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Method and apparatus for ranking ZC sequence of LTE TDD system RACH

A sequence sorting and ascending sorting technology, applied in the field of communication, can solve problems such as different coverage areas, lack of ZC sequence sorting, etc.

Inactive Publication Date: 2008-07-30
ZTE CORP
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Problems solved by technology

[0020] The present invention aims to provide a ZC sequence ordering method and device for LTE TDD system random access channel, to solve the above-mentioned lack of ZC sequence ordering in the prior art, resulting in different UEs using different ZC sequences in the same cell. The problem of coverage

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  • Method and apparatus for ranking ZC sequence of LTE TDD system RACH
  • Method and apparatus for ranking ZC sequence of LTE TDD system RACH
  • Method and apparatus for ranking ZC sequence of LTE TDD system RACH

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Embodiment Construction

[0064] The following takes the FDD mode of LTE as an example to describe the specific implementation manner of the present invention in detail.

[0065] Fig. 2 shows the flowchart of the ZC sequence sorting method according to the embodiment of the present invention, comprises the following steps:

[0066] Step S10, calculating the CM value of each ZC sequence;

[0067] Step S20, sorting each ZC sequence according to the CM value; and

[0068] Step S30, establishing the mapping relationship between the logical index and the physical index of each ZC sequence according to the sorting result.

[0069] The sorting results obtained by using this sorting method can enable operators to plan and allocate sequences according to the CM characteristics of the ZC sequence of the RACH of the LTE TDD system, and allocate sequences with similar CM values ​​to the same cell to ensure that mobile phones with different sequences are used in the same cell The PRACH has similar coverage, which...

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Abstract

The invention provides a ZC sequence sorting method and a device used for the random access channel of a Long Term Evolution Time Division Duplex (LTE TDD) system. The method comprises the following steps: calculating a CM value for each ZC sequence, sorting each ZC sequence according to the CM value; setting up a relationship mapping between the clustered and the non-clustered index of each ZC sequence according to the sorted sequence. The invention ensures a close coverage area of a Packet Random Access Channel (PRACH) using cell phones of difference sequence in the same cell, thus improving the flexibility of the cell planning.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a ZC sequence ordering method and device for random access channels of an LTE TDD system. Background technique [0002] In the Long Term Evolution (LTE for short) system, the Random Access Channel (RACH for short) uses the cyclic shift sequence of the Zadoff-Chu (ZC for short) sequence as the preamble, and the cyclic shift The sequence may also be called a Zero Correlation Zone (ZCZ for short) sequence. [0003] In an actual system, a user equipment (User Equipment, referred to as UE) such as a mobile phone first performs downlink synchronization after being turned on, and then starts to detect a broadcast channel (Broadcast Channel, referred to as BCH). The base station notifies the mobile phone of the logical index (Logical root sequence number) of the first ZC sequence that can be used by the RACH of the cell and the step size of the cyclic shift through the BCH, and the...

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Application Information

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IPC IPC(8): H04Q7/38H04B7/26
Inventor 郝鹏夏树强戴博梁春丽喻斌
Owner ZTE CORP
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