Multichannel MAC Protocols for Wireless Networks

刘健

今天看到的，很好的一个MRMC中MAC层的协议，很不错，所以分享了。

Project Members
Faculty:

Samir R Das

Himanshu Gupta

Student:

Ritesh Maheshwari
Overview

    It is now well-known that multihop wireless networks are fraught with significant capacity problems. Due to the broadcast nature of wireless transmissions -- resulting in interference -- only one transmission can occur in a physical neighborhood. In recent years several diversity techniques have been used to get around this fundamental limitation. One such diversity technique now being widely studied is use of multiple frequency channels. Use of multiple frequency channels enables conflict free transmissions in a physical neighborhood so long as pairs of transmitters and receivers can tune to different nonconflicting channels (which current wireless protocols like IEEE 802.11 already provide).   
    In this project we propose new MAC protocols for wireless ad-hoc networks which utilize multiple channels to improve the capacity of the network. We have developed two new multichannel MAC protocols, xRDT (based on Reciever-directed transmission scheme discussed in [1]) where nodes can switch channels arbitrarily and LCM-MAC where nodes switch channels only after some local coordinations. Our ns2 simulation results show that these protocols significantly outperform single channel IEEE 802.11 and some past works in this field.
Please contact

if you require ns2 code of our work.
Publications

Ritesh Maheshwari, Himanshu Gupta and Samir R. Das,
Multichannel MAC Protocols for Wireless Networks
, In Proceedings of IEEE SECON 2006, Reston, VA, Sept 2006
Related Works
N. Shacham and P. King. "
Architectures and performance of multichannel multihop packet radio networks
."; IEEE Journal on Selected Areas of Communication, SAC-5(6):1013–1025, 1987.
J. So, N. Vaidya; ``
Multi-Channel MAC for Ad Hoc Networks: Handling Multi-Channel Hidden Terminals Using A Single Transceiver
''; Proc. ACM MobiHoc 2004
S.-L.Wu, C.-Y. Lin, Y.-C. Tseng, and J.-P. Sheu.  "
A new multichannel MAC protocol with on-demand channel assignment for multi-hop mobile ad hoc networks.
"; In Int’l Symp. on Parallel Architectures, Algorithms and Networks (I-SPAN), 2000.
V. Bahl, R. Chandra, J. Dunagan; ``
SSCH: Slotted Seeded Channel Hopping for Capacity Improvement in IEEE 802.11 Ad-Hoc Wireless Networks
'';Proc. ACM Mobicom 2004


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