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METHOD OF CONTROLLING THE TRANSMISSION OF TRAFFIC ON A PACKET DATA CHANNEL

IP.com Disclosure Number: IPCOM000007353D
Original Publication Date: 2002-Mar-18
Included in the Prior Art Database: 2002-Mar-18
Document File: 3 page(s) / 69K

Publishing Venue

Motorola

Related People

Michael P. McMahon: AUTHOR [+3]

Abstract

This paper describes the sequencer that was created to determine the transmission order of data payload and required Link Control (LC) messages on a packet data channel (PDCH) while keeping the channel constantly keyed and filled with information. The need to intertwine data payload and required LC messages on a PDCH is due to the fact a Subscriber Unit (SU) can remain on a PDCH for an extended period of time thereby missing desired voice activity occurring on other channels at the site. The system includes voice call activity in LC messages. Existing trunked systems utilize a Control Channel (CC) and Link Control (LC) Sequencer. Unfortunately, neither sequencer provides a priority mechanism to control the transmission of data payload and required LCs on an active channel. This invention defines the process used by a channel assigned to packet data service to process messages received from various devices and determine the transmission priority of those messages.

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METHOD OF CONTROLLING THE TRANSMISSION OF TRAFFIC ON A PACKET DATA CHANNEL

By Michael P. McMahon

Robert A. Biggs

Hemant Patel

This paper describes the sequencer that was created to determine the transmission order of data payload and required Link Control (LC) messages on a packet data channel (PDCH) while keeping the channel constantly keyed and filled with information. The need to intertwine data payload and required LC messages on a PDCH is due to the fact a Subscriber Unit (SU) can remain on a PDCH for an extended period of time thereby missing desired voice activity occurring on other channels at the site. The system includes voice call activity in LC messages.

Existing trunked systems utilize a Control Channel (CC) and Link Control (LC) Sequencer. Unfortunately, neither sequencer provides a priority mechanism to control the transmission of data payload and required LC’s on an active channel. This invention defines the process used by a channel assigned to packet data service to process messages received from various devices and determine the transmission priority of those messages.

Upon receiving a message, the PDCH sequencer will determine the transmission priority based on message type or specified priority. The message is then placed in a queue to await selection for transmission. Messages that require retransmission to better ensure reception by monitoring SU’s are lowered to a different queue upon transmission.

In order to guarantee voice grant updates are received in a timely manor on the PDCH, high priority Group Voice Channel Update (priority pre-determined) and Group Regroup Channel Update LC’s are placed in Queue 1 of the sequencer. In order to ensure that messages input into Queue 1 will not dominate the OB PDCH, they are lowered to Queue 4 for required repeat. Th...