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Coexistence in TV White Space

Coexistence in TV White Space. Authors:. Date: 2008-12-17. Abstract. There are likely to be multiple non-interoperable standards operating in the TV white space spectrum It is important to provide mechanisms to facilitate coexistence between these systems. Scope of Coexistence.

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Coexistence in TV White Space

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  1. Coexistence in TV White Space Authors: Date: 2008-12-17 Steve Shellhammer, Qualcomm

  2. Abstract • There are likely to be multiple non-interoperable standards operating in the TV white space spectrum • It is important to provide mechanisms to facilitate coexistence between these systems Steve Shellhammer, Qualcomm

  3. Scope of Coexistence • Two Network designed according to different standards • Network A • Network B • Scope of coexistence work • Coexistence between Network A and Network B • Not within scope of coexistence work • Coexistence between Network A and Incumbent systems • Coexistence between Network A and another Network A Steve Shellhammer, Qualcomm

  4. Categories of Coexistence Mechanisms • Non-cooperative • Each network attempts to maximize its performance • Examples: selection of channels with limited interference, spatial interference cancelation or beam forming, adaptive frequency hopping, etc. • Cooperative – Rules Based • Agree to follow a set of rules without having to exchange messages • Examples: listen-before-talk, divide up the spectrum a priori, transmit power control, etc. • Cooperative – Message Based • Negotiation of which channels to use • Negotiation on time domain sharing • Negotiation of transmit power control Steve Shellhammer, Qualcomm

  5. Working Group Cooperation • Non-cooperative techniques do not require WGs to agree on any network behavior – However, could limit coexistence • Rules-based techniques requires agreeing on network behavior but does not require interoperability • Message-based techniques provides the most flexibility but also requires a control channel between networks. Two options for control channel • Simple common PHY • Backhaul since all networks have Internet access and are location aware Steve Shellhammer, Qualcomm

  6. Adaptive (Cognitive) versus non-Adaptive Coexistence • A adaptive coexistence mechanism adapts its transmissions to enhance coexistence, based on its awareness to local spectrum activity • Adaptive frequency hopping in Bluetooth • Exponential back-off in 802.11 • A non-adaptive mechanism has fixed behavior • Divide up the spectrum a priori between fixed and portable • Adaptive is preferred • Full utilization of spectrum when Network A is the only network in the area • Sharing of spectrum when Network A and Network B are in a common area Steve Shellhammer, Qualcomm

  7. Cognitive Coexistence in TV White Space • Cognitive requires • Awareness • Adaptation • Methods of Awareness • Observe spectrum • Observe location • Observe location of other networks (control channel) • Adaptation parameters • Selection of channel • Bandwidth • Transmit power • Time of transmission • Modulation and coding rate Steve Shellhammer, Qualcomm

  8. Recommendations • Investigate • Methods of awareness (autonomous and control channel) • Methods of adaptation • Evaluate effectiveness of rules on network behavior • Rules for awareness • Rules for adaptation based on set of conditions Steve Shellhammer, Qualcomm

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