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Reduction of interference in mobile telecommunications systems

A mobile communication system, scrambling technology, applied in transmission systems, wireless communications, electrical components, etc., can solve problems such as not providing guidance

Active Publication Date: 2013-07-17
ALCATEL LUCENT SAS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The aforementioned 3GPP standard specifications do not provide any guidance on the matter

Method used

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  • Reduction of interference in mobile telecommunications systems
  • Reduction of interference in mobile telecommunications systems
  • Reduction of interference in mobile telecommunications systems

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Experimental program
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Embodiment Construction

[0026] Embodiments of the present invention address the problem of automatic downlink scrambling structures for small cell base station routers (BSRs).

[0027]According to the definition in 3GPP (TS25.104), cells are usually classified by cell radius and maximum output power. A macro cell can be thought of as a cell where the base station antenna is mounted on a pole or building above average roof level. Microcells are cells with antenna heights below average rooftop level, which are typically used in urban areas. A picocell is a small cell covering several tens of meters in diameter, which is mainly used indoors. A femtocell is a cell designed for use primarily in a residential or small business environment and is connected to a service provider's network via a broadband Internet connection. Umbrella cells are used to cover shadow areas of smaller cells and to fill gaps in coverage between the cells. For the purposes of the present invention, a "small cell" is considered ...

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Abstract

A method of reducing interference from neighboring cells, by optimizing transmission Primary Scrambling Codes (PSC) within a small cell of a mobile telecommunications system, comprising: performing a network listening operation in the small cell to monitor transmissions of neighboring cells, and determining scrambling codes and timing offsets of such transmissions; and providing, either (1) by means of a cross-correlation matrix determined in an initial characterizing step, or (2) by means of a real-time cross-correlation process, a Primary Scrambling Code and a timing offset, in dependence on the cross-correlation values of determined codes and timing offsets of the neighboring cells with codes and offsets that may be used by the small cell, does and offsets for the small cell which have a reduced likelihood of interference with transmissions of the neighboring cells.

Description

technical field [0001] The present invention relates to mobile communication systems and in particular to the reduction of intra-cell interference of such systems, which interference may be caused by transmissions from neighboring cells. Background technique [0002] In the third generation wireless mobile communication, especially in Universal Mobile Telephone System (UMTS, Universal Mobile Telephone System) and other systems using CDMA, the RF transmission between the base station and the user equipment is limited to two main code operations. First, the extended use of channelization codes, known as CDMA, is applied to separate individual transport channels. [0003] Second, a scrambling code is applied to transmissions in order to distinguish transmissions within one cell from the neighboring cells. The requirements for scrambling codes and channelization codes are stated in the standard 3GPP TS25.213V9.1.0 (2009-12). However, it has been found that there is a risk of i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/7097H04J13/16H04W24/02
CPCH04W24/02H04B2201/709709H04J13/16H04B1/707
Inventor 马利克·沙希德霍尔格·克劳森路易斯·格温·塞缪尔莱斯特·T·W·何
Owner ALCATEL LUCENT SAS
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