Browse Prior Art Database

DATA CHANNEL ALLOCATION METHOD FOR TRANSACTION-BASED MOBILE DATA

IP.com Disclosure Number: IPCOM000008633D
Original Publication Date: 1998-Mar-01
Included in the Prior Art Database: 2002-Jun-28
Document File: 1 page(s) / 66K

Publishing Venue

Motorola

Related People

Michael Stepien: AUTHOR [+2]

Abstract

iDEN is a TDMA radio system, i.e. each iDEN carrier is divided into timeslots. Channelized communications such as voice and circuit data and handled by assigning a periodic series of slots (a "logical channel") to a particular subscriber for the duration of the subscriber's call.

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MOTOROLA Technical Developments

8

DATA CHANNEL ALLOCATION METHOD FOR TRANSACTION-BASED MOBILE DATA

by Michael Stepien and Tim Wilson

  iDEN is a TDMA radio system, i.e. each iDEN carrier is divided into timeslots. Channelized communications such as voice and circuit data and handled by assigning a periodic series of slots (a "logical channel") to a particular subscriber for the duration of the subscriber's call.

  iDEN will soon add a packet data service in which bandwidth is dynamically allocated for packet radio traffic. The allocation function is performed by a protocol called Dynamic Channel Allocation Protocol (DCAP). In the initial packet data offering, DCAP will give absolute priority to voice calls- essentially, only timeslots on the carrier that are not channelized for voice calls can be used for packet data traffic. Thus the amount of bandwidth available for packet data will vary statistically, and at peaks of voice load, the packet data bandwidth could shrink to zero for intervals of time (the packet channel can "close out").

  Simulations have shown that there are many existing data applications that do not perfon well in this kind of environment. These applications are particularly sensitive to the periods when the packet channel is closed out and the available channel throughput is zero. It turns out that applica- tions expect to be able to continue communicating once they have begun communicating.

  Thus there exists a need for an inproved DCAP algorithm w...