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Doc.: IEEE 802.19-16/0098r0 Submission May 2016 Hyunduk Kang et al, ETRISlide 1 A Coexistence Discovery Mechanism Date: 2016-05-18 Authors:

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Presentation on theme: "Doc.: IEEE 802.19-16/0098r0 Submission May 2016 Hyunduk Kang et al, ETRISlide 1 A Coexistence Discovery Mechanism Date: 2016-05-18 Authors:"— Presentation transcript:

1 doc.: IEEE 802.19-16/0098r0 Submission May 2016 Hyunduk Kang et al, ETRISlide 1 A Coexistence Discovery Mechanism Date: 2016-05-18 Authors:

2 doc.: IEEE 802.19-16/0098r0 Submission Interference vs. Coexistence discovery Interference among wireless systems is caused by wireless systems located nearby each other A first step on interference mitigation might be which wireless systems are interfering me on which channel –Interference on the same operating channel –Interference on the adjacent channel (due to partial channel overlap) Coexistence discovery let you know –Who is your neighbor that can cause co-channel or adjacent channel interference –What is further information regarding your neighbors such as network type, operating parameters, and so on. May 2016 Hyunduk Kang et al, ETRISlide 2

3 doc.: IEEE 802.19-16/0098r0 Submission Hidden neighbors May 2016 Hyunduk Kang et al, ETRISlide 3 AP1 and AP2 directly can NOT hear each other Hidden neighbors cause more severe interference each other since they are blinded each other

4 doc.: IEEE 802.19-16/0098r0 Submission Hidden neighbor discovery with geo- location information Geo-location information not always provide hidden neighbor information because of the followings; –Only in some conditions (e.g., outdoors with clear line of site to GPS), accurate geo-location information is achievable –Other conditions, particularly indoors, it may be more challenging To increase the accuracy of hidden neighbor discovery, we can make good use of results of spectrum sensing (or radio measurement) by each wireless systems May 2016 Hyunduk Kang et al, ETRISlide 4

5 doc.: IEEE 802.19-16/0098r0 Submission Example of hidden node situation May 2016 Hyunduk Kang, et al, ETRISlide 5 AP1 has hidden neighbors, AP2 and AP3 AP2 has a hidden neighbor, AP1 AP3 has a hidden neighbor, AP1

6 doc.: IEEE 802.19-16/0098r0 Submission How to discover hidden neighbors (1/3) May 2016 Hyunduk Kang, et al, ETRISlide 6 After channel scanning and association –Each AP and STA discovers AP1: no AP AP2: AP3 AP3: AP2 STA11: AP1 STA21: AP2 STA31: AP1, AP2, AP3 STA32: AP2, AP3 STA33: AP3

7 doc.: IEEE 802.19-16/0098r0 Submission How to discover hidden neighbors (2/3) May 2016 Hyunduk Kang, et al, ETRISlide 7 STA31 located in overlapped area of three APs’ coverage can sense all APs AP3 knows the existence of hidden AP1 based on the result of channel scanning of the associated STA31 There exist two blinded APs –AP1 should know the existence of hidden AP2 and AP3 –AP2 should know the existence of hidden AP1 AP3 can spread hidden neighbor information to the neighbors still blinded

8 doc.: IEEE 802.19-16/0098r0 Submission How to discover hidden neighbors (3/3) May 2016 Hyunduk Kang, et al, ETRISlide 8 Spreading hidden neighbor information to the neighbors

9 doc.: IEEE 802.19-16/0098r0 Submission A proposed hidden neighbor discovery mechanism (1/3) May 2016 Hyunduk Kang, et al, ETRISlide 9 Discovery mechanism includes the following steps; –Each AP and STA perform channel scanning –Each STA associates its selected AP –Each STA sends channel scanning information to the associated AP –Each AP discover hidden APs and updates neighbor AP lists by comparing the followings; Channel scanning by itself Channel scanning information to the associated STAs –If hidden APs are exist, the AP selects one or more STA among its associated STAs

10 doc.: IEEE 802.19-16/0098r0 Submission A proposed hidden neighbor discovery mechanism (2/3) May 2016 Hyunduk Kang, et al, ETRISlide 10 Discovery mechanism includes the following steps (cont.); –The AP sends APDiscovery_indication message to the selected STA(s) APDiscovery_indication message may include channel scanning information of the selected STA(s) and neighbor information regarding the associated AP of the selected STA(s) –The selected STA(s) received APDiscovery_indication message from its associated AP, send APDiscovery_indication message to neighbor APs discovered by the selected STA(s) based on channel scanning –Neighbor AP(s) received APDiscovery_indication message, recognize existence of hidden AP(s) and update neighbor AP lists

11 doc.: IEEE 802.19-16/0098r0 Submission A proposed hidden neighbor discovery mechanism (3/3) May 2016 Hyunduk Kang, et al, ETRISlide 11 Message exchange among APs and STAs

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