WO2008089691A1 - Method, device and system for measuring round-trip delay - Google Patents

Abstract

A method, device and system for measuring a round-trip delay are provided. The method includes that a corresponding pre-estimating forward time for activating the ranging of a terminal and a measuring base station is determined; a ranging process between the terminal and the measuring base station is activated based on the corresponding pre-estimating forward time; a round-trip delay RTD value between the measuring base station and the terminal is obtained based on the pre-estimating forward time and the ranging process. By the provided method for measuring the round-trip delay, the measuring base station can calculate the RTD value in Ranging process based on the pre-estimating forward time and a corresponding time adjustment value when the ranging achieves a success state; and the problems in the available prior art are overcome that only terminal can know RTD first, and the RTD measuring result can be reported to the network side only by the terminal.

Description

 Method, device and system for measuring round trip delay

Technical field

 The present invention relates to the field of wireless communications, and in particular, to a method and a corresponding device and system for measuring a Round Trip Delay (RTD) in a wireless system. Background technique

 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 ). In the Orthogonal Frequency Division Multi Access (OFDMA) system, there are three types of Ranging:

 1) initial Ranging based on competition;

 2) periodic Ranging;

 3) Ranging during the switching process.

 The most basic difference between the three Ranging methods is that the CDMA codes used come from different sets.

 When the initial Ranging is applied to the initial access of the network, the terminal has synchronized the downlink data of the network, and obtained some configuration parameters of the uplink, but needs to randomly select the access time 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.

 In the current WiMax system, the initial Ranging based on the competition 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 randomly selects a Ranging time slot and a CDMA codeword, and sends the signal to the BS. 2. 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.

 3. If the RNG-RSP message indicates that the status information of Ranging is continue, the terminal needs to adjust according to the adjustment information in the RNG-RSP message, and then continue to transmit the CDMA codeword.

 4. If the RNG-RSP message indicates that the status information of the Ranging is successful (success), the BS also carries the 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.

 5. After receiving the RNG-REQ message, the BS responds with RNG-RSP. This RNG-RSP message contains a basic connection identifier (CID) assigned to the terminal. The initial Ranging is over.

 6. 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. When the network is connected and switched, if the RTD is not measured, the uplink data cannot be transmitted. Since there may be more than 4 terminals in a BS, and the distance between each terminal and the BS is different, the time at which each terminal signal arrives at the BS is different. Therefore, both the terminal and the BS are required to know the current RTD between the terminal and the BS, so that the time axes at both ends can be freely converted. RTD is a very important parameter when positioning LCS. It defines the distance from the terminal to the BS. In the Observed Time Difference Of Arrival (OTDOA) positioning method, the RTD is measured to obtain the distance difference between the terminal and the two BSs, thereby calculating the current position of the terminal. In the cell identification (Cell-ID) / Relative Time Difference (RTD) positioning mode, After determining the cell where the terminal is located, if the RTD is known, the positioning area can be reduced from one cell to a ring equidistant from the BS, thereby achieving the effect of increasing the positioning accuracy.

 In the above prior art, only the terminal can calculate the RTD between the measurement and the base station through the ranging process, and the network side needs to wait for the terminal to report the RTD value to learn the RTD between the terminal and the terminal. The RTD generates a delay, which reduces the processing performance of the entire wireless network. SUMMARY OF THE INVENTION Embodiments of the present invention provide a method, device, and system for measuring a round-trip delay, by determining a corresponding estimated advance time of a measurement ranging from a measurement base station, so that a measurement base station, a serving base station, or another access service network entity can also Calculate the RTD value.

 An embodiment of the present invention provides a method for measuring a round trip delay, including:

 Determining a corresponding estimated lead time of the terminal and the measurement base station to trigger ranging;

 And triggering a ranging process between the terminal and the measurement base station according to the estimated estimated advance time; obtaining a round-trip delay RTD between the measurement base station and the terminal according to the estimated advance time and the ranging process value.

 An embodiment of the present invention provides an access service network entity, including:

 a first instruction unit, configured to determine estimated lead time information of the triggered ranging, and send the information to the wireless terminal;

 And a first ranging unit, configured to perform a ranging process with the wireless terminal, and acquire a round-trip delay RTD value between the measurement base station and the wireless terminal according to the estimated advance time and the ranging process.

 The embodiment of the invention provides a wireless terminal, including:

 a second instruction unit, configured to receive estimated advance time information of the triggered ranging sent by the base station or other access service network entity;

 And a second ranging unit, configured to trigger a ranging process to the measurement base station according to a corresponding estimated advance time.

An embodiment of the present invention provides a wireless access system, including a base station and a wireless terminal, where the base station is configured to determine estimated lead time information of a triggered ranging, and send the information to the wireless terminal; And performing a ranging process with the wireless terminal, and acquiring a round-trip delay RTD value with the wireless terminal according to the estimated advance time and ranging process;

 The wireless terminal is configured to receive the estimated advance time information sent by the base station, and trigger a ranging process according to the estimated advance time and the base station.

 The embodiment of the present invention further provides a wireless access system, including other access service network entities, base stations, and wireless terminals;

 The other access service network entity is configured to determine an estimated advance time of the triggered ranging, and send the estimated time to the base station;

 The base station is configured to forward the estimated advance time information determined by the other access service network entity to the terminal, and perform a ranging process with the wireless terminal, and refer to the other access according to the determined prediction Service network entity;

 The wireless terminal is configured to receive the estimated advance time information sent by the base station, and trigger a ranging process to the base station according to the corresponding estimated advance time.

 The embodiment of the invention further provides a wireless access system, including other access service network entities, base stations and wireless terminals;

 The other access service network entity is configured to determine a corresponding estimated advance time information of the triggered ranging, and send the information to the base station, and receive a time adjustment value reported by the base station, and according to the determined estimated advance time. And calculating, by the time adjustment value reported by the base station, a round-trip delay RTD value between the base station and the terminal;

 The base station is configured to forward the estimated advance time information determined by the other access service network entity to the terminal, and perform a ranging process with the wireless terminal, and adjust a time adjustment value when the terminal ranging to a successful state Reporting to the other access service network entity;

 The wireless terminal is configured to receive estimated advance time information sent by the base station, and trigger a ranging process according to the estimated estimated advance time.

In the embodiment of the present invention, the terminal determines the corresponding estimated advance time of the measurement ranging from the measurement base station, and the terminal triggers the ranging process according to the corresponding estimated advance time to each measurement base station; The station or other access service network entity calculates the RTD value between the terminal and the measurement base station according to the corresponding estimated advance time and ranging process. Overcoming the problem that only the terminal can know the RTD first in the prior art, the RTD measurement result can only be reported to the network side by the terminal. DRAWINGS

 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 an access service network entity 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 technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. The method for measuring round-trip delay provided by the embodiment of the present invention includes:

 Determining a corresponding estimated advance time with the measurement base station triggering the ranging, the terminal triggers the ranging process according to the corresponding estimated advance time to each measurement base station, and obtains a round trip time with the terminal according to the corresponding estimated advance time and the ranging process. Delay RTD value. Example 1:

 The terminal initiates a scan request to initiate a scan process for RTD measurement, and the terminal interacts with the serving base station to determine a corresponding estimated advance time of the terminal and the measurement base station to trigger ranging; or the terminal and the serving base station, the serving base station, and the measurement base station determine an estimated advance time.

 Referring to Figure 1, the specific steps include:

The terminal sends the first message to the serving base station. In the first embodiment, the first message is a scan request MOB-SCN-REQ message, and the MOB-SCN-REQ message carries a list of candidate measurement base stations selected by the terminal (for description Conveniently, the list of candidate measurement base stations that the terminal sends to the serving base station is hereinafter referred to as a "first candidate measurement base station list", and the candidate measurement base station is designated in the "first candidate measurement base station list" and the CDMA codeword is first transmitted to correspond. Base station estimated lead time information, and services Base station negotiation; for example: "The list of first candidate measurement base stations" is as shown in Table 1 below:

 Table 1

表 1 中的预估提前时间仅为举例， 实际中终端可以根据获取的各相邻基 站信息， 按照相应的算法进行提前时间的预估计算。 具体计算方式可以采用 现有技术中的各种方式， 本发明对此不作限定。

The estimated lead time in Table 1 is only an example. In practice, the terminal can calculate the advance time according to the obtained algorithm according to the obtained neighboring base station information. The specific calculation method can adopt various methods in the prior art, and the present invention does not limit this.

 2. After receiving the MOB-SCN-REQ message, the serving base station sends a second message to the terminal. In the first embodiment, the second message is a scan response MOB-SCN-RSP message. If the serving base station agrees to the measurement base stations specified by the terminal in the "first candidate measurement base station list" and the estimated advance time information thereof, the candidate measurement base station and the corresponding estimation may not be carried in the MOB-SCN-RSP message. The advance time information carries only the specified information of the consent terminal; or directly carries the "first candidate measurement base station list" sent by the terminal to the serving base station in the MOB-SCN-RSP message. If the serving base station disagrees with each measurement base station specified by the terminal in the "first candidate measurement base station list" and its estimated advance time information, the MOB-SCN-RSP message carries a self-modified candidate measurement base station list (for description Conveniently, the candidate measurement base station list determined by the base station is hereinafter referred to as a “second candidate measurement base station list”, and the candidate measurement base station and the required terminal are first transmitted in the “second candidate measurement base station list” to first transmit the CDMA codeword to the corresponding The base station triggers the advance time of the ranging process.

 In this step, the serving base station determines the estimated lead time after receiving the MOB-SCN-REQ, including:

 Manner 1: The serving base station requests an estimated lead time from the measurement base station; specifically:

Determining the measurement base station by the serving base station, and requesting an estimated advance time from each measurement base station; each measurement base station autonomously determines its own estimated advance time and returns to the serving base station; the serving base station will each The estimated advance time returned by the measurement base station is written in the "second candidate measurement base station list"; mode 2: the corresponding estimated advance time of each measurement base station is determined by the serving base station;

 The serving base station determines the corresponding estimated advance time of each measurement base station and writes it into the "second candidate measurement base station list"; optionally, the serving base station may also notify the corresponding measurement base station of the determined estimated advance time.

 The estimated advance time determined by the measurement base station or the serving base station may be a preset value, or may be calculated by the physical layer according to a certain algorithm, or determined according to the positional relationship between the terminal and the measurement base station or the serving base station.

 3. After receiving the MOB-SCN-RSP message, the terminal selects from the "first candidate base station list" or

The measurement base station is selected in the "second candidate measurement base station list". After the measurement base station determines, the terminal respectively transmits a randomly selected CDMA codeword to each selected measurement base station, and initiates a Ranging process with each measurement base station.

 In this step 3, the specific processing manners include:

 1), if the estimated advance time corresponding to the measurement base station is not returned to the serving base station by the measurement base station according to the request of the serving base station, or the serving base station determines the estimated advance time corresponding to each measurement base station, and does not notify each measurement base station. The measurement base station does not know the estimated advance time corresponding to the base station. In this case, in the Ranging process of the terminal and the measurement base station, the third message sent by the terminal to the measurement base station is used in the first embodiment. The ranging request message is sent to the corresponding measurement base station by the ranging request message carrying the estimated advance time information. The measurement base station calculates the RTD value through the ranging process and the estimated lead time obtained. Optionally, the ranging request message sent to the measurement base station may further carry a network entity identifier that needs to obtain an RTD value; so that the measurement base station sends the obtained RTD value to the corresponding network entity.

2), in the case that the measurement base station does not know the estimated advance time corresponding to the base station, the Ranging process of the terminal and the measurement base station may not send the estimated advance time to the measurement base station; the measurement base station succeeds in the state of Ranging, The service base station reports the time adjustment value during the Ranging process. The RTD value between the terminal and the measurement base station can be calculated by the serving base station according to the time adjustment value reported by the measurement base station and the estimated advance time corresponding to the measurement base station stored locally.

 3), if the serving base station has independently determined the estimated advance time corresponding to each measurement base station, and has separately notified each measurement base station, each measurement base station has obtained its own estimated estimated advance time, in this case, no longer It is required that the terminal sends the estimated advance time to the corresponding measurement base station in the Ranging process with the measurement base station. The measurement base station can calculate the RTD value with the terminal through the ranging process and the estimated advance time notified by the serving base station.

 The specific calculation formula of the RTD value is:

RTD=2 (Ding _3⁄4 estimated Shi T adjustment) Λ ( 1 )

 In equation (1), T is the estimated advance time corresponding to the measurement base station, and T is adjusted to the corresponding time adjustment value when Ranging reaches the success state.

 Optionally, each of the measurement base stations is configured to report the RTD value to the serving base station of the terminal when the Ranging is determined to be in a successful state, or report the calculated RTD value to the network side gateway or to the network side by each measurement base station. A network entity dedicated to positioning calculations.

 During the interaction between the terminal and the serving base station, the MOB-SCN-REQ and the MOB-SCN-RSP message may be negotiated to determine the estimated advance time transmission mechanism, and determine whether the estimated advance time is specifically sent by the serving base station to the measurement base station. The terminal sends to the measurement base station. As described above, if it is determined that the estimated advance time is sent by the serving base station to the measurement base station, the serving base station separately reports the estimated advance time corresponding to each measurement base station to each measurement base station; if it is determined that the terminal will pre- The estimated advance time is sent to the measurement base station, and the ranging request message sent by the terminal to the measurement base station may be carried to the measurement base station in the Ranging process of the terminal and the measurement base station. The specific negotiation method is as follows: The terminal indicates in the MOB-SCN-REQ that the terminal can notify the measurement base station of the estimated advance time through the ranging request RNG-REQ message, and when the serving base station returns to the MOB-SCN-RSP, indicates whether the terminal is in the measurement or not. After the base station performs the ranging, the RNG-REQ message carries the estimated advance time information.

Optionally, the terminal reports the RTD between the measurement base stations to the network side. In practice, during the interaction between the terminal and the serving base station's MOB-SCN-REQ and MOB-SCN-RSP messages, Whether the quotient needs the terminal to send a MOB-SCN-REP message to report the RTD measurement result. For example, the terminal indicates in the MOB-SCN-REQ that the terminal can report the measurement result through the MOB-SCN-REP. When the serving base station sends the MOB-SCN-RSP, it indicates whether the terminal needs to report the RTD with the MOB-SCN-REP after the scanning process. value. Example 2:

 The second message is sent by the serving base station to the terminal, and the second message carries the estimated advance time information determined by the serving base station or requested by the serving base station to the measurement base station.

 For example, in the process shown in FIG. 1 , the terminal sends a MOB-SCN-REQ message to the serving base station to start the scanning process. In practice, the serving base station may also meet other scanning trigger conditions. Sending the MOB-SCN-RSP message to the terminal; that is, even if the terminal does not send the MOB-SCN-REQ message to the serving base station, the serving base station may actively send the MOB-SCN-RSP message to the terminal as the second message, carrying the The second candidate measurement base station list, specifies the candidate measurement base station and the estimated advance time for the first base station to transmit the CDMA codeword to the corresponding base station to trigger the ranging process. After receiving the MOB-SCN-RSP message sent by the serving base station, the terminal selects the measurement base station to perform the Ranging process from the "second candidate measurement base station list".

 The manner in which the serving base station determines the estimated advance time of each measurement base station may also include: Method 1: The measurement base station is determined by the serving base station, and the estimated advance time is requested from each measurement base station; each measurement base station determines the estimated advance time autonomously, and returns To the serving base station; the serving base station writes the estimated advance time returned by each measurement base station into the "second candidate measurement base station list";

 Manner 2: The serving base station determines the corresponding estimated advance time of each measurement base station, and writes it into the "second candidate measurement base station list"; optionally, the serving base station may further notify the determined estimated advance time to the corresponding Measure the base station.

 The processing procedure after the terminal receives the MOB-SCN-RSP message is the same as that of the first embodiment, and will not be repeated.

In the foregoing Embodiment 2, the second message may also be a paging broadcast MOB-PAG-ADV message. Example 3:

 The terminal determines the measurement base station and the estimated advance time information autonomously, and performs the ranging process between the terminal and the measurement base station, and the terminal sends the estimated advance time information to the measurement base station in the third message sent to the measurement base station. .

 In the ranging process of the terminal and the measuring base station, the third message sent by the terminal to the measuring base station, in the third embodiment, the third message may be a ranging request message (RNG-REQ), that is, the ranging request message The estimated advance time information determined by the mobile terminal is sent to the corresponding measurement base station. Corresponding to the measured base station, when the ranging process with the terminal reaches a successful state, the RTD value can be calculated according to the obtained estimated advance time and time adjustment value.

 Optionally, the terminal may further carry a network entity identifier that needs to obtain an RTD value in the ranging request message sent to the measurement base station, and the measurement base station may further send the obtained RTD value to the corresponding network entity.

 Optionally, the terminal may further carry the positioning indication information in the ranging request message sent to the measurement base station, indicating that the current ranging process is used for positioning. The measurement base station parses the positioning indication information carried in the ranging request message, and knows that the purpose of the current scanning is for positioning, and the terminal does not need to allocate the resource allocated when the measurement is accessed. Example 4:

 The difference between Embodiment 4 and Embodiment 1, Embodiment 2 and Embodiment 3 above is that: the entity that determines the estimated time in advance and calculates the RTD may be other network entities accessing the service network, such as the access service gateway. The other access service network entities and the serving base stations of the terminals and the measurement base stations interact through the signaling of the access network.

 Taking the access service gateway as an example, the implementation method for determining the estimated time may be:

1. The access service gateway determines the corresponding estimated advance time information of each measurement base station, and sends all the measured base stations and their corresponding estimated advance time information to the serving base station, and then forwarded by the serving base station to Terminals; optionally, the access service gateway further sends the corresponding estimated advance time to each measurement base station;

 2. The serving base station transparently forwards or processes the estimated advance time set by the terminal, and then encapsulates it into other signaling formats and forwards it to the access service gateway. The access service gateway finally determines the estimated time of each measurement base station, and will eventually All the determined measurement base stations and their corresponding estimated advance time information are sent to the serving base station, and are forwarded by the serving base station to the terminal; optionally, the access service gateway further sends the corresponding estimated advance time to each measurement base station;

 3. The serving base station sends the estimated advance time information corresponding to each measured base station to the access service gateway, and the access service gateway finally determines the corresponding estimated advance time of each measurement base station, and all the measured base stations and Corresponding estimated advance time information is sent to the serving base station, and then forwarded by the serving base station to the terminal; optionally, the access service gateway further sends the corresponding estimated advance time to each measurement base station;

 4. The serving base station sends the received estimated advance time sent by the terminal and the autonomously set estimated advance time to the access service gateway, and the access service gateway finally determines the estimated time of each measurement base station, and all measurements are performed. The base station and its corresponding estimated advance time information are sent to the serving base station, and then forwarded by the serving base station to the terminal; optionally, the access service gateway further sends the corresponding estimated advance time to each measurement base station;

 5. The serving base station first requests the measurement base station to obtain the estimated advance time, and the measurement base station returns the corresponding estimated advance time to the serving base station, and the serving base station sends the estimated advance time returned by the measurement base station to the access service gateway, and the access service gateway Finalizing the estimated time of each measurement base station, and then transmitting it to the serving base station, and then forwarding the same to the terminal by the serving base station;

 6. The terminal determines each measurement base station, and performs a ranging process between the terminal and the measurement base station, and the terminal carries the estimated advance time information and the access service gateway information to the measurement in the third message sent to the measurement base station. The base station; each measurement base station sends the estimated advance time to the access service gateway through the signaling of the access network.

The way to calculate the RTD can be: 1), the measuring base station sends each adjustment time to the access service gateway, and then the access service gateway accumulates all the adjustment time, and calculates the RTD according to the estimated advance time corresponding to the measurement base station;

 2) The measurement base station accumulates all the adjustment time in the ranging process and sends it to the access service gateway, and then accesses the service gateway to calculate the RTD according to the estimated advance time corresponding to the measurement base station.

 In the foregoing embodiment 1, the second embodiment, the third embodiment, and the fourth embodiment, the estimated advance time information corresponding to each measurement base station is determined. (In the foregoing embodiment, the measurement base station may also include the serving base station, that is, the serving base station is Measure one of the base stations), so that the measurement base station or other network entity accessing the service network can calculate the RTD value. In the prior art, only the terminal can know the RTD first, and the RTD measurement result can only be reported by the terminal to the network side. The problem of delay.

 According to the RTD measurement method provided by the foregoing embodiment of the present invention, a schematic structural diagram of an access service network entity 20 is shown in FIG. 2, including:

 The first instruction unit 201 is configured to determine estimated lead time information of the triggered ranging, and send the information to the wireless terminal;

 The first ranging unit 202 is configured to perform a ranging process with the wireless terminal, and acquire a round-trip delay RTD value between the measurement base station and the wireless terminal according to the estimated advance time and the ranging process.

 Optionally, the access service network entity provided by the embodiment of the present invention further includes:

 The first reporting unit 203 is configured to report the obtained RTD value.

 The access service network entity provided by the embodiment of the present invention may be various functional entities in the radio access network, such as a base station.

 The embodiment of the present invention further provides a wireless terminal 30, which is shown in FIG. 3, and includes: a second instruction unit 301, configured to receive an estimated advance time of a triggered ranging sent by a base station or other access service network entity. Information

 The second ranging unit 302 is configured to trigger a ranging process to the measurement base station according to a corresponding estimated advance time.

Optionally, the wireless terminal provided by the embodiment of the present invention further includes: The second reporting unit 303 is configured to report the RTD value obtained during the ranging process.

 The embodiment of the present invention further provides a wireless access system, including a base station and a wireless terminal, where the base station is configured to determine estimated lead time information for trigger ranging, and send the information to the wireless terminal; The terminal performs a ranging process, and acquires a round-trip delay RTD value with the wireless terminal according to the estimated advance time and the ranging process;

 The wireless terminal is configured to receive the estimated advance time information sent by the base station, and trigger a ranging process according to the estimated advance time and the base station. The embodiment of the present invention further provides a wireless access system, including other access service network entities, base stations, and wireless terminals;

 The other access service network entity is configured to determine a corresponding estimated advance time of the triggered ranging, and send the same to the base station;

 The base station is configured to forward the estimated advance time information determined by the other access service network entity to the terminal, and perform a ranging process with the wireless terminal, and refer to the other access according to the determined prediction Service network entity;

 The wireless terminal is configured to receive the estimated advance time information sent by the base station, and trigger a ranging process to the base station according to the corresponding estimated advance time.

 The embodiment of the invention further provides a wireless access system, including other access service network entities, base stations and wireless terminals;

 The other access service network entity is configured to determine a corresponding estimated advance time information of the triggered ranging, and send the information to the base station, and receive a time adjustment value reported by the base station, and according to the determined estimated advance time. And calculating, by the time adjustment value reported by the base station, a round-trip delay RTD value between the base station and the terminal;

The base station is configured to forward the estimated advance time information determined by the other access service network entity to the terminal, and perform a ranging process with the wireless terminal, and the terminal distance measurement succeeds The time adjustment value of the state is reported to the other access service network entity;

 The wireless terminal is configured to receive estimated advance time information sent by the base station, and trigger a ranging process according to the estimated estimated advance time.

 In summary, the embodiment of the present invention determines, by the terminal, the serving base station, the measurement base station, and other access service network entities, corresponding estimated advance time information of the trigger ranging process between the terminal and each measurement base station, so that the measurement base station, The serving base station or other access service network entity can calculate the RTD value according to the estimated advance time and the corresponding time adjustment value when the Ranging reaches the successful state in the Ranging process. Overcoming the prior art, only the terminal can know the RTD first, The problem that the terminal reports the RTD measurement result to the network side. Therefore, the network side entity can obtain the RTD between the terminal and the terminal as soon as possible, and speed up the signaling interaction process between the terminal and the terminal. When the terminal does not perform RTD reporting, the terminal can also save the air interface resources occupied by the terminal through the air interface.

 A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The steps of the foregoing method embodiments are included; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

 It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request A method for measuring a round trip delay, characterized in that it comprises:  Determining a corresponding estimated lead time of the terminal and the measurement base station to trigger ranging;  And triggering a ranging process between the terminal and the measurement base station according to the estimated estimated advance time; obtaining a round-trip delay RTD between the measurement base station and the terminal according to the estimated advance time and the ranging process value.  The method according to claim 1, wherein the determining the estimated advance time of the terminal and the measuring base station triggering the ranging includes:  The estimated advance time is determined autonomously by the terminal; or  The estimated advance time is determined autonomously by the serving base station; or  Determining the estimated advance time by signaling interaction between the terminal and the serving base station; or  Determining the estimated advance time by signaling interaction between the terminal, the serving base station, and the measurement base station; or  The estimated advance time is determined by signaling interaction between the terminal, the serving base station, the measurement base station, and other access service network entities.  The method according to claim 2, wherein, after the terminal determines the estimated advance time autonomously, the method specifically includes:  The terminal triggers the ranging process between the measurement and the base station according to the determined estimated advance time; and transmits the estimated advance time information to the measurement base station by using the third message during the ranging process with the measurement base station;  The measuring base station obtains a round-trip delay RTD value with the terminal according to the estimated advance time and the ranging process sent by the terminal, and obtains the uplink and downlink RTD value.  The method according to claim 2, wherein, after the autonomously determining the estimated advance time by the serving base station, the method specifically includes: The serving base station sends the determined estimated advance time to the terminal by using the second message; The terminal triggers a ranging process between the measured base station and the measured base station according to the estimated advance time sent by the serving base station; and sends the estimated advance time information to the third message through the third message. Measuring the base station;  The measuring base station obtains a round-trip delay RTD value with the terminal according to the estimated advance time and the ranging process sent by the terminal, and obtains the uplink and downlink RTD value.  5. The method according to claim 4, wherein the second message is a scan response MOB-SCN-RSP message, or the second message is a paging broadcast MOB-PAG-ADV message.  The method according to claim 3, 4 or 5, wherein the third message is a ranging request message; the ranging request message further carries positioning indication information, indicating that the ranging process is Used for positioning.  The method according to claim 6, wherein the ranging request message further carries an access service network entity identifier that needs to obtain an RTD value; and the measurement base station sends the obtained RTD value to the location The access service network entity identifier corresponds to an access service network entity.  The method according to claim 2, wherein, after the autonomously determining the estimated advance time by the serving base station, the method specifically includes:  The serving base station sends the determined estimated advance time to the terminal and the measurement base station;  The terminal triggers a ranging process between the measured base station and the measured base station according to the estimated advance time sent by the serving base station;  The measurement base station reports the time adjustment value when the terminal ranging to a successful state to the serving base station according to the estimated advance time and the ranging process sent by the serving base station, where the measurement base station calculates The RTD value is derived.  The method according to claim 4 or 8, wherein before the sending the estimated estimated advance time information to the measurement base station, the method further comprises: The terminal negotiates with the serving base station to notify the corresponding measurement base station of the estimated advance time determined by the terminal or the serving base station. The method according to claim 2, wherein the determining, by the terminal, the signaling interaction between the terminal and the serving base station to determine the estimated advance time includes:  Transmitting, by the terminal, the first message to the serving base station, and carrying, in the first message, the measurement base station selected by the terminal and the corresponding estimated advance time information;  Determining, by the serving base station, the measurement base station selected by the terminal and the corresponding estimated advance time, and carrying the consent indication information in the second message returned to the terminal; or  The measurement base station determined by the serving base station and the corresponding estimated advance time information are carried in the second message returned to the terminal.  The method according to claim 10, wherein the first message is a scan request MOB-SCN-REQ message; and the second message is a scan response MOB-SCN-RSP message.  The method according to claim 10 or 11, wherein after determining the estimated advance time, the method specifically comprises:  The serving base station further sends the determined estimated advance time information to the measurement base station; the terminal triggers a ranging process between the measured base station and the measured base station according to the determined estimated advance time; the measurement base station sends according to the serving base station The estimated advance time and the ranging process, the time adjustment value obtained by the obtaining station and the terminal ranging to a successful state is given to the serving base station, and the RTD value is calculated by the serving base station.  The method according to claim 10 or 11, wherein after determining the estimated advance time, the method specifically comprises:  The terminal triggers a ranging process between the measured base station according to the determined estimated advance time; and performs the ranging process with the measuring base station, and sends the estimated advance time information to the Measuring base station; The measuring base station obtains a round-trip delay RTD value and the reported time between the terminal and the terminal according to the estimated advance time and the ranging process sent by the terminal; or the measuring base station reaches a successful state with the terminal ranging. Time adjustment value is reported to the serving base station, and is calculated by the serving base station The RTD value.  The method according to claim 13, wherein the third message is a ranging request message; the ranging request message further carries positioning indication information, indicating that the current ranging process is used for positioning.  The method according to claim 14, wherein the ranging request message further carries an access service network entity identifier that needs to obtain an RTD value; and the measuring base station sends the obtained RTD value to the The access service network entity identifier corresponds to an access service network entity.  The method according to claim 2, wherein the signaling interaction between the terminal, the serving base station, and the measurement base station determines the estimated advance time, which specifically includes:  Determining a measurement base station by the serving base station, and requesting an estimated advance time from the determined measurement base station;  The measuring base station returns an estimated advance time corresponding to itself to the serving base station;  The serving base station sends the estimated advance time returned by the measurement base station to the terminal.  The method according to claim 2, wherein the signaling interaction between the terminal, the serving base station, and the measurement base station determines the estimated advance time, which specifically includes:  Transmitting, by the terminal, a first message to a serving base station, and carrying, in the first message, a measurement base station selected by the terminal;  The serving base station requests an estimated lead time from the measurement base station;  The measuring base station returns an estimated advance time corresponding to itself to the serving base station;  The serving base station sends the estimated advance time information returned by the measurement base station to the terminal. The method according to claim 16 or 17, wherein after determining the estimated advance time, the method specifically comprises: The terminal triggers a ranging process between the measured base station and the measured base station according to the determined estimated advance time; the measuring base station obtains a round trip between the terminal and the terminal according to the estimated advance time and the ranging process The RTD value is extended and reported to the serving base station; or the measurement base station reports the time adjustment value when the terminal ranging to a successful state to the serving base station, where the serving base station calculates The RTD value is calculated.  The method according to claim 2, wherein the determining, by the terminal, the serving base station, the measurement base station, and the other access service network entity, the signaling advancement time, the method includes:  Determining an estimated advance time by the other access service network entity and transmitting to the measurement base station and the serving base station;  The serving base station forwards the determined estimated lead time to the terminal.  The method according to claim 2, wherein the determining, by the terminal, the serving base station, the measurement base station, and the other access service network entity, the signaling advancement time, the method includes:  Determining a measurement base station by the other access service network entity, and requesting an estimated advance time from the determined measurement base station;  The measuring base station returns an estimated advance time corresponding to itself to the other access service network entity;  The other access service network entity sends the estimated advance time returned by the measurement base station to the terminal through the serving base station.  The method according to claim 2, wherein the determining, by the terminal, the serving base station, the measurement base station, and the other access service network entity, the signaling advancement time, the method includes:  Determining, by the terminal, the measurement base station, and determining an estimated advance time corresponding to the measurement base station, and transmitting, by the serving base station, the determined measurement base station and its corresponding estimated advance time information to the other access service network Entity  And the other access service network entity notifies the measurement base station and transmits the estimated advance time corresponding to the measurement base station to the terminal through the serving base station; or And the other access service network entity requests an estimated advance time from the measurement base station; and sends, by the serving base station, the estimated advance time returned by the measurement base station to the terminal. The method according to claim 19, 20 or 21, wherein after determining the estimated advance time, the method specifically comprises:  The terminal triggers a ranging process between the measured base station and the measured base station according to the determined estimated advance time; the measuring base station obtains a round trip delay with the terminal according to the estimated advance time and the ranging process The RTD value is reported to the other access service network entity; or the measurement base station reports the time adjustment value when the terminal ranging to a successful state to the other access service network entity, and the other access service The network entity calculates the RTD value.  23. An access service network entity, comprising:  a first instruction unit, configured to determine estimated lead time information of the triggered ranging, and send the information to the wireless terminal;  And a first ranging unit, configured to perform a ranging process with the wireless terminal, and acquire a round-trip delay RTD value between the measurement base station and the wireless terminal according to the estimated advance time and the ranging process.  The access service network entity according to claim 23, further comprising: a first reporting unit, configured to report the obtained RTD value.  25. A wireless terminal, comprising:  a second instruction unit, configured to receive estimated advance time information of the triggered ranging sent by the base station or other access service network entity;  And a second ranging unit, configured to trigger a ranging process to the measurement base station according to a corresponding estimated advance time.  The wireless terminal of claim 25, further comprising:  And a second reporting unit, configured to report an RTD value obtained during the ranging process with each measurement base station. A wireless access system, comprising a base station and a wireless terminal, wherein the base station is configured to determine estimated lead time information for triggering ranging, and send the information to the wireless terminal; The terminal performs a ranging process, and acquires a round-trip delay RTD value with the wireless terminal according to the estimated advance time and the ranging process; The wireless terminal is configured to receive estimated advance time information sent by the base station; The estimated lead time and the base station trigger the ranging process.  The radio access system according to claim 27, wherein the base station is further configured to report the obtained RTD value with the wireless terminal.  A wireless access system, comprising: another access service network entity, a base station, and a wireless terminal;  The other access service network entity is configured to determine a corresponding estimated advance time of the triggered ranging, and send the same to the base station;  The base station is configured to forward the estimated advance time information determined by the other access service network entity to the terminal, and perform a ranging process with the wireless terminal, and refer to the other access according to the determined prediction Service network entity;  The wireless terminal is configured to receive the estimated advance time information sent by the base station, and trigger a ranging process to the base station according to the corresponding estimated advance time.  30. A wireless access system, comprising: another access service network entity, a base station, and a wireless terminal;  The other access service network entity is configured to determine a corresponding estimated advance time information of the triggered ranging, and send the information to the base station, and receive a time adjustment value reported by the base station, and according to the determined estimated advance time. And calculating, by the time adjustment value reported by the base station, a round-trip delay RTD value between the base station and the terminal;  The base station is configured to forward the estimated advance time information determined by the other access service network entity to the terminal, and perform a ranging process with the wireless terminal, and adjust a time adjustment value when the terminal ranging to a successful state Reporting to the other access service network entity;  The wireless terminal is configured to receive estimated advance time information sent by the base station, and trigger a ranging process according to the estimated estimated advance time.