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Decision mechanism for handover execution in a cellular radio communications system

一种蜂窝通信系统、判决的技术，应用在无线通信、无线电/感应链路选择安排、电气元件等方向，能够解决降低网络性能、延迟等问题，达到提高网络性能、消除快速波动的效果

Active Publication Date: 2007-10-03
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some systems, a hysteresis algorithm is applied to the comparison of signal strength measurements, which prevents this ping-pong effect, but on the other hand, the hysteresis algorithm causes unnecessary delays for handovers not affected by the ping-pong effect, which also reduces network performance

Method used

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  • Decision mechanism for handover execution in a cellular radio communications system
  • Decision mechanism for handover execution in a cellular radio communications system

Examples

Experimental program
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Embodiment Construction

[0026] Fig. 1 shows a detection step S1 which provides information I1, a decision step S2 which provides a decision D2, and an execution step S3.

[0027] The detection step is typically used to evaluate the need for handover caused by mobility or traffic load balancing, eg when a mobile device moves between cells or when the traffic load of a cell reaches a certain threshold. The detection step S1 can be triggered by the mobile device or from the network side. The detection step S1 may detect the number of candidate target cells and even select one of these candidate target cells eg depending on the radio signal strength received by the mobile device. In some systems, this step also includes the ability to distribute load-induced handoffs in a fair manner among all potential mobile devices and / or to, for example, by introducing predetermined thresholds or hysteresis levels and associating these levels timers to smooth out rapid fluctuations in radio signal strength reception...

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Abstract

The invention relates to a method of taking a handover decision in a cellular communications system comprising a communications network divided into a plurality of cells, the communication between the communications network and a plurality of mobile devices located in a specific cell thereof being supported by at least one access point in each cell, the communications network detecting a need for initiating a handover for at least one mobile device from a source cell to a selected target cell, and further calculating a virtual traffic load indicator for the source cell after a virtual handover execution of the mobile device from said source cell to said target cell, calculating a virtual traffic load indicator for the target cell after a virtual handover execution of the mobile device from said source cell to said target cell, comparing the calculated virtual traffic load indicators, and taking a decision to execute or not to execute said handover according to said comparison. The invention also relates to a network element and a communications network comprising means to implement the above described method.

Description

technical field [0001] The present invention relates generally to handover mechanisms in cellular radio communication systems, and more particularly to a method for deciding whether to perform a handover. Background technique [0002] In a cellular radio communication system, the coverage area of ​​a communication network is divided into a number of cells, and communication between said communication network and mobile devices located in a particular cell thereof is supported by at least one access point in each cell . Handover mechanisms are commonly used in said cellular communication systems to provide seamless service coverage to a mobile device as it moves from one cell to another, but the handover algorithm may not be limited to the management of the mobility of the mobile device. Handover may also be performed for network traffic load balancing purposes. [0003] Load balancing between access points is required because each access point has a finite capacity. The c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04Q7/22H04W36/38
CPCH04W36/22H04W36/38H04W36/0033
Inventor E·W·屈恩A·安布罗西
Owner ALCATEL LUCENT SAS
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