?a???s?as? t?? PowerPoint

1
?ß??d??? ???t?? ??????????? ?s??µat?? ???sßas??
sta 5/60 GHz
??a??s??? ????? (?p. ??d.) ???sta?t???? ?as??????
(?p. ??d.) ?????a?? ??????? (?et. F??t.)
?????a?? ?a??t???? (?p. ??d.) ??t???? ?a?a?????
(??d.) ?e???da? ??eße???a? (?p. ??d.)

• ??µ??????a µ?a? ??f??a? a??µesa st? ????
  s????t?t?? t?? 5GHz ?a? a?t?? t?? 60GHz (?????
  ?de?a)
• p??te????ta? ??a t?p??? as??µat? d??t?? d??
  s????t?t?? p?? e?asfa???e? t?? ?µa?? e?????? t??
  ?p?????sa? OFDM te???????a? HIPERLAN/2 µe t??
  e?s?µ?t?s? t?? ????? t?? 60GHz.
• ? ep??tas? t?? HIPERLAN/2 st? ???? t?? 60GHz
  ???µ??eta? HIPERSPOT ?a? a??????e? t??? ?a???e?
  t?? ?at? pe??pt?s? d??t??? (ad-hoc),
  e?asfa?????ta? t?? e?a??a?? a??µesa st?? d??
  s????t?te? pa??????a µe t? pa???? ?p??es???
  ?????? p???t?ta?.

• ??a p?atf??µa ??a s?µe?a ?????? p????t?ta?
  ???st?? (hot spots) p?? pe???aµß????? t?s?
  ?d??t???? (e-home) ?s? ?a? d?µ?s?e? (fast outdoor
  downloading) efa?µ????.
• ?pe?te??e? ?a? s?µp?????e? ta ?p?????ta as??µata
  t?p??? d??t?a (WLANs) e??e?a? ????? sta 5GHz
  ???s?µ?p????ta? t? s????t?ta t?? 60GHz ?a?,
  pa??????a, ??a??p??e? t?? apa?t?se?? t??
  s???????? ???st? ??a ?????? ta??t?te? µet?d?s??.
• ?p?st????e? t? ????t???t?ta t?? ???st?? se
  s??d?asµ? µe t? pa???? ?????? ????t???t?ta? st?
  p????pt?? s?st?µa (240Mbps).

• ?? s?µe?? p??sßas?? (Access Point) ?e?t????e?
  ta?t?????a ?a? st?? d?? s????t?te? e?? ta ????t?
  te?µat??? (Mobile Terminals) p??pe? ?a µetap?d???
  d?a???? ap? t? µ?a s????t?ta ?e?t?????a? st??
  ????.
• ?e???d??? ? µ?, ???? ?? ??µß?? s??t??????ta? se
  ??a p???a????sµ??? ?a???? t?? 60GHz, ß??s????
  t??? ?e?t??????? t??? ??µß??? (one-hop away) ?a?
  st?????? t? p????f???a st? s?µe?? p??sßas??
  (Neighborhood Discovery).
• ?? s?µe?? p??sßas?? e??a? ?pe????? ??a ??e? t??
  ap?f?se?? d??µ?????s?? (routing decisions) ?p??
  ep????? s????t?ta? ?e?t?????a?, ep?????
  µ???pat??? sta 60GHz, ?a????sµ?? t?? ????? ???e
  te?µat????.

• ???a? a?a??a?? t? s??µa p??sßas?? st? µ?s? ?a
  ep?t?????e? ????? ???µap?d?s? ?ste ?a
  ??a??p?????ta? ?? apa?t?se?? t?? s?st?µat??.
• ?a d?? p??a?? ?p???f?a p??t?????a (CSMA ? TDMA)
  a??????????a? ?a? s????????a? a?a??t???.
• S?µp??asµa e?a?t?a? t?? ap??s?a? ?e??? pe???d??
  ?a? s??????se??, t? TDMA s??µa ep???????e ?? ?
  ß?s? ??a t?? ep?te??? ?????te??? ???µ??.

• ????S???S??S
• K. Oikonomou, A. Vaios, S. Simoens, P. Pellati,
  I. Stavrakakis, "Centralized Ad-Hoc Network
  Architecture (CANA) Based on an Enhanced
  HiperLAN/2 System", PIMRC 2003, 7-10 September,
  Beijing, China.
• A. Vaios, K. Oikonomou, N. Zinelis, K.
  Ntagkounakis, I. Stavrakakis, "On Supporting
  Dual-Mode HiperLAN/2 Architecture and Overhead",
  13th IST Mobile Wireless Communications Summit
  2004, June 27-30, Lyon, France.
• K. Oikonomou and I. Stavrakakis, "Analysis of a
  Probabilistic Topology-Unaware TDMA MAC Policy
  for Ad-Hoc Networks", IEEE JSAC Special Issue on
  Quality-of-Service Delivery in Variable Topology
  Networks, vol. 22, no. 7, September 2004.
• Antonis Panagakis, Elias Balafoutis, Ioannis
  Stavrakakis, "Study of the capacity of multi-hop
  cellular networks", Quality of Future Internet
  Services (QoFIS) 2003, 1-3 October 2003,
  Stockholm, Sweden.
• A. Vaios, N. Zinelis, I. Stavrakakis, "Employing
  Ad Hoc Networks in WLANs Trade offs and
  Insights", International Conference on Next
  Generation Teletraffic and Wired/Wireless
  Advanced Networking (NEW2AN'04), Feb. 2-6, 2004,
  St. Petersburg, Russia.
• A. Vaios, K. Oikonomou, P. Pellati, S. Simoens,
  I. Stavrakakis, "A Dual-Band HiperLAN/2-based
  Architecture for Indoor Hotspot Applications",
  International Workshop on Wireless Ad-Hoc
  Networks (IWWAN) 2004, 31st May - 3rd June, 2004,
  Oulu, Finland.
• N. Laoutaris, B. Van Houdt, I. Stavrakakis,
  "Optimization of a Packet Video Receiver Under
  Different Levels of Delay Jitter An Analytical
  Approach ", Performance Evaluation, vol. 55, no.
  3-4, pp. 251-275, Feb. 2004.
• N. Laoutaris, V. Zissimopoulos, I. Stavrakakis,
  "Joint Object Placement and Node Dimensioning for
  Internet Content Distribution", Information
  Processing Letters, vol. 89, no. 6, pp. 273-279,
  March 2004.

? t?p?????a t?? f?s???? s?ed??? t?? ?????µat??

• ??e?e??????a? p??s?µ???se?? µe t? ß???e?a t??
  ns-2, ?p?? ?a? a?apt?????a? se ??d??a ??e? ??
  ep?µ????? µ???de? t?? s?st?µat??.
• ? ????t???t?ta t?? te?µat???? µ??te??p??????e
  µ?s? t?? waypoint model (a?aµ????ta? µ?????
  ta??t?te? sta ?e??µe?a hot spots).
• ?????te??? ???µ?? µet?d?s?? µeta?? d?? ????t??
  te?µat???? sta 60GHz ep?t???????ta? ?ta? a?t?
  ß??s???ta? p?? ???t? (4-6 µ?t?a).
• ?a µ???p?t?a sta 60GHz e??a? ?e???? p???ap???
  a?µ?t?? a? ?a? d?ad??µ?? p?? ap?te????ta? ap?
  p???? ??µata de? ????? µe???? d????e?a ???? ????
  t?s? t?? ?a?a?t???st???? d??d?s?? st? ??a
  s????t?ta, ?s? ?a? t?? µ????? eµß??e?a?
  ep????????a? (10 µ?t?a).
• ? d????e?a ???? e??? µ???pat??? sta 60GHz
  a????eta? ?a??? µe???eta? ? a???µ?? t?? a?µ?t??
  ap? ta ?p??a ap?te?e?ta? ?/?a? ?p??????
  apa?t?se?? ??a ??????? ???µ??? µet?d?s??.
• ?et?????e t? ??st?? ??a t?? e??es? t?? ?e?t?????
  sta 60GHz (overhead of ND) ?? t? p?s?st? t??
  ?????? p?? spata?e?ta? ??a ?a d?at?????ta? p???
  ap? t? 90 t?? ???sµ???? µ???pat??? e?e???.
• ????? t? ??st?? se ??e? t?? pe??pt?se??, ?s?
  pe??ss?te??? ?? ??µß?? t?s? pe??ss?te?a ta p??a??
  µ???p?t?a a??? ?a? t? s??????? ??st??.

IST Broadway Project The Way to Broadband
Access at 60 GHz