Small area selection

A kind of community, the selected technology, applied in the direction of selection device, radio/inductive link selection arrangement, electrical components, etc., can solve unsolvable problems, achieve the effect of small possibility, reduce risk, and shorten waiting time

Inactive Publication Date: 2003-04-02
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technique can effectively reduce the interference level within the system, but it does not solve the problems related to the load threshold mentioned above

Method used

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  • Small area selection
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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0107] In a first embodiment of the cell selection technique, each base station broadcasts its congestion level at regular intervals in the following one or more radio frames. The mobile unit receives these broadcast messages and whenever the signal quality difference between two cells falls below a certain threshold, the mobile unit selects the cell with the lowest degree of congestion.

[0108] This embodiment is realized based on the realization that if the load of one effective cell is much lower than that of another effective cell, in some cases, the cell with the lower load is actually preferentially used, even if the signal in this cell The quality is not as good as the signal quality in another cell.

[0109] image 3 The parts of the base station that transmit signals to the mobile unit in the first embodiment are shown. Base station 50 includes: data buffers 52, 52', 52", congestion level measurement unit (CLMU) 54, multiplexer 56, multiplexer 58, spreader 60, 62, ...

no. 2 example

[0148] In a second embodiment of the cell selection technique, data is transmitted from a base station to several mobile units using a common transmission channel. A mobile unit located in the soft handoff zone monitors the shared transmit channel transmitted by the active base station to obtain a measure of the degree of congestion in the cell. Whenever the signal quality difference between two cells falls below a certain threshold, the mobile unit selects the less congested cell.

[0149] Figure 5 Sections that transmit signals to the mobile unit base station in the second embodiment are shown. The base station 120 includes: data buffers 122, 122', 122", multiplexer 128, spreader 130, transmitter 132, duplexer 134, antenna 136, receiver 138, despreader 140, demultiplexer 142 and controller 144.

[0150] In operation, data packets destined for 3 different mobile units are received from the radio network controller and buffered in the buffers 122, 122', 122". According to ...

no. 3 example

[0161] In a third embodiment of the cell selection technique, the degree of cell congestion is measured by the base station, and if the cell is too congested, the base station does not transmit data to a particular mobile unit even if the mobile unit has selected that base station for data transmission. The base station waits for its cell to be uncongested before sending the data packet, or utilizes another base station to send the data packet.

[0162] Figure 7 Parts of a base station according to the third embodiment for transmitting signals to mobile units are shown. Base station 200 includes: data buffer 202, congestion level measurement unit (CLMU) 204, multiplexers 205, 205', 205", spreader 206, combiner 208, transmitter 210, duplexer 212, antenna 214, Receiver 216 , despreader 218 , demultiplexer 220 and controller 222 .

[0163] In operation, data packets for transmission to the mobile unit are received from the radio network controller and buffered at buffer 202 . ...

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Abstract

Cell selection techniques for use in cellular communications systems are disclosed. A decision as to whether to use a cell for data transmission is made in dependence on a measure of a congestion level in the cell. The decision may either be part of a cell selection decision, or used to override a cell selection decision. The techniques may be used in fast cell site selection.

Description

technical field [0001] The present invention relates to cell selection in a cellular mobile communication system, and more particularly, the present invention relates to fast cell site selection during soft handover. Background technique [0002] In a cellular mobile communication system, each base station corresponds to a cell covering a specific area ("footprint"). Mobile units within the coverage area of ​​a cell communicate with the system by sending radio signals to and receiving radio signals from the cell's associated base station. The shapes and sizes of the different cells can vary and can change over time. The respective coverage areas of adjacent cells typically overlap each other such that a mobile unit can communicate with more than one base station at any given time. [0003] Within each cell, the base station is required to signal each called user (ie, each active mobile unit) in a multi-user and multi-path environment. In order to achieve satisfactory sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04W36/18H04W36/22
CPCH04W36/22H04W36/18H04W36/30
Inventor 苏尼尔·K·瓦格马
Owner FUJITSU LTD
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