Archive 2016

RF Field data and playback

RF Field data and playback

Field RF and Data Playback

Companies as Spirent Communications use tools to collect RF data and play it back for testing again. Companies are looking for ways to capture “Drive Test” RF data as RSSI and use fading models to replay certain Physical level conditions that trigger what modulation mode the phone will be used. At the same time, the RF will trigger switching on bandwidth and bit rates, power transmission, and battery usage.

One interesting tools is called Live2Lab, a tool that handles capture of data and playback in the SR5500 Wireless Channel Emulator, and other tools that combined can provide a full test for switched calls, VoLTE calls, applications, and data.

Companies like ROHDE & SCHWARZ, AeroFlex, and others provide similar environments for testing.

In summary, RF data is captured from the field (via “Drive Test Tool”) and then converted or imported to a format that can be played back to the handset or handsets, once the data from 1-10 sectors is known, the base station signaling can be emulated in a form that the handsets perceives the drive test.

Importance of Wireless Emulation

Importance of Wireless Emulation

Importance of Wireless Emulation: Apple Antenna Lab

According to news agencies, Apple has invested over $100M in its advanced antenna design and test labs, where apple engineers log thousands of hours testing and validating iPhones and iPads among other devices with 3G/4G capabilities.

Data indicated by Engadget in an article pointed out that:

” Ruben informed us that this particular chamber would run you about $1.2 million US dollars.”

Quoting Ruben Caballero one of Apple’s RF engineers (Source

In a different article from WIRED magazine:

“The difference with Apple is it built its own lab for the sake of having full, granular oversight on the design (and redesign) of its products. Prototypes go through several iterations and tests before they’re finalized into Apple products. (Of course, having its own lab also helps Apple better guard its secrets.) Source: