WO2009079817A1 - Procédé de transfert de station de base - Google Patents

Procédé de transfert de station de base Download PDF

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Publication number
WO2009079817A1
WO2009079817A1 PCT/CN2007/003555 CN2007003555W WO2009079817A1 WO 2009079817 A1 WO2009079817 A1 WO 2009079817A1 CN 2007003555 W CN2007003555 W CN 2007003555W WO 2009079817 A1 WO2009079817 A1 WO 2009079817A1
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WO
WIPO (PCT)
Prior art keywords
target cell
terminal
cell
handover
sends
Prior art date
Application number
PCT/CN2007/003555
Other languages
English (en)
Chinese (zh)
Inventor
Zhongda Du
Original Assignee
Zte Corporation
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 Corporation filed Critical Zte Corporation
Priority to PCT/CN2007/003555 priority Critical patent/WO2009079817A1/fr
Publication of WO2009079817A1 publication Critical patent/WO2009079817A1/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
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
    • 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
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data

Definitions

  • a distributed cellular wireless communication system mainly includes a terminal, a base station, and a core network.
  • the base stations may have logical connections or physical connections as needed.
  • the network composed of base stations is called a radio access network (RAN), and is responsible for access layer transactions, for example, management of radio resources.
  • RAN radio access network
  • the uplink and downlink radio resources are scheduled by the base station according to the shared channel.
  • Each base station can be connected to one or more core network nodes (CNs).
  • the core network is responsible for non-access layer transactions, such as mobility management.
  • a terminal is a device that can communicate with a network, such as a mobile phone or a laptop. Each terminal can only connect to one base station in the network in the uplink direction.
  • FIG. 2 is a handover procedure between base stations of the current LTE system. As shown in FIG. 2, the following specifically includes the following processing: Step 201: A terminal sends a measurement report to a source cell. The source cell determines that the handover needs to be performed according to the measurement report and the handover control policy, and selects the handover target cell. Step 202: The source cell sends a handover request to the target cell. After the target cell determines that the handover is allowed, the radio resource is prepared.
  • Step 203 The target cell sends a handover request acknowledgement to the source cell, where the message includes a handover command, where the command includes random access channel parameters on the target cell, etc.;
  • Step 204 source The cell sends a handover command to the terminal.
  • Step 205 After receiving the handover command, the terminal sends a random access preamble message on the random access channel of the target cell according to the handover command message.
  • Step 206 after receiving the random access preamble message, the target cell sends a random access response to the terminal;
  • Step 207 The terminal sends an handover complete message by using an uplink radio resource authorization provided in the random access response message.
  • the terminal maintains a wireless connection with the base station to which the source cell belongs before receiving the handover command, that is, the time synchronization between the terminal and the source base station is maintained.
  • the terminal After receiving the handover command, the terminal first disconnects the wireless connection with the source base station, then turns to the target base station to which the target cell belongs, and obtains frequency and downlink synchronization with the target cell, and then starts the random access procedure.
  • the terminal before initiating the random access preamble message, the terminal must first obtain the system time information of the target cell, that is, not only the frame boundary of the target cell but also the SFN (system frame number) information on the target cell. As shown in FIG.
  • the period of the random access channel of the target cell in the time domain is 20 ms (millisecond), and the length of the single frame of the Long Term Evolution (LTE) system is 10 ms, so that if the terminal initiates the random access preamble If the SFN of the target cell is not known, it is impossible to confirm whether there is a random access channel in the current radio frame. If the terminal transmits a random access preamble message on each radio frame, it may conflict with the scheduling of other terminals because The target base station may schedule the same or partially overlapping time-frequency domain resources to another terminal, because the target base station can always schedule the time-frequency domain radio resources that are not pre-configured to the random access channel to the other terminal.
  • LTE Long Term Evolution
  • Frequency hopping is a method of increasing frequency i or macro diversity. Radio resources are distributed according to a certain law in the frequency domain over time. As shown in FIG. 4, the random access channel time slot changes with time. Because the random access time slots have different positions in the frequency domain on different SFNs, the terminal must know the current SFN or the frequency hopping period. The law of change can know the variation of random access time slots in the frequency domain.
  • the system frame number SFN of the target cell itself or the information related to the SFN is obtained on the P-BCH (Primary System Message Block) of the cell.
  • P-BCH Primary System Message Block
  • This P-BCH occupies a fixed bandwidth in the middle of the cell carrier frequency in the frequency domain, and its content repeats in the time domain of 40 ms.
  • the P-BCH performs a blind retransmission of the physical layer every 10 ms.
  • the terminal can soft combine the received P-BCH content to obtain the final result, that is, the repetition within 40ms is to increase the macro diversity in the time domain (the process is similar to HARQ, but there is no ACK NACK feedback information) .
  • the position of the subframe in which the P-BCH is located on the radio frame is fixed. Because each time the blind hair is scrambled with different scrambling codes, when the terminal receives the P-BCH, The last 2 bits of the SFN can be obtained by identifying different scrambling codes to know that the received P-BCH is the first few blind bursts.
  • the terminal only knows the target cell after receiving the handover command, that is, the reading process that can start the target cell system time at the earliest is after step 203. Therefore, the process of reading and the process by which the terminal subsequently initiates random access are serial, so doing so will undoubtedly prolong the interruption time of the handover.
  • a main object of the present invention is to provide a base station handover scheme to solve the problem of long waiting time in a base station handover process in the related art.
  • a base station handover method is provided, which can be used in a distributed cellular wireless communication system including a terminal, a source cell, and a target cell.
  • the method includes: the terminal sends the measurement report to the source cell; if the source cell determines that the handover needs to be performed according to the measurement report, the source cell selects the target cell to be handed over, and sends the handover request to the target cell; and the source cell will pre-synchronize the command Sending to the terminal, notifying the terminal to read the system time information of the target cell; the target cell receiving the handover request, and in the case that the target cell allows the handover, the target cell prepares the radio resource, and sends a confirmation message to the source cell, where, the confirmation The message includes a handover instruction; the source cell sends the handover instruction to the terminal, and the terminal performs random access according to the handover instruction and the system time information of the target cell.
  • the terminal can read the system time information of the target cell without requiring an additional gap.
  • the source cell schedules the gap to the terminal, and the terminal reads the system time information of the target cell on the gap.
  • the terminal sends a random access preamble message on the random access channel of the target cell, and then sends a handover complete message to the target cell when receiving the response of the access preamble message from the target cell.
  • FIG. 1 is a block diagram of a distributed cellular wireless communication system according to the related art
  • FIG. 2 is a signaling flow chart of base station handover processing according to the related art
  • FIG. 3 is a single frame of a long term evolution system according to the related art
  • FIG. 4 is a schematic diagram of an example of a random access channel time slot variation law according to the related art
  • FIG. 1 is a block diagram of a distributed cellular wireless communication system according to the related art
  • FIG. 2 is a signaling flow chart of base station handover processing according to the related art
  • FIG. 3 is a single frame of a long term evolution system according to the related art
  • FIG. 4 is a schematic diagram of an example of a random access channel time slot variation law according to the related art
  • FIG. 1 is a block diagram of a distributed cellular wireless communication system according to the related art
  • FIG. 2 is a signaling flow chart of base station handover processing according to the related art
  • FIG. 3 is a single frame of a long term
  • a base station handover method is provided, which is applicable to a distributed cellular wireless communication system including a terminal, a source cell belonging to a source base station, and a subordinate The target cell of the target base station.
  • the source cell may send a message to the terminal when the handover decision is made.
  • the message includes the description information of the target cell, and after receiving the message, the terminal maintains the source and the source. Under the premise of the cell continuing communication, the system time of the target cell is started to be read.
  • the process of the terminal reading the target cell system time and the process of the source base station transmitting the handover request to the target cell on the X2 interface or the S1 interface are parallel, so it can be used to shorten the handover interruption time.
  • the base station handover method includes: Step S502: The terminal sends a measurement report to the source cell.
  • Step S504 In the case that the source cell determines that the handover is needed according to the measurement report, the source cell selects the handover.
  • the target cell sends a handover request to the target cell; and the source cell sends a pre-synchronization command to the terminal, notifying the terminal to read the system time information of the target cell;
  • Step S506 the target cell receives the handover request, and the handover is allowed in the target cell.
  • the target cell prepares a radio resource, and sends an acknowledgement message to the source cell, where the acknowledgement message includes a handover command.
  • Step S508 the source cell sends a handover command to the terminal, and the terminal according to the handover instruction and the system time information of the target cell. Perform random access.
  • the terminal can read the system time information of the target cell without requiring an additional gap.
  • the source cell obtains frame level synchronization information between the source cell and the target cell according to the measurement information or the cell synchronization mechanism, and estimates that the primary system message block of the target cell is in time.
  • the distribution rule on the domain, and the gap is scheduled to the terminal according to the distribution rule, the terminal temporarily leaves the source cell on the gap and reads the system time information of the target cell. This processing will be described later with reference to FIG.
  • the terminal when the terminal performs random access, the terminal sends a random access preamble message on the random access channel of the target cell, and then sends a handover complete message to the target cell when receiving the response of the access preamble message from the target cell.
  • the handover command includes at least a random access channel parameter on the target cell, and the terminal sends the random access preamble message according to the random access channel parameter.
  • the transmission of the pre-synchronization command and the transmission of the handover request are performed simultaneously or sequentially.
  • 6 is a signaling flow diagram of a base station handover method in accordance with the present invention. Similarly, the process shown in FIG.
  • Step 601 The terminal sends a measurement report to the source cell, where the source cell determines that the handover needs to be performed according to the measurement report and the handover control policy, and selects the target cell to be handed over;
  • Step 602 The source cell sends The pre-synchronization command message is sent to the terminal, and the terminal is required to start reading the system time information of the handover target cell, where the message includes the description information of the target cell.
  • Step 603 The source cell sends a handover request to the target cell.
  • the target cell prepares a radio resource after determining that the handover is allowed.
  • Step 604 The target cell sends a handover request acknowledgement to the source cell, where the message includes a handover command, where the handover command includes a random access channel parameter on the target cell, and the like.
  • the source cell sends a handover command to the terminal.
  • Step 606 After receiving the handover command, the terminal sends a handover command message to send a random access preamble message on the random access channel of the target cell.
  • Step 608 The terminal sends the handover complete message by using the uplink radio resource authorization provided in the random access response message.
  • Example 1 The signaling procedure for switching between intra-base stations and the same frequency base station can be as shown in Figure 6.
  • the description of the processing steps is the same as above.
  • the pre-synchronization handover command message in step 602 includes description information of the target cell.
  • the terminal can decode the system message of the target cell while maintaining communication with the source cell after receiving the message. If the terminal has not completed the reading process after receiving the handover command message, the terminal takes the source cell away and continues the reading process of the target cell system time.
  • Example 2 Inter-base station switching between frequencies As shown in FIG. 7, the processing of steps 701 to 708 is substantially the same as the processing of steps 601 to 608 in FIG.
  • the source cell may obtain the synchronization information of the frame level between the base stations according to the measurement information in step 701 or the synchronization mechanism between the base stations, thereby estimating the target cell P-BCH. Send the distribution law in the time domain. Then, according to this rule, a suitable gap is scheduled to the terminal, and the terminal can temporarily leave the source cell to decode the system message of the target cell. If the appropriate gap has been configured on the terminal before step 702, the steps may be omitted.
  • the process described above is directed to the case where the source cell and the target cell belong to different base stations, and when the source cell and the target cell belong to the same base station, the method according to the present invention can also be used to read the time of the target cell system in advance. The information is simply that there are no more switching requests and handover request confirmation messages in steps 603 and 604 in FIG. 6.
  • the inter-base station handover in the LTE system is divided into the ⁇ 2 interface switch and the S1 interface switch according to whether the switch signaling is exchanged on the ⁇ 2 interface
  • the ⁇ 2 interface switch refers to the exchange control between the source base station and the target base station directly through the ⁇ 2 interface in the handover preparation phase.
  • the signaling handover process, and the S1 interface handover refers to the exchange of control signaling between the source base station and the target base station through the mobility management entity ( ⁇ ) of the core network in the handover preparation phase, and the interface between the base station and the UI is S 1 . interface.
  • the present invention does not pay attention to which wireless interface exchanges handover signaling, so the above-mentioned example 1 and example 2, that is, the intra-frequency handover and the inter-frequency handover processing, the air interface flow for the ⁇ 2 interface switching and the S 1 interface switching Both apply.
  • the time required for base station handover can be effectively shortened, thereby improving the efficiency of base station handover.

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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 de transfert de station de base. Le procédé comprend les étapes suivantes : un terminal envoie un rapport de mesure à une cellule source ; la cellule source sélectionne une cellule objet à transférer et envoie une requête de transfert à la cellule objet au cas où la nécessité d'un transfert serait déterminée à partir du rapport de mesure ; la cellule source envoie une instruction de présynchronisation au terminal et demande à ce dernier de lire une information de temps système de la cellule objet ; la cellule objet reçoit la requête de transfert et, à condition que la cellule objet permette le transfert, celle-ci prépare une ressource sans fil et envoie un message d'accusé de réception à la cellule source. Le message d'accusé de réception comprend une instruction de transfert ; la cellule source envoie l'instruction de transfert au terminal, le terminal accède de manière aléatoire en fonction de l'instruction de transfert et de l'information de temps système de la cellule objet. Grâce à la présente invention, le temps nécessaire au transfert de la station de base peut être efficacement réduit ; en conséquence, l'efficacité du transfert de la station de base peut être améliorée.
PCT/CN2007/003555 2007-12-12 2007-12-12 Procédé de transfert de station de base WO2009079817A1 (fr)

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PCT/CN2007/003555 WO2009079817A1 (fr) 2007-12-12 2007-12-12 Procédé de transfert de station de base

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114339909A (zh) * 2021-11-02 2022-04-12 哲库科技(北京)有限公司 小区切换方法、装置及计算机可读存储介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1446009A (zh) * 2002-12-13 2003-10-01 大唐移动通信设备有限公司 一种移动通信系统中的切换方法
CN1735271A (zh) * 2005-06-30 2006-02-15 凯明信息科技股份有限公司 硬切换的方法和设备以及使用该方法和该设备的td－scdma系统
CN1747598A (zh) * 2005-08-12 2006-03-15 凯明信息科技股份有限公司 硬切换的方法和设备以及使用该方法和该设备的td－scdma系统
CN1774130A (zh) * 2005-08-31 2006-05-17 凯明信息科技股份有限公司 硬切换的方法和设备以及使用该方法和该设备的td－scdma系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1446009A (zh) * 2002-12-13 2003-10-01 大唐移动通信设备有限公司 一种移动通信系统中的切换方法
CN1735271A (zh) * 2005-06-30 2006-02-15 凯明信息科技股份有限公司 硬切换的方法和设备以及使用该方法和该设备的td－scdma系统
CN1747598A (zh) * 2005-08-12 2006-03-15 凯明信息科技股份有限公司 硬切换的方法和设备以及使用该方法和该设备的td－scdma系统
CN1774130A (zh) * 2005-08-31 2006-05-17 凯明信息科技股份有限公司 硬切换的方法和设备以及使用该方法和该设备的td－scdma系统

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114339909A (zh) * 2021-11-02 2022-04-12 哲库科技(北京)有限公司 小区切换方法、装置及计算机可读存储介质

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