Random access method, device and system

The embodiment of the invention provides a random access method, device and system. The access efficiency of the terminal equipment can be improved. Specifically, network equipment determines K TA values after receiving a plurality of first messages, and sends a second message, the second message comprises the K TA values, and TC-RNTI and uplink authorization corresponding to each TA value in theK TA values, and K is a positive integer greater than 1. First terminal equipment receives the second message, determines a first TA value from the K TA values, and sends a third message including theidentifier of the first terminal equipment to the network equipment on the resource indicated by the uplink authorization corresponding to the first TA value, the third message being scrambled by using the TC-RNTI corresponding to the first TA value. The network equipment receives a third message from the first terminal equipment on the resource indicated by the uplink authorization correspondingto the first TA value, and