LONG-TERM EVOLUTION
TOPIC OUTLINE Mobile Communications Evolution LTE Overview and Architecture LTE Radio Interface LTE Planning Plannin g and Optimization
TOPIC OUTLINE Mobile Communications Evolution LTE Overview and Architecture LTE Radio Interface LTE Planning Plannin g and Optimization
Mobile Communications Evolution
INTRODUCTION
Typical Next Generation Services
Typical Network Evolutions
Typical Network Evolutions
LTE Overview and Architecture
2G vs 3G vs LTE Architecture 2G User Element
Radio Access Network
Core Network
3G
LTE
Mobile Station
User Equipment
User Equipment
BTS/BSC
- NodeB/RNC
- eNodeB
Mobile Switching Center (MSC)
CS: MSC/GMSC
Evolved Packet Core (EPC)
PS: SGSN/GGSN
LTE E-UTRAN Objectives
LTE E-UTRAN Objectives Peak data rates target 100 Mbps (downlink) and 50 Mbps (uplink) for 20 MHz spectrum allocation, assuming 2 receive antennas and 1 transmit antenna at the terminal. Target for downlink average user throughput per MHz is 3-4 times better than release 6. Target for uplink average user throughput per MHz is 2-3 times better than release 6. (release 6 – HSPA)
LTE E-UTRAN Objectives Downlink target is 3-4 times better than release 6. Uplink target is 2-3 times better than release 6. The one-way transit time between a packet being available at the IP layer in either the UE or radio access network and the availability of this packet at IP layer in the radio access network/UE is less than 5ms.
LTE E-UTRAN Objectives Scalable bandwidths of 5, 10, 15, 20 MHz are supported. Also bandwidths smaller than 5MHz are supported for more flexibility. Interworking with existing UTRAN/GERAN systems and non-3GPP systems is ensured. Multimode terminals support handover to and from UTRAN and GERAN as well as inter-RAT measurements. Interruption time for handover between E-UTRAN and UTRAN/GERAN is less than 300 ms for real time services and less than 500 ms for non real
LTE E-UTRAN Objectives MBMS is further enhanced and is then referred to as E-MBMS. The system is optimized for low mobile speed (0-15km/h), but higher mobile speeds are supported as well including high speed train environment as special case.
LTE E-UTRAN Objectives Operation in paired (Frequency Division Duplex / FDD mode) and unpaired spectrum (Time Division Duplex / TDD mode). Co-existence in the same geographical area and co-location with GERAN/UTRAN. Also, coexistence between operators in adjacent bands as well as cross-border coexistence. End-to-end Quality of Service (QoS) is supported.
System Architecture Evolution
Evolved UMTS Radio Access Network (E-UTRAN)
Evolved UMTS Radio Access Network (E-UTRAN)
Evolved UMTS Radio Access Network (E-UTRAN)
Evolved Packet Core (EPC)
Evolved Packet Core (EPC) Serving Gateway (SGW)
Evolved Packet Core (EPC) Mobility Management Entity (MME)
Evolved Packet Core (EPC) Packet Data Network Gateway (P-GW)
Evolved Packet Core (EPC) Serving Gateway; router, packet marking, anchor for inter-eNB handover, some accounting Mobility Management Entity; NAS signalling point, admission control, bearer setup, authentication, roaming roaming functions, selects SGW Packet Gateway; date entry/exit point, packet inspection/filtering, inspection/filtering, IP address allocation, mobility anchor for non-3GPP handover
LTE Reference Points
LTE Roaming Architecture
Interworking with 2G/3G networks
Interworking with 2G/3G networks
LTE Spectrum Requirements
LTE Radio Interface
Resource Sharing Techniques TDMA
CDMA
FDMA
W-CDMA
W-CDMA Improvements
High Demand Problems Exhaustion of Spectrum
High Spectral Efficiency
Very High Data Rates
Complexity in Wireless Channels
Multi-Carrier Wireless Transmission System
OFDM (Orthogonal Frequency Division Multiplexing)
CYCLIC PREFIX
CYCLIC PREFIX
CYCLIC PREFIX
OFDMA (Orthogonal Frequency Division Multiple Access)
OFDMA (Orthogonal Frequency Division Multiple Access) Bandwidth Scalability Carrier Aggregation Low ISI (Inter Symbol Interference)
OFDMA (Orthogonal Frequency Division Multiple Access)
OFDMA (Orthogonal Frequency Division Multiple Access)
LTE Planning and Optimization
RESOURCE ELEMENT
IFFT (Inverse Fast Fourier Transform)
SC-FDMA (Single Carrier - Frequency Division Multiple Access)
MIMO (Multiple Input Multiple Output) Techniques
MIMO (Multiple Input Multiple Output) Techniques
MIMO (Multiple Input Multiple Output) Techniques
MIMO (Multiple Input Multiple Output) Techniques
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MIMO (Multiple Input Multiple Output) Techniques
Single User, Multiple User, and Co-operative MIMO
Single User, Multiple User, and Co-operative MIMO
Single User, Multiple User, and Co-operative MIMO
Beamforming
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High Level Network Design Cycle
RF predictions and confirm assumptions Site inspection and backhaul planning Information gathering and
Build plan and drive test optimization
Factors Affecting the LTE Planning Process
LTE Frequency
