Popularity Aware Scheduling for Network Coding based Content Distribution in Ad Hoc Networks

2014 IEEE International Conference on Communications (ICC)

Granelli

Paramanathan

et al. 2014

An important challenge for the implementation of network coding in IEEE 802.11-based wireless networks is to give additional priority for channel access to the relay stations responsible for coding. These relay stations are able to provide more information in a single transmission than those that forward single packets, hence improving throughput and energy efficiency. The Distributed Coordination Function (DCF) of the IEEE 802.11 standard is a contention-based Medium Access Control (MAC) protocol that provides an equal distribution of channel access opportunities for all competing stations. However, the relay station represents a congestion point and additional transmission slots should be assigned to it to increase the overall network performance. To address this issue we investigate a coding-aware MAC protocol, called Reverse Direction DCF (RD-DCF), which enables bidirectional communications between the relay station and another station with a single channel access invocation. This simple and backwards compatible mechanism allows the relay station to transmit a coded packet together with the acknowledgement immediately after receiving a data packet. The simulation results show a gain of up to 130% in terms of both throughput and energy efficiency for RD-DCF with network coding when compared to DCF.

Section: B Existing Coding-aware Mac-layer Priority Schemesmentioning

confidence: 99%

“…In the literature prior work [4]- [7] has focused on adjusting the size of the contention window based on the level of congestion, the state of channel contention, and network coding information to assign different channel access priorities. These approaches assume a contention-based operation of stations as defined in the legacy 802.11 DCF.…”

mentioning

confidence: 99%

Coding-aware MAC: Providing channel access priority for network coding with reverse direction DCF in IEEE 802.11-based wireless networks

2014 IEEE International Conference on Communications (ICC)

Granelli

Paramanathan

et al. 2014

“…Therefore, providing additional transmission priority for the relay node is essential to fully exploit the advantages of NC. Previous works [4]- [7] propose to adjust the size of the contention window based on the level of congestion, the state of channel contention, and NC information, so that several priorities can be assigned to different nodes. These approaches assume that relay nodes ready to transmit a coded packet will compete for the channel access as if they were regular nodes.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a network coding-aware MAC protocol for IEEE 802.11 wireless networks with Reverse Direction transmissions

2014 IEEE Global Communications Conference

Haile

Alonso-Zárate

et al. 2014

The implementation of Network Coding (NC) in IEEE 802.11-based wireless networks presents the important challenge of providing additional transmission priority for the relay nodes responsible for coding. These nodes are able to convey more information in each transmission than those that forward single packets, by combining several received packets in a single coded packet. To transmit data, the nodes execute the IEEE 802.11 Medium Access Control (MAC) protocol, called the Distributed Coordination Function (DCF). Thus, they compete for the access to the wireless channel and get equal transmission opportunities under high congestion. As a result, congested relay nodes will severely limit the performance of the network. In this paper, we investigate a backwards-compatible mechanism, called Reverse Direction DCF (RD-DCF), that allows relay nodes to transmit data upon successful reception of data. We analyze the performance limits of the proposed protocol with and without NC in terms of throughput and energy efficiency. The performance evaluation considers different traffic loads, packet lengths, and data rates. The results of this work show that the proposed RD-DCF+NC protocol can improve throughput and energy efficiency up to 335% when compared to legacy DCF.

“…For this, previous works [4]- [7] proposed to adjust the size of the Contention Window (CW) based on the level of traffic congestion, the state of channel contention, and NC information. However, in these works, the relay nodes are still affected by the serious competition of all nodes for channel access, since the access priority is higher on average, i.e., probabilistic.…”

Section: Introductionmentioning

confidence: 99%

Reverse direction transmissions and network coding for energy-efficient Wi-Fi networks

2014 IEEE 19th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD)

Kliazovich

Granelli

2014

Abstract-This paper proposes a combination of the Reverse Direction Protocol (RDP) defined in the IEEE 802.11n and the Network Coding (NC) technique to improve the energy efficiency of wireless networks based on the IEEE 802.11. The aim of the combined approach, named BidCode, is to allow intermediate nodes to combine several received packets into coded packets and immediately forward them upon successful reception of data. The energy efficiency of BidCode is analyzed in this paper and compared to those of the Distributed Coordination Function (DCF) and an important NC protocol based on IEEE 802.11, called COPE. Both analytical and simulation results show the high energy efficiency of BidCode with gains of up to 350% and 130% when compared to DCF and COPE, respectively. *