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Rank adaptation for an open loop multi-antenna mode of wireless communication

A wireless communication, multi-antenna technology, applied in wireless communication, radio transmission system, network traffic/resource management, etc., can solve the problem that precoding is not beneficial

Active Publication Date: 2010-08-25
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Precoding for closed-loop MIMO transmission may not be beneficial as the speed of the mobile station increases

Method used

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  • Rank adaptation for an open loop multi-antenna mode of wireless communication
  • Rank adaptation for an open loop multi-antenna mode of wireless communication
  • Rank adaptation for an open loop multi-antenna mode of wireless communication

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Embodiment Construction

[0012] In the following description, numerous details are set forth to provide an understanding of some embodiments. However, those skilled in the art will understand that some embodiments may be practiced without these details and that many variations or modifications from the described embodiments may be possible.

[0013] In a wireless network incorporating some embodiments of the present invention, various multi-antenna modes may be supported on a downlink radio channel (from base station to mobile station), such as the Physical Downlink Shared Channel (PDSCH ) or other types of data channels. The PDSCH channel is a channel existing in a Long Term Evolution (LTE) wireless network defined by the Third Generation Partnership Project (3GPP). 3GPP LTE technology is an evolution of UMTS (Universal Mobile Telecommunications System) technology, which is also announced by 3GPP. Although reference is made to LTE technology according to some embodiments, it is noted that these tec...

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Abstract

To perform rank adaptation for a mobile station in a wireless network, it is determined whether the mobile station is fast moving. In response to determining that the mobile station is fast moving, an open loop multi-antenna mode is selected to perform wireless communication between the mobile station and a base station. Also, selection is made from among plural ranks for the wireless communication according to the open loop multi-antenna mode between the mobile station and the base station.

Description

technical field [0001] The present invention generally relates to rank adaptation of an open-loop multi-antenna pattern for wireless communication between a mobile station and a base station. Background technique [0002] Various wireless access technologies have been proposed or implemented to enable mobile stations to communicate with other mobile stations or with wired terminals coupled to a wired network. Examples of wireless access technologies include GSM (Global System for Mobile Communications) and UMTS (Universal Mobile Telecommunications System) technologies defined by the Third Generation Partnership Project (3GPP); and CDMA2000 (Code Division Multiple Access 2000) technologies defined by 3GPP2 definition. [0003] As part of the continued evolution of wireless access technologies to increase spectral efficiency, improve services, reduce costs, etc., new standards have been proposed. One such new standard is the Long Term Evolution (LTE) standard from 3GPP, whic...

Claims

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Application Information

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IPC IPC(8): H04W28/18H04W72/06
CPCH04B7/0689H04B7/063H04B7/0632H04B7/0667H04B7/0697
Inventor H·徐J·吴J·马M·贾M·巴利P·朱W·童
Owner APPLE INC