This paper reviews the techniques for one of the unsolved problem of tackling channel management and deciding which one is most efficient in proper channel management technique and employs better usage of wireless Spectrum (which includes assigning APs, Detecting interference among clients/APs etc.).The main reason for the interference is improper channel assignment with access points and clients in WLAN. The common solution to this complication is assigning different channels to the access points which are having common areas across the range. In this paper we study CACAO: Distributed Client-Assisted Channel Assignment Optimization for Uncoordinated WLANs and Minimum Interference Channel Assignment Algorithm for Multicast in a Wireless Mesh Network. In this we are going to study multiple interfaces with multiple channels having interference in them and problems associated with the channels like less bandwidth, throughput and channels reusability. One approach is LCCS (Least Congested Channel Search) based approach which is AP-centric in nature and involves an AP monitoring its channel for interference from other APs sharing the same physical space. Another approach which has a better chance for channel management over LCCS is based on “Conflict Set Coloring” formulation. This approach breaks down channel management into two different sets of tasks, Load balancing and channel assignment. CACAO (Client Assisted Channel Assignment Optimization) is another efficient algorithm since it is distributed as well as it enables the APs to automatically configure their channels depending on their local traffic log. MICA (Minimum Interference Channel Assignment Algorithm) algorithm is also reviewed which is having better efficiency than others.

channel interference, congestion, channel assignment

[1] Wu, Yafeng, et al. "Realistic and efficient multi-channel communications in wireless sensor networks." INFOCOM 2008. The 27th Conference on Computer Communications. IEEE. IEEE, 2008.
[2] Marina, Mahesh K., Samir R. Das, and Anand Prabhu Subramanian. "A topology control approach for utilizing multiple channels in multi-radio wireless mesh networks." Computer networks 54.2 (2010): 241-256.
[3] Xiaonan Yue, Chi-Fai Michael Wong, and Shueng-Han Gary Chan, “CACAO: Distributed Client-Assisted Channel Assignment Optimization for Uncoordinated WLANs”, 2011.
[4] Kyasanur, Pradeep, and Nitin H. Vaidya. "Routing and interface assignment in multi-channel multi-interface wireless networks." Wireless Communications and Networking Conference, 2005 IEEE. Vol. 4. IEEE, 2005.
[5] Ramachandran, Krishna N., et al. "Interference-aware channel assignment in multi-radio wireless mesh networks." INFOCOM 2006. 25th IEEE International Conference on Computer Communications. Proceedings. IEEE, 2006.
[6] Das, Arindam K., Rajiv Vijayakumar, and Sumit Roy. "WLC30-4: static channel assignment in multi-radio multi-channel 802.11 wireless mesh networks: issues, metrics and algorithms." Global Telecommunications Conference, 2006. GLOBECOM`06. IEEE. IEEE, 2006.
[7] Sangil Choi and Jong Hyuk Park 2, Minimum Interference Channel Assignment Algorithm for Multicast in a Wireless Mesh Network, 2016.
[8] Arunesh Mishra ,Vladimir Brik, Suman Banerjee, Aravind Srinivasan, William Arbaugh, “A Client-driven Approach for Channel Management in Wireless LANs”,2006.
[9] Mishra, Arunesh, Suman Banerjee, and William Arbaugh. "Weighted coloring based channel assignment for WLANs." ACM SIGMOBILE Mobile Computing and Communications Review 9.3 (2005): 19-31.
[10] Das, Arindam K., Rajiv Vijayakumar, and Sumit Roy. "WLC30-4: static channel assignment in multi-radio multi-channel 802.11 wireless mesh networks: issues, metrics and algorithms." Global Telecommunications Conference, 2006. GLOBECOM`06. IEEE. IEEE, 2006.
[11] Peters, Steven W., and Robert W. Heath. "Cooperative algorithms for MIMO interference channels." IEEE Transactions on Vehicular Technology 60.1 (2011): 206-218.
[12] Marina, Mahesh K., Samir R. Das, and Anand Prabhu Subramanian. "A topology control approach for utilizing multiple channels in multi-radio wireless mesh networks." Computer networks 54.2 (2010): 241-256.
[13] Gomadam, Krishna, Viveck R. Cadambe, and Syed A. Jafar. "A distributed numerical approach to interference alignment and applications to wireless interference networks." IEEE Transactions on Information Theory 57.6 (2011): 3309-3322.
[14] Tingjuan Yao, Xiaodong Guo, Yihong Qiu, and Liansheng Ge. "An integral optimization framework for WLAN design", 2013 15th IEEE International Conference on Communication Technology, 2013.