Performance analysis of slotted nonpersistent CSMA with an adaptive array and canceling signal

✍ Scribed by Tsugunao Kobayashi; Akira Sugihara; Kei Enomoto; Iwao Sasase

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 246 KB
• Volume: 81
• Category: Article
• ISSN: 8756-6621
• DOI: 10.1002/(sici)1520-6424(199810)81:10<60::aid-ecja7>3.0.co;2-t

✦ Synopsis

Slotted nonpersistent CSMA with an adaptive array is known to obtain high throughput when a number of terminals transmit data packets to a base station over a common radio channel. However, in this scheme, the terminals cannot begin to use a channel while the interfering packets are transmitted, even if the transmission of the acquired packet is complete. This causes throughput degradation. In this paper, we propose a slotted nonpersistent CSMA with an adaptive array and canceling signals to improve throughput performance. In the proposed model, the base station transmits a canceling signal to the terminals at the end of the transmission period of the acquired packet or at the time a failure occurs. The terminals cancel transmitting packets as soon as the terminals receive the canceling signal. We evaluate the throughput S and the average number of transmissions and schedulings G/S by theoretical analysis and computer simulation. It is shown that the proposed model attains higher S and smaller G/S than the conventional slotted nonpersistent CSMA with an adaptive array.