LTE Release 12 and Beyond


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LTE Release 12 and Beyond

  1. 1. LTE Release 12 and Beyond
  2. 2. 1. Introduction 2 2. Technology enablers coming with Release 12 3 2.1 Small cell enhancements 3 2.2 New Carrier Type 4 2.3 Macro cell enhancements 4 2.4 Machine-Type Communications 5 2.5 Further enhancements 6 3. Summary 6 4. Further Reading 7 1. Introduction Living up to what LTE promised, commercial As the media-intense lifestyle is set to LTE deployments have shown that LTE penetrate all social environments, another networks can deliver peak data rates of issue is end users’ continually rising up to 100 Mbps and average data rates of expectations of throughput and service - by tens of Mbps as well as latencies below 20 2020, a typical user will consume 1 Gbyte of milliseconds. The next step in LTE evolution data per day. Finally, operators need to secure has already been made, with LTE-Advanced their share of the mobile broadband market pushing peak data rates beyond 1 Gbps and by improving their operational efficiency and enhancing multi-band and multi-antenna network robustness, developing new business operation that is compatible with existing opportunities, extending their spectrum and by deployments. protecting their investment. The continuing demand for ever more capacity LTE Release 12 and beyond will provide the is driven largely by video usage. As outlined initial enablers of meeting these challenging by Nokia Siemens Networks in its Beyond demands as well as a smooth way into the 4G vision, a 1,000 fold increase in network Beyond 4G era. capacity requires increases in all dimensions: 10x 10x 10x 1000x Performance Spectrum Base stations capacity2 LTE Release 12 and Beyond
  3. 3. 2.  Technology enablers coming with Release 12Release 12 enhancements focus on the four (CoMP) techniques, as well as through Self-areas of Capacity, Coverage, Coordination Organizing Networks for small cell deployments.(between cells), and Cost. Improvementsin these areas are based on using several Finally, new spectrum footprint and newtechnology enablers: small cell enhancements, business will be opened up by optimizing themacro cell enhancements, New Carrier Type system for Machine-Type Communications,(NCT) and Machine-Type Communications as well as by, for example, using LTE for(MTC). These enablers are described in public safety.this paper.Customer experience, capacity and coverage 2.1  Small cell enhancementswill be improved with small cell enhancements, The increasing traffic load will require morebased on inter-site Carrier Aggregation, cells and more capacity to cope withLTE-WLAN integration and macro cell the expected throughput. Release 12enhancements. Small cell enhancements are enhancements help small cell deployments inalso known as enhanced local access. two main areas - reducing mobility signaling in high density cells and improving user data ratesNCT helps achieve the required changes by using macro cells and small cells the physical layer and initially providesbase station energy savings, flexibility in The high number of small cells will increasedeployment and ways to reduce interference signaling traffic in the core network as usersin heterogeneous networks (HetNets). move frequently from one small cell to another. This situation will be improved by separatingImprovements in capacity and a more robust the user plane and control plane functions innetwork performance are achieved by 3D the Radio Access Network (RAN) architecture,Beamforming/MIMO (Multiple Input Multiple that is, letting the macro layer manage theOutput), advanced user equipment (UE) mobility while offloading high data traffic to thereceivers and evolved Coordinated Multipoint small cells. Capacity Small cell 1000x capacity enhancements increase Macro cell enhancements Coverage 1 GB per day per user everywhere New Carrier Type Coordination Efficiency and Machine-Type robustness Communications Cost SON, WLAN integration, New business, new Public safety spectrum footprintFigure 1: The Focus (a.k.a. The Four Cs), the Enablers, the Benefits LTE Release 12 and Beyond 3
  4. 4. Input assumptions for Performance benefits future HetNets Higher frequency > Power saving during 3 GHz low loading 4-8 antennas Minimized reference Small cell overhead especially in HetNet optimization Low number of users and New Improved beamforming per small cell Carrier Type with 4-8 transmit antennas TDD duplexing Flexible uplink: downlink asymmetry Figure 2: Deployment assumptions and benefits of small cell optimization and New Carrier Type Inter-site Carrier Aggregation – i.e. carrier small cell deployments through a significantly aggregation between sites – is an attractive shortened latency and an extremely flexible solution for HetNets that do not have an duplex scheme. ideal backhaul network. It allows mobility management to be maintained on the macro The main deployment assumptions and layer while aggregating small cells to provide performance benefits of small cell optimization extra user plane capacity, increasing the and NCT are shown in Figure 2. The throughput. Inter-site carrier aggregation is base station power savings and inter-cell one of Nokia Siemens Networks’ innovations interference savings are becoming more in the small cell area. The concept optimizes important as the number of small base performance by combining the benefits stations increases considerably. of macro cell coverage and small cell capacity. Based on increasing the bandwidth 2.3  Macro cell enhancements through carrier aggregation, inter-site carrier With exponential growth in network traffic, future aggregation can provide a cell edge gain of networks need to continue to evolve both in 50%, even in loaded networks. macro and small cells. There are opportunities to enhance the network capacity and coverage 2.2  New Carrier Type of current LTE macro cell deployment The New Carrier Type will allow the significantly by exploiting multi-antennas, optimization of small cells but can also be advanced receivers, network architectures and used in macro cells. Primarily, NCT will new spectrum. Macro cell enhancements are reduce common reference signal overhead attractive for operators because they allow and allow the operation of downlink control further exploitation of the existing base station channels to be based on demodulation sites and transport infrastructure. reference signals, in a stand-alone NCT solution. These generic optimizations are Base stations such as the Nokia Siemens expected to be implemented in LTE Release Networks’ Flexi Multiradio 10 Base Station 12 and will enable base station energy establish high capacity macro cells with the savings, flexibility in deployment and ways potential to double the spectral efficiency of to reduce interference in HetNets, as well existing LTE macro networks. The target is to as performance gains for four transmit support LTE and LTE-Advanced technology in antenna and eight transmit antenna macro the 700-2600 MHz bands, tight coordination base station configurations. NCT can optimize with small cells, for example in the 3.5 GHz4 LTE Release 12 and Beyond
  5. 5. band, and combinations of the followingfeatures: UE-specific elevation BF/3D-MIMO• arge number of transmit and receive L antennas: more than four transmit and receive antennas• ctive Antenna Systems (AAS) where A antenna and RF are built together• AS with vertical sectorization and user A specific elevation beamforming/3D-MIMO• dvanced uplink receivers A• ooperative Multipoint Transmission and C Reception (CoMP)• dvanced radio network architecture A including on-site resource pooling Figure 3: UE-specific 3D-MIMO• igh capacity backhaul H• uthorized Shared Access to gain access A to more spectrum low latency fiber backhaul (Centralized RAN), where a baseband pool serves the macro siteBy increasing the number of transmit and and underlay remote radio heads. Such areceive antennas at the base stations from radio network architecture allows for furthertwo to four and then to eight, a significant improvements in radio performance.gain in network capacity can be achieved.This gain can be further enhanced by using Last but not least, macro networks evolveadvanced receiver and single-user and multi- by exploiting Authorized Shared Access – auser MIMO schemes (SU/MU MIMO) based new and complementary way of authorizingon dedicated demodulation reference signals. spectrum use in addition to exclusive licensed spectrum – which leads to higher spectrumUsing active antennas where the RF availability and predictable QoS in the sharedcomponents are integrated into the antenna spectrum, thereby increasing the number ofand performing vertical sectorization or sector subscribers and the capacity of the network.specific elevation beamforming (using twofixed beams per sector) can give significantimprovements in sector capacity compared to 2.4  Machine-Type Communicationsa single beam system. Building upon vertical The number of embedded machine-to-sectorization, Release 12 will be developing machine modems is expected to increasetwo techniques namely a) UE-specific substantially in the future. While the urbanelevation beamforming that adds UE specific area today can have up to 5,000-10,000vertical beamsteering to existing azimuth-only subscribers per base station, the growth ofclosed loop SU/MU MIMO methods and b) machine-to-machine could see up to 100,0003D-MIMO techniques that simultaneously connected devices per base station, settingexploit both the azimuth and the elevation new requirements for the mobile network.dimensions of the multipath channel on auser-specific basis. These techniques are In addition to the already specified MTCexpected to give significant improvements in support in 3GPP, the following areas ofboth the cell edge and sector capacity. optimization are expected to be covered in Release 12:The concept of 3D-MIMO is illustrated in • etwork load optimizations will continue: NFigure 3. MTC-specific signaling and connectivity optimizations ensure that a very largeNext in line for deployment are centralized number of connected devices can besolutions such as cluster level on-site supported by the LTE radio, with smallresource pooling using high capacity and amounts of data delivered efficiently. LTE Release 12 and Beyond 5
  6. 6. • he low cost MTC device studies are T proper cell identity management and neighbor completed. Based on these, MTC device cell relations, as well as to enhance mobility costs can be reduced in various ways. robustness and load balancing in small For example, 15% cost savings can be cell coverage gaps. Additionally, intelligent achieved through simplification to a single solutions to easily switch small cell capacity receive antenna, 5% by accepting reduced layers to a power saving mode will be peak data rates and 10% by accepting essential. reduced maximum bandwidth. Furthermore, 3GPP will look for new 2.5  Further enhancements opportunities to enhance LTE-HSPA Self-Organizing Networks (SON) will play a integration and LTE-WLAN interworking, as key role in the efficient operation of dense well as to enable device-to-device discovery small cells. Mass deployments will introduce and communication for commercial and new requirements in SON functions to ensure public safety use. 3. Summary LTE evolution continues strongly in Release enabling energy savings, flexible deployment 12 and beyond by enhancing LTE and and improved interference management in LTE-Advanced operation. In particular, LTE HetNets. Release 12 addresses coordinated small cell deployments, macro cell enhancements, Release 12 features aim at boosting Machine-Type Communications, discovery in performance and at entering new areas and device-to-device communication, enhanced spectrum. The following two tables summarize SON, and in particular the New Carrier Type the most promising Release 12 features: Benefits from 3GPP Release 12 – Boost performance Rel12 feature Benefit Small Cell Enhancement •  Optimized small cell mobility by reducing Radio Access Network based on Inter-site CA to Core Network signaling •  Improved data rates by using macro and small cells together •  Efficient use of TDD spectrum New Carrier Type (NCT) •  Minimized inter-cell interference •  Lowered energy consumption • Significant overhead reduction for downlink 4-8 antenna transmission modes, hence resulting in an improved downlink spectral efficiency UE-specific elevation •  Significantly enhanced macro cell capacity and coverage beamforming / 3D-MIMO Advanced receivers •  Removing interference to increase uplink and downlink capacity Enhanced DL Coordinated •  Enhanced coverage by exploiting coordination in case of Multi-Point (DL eCoMP) non-ideal backhaul Enhanced SON •  Efficient operation of dense small cell deployments •  Energy savings in small cell capacity layers6 LTE Release 12 and Beyond
  7. 7. Benefits from 3GPP Release 12 – Expand to new areas and new spectrum Rel12 feature Benefit LTE-WLAN Integration •  10 Mbps minimum downlink data rate •  1000x hot spot capacity in present decade LTE-HSPA Integration •  Enhanced multi-technology support Machine-Type •  Get prepared for 50 Bn connected devices or 100.000 devices per cell Communications (MTC) Public Safety •  Secure operator’s market share by expanding LTE footprintNokia Siemens Network is a leadingcontributor in 3GPP, driving LTE and 2020+LTE-Advanced standards. It is also Beyond 4Gshaping Beyond 4G through various 2015+ LTE Advanced Evolutionactivities, including participation in the 2013+ Rel-12 and Rel-13EU FP7 collaborative project METIS and 2010+ LTE Advanced Rel-10 and Rel-11contribution to ITU-R IMT vision work. LTE Rel-8 and Rel-9 Figure 4: The radio evolution in the present decade4.  Further Reading• TE-Advanced – The advanced LTE toolbox L • eployment Strategies for Heterogeneous D for more efficient delivery of better user Networks, Nokia Siemens Network White experience, Nokia Siemens Networks White Paper Paper • 020: Beyond 4G – Radio Evolution for 2• aking advantage of the convergence of T the Gigabit Experience, Nokia Siemens Wi-Fi and 3GPP, Nokia Siemens Networks Networks White Paper White Paper • elease 12 and beyond for C4 (Cost, R• ong Term HSPA Evolution meets ITU IMT- L Coverage, Coordination of small cells, and Advanced requirements, Nokia Siemens Capacity), Nokia Siemens Networks 3GPP Networks White Paper presentation LTE Release 12 and Beyond 7
  8. 8. Nokia Siemens NetworksP.O. Box 1FI-02022 NOKIA SIEMENS NETWORKSFinlandVisiting address:Karaportti 3, ESPOO, FinlandSwitchboard +358 71 400 4000 (Finland)Switchboard +49 89 5159 01 (Germany)Copyright © 2012 Nokia Siemens Networks.All rights reserved.Nokia is a registered trademark of Nokia Corporation,Siemens is a registered trademark of Siemens AG.The wave logo is a trademark of Nokia Siemens Networks Oy.Other company and product names mentioned in thisdocument may be trademarks of their respective owners,and they arementioned for identification purposes only.This publication is issued to provide information only and isnotto form part of any order or contract. The products andservices described herein are subject to availability andchange without