Transcript iP2P: A Peer to Peer System for Mobile Devices

Author by : Chien-Chn Huang-Fu and Yi-Bing Lin , National Chiao Tung University .
Herman Chung-Hwa Rao , Far EasTone Telecommunications Co., LTD.
IEEE Wireless Communications April 2009
Advisor : Whai-En Chen
Speaker : Yen-Neng Pan
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HYBRID P2P
 Utilized centralized servers to maintain the
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mapping between the identifications
PURE P2P
 Query for identifying the transport address of
participating peer is flooded through the network
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To implement a P2P system for mobile devices that
have the capability to access mobile telecommunication
networks, such as the Universal Mobile
Telecommunications System, this paper propose a pure
P2Psystem called iP2P.
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Step 1 – peer start the P2P application, which
attach to IP network
Step 2 – the peer registers to the centralized
server by providing its id and address
Step 3 – the calling peer queries the
centralized server to retrieve the address of
the called peer
Step 4 – upon receipt the address, the calling
peer establihe a P2P connection to called
peer without centralized server.
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Use Mobile Station ISDN number as the peer
identification which is globally unique.
The iP2P control message are encapsulated in
SMS.
iP2P module
 iP2P Control Function is responsible accessing iP2P
Control Message through the SMS API and controlling
the connection through the iP2P Socket API
 iP2P Socket API is the standard socket API with minor
modifications.
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STUNT solution pose problems:
 Setting an appropriate TTL value of SYN packet
might not be trivial.
 The port prediction server cannot guarantee to
provide transport mapping of the public and
private transport address for the NAT
server.(especially some NAT server randomly
assign.)
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iP2P reuse UMTS mobility management
mechanism and SMS as th control protocol
Implemented the system on Windows Mobile
6.0 Professional OS.
The measured data from 200 experiments:
 Connection set-up time:21.724 sec
 SMS Delivery time: 2.637 sec
 WiFi Network Attach time :9.428 sec
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Advantage
 Efficient query without a requirement to
implement its own centralized server.
 Use SMS push mechanism to establish P2P
connection can significantly save power
consumption in the mobile device
 Allow more flexible IP address allocation
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