Hetergeneous Networks HETNET IMPROVE DENSIFY ADD

Hetergeneous Networks HETNET IMPROVE DENSIFY ADD

Why and what HetNet is About End User Experience Coverage Coverage is taken for granted But is bitrate dependent Capacity Data and voice volume capacity to serve all subscribers Speed and low latency Always on Cell edge performance user experience Signaling Capacity everywhere HetNet Public 2012-03-23 Page 2

Device impact Network Requirement Dongles Today Tomorrow Peakrates: 20-80 Mbps Expectation: 10/2 Mbps Volume: 1, 3, 5, 10 GB/month Tablets Peakrates: 20-40 Mbps Demand Peakrates: 100 Mbps Expectation: 20/5 Mbps Volume: 30 GB/month Expectation : 5/1 Mbps Volume: 2 GB/month Smartphones Peakrates: 14-21 Mbps Expectation : 2/0.5 Mbps Volumes: 500 MB/month HetNet Public 2012-03-23 Page 3 Despite the growth in data volumes subscriber demands on bitrate may be the big driver for network evolution!

Network Challenges Data Volume Growth Cell Edge Performance ~10kbps (voice) =>10Mbps defining coverage Not easy to make cell split in dense urban areas Expansion of sites with more antennas may cause protests Not possible to maintain regular cell grid in dense areas Less people for operating larger networks Limited investment budget Site expansion plans are often stopped by restrictions on making changes to touristic or historical areas or by a rapidly changing environment with new buildings affecting cell plans. HetNet Public 2012-03-23 Page 4

Hetnet strategy Improve Required Capacity Current Capacity Densify Add HetNet Public 2012-03-23 Page 5

The Radio Network Toolbox Data rate 1 3 2 3 2 Super-macro Super-macro HetNet Public 2012-03-23 Page 6 Micro, Pico, Relays 1. Improve: Super Macro advanced antennas, spectrum aggregation, advanced Rx 2. Densify: More Cells Site densification, Small cells main remote, relays, pico 3. Add: Dedicated indoor/enterprise solutions as part of mobile operator offering

Maximize the added value High Macro SIR Low Macro SIR Small added value: - Low offload per user - Similar bit rates - Small coverage area High added value: - High offload per user - Higher bit rates - Large coverage area HetNet Public 2012-03-23 Page 7

Adding Coordinated Layers Improved data throughput with reuse of frequencies Reduced interference with coordinated layers Inter-Cell Interference Coordination (ICIC) in LTE Capacity off-load of macro network HetNet Public 2012-03-23 Page 8

Why embedded cells? Maximum spectral efficiency High bandwidth everywhere Simplified traffic management Example: 10 MHz all sites vs 5 MHz per layer - 50% more capacity - 100% higher bit rates F2 F2 F2 F2 HetNet Public 2012-03-23 Page 9 F1 F1 F1 F1

Adding low power nodes Downlink 3 GB/month 20MHz 10MHz 10MHz + 12 pico User Throughput [Mbps] Loss in macro layer by splitting spectrum Adding a large amount of small cells, can only partially overcome the loss in the macro layer Coverage Probability [%] Don t split the spectrum! HetNet Public 2012-03-23 Page 10 Source: Ericsson

Downlink/uplink Imbalance The HetNet handover dilemma For heterogeneous network deployments the transmit power of Micro can be much smaller than for macro (P pico << P macro ) Uplink sensitivity is similar between Macro and Micro The best uplink cell does not neccessarily correspond to the best downlink cell... Downlink: maximum CPICH Ec/No (or CPICH RSCP), RSRP Uplink: minimum path loss Optimal UL handover 10-15 db! Optimal DL handover Macro cell Micro cell Best downlink cell Best uplink cell Macro Macro Macro Micro Micro Micro Uncoordinated microcells will shrink in size HetNet Public 2012-03-23 Page 11

Important to Extend Pico Range Macro offload to increase total downlink capacity Leverage on pico uplink link budget and performance Soft Handover for fast closed-loop interference control Serving cell change Optimal UL handover Extended pico range (e.g. by a Cell Individual Offset) Optimal DL handover Macro cell Pico cell Best downlink cell Best uplink cell Macro Macro Macro Pico Pico Pico HetNet Public 2012-03-23 Page 12

Interference and traffic management Inter-RAT Multi-cell coordination Interference mitigation Inter-frequency Intra-frequency mobility HetNet Public 2012-03-23 Page 13

Interference Suppression a key HetNet feature Interference Suppression a key feature for HetNets with unpredictable sources of interference HetNet Public 2012-03-23 Page 14

Multi-Standard simplified Fewer nodes, mixed mode Service continuity Effective traffic management Smooth spectrum refarming WCDMA LTE WiFi GSM WCDMA LTE WCDMA LTE Similar cell plans the key HetNet Public 2012-03-23 Page 15

Hetnet coordination Iub/S1/X2 Enhanced Iub S1/X2 Small RBS Ctrl Internet Main unit Small RBS RRU Macro RBS RRU RRU RRU Leverage on proven macro functionality Tight coordination through controller Advanced radio coordination when needed HetNet Public 2012-03-23 Page 16

UL coordinated multipoint Up to 3 times more data per subscriber, no loss of data speed Up to 12 times better data speeds on cell edges Macro and Pico jointly decode uplink signal with IRC-CoMP User Throughput [Mbps] 50 40 30 20 10 Macro+6 pico, IRC CoMP Macro+6 pico, No CoMP + HetNet Public 2012-03-23 Page 17 0 0 20 40 60 80 100 Coverage Probability [%]

DL coordinated scheduling Multi-cell scheduler Dynamically silence PDSCH transmission Exploit interference variations of bursty packet data Multi-cell channel knowledge for scheduling hypothesis Can be based on Rel-8 RSRP measurements Later DL CoMP RRU RRU RRU = no PDSCH HetNet Public 2012-03-23 Page 18

Operator Managed WiFi @ home Use of WiFi fixed broadband access from home Guests @ home Visiting your neighbors and utilize their WiFi @ HOTSPOT Visiting café s, airports, hotels, Automatic and Seamless log-in, SIM based authentication Leveraging on existing network infrastructure Compatible with a large number of existing phones and laptops No extra device clients needed HetNet Public 2012-03-23 Page 19

Small cell backhaul Fiber, P2P GbE + other Copper: DSL LOS & NLOS wireless backhaul Copper: CAT5/6 + other Total Small Cell Backhaul outdoor indoor HetNet Public 2012-03-23 Page 20

Backhaul: Outdoor scenario Outdoor infrastructure: LOS / NLOS wireless backhaul Fiber, eg pwdm GbE DSL over Legacy POTS UTP prbs LOS/NLOS Optional mobile aggregation node DSL, Fiber Fixed Access Node: DSLAM / PON OLT IP Aggregation Public / carrier grade IP C- node WCDMA LTE WiFi HetNet Public 2012-03-23 Page 21

Backhaul: indoor scenario Indoor infrastructure: prbs prbs LAN UTP (CAT5/6) Legacy telephony UTP (CAT3 or similar) P2P Fiber, carrying GbE or Main-remote interface Alternative transmission, eg powerline GbE prbs prbs RRU GbE fiber prbs prbs RRU GbE, VDSL2 IPG Fiber/MW Leased or self-built C- node WCDMA LTE WiFi HetNet Public 2012-03-23 Page 22

Importance of SON in hetnet Deployment Automated planning Automated Preparation Automated Integration Maintenance Automated monitoring Automated failure handling Automated administration Optimization Coverage Capacity Performance Energy Efficiency Smart Simplicity HetNet Public 2012-03-23 Page 23

Self-organizing hetnet Full Network control perspective Network view/policy control Efficient provisioning Simplified control Distributed responsibility Information on per need Self-organizing HetNet Public 2012-03-23 Page 24

Efficient provisioning no preparation Network view/policy control auto-integrated simple site work Self-organizing Simplified control Distributed responsibility Information on per need HetNet Public 2012-03-23 Page 25

Network perspective capacity coverage KPI OAM Network view/policy control energy efficient Self-organizing Simplified control Distributed responsibility Information on per need HetNet Public 2012-03-23 Page 26

Some Scenarious for small cell deployments HetNet Public 2012-03-23 Page 27

The street mrbs HetNet Public 2012-03-23 Page 28

Train station mrru HetNet Public 2012-03-23 Page 29

High-rise: lobby HetNet Public 2012-03-23 Page 30

Small office prbs HetNet Public 2012-03-23 Page 31

The square Integrated Antenna HetNet Public 2012-03-23 Page 32

HetNet ensures higher performance Combined HetNet Low power RBS Macro User Throughput [Mbps] Small cells Improved Macro Densified macro Standard Macro Coverage Probability [%] HetNet Public 2012-03-23 Page 33 Remote Radio User Throughput [Mbps] Combined HetNet Improved Macro Small cells Densified macro Standard Macro Coverage Probability [%] Source: Ericsson

references Landström, Sara, et. Al, Heterogeneous Networks Increasing Cellular Capacity, Ericsson Review, No.1, 2011. (http://www.ericsson.com/res/thecompany/docs/publications/ericsson review/2011/heterogeneous ne tworks.pdf) Heterogeneous Networks: Meeting Mobile Broadband Expectations With Maximum Efficiency, Ericsson White Paper, February 2012. (http://www.ericsson.com/res/docs/whitepapers/wp-heterogeneous-networks.pdf) It All Comes Back To Backhaul: Solutions Supporting Superior End-to-End Quality Of Experience In Hetnet Deployments, Ericsson White Paper, February 2012. (http://www.ericsson.com/res/docs/whitepapers/wp-heterogeneous-networks.pdf) Smarter Self-organizing Networks: Intelligent Support To Address The Mobilebroadband Growth Challenge, Ericsson White Paper, February 2012. (http://www.ericsson.com/res/docs/whitepapers/wp-self-organizing-networks.pdf) Damnjanovic, Aleksandar, et. al., A Survey On 3GPP Heterogeneous Networks, IEEE Wireless Communications, June 2011. Erik Dahlman, Stefan Parkvall, and Johan Skold, 4G LTE/LTE-Advanced for Mobile Broadband (Academic Press), Ch. 13.4. HetNet Public 2012-03-23 Page 34