Considerations for Wireless SCB Document Number: IEEE 802.16-13-0004-00-000r Date Submitted: 2013-01-09 Source: Yung-Han Chen, Jiann-Ching Guey, Jen-Shun.

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Considerations for Wireless SCB Document Number: IEEE r Date Submitted: Source: Yung-Han Chen, Jiann-Ching Guey, Jen-Shun Yang, Ching-Tarng Hsieh, ITRI. Re: Call for Contributions: IEEE Std Amendment for Small Cell Backhaul (SCB) Applications (IEEE Gdoc) Base Contribution: None. Purpose: Deployment contributions of wireless small cell backhaul for discussion Notice: This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Copyright Policy: The contributor is familiar with the IEEE-SA Copyright Policy Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

SCB Deployment Considerations Factors to consider in different deployment scenarios – Carrier frequency Identify potential frequency bands below 6GHz Propagation characteristics of identified bands – Range/coverage area – Indoor/outdoor; antenna elevation Step1: Initial assessment of system performance for each scenario – Channel statistics/characteristics – Per link peak rate – System throughput Step 2: Requirement – Antenna configuration – Transmission technology – Receiver technology Iterate a few times between step 1 and step 2 backhaul band access band backhaul bandaccess band vs System throughput should match total traffic generated by all access nodes

P2MP GPON Design Reference A (very challenging) design reference for point to multi-point wireless backhaul Gbps downstream Gbps upstream – Aggregated at Optical Line Terminal (OLT) – Shared in time by 8, 16, 32 or 64 Optical Network Terminals (ONT) act to be Feeder Nodes Metro 12n 12n 1 2 n Upstream (US) - TDMA Downstream (DS) - TDM ONT #1 ONT #2 ONT #n 1:N split (N=8,16,32,64) Remote Node (RN) DropFeeder (Trunk) OLT 1:N1:N Feeder Node 1 Feeder Node 2 Small Cells Replaced by IEEE GPON reference architecture

Considerations of Capacity Requirements Use cases – Point-to-point – Point-to-multiple-point What is the max. number of multiple points the standard can support? Min. and Max. DL/UL throughout per link – TDD DL & UL symmetric or asymmetric? – As a backhaul application, should it guarantee Min. bandwidth and Max. latency? Example – Max. DL/UL throughput per link: 10Mbps/10Mbps Depends on operational requirements such as coverage and services – Max. number of multiple points: 4 A master feeder needs to handle 4 slaves’ DL/UL links, so the total throughput required by the master feeder is no less than 40Mbps/40Mbps – Configure PHY/MAC profiles of the master feeder to support the required total throughput Bandwidth to use MCS Number of streams (MIMO) BW request and QoS strategies Others… 4

Issues of Multiple Hops Issue 1: based on the existed IEEE TDD architecture, a middle hop should support Tx and Rx simultaneously – For example, if Site B is a client of Site A, and Site C is a client of Site B, then Site B needs to enable Tx mode (UL to Site A) and Rx mode (UL from Site C) Issue 2: the site that is closer to the feeder might be the bottleneck – For example, Site A (closer to the feeder) needs to handle the traffic of Site A, Site B and Site C Issue3: more hops, longer latency – For example, Site C will suffer longer latency The frame structure of protocol might be re-defined to solve these issues. 5 Bottleneck Latency Small cell BS Site A Site B Site C