Indoor Distribution System Solution 3g-3g, Distribution, Solution - Hc Network Communication

Articles for the deployment of 3G networks important

?? Indoor distribution system construction, distribution system source selection, selection of transmission media of several key strategies were assessed, and the multi-system shared 2G indoor distribution system in the coverage and capacity of the overall consideration and combiner, feeders and other distribution system devices to share and update the issues put forward some constructive comments.

Currently, 3G operators abroad, fully aware of the importance of indoor distribution system, have put a lot of manpower and resources to conduct research and build indoor coverage. Since China has not yet truly 3G commercial network, indoor coverage in 3G is still at the exploratory stage.

In this article, the author engaged in mobile communication according to the experience of planning, the 3G indoor coverage of the major issues, including the choice of distribution system source, transmission medium of choice and multi-room distribution system shared 2G system, combined with South Korea's SKT, SUNDAY, etc. have been established in Hong Kong 3G mobile network operators in the actual network construction and experience in the relevant measures, some conclusions.

1, the importance of indoor coverage

Mainly with the current 2G network traffic from outside the situation is different, 3G network traffic from the main room. In accordance with the business of data collection SUNDAY results suggest, 3G services indoors speaker volume more than half of the total volume of the speaker. The NTTDoCoMo's 3G commercial network users distribution statistics show that about 70% of the volume of business from the room. 3G commercial network, statistical analysis of user distribution in Figure 1, while the indoor telephone traffic details shown in Figure 2.

Figure 1 3G commercial network, statistical analysis of user distribution

Figure 2 indoor telephone traffic details

Therefore, improving indoor coverage, not only to business users a better user experience, can also be spread through close regional network of pressure, but also network with other operators compete for indoor telephone traffic. To be sure, indoor 3G coverage is improving the success of one of the key factors.

However, as 3G working in the VHF band, and the wave diffraction ability, through loss, so the network's in-depth coverage flawed. And compared to the current 2G networks, 3G networks there will be more weak signal areas, especially in building interiors, the existence of blind spots is more easily broken, unstable network performance shortcomings. South Korea's largest mobile communications operator SKT based network management data and the annual two national user survey, as well as handling customer complaints result, reached a conclusion: the location of the poor quality of most services are indoors, and most of It is because the user dissatisfaction with the complaints arising. Therefore, 3G 2G earlier than required, a more comprehensive deployment of indoor coverage.

Currently, all major mobile operators for the construction of the strategic significance of indoor coverage has a very clear understanding of the building is sparing no effort. As of third quarter of 2005, NTTDoCoMo to 30% of the base station resources for indoor coverage, scale up the 3800 indoor distribution system. And according to plan, NTTDoCoMo indoor coverage building efforts will continue to increase.

In 3G network construction plan, mobile operators in China to be a high degree of indoor coverage concern, explicitly put forward the goal of this coverage: 1 ~ 2 years in time to make 3G indoor coverage to 3G existing 2G coverage area indoor coverage levels. This hope is a good target is correct, but there is still much to implement the specific problems to be solved. The following discussion on some key issues.

2,3 G indoor distribution system source selection

In accordance with the signal source, indoor coverage solutions that can be divided into macrocell base stations, micro-cellular base stations, radio base stations and repeaters, etc. pull away.

Present, the domestic use of 2G network coverage is the largest indoor directional antenna increases macrocell base station, the method is mainly used for sealing the building or buildings less than the thin areas, implementation is the antenna directly at the target building coverage and level of use of narrow width half-power angle of the vertical lobe of the antenna and the appropriate antenna output power, the advantage of outdoor macrocell base station coverage area can also provide indoor coverage, the network resources for both indoor and outdoor customer service; shortcomings are evident, the method can not ensure full coverage inside buildings and can not improve the frequency reuse in degrees.

In the 3G network, the macrocell mode of use may be reduced. As mentioned earlier, 3G network, a considerable volume of business generated in the interior, and features a high-speed 3G data services required receiver sensitivity than voice services, if still using outdoor macro base station to ensure the quality of indoor coverage, then the inevitable outdoor base stations will reduce the distance, thereby increasing the number of outdoor station; In addition, because there are more serious high-level pilot pollution, if the top part of tall buildings to provide services from the outdoor macro base station, then the user will receive from the surrounding more than one base station equipment generates strong interference, this time, the user if you want to call, then end the need for greater power, which means more interference will be generated, leading to decline in the quality of the communication.

However, some specific conditions that need to be achieved through the outdoor base stations, indoor coverage. SUNDAY in Hong Kong 3G indoor coverage problems are more representative. Hong Kong high rise (an average of 630 per square kilometer high-rise, on average 45 meters tall), difficult negotiations with the owner, long period of high rental costs. As a Hong Kong one of the smallest mobile operator, SUNDAY simply can not afford high-rise in construction in most indoor coverage distribution system. Therefore, to ensure focus on the basis of indoor coverage, SUNDAY in most cases are based on the outdoor base station + directional antenna means to achieve indoor coverage. Of which:

(1) high indoor coverage is often the dumping by the wider sector and vertical beam of small antennas to achieve.

(2) low-level indoor coverage is to use a small antenna is often the way to the lower inclined completed.

As a last resort and outdoor base stations, indoor directional antenna increases coverage not ideal, this approach can not solve the signal blind spots and weak areas, the more important, it will follow-up Network optimization has brought a lot of pressure

by: gaga

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