Method and apparatus for performing handoff in a packet data communication system
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United States of America Patent
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Jun 25, 1996
Grant Date -
N/A
app pub date -
Jun 6, 1995
filing date -
Jun 6, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
A packet data communication system (100) that includes a packet data routing network (101, 103) and a plurality of base sites (105-107) employs a method (400, 500) and apparatus for providing packet data to a communication unit (109). The packet data routing network (101, 103) provides a packet (201-208) of data to at least two of the base sites (105-107), one of the base sites (e.g., 105) being the site currently serving the communication unit (109) and the other base site or sites (e.g., 106, 107) being possible handoff targets. The serving base site (105) transmits at least a first portion (e.g., 201-203) of the packet (201-208) to the communication unit (109) and the communication unit (109) receives the transmitted packet or portion thereof. However, if during transmission of the packet (201-208) the communication unit (109) requires a handoff to one (e.g., 106) of the target base sites (106, 107), the communication unit (109) transmits an acknowledgment message (124) to the target base site (106) indicating receipt of the first portion (201-203) of the packet. Upon receipt of the acknowledgment message (124), the target base site (106) transmits at least a second portion (e.g., 204-208) of the packet to the communication unit (109).
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