Exploiting Spectral Reuse in Resource Allocation, Scheduling,and Routing for IEEE 802.16 Mesh Networks Lien-Wu Chen, Yu-Chee Tseng Department of Computer.

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Exploiting Spectral Reuse in Resource Allocation, Scheduling,and Routing for IEEE Mesh Networks Lien-Wu Chen, Yu-Chee Tseng Department of Computer Science, National Chiao-Tung University Da-Wei Wang, and Jan-Jan Wu Institute of Information Science, Academia Sinica IEEE VTC 2007

Outline  Introduction  Related work  Resource Allocation and Scheduling Schemes  Routing Tree Construction  Simulation  Conclusion

Introduction  The IEEE d specifies a centralized scheduling scheme for mesh networks  The SSs notify the BS Data transfer requirements The quality of their links to their neighbors  The BS uses the topology information along with the requirements of each SS to decide the routing and the scheduling

Background_ maintain routing tree BS broadcast MSH-CSCF (Mesh Centralized Scheduling Configuration) message to all SSs

Background_ uplink and downlink (1) BS collects MSH-CSCH: request (Mesh Centralized Scheduling) message from all SSs (2) BS broadcasts MSH-CSCH:grant to all SSs Request grant

 Title: Interference-Aware IEEE WiMax Mesh Networks  Authors: H.-Y. Wei, S. Ganguly, R. Izmailov, and Z. Haas.  From: IEEE VTC’05 Related Work

 the algorithm does not fully exploit spectral reuse and it is not load- aware Related Work

 Title: Spatial Reuse in IEEE Based Wireless Mesh Networks  Authors: L. Fu, Z. Cao, and P. Fan.  From: IEEE ISCIT’05 Related Work

link 1,4,7 and link 2,5,8 are simultaneous, respectively L8 SS 8 SS 7 SS 6 SS 5 SS 4 SS 3 SS 2 SS 1 L7 L6L5L4L3L2L1

Related Work new

 the algorithm does not fully exploit spectral reuse and it is not load- aware  Although how to attach a new SS to a mesh tree is discussed, but scheduling is not addressed in that work Related Work

Resource Allocation and Scheduling Schemes_ goal  First, dynamically adapt the bandwidths between uplink and downlink subchannels  Second, proportionally allocate frame timeslots among SSs  Finally, obtain higher gateway throughput based on the above two manners.

Resource Allocation and Scheduling Schemes_ System Model

Resource Allocation and Scheduling Schemes is uplink rate of SS i is uplink traffic demands of SS i is the demand of transmission time of SS i is the total uplink transmission time of the network is the total uplink transmission time of extended neighborhood of SS i

Resource Allocation and Scheduling Schemes time SS 1 addition The maximal transmission time for SS i = for non-real-time or best effort traffic

Resource Allocation and Scheduling Schemes, the bottleneck SS will see 100% busy carriers time

Resource Allocation and Scheduling Schemes  Channel-Level Scheduling  Link-Level Scheduling downlink time uplink Channel-Level Scheduling :

Resource Allocation and Scheduling Schemes_ link level scheduling Phase 1Phase 2

Resource Allocation and Scheduling Schemes

Routing Tree Construction

1

A={3,4,5,6,7} B={ } A={3,4,5,7} B={6 } Initial : is the highest data rate among links of SS j to its neighbors with less or equal hop count is uplink traffic demands of SS i,

Simulation System parameter :  A single channel OFDM PHY  A single BS ( node 0 )  84 SSs ( node 1 ~ 84 )  Channel bandwidth is set to 50Mb/s  Data rate of all links are the same  The extended neighborhood of each SS includes one-hop and two-hop neighbors

Simulation_ Physical Layer Parameter

Simulation_ Burst Profile

Conclusion  An integrated spectral reuse framework for centralized scheduling scheme and routing tree construction is developed  This method is most complete in exploiting spectral reuse

Thank You~