This paper presents a network layer model for a wireless multiple access system with both persistent and non-persistent users. There is a single access point with multiple identical channels. Each user who wants to send a file first scans a subset of the channels to find one that is idle. If at least one idle channel is found, the user transmits a file over that channel. If no idle channel is found, a persistent user will repeat the access attempt at a later time, while a non-persistent user will leave. This is a useful mathematical model for "coffee shop" situations where a group of persistent users stay near an access point for an extended period of time while non-persistent users come and go. Users have heterogeneous activity behavior, file upload rates, and service durations. The system is a complex multi-dimensional Markov chain. The steady state probabilities are found by exploiting a latent reversibility property. This enables simple expressions for throughput and blocking probability.

Reversible Models for Wireless Multi-Channel Multiple Access.

This paper presents a network layer model for a wireless multiple access system with both persistent and nonpersistent users. There is a single access point with multiple identical channels. Each user who wants to send a file first scans a subset of the channels to find one that is idle. If at least one idle channel is found, the user transmits a file over that channel. If no idle channel is found, a persistent user will repeat the access attempt at a later time, while a nonpersistent user will leave. This is a useful mathematical model for situations where a group of persistent users stay near an access point for an extended period of time while nonpersistent users come and go. Users have heterogeneous activity behavior, file upload rates, and service durations. The system is a complex multi-dimensional Markov chain. The steady state probabilities are found by exploiting a latent reversibility property and leveraging a discrete Fourier transform. This enables simple expressions for throughput and blocking probability.

Reversible Models for Wireless Multi-Channel Multiple Access

Time domain contention used in IEEE 802.11 has many overhead. To decrease the overhead, many frequency domain contention MAC protocols were proposed. However, to maximize the performance of system, the number of users who transmit data with a contention should increase. In this paper, we propose a subcarrier map broadcasting method. Access point (AP) broadcasts a subcarrier map including information about status of subcarriers. By broadcasting subcarrier map, more users can transmit data with a contention. We also propose the algorithm that changes the number of users who participate in a contention. The total throughput of the proposed MAC protocol with algorithm is not reduced while that without algorithm is reduced, as the number of users increases. We analyze total, uplink throughput of the proposed MAC protocol. We also compare throughput of the proposed MAC protocol between with and without algorithm. Mathematical analysis validate with simulation results. The proposed MAC protocol and algorithm improve throughput of system.

MAC Protocol Design of Frequency Domain Contention Using OF DM Subcarriers

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MAC Protocol Design of Frequency Domain Contention Using OF DM Subcarriers