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Method for generating leader sequence and method for confirming cyclic shift

A technology of preamble sequence and cyclic shift amount, applied in multiplexing code generation, communication between multiple stations, electrical components, etc., to achieve the effect of simple and easy method

Active Publication Date: 2009-01-14
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, for the case of no cyclic shift restriction, according to the value formula of LTE unrestricted set cyclic shift, N CS If the value of is 0, then it doesn't make sense

Method used

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  • Method for generating leader sequence and method for confirming cyclic shift
  • Method for generating leader sequence and method for confirming cyclic shift

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Embodiment Construction

[0021] The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

[0022] The generation of the present invention is based on the following considerations:

[0023] Cyclic shift step size N CS The value of must not be smaller than the round trip time (RTT for short) and multipath delay spread multiplied by the sequence length and divided by the symbol time of the sequence. Detour time is the total time required for a signal to travel from the source to the destination and back to the source. The detour time is proportional to the radius of the cell. When the radius of the cell is larger, the detour time is longer, and the corresponding cyclic shift step size N is required. CS The value of will also become larger, so as to ensure that different cyclic shift sequences of the same ZC root sequence can be distinguished at the receiving end.

[0024] For the case where a root sequence can only generate ...

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Abstract

A method for generating leader and determining cyclic shift comprises that cyclic shift step length NCS equal to zero and corresponding cyclic shift C<v>=0, root sequence is directly used as leader when a root sequence can only generate a leader and has no limit for cyclic shift; cyclic shift step length N<CS>is unequal to zero, cyclic shift C<v>=v*N<CS> in which v=0, 1, 2 or the like, to N<ZC> / N<CS>-1, when a root sequence can generate several leader and has no cyclic shift limit. In the inventive method, a reasonable cyclic shift produce a leader for a root sequence, large cell coverage can be supported, method for generating leader is simple and practical.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for generating a preamble sequence and a method for determining a cyclic shift. 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, after the terminal is turned on, downlink synchronization is first performed, and then a broadcast channel (Broadcast Channel, BCH for short) detection is started. The base station notifies the terminal through the BCH channel of the index of the first ZC sequence that can be used by the RACH channel of the cell and the cyclic shift step size N CS , the terminal calculates the serial number of the corresponding ZC sequence according to the index...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04Q7/38
CPCH04J13/14H04J13/0062
Inventor 薛妍谭欢喜郝鹏郁光辉张峻峰
Owner ZTE CORP