Method, apparatus and system for enlarging coverage area

Abstract

The invention provides a method for expanding coverage area, a device and a system thereof. In frequency resources occupied by an uplink packet random access channel (PRACH), an evolved Node B (eNB) allocates first N time symbols of a next service subframe which is closely adjacent to an uplink pilot time slot (UpPTS) subframe or last N time symbols of a previous service subframe which is closelyadjacent to the UpPTS, and partial or all time frequency resources occupied by the UpPTS to the PRACH, and sends an allocation result to UE by a broadcast channel; wherein, the time symbols comprise orthogonal frequency division multiplexing (OFDM) symbols or single carrier frequency division multiple access (SC-FDMA), N is a natural number, and N is not less than 1 and not more than 7. Therefore, the coverage area of the eNB is expanded, and the interference of the DwPTS on the PRACH is reduced, and only part of the time frequency resources in the N time symbols of the service subframe are needed to be occupied, thus saving the time frequency resources.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a method, device and system for expanding coverage. Background technique [0002] Time-division synchronous code-division multiple access (TD-SCDMA) is the only technology that adopts time-division duplex (TDD) among the three major international standards of the third-generation mobile communication system. The TD-SCDMA system supports uplink and downlink asymmetric service transmission. Spectrum has greater flexibility. In order to maintain the long-term competitiveness of the TD-SCDMA system, the TD-SCDMA system also needs to continuously evolve and improve its capabilities. In the long-term evolution solution (LTE TDD) of the TD-SCDMA system, the preferred radio frame structure is the second type of radio frame structure compatible with the TD-SCDMA system. [0003] figure 1 is the second type of wireless frame structure diagram in the prior art, such as figure 1...

AI Technical Summary

Problems solved by technology

[0004] In the actual application process, due to the uncertain distance and transmission delay between the evolved base station (eNB) and the user terminal (UE), if the UE wants to achieve uplink synchronization, it is necessary to make the starting time of the PRACH fall on the GP during the time period, such as figure 2 As shown, this will cause PRACH to occupy the time period of GP, reducing the coverage of eNB, resulting in the actual supported coverage of far less than 5km, only about 3.75km, and because PRACH is relatively close to DwPTS, it will also be affected by the remote Interference of DwPTS sent by eNB

However, since the length of the service subframe TS1 is 0.675ms, which is too long compared with the transmission time of the uplink pilot signal, this will inevitably cause excessive waste of time-frequency resources

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