Mobile terminal random access method of TD-SCDMA system

A technology of TD-SCDMA and mobile terminals, which is applied in the field of random access of mobile terminals in the time-division synchronous code division multiple access system. The effect of increasing the number of random access attempts

Active Publication Date: 2012-05-09
CHINA ACADEMY OF INFORMATION & COMM
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0011] Due to the variability and complexity of the wireless communication environment and the interference and access collisions between different mobile terminals, the success rate of mobile terminals initiating random access for the first time is not very high.
The random access retra...

Method used

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  • Mobile terminal random access method of TD-SCDMA system
  • Mobile terminal random access method of TD-SCDMA system
  • Mobile terminal random access method of TD-SCDMA system

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Embodiment Construction

[0051] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0052] The TD-SCDMA system mobile terminal random access method of the present invention adjusts the transmission power of the signature sequence by recalculating the path loss when the random access fails, and initiates random access again according to the adjusted transmission power of the signature sequence , improving the success rate of random access of the mobile terminal.

[0053] figure 1 It is a flow diagram of random access of a TD-SCDMA system mobile terminal of the present invention, comprising the following steps:

[0054] Step 101: The mobile terminal completes downlink synchronization, reads system information, and stores relevant system parameters.

[0055] In this step, after completing the downlink synchronization, the mobile term...

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Abstract

The invention discloses a mobile terminal random access method of a TD-SCDMA system. The method comprises the steps of: adding a power climbing counter in a random access process; counting path loss again based on the values of the power climbing counter and a signature retransmission counter; adjusting a signature sequence emitting power; emitting the signature sequence to attempt to randomly access again based on the adjusted signature sequence emitting power, and therefore the success rate of randomly accessing the mobile terminal of the TD-SCDMA can be raised, and the user experience can be improved. In the method, a function control terminal of the timer is utilized to count the path loss and adjust the signature sequence emitting power so as to wait for a random delay to reduce continuous collision of the mobile terminal in accessing.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a random access method for a mobile terminal in a Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time Division-Synchronous Code Division Multiple Access) system. Background technique [0002] TD-SCDMA is one of the third-generation mobile communication space interface technical specifications officially released by the International Telecommunication Union (ITU). TD-SCDMA integrates the technical advantages of code division multiple access (CDMA), time division multiple access (TDMA) and frequency division multiple access (FDMA), and adopts smart antenna, joint detection, synchronous CDMA, low chip rate, multi-slot and Adaptive power adjustment technology is a mobile communication technology with large system capacity, high spectrum utilization rate and strong anti-interference ability. [0003] For TD-SCDMA, a CDMA system with time division sy...

Claims

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Application Information

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IPC IPC(8): H04W52/24H04W74/08
Inventor 朵灏来志京果敢
Owner CHINA ACADEMY OF INFORMATION & COMM
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