Performance Analysis of RLC/MAC and LLC Layers in a GPRS Protocol Stack

Premkumar, K and Chockalingam, A (2004) Performance Analysis of RLC/MAC and LLC Layers in a GPRS Protocol Stack. In: IEEE Transactions on Vehicular Technology, 53 (5). pp. 1531-1546.

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Abstract

Abstract—In this paper, we analyze the performance of various layers of the general packet radio service (GPRS)protocol stack,including radio link control/medium-access control (RLC/MAC) layer and logical link-control (LLC) layer on the uplink. In the GPRS MAC protocol, several time-slotted uplink radio-frequency channels are shared by the mobiles on a request-reservation-based multiple-access scheme. Using the theory of Markov chains, we derive expressions for the average throughput and delay performance of the GPRS MAC protocol. We evaluate the performance of the RLC layer (in acknowledged mode) using block-level retransmission (BLR), as defined in the current GPRS standard, and compare it with that of using slot-level retransmission (SLR). We show that SLR at the RLC layer performs significantly better than the BLR, particularly when the channel-error rates are moderate to high. We further investigate the choice of parameters (e.g., number of retransmission attempts) for the automatic repeat request schemes at the RLC and LLC layers. Our results show that it is more benefi-cial to do error recovery by allowing more retransmission attempts at the RLC layer than at the LLC layer. We also evaluate the performance of transmission-control protocol with BLR and SLR at the RLC layer.

Item Type:	Journal Article
Publication:	IEEE Transactions on Vehicular Technology
Publisher:	IEEE
Additional Information:	©2004 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	Automatic repeat request (ARQ);block-level retransmission (BLR);general packet radio service (GPRS);logical link control (LLC);radio link control/medium-access control RLC/MAC);slot-level retransmission (SLR);transmission-control protocol (TCP).
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	25 Aug 2008
Last Modified:	19 Sep 2010 04:17
URI:	http://eprints.iisc.ac.in/id/eprint/2306

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