By Ping Wang, Weihua Zhuang
This short investigates disbursed medium entry regulate (MAC) with QoS provisioning for either unmarried- and multi-hop instant networks together with instant neighborhood zone networks (WLANs), instant advert hoc networks, and instant mesh networks.
For WLANs, an effective MAC scheme and a decision admission keep an eye on set of rules are awarded to supply assured QoS for voice site visitors and, whilst, raise the voice ability considerably in comparison with the present WLAN normal. moreover, a singular token-based scheduling scheme is proposed to supply nice flexibility and facility to the community merchant for carrier category management.
Also proposed is a unique busy-tone dependent dispensed MAC scheme for instant advert hoc networks and a collision-free MAC scheme for instant mesh networks, respectively, taking different community features under consideration. The proposed schemes improve the QoS provisioning potential to real-time site visitors and, while, considerably increase the procedure throughput and equity functionality for info site visitors, compared with the preferred IEEE 802.11 MAC scheme.
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Extra resources for Distributed Medium Access Control in Wireless Networks
Within each service interval, several voice packets may be generated and buffered by each voice station. In order to increase the efficiency, we combine the payload of these packets together and add a common MAC layer header instead of sending them one by one. It reduces the overall MAC layer header and physical preamble overhead. 4 Voice Capacity Analysis For a WLAN supporting voice/data traffic, we assign a higher priority to voice traffic. The CFP is used to transmit voice traffic; and in the CP, voice traffic has guaranteed priority over data traffic.
1 The Channel Time Occupancy Fraction of Voice Traffic Given Nv voice source nodes, the fraction of channel time used by voice traffic, denoted by ψ , can be derived as follows. The traffic from each voice node follows the on/off model, and the durations of the on and off states are exponentially distributed with mean values 1/α and 1/β , respectively. Hence, at any time instant, each voice node is at the on state with probability β /(α + β ). During each voice packet inter-arrival duration (denoted by Io ), each voice node which is at the on state generates one voice packet.
2 The Distributed Token-Based MAC Scheme 43 token) sends a JOIN-ACK message, including the updated network information, to the new data node. The new data node then calculates its πt (i) and Pitj accordingly. Similarly, when a data node leaves the WLAN, it also broadcasts a LEAVE message. When the current data token holder leaves the WLAN, it passes the token to another node before departure. All the data nodes update their information accordingly. To avoid the potential collision between the JOIN/JOIN-ACK/LEAVE message transmission and the voice/data packet transmission, we let the data node wait for the channel being idle for a short period T4 (< T3 ) before sending JOIN/JOINACK/LEAVE message.
Distributed Medium Access Control in Wireless Networks by Ping Wang, Weihua Zhuang