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Wireless LAN Support For 3COM Palm Pilot

Technion – Israeli Institute of Technology Computer Networks and Digital Labs Yuval Frandzel & Alec Shnapir. Wireless LAN Support For 3COM Palm Pilot. Winter/Spring 2000. Project Goals. Definition of a wireless network for distribution of information to PDA devices.

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Wireless LAN Support For 3COM Palm Pilot

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  1. Technion – Israeli Institute of Technology Computer Networks and Digital Labs Yuval Frandzel & Alec Shnapir Wireless LAN Support For 3COM Palm Pilot Winter/Spring 2000

  2. Project Goals • Definition of a wireless network for distribution of information to PDA devices. • Simulation of the proposed network and performance analysis in several configurations. • Comparison of the proposed network with the CSMA protocol.

  3. Description • With the emergence of a new mobile breed of computing platform – the handheld Personal Digital Assistant (PDA) – the possibility of distributing personalized information to users “on the go” in public venues has become a reality. • This information distribution is envisioned as a user transparent, web like experience whereby a user surfs for information on his PDA. The PDA communicates with a local information server, or “information kiosk”, placed in the facility where the user is (e.g. malls, airports etc.).

  4. Description (cont…) • The most obvious form of mobile communication is a wireless, radio frequency network. This project discusses the primary issues affecting such a network, proposes a MAC protocol to address these issues and analyzes the results of several simulations of the proposed protocol in varying configurations. In addition, the project describes how to cover large areas with a cellular arrangement.

  5. Existing Characteristics • Users are mobile. • Server messages are longer than client messages.

  6. System Requirements • Cheap. • Low power usage. • User transparent operation. • Allow easy detection of network by new clients.

  7. MAC Protocol Characteristics • Server messages have priority. • Predefined, bound number of clients can be processed at once in every cell. • Access points always transmit at regular intervals. • Overall cellular layout of access points in the network.

  8. Tp Tms 2 3 1 Tmc Td 1 2 n 3 Trt,1 Trt,2 Trt,3 Tfs,max Description of MAC protocol Trt, n=Tp - (n -1)*Td - (n - 2)*Tmc+n*Tms+ (n -1)*Tfs,max Tfs,max = nmax*(Tmc + Td)

  9. Overview of Operation Tp Tms AP Request by client ACK by AP Answer by AP CLIENT Trt Ttx Tmc Ttx – time to successful transmission Tmc – client’s message transmission time Tms – AP’s message transmission time Tp – server’s response time Trt – roundtrip time Client wants to send a request

  10. Simulation Goals • Overall behavior of the new protocol. • Comparison between the new protocol and vanilla CSMA. • Comparison of different AP channel governing policies • No short • Binary • Linear

  11. Simulation Results

  12. Simulation Results (cont…)

  13. Conclusions • The proposed protocol out performs vanilla CSMA. • The simulation found that out of the three AP channel governing policies, the binary policy was the best.

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