能， 以及在基站与 RN之间通过控制信道（PDCCH )及共享信道 ( PDSCH或 PUSCH )进行数据传输功能等。处于作为 UE的连接状态的 RN 不具备中继功能， 即无法使得用户设备通过本 RN接入网络。 中继功能使能连接状态： RN在此状态下具备中继功能， 即 RN具有在 RN和基站（ Donor-eNB ) 之间 , 以及在 RN和其管理的 UE之间进行数据传 输的中继功能。 具体地， 在基站与 RN之间， 中继功能包括： 获取系统信息 功能， 测量及上报测量报告功能， 切换功能， 以及通过专用控制信道 ( R-PDCCH )及共享信道（ R-PDSCH或 R-PUSCH )进行数据传输的功能等。
RN处于中继功能使能连接状态时， 还可以管理属于此 RN的小区以及管理 此小区中的 UE。在 RN与 UE之间，中继功能包括发送 RN的系统信息功能， 管理 UE的测量过程， 管理 UE的切换过程， 以及在 RN与 UE之间通过控制 信道（PDCCH )及共享信道（ PDSCH/PUSCH )进行数据传输的功能等。 上述状态名称及对应定义仅为明确中继节点在不同阶段具有的属性， 在 其他文档中状态名称可能有所不同， 例如为初始上电状态和工作状态， 其中 初始上电状态包括上述的空闲状态和作为 UE的连接状态。
RN可以通过无线资源控制 （Radio Resource Control, 简称 RRC )连接 建立过程完成从空闲状态到作为 UE的连接状态的转换，还可以通过 RRC连 接释放过程， 完成从作为 UE的连接状态转换至空闲状态的转换。 中继节点状态的接入过程包括以下内容：
( 1 ) 中继节点 （RN )初始上电后， 实施小区搜索， 选择 Donor eNB下 的小区， 读取其系统消息， 此时中继节点处于空闲状态。 由于中继节点的主要目的是为其覆盖范围内的用户设备提供服务， 因此 中继节点处于空闲状态的时间可能很短。 ( 2 )该中继节点根据系统消息中的随机接入资源选择随机接入前缀，发 起随机接入， 建立 RRC连接（也就是建立了信令无线承载（ Signaling Radio Bearer, 简称 SRB ) ) , 然后由核心网对其进行鉴权和加密。 在鉴权和加密 成功后 , Donor eNB通过 RRC连接重西己置 ( RRC Connection Reconfiguration ) 为该中继节点配置用于数据传输的数据无线承载（Data Radio Bearer, 简称 DRB ) 。 在该过程中， 一旦中继节点发起的随机接入成功， 该中继节点就处 于作为 UE的连接状态， 该中继节点需要监视 Donor eNB下发的 PDCCH , 根据 Donor eNB为其分配的无线网络临时标识 （Radio Network Temporary Identifier, 简称 RNTI, 可以包括小区无线网络临时标识（ Cell Radio Network Temporary Identifier , 简称 C-RNTI ) 和半静态调度无线网络临时标识 ( Semi-Persistent Scheduling Radio Network Temporary Identifier, 简称 SPS RNTI )等 )检测出属于自己的 PDCCH和 /或位于同一子帧的 PDSCH。 中继 节点可以通过在空中接口信令中携带信息通知 Donor eNB , 此次接入的是中 继节点而非普通用户设备， Donor eNB也可以通过核心网对该中继节点的鉴 权获得中继节点接入的信息， 或者还可以通过后台操作和维护 （Operation & Maintenance, 简称 0&M )服务器获知中继节点接入的信息。
( 3 )在中继节点建立了 DRB之后， 0&M服务器向该中继节点发送配 置数据， 以便中继节点能够实现中继功能， 为其覆盖范围的用户设备提供服 务。 下载的配置数据包括中继节点配置自身系统信息的参数信息如跟踪区域 码（ Tracking Area Code, 简称 TAC ) 、 小区的标识（ Cell Identity ) 、 以及小 区选择 /重选的参数 ,还可能包括中继节点处于中继功能使能连接状态所需的 配置参数如 R-PDCCH配置信息、 R-PDSCH配置信息、 R-PUSCH配置信息、 中继节点专用的调度请求（ Scheduling Request ) 的配置信息、 调度中继节点 的子帧信息（或者称为伪多播广播单频网络（ Fake Multicast Broadcast Single Frequency Network, 简称 Fake MBSFN )子帧） 、 以及中继节点特定的标识 等。 中继节点获得这些配置信息后， 初始化必须的参数， 从而为能够以中继 功能提供小区服务做准备， 中继节点需要初始化相关的计数器和状态变量， 以及合理配置所提供小区的系统信息等。 当接入链路与回程链路共享同一个频段， 中继节点一方面需要与
Donor-eNB保持连接（回程链路中的上行和下行） ， 另一方面又需要与用户 设备保持连接（接入链路中的上行和下行） ， 这可能导致中继节点处理的冲 突， 为了解决这个问题， 特引入回程链路下行子帧配置 Fake MBSFN子帧的 设置， 在 Fake MBSFN子帧， 中继节点只接收 Donor-eNB的信号 , 不向接入 链路中的用户设备发送信号。在 Fake MBSFN子帧， Donor-eNB以 R-PDCCH 调度中继节点。 在回程链路中， 中继节点是以普通用户设备的身份接入 Donor-eNB, 网 络侧通过鉴权后获知中继节点的身份后， Donor-eNB 在特定的时隙以 R-PDCCH的方式调度中继节点， 但 Donor-eNB仍然像管理普通的用户设备 一样管理该中继节点，中继节点在回程链路中需要遵守普通用户设备的规范。 当中继节点正常工作时， 为其覆盖范围的多个用户设备提供服务， 这些用户 设备处于连接状态或空闲状态。 然而当回程链路发生错误时， 按照现有协议 规范， 中继节点会触发无线资源控制连接重建流程（包括小区选择， 读取目 标小区系统消息， 发起随机接入， 重配置 SRB, 以及重配置 DRB ) , 使中继 节点在较长的一段时间不能正常的保持与其下用户设备的连接， 很可能导致 通信的中断， 这对用户体验是很不利的。
发明内容 本发明要解决的技术问题是提供一种处理回程链路错误的方法和中继节 点， 避免因为回程链路的问题导致中继节点覆盖范围内的用户设备出现通信 中断。 为解决上述技术问题， 本发明提供了一种处理回程链路错误的方法， 该 方法包括： 中继节点判断与基站间的回程链路发生无线链路错误后， 继续维持与所 述基站的无线资源控制连接。 其中， 所述中继节点维持与所述基站的无线资源控制连接是： 所述中继节点不 触发无线资源控制连接重建流程。 其中， 所述无线链路错误包括以下错误中的任一种： 中继节点无法遵守所述基 站发送的全部或部分配置信息、 完整性保护失败、 回程链路中的随机接入问 题、 中继节点的无线链路控制 （RLC )层达到最大次数重传、 以及回程链路 的物理层问题。 其中， 中继节点判断与基站间的回程链路发生无线链路错误后， 继续维持与所 述基站的无线资源控制连接的步骤包括： 所述中继节点接收到基站的配置或 重配置信息后，若判断本中继节点无法遵守所述基站发送的全部或部分配置， 则维持与所述基站的无线资源控制连接； 所述方法还包括： 所述中继节点通知所述基站本次配置发生错误。 其中， 所述中继节点通知所述基站本次配置发生错误的步骤包括： 所述中继节 点不发送响应信令给所述基站； 基站判断在预定时间内没有收到所述中继节 点发送的响应信令， 则认为本次配置发生错误； 或者 所述中继节点通知所述基站本次配置发生错误的步骤包括： 所述中继节 点通过空中接口信令通知基站本次配置失败， 并在所述空中接口信令中携带 配置失败的原因； 所述基站收到所述空中接口信令后， 检查本次配置参数是 否存在问题， 如果是， 则修改配置参数后重新发送给所述中继节点， 否则尝 试再次发送配置参数。 其中，
所述配置失败的原因包括以下原因中的一种或多种：配置的参数不正确、 配置信息的格式不正确、 配置中的数据无线承载（DRB ) 不存在、 配置中的 信令无线承载 （SRB ) 不存在、 配置中的测量标识不存在、 配置中的测量对 象不存在、 以及配置中的测量构造不存在。 其中，
中继节点判断与基站间的回程链路发生无线链路错误后， 继续维持与所 述基站的无线资源控制连接的步骤包括： 所述中继节点接收到数据包后， 根 据所述数据包的内容判断基站下发的数据包的完整性保护失败， 则维持与所 述基站的无线资源控制连接； 所述方法还包括： 所述中继节点通知所述基站完整性保护失败。 其中， 所述中继节点通知所述基站完整性保护失败的步骤包括： 所述中继节点 通过中继节点的专用信道或公共控制信道上的空中接口信令向基站发送完整 性保护失败的信息， 所述信息包括以下一个或多个参数： 无线承载的标识信 息、 计数器（COUNT )值、 完整性保护算法； 或者， 所述中继节点通知所述基站完整性保护失败的步骤包括： 所述中继节点 通过在回程链路使用空的完整性保护算法通知所述基站完整性保护失败。 所述方法还包括： 所述基站获知完整性保护失败后，向所述中继节点返回新的重配置命令， 所述新的重配置命令包含重配置的完整性保护算法的配置参数； 所述中继节 点收到新的重配置命令后， 根据所述重配置的配置参数实施完整性保护。 其中，
中继节点判断与基站间的回程链路发生无线链路错误后， 继续维持与所 述基站的无线资源控制连接的步骤包括： 中继节点判断与基站间的回程链路 出现随机接入问题、 所述中继节点的无线链路控制 （RLC )层达到最大次数 重传、 以及物理层问题之一时， 继续维持与所述基站的无线资源控制连接： 所述方法还包括： 所述中继节点调高其在回程链路中的发射功率。 所述中继节点调高其在回程链路中的发射功率的步骤之前， 所述方法还 包括： 所述基站为所述中继节点设置专用的发射功率上限； 其中， 所述中继节点调高其在回程链路中的发射功率时， 不超过所述专 用的发射功率上限。
所述方法还包括： 所述中继节点调高其在回程链路中的发射功率后， 通过专用信令通知基 站其状态。 为解决上述技术问题， 本发明还提供了一种处理回程链路错误的中继节 点， 该中继节点包括： 判断模块和无线资源控制连接重建模块， 其中： 所述判断模块设置为：判断与基站间的回程链路是否发生无线链路错误； 所述无线资源控制连接重建模块设置为： 在所述判断模块判断本中继节 点与基站间的回程链路发生无线链路错误时， 不发起无线资源控制连接重建 过程。 其中， 所述判断模块是设置为按如下方式判断与基站间的回程链路是否 发生无线链路错误： 接收到基站的配置或重配置信息后， 若判断本中继节点无法遵守所述基 站发送的全部或部分配置， 则判定与基站间的回程链路发生无线链路错误； 或者
接收到数据包后， 根据所述数据包的内容判断基站下发的数据包的完整 性保护失败， 则判定与基站间的回程链路发生无线链路错误； 判断与基站间的回程链路出现随机接入问题、 所述中继节点的无线链路 控制 （RLC )层达到最大次数重传、 以及物理层问题之一时， 则判定与基站 间的回程链路发生无线链路错误。 所述中继节点还包括通知模块， 其中： 所述通知模块设置为： 若判断本中继节点无法遵守所述基站发送的全部 或部分配置， 通知基站回程链路发生无线链路错误， 或者根据所述数据包的 内容判断基站下发的数据包的完整性保护失败， 通知所述基站完整性保护失 败。 本发明通过尽量解决回程链路上出现的问题， 在尽可能短的时间内使回 程链路恢复正常， 增强了回程链路的强壮性， 避免通信的中断， 提高用户体 验。
附图概述 图 1为利用无线中继技术的网络结构示意图； 图 2为本发明实施例一中回程链路错误的判断和处理流程图； 图 3为本发明实施例二中回程链路错误的判断和处理流程图。
本发明的较佳实施方式 本发明的发明构思是： 中继节点判断与基站间的回程链路发生无线链路 错误后 , 继续维持与所述基站的无线资源控制连接。 所述中继节点维持与所述基站的无线资源控制连接是指： 维持所述回程 链路， 不触发无线资源控制连接重建流程。 由于中继节点维持与基站的无线资源控制连接，可避免中继节点下的 UE 通信中断。 所述无线链路错误包括以下错误中的任一种： 中继节点无法遵守所述基 站发送的全部或部分配置信息、 完整性保护失败、 回程链路中的随机接入问 题、 无线链路控制 （Radio Link Control, 简称 RLC )层达到最大次数重传、 以及回程链路的物理层问题。 中继节点与基站交互尽可能修复回程链路中的错误， 保证中继节点管辖 的 UE通信不中断， 增强回程链路的强壮性。
实现上述方法的中继节点包括：判断模块和无线资源控制连接重建模块， 其中： 所述判断模块设置为：判断与基站间的回程链路是否发生无线链路错误； 所述无线资源控制连接重建模块设置为： 在所述判断模块判断本中继节 点与基站间的回程链路发生无线链路错误时， 不发起无线资源控制连接重建 过程。 优选地， 所述中继节点还包括通知模块， 该通知模块设置为： 回程链路 发生无线链路错误后， 通知基站回程链路发生无线链路错误。 所述无线链路错误包括以下错误中的任一种： 中继节点无法遵守所述基 站发送的全部或部分配置信息、 完整性保护失败、 回程链路中的随机接入问 题、 中继节点的 RLC层达到最大次数重传、 以及回程链路的物理层问题。
下面结合具体实施例对本发明进行详细说明。 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任意组合。 实施例一 中继节点 （RN )初始上电后， 实施小区搜索， 选择 Donor eNB下的小 区， 读取其系统消息， 此时中继节点处于空闲状态。 该中继节点根据系统消息中的随机接入资源选择随机接入前缀， 发起随 机接入， 建立 RRC连接， 然后网络侧对其进行鉴权和加密， 在鉴权和加密成 功后， 网络侧通过 RRC连接重配置（ RRC Connection Reconfiguration )为该 中继节点配置用于数据传输的 DRB。在中继节点建立了 DRB之后， 0&M服 务器向该中继节点下发配置数据， 以便中继节点能够实现中继功能， 为其覆 盖范围的用户设备提供服务。 下发的配置数据包括中继节点配置自身系统信 息的参数信息如以下信息的一个或多个： 跟踪区域码（Tracking Area Code ) 、 小区的标识（Cell Identity )、 以及小区选择 /重选的参数， 还可能包括中继节 点处于中继功能使能连接状态所需的配置参数如以下信息的一个或多个： R-PDCCH配置信息、 R-PDSCH配置信息、 R-PUSCH配置信息、 中继节点 专用的调度请求 （ Scheduling Request ) 的配置信息、 调度中继节点的子帧信 息（或者称为 Fake MBSFN子帧） 、 以及中继节点特定的标识等（中继功能 使能连接状态所需的配置参数也可以由 Donor-eNB 通过空中接口信令如 RRC连接重配置发送给中继节点）。 中继节点获得这些配置信息后， 初始化 必须的参数从而为能够以中继功能提供小区服务做准备， 中继节点需要初始 化相关的计数器和状态变量， 并合理配置所提供小区的系统信息等。 过了一 段时间， 当中继节点完成了初始化工作， 基站以 R-PDCCH的方式开始调度 该中继节点， 中继节点处于中继功能使能连接状态， 可以为其下覆盖范围的 用户设备提供服务。 中继节点处于中继功能使能连接状态后， 在回程链路， Donor eNB像普 通的用户设备一样管理中继节点， 包括： 为其增加、 修改、 或删除 DRB 的 配置， 为其增加、 修改、 或删除测量配置， 为其建立或释放半静态调度 ( semi-persistent scheduling, 简称 SPS ) , 为其配置媒质接入控制 （Medium Access Control , 简称 MAC )层的配置（ MAC-MainConfig ) , 为其配置物理 层专用的配置 （ physicalConfigDedicated )等， 通常 Donor eNB通过 RRC连 接重配置实现这部分功能。 Donor eNB也可以通过其他的空中接口信令如： 从演进的通用陆基无线接入网 （Evolved Universal Terrestrial Radio Access Network , 简称 E-UTRAN )系统切换命令 ( MobilityFromEUTRACommand )、 或新增的信令， 实现所述的配置。 上述配置内容可能在一条配置信令中发送 也可能分多条配置信令发送。 回程链路错误的判断和处理过程参见图 2, 包括如下步骤： 步骤 210 , 当中继节点接收到基站的配置或重配置信息后， 若判断基站 的配置错误或由于其他非本中继节点的原因， 使得本中继节点不能遵守基站 发送々全" ^或" ^分西己置 ( unable to comply with (part of) the configuration ) , 则认为与基站间的回程链路发生无线链路错误， 中继节点维持目前的回程链 路， 即不触发无线资源控制连接重建 ( RRC Connection Reestablishment ) ； 当基站发送的部分配置无误时， 中继节点可以使用该没有发生错误的部 分配置。 如果中继节点能够遵守基站的配置， 则按照正常流程执行。 步骤 220, 中继节点通知基站本次配置发生错误； 中继节点可釆用以下方式之一通知基站本次配置发生错误： 中继节点通过不发送响应信令如无线资源控制连接重配置完成 （RRC Connection Reconfiguration Complete )信令通 口基占本次西己置发生错误 , J¾时 基站被配置为在预定时间内未收到响应， 则默认此次下发的配置存在问题； 中继节点直接通过空中接口信令通知基站此次配置失败， 具体可以是： 部分配置成功、 部分配置失败或全部配置失败。 优选地， 可在空中接口信令 中携带配置失败的原因， 具体配置失败的原因可以是以下原因中的一种或多 种： 配置的参数不正确、 配置信息的格式不正确、 配置中的 DRB 不存在、 配置中的 SRB不存在、配置中的测量标识不存在、配置中的测量对象不存在、 以及配置中的测量构造不存在等。中继节点可以通过 RRC信令如无线资源控 制连接重配置完成信令、 或新增的无线资源控制连接重配置失败信令等通知 基站此次配置失败。 至此， 中继节点部分的处理完成。 对基站而言， 基站在获知本次配置发生错误后， 对本次配置进行纠正。 具体地， 基站在预定时间内没有收到中继节点发送的响应， 或者收到配置失 败的空中接口信令后， 则检查自己此次配置的参数是否存在问题， 如果配置 的参数存在问题则需要修改， 则修改后重新发送， 这样可以避免以后再发送 类似的配置信息给中继节点； 如果配置的参数是正确的， 则可能是无线传输 中出现问题， 可以尝试再次发送这部分配置信息。 如果中继节点只通知基站配置失败， 则基站检查所有配置参数， 如果中 继节点携带了失败原因， 则基站根据失败原因检查引发错误的那部分配置。 例如，某个时刻，基站通过 RRC连接重配置向中继节点发送增加测量任 务的信令， 其中包括测量标识， 测量标识指示的测量对象以及关联的测量构 造（ reporting configuration ) , 由于该测量任务对应的测量构造没有定义 (该 测量构造没有定义或定义后又被删除） ， 中继节点不能遵守此次的配置， 中 继节点继续维持与服务小区的无线资源控制连接， 不触发无线资源控制连接 重建。 中继节点可以向基站发送 RRC连接重配置失败的信令、 或在 RRC连 接重配置完成信令中包含配置失败的信息， 通知基站本次新增测量任务的重 配置失败。基站获得失败的信息后，检测向中继节点发送 RRC连接重配置信 令中包含的信息， 如果存在错误， 修改其中的错误配置， 再次向中继节点发 送新的配置信息； 或者不再向中继节点发送相同的配置信息。
在本实施例中， 所述中继节点中的判断模块还设置为： 判断本中继节点 是否无法遵守所述基站发送的全部或部分配置， 如果是， 则所述无线资源控 制连接重建模块不发起无线资源控制连接重建过程； 此外所述中继节点还包 括通知模块， 该通知模块设置为： 在所述判断模块判断本中继节点无法遵守 所述基站发送的全部或部分配置时， 通过空中接口信令通知基站该回程链路 发生无线链路错误。
实施例二 中继节点接入 Donor eNB下的小区， 处于中继功能使能连接状态。 中继 节点在回程链路的 Fake MB SFN子帧中监听 R-PDCCH , 基站已经为该中继 节点配置了力。密算法 （ ciphering algorithm ) 和完整性保护算法 （ integrity protection algorithm ) 。 在回程链路， 作为接收端， 中继节点需要计算数据包 协议数据单元（Protocol Data Unit, 简称 PDU ) 的 X-MAC (即 Computed MAC-I ) , 如果计算的 X-MAC与接收的对应数据包中的消息完整性验证码 ( Message Authentication Code for Integrity, 简称 MAC-I )是一致的， 则证明 完整性保护是成功的， 否则证明不成功。 计算 X-MAC的参数包括计数器 COUNT值、方向参数 ( DIRECTION ) 、 无线承载标识（ BEARER )、以及密钥（ Key即 KRRCmt或 Kupmt )。其中 COUNT 值由超帧号 （Hyper Frame Number, 简称 HFN )和分组数据会聚协议序号 ( Packet Data Convergence Protocol Sequence Number, 简称 PDCP SN )构成。 本实施例回程链路错误的判断和处理过程参见图 3 , 包括如下步骤： 步骤 310, 中继节点接收到数据包后， 根据数据包的内容判断基站下发 的数据完整性保护失败， 则认为与基站间的回程链路发生无线链路错误， 中 继节点维持与服务小区的无线资源控制连接，不触发无线资源控制连接重建； 中继节点每收到数据包进行一次数据完整性保护失败与否的检查。 当中继节点判断计算的数据包的 X-MAC与接收的 MAC-I—致，则认为 数据完整性保护成功， 如果不一致， 认为失败数据完整性保护。 步骤 320, 中继节点通知基站回程链路发生无线链路错误， 在本实施例 中， 无线链路错误即指完整性保护失败； 中继节点通过专用信道上的空中接口信令或公共控制信道（Common
Control Channel, 简称 CCCH )上新增的空中接口信令向基站上报出现完整 性保护失败的问题， 如发送完整性保护失败的信息， 优选的， 在该信息中包 含以下完整性保护失败对应的一个或多个参数： 无线承载的标识信息、 COUNT值、 以及完整性保护算法。 由于此时上行链路是没有问题的， 中继 节点可以沿用原来的完整性保护算法向基站发送完整性保护失败的信息， 此 时基站需要釆用与中继节点相同的算法来解析中继节点发送的信令。 或者， 中继节点通过在回程链路使用空的完整性保护算法 （ 'NULL' integrity protection algorithm(eiaO) )通知基站完整性保护失败， 使用空的完整性保护 算法是指中继节点不应用完整性保护算法， 具体地， 中继节点在发送完整性 保护失败的信息或者其他数据时使用空的完整性保护算法， 基站在检测到中 继节点使用空的完整性保护算法后， 获知完整性保护失败。 至此， 中继节点部分的处理完成。 基站部分的处理如下： 步骤 330 , 基站在获知完整性保护失败后， 向中继节点返回新的重配置 信令， 其中包含重配置的完整性保护算法的配置参数， 如 COUNT值和新的 完整性保护算法等； 优选地， 在其他实施例中， 基站也可以在重配置信令中指示中继节点不 应用完整性保护算法。 步骤 340 , 中继节点收到新的重配置命令后， 根据新配置的参数实施完 整性保护。 具体地， 中继节点探测到了完整性保护失败， 基站可以向中继节点发起 安全配置的更新流程将新的算法发送给中继节点， 比如基站向中继节点发送 小区内切换或跨小区的切换， 在切换命令中包含新的加密算法和完整性保护 算法， 如果中继节点不能配置 （或遵守）新的加密算法和完整性保护算法， 中继节点仍然使用原来的加密算法和完整性保护算法与基站保持通信。
在本实施例中， 所述中继节点中的判断模块还设置为： 判断基站下发的 数据包的完整性保护是否失败， 如果是， 则所述无线资源控制连接重建模块 不发起无线资源控制连接重建过程； 此外所述中继节点还包括通知模块， 该 通知模块设置为： 在所述判断模块判断基站下发的数据包的完整性保护失败 时， 通过中继节点的专用信道或公共控制信道上的空中接口信令或通过使用 空的完整性保护算法通知基站该回程链路发生无线链路错误， 如向基站发送 完整性保护失败的信息。
实施例三 中继节点接入 Donor eNB下的小区， 处于中继功能使能连接状态。 当中 继节点探测到回程链路中的随机接入问题（ Random access problem , 即 MAC 层探测到随机接入过程中最大次数的导频 （preamble )发送） 、 或所述中继 节点的 RLC层达到最大次数重传的问题、或回程链路的物理层问题（中继节 点上物理层向 RRC层指示的错误， 例如 PDCCH出现失步（ out-of-sync )且 T310超时）时， 认为与基站间的回程链路发生无线链路错误， 中继节点维持 与原小区的无线资源控制连接， 不触发无线资源控制连接重建， 中继节点调 高其在回程链路中的发射功率， 这样可以使基站收到中继节点的发射信号功 率增强， 提高检测的效果。 所述随机接入问题是中继节点上 MAC层向 RRC层指示的错误， 所述 RLC层达到最大次数重传的问题是中继节点上 RRC层向 RLC层指示的错 误。 在现有的系统消息中广播允许的发射功率上限 Pmax, 所有的用户设备 和中继节点不能超过这个上限， 但是为了避免中继节点因为回程链路的问题 使其覆盖下的用户设备出现通信中断， 允许中继节点在探测到回程链路中的 随机接入问题、或 RLC层达到最大次数重传的问题、或回程链路的物理层问 题时调高发射功率 （即允许超过 Pmax ) 。 或者基站为中继节点设置专用的 发射功率上限， 中继节点在发现随机接入问题、或 RLC层达到最大次数重传 的问题、 或回程链路的物理层问题时， 调高其在回程链路中的发射功率， 但 不得超过该专用的发射功率上限。 在提高基站信号检测能力的同时， 对其他 基站覆盖范围的用户设备也将产生干扰， 如果干扰严重， 基站可以将该中继 节点切换到相邻的小区。 需要说明的是， 中继节点可以在提高自身发射功率的同时， 在某些情况 下 （如中继节点检测到基站发射的参考信号的功率减小时、 或回程链路的物 理层出现问题时） ， 通过空中接口信令请求基站提高下行的发射功率， 以确 保中继节点回程链路的信号传输质量， 然后基站可以将该中继节点切换到相 邻的小区避免对其他的用户设备产生干扰。 中继节点提高发射功率后， 可以 通过专用信令通知基站其状态， 以便基站能够及时处理这一状况。 基站也可 以通过中继节点上报的服务小区的测量报告计算出路径损耗， 从而间接获得 中继节点提高发送功率的状况， 基站可以将中继节点切换到合适的目标小区 防止中继节点对其他的用户设备产生严重干扰。 在本实施例中， 所述中继节点中的判断模块还设置为： 判断本中继节点 与基站的回程链路是否出现以下问题中的一种： 随机接入问题、 所述中继节 点的 RLC层达到最大次数重传、 以及物理层问题， 如果是， 则所述无线资源 控制连接重建模块不发起无线资源控制连接重建过程； 此外所述中继节点还 包括发射功率调整模块， 该发射功率调整模块设置为： 在所述判断模块判断 所述无线链路出现上述问题时， 调高在回程链路中的发射功率。
当然， 本发明还可有其它多种实施例， 在不背离本发明精神及其实质的 但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
工业实用性 本发明通过尽量解决回程链路上出现的问题， 在尽可能短的时间内使回 程链路恢复正常， 增强了回程链路的强壮性， 避免通信的中断， 提高用户体 验。

Claims

权 利 要 求 书
1、 一种处理回程链路错误的方法， 该方法包括： 中继节点判断与基站间的回程链路发生无线链路错误后， 继续维持与所 述基站的无线资源控制连接。
2、 如权利要求 1所述的方法， 其中， 所述中继节点维持与所述基站的无线资源控制连接是： 所述中继节点不 触发无线资源控制连接重建流程。
3、 如权利要求 1所述的方法， 其中， 所述无线链路错误包括以下错误中的任一种： 中继节点无法遵守所述基 站发送的全部或部分配置信息、 完整性保护失败、 回程链路中的随机接入问 题、 中继节点的无线链路控制 （RLC )层达到最大次数重传、 以及回程链路 的物理层问题。
4、 如权利要求 1或 2或 3所述的方法， 其中， 中继节点判断与基站间的回程链路发生无线链路错误后， 继续维持与所 述基站的无线资源控制连接的步骤包括： 所述中继节点接收到基站的配置或 重配置信息后，若判断本中继节点无法遵守所述基站发送的全部或部分配置， 则维持与所述基站的无线资源控制连接； 所述方法还包括： 所述中继节点通知所述基站本次配置发生错误。
5、 如权利要求 4所述的方法， 其中， 所述中继节点通知所述基站本次配置发生错误的步骤包括： 所述中继节 点不发送响应信令给所述基站； 基站判断在预定时间内没有收到所述中继节 点发送的响应信令， 则认为本次配置发生错误； 或者 所述中继节点通知所述基站本次配置发生错误的步骤包括： 所述中继节 点通过空中接口信令通知基站本次配置失败， 并在所述空中接口信令中携带 配置失败的原因； 所述基站收到所述空中接口信令后， 检查本次配置参数是 否存在问题， 如果是， 则修改配置参数后重新发送给所述中继节点， 否则尝 试再次发送配置参数。
6、 如权利要求 5所述的方法， 其中， 所述配置失败的原因包括以下原因中的一种或多种：配置的参数不正确、 配置信息的格式不正确、 配置中的数据无线承载（DRB ) 不存在、 配置中的 信令无线承载 （SRB ) 不存在、 配置中的测量标识不存在、 配置中的测量对 象不存在、 以及配置中的测量构造不存在。
7、 如权利要求 1或 2或 3所述的方法， 其中， 中继节点判断与基站间的回程链路发生无线链路错误后， 继续维持与所 述基站的无线资源控制连接的步骤包括： 所述中继节点接收到数据包后， 根 据所述数据包的内容判断基站下发的数据包的完整性保护失败， 则维持与所 述基站的无线资源控制连接； 所述方法还包括： 所述中继节点通知所述基站完整性保护失败。
8、 如权利要求 7所述的方法， 其中， 所述中继节点通知所述基站完整性保护失败的步骤包括： 所述中继节点 通过中继节点的专用信道或公共控制信道上的空中接口信令向基站发送完整 性保护失败的信息， 所述信息包括以下一个或多个参数： 无线承载的标识信 息、 计数器（COUNT )值、 完整性保护算法； 或者， 所述中继节点通知所述基站完整性保护失败的步骤包括： 所述中继节点 通过在回程链路使用空的完整性保护算法通知所述基站完整性保护失败。
9、 如权利要求 8所述的方法， 所述方法还包括： 所述基站获知完整性保护失败后，向所述中继节点返回新的重配置命令， 所述新的重配置命令包含重配置的完整性保护算法的配置参数； 所述中继节 点收到新的重配置命令后 , 根据所述重配置的配置参数实施完整性保护。
10、 如权利要求 1或 2或 3所述的方法， 其中， 中继节点判断与基站间的回程链路发生无线链路错误后， 继续维持与所 述基站的无线资源控制连接的步骤包括： 中继节点判断与基站间的回程链路 出现随机接入问题、 所述中继节点的无线链路控制 （RLC )层达到最大次数 重传、 以及物理层问题之一时， 继续维持与所述基站的无线资源控制连接： 所述方法还包括： 所述中继节点调高其在回程链路中的发射功率。
11、如权利要求 10所述的方法，所述中继节点调高其在回程链路中的发 射功率的步骤之前， 所述方法还包括：
所述基站为所述中继节点设置专用的发射功率上限； 其中， 所述中继节点调高其在回程链路中的发射功率时， 不超过所述专 用的发射功率上限。
12、 如权利要求 10所述的方法， 所述方法还包括： 所述中继节点调高其在回程链路中的发射功率后， 通过专用信令通知基 站其状态。
13、 一种处理回程链路错误的中继节点， 该中继节点包括： 判断模块和 无线资源控制连接重建模块， 其中： 所述判断模块设置为：判断与基站间的回程链路是否发生无线链路错误； 所述无线资源控制连接重建模块设置为： 在所述判断模块判断本中继节 点与基站间的回程链路发生无线链路错误时， 不发起无线资源控制连接重建 过程。
14、如权利要求 13所述的中继节点， 其中， 所述判断模块是设置为按如 下方式判断与基站间的回程链路是否发生无线链路错误： 接收到基站的配置或重配置信息后， 若判断本中继节点无法遵守所述基 站发送的全部或部分配置， 则判定与基站间的回程链路发生无线链路错误； 或者
接收到数据包后， 根据所述数据包的内容判断基站下发的数据包的完整 性保护失败， 则判定与基站间的回程链路发生无线链路错误； 判断与基站间的回程链路出现随机接入问题、 所述中继节点的无线链路 控制 （RLC )层达到最大次数重传、 以及物理层问题之一时， 则判定与基站 间的回程链路发生无线链路错误。
15、如权利要求 14所述的中继节点， 所述中继节点还包括通知模块， 其 中：
所述通知模块设置为： 若判断本中继节点无法遵守所述基站发送的全部 或部分配置， 通知基站回程链路发生无线链路错误， 或者根据所述数据包的 内容判断基站下发的数据包的完整性保护失败， 通知所述基站完整性保护失 败。
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WO2010013980A2 (ko) * 2008-08-01 2010-02-04 엘지전자주식회사 중계기를 포함하는 무선통신 시스템에서 백홀링크 및 액세스링크를 위한 자원할당 방법

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EP3703407A4 (en) * 2017-11-10 2020-11-11 Guangdong Oppo Mobile Telecommunications Corp., Ltd. INFORMATION TRANSMISSION PROCESS, NETWORK DEVICE, AND TERMINAL DEVICE
US11553344B2 (en) 2017-11-10 2023-01-10 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Information transmission method, network device and terminal device

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