The relevant performance metric for successful deployment of Radio Frequency Identification (RFID) systems for tag inventory applications is the latency for reading all tags with (high) reliability. Tag collisions in response to a reader query increase the read latency of the MAC protocol; the mean latency can be considerably improved by a combination of techniques including more efficient anti-collision approaches as well as via estimation of the number of backlogged tags. We propose a novel anti-collision algorithm: breadth-first-search with m-ary splitting (BMSA) within a TDMA frame structure. A simple backlogged tag estimation algorithm is used in conjunction with the above to dynamically set the splitting factor (SF) m. Simulation results demonstrate the superiority of the proposed scheme over existing methods in terms of throughput/latency.
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).
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