Method for performing active cancellation of inter-cell interference in a cellular wireless access system

An inter-cell interference, cellular technology, applied in radio transmission systems, transmission systems, wireless communications, etc., can solve the problems of rough start time interval, wireless resource scheduling application, unsatisfactory training sequence allocation, etc., to achieve the effect of low overhead

Inactive Publication Date: 2007-09-12
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] Conversely, in case the overhead from the training pilot tones for inter-cell interference cancellation should be kept low, the spacing of the start times for OFDMA allocations must be coarse, which imposes a heavy burden on radio resource scheduling. Strong restrictions
[0019] Therefore, this standard way of allocation of training sequences for effective inter-cell interference cancellation does not meet the requirements stated above

Method used

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  • Method for performing active cancellation of inter-cell interference in a cellular wireless access system
  • Method for performing active cancellation of inter-cell interference in a cellular wireless access system
  • Method for performing active cancellation of inter-cell interference in a cellular wireless access system

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no. 2 approach

[0064] For the second embodiment, an equivalent mechanism can be used in the downlink direction, where the subscriber station provides a dedicated pilot tone on the allocation corresponding to the downlink allocation of the subsequent downlink frame in which link frame, they will receive payload data. Using these pilot tones for adaptive processing of base stations equipped with beamforming techniques, an adaptive beam pattern will then be formed for each downlink allocation in order to minimize inter-cell interference through localization of appropriate nulls .

[0065] Also for the second embodiment, the same mechanism can be used in the downlink direction, so that the base station can use the method according to the invention when transmitting data in the downlink and providing processing for interference cancellation by the subscriber station.

[0066] Fig. 3a shows a pilot tone arrangement according to a third embodiment of the present invention. The invention will be d...

no. 4 approach

[0086] For the fourth embodiment, an equivalent mechanism can be used in the downlink direction, where the subscriber station provides a dedicated pilot tone on the allocation corresponding to the downlink allocation of the subsequent downlink frame, where in the subsequent downlink frame On the road frame, they will receive the payload data. Using these pilot tones for adaptive processing of base stations equipped with beamforming techniques, an adaptive beam pattern will be formed for each downlink allocation in order to minimize the inter-cell interference.

[0087] Also for the fourth embodiment, the same mechanism can be used in the downlink direction, so that the base station can use the method according to the invention when transmitting data in the downlink and providing processing for interference cancellation by the subscriber station.

[0088] According to another embodiment of the present invention, the principles of the present invention can be used to comply wit...

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Abstract

The present invention relates to a method for improving inter cell interference cancellation in an cellular radio communication system, said cellular radio communication system sending OFDM frames on an air interface, each OFDM frame comprising a pilot tones part and a payload part comprising a plurality of bursts. According to the present invention, the method comprising the step of: Sending on a sub channel a first set of pilot tones by the station sending a burst on said sub channel; Sending additionally in said frame and on said sub channel a second set of pilot tones by an additional station when a burst sent by said additional station starts on said sub channel. The present invention relates to a method for improving inter cell interference cancellation in an cellular radio communication system, said cellular radio communication system sending OFDM frames on an air interface, each OFDM frame comprising a pilot tones part and a payload part comprising a plurality of bursts.

Description

[0001] Cross References to Related Applications [0002] The present invention is based on the prior application EP 06300196.0, hereby incorporated by reference. technical field [0003] The present invention relates to a method for performing efficient cancellation of inter-cell interference in a cellular radio communication system. Background technique [0004] In cellular wireless communication systems, short frequency reuse distances provide optimization of resource usage. Using short frequency reuse distances results in a large amount of inter-cell interference that must be addressed. Effective cancellation of inter-cell interference is required to ensure the efficiency of such high-capacity networks based on eg OFDMA (Orthogonal Frequency Division Multiple Access) air interfaces. [0005] The usual interference cancellation method consists in coordinating resource allocation among different neighboring base stations in such a way as to minimize interference, this int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04B1/707H04J13/02H04W72/08
CPCH04W72/08H04B1/7097H04B7/0617H04W72/54H04J11/00
Inventor R·明茨纳
Owner ALCATEL LUCENT SAS
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