TDD system and its data transmission method

Abstract

The invention discloses a method for transmitting data of a time division duplex system. The method comprises the following steps: at least a special area configuration is set respectively and correspondingly against an incompatible TD-SCDMA system and a compatible TD-SCDMA system in advance; the special area configuration comprises lengths of a protective gap GP time slot, a DwPTS time slot and a UpPTS time slot with a symbol length as a unit; a base station determines all special area configurations in the corresponding set according to that, at present, whether a compatible TD-SCDMA system is required or not; and one of all the special area configurations is selected according to current coverage range and system performance requirement, and the selected special area configuration is transmitted to user equipment; the user equipment and the base station construct a wireless frame field for data transmission according to the selected special area configuration. The invention also discloses a time division duplex system. With the adoption of the invention, different rate coverage with finer granularity can be supported, wireless resources are saved, and transmission efficiency is improved.

Description

technical field [0001] The invention relates to a long-term evolution scheme of a time-division duplex system, in particular to a time-division duplex system and a data transmission method thereof. Background technique [0002] The third-generation mobile communication system (3G) adopts CDMA multiple access mode, supports multimedia services, and has high competitiveness. In order to ensure that such competitiveness is maintained in a longer period of time, the 3GPP has initiated a research project on Long Term Evolution (LTE) of 3G radio interface technology. [0003] Currently, the LTE system supports two types of frame structures. TD-SCDMA is the only standard that adopts time division duplex (TDD) among the three major international standards of the third generation mobile communication system. In the long-term evolution scheme of TD-SCDMA (LTE TDD), its preferred frame structure is the same as TD - The second type of frame structure compatible with SCDMA system, such...

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Problems solved by technology

[0011] When using the above method for data transmission, since the adjustment granularity of the GP length is one uplink time slot, when different levels of coverage are supported, the level difference between levels is relatively large, and the support for coverage is not flexible enough, resulting in waste of wireless resources. Small transfer efficiency

For example, for a cell with a coverage area of ​​50km, it is necessary to select the third GP length and the corresponding frame structure for data transmission. At this time, a large part of the time slot is actually wasted as a guard interval, which actually affects the transmission efficiency.

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