March 2005 doc IEEE 802 11 050247 r

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March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Advantages of multiple channel

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Advantages of multiple channel usage in 11 s WLAN Mesh network Authors: Date: 2005 -Mar-17 Notice: This document has been prepared to assist IEEE 802. 11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802. 11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http: // ieee 802. org/guides/bylaws/sb-bylaws. pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard. " Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <stuart. kerry@philips. com> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802. 11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee. org>. Submission 1 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Abstract This presentation discusses

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Abstract This presentation discusses advantages on usage of multiple channels and requirements of channel setting technology for 11 s mesh network Submission 2 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Contents • • •

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Contents • • • Requirements Scenario for Single WLAN interface model Advantage on usage of Multiple channels Required technology for Multi WLAN interface model Suggestions for 11 s amendment Submission 3 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Requirements • Channel unification

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Requirements • Channel unification mechanism shall be defined to ensure the connectivity between Mesh APs – Single WLAN interface case and Single channel • Framework to build the optimization technology for Multi WLAN Interface network must be defined – Channel Setting Algorithm itself shall be out of scope – Framework must be defined • Measurement in multi hop network • TPC/DFS in multi hop network • 11 h/k extension for WLAN mesh network Submission 4 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Single WLAN Interface Case

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Single WLAN Interface Case Requirement of channel setting in mesh network Channel unification mechanism shall be standardized All MAPs shall use the same channel to establish mesh network even in such cases: – simultaneous power on Power on scan – merge of multiple mesh network Power on Submission 5 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Multiple WLAN Interface Case

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Multiple WLAN Interface Case Requirement of channel setting in mesh network Frameworks to support multiple WLAN interfaces shall be standardized –DFS, TPC, Measurement for mesh network –should be extension of 11 k and 11 h amendment for mesh network Multiple channel usage will be solutions to some issues on mesh networks – Load balancing – Qo. S Support – Hidden / Exposed terminal problem Submission 6 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 End-to-end throughput (Mbps) TCP

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 End-to-end throughput (Mbps) TCP Throughput degradation due to exposed terminal problem Case 1 1. 5 1. 0 Carrier Sense Range Case 2 0. 5 Case 1 TCP Throughput degradation due to exposed terminal problem Case 2 • Using different channel between the first and third hop recovers this degradation • How to select channel in more complicated case? Submission 7 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel for solving exposed terminal problem (1/7) • Mesh network example by 6 nodes M 5 M 1 M 3 M 4 M 6 M 2 Submission 8 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel for solving exposed terminal problem (2/7) • While nodes 1 and 2 are communicating… M 5 M 1 M 3 M 2 Submission Constraints to avoid exposed terminal problem L 12 – L 34 L 12 – L 45 L 12 – L 46 M 4 M 6 9 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel for solving exposed terminal problem (3/7) • While nodes 1 and 3 are communicating… M 5 M 1 M 3 M 2 Submission Constrains to avoid exposed terminal problem L 12 – L 34 L 12 – L 45 L 12 – L 46 L 13 – L 26 L 13 – L 46 L 13 – L 56 M 4 M 6 10 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel for solving exposed terminal problem (4/7) • Derivation of chromatic graph M 5 M 1 M 3 M 2 M 4 M 6 L 12 – L 34 L 12 – L 45 L 12 – L 46 L 13 – L 26 L 13 – L 46 L 13 – L 56 L 23 – L 15 L 23 – L 45 L 23 – L 56 L 45 – L 12 L 45 – L 23 L 45 – L 26 L 46 – L 12 L 46 – L 13 L 46 – L 15 L 56 – L 13 L 56 – L 23 L 56 – L 34 L 45 L 12 L 26 L 23 L 13 L 56 L 34 L 15 L 46 Constraints to avoid exposed terminal problem Submission 11 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel for solving exposed terminal problem (5/7) • All possible patterns in 5 -MAPs mesh network (21 patterns) Submission 12 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel for solving exposed terminal problem (6/7) • Number of required channels for all the possible topology (up to 8 MAPs) MAPs Channels 1 1 2 3 4 5 6 7 8 1 1 2 4 6 10 14 2 2 14 78 366 1599 1 24 468 8076 5 1421 853 11117 2 3 4 total Submission 1 1 2 6 21 13 112 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Usage of multiple channel for solving exposed terminal problem (7/7) • Required number of channels for practical topology (up to 10 MAPs) Submission 14 Atsushi Fujiwara

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Suggestions for 11 s

March 2005 doc. : IEEE 802. 11 -05/0247 r 1 Suggestions for 11 s amendment 11 s shall standardize: • Channel Unification mechanism to ensure the connectivity • Frameworks to support multiple WLAN interfaces – DFS, TPC, Measurement for mesh network – should be extension of 11 k and 11 h amendment for mesh network Submission 15 Atsushi Fujiwara