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Random access method base on frequency domain signal preprocess

A random access, frequency domain signal technology, applied in wireless communication, multi-frequency code system, baseband system components, etc., can solve the problem of incomplete application and achieve the effect of low success rate

Inactive Publication Date: 2012-09-26
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since OFDM technology uses orthogonal subcarriers to transmit information, this method is not completely suitable for systems using OFDM technology

Method used

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  • Random access method base on frequency domain signal preprocess
  • Random access method base on frequency domain signal preprocess
  • Random access method base on frequency domain signal preprocess

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Experimental program
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Embodiment Construction

[0031] The time division duplex (TDD) mobile communication system is based on time division duplex, that is, the downlink and uplink use the same frequency, which makes the downlink and uplink have similar wireless propagation environments. On the other hand, the channel impulse response is correlated within a certain time range, so the uplink channel impulse response and the downlink channel impulse response are also correlated within a certain time range, and can be considered similar.

[0032] The present invention utilizes the channel symmetry of the downlink and uplink in the TDD mobile communication system and the time correlation of the channel, proposes a signal preprocessing technology applied to user equipment, and applies this technology to the random In the access process, the success rate of system random access is improved through simple processing of the user equipment.

[0033] The preferred embodiments of the present invention will be described in detail below...

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Abstract

The invention discloses a random access method based on frequency domain signal pretreatment, which comprises: when judging a random access process needs to adopt frequency domain pretreatment according to correlation of downlink time slots, user equipment obtains channel information of random access time slots through estimation of downlink channels; the user equipment determines signal transmission time; the user equipment obtains frequency domain pretreatment parameters according to the channel information; the user equipment carries out frequency domain pretreatment of uplink access signals according to the parameters, and transmits the signals subjected to frequency domain pretreatment instead of the uplink access signals; and system equipment captures the uplink access signals and obtains adjustment quantity of the transmission time based on the uplink access signals, and the user equipment adjusts the transmission time of the uplink access signals based on the adjustment quantity feedback. The inventive method can accurately guide the user equipment to complete random access, thereby solving the low success ratio problem during the random access process due to multiple paths.

Description

technical field [0001] The invention relates to a mobile communication technology, in particular to a method for random access in a Time Division Duplex (TDD) mobile communication system using Orthogonal Frequency Division Multiple Access (OFDM) technology. Background technique [0002] For a communication system, especially a mobile communication system, it is the basis for correctly analyzing the interaction information that the receiver obtains the timing information of the received signal. In the uplink direction, in order to achieve synchronization or quasi-synchronization, the system needs to perform two steps of random access and synchronization control. The former is the basis of the latter, and also the prerequisite for the realization of system functions. If the multipath signal introduces interference, it will lead to misreading of user timing information, which will have a far-reaching impact on users under the channel condition of large delay extension, and eve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02H04W56/00H04W74/08
Inventor 丁美玲
Owner ZTE CORP