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Fast synchronised handover method and system

A technology of switching response and switching request messages, which is applied in transmission systems, digital transmission systems, electrical components, etc., and can solve problems such as call loss

Inactive Publication Date: 2011-07-06
NOKIA SIEMENS NETWORKS GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] However, excessive service interruption at the time of changeover can lead to lost calls, which should be avoided

Method used

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  • Fast synchronised handover method and system
  • Fast synchronised handover method and system
  • Fast synchronised handover method and system

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Embodiment Construction

[0030] Within the field of mobile communications, different handover schemes have been proposed to solve the handover problem.

[0031] Predictive Rerouting Handover

[0032] The predictive rerouting handover scheme predicts new potential base stations BS based on information stored in the location management system. These BSs join a group of BSs that form a multicast tree that is initially established when a mobile device registers with the network. This group is updated as the device passes through the coverage area of ​​the network. In this group, the serving BSs are called active and the remaining BSs are called inactive. Handover is triggered when the MT fails to receive the beacon signal of the BS it is serving for several times. When this happens, the new BS becomes active and updates the multicast tree. The multicast tree can be used to send data packets in two different ways: one where the packets are sent only to active BSs, and another where the packets are tr...

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Abstract

The present invention relates to a fast synchronised handover method and system. A mobile communications system (100) adapted to perform handover, comprises at least one mobile terminal (200), a plurality of base stations (300a - 300e), at least one central entity (400) adapted to manage the plurality of base stations, adapted to perform a handover, wherein: - the mobile terminal (200) is adapted to transmit a handover request message in a pre-defined slot requesting a new point of attachment; - the plurality of base stations (300a - 300e) are adapted to receive the handover request message and further adapted to determine which one of the plurality of base stations (300a - 300e) is to become the new point of attachment; - a base station (300a) arranged to become the new point of attachment is further adapted to transmit a handover response message to the mobile terminal (200); - the mobile terminal (200) is adapted to receive the handover response message and to change its point of attachment.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 200680018431.4 filed on November 26, 2007 by the applicant Nokia Siemens Networks Co., Ltd., with the title of "Fast Synchronous Handover Method and System". technical field [0002] In a mobile communication network, the present invention is used to ensure fast and transparent handover without causing service loss and without wasting channel resources. Background technique [0003] In the existing mobile communication system, handover HO is a very important function, whereby the mobile terminal MT changes its point of attachment AP (point of attachment). Functions characterized by multi-hop communication and using Orthogonal Frequency Division Multiple Access (OFDMA) are also important functions in mobile communication systems. Those skilled in the art will understand that other terms such as "access point", "base station", "network attachment point", "relay node", etc. may be used instead...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/00H04W4/06H04W36/08H04W36/12H04W74/04
CPCH04W36/0055H04W74/04H04W4/06H04L5/023H04W36/0007H04W36/0005
Inventor M·洛特
Owner NOKIA SIEMENS NETWORKS GMBH & CO KG
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