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A method and a system in a cellular network

A cellular and radio system technology, applied in transmission systems, radio transmission systems, time-division multiplexing systems, etc., can solve problems such as no way to distinguish contributions, achieve good quality, reduce interference, and improve communication processing capabilities

Inactive Publication Date: 2000-07-26
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] If two signals, one desired and the other an interfering signal, arrive at the receiver at almost the same time, and their training sequences are the same, in a normal receiver there is simply no way to distinguish their respective contributions

Method used

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  • A method and a system in a cellular network
  • A method and a system in a cellular network
  • A method and a system in a cellular network

Examples

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Embodiment Construction

[0048] Figure 1 illustrates the beam pattern of an antenna array in a cellular TDMA network when there is strong co-sequence interference between two cells using the same frequency and the same training sequence.

[0049] More specifically, FIG. 1 illustrates the structure of a portion of a GSM network comprising five cells 102, 104, 106, 108 and 110, with cells 104, 106 and 108 separating cell 102 from cell 110. The base stations of cells 102 and 110 are indicated at 112 and 114 . Cells 102 and 110 use the same training sequence and the same frequency. Co-sequence interference may therefore occur between base stations 112 and 114, as discussed in more detail below. The training sequences used by the base stations of cells 104 , 106 and 108 are different from each other and different from the training sequences used by cells 102 and 110 .

[0050] The mobile station 116 in the cell 102 transmits a burst to the network, and the base station 112 generates a narrow beam 118 dir...

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Abstract

In a cellular mobile radio system, co-channel radio base stations are provided with a time reference signal being a synchronizing signal or a time reference from another co-channel radio base station. Each co-channel radio base station is also provided with a radio base station specific time offset differing between the co-channel radio base stations by at least a predetermined value which prevents known sequences in desired signals and known sequences in interfering signals from overlapping in a disturbing way at reception. In each co-channel radio base station, the time reference signal and the radio base station specific offset are used for the timing of sending bursts downlink from the co-channel radio base stations towards mobile radio stations. Each radio base station has functions receiving the time reference signal, storing the time offset and using the time reference signal and the time offset for the timing of the burst termination on the downlink.

Description

technical field [0001] In general, a first aspect and a second aspect of the present invention relate respectively to a method and a system for reducing interference in a cellular mobile radio system having a plurality of radio base stations and mobile radio stations. More specifically, these radio base stations use, as transmission units, bursts divided into groups, each group constituting a frame in a Time Division Multiple Access (TDMA) system, each burst consisting of a known sequence of data bits . At least two of the radio base stations are co-channel radio base stations using the same frequency. In a further aspect the invention also relates to a radio base station for a cellular mobile radio system of this type. [0002] related technology [0003] There are many literatures that study how to synchronize the transmission of information (eg time slots, frames, training sequences) to increase the correlation between cells (or radio transmitters). This is true, for ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04J3/06H04W56/00
CPCH04W56/001H04W56/0085H04B7/2693
Inventor H·达姆
Owner TELEFON AB LM ERICSSON (PUBL)
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