Semi-hard handoff in a cellular telecommunications systems
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United States of America Patent
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-
Aug 4, 1998
Grant Date -
N/A
app pub date -
Dec 13, 1996
filing date -
Jan 27, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a CDMA cellular telecommunications system, comprising mobile exchanges (MSC), base stations (BS) and mobile stations (MS), a new CDMA handoff procedure, a semi-hard handoff, is employed. Semi-hard handoff takes place within one and the same border base station (BS12), located in the boundary of two service areas (SA1, SA2) which are controlled by neighbouring mobile exchanges (MSC1, MSC2). This border base station is connected to and can be accessed from both of these neighbouring mobile exchanges. The inventive semi-hard handoff is a network based handoff of the communication control functions from the first to the second neighbouring mobile exchange without interrupting the active CDMA radio communications between the border base station (BS12) and the mobile station (MS).
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