Throughput Analysis of ETSI BRAN HIPERLAN/2 MAC Protocol Taking Guard Timing Spaces into Consideration

Abstract

Abstract. In this paper we examine the effects of the required portions of guard timing spaces in a MAC frame of ETSI BRAN HIPERLAN/2 system such as inter-mobile guard timing space in UL(Up Link) duration, inter-RCH(Random CHannel) guard timing space, sector switch guard timing space. In particular, we calculate the number of OFDM(Orthogonal Frequency Division Multiplexing) symbols required for these guard timing spaces in a MAC frame. We then evaluate the throughput of HIPERLAN/2 system as we vary parameter such as the guard time values defined in [2], the number of DLCCs(Data Link Control Connections), and the number of RCHs. Finally we show by numerical results that the portions for the total summation of required guard timing spaces in a MAC frame are not negligible, and that they should be properly considered when trying to evaluate the performance of MAC protocol of HIPERLAN/2 system and also when determining the number of RCHs as well as the number of DLCCs in UL PDU trains at an AP/CC(Access Point/Central Controller).

On the MAC protocols for Radio over Fiber indoor networks

“…Based on the analysis presented in [7], the effect of the additional propagation delay on the throughput of a Hiper-LAN/2 network employing RoF is quantified in this section. The length of the LCHs (Long CHannels) that carry the actual data packets is first calculated.…”

“…To plot the effects of increasing guard time spaces accounting for the extra propagation delays (Pg), we assume that there are 10 active Mobile Terminals and 10 RCH slots in a cell. Throughput 3For the detailed discussion, we refer to [7]. is calculated in two cases, i.e.…”

“…This is because of the increase in overhead traffic (LPRE±SOH [7]) when the number of 1-4244-0569-6/06/$20.00 ©2006 IEEE MSs increases. It is also interesting to see that the effect of additional propagation delay is more noticeable in this case as the total length of the guard time spacing in a frame (LGTS [7]) directly depends on the number of direct link (NDiL) and the number of uplink connections (NUL). Although HiperLAN/2 is a centralized control protocol, MSs still have to use the Random Access (RA) phase to transmit Resource Request (RR) messages to the RG [8].…”