Method for radio transmission using high-efficient high performance frame structure for wide-band TDD system

Abstract

This invention relates to a method for carrying out wireless transmission by TDD system with a high efficient and high performance frame including: dividing a sub-frame of a fixed time length into several basic time slots and several special time slots, in which, one basic time slot is used to downward transmit local area broadcast or bp information and the other basic time slots are used to transmit up and down service information, when needing to increase the transmission rate of single slots, the basic time slots are merged to several expanded time slots to use the high speed service matching the expanded time slot transmission with its length, which presents a development direction of the next three generations for the TDD system.

Description

technical field [0001] The present invention relates to broadband Time Division Duplex (TDD) mobile communication system technology, more precisely relates to time division synchronous code division multiple access (TD-SCDMA) mobile communication system when working in a wider frequency band, using a high efficiency and high The frame structure of performance realizes the method of wireless transmission. Background technique [0002] The current mobile communication system standard of the third-generation time-division duplex mode (refer to relevant standard documents of 3GPP) specifies two kinds of broadband carrier systems. One is the UTRA TDD (Universal Terrestrial Radio Access Time Division Duplex) system with a high chip rate (HCR), the rate is 3.84Mcps; the other is the TD-SCDMA system with a low chip rate (LCR), the rate is 1.28Mcps Mcps. TD-SCDMA system, due to the use of smart antenna technology, has the advantages of high spectrum utilization rate, has been widel...

AI Technical Summary

Problems solved by technology

Due to the low chip rate and limited wireless resources on each carrier, multiple carriers must be used in combination when transmitting services exceeding 2Mbps, resulting in complex terminal equipment and high cost; in mobile communication systems with a cellular structure In , the terminal may move to a position close to 3-6 base stations. At this time, in figure 1 In each cell served by each carrier as shown, the terminal may receive different codes on the DwPTS of each carrier, and the number may be the same as the number of base stations, such as 3-6 different codes, causing the terminal Difficult to handle when zone switching

[0007] The common disadvantage of the above-mentioned low chip rate TD-SCDMA system and the high chip rate UTRA TDD system is that the scrambling code length is the same as the code length when the spreading code is 16. Since the scrambling code length is too short, it will cause a very large The peak signal power and very poor in-band amplitude-frequency characteristics lead to an increase in the cost of radio frequency components; problems related to multi-carrier work per cell and cellular networking are not fully considered; transmission problems when the data transmission rate exceeds 2Mbps are not fully considered

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