Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and apparatus for channel quality derivation

A technology for channel quality estimation and wireless communication equipment, which is applied in channel estimation, transmission systems, electrical components, etc., and can solve problems such as reduced reference signal transmission and impact on RLM performance.

Inactive Publication Date: 2012-07-18
TELEFON AB LM ERICSSON (PUBL)
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Energy saving in LTE eNB can lead to reduction of reference signal transmission and thus will negatively affect RLM performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for channel quality derivation
  • Method and apparatus for channel quality derivation
  • Method and apparatus for channel quality derivation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] As a non-limiting example, figure 1 An embodiment of a wireless communication network 10 is illustrated comprising a radio access network (RAN) 12 configured to communicatively couple one or more mobile terminals 14 to a core network (CN) 16 which in turn is communicatively coupled to one or more (external) Internet Protocol (IP) networks 18 . Specifically, RAN 12 provides downlink services based on its transmission to terminals 14 of one or more Orthogonal Frequency Division Multiplexing (OFDM) signals.

[0016] Using the Long Term Evolution (LTE) network standard as an example, figure 1 The RAN 12 is depicted as an "evolved UMTS Terrestrial RAN" or E-UTRAN comprising an "evolved Node B" or eNB 20 . The CN 16 behaves as an "Evolved Packet Core" or EPC comprising a "Mobility Management Entity" or MME 22 and a "System Architecture Evolved Gateway" or SAE GW 24 . For additional introductory information on LTE, one may refer to the Ericsson white paper entitled "LTE-an ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In one aspect, a method and apparatus derive channel quality estimates for given subcarriers in an OFDM signal, based on reference signal (RS) or other known-signal measurements made for another set of subcarriers. In at least one embodiment, a wireless communication apparatus implements a method whereby it is configured for receiving reference information on the first set of subcarriers; generating the first channel quality estimates in the frequency domain, based on the received reference information; computing a power delay profile for the first set of subcarriers; and determining the second channel quality estimates either by extrapolating from the first channel quality estimates or as an average of the first channel quality estimates, depending on a delay spread of the power delay profile.

Description

technical field [0001] The present invention relates generally to communication signal processing, and in particular to deriving a channel quality estimate for one set of subcarriers in an OFDM signal based on a channel quality estimate determined for another set of subcarriers. Background technique [0002] Receiver synchronization and radio link monitoring (RLM) support important functions in a typical wireless communication network. For example, in a wireless communication network operating according to the Long Term Evolution (LTE) standard, the (primary and secondary) synchronization signals transmitted from the eNB allow a mobile terminal or other item of user equipment (UE) to detect and synchronize with new cells for Signal quality / strength measurements allowing good handover (HO) decisions. Similarly, RLM allows individual terminals to detect radio link failures, as well as other communication problems, and take or otherwise trigger appropriate actions, such as rec...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04L25/02H04B17/00
CPCH04B17/0042H04B17/0075H04L25/022H04L25/0232H04B17/0047H04B17/007H04L25/0222H04B17/26H04B17/309H04B17/364H04B17/373
Inventor B·林多夫B·伯恩哈德森M·卡兹米
Owner TELEFON AB LM ERICSSON (PUBL)