Interference Adaptive Multiple Access in a Multi Access Port Radio System
Access algorithms have been studied extensively for systems consisting of one base station, shared by a number of terminals. Interference from terminals in other cells is generally neglected. These studies therefore suggest conventional cellular systems, where different cells are allocated different frequencies. In this paper we will study a system consisting of a number of access ports. All terminals may access any of these ports using a common radio channel. It has been shown that such multi access port systems can obtain much higher throughput compared to conventional cellular systems. We propose two access algorithms. One of the algorithms is based on the principle of the Idle Sense Multiple Access (ISMA) algorithm. The algorithm takes interference from other terminals in consideration and is therefore called Interference Adaptive Multiple Access (IAMA). In the second algorithm first a selection of terminals that can transmit simultaneously is made, after which the selected terminals may transmit their data packets. We name this algorithm Multi Port Auction Aloha (MPAA). We compare the performance of the two algorithms to that of Slotted Aloha. We will show that both algorithms have a much higher throughput than slotted Aloha. The throughput of IAMA is clearly best.
KeywordsTime Slot Wireless Local Area Network Transmission Probability Interference Power Access Port
Unable to display preview. Download preview PDF.
- Kim, H. J., Linnartz, J.P., “Virtual cellular network: a new wireless communications architecture with multiple access ports”, IEEE Vehicular Technology Conference, Stockholm, 1994.Google Scholar
- Rosberg, Z., Sidi, M., “TDM policies in multistation packet radio networks”, IEEE Transactions on Communications, vol. 37, no. 1, Jan. 1989.Google Scholar
- Roobol, C., “On the packet delay in wireless local area networks with access port diversity and power control”, IEEE Personal Indoor Mobile Radio Conference, Toronto, 1995.Google Scholar
- Roberts, L.G., “Aloha packet radio system with or without slots and capture”, Computer Communications Rev., vol. 5, Apr. 1975.Google Scholar
- Linnartz, J.R, “Effects of fading and interference in narrowband land-mobile networks”, Ph.D. thesis, Delft University of Technology, 1991.Google Scholar
- Amitay, N., “Distributed Switching and Control with Fast Resource Assignment /Handoff for Personal Communications Systems”, IEEE Journal on Selected Areas in Communications, Vol. 11, No. 6, August 1993.Google Scholar
- Leung, C, Lau, V, “Capture models for mobile packet radio networks”, IEEE Transactions on Communications, vol.40, no. 5, May 1992.Google Scholar
- Krishna, A., LaMaire, R.O., “A Comparison of Radio Capture Models and their Effect on Wireless LAN Protocols”, 3rd International Conference on Universal Personal Communications, 1994.Google Scholar
- Tobagi, F., Kleinrock, L., “Packet Switching in Radio Channels: Part II- The Hidden Terminal Problem in Carrier Sense Multiple Access and the Busy-Tone Solution, IEEE Transactions on Communications, Vol. Com-23, No. 12, Dec. 1975.Google Scholar