WO2008025288A1 - Procédé et terminal pour commander un rétablissement de connexion dans un système lte - Google Patents

Procédé et terminal pour commander un rétablissement de connexion dans un système lte Download PDF

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Publication number
WO2008025288A1
WO2008025288A1 PCT/CN2007/070526 CN2007070526W WO2008025288A1 WO 2008025288 A1 WO2008025288 A1 WO 2008025288A1 CN 2007070526 W CN2007070526 W CN 2007070526W WO 2008025288 A1 WO2008025288 A1 WO 2008025288A1
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WO
WIPO (PCT)
Prior art keywords
terminal
connection
delay time
initial access
cell
Prior art date
Application number
PCT/CN2007/070526
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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
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008025288A1 publication Critical patent/WO2008025288A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and a terminal for controlling connection reestablishment in a long term evolution system.
  • LTE Long Term Evolution
  • the goal of long-term evolution 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 reduced response times, higher user data rates, increased system capacity and coverage, and reduced operator cost.
  • the terminal Due to the inevitable obstacles and shields in the real network, these effects can cause the terminal to have poor signal quality at a certain time at a certain time, which may result in the loss of the wireless connection due to the failure of the wireless link.
  • the network does not immediately release the resources allocated to the terminal, but reserves these resources to wait for the terminal to perform the initial access process. Therefore, after the wireless connection is lost, the terminal should be able to perform cell search in a short time, for example, searching for a cell in the neighbor list, and after searching for a suitable cell, performing an initial access operation, for example, Establish an RRC (Radio Resource Control) connection or perform cell handover.
  • RRC Radio Resource Control
  • the terminal wireless connection when the terminal wireless connection is lost, measurement of the physical channel is started, after 160 ms, based on the measured channel quality and a threshold. The values are compared, and if the channel quality is always less than the threshold within this 160 milliseconds, then the wireless link is considered to have failed. Then, the terminal searches for a cell, and after searching for the cell, the UE (customer equipment, user equipment) upper layer requests to initiate an RRC connection re-establishment process or a handover process. The UE's upper layer sends an RRC connection reestablishment through the common control channel. begging.
  • the establishment process of the RRC connection includes an optional cell reselection, access control, and establishment of an L2 signaling connection.
  • the network may retain resources for a long time, which may result in serious resource waste, which may reduce the cell throughput and affect system performance, especially for requirements.
  • LTE systems with features such as high data rate, low response time, and optimal packet access.
  • the embodiments of the present invention provide a method for controlling connection reestablishment in a long term evolution system to effectively control reestablishment of a terminal RRC connection in an LTE system, thereby saving network resources.
  • Another aspect of the embodiments of the present invention provides a terminal to reduce the time for the RRC connection reestablishment of the terminal, and avoid long-term occupation of network resources.
  • a method for controlling connection reestablishment in a long term evolution system comprising:
  • the terminal detects that the wireless link fails.
  • the terminal begins performing an initial access operation on the initial access channel during the connection reestablishment delay time.
  • a terminal comprising: a transceiver unit,
  • connection reconstruction delay time setting unit configured to determine a delay time according to a type of the target cell that the terminal needs to search
  • the detecting unit is connected to the connection re-establishment delay time setting unit, and is configured to detect whether the time of the terminal connection re-establishment execution exceeds the determined delay time.
  • connection re-establishment process of the LTE system determining a reasonable delay time according to the type of the target cell that the terminal needs to search, and controlling the terminal within the determined delay time.
  • the connection re-establishment process is completed, so that the connection reconstruction is successful, and the network is prevented from retaining resources for a long time, thereby reducing the waste of network resources, ensuring the cell throughput, and reducing the impact of the reserved resources on the system performance.
  • FIG. 1 is a flowchart of an implementation of a first embodiment of a method according to the present invention
  • FIG. 2 is a flowchart of an implementation of a second embodiment of a method according to the present invention.
  • FIG. 3 is a schematic block diagram of one embodiment of a terminal of the present invention. detailed description
  • the embodiments of the present invention are directed to the LTE system requirements for reduced response time, higher user data rate, and system capacity.
  • a reasonable connection is determined according to the type of the target cell that the terminal needs to search.
  • the reconstruction delay time is completed, and the control terminal completes the connection reconstruction process within a determined delay time.
  • connection reestablishment delay time is determined by some or all of the time required to search for the cell, the time required to search for the sector, the time required to obtain the system information, and the delay generated by the initial access operation. Specifically, if the target cell to be searched, for example, the cell in the neighbor cell list maintained by the terminal, is located at the same frequency layer, the connection reconstruction delay time is required by the time required to search for the cell, the time required to read the system information, and the initial connection.
  • the delay time caused by the incoming process is determined; if the target cell being searched is located at a different frequency layer, the connection reconstruction delay time is the product of the time required to search for the cell and the number of search cells, the time required to read the system information, and the initial connection
  • the delay time caused by the incoming process is determined; in the case where the target cell has multiple sectors, the time required to search for the sector is also considered.
  • the delay caused by the initial access procedure described above may be after the cell search and system information acquisition.
  • the access slot waiting for the transmission may be required to arrive. This waiting time is caused by the initial access procedure.
  • Delay in addition, in the case of transmitting a connection reestablishment request, the delay of the initial access includes the time to transmit the preamble and the correct response of the waiting network, in addition to waiting for the arrival of the access slot.
  • the present invention needs to determine a reasonable connection re-establishment delay time according to factors required to perform the connection re-establishment process, and control the terminal to start the initial execution within the determined connection re-establishment delay time. Access operation. If the terminal fails to perform the initial access operation on the initial access channel within the determined connection re-establishment delay time, the connection failure processing is performed, or the connection re-establishment attempt is re-established, to avoid the network side retaining resources for a long time and affecting the cell throughput. .
  • the terminal After confirming the failure of the radio link, the terminal needs to perform cell search. After finding a suitable campable cell, it starts to receive relevant system information on the cell, and finds an appropriate RACH according to the information provided in the system information block (Randic Access Channel, random access channel), the initial access process. To this end, the present invention determines a reasonable connection reconstruction delay time based on the different conditions of the cell to be searched during the connection reconstruction process.
  • the connection re-establishment process will be separately described below for the different operations that the terminal needs to perform during the connection re-establishment process.
  • the terminal After the terminal detects the loss of the wireless connection, perform cell search, wherein the searched cells are all the same carrier frequency (this is determined by network planning, usually in order to increase the capacity, the operator will use the second, or third Frequency)) After searching for a cell whose signal strength meets the requirements, the relevant system information is received from the common channel of the cell, and then the initial access operation is performed. For example, a random access process or a handover process. If the service currently performed by the terminal requires data lossless quality of service, the terminal may send a forward handover request in the initial access procedure of the connection reestablishment, so that the network needs to perform data forwarding operation after the connection reestablishment is completed, and the terminal loses the link.
  • cell search wherein the searched cells are all the same carrier frequency (this is determined by network planning, usually in order to increase the capacity, the operator will use the second, or third Frequency))
  • the relevant system information is received from the common channel of the cell, and then the initial access operation is performed. For
  • the data on the former serving cell is forwarded to the target cell, and then sent by the target cell to the terminal to ensure data loss.
  • Some services such as voice services, a certain number of data packets are allowed to be lost, but the delay requirements are strict.
  • the terminal After the terminal detects that the wireless connection is lost, performing cell search, where the searched cell includes: a cell with the same carrier frequency and a cell with different carrier frequencies, and the terminal needs to adjust the frequency in addition to the cell of the same frequency.
  • the relevant system information is received from the common channel of the cell, and then the initial access operation is performed.
  • the LTE system In the existing GSM (Global System for Mobile Communications) system, in order to expand the system capacity, when the traffic of a cell is too large, the cell will be divided into multiple sectors, and the corresponding antenna will be added. . Also, in the LTE system, one cell can be divided into a plurality of sectors during network planning. 4 Let one cell be divided into three sectors, then in this cell, the same common channel, such as a synchronization channel and a broadcast channel, may be used. However, the LTE system is a multi-carrier system based on OFDM (Orthogonal Frequency Division Multiplexing), which can allocate different frequency bands to different sectors, and different frequency bands may be configured with different pilot channels. Therefore, the pilots for each cell are different.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the cell search process can only detect the signal strength and channel quality of the cell common channel, and the terminal needs to select the cell to be camped according to the signal strength, and then the terminal needs to continue searching and detecting.
  • the pilot channel of the sector is determined by comparing the channel quality Which sector of the cell is camped on. That is to say, when several sectors in a cell use the same common channel and different pilot channels, the terminal not only needs to search for the cell, but also searches for sectors in the cell. Then, in the above two processes, it is also necessary to increase the process of sector search, that is, after searching for the sector with the best signal quality, the initial access process is performed.
  • the delay time determined by the present invention may specifically be the following:
  • connection reestablishment delay time TRRC_RE-ESTABLISH is:
  • connection reestablishment delay time TRRC_RE-ESTABLISH is:
  • TRRC— RE-ESTABLISH Nfrequency*Tsearch + TSI+ TRA
  • Tsearch is the time required to search for a cell
  • the TSI is the time required to read system information, including receiving relevant system information and high-level processing delay time of the system information block;
  • TRA is the delay time caused by the initial access procedure
  • Nfrequency is the number of frequencies of the cell being searched.
  • connection reestablishment delay time TRRC_RE-ESTABLISH is:
  • TRRC— RE-ESTABLISH Tsearch + TSI+ TRA + Tsector ;
  • TRRC—RE-ESTABLISH Nfrequency*Tsearch + TSI+ TRA+ Tsector where Tsector is the time required to search for a sector.
  • the terminal needs to initiate an RRC Connection Reestablishment Request or a Transmit Preamble on the initial access channel within the determined connection reestablishment delay time.
  • Step 101 Determine the delay time required for the connection re-establishment process. The determination of the delay time required for the connection reconstruction process has been described in detail above and will not be described herein.
  • Step 102 Set the timing value of the timer to the determined delay time value.
  • Step 103 After confirming that the radio link fails, the terminal starts a timer and performs an RRC connection reestablishment attempt.
  • the terminal can determine whether the wireless link fails by detecting the channel quality, and report the radio link failure to the lower layer of the terminal, for example, the physical layer, so that the physical layer performs cell search, system information reception, initial access, and the like. operating.
  • the terminal needs to do the following:
  • the terminal performs a cell search to determine a campable cell or sector; then, starts receiving system information on the determined cell or sector, and determines a random access channel according to the received system information; after the random access channel is determined, The terminal needs to start performing an access operation on the determined random access channel.
  • Step 104 Determine whether the timer time has arrived. If yes, go to step 105; otherwise, return to step 104 and wait for the timer time to arrive.
  • Step 105 Determine whether the terminal has started to send an RRC connection reestablishment request or preamble on the initial access channel. If it has already started, it proceeds to step 106; otherwise, it proceeds to step 107.
  • Step 106 Perform the normal processing flow.
  • Step 107 Perform connection failure processing, or re-initiate an RRC connection re-establishment attempt by the terminal.
  • FIG 2 there is shown an implementation flow of a second embodiment of the method of the present invention.
  • the terminal needs to initiate a handover request on the initial access channel within the determined connection reestablishment delay time.
  • the process includes the following steps:
  • Step 201 Determine the delay time required for the connection reconstruction process.
  • Step 202 Set a timing value of the timer to a determined delay time value.
  • Step 203 After confirming that the radio link fails, the terminal starts a timer and performs a cell handover attempt.
  • the terminal can determine whether the wireless link fails by detecting the channel quality, and report the radio link failure to the lower layer of the terminal, for example, the physical layer, so that the physical layer performs cell search and system information again. Information reception and initial access operations.
  • the terminal needs to do the following:
  • the terminal performs a cell search, such as searching for a cell in the neighbor list maintained by the terminal, determining a campable cell or sector; and then starting to receive system information on the determined cell or sector, and according to the received system
  • the information determines a random access channel; after the random access channel is determined, the terminal needs to start performing an access operation on the determined random access channel.
  • Step 204 Determine whether the timer time has arrived. If yes, go to step 205; otherwise, return to step 204 and wait for the timer time to arrive.
  • Step 205 Determine whether the terminal has started to send a handover request message on the initial access channel. If it has already started, it proceeds to step 206; otherwise, it proceeds to step 207.
  • Step 206 Perform a normal processing flow.
  • Step 207 Perform connection failure processing.
  • the present invention determines the connection reestablishment delay time according to the type of the target cell that the terminal needs to search by analyzing the operation required for the connection re-establishment process, and the control terminal completes the connection re-establishment process within the delay time.
  • the occupation time of the system resources can be reduced, and the system capacity and throughput can be improved.
  • FIG. 3 is a schematic block diagram of an embodiment of a terminal according to the present invention:
  • the terminal includes: a connection reestablishment delay time setting unit S11, a detecting unit S12, and a transceiving unit S13.
  • the connection reestablishment delay time setting unit S11 is configured to determine the delay time according to the type of the target cell that the terminal needs to search;
  • the detecting unit S12 is configured to detect whether the time for the terminal connection reestablishment execution exceeds the determined delay time, and if so, notify the terminal Performing a connection failure process, or re-initiating a connection re-establishment attempt by the terminal;
  • the transceiver unit S13 is configured to receive or transmit a wireless signal.
  • connection reconstruction delay time setting unit S11 calculates the total delay time according to whether the target cell that the terminal needs to search for is in the same frequency layer, and whether each cell contains multiple sectors and the like, and sends the total delay time to the detection.
  • the connection reconstruction delay time setting unit S11 can refer to the foregoing description of the method of the present invention for the determination of the connection reconstruction delay time, and details are not described herein again.
  • the detecting unit S12 counts the delay time. If the actual connection reestablishment time is less than the delay time, that is, the connection reestablishment process is completed within the delay time, the connection reestablishment is considered to be successfully completed; otherwise, if the connection reestablishment request or the preamble is not sent after the delay time is exceeded, Then, the connection reestablishment fails, the terminal is notified to perform the connection failure processing, or the connection re-initiation is initiated by the terminal.
  • the transceiver unit S13 may send a notification message to the detecting unit S12 after transmitting an RRC connection reestablishment request, or a preamble, or a handover request to the network side.
  • the detecting unit S12 internally sets a timer to time the delay time, and when the timer time arrives, sends an interrupt message to the detecting unit. In this way, the detecting unit S12 can judge whether the time for the terminal connection re-establishment execution exceeds the determined delay time according to the notification message sent by the transceiver unit S13 and the interrupt message of the internal timer. If the notification message is received before the interruption message is received, it indicates that the connection re-establishment is successfully completed.
  • the timer can be reset, and the timer is restarted after the next time the terminal confirms that the radio link has failed. If the interrupt message is received before the notification message is received, it indicates that the terminal does not complete the sending operation on the initial access channel within the set connection reestablishment delay time. At this time, the connection reestablishment failure is considered, and the terminal is notified. The connection failure processing is performed, or the connection re-initiation attempt is re-initiated by the terminal.

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

Abstract

L'invention concerne un procédé pour commander un rétablissement de connexion dans un système LTE. Dans ledit procédé, après la détection d'une rupture de liaison sans fil, le terminal démarre le processus d'accès initial sur un canal d'accès initial dans l'intervalle du délai de rétablissement. L'invention concerne également un terminal relatif. Ledit terminal comprend : une unité de détermination de délai pour déterminer le délai de rétablissement selon le type de cellule objet à rechercher; une unité de détection, qui est connectée à l'unité de détermination de délai, pour détecter si le temps nécessaire pour rétablir une connexion dépasse le délai de rétablissement. Dans la solution ci-dessus, la connexion rompue peut être rétablie avec succès, et l'utilisation prolongée des ressources est évitée.
PCT/CN2007/070526 2006-08-24 2007-08-21 Procédé et terminal pour commander un rétablissement de connexion dans un système lte WO2008025288A1 (fr)

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CN2006101113816A CN101132611B (zh) 2006-08-24 2006-08-24 长期演进系统中控制连接重建的方法、终端
CN200610111381.6 2006-08-24

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CN101848554A (zh) * 2010-05-19 2010-09-29 新邮通信设备有限公司 一种无线接口恢复方法和一种施主基站
CN102379137A (zh) * 2009-04-20 2012-03-14 华为技术有限公司 一种对消息完整性保护检查失败的处理方法、设备和系统
CN102448060A (zh) * 2010-09-30 2012-05-09 华为技术有限公司 一种密钥管理方法、检查授权方法和装置
CN107371224A (zh) * 2017-07-18 2017-11-21 深圳天珑无线科技有限公司 一种无线通信设备连接信号的方法、设备以及存储装置
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CN102223665A (zh) * 2010-04-19 2011-10-19 中兴通讯股份有限公司 无线链路失败rlf信息的处理方法及系统
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CN102316509B (zh) * 2010-06-30 2016-03-02 中兴通讯股份有限公司 无线链路失败相关测量信息的上报方法及系统
CN103200599A (zh) * 2012-01-06 2013-07-10 华为技术有限公司 传输数据的方法及设备
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US9838919B2 (en) 2009-02-20 2017-12-05 Huawei Technologies Co., Ltd. Method, apparatus, and system for detecting a radio network problem
US9838920B2 (en) 2009-02-20 2017-12-05 Huawei Technologies Co., Ltd. Method, apparatus, and system for detecting a radio network problem
US10986546B2 (en) 2009-02-20 2021-04-20 Huawei Technologies Co., Ltd. Method, apparatus, and system for detecting a radio network problem
CN102379137A (zh) * 2009-04-20 2012-03-14 华为技术有限公司 一种对消息完整性保护检查失败的处理方法、设备和系统
CN101848554A (zh) * 2010-05-19 2010-09-29 新邮通信设备有限公司 一种无线接口恢复方法和一种施主基站
CN101848554B (zh) * 2010-05-19 2012-09-05 新邮通信设备有限公司 一种无线接口恢复方法和一种施主基站
CN102448060A (zh) * 2010-09-30 2012-05-09 华为技术有限公司 一种密钥管理方法、检查授权方法和装置
CN102448060B (zh) * 2010-09-30 2015-08-05 华为技术有限公司 一种密钥管理方法、检查授权方法和装置
CN107371224A (zh) * 2017-07-18 2017-11-21 深圳天珑无线科技有限公司 一种无线通信设备连接信号的方法、设备以及存储装置

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CN101132611A (zh) 2008-02-27

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