Throughput improvement of CDMA slotted ALOHA system by modified channel load sensing protocol

Author

Saito, M. ; Okada, H. ; Sato, T. ; Yamazato, T. ; Katasyama, M. ; Ogawa, A.

Author_Institution

Dept. of Inf. Eng., Nagoya Univ., Japan

Volume

1

fYear

1996

fDate

15-18 Oct 1996

Firstpage

103

Abstract

In this paper, we present the throughput performance of CDMA slotted ALOHA systems with modified channel load sensing protocol (MCLSP). In MCLSP, a hub station continuously senses channel load for a certain number of slots, and computes the probability with which each user station should transmit its packet, then broadcasts the computed value. As the access control is based on this probability, we can apply it to slotted system. We show that MCLSP can achieve significant improvement in throughput performance of CDMA slotted ALOHA systems even in large offered load. One of the issues in such a protocol is the access timing delay, which is the sum of process time and propagation time for the packet access control. We also show the effect of the access timing delay on the throughput performance

Keywords

access protocols; channel capacity; code division multiple access; packet radio networks; probability; spread spectrum communication; CDMA; access timing delay; modified channel load sensing protocol; packet access control; probability; quasi-synchronous sequences; slotted ALOHA system; throughput performance; Access control; Access protocols; Broadcasting; Delay effects; Electronic mail; Multiaccess communication; Propagation delay; System performance; Throughput; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 1996. PIMRC'96., Seventh IEEE International Symposium on

Conference_Location

Taipei

Print_ISBN

0-7803-3692-5

Type

conf

DOI

10.1109/PIMRC.1996.567525

Filename

567525