As part of its ongoing tests inside and around the convention center this week, Global Wireless Solutions (GWS) on Tuesday morning performed a follow-up test to its Monday baseline.

GWS engineers are using specially equipped backpacks tomonitor the performance of the four major wireless national carriers inside the convention center as their networks get more and more loaded with traffic as the week progresses.

Testing of the voice networks showed that Sprint and Verizon Wireless now occupy the top tier, withAT&T dropping behind along with T-Mobile. However, download throughput tests showed that T-Mobile’s and AT&T’s HSPA+networks pulled ahead of Verizon’s LTE network, which continues to exhibit variations in its delivered throughput.

GWS says Verizon was the only carrier to fail multiple download requests. Sprint’s EV-DO network showed the strain of theload with the largest degradation of all carriers from the baseline test. With regards to uplink speeds,Verizon’s LTE network performed well. AT&T, Sprint and T-Mobile all had difficulty completing the upload tasks.

Engineers in the GWS van continued to perform mobile testing along the roadways and parking lots surrounding the convention center. The voice performance outside for MetroPCS, Sprint and Verizon improved such that no failed callsoccurred, whereas AT&T and T-Mobile both still failed a single call each. 

The Verizon LTE network still exhibitedmore stability and consistency outdoors, and it entered into a category of its own in delivered throughput. T-Mobile and AT&T were in the next throughput tier, but T-Mobile continued (from Monday) the tendency to notcomplete tasks. The Sprint EV-DO and Verizon EV-DO networks came in behind T-Mobile and AT&T. Clearwire clearlystruggled to handle the load, and failed almost all tasks.