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TDD accidental access method, system and its composition modules

A random access, time division duplex technology, applied in code division multiplexing systems, transmission systems, radio transmission systems, etc., can solve problems such as synchronization code interference, achieve interference avoidance, fast random access, and flexible allocation Effect

Active Publication Date: 2009-02-18
DATANG MOBILE COMM EQUIP CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] In view of this, one of the purposes of the present invention is to provide a method for allocating random access channels, which can solve the technical problem of the interference of the TS0 time slot and the DwPTS time slot of the remote cell to the random access preamble

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  • TDD accidental access method, system and its composition modules
  • TDD accidental access method, system and its composition modules
  • TDD accidental access method, system and its composition modules

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Embodiment Construction

[0065] The core idea of ​​the present invention is to redesign the structure of the random access channel so that the redesigned random access channel can be flexibly configured in the uplink channel under the condition that the uplink channel allocation can be performed, and the random access channel of this cell The sending position of the preamble sequence is far away from the time when the TS0 time slot and DwPTS time slot of the remote base station arrive at the local cell, so as to reduce the interference of the TS0 time slot and DwPTS time slot of the remote base station on the preamble sequence of the local cell as much as possible, thereby improving random access Channel detection success rate and UE access speed.

[0066] The present invention includes a blank area that does not send any data in the random access channel, and the blank area is used as the guard interval (GT) of the preamble sequence to eliminate the time uncertainty of the preamble sequence. Interfer...

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Abstract

The invention relates to a random access channel assignment method of a medium coverage system and a large coverage system in a TD-SCDMA evolution system based on the OFDM. The random access preamble sequence is able to be assigned at the back end of the up time slot as possible under the condition that bigger interference exists by adding a guard gap in the random access preamble sequence, thereby the technical problem that a TS0 time slot and a DwPTS time slot of the distal cell generate interference to self-cell random access preamble sequence in the medium coverage system and the large coverage system. The assignment of the random access channel is more flexible by using the invention, and the detection success probability of the preamble sequence from the base station is improved.

Description

technical field [0001] The present invention relates to the random access technology in the evolution system of Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) based on Orthogonal Frequency Division Multiplexing (OFDM), especially A time-division duplex random access method for medium coverage and large coverage systems, the system and its constituent modules. Background technique [0002] TD-SCDMA is the only international standard among the three major international standards of the third-generation mobile communication system that adopts time division duplex (TDD) mode and supports uplink and downlink asymmetric service transmission, and has greater flexibility in spectrum utilization. The system comprehensively adopts advanced technologies in wireless communication such as smart antenna, uplink synchronization, joint detection and software radio, so that the system has high performance and spectrum utilization. With the development of society and the ...

Claims

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Application Information

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IPC IPC(8): H04B7/216H04B1/707H04J13/00
CPCH04W74/002H04W74/0833H04J13/0059H04W28/04
Inventor 唐海索士强王立波
Owner DATANG MOBILE COMM EQUIP CO LTD
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