Vecta both performs and trains best practice investigation, remediation and acceptance of legacy sites, macro, small cell, IBC and other RF infrastructure.

Social media platforms and the sharing of content over wireless networks has led to an explosion of data consumption globally. To capture and serve this ever-expanding market, Operators have deployed new technologies and expanded networks at a frantic pace. As a result of these accelerated deployments, site planning, design and construction are often not scrutinised to the required level of quality to ensure network performance. Vecta performs best practice investigation, remediation and acceptance of legacy and new sites ensuring that cells sites are correctly constructed and are delivering the performance needed to serve subscribers.

Site Testing (On-site verification – Macro and IBC)

Investigation of legacy sites including:

  • Physical assets
  • Review of KPI data to identify signatures for fault conditions (PIM, Antenna pointing etc)
  • Drive Test at peak and low traffic times. All frequency bands and technologies. Extensive post processing of data
  • Measurement of site performance parameters
    • Antenna elevation / azimuth / height. Site block diagram & asset classification.
    • Dynamic PIM testing of RF path at site and fault identification
  • Measurement of site interference
    • KPI data used to predict likely external interference
    • External sources of interference identified
  • Failure identification
  • Corrective actions
  • Training of Operator’ staff
  • Reports and documentation
    • Compilation of all data into comprehensive report. Included findings, recommendations and possible preventative measures

Although operators claim they can measure and identify high levels of PIM at a site through Radio On-Board PIM Measurements, this method has some shortcomings.

Passive Intermodulation (PIM) measured on site versus Radio On-Board PIM Measurement

  • Radio on-board PIM tool can identify some PIM problems
  • RRU transmit bandwidth limits PIM measurement in some bands
  • No dynamic testing (IEC 62037) requires dynamic PIM
  • Faster test and rectification cycle with portable PIM equipment
  • Distance to PIM available with portable PIM equipment
  • Skilled PIM engineer more effective in audit and improvement

antenna_alignment_graph

Antenna Alignment

A 6,000 sector Antenna Alignment audit found that 2,500 Antennas were out of tolerance. Other field trials show between 20-40% of antennas suffer misalignment.

Misaligned antennas can increase dropped calls and reduce throughput:

  • Weak coverage areas
  • Lack of a dominant cell
  • Cross-coverage or islands
  • Co-channel interference
  • Handover success problems