Abstract
The fast increase of users in existing mobile networks requires more base stations (BSs) to bear more communication traffic. Future heterogeneous network is considered to be a promising candidate architecture to meet the demands of wireless networks under scarcity of radio frequency (RF) resources. In this paper, we present a multi-mode relay (MMR) model based on two-way relay technology, which is applied to heterogeneous hierarchical wireless networks (HHWN), and set up a system model of HHWN with 3 tiers, 2 users between the macrocell, and the picocell as the multi-mode relay (MMR). Specifically, we consider the new system with unequal relay emission power situation, which is usually researched in the traditional literature with equal relay emission powers. Based on this idea, we define the two-way SINR ratio, derive the mathematical formulas of outage error probability with channel estimation errors, and verify theoretical expressions by data simulations. For further comparison, several experiments are implemented to illuminate the effect on outage probability among different levels of relay emission power, noise power, and signal power. Furthermore, several conclusions are obtained, which have some meanings for implementing MMR in future heterogeneous networks.
Highlights
With the fast growth of mobile terminals, traffic of mobile data communication is growing extremely fast, which is becoming one of the challenges of network capacity and transport rate of community networks
It is assume that we have perfect channel estimation, the resulting self-interference in Equations (6) and (7) can be eliminated ; the received signals at sources A and B can be rewritten in Equations (8) and (9)
Because of the SINR f is related to multi-mode relay (MMR) power pr i (i = 1, 2), and the two pr are independent to each other, so Formula (14) can be rewritten as Equation (15)
Summary
With the fast growth of mobile terminals, traffic of mobile data communication is growing extremely fast, which is becoming one of the challenges of network capacity and transport rate of community networks. Heterogeneous hierarchical wireless networks (HHWN) introduces a lot of low-power base stations, such as picocells, femtocells, and distributed antenna systems (remote radio heads, such as relays). These heterogeneous elements can increase the flexibility of the network, and fulfill huge user requirements for random complex data traffic, and raise its quality of service.
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