Adaptive Allocation Algorithm for Multi-Radio Multi-Channel Wireless Mesh Networks
2. Related Work
3. Mathematical Formulation of Adaptive Channel Allocation Problem
3.3. Network Mathematical Model
- The total number of NICs over the network should not exceed .
- The output number of assigned NICs for should be at least one. Suppose it will be ; therefore, where .
- Each link should be assigned to a channel , where .
- The maximum number of assigned channels is k.
- The chosen channel for the link at both APs’ NIC must be the same .
- The number of channels assigned to the links adjacent to must be or less.
3.4. The Outputs
- The number of NICs assigned to , .
- The channel between the two APs and , .
3.5. The Problem Formalization
4. Adaptive Channel Allocation Algorithm
4.1. The Initial Channel Allocation
4.1.1. NIC Deploying Stage
- NIC Initialization
- Compute the load per AP from link traffic :
- Allocate one NIC to every AP: as a default.
- Assign the traffic for each NIC by:
- Set the number the allocated NICs: AN = N.
- NIC Deployment
- Add one NIC to an AP (suppose ) where reaches the maximum load while maintaining . After that, and .
- Stop the phase if or the physical constraint () is reached for every AP.
- Recalculate the traffic:
- Return to step (i).
4.1.2. The Fixed Channel Allocation
- Compute the collision for the traffic:
- Arrange the links according to the collision in a descending order.
- Allocate to the most crowded link, let be the first link, and assign to both ’s first NIC and ’s first NIC.
- Allocate the links’ channel according to the following filtration steps:
- Mandatory channel allocation:
- Allocate to link if both and have NICs allocated to . If there are two or more such for both and , select the channel that minimizes without consideration to un-allocated links.
- If has only one NIC allocated with , and has no channel, then the link is allocated and one ’s NIC allocates to the same channel.
- Variety channel allocation:
- For each link , and have both un-allocated NICs, then select that minimizes without consideration to un-allocated links.
- if and have two or more NICs in allocated channels , then the link is allocated to minimize without consideration to un-allocated links.
- Priority channel allocation change: If and are allocated to and sequentially and and is not an allocated channel, then the channel allocation priority for that link is increased. Return to step 2 after multiplying by a constant number greater than one.
- Manage un-utilized NICs: After the completion of channel allocation for every link in the network, if there are unused NICs, these NICs are switched to other APs with the maintenance of the constraints, and then return to step 2.
4.2. The Adaptive Channel Allocation
- Step (1)
- We begin by calculating the traffic of GW’s links, where these links are assigned the same channel p, :
- Step (2)
- We compute the decision factor:
5. Simulation Module Implementation
5.1. Modified NS-2 Simulator for IEEE802.11n
5.2. Simulation Instances
5.3. Network Topology 1 Simulation Results
5.3.1. Case 1
5.3.2. Case 2
5.4. Network Topology 2 Simulation Results
5.4.1. Case 1
5.4.2. Case 2
6. Conclusions and Future Work
Conflicts of Interest
|FCA||Fixed Channel Allocation|
|ACA||Adaptive Channel Allocation|
|NIC||Network Interface Card|
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|link between the access point (AP) and|
|F||interference matrix between links|
|expected throughput between and|
|C||the matrix of interfered channels|
|the maximum number of network interface cards (NICs) that can be allowed to|
|the output assigned number of NICs to|
|the assigned channel to|
|maximum number of hosts per one NIC|
|total interference of gateway (GW) adjacent links|
|number of channel re-allocations|
|Time Slot||9 s|
|Short Interframe Space||16 s|
|DCF Interframe Space||34 s|
|Preamble Length||16 s|
|Physical Layer Convergence Protocol Header||48 bits|
|Physical Layer Convergence Protocol Rate||6 Mbps|
|Basic Data Rate||54 Mbps|
|Data Rate||300 Mbps|
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Hassan, W.; Farag, T. Adaptive Allocation Algorithm for Multi-Radio Multi-Channel Wireless Mesh Networks. Future Internet 2020, 12, 127. https://doi.org/10.3390/fi12080127
Hassan W, Farag T. Adaptive Allocation Algorithm for Multi-Radio Multi-Channel Wireless Mesh Networks. Future Internet. 2020; 12(8):127. https://doi.org/10.3390/fi12080127Chicago/Turabian Style
Hassan, Walaa, and Tamer Farag. 2020. "Adaptive Allocation Algorithm for Multi-Radio Multi-Channel Wireless Mesh Networks" Future Internet 12, no. 8: 127. https://doi.org/10.3390/fi12080127