SSCH: slotted seeded channel hopping for capacity improvement in IEEE 802.11 ad-hoc wireless networks

  • Authors:
  • Paramvir Bahl;Ranveer Chandra;John Dunagan

  • Affiliations:
  • Microsoft Research, Redmond, WA;Cornell University, Ithaca, NY;Microsoft Research, Redmond, WA

  • Venue:
  • Proceedings of the 10th annual international conference on Mobile computing and networking
  • Year:
  • 2004

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Abstract

Capacity improvement is one of the principal challenges in wireless networking. We present a link-layer protocol called Slotted Seeded Channel Hopping, or SSCH, that increases the capacity of an IEEE 802.11 network by utilizing frequency diversity. SSCH can be implemented in software over an IEEE 802.11-compliant wireless card. Each node using SSCH switches across channels in such a manner that nodes desiring to communicate overlap, while disjoint communications mostly do not overlap, and hence do not interfere with each other. To achieve this, SSCH uses a novel scheme for distributed rendezvous and synchronization. Simulation results show that SSCH significantly increases network capacity in several multi-hop and single-hop wireless networking scenarios.