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Optimaalisen tietoliikenneverkon suunnittelu
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Plan the transmission network to connect GSM basestations ... Reported: power law ('fit get fitter', 'rich get richer') evolved into multimodal very dynamic ... – PowerPoint PPT presentation
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Title: Optimaalisen tietoliikenneverkon suunnittelu
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Optimaalisen tietoliikenneverkon suunnittelu
- Jukka K. Nurminen
- Nokia Research Center
- jukka.k.nurminen_at_nokia.com
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Cellular Network Planning
- Radio network
- Transmission network
- Packet network
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Radio Network Planning
- Composite Coverage displays
- Signal propagation models
- Heuristic frequency allocation algorithms
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Transmission Network Planning Tool
- Plan the transmission network to connect GSM
basestations with - minimum cost
- high reliability
- easy maintenance
- flexibility for growth
- Shortest path routing
- Two disjoint paths routing
- Multilayer routing
- Topology generation
- Min spanning tree
- Traveling salesman
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Packet Network Modeling
- IP, ATM
- Parameters (random variables)
- packet inter-arrival time
- number of packets in a packet call
- packet length
- reading time between packet calls
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Interrupted Poisson Process (IPP)
- ON period -exponentially distributed with mean
1/?ON - OFF period -exponentially distributed with
mean 1/?OFF - Arrival rate -exponentially distributed with
parameter ?a - Packet length
ON period
OFF period
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Queuing Models
Queuing models are suitable for describing
(modeling) packet switched nodes and networks
- l - packet arrival rate
- L average packet length
- C link capacity
- 1/m average service time
- W waiting time in the buffer
- d delay
- N number of packets in the system
- r - traffic load
m
C
Departing packets
Arriving packets
l, L
server
buffer
Outgoing link
The mean delay in the node is equal to the sum of
the mean waiting time in the buffer and the mean
service time
EdEW1/ m EWL/C
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Peer-to-peer Network Analysis
- Content sharing
- Distributed computing
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Content sharing
MP3 music, pictures, DVD movies, etc.
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How it works?
Gnutella
Napster
2. Propagate search
5. Transfer
4. Hit found
3. Transfer
1. Search
1. Register 2. Search
0. Connect
Search A.mp3
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Topologies for Content Sharing
- Reported power law (fit get fitter, rich get
richer) evolved into multimodal very dynamic - cannot be easily emulated
- Chosen options
- Random nodes have random number of connections
- Semi nodes have random number of connections, at
least 1 - ConMesh nodes connect to existing network
- ConStars ConMesh leaf nodes
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Simulation results
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Distributed computing
- Currently on distributed PCs
- Can such applications run on mobile phones?
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Lucas-Lehmer test 2p-1 is prime if and only if
S(p-1) 0 (mod 2p-1),where S(1) 4 and S(k1)
S(k)2-2.
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