1. On the Objectives and Scope of the WS Coexistence PAR
July 2009
doc.: IEEE /xxxxr0
September 2009
On the Objectives and Scope of the WS Coexistence PAR
Date:
Authors:
Notice: This document has been prepared to assist IEEE 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.
Ari Ahtiainen, Nokia
Ari Ahtiainen, Nokia

2. July 2009
doc.: IEEE /xxxxr0
September 2009
Abstract
This presentation deals with the positioning, scope and objectives of the Coexistence PAR. Some comments and a text improvement on the scope and objectives of the PAR are provided.
Ari Ahtiainen, Nokia
Ari Ahtiainen, Nokia

3. Outline How to position Coexistence in 802
September 2009
Outline
How to position Coexistence in 802
Scope of the Coexistence PAR
Networks and Devices
Comments on some scoping aspects
Objectives of coexistence
Network Discovery
Communication
Spectrum Use Rules
Summary
Ari Ahtiainen, Nokia

4. Coexistence for WS Radios
September 2009
Coexistence for WS Radios
Multiple independent 802 stations using the coexistence support
802.x WS
SME
802.11 WS
802.22 WS
SME
SME
Coexistence Support
Ari Ahtiainen, Nokia

5. Networks and Devices Network – set of nodes, i.e. devices
September 2009
Networks and Devices
Network – set of nodes, i.e. devices
organized hierarchically with centralized decision making, e.g. a cellular RAN and an infrastructure BSS
organized without hierarchy with distributed decision making, e.g. IBSS and MBSS (802.11s)
Device
end user terminal or client device
may act as an autonomous node in a network
multiradio device may have association with multiple networks at the same time
=> device may participate into coexistence scheme also as an autonomous actor
Ari Ahtiainen, Nokia

6. Comments on PAR Scoping Aspects
September 2009
Comments on PAR Scoping Aspects
Coexistence between 802 radios or 802 and non-802 radios
Logical and physical control channels
Sensing with or without silence periods
Ari Ahtiainen, Nokia

7. September 2009
PAR Scope – 802 and non-802
Coexistence solution is primarily needed for dissimilar 802 radio technologies, such as the and the future WhiteSpace variants for .11 and .16
However, it is useful and will strengthen the IEEE position as a Standards Making Body to address also non-802 radio technologies, which may be developed either for the FCC regulated White Space frequencies or for White Space bands in other regulatory domains
=> both are needed
Ari Ahtiainen, Nokia

8. PAR Scope – Logical and Physical
September 2009
PAR Scope – Logical and Physical
Logical channel as a carrier of coexistence control info
can be a backhaul connection, such as wired Internet
can be another radio, such as Wide-Area Radio for Internet connectivity
Well-known issues (NAT, Firewalls) complicate end-to-end connectivity between TVWS networks and devices
Physical channel as a carrier of coexistence control info
dedicated narrowband control radio
requires regulation to allocate frequencies
=> both are needed
Ari Ahtiainen, Nokia

9. PAR Scope – Silence Periods
September 2009
PAR Scope – Silence Periods
Spectrum sensing without coordinated silence periods
how to distinguish between primary users (wireless microphones) and other secondary users
Spectrum sensing with coordinated silence periods
allows sharing of the sensing responsibilities between TVWS networks/devices
facilitates the detection of primary users
=> coordination is needed
Ari Ahtiainen, Nokia

10. Objectives of Coexistence Solution
September 2009
Objectives of Coexistence Solution
Discovery
Communication
Spectrum Use Rules
Ari Ahtiainen, Nokia

11. Objectives of Discovery
September 2009
Objectives of Discovery
Discovery of other secondary users
targeted to discover other secondary user WS networks with which coexistence is necessary
discovery mechanism may also significantly improve the efficiency of discovering other WS networks as potential communication partners
Text improvement proposal on PAR proposal:
“Discovery Process assists TVWS device to find networks and their operating parameters. This information is used for co-existence and can improve the initial network discovery. The co-existence mechanism can be used by the TVWS device to determine its own operating parameters as perceived by others, to establish it’s own network”
Ari Ahtiainen, Nokia

12. Objectives of Communication
September 2009
Objectives of Communication
To establish a common language about WS spectrum use among dissimilar networks and devices
Two-way communication is needed, examples:
collaborative spectrum sensing
two-way protocol on spectrum access contention
Ari Ahtiainen, Nokia

13. Objectives of Spectrum Use Rules
September 2009
Objectives of Spectrum Use Rules
To achieve rules on WS spectrum access, to provide a fair spectrum use etiquette
Such an etiquette builds on the discovery and communication described above
Ari Ahtiainen, Nokia

14. September 2009
Summary
Positioning of Coexistence specification w.r.t individual 802 radio specifications
Clarification of networks and devices as actors in the coexistence scheme
Some comments on the scoping of the Coexistence PAR
Text improvement on the objectives of Network Discovery
Ari Ahtiainen, Nokia