Femto technology helps China's information integration
In 2009, Femto began to enter the emerging 3G market in China. Full-service operators, Huawei, Alcatel-Lucent, Nokia Siemens and other suppliers fully verified the Femto solution in multiple locations and multiple scenarios. Looking at various factors such as cost, coverage, and capacity, Femto has fully demonstrated its comprehensive advantages as a new 3G network coverage supplementary solution.
Femto is an ultra-miniaturized mobile device launched in recent years based on the development of 3G and mobile broadband. It can make full use of the existing broadband access resources of users, complement the deep coverage and data capacity of 3G networks, and in the true sense will be wired Broadband services and mobile phone services have been effectively integrated. With the 3G wave sweeping the world, Femto has been favored by global operators. It will become an important strategic product and service solution for full-service operators under the trend of 3G and network convergence.
1. Research results of key issues in Femto network deployment
In response to a series of problems such as frequency interference, mobility management, network management and operation and maintenance, and possible impact on the existing network after the introduction of Femto, China Unicom organized a series of tests such as infield, outfield, and IOT, and After the actual application verification in the scenarios of Beijing residential area, Tianjin university campus, Shanghai Pudong Development Bank and other scenarios, it shows that Femto has the technical conditions for commercial use in China.
1. Frequency interference
Theoretical analysis and test conclusions show that Femto and the same system 3G network use different frequency point networking, and there is almost no interference with each other. The interference between Femto of the same standard can be solved in the family scenario through Femto automatic scrambling code allocation and automatic transmission power adjustment. Femto interference between adjacent families is very small and does not affect the user experience; Femto in the enterprise scenario It can be effectively avoided by automatically acquiring the parameters of the neighboring cell and automatically configuring the neighboring cell relationship to realize the unique soft handover characteristics of 3G.
The conclusion of the test research also shows that the introduction of Femto can improve the 3G indoor coverage level and reduce the mobile phone transmission power, thereby reducing the electromagnetic radiation of the mobile phone, so that users can use green 3G services with greater confidence.
2. Mobility management
Femto will adopt the same mobility strategy when introducing 2G network into 3G network coverage, that is, preferentially stay in Femto, and reselect with bidirectional 3G network in idle state, and unidirectional handover with 3G network in call state.
The conclusion of the test research shows that the handover between Femto and 3G network is a hard handover based on MSC, and the actual test success rate is better than the 3G to 2G different system handover. During large-scale deployment, a unified virtual neighbor (more than 4) and unified Femto reselection parameters can be configured on the 3G network to implement the above mobility strategy. The above configuration requires a small amount of 3G network coordination workload and has no effect on the 3G network KPI.
3. Management and operation and maintenance
Femto is positioned as a product form of fixed and mobile convergence. Its management and maintenance mode has been clearly defined in 3GPP R8. It will adopt the same management method as the massive devices such as home gateways: passive maintenance, and some Femto adopt active maintenance ( Such as important users and high-end users). In addition, the concept of an AP area can be established to achieve unified management of the same area, such as unified delivery of area configuration parameters and batch upgrades for APs in the area to improve operation and maintenance efficiency.
Femto connects with the upper layer network management through the northbound interface to realize unified network management, unified monitoring and maintenance with the 3G macro network.
4. Impact on Macro Network
Femto improves 3G coverage in the application area. When there is no 3G signal coverage in the application area, users can access Femto to enjoy normal 3G services and improve the user experience of the 3G network. When the application area originally has 3G signal coverage, Femto provides independent 3G capacity can improve the experience of higher-speed 3G data services.
While improving regional coverage, Femto absorbs 3G services in the region and realizes traffic distribution for 3G networks, thereby promoting the 3G network to maintain a benign load state at any time, improving the coverage reduction problem brought by the breathing effect of the 3G system, and beneficial to 3G networks Continue to provide users with quality services.
The introduction of Femto will increase the signaling load brought by the location area update. Through analysis of different deployment scenario areas, when the number of Femto devices on the local network reaches tens of thousands of levels, the signaling will increase within 5%, relative to the current There is the processing capacity of the core network, which has a small impact and is within an acceptable range.
The test and research conclusions show that the introduction of Femto has improved the overall 3G network KPI capability, improved 3G spectrum utilization, greatly increased the capacity of 3G wireless air interface, and reduced the deployment cost of the network to improve coverage and capacity.
2. The Femto industry is maturing day by day
Femto standardization is accelerating. In April 2009, 3GPP has formulated the WCDMA Femto standard; the CDMA2000 Femto standard has also been launched by 3GPP2; and the TD-SCDMA Femto standard is under development. The China Unicom Femto Enterprise Standard has been released.
The Femto industry chain organization continues to expand. The companies currently involved in the Femto industry include the entire upstream and downstream of the mobile communications industry chain. There are currently 117 member companies in the forum, including 52 operators and 65 suppliers. The chip has formed a diversified supply trend, and five internationally renowned chip manufacturers including Qualcomm and Huawei can already provide Femto chip solutions.
With the maturity of the industrial chain, Fetmo has become the strategic deployment focus of telecom operators. Up to now, there are 8 overseas operators commercial Femto, Vodafone will soon be fully commercialized on its subnet. Overseas operators provide a variety of Femto business model experience, which will help Chinese operators to explore and develop the Femto converged business model with Chinese characteristics, bringing a rich and high-quality convergent experience to Chinese 3G users.
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