LTE (long term evolution)-Advanced system based random access overload control method

Abstract

The invention discloses an LTE (long term evolution)-Advanced system based random access overload control method. The method includes: detecting and estimating number of users at a base station and judging whether the current network situation is overload or not according to the estimated number of the users; if yes, adding one random access time and frequency resources for random access, and if the random number x of the users is less than a threshold value A, then the user UE (user equipment) selecting the first available random access resource to initiate random access; if not, and the random number y generated from the users is less than a preset threshold value B, the users performing access, or otherwise, waiting for coming of the next random access opportunity for access. Compared with the prior art, the method has the advantages that the number of the users accessing to the network terminal is dynamically and reasonably controlled, load accessing to the network terminal is always kept within an acceptable range, the users can be scattered then many users access to the network at the same frequency simultaneously, the users are enabled to access to the network as soon as possible, and random access performance of the system in case of network congestion is greatly improved.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a random access overload control method suitable for LTE-Advanced system. Background technique [0002] LTE-Advanced is an evolved version of LTE (Long Term Evolution) technology. In this system, the network must first establish a connection before communicating with the UE, and the UE establishes an RRC connection with the base station by initiating a random access process, which can enable the UE to maintain uplink synchronization with the base station. Therefore, the random access process will directly affect the performance of the system. However, due to the limited random access resources, when a large number of terminals access the base station at the same time, it will cause network congestion, which will increase the probability of terminal access collisions, reduce the success rate of random access, and cause random access transmission Latency increases. ...

AI Technical Summary

Problems solved by technology

Therefore, the random access process will directly affect the performance of the system

However, due to the limited random access resources, when a large number of terminals access the base station at the same time, it will cause network congestion, which will increase the probability of terminal access collisions, reduce the success rate of random access, and cause random access transmission Increased delay

[0003] The commonly used methods for improving the random access performance of the LTE system in the prior art are mainly divided into two types. The first one is the back-off algorithm. In this technology, users who have collided with the random access preamble are backed off for a period of time and then resent. Reduce the probability of random access collisions, but it may still be impossible to avoid too many collisions when the network load is high, resulting in users being unable to access the network for a long time; Finally, the method of increasing the power to a certain level improves the success rate of random access, but the possible reason for random access failure is not necessarily that the transmission power is too small to correctly parse the random access preamble, or it may be caused by random access preamble collision. Blindly increasing the transmission power may cause power waste and interference problems

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