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TV White Spaces Operation Proposal

This proposal addresses technical issues related to TV White Spaces operation, focusing on scanning challenges, multi-band mode, and White Space Map elements. Various scanning methods, coverage differences, and channel access details are discussed to improve efficiency and reduce power consumption.

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TV White Spaces Operation Proposal

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  1. Amendment Proposal for TV White Spaces Operation Date: April 27, 2010 Authors:

  2. Introduction The technical issues raised in this proposal Scanning Issue Slide 2

  3. Scanning Number of scanning channels in TVWS The candidate channels are almost 30 (=180MHz/6MHz) when one channel bandwidth is 5 MHz Considering 10MHz/20MHz channel bandwidth, the number of channels that STA should scan are tripled (around 90). Large initial access delay of Passive Scanning Scanning time might be around 9,000ms i.e., 3 (Number of candidate bandwidth) x 30 (Number of candidate channels) x 100ms (Beacon Interval) Power consumption Power consumption depends on the number of scanning channels Submission Slide 3

  4. Scanning • Multi-band mode • STA can use other links and TVWS link as well as a control link to discover AP and get the TVWS MAP information • White Space Map specifies the channel list unoccupied by the primary users • They can be 802.11a/b/g/n/cellular link or TVWS link • TVWS MAP transmission • Within beacon frame • Within response frame requested by STA • Can be transmitted in 802.11a/b/g/n/cellular or TVWS link

  5. Scanning • Multi-band mode • - Seamless WLAN service

  6. Scanning • Multi-band mode • Coverage difference between other links and TVWS link • Due to carrier frequency characteristics • There are often coverage holes of 2.4GHz WLAN • Relative link budget difference is around 9~12dB (TVWS link vs. 2.4GHz link) • Due to System parameter

  7. Scanning Cold Start mode In a very initial state, or after certain elapsed time, in which STAs do not have TVWS channel information, STAs scan whole TVWS channels Or STAs get TVWS channel information from other than TVWS link Warm Start mode STAs scan TVWS channels from the last operation with available TVWS channel list, i.e. warm start mode STAs need not always scan whole TVWS channels STAs need not receive control information via 2.4GHz/5GHz link In a warm start mode, STA shall scan TVWS channels based on TVWS information received from AP during last operation

  8. Scanning • White Space Map Element • Transmission in TVWS is permitted only on channels that are indicated as available • The available channel list is referred to as a White Space Map (WSM) • Includes a list of identified available channels and corresponding maximum allowed transmission powers per available channel • A WSM is generated from database access and may be updated by measurement report

  9. Scanning • White Space Map Element • Transmission Interval • A MIB variable dot11TVWSMapPeriod is defined • WSM IE is included within at least one transmitted Beacon frame every dot11TVWSMapPeriod beacon interval • WSM valid time • A MIB variable dot11TVWSMapValidTime is defined • WSM IE is valid for a dot11TVWSMapValidTime from the TV bands database access time

  10. Scanning • White Space Map Announcement Frame • Whenever the available TV channel list has been updated • The enabling STA should transmit a correspondingly updated WSM announcement frame

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