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Timing measurement method, system and apparatus

A timing measurement and timing technology, applied in the field of mobile communication, can solve the problems of unstable timing measurement and large timing error, and achieve the effect of improving the performance of wireless positioning algorithm

Active Publication Date: 2009-07-22
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The embodiments of the present invention provide a timing measurement method, system and device to solve the problems of unstable timing measurement and large timing errors caused by multipath fading in the prior art

Method used

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  • Timing measurement method, system and apparatus
  • Timing measurement method, system and apparatus

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Effect test

Embodiment 1

[0044] Embodiment 1. Process according to the processing threshold of the relevant power to obtain the first reliable path:

[0045] First, according to the existing implementation, the terminal obtains the relevant power according to the received signal obtained by analysis and the known transmitted signal: P(i)=|X(i)| 2 , i=1, 2, ..., L+N-1, wherein, X(i) is the shifted complex correlation signal obtained according to the received signal and the known transmitted signal, L is the length of the received signal, and N is The length of the sent signal.

[0046] The relevant power is affected by environmental factors and fading and contains some interference components. In order to remove these interference components, the following methods can be used in the calculation process:

[0047] For P(i), i=1, 2..., L+N-1, search for peak power P max , with Γ=P max *α is the power processing threshold, Γ is the threshold value, and α is the correction factor, which can be determined...

Embodiment 2

[0056] Embodiment 2. The method of obtaining the first reliable path according to the cumulative sum of related power:

[0057] First, according to the existing implementation, the terminal obtains the relevant power according to the received signal obtained by analysis and the known transmitted signal: P(i)=|X(i)| 2 , i=1, 2, ..., L+N-1, wherein, X(i) is the shifted complex correlation signal obtained according to the received signal and the known transmitted signal, L is the length of the received signal, and N is The length of the sent signal.

[0058] Calculate the cumulative power sum of the relevant power obtained by M consecutive calculations:

[0059] P cum sfn ( i ) = P ( i ) ...

Embodiment 3

[0067] Embodiment 3. According to the position of the maximum path of the received signal of the relevant power, the method of determining the first reliable path:

[0068] First, according to the existing implementation, the terminal obtains the relevant power according to the received signal obtained by analysis and the known transmitted signal: P(i)=|X(i)| 2 , i=1, 2,..., L+N-1, wherein, X(i) is the shifted complex correlation signal obtained according to the received signal and the known transmitted signal, L is the length of the received signal, and N is The length of the sent signal.

[0069] Similarly, because it is affected by environmental factors and contains some interference components, in order to remove these interference components, the following methods can be used in the calculation process:

[0070] Find the peak power P of P(i), i=1, 2..., L+N-1 max (i), determine the peak position i max . Then it is considered that the arrival time of the main path of t...

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Abstract

The invention discloses a timing measurement method comprising: determining a first reliable path position reaching to a terminal according to related power or channel impulse response power and determining a timing moment the terminal signal reaching according to the first reliable path position. Meanwhile, the invention also discloses a timing measurement system and apparatus. The invention adopts the first reliable path position reaching to the terminal to perform the timing measurement. Accordingly, when large time delay extended multiple paths are existed in the movable environment, or the transmitting terminal is used for obtaining the transmission diversity gain, and the multiple paths are brought by the incomplete synchronous a plurality of aerial transmitted signals, according tothe invention, relative stable timing measurement results can be obtained, and a minimum deviation value is provided between the timing measurement result and the actual value, thereby improving the wireless positioning algorithm performance by timing to perform the distance measurement form the UE to the base station in advance at a certain extent.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a timing measurement method, system and device. Background technique [0002] With the development of mobile communication technology, due to the needs of system synchronization and some mobile service applications, such as positioning services, the timing of the arriving signal is measured on the terminal side, and the timing advance is obtained, which is the delay of the base station sending the signal to the terminal (UE) , has become particularly important in many systems. For example, in the third-generation mobile communication standard Time Division-Synchronous Code Division Multipje Access (TD-SCDMA) system, in order to synchronize with the NodeB, the UE ensures that the signal sent by the NodeB just falls on the UE to receive Within the time window, and the UE’s sending signal falls within the receiving time window of NodeB, the UE must measure the arrival ...

Claims

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Application Information

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IPC IPC(8): H04B7/26
Inventor 任世岩孙长果吴柯维蔡月民石蕊
Owner DATANG MOBILE COMM EQUIP CO LTD
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