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Small-zone switching-over method

A cell handover and inter-cell technology, applied in electrical components, wireless communications, etc., can solve problems such as high network coverage costs, large location changes, and inability to accurately determine the location of MSs, so as to improve handover sensitivity and success rate, reduce The area covered by cell overlap and the effect of reducing the area covered by cell overlap

Inactive Publication Date: 2010-05-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) The distance between the MS and the center of the cell can be estimated by using TA, but the precise location of the MS cannot be known. The measurement report reported by the MS contains information such as the signal quality and signal level of the MS. However, due to the complexity of the wireless channel, the network The side cannot accurately determine the location of the MS according to the measurement report reported by the MS, that is, it cannot accurately determine whether the MS is at the edge of the cell
In the prior art, since the handover decision is made according to the fuzzy location of the MS, sometimes the network side initiates handover before the MS reaches the edge of the cell, or the MS has left the coverage area of ​​the cell, but the network side has not yet initiated handover, resulting in MS Poor signal quality, dropped calls, etc.
[0007] 2) For a fast-moving MS, the position of the MS will change greatly during the period from when the handover decision is triggered to when the handover command is issued. As a result, the MS cannot receive the handover command correctly and calls are dropped
[0008] 3) In the GSMR network, since the moving speed of the train is relatively fast, in order to avoid call drop, the overlapping coverage area of ​​the cell needs to be large, and the network coverage cost is correspondingly high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: Handover based on location in GSM network.

[0046] This embodiment is applicable to networks with linear coverage, such as GSMR networks.

[0047] See figure 1 , figure 1 It is a schematic diagram of the location-based handover process in the GSMR network. Such as figure 1 As shown, the implementation process of handover based on location in the GSMR network is as follows:

[0048] Step 101: Mobile Switching Center (MSC, Mobile Switch Center) sends a message to the MS through a task registration (REGISTER) message, carrying a location threshold in the message, and notifying the MS to report when reaching the specified location threshold, which is pre-set by the MSC. The location threshold includes one location point or two location points, and one location point is represented by a latitude and longitude. In practical applications, if a cell has only one neighbor cell, you can set a location threshold that includes only one location point for the MS ...

Embodiment 2

[0060] Embodiment 2: Handover based on location and moving direction in GSM network.

[0061] When there are multiple adjacent cells around a cell, sometimes it is difficult to judge the target cell for handover only by the position of the MS. When making a handover decision, combined with the MS's moving direction method, sometimes frequent handovers can be avoided. For example, when the MS reaches the location threshold, but it is determined to move to the cell according to its moving direction, the MS may not be handed over, and the MS is still determined by the MS. The cell to which the MS originally belongs provides services.

[0062] Embodiment 2 is applicable to networks with linear coverage, or networks with non-linear coverage and only one layer of cells.

[0063] See image 3 , image 3 It is a schematic diagram of the handover process based on location and moving direction in the GSM network. Such as image 3 As shown, the implementation process of switching ba...

Embodiment 3

[0077] Embodiment 3: Handover based on location and moving speed in GSM network.

[0078] In addition to the method of handover based on the position of the MS or based on the position and direction of movement of the MS, the handover decision can also be made in combination with the mobile rate of the MS. At this time, the MSC can determine the target cell for handover according to the mobile rate of the MS. In a network covered by layer networks, it can be judged according to the moving speed of the MS whether to switch it to an adjacent cell on a different layer or to an adjacent cell on the same layer, and when making a decision based on the moving speed of the MS, it can be According to the speed of the MS's moving speed, set the position threshold for the MS far or close to the edge of the cell.

[0079] See Figure 7 , Figure 7 It is a schematic diagram of the handover process based on position and moving speed, that is, moving direction and moving speed in the GSM n...

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Abstract

The method includes steps: (1) network side sets up threshold value of position for mobile station; and informing the set up threshold value of position to mobile station; (2) mobile station monitorsand determines whether own position reaches to the threshold value of position in step (1) in real time; when reaching the threshold value of position, mobile station makes report to network side; (3)after receiving report in step (2), network side switches mobile station between adjacent cells. Based on accurate position, the invention makes mobile station switch between adjacent cells.

Description

technical field [0001] The invention relates to handover technology in a mobile communication system, and particularly designs an inter-cell handover method. Background technique [0002] When the mobile station (MS, Mobile Station) moves in the mobile communication network, usually in order to keep the MS in the best coverage area, in order to obtain better call quality, higher bandwidth, and to reduce the call drop rate of the MS, etc., The network side will allow the MS to switch between adjacent cells, that is, switch the MS from the original cell to its adjacent cell. The cell to which the MS originally belongs and its neighbor cells are neighbor cells, also referred to as neighbor cells. The two neighbor cells may be cells on the same floor or cells on different floors. Different layers of cells exist in a mobile communication network covered by a multi-layer network. The so-called multi-layer network coverage means that the coverage area of ​​one layer of cells is su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/00H04W24/08H04W24/10H04W36/32
Inventor 袁毅王超
Owner HUAWEI TECH CO LTD
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