Showing papers on "Handover published in 1983"

Telephone office service assist and handoff

Abstract: A method of controlling a telephone office serving a call to obtain a call processing capability not available at the office. A data base executes a customer program unique to a customer in response to each call to the customer. The customer program determines from call parameters how to process a particular call and instructs the serving office to perform specific primitive call processing capabilities to process the call. If the serving office is unable to perform a capability required to process the call in accordance with the customed program, the date base selects a second office which should be able to perform the capability. The call is routed from the first office to the second office under control of the data base and the second office performs one or more call processing capabilities under control of the data base. Call processing may be returned to the first office under control of the data base after a capability is performed at the second office. This is referred to as a service assist. On the other hand, call processing may be turned over completely to the second office, in which case it is referred to as a service handoff.

Handoff Assigned Multiple Access (HAMA): A New Multiple Access Protocol for Computer Communication Networks

Abstract: The Handoff Assigned Multiple Access (HAMA) protocol has been designed to meet the performane requirements of the Tactical Intra-task Force Network, a hypothetical mobile Navy broadcast radio network. This packet switched network will facilitate the transmission and reception of target track data and various command and control messages between Navy platforms (ships) in a dynamic, tactical environment. The unique characteristics and requirement of the TACNET resulted in the development of the HAMA multiple access protocol. The protocol is based on Time Division Multiple Access, in which the communication channel is divided into time frames, which are further subdivided into time slots. Each network node (ship) is assigned a particular slot, with exactly one slot for each node. With HAMA each node is allowed to handoff its slot to other network nodes. Thus, a node which has no use for its slot can dynamically hand it off to another node which does need it. Analysis of the protocol, both analytical and by simulation, indicates it performs remarkably well, much better than Time Division Multiple Access (TDMA) even at very high throughputs. Of particular importance to military networks, the analysis results indicate the protocol is very robust, and performs well under a variety of tactical conditions.