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Method, mobile station and base station for transmitting data in a mobile communications system

A mobile communication system and data transmission technology, applied in transmission systems, digital transmission systems, radio transmission systems, etc., can solve problems such as performance degradation, increase feedback overhead, and performance degradation, and achieve the best performance.

Active Publication Date: 2013-11-06
ノキアソリューションズアンドネットワークスゲゼルシャフトミットベシュレンクテルハフツングウントコンパニーコマンディトゲゼルシャフト +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the feedback overhead is minimized by reducing the codebook size, the downside is performance degradation due to suboptimal precoding
[0011] Tracking can reduce feedback overhead, but will limit the achievable accuracy if the codebook size is too small
[0012] For more advanced MIMO algorithms such as joint transmission or nonlinear precoding (where interference will occur between multiple beams and the transmit power and beam angle need to be adjusted very precisely), the small codebook size will lead to performance Severe drop and large codebook size will add too much feedback overhead

Method used

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  • Method, mobile station and base station for transmitting data in a mobile communications system
  • Method, mobile station and base station for transmitting data in a mobile communications system
  • Method, mobile station and base station for transmitting data in a mobile communications system

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Experimental program
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Embodiment Construction

[0044] figure 1 Components of a mobile communication system are shown, the system comprising a base station BS and user equipment UE. Data is transmitted from the base station BS to the user equipment UE on at least one downlink channel DL and from the user equipment UE to the base station on at least one uplink channel UL.

[0045] figure 2 The communication system is shown operating in a first coarse tracking mode. In the following, the description of the present invention is directed to a communication system that employs beamforming as a special type of precoding. Obviously, these embodiments are not limited to this type of communication system but are applicable to all communication systems affected by at least one of the above-mentioned problems.

[0046] figure 2 A communication system operating in the first coarse tracking mode explained above, applying beamforming as a variant of precoding data is described.

[0047] From the predefined set of beams bl-b5, the ...

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Abstract

The present invention provides a method, base station and user equipment for transmitting data in a mobile communications system, wherein said data is transmitted on at least one channel between at least one base station with multiple antennas and at least one user equipment. The base station applies precoding to the data based on a set of predefined codebooks. A first tracking mode with a first codebook from said set of predefined codebooks is used for said precoding, and at least a second tracking mode with at least a second codebook from said set of predefined codebooks is used for said precoding. The base station switches between said first tracking mode and said second tracking mode depending on at least one condition of said channel.

Description

technical field [0001] The invention relates to a method, a mobile station and a base station for transmitting data in a mobile communication system. In particular, the present invention relates to a method for transmitting codebook-based precoded data in a multi-antenna communication system. Background technique [0002] Mobile communication systems (especially wireless cellular systems) are organized in adjacent cells, where each cell is served by a base station (BS). The base station provides communication facilities to and from mobile stations, ie, user equipment (UE). [0003] The Universal Mobile Telecommunications System (UMTS) is one of the third generation (3G) mobile phone technologies. The long term evolution (LTE) of UMTS (ie, the successor technology of 3G, also referred to as fourth generation (4G) technology) is standardized in the 3rd Generation Partnership Project (3GPP). [0004] An important point of LTE is precoding in a multi-antenna communication sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/49H04B7/06
CPCH04B7/0641H04L5/0058H04B7/0669H04L5/0023H04B7/0617H04L5/0037H04B7/0639H04B7/0482
Inventor J·M·艾钦杰V·琼格尼克尔E·舒尔茨W·泽瓦斯
Owner ノキアソリューションズアンドネットワークスゲゼルシャフトミットベシュレンクテルハフツングウントコンパニーコマンディトゲゼルシャフト