Optimal Transmission Ranges for Randomly Distributed Packet Radio Terminals

Abstract

In multihop packet radio networks with randomly distributed terminals, the optimal transmission radii to maximize the expected progress of packets in desired directions are determined with a variety of transmission protocols and network configurations. It is shown that the FM capture phenomenon with slotted ALOHA greatly improves the expected progress over the system without capture due to the more limited area of possibly interfering terminals around the receiver. The (mini)slotted nonpersistent carrier-sense-multiple-access (CSMA) only slightly outperforms ALOHA, unlike the single-hop case (where a large improvement is available), because of a large area of "hidden" terminals and the long vulnerable period generated by them. As an example of an inhomogeneous terminal distribution, the effect of a gap in an otherwise randomly distributed terminal population on the expected progress of packets crossing the gap is considered. In this case, the disadvantage of using a large transmission radius is demonstrated.

Data Capacity Improvement of Wireless Sensor Networks Using Non-Uniform Sensor Distribution

“…The concept of progress is mainly used in geographical routing strategies [14,15,22,24]. Let d(PQ) denote the distance from P (sensor) to Q (sink) in Fig.…”

A unified interference/collision model for optimal MAC transmission power in ad hoc networks

“…The total energy is the product of the power consumed and the time spent in transmissions and collisions. Power Consumption: Due to the free space power loss, as indicated by Equation (1), the transmission power for data messages, P data , is: (27) where C is a constant that depends on the wireless network interface card and γ is the path loss factor.…”

“…At large a data the number of hidden terminals from the sender increases and the energy wasted during CTS collision dominates the network energy consumption. Additionally, the message reaches its destination with fewer hops, but the energy per hop is high due to the r γ factor in Equation (27).…”

Performance evaluation of a multilevel hierarchical location management protocol for ad hoc networks

“…Packet lifetime in the buffer is 4 seconds, and is subsequently dropped if a location query sent out fails to return the location of the destination within this time. MFR [25] without backward progression, in which packets are dropped if no forward progress can be made, was implemented as the geographic routing algorithm.…”