Carrier sense multiple access with message-based priority functions
Abstract
In multiaccess/broadcast systems, all users share a common transmission medium over which they broadcast their packets. The present investigation is concerned with the introduction of priority considerations regarding the transmission of messages. Attention is given to the p-persistent prioritized carrier sense multiple access (P-CSMA) procedure. The p-persistent P-CSMA protocol is discussed, taking into account aspects of carrier sense multiple access, a basic mechanism for priority assessment (a nonpreemptive discipline), and preemptive P-CSMA. An analysis is conducted of the nonpreemptive p-persistent P-CSMA, and numerical results concerning the performance of P-CSMA are discussed. A study is performed regarding the effect of various system parameters and of preemption on the performance. It is found that P-CSMA satisfies the requirements for prioritized access schemes.
- Publication:
-
NASA STI/Recon Technical Report A
- Pub Date:
- January 1982
- Bibcode:
- 1982STIA...8222006T
- Keywords:
-
- Carrier Waves;
- Channels (Data Transmission);
- Message Processing;
- Multiple Access;
- Packet Switching;
- Priorities;
- Radio Transmission;
- Broadcasting;
- Channel Capacity;
- Communication Networks;
- Computerized Simulation;
- Probability Theory;
- Time Lag;
- Transmission Efficiency;
- Communications and Radar