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Random access preamble having multiple Zadoff-Chu sequence for cellular telephone system

A preamble and sequence technology, applied in the transmission system, modulated carrier system, digital transmission system, etc.

Inactive Publication Date: 2009-03-25
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Other embodiments may identify random access attempts in other ways

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  • Random access preamble having multiple Zadoff-Chu sequence for cellular telephone system
  • Random access preamble having multiple Zadoff-Chu sequence for cellular telephone system
  • Random access preamble having multiple Zadoff-Chu sequence for cellular telephone system

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Embodiment Construction

[0014] In the following description, the scope of the term "some embodiments" is not limited to mean more than one embodiment, but the scope may include one embodiment, more than one embodiment, or all embodiments.

[0015] Before describing the embodiments, the ZC sequence will be described. A ZC sequence of length N can be represented by {a u (k), k=0, 1, . . . , N-1} means, where u is an index number, u=0, 1, . . . , N-1, and may be called a sequence index number. ZC sequence {a u (k), k=0,1,...,N-1} can be generated by the following expression

[0016] a u ( k ) = exp ( - jπu k ( k + 1 ) N ) , k=0, 1, . . . , N-1....

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Abstract

The invention discloses a cellular telephone system, wherein random access channel burst pulse series are provided with a preamble which comprises two Zadoff-Chu sequences so as to lessen the Doppler frequency shift effect, and when a base station receives the random access channel burst pulse series, the cellular telephone system does division to the two sequences reacquired from the preamble of the received burst pulse series, so as to provide a factor sequence. As for some embodiments, the base station interrelates the factor sequence with the Zadoff-Chu sequences so as to identify the user equipment which sends the random access channel burst pulse series. Furthermore, the invention describes and claims other embodiments.

Description

technical field [0001] The present invention relates to communication systems, more particularly to cellular telephone systems, and more particularly to preambles for random access attempts in cellular telephone systems. Background technique [0002] Mobile cellular telephone systems reuse spectrum by dividing the spatial coverage into cells, each cell reusing the same spectrum. figure 1 This is illustrated in a simplified manner, unit 102 is shown with base station (BS) 104 and user equipment (UE) 106A, 106B and 106C. In practice, a UE is a communication device using cellular telephony technology, such as a cellular phone, or a computer with a wireless card. A UE may be stationary or in a mobile vehicle. For simplicity, only three UEs are shown in cell 102, but in practice there may be many more such devices within any single cell. [0003] Various signaling schemes can be employed for multiple UEs to share a cell to communicate with the BS in that cell. Examples includ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04B1/707H04L29/06H04Q7/38H04J13/00
CPCH04J11/005H04L5/0007H04W74/08H04L27/2613H04L5/005H04L27/2662H04J13/0062
Inventor 张晓博马霓邬钢
Owner NXP BV
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