TDD system signal transmission method and the adoptive frame structure thereof

Abstract

A signal transmission method in a Time Division Duplex (TDD) system is disclosed. The method comprises following steps: within a time length of a half-frame of a radio frame, base station transmits signal on a downlink special time slot, thereafter does not transmit signal on a Guard Period (GP), and then receives signal on an uplink special time slot; all time lengths of other uplink or downlink normal time slots for transmitting signal are equal; the total time length of the downlink special time slot, the guard period and the uplink special time slot is integer times of the time length of an uplink or downlink normal time slot. In addition, a frame structure adopted in the TDD system which corresponds to the method is disclosed. The present invention makes it flexible to set the duration of the GP and it is guaranteed that, even if a synchronization signal adopts power promotion, it will not bring great interference to uplink reception of other base stations; in addition, the utilization efficiency of the system is improved.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a transmission method of a time division duplex system signal and a frame structure adopted therefor. Background technique [0002] figure 1 It is a schematic diagram of the wireless frame structure of a time division duplex system. In the schematic diagram, a 10ms radio frame includes two equal-length half-frames, and the length of each half-frame is 5ms. Each half frame includes 7 general time slots (also called subframes) and 3 special time slots DwPTS, GP and UpPTS. The total length of the three special time slots DwPTS, GP and UpPTS is equal to 275us. [0003] Among them, the length of the DwPTS time slot is approximately equal to 83.333us, and the primary synchronization signal (P-SCH) is sent on the middle bandwidth of the time slot, and the primary synchronization signal is mainly used for downlink synchronization. The other bandwidths of the time slot do not send ...

AI Technical Summary

Problems solved by technology

[0011] GP's setup is very inflexible

In this system, the length of the GP time slot is equal to 50us. When the system needs to support a wider range of coverage, the length of the GP must be expanded. The method of expanding the GP can be to reserve the UpPTS time slot as the GP time slot, or reserve the UpPTS time slot slot and TS1 is a GP time slot (it is not possible to reserve some symbols of TS1 as GP, because the uplink control channel is usually located on both sides of the system bandwidth, and the duration is one time slot, if some symbols of TS1 are reserved as GP , the receiving performance of the uplink control channel will be severely degraded, and part of the symbols of TS0 cannot be reserved as GP, because the P-SCH / S-SCH signal is sent in the last two symbols of TS0, if part of the symbols of TS0 are reserved as GP, the user may not be able to receive the P / S-SCH signal, and the P / S-SCH signal is the first signal that the user needs to receive when accessing the system. If the user cannot receive the P / S-SCH signal correctly, he will not be able to access the system )

[0012] The P / S-SCH signal is located at the boundary between the downlink time slot and the uplink time slot. As mentioned above, the P / S-SCH signal is the first signal that the user needs to receive when accessing the system. Therefore, the P / S-SCH signal The power is usually greater than other signals. In a cellular environment, due to the high power of the P / S-SCH signal, it will seriously affect the receiving performance of the uplink time slot signal;

[0013] The utilization efficiency of the DwPTS time slot is not high. When the system bandwidth is relatively wide, since only the P-SCH signal is sent in the middle bandwidth (1.25MHz) of the system bandwidth, the utilization efficiency of the DwPTS time slot will be very low

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