March 2015 doc IEEE 802 19 150021 r

March 2015 doc. : IEEE 802. 19 -15/0021 r 0 Discussion of LAA LBT Categories Date: 2015 -03 -11 Authors: Notice: This document has been prepared to assist IEEE 802. 19. 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. Submission Slide 1 Alireza Babaei, Cable. Labs

March 2015 doc. : IEEE 802. 19 -15/0021 r 0 Abstract • This document discusses a recent agreement within 3 GPP RAN 1 regarding LBT (Listen-Before-Talk) categories. • The purpose of this contribution is to highlight a question that can be asked of 3 GPP RAN in a liaison communication to clarify the purpose of the LBT categories. Submission Slide 2 Alireza Babaei, Cable. Labs

March 2015 doc. : IEEE 802. 19 -15/0021 r 0 RAN 1#80 Agreement Regarding LBT Categories (1 of 2) At RAN 1#80 in February 2015, the following agreement was made and documented in [1]: Classify the evaluated LBT schemes according to the following categories: – Category 1: No LBT – Category 2: LBT without random back-off – Category 3: LBT with random back-off with fixed size of contention window – Category 4: LBT with random back-off with variable size of contention window (continued) Submission Slide 3 Alireza Babaei, Cable. Labs

March 2015 doc. : IEEE 802. 19 -15/0021 r 0 RAN 1#80 Agreement Regarding LBT Categories (2 of 2) • Note: Contention window is the maximum possible random back-off value • Note: Category classification does not restrict a LBT design investigation • Note: Company is encouraged to evaluate many categories as much as possible • Illustrative examples – FBE procedure as defined in EN BRAN V 1. 8. 0 belongs to category 2 – LBE procedure with a fixed q for the contention window as defined in EN BRAN V 1. 8. 0 belongs to category 3 – LBE procedure Op A with a variable q for the contention window as defined in EN BRAN V 1. 8. 0 belongs to category 4 Submission Slide 4 Alireza Babaei, Cable. Labs

March 2015 doc. : IEEE 802. 19 -15/0021 r 0 LBT Mandatory for 3 GPP LAA (1 of 2) Presentation from 3 GPP [2] at IEEE 802 interim meeting in January 2015 included the following text on Slide 13: Agreed design targets: • Single global solution allowing compliance with any regional regulatory requirements • Effective and fair coexistence with Wi-Fi • Effective and fair coexistence among LAA networks deployed by different operators (continued) 5 Submission Slide 5 Alireza Babaei, Cable. Labs

March 2015 doc. : IEEE 802. 19 -15/0021 r 0 LBT Mandatory for 3 GPP LAA (2 of 2) Based on the above targets, it was agreed that at least the following functionalities are required for LAA: 1. Listen‐before‐talk (Clear channel assessment) 2. Discontinuous transmission on a carrier with limited maximum transmission duration 3. Dynamic Frequency Selection for radar avoidance in certain bands/regions 4. Carrier selection 5. Transmit Power Control Note: not all functionalities may have a spec impact; not all functionalities would be mandatory for all LAA e. NBs/UEs 6 Submission Slide 6 Alireza Babaei, Cable. Labs

March 2015 doc. : IEEE 802. 19 -15/0021 r 0 Clarification/Explanation Needed • Given that LBT is considered to be required for 3 GPP LAA, clarification/explanation is needed regarding the purpose and intent of Category 1 of the LBT schemes. • A request of clarification/explanation can be done via a liaison communication from IEEE 802 to 3 GPP RAN and 3 GPP RAN 1. • IEEE 802 consensus is that LBT is essential to a global LAA solution – IEEE 802 previously sent 3 GPP liaison communication [3] that included the recommendation to evaluate alternatives to the fixed back-off mechanism in LBT (i. e. , contention window size not fixed). Submission Slide 7 Alireza Babaei, Cable. Labs

March 2015 doc. : IEEE 802. 19 -15/0021 r 0 References [1] RP-150271, “Status Report to TSG: Study on Licensed -Assisted Access to Unlicensed Spectrum, ” 3 GPP RAN #67, March 2015 [2] IEEE 802. 19 -15/0008 r 0, “ 3 GPP & unlicensed spectrum, ” Chairman of 3 GPP TSG-RAN, IEEE 802 Interim Session, Jan 11 -16, 2015 [3] Liaison to 3 GPP TSG RAN, Statement Regarding Coexistence of Licensed Assisted Access (LAA) and IEEE 802 (02 -Feb-15) Submission Slide 8 Alireza Babaei, Cable. Labs