TY - GEN
T1 - SoftMAC
T2 - 2005 Second Annual IEEE Communications Society Conference on Sensor and AdHoc Communications and Networks, SECON 2005
AU - Wu, Haitao
AU - Wang, Xin
AU - Liu, Yunxin
AU - Zhang, Qian
AU - Zhang, Zhi Li
PY - 2005
Y1 - 2005
N2 - In this paper, we present the challenges in supporting VoIP services over multi-hop wireless networks using commercial IEEE 802.11 MAC DCF hardware, and propose a novel software solution, called Layer 2.5 SoftMAC. Our proposed SoftMAC resides between the 802.11 MAC layer and IP layer to coordinate the real-time and best-effort packet transmission among neighboring nodes in a multi-hop wireless network. To effectively support VoIP services, our SoftMAC architecture employs three key mechanisms: 1) distributed admission control for regulating the load of real time-traffic, 2) rate control for minimizing the impact of best-effort traffic on real-time traffic, and 3) non-preemptive priority queueing for providing high priority service to VoIP traffic. To evaluate the efficacy of these mechanisms, we conduct extensive simulations using the network simulator NS2. We also implement our proposed SoftMAC as a Windows Network Driver Interface Specification (NDIS) driver over Network Interface Card (NIC) driver, and build a multi-hop wireless network testbed with 32 wireless nodes equipped with 802.11 a/b/g combo cards. Our evaluation and testing results demonstrate the effectiveness of our proposed software solution.
AB - In this paper, we present the challenges in supporting VoIP services over multi-hop wireless networks using commercial IEEE 802.11 MAC DCF hardware, and propose a novel software solution, called Layer 2.5 SoftMAC. Our proposed SoftMAC resides between the 802.11 MAC layer and IP layer to coordinate the real-time and best-effort packet transmission among neighboring nodes in a multi-hop wireless network. To effectively support VoIP services, our SoftMAC architecture employs three key mechanisms: 1) distributed admission control for regulating the load of real time-traffic, 2) rate control for minimizing the impact of best-effort traffic on real-time traffic, and 3) non-preemptive priority queueing for providing high priority service to VoIP traffic. To evaluate the efficacy of these mechanisms, we conduct extensive simulations using the network simulator NS2. We also implement our proposed SoftMAC as a Windows Network Driver Interface Specification (NDIS) driver over Network Interface Card (NIC) driver, and build a multi-hop wireless network testbed with 32 wireless nodes equipped with 802.11 a/b/g combo cards. Our evaluation and testing results demonstrate the effectiveness of our proposed software solution.
UR - http://www.scopus.com/inward/record.url?scp=33744523098&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33744523098&partnerID=8YFLogxK
U2 - 10.1109/SAHCN.2005.1557097
DO - 10.1109/SAHCN.2005.1557097
M3 - Conference contribution
AN - SCOPUS:33744523098
SN - 0780390113
SN - 9780780390119
T3 - 2005 Second Annual IEEE Communications Society Conference on Sensor and AdHoc Communications and Networks, SECON 2005
SP - 441
EP - 451
BT - 2005 Second Annual IEEE Communications Society Conference on Sensor and AdHoc Communications and Networks, SECON 2005
Y2 - 26 September 2005 through 29 September 2005
ER -