Information Technology Reference
In-Depth Information
6Con lu on
The channel usage based dynamic multichannel assignment method introduced
in this paper has few impacts on the network connectivity, but it requires the
network nodes to equip
2
+ 1 for networks with
C
channels. This connec-
tivity invariant property can preserve the layered network protocol architecture
and ease the multichannel assignment, which leads to a good network perfor-
mance with low development and deployment costs. Consider the small number
of channels and the obvious benefits of connectivity invariance, this hardware
requirement is acceptable. By monitoring the active transmission time of the
nodes on each channel, we can estimate the conflict probabilities of the chan-
nels. Then, the nodes can compare the conflict probabilities of the channels and
select the channels with low conflicts. Since we do not need to worry about the
connectivity, the dynamic channel selection is kept simple and ecient. Simula-
tions show that this channel usage based multichannel assignment method has
a better performance than Fix-Switch and MIMC-Road in various scenarios.
We only evaluated AODV protocol with this multichannel assignment method
in this work. Because the layered network protocol architecture is preserved, we
can easily evaluate the performance with other routing and data disseminating
protocols for VANETs in the future work. We can also design a data disseminat-
ing protocol to better utilize the multichannels. Though, our method improves
the performance, we do not take the specific QoS requirements into considera-
tion. This is also a topic for the future work.
References
1. The Network Simulator: NS2,
http://www.isi.edu/nsnam/ns/
2. Wireless LAN Medium Access Control (MAC) and Physical Laye (PHY) Specifi-
3. Alicherry, M., Bhatia, R., Li, L.E.: Joint channel assignment and routing for
throughput optimization in multi-radio wireless mesh networks. In: Proc. of Mo-
biCom 2005, pp. 58-72 (2005)
4. Anguswamy, R., Zawodniok, M., Jagannathan, S.: A multi-interface multi-channel
routing (MMCR) protocol for wireless ad hoc networks. In: Proc. of WCNC 2009,
pp. 2338-2343 (2009)
5. Gupta, P., Kumar, P.R.: The Capacity of Wireless Networks. IEEE Transactions
on Information Theory 46(2), 388-404 (2000)
6. Jiang, D., Delgrossi, L.: IEEE 802.11p: Towards an international standard for wire-
less access in vehicular environments. In: Proc. of VTC 2008 Spring, pp. 2036-2040
(2008)
7. Kodialam, M., Nandagopal, T.: Characterizing the capacity region in multi-radio
multi-channel wireless mesh networks. In: Proc. of MobiCom 2005, pp. 73-87 (2005)
8. Kyasanur, P., Vaidya, N.H.: Capacity of Multi-channel Wireless Networks: Impact
of Number of Channels and Interfaces. In: Proc. of MOBICOM 2005, pp. 43-57
(2005)
9. Kyasanur, P., Vaidya, N.H.: Routing and link-layer protocols for multi-channel
multi-interface ad hoc wireless networks. Mob. Comput. Commun. Rev. 10(1),
31-43 (2006)
