SRS and periodical CSI transmission and indication method, apparatus thereof and system thereof

Abstract

The invention relates to the communication field, and discloses an SRS (sounding reference symbol) and periodical CSI (channel state information) transmission and indication method, an apparatus thereof and a system thereof. The method comprises the following steps: an SRS and periodical CSI feedback mechanism in an LTE-A (long term evolution-advanced) system is made afresh, which means that according to received configuration information from a base station side, UE determines a transmission SRS or transmission periodical CSI in an uplink subframe configured with SRS transmission. In this way, a situation that the SRS is discarded excessively when an SRS is conflicted with a periodical CSI in a same uplink subframe is avoided, the base station can timely obtain uplink channel information, accuracy of system uplink scheduling is raised, and service reliability of the system is raised. The invention discloses corresponding apparatus and system simultaneously.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, device and system for transmitting SRS and periodic CSI and indicating the same. Background technique [0002] In the Long Term Evolution-Advanced (LTE-Advanced) system, referred to as the LTE-A system, in order to support a wider system bandwidth than the LTE system, such as 100MHz, the following two spectrum allocation methods are usually used: [0003] One is to directly allocate the spectrum with a bandwidth of 100M in the form of a single spectrum, specifically as figure 1 shown. [0004] The other is to use the spectrum aggregation method to aggregate the spectrum allocated to the existing system into 100M bandwidth for the system to use, specifically as figure 2 shown. refer to figure 2 As shown, when the spectrum aggregation method is adopted, the uplink and downlink carriers in the LTE-A system can be configured asymmetrically, that is, the user terminal...

AI Technical Summary

Problems solved by technology

[0011] For the LTE-A system, up to 5 carriers can be aggregated at present, that is, in the same uplink subframe, in order to facilitate downlink scheduling, the UE will feed back the periodic CSI corresponding to multiple downlink carriers in one uplink subframe , the amount of CSI feedback is large, and the CSI of multiple downlink carriers can be configured with different feedback periods, thereby increasing the feedback density of periodic CSI; in this way, on PUCCH, periodic CSI and SRS are fed back in the same uplink subframe If the LTE-A system still uses the SRS feedback mechanism of the LTE system, then the probability of SRS being discarded is relatively high. In this way, the base station will not be able to obtain the channel status of the uplink carrier in time, thus affecting the accuracy of uplink scheduling.

Images