Method and apparatus for performing handoff in a packet data communication system
Patent 5530693 Issued on June 25, 1996. Estimated Expiration Date: 
June 6, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 6, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPacket data communication system Mobile communications system Data communication protocol Method and apparatus for establishing dispatch audio communication in a communication system Method of exchanging communicated signals between a remote base site and a central site in a communication system Signal communication method and apparatus Patent #: 5471471 InventorsApplicationNo. 465807 filed on 06/06/1995US Classes:370/331, Hand-off control370/349, Using messages having an address field as header455/437Mobile assisted or initiatedExaminersPrimary: Marcelo, MelvinAssistant: Carman, Melissa Kay Attorney, Agent or FirmInternational ClassH04L 012/56AbstractA 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). | |
