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Using 802.11 in an FTTP Application
FTTP Application
FTTP with 802.11
Issues to Consider <ul><li>Equipment Availability </li></ul><ul><li>Security </li></ul><ul><li>Bandwidth </li></ul><ul><li...
Service Offerings <ul><li>Data Services </li></ul><ul><ul><li>5Mbps downstream / 2Mbps upstream </li></ul></ul><ul><ul><li...
802.11 Data Rates 20 10 - 54 25 15 - 48 35 25 - 36 45 30 - 24 50 40 - 18 50 45 50 11(b)/12(a/g) 55 50 - 9 65 60+ 60 5.5(b)...
Quality Of Service <ul><li>Voice and video data have QOS requirements </li></ul><ul><li>Data services can be supported usi...
Point Coordination Function <ul><li>ONT could be used as Point Coordinator </li></ul><ul><li>ONT polls phones for voice tr...
802.11e QOS Methods
802.11e Traffic Priorities <ul><li>8 traffic priorities are used from 802.1d </li></ul><ul><ul><li>Background (1) </li></u...
Arbitration Inter Frame Space
HCCA <ul><li>QOS equivalent to PCF </li></ul><ul><li>Allows for contention period and contention free period </li></ul><ul...
Results from Simulation DCF vs EDCA
Conclusions <ul><li>802.11 could be used to deliver current FTTP services </li></ul><ul><li>802.11e can provide QOS </li><...
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Graham Higgins

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Graham Higgins

  1. 1. Using 802.11 in an FTTP Application
  2. 2. FTTP Application
  3. 3. FTTP with 802.11
  4. 4. Issues to Consider <ul><li>Equipment Availability </li></ul><ul><li>Security </li></ul><ul><li>Bandwidth </li></ul><ul><li>Propagation distances </li></ul><ul><li>Quality of Service </li></ul>
  5. 5. Service Offerings <ul><li>Data Services </li></ul><ul><ul><li>5Mbps downstream / 2Mbps upstream </li></ul></ul><ul><ul><li>15Mbps downstream / 2 Mbps upstream </li></ul></ul><ul><ul><li>30 Mbps downstream / 5 Mbps upstream </li></ul></ul><ul><li>Video Services </li></ul><ul><ul><li>Today optical wavelength overlay </li></ul></ul><ul><ul><li>Future – IP TV </li></ul></ul><ul><ul><ul><li>3-4 Mbps per channel </li></ul></ul></ul><ul><ul><ul><li>19 Mbps per channel (high definition) </li></ul></ul></ul><ul><li>Telephony Service </li></ul><ul><ul><li>4 voice channels (analog today) </li></ul></ul><ul><ul><li>VOIP – 100Kbps per voice channel </li></ul></ul>
  6. 6. 802.11 Data Rates 20 10 - 54 25 15 - 48 35 25 - 36 45 30 - 24 50 40 - 18 50 45 50 11(b)/12(a/g) 55 50 - 9 65 60+ 60 5.5(b)/6(a/g) 75 - 75 2 90+ - 90+ 1 802.11g 802.11a 802.11b Data Rate (Mbps)
  7. 7. Quality Of Service <ul><li>Voice and video data have QOS requirements </li></ul><ul><li>Data services can be supported using DCF </li></ul><ul><li>Consider using PCF </li></ul><ul><li>Enhanced QOS mechanisms are specified in 802.11e </li></ul>
  8. 8. Point Coordination Function <ul><li>ONT could be used as Point Coordinator </li></ul><ul><li>ONT polls phones for voice traffic </li></ul><ul><li>ONT can “pace” the downstream video traffic </li></ul><ul><li>No control over upstream data packet size </li></ul><ul><li>If VOIP packet size could be set, then PCF may achieve QOS </li></ul><ul><li>Better alternatives available from 802.11e </li></ul>
  9. 9. 802.11e QOS Methods
  10. 10. 802.11e Traffic Priorities <ul><li>8 traffic priorities are used from 802.1d </li></ul><ul><ul><li>Background (1) </li></ul></ul><ul><ul><li>Background (2) </li></ul></ul><ul><ul><li>Best Effort (0) </li></ul></ul><ul><ul><li>Best Effort (3) </li></ul></ul><ul><ul><li>Video (4) </li></ul></ul><ul><ul><li>Video (5) </li></ul></ul><ul><ul><li>Voice (6) </li></ul></ul><ul><ul><li>Voice (7) </li></ul></ul><ul><li>These are mapped to 4 Access Categories </li></ul><ul><ul><li>Voice </li></ul></ul><ul><ul><li>Video </li></ul></ul><ul><ul><li>Best Effort </li></ul></ul><ul><ul><li>Background </li></ul></ul>
  11. 11. Arbitration Inter Frame Space
  12. 12. HCCA <ul><li>QOS equivalent to PCF </li></ul><ul><li>Allows for contention period and contention free period </li></ul><ul><li>Polling in contention free period include QOS details </li></ul><ul><li>Allows HC to fairly allocate medium considering QOS </li></ul><ul><li>Contention period uses EDCA </li></ul>
  13. 13. Results from Simulation DCF vs EDCA
  14. 14. Conclusions <ul><li>802.11 could be used to deliver current FTTP services </li></ul><ul><li>802.11e can provide QOS </li></ul><ul><li>No growth path for HD TV </li></ul><ul><li>Not useful for MDU application </li></ul><ul><li>IP phones currently too expensive </li></ul><ul><li>Security can be managed with pre-shared keys </li></ul><ul><li>Unlikely to become a common ONT interface </li></ul>

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