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Radio resource management method in cellular telephone networks

A technology of radio resources and management methods, applied in the field of radio resource management, can solve problems such as incompletely orthogonal coding sequences and CDMA channels being easily affected by adjacent channels

Inactive Publication Date: 2004-09-01
SIEMENS INFORMATION & COMM NEWTWORKS INC
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

CDMA channels are also susceptible to adjacent channel effects since the coded sequences are not perfectly orthogonal for several unpredictable reasons
Unfortunately, in the prior art there is no clear indication of how beamforming can be used at the base station for intelligent allocation of resources to further reduce the average interference

Method used

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  • Radio resource management method in cellular telephone networks
  • Radio resource management method in cellular telephone networks
  • Radio resource management method in cellular telephone networks

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Embodiment Construction

[0028] In the following description, it is considered that the basic unit of a communication network for constructing a communication network is a cell, which is usually modeled with a hexagon, but a cell of any shape is also possible. For the purposes of this invention, the primary question is the location of the BTS within the hexagon, two situations arise:

[0029] 1. BTS is in the center of the hexagon;

[0030] 2. BTS is on the edge.

[0031] 8a to 8e, the first step in the direction of the present invention is to subdivide the hexagon into K areas, where K is the number of BTSs included therein, and one BTS corresponds to one cell. That is, K is the number of cells supported by each hexagon. For K≠1, the shape of the cells differs from that of a hexagon. The number K depends on the business problem and, therefore, on the trade-off between cost (number of BTSs) and capacity. The second step consists in subdividing each cell into N sectors with a common apex at the BTS...

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Abstract

The Radio Resource Management (RRM) operates in a cellular network either of the the 2 or 3 generation in order to bias TDMA traffic towards prefixed directions of sectored cells. The network is built up by replicating a network base element over a wide synchronised area. The base element includes one or more sectored cells either disjoint or superimposed to each other. The base stations exploit directive antennas able to cut out the gain for sectoring the cells and measuring the directions of arrival (DOA) of the users signals. The RRM plans the transmissions of the mobiles and the serving BTSs by allocating the available timeslots to sectors which don't overlap, as far as possible, the sectors of adjacent or superimposed cells during a same active timeslot. The last is also allocated to the users whose DOAs best match with the angular positions of the relevant sectors. A suitable configuration table is generated by mapping a subset of the possible allocations between cell / s, sectors, and timeslots. Starting from the selection of an initial configuration in the table, suitable spatial functions are generated to define the configurations of all the adjacent elements, in order to achieve maximum interference rejection.

Description

technical field [0001] The present invention relates to the field of cellular telephone networks, more precisely to a method of radio resource management in cellular networks based on interference suppression time slot allocation. Background technique [0002] In a Public Land Mobile Network (PLMN) a large area is subdivided into serving cells assigned to an equal number of fixed stations connected by radio to several mobile stations (MS) transmitting in the cell. Hereinafter, fixed stations are also named base station (BS), base transceiver station (BTS) and NODEB (Node B), and MS are also named user equipment (UE) according to the 3rd generation naming rules. Between the base station and the mobile station, an air interface is defined for radio transmissions on the licensed spectrum. The air interface includes, for transmissions from the BS to the MS, physical channels, conventionally referred to as the downlink, or direct link channels, and for transmissions from the MS ...

Claims

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Application Information

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IPC IPC(8): H01Q1/24H01Q3/26H04W16/02H04W16/12H04W16/24H04W16/28
CPCH01Q1/246H01Q3/2605H04W16/02H04W16/28H04M2215/2026H04W4/24H04M2215/32H04W16/24H04W16/12
Inventor 布鲁诺·齐里利
Owner SIEMENS INFORMATION & COMM NEWTWORKS INC
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