Coexisting method and device of TDD system

Abstract

The embodiment of the invention discloses a concomitant method and device of a time duplex system, which is used for achieving the concomitance of a first time duplex system and a second time duplex system. The concomitant method comprises: distributing the ratio information according to the radio frame gap in the first time duplex system and the second time duplex system, and confirming the distributing period by one radio frame, the service sub frame of the radio sub frame in the first time duplex system and the distributing way of the special area; according to the second frame of the TDD system timing information, the second time division duplex wireless system frame based on the initial moment of time, set the time offset for the first time division duplex system, the relative timing of the base frame of the partial moments shift. Cases the implementation of the invention also provides a base station.

Description

Technical field [0001] The present invention relates to the field of mobile communication technology, in particular to a coexistence technology of a time division duplex system. Background technique [0002] The 3rd Generation Mobile Communication (3G) adopts Code Division Multiple Access (CDMA) technology to support multimedia services and will have high competitiveness in the next few years. Time Division Duplex (Time Division Duplex, TDD) CDMA includes two formats: TD-CDMA (Time Division CDMA) and TD-SCDMA (Time Division-Synchronous CDMA). International Telecommunication Union (International Telecommunication Union, ITU) standards call TD-CDMA as High Chips Rate (HCR) TDD, and TD-SCDMA as Low Chips Rate (LCR) TDD. [0003] TD-SCDMA is the only standard that supports TDD among the three international standards of the 3G system. TD-SCDMA supports uplink and downlink asymmetric service transmission, and has greater flexibility in spectrum utilization. TD-CDMA currently has some c...

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Problems solved by technology

[0007] The frame structure design of the LTE TDD system in the prior art only considers the compatibility with the TD-SCDMA system. The LTE TDD system can realize coexistence with the TD-SCDMA system, but the frame structure design of the LTE TDD system does not consider the compatibility with the TD-CDMA system. system compatibility

In the area where TD-CDMA network has been deployed, when LTE TDD network needs to be deployed, there will be serious inter-system interference between TD-CDMA system and LTE TDD system, resulting in the failure of both systems to work normally

[0008] like image 3 As shown, in the case where TD-CDMA system and LTE TDD system exist at the same time, because the design of the frame structure does not consider compatibility, the wireless frames of the two systems will have overlapping areas of uplink time slots and downlink time slots, which is called interference area, resulting in severe intersystem interference

For example, in a certain interference area, the TD-CDMA system sends downlink data, while the LTE TDD system receives uplink data at the same time, the LTE TDD system may receive the downlink data sent by the TD-CDMA system in a certain time slot, and the LTE TDD system sends the downlink data The data is processed as the uplink data that the system needs to receive, causing the TD-CDMA system to form strong interference to the LTE TDD system; on the contrary, if in a certain interference area, the LTE TDD system sends downlink data, while the TD-CDMA system receives uplink data at the same time , will cause the LTE TDD system to form strong interference to the TD-CDMA system

The interference in the radio frames of the two TDD systems due to the coincidence of uplink time slots and downlink time slots makes the two systems unable to work normally

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