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Browse Prior Art Database

iDEN PACKET DATA RECONNECTION AND LAPi

IP.com Disclosure Number: IPCOM000008635D
Original Publication Date: 1998-Mar-01
Included in the Prior Art Database: 2002-Jun-28
Document File: 1 page(s) / 51K

Publishing Venue

Motorola

Related People

J. Christopher Stanaway: AUTHOR

Abstract

iDEN Packet Data has defined the Link Access Protocol-iDEN (LAPi) for reliable wireless data transmissions. Also, a MS can change cells during data tranimission or reception due to poor RF conditions. If the MS is in the middle of trans- mitting data to the system when it changes cells, LAPi requires the MS to wait until the system informs the MS what pieces of the data it did not receive from the MS before the MS can transmit the remaining data. This is inefficient as (I) the MS knows where it left off transmitting data to the system; (2) the acknowledgment is likely to be sent to the old cell and the MS will have to wait even longer to timeout and resend the entire PDU; and (3) retry PDUs are sent at a lower modulation rate to increase the likelihood of reception.

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MOTOROLA Technical Developnmrs

8

iDEN PACKET DATA RECONNECTION AND LAPi

by J. Christopher Stanaway

  iDEN Packet Data has defined the Link Access Protocol-iDEN (LAPi) for reliable wireless data transmissions. Also, a MS can change cells during data tranimission or reception due to poor RF conditions. If the MS is in the middle of trans- mitting data to the system when it changes cells, LAPi requires the MS to wait until the system informs the MS what pieces of the data it did not receive from the MS before the MS can transmit the remaining data. This is inefficient as (I) the MS knows where it left off transmitting data to the system; (2) the acknowledgment is likely to be sent to the old cell and the MS will have to wait even longer to timeout and resend the entire PDU; and
(3) retry PDUs are sent at a lower modulation rate to increase the likelihood of reception.

The proposed change in operation is as follows: when the MS changes cells during data transmission,

it would transmit the reminder of the PDU as a retry PDU in the new cell as soon as possible without waiting for the system to respond with an acknowl- edgment of the initial transmission. This solves both
(I) and (2) above. Since the MS reconnected, it has entered a cell that has better RF conditions than the old cell. The modulation rate does not need to be reduced and could even be increased. This solves
(3) above.

  Instead of being a slave to information from the system, the MS can take advantage of inf...