COEXISTENCE OF MULTIPLE SECONDARY NETWORKS IN TVWS (DISTRIBUTED BEACON APPROACH)

Transcription

1 COEXISTENCE OF MULTIPLE SECONDARY NETWORKS IN TVWS (DISTRIBUTED BEACON APPROACH) Authors: Date: Name Company Address Phone Gabriel Porto Villardi NICT 3-4 Hikarino-oka, Yokosuka, Japan Yohannes Alemseged NICT 3-4 Hikarino-oka, Yokosuka, Japan Chen Sun NICT 3-4 Hikarino-oka, Yokosuka, Japan Tran Ha Nguyen NICT 3-4 Hikarino-oka, Yokosuka, Japan Tuncer Baykas NICT 3-4 Hikarino-oka, Yokosuka, Japan Hiroshi Harada NICT 3-4 Hikarino-oka, Yokosuka, Japan Notice: This document has been prepared to assist IEEE 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. Slide 1

2 DISTRIBUTED BEACONS PURPOSE The main purpose of TVWS through distributed beacons approach is to allow harmless coexistence between secondary networks while offering an alternative to the method utilizing Discovery and Information Server. The distributed nature of the approach enables structureless beacon implementation. Neither infra-structured beacon networks nor beacon operators are necessary. Slide 2

3 COEXISTENCE SCENARIO 1 - HOMOGENEOUS GPS time & Location TVWS Database LAN 4 (Ch. Z) LAN 1 (Ch. X) CHE 1 dep. 1b TV Base Station Internet CHE 4 dep. 4b dep. 1a dep.4a dep. 2b dep. 3a CHE 2 dep. 2a CHE 3 LAN 2 (no utilization) LAN 3 (Ch. Y) dep. 3b Slide 3

4 HOMOGENEOUS NETWORKS PROCEDURE FOR COEXISTENCE BETWEEN CHES: 1. The initiating CHE check its geo-location and its time through GPS. 2. The initiating CHE access the TVWS database to get a list of available channel(s) in its location. 3. Upon availability of TV channel(s), the initiating CHE identify the broadcast channel. 4. During the coexistence window, the initiating CHE receives beacons from already established CHEs, which are likely to be in its interference range, with specific information regarding geo-location, spectrum utilization, Tx power, QoS and etc. 5. The initiating CHE makes a coexistence decision in autonomous manner regarding which TV channel to access (out of a subset of unoccupied channels) and how to access it. 6. The initiating CHE broadcasts its updated channel utilization (i.e, time, frequency, code). 7. The initiating CHE informs its dependent stations which TV channel they should utilize for communication. 8. The dependent stations start communication during the communications window. Slide 4

5 SOME PRE-DEFINED RULES TO ALL SCENARIOS To identify the broadcast channel, search for the beacon from the lowest to the highest frequency TV channel. If there is no broadcast channel (or no beacon could be found in the set of available channels), it should be selected as the lowest frequency available TV channel. If more than one broadcast channel is identified, selects the one which has beacons of CHEs in closer geographical location. The coexistence window starts every x seconds (GPS time) and lasts for α seconds. Randomly, selects its beacons Tx time within the coexistence window or utilize fixed time-slots TX for established CHEs with empty time-slots for new comers. The coexistence window should have a length that yields a predetermined low beacon collision rate, i.e., 3 CHEs -> x seconds; 4 CHEs -> y seconds). Dependent stations should listen for the enabling message containing their network ID in order to get information on which channel to access and how to access it. Slide 5

6 FLOW CHART - HOMOGENEOUS NETWORKS Slide 6

7 COEXISTENCE SCENARIO 2 - HETEROGENEOUS (A) GPS time & Location TVWS Database TV Base Station LAN 3 (Ch. Z) LAN 1 (Ch. X) LAN 2 (Ch. Y) dep. 3b dep. 3a CHE 3 dep. 1a CHE 1 dep. 1b CHE 2 dep. 2a Internet Slide 7

8 HETEROGENEOUS NETWORKS (A) * CHE is a dual-radio device PROCEDURE FOR COEXISTENCE BETWEEN DUAL-BAND CHES: 1. The initiating CHE check its geo-location and its time through GPS. 2. The initiating CHE access the TVWS database to get a list of available channel(s) in its location. 3. Upon availability of TV channel(s), the initiating CHE switches to the common RAT to identify the broadcast channel. 4. During the coexistence window, the initiating CHE receives beacons from already established CHEs, which are likely to be in its interference range, with specific information regarding geo-location, spectrum utilization, Tx power, QoS and etc. 5. The initiating CHE makes an autonomous coexistence decision regarding which TV channel to access (out of a subset of unoccupied channels). 6. The initiating CHE broadcasts its updated channel utilization (i.e, time, frequency, code). 7. The initiating CHE informs its dependent stations on which TV channel they should utilize for communications. 8. The dependent stations start communication during the communications window. Slide 8

9 FLOW CHART - HETEROGENEOUS NETWORKS (A) Slide 9

10 COEXISTENCE SCENARIO 2 - HETEROGENEOUS (B) GPS time & Location RAN 1 (Ch.A) TVWS Database TV Base Station dep. 1a LAN 3 (Ch. Z) LAN 1 (Ch. X) LAN 2 (Ch. Y) RAN Base Station dep. 3b dep. 3a CHE 3 dep. 1a CHE 1 dep. 1b CHE 2 dep. 1c dep. 2a Internet dep. 1b Slide 10

11 HETEROGENEOUS NETWORKS (B) * CHE is a dual-radio device * Wide coverage area network base stations need not be dual-band PROCEDURE FOR COEXISTENCE BETWEEN DUAL-BAND CHES AND BASE STATIONS: 1. The initiating CHE check its geo-location and its time through GPS. 2. The initiating CHE access the TVWS database to get a list of available channel(s) in its location. 3. Upon availability of TV channel(s), the initiating CHE switches to the common RAT to identify the broadcast channel. 4. During the coexistence window, the initiating CHE receives beacons from already established CHEs, which are likely to be in its interference range, with specific information regarding geo-location, spectrum utilization, Tx power, QoS and etc. 5. The initiating CHE makes a preliminary autonomous coexistence decision regarding which TV channel to access (out of a subset of unoccupied channels). 6. The initiating CHE broadcast a beacon in this channel requesting any device from the wide range dissimilar network to report its presence through beacon (IP address, Tx power, required QoS and etc). Received beacons are considered to be in interference range. 7. Initiation CHE makes a final autonomous decision on which channel to access and how to access it. 8. The initiating CHE informs its dependent stations on which TV channel they should utilize for communications. 9. The dependent stations start communication during the communications window. Slide 11

12 FLOW CHART - HETEROGENEOUS NETWORKS (B) Slide 12

13 Distributed - Autonomous SYSTEM ARCHITECTURE Scope Interface C Discovery and Information Server Interface B2 TVWS Database Interface C Manager Interface B3 Manager Operator Management Entity Interface D Enabler Interface B1 TVBD Network or Device Interface A Slide 13

14 SYSTEM ARCHITECTURE TVWS Database Interface C Manager Interface B1 Interface B3 (to other CHEs) Manager Interface B1 CHE Enabler CHE n Enabler Interface A Interface A TVBD TVBD TVBD Network wireless channel TVBD Dependent Station Slide 14

15 BEACON STRUCTURE & BROADCAST CH. ACCESS RAT ID Geolocation Spectrum Utilization TX Power Interference Tx Time QoS... Tolerance Communication Window (Dependent Station Transmission) Window (Beacons Broadcast) Communication Window (Dependent Station transmission) Slide 15

16 THANK YOU FOR YOUR ATTENTION! QUESTIONS?