Browse Prior Art Database

DYNAMIC ADAPTIVE LAYER 2 TIMER ADJUSTMENT

IP.com Disclosure Number: IPCOM000007966D
Original Publication Date: 1997-Mar-01
Included in the Prior Art Database: 2002-May-09
Document File: 2 page(s) / 70K

Publishing Venue

Motorola

Related People

Rod Averbuch: AUTHOR [+3]

Abstract

In every ARQ protocol a timer is set after the transmission of data frame in order to detect frame loss. Normally this timer is set to the maximum round trip delay plus maximum peer frame process- ing time.

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MOTOROLA Technical Developments

DYNAMIC ADAPTIVE LAYER 2 TIMER ADJUSTMENT

by Rod Averbuch, Karen Brailean and Jeff Blanchette

PRIOR ART

  In every ARQ protocol a timer is set after the transmission of data frame in order to detect frame loss. Normally this timer is set to the maximum round trip delay plus maximum peer frame process- ing time.

  In land networks a constant timer value is used. The timer value could be a negotiable parameter yet, it does not adaptivley change frame by frame basis for these reasons:

1, The round trip delay plus peer frame process ing time is relatively constant.
2. The transmission medium is not considered as high premium.
3. The transmission line throughput capability is not so critical.

WHAT IS THE PROBLEM?

In radio packet data networks (CDPD, iDEN, GPRS - GSM) these assumptions are false because:

1. The trip delay depends on the dynamic packet channel size.
2. The air is a premium medium.
3. The throughput per Hz is very important.

For these reasons, setting the frame guard timer to the optimum value is very important.

WHAT IS THE INVENTION BEING DISCLOSED AND HOW DOES THIS INVENTION RESOLVE THE PROBLEM?

  This invention discloses a solution that will pro- vide an optimum adaptive timer adjustment; yet, it will relieve the cell from real time message loading during high rate packet traffic.

B Morom$, 1°C. 1997 21 March 1997

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M-LA Technical Developments

Layer 2 land e...