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Equipment and method for transmitting and receiving random access preamble

A device and leading technology, applied in the field of communication systems, which can solve problems such as high false alarm rate, incomplete DFO problem, detection error, etc.

Inactive Publication Date: 2011-04-27
ST ERICSSON SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high mobility UEs, the resulting DFO may cause unacceptable detection errors in the decoding of the ZC sequence, resulting in a high false alarm rate
Some repetition-based schemes have been proposed to improve detection performance, but it is believed that such schemes do not fully overcome the DFO problem, especially under relatively severe DFO conditions

Method used

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  • Equipment and method for transmitting and receiving random access preamble
  • Equipment and method for transmitting and receiving random access preamble
  • Equipment and method for transmitting and receiving random access preamble

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Embodiment Construction

[0024] The making and using of the presently preferred embodiments are discussed in detail below. It should be appreciated, however, that the present disclosure provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention.

[0025] In the following description, the scope of the term "certain embodiments" is not limited to mean more than one embodiment, but the scope may include one embodiment, more than one embodiment, or possibly all embodiments.

[0026] A ZC sequence of length N can be expressed as {au (k), k=0, 1, . . . , N-1}, where u is an index, u=0, 1, . . . , N-1, and may be called a sequence index. ZC sequence {a u (k), k=0, 1, ..., N-1} can be generated by the following expression

[0027] a u ( k ) ...

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Abstract

The invention provides equipment and a method for transmitting and receiving a random access preamble. The equipment comprises a physical layer for transmitting burst comprising the preamble. The preamble comprises a first Zadoff-Chu sequence and a second Zadoff-Chu sequence, and each sequence has the length of N. The first Zadoff-Chu sequence is a periodic sequence of a first sequence index, and the period of the periodic sequence is equal to N; and the second Zadoff-Chu sequence is a periodic sequence of a second sequence index, and the period of the periodic sequence is equal to N.

Description

technical field [0001] The present disclosure 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 reusing the same spectrum. figure 1 The situation is shown in a simplified manner, showing a cell 102 with a base station (BS) 104 and user equipments (UE) 106A, 106B and 106C. In practice, a UE is a communication device utilizing cellular telephony technology, such as a cellular telephone or a computer with a wireless card. A UE may be stationary, or may be in a moving vehicle. For simplicity, only three UEs are shown in cell 102, but in practice there will be a larger number of such devices within any single cell. [0003] Various signaling schemes may be employed to allow multiple UEs sharing a cell to communicate with a BS ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04L27/26
Inventor 张晓博马霓邬钢
Owner ST ERICSSON SA
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