A method and device for allocating SRS resources in an LTE system

Abstract

The present invention provides a method for Sounding Reference Signal (SRS) resource allocation in a Long Term Evolution (LTE) system, including: a system side setting different SRS transmission periods to correspond to different cycle shifts, and during the process of allocating SRS resources for user equipment (UE), setting a cycle shift adopted by the UE according to the SRS transmission period adopted by the UE. The method and apparatus of the present invention realize simple and effective SRS resource multiplexing with high utilization ratio among UEs with different periods.

Description

technical field [0001] The present invention relates to the technical field of wireless communication systems, in particular to a SRS (Sounding Reference Signal, Sounding Reference Signal) resource allocation method and device for an LTE (Long Term Evolution, Long Term Evolution) system. Background technique [0002] In the Long Term Evolution (LTE) system, the Sounding Reference Signal (SRS) can be used to perform LTE uplink scheduling, synchronization and power control, so the SRS plays a very important role in the LTE system. The minimum bandwidth for SRS resource allocation is 4 RBs (Resource Block, resource block), and each RB is composed of 12 subcarriers in the frequency domain. , Physical Uplink Control Channel) and the bandwidth occupied by PRACH (Physical Random Access Channel, Physical Random Access Channel) are jointly determined. The LTE protocol stipulates that the SRS signal can only be transmitted in the last symbol of the uplink regular subframe. For TDD (T...

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Problems solved by technology

[0005] According to the various technical conditions available above, SRS resource allocation can be in many different ways. At the same time, due to the influence of tree structure, frequency hopping and different SRS transmission cycles, etc., SRS resource allocation also has many restrictions.

For example, for the odd tree of the SRS tree, the premise that its parent node can be allocated to UE is that all its child nodes have not been allocated, that is, as long as any child node of the parent node is allocated, then the parent node will It cannot be allocated as a whole, but can only be allocated to UEs with the same bandwidth as its child nodes as a whole; for the odd tree of the SRS tree, if UEs with various SRS transmission periods are included, due to the periodicity Different, the frequency hopping of each UE will not be synchronized, which will cause the bandwidths of different UEs to send SRS to overlap, resulting in mutual interference. If UEs with different periods are sent on different subframe offsets, due to the UE SRS period configuration There are many, and the available subframe offsets are not sufficient enough. More importantly, there are too many configuration types of subframe offsets, which will make the resource multiplexing process of SRS very complicated; similarly, for the even tree of the SRS tree also have the same problem

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