Fast random switching in method used for upward special channel enhancement of WCDMA system

A dedicated channel and random access technology, applied in the direction of code division multiplexing system, multiplexing communication, wireless communication, etc., can solve the problem that the initial preamble transmission power and power do not take into account the fast random access of EUDCH users Questions such as requirements

Inactive Publication Date: 2004-11-24
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The current design of the initial preamble transmission power and power climbing step does not take into account the requirements of EUDCH users for fast random access, so it is necessary to improve the existing random access method for EUDCH users to speed up the successful completion of the random access process

Method used

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  • Fast random switching in method used for upward special channel enhancement of WCDMA system
  • Fast random switching in method used for upward special channel enhancement of WCDMA system
  • Fast random switching in method used for upward special channel enhancement of WCDMA system

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Embodiment

[0043] Operations on the network side:

[0044] figure 2 A flow chart of an operation cycle is given. For the present invention, the operation steps of the base station are as follows.

[0045] Step 1: Estimate the current uplink interference;

[0046] Step 2: Estimate the number of users who may use fast random access;

[0047] Step 3: According to the current uplink interference and the estimated value of the number of possible fast random access users, set the power offset of the enhanced user and the power climbing step of the enhanced user for the EUDCH user;

[0048] Step 4: Broadcast the power offset of the enhanced user and the step of power increase of the enhanced user to the mobile terminal through the system information 7.

[0049] Step five: After a period of time, return to step one. (that is, the power offset is set periodically)

[0050] Operations on the UE side:

[0051] 1. The operation of the upper layer of the UE side:

[0052] Such as image 3 As...

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Abstract

The quick random access method for upward special-purpose channel enhancement in wideband code division multiple address system includes the following steps: cyctically setting initial leading transmission power excursion quantity and power boosting step size for upward special-purpose channel enhancement by network terminal; according to the received initial leading transmission power excursion quantity and said power boosting step size respectively calculating initial leading transmission power for random access and leading transmission power of every time by mobile terminal. Said invention utilizes the above-mentioned power excursion quantity and larger power boosting step size to increase initial transmission power of random access process, increase probability of success of random access process, reduce time for making power detection and further reduce the time for random access.

Description

technical field [0001] The invention relates to the uplink dedicated channel enhancement of WCDMA (Wideband Code Division Multiple Access) of the third generation partnership project (3GPP), in particular to a fast random access method for uplink dedicated channel enhancement of the WCDMA system. Background technique [0002] figure 1 is a schematic diagram of the random access process. A mobile terminal (hereinafter referred to as UE) transmits a preamble in a selected uplink access time slot with a certain signature (signature) and initial preamble (preamble) transmission power. Afterwards, the UE waits for receiving access feedback on a corresponding downlink access time slot of an Acquisition Indicator Channel (AICH for short). If no feedback is received and the exit conditions of the random access procedure are still not satisfied, the UE will increase the transmission power of the preamble with the specified power climbing step size, and randomly select a signature i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005
CPCH04W52/367H04W52/50H04W52/146H04W52/362Y02B60/50H04W52/00
Inventor 阎桂霞张玉建杜高科李小强李周镐
Owner BEIJING SAMSUNG TELECOM R&D CENT
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