Browse Prior Art Database

iDEN PACKET DATA DCAP FRAME OFFSET FOR OPTIMAL THROUGHPUT IN HALF-DUPLEX iDEN PACKET DATA SUBSCRIBER UNITS

IP.com Disclosure Number: IPCOM000008082D
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-16
Document File: 1 page(s) / 64K

Publishing Venue

Motorola

Related People

Doug Lenz: AUTHOR [+3]

Abstract

iDEN, integrated Digital Enhanced Network, is a wireless communication system that provides sev- eral services, such as telephone interconnect, dis- patch, short message, circuit data and packet data to the user. iDEN uses digital, time division multi- plexed (TDM) technology.

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Technical Developments

iDEN PACKET DATA DCAP FRAME OFFSET FOR OPTIMAL THROUGHPUT IN HALF-DUPLEX iDEN PACKET DATA SUBSCRIBER UNITS

by Karen A. Brailean, Doug Lenz and Steve Upp

  iDEN, integrated Digital Enhanced Network, is a wireless communication system that provides sev- eral services, such as telephone interconnect, dis- patch, short message, circuit data and packet data to the user. iDEN uses digital, time division multi- plexed (TDM) technology.

  DCAP, Dynamic Channel Allocation Protocol, is the protocol used over the air by the iDEN Packet Data network to keep the population of mobile sub- scribers apprised of the status and allocated band- width of the Packet Channel. DCAP periodically provides information on which TDM slots are used for packet data and which slots are not. DCAP also supports control messages sent from the fixed end to the MS, mobile subscriber, over the packet data channel, PCH.

  DCAP uses a time slot to send the information to the subscribers. One DCAP slot defines the pack- et data channel bandwidth allocation for all of the time slots in the next DCAP framer. The DCAP frame is comprised of a configurable multiple of twelve contiguous slots. In every DCAP frame there is one DCAP slot. The remaining slots in the frame are allocated for either packet switched or circuit switched traffic.

  Figure 1 shows a DCAP frame consisting of 24 slots. The DCAP slot is transmitted by the Fixed Network Equipment and must be read by every MS on th...