About PHS PHS network coverage optimization program-PHS, network, tower mounted
Growth in the number of users, operators need to constantly expand and upgrade the network to meet the needs of development. In the early process of construction and expansion is inevitable there will be some allocation of resources and unreasonable situation, the same time, social and economic development, urban construction and environmental changes caused by urban planning, on the existing network coverage will have an impact, which requires accordingly the local network planning and network optimization re.
1 PHS network optimization in different stages of development priorities
Run in the early stages of PHS network, network optimization to address the coverage issue-oriented, optimization of personnel needed to detect blind spots, and by increasing the base station or base stations and other measures adjusted to eliminate the blind spot; in resolving the coverage of the same time, optimizing staff should pay attention to coverage levels are reasonable, low-rise, and lack of channel it is possible, too many layers, can easily cause interference, resulting in lack of control channel base station (especially when the base station are not synchronous, the resulting interference the impact of greatly increased, while derived from other problems such as dropped calls switch).
Stage of development in the network, in addition to try to compensate for blind spots, but also concerned about the switch frequently, dropped calls and connection rate and other issues that reflect the PHS business users an intuitive experience. At present, the more common approach is through the traffic statistics and road test data, identify problems, the analysis of traffic data can be the network's overall performance and operation of all equipment indicators to assess the network, identify problems, determine network priority areas base; Way measure mainly study the location of base stations, field distribution, signal strength and quality, through the CQT (callQualityTest) and other means to correct positioning of dropped calls, switching the main reason for the incident.
When the user scale developed to a certain extent, telephone traffic tends to saturation when the quality of the network by some influence, call loss rate and higher rates of dropped calls, the user's complaint will increase, then the need to expand network capacity . Before the expansion, optimizing personnel must first do the analysis of telephone traffic hotspots, a clear understanding of existing traffic, telephone traffic in the future period of time to adequately estimate. After the optimization of network expansion should focus on a comprehensive network optimization.
At different stages of development, PHS network optimization work needs to use a variety of network optimization tools to solve the problem.
2 PHS network coverage optimization solutions
(1) increase the base station In the building by adding low-power base stations for indoor coverage blind to. This approach will resolve the coverage problem, but also to solve the capacity problem, but in great demand for large-scale building base stations, switching and increase in dropped calls, and elevators and other special occasions can not solve the coverage problem, and high cost. This approach applies to telephone traffic a higher area of small areas.
(2) the use of special antennas
For different terrain and coverage requirements, you can use a special antenna (direction angle is small, high gain directional antenna) coverage of buildings to improve indoor signal quality, can generally improve the 5-6dB. In this way less investment, simple construction, reduced switching, but can not increase system capacity, can not solve the problem indoor blind, but also affected the original base station coverage. This approach applies to the base station more closely, a weak signal level low-rise.
(3) two-way tower mounted amplifier Installed power of the tower mounted amplifier (0.5w, 2w,), can increase the indoor signal levels, generally improve the 7-10dB. In this way less investment, simple construction, reduced switching, but can not increase system capacity, can not solve the problem indoor blind, expanding the coverage of base stations, resulting in system interference.
(4) use of repeater
This way, simple construction, low investment, distribution flexibility, but the coverage is small, only to meet the needs of a client for the user less, small areas.
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