Amendment Proposal for TV White Spaces Operation Month Year doc.: IEEE 802.11-yy/xxxxr0 Amendment Proposal for TV White Spaces Operation Date: April 13, 2010 Authors: Name Company Address Phone email Eunsun Kim LG Electronics Mobile Comm. Lab, LG R&D Complex 533, Hogye1, Dongan, Anyang, Korea 82-31-450-1860 esun.kim@lge.com Yongho Seok Mobile Comm. Lab, LG R&D Complex 533, Hogye1, Dongan, Anyang , Korea 82-31-450-1947 yongho.seok@lge.com Soonjoon Park 82-31-450-7129 soonjoon.park@lge.com John Doe, Some Company

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

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

Accelerate Contribution November 2009 Accelerate Contribution 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 LG Electronics, Inc.

Accelerate Contribution November 2009 Accelerate Contribution 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 TVWS 2.4GHz link Channel bandwidth 5MHz 20MHz Guard Interval 3.2us 0.8us Maximum transmission power 100mW Relative Power Spectral density 1 0.25 LG Electronics, Inc.

Accelerate Contribution November 2009 Accelerate Contribution Scanning Multi-band mode - Seamless WLAN service LG Electronics, Inc.

Scanning Cold Start mode Warm 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

Scanning White space map within Beacon Frame White space map is provided by beacon frame White Space Map specifies the channel list unoccupied by the primary users Once STA listens to beacon frame, STA doesn’t need to scan channels occupied by incumbent users By skipping the channels occupied by incumbent users , initial access delay and power consumption problem can be resolved a little. However, it can be some overhead for beacon frame. Submission Slide 8

Accelerate Contribution November 2009 Accelerate Contribution Scanning White space map within Response Frame AP provides White Space Map information to STA for reducing the scanning overhead White Space Map is transmitted within Response Frame Response frame can be probe response frame LG Electronics, Inc.

Normative Text Summary November 2009 Accelerate Contribution Normative Text Summary Introducing White Space Map Provide a list of identified available channels and its maximum allowed transmission power STAs should scan the identified available channels based on the WSM APs and STAs should generate WSM based on TV channel information from TV bands database or its own spectrum sensing  LG Electronics, Inc.

Normative Text Summary November 2009 Accelerate Contribution Normative Text Summary Introducing Multi-band IE Assume that an AP and STAs have multiple radios for different bands Provides AP’s operating channel numbers and its corresponding regulatory classes STAs receiving Multi-band Operation element are able to discover the AP operating in different bands without channel switches LG Electronics, Inc.