Uplink access method for td‑lte/td‑lte‑a system differentiated user priority preamble allocation

Abstract

The invention discloses an uplink access method for distribution of lead codes for distinguishing the user priority in a TD-LTE / TD-LTE-A system. The unlink access method is a random access method for achieving different QoS services. The uplink access method includes the steps of (1) a lead code generation sorting stage; (2) a lead code distribution stage, wherein the lead codes are divided into the exclusive lead codes and the competitive lead codes for the first time; during secondary division, the competitive lead codes are divided into n groups according to the user group level number n, G1, G2, ...Gn-1 groups are the priority lead code groups and are used for backoff access of user groups corresponding to the priority lead code groups, and the Gn group is used for public access; an eNB enables the distribution scheme to be notified to all terminals in a broadcasting mode; (3) a random access stage, UE selects the front codes according to broadcast information to have access, a window does not receive any response in the waiting time, collision exists in the access, the terminals back off according to rules and reaccess is performed, and access fails when the maximum access time is exceeded. In random access based on competition, low delay and high throughout of high priority access can be guaranteed, and the requirements for different QoS services of the TD-LTE / TD-LTE-A system are met.

Description

technical field [0001] The present invention relates to a random access method for TD-LTE / TD-LTE-A system, more specifically, to a random access method for realizing different QoS services. Background technique [0002] Compared with the public communication system, the professional communication system has a faster corresponding speed; such as the TETRA system, the call establishment time within the same base station range is less than 300ms, and the call establishment time within the same network is less than 500ms, and it is a real-time answering mode, Messages can be communicated without requiring the user to connect. [0003] Public communication systems, such as 2G GSM networks, generally take 10-15s to establish a call; this is completely unfeasible during major disasters such as earthquakes and flood control. [0004] The internal one-way transmission delay of the LTE user plane is less than 5ms, the transition time of the control plane from the sleep state to the a...

AI Technical Summary

Problems solved by technology

[0010] Usually, the indicators to measure the advantages and disadvantages of fast call establishment technology include throughput and delay, because the simultaneous access of a large number of user terminals will cause the increase Therefore, how to improve the access success rate of a large number of terminals and meet the access requirements of a large number of terminals is one of the challenges in the design of access methods.

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