Method and system for sending sounding reference signal (SRS) used in coordinated multi-point (CoMP) transmission system

A technology for measuring reference signals and multi-point transmission. It is used in transmission systems, digital transmission systems, diversity/multi-antenna systems, etc. It can solve the problem of not providing an implementation solution, and achieve the effect of improving the quality of channel estimation and reducing the amount of feedback.

Active Publication Date: 2011-05-18
ZTE CORP
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Problems solved by technology

At this time, for the receiving end (base station) of the uplink, how to reasonably configure the transmission of SRS so as to improve the channel estimatio

Method used

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  • Method and system for sending sounding reference signal (SRS) used in coordinated multi-point (CoMP) transmission system
  • Method and system for sending sounding reference signal (SRS) used in coordinated multi-point (CoMP) transmission system
  • Method and system for sending sounding reference signal (SRS) used in coordinated multi-point (CoMP) transmission system

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Example

[0065] In the first embodiment, it is assumed that in the configuration information, the cell-specific subframe period T of each cell in the coordinated multi-point transmission system coordination set SFC and the cell-specific subframe offset Δ SFC If set to be consistent, the configuration information of each cell in the cooperating set and / or the SRS transmission information of each cell in the cooperating set are exchanged between the cooperating sets.

[0066] The configuration information of each cell in the cooperative set is exchanged between base stations (inter cite / cell) through the X2 interface or within the base station (intra cite / cell) through an internal interface of the base station. The base station uses the channel estimation method of linear minimum mean square error (LMMSE) for the received SRS according to the configuration information exchanged in the cooperative set to perform accurate channel estimation. The channel estimation method of LMMSE is shown...

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Abstract

The invention discloses a method and a system for sending a sounding reference signal (SRS) used in a coordinated multi-point (CoMP) transmission system. The method comprises the following steps: base stations set configuration information for sending the SRS and issue the information to a user terminal; and the user terminal sends the SRS to the base stations according to the acquired configuration information. By utilizing the method, the quality for SRS channel estimation via each base station in a coordination set is improved so that the base stations can obtain downlink channel information by virtue of channel reciprocity, thus greatly reducing the feedback quantity of UE (user equipment).

Description

technical field [0001] The present invention relates, in particular, to a method and system for sending a measurement reference signal (SRS, Sounding Reference Signal) for a coordinated multi-point (CoMP, Coordinated Multi-point) transmission system. Background technique [0002] The uplink physical channels of the Long Term Evolution (LTE, Long Term Evolution) system include Physical Random Access Channel (PRACH, Physical Random Access Channel), Physical Uplink Shared Channel (PUSCH, Physical uplink shared channel), Physical Uplink Control Channel (PUCCH, Physicaluplink control channel). Among them, PUSCH has two different cyclic prefix (CP, Cyclic Prefix) lengths, which are normal cyclic prefix (Normal CP, Normal Cyclic Prefix) and extended cyclic prefix (Extended CP, Extended Cyclic Prefix). Each transmission subframe (Subframe) of PUS CH consists of two time slots (S1ot). For different cyclic prefix lengths, the position of the demodulation reference signal (DMRS, Demod...

Claims

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Application Information

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IPC IPC(8): H04W72/12
CPCH04L5/0094H04B7/024H04L5/0035H04L5/0048
Inventor 王瑜新郝鹏陈艺戬
Owner ZTE CORP
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