Next Gen RAN Using TVWS And

Radio Spectrum Facts • Medium for wireless communications • Segments of frequencies for carrying information • Communicating devices tune to the same frequency segment • Signals occupying the same frequency simultaneously create mutual interference freq ASTRI Proprietary “Spectrum is the blood of the mobile and wireless industry. But unfortunately spectrum is a limited and scarce resource that requires careful global, regional and national planning and regulation.” - Next Generation Mobile Networks (NGMN) Alliance† † NGMN is a mobile telecommunications association of mobile ASTRI Proprietary operators, vendors, manufacturers and research institutes. Conventional Spectrum Regulatory Policies TV Broadcasting licensed band Cellular Communications licensed band Wi-Fi unlicensed band ASTRI Proprietary Ex: Spectrum Allocation in HK • TV Broadcasting • > 300 MHz spectrum is allocated • Min. ~ 70MHz is required to provide service at a given area • Wi-Fi • > 450MHz can be used for 5GHz Wi-Fi • Up to 160MHz is used at a given place and time • Cellular Communications • ~ 600 MHz spectrum is allocated and fully utilized ASTRI Proprietary Towards more efficient spectrum utilization … TV Broadcasting licensed band Cellular Communications licensed band Wi-Fi unlicensed band ASTRI Proprietary Next Generation Radio Access Network Based on Dynamic Spectrum Access: TVWS and LAA Eddy CHIU Manager, Communications Technologies Division March 2016 ASTRI Proprietary Moving Towards 5G: The Need for More Spectrum More spectrum to support higher 移動寬帶 throughput More spectrum to support many devices / connections 大規模機器通信高可靠低時延通信 ASTRI Proprietary 7 Moving Towards 5G: The Need for More Spectrum More spectrum to support higher 移動寬帶 throughput 푁푘 푛 User 푘 data rate = 퐵푘 log2 1 + 훾푘 푛=1 More spectrum to 퐵푘 ↑, User 푘 data rate ↑ support many devices / connections 퐵푘 : Spectrum allocated to User 푘 푁푘 : Number of channels used by User 푘 푛 th 훾푘 : Signal−to−noise ratio of User 푘 on the 푛 channel 大規模機器通信高可靠低時延通信 ASTRI Proprietary 8 4G Networks vs. 5G Networks: Dynamic Spectrum Access Macrocell 4G Networks base station Small cell • Make use of licensed base station spectrum only Terminal • Optimized for particular deployment scenario Licensed Non-cellular Spectrum Sharing Vision for 5G Networks • Licensed non-cellular spectrum sharing based on geographical area • Free unlicensed spectrum sharing based on run-time sensing Free Unlicensed Spectrum Sharing ASTRI Proprietary 9 Wi-Fi devices Licensed Shared Access (LSA) Goal • Allow spectrum that has been licensed to be used by more than one entity Challenge • Does not cause harmful interference to incumbent user Ex: Licensed and unlicensed use of the 3.5 GHz band in US • 3 tier approach (lower tiers are protected from higher tiers) • Tier 1: Incumbents e.g., Navy, fixed-satellite service Earth Stations • Tier 2: Protected Access • Tier 3: General Authorized Access • The migration from exclusive use to spectrum sharing presents new opportunities e.g., small operators, ad-hoc deployments, etc. ASTRI Proprietary 10 LSA Use Case: TV White Space (TVWS) • Analog TV broadcast uses multi-frequency network (MFN) to avoid ghosting • Broadcast stations use same frequency • Different transmission delays cause ghosting • Broadcast stations use different frequencies • Different transmission delays does not matter • Receiver is tuned to best frequency ASTRI Proprietary 11 LSA Use Case: TVWS in Hong Kong • HK TV is broadcast using UHF band (470-862MHz) channel 21-69 • TVWS is under-utilized TV spectrum in a geographical area due to analog TV multi-frequency network deployment • Example: Castle Peak • TV channels 34, 38, 42, 44, 43, 35, 37 are used • TV channels 36, 39, 40, 41 are not used Hong Kong Analog TV Tower Locations 22.55 Primary 22.5 Channels (8MHz each) Broadcast Stations 22.45 Different transmit frequencies create TVWS Temple Hill 21, 25, 23, 27, 22, 35, 37 22.4 Castle Peak 34, 38, 42, 44, 43, 35, 37 Latitude 22.35 Kowloon Peak 34, 38, 42, 44, 32, 35, 37 22.3 Golden Hill 33, 39, 43, 45, 40, 35, 37 TV channel utilization near Castle peak 22.25 Occupied Channels Cloudy Hill 49, 51, 53, 55, 30, 35, 37 22.2 Lamma Island 49, 51, 53, 55, 30, 35, 37 113.85 113.9 113.95 114 114.05 114.1 114.15 114.2 114.25 114.3 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 Longitude Possible White Spaces ASTRI Proprietary 12 LSA Use Case: ASTRI’s TVWS Solutions Simulation platform for discovering available spectrum Simulated number of white space channels in HK based on the Irregular Terrain Model (ITM) Many Available TVWS simulation in HK white space • Many white space channels channels in rural areas • Verified with field measurements Few LTE small cells with self-organizing network (SON) capabilities • Commercial grade TD-LTE equipment with advanced co-channel signal detection and channel selection capabilities Self-configuring network ASTRI Proprietary 13 Vision: Smart City over TVWS Dedicated LTE network Unaffected for vertical applications TV broadcast LTE SON small cells Core providing controlled Network coverage Utility meters Security panel Street Parking meter & light Vending space sensor machines ASTRI Proprietary 14 Licensed-assisted Access to Unlicensed Spectrum (LAA) Background • 3GPP has been defining the technology standard for cellular communication over unlicensed spectrum • For fair co-existence with Wi-Fi, need to match Wi-Fi channel access scheme Wi-Fi Channel Access scheme 1. Listen before talk (LBT) 2. If channel is occupied, wait a random time and try again ASTRI Proprietary 15 LAA: State-of-the-art • Currently, being standardized for LTE-Advanced Pro • Downlink specifications finalized • Uplink specifications expected to be finalized within 2016 • Based on carrier-aggregation framework • Licensed band, Primary Cell (PCell) is used for carrying critical information (e.g., control signaling) • Unlicensed band, Secondary Cell (SCell) is used for data offloading PCell Wi-Fi device SCell Licensed band access LTE PCell … Small cell Licensed band time access LTE PCell … Unlicensed band Wi-Fi devices access time Wi-Fi LTE SCell Wi-Fi LTE SCell … ASTRI’s LAA R&D time 1. Robust uplink LAA LBT, e.g., mitigate multi-cell / multi-user false alarm 2. Fast uplink LBT ASTRI Proprietary 16 Summary Next generation network with require more spectrum • Higher throughput for enhanced mobile broadband • More connections for applications such as smart city Dynamic spectrum access schemes • Primitive solutions exist now for 4G • Expect to be a defining feature of 5G configurable infrastructures ASTRI’s research focus • Self-organizing and interference-aware infrastructure equipment for LSA / TVWS deployment • Essential algorithms for LAA • New technology trials ASTRI Proprietary 17 End of Presentation Thank you. Questions are welcome. Corporate website: www.astri.org Contact: Eddy CHIU [email protected] +852-6406-9335 ASTRI Proprietary 18 Disclaimer The information contained in this presentation is intended solely for your reference and may be subject to change without further notice. Such information's truthfulness, accuracy or completeness is not guaranteed and it may not contain all the material information concerning Hong Kong Applied Science and Technology Research Institute Company Limited and/or its affiliates (collectively, "ASTRI"). ASTRI makes no representation or warranty regarding, and assumes no responsibility or liability for, the truthfulness, accuracy or completeness of any information contained herein. In addition, the information may contain projections and forward-looking statements that may reflect ASTRI’s current views with respect to future events and financial performance. These views are based on current assumptions which may change over time. ASTRI makes no assurance that such future events will occur, that such projections will be achieved, or that ASTRI’s assumptions are correct. Lastly, this presentation does not constitute an offer made by ASTRI whatsoever (including an offer relating to ASTRI's technologies and/or services). 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