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WO2007124677A1 - Procédé et dispositif pour commande de commutateur - Google Patents

Procédé et dispositif pour commande de commutateur Download PDF

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Publication number
WO2007124677A1
WO2007124677A1 PCT/CN2007/001309 CN2007001309W WO2007124677A1 WO 2007124677 A1 WO2007124677 A1 WO 2007124677A1 CN 2007001309 W CN2007001309 W CN 2007001309W WO 2007124677 A1 WO2007124677 A1 WO 2007124677A1
Authority
WO
WIPO (PCT)
Prior art keywords
time
handover
target cell
terminal
cell
Prior art date
Application number
PCT/CN2007/001309
Other languages
English (en)
Chinese (zh)
Inventor
Hao Wu
Liyan Yin
Original Assignee
Huawei Technologies Co., Ltd.
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
Priority claimed from CNB2006100745946A external-priority patent/CN100461961C/zh
Priority claimed from CNB2006100745113A external-priority patent/CN100490556C/zh
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007124677A1 publication Critical patent/WO2007124677A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a handover technique in a wireless communication system, and more particularly to a handover control method and apparatus.
  • Background technique
  • LTE Long Term Evolution of Technology
  • the goal of LTE is to develop a framework for wireless access technologies with features such as high data rates, low response times, and optimal packet access. Therefore, important parts of LTE include shorter response times, higher user data rates, greater system capacity and wider coverage, and reduced operator cost.
  • LTE handover The general process of LTE handover is described as follows: When the wireless condition changes, the terminal measures the neighboring cell, then sends a measurement report, the network makes a decision according to the measurement report, and notifies the target cell to prepare for handover, and then the network sends a handover command to the terminal. Instructing to switch to the target cell. At this time, the terminal disconnects from the source cell and starts to synchronize to the target cell. After the synchronization, the terminal notifies the network side of the handover confirmation, and starts to send and receive user data on the target cell, and finally the source cell. Release resources.
  • the terminal disconnects from the source cell and then synchronizes to the target cell before establishing connection with the target cell. Therefore, due to the process of disconnecting and then connecting, the terminal is interrupted when receiving or transmitting data.
  • the terminal uses the foregoing process to perform the handover. After the terminal receives the handover command, it needs to pass a certain handover delay.
  • the handover delay includes the processing delay of the network side of the 3GPP system, and the delay of waiting for the activation time to arrive.
  • a user data transfer block After obtaining synchronization with the target cell, the terminal starts to send and receive user data in the target cell.
  • the handover delay time is defined as: the time between the transmission time interval ( ⁇ ) of the last source cell containing the transport block and the start of transceiving user data on the target cell.
  • the time between when the terminal sends or receives the last complete SDU (Service Data Unit) on the source cell to transmit or receive the first complete upper SDU on the target cell is defined as the handover interruption time.
  • SDU Service Data Unit
  • the terminal performs the inter-frequency measurement in the compressed mode or the compressed mode, and the network side of the 3GPP system does not indicate that the terminal does not perform any synchronization process, and the process of completing the frame timing synchronization, the process of the physical channel synchronization, and the pair in the handover delay time
  • the process of re-confirming the target cell system timing information or/and the process of the unknown target cell search, and the synchronization of the transmission timing of the transport block in the target cell are known.
  • the terminal does not use the compressed mode for inter-frequency measurement when switching, and the 3GPP system network side does not indicate that the terminal does not perform any synchronization process, or the terminal uses the compressed mode for inter-frequency measurement when switching, and the 3GPP system network side instructs the terminal not to perform any synchronization process.
  • the process of re-confirming the system timing information re-confirmation of the known target cell or/and the unknown target cell search, and the synchronization of the transmission timing of the transport block in the target cell during the handover delay time.
  • the process of decoding the known target cell system timing information or/and the unknown target cell search, and the transmission timing synchronization of the transport block in the target cell are completed within the handover delay time.
  • the terminal When the terminal switches from the FDD cell to the time division duplex (TDD) cell, the terminal completes the process of frame synchronization, the process of waiting for the uplink access time slot to appear, and the re-confirmation of the known target cell system timing information. And a process of decoding a known target cell system timing information or an unknown cell search, and a transmission timing of a transport block in the target cell.
  • TDD time division duplex
  • the network side of the 3GPP system determines the handover delay time according to the different handover procedures of the terminal.
  • the terminal receives the handover command, it performs timing, and determines whether the terminal starts to send and receive user data in the target cell within the determined handover delay time. If yes, the terminal The switch is successful. Otherwise, the terminal switches abnormally this time. Switching an exception can cause the switch to fail or initiate the switch process again.
  • the process of determining the handover delay time is currently not applicable to the LTE system.
  • the LTE system adopts flexible bandwidth technology, this will result in more handover scenarios than the current 3GPP system, and the current process of determining the handover delay time is not applicable to the LTE system; the system timing information decoding and the cell of the LTE system The process of searching and the like is different from the current 3GPP system, and the process of determining the handover delay time is not applicable to the LTE system; since the transmission time interval of the LTE system and the use of the physical channel are different from the current 3GPP system, the current determination is made. The process of switching delay time is not applicable to LTE systems.
  • the interrupt time is defined as the time between the user equipment (UE, User Equipment) expecting to receive the next SDU and the UE actually receiving the next non-repeating SDU.
  • UE User Equipment
  • the SDU transmission interval is equivalent to the handover execution time.
  • the technique proposes a maximum interruption time of twice the SDU arrival time interval for the handover execution time.
  • the technology proposes that the maximum interruption time is the handover execution time plus several times the SDU arrival interval, where several times the SDU arrival interval is because a duplicate SDU is received.
  • the received SDU is buffered in the target cell.
  • (2) Forwarding method Establish a data tunnel between the target cell and the source cell in the handover preparation phase. For real-time services, data forwarding starts after the tunnel is established. For non-real-time services, data forwarding starts after the UE side handover execution, and only forwards. The SDU that the UE failed to receive on the source cell.
  • the technique proposes that the maximum interruption time is twice the switching execution time plus the SDU arrival time interval.
  • the technique can only be based on the fact that the handover execution time is close to the SDU Arrival Time (ISAT). Therefore, the result of the technology's analysis of the interruption time performance of the real-time service is not a performance requirement; in addition, since the technology does not take into account the repeated SDUs that may be received in the non-real-time service, the accuracy is not high.
  • ISAT SDU Arrival Time
  • Another solution in the prior art is: defining an interruption time for the UE to receive the last downlink Media Access Control Protocol Data Unit (DL MAC PDU) to the UE on the source cell. The time between receiving the first DL MAC PDU on the target cell.
  • DL MAC PDU downlink Media Access Control Protocol Data Unit
  • Embodiments of the present invention provide a handover control method and apparatus for determining a start position and an interruption time of a data flow interruption according to actual conditions to determine a performance requirement of an interruption time, thereby more accurately controlling a handover process.
  • the embodiment of the invention provides a handover control method, including:
  • the embodiment of the present invention provides a handover control method for an LTE system, where the method includes: after the terminal transmits and receives the last transmission block of the source cell, determining whether the source cell switches to the target cell within the set handover execution time, If yes, the handover is successful; the handover execution time includes starting from the end of the transmission and reception of the last transport block of the source cell, re-confirming the target cell system timing information or decoding the target cell system timing information or/and the target cell search, the physical channel The time required to synchronize the transmission time synchronization process of the transport block in the target cell.
  • An embodiment of the present invention provides a handover control apparatus, including:
  • the determining unit determines whether the terminal is connected to the target cell within a predetermined interruption time; the switching control unit is configured to start and control the switching process according to the switching command; and the switching control unit controls to perform normal switching.
  • Another embodiment of the present invention provides a handover control apparatus, where the apparatus includes:
  • the determining unit determines whether the switching is completed in the preset switching delay time or the switching execution time, and if yes, determines that the switching is successful;
  • a switching control unit configured to start and control a switching process according to the switching command
  • the handover control unit controls to perform the normal handover.
  • the method provided by the present invention determines the handover delay time and the handover execution time in the handover process of the LTE system, thereby completing the handover control process.
  • the service information used by the terminal user is analyzed, and the performance requirements of different handover interruption times in each case are determined according to the corresponding relationship, and the handover interruption time is also determined.
  • FIG. 3 is a flow chart of another process for real-time services in the prior art
  • FIG. 6 is a flowchart of a method in an embodiment of the present invention.
  • FIG. 7 is a flowchart of a method for handover of a terminal in a first embodiment of the present invention.
  • FIG. 8 is a flowchart of a method for handover of a terminal according to a second embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a system in an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a system according to an embodiment of the present invention.
  • FIG. 11 is a flowchart of a method for handover of a terminal according to still another embodiment of the present invention. detailed description
  • a handover control method provided in an embodiment of the present invention includes the following steps:
  • the terminal receives/transmits data in the source cell, and includes receiving a handover command sent by the original cell, and receiving or sending user data on the source cell.
  • the terminal connects to the target cell during the interruption time, that is, the terminal sends an access signal or/and control signaling, receives or sends user data on the target cell, the handover execution is completed.
  • the system in the embodiment of the present invention includes:
  • the terminal 100 is configured to receive/transmit a data packet on the source cell and the target cell and perform handover.
  • the source cell control unit 200 is configured to send a data packet to or receive a data packet from the terminal before the handover;
  • the target cell control unit 300 It is used to send a data packet to or receive a data packet from the terminal after the handover.
  • the system further includes: a time setting unit 400, configured to establish and store a correspondence between an interruption time and a service type.
  • the terminal 100 is further configured to: initiate a handover request;
  • the source cell control unit 200 is further configured to receive a handover request initiated by the terminal, and send a handover preparation notification to the target cell control unit;
  • the target cell control unit 300 is further configured to receive the source.
  • the handover preparation notification sent by the cell control unit completes the handover preparation.
  • the handover process includes the following steps:
  • Step 201 the terminal 100 sends a measurement report to the source cell control unit 200;
  • the terminal 100 When the terminal 100 detects that the wireless network condition changes, the terminal 100 sends a measurement report to the source cell control unit 200.
  • the change of the wireless network condition may be that the terminal 100 moves from the service coverage of one cell to the service coverage of another cell, or may be the edge of the source cell service coverage of the terminal 100. If the number of users in the target cell is small, the terminal 100 will provide services for the target cell to achieve resource balance.
  • Step 203 The source cell control unit 200 sends a handover preparation notification to the target cell control unit 300, requesting that it prepare for the handover;
  • Step 204 the target cell control unit 300 feeds back the handover preparation reply to the source cell control unit 200;
  • Step 205 The terminal 100 sends/receives the last valid transport block in the source cell control unit 200.
  • An effective transport block means that the transport block can be reassembled at the receiving end into a complete and non-repetitive high-level SDU.
  • Step 206 After receiving the handover preparation reply sent by the target cell control unit 300, the source cell control unit 200 sends a handover command to the terminal 100.
  • the terminal 100 disconnects from the source cell control unit 200 after transmitting/receiving the transport block.
  • Step 207 Receive/send an invalid transport block.
  • Step 208 Receive/send the last transport block.
  • Step 209 the terminal 100 starts to switch to the target cell
  • the handover exception processing is performed.
  • the handover exception processing may be to indicate that the handover fails and end the handover, return to the state before the handover, or may automatically re-switch, or may be another manner of exception processing.
  • the downlink interruption time refers to that the terminal receives the last valid transmission block containing the data on the downlink physical channel carrying the data of the source and the area, and the terminal starts receiving the first effective transmission block on the downlink physical channel carrying the data of the target cell. Between the time.
  • the uplink interruption time refers to that the terminal sends the first valid transport block on the uplink physical channel of the source d and the area carrying the data on the uplink physical channel containing the data effective transport block until the terminal starts to transmit the data on the uplink physical channel of the target cell bearer data. Between the time.
  • the interruption time T Intoupt is a fixed time of curing in the device, and the determination methods are as follows:
  • T Interrupt is determined by the number of service data unit SDUs included in the handover execution time and the time required for the SDU to be completely transmitted at the physical layer.
  • the T SDU is a time required for the high-level service data unit SDU to be completely transmitted on the physical channel after being multiplexed into a transport block.
  • the N is the maximum value of the number of SDUs included in the handover execution time.
  • T Intemipt is confirmed by the network to delay the disconnection with the terminal, the data forwarding delay, the time required to switch the execution process, the time required to receive the repeated SDU, and the delay between the completion of the handover execution and the reception/transmission of the first transport block by the terminal. determine.
  • T Int errupt MAX ( TExec_Time , Df orwarding + Ddetect ) + M* TSDU + Dn;
  • T Interrupt delay by switching start position delay of network acknowledgment and terminal disconnection, number The delay between the forwarding delay, the time required to switch the execution process, the time required to receive the repeated SDU, and the delay between the reception and transmission of the first transport block to the terminal after completion of the handover execution.
  • Interrupt TRJ + MAX( T Ex ec_Time , Dforwarding+ Ddetect )+ M* T SDU + Di Uo d, T Int , pt Delayed by the network to confirm disconnection with the terminal, data forwarding delay, time required for switching execution and switching The delay determination between the first transport block is received/transmitted to the terminal 100 after execution is completed.
  • T IntelTupt MAX ( T Exec - Time , Df onv arding + Ddetect ) + I3 ⁇ 4u.
  • the ⁇ is due to the delay of switching the execution start point position, the maximum is
  • the T SDU is a time required for the high-level SDU to be completely transmitted on the physical channel after being multiplexed into a transport block.
  • the D f . Ding is the network side data forwarding delay.
  • the D detect is a delay in which the network confirms disconnection from the terminal.
  • the T Exec — Time is the terminal switching execution time.
  • the M is the number of duplicate SDUs received or transmitted by the terminal.
  • the Dm is a delay between when the handover execution is completed and when the terminal 100 receives/transmits the first transport block.
  • the DKJ includes a signaling retransmission delay, a processing delay or a retransmission delay, and the like.
  • the method for determining the switching time in the foregoing embodiment is completed by giving an expression form, and can also be completed by a method for giving a constant value by a system simulation result.
  • Step 210 The terminal 100 sends signaling to the target cell control unit 300.
  • the terminal 100 sends a signaling to the target cell control unit 300 to indicate that the handover has been completed.
  • Step 211 generating a delay
  • the delay includes a signaling retransmission delay, a processing delay, or a retransmission delay.
  • Step 212 The target cell control unit 300 starts an interaction with the terminal 100.
  • the terminal 100 starts to transmit/receive the first valid transport block.
  • Step 213 The target cell control unit 300 notifies the source cell control unit 200 that the handover ends; Step 214, dry resources.
  • the source cell control unit 200 releases the resource allocated to the terminal 100 after receiving the notification message of the handover end sent by the target cell control unit 300.
  • the handover process includes the steps of:
  • Step 301 the time setting unit 400 establishes a correspondence relationship between the interruption time and the service type
  • the time setting unit 400 may be integrated in the terminal 100, may be integrated in the source cell control unit 200, and may be integrated in other units.
  • the time setting unit 400 establishes a correspondence relationship between the interruption time T Interrupt and the service type, and the specific establishment method is as follows:
  • T IntOTUpt is determined by the number of service data unit SDUs included in the handover execution time and the time required for the SDU to be completely transmitted at the physical layer.
  • the N is the maximum value of the number of SDUs included in the handover execution time.
  • the T IntOTUpt is interrupted by the switching start position, the network acknowledgement and the terminal disconnection delay, the data forwarding delay, the time required to switch the execution process, and the received SDU.
  • the required time and the delay between the completion of the handover execution and the reception/transmission of the first transport block by the terminal are determined:
  • Ti n terrupt T LY + MAX ( TE xec _Time , Dforwarding + Ddetect ) + M * TSDU + D I ( J ;
  • the T IntOTUpt is confirmed by the network to delay the disconnection from the terminal, the data forwarding delay, the time required to switch the execution process, and the repeated reception.
  • Tinterrupt MAX (TExec_Time, Dforwarding + ⁇ detect ) + M* TsDU + DlU; 2b. If the SDU is sent in segments, the data is not received completely, but the terminal 100 exchanges the last received SDU with the network. Segmentation information, and only need to resend the segment of the SDU that did not send successfully.
  • T IntOTUpt is confirmed by the network to delay the disconnection with the terminal, the data forwarding delay, the time required for the handover execution process, and the delay determination between the reception/transmission of the first transport block by the terminal 100 after the completion of the handover execution.
  • Tinterrupt MAX (TE xec _Time , Dforwarding + Dd e t ec t ) + Diu.
  • the T is a delay due to the uncertainty of the location of the handover execution start point, and the maximum is
  • the T SDU is a time required for the high-level SDU to be completely transmitted on the physical channel after being multiplexed into a transport block.
  • the D fOTWal . ding is a network side data forwarding delay.
  • the D detect is a delay generated by the network side detecting a connection lost to the terminal.
  • the T Exec — Time is the terminal switching execution time.
  • the MAX (T Exe c_Time , Dforwarding + D detect ) indicates that TE xec _Time and (Dforwarding) are taken.
  • the M is the number of duplicate SDUs received or transmitted by the terminal.
  • the DKJ is a delay between the completion of the handover execution and the reception/transmission of the first transport block by the terminal.
  • the D m includes a signaling retransmission delay, a processing delay or a retransmission delay, and the like.
  • the user plane gateway method using simultaneously transmits packets to the source cell and the target cell need not be considered 0 3 ⁇ 4 ( ⁇ and 0 (1 ⁇ 1, MAX ( T Exec _ Time,
  • Dforwarding + D detect can be expressed directly as T Exec Time.
  • the terminal 100 must complete the following operations during the interruption time:
  • the network confirms the delay caused by the disconnection of the terminal and the data forwarding, or the switching execution process
  • the terminal and the target cell After the handover execution is completed, the terminal and the target cell perform signaling exchange and signaling processing, or a retransmission process;
  • Step 302 the terminal 100 sends a measurement report to the source cell control unit 200;
  • the terminal 100 When the terminal 100 detects that the wireless network condition changes, the terminal 100 sends a measurement report to the source cell control unit 200.
  • the change of the wireless network condition may be that the terminal 100 moves from the service coverage of one cell to the service coverage of another cell, or may be the edge of the source cell service coverage of the terminal 100. If the number of users in the target cell is small, the terminal 100 will provide services for the target cell to achieve resource balance.
  • Step 303 The source cell control unit 200 sends a handover decision after receiving the measurement report.
  • Step 305 the target cell control unit 300 feeds back the handover preparation reply to the source cell control unit 200;
  • the terminal 100 queries the corresponding relationship according to the currently used service type, and obtains a corresponding interruption time.
  • Step 307 The terminal 100 sends/receives the last valid transport block from the source cell control unit 200.
  • An effective transport block means that the transport block can be reassembled at the receiving end into a complete and non-repeating high-level SDU.
  • Step 308 After receiving the switch preparation reply sent by the target cell control unit 300, the source cell control unit 200 sends a handover command to the terminal 100.
  • the terminal 100 disconnects the source cell control unit 200 after transmitting/receiving the transport block. Step 309, receiving/sending an invalid transport block;
  • Step 310 receiving/sending the last transport block
  • Step 311 The terminal 100 starts to switch to the target cell.
  • the handover abnormality processing is performed.
  • the switching abnormality processing may be a method of indicating that the handover fails and ending the handover, returning to the state before the handover, or automatically re-switching, or other abnormal processing.
  • Step 312 The terminal 100 sends signaling to the target cell control unit 300.
  • the terminal 100 sends a signaling to the target cell control unit 300 to indicate that the handover has been completed.
  • the delay includes a signaling retransmission delay, a processing delay, or a retransmission delay.
  • Step 314 the target cell control unit 300 starts interaction with the terminal 100; wherein, the terminal 100 starts to transmit/receive the first valid transport block.
  • Step 315 the target cell control unit 300 notifies the source cell control unit 200 that the handover ends; Step 316, release the resource.
  • the source cell control unit 200 releases the resource allocated to the terminal 100 after receiving the notification message of the handover end sent by the target cell control unit 300.
  • the terminal 100 reports the measurement report to the source cell control unit 200, and the source cell control unit 200 notifies the target cell control unit 300 to perform handover preparation.
  • the source cell control unit 200 sends a handover command to the terminal 100.
  • the terminal 100 performs handover, and completes the handover within the interruption time. Otherwise, the handover fails.
  • the target cell control unit 300 is completed.
  • the handover end message is sent to the source cell control unit 200, and the source cell control unit 200 releases the resources.
  • the time setting unit 400 establishes a correspondence between the interruption time and the service type. Before the source cell control unit 200 sends the handover command to the terminal 100, The time setting unit 400 queries the corresponding interrupt time according to the currently used service type, and the terminal 100 completes the handover according to the interruption time.
  • the embodiment of the invention further provides a switching control device, including:
  • the determining unit determines whether the terminal is connected to the target cell within a predetermined interruption time; the switching control unit is configured to start and control the switching process according to the switching command; and the switching control unit performs the normal processing.
  • the switching control unit performs handover exception processing
  • the handover exception processing includes indicating that the handover fails and ending the handover, returning to the state before the handover; or automatically re-switching.
  • the system further includes a storage unit configured to store a correspondence between the set interruption time and the service type;
  • the determining unit acquires an interruption time corresponding to the service type from the storage unit.
  • the handover control system provided by the present invention includes: a terminal 100, configured to receive/transmit a data packet on a source cell and a target cell and perform handover; and a source cell control unit 200, configured to The terminal sends a data packet or receives a data packet from the terminal.
  • the target cell control unit 300 is configured to send a data packet to the terminal or receive the data packet from the terminal after the handover.
  • the system further includes: a time setting unit 400, configured to establish a correspondence between the interrupt time and the service type and store the corresponding relationship.
  • the terminal 100 is further configured to initiate a handover request.
  • the source cell control unit 200 is further configured to receive a handover request initiated by the terminal, and send a handover preparation to the target cell control unit.
  • the target cell control unit 300 is further configured to receive a handover preparation notification sent by the source cell control unit and complete handover preparation.
  • the terminal 100 reports the measurement report to the source cell control unit 200, and the source cell control unit 200 sends a handover preparation notification to the target cell control unit 300 after receiving the measurement report, and the feedback is performed after the target cell control unit 300 completes the handover preparation.
  • the acknowledgment message is sent to the source cell control unit 200.
  • the source cell control unit 200 sends a handover command to the terminal 100.
  • the terminal 100 performs handover, and completes the handover within the interruption time. Otherwise, the handover fails, and after the handover is completed.
  • the target cell control unit 300 transmits a handover end message to the source cell control unit 200, and the source cell control unit 200 releases the resource.
  • the correspondence between the interruption time and the service type may be established by the time setting unit 400 before the terminal 100 reports the measurement report to the source cell control unit 200, and the feedback confirmation message is sent to the source after the target cell control unit 300 completes the handover preparation.
  • the cell control unit 200 queries the time setting unit 400 for the corresponding interrupt time according to the currently used service type, and the terminal 100 completes the handover at the interruption time.
  • the terminal 100 reports the measurement report to the source cell control unit 200, and after receiving the measurement report, the source cell control unit 200 sends a handover preparation notification to the target cell control unit 300, when the target cell control unit 300 After the handover preparation is completed, the feedback confirmation message is sent to the source cell control unit 200.
  • the source cell control unit 200 sends a handover command to the terminal 100.
  • the terminal 100 After receiving the handover command, the terminal 100 performs handover, and if the handover is not completed within the interruption time, The handover fails. If the handover is completed within the interruption time, the target cell control unit 300 transmits a handover end message to the source cell control unit 200, and the source cell control unit 200 releases the resource.
  • a method for performing handover by a terminal is as shown in FIG. 11.
  • the handover delay time or the handover execution time is set in advance in the terminal, and the handover delay time is based on a process and a delay time that the terminal passes during the handover process.
  • Determining, the handover execution time is determined according to a process to be performed by the terminal in the handover process, and the network entity involved in the method includes a terminal, a cell where the terminal is currently located, that is, a source cell, a cell to which the terminal is handed over, that is, a target cell, and
  • the specific steps are as follows:
  • Step 400 to step 401 the radio condition of the area where the terminal is located changes, and the terminal moves to the source cell. Report the measurement report.
  • Step 402 - Step 403 The source cell determines to switch the terminal according to the measurement report reported by the terminal, and sends a handover preparation request of the terminal to the target cell.
  • Step 404 - Step 405 The target cell that receives the handover preparation request prepares for handover through the network side of the LTE system, and after the handover preparation is completed, sends a handover preparation confirmation to the source cell.
  • Step 406 The source cell that receives the handover preparation confirmation sends a handover command to the terminal.
  • Step 407 After receiving the handover command, the terminal performs timing and starts handover, and after the handover to the target cell, the target cell sends a handover complete message of the terminal to the source cell.
  • the process of switching includes: switching the delay process and switching the execution process.
  • the process of switching may also include only the handover execution process.
  • the handover delay process includes: receiving a handover command start, an LTE processing delay or waiting activation time delay, transmitting and receiving of a last transmission block of a source cell, re-confirming a target cell system timing information, or decoding target cell system timing information or/and a target cell The process of searching, synchronizing the physical channel to the transmission time of the upper transport block.
  • the handover execution process includes: starting from the end of the transmission and reception of the last transport block of the source cell, re-confirming or decoding the target cell system timing information or/and the target cell search, and the physical channel synchronization to the transport block in the target cell.
  • the process of sending time synchronization includes: starting from the end of the transmission and reception of the last transport block of the source cell, re-confirming or decoding the target cell system timing information or/and the target cell search, and the physical channel synchronization to the transport block in the target cell.
  • Step 408 The terminal determines whether the handover is completed within the set handover delay time or the handover execution time. If yes, step 409 is performed; otherwise, the source cell confirms that the handover process of the terminal is abnormal, and ends (not shown).
  • An abnormality in the switching process may cause the handover to fail or re-initiate the handover process.
  • Step 409 The handover process of the terminal is successful, and the source cell releases the resources occupied by the terminal in the source cell through the network side of the LTE system, and ends.
  • the handover delay time is defined as: the time between the completion of reception of the last transmission data block containing the handover command on the source cell to the time when the terminal starts transmitting and receiving user data on the physical channel of the target cell.
  • the handover delay time also includes the handover execution time of the terminal, and the handover execution time is defined as: the terminal completes the transmission and reception of the last transmission data block containing the data on the source cell until the terminal starts to send and receive user data on the physical channel of the target cell. time.
  • the handover delay time includes an activation time included in the handover command and a handover execution time; if the source cell sends a handover command to the terminal The activation time is included and the indicated activation time is the current time or is not greater than the processing delay time of the terminal, or the switching time sent by the source cell to the terminal does not include the activation time, and the handover delay time includes the processing delay time of the terminal and the handover. execution time.
  • the following describes in detail how to determine the handover execution time of the terminal for different handover procedures.
  • the terminal is switched from FDD cell handover to FDD cell
  • the terminal When the terminal does not need to change the operating frequency during the handover process, the terminal completes the process of re-confirming the identified target cell system timing information or/and the unidentified target cell search, the process of physical channel synchronization, and the transport block in the target cell.
  • the process of sending time synchronization Therefore, when determining the handover execution time of the terminal, it is required to include the process time of the identified target cell system timing information re-confirmation and/or the unidentified target cell search, the process time of the physical channel synchronization, and the transmission time synchronization of the transport block in the target cell. Process time.
  • the terminal When the terminal needs to change the operating frequency during the handover process, the terminal completes the process of decoding the identified target cell system timing information or/and the unidentified target cell search, the process of physical channel synchronization, and the transmission of the transport block in the target cell.
  • the process of time synchronization Therefore, when determining the handover execution time of the terminal, it is required to include decoding the identified target cell system timing information or/and the process time of the unidentified target cell search, the process time of the physical channel synchronization, and the transmission time synchronization of the transport block in the target cell. Process time.
  • the terminal is switched from the FDD cell to the TDD cell.
  • the terminal can support two modes, FDD and TDD.
  • the terminal completes the frame timing synchronization process, the process of waiting for the uplink access time slot to appear, the process of re-confirming the target cell system timing information, and The process of transmitting timing synchronization of transport blocks in the target cell. Therefore, when determining the handover execution time of the terminal, the process time including the completion of the frame timing synchronization, the process time of waiting for the uplink access slot to appear, the process time of the re-confirmation of the target cell system timing information, and the transport block in the target cell are required. The process time for sending timing synchronization.
  • the terminal completes the frame timing synchronization process, the process of waiting for the uplink access time slot to appear, the process of decoding the target cell system timing information, and the process of decoding the target cell system timing information.
  • the terminal When the target cell is an unidentified cell, the terminal completes the process of frame timing synchronization, the process of waiting for the uplink access slot to appear, the process of searching for the unidentified target cell, and the transmission timing synchronization of the transport block in the target cell. the process of. Therefore, when determining the handover execution time of the terminal, the process time including frame timing synchronization, the process time of waiting for the uplink access slot to appear, the process time for searching for the unidentified target cell, and the transmission timing of the transport block in the target cell are required. Synchronization process time.
  • the frame timing synchronization process may be a process in which a channel required for synchronization is present, and therefore, the frame timing synchronization process time may be a process time in which a channel required for synchronization is present.
  • the process time at which the terminal performs frame timing synchronization that is, the process time required for the channel waiting for synchronization to occur is 5 milliseconds (ms) times, instead of 10 ms in the prior art, so it can be determined that the process time of the frame timing synchronization can be set. Set to 5ms.
  • the process time of the unknown cell search or the system timing information confirmation of the known cell is different from the time used by the prior art, mainly because the frame structure of the LTE system and the frame structure of the 3GPP system are not the same.
  • the process timing of the transmission timing synchronization of the transport block in the target cell may be determined to be an integer multiple of 0.675 ms or 0.5 ms or 0.5 ms, which is also different from the prior art 10 ms.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif pour commande de commutateur, qui commande la commutation en fonction d'une détermination de besoins de performance de temps de commutation programmé. Le procédé comprend une étape, lorsqu'il est nécessaire de commuter des cellules pendant la réception ou la transmission de données par la cellule, de détermination du temps d'interruption depuis la cellule source vers la cellule cible en fonction du de temps de transmission et du temps de délai nécessaire à l'unité de données d'opération en corrélation, suite à la réception ou la transmission de l'unité de données d'opération en corrélation, si le terminal est connecté à la cellule cible, alors l'opération de commutation est terminée. Le dispositif comporte: une unité de détermination, qui détermine si le terminal se connecte à la cellule cible dans le temps programmé; une unité de commande de commutation, qui démarre et commande le processus de commutation selon la commande de commutation. Étant donné que la situation d'interruption précise de flux de données et le temps d'interruption sont déterminés, la précision et la flexibilité du processus de commande de commutation sont améliorées.
PCT/CN2007/001309 2006-04-21 2007-04-20 Procédé et dispositif pour commande de commutateur WO2007124677A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CNB2006100745946A CN100461961C (zh) 2006-04-21 2006-04-21 一种长期演进系统的切换控制方法
CN200610074594.6 2006-04-21
CN200610074511.3 2006-04-21
CNB2006100745113A CN100490556C (zh) 2006-04-21 2006-04-21 一种切换控制方法及系统

Publications (1)

Publication Number Publication Date
WO2007124677A1 true WO2007124677A1 (fr) 2007-11-08

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PCT/CN2007/001309 WO2007124677A1 (fr) 2006-04-21 2007-04-20 Procédé et dispositif pour commande de commutateur

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WO (1) WO2007124677A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111556517A (zh) * 2020-04-28 2020-08-18 锐迪科微电子科技（上海）有限公司 异常链路的处理方法及设备
US20220053384A1 (en) * 2018-10-05 2022-02-17 Nokia Technologies Oy Enhanced method for preparing conditional handover to avoid preemption

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1451250A (zh) * 2000-03-23 2003-10-22 西门子移动通讯公司 无线通信系统中的切换过程
US20040203787A1 (en) * 2002-06-28 2004-10-14 Siamak Naghian System and method for reverse handover in mobile mesh Ad-Hoc networks
WO2005011177A2 (fr) * 2003-07-17 2005-02-03 Interdigital Technology Corporation Procede de signalisation pour la commande d'un reseau local sans fil (wlan)

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1451250A (zh) * 2000-03-23 2003-10-22 西门子移动通讯公司 无线通信系统中的切换过程
US20040203787A1 (en) * 2002-06-28 2004-10-14 Siamak Naghian System and method for reverse handover in mobile mesh Ad-Hoc networks
WO2005011177A2 (fr) * 2003-07-17 2005-02-03 Interdigital Technology Corporation Procede de signalisation pour la commande d'un reseau local sans fil (wlan)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220053384A1 (en) * 2018-10-05 2022-02-17 Nokia Technologies Oy Enhanced method for preparing conditional handover to avoid preemption
US11838804B2 (en) * 2018-10-05 2023-12-05 Nokia Technologies Oy Enhanced method for preparing conditional handover to avoid preemption
CN111556517A (zh) * 2020-04-28 2020-08-18 锐迪科微电子科技（上海）有限公司 异常链路的处理方法及设备
CN111556517B (zh) * 2020-04-28 2023-08-08 锐迪科微电子科技（上海）有限公司 异常链路的处理方法及设备

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