Cell search method and equipment

A cell search and cell technology, applied in access restrictions, electrical components, synchronization devices, etc., can solve the problems of not providing technical solutions for FDD and TDD cell search, and achieve the effect of speeding up cell search and speeding up the access process

Active Publication Date: 2011-04-13
DATANG MOBILE COMM EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

[0033] The disadvantage of the prior art is that there is currently no technical solution for simultaneously providing FDD and TDD cell search in the communication system

Method used

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  • Cell search method and equipment

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Embodiment Construction

[0063] The inventor noticed in the course of the invention that, in addition to the difference in frame structure, other differences between FDD and TDD modes in LTE mainly exist in the difference in the duplex mode itself, that is, FDD uses continuous subframes to work, while TDD uplink or Downlink subframes are discontinuous in time, which leads to some differences in uplink and downlink scheduling and retransmission timing and control processes. However, other basic transmission technologies are exactly the same between FDD and TDD, which is also a further step for the two. Convergence provides conditions, that is, considering a fusion of FDD and TDD, a pair of TDD carriers with some characteristics supports UE access of both FDD and TDD systems at the same time. Be explained.

[0064] Figure 7 It is a schematic diagram of the implementation process of the cell search method, as shown in the figure, the following steps can be included in the cell search:

[0065] Step 70...

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Abstract

The invention discloses cell search method and equipment. The cell search method comprises the following steps that UE (User Equipment) searches a main synchronous signal; the UE searches more than one main synchronous signal relevant peak value position and corresponding main synchronous sequence in a relevant search window; the UE searches a secondary synchronous signal according to the relative position relationship of the main synchronous signal and the secondary synchronous signal specified in an FDD ((Frequency Division Duplex) protocol by one of the main synchronous signals and searches a secondary synchronous signal according to the relative position relationship of the main synchronous signal and the secondary synchronous signal specified in a TDD (Time Division Duplex) protocol by another main synchronous signal; if a relevant peak value of the secondary synchronous signals is found out, cell initial search is finished, and the corresponding secondary synchronous signal sequence is recognized; and otherwise, the secondary synchronous signal is searched according to the relative position relationship specified in another duplex mode protocol on the basis of the detecting position of the next main synchronous signal till the cell initial search is finished. The invention can improve the cell search speed when the synchronous signal and the synchronous sequence in two modes of FDD and TDD are simultaneously transmitted on the same carrier.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a cell search method and equipment. Background technique [0002] For a cellular mobile communication system, the duplex mode is the multiplexing mode of the uplink and downlink; and for the mobile communication device (base station or UE), the duplex mode is the multiplexing mode of the sending and receiving links. TDD (Time Division Duplex, Time Division Duplex) and FDD (Frequency Division Duplex, Frequency Division Duplex) are two basic duplex methods for wireless communication transmission, and both TDD and Long Term Evolution are supported in the LTE (Long Term Evolution) system FDD mode. The TDD mode means that the uplink and downlink use different time intervals for signal transmission; the FDD mode means that the uplink and downlink use different working frequency bands for uplink and downlink signal transmission. Duplex mode can refer to figure 1 and figure 2 , ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W48/16H04W56/00
CPCH04J11/0076H04W48/16
Inventor 潘学明胡金玲肖国军张杰王立波缪德山杨宇
Owner DATANG MOBILE COMM EQUIP CO LTD
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