According to the latest GSA statistics, as of the end of November 2012, 113 operators in 51 countries have built LTE commercial networks, the number of LTE users has exceeded 50 million, and LTE has entered a new era of rapid development.
Compared with the traditional 2G / 3G Backhaul bearer network, the LTEhaul network has an obvious change in extension: extending downward, a new Fronthaul is generated, corresponding to four scenarios where small cells cover indoor and outdoor; extending upward to Corehaul, corresponding to Core and Backhaul networks Pull through the scene.
There are also changes in the Backhaul network itself, corresponding to the two scenarios of macro station aggregation and FMC aggregation. For the future LTE Haul bearer network, how to face the challenges of various scenarios will be the focus of operators in the LTE era.
In the Fronthaul network, indoor hotspot coverage is divided into WiFi access scenarios (Scenario 1) and LampSite scenarios (Scenario 2).
Indoor hotspot WiFi scenes are mainly concentrated in office areas, cafes, airports, etc. It is characterized by low mobility of users, few voice services, and a large number of data services. In these areas, operators face difficulties in obtaining transmission resources, a large number of remote devices need to be maintained, and high cost of Opex challenges. At the same time, bearer devices need to meet the pressure caused by bursty traffic under large capacity. This requires the backhaul network to support easy installation (plug and play), maintenance-free (access virtualization) soft capabilities, and a smaller size and lower power consumption hard capabilities
Indoor LampSite scenes are mainly concentrated in the Shopping Mall area, which is characterized by strong user mobility, large area, and a large number of voice and data services. In these areas, operators are faced with the challenge of how to ensure voice-grade service experience and rapid deployment. This requires that the backhaul network can support large bandwidth, multiple interfaces, and strong H-QoS scheduling capabilities. It can also support virtualization, easy installation, and maintenance-free to ensure users' high-quality experience under large services.
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It is a scene covered by Fronthaul outdoor hotspots, distributed on bustling pedestrian streets, city squares, and outdoor cafes. It is characterized by a complex deployment environment, no site available, and a large amount of voice and data access. For scenarios where there are street cabinet resources (optical fiber, copper wire, GPON) (Scene 3), the carrying equipment needs to support all outdoor multi-media (FE / GE, PON, etc.) access soft capabilities, while being friendly and convenient Concealed, waterproof and lightning proof, strong ability to adapt to the environment. For scenarios where no access resources are available (Scenario 4), all-outdoor microwaves need to be considered, which can be quickly deployed (spherical microwave rapid focusing), quickly turned on (USB configuration), and maintenance-free.
The traffic brought by the coverage of hotspots will eventually converge to the macro station, which will bring changes to our traditional macro station bearer. As shown in scenario 5 in the figure, the bandwidth will increase by 4 to 5 times, and it also requires higher reliability. The carrier equipment needs to provide a 10GE ring (microwaves need to use large-capacity E-band), with ring network protection capabilities, dual-master backup, and resistance to multiple points of failure. It can be shared with wireless devices in a cabinet, and plug and play supports rapid deployment. At the same time, the wireless BladeRRU, 2G / 3G frequency points are refarming to LTE, which requires that the bearing equipment also needs to have the ability of smooth evolution, greater switching capacity, and continuous upgrades to meet the future evolution of LTE / LTE-A.
After the traffic of the macro station and the small station are aggregated, they enter the transmission room. As shown in scenario 6 in the figure, the transmission room is also an access point for fixed services and a centralized management point for virtualization. This requires multi-service access (IPv6, Multicast) capability, while supporting virtualization management, larger routing specifications, while meeting 220mm deep and 2U high, can benefit the existing 300mm deep cabinets of OLT and SDH, can share cabinets, electricity and network management, achieve cost savings and fast deploy.
The EPC of LTE is on the Core, and the wireless traffic extends to the Core. At the same time, the enterprise dedicated line crosses the Backhaul and Core. The traditional Backhaul and Core network is a back-to-back solution. Without a reliable protection mechanism, it will bring long-term interruption of business. The Backhaul network needs to be considered. And Core network can provide end-to-end protection, end-to-end operation and maintenance management, and rapid service delivery, as shown in scenario seven in the figure.
From this, we can see that the future mobile bearer network is facing more application scenarios, which also brings more challenges to the traditional network. Huawei's LTEhaul solution, seven changes-oriented scenarios, matching pain points, To meet the demand, with the operator, cross-domain mobile backhaul rift.
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