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Method and device in wireless communication system

A relationship and channel technology, applied in the field of wireless communication systems, can solve the problems of difficult to use information, difficult to know the use of different data streams, impossible to use, etc., to achieve the effect of improving dynamic switching

Active Publication Date: 2016-03-16
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is more difficult for the eNodeB or base station to deviate from the recommended rank since these CQI reports are directly related to this rank
Thus, the change in rank makes it difficult or impossible to utilize the information provided by the CQI reports—that is, if the eNodeB or base station overrides the rank recommended by the UE, it will be difficult for the eNodeB or base station to know which rank to use on different data streams. MCS

Method used

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  • Method and device in wireless communication system
  • Method and device in wireless communication system
  • Method and device in wireless communication system

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Embodiment Construction

[0034] In this section, the invention will be illustrated in more detail by means of some exemplary embodiments. It should be noted that these embodiments are not mutually exclusive. Components from one embodiment may be automatically assumed to be present in another embodiment, and those skilled in the art will understand how those components may be used in other exemplary embodiments.

[0035] It should be noted that although terminology from 3GPP LTE has been used in this disclosure to demonstrate the invention, this should not be seen as limiting the scope of the invention to the aforementioned systems only. Other wireless systems, including Wideband Code Division Multiple Access (WCDMA), Worldwide Interoperability for Microwave Access (WiMax), Ultra Mobile Broadband (UMB), and Global System for Mobile Communications (GSM) systems may also benefit from the use of the idea.

[0036] Also, terms such as eNodeB and UE should be considered non-limiting and, in particular, no...

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Abstract

The present invention relates to a method and apparatus for rank adaptation for transmission over a multiple-input multiple-output MIMO channel in a wireless communication system. The receiving node (270) performs (310) measurements on the reference signal received from the transmitting node (200). The receiving node performs (330a, (330b) a first feedback calculation for a first rank and (330a, (330b) at least one second feedback calculation for at least one second rank based on the measurements. The first feedback calculation comprises: applying data A first relationship between the assumed transmitted energy and the transmitted energy of the reference signal, the first relationship is specific to the first rank. The second relationship between the assumed transmitted energy of the data and the transmitted energy of the reference signal is specific to at least Specific to a second rank. The receiving node selects (340) a rank based on the feedback calculation and indicates (350) the selected rank to the sending node in a feedback report.

Description

technical field [0001] Generally, the present disclosure relates to methods and apparatus in wireless communication systems. Specifically, it relates to transmission rank adaptation in multi-antenna wireless communication systems. Background technique [0002] In a typical cellular radio communication system (also called wireless communication system), user equipment (also called mobile terminal and / or wireless terminal) communicates via a radio access network (RAN) to one or more core networks. The user equipment may be a mobile station or user equipment unit, such as a mobile telephone (also referred to as a "cellular" telephone) and a laptop with wireless capabilities (e.g. a mobile terminal), and thus may be, for example, a radio access network Portable, small, hand-held, computer-containing or vehicle-mounted mobile devices for voice and / or data communication. [0003] The geographical area covered by the radio access network is divided into cell areas, where each cel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06
CPCH04B7/063H04B7/0619H04B7/0486
Inventor D.哈马瓦尔S.贝格曼G.约恩格伦
Owner TELEFON AB LM ERICSSON (PUBL)