Uplink reference symbol transmission method, system and user equipment

Abstract

The invention discloses an uplink reference symbol transmission method and system, and user equipment wherein the method comprises the following steps: when user equipment needs to send data to a base station, mapping the uplink de-modulation reference signal (DMRS) on the first and the nth OFDM symbols of each sub-frame carrying the data; sending the data to the base station wherein n is bigger than one yet smaller than eight; when the base station receives the data, using the DMRS on each sub-frame to conduct channel estimation; and through the utilization of the channel estimation result, conducting demodulation processing to the corresponding received data. With the method, system and user equipment, it is possible to reduce the receiving and processing delay in PUSCH and to increase the demodulation performance of PUSCH under a high speed mobile scene.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to an uplink reference symbol transmission method, system and user equipment. Background technique [0002] At present, for the sake of safety, the 1ms 5G air interface delay index required by autonomous driving, in order to meet the 5G low-latency transmission requirements of autonomous driving, short subframe design has become a basic design direction. Based on the LTE FDD frame structure, the short subframe design is adopted to reduce the air interface transmission delay of the communication system, and the transmission time interval (TTI) length will be reduced to 0.5ms, that is, a physical resource block (PRB) is defined as: the time domain is 7 OFDM symbols, 24 subcarriers in the frequency domain. [0003] The subcarrier spacing is a compromise between the cyclic prefix (CP) overhead ratio and frequency offset sensitivity. The 15kHz subcarrier is sufficient to meet t...

AI Technical Summary

Problems solved by technology

Moreover, since there is no DMRS on the first three OFDM symbols of the first time slot, when the receiving end receives PUSCH, it can only buffer the data of the first three OFDM symbols received, and the DMRS can only be used after receiving the DMRS. The result of channel estimation demodulates the buffered data, so that the receiving and processing delay of PUSCH will be relatively large

[0006] With the 5G short subframe structure, a PRB has only 7 OFDM symbols in the time domain. If the DMRS pilot pattern in LTE is used, only one OFDM symbol in each subframe is DMRS. At this time, interpolation calculation cannot be performed, so the channel cannot be guaranteed. Estimated performance, thus unable to ensure the demodulation performance of PUSCH in high-speed mobile scenarios

In addition, due to the large delay in receiving and processing PUSCH in LTE, it cannot meet the low-latency transmission requirements of the 5G system.

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