1. A transmission timing adjustment method, comprising:determining, by a base station, a transmission delay between user equipment (UE) and the base station;
generating, by the base station, a timing advance (TA) quantized value according to the transmission delay, wherein the TA quantized value comprises a base value and an offset value, quantization precision of the base value is first quantization precision MTs, quantization precision of the offset value is second quantization precision NTs, M is a positive integer less than or equal to 16, N is a nonnegative integer less than M, and Ts has a value of 1/30.72 ?s, wherein
when M is less than 16, and N is 0, the generating the TA quantized value comprises:
quantizing the transmission delay according to the first quantization precision MTs, to obtain the quantized value of the transmission delay, wherein the quantized value of the transmission delay is the TA quantized; and
sending, by the base station, the TA quantized value to the UE for uplink transmission timing adjustment of the UE.