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CATV Networks Bandwidth Allocation for the Upstream Channel

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Developing an efficient scheduling algorithm for the Cable Modem Termination System (CMTS) ... Yet unmapped time. Mini slots. Requests ... – PowerPoint PPT presentation

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Title: CATV Networks Bandwidth Allocation for the Upstream Channel


1
CATV Networks Bandwidth Allocation for the
Upstream Channel
mid term presentation (winter 2001)
A project by Chen Yaniv 031763071 Lavi
Abramovich 032214363
Instructor Nir Menkerman
2
Project Definition
Learning and Understanding the DOCSIS/MCNS cable
modems protocol.

Developing an efficient scheduling algorithm for
the Cable Modem Termination System (CMTS).

Demonstrate the algorithm behavior with a
software implemented simulator.

3
Why Cable Network ?(Physical Layer)
Transparent IP Traffic, Through The
Data-Over-Cable System
- Economic
  • Broadband communication
    service.

- Widespread
- Integrate all communication services (Video,
Data)
4
Bandwidth Allocation MAC Layer
The upstream channel is modeled as a stream of
mini-slots.
The CMTS allocates the upstream slots by
broadcasting a map message to the CMs.
Mini slots
Previous map
current map
Yet unmapped time
5
Requests
  • The map includes allocation of the following
    types of upstream messages for the CMs (SIDs)
  • Unicast (data or request) supports piggyback
  • Multicast (requests)
  • Data/Request immediate access
  • contention resolution based on exponential back
    off .

6
Map Properties
7
CMST Transportation Policy
QoS demands for Min/Max bandwidth, Timing

8
Best Effort
We will focus on developing the algorithm for
supplying the regular users, the best bit rate
possible.
9
Best Effort Example
N 4 C 100
N 2 C 20
N 1 C 5
N 1 C 0
50
30
20
10
10
Work Plan
Week 9-10 - finish the algorithm development and
understanding the simulator environment.
Week 11-12 develop the simulator.
Week 13-14 debugging and problem solving.
Week 14 conclusions and final report.
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