Multihop Wireless Network MWN: A wireless network adopting multihop wireless technology without deployment of wired backhaul links Similar to Mobile Ad hoc Networks MANET, but Simi
Trang 1Multihop Wireless Networks
Ray-Guang Cheng
Associate Professor
Department of Electronic Engineering,
National Taiwan Univ of Science and Technology,
Taipei, Taiwan Email: crg@mail.ntust.edu.tw
Trang 2Status of Selected Standards
Trang 3 Multihop Wireless Network (MWN):
A wireless network adopting multihop wireless technology without deployment of wired backhaul links
Similar to Mobile Ad hoc Networks (MANET), but Similar to Mobile Ad hoc Networks (MANET), but
Nodes in MWN is relative ‘ixed’
MWN may introduce ‘hierarchy’network architecture
Trang 4Multihop Wireless Networks
Relay:
Tree based topology, one end of the path
is the base station
Dedicated carrier owned infrastructure
Mesh:
Mesh topology, multiple connections among users
Routing by carrier owned infrastructure or subscriber equipment
Trang 5Multihop Wireless Networks
Benefit of multi-hop technology
Rapid deployment with lower-cost backhaul
Easy to provide coverage in hard-to-wire areas
Under the right circumstances, it may
Extend coverage due to multi-hop forwarding
Extend coverage due to multi-hop forwarding
Enhance throughput due to shorter hops
Extend battery life due to lower power transmission
Price paid
Routing complexity
Path management
Extra delay due to multihop relaying
Trang 6Related Standards & Proposals
Relay
3GPP
Opportunity Driven Multiple Access (ODMA), a communication relaying protocol proposed for UMTS TDD mode
mode
IEEE 802.16
IEEE 802.16j, Multihop relay (MR) enhancement of IEEE 802.16e (Mobile WiMAX)
Trang 7Related Standards & Proposals
Mesh
IEEE 802.11
IEEE 802.11s, ESS Mesh Networking enhancement of IEEE 802.11
IEEE 802.15
IEEE 802.15
IEEE 802.15.5 WPAN Mesh Networking
Extend coverage and enhance reliability
IEEE 802.16
MAC layer mesh extension of IEEE 802.16, optional mode,
no one implement it due to its complexity
Trang 8IEEE 802.16j Multihop Relay
Trang 9IEEE 802.16j Deployment Scenarios
Fixed Infrastructure
In-Building Coverage
BS
Temporary
Coverage
Coverage On Mobile Vehicle
Trang 1016j Progress History
Pre-Study Phase (May ~ July 2005)
Scope and Purpose discussion:
Mobile Multihop Relay Study Group was chartered in July 2005
Study Group Phase (Sep 2005 ~ Mar 2006)
Feasibility discussion
PAR (Project Authorization Request) approved in March 2006.
PAR (Project Authorization Request) approved in March 2006.
Task Group Phase (May 2006 ~ Now )
Relay TG Chair: Mitsuo Nohara, KDDI Lab.
Guideline Document Discussion (May ~ Sep 2006)
Baseline Document (Spec.) Discussion (Nov 2006 ~ Now)
1st Letter Ballot on P802.16j/D1 failed (67%, Aug 2007)
1059 comments submitted in Meeting #51, resolved in Meeting #52 (Nov 2007) P802.16j/D2
WG Letter Ballot on 802.16j/D2
631 comments submitted and resolved in Meeting #53 P802.16j/D3
Trang 11IEEE 802.11s
Source: IEEE 802.11s Tutorial
Trang 12IEEE 802.11s Deployment Scenarios
Military
University Campus
Community Area
Park Area
University Campus
Community Area
Park Area
University Campus
Community Area
Park Area
Military
Trang 1311s Progress History
Pre-Study Phase (Nov 2003)
Scope and Purpose discussion
IEEE 802.11 ESS Mesh Study Group was chartered
Study Group Phase (Jan 2004 ~ May 2004)
Feasibility discussion
PAR (Project Authorization Request) approved in May 2004.
Task Group Phase (July 2004 ~ Now )
Call for proposal (Jan 2005), 15 proposals were presented until July 2005
Baseline Document (Spec.) Discussion (Mar 2006 ~ Now)
1 st Letter Ballot on P802.11s/D1 failed (48.3%, Dec 2006)
P802.11s/D2 is approved in Jan 2008, which is ready for the
2 nd Letter Ballot (Feb 2008)
Trang 14Case Study: WIFLY
M-Taipei:
adopts Wi-Fi technology to build the network
calls for a build-and-operate (BO) tender that grants a nine-year franchise of construction and operation without transferring networking facilities operation without transferring networking facilities
permits Q-ware Systems to install access points (APs) on all city-owned public facilities
Up to now, 4600 APs are installed in an area of about 133.9 km2 , where 90% of the population resides
Trang 15WIFLY: Network Construction
Phase-1：(Sep.~Dec 2004)
30 MRT stations, malls, neighboring (150 m) areas (20% population coverage)
Phase-2: (Dec 2004~Dec 2005)
Core area of Taipei city (50%)
Phase-3： (Dec 2005~June 2006)
Phase-3： (Dec 2005~June 2006)
All other area in Taipei city (90% )
Trang 16WIFLY: Rate Options
Post-paid
399 NTD (~ 1319 ￥)/month
4,200 NTD (~ 13882￥)/year
Pre-paid
PC/NB (hot-spots)
PC/NB (hot-spots)
100 NTD (~331 ￥)/day
500 NTD (~1653 ￥)/month
300 NTD (~992 ￥)/360mins
PDA/SONY PSP (retail channels)
1800 NTD (~5950 ￥)/year
iPod touch (retail channels)
1200 NTD (~3967 ￥)/year
Trang 17WIFLY Transportation Services - I
Trang 18WIFLY Transportation Services - II
Trang 19 Multihop wireless network
R.Jain,“Wireless Mesh and Multi-Hop Relay Networks,” http://www.cse.wustl.edu/~jain/cse574-06/
R.B.Marks,etal.“IEEE 802 Tutorial:802.16 Mobile Multihop Relay,” IEEE 802.16mmr-06/006, March 2003
Multihop Relay,” IEEE 802.16mmr-06/006, March 2003
W.S.Conner,etal.“IEEE 802.11s TutorialOverview ofthe AmendmentorWireless LocalArea Mesh Networking,” IEEE 802.11s Tutorial, Nov 2007
M-Taipei:
http://english.taipei.gov.tw/TCG/index.jsp?recordid=8529
http://www.wifly.com.tw/wifly6/tw/AboutUs/AboutUsSub/
Trang 20Thank you! Thank you!