Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2000-03-15
2004-08-03
Qureshi, Afsar (Department: 2667)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S322000, C370S328000, C455S428000, C455S439000
Reexamination Certificate
active
06771621
ABSTRACT:
CLAIM OF PRIORITY
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. Section 119 from an application for “Method for Allocating Link Resources between Mobile Switching Center and Base Station” filed in the Korean Industrial Property Office on Mar. 15, 1999 and there duly assigned Ser. No. 99-8560.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a method for allocating link resources between a mobile switching center and a base station, and in particular, to a method for allocating a link resource designated by a base station upon a handoff failure, to perform an inter-system handoff.
2. Description of the Related Art
FIG. 1
shows a conventional procedure for allocating a link resource between a mobile switching center (MSC) and a base station (BS). As illustrated, a mobile switching center
11
sends a handoff request message to a base station
12
in step S
11
, and upon receipt of the handoff request message, the base station
12
sends a handoff response message to the mobile switching center
11
, in step S
12
, to inform the acceptance of the handoff request.
The IS-634A base station
12
can designate a specific resource by sending the mobile switching center
11
resource allocation information together with a configuration module service request message and a paging resource message including a circuit identification code. Therefore, except where the mobile switching center
11
cannot allocate a specific resource designated by the base station
12
for call termination and origination, the mobile switching center
11
can normally allocate the resources, thereby increasing the resource allocation efficiency of the base station
12
, requires allocation of different resources according to the services.
However, this is applicable only to the call termination or origination but cannot be applied to the inter-system handoff which requires the allocation of new resources. Therefore, the base station
12
, which has the authority to freely allocate the resources for the call termination/origination, is deprived of that authority. Thus, the mobile switching center
11
should implement the resource allocation function.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a method for enabling a base station to allocate link resources used between a mobile switching center and the base station not only during the call termination and origination but also during an inter-system handoff.
To achieve the above object, there is provided a method for allocating a link resource between a mobile switching center and a base station. The method comprises the steps of: (a) sending a handoff request message including information about a link resource requested by the mobile switching center, from the mobile switching center to the base station; (b) sending a handoff response message from the base station to the mobile switching center when the link resource requested by the mobile switching center is available for a service; (c) sending a handoff fail message including information about a new link resource requested by the base station, from the base station to the mobile switching center, when the link resource requested by the mobile switching center is unavailable for the service; (d) sending a resource allocation request message from the mobile switching center to the base station when the link resource requested by the base station is available; (e) sending a resource allocation request message including information about a new link resource requested by the mobile switching center from the mobile switching center to the base station, when the link resource requested by the base station is unavailable; (f) sending the handoff response message from the base station to the mobile switching center when the link resource included in the resource allocation request message from the mobile switching center is available; and (g) repeating steps (c) to (f), when the link resource included in the resource allocation request message from the mobile switching center is unavailable. The link resource information is included in the circuit identification code extension information.
REFERENCES:
patent: 5175867 (1992-12-01), Wejke et al.
patent: 5794149 (1998-08-01), Hoo
patent: 5873036 (1999-02-01), Vucetic
patent: 5937353 (1999-08-01), Fapojuwo
patent: 5940762 (1999-08-01), Lee et al.
patent: 6212389 (2001-04-01), Fapojuwo
patent: 6445911 (2002-09-01), Chow et al.
Cha & Reiter LLC
Qureshi Afsar
Samsung Electronics Co LTD
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