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Data Collection: 1.1 Coverage Problem Types 1.1.1 Weak Coverage

The document discusses data collection methods for radio frequency (RF) optimization. It describes collecting scanner and user equipment (UE) data through drive tests (DT) and indoor testing to analyze coverage, handover, and pilot pollution problems. Indoor testing focuses on important indoor areas like buildings, stores, and subways as well as important facilities and operator-required areas. The tests aim to locate, analyze, and solve RF problems. Coverage problem analysis is also key to RF optimization and involves analyzing issues like weak coverage, cross-cell coverage, unbalanced uplink and downlink, and missing primary pilot cells. Weak coverage can occur in valley, hillside, elevator wells, tunnels, garages, basements, and

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Agus Andriyas
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50 views2 pages

Data Collection: 1.1 Coverage Problem Types 1.1.1 Weak Coverage

The document discusses data collection methods for radio frequency (RF) optimization. It describes collecting scanner and user equipment (UE) data through drive tests (DT) and indoor testing to analyze coverage, handover, and pilot pollution problems. Indoor testing focuses on important indoor areas like buildings, stores, and subways as well as important facilities and operator-required areas. The tests aim to locate, analyze, and solve RF problems. Coverage problem analysis is also key to RF optimization and involves analyzing issues like weak coverage, cross-cell coverage, unbalanced uplink and downlink, and missing primary pilot cells. Weak coverage can occur in valley, hillside, elevator wells, tunnels, garages, basements, and

Uploaded by

Agus Andriyas
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Data Collection

During RF optimization stage, the key is the optimization of radio signals distribution, with the major means of DT and indoor test. Before test, confirm with the customer care engineers the following aspects: _ Whether the target NodeBs, RNCs, and related CN are abnormal due to being disabled, blocked, congested, and transmission alarms. _ Whether the alarms have negative impact on the validity of test result data. If the alarms exist, solve the problems before test. DT is a major test. Collect scanner and UE data of radio signals by DT test. The data is applicable in analyzing coverage, handover, and pilot pollution problems. Indoor test involves the following areas: _ Indoor coverage areas Indoor coverage areas include inside buildings, department stores, and subways. _ Inside areas of important facilities Inside areas of important facilities include gymnasiums and government offices. _ Areas required by the operator :Areas required by the operator include VIC and VIP. Test the previous areas to locate, analyze, and solve the RF problems. Indoor test also involves in optimizing handover of indoor and outdoor intra-frequency, inter-frequency, and inter-system. The DT and indoor test during RF optimization stage is based on VP service. According to the contract (commercial deployment offices) and planning report (trial offices), if seamless coverage by VP service is impossible in areas, such as, suburban areas and rural areas, the test is based on voice services. For areas with seamless coverage by PS384K service or HSDPA service required by the contract (commercial deployment office) or planning report (trial office), such as office buildings, press centers, and hot spot areas, the test is based on the above services.

Coverage Problem Analysis


Coverage problem analysis is key to RF optimization. It involves signal distribution. The coverage problems to be analyzed include: _ Weak coverage _ Cross-cell coverage _ Unbalance uplink and downlink _ No primary pilot cell

1.1 Coverage Problem Types 1.1.1 Weak coverage


_________ __ Weak coverage refer to that the RSCP of pilot signals in a coverage area is smaller than 95 dBm. It might be in: _ Valley areas _ Hillside back _ Elevator well _ Tunnel _ Underground garage _ Basement _ Areas inside high buildings If the pilot signals are weaker than that required by full coverage services (such as VP and PS64K), or just meet the requirements, if the PICH Ec/Io cannot meets the lowest requirements on full coverage services due to increased intra-frequency interference, problems like difficult access of full coverage services will occur. If the RSCP of pilot signals is weaker than that of minimum access threshold in a coverage area, the UE cannot camp on the cell, so the UE drops off the network due to failing in location updating and location registration.

_____ __ For previous problems, use the following methods: _ Increase pilot transmit power, adjust antenna down tilt and azimuth, increase antenna height, use antennas with higher gain to optimize coverage. _ If subscribers are abundant in the non-overlapped areas of neighbor NodeBs or the nonoverlapped areas are great, construct new NodeBs or expand the coverage range of neighbor NodeBs. This ensures a software handover area with enough great size. Pay attention to that increasing of coverage areas might cause intra-frequency and inter-frequency interference. _ Construct new NodeBs or add RRU in valley and hillside back areas with weak coverage to expand coverage range. _ Use RRU, indoor distributed system, leakage cable, and directional antenna to solve problems in signal dead zone like elevator well, tunnel, underground garage, basement, areas inside buildings.

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