lte介紹諾基亞西門子內(nèi)部培訓(xùn)資料(存儲版)
【正文】 for frequency reuse of one ? no frequency planning required ? Intersite interference coordination is possible by exchanging load information over X2 interface = soft frequency reuse ? Current simulations show no clear performance gains in downlink from intersite interference coordination ? Some performance potential in uplink by exchanging overload indicator information X2 X2 For internal use 31 169。 Nokia Siemens Networks Charles / 20220505 Functionality of L2 Layer (MAC, RLC, PDCP) MAC ? Data Transfer via Logical Channels. ? Multiplexing Logical Channels and mapping to Transport Channels. ? Scheduling and Radio Resource Allocation between UEs and between Logical Channels. ? Transport Format Selection. ? Hybrid ARQ Protocol. For internal use 23 169。 Nokia Siemens Networks Charles / 20220505 LTE Radio principles ? Power efficient uplink increasing battery lifetime ? Improved cell edge performance by low peak to average ratio ? Reduced Terminal plexity Uplink: SCFDMA ? Enabling peak cell data rates of 173 Mbps DL and 58 Mbps in UL * ? Scalable bandwidth: / 3 / 5 / 10 /15 / 20 MHz also allows deployment in lower frequency bands (rural coverage, refarming) ? Short latency: 10 – 20 ms ** ? Improved spectral efficiency ? Reduced interference ? Very well suited for MIMO Downlink: OFDMA * At 20 MHz bandwidth, FDD, 2 Tx, 2 Rx, DL MIMO, PHY layer gross bit rate ** roundtrip ping delay (server near RAN) For internal use 17 169。 Nokia Siemens Networks Charles / 20220505 For internal use LTE Architecture For internal use 10 169。 Nokia Siemens Networks Charles / 20220505 For internal use LTE motivation and background For internal use 4 169。 Nokia Siemens Networks Charles / 20220505 Outline ? LTE motivation and background ? 3GPP schedule ? LTE Key Technology ? LTE architecture ? LTE physical Layer ? LTE layer 2/3 ? LTE Peak Bit Rates ? Spectral Efficiency ? Voice evolution in LTE/SAE ? Nokia Siemens Networks LTE 3 169。 Freq. (Frequency Selective Scheduling) TX RX Tx Rx MIMO Channel DL: OFDMA UL: SCFDMA scalable HARQ: Hybrid Automatic Repeat Request 64QAM Modulation 1 2 2 1 NACK ACK Rx Buffer Combined decoding 9 169。 Nokia Siemens Networks Charles / 20220505 Orthogonal Frequency Division Multiplexing Figure 1: FrequencyTime Representation of an OFDM Signal OFDM is a digital multicarrier modulation scheme, which uses a large number of closelyspaced orthogonal subcarriers. Each subcarrier is modulated with a conventional modulation scheme (such as QPSK, 16QAM, 64QAM) at a low symbol rate similar to conventional singlecarrier modulation schemes in the same bandwidth. For internal use 16 169。 RLC) terminate in BTS (eNode B) ? Also PDCP (Packet Data Convergence Protocol) terminates in eNode B – PDCP includes IP header pression and ciphering For internal use 22 169。 Nokia Siemens Networks Charles / 20220505 For internal use Spectral Efficiency For internal use 30 169。 Nokia Siemens Networks Charles / 20220505 Flexi Multimode System Module Features, characteristics and capabilities Flexi Multimode System Module ?Outdoor capable, low volume, low weight ?Mature multimode HW for field deployment ?Integrated Baseband, BTS Control and Transport ?Optical interfaces (OBSAI) to RF Modules ?Important part of Nokia Siemens Networks? globally launched “Green Initiative” for environmental sustainability (Energy Efficiency solution) ? Outdoor capable ? 35 … +55 176。 A 42 169。 C Support for up to 20km distance from System Module
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