GPS assistance-based LTE ultra-long-distance coverage random access method

Abstract

The invention discloses a GPS assistance-based LTE ultra-long-distance coverage random access method, which mainly solves the problem that the LTE coverage area in the prior art is small, and the userequipment UE outside the maximum coverage radius cannot successfully access the network. The technical scheme is as follows: 1) configuring location information and an uplink timing open loop adjustment distance threshold; 2) calculating the distance from the user equipment to a target base station; 3) judging whether the distance from the user equipment to the target base station is greater thanthe open loop distance threshold; 4) calculating open loop adjustment time; 5) synchronizing the open loop adjustment uplink time; 6) sending a random access prefix sequence; 7) synchronizing closedloop adjustment uplink time and accessing to an LTE system. The GPS assistance-based LTE ultra-long-distance coverage random access method in the invention expands the coverage area of the LTE base station and improves the uplink resource utilization, so that the user equipment UE located outside the maximum coverage area of the existing LTE can successfully complete network access process and uplink time synchronization with the assistance of the GPS.

Description

technical field [0001] The invention belongs to the field of communication technology, and in particular relates to a GPS-assisted LTE ultra-long-distance coverage random access method, which can be used to expand the existing coverage of Long Term Evolution (Long Term Evolution), so that it is located outside the maximum coverage of the existing LTE With the assistance of GPS, the user equipment UE can successfully complete the network access process and uplink time synchronization. Background technique [0002] In the long-term evolution LTE system, the user equipment UE accesses the network by sending a random access prefix Preamble on the physical random access channel PRACH and realizes the uplink time synchronization of the user equipment UE. Before the user equipment UE accesses the LTE base station, due to the user When the device UE sends the random access sequence, the uplink time synchronization has not been completed. In order to protect the normal operation of t...

AI Technical Summary

Problems solved by technology

Guard Period is the maximum adjustment time of the user equipment UE that can be detected by the LTE base station. When the distance between the user equipment UE and the LTE base station is greater than 107Km, the random access prefix Preamble sequence sent by the asynchronous user equipment UE will fall into The adjacent next subframe interferes with the service transmission of the corresponding resources of the next subframe, and at the same time, the LTE base station cannot completely receive the random access prefix Preamble sequence sent by the user equipment UE, resulting in detection errors, which prevent the user equipment UE from successfully completing Network access process and uplink time synchronization

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