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Wireless Token Ring Protocol for Mission Critical Wireless Networks

The Wireless Token Ring Protocol (WTRP) is a medium access control protocol designed for mission critical wireless networks, offering bounded latency and reserved bandwidth. This protocol uses token passing to define the transmission order and each token has a specified time limit. The ring is identified by a unique ring ID based on the MAC address of one of the stations, with the owner station changing when the current owner leaves. WTRP supports operations such as inviting, contending, and passing the token, as well as management functions like ring recovery and token recovery. Berkeley WOW Group at the University of California, Berkeley has developed WTRP and provides user-space and kernel implementations, as well as performance analysis tools.

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Wireless Token Ring Protocol for Mission Critical Wireless Networks

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  1. WIRELESS TOKEN RING PROTOCOL Mustafa Ergen, Duke Lee, Ruchira Datta, Jeff Ko, Anuj Puri, Raja Sengupta, Pravin Varaiya wow.eecs.berkeley.edu Berkeley WOW Group University of California Berkeley WOW

  2. Introduction • The Wireless Token Ring Protocol (WTRP) is a medium access control protocol for wireless networks in mission critical systems. • It supports quality of service in terms of bounded latency and reserved bandwidth. • The token passing defines the transmission order, and each token is forced to give up the token after a specified amount of time. • Each ring has unique ring id based on unique MAC address of one of the stations of the ring. (The station is called the owner of the ring). • When owner leaves the ring, another station elects itself to be the owner of the ring. WOW

  3. Descriptions (Operations) Invite Contend Token Token 1. SET_SUC C 2. SET_PRED A A C B F D E Joining: Stations periodically invite other nodes to join the ring by broadcasting the available resources left in the medium Leaving: When B wants to leave, it requests A to connect to its successor, C. If A does not have connection with C, then it connects to the next node in terms of the transmission order of the ring. WOW

  4. Descriptions (Management) C A B 6 2 6 2 F D 2 2 E 1. Retransmit TOKEN 6 6 6 2 2. SET_PRED A 2 6 6 6 6 Ring Recovery Able to recover quickly by keeping information about topology of the ring, recovers from multiple simultaneous faults by taking increasingly drastic actions Token Recovery Multiple token is deleted using unique priority of token based on generation sequence number and token ring address pair. WOW

  5. WTRP Deliverables WOW

  6. WTRP USER-SPACE WOW

  7. WTRS-WTR Simulator WOW

  8. WTRP-Kernel WOW

  9. Performance Analysis WOW

  10. Performance Analysis WOW

  11. Performance Analysis WOW

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