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A method and a device for enhanced performance in a cellular wireless TDD system

A cellular wireless and access system technology, applied in the field of cellular wireless access systems, can solve problems such as untargeted RBS interference

Inactive Publication Date: 2009-12-23
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this disclosure is not aimed at solving the problem of RBS to RBS interference

Method used

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  • A method and a device for enhanced performance in a cellular wireless TDD system
  • A method and a device for enhanced performance in a cellular wireless TDD system
  • A method and a device for enhanced performance in a cellular wireless TDD system

Examples

Experimental program
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Embodiment Construction

[0039] figure 1 An example of a wireless access system 100 in which the present invention can be applied is shown. figure 1 The system 100 shown in is a cellular radio system comprising multiple cells in figure 1 Two of these cells are shown with reference numerals 110 and 210 in .

[0040] It should be noted that although system 100 is shown in the figures, in the following description, and in some of the other figures as a cellular wireless system, this is not intended to limit the scope of protection given herein, so The system 100 described above should only be considered as an example to facilitate the reader's understanding of the present invention. The invention can equally well be applied to other kinds of wireless access systems.

[0041] Said cells 110, 210 each comprise at least one radio base station RBS, which is located in figure 1 are shown as 120 and 220 in. The RBSs 120, 220 are used in particular to control traffic to and from user terminals in their cor...

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PUM

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Abstract

The invention discloses a method (1100) for a cellular wireless access TDD system (100) with a base stations (120, 220) for respective cells (110, 210) in the system, where each cell can accommodate at least a first user terminal (130, 230). The user terminals can receive traffic from their base stations during a down link period, and can transmit traffic to their base stations (120, 220) during an up link period (UL). There is a first guard period (TDu) at the transition from down link to up link, and a second guard period (TUD) at the transition from up link to down link. The method comprises measuring the interference level in a second plurality (110, 210) of cells during part of the time between two consecutive down link periods, and varying the duration of said first and / or second guard period in said second plurality of cells (110, 210) according to the interference level.

Description

technical field [0001] The present invention discloses a method for use in a cellular radio access system comprising a first plurality of radio base stations for controlling traffic to and from corresponding cells in the system. Background technique [0002] In future cellular radio access systems as well as in some contemporary systems, one principle that can be used is called the TDD principle, Time Division Duplexing. In a TDD system, transmissions from the base station to the user terminals within the cell ("downlink") and transmissions from the user terminals to the base station ("uplink") are carried out on the same frequency, except that separated in time. [0003] Due to the principle employed, in a TDD system there may be interference between the uplink and the downlink since both are on the same frequency. Thus, for example, a user terminal that is transmitting uplink to a base station may cause interference to another user terminal in a neighboring cell that is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26
CPCH04B7/2656
Inventor D·阿斯特利P·斯吉勒马克T·泰恩德费尔特E·韦斯特伯格H·埃克斯特伦
Owner TELEFON AB LM ERICSSON (PUBL)