Base station, user equipment, and methods therein in a communications system

A technology for user equipment and wireless communication systems, applied to base stations in communication systems, user equipment and their fields, can solve the problems of user equipment not deriving channel state information, interference mismatch, etc., and achieve multi-channel capacity and improve network performance. Effect

Active Publication Date: 2015-01-14
ERICSSON (CHINA) COMMUNICATION COMPANY LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This difference in interference causes the interference mismatch problem
The interference mismatch problem causes the user equipment that uses the reference signal RE to calculate the channel state information to not derive the correct channel state information

Method used

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  • Base station, user equipment, and methods therein in a communications system
  • Base station, user equipment, and methods therein in a communications system
  • Base station, user equipment, and methods therein in a communications system

Examples

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Embodiment Construction

[0029] Examples will be illustrated in the following non-limiting description.

[0030] figure 2 A wireless communication system 200, such as a HetNet 200, is shown in which embodiments herein may be implemented. The wireless communication system 200 may be configured for different technologies, or E-UTRAN, WiMAX or any other similar technology.

[0031] The wireless communication system 200 includes a first base station 210 . The first base station 210 is a radio base station serving the first cell 202 . In some embodiments, the wireless communication system 200 may further include a second base station 212 . The second base station 212 is a radio base station serving the second cell 204 . The first radio base station 210 and the second radio base station 212 are radio network nodes, which in this example may be eNBs, eNodeBs or home NodeBs, home eNodeBs, WiMAX base stations or machine type communication devices capable of serving the wireless communication system 200 A...

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PUM

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Abstract

A method in a first base station for obtaining channel state information from a user equipment is provided. The first base station is comprised in a wireless communication system. The wireless communication system further comprises the user equipment. The first base station estimates (403) a first offset value for a first set of subframes based on a first channel information. The first base station further estimates (404) a second offset value for a second set of subframes based on a second channel information. The first base station transmits (405) the estimated first offset value and the estimated second offset value to the user equipment. The first base station then obtains (407) channel state information from the user equipment. The channel state information is based on the transmitted estimated first offset value and the estimated second offset value. The channel state information is to be used for transmission in the first base station.

Description

technical field [0001] The embodiments herein generally relate to a method in a base station, a method in a user equipment, a base station and a user equipment. In particular, embodiments relate to obtaining and transmitting channel state information feedback in a wireless communication system. Background technique [0002] The 3rd Generation Partnership Project (3GPP) is responsible for the standardization of Universal Mobile Telecommunications System (UMTS) and Long Term Evolution (LTE). The 3GPP work on LTE is also known as the Evolved Universal Terrestrial Access Network (E-UTRAN). LTE is a technology for realizing high-speed packet-based communication capable of high data rates both in downlink and uplink, and is regarded as a next-generation mobile communication system relative to UMTS. [0003] In LTE, Orthogonal Frequency Division Multiplexing (OFDM) is used in the downlink. LTE physical resources can be viewed as a time-frequency grid, where each resource element...

Claims

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Application Information

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IPC IPC(8): H04W24/10H04W88/02H04W88/08
CPCH04L25/0228H04B17/00H04B7/0626H04J11/0023H04L5/0053H04W24/08H04W52/241H04W52/245
Inventor 李韶华胡旸汪剑锋
Owner ERICSSON (CHINA) COMMUNICATION COMPANY LTD
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