Luneburg lens antenna helps the community solve the problem of high capacity load

  • Source: eahison
  • Date:09/08/2020

1、Principle of Luneburg lens antenna: by using the refraction characteristics of multi-layer dielectric sphere, the low gain and wide beam electromagnetic wave signals of a single antenna unit is converted to high gain and narrow beam electromagnetic wave signals. The working principle is similar to the focusing principle of optical lens, and its advantages are as follows:
①Focus, circle center and plane wave direction are in a straight line (narrow beam, high gain)
②Different positions have the same beam shape, which makes it easier to realize multi beam.
③Non-polarization characteristics, meet single polarization, dual polarization( ±45,Horizontal/Vertical), circular polarization
④Steep beam pattern, the interferences between adjacent beams are small, the overlapping area between adjacent beams is narrow, which is and the capacity of large capacity scene expansion is excellent
⑤With the same gain, the vertical beamwidth is about 3-4 times of the traditional panel antenna, which effectively improves the coveragerange
2、Community profile:
It is mainly a multi-storey residential area with small space between buildings and large area of residential area. Some areas have problems of weak coverage, many users complain that the Internet access signal is bad at night, and the network speed is slow.Reason: Multi-storey buildings are dense and large in area, the original base station signal is blocked seriously; besides, the base station equipment not accessible to the community. 

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3、Solution
Plan A: Improve the situation of community network through joint coverage by adding five new base stations.
Plan B: In the original site , a high gain multi-beam luneburg lens antenna is used to solve the network weak coverage problem.
The Luneburg lens antenna solution has many obvious advantages: ①Reduced usage of new sites. ② The Luneburg lens antenna has a good beam steep drop, the interference between beams is small, the overlapping area is narrow, and the capacity of large capacity scene promotion is excellent. This point is much better than the multi-site joint plan A. It is of great significance for improving signal quality and increasing capacity. ③ The Luneburg lens antenna has good coverage performance, with the same gain, the vertical wave width is about 3-4 times that of the panel antenna, which effectively improves the coverage range.

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4. Specific actions
The wideband four-beam Luneburg lens Antenna operating at 1700-2700 MHz. In order to reduce inter-cell interference and improve signal quality, the 2100MHz frequency cell and 1800MHz frequency cell are set at intervals, the figure of radiation pattern is as follows.

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5. Experimental results
Signal coverage: The overall coverage and quality in the area have been improved
RSRP: before:-89dBm   after: -85 dBm
SINR:before:8.7db      after: 9.6 db。
Load sharing:
PRB: before: 91%  after: 40%
Traffic:
before:516.1GB  after: 807.25GB
Average number of online users:
before:350    after:160

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Complaint:
before: 2 cases/day   after: 0 case/day
By using the Luneburg lens antenna to improve the community signal, the problem of deep coverage is well solved, and the 4G service traffic is greatly shared. Through user return visits and statistical comparison of complaint data, the network problems in hot complaint areas have been greatly improved. In the future, the area will be further optimized to continue to expand the base station capacity. At the same time, the solution shows the advantages of saving site resources, enhancing in-depth coverage, and greatly increasing capacity. Its experience will continue to be applied to other suitable scenarios to continue to provide reliable references for solving hot complaints.

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