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4G LTE Standards Standard of 4G LTE Jia SHEN CAICT 1 Course Objectives: Evolution of LTE-Advanced LTE-Advanced pro 2 2 Evolution of LTE/LTE-A technology standard Peak rate LTE-Advanced 3Gbps R10 R11 R12 LTE • Distributed • D2D R9 antenna • TDD Flexible 300Mbps R8 • dual layer CoMP slot beamformi • Enhanced allocation ng • CA MIMO • 3D MIMO • Terminal • Enhanced • OFDM • Enhanced CA • … location MIMO • MIMO • … technology • Relay • … • HetNet 2008 2009 • … 2011 2012 2014 Terminal location technology dual layer3 beamforming CA Enhanced antenna Relay Course Objectives: Evolution of LTE-Advanced CA Enhanced MIMO CoMP eICIC Relay LTE-Advanced pro 4 4 Principle of carrier aggregation （CA） Carrier aggregation • In order to satisfy the design of LTE-A system with the maximum bandwidth of 100MHz, and to maintain the backward compatibility，3GPP proposed carrier aggregation. In the LTE-A system, the maximum bandwidth of a single carrier is 20MHz Participate in the aggregati on of the various LTE carrier is known as the LTE-A mem ber carrier (Component Car rier, CC) Standard Considering the backward compatibility of LTE system, the maximum bandwidth of a single carrier unit is 20M Hz in the LTE-A system. All carrier units will be designed to be compatible with LTE, but at this stage it does not exclude the considerati on of non - backward compatible carriers. In the LTE-A FDD system, the terminal can be configured to aggregate different bandwidth, different number o f carriers. For TDD LTE-A systems, the number of uplink and downlink carriers is the same in a typical scence. In the LTE-A system, CA supports up to 5 DL carriers. 5 Classification of CA contiguous CA f Component carriers are successive adjacent LTE carriers . Band A • Good Compatibility, simplify the configuration of the base station and terminal, can be used in the frequency distribution, such as 3.4GHz~3.8GHz high frequency section f Band A Non-contiguous CA Component carriers are composed of non continuous LTE carrier.(Intra o f r Inter band) •More flexible . Band A Band B Symmetric CA UL CC1 CC2 There are same number of carriers in Uplink and downlink . Symmetric type •Can follow the LTE system standards, good compatibility, support FDD, TDD DL CC1 CC2 Asymmetric CA UL CC1 There are different number of carriers in Uplink and downlink . Asymmetric type •higher peak rate, lower peak to average ratio，reduce control channel DL CC1 CC2 and satisfy user's diversity 6 Course Objectives: Evolution of LTE-Advanced CA Enhanced MIMO CoMP eICIC Relay LTE-Advanced pro 7 7 Technology principle of TM9 • TM9 is a kind of multi beam forming technology with the advantages of TM4 and TM7/8. • Tm9 supports 8 antenna port configuration ，so it could further improving the throughput and spectrum efficiency of downlink transmission. • TM9 uses new public reference signal CSI-RS, for the channel information （ CQI, PMI, RI ） measurement. • Channel state information （CSI）and New codebook , TM9 supports two kinds of CSI feedback mode:the "code book" and "non code based” • Technical difficulties of TM9 ： • Selections of code book and pre coding scheme • Effect of codebook TM9 on LTE R8 terminal • Contradictions between non codebook TM9 and CA/CoMP • Promotion of performance gain 8 Two pre coding schemes for TM9 TM9 Based on codebook TM9 Based on non-codebook Whether need Codebook or not Yes No Whether need UE feedback PMI or not Yes No Whether need CSI-RS or not Yes No Whether need SRS or not No Yes TM9 Based on codebook TM9 Based on non-codebook Advantages Advantages • Does not sensitive to environment and mobile speed. • Pre coding schemes determined by BS. • Better support for asymmetric CA and COMP. • Same implementation leads good Forward • Suitable for user intensive scences. compatibility . • Better support for uplink single antena. • Make full use of the interaction of TDD system Disadvantages • When UE moves in low speed, it can bring significant gain . • Need UE’s feedback, the complexity of the pre coding Disadvantages selection is at the UE side. • Sensitive to environment and movement speed, • Because CSI-RS will seriously affect the performance of the performance of NLOS and high speed scene the R8&R9 terminal, so the base station needs to avoid decreased obviously. scheduling. • Asymmetric CA, uplink COMP, large user amount • Make no use of the interaction9 of TDD system. caused by SRS resource constraints can not be very good support. Course Objectives: Evolution of LTE-Advanced CA Enhanced MIMO CoMP eICIC Relay LTE-Advanced pro 10 10 What is CoMP？ CoMP（Coordinated Multi-Point） is a kind of distributed antenna technology,it could Improve system capacity and coverage through the coordination of neighboring base Improve the performance of stations . Macrocell A Macrocell B cell edge users By sharing CSI Macrocell A Macrocell B /Data,CoMP provides multi-point service UE B for users,which is UE B UE A divided into DL UE A multi-point and UL JP multi-point. CS/CB JP(joint processing)：Cooperative set share channel information and data information . CoMP CS/CB(Coordinated scheduling/beamforming)：Service data obtained from a service cell 11 Technical principle of CoMP Ⅰ By using dynamic coordination between a plurality of geographically separated transmission points (a base station or a cell) ,CoMP enhanced coverage of high data rates .CoMP reduce the intra-frequency interference, improve the throughput of the cell edge UE, improve the system throughput . JP CS/CB Downlink Downlink Uplink Uplink 12 12 Technical principle of CoMP Ⅱ JP • Through the sharing information, base station take the inter cell interference as useful signal to conduct joint processing • The cooperative scheduling or beam forming is carried out among the transmission points to reduce the CS/CB interference between the overlapping regions of each transmission point. CoMP cooperation set: A set of transmission points directly or indirectly involved in the downlink data transmission CoMP CoMP transport set: A collection of 分簇 transmission points that transmit data directly to the UE CoMP measurement sets: A collection of cells need to report the UE link related to the channel state information or the channel statistical information. 13 13 Course Objectives: Evolution of LTE-Advanced CA Enhanced MIMO CoMP eICIC Relay LTE-Advanced pro 14 14 ICIC in LTE Besides the OFDMA networking mechanism, LTE system can also use a series of enhanced technology to suppress the intra-frequency interference ： ICIC Intelligent scheduling and interference coordination Channel code + Cell scrambling User plane & Signalling User plane Beamforming CDMA & Low correlation sequence 2 列 2 1 序 ZC 列 列 ZC 序 序 序 C C 列 Z Z 1 broadcast & Signalling User plane Introduction of eICIC Technology • The above mentioned techniques are used for horizontal interference Vertical interference of macro cell and micro station suppression. • eICIC technology is the "vertical interference" suppression of heterogeneous networks (HetNet) between different layers. LPN cell interfered with macro cell • Heterogeneous network is a network with low power nodes(LPN) added in the original cellular coverage area，used in indoor and hot scenes coverage enhancement and optimization problems. • LPN includes Pico (Pico with cell), HeNB (Femtocell) and a relay node. Macro cell interfered with LPN cell 16 Implementation scheme of eICIC Technology CRE（Cell Range Extension）：Using RSRP configuration, CRE can expand the area ABS： only transmits CRS signal in macro coverage of Picocell, increase the number of cells,while transmit data&control info in users access Picocell, thereby reducing the Picocell.By using ABS subframes,,the inter-cell interference of edge users, and achieve the interference is reduced. purpose of sharing the macro cell load. Macro BS ABS Picocell coverage has LPN LPN ues marco BS’s been improved ABS to transimit Macro BS LPN CRE is actually a tilt type of scheduling-To access users who should not be accessed into ABS requiers coordination between Macro BS Picocell. Equivalent to enhance the coverage of and LPN. the Picocell. 17 Course Objectives: Evolution of LTE-Advanced CA Enhanced MIMO CoMP eICIC Relay LTE-Advanced pro 18 18 Introduction of Relay •Don’t need Fiber backhaul link Reduce network cost and equipment room . ， Flexible deployment •Small volume wireless backhaul Improve network • Distributed antenna, resource reuse, capacity cooperative communication Placed at the edge of the cell Expand coverage to expand coverage Place in hot spots Placed at the edge or indoor to of the cell to improve system expand coverage capacity 19 Course Objectives: Evolution of LTE-Advanced LTE-Advanced pro 20 20 Evolution trend of "4.5G R11 (2011-2012) R12 (2011-2012) R13 (2012-2014) LTE-A Basic version LTE-A Enhanced version • CA • CoMP • Small cell enhancement • Enhanced MIMO • FeICIC • Dynamic TDD LTE-A pro • New carrier type • Relay • 3D-MIMO • Enhanced control • D2D • eICIC channel 4.5G Vertical deepening Horizontal expansion Spectral efficiency and Penetration in other wireless throughput improvement communications 3D MIMO LTE D2D vs bluetooth D2D enhancement LAA/LWA vs WLAN Multiple user overlay LTE V2X vs 802.11p transmission LTE-M vs ZigBee CA enhancement GCSE vs Tetra… Evolution trend of 4.5G:Internet of things According to MTC demand, 4.5G has produced several versions of LTE-M for different markets： In 2015Q1, Sequans released Cat1 chip which would reduce UE cost less then 3G. The latest version of the two LTE-M technology
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