Topology-Selective Jamming of Certain CDMA (Code-Division Multiple-Access) Monohop Networks

摘要

The throughput/delay performance of Code-Division Multiple-Access (CDMA) spread-spectrum networks has received wide attention in the past decade, particularly because of the military interest in mobile packet radio. Accordingly, the survivability of a Packet Radio (PR) network under jamming attack is an important issue. Conceptually, a network could be attacked on three layers of importance, namely the network, link, and physical layers. In such a jamming game, many factors could affect the results. The communicators have the choices of routing algorithms, channel quality monitoring schemes, and the network information exchange schemes. On the other hand, jammer choices include temporal features (such as static, dynamic or follower jamming) as well as topological features (i.e., selection of nodes or links to be jammed). The purpose of the present paper is to introduce certain concepts on topology-selective jamming and further examine its impact on a certain class of 'local' or 'monohop' networks, which we specify below. This particular class of networks has been selected because there exists a convenient analytic vehicle which adequately describes their performance; thus, it provides a reasonable starting model upon which topological jamming can be defined and assessed with a good degree of analytic ease. We note, however, that the following definitions of topological selectivity are quite general and can be applied to other models as well. We also note that topological selectivity can be perceived as a complementary notion to temporal selectivity, which pertains to jamming patterns with different time-domain profiles but homogeneous with regard to space; the reader is referred to for a discussion of the latter use.