| Articles for the deployment of 3G networks | | | | indoor distribution system. And according to plan, |
| important?? Indoor distribution system construction, | | | | NTTDoCoMo indoor coverage building efforts will |
| distribution system source selection, selection of | | | | continue to increase. |
| transmission media of several key strategies were | | | | In 3G network construction plan, mobile operators in |
| assessed, and the multi-system shared 2G indoor | | | | China to be a high degree of indoor coverage |
| distribution system in the coverage and capacity of | | | | concern, explicitly put forward the goal of this |
| the overall consideration and combiner, feeders and | | | | coverage: 1 ~ 2 years in time to make 3G indoor |
| other distribution system devices to share and | | | | coverage to 3G existing 2G coverage area indoor |
| update the issues put forward some constructive | | | | coverage levels. This hope is a good target is correct, |
| comments. | | | | but there is still much to implement the specific |
| Currently, 3G operators abroad, fully aware of the | | | | problems to be solved. The following discussion on |
| importance of indoor distribution system, have put a | | | | some key issues. |
| lot of manpower and resources to conduct research | | | | 2,3 G indoor distribution system source selection |
| and build indoor coverage. Since China has not yet | | | | In accordance with the signal source, indoor coverage |
| truly 3G commercial network, indoor coverage in 3G | | | | solutions that can be divided into macrocell base |
| is still at the exploratory stage. | | | | stations, micro-cellular base stations, radio base |
| In this article, the author engaged in mobile | | | | stations and repeaters, etc. pull away. |
| communication according to the experience of | | | | Present, the domestic use of 2G network coverage |
| planning, the 3G indoor coverage of the major issues, | | | | is the largest indoor directional antenna increases |
| including the choice of distribution system source, | | | | macrocell base station, the method is mainly used for |
| transmission medium of choice and multi-room | | | | sealing the building or buildings less than the thin |
| distribution system shared 2G system, combined with | | | | areas, implementation is the antenna directly at the |
| South Korea's SKT, SUNDAY, etc. have been | | | | target building coverage and level of use of narrow |
| established in Hong Kong 3G mobile network | | | | width half-power angle of the vertical lobe of the |
| operators in the actual network construction and | | | | antenna and the appropriate antenna output power, |
| experience in the relevant measures, some | | | | the advantage of outdoor macrocell base station |
| conclusions. | | | | coverage area can also provide indoor coverage, the |
| 1, the importance of indoor coverage | | | | network resources for both indoor and outdoor |
| Mainly with the current 2G network traffic from | | | | customer service; shortcomings are evident, the |
| outside the situation is different, 3G network traffic | | | | method can not ensure full coverage inside buildings |
| from the main room. In accordance with the business | | | | and can not improve the frequency reuse in degrees. |
| of data collection SUNDAY results suggest, 3G | | | | In the 3G network, the macrocell mode of use may |
| services indoors speaker volume more than half of | | | | be reduced. As mentioned earlier, 3G network, a |
| the total volume of the speaker. The NTTDoCoMo's | | | | considerable volume of business generated in the |
| 3G commercial network users distribution statistics | | | | interior, and features a high-speed 3G data services |
| show that about 70% of the volume of business | | | | required receiver sensitivity than voice services, if still |
| from the room. 3G commercial network, statistical | | | | using outdoor macro base station to ensure the |
| analysis of user distribution in Figure 1, while the | | | | quality of indoor coverage, then the inevitable |
| indoor telephone traffic details shown in Figure 2. | | | | outdoor base stations will reduce the distance, |
| Figure 1 3G commercial network, statistical analysis of | | | | thereby increasing the number of outdoor station; In |
| user distribution | | | | addition, because there are more serious high-level |
| Figure 2 indoor telephone traffic details | | | | pilot pollution, if the top part of tall buildings to |
| Therefore, improving indoor coverage, not only to | | | | provide services from the outdoor macro base |
| business users a better user experience, can also be | | | | station, then the user will receive from the |
| spread through close regional network of pressure, | | | | surrounding more than one base station equipment |
| but also network with other operators compete for | | | | generates strong interference, this time, the user if |
| indoor telephone traffic. To be sure, indoor 3G | | | | you want to call, then end the need for greater |
| coverage is improving the success of one of the key | | | | power, which means more interference will be |
| factors. | | | | generated, leading to decline in the quality of the |
| However, as 3G working in the VHF band, and the | | | | communication. |
| wave diffraction ability, through loss, so the | | | | However, some specific conditions that need to be |
| network's in-depth coverage flawed. And compared | | | | achieved through the outdoor base stations, indoor |
| to the current 2G networks, 3G networks there will | | | | coverage. SUNDAY in Hong Kong 3G indoor coverage |
| be more weak signal areas, especially in building | | | | problems are more representative. Hong Kong high |
| interiors, the existence of blind spots is more easily | | | | rise (an average of 630 per square kilometer |
| broken, unstable network performance shortcomings. | | | | high-rise, on average 45 meters tall), difficult |
| South Korea's largest mobile communications operator | | | | negotiations with the owner, long period of high |
| SKT based network management data and the | | | | rental costs. As a Hong Kong one of the smallest |
| annual two national user survey, as well as handling | | | | mobile operator, SUNDAY simply can not afford |
| customer complaints result, reached a conclusion: the | | | | high-rise in construction in most indoor coverage |
| location of the poor quality of most services are | | | | distribution system. Therefore, to ensure focus on |
| indoors, and most of It is because the user | | | | the basis of indoor coverage, SUNDAY in most cases |
| dissatisfaction with the complaints arising. Therefore, | | | | are based on the outdoor base station + directional |
| 3G 2G earlier than required, a more comprehensive | | | | antenna means to achieve indoor coverage. Of which: |
| deployment of indoor coverage. | | | | (1) high indoor coverage is often the dumping by the |
| Currently, all major mobile operators for the | | | | wider sector and vertical beam of small antennas to |
| construction of the strategic significance of indoor | | | | achieve. |
| coverage has a very clear understanding of the | | | | (2) low-level indoor coverage is to use a small |
| building is sparing no effort. As of third quarter of | | | | antenna is often the way to the lower inclined |
| 2005, NTTDoCoMo to 30% of the base station | | | | completed. |
| resources for indoor coverage, scale up the 3800 | | | | |