In this paper, we analyze the performance of the RLC (radio link control) layer in acknowledged mode (AM) in UMTS. In a third generation wireless network like UMTS, the RLC-AM protocol is used to transfer data reliably across the radio access network. With an automatic repeat request (ARQ) mechanism, this protocol is able to provide error correction and in-sequence delivery of IP packets. First, we analytically study the behavior of this link layer when reordering is disabled. Then, we present a simple simulation model for in-sequence delivery, easy to implement and able to capture the main characteristics of the RLC protocol. Theoretical and simulation results are compared in order to prove that a very simple simulation model can behave almost exactly like the RLC layer in UMTS.
"In order to save simulation time, system level simulations are used where the lower layers are represented via a fixed parameter  , measured or simulated traces, statistics(lookup tables) or stochastic models. Statistics or stochastic models up to now have been derived from link level simulations  . "
[Show abstract][Hide abstract] ABSTRACT: To provide a reliable transmission in 3GPP WCDMA systems, in the Radio Link Control (RLC) sublayer of the WCDMA, an Acknowledgement Mode (AM) is defined where an ACK frame is sent to indicate the data frame receiving status. In order to design a well-performed AM scheme, in this paper, we first investigate the AM protocol behavior and present the delay performance of the standard periodical AM-RLC scheme in the Bernoulli channel. Then, based on the observation from the performance above, we propose a dynamic AM scheme in RLC over a more general time-varying Markov channel. It is demonstrated that a much better delay performance can be achieved compared with the standard AM scheme with periodical acknowledgements.
Communications, 2006. ICC '06. IEEE International Conference on; 07/2006
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