2015 Ten hot new technology of the wireless field: March 13, 2015 Comments [0] Share to:: Sina microblogging qq space qq microblogging Baidu search Tibet and famous: Eagle to the occasion (ZTE) Posted Keywords: Wireless 5G MIMO Ultra Wideband Antenna The mobile Internet and the Internet of Things are growing at an unprecedented rate, making mobile data services explosive. In the future technological evolution, richer communication modes, better user experience, and wider application development are important development directions. In order to cope with the challenge of massive traffic, the mobile network is developing towards the “wireless network without capacity limitationâ€, that is, the “big pipelineâ€, and the technology continues to make breakthroughs. In the future-oriented evolution of wireless technology, adapting to the application scenario and satisfying the user experience are the decisive factors. Let me take a look at the top ten hotspots and new technologies in the wireless field with me, and communicate with friends in the industry. First, the new multiple access method In the future, 5G applications will focus on mobile broadband and the Internet of Things, and demand for high coverage, high capacity, low latency, and massive connectivity. 5G is bound to introduce new multiple access methods. Compared with various orthogonal/quasi-orthogonal multiple access schemes (TDMA/CDMA/OFDMA) in mainstream wireless communication systems, ZTE's new multi-access technology MUSA (MulTI-User Shared Access) is based on more advanced non- Orthogonal multiuser information theory. MUSA uplink access enables innovative and multi-user detection of complex domain multi-user based on Serial Interference Cancellation (SIC), enabling the system to support multiple reliable access times of multiple times on the same time-frequency resources; The resource scheduling process in the process can greatly simplify the system implementation of massive access, shorten the access time of massive access, and reduce the terminal energy consumption. The MUSA downlink provides a higher capacity downlink transmission than the mainstream orthogonal multiple access through innovative enhanced superposition coding and superposition symbol extension technology, and can also greatly simplify the implementation of the terminal and reduce the terminal energy consumption. Second, the new code modulation and link adaptation technology In the face of 5G core requirements, traditional link adaptation technology can not be satisfied, and the new code modulation and link adaptation technology can significantly improve system capacity, reduce transmission delay, improve transmission reliability, and increase the number of users access. . ZTE proposed soft link adapta (SLA), physical layer packet coding (PLPC), and Gbps high speed decoder (GHD). Soft link adaptation technology improves the accuracy of channel prediction and feedback methods, and solves the problem that the open-loop link adaptive OLLA has a long period, the impact of interference burst on performance, and the differentiation of QoS in various new scenarios of 5G. Demand (low latency / ultra reliable / high throughput / high speed mobile) and other issues. The physical layer packet coding technology can effectively solve the contradiction between large data packets and small coding blocks. Gigabit's ultra-high-speed decoder technology can significantly improve the speed of single users, meeting the requirements of 5G to support ultra-high-speed user data rates. Third, multi-antenna technology (Massive MIMO) At present, wireless network traffic has exploded, and methods for improving wireless network capacity include: improving spectrum efficiency, increasing network density, increasing system bandwidth, and intelligent service offloading. Among them, large-scale antenna array technology has received more and more attention. The basic feature of a large-scale antenna array is to obtain a more accurate beam steering capability than a conventional antenna array (no more than eight conventional antenna arrays) by arranging a large number of antenna arrays (from tens to thousands) on the base station side. Then, through spatial multiplexing technology, more users are served on the same time-frequency resource to improve the spectrum efficiency of the wireless communication system. Large-scale antenna arrays can suppress interference well, and bring huge interference suppression gains within and between cells, which further increases the capacity and coverage of the entire wireless communication system. The advantages of large-scale antenna array technology are obvious, but how to fully exploit its potential huge gain under realistic constraints needs to be further studied, especially the research on key technologies such as channel information acquisition, antenna array design and codebook design. ZTE is related technology. The field has achieved certain advantages. In November 2014, ZTE Corporation and China Mobile successfully completed the world's first 128-antenna Massive MIMO field pre-commercial test. Fourth, high frequency communication At present, the spectrum of wireless communication below 6 GHz is already very crowded, the available bandwidth is limited, and there are a large amount of available spectrum from 30 GHz to 300 GHz, which are very attractive for wireless communication. The millimeter wave band has a large transmission loss relative to the existing cellular carrier frequency. Due to the short high frequency wavelengths, the transmitter and receiver per unit area can be configured with more antennas to achieve greater beamforming gain to compensate for additional path loss. A base station using a high-gain antenna cannot use the preferred beam coverage to the receiving end until the weight is obtained. The terminal measurement is not accurate, and the communication parties cannot perform data communication with the preferred beam weight. It is difficult to align the high-gain narrow beam in the mobile environment. If the optimal beam identification is not achieved, the terminal cannot complete the cell camp or the barely camped cell but the transmission quality is poor, which is contrary to the high rate expectation of the 5G network. Therefore, beam identification and tracking are the key issues in high frequency communication. It is necessary to join the beam discovery process in the high frequency communication system so that the base station and the terminal can discover each other and use the preferred beam for high data volume communication. Five, wireless back Wired backhaul makes the cost of dense deployment unacceptable and greatly limits the flexibility of base station deployment. Microwaves as backhaul require additional spectrum resources and increase the hardware cost of the transport nodes. In the case of occlusion, the channel quality of the microwave will be seriously affected, which limits the choice of site and reduces the flexibility of deployment. Self-backhaul solves the problems of wired backhaul and microwave backhaul by using the same wireless transmission technology and frequency resources as the access link. However, Self-backhaul consumes the available resources of the access link, which limits the further increase in network capacity. Therefore, Self-backhaul capacity enhancement is an important research direction of UDN. The technical means for enhancing the capacity of Self-backhaul include: further expanding the spatial freedom by using multi-antenna technology; enhancing the receiving capability through the cooperation of the receiving end; exploiting the same service request by using content sensing technology, and improving resource utilization efficiency through multicast/broadcast; backhaul chain Dynamic resource allocation between the road and the access link. Sixth, community virtualization Virtual Cell is the key to solving the boundary effect. Its core idea is to provide services centered on users. The virtual cell is composed of multiple access nodes around the user, and it is updated like a shadow as the user moves and the surrounding environment changes, so that the user can obtain stable data communication services regardless of the location of the user. User experience. The virtual cell breaks the traditional mobile access network concept centered on "cell" and transforms into a completely "user-centric" access network. That is, each user of the access network has a "virtual cell" associated with the user, and the cell is composed of several physical cells surrounding the user, and the physical cells cooperate with each other to jointly serve the user. When the user moves in the network, the physical cell included in the virtual cell changes dynamically, but the virtual cell ID remains unchanged. Therefore, no handover occurs during the user's movement, and no matter where the user is, a good signal coverage and optimal access service from multiple surrounding physical cells can be obtained. The virtual cell is a revolution in the concept of mobile access, and truly realizes the transition from "users looking for a network" to "network chasing users." Seven, ultra-wideband base station UBR According to statistics, among the 54 operators in 14 countries in Europe, there are 45 with 1.8GHz and 2.1GHz dual-band, accounting for 83%. Large and medium-sized operators basically have multiple mobile band licenses, and carrier integration has greatly accelerated the wireless infrastructure sharing process. Wireless infrastructure is gradually developing from broadband to ultra-wideband. In 2015, URB (Ultra Broadband Radio), which supports multiple frequency bands, will have a rapid development opportunity. Ultra-wideband base station technology breaks through the limitation of one RF channel supporting only one frequency band, and realizes ultra-wideband processing capability of dual-band or multi-band simultaneous operation. Its core technologies include: ultra-wideband transceiver technology, ultra-wideband power amplifier technology, ultra-wideband DPD technology and collaborative duplex technology. Last year, ZTE launched the 1.8GHz+2.1GHz ultra-wideband UBR base station in the industry. The single-channel 365MHz transmission bandwidth can support both 1.8GHz and 2.1GHz bands, and can achieve power sharing between dual bands. Eight, fat base station The Fat NodeB technology is essentially a flattening of the network and can meet more complex application scenarios. It is a new type of network node that can be mixed with traditional base stations. First, the fat base station integrates some core network control plane functions, significantly shortens the terminal access signaling process, and simplifies the core network function, so that the core network only needs to focus on core services not related to the wireless system, and it is easier to provide more personality. Network services. Secondly, the fat base station integrates the gateway function of the core network. The traffic of the terminal directly enters the PDN network after passing through the fat base station, and does not need to be transmitted back to the remote core network gateway, thereby reducing the forwarding load of the core network user plane and reducing the transmission cost. In addition, the gateway down to the base station also facilitates content localization. Deploying the content server on the same site on the fat base station allows the terminal to obtain content nearby, which can greatly reduce the transmission delay and improve the user experience. The fat base station solution proposed by ZTE inherits and promotes the flattening of 4G. It is user-centric, making services and networks flatter and closer to end users. Nine, NFV / SDN technology Traditional telecom network has many special equipments. Compared with IT network construction, the operation cost is complicated, the operation and maintenance is complicated, and the business form is closed, the operators are faced with dilemma at both ends of the “receipt†and “supportâ€. In recent years, Network FuncTIon VirtualizaTIon (NFV) and Software Defined Network (SDN) technologies have enabled operators to see the dawn. The technical foundation of NFV is virtualization technology. Virtualization technology provides the means to virtualize a set of server-related resources (such as computing, storage, and networking) into multiple different virtual machines for different users. The introduction of virtualization technology in the telecommunication network can realize the sharing of hardware resources of the telecommunication network, improve the utilization of hardware resources, and open a convenient door for the rapid introduction of new third-party services. After the telecommunication network function itself supports virtualization, it is decoupled from dedicated hardware devices, making it possible for the telecommunication network to adopt IT and generalized hardware resources, which is beneficial for operators to reduce hardware procurement costs. The SDN technology is derived from the routing control of the IP network. By separating the control and forwarding of the routing device, it converts the complicated routing configuration of a large number of routers in the network into a centralized configuration through the controller and is delivered to the forwarding plane. , greatly simplify the maintenance of network routing. At the same time, the SDN can also enable the third-party application to conveniently control the service routing in the network through the open northbound interface. The introduction of SDN technology in the telecommunication network not only improves the automation capability of network deployment, but also implements flexible component scheduling based on services. At the same time, by introducing the SDN concept into the mobile network node (such as SAE GW), it can also effectively promote the entire network. Flattening improves the efficiency of packet forwarding. Ten, device to device communication D2D As a key candidate for 5G, Device-to-Device (D2D) has the potential to improve system performance, enhance user experience, and expand cellular communication applications. The main application scenarios of D2D include the following aspects. â— Social application: Users can find interested users in neighboring areas and perform data transmission and content sharing through D2D discovery and communication functions. â— Network traffic offload: cellular communication between neighboring users switches to D2D mode, saving air interface resources and reducing core network transmission pressure; â— IoT communication enhancement: In the scenario where there are a large number of terminals, such as the Internet of Vehicles, massive user terminals, and smart homes, the terminal accesses the specific terminal that has accessed the network in the form of D2D, and alleviates the congestion caused by the access of a large number of terminals; â— Emergency communication: When there is a blind spot in the coverage or the disaster network is damaged, the user equipment establishes a connection with the user equipment located in the coverage through D2D, thereby establishing a connection with the network in the form of D2D relay. 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