Views for The LTE-Advanced Requirements 3GPP TSG RAN IMT Advanced Workshop REV-080003 Shenzhen, China, April 7 – 8, 2008 Views for The LTE-Advanced Requirements Agenda Item: 2.2 Manufacturers views Source: Nokia & Nokia Siemens Networks

Outline Requirements from ITU-R IMT-A process Mobile Internet Outlook LTE-Advanced Optimization for Nomadic / Local Area LTE-Advanced Requirements - Suggested Upgrades to 25.913 Conclusions

IMT-A Requirements: Requirements from ITU-R IMT-A process Mobile Internet Outlook LTE-Advanced Optimization for Nomadic / Local Area

Status on IMT-A: Outcome from ITU-R WG5D meeting in January The technical minimum requirements to IMT-A are given in draft IMT.TECH from ITU-R WG5D #1 in January to be finalized in WG5D #2 in June The following minimum requirements are defined (values still largely open): Cell spectral efficiency Peak data rate (=peak spectral efficiency) Bandwidth Cell edge user throughput Latency Mobility Handover VoIP capacity

Draft IMT-A Minimum Requirements Summary Draft values Comments Cell spectral efficiency Base coverage Urban DL: [2.1] b / s / Hz /cell UL: [1.5] /[1.2] b / s / Hz / cell Downlink – 4x2, Uplink – 2x4 / 1x4 Peak data rate (=peak spectral efficiency) DL: [7/10] b / s / Hz UL: [2.5/5] b / s / Hz Downlink – 4x4, Uplink – 2x4 Bandwidth [20/40] MHz. Extensions up to 100 MHz Cell edge user throughput DL: [0.06] b / s / Hz / user UL: [0.03] b / s / Hz / user Latency [100 ms] Control plane [10ms] User Plane From idle to active state One-way transit time Mobility Up to 350 km / h Handover Intra Frequency [25/30]ms Inter Frequency [tbd] VoIP capacity [40] active users / MHz / cell Maximum number of users per cell ? Note: “Red” numbers in [ ] are draft number to be agreed in ITU-RWG5D #2 in June

Mobile Internet Outlook Internet traffic volume is increasing exponentially – doubling approximately each 6-12 months ~ x100-1000 increase in data volume can be expected within the next decade Large fraction of Internet services will go mobile Low flat-rate tariffs for mobile data services have just started the mobile data tornado Cost per bit reduction must follow the trend in user traffic volume increase Real user data rates 10-50 Mbps at “preferred” user locations (home, work, coffee shops, centers, airport, hotel) 1-10 Mbps everywhere else. 80-90% traffic volume generated in indoor and hot-spot Nomadic scenarios One secure subscription / identification ({U}SIM) Best connected everywhere Subscription portability Transparent mobile / nomadic connectivity (Wide Area / Local Area) Local decentralized services: Local WEB cacheing, proxy and content servers to achieve low response time and minimize backhaul transmission Location and context aware services

LTE-Advanced Optimization for Nomadic / Local Area EUTRA/EUTRAN is close to fulfilling the minimum requirements for high mobility wide area coverage Focus needed on improvements for nomadic and local area (LA) scenarios Backwards compatible solutions may not seize all (local area) optimization opportunities and new deployment options, e.g. Optimization of numerology for low mobility LA Optimization of physical and data link layers for High data rate High spectral efficiency Low mobility Reduced network complexity for LA Low number of users per cell (not VoIP optimization centric) Support of uncoordinated LA eNB deployment Support of flexible spectrum use and spectrum sharing Support of relays

LTE-A Requirements Suggested Upgrades to 25.913

6. LTE-A Capability-Related Requirements Peak Data Rate IMT.TECH set requirements to minimum bandwidth and peak spectral efficiency. We anticipate a research target of 1 Gbps for DL and 500 Mbps for UL in 100 MHz BW, but at this stage we do not suggest this stretching target as a system requirement. Suggested requirements: Peak spectral efficiency of 15 bits/s/Hz in DL and 7.5 bits/s/Hz in UL Scalable bandwidth exceeding 20 MHz, potentially up to 100 MHz Latency C-plane Latency: 100 ms (Similar to 25.913) U-Plane Latency: 5 ms (Similar to 25.913) Supported number of users C-plane Capacity: 400 users in active state (potentially less for LA) (Similar to 25.913)

7. LTE-A System Performance Requirements User throughput IMT-A set minimum requirements to user throughput (in terms of spectral efficiency) We anticipate significantly higher targets for UL and slightly higher for DL Suggested requirements: DL [tbd] bits/s/Hz (numbers from IMT.TECH can potentially be used) UL [tbd] bits/s/Hz (numbers from IMT.TECH can potentially be used) Spectrum efficiency IMT-A set minimum requirements to spectrum efficiency Mobility: Similar to 25.913 Coverage: Similar to 25.913 with increased attention to improved indoor coverage solutions Further Enhanced MBMS: Similar to 25.913 Network synchronization: Similar to 25.913. Option of loose “air-interface” synchronisation

8. LTE-A Deployment-Related Requirements Deployment Scenarios LTE-A should in general be considered to be a backwards compatible enhancement to E-UTRA / E-UTRAN LTE-A Local Area solution should also be considered for standalone deployment, e.g. with no previous wide area E-UTRA / E-UTRAN, but with interworking with existing UTRAN and/or GERAN coverage Spectrum flexibility Scalable bandwidth exceeding 20MHz, potentially up to 100MHz Channel bonding should be considered Necessity of channel aggregation and possible target bands should be carefully evaluated Solutions for both paired and unpaired operation Spectrum deployment Similar to 25.913 New IMT-A bands (total IMT bands) The potential of flexible spectrum usage mechanisms to enable FSU within the same Radio Access Technology between operators Co-existence and interworking with 3GPP RAT

9. LTE-A Requirements for E-UTRAN Architecture and Migration Similar to 25.913 Advanced E-UTRAN shall be backwards compatible with E-UTRA, potentially enhanced with new functionalities and architecture elements if justified by performance enhancements or cost reduction. Increased focus on decentralized network architecture, especially for nomadic/local deployment solutions

10. LTE-A Radio Resource Management Requirements Enhanced support for end-to-end QoS Requirements similar to 25.913 Efficient support for transmission of higher layers Support of load sharing and policy management across different radio access technologies Increased focus on advanced E-UTRAN Wide Area / Local Area deployment scenarios

11. LTE-A Complexity Requirements Complexity requirements for overall system Requirements similar to 25.913 Simplified operability by introducing additional automated functionalities Complexity requirements for UE Avoid setting mandatory requirements to UE’s which are in practice optional to the E-UTRAN and not supported by the majority of E-UTRAN vendors

12. LTE-A General requirements Cost-related requirements Requirements similar to 25.913 Advanced E-UTRA/E-E-UTRAN should have increased focus on cost reduction solutions Backhaul cost reduction Cost per bit reduction OPEX and CAPEX reduction by automatic and autonomous network configuration and operation Service-related requirements Similar to 25.913 Increased focus on new service scenarios

Conclusions LTE Advanced shall meet or exceed the IMT-Advanced minimum capabilities. Requirements for LTE Advanced shall not be less than those contained in TR25.913. Advanced E-UTRA / E-UTRAN shall be based on E-UTRA / E-UTRAN evolution. Non-backwards compatible elements can be studied as part of LTE-A SI, but subject for evaluation in RAN level. Main focus on Requirements: Nomadic / Local Area deployment scenarios Increased focus on cost reduction solutions Peak spectral efficiency of 15 bps/Hz (DL) and 7.5 bps/Hz (UL) Enhanced average cell capacity of [tbd] (DL) and [tbd] (UL) Enhanced (cell edge) user throughput of [tbd] (DL) and [tbd] (UL) Scalable bandwidth exceeding 20 MHz, potentially up to 100 MHz Spectrum flexibility