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WO2008089688A1 - Procédé, dispositif et système de mesure du temps de transmission aller-retour - Google Patents

Procédé, dispositif et système de mesure du temps de transmission aller-retour Download PDF

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Publication number
WO2008089688A1
WO2008089688A1 PCT/CN2008/070130 CN2008070130W WO2008089688A1 WO 2008089688 A1 WO2008089688 A1 WO 2008089688A1 CN 2008070130 W CN2008070130 W CN 2008070130W WO 2008089688 A1 WO2008089688 A1 WO 2008089688A1
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WO
WIPO (PCT)
Prior art keywords
base station
terminal
positioning
message
information
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/CN2008/070130
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English (en)
Chinese (zh)
Inventor
Wenliang Liang
Jianjun Wu
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.)
Huawei Technologies Co Ltd
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 CNA2007101642231A external-priority patent/CN101232693A/zh
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2008089688A1 publication Critical patent/WO2008089688A1/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
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method, a device, and a wireless access system for measuring a Round Trip Delay (RTD) in a wireless system.
  • RTD Round Trip Delay
  • Ranging In a wireless communication system, in order to maintain the quality of a wireless communication link between a terminal and a network, a mechanism is needed to adjust parameters such as relative time, transmission power, and frequency offset of the terminal and the network. This process is called ranging. ( Ranging ).
  • OFDMA Orthogonal Frequency Division Multi Access
  • the terminal When the initial Ranging is applied to the initial access of the network, the terminal has synchronized the downlink data of the network, and obtains some configuration parameters of the uplink, but needs to randomly select the access slot and the CDMA codeword;
  • the purpose of periodic Ranging is to detect the change of the status of the wireless link. Once the status of the wireless link changes, the corresponding parameter adjustment needs to be made;
  • the Ranging in the handover process is similar to the initial Ranging, but it is possible that the target base station (BS) has pre-allocated the relevant Ranging resources to the terminal.
  • BS target base station
  • the initial Ranging based on contention is described as follows: 1.
  • the terminal synchronizes the downlink data of the BS, parses the uplink transmission parameters of the BS broadcast, and then A Ranging slot and a CDMA codeword are randomly selected and sent to the BS.
  • the BS After receiving the CDMA codeword, the BS cannot determine which terminal is transmitting the CDMA codeword, and only broadcasts one RNG-RSP (Ranging Response) message.
  • the RNG-RSP message includes the CDMA codeword and the Ranging slot in which the CDMA codeword is received. In this way, the terminal can use this information to determine whether the RNG-RSP is for itself.
  • the RNG-RSP message also includes some adjustment information on time, power, and frequency offset, and status information of Ranging.
  • the terminal needs to adjust according to the adjustment information in the RNG-RSP message, and then continue to transmit the CDMA codeword.
  • the BS also carries the CDMA-Allocation-IE (CDMA Allocation Information Element) in the transmitted UL-MAP (Uplink Resource Correspondence Table) message.
  • CDMA-Allocation-IE CDMA Allocation Information Element
  • the role of the CDMA-Allocation-IE is to indicate a physical resource that the terminal can use to send RNG-REQ (Ranging Request) messages.
  • the BS After receiving the RNG-REQ message, the BS responds with RNG-RSP, this time.
  • the RNG-RSP message contains a basic connection identifier (CID) assigned to the terminal.
  • CID basic connection identifier
  • the terminal maintains a clock, and the terminal must receive the RNG-RSP before the clock expires.
  • the Ranging process contains measurements of the RTD.
  • RTD measurements are important in network access, handover, and LoCation Services (LCS) positioning.
  • LCS LoCation Services
  • the RTD is measured to obtain the distance difference between the terminal and the two BSs, thereby calculating the current position of the terminal.
  • OTD Observed Time Difference Of Arrival
  • the RTD is measured to obtain the distance difference between the terminal and the two BSs, thereby calculating the current position of the terminal.
  • RTD Relative Time Difference
  • positioning between the terminal and the measurement base station can be performed by scanning.
  • the terminal and the neighboring base stations are required to perform the Ranging process, and the corresponding RTD is obtained and reported to the network side, and the network side according to the terminal.
  • the RTD value reported between the reported neighboring base stations locates the terminal, so the positioning speed is slow.
  • the measurement base station is The terminal allocates unnecessary related resources, which causes waste of resource allocation. Summary of the invention
  • Embodiments of the present invention provide methods, devices, and systems for measuring RTDs that improve positioning speed by indicating positioning scans.
  • An embodiment of the present invention provides a method for measuring a round trip delay, including:
  • the terminal receives the second message sent by the serving base station, where the second message carries the positioning indication information or carries the measured base station quantity information;
  • the terminal selects one or more base stations that implement positioning according to the positioning indication information as the measurement base station, or the terminal selects a corresponding number of base stations as the measurement base station according to the measured base station quantity information;
  • the terminal performs a ranging process with the selected measurement base station to obtain a round-trip delay RTD value between the terminal and the measurement base station.
  • An embodiment of the present invention provides a wireless access system, including a base station and a wireless terminal, where the base The station sends a second message to the wireless terminal, where the second message carries the location indication information or carries the measured base station quantity information;
  • the terminal selects one or more base stations that implement positioning as the measurement base station according to the positioning indication information; or selects a corresponding number of base stations as the measurement base station according to the measurement base station quantity information, and performs a ranging process with the selected measurement base station. And obtaining a round-trip delay RTD value between the terminal and the measurement base station.
  • An embodiment of the present invention provides a base station, including:
  • a first instruction unit configured to send a second message to the terminal, and carry the positioning indication information or the measurement base station quantity information
  • the first ranging unit is configured to perform a ranging process with the terminal.
  • the embodiment of the invention provides a wireless terminal, including:
  • a second instruction unit configured to receive a second message that is sent by the base station to carry the positioning indication information or measure the quantity information of the base station;
  • a second ranging unit configured to select one or more base stations that implement positioning according to the positioning indication information as a measurement base station; or select a corresponding number of base stations as measurement base stations according to the measured base station quantity information, and select the measured base station
  • the ranging process is performed to obtain a round-trip delay RTD value with the measurement base station.
  • the method, the device and the system for measuring the RTD provided by the embodiment of the present invention clearly indicate that the scanning is based on the positioning during the scanning process, and the terminal may select a corresponding number of base stations to perform the ranging process according to the positioning requirement, and therefore does not have to be associated with all neighboring base stations. After performing the ranging process, the RTD measurement results are reported to achieve a significant increase in positioning speed.
  • FIG. 1 is a schematic diagram of a signaling flow for performing RTD measurement by using a scanning process according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a base station according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a wireless terminal according to an embodiment of the present invention. detailed description
  • the serving base station sends a scan response (MOB-SCN-RSP) message to the terminal, and carries the positioning indication information or carries the measurement base station quantity information in the MOB-SCN-RSP message;
  • MOB-SCN-RSP scan response
  • the terminal selects one or more base stations that perform positioning according to the positioning indication information carried in the received MOB-SCN-RSP message as the measurement base station, or the terminal selects a corresponding number of base stations as the measurement base station according to the carried measurement base station quantity information;
  • the selected measurement base station performs a ranging process to obtain a round-trip delay RTD value between the terminal and the measurement base station.
  • Embodiment 1 The first message is sent by the terminal to the serving base station, and the positioning scan measurement RTD is started.
  • the specific signaling process is shown in Figure 1, including:
  • the terminal sends a first message to the serving base station.
  • the first message may be a scan request (MOB-SCN-REQ) message, and the location request information is carried in the MOB-SCN-REQ message, indicating that the scan is out. For the purpose of positioning.
  • the serving base station may determine the range of the measuring base station according to the determination, and measure the number of the base stations, and obtain some parameter information for speeding up the positioning scanning for the terminal. For example, the serving base station returns a MOB-SCN-RSP message to the terminal, and carries the number of base station information for performing the ranging process.
  • the candidate measurement base station list may also be carried, and the candidate measurement base station information is indicated in the candidate measurement base station list;
  • the terminal selects a corresponding number of base stations as the measurement base station according to the number of base stations sent by the serving base station; if the serving base station further sends the candidate measurement base station list, the terminal may select the measurement base station from the list of candidate measurement base stations, or may further The base station is selected from the base station whose signal strength is greater than the set threshold, and the terminal and the selected measurement base station perform ranging. Cheng.
  • the terminal and the measurement base station perform the ranging process, and carry the positioning indication information in the RMM-REQ message. After receiving the RNG-REQ with the positioning indication information, the measurement base station does not allocate resources to the terminal, for example: the uplink air interface resource and the basic connection identifier are not allocated to the terminal.
  • the terminal may also report the selected measurement base station to the serving base station; the serving base station separately notifies each measurement base station, and the ranging initiated by a certain terminal (which carries the terminal identifier in the notification message) is based on the positioning purpose. , the terminal does not need to be allocated resources allocated when accessing ranging.
  • the existing CDMA codeword may also be divided into a part of the CDMA codeword for positioning scanning, and the positioning indication information may be used to locate the scanned CDMA codeword.
  • the terminal transmits a CDMA codeword for positioning scanning to the measurement base station during the ranging process, and after receiving the CDMA codeword for the positioning scan, the measurement base station does not allocate the resource allocated for accessing the ranging. Or transmitting the CDMA codeword in the negotiated resource region for positioning, and measuring the CDMA codeword sent by the base station after receiving the resource region for positioning, the terminal is not allocated for the terminal when the access ranging is allocated. Resources.
  • the terminal reports the RTD value obtained by the measurement base station in the ranging process to the serving base station through the scan report (MOB-SCN-REP) message; or reports the service base station to the network side gateway or the network side.
  • the first information further carries the positioning interaction identifier information used to identify the positioning process.
  • Embodiment 2 The serving base station actively sends a second message to the terminal, indicating that the positioning scan is performed.
  • the difference between the second embodiment and the first embodiment is that the serving base station actively sends a second message to the terminal, for example, the serving base station actively sends the MOB-SCN-RSP to the terminal, or sends the paging broadcast MOB-PAG-ADV message.
  • the MOB-SCN-RSP message or the MOB-PAG-ADV carries the positioning indication information; the terminal selects one or more of the positioning indicators according to the positioning indication information.
  • the base station acts as a measurement base station.
  • the location indication information may only indicate that the purpose of the trigger scan is to locate, and may also specify the minimum number of base stations that need to be scanned.
  • the positioning indication information is a specific positioning method, for example, the serving base station is
  • the MOB-SCN-RSP message or the MOB-PAG-ADV message directly indicates the positioning method used for this positioning, such as the Cell-ID/RTD method or the OTDOA method.
  • the terminal After obtaining the specific positioning method information, the terminal determines the number of base stations scanned according to the positioning method. If cell-ID/RTD positioning is indicated, scanning can be stopped after scanning one base station; if OTDOA positioning is used, the terminal will stop scanning at least after scanning 3 base stations.
  • the positioning indication information may also be positioning accuracy information, and the terminal determines the number of scanning base stations according to the positioning accuracy requirement sent by the serving base station.
  • the mapping method and the correspondence between the positioning accuracy and the number of scanning base stations can be negotiated by the network side and the terminal during the terminal accessing the network.
  • the terminal sends the mapping method configured by itself and the mapping between the positioning accuracy and the number of scanning base stations to the network side (if the terminal itself has This configuration information, this step is optional); the base station obtains the obtained (authentication process, or network configuration value) positioning method and the correspondence between the positioning accuracy and the number of scanning base stations and the information sent by the terminal (if the terminal configuration has been reported) ) to compare and determine a set of correspondences to send to the terminal.
  • the terminal and the measurement base station may perform a ranging process, and may send a CDMA codeword dedicated to the positioning scan to the measurement base station; or send the CDMA codeword in the negotiated specific resource region for positioning; or
  • the RNG-REQ message sent to the measurement base station carries the positioning indication information, etc., indicating that the current ranging process is used for positioning.
  • the MOB-PAG-ADV message may also carry the candidate measurement base station list information; the terminal may select from the received candidate measurement base station list, or may further select the measurement base station to perform from the base station whose signal strength is greater than the set threshold value. Ranging process.
  • the second information further carries the positioning interaction identifier information used to identify the positioning process.
  • the terminal may select a corresponding number of base stations to perform ranging according to the positioning requirement.
  • the process does not have to report the RTD measurement result after performing the ranging process with all the neighboring base stations, so that the positioning speed can be improved.
  • the measurement base station since the measurement base station can clearly know that the purpose of the current scan is based on the location scan, the terminal is not allocated resources allocated when accessing the ranging. It not only saves unnecessary resource allocation process, but also improves the utilization of network resources.
  • the present invention provides a wireless access system, including a base station and a wireless terminal. among them:
  • the base station sends a second message to the wireless terminal, where the second message carries the positioning indication information or carries the measured base station quantity information, for example, the second message includes a MOB-SCN-RSP message or a MOB-PAG-ADV message;
  • the terminal selects one or more base stations that implement positioning as the measurement base station according to the positioning indication information; or selects a corresponding number of base stations as the measurement base station according to the measured base station quantity information, and performs measurement with the selected measurement base station. From the process, the round-trip delay RTD value between the terminal and the measurement base station is obtained.
  • the second message sent by the base station to the terminal may further carry the candidate measurement base station information; the terminal may select a measurement from the candidate measurement base station, or may further select a base station whose signal strength is greater than a set threshold.
  • the base station performs a ranging process.
  • FIG. 2 A schematic diagram of a specific functional structure of the base station is shown in FIG. 2, including:
  • a first instruction unit configured to send a second message to the terminal, carrying the positioning indication information or measuring the number of base station information, for example, the second message includes a MOB-SCN-RSP message or a MOB-PAG-ADV message; a first ranging unit, configured to perform a ranging process with the terminal;
  • it also includes:
  • a first receiving unit configured to receive a round-trip delay between the terminal reported by the terminal and the measurement base station
  • the specific functional structure diagram of the wireless terminal is shown in FIG. 3, and includes:
  • a second instruction unit configured to receive a second message that is sent by the base station to carry the positioning indication information or the quantity of the base station, for example, the second message includes a MOB-SCN-RSP message or a MOB-PAG-ADV message;
  • a second ranging unit configured to select one or more base stations that implement positioning according to the positioning indication information as a measurement base station; or select a corresponding number of base stations as measurement base stations according to the measured base station quantity information, and select the Measuring a base station performing ranging process, and acquiring a round-trip delay RTD value between the base station and the measuring base station;
  • it also includes:
  • a second reporting unit configured to report an RTD value obtained by the measurement base station during ranging, for example, by using an RTD value obtained by each measurement base station in the ranging process on the MOB-SCN-REP message;
  • it also includes:
  • a second sending unit configured to send, to the serving base station, a first message that carries the positioning request information, for example, the first message includes a MOB-SCN-REQ message.
  • the method, device, and system for measuring an RTD provided by the embodiments of the present invention clearly indicate that the scanning is based on positioning during the scanning process, and the terminal may select a corresponding number of base stations to perform a ranging process according to the positioning requirement, since it is not necessary to All neighboring base stations report the RTD measurement result after performing the ranging process, thereby significantly improving the positioning speed.
  • the spirit and scope of the Ming Thus, it is intended that the present invention cover the modifications and variations of the inventions

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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, un dispositif et un système de mesure du temps de transmission aller-retour. Le procédé se déroule de la manière suivante: un terminal reçoit le second message provenant d'une station de base de service, ce second message contenant des informations indiquant la position ou des informations relatives au nombre de stations de base de mesure; le terminal choisit au moins une station de base qui peut atteindre la position et agir en tant que station de base de mesure sur la base des informations indiquant la position ou bien le terminal choisit des stations de base d'un nombre correspondant pour faire office de stations de base de mesure sur la base des informations relatives au nombre de stations de base de mesure; le terminal et la station de base choisie réalisent un processus de télémétrie et obtiennent une valeur de temps de transmission aller-retour (TTAR) entre le terminal et la station de base de mesure. Dans le procédé selon l'invention, le dispositif et le système de mesure du TTAR, étant donné que le balayage est défini sur la base de la position dans le processus de balayage, le terminal peut choisir des stations de base d'un nombre correspondant pour réaliser le procédé de télémétrie sur la base d'une exigence de position et étant donné qu'il n'y a pas à établir de rapport concernant le résultat de la mesure TTAR après la réalisation des procédés de mesure de la distance avec la totalité de stations de base consécutives, ceci augmente la vitesse de positionnement de manière observable.
PCT/CN2008/070130 2007-01-22 2008-01-17 Procédé, dispositif et système de mesure du temps de transmission aller-retour Ceased WO2008089688A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200710002450.4 2007-01-22
CN200710002450 2007-01-22
CN200710164223.1 2007-09-30
CNA2007101642231A CN101232693A (zh) 2007-01-22 2007-09-30 一种测量往返时延的方法、设备及系统

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WO2008089688A1 true WO2008089688A1 (fr) 2008-07-31

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PCT/CN2008/070130 Ceased WO2008089688A1 (fr) 2007-01-22 2008-01-17 Procédé, dispositif et système de mesure du temps de transmission aller-retour

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1434305A (zh) * 2002-01-24 2003-08-06 华为技术有限公司 一种移动台定位测量的方法
CN1612638A (zh) * 2003-10-31 2005-05-04 三星电子株式会社 用于由移动通信网络中的转发器决定时间延迟的方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1434305A (zh) * 2002-01-24 2003-08-06 华为技术有限公司 一种移动台定位测量的方法
CN1612638A (zh) * 2003-10-31 2005-05-04 三星电子株式会社 用于由移动通信网络中的转发器决定时间延迟的方法

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