WO2011032319A1 - 小区无线链路失败处理方法和用户设备 - Google Patents

小区无线链路失败处理方法和用户设备 Download PDF

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Publication number
WO2011032319A1
WO2011032319A1 PCT/CN2009/074054 CN2009074054W WO2011032319A1 WO 2011032319 A1 WO2011032319 A1 WO 2011032319A1 CN 2009074054 W CN2009074054 W CN 2009074054W WO 2011032319 A1 WO2011032319 A1 WO 2011032319A1
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WO
WIPO (PCT)
Prior art keywords
cell
user equipment
radio link
carrier
current
Prior art date
Application number
PCT/CN2009/074054
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English (en)
French (fr)
Inventor
李亚娟
常俊仁
Original Assignee
华为技术有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2009/074054 priority Critical patent/WO2011032319A1/zh
Priority to CN200980146459.XA priority patent/CN102265669B/zh
Publication of WO2011032319A1 publication Critical patent/WO2011032319A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a cell radio link failure processing method and a user equipment.
  • Carrier aggregation technology mainly aggregates multiple component carriers into a carrier higher than 20MHz to support high-speed data transmission.
  • CoMP Coordinatd Multi-point
  • the CoMP technology now has two basic modes: CS (Coordinated scheduling and/or beamforming) mode and JP (Joint processing/transmission) mode.
  • CS mode data is transmitted from one transmission point to one UE (User Equipment); in JP mode, data is simultaneously transmitted from multiple transmission points to one UE.
  • UE User Equipment
  • JP mode data is simultaneously transmitted from multiple transmission points to one UE.
  • multiple cells within a CoMP set multipoint coordinated transmission set
  • the service cell of the user equipment may fail to cause the radio link to fail, causing the user equipment to fail to work normally. How to ensure the user equipment's work becomes a problem when the radio link fails in the service area.
  • the embodiment of the present invention provides a cell radio link failure processing method and a user equipment, so as to implement handover of a serving cell when a radio link fails in the serving cell, to ensure normal operation of the user equipment.
  • An embodiment of the present invention provides a method for processing a radio link failure of a cell, including:
  • the current cell is a serving cell of the user equipment, indicating that one other cell is changed to the serving cell of the user equipment.
  • the embodiment of the invention further provides a user equipment, including:
  • a cell failure determining unit configured to determine that a radio link failure occurs in the current cell, and check whether other cells exist to provide services for the user equipment;
  • a cell change indication unit configured to acquire a check result of the cell failure determining unit, when there is at least one other cell serving the user equipment, and the current cell is a serving cell of the user equipment, indicating another The cell is changed to a serving cell of the user equipment.
  • the embodiment of the present invention may indicate that the cell that is serving the user equipment is changed to the serving cell to implement the function of the serving cell, and the user equipment is ensured. Normal communication.
  • the embodiment of the invention further provides a carrier radio link failure detection method, including:
  • the embodiment of the invention further provides a user equipment, including:
  • timing initiation unit configured to start timing when a hybrid automatic repeat request fails on the carrier
  • number statistics unit configured to: after the timing of the timing initiation unit arrives, the carrier automatically appears in the statistical timing period The number of times the retransmission request failed
  • the failure judging unit is configured to determine that the radio link fails when the number of statistics reaches a predetermined threshold.
  • the embodiment of the present invention only needs to count the number of times that a carrier fails to generate a hybrid automatic repeat request within a period of time, and compares with a predetermined threshold to detect whether a carrier has a wireless link. Failure, realization of the single ⁇
  • FIG. 1 is a schematic diagram of a cell radio link failure detection method according to a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of a cell radio link failure processing method according to Embodiment 2 of the present invention
  • FIG. 4 is a schematic diagram of a carrier radio link failure detecting method according to Embodiment 4 of the present invention
  • FIG. 5 is a schematic diagram of a cell radio chain according to Embodiment 5 of the present invention; Schematic diagram of road failure detection and processing methods;
  • FIG. 6 is a schematic diagram of a user equipment according to Embodiment 6 of the present invention.
  • FIG. 7 is a schematic diagram of a user equipment according to Embodiment 7 of the present invention.
  • Embodiment 8 is a schematic diagram of a user equipment according to Embodiment 8 of the present invention.
  • FIG. 9 is a schematic diagram of a user equipment according to Embodiment 9 of the present invention.
  • FIG. 10 is a schematic diagram of a method for determining a cell in which a radio link failure occurs according to Embodiment 10 of the present invention
  • FIG. 11 is a schematic diagram of a user equipment according to Embodiment 11 of the present invention.
  • FIG. 1 is a schematic diagram of a cell radio link failure detection method according to Embodiment 1 of the present invention, where the method includes: S11: determining that a radio link failure occurs on a current component carrier of the user equipment;
  • S12 Check whether there are other component carriers that provide services for the user equipment in the current cell; S13: When there is no other component carrier serving the user equipment in the current cell, determining that the current cell is wireless The link failed.
  • the current cell is a cell that provides a service for the user equipment;
  • the current component carrier and other component carriers that provide services for the user equipment are component carriers configured by the current cell for the user equipment, and these are The component carrier is used to provide service for the user equipment;
  • the radio link failure may include an uplink radio link failure and/or a downlink radio link failure.
  • the current component carrier that is, the coordinated transmission cell group is configured for the current user equipment.
  • the composition of the carrier is configured for the current user equipment.
  • the current component carrier is a downlink component carrier.
  • the physical layer of the user equipment detects that the current downlink component carrier is out-of-sync, and reports a first indication message to the RRC (Radio Resource Control) layer of the user equipment to indicate that the downlink component carrier appears. Out of step.
  • the RRC layer receives the first indication message, and starts a timer T310, if the RRC layer receives an in-sync message of the physical layer within a timing time of the timer T310. The timer T310 is stopped.
  • the RRC layer receives the first indication message in the time period of the timer T310, the downlink component link is considered to have failed. It can be understood that there is another method in the prior art for the RRC layer to detect whether the current downlink component carrier has a downlink radio link failure, which is not limited in this embodiment.
  • the current component carrier is an uplink component carrier.
  • the MAC (Media Access Control) layer of the user equipment may report a second indication message to the RRC layer of the user equipment when the random access failure occurs on the current uplink component carrier, to indicate that the current uplink component carrier has random access. failure.
  • the RRC layer receives the second indication information.
  • the RRC layer may check whether the timers T300, T301, T304, and T311 are enabled. If the timers T300, T301, T304, and T311 are not enabled, the RRC layer is indicated. No connection establishment, connection re-establishment, or connection reconfiguration is performed, and the uplink component carrier fails to uplink wireless link. It can be understood that there are other methods for detecting whether the current uplink component carrier has a radio link failure.
  • the RLC (Radio Link Control) layer of the user equipment can achieve the maximum retransmission on the current uplink component carrier.
  • the third indication message is sent to the RRC layer of the user equipment to indicate that the current uplink component carrier has failed to retransmit, and the RRC layer receives the third indication message, and considers that the uplink component carrier has an uplink radio link failure.
  • the RLC layer sends a third indication message to the RRC layer when the maximum number of retransmissions is reached, indicating that a retransmission failure occurs, but it may not be specified which component carrier retransmission failed.
  • the RRC layer receives the third indication message, and may consider that a radio link failure occurs in the entire wireless connection.
  • this embodiment is not enumerated.
  • the method may further include: when the user equipment has other component carriers that have failed to generate a radio link, send a notification signaling to the serving node in the current cell to notify the service node of the The radio link failed on the current component carrier.
  • the serving node may be a base station (eNodeB) or a relay node (RN).
  • the sending notification signaling may be implemented by using any one of the other component carriers that do not have a radio link failure.
  • FIG. 2 is a schematic diagram of a cell radio link failure processing method according to Embodiment 2 of the present invention, where the method includes:
  • the cells serving the user equipment include two types: a Serving Cell and an Assist Cell. Although both the serving cell and the secondary cell provide services for the user equipment, the secondary cell functions as an auxiliary service.
  • a user equipment can provide services for multiple cells at the same time, where there can be only one serving cell and multiple secondary cells.
  • the current cell is the serving cell of the current user equipment and the radio link fails in the current cell, the current user equipment may indicate that another auxiliary cell that is serving the user equipment is changed to The serving cell enables the later cell to implement the serving cell function and ensures normal communication of the user equipment.
  • the method described in this embodiment is applicable to a single carrier cell and a multicarrier cell.
  • the cell radio link failure processing method in the second embodiment may be combined with the cell radio link failure detecting method in the first embodiment, and may continue to be used when detecting the cell radio link failure.
  • the method described in Example 2 was carried out.
  • the cell in which the user equipment has several services, and which of these cells is the serving cell of the user equipment it may be pre-configured.
  • how to determine that the radio link failure of the current cell may not pass the detection method, but the notification message of the receiving base station or other node may be used to learn that the radio link fails in the current cell.
  • the other cell may be instructed to change to the serving cell of the current user equipment.
  • the serving cell indicating that a cell is changed to the current user equipment, that is, the base station indicating the cell performs the cell change.
  • the method may further include: when there is at least one other cell serving the current user equipment, and the current cell is a secondary cell of the current user equipment, notifying the serving cell of the current user equipment that the current cell is wireless.
  • the link failed If the cell in which the radio link fails is the secondary cell of the current user equipment, the serving cell of the current user equipment necessarily exists in the at least one other cell, and the current user equipment may notify the service that the current secondary cell fails the radio link.
  • the cell is processed by its serving cell.
  • the current user equipment may also notify other secondary cells of the current secondary cell radio link failure message. Specifically, when the current user equipment notifies the serving cell of the current secondary cell radio link failure message, the message used for the notification may be newly defined, or some field may be added to the existing message as a notification message to indicate that the wireless device is generated. The link failed.
  • the method may further include: attempting to resume connection with the current cell when there is no other cell providing service for the current user equipment.
  • FIG. 3 is a schematic diagram of a method for changing a serving cell according to Embodiment 3 of the present invention, where the method includes:
  • S31 A secondary cell of the current user equipment is used as the target serving cell
  • S32 Send an uplink resource allocation request message to the base station of the current user equipment.
  • S33 Receive a connection setup message sent by the base station, and establish a connection with the target serving cell.
  • the user equipment may choose to establish a connection with the secondary cell. After the connection is established, the original secondary cell will become the serving cell of the user equipment, and the serving cell change is completed.
  • the method is applicable to the single carrier cell and the multi-carrier cell.
  • the corresponding serving cell change may be performed, and a supplementary cell of the user equipment is changed to the serving cell.
  • the corresponding cell change can be applied not only to the scenario where the radio link fails, but also to other scenarios in which the serving cell change needs to be performed.
  • the connection establishment message includes, but is not limited to, a RRC connection establishment message, a RRC connection re-establishment message, a RRC connection reconfiguration message, and the like, and the message is established for the user equipment to establish a connection with the cell.
  • the message is provided to the base station of the current user equipment, and then the base station sends a connection setup message to the user equipment to indicate that the user equipment can establish a connection with the target serving cell.
  • the using the auxiliary cell of the current user equipment as the target serving cell may include: when the current user equipment has multiple secondary cells, selecting an auxiliary cell from the multiple secondary cells as the target serving cell.
  • the criteria for selecting a target serving cell may be the quality of the cell. That is to say, the user equipment can select the cell with the best quality of service from the multiple secondary cells as the target serving cell, and ensure good communication quality.
  • the uplink resource allocation request message sent by the base station of the target serving cell is a preamble signal, and after the preamble signal is sent, the user equipment may receive a timing adjustment command sent by the base station of the target serving cell (TA And an uplink grant ( Grant), and initiate a connection request to the base station of the target serving cell.
  • the initiating a connection request to the base station of the target serving cell may be to send a RRC Connection Reestablishment Request (RRC Connection Reestablishment Request) message to the base station of the target serving cell, where other messages may be sent instead, such as sending a radio resource control connection.
  • the message sent may also include reasons such as connection re-establishment, re-configuration, etc., such as the failure of the radio link in the serving cell.
  • the sending, by the base station of the target serving cell, the uplink resource allocation request message may further include: sending a dedicated preamble signal to the base station of the target serving cell, where the dedicated preamble signal is used for the target
  • the serving cell indicates that the current user equipment needs to change the serving cell.
  • the dedicated preamble signal may be preset so that both the user equipment and the base station can know the role of the dedicated preamble signal.
  • the user equipment may send the dedicated preamble when a radio link failure occurs in its serving cell If the base station of the target serving cell receives the signal, it can know that the user equipment has failed to generate a radio link in its current cell, and if the base station of the target serving cell agrees to change the serving cell, it can send an RRC Connection Reestablishment or an RRC Connection Reconfiguration. The message is sent to the user equipment, so that the user equipment can complete the connection establishment with the target serving cell.
  • the uplink resource allocation request message may be a PUCCH SR (Scheduling Request). After receiving the PUCCH SR, the corresponding cell can know which user equipment sent the request, thereby further instructing the user equipment to perform connection re-establishment.
  • the embodiment of the invention further provides a new radio link failure detection method, which can conveniently detect whether a carrier has a radio link failure.
  • 4 is a schematic diagram of a carrier radio link failure detection method according to Embodiment 4 of the present invention, where the method includes:
  • S43 When the counted number reaches a predetermined threshold, determine that the carrier fails to generate a radio link.
  • This embodiment provides a new method for detecting whether a carrier has a radio link failure. The method may be performed at the MAC layer, and the number of hybrid automatic repeat request failures on the MAC layer is counted on the carrier to determine whether the carrier is generated. The wireless link fails, and cross-layer detection is not required to implement the order. Further, when the MAC layer detects that a carrier has failed to generate a radio link, it may notify the RRC layer of the detection result, and the RRC layer counts and counts the number of failures to determine whether the carrier has a wireless link failure. This embodiment is applicable to the detection of uplink radio link failure of a carrier.
  • the method may further include: appearing on the carrier before the timing time arrives When the hybrid automatic repeat request succeeds or enters the discontinuous reception (DRX, Discontinuous Reception) state on the carrier, the timing is terminated.
  • DRX discontinuous reception
  • the above-described carrier radio link failure detecting method is applicable to the case of single carrier or multi-carrier.
  • the multi-carrier case after determining that a radio link fails on a certain carrier, it is required to determine whether the carrier that failed the radio link is an anchor carrier, and if the carrier that fails the radio link is the current user equipment.
  • the Anchor carrier needs to update the Anchor carrier, that is, change another carrier that does not have a radio link failure to an Anchor carrier.
  • the carrier that fails the radio link failure as the new anchor carrier can be determined by the user equipment.
  • the user equipment can notify the base station of the update result.
  • the user equipment can also notify the base station of the need to change the Anchor carrier, and then the base station determines the new Anchor carrier and notifies the user equipment of the determination result.
  • a timer may be set for each carrier at the MAC layer of the user equipment to count the number of HARQ failures on the carrier.
  • the MAC layer finds that a HARQ failure occurs on a certain carrier, it checks whether the timer T corresponding to the carrier is started. If the timer T has not been started, the timer T is started, and the HARQ on the carrier is started to be recorded. Number of failures; if the timer T has been started, the number of HARQ failures of the carrier is increased by one.
  • the MAC layer finds that the HARQ is successful on a certain carrier, it checks whether the corresponding timer T is started.
  • the timer T If the timer T has been started, the timer T is stopped, and the number of recorded HARQ failures is reset to zero.
  • the MAC layer finds that it enters the DRX state on a certain carrier, it checks whether the timer T corresponding to the carrier is started. If the timer T starts, the timer T is stopped, and the number of recorded HARQ failures is reset to zero.
  • the MAC layer finds that a timer T times out, it checks the number of HARQ failures of the corresponding carrier that has been recorded by the timer T.
  • the carrier If the number of failures reaches a predetermined number of thresholds, the carrier considers that the carrier has failed the radio link; If the number of times does not reach the predetermined number of times, the number of HARQ failures of the corresponding carrier recorded is reset to zero.
  • the threshold of the number of times may be configured by the network.
  • the network may carry the configuration in a system message, and may carry the configuration in a specific connection establishment, reconfiguration, re-establishment, and the like, so that the user equipment According to the message, the network configuration can be known.
  • the MAC layer may only detect a single HARQ failure or success on each carrier. If a HARQ failure occurs on a certain carrier, the specific carrier and its HARQ failure information are sent to the RRC layer, and the RRC layer performs the RRC layer. Detection and statistics of uplink radio link failures.
  • the RRC layer can immediately start the timer T and record the number of HARQ failures once it receives an indication that a carrier has failed the uplink radio link. During the start of the timer, once the MAC layer succeeds in HARQ on a certain carrier, or the MAC layer enters the DRX state on the carrier, it immediately instructs the RRC layer to stop the timer T.
  • the RRC layer can determine whether the counter reaches a predetermined threshold. If the predetermined threshold is reached, the carrier corresponding to the counter is considered to have failed the uplink radio link, otherwise the timer is turned off and the counter is reset to zero. Different from the previous MAC layer detection method, the method can detect whether the carrier has an uplink radio link failure through the joint detection of the MAC layer and the RRC layer.
  • FIG. 5 is a schematic diagram of a cell radio link failure detection and processing method according to Embodiment 5 of the present invention, where the method includes:
  • S51 Determine, by detecting, that a current component carrier has a radio link failure.
  • Embodiment 1 There are various methods for detecting whether a current component carrier has a radio link failure, and the method described in Embodiment 1 can be used.
  • the physical layer of the user equipment reports an indication message to the RRC layer, indicating that the current component carrier has a radio link abnormality. After receiving the indication, the RRC layer may further determine whether the current component carrier has a radio link failure, and the determination method is not described again.
  • the MAC layer carrier radio link failure detection method described in the fourth embodiment may also be used for detecting. When a hybrid auto-retransmission request fails on a component carrier, the timing starts, and the hybrid automatic weight of the component carrier appears in the statistical timing time. The number of failed requests is determined, and by comparing the number of times with a predetermined threshold, it is determined whether a radio link failure occurs in the component carrier.
  • S52 Check whether the current user equipment has other component carriers, and if yes, execute S53; If no, then S54 is performed. How many component carriers exist in the current user equipment is usually configured by the system.
  • S53 Send a notification signaling to the serving node in the current cell to notify the serving node that the current component carrier has a radio link failure. If the carrier that fails the radio link is the Anchor carrier of the current user equipment, the base station needs to be notified to change the Anchor carrier, that is, the Anchor carrier is changed to another carrier that does not have a radio link failure.
  • One other cell is used as the target serving cell. Specifically, when there are multiple other cells that are also providing services for the user equipment, the cell with the best quality of service may be selected as the target serving cell among the plurality of other cells. Of course, the method of selecting the secondary cell may have other manners. No longer open.
  • S59 Send an uplink resource allocation request message to the base station of the target serving cell.
  • S510 Receive a message such as a radio resource control connection establishment, a radio resource control connection re-establishment, or a connection reconfiguration sent by the base station of the target serving cell, and establish a connection with the target serving cell.
  • a message such as a radio resource control connection establishment, a radio resource control connection re-establishment, or a connection reconfiguration sent by the base station of the target serving cell, and establish a connection with the target serving cell.
  • the present embodiment provides a complete method for determining whether a cell has a radio link failure and performs corresponding processing after the cell radio link fails, so as to ensure that the user equipment can normally communicate when the cell radio link fails.
  • FIG. 6 is a schematic diagram of a user equipment according to Embodiment 6 of the present invention, where the user equipment can be used to detect whether a radio link failure occurs in a cell, including:
  • the carrier failure determining unit 61 is configured to determine that the current component carrier of the user equipment has a wireless link Failure
  • the user equipment checking unit 62 is configured to obtain the determination result of the carrier failure determining unit 61, and check whether there are other component carriers in the current cell that provide services for the user equipment;
  • the cell failure determining unit 63 is configured to determine that the current cell has a radio link failure when the check result of the user equipment checking unit 62 is NO.
  • the user equipment if the user equipment needs to determine whether the current cell has other component carriers that provide services, it may be determined whether the user equipment and the current cell have failed to connect to the wireless link, and the determining method is simple and easy to implement. Further, the user equipment further includes: a carrier failure notification unit, configured to send a notification to the serving node in the current cell when the user equipment checking unit 62 checks that there are other component carriers that have failed to generate a radio link Signaling, to notify the serving node that the current component carrier has a radio link failure.
  • a carrier failure notification unit configured to send a notification to the serving node in the current cell when the user equipment checking unit 62 checks that there are other component carriers that have failed to generate a radio link Signaling, to notify the serving node that the current component carrier has a radio link failure.
  • FIG. 7 is a schematic diagram of a user equipment according to Embodiment 7 of the present invention.
  • the user equipment may perform corresponding processing when a radio link fails in a cell, including:
  • the cell failure determining unit 71 is configured to determine that a radio link failure occurs in the current cell, and check whether other cells exist to provide services for the user equipment.
  • the cell change instructing unit 72 is configured to obtain a check result of the cell failure determining unit 71, and when there is at least one other cell serving the user equipment, and the current cell is a serving cell of the user equipment, indicating another The cell is changed to a serving cell of the user equipment.
  • the user equipment in this embodiment can ensure normal communication by changing the serving cell after the radio link fails in the current cell.
  • the user equipment may further include: a cell failure notification unit, configured to acquire a check result of the cell failure determining unit 71, where at least one other cell provides a service for the user equipment, and the current cell is the When the secondary cell of the user equipment is notified, the current cell of the serving cell of the user equipment is notified that the radio link fails.
  • the user equipment may further include: a connection attempting unit, configured to acquire a check result of the cell failure determining unit 71, and when there is no other cell providing service for the user equipment, attempt to resume connection with the current cell.
  • the user equipment in Embodiment 7 may include all or a part of the user equipment in Embodiment 6 to implement detection and processing of a cell infinite link failure.
  • FIG. 8 is a schematic diagram of a user equipment according to Embodiment 8 of the present invention, where the user equipment may indicate that its secondary cell is changed to its serving cell, including:
  • a target cell determining unit 81 configured to use a secondary cell of the user equipment as a target serving cell
  • An allocation requesting unit 82 configured to send an uplink resource allocation request message to the base station
  • the connection establishing unit 83 is configured to receive a connection establishment message sent by the base station, and establish a connection with the target serving cell.
  • the serving cell of the user equipment is changed, and the service cell replacement requirement of the user equipment is met.
  • the cell determining unit 81, the allocation requesting unit 82, and the connection establishing unit 83 in this embodiment may be located in the cell change instructing unit 72 of the seventh embodiment, thereby implementing the change of the serving cell.
  • FIG. 9 is a schematic diagram of a user equipment according to Embodiment 9 of the present invention, where the user equipment is used for detecting a carrier radio link failure, including:
  • the timing initiation unit 91 is configured to start timing when a hybrid automatic repeat request fails on the carrier;
  • the number statistics unit 92 is configured to: after the timing time of the timing initiation unit 91 arrives, the number of times the hybrid automatic repeat request fails in the carrier during the statistical time period;
  • the failure judging unit 93 is configured to determine that the carrier fails to generate a radio link when the number of statistics reaches a predetermined threshold.
  • the user equipment in this embodiment can detect whether a radio link fails on a carrier, and all the foregoing units can be implemented only in the MAC layer, and do not need to perform cross-layer detection to implement a single ticket; of course, the user equipment can also utilize the MAC layer and the RRC.
  • the layer performs the detection together, and the timing initiation unit 91, the number of statistics unit 92, and the failure determination unit 93 may all be located at the RRC layer, or some of the three units may have a single The element is located at the RRC layer.
  • the timing initiation unit 91 may receive a hybrid automatic repeat request failure message reported by the MAC layer to trigger timing.
  • the user equipment may further include: a timing termination unit, configured to notify a timing if a hybrid automatic repeat request is successful on the carrier or enters a discontinuous reception state on the carrier before the timing time arrives
  • the initiating unit 91 terminates the timing.
  • the timing initiation unit 91, the number of times statistics unit 92, and the failure determination unit 93 may be located in the carrier failure determining unit 61 described in the sixth embodiment to implement detection of a carrier radio link failure.
  • the user equipment may further include: a carrier updating unit, configured to determine, after the failure determining unit 93 determines that the carrier has a radio link failure, determine whether a carrier that fails the radio link is a primary carrier, and if yes, The other carrier that failed the radio link failure is changed to the primary carrier.
  • a carrier updating unit configured to determine, after the failure determining unit 93 determines that the carrier has a radio link failure, determine whether a carrier that fails the radio link is a primary carrier, and if yes, The other carrier that failed the radio link failure is changed to the primary carrier.
  • the cells when there are multiple cells providing monthly service for the user equipment, the cells may form a coordinated transmission cell group of the user equipment.
  • 10 is a schematic diagram of a method for determining a cell in which a radio link failure occurs according to Embodiment 10 of the present invention. The method may be based on the following application scenarios: a coordinated transmission cell group composed of multiple cells provides services for user equipment, and A radio link fails in one or more cells in the coordinated transmission cell group, and how the user equipment determines which cell or cells the current cell in which the radio link failure occurs is.
  • the method includes:
  • S102 Receive feedback information of the base station, and determine, by using the feedback information of the base station, which cell or cells in the coordinated transmission cell group the current cell in which the radio link failure occurs.
  • the user equipment may determine that the current cell has failed to generate a radio link by using the method in Embodiment 1, but because the current cell is transparent to the user equipment, the user equipment does not know that the current cell in which the radio link fails is Cooperating to transmit which cell or cells in the cell group, the user equipment can send information to the base station, and the base station determines which cell or cells in the coordinated transmission cell group the current cell in which the radio link failure occurs, and notifies the judgment result. User equipment, so that it can be known that there is no Which current cell is the line link failed.
  • the base station in this embodiment is a base station serving a user equipment in a coordinated transmission cell group, and may be a base station of a current cell in which a radio link fails. For example, when there are two cells serving the user equipment and two cells use one base station, even if one of the cells fails to reach the radio link, the user equipment may notify the base station of the failure result by using resources of another cell. .
  • the user equipment can be aware of which cell or cells in the coordinated transmission cell group the current cell in which the radio link failure has occurred.
  • FIG. 11 is a schematic diagram of a user equipment 110 according to Embodiment 11 of the present invention.
  • the user equipment 110 includes:
  • the information sending unit 111 is configured to: after determining that the current cell has a radio link failure, if the current cell is transparent to the user equipment, send the radio link failure information of the current cell to the base station; and the information receiving unit 112 is configured to receive The feedback information of the base station determines, by the feedback information of the base station, which cell or cells in the coordinated transmission cell group the current cell in which the radio link failure occurs.
  • the user equipment 110 in this embodiment has the ability to know from the base station which current non-transparent cell in which the radio link failure occurs is which cell in the coordinated transmission cell group.
  • the storage medium may be a magnetic disk, an optical disk, or a read-only memory (ROM). Or random access memory (RAM), etc.

Description

小区无线链路失败处理方法和用户设备 技术领域
本发明涉及通信技术领域，特别涉及一种小区无线链路失败处理方法和用 户设备。
背景技术
为了满足 IMT-Advanced (高级国际移动通信） 的要求， 支持高达 1GHz 的峰值数据速率， 3GPP LTE- ADVANCED (长期演进的演进版 )系统目前已经 同意将载波汇聚技术作为其扩展系统带宽的方法。载波汇聚技术主要是将多个 组成载波汇聚成一个高于 20MHz的载波， 以支持高速数据传输。
3GPP LTE- ADVANCED系统正在研究另一项技术是 CoMP ( Coordinated multi-point, 多点协作传输）技术。 该 CoMP技术现在有两种基本的模式： CS ( Coordinated scheduling and/or beamforming , 协作传输)模式与 JP ( Joint processing/transmission, 共同传输）模式。 在 CS模式下， 数据是从一个传输 点传输到一个 UE ( User Equipment, 用户设备 ); 在 JP模式下， 数据是从多个 传输点同时传输到一个 UE。 无论处于 CoMP的那种模式， CoMP set (多点协 作传输集）内的多个小区是需要保持同步的。在 CoMP场景下， 用户设备的服 务小区有可能发生无线链路失败，导致用户设备无法正常工作， 如何在服务小 区发生无线链路失败时保证用户设备的工作就成为一个问题。
发明内容
本发明实施例提供一种小区无线链路失败处理方法和用户设备，以在服务 小区出现无线链路失败时，实现服务小区的切换，以保证用户设备的正常工作。
本发明实施例提供一种小区无线链路失败处理方法， 包括：
确定当前小区出现无线链路失败，检查是否存在其它小区为用户设备提供 服务；
当存在至少一个其它小区为用户设备提供服务、且所述当前小区为用户设 备的服务小区时， 指示一个其它小区变更为所述用户设备的服务小区。
本发明实施例还提供一种用户设备， 包括：
小区失败确定单元， 用于确定当前小区出现无线链路失败， 并检查是否存 在其它小区为所述用户设备提供服务；
小区变更指示单元， 用于获取所述小区失败确定单元的检查结果， 当存在 至少一个其它小区为所述用户设备提供服务、且所述当前小区为所述用户设备 的服务小区时， 指示一个其它小区变更为所述用户设备的服务小区。
由上述方案可知，本发明实施例可在发现用户设备的服务小区出现无线链 路失败时，指示其它为正在为所述用户设备提供服务的小区变更为服务小区以 实现服务小区功能， 保证用户设备的正常通信。
本发明实施例还提供一种载波无线链路失败检测方法， 包括：
当载波上出现混合自动重传请求失败时， 开始计时；
在计时时间到达后，统计计时时间段内所述载波出现混合自动重传请求失 败的次数；
当所统计次数达到预定门限时， 确定所述载波发生无线链路失败。
本发明实施例还提供一种用户设备， 包括：
计时发起单元， 用于当载波上出现混合自动重传请求失败时， 开始计时； 次数统计单元， 用于在所述计时发起单元的计时时间到达后， 统计计时时 间段内所述载波出现混合自动重传请求失败的次数；
失败判断单元， 用于当所统计次数达到预定门限时， 确定所述载波发生无 线链路失败。
由上述方案可知，本发明实施例只需要统计一段时间内载波出现混合自动 重传请求失败的次数， 并与预定门限比较，便可检测出载波是否出现无线链路 失败， 实现筒单<
附图说明
图 1为本发明实施例一提供的一种小区无线链路失败检测方法的示意图； 图 2为本发明实施例二提供的一种小区无线链路失败处理方法的示意图； 图 3为本发明实施例三提供的一种服务小区变更方法的示意图； 图 4为本发明实施例四提供的一种载波无线链路失败检测方法的示意图； 图 5 为本发明实施例五提供的一种小区无线链路失败检测与处理方法的 示意图；
图 6为本发明实施例六提供的一种用户设备的示意图；
图 7为本发明实施例七提供的一种用户设备的示意图；
图 8为本发明实施例八提供的一种用户设备的示意图；
图 9为本发明实施例九提供的一种用户设备的示意图；
图 10为本发明实施例十提供的一种确定出现无线链路失败的小区的方法 的示意图；
图 11为本发明实施例十一提供的一种用户设备的示意图。
具体实施方式
下面将结合附图， 对本发明的实施方案进行详细描述。 需要说明的是， 以 下实施例仅仅是本发明一部分实施例， 而不是全部的实施例。基于本发明实施 例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施 例， 都属于本发明保护的范围。
一种现有技术中提供的无线链路失败检测方案只适用于单载波场景，也就 是说， 该现有技术仅仅检测出一个组成载波是否出现无线链路失败， 而没有给 出如何检测支持多载波的小区是否出现无线链路失败的解决方案。图 1为本发 明实施例一提供的一种小区无线链路失败检测方法的示意图， 该方法包括： Sll : 确定用户设备的当前组成载波出现无线链路失败；
S12:检查当前小区内是否存在其它为所述用户设备提供服务的组成载波； S13: 当所述当前小区内不存在其它为所述用户设备提供服务的组成载波 时， 判定所述当前小区出现无线链路失败。
本实施例判断当前用户设备的小区内是否存在其它组成载波服务于用户 设备， 以判断所述小区是否发生无线链路的连接失败， 判断方法筒单且易于实 现。 可以理解， 所述当前小区是为所述用户设备提供服务的小区； 所述当前组 成载波和其它为所述用户设备提供服务的组成载波，是当前小区为所述用户设 备配置的组成载波， 这些组成载波用于为该用户设备提供服务； 所述无线链路 失败可包括上行无线链路失败和 /或下行无线链路失败。 当前小区出现无线链 路失败后将无法正常为用户设备提供服务。可以理解， 用户设备的当前小区可 以有多个， 这些当前小区可互相协作为用户设备提供服务，从而构成协作传输 小区组，此时当前组成载波也就是所述协作传输小区组为当前用户设备配置的 组成载波。
对于如何确定用户设备的当前组成载波出现无线链路失败，可以有多种方 法。 在一种具体应用中， 所述当前组成载波为下行组成载波。 用户设备的物理 层检测到当前下行组成载波出现失步 （ out-of-sync ) , 并向用户设备的 RRC(Radio Resource Control无线资源控制)层上报第一指示消息， 以指示该下 行组成载波出现失步。 相应地， 所述 RRC层接收所述第一指示消息， 并启动 一定时器 T310, 如果所述 RRC层在定时器 T310的定时时间内收到所述物理 层的一个同步（in-sync )消息， 则停止所述定时器 T310; 如果所述 RRC层在 定时器 T310的定时时间内一直收到第一指示消息， 则认为所述下行组成载波 发生下行无线链路失败。 可以理解， 对于 RRC层如何检测当前下行组成载波 是否发生下行无线链路失败，现有技术中还存在其它方法， 本实施例对此不做 限定。 在另一种具体应用中， 所述当前组成载波为上行组成载波。 用户设备的 MAC ( Media Access Control, 媒体访问控制）层可在当前上行组成载波上出 现随机接入失败时， 向用户设备的 RRC层上报第二指示消息， 以指示当前上 行组成载波出现随机接入失败。 相应地， 所述 RRC层接收第二指示信息， 如 果此时所述 RRC层没有进行连接建立、 连接重建立或连接重配置， 则认为该 上行组成载波出现上行无线链路失败。 具体地， 所述 RRC层在收到第二指示 信息后可检查定时器 T300、 T301、 T304、 T311 是否启动， 如果上述定时器 T300、 T301、 T304、 T311都没有启动， 则表明所述 RRC层没有进行连接建 立、 连接重建立或连接重配置， 该上行组成载波出现上行无线链路失败。 可以 理解，检测确定当前上行组成载波是否出现无线链路失败还存在其它方法， 例 如， 用户设备的 RLC ( Radio Link Control, 无线链路控制 )层可在该当前上行 组成载波上达到最大的重传次数时向用户设备的 RRC层发送第三指示消息， 以指示当前上行组成载波出现重传失败，所述 RRC层接收所述第三指示消息， 并认为该上行组成载波出现上行无线链路失败。 再例如， 所述 RLC层在达到 最大的重传次数时向所述 RRC层发送第三指示消息， 指示出现重传失败， 但 是可能无法具体指定是哪一个组成载波发生了重传失败， 此时所述 RRC层收 到所述第三指示消息， 可以认为整个无线连接发生了无线链路失败。
对于其它检测一组成载波是否出现无线链路失败的方法，本实施例不再一 一列举。
进一步地， 所述方法还可包括： 当所述用户设备存在其它未发生无线链路 失败的组成载波时， 向所述当前小区内服务节点发送一通知信令， 以通知所述 服务节点所述当前组成载波出现无线链路失败。可以理解， 为用户设备提供服 务的当前小区可以有多个， 从而构成小区组。 具体地， 所述服务节点可以为基 站（eNodeB )或中继节点（Relay Node, RN )。 所述发送通知信令可以通过所 述其它未发生无线链路失败的组成载波中的某一个来实现。 图 2为本发明实施例二提供的一种小区无线链路失败处理方法的示意图， 该方法包括：
S21 : 确定当前小区出现无线链路失败， 检查是否存在其它小区为当前用 户设备提供服务；
S22: 当存在至少一个其它小区为当前用户设备提供服务、 且所述当前小 区为当前用户设备的服务小区时，指示一其它小区变更为当前用户设备的服务 小区。
可以理解， 在 CoMP技术中， 为用户设备提供服务的小区包括 2种： 服务 小区 ( Serving Cell )和辅助小区 ( Assist Cell )。 服务小区和辅助小区虽然都为 用户设备提供服务，但辅助小区起到的是辅助服务功能。 一个用户设备可以同 时有多个小区为其提供服务， 其中服务小区只能有一个， 而辅助小区却可以有 多个。在本实施例中，如果所述当前小区是当前用户设备的服务小区且该当前 小区出现无线链路失败，则当前用户设备可指示其它为正在为所述用户设备提 供服务的一个辅助小区变更为服务小区，以使得便更后的小区实现服务小区功 能，保证用户设备的正常通信。本实施例所述的方法适用于单载波小区与多载 波小区。本领域技术人员可以理解， 实施例二所述小区无线链路失败处理方法 也可与实施例一所述小区无线链路失败检测方法相结合，当检测到小区无线链 路失败， 则可继续利用实施例二所述方法进行处理。 至于用户设备有几个为其 提供服务的小区，以及这些小区中的哪个是所述用户设备的服务小区都可以是 预先配置好的。 当然， 在本实施例中， 如何确定当前小区出现无线链路失败也 可以不通过检测的方法，而可以通过接收基站或其它节点的通知消息获知当前 小区出现无线链路失败。
可以理解， 当只存在一个其它小区为当前用户设备提供服务、且所述当前 小区为当前用户设备的服务小区时，可指示该其它小区变更为当前用户设备的 服务小区。 当存在至少 2个其它小区为当前用户设备提供服务、且所述当前小 区为当前用户设备的服务小区时， 可在所述至少 2个其它小区中选择一小区， 指示所选小区变更为当前用户设备的服务小区。优选地， 可在所述至少 2个其 它小区中选择服务质量最好的小区，并指示所选小区变更为当前用户设备的服 务小区， 这样可保证用户设备得到好的服务质量。 可以理解， 指示一个小区变 更为当前用户设备的服务小区也就是指示该小区的基站进行所述小区变更。
进一步地， 该方法还可包括： 当存在至少一个其它小区为当前用户设备提 供服务、且所述当前小区为当前用户设备的辅助小区时， 则通知当前用户设备 的服务小区所述当前小区出现无线链路失败。如果出现无线链路失败的小区为 当前用户设备的辅助小区，则所述至少一个其它小区中必然存在当前用户设备 的服务小区，当前用户设备可将当前辅助小区无线链路失败的消息通知其服务 小区， 以便其服务小区进行处理。 可选地， 当前用户设备也可将当前辅助小区 无线链路失败的消息通知其它辅助小区。具体地，在当前用户设备将当前辅助 小区无线链路失败的消息通知其服务小区时， 通知所采用的消息可是新定义 的， 也可在现有消息中增加一些字段作为通知消息以指示发生无线链路失败。
进一步地， 所述方法还可包括： 当不存在其它小区为当前用户设备提供服 务时， 尝试与所述当前小区恢复连接。
图 3为本发明实施例三提供的一种服务小区变更方法的示意图，该方法包 括：
S31 : 将当前用户设备的一辅助小区作为目标服务小区；
S32: 向当前用户设备的基站发送上行资源分配请求消息；
S33:接收所述基站发送的连接建立消息，与所述目标服务小区建立连接。 在本实施例中， 用户设备可选择与辅助小区建立连接， 在连接建立后， 原 辅助小区将成为用户设备的服务小区， 完成服务小区变更， 该方法可适用于单 载波小区与多载波小区。特别是当用户设备发现其服务小区出现无线链路失败 时， 可进行相应的服务小区变更， 使用户设备的一辅助小区变更为服务小区， 以保证用户设备的正常通信。可以理解，相应小区变更可不仅应用在出现无线 链路失败时， 还可应用于其它需要进行服务小区变更的场景。 在本实施例中， 所述连接建立消息包括但不限于无线资源控制连接建立消息、无线资源控制连 接重建立消息、无线资源控制连接重配置消息等用于用户设备与小区建立连接 的消息， 相应消息被提供给当前用户设备的基站， 然后， 由所述基站向用户设 备发送连接建立消息， 以指示用户设备可以与目标服务小区建立连接。
进一步地， 所述将当前用户设备的一辅助小区作为目标服务小区可包括： 当所述当前用户设备有多个辅助小区时，从所述多个辅助小区中选择一辅助小 区作为目标服务小区。在一种具体应用中，选择目标服务小区的标准可以是小 区的质量。也就是说， 用户设备可从多个辅助小区内选择服务质量最好的小区 作为目标服务小区， 保证获得好的通信质量。
在一种具体实现中，向所述目标服务小区的基站发送的上行资源分配请求 消息为一前导信号，发送所述前导信号后， 用户设备可接收目标服务小区的基 站发送的定时调整命令 ( TA )和上行授权（ Grant ), 并向目标服务小区的基站 发起连接请求。所述向目标服务小区的基站发起连接请求可以是向目标服务小 区的基站发送无线资源控制连接重建立请求 ( RRC Connection Reestablishment Request ) 消息， 这里也可以发送其他消息来代替， 如发送无线资源控制连接 请求（ RRC Connection Request ) 消息、 或者发送无线资源控制重配置（ RRC Connection Reconfiguration ) 消息等。 发送的所述消息中也可包含需要连接重 建立、 重配置等的原因， 如服务小区出现无线链路失败等必要信息。
在另一种具体实现中，所述向所述目标服务小区的基站发送上行资源分配 请求消息可进一步包括： 向所述目标服务小区的基站发送专用前导信号， 所述 专用前导信号用于向目标服务小区指示当前用户设备需要变更服务小区。所述 专用前导信号可以是预先设定的，使用户设备和基站双方都能得知该专用前导 信号的作用。用户设备可在其服务小区出现无线链路失败时发送该专用前导信 号，目标服务小区的基站收到该信号就能知道用户设备在其当前小区已出现无 线链路失败， 目标服务小区的基站如果同意进行服务小区变更，则可发送 RRC Connection Reestablishment或 RRC Connection Reconfiguration等消息给该用户 设备， 使得用户设备能够完成与目标服务小区的连接建立。
在另一种具体应用中，如果为用户设备提供服务的所有小区都为用户设备 预留了相同的 PUCCH ( physical uplink control channel, 物理上行控制信道 ) 资源， 则向所述目标服务小区的基站发送的上行资源分配请求消息可以为一 PUCCH SR ( Scheduling Request, 调度请求）。 相应小区在接收到 PUCCH SR 后， 能够得知哪个用户设备发送了这一请求，从而进一步指示用户设备进行连 接重建立。
本发明实施例还提供了一种新的无线链路失败检测方法，可方便地检测出 载波是否出现无线链路失败。图 4为本发明实施例四提供的一种载波无线链路 失败检测方法的示意图， 该方法包括：
S41 : 当载波上出现混合自动重传请求 ( HARQ, Hybrid Automatic Repeat Request ) 失败时， 开始计时；
S42: 在计时时间到达后， 统计计时时间段内所述载波出现混合自动重传 请求失败的次数；
S43: 当所统计次数达到预定门限时， 确定所述载波发生无线链路失败。 本实施例提供了一种在检测载波是否出现无线链路失败的新方法，所述方 法可以在 MAC层进行， 由 MAC层统计载波上出现混合自动重传请求失败次 数以判断载波该载波是否发生无线链路失败， 无需进行跨层检测， 实现筒单。 进一步地， 当 MAC层检测到一载波发生无线链路失败后， 可将检测结果通知 RRC层， 由 RRC层计时并统计所述失败次数， 判断所述载波是否出现无线链 路失败。 本实施例可应用于载波的上行无线链路失败的检测。
进一步地， 该方法还可包括： 在定时时间到达前， 如果在所述载波上出现 混合自动重传请求成功或在所述载波上进入非连续接收（DRX, Discontinuous Reception )状态， 则终止计时。
上述载波无线链路失败检测方法适用于单载波或多载波的情况。对于多载 波情况， 当确定某一载波发生无线链路失败之后， 需要判断所述发生无线链路 失败的载波是否为主（Anchor )载波， 如果所述发生无线链路失败的载波为当 前用户设备的 Anchor载波， 则需要更新 Anchor载波， 即将其它一未出现无线 链路失败的载波变更为 Anchor载波。 具体地， 将哪个未出现无线链路失败的 载波做为新 Anchor载波可以由用户设备自行确定， 在更新完成后， 用户设备 可将更新结果通知基站。 用户设备也可将变更 Anchor载波的需求通知基站， 然后由基站确定新的 Anchor载波， 并将确定结果通知用户设备。
本实施例所述的方法可应用于多载波的场景。当一个用户设备存在多个服 务载波时， 可以在用户设备的 MAC层为每个载波设置一定时器以统计该载波 上的 HARQ失败次数。 当 MAC层发现某个载波上发生 HARQ失败的时候，检查 该载波对应的定时器 T是否启动， 如果所述定时器 T还没有启动则启动所述定 时器 T,并开始记录该载波上的 HARQ失败次数； 如果所述定时器 T已经启动则 将该载波的 HARQ失败次数加 1。当 MAC层发现某个载波上 HARQ成功的时候， 检查相应定时器 T是否启动，如果所述定时器 T已经启动则停止所述定时器 T的 计时， 并将记录的 HARQ失败次数归 0。 当 MAC层发现在某一载波上进入 DRX 状态， 检查该载波对应的定时器 T是否启动， 如果所述定时器 T启动则停止该 定时器 T的计时， 并且将记录的 HARQ失败次数归 0。 当 MAC层发现一个定时 器 T超时，检查该定时器 T已记录的对应载波的 HARQ失败次数，如果所述失败 次数达到预定的次数门限， 则认为该载波发生无线链路失败； 如果所述失败次 数未达到预定的次数门限， 则将记录的相应载波的 HARQ失败次数归 0。 这里 的次数门限可以由网络进行配置， 例如网络可以在系统消息中携带所述配置， 可以在具体的连接建立、 重配置、 重建立等消息中携带所述配置， 使用户设备 能根据所述消息得知网络的配置情况。
进一步地， MAC层还可以只检测每个载波上单次的 HARQ失败或成功，一 旦某个载波上发生了 HARQ失败， 则把具体的载波及其 HARQ失败信息发送给 RRC层， 由 RRC层进行上行无线链路失败的检测与统计。 RRC层一旦接收到某 个载波发生了上行无线链路失败的指示之后可立即启动定时器 T并对 HARQ失 败的次数进行记录。 在定时器启动期间， 一旦 MAC层在某一个载波上 HARQ 成功， 或者 MAC层在该载波上进入 DRX状态， 则立即指示 RRC层可以停止定 时器 T。 而一旦定时器 Τ超时， 则 RRC层可判断计数器是否达到预定门限， 如 果达到预定门限则认为该计数器对应的载波发生了上行无线链路失败，否则关 闭定时器并将计数器归零。不同于之前的 MAC层检测方法，该方法可通过 MAC 层与 RRC层的共同检测得到载波是否发生上行无线链路失败。
可以理解， 上述方法实施例可通过互相结合实现载波无线链路失败检测、 小区无线链路失败检测、小区无线链路失败处理和服务小区变更等一系列完整 功能。 图 5为本发明实施例五提供的一种小区无线链路失败检测与处理方法的 示意图， 该方法包括：
S51： 通过检测确定一当前组成载波出现无线链路失败。
检测某一当前组成载波是否出现无线链路失败有多种方法，可通过实施例 一中描述的方法。 使用户设备的物理层向 RRC层报告一指示消息， 指示当前 组成载波出现无线链路异常， RRC 层接收指示后， 可进一步判定当前组成载 波是否出现无线链路失败， 判定方法不再赘述。 也可仅采用实施例四所述的 MAC层载波无线链路失败检测方法进行检测， 在一组成载波出现混合自动重 传请求失败时， 开始计时， 统计计时时间内该组成载波出现的混合自动重传请 求失败次数，通过比较所述次数与预定门限，确定组成载波是否发生无线链路 失败。
S52: 检查当前用户设备是否存在其它组成载波， 如果是， 则执行 S53; 如果否， 则执行 S54。 当前用户设备存在多少组成载波通常是系统配置好的。 S53: 向该当前小区内服务节点发送一通知信令， 以通知所述服务节点所 述当前组成载波出现无线链路失败。如果所述发生无线链路失败的载波为当前 用户设备的 Anchor载波， 则需要通知基站变更 Anchor载波， 即将 Anchor载 波变更为其它未出现无线链路失败的载波。
S54: 检查除当前小区外， 是否存在其它小区为当前用户设备提供服务， 如果否， 执行 S55; 如果是， 执行 S56。
S55: 尝试与所述当前小区恢复连接。
S56: 判断当前小区是否是当前用户设备的服务小区， 如果否， 执行 S57; 如果是， 执行 S58。
S57: 通知其它小区中当前用户设备的服务小区所述当前小区出现无线链 路失败。
S58: 将一个其它小区作为目标服务小区。 具体地， 当存在多个其它小区 也在为用户设备提供服务时，可在多个其它小区中选择服务质量最好的小区作 为目标服务小区， 当然，选择辅助小区的方法可以有其它方式，此处不再展开。
S59: 向所述目标服务小区的基站发送上行资源分配请求消息。
S510:接收所述目标服务小区的基站发送的无线资源控制连接建立、无线 资源控制连接重建立、 或连接重配置等消息， 与所述目标服务小区建立连接。
本实施例提供了完整的判断小区是否出现无线链路失败，并在小区无线链 路失败后进行相应处理的方法，保证用户设备在发生小区无线链路失败能够正 常通信。本实施例中一些步骤仅仅是概括描述， 具体过程可参见之前的其它实 施例。
图 6为本发明实施例六提供的一种用户设备的示意图，该用户设备可用于 检测其小区是否出现无线链路失败， 包括：
载波失败确定单元 61 , 用于确定用户设备的当前组成载波出现无线链路 失败；
用户设备检查单元 62, 用于获取载波失败确定单元 61的确定结果， 并检 查当前小区内是否存在其它为所述用户设备提供服务的组成载波；
小区失败判断单元 63 , 用于当所述用户设备检查单元 62的检查结果为否 时， 判定所述当前小区出现无线链路失败。
在本实施例中，如果用户设备需要判断当前小区是否存在其它提供服务的 组成载波， 可以判断所述用户设备与当前小区是否发生无线链路的连接失败， 判断方法筒单且易于实现。 进一步地， 所述用户设备还包括： 载波失败通知单 元， 用于当所述用户设备检查单元 62检查发现存在其它未发生无线链路失败 的组成载波时， 向该当前小区内服务节点发送一通知信令， 以通知所述服务节 点所述当前组成载波出现无线链路失败。
图 7为本发明实施例七提供的一种用户设备的示意图，该用户设备可在其 小区出现无线链路失败时进行相应处理， 包括：
小区失败确定单元 71 , 用于确定当前小区出现无线链路失败， 并检查是 否存在其它小区为所述用户设备提供服务；
小区变更指示单元 72, 用于获取小区失败确定单元 71的检查结果， 当存 在至少一个其它小区为所述用户设备提供服务、且所述当前小区为所述用户设 备的服务小区时， 指示一个其它小区变更为所述用户设备的服务小区。
本实施例的用户设备在当前小区出现无线链路失败后可通过变更服务小 区保证正常通信。 进一步地， 所述用户设备还可包括： 小区失败通知单元， 用 于获取小区失败确定单元 71的检查结果， 当存在至少一个其它小区为所述用 户设备提供服务、且所述当前小区为所述用户设备的辅助小区时， 则通知所述 用户设备的服务小区所述当前小区出现无线链路失败。进一步地， 所述用户设 备还可包括： 连接尝试单元， 用于获取小区失败确定单元 71的检查结果， 当 不存在其它小区为所述用户设备提供服务时， 尝试与所述当前小区恢复连接。 可以理解，实施例七所述用户设备可包含实施例六中用户设备的全部或部分单 元， 以实现小区无限链路失败的检测与处理。
图 8为本发明实施例八提供的一种用户设备的示意图，该用户设备可指示 其辅助小区变更为其服务小区， 包括：
目标小区确定单元 81 , 用于将所述用户设备的一辅助小区作为目标服务 小区；
分配请求单元 82, 用于向基站发送上行资源分配请求消息；
连接建立单元 83 , 用于接收所述基站发送的连接建立消息， 与所述目标 服务小区建立连接。
本实施例可实现用户设备的服务小区变更，满足用户设备的服务小区更换 需求。 可以理解， 本实施例中的小区确定单元 81、 分配请求单元 82和连接建 立单元 83可位于实施例七的小区变更指示单元 72内，从而实现服务小区的变 更。
图 9为本发明实施例九提供的一种用户设备的示意图，该用户设备可用于 载波无线链路失败的检测， 包括：
计时发起单元 91 , 用于当载波上出现混合自动重传请求失败时， 开始计 时；
次数统计单元 92, 用于在计时发起单元 91的计时时间到达后， 统计计时 时间段内所述载波出现混合自动重传请求失败的次数；
失败判断单元 93 , 用于当所统计次数达到预定门限时， 确定所述载波发 生无线链路失败。
本实施例的用户设备可检测一载波上是否出现无线链路失败，上述所有单 元均可仅在 MAC层实现， 无需跨层检测， 实现筒单； 当然， 用户设备也可利 用 MAC层和与 RRC层进行共同完成检测， 此时计时发起单元 91、 次数统计 单元 92和失败判断单元 93可都位于 RRC层， 或者该 3个单元中可有部分单 元位于 RRC层。 当所述 3个单元都位于 RRC层时， 所述计时发起单元 91可 接收 MAC层上报的混合自动重传请求失败消息， 以触发计时。 进一步地， 所 述用户设备还可包括： 计时终止单元， 用于在定时时间到达前， 如果所述载波 上出现混合自动重传请求成功或在所述载波上进入非连续接收状态，则通知计 时发起单元 91终止计时。 本实施例中计时发起单元 91、 次数统计单元 92和 失败判断单元 93可位于实施例六所述的载波失败确定单元 61内，实现对载波 无线链路失败的检测。 进一步地， 所述用户设备还可包括： 载波更新单元， 用 于在失败判断单元 93确定所述载波发生无线链路失败之后， 判断发生无线链 路失败的载波是否为主载波，如果是， 则将其它一未出现无线链路失败的载波 变更为主载波。
如实施例一所述， 当为用户设备提供月良务的小区有多个时， 这些小区可构 成所述用户设备的协作传输小区组。 图 10为本发明实施例十提供的一种确定 出现无线链路失败的小区的方法的示意图， 该方法可基于以下应用场景： 由多 个小区组成的协作传输小区组为用户设备提供服务， 且协作传输小区组中的 1 个或多个小区出现无线链路失败，用户设备如何确定出现无线链路失败的当前 小区是哪个或哪些小区。 所述方法包括：
S101 : 在确定当前小区出现无线链路失败后，如果当前小区对用户设备是 透明的， 向基站发送所述当前小区的无线链路失败信息；
S102:接收基站的反馈信息，通过基站的所述反馈信息确定发生无线链路 失败的当前小区是协作传输小区组内的哪个或哪些小区。
在本实施例中，用户设备可通过实施例一所述方法判断其当前小区出现无 线链路失败，但由于当前小区对用户设备是透明的， 用户设备不知道出现无线 链路失败的当前小区是协作传输小区组内的哪个或哪些小区，此时用户设备可 向基站发送信息，由基站判断出现无线链路失败的当前小区是协作传输小区组 内的哪个或哪些小区， 并将判断结果通知所述用户设备，使得能够得知出现无 线链路失败的当前小区是哪个。本实施例所述基站是协作传输小区组内为用户 设备提供服务的基站， 可以是出现无线链路失败的当前小区的基站。 例如， 当 有 2个小区为用户设备提供服务，且 2个小区使用一个基站， 则即便其中一个 小区出现无线链路失败，用户设备可利用另一小区的资源将所述失败结果通知 所述基站。
如果用户设备的协作传输小区组对用户设备是非透明的，则用户设备能够 意识到发生了无线链路失败的当前小区是协作传输小区组中的哪个或哪些小 区。
图 11为本发明实施例十一提供的一种用户设备 110的示意图， 所述用户 设备 110包括：
信息发送单元 111 , 用于在确定当前小区出现无线链路失败后， 如果当前 小区对用户设备是透明的， 向基站发送所述当前小区的无线链路失败信息； 信息接收单元 112, 用于接收基站的反馈信息， 通过基站的所述反馈信息 确定发生无线链路失败的当前小区是协作传输小区组内的哪个或哪些小区。
本实施例中的用户设备 110 具有从基站处获知发生无线链路失败的当前 非透明小区是协作传输小区组内哪个小区的能力。
可以理解，上述各用户设备实施例中的单元可互相结合实现载波无线链路 失败检测、 小区无线链路失败检测、 小区无线链路失败处理和服务小区变更等 一系列完整功能， 本实施例对此不再赘述。凡是本领域技术人员能够从本发明 实施例的方法和设备中概括得到的技术方案都应被视为是本发明实施例的一 部分。
本领域普通技术人员可以理解上述方法实施例中的全部或部分流程，是可 以通过计算机程序来指令相关硬件完成的，所述的程序可存储于一计算机可读 取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中， 所述的存储介质可为磁碟、光盘、只读存储记忆体（ Read-Only Memory, ROM ) 或随机存储记忆体 ( Random Access Memory, RAM )等。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通 技术人员来说，在不脱离本发明原理的前提下， 上述实施例还可以做出若干改 进和变型， 这些改进和变型也应视为本发明的保护范围。

Claims

权 利 要 求
1、 一种小区无线链路失败处理方法， 其特征在于， 包括：
确定当前小区出现无线链路失败，检查是否存在其它小区为用户设备提供 服务；
当存在至少一个其它小区为用户设备提供服务、且所述当前小区为用户设 备的服务小区时， 指示一其它小区变更为所述用户设备的服务小区。
2、 根据权利要求 1所述的方法， 其特征在于， 还包括：
当存在至少一个其它小区为用户设备提供服务、且所述当前小区为用户设 备的辅助小区时， 则通知用户设备的服务小区所述当前小区出现无线链路失 败。
3、 根据权利要求 1所述的方法， 其特征在于， 所述确定当前小区出现无 线链路失败包括：
确定所述用户设备的当前组成载波出现无线链路失败；
检查当前小区内是否存在其它为所述用户设备提供服务的组成载波； 当所述当前小区内不存在其它为所述用户设备提供 务的组成载波时，判 定所述当前小区出现无线链路失败。
4、 根据权利要求 1所述的方法， 其特征在于， 还包括：
如果所述当前小区对所述用户设备是透明的，向用户设备的基站发送所述 当前小区的无线链路失败信息；
接收所述基站的反馈信息，通过所述反馈信息确定发生无线链路失败的当 前小区是用户设备的协作传输小区组内的哪个或哪些小区。
5、 根据权利要求 1 - 4中任一项所述的方法， 其特征在于， 所述指示一个 其它小区变更为所述用户设备的服务小区包括：
将一个其它小区作为目标服务小区；
向用户设备的基站发送上行资源分配请求消息； 接收所述基站发送的连接建立消息， 与所述目标服务小区建立连接。
6、 一种载波无线链路失败检测方法， 其特征在于， 包括：
当载波上出现混合自动重传请求失败时， 开始计时；
在计时时间到达后，统计计时时间段内所述载波出现混合自动重传请求失 败的次数；
当所统计次数达到预定门限时， 确定所述载波发生无线链路失败。
7、 根据权利要求 6所述的方法， 其特征在于， 对于多载波的情况， 所述 方法还包括：
判断所述载波是否为主载波， 如果是， 则将其它一未出现无线链路失败的 载波变更为主载波。
8、 一种用户设备， 其特征在于， 包括：
小区失败确定单元， 用于确定当前小区出现无线链路失败， 并检查是否存 在其它小区为所述用户设备提供服务；
小区变更指示单元， 用于获取所述小区失败确定单元的检查结果， 当存在 至少一个其它小区为所述用户设备提供服务、且所述当前小区为所述用户设备 的服务小区时， 指示一个其它小区变更为所述用户设备的服务小区。
9、 根据权利要求 8所述的用户设备， 其特征在于， 还包括：
小区失败通知单元， 用于获取所述小区失败确定单元的检查结果， 当存在 至少一个其它小区为所述用户设备提供服务、且所述当前小区为所述用户设备 的辅助小区时，则通知所述用户设备的服务小区所述当前小区出现无线链路失 败。
10、 根据权利要求 8所述的用户设备， 其特征在于， 所述小区失败确定单 元包括：
载波失败确定单元， 用于确定用户设备的当前组成载波出现无线链路失 败； 用户设备检查单元， 用于获取所述载波失败确定单元的确定结果， 并检查 当前小区内是否存在其它为所述用户设备提供服务的组成载波；
小区失败判断单元， 用于当所述用户设备检查单元的检查结果为否时， 判 定所述当前小区出现无线链路失败。
11、 根据权利要求 8所述的用户设备， 其特征在于， 还包括：
信息发送单元，用于在所述小区失败确定单元确定所述当前小区出现无线 链路失败后，如果所述当前小区对所述用户设备是透明的， 向基站发送所述当 前小区的无线链路失败信息；
信息接收单元， 用于接收所述基站的反馈信息， 通过所述基站的反馈信息 确定发生无线链路失败的当前小区是协作传输小区组内的哪个或哪些小区。
12、 根据权利要求 8 - 11中任一项所述的用户设备， 其特征在于， 所述小 区变更指示单元包括：
目标小区确定单元， 用于将一个其它小区作为目标服务小区；
分配请求单元， 用于向基站发送上行资源分配请求消息；
连接建立单元， 用于接收所述基站发送的连接建立消息， 与所述目标服务 小区建立连接。
13、 一种用户设备， 其特征在于， 包括：
计时发起单元， 用于当载波上出现混合自动重传请求失败时， 开始计时； 次数统计单元， 用于在所述计时发起单元的计时时间到达后， 统计计时时 间段内所述载波出现混合自动重传请求失败的次数；
失败判断单元， 用于当所统计次数达到预定门限时，确定所述载波发生无 线链路失败。
14、 根据权利要求 13所述的用户设备， 其特征在于， 还包括：
载波更新单元，用于在所述失败判断单元确定所述载波发生无线链路失败 之后， 判断发生无线链路失败的载波是否为主载波， 如果是， 则将其它一未出 现无线链路失败的载波变更为主载波。
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