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华为最新版Massive MIMO技术白皮书.pdf

发布时间：2022-06-03 发布人：admin 分类：说明书 资料大小：12.89M 资料格式：pdf 举报 版权申诉
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    Contents 01 Executive Summary 02 03 04 05 Gains Offered by TM9 LTE Demands for Continuous Growth of Network Capacity LTE Evolving towards Multiple-Antenna Technology for Improved Capacity TM9 is Essential to Enable FDD Narrow Beam in Multiple-Antenna Network 5.1 TM9 MU-MIMO to Achieve 3 to 5 fold Capacity Gains 5.2 TM9 SU-MIMO to Improve User Experi- enced Data Rate by 30% to 50% 5.3 TM9 DL CoMP to Improve CEU Experience by 20% to 40% 06 TM9 Industry Status 07 Appendix 7.1 Glossary 7.2 Reference 3 4 6 8 11 11 12 13 15 16 16 17
    The introduction of TM9 eliminates restrictions previously imposed by reference signal overhead on LTE multiple-antenna evolution and is a prerequisite for FDD beamforming and coordination features. TM9-based multiple-antenna technology significantly expands cell capacity and improves the experienced data rate and cell edge user experience. TM9 multiple-antenna technology is a major LTE evolution feature, and similar technologies will be used in future 5G era network. The TM9 industry has quickly matured, and large-scale commercial deployments will occur in 2018. 3
    After deployment during nearly a decade, LTE now carries approximately 80% of the MBB traffic and has become the fundamental network to provide MBB services. Over the next decade, the number of LTE users will continue to significantly grow. GSMA estimates that there will be a net increase of around 3 billion LTE users by 2025. Meanwhile, traffic demand keeps growing from web browsing to HD video. The data of usage (DOU) in some countries already exceeds 10 GB/month. DOU (GB/Month) Source: Huawei The 5G non-standalone (NSA) NR specifications have been frozen on December 21, 2017. These specifications define LTE as a basic bearer of 5G NSA. LTE technologies will evolve along with 5G NR to fulfill the requirements of 5G users for consistent service experience. 4
    Benefiting from a wide network coverage, a huge base of users, and a large number of UE models, LTE will still remain the major network technology providing MBB services over the next decade. In addition, LTE traffic is expected to grow several folds. Hence, improving LTE capacity is critical. Global Cellular Data Traffic by Network Generation s e t y b a x E 350 300 250 200 150 100 50 0 5 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 Source: Strategy Analytics
    Various technologies and solutions have been developed to meet the growing demand for more capacity, such as bandwidth expansion and site densification. However, these approaches have limitations. For example, bandwidth cannot be expanded indefinitely, and site acquisition is getting more arduous. Multiple-antenna technology has been introduced to make a new way to ensure smooth capacity expansion. Multiple-antenna technology, also known as MIMO (multiple-input multiple-output), uses multiple transmit and receive antennas and spatial multiplexing technology to significantly achieve coverage and capacity gains resulting in improved user experience without additional spectrum required. The following figure shows an M×N MIMO system consisting of M transmit antennas and N receive antennas. Transmitter Tx #1 Rx #1 Receiver Encoder Decoder #M #N MxN MIMO 6
    4-antenna technology has been introduced since the initial stage of LTE development. 4x4 MIMO supports simultaneous transmission of up to four data streams, almost doubling the peak rate of 2x2 MIMO. Impressed by the large gains offered by 4T4R, there are already around 150 4T4R networks deployed globally up to now. Even if UEs have only two antennas, which means maximum data stream number transferred to this UE cannot exceed two, 4x2 MIMO can still achieve a much higher average throughput than 2x2 MIMO. This is because a 4-antenna eNodeB obtains more accurate channel measurement results and feedback, and produces more spatial diversity gains. Average perceived throughput gains offered by 4x2 MIMO in contrast with 2x2 MIMO 80% 70% 60% 50% 40% 30% 20% 10% 0% 75.5% 46.1% 16.1% 4×2 MIMO/light load 4×2 MIMO/medium load 4×2 MIMO/heavy load (10%) (50%) (70%) More antenna ports multiply the peak UE throughput and cell capacity. Multiple-antenna evolution has consequently become a major LTE evolution path. 7
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