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Inter-system handover

A technology of communication system and mobile communication system, which is applied in communication between multiple stations, building components, windows/doors, etc., and can solve problems such as service quality degradation and silent periods

Inactive Publication Date: 2007-05-30
SK TELECOM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, since a gap is stored between the moment of switching the vocoder of the mobile terminal and the moment of switching the vocoder of the mobile communication system, a period of silence occurs during the handover, resulting in a decrease in service quality

Method used

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no. 1 approach

[0040] FIG. 1 shows an embodiment of a mobile communication network to which the present invention is applied and in which an asynchronous mobile communication system and a synchronous mobile communication system coexist.

[0041] 2 and 3 are flowcharts showing inter-system handover processing in the mobile communication system network shown in FIG. 1 according to an embodiment of the present invention.

[0042] With reference to Fig. 1, the mobile terminal 10 of application among the present invention has dual-frequency or dual-mode mobile terminal, and this terminal can be provided for both asynchronous mobile communication service and synchronous mobile communication service, and comprises synchronous modem (for asynchronous mobile communication service) module for communication services), an asynchronous modem (a module for asynchronous mobile communication services) and a common module, and can respectively establish connections with the asynchronous mobile communication s...

no. 2 approach

[0066] FIG. 4 shows another embodiment of a mobile communication system to which the present invention is applied and in which an asynchronous mobile communication system and a synchronous mobile communication system coexist.

[0067] 5 and 6 are flowcharts showing inter-system handover processing in the mobile communication system system shown in FIG. 4 according to another embodiment of the present invention.

[0068] In FIG. 4, since reference numerals refer to the same units as in FIG. 1, a detailed description of them is not required here.

[0069] Referring to Fig. 4, different from Fig. 1, the switching centers 260, 360 of the asynchronous mobile communication system 20 and the synchronous mobile communication system 30 are interconnected with each other by means of the interworking / interoperable functional unit 60, and the interworking / interoperable functional unit 60 will start from The asynchronous message from the asynchronous switching center 260 is converted into ...

no. 3 approach

[0094] 7 and 8 are flowcharts showing the intersystem handover process in the mobile communication network shown in FIG. 3 according to another embodiment of the present invention, wherein the asynchronous switching center and the synchronous switching center are implemented by means of interworking / The interworking functional units are interconnected and use ISUP (messaging protocol between switching centers).

[0095] When the mobile terminal 20 using a voice call within the service area of ​​the asynchronous mobile communication system 30 moves to the service area of ​​the synchronous mobile communication system 30, the mobile terminal 10 detects a signal from the synchronous mobile communication system 30, and periodically measures the signal from the synchronous mobile communication system 30. The signal strength of the Node B of the asynchronous mobile communication system 20 and the signal strength between adjacent transmission areas (or Node Bs) are reported, and the m...

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Abstract

A method of handover in a wireless communication system in which an asynchronous system and a synchronous system are mixed is disclosed. The method comprises the steps of: the asynchronous system ordering a dual mode mobile terminal to perform a handover from the asynchronous system to the synchronous system; when the handover order is received at the mobile terminal, the mobile terminal transmitting a frame or a preamble through a reverse traffic channel to the synchronous system, reporting to the synchronous system that the handover is completed and initiating a timer of the mobile terminal which is set according to a predetermined time; the mobile terminal switching from an asynchronous vocoder into a synchronous vocoder when the timer expires; and the wireless communication system switching vocoders of asynchronous and synchronous MSCs when the report is received.

Description

technical field [0001] The present invention relates to a handover method between different types of mobile communication systems, and in particular, to a handover method in a wireless communication network in which an asynchronous system and a synchronous system coexist. Background technique [0002] The current mobile communication network has such a pattern: the synchronous mobile communication system (CDMA mobile communication system) called 2G or 2.5G communication network and the asynchronous mobile communication system (WCDMA mobile communication system) called 3G communication network coexist in it . [0003] With the continuous development of such mobile communication network technology, a dual-frequency dual-mode terminal (DBDM) that can be used in both a synchronous system and an asynchronous system is currently being developed, and such a mobile terminal enables Synchronize the services of different modes in the service area of ​​the system. The DBDM mobile ter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26
CPCH04W36/0022H04W36/0066H04W36/0061H04W36/14H04W76/38
Inventor 朱宰永朱荣虎金显郁金泳洛
Owner SK TELECOM CO LTD
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