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WO2013000235A1 - Procédé et appareil pour le transfert intercellulaire d'un terminal - Google Patents

Procédé et appareil pour le transfert intercellulaire d'un terminal Download PDF

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Publication number
WO2013000235A1
WO2013000235A1 PCT/CN2011/082604 CN2011082604W WO2013000235A1 WO 2013000235 A1 WO2013000235 A1 WO 2013000235A1 CN 2011082604 W CN2011082604 W CN 2011082604W WO 2013000235 A1 WO2013000235 A1 WO 2013000235A1
Authority
WO
WIPO (PCT)
Prior art keywords
handover
reported
determining
measurement event
threshold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2011/082604
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English (en)
Chinese (zh)
Inventor
景晓玺
桑健
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
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 ZTE Corp filed Critical ZTE Corp
Publication of WO2013000235A1 publication Critical patent/WO2013000235A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a method and an apparatus for terminal handover. Background technique
  • LTE Long Term Evolution
  • UE assistance In order to achieve seamless handover, it is necessary to minimize the interruption time and avoid data loss.
  • the switching process is as follows:
  • the UE User Equipment, User Terminal, Terminal
  • the evolved NodeB evolved NodeB, eNB for short.
  • the source eNodeB determines the handover target cell based on the measurement report and the RRM (Radio Resource Management) algorithm, and sends the UE context information (Ue Context) along with the handover request to the eNodeB of the handover target cell;
  • RRM Radio Resource Management
  • the target eNodeB forwards the C-RNTK cell radio network temporary identifier pre-assigned to the handover UE and other parameters (access parameters, SIB (system information block), etc.) to the source eNodeB in a context confirmation message.
  • the source eNodeB forwards the data packet to the target eNodeB, and the source eNodeB sends a handover command (HandOver Command) to the UE.
  • the UE receives the handover command, according to the target cell identifier carried in the handover command, from the source.
  • the cell is detached and establishes uplink synchronization with the target eNB;
  • the target eNodeB returns a TA (time advance) and indicates the allocated resource location to the UE, and the UE returns a HandOver Comfirm message to the target eNodeB.
  • TA time advance
  • the target eNodeB indicates to the source eNodeB that the handover is complete, and the source eNodeB clears the data that has been forwarded to the target eNodeB.
  • the technical problem to be solved by the present invention is to provide a method and apparatus for terminal handover to avoid service interruption of the terminal.
  • the present invention provides a method for handover of a terminal, including: a source evolved base station (eNB), after determining that a user equipment (UE) needs to be handed over, determining, according to a measurement report reported by the UE, to the UE The number N of handover commands sent; during the handover of the UE, N handover commands are sent to the UE.
  • eNB source evolved base station
  • UE user equipment
  • the determining, according to the measurement report reported by the UE, the number N of handover commands sent to the UE including:
  • the determining, according to the measurement event reported by the UE, the number N of handover commands sent to the UE includes: determining, when the measurement event reported by the UE is A5, the number of handover commands sent to the UE N > 2.
  • N 3.
  • the determining, according to the measurement event reported by the UE and the signal quality of the current serving cell, the number N of handover commands sent to the UE including:
  • the signal quality of the current serving cell includes: reference signal received power (RSRP) Or reference signal reception quality (RSRQ)
  • the present invention further provides a device for terminal handover, which is located in an evolved base station (eNB), and includes a handover command number determining module and a handover command sending module, where: the handover command number determining module, And determining, after determining that the user equipment (UE) needs to be handed over, determining, according to the measurement report reported by the UE, the number N of handover commands sent to the UE;
  • eNB evolved base station
  • the handover command sending module is configured to send N handover commands to the UE during handover of the UE.
  • the number of handover command determination modules is set to determine the number of handover commands sent to the UE according to the measurement report reported by the UE in the following manner:
  • the handover command number determining module is configured to determine, according to the measurement event reported by the UE, the number N of handover commands sent to the UE in the following manner: when the measurement event reported by the UE is A5, the handover command The number determination module determines the number of handover commands N > 2 to be sent to the UE.
  • N 3.
  • the handover command number determining module is configured to determine, according to the measurement event reported by the UE and the signal quality of the current serving cell, the number N of handover commands sent to the UE in the following manner:
  • N A is determined
  • the signal quality of the current serving cell includes: reference signal received power (RSRP) or reference signal received quality (RSRQ).
  • RSRP reference signal received power
  • RSSQ reference signal received quality
  • the method and the device of the present invention determine whether to issue multiple handover commands by determining the signal quality of the serving cell and the neighboring cell for the same handover, so as to ensure that the UE can receive the handover command in time.
  • the handover success rate is increased, so that the UE synchronizes in the target cell as soon as possible, thereby reducing the handover delay and enhancing the user experience in the handover process.
  • FIG. 1 is a flowchart of a handover command setting when a measurement event is an A3 event according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a handover command delivery process according to Embodiment 1 of the present invention
  • FIG. 3 is a flowchart of setting a handover command when an event is measured as an A5 event according to Embodiment 3 of the present invention.
  • the existing handover process analysis shows that after the source eNodeB sends a handover command to the UE, the UE at this time is usually at the cell edge, and the signal quality is poor. It is very likely that HARQ (Hybrid Automatic Retransmission) or RLC (Radio Link Control) will occur. The retransmission of the layer is prone to the phenomenon that the UE does not receive the handover command or receives the handover command too late.
  • the target eNodeB has allocated resources to the UE when the LTE system handover is a handover. If the UE does not receive the handover command or receives the handover command too late, the UE cannot synchronize to the target cell. Interrupted.
  • the source eNB determines the number N of handover commands sent to the UE according to the measurement report reported by the UE. In the handover process of the UE, the N handover commands are sent to the UE.
  • N is a positive integer > 1.
  • the RLC layer retransmission or the MAC layer HARQ retransmission occurs. If there is a new handover command, the new handover command may be more likely.
  • the retransmission handover command is received by the UE earlier, so that the UE synchronizes in the target cell as soon as possible, thereby reducing the handover delay, avoiding service interruption, and enhancing the user experience in the handover process.
  • the source eNB may determine, according to the measurement event reported by the UE, the number N of handover commands sent to the UE, or determine, according to the measurement event reported by the UE and the signal quality of the current serving cell, to the UE.
  • the UE reports an A5 measurement event, and the A5 measurement event is defined as the serving cell signal is lower than a threshold, and the neighbor signal is higher than a threshold.
  • the signal quality of the UE serving cell is poor, and the signal quality of the neighboring cell is good.
  • the A3 measurement event is defined as the difference between the neighboring cell signal quality parameter and the serving cell signal quality parameter is greater than a threshold.
  • the serving cell signal is not necessarily poor, and the number of sending handover commands is further determined according to the signal quality of the current serving cell reported by the UE. The principle is: if the serving cell signal is good, the handover command does not need to be sent multiple times. Otherwise, the switch command is issued multiple times. specifically:
  • N A is determined
  • the range of A is [3, 5]
  • the range of B is [2, 3].
  • RSRP Reference Signal Received Power
  • the implementation can be implemented using the process shown in Figure 1, but it can also be implemented using other processes.
  • RSRQ Reference Signal Reception Quality
  • RSRP Reference Signal Reception Quality
  • the apparatus located in the eNB that implements the foregoing method includes a handover command number determining module and a handover command sending module, where:
  • the switching command number determining module is configured to determine, according to the measurement report reported by the UE, the number N of handover commands sent to the UE after determining that the UE needs to be handed over;
  • the handover command sending module is configured to send N handover commands to the UE during the handover process of the UE.
  • the handover command number determining module is configured to determine, according to the measurement report reported by the UE, the number N of handover commands sent to the UE in the following manner: determining, according to the measurement event reported by the UE, sending to the UE The number N of handover commands is determined, or the number N of handover commands sent to the UE is determined according to the measurement event reported by the UE and the signal quality of the current serving cell.
  • the handover command number determining module is configured to determine, according to the measurement event reported by the UE and the signal quality of the current serving cell, the number N of handover commands sent to the UE in the following manner:
  • N A is determined
  • the measurement event reported by the UE is A3, and the signal quality of the current serving cell reported by the UE is small.
  • N C;
  • Step 110 The UE sends a measurement report to the eNodeB.
  • Step 120 the eNodeB determines the handover target cell based on the measurement report and the RRM algorithm, and sends the context information of the UE along with the handover request to the eNodeB of the handover target cell;
  • Step 130 the target eNodeB returns the C-RNTI and other parameters (access parameters, SIB, etc.) pre-assigned to the handover UE to the source eNodeB in the context confirmation message;
  • Step 140 After receiving the context confirmation message, the source eNodeB forwards the data packet to the target eNodeB.
  • Step 150 The source eNodeB determines that the measurement event in the UE measurement report is A3, and the RSRP value of the serving cell reported by the UE is greater than 100 dBm, and determines that the number of times the handover command is sent is three times; Step 160, the source eNodeB sends the number of transmissions according to the determined number of times.
  • the UE sends a handover command.
  • the source eNodeB can be implemented by using a timer in combination with a counter. For example, the source eNodeB can set the total number of handover command transmission counters (HoTime) to 3, and a handover command retransmission timing of a time length of Ts. , implemented by the process shown in Figure 2, including:
  • Step a the source eNodeB sends a handover command to the UE, and the handover command sends a counter plus one;
  • step b starts a handover command retransmission timer;
  • Step c determining whether the handover command retransmission timer expires, if yes, executing step d, if not, returning to step c;
  • Step d Determine whether the handover command transmission counter is equal to the total number of handover command transmission counters, and if yes, end, if not, return to the step.
  • timer in combination with the counter in this embodiment is merely an example. In other embodiments, other known methods may be used.
  • Step 170 The UE receives the handover command, starts the uplink synchronization process of the target eNodeB, and acquires the uplink TA from the target eNodeB.
  • Step 190 the target eNodeB indicates to the source eNodeB that the handover is completed, and the source eNodeB clears the data that has been forwarded to the target eNodeB.
  • Step 210 The UE sends a measurement report to the eNodeB.
  • Step 220 The eNodeB determines the handover target cell based on the measurement report and the RRM algorithm, and sends the context information of the UE to the eNodeB of the handover target cell along with the handover request.
  • Step 230 the target eNodeB returns the C-RNTI and other parameters (access parameters, SIB, etc.) pre-assigned to the handover UE to the source eNodeB in the context confirmation message;
  • Step 240 after receiving the context confirmation message, the source eNodeB forwards the data packet to the target eNodeB.
  • Step 250 The source eNodeB determines that the measurement event in the UE measurement report is A3, and the RSRP value of the serving cell reported by the UE is less than 90 dBm, and determines that the number of times the handover command is sent is one time; Step 260, the source eNodeB sends the number of transmissions according to the determined number of times. The UE sends a handover command.
  • the source eNodeB determines that the measurement event in the UE measurement report is A3, and the RSRP value of the serving cell reported by the UE is less than 90 dBm, and determines that the number of times the handover command is sent is one time;
  • Step 260 the source eNodeB sends the number of transmissions according to the determined number of times.
  • the UE sends a handover command.
  • Step 270 The UE receives the handover command, starts the uplink synchronization process of the target eNodeB, and acquires the uplink TA from the target eNodeB.
  • Step 280 The target eNodeB returns a TA to the UE and indicates the allocated resource location to the UE.
  • the UE returns a handover complete message to the target eNodeB;
  • Step 290 the target eNodeB indicates to the source eNodeB that the handover is completed, and the source eNodeB clears the data that has been forwarded to the target eNodeB.
  • Step 310 the UE sends a measurement report to the eNodeB.
  • Step 320 the eNodeB determines the handover target cell based on the measurement report and the RRM algorithm, and The context information of the UE is sent along with the handover request to the eNodeB of the handover target cell;
  • Step 330 the target eNodeB returns the C-RNTI and other parameters (access parameters, SIB, etc.) pre-assigned to the handover UE to the source eNodeB in the context confirmation message;
  • Step 340 After receiving the context confirmation message, the source eNodeB forwards the data packet to the target eNodeB.
  • Step 350 The source eNodeB determines that the measurement event in the UE measurement report is A5, and determines that the number of times the handover command is sent is three times;
  • Step 360 The source eNodeB sends a handover command to the UE according to the determined number of transmissions. For details, refer to the description in Embodiment 1.
  • Step 370 The UE receives the handover command, starts the uplink synchronization process of the target eNodeB, and acquires the uplink TA from the target eNodeB.
  • Step 380 The target eNodeB returns a TA to the UE and indicates the allocated resource location to the UE, and the UE returns a handover complete message to the target eNodeB.
  • Step 390 The target eNodeB indicates to the source eNodeB that the handover is completed, and the source eNodeB clears the data that has been forwarded to the target eNodeB.
  • the foregoing technical solution provides a method and device for terminal handover, which avoids service interruption of the terminal.
  • the method and the device determine, according to the signal quality of the serving cell and the neighboring cell, whether to issue multiple handover commands to ensure that the UE can receive the handover command in time and increase the handover success. Rate, enable the UE to synchronize in the target cell as soon as possible, thereby reducing the handover delay and enhancing the user experience during the handover process.

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  • 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 appareil pour le transfert intercellulaire d'un terminal, et ledit procédé se déroule de la manière suivante : lorsqu'il a été déterminé, suivant un compte rendu de mesure en provenance d'un équipement utilisateur (UE), que cet UE a besoin d'un transfert intercellulaire, un nœud B évolué (eNB) détermine le nombre N d'ordres de transfert intercellulaire envoyés à cet UE et envoie N ordres de transfert intercellulaire à l'UE au cours du processus de transfert intercellulaire de l'UE, N étant un nombre entier positif. Ce procédé et cet appareil évitent l'interruption de la desserte du terminal.
PCT/CN2011/082604 2011-06-28 2011-11-22 Procédé et appareil pour le transfert intercellulaire d'un terminal Ceased WO2013000235A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110176027.2A CN102857964B (zh) 2011-06-28 2011-06-28 一种终端切换的方法及装置
CN201110176027.2 2011-06-28

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WO2013000235A1 true WO2013000235A1 (fr) 2013-01-03

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10091699B2 (en) * 2013-02-13 2018-10-02 Qualcomm Incorporated Handover decisions based on absolute channel quality of serving cell
CN104053197A (zh) * 2013-03-15 2014-09-17 中国移动通信集团公司 地空长期演进系统中飞机器的切换方法、基站及飞行器
CN103731891B (zh) * 2013-12-27 2017-08-29 上海华为技术有限公司 控制方法和装置
WO2020061899A1 (fr) * 2018-09-27 2020-04-02 华为技术有限公司 Procédé et dispositif de commutation de cellule

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101466127A (zh) * 2008-12-30 2009-06-24 上海无线通信研究中心 一种提高切换成功率的小区切换方法
CN101877895A (zh) * 2009-04-30 2010-11-03 大唐移动通信设备有限公司 一种小区切换方法和系统
CN102084687A (zh) * 2008-07-04 2011-06-01 爱立信电话股份有限公司 移动电信网络中的切换命令大小的修改

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8380196B2 (en) * 2007-04-27 2013-02-19 Telefonaktiebolaget Lm Ericsson (Publ) Handover using dedicated resources reserved for a limited time interval

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102084687A (zh) * 2008-07-04 2011-06-01 爱立信电话股份有限公司 移动电信网络中的切换命令大小的修改
CN101466127A (zh) * 2008-12-30 2009-06-24 上海无线通信研究中心 一种提高切换成功率的小区切换方法
CN101877895A (zh) * 2009-04-30 2010-11-03 大唐移动通信设备有限公司 一种小区切换方法和系统

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CN102857964B (zh) 2017-02-15

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