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Methods and arrangements for CSI reporting

A technology for reporting and channel state information, applied in the direction of transmission modification based on link quality, multiple use of transmission paths, transmission monitoring, etc.

Active Publication Date: 2015-02-11
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0058] While the possibility of associating the CSI process with one or more IMRs enables the network to obtain a better basis for making link adaptation and scheduling decisions, there is still room for further improvement in determining channel state information

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  • Methods and arrangements for CSI reporting
  • Methods and arrangements for CSI reporting
  • Methods and arrangements for CSI reporting

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Embodiment Construction

[0078] A particular problem with implementing interference measurements for CoMP is that even within a single CoMP coordinating cluster, CoMP measurements for different TPs within the cluster will configure different UEs; A separate CoMP measurement set for all nodes of . Therefore, each such UE will experience a different set of TPs such as residual interference or uncoordinated interference.

[0079] Especially for larger CoMP clusters, it may become prohibitive to configure different IMRs for each such residual interference combination. Thus, for some configurations of the CoMP measurement set, the UE will measure residual interference that lacks contributions from one or more interfering TPs, and / or that actually includes one or more TPs that should not be interfering.

[0080] This match between the interference measured for the CSI report and the actual interference experienced in the downlink transmission will degrade the link adaptation of the network and reduce the o...

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Abstract

Some embodiments provide a method in a wireless device for reporting channel state information, CSI, for a CSI process. The CSI process corresponds to a reference signal resource and an interference measurement resource. According to the method, the wireless device obtains an adjustment value associated with the CSI process. The wireless device estimates an effective channel based on one or more reference signals received in the reference signal resource, and applies the adjustment value to the estimated effective channel, thereby obtaining an adjusted effective channel. Furthermore, the wireless device determines channel state information based on the adjusted effective channel, and on interference estimated based on the interference measurement resource. Finally, the channel state information is transmitted to a network node.

Description

technical field [0001] The present invention relates to methods and apparatus for reporting channel state information. 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). Long Term Evolution is a technology for realizing high-speed packet-based communication capable of high data rates in both downlink and uplink, and is considered to be a next-generation mobile communication system relative to UMTS. To support high data rates, LTE allows a system bandwidth of 20MHz or up to 100Hz when carrier aggregation is used. LTE is also capable of operating in different frequency bands and in at least Frequency Division Duplex (FDD) and Time Division Duplex (TDD) modes. [0003] LTE uses Orthogonal Frequency Division Multiplexing (OFDM) in the...

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Application Information

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IPC IPC(8): H04B7/02H04L5/00
CPCH04L5/0057H04W24/02H04W52/325H04B7/0619H04L25/03949H04B7/0639H04L5/005H04L5/0026H04L25/0224H04L5/0035H04B7/0456H04B7/0617H04L1/0026H04B7/063H04W52/16H04B1/7115H04B17/00H04L5/00Y02D30/70H04W24/10H04B7/0626
Inventor D·哈玛瓦尔S·伯格曼
Owner TELEFON AB LM ERICSSON (PUBL)