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Locating method using loop time

A positioning method and loopback technology, applied in electrical components, wireless communication, etc., can solve problems such as inability to support RTT positioning function

Inactive Publication Date: 2010-06-23
HUAWEI TECH CO LTD
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Problems solved by technology

[0011] However, in the case of wide coverage, the radius of the cell may be greater than 68 kilometers, reaching hundreds of kilometers. At this time, if the quantization unit is 1 / 16chips, the RTT report value with a bit width of 15 bits will not be able to support the distance (greater than 68 kilometers) ) RTT related positioning function
For example, at a cell radius of 120 kilometers, the RTT measurement value corresponding to the transmission and reception time difference Rx-Tx value of 1024 is 120×1000 / 78.125×2+1024=4096chips, which exceeds the maximum range of 2924 that can be represented by the RTT measurement value, so it is limited application

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Embodiment Construction

[0031] The following is attached figure 1 The positioning method using the loopback time of the present invention is described in detail.

[0032] In the 3GPP 25.133 protocol, it is defined that the reporting range of RTT is 0 to 32767, the bit width of the RTT reported value is 15 bits, and the quantization unit is 0.0625chips. When the quantization unit of the RTT measurement value in the distance range remains unchanged, as the distance increases, the value of the quantization unit is increased, and the quantization unit of the RTT measurement value is set in sections to meet the application scenarios under wide coverage.

[0033] As shown in Table 1, it is the RTT reporting mapping table used in the Cell ID+RTT positioning process of the present invention. The RTT reporting mapping table includes three items: RTT reporting value, RTT measurement value and unit. Wherein, the RTT reported value ranges from 0 to 32767, and the RTT reported values ​​are arranged in the first ...

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Abstract

The invention discloses a positioning method by employing round trip time. The method comprises steps of: A. according to round trip time quantizing units set with sections, base station converts the round trip time measure value into round trip time reporting value and reports the reporting value to a wireless network controller; B. the wireless network controller positions terminals according to the measure result reported by the base station. The invention is characterized in that it employs round trip time to position; in the situation of keeping length of bites reported with round trip time (RTT) unchangeable, it can keep the quantizing units of RTT measure value in near distance unchangeable; it supports relative positioning in the range of area which radius is more than 68 kilometers.

Description

technical field [0001] The invention relates to positioning technology, in particular to a positioning method using loopback time. Background technique [0002] The third generation mobile communication standardization partnership project (3 rd Generation Partnership Project, 3GPP) defines three positioning methods, namely Cell ID (Cell ID), Observed Time Difference Of Arrival (Observed Time Difference Of Arrival, OTDOA) and Assisted Global Positioning Systems (Assisted Global Positioning Systems, A-GPS). [0003] Among them, both OTDOA and A-GPS put forward higher requirements on the network or mobile terminal. The former increases the cost of the network, and the latter increases the cost of the terminal. At the same time, A-GPS is also restricted by the environment of the terminal (UE). The positioning method of directly taking the Cell ID at the center of the cell is the easiest to implement, but the accuracy is also the worst. Therefore, the protocol also proposes an ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/10H04W64/00
Inventor 杨平
Owner HUAWEI TECH CO LTD