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Extended coordinated multipoint cells to mitigate inter-comp-cell downlink interference

A downlink, cell technology, applied in the field of reducing inter-cell interference, and can solve problems such as the existence of bonding areas

Active Publication Date: 2015-03-25
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although a CoMP system can be effective in minimizing intra-CoMP cell interference, inter-CoMP cell interference still exists along the joint region between adjacent CoMP cells

Method used

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  • Extended coordinated multipoint cells to mitigate inter-comp-cell downlink interference
  • Extended coordinated multipoint cells to mitigate inter-comp-cell downlink interference
  • Extended coordinated multipoint cells to mitigate inter-comp-cell downlink interference

Examples

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Embodiment Construction

[0012] figure 1 Depicted is the network 10 divided into two adjacent CoMP cells 12, 24, only a portion of each cell is depicted. The first CoMP cell 12 comprises a controller 14 and fixed transceivers located eg at base stations 16 , 18 . Base stations 16 , 18 (each of which may comprise sub-cells) transmit downlink signals to user equipment 20 , 22 located in CoMP cell 12 . As is known in the art, controller 14 applies signal processing techniques, such as frequency-dependent beamforming, to construct a signal for transmission to UE 22 , where this signal is transmitted by transceivers located at base stations 16 and 18 . The signal transmitted to the UE 22 is structured to maximize the data rate to the target UE 22 while at the same time keeping the interference caused to other UEs in the CoMP cell 12 below a certain threshold, thereby reducing intra-CoMP cell interference. Transmissions to UE 22 in CoMP cell 12 are similarly structured to maximize the data rate received b...

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Abstract

Inter-CoMP cell interference is reduced by "extending" at least one CoMP cell to include UEs served by a neighboring CoMP cell in the extended CoMP cell's transmission calculations, so as to minimize interference to the UEs served by other CoMP cells. Each UE in a border sub-cell identifies neighboring CoMP cells from which it receives interference in excess of a threshold value, and includes the interfering CoMP cells in a close-neighbor set. The close-neighbor set is transmitted to the UE's serving CoMP cell controller. When downlink transmissions are scheduled to the target UE, the controller notifies the neighboring CoMP cells in the close-neighbor set, identifying the target UE. Those CoMP cells then use information about the channel conditions from their transmit antennas to the target UE receive antennas to compute transmissions to UEs they serve, with the constraint that interference to the target UE is below a predetermined level.

Description

technical field [0001] The present invention relates generally to wireless cellular communications, and in particular to systems and methods for mitigating inter-cell interference by increasing the range of coordinated multipoint cells. Background technique [0002] Wireless cellular communication networks are nearly ubiquitous and provide mobile voice and data communications to thousands of subscribers. In a cellular network, fixed transceivers (base stations, NodeBs, etc.) provide two-way radio communication with multiple subscribers within a geographical area or cell (the term partition is used herein synonymously with cell). Methods of suppressing radio interference within a cell, such as time division multiplexing, frequency division multiplexing and code division multiplexing and combinations thereof, are known in the art. Furthermore, methods of suppressing inter-cell interference, such as frequency reuse patterns, are known in the art. In modern wireless cellular c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/70H04W72/12
CPCH04L5/0091H04W72/1231H04B7/024H04L5/0066H04W72/542
Inventor K·赞吉桂建卿许清汉
Owner TELEFON AB LM ERICSSON (PUBL)
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