Method and apparatus for hand over of calls

Details Method and apparatus for hand over of calls Method and apparatus for hand over of calls

2006-04-18

2006-04-18

Hsu, Alpus H. (Department: 2665)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S338000, C370S465000, C455S436000

Reexamination Certificate

active

07031280

ABSTRACT:
A wireless communication unit (101, 200), network switch (112, 300) and corresponding methods facilitate routing and handover or handin of calls from a second network (105) to a first network (103) when the unit has been operating in second network and is being handed in to the first network. The communication unit comprises a transceiver (203) and a controller (209) arranged to operate with the transceiver to determine (503) that the wireless communication unit is within a coverage area of the first network; to exchange messages (505, 507) corresponding to call appearance information with the switch in the first network; to decide whether a call within the second network can be handed in to the first network based on the exchange of the messages (507); and to initiate (519, 619) a handin of the call to the first network only when the decision is affirmative.

REFERENCES:
patent: 2002/0141358 (2002-10-01), Requena
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patent: 2003/0125021 (2003-07-01), Tell et al.
patent: 2003/0134650 (2003-07-01), Sundar et al.
patent: 2003/0137962 (2003-07-01), Tsirtsis et al.
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patent: 2004/0264410 (2004-12-01), Sagi et al.
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R. Sparks; “The SIP Refer Method draft-ietf-sip-refer-07”; Network Working Group; pp. 1-21.

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