4G network construction demand
According to China Mobile's goal of 4G construction in 2014, it plans to build 500,000 TD-LTE base stations before the end of the year. Up to now, the city of China Unicom and China Telecom Mixing Network has also developed from 40 cities from the initial 16 cities. With large-scale 4G network construction, the construction process also faces more and more issues.
On the one hand, from the wide range of 4G network coverage, since the coverage of the 4G base station is less than 3G base station, the LTE site in the 4G network will be more intensive. Among them, in order to meet the continuous coverage of 4G networks, it will need to create a new site in the 4G area of the existing site, and in some new site, fiber-optic resource shortages. Especially in super big cities, such as Beijing, Shanghai, Guangzhou, etc., the progress and difficulty of fiber deployment cannot meet the requirements of network construction, and mobile return network resources face huge pressure and challenges. On the other hand, from the depth of 4G network coverage, for the data hotspot area and the cover edge area, in order to improve the user's perception and experience, the Small Cell Small, based on the macro base station will be more widely deployed in the next phase 4G construction. The deployment of the Small Cell small station will be more flexible, smaller coverage, larger deployment density, and the SMALL CELL small station based return scheme has also put forward new challenges on network construction.
In the above case, domestic operators have begun to officially incorporate microwave transmission solutions into 4G network construction planning. Microwave transmission products As an important solution for mobile backhaul, due to compact, deployment, flexible installation, quick installation, and simple and other features, the global operator's network is widely deployed. As the LTE network has developed a large deployment and microwave transmission technology in the world, microwave transmission products have played a more important role in 4G networks.
Large capacity large bandwidth technology
With the development and evolution of mobile communication network, microwaves currently applied in 3G and 4G networks are mainly based on group microwave products. Thanks to the development of chip technology and system technology, and more open frequency policies and resources, the transmission capacity of group microwave products has greatly exceeded the previous generation of TDM microwave products. The modem modem mode of the most advanced microwave products can be supported by 2048QAM, compared to the modulation mode of the traditional TDM microwave up to 256QAM, the utilization efficiency of the spectrum has increased by 40%. In addition, the 56MHz or greater frequency bandwidth and the recent operator focused on the E-BAND band (80GHz) of the recent operators, the transmission capacity of the microwave product is further improved. The microwave system on the conventional frequency band is in a 2048QAM modulation method and 56 MHz bandwidth conditions, and the vocal interface service transmission capacity above 1Gbps can be implemented on one frequency through XPIC technology. In the E-BAND band, due to its rich and clean spectrum resources, large vocal interface service transmission capacity can be achieved by allocating larger bandwidth (eg 250MHz ~ 1.25GHz), such as in the E-BAND band, 256QAM modulation method and 500MHz. Under bandwidth conditions, the maximum air interface service transmission capacity is achieved.
Adaptive modulation technology and QoS function
For the business characteristics of the 4G mobile network, the microwave transmission device receives the various fading in the transmission process by adaptive modulation demodulation. When the transmission environment and conditions deteriorate, the performance of the microwave system is changed by modifying the modem. Thus the normal transmission of the business. The bandwidth variation caused by modulation demodulation changes, through the QoS function of the microwave system, to achieve classification processing of different priority services. 8 levels of QoS mechanisms within the microwave device, including classification, scheduling, shaping, conflict avoidance mechanism, etc., can achieve more refined and flexible to 4G services. Through the adjustment of the length of each business queue, you can optimize the delay and throughput of business transmission according to the type and nature of different services.
V-BAND microwave product application
According to the global V-Band (60GHz) microwave product deployment, the main advantage is that this frequency band can be used free of use, which reduces the spectral occupation fee; 400Mbps or more business throughput can be supported in 256QAM modulation modification. In addition, since the oxygen attenuation in the V-BAND band is very large, the microwave transmission distance is very limited (up to about 300m), so the frequency multiplexing efficiency of the V-BAND microwave is very high, and the frequency interference between the microwave transmission link is very limited, very Suitable for returning solutions for the Smallcell small station as a densely deployed SMALLCELL station. Currently, NEC has commercially used V-Band microwave products to be deployed in multiple operators networks in five countries. This product is very high, using all outdoor product structure, built-in high gain flat antenna, microwave product is only 5kg, which is ideal for deployment under various environmental conditions, including street, wall, rod, bus stop, Newsletter, etc.
High integration, low power consumption
With the comprehensive deployment and rapid construction of 4G networks, power consumption has become one of the largest problems in network construction, which will be very huge due to the network operation and maintenance expenses brought about by equipment. On the basis of radio frequency technology and process development, the new generation of microwave products is increasing, and the structure is simpler and miniaturized to further reduce the power consumption of microwave products. Among them, NEC has published the first super compact and miniaturized palm-type microwave outdoor unit (IAG / IAP ODU) in 2013, regardless of the volume, weight or power consumption Comprehensively transcend the same products in the current market. Compared to the microwave products before NEC, the new outdoor unit (ODU) reduces the volume by one-third, the weight is reduced by one, only 2kg; power consumption is at least 30%, the lowest is only 18W.
Fronthaul microwave solution
A new generation of microwave products can already be easily implemented with a Gigabit rate transmission capacity. With the development of microwave technology and the opening of new spectrum resources, the transmission capacity of microwave products will be further improved, and the types of products are more varied, and microwave application scenarios is also more extensive. Relying on the stable and reliable performance and large capacity of microwave products, NEC released the CPRI microwave product of the first E-BAND band in 2014, and applied to the baseband processing unit (BBU) and RF (RRU) for distributed base stations. The wireless connection between the mobile network is provided back to a new outdoor solution. NEC's CPRI microwave product has reached 2.5Gbps, which can meet the rate requirements of CPRI VER5.0 OPTION-3 (2457.6MBPS), and provide standard CPRI service interfaces, which can be used to resolve multi-channel transfer schemes for BBU + RRUs. The introduction of CPRI microwave products makes operators' mobile network construction more diverse, and the structure of the network is more flexible.
Diverse products, advanced technology and function, stable system performance, simple and compact structure and ultra-low power consumption, powerful environmental adaptability, deployment, easy to install, so that microwave products are important in mobile transmission network construction The transmission means is generally emphasized by operators. During the domestic future 4G network construction, microwave products will also grow an important role, providing more choices for various operators' network construction and improving the efficiency of network construction.
Be
Source: with non-net
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