An energy-efficient MAC protocol for infrastructure WLAN based on modified PCF/DCF access schemes using a bidirectional data packet exchange

2013 IEEE 18th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD)

Kliazovich

et al. 2013

Self Cite

Abstract-The Distributed Coordination Function (DCF) is the fundamental access method defined in the IEEE 802.11 Standard for Wireless Local Area Networks (WLANs). With this standard, the Access Point (AP) and the mobile stations consume a significant amount of energy to contend for access to the shared wireless channel. In order to improve the energy efficiency of WLANs, we investigate in this paper a simple and backwards compatible mechanism, called Bi-Directional DCF (BD-DCF), that enables bidirectional communications between wireless stations with a single channel access invocation. The key idea is to let the AP or any mobile station transmit a data packet together with the acknowledgement upon the successful reception of a data packet. This approach reduces the communication overhead, the channel contention, and better balances uplink and downlink transmission opportunities. We evaluate the performance of the proposed BD-DCF by means of computer-based simulation considering different traffic loads, degrees of traffic symmetry, data packet sizes, and data rates. The results presented in this paper show that the BD-DCF protocol can improve the energy efficiency of DCF up to 50%.

Section: Ieee 18th International Workhop On Computer Aided Modeling mentioning

confidence: 99%

Section: Ieee 18th International Workhop On Computer Aided Modeling mentioning

confidence: 99%

Energy efficiency of an enhanced DCF access method using bidirectional communications for infrastructure-based IEEE 802.11 WLANs

2013 IEEE 18th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD)

Kliazovich

et al. 2013

Self Cite

“…In our previous work [8], MAC enhancements for PCF were proposed to a) reduce the overhead associated to the polling process and b) solve the problem of unpredictable medium occupancy of polled stations. In particular, MAC modifications were introduced to allow mobile stations to acknowledge any received data packet with a data packet equal to the received packet in size.…”

Section: Related Work and Motivationsmentioning

confidence: 99%

“…While asleep, most of the hardware components of the WLAN interface are turned off, hence significantly reducing energy consumption. The proposed approach is based on our previous findings presented in [8].…”

Section: Introductionmentioning

confidence: 99%

An energy-efficient point coordination function using bidirectional transmissions of fixed duration for infrastructure IEEE 802.11 WLANs

2013 IEEE International Conference on Communications (ICC)

Gajic³

et al. 2013

Self Cite

Abstract-The Point Coordination Function (PCF) of the IEEE 802.11 standard represents a well-known Medium Access Control (MAC) protocol providing Quality-of Service guarantees in Wireless Local Area Networks (WLANs). However, with the currently employed polling mechanism WLANs consume a significant amount of the energy resources from batterypowered user devices. To provide energy saving, an improved MAC protocol is presented in this paper, where bidirectional transmissions of fixed duration are incorporated into PCF in order to enable dynamic scheduling of real-time traffic. Based on this new strategy, wireless access points (APs) can estimate the proper duration of the Contention Free Period (CFP), in order to allow mobile stations to acknowledge any received data packet with a data packet equal to the received packet in size. Having this information, a mobile station, following the data exchange with the AP, can determine its wake-up timer and activate the sleep mode for the rest of the CFP interval. Comprehensive computerbased simulations demonstrate the feasibility of the proposed MAC improvements to achieve energy efficiency with negligible impact on packet delivery delay.

“…BidCode is an extension of our previously proposed Bidirectional MAC (BidMAC) [9], [10] inspired by the already standardized Reverse Direction Protocol (RDP). In both BidMAC and RDP, the receiving node of a data packet can respond with a data packet, instead of just sending an explicit acknowledgment (ACK).…”

Section: Introductionmentioning

confidence: 99%

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

Kliazovich

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

2014

Self Cite

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. *