Optical Wireless Convergence. Tod Sizer, Director Broadband and Wireless Access Network Research Bell Laboratories
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1 Optical Wireless Convergence Tod Sizer, Director Broadband and Wireless Access Network Research Bell Laboratories
2 A Challenge f RF f RF Location A RF Waveguides Coaxial Cable Optical Fiber Location B
3 A Challenge [2] f RF f RF Location A Location B RF Waveguides Coaxial Cable Optical Fiber All point to point technologies Largely proprietary (unique) format for transmission Unique end point devices higher costs
4 A Challenge [3] Our approach f RF f RF Digitize Packetize Ethernet Internet(?) Depacketize synchronization Analog Location A Standard Ethernet 100BaseT GigE copper GigE fiber Managed fiber Location B
5 Radio Digitizing Technique Base Station Interface Base Station Mix Radio Signal To Baseband Digitize Radio Signal Packetize digitized Radio Signal Ethernet Network Remote Radio Head Depacket digitized Radio Signal Digital Analog Conversion Mix Radio Signal To RF Synchronization
6 Cellular Signal Distribution Scheme BSI Downlink sector α Downlink sector β Uplink sector α Gigabit Ethernet Switch + Summing Node Sector β Sector α Uplink sector β
7 Cellular Signal Distribution Scheme BSI Downlink sector α Gigabit Ethernet Switch Sector β Downlink sector β Uplink sector α Uplink sector β Sector α
8 Cellular over Gigabit Ethernet w/ PoE BTS with BSI CAT5 Cables Equipment Closet w/ PoE Gigabit Ethernet Switch Digitized CDMA/UMTS/GSM RF signal is distributed inbuilding through switched Gigabit Ethernet packet data network using LAN CAT5/fiber cables (potentially existing). Same system can transport CDMA 1X, EV-DO, or UMTS signals. Interface to BTS through baseband I/Q or RF radio input and output. (no modification of BTS required) Remote Radio Heads (s) based on handset technology and powered over CAT5 cable radiate downlink signal and receives uplink signal.
9 Macrocellular distribution Radio distribution for outdoor macrocells and hot spots [Hoteling] AMP Shared Sector 2 ~ 3km 2 ~ 3km GigE Switch BSI GigE Fiber, EPON, Managed fiber, etc. 2 ~ 3km 1x DO BTS BTS 2 ~ 3km 2 ~ 3km
10 Scalable Network Sector α Sector α Sector β BSI a GES GES BSI ß Sector β GES GES BSI: base station interface GES: gigabit Ethernet switch : remote radio Head : access point
11 Direct BTS Driven Application Base Station BSI A BTS or at least one sector of a BTS is dedicated to driving the network for either in-building coverage or hoteling of BTS s The BTS interface would be RF initially, but can be digital CPRI or built into BTS. Delay in downlink can be compensated by timing advancement in BTS Off-the-shelf GigE switches can be used in the network
12 RF Repeater Application BSI Signals received over the air for re-broadcasting over desired coverage area Requires very small delay to avoid upsetting air-interface (standard calls for < 5 us)
13 Conclusion Market Opportunity The In-building market for wireless coverage is growing and with easy to install and cost effective solutions such as we have presented here will accelerate. Hoteling for macrocellular coverage has clear advantages which can be enabled with this technology Key advantages to this approach Take advantage of Gigabit ethernet equipments, components and CAT5/fiber medium Software sectorization for capacity management and growth Intelligent management of reverse-link for interference protection Transport RF bandwidth: air-interface agnostic and future proof.
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