IP Multicasting over DVB-T/H and e-MBMS

1. IP Multicasting over DVB-T/H and e-MBMS
December 05, 2012
S.M. Hasibur Rahman
Department of Information Technology and Media
Mid Sweden University, Sundsvall, Sweden

2. Overview
• Overall Aim
• Introduction
• Method
• Simple Model
• Random Model
• Results
• Conclusions
• Future Work
• Q & A
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3. Overall Aim
• Since spectrum is wasted in wireless broadcasting TV
distribution, multicasting would offer better spectrum
management. Moreover, two of the most important aspects
of wireless networks are coverage probability and efficient
management of spectrum. The objective of this thesis,
therefore, is to study the efficient management of spectrum
in different proposed schemes and to increase the coverage
probability in order to reduce the outage probability.
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4. Motivation
• The idea of using IP multicasting over DVB-T and
DSFN was proposed by Magnus Eriksson at Mid
Sweden University in the year 1997
• A thesis work on the same title was carried out by
Muhammad Ashfaq Malik last year (2011) at Mid
Sweden University
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5. Introduction
• Macro-Diversity
• SFN vs. MFN
• DSFN
• PARPS
• DVB-T
• e-MBMS
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6. Macro-Diversity
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7. SFN vs. MFN
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8. DSFN
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9. PARPS
• To manage these DSFNs, a special algorithm
called PARPS is suggested
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10. PARPS
• Two algorithms have been proposed namely optimized and
heuristic algorithm
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11. DVB-T
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12. eMBMS
• Stands for evolved Multimedia Broadcast Multicast Service
• eMBMS utilizes sesssion set-up scenario; resembles NCT-
DSFN
• eMBMS may transmit over SFN for multicasting or
broadcasting by using the OFDMA radio resources; known as
MBSFN
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13. MBSFN
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14. Concrete and Verifiable Goals
• Different schemes of distributing TV over wireless medium will be
designed and analyzed
– Scheme A: Unicasting over MFN
– Scheme B: Broadcasting over MFN
– Scheme-C: IP Multicasting over MFN
– Scheme-D: Broadcasting over SFN
– Scheme-E: IP Multicasting over CT-DSFN
– Scheme-F: IP Multicasting over NON-SFN DCA and
– Scheme-G: IP Multicasting over NCT-DSFN
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15. Contributions
• This work is an extension to the work done by Muhammad Ashfaq Malik
and the author has the following new results and methods:
– Scheme-E: IP Multicasting over CT-DSFN
– Scheme-F: IP Multicasting over NON-SFN DCA
– Scheme-G: IP Multicasting over NCT-DSFN
– Fading model
– Heterogeneous channel selection model
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16. Zipf-law
• This law has been employed for the channel
selection model
• The law is as follows
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17. Mathematical formulas
• SINR for MFN:
• Where
• SINR for SFN:
• A receiver is in outage state if: Г < Г0
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18. • System Spectral Efficiency
• Where,
• Mutliuser System Spectral Efficiency,
• Where,
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19. Simple Model
• NTx = Number of transmitters (4)
• NRx = Number of receivers (9)
• NCh = Number of channels (varies)
• CRx = Covered receivers (varies for SFN and MFN)
• Npro = Total number of TV programs (6)
• NPrj= Number of programs requested within a single SFN or cell j
• Г0 = required SINR (10)
• α = Propagation path loss constant (4)
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20. Scheme A: Unicasting over MFN
• A point-to-point scheme where each transmitter operates on different
frequencies
• Example: Traditional TV on cell phone,YouTube, Internet TV
• Each receiver requires a dedicated channel
• Coverage probability is calculated as
• Number of channel required would be equal to the number of receivers
available inside the coverage and calculated as below:
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21. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 21

22. Scheme B: Broadcasting over MFN
• Each transmitter transmits all the available TV programs
• Example: Traditional TV, DVB-T over MFN
• Each transmitter would require separate channel for each program;
results in high number of channel requirement
• This scheme does not increase the coverage area
• Number of channel required can be calculated as:
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23. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 23

24. Scheme C: IP Multicasting over MFN
• This point-to-multipoint system implies that each transmitter would
transmit only those programs for which currently receiver(s) exist
• Example: simple MBMS/eMBMS
• The coverage area still remains the same for this scheme
• Number of channel required can be calculated as
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25. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 25

26. Scheme D: Broadcasting over SFN
• This scheme utilizes the concept of SFN meaning all the transmitter
transmit same signal using same frequency at the same time
• Example: DVB-T over SFN
• This scheme significantly increases the coverage area
• This scheme would need single channel for a particular program
• Therefore, number of channel required can be calculated as
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27. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 27

28. Scheme E: IP Multicasting over CT-DSFN
• DSFN is used in this scheme; the term dynamic implies that
transmitters would be grouped together to form zones
• CT-DSFN implies that all the transmitter would be operating all the
time at full transmitter power
• For a system consisting of 4 transmitters, 15 possible combinations
possible i.e. 15 resource plans
• Example: The idea is new and proposed applications are DVB-T,
eMBMS
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29. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 29

30. • In PARPS, resource plan to timeslot assignment can be defined
according to:
• Queue is formed by placing a program p into the queue of one of
the zones z of resource plan r, if maximum numbers of the
receivers that are watching that program (and have joined that
multicast group) are covered by that zone. Queue is a 3-D matrix
and defined as:
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31. • After the Queue formation, task is to assign program to timeslot
• This is accomplished by
• Finally, program to timeslot and zone assignment matrix is defined
as
• And, number of channel required is calculated as
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32. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 32

33. • Queue for resource plan, 9 is:
• Resource plan to timeslot is:
• Program to timeslot is:
• Program to timeslot and zone is:
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34. Scheme F: IP Multicasting over NON-SFN
DCA
• In this scheme, no SFN is formed i.e. transmitter grouping is not
considered. Maximum one transmitter is used in each zone
• In this scheme, some transmitters can be switched off in some
resource plans
• Assignment of resource plan to timeslot, program to timeslot, and
program to timeslot and zone are the same as described in scheme
E
• However, a zone was sufficient for a single program in scheme E,
this scheme might need more than a zone for a single program
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35. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 35

36. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 36

37. • Queue for resource plan, 15 is:
• Resource plan to timeslot assignment is:
• Program to timeslot assignment is:
• Program to timeslot and zone assignment schedule is:
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38. Scheme G: IP Multicasting over NCT-DSFN
• This scheme can be described as union of scheme E and scheme F
• For a 4 transmitter system, this scheme gives a total of 51 possible
reource plans
• Assignment of resource plan to timeslot, program to timeslot, and
program to timeslot and zone are the same as described in scheme
E
• A single zone is sufficent for a single program for this scheme like
scheme E
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39. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 39

40. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 40

41. • Queue for resource plan, 8 is:
• Resource plan to timeslot is:
• Program to timeslot is:
• Program to timeslot and zone is:
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42. Coverage Probability
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43. Random Model
• Assumptions,
– NTx = Number of transmitters (4)
– NRx = Number of receivers (100)
– NCh = Number of channels (varies)
– CRx = Covered receivers (varies for SFN and MFN)
– Npro = Total number of TV programs (30)
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44. Homogeneous Case
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45. Heterogenous Case
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46. Fading
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47. Results
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48. Coverage Probability
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49. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 49

50. System Spectral Efficiency
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51. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 51

52. Multiuser System Spectral Efficiency
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53. IP Multicasting over DVB-T/H and e-MBMS2012-12-05 53

54. Resource Plan Vs. SSE of Scheme G
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55. Scheme E (15 RP) vs. Scheme G (11 RP)
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56. Scheme E vs. Scheme B and D
IP Multicasting over DVB-T/H and e-MBMS
SSE MSSE
Scheme B vs
Scheme E
Scheme D vs
Scheme E
Scheme B vs
Scheme E
Scheme D vs Scheme
E
Homogeneous
(non-fading)
740% 37% 805% 37%
Heterogeneous
(non-fading)
629% 29% 757% 29%
Homogeneous
(fading)
736% 62% 756% 62%
Heterogeneous
(fading)
592% 50% 695% 50%
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57. Scheme G vs. Scheme C and F
IP Multicasting over DVB-T/H and e-MBMS
SSE MSSE
Scheme C vs
Scheme G
Scheme F vs
Scheme G
Scheme C vs
Scheme G
Scheme F vs
Scheme G
Homogeneous
(non-fading)
316% 56% 339% 68%
Heterogeneous
(non-fading)
279% 50% 320% 66%
Homogeneous
(fading)
345% 57% 355% 61%
Heterogeneous
(fading)
425% 90% 442% 97%
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58. Conclusions
• IP multicasting over DSFN is possible
• And, PARPS is the algorithm for scheduling
• Seven schemes have been designed and analyzed
• Broadcasting is not efficient in terms of spectrum management, IP
multicasting is therefore provides better efficiency for the same amount of
TV programs
• The SFN further improves the coverage probability, SSE and MSSE
allowing more TV programs to be transmitted
• Dynamic SFN with transmitter shut off gives further gain in SSE and MSSE
• The SFN can either give better coverage probability or higher data rate
compared to the MFN
• Although dynamic SFN with transmitter shut off gives better gain, but
feasibility of this scheme for DVB-T/H is a question for further research
• However, this scheme can be adapted to the eMBMS with current
infrastructure. Scheduling might raise a question
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59. Future work
• Number of transmitters
• Real world values
• Power control
• Larger system
• Scheme G feasibility
• Different PARPS algorithm
• Scheme H: Unicasting over SFN
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60. Q & A!
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