Interference management using basestation coordination in broadband wireless access networks

Abstract

This paper proposes a transmission-scheduling algorithm for interference management in broadband wireless access networks. The algorithm aims to minimize the cochannel interference using basestation coordination while still maintaining the other quality of service (QoS) requirements such as packet delay, throughput and packet loss. The interference reduction is achieved by avoiding (or minimizing) concurrent transmission of potential dominant interferers. Dynamic slot allocation based on traffic information in other cells/sectors is employed. In order to implement the algorithm in a distributed manner, basestations (BSs) have to exchange traffic information. Both real-time and non-real-time services are considered in this work. Results show that significant reduction in the packet error rate can be achieved without increasing the packet delay at low to medium loading values and with a higher but acceptable packet delay at high loading values. Since ARQ schemes can also be used for packet error rate reduction, we compare the performance of the proposed scheme with that of ARQ. Results indicate that although ARQ is more effective in reducing packet error rate, the proposed algorithm incurs much less packet delay particularly at medium to high loading.

A weighted interference estimation scheme for interface‐switching wireless mesh networks

“…The former estimates the set of interference nodes/ links for a given node/link, whereas the latter estimates the interference level of a link on another one. The problem of co-channel interference estimation has been long studied, and a number of papers [4,5,12,14,15,[17][18][19][20][21] have been printed.…”

Radio resource management in cellular multihop networks

“…In Reference [8], scheduling of time slots in neighboring cells (which lead to high interference) is avoided and investigated in combination with sector antennas. The assumption is that most of the terminals will have only small mutual interference, while there are only few where interference conditions are bad, for example at the cell border.…”

Handover of relay stations for load balancing in IEEE 802.16

“…Thus, the RSs positioned in the overlapping areas will transmit only when the other stations (RSs or MSs) in close vicinity are inactive. In other words, the transmissions of problematic stations are scheduled in different time or/and different frequency to avoid interference (see e.g., References [6,7]). The second strategy, which could complement the first one for higher interference mitigation, is to use adaptive antenna techniques (see e.g., References [8]).…”