Method and device for determining timing advance in random access process

Abstract

The invention discloses a method and device for determining timing advance in a random access process, aiming at improving the uplink synchronous timing precision. The method for determining the timing advance, provided by the invention, comprises the following steps of: fixing a sample value point position TAmax corresponding to a peak power Pmax in a current random access detection window; when a random access sequence exists in the detection window, comparing the Pmax with the power P corresponding to the adjacent sample value point position of the TAmax, and renewably regulating the sample value point position TA'max corresponding to the Pmax according to a comparison result, wherein P is a larger power among the powers corresponding to the sample value point positions closest to the left side and the right side of the TAmax; and determining the timing advance by utilizing the TA'max.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for determining a timing advance in a random access process. Background technique [0002] The purpose of the random access procedure is to establish an uplink synchronization relationship between the user equipment (UE) and the evolved base station (eNodeB), and request the eNodeB to allocate dedicated resources for uplink transmission to the UE, so as to perform normal service transmission. When the UE is turned on, it will perform the downlink time-frequency synchronization process and cell identification (ID) detection. If it finds a suitable cell, it will reside in the cell, interpret the system broadcast information of the cell, and then enter the idle state (RRC_IDLE). In the idle state, the UE will monitor its own paging message and whether the system information of the cell where it resides changes, so as to update the content of the sy...

AI Technical Summary

Problems solved by technology

[0014] Taking the LTE system as an example, the existing algorithm is mainly based on the sample position TA of the peak power in the detection window max To judge the timing advance N TA , then the minimum timing accuracy at this time is the duration of a Preamble sample, that is, 24567T s / 839≈29Ts or 4096T s / 139≈29T s , while the 36.213 standard defines N TA = TA ( ID preamble ) × 16 T s , That is, the minimum timing accuracy required by the standard is Obviously, the timing advance N calculated by the prior art TA , unable to meet the timing accuracy requirements for uplink synchronization

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