RSR-ARQ Mechanism for Unreliable Data Communication in GPRS

Abstract

In GPRS, severe jitter due to roughness (impairment) at the air interface between mobile station (MS) and base station (BS) produces adverse impact on the efficiency of the LLC (logical link control) and TCP (transmission control protocol) layers. Natural conditions at the air interface make communication reliability more vulnerable. Here, reliability refers to efficient recovery of the lost or erroneous data. On the other hand, delays in the recovery of the data at the air interface not only decreases the efficiency of the LLC and TCP layers but also increases the chances of buffer overflows. The proposed mechanism is enhancement of the RSR-ARQ protocol that ensures better efficiency and reliability of data. The RSR-ARQ supports channel impairment and buffer sensitive mechanism without affecting the reliability of the feedback communication. The system uses two state discrete time Markov channel (DTMC). The simulation results demonstrate the better recovery of the data and better efficiency for the LLC and TCP layers with minimum chances of buffer overflow.