Methods of increasing two-way transmission capacity of wireless ad hoc networks

Kan Yu,Guangshun Li,Lina Ni,Jiguo Yu

doi:10.1186/s13638-018-1304-1

Abstract

Two-way communication is required to support control functions like packet acknowledgement and channel feedback. Most previous works on the transmission capacity of wireless ad hoc networks, however, focused on one-way communication; reverse communication from the destination to the source was ignored. In this paper, we first establish mathematical expression for two-way transmission capacity under the fixing transmission distance (i.e., the distance between the source and the destination is a constant), by introducing the concept of two-way outage and setting different rate requirements in both directions. Next, based on the concept of guard zone and cooperative communication, methods of increasing two-way transmission capacity are proposed. Simulation results show that the proposed methods can improve two-way transmission capacity significantly.

Highlights

More and more attentions have focused on Internet of Things (IoT) applications
Two-way transmission capacity of a wireless ad hoc network refers to the maximum number of successful transmissions existing per unit network area, constrained by two-way outage probability
To increase two-way transmission capacity, we introduce the concept of guard zone, which can be modeled as a disc of radius φ centered at the receiving node; interfering transmissions cannot be allowed to exist within this disc

Summary

Introduction

More and more attentions have focused on Internet of Things (IoT) applications. In the landmark work [12], Truong et al developed the concept of transmission capacity of two-way communication in wireless ad hoc networks with the concept of a two-way outage They derived an upper bound and an approximation for two-way transmission capacity, which are shown to be relatively tight for small outage probability constraints. They concluded that the two-way capacity loss is considerable by numerical and simulation results. The main contributions of this paper can be summarized as follows: Considering correlation of interference in both directions and using tools of stochastic geometry, we derive lower and upper bounds for outage probability and transmission capacity of two-way.

Methods

Network model

Two-way transmission capacity with cooperative communication and guard zone

Results

Conclusion