CONNECTIVITY FOR THE REST TO US CASE FOR TVWS

Transcription

1 CONNECTIVITY FOR THE REST TO US CASE FOR TVWS C3 Limited Postal Address: P.O. Box 31000, Blantyre 3, Malawi Physical Address: MPC Business Park, Chichiri

2 Table of Contents Introduction Overview Communication Technologies Used by ISP s in Malawi Television White Spaces Unique Benefits of Wi-FAR TABLE OFCONTENTS Coverage of Wi-FAR Radios Topologies and Configurations Point to MultiPoint Three Sector Point to MultiPoint Two Sector (Dual BTS) Wi-Fi Hotspot Use Case Network Relay (Layer 2) Channel Planning 15 Channel Re-Use Network Channel Planning 16 17

3 1 INTRODUCTION

4 Overview C3 is in the process of deploying a nationwide network in four phases. On completion, the network will comprise 88 core nodes with 1.24 Gbps, 80 Wi-FAR base stations with a total of 100 sectors and 30 Mbps per sector, 3,000 Wi-FAR client nodes and 15,000 Wi-Fi access points. Phase 1: Mtengo, Mpingwe Hill, Lirangwe, Govati, Ntcheu, Dedza, Lilongwe, Mponela, Kasungu, Jenda, Chikangawa, Mzuzu, Ekwendeni, Rumphi, Livingstonia, Chilumba, Karonga, Zomba, Mangochi, Nkopola, Monkey Bay, Salima, Benga, Nkhotakota, Dwangwa, Likoma, Nkhata Bay, Chileka, Mwanza, Balaka, Liwonde, Mimosa, Kapirinsundwe, Mchinji, Nchalo, Tengani, Mtakisi, Songwe Phase 2: Dowa, KIA, Blantyre, Chipata, Chisasu, Chitipa, Senga Bay, Mzimba, Ntchisi, Neno Phase 3: Milange (MZ), Luchenza, Madisi, Chipoka, Mua, Kasinje, Chiradzulu, Phalombe, Ngabu, Bangula, Zalewa, Malekano, Namwera, Mandimba (MZ), Chintheche, Nathenje, Bolero, Kapichira, Sandama Phase 4: Kanengo, Nkula, Nsanje, Marka, Chadzunda, Ntaja, Lizulu, Nkhoma, Nayuchi, Domasi, Embangweni, Mchenga, Chisenga, Chatoloma, Chisinga, Mtakataka, Katumbi, Malindi, Thekerani, Kayelekera PHASE 1 4 C3 NETWORK INFRASTRUCTURE BUILD

5 Communication Technologies used by ISPs in Malawi ISP Core network Distribution network Access network Airtel Microwave, fibre Microwave 2G, 3G, some 4G, Wi-Fi TNM Business Services Microwave, fibre Microwave 2G, 3G, some 4G, Wi-Fi MTL Microwave, fibre Microwave CDMA, WiMAX, Wi-Fi Access Microwave Microwave CDMA Skyband Microwave Microwave WiMAX, Wi-Fi Globe Microwave Microwave, fibre WiMAX, Wi-Fi Malswitch Microwave Microwave Microwave C3 Microwave Wi-FAR Wi-Fi MalawiNet None None None Datacom None Microwave Wi-Fi Computer Automation None Microwave Wi-Fi Teltech Microwave Microwave Wi-Fi COMMUNICATION TECHNOLOGIES USED BY ISP IN MALAWI

6 TELEVISION WHITE SPACES (TVWS)

7 Unique Benefits of Wi-Far Technology For its distribution network, C3 employs equipment that adheres to the international IEEE standard, also called Wi-FAR. Wi-FAR provides Point-to Multi-Point (PtMP) and Point-to-Point (PtP) Middle-Mile Broadband Wireless Access (BWA) for regional, rural and remote areas under Line of Sight (LoS) and Non Line of Sight (NLoS) conditions. The specification uses advanced spectrum sharing technology and ensures that no harmful interference is caused to the primary TV services in those bands.

8 Unique Benefits of Wi-Far Technology NLoS, PtMP and the capability to penetrate through walls and trees sets Wi-FAR technology apart from competing technologies using higher radio frequency bands. Wi-FAR adds cognitive radio technology to a simple and optimised time division duplex (TDD) orthogonal frequency division multiple access (OFDMA) waveform, similar to the OFDMA technology used in other broadband standards such as WiMAX and LTE. Each Wi-FAR cell provides up to 30 Mbps of aggregated throughput per 8 MHz channel using modulations ranging from 64QM, 16QAM to BPSK. Typical distances covered range from 10 km up to 30 km depending on topology.

9 Coverage of Wi-FAR radios 28 channels of 8 MHz are available in the RF band between 470 and 694 MHz. Most of them are not used for TV channels. 30 Mbps can be transmitted through a single 8 MHz channel, and C3 s Wi-FAR base stations will have 2-3 sectors of 2 x 8 MHz each. Thanks to the low radio frequency, coverage is much larger than with higher frequencies. Below is a comparison between coverage in 470 MHz versus 5 GHz. Coverage with 5 GHz ISM radios Coverage with 470 MHz Wi-FAR radios

10 TOPOLOGIES AND CONFIGURATIONS

11 TOPOLOGY Point to Multi-Point A A B B C C Non-LOS TVWS over the air link 20 to 35 Mbps per sector From 1 to 3 TVWS Base Stations TVWS CPE connects to an external Wifi router POINT TO MULTIPOINT 3 SECTOR CONFIGURATION

12 TOPOLOGY Point to Multi-Point A B C D A B C & D Single-port panel antenna Dual-port panel antenna Non-LOS TVWS over the air link 40 to 70 Mbps per sector POINT TO MULTIPOINT 2 RADIOS PER SECTOR CONFIGURATION TVWS CPE connects to an external Wifi router 2 TVWS Base Stations/SECTOR

13 Wi-Fi HOTSPOT USE CASE B A B C TVWS CPE Non-LOS TVWS over the air link ethernet Outdoor Wi-Fi AP A C Outdoor Wi-Fi AP available from leading Wi-Fi AP manufacturers can provide a Wi-Fi signal range of up to 200m in some instances 20 to 35 Mbps per sector TVWS CPE 3 x TVWS Base Station ethernet Outdoor Wi-Fi AP

14 RELAY NETWORK (LAYER 2 DISTRIBUTION) LAYER 2 DISTRIBUTION AND BASIC CONFIGURATION

15 CHANNEL PLANNING

16 CHANNEL RE-USE One UHF channel is used by each sector A UHF channel is re-used to prevent adjacent channel interference 3-Sector networks typically requires 9-15 unique channel re-use Channels are available in a typical US rural market Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8 Channel 9 Channel 10 Channel 11 Channel 12 UHF CHANNEL RE-USE TYPICAL 9-15 UNIQUE CHANNEL

17 {Available UHF Channels, Ch1, Ch2, Ch 3} {17: 3, 8, 13} {15: 4, 9, 14} {20: 2, 7, 12} {18: 1, 6, 11} {18: 5, 10, 15} {21: 5, 10, 15} {18: 1, 6, 11} {23: 4, 9, 14} {25: 3, 8, 13} {29: 2, 7, 12} {19: 4, 9, 14} {19: 1, 6, 11} Example shows 15 unique UHF channel re-use across 3 clusters Re-use shown prevents coverage overlap between any two sectors on same channel Depending upon the distance between adjacent sites, up to 15 unique UHF channels are required to enable a 3-sector grid like in this example UHF CHANNEL RE-USE EXAMPLE 3 CLUSTER CHANNEL RE-USE EXAMPLE

18 C3 TVWS COVERAGE PLAN (SNAP VIEW) CENTRAL AND PARTIAL NORTHERN REGION COVERAGE

19 THANK YOU C3 Limited Postal Address: P.O. Box 31000, Blantyre 3, Malawi Physical Address: MPC Business Park, Chichiri