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Context. Blazars are among the most energetic objects in the Universe. In2008 August, Fermi/LAT detected the blazar PKS 1502+106 showing a rapid andstrong gamma-ray outburst followed by high and variable flux over the nextmonths. This activity at high energies triggered an intensive multi-wavelengthcampaign covering also the radio, optical, UV, and X-ray bands indicating thatthe flare was accompanied by a simultaneous outburst at optical/UV/X-rays and adelayed outburst at radio bands.  Aims: In the current work we explore the phenomenology and physicalconditions within the ultra-relativistic jet of the gamma-ray blazar PKS1502+106. Additionally, we address the question of the spatial localization ofthe MeV/GeV-emitting region of the source.  Methods: We utilize ultra-high angular resolution mm-VLBI observations at 43and 86 GHz complemented by VLBI observations at 15 GHz. We also employsingle-dish radio data from the F-GAMMA program at frequencies matching theVLBI monitoring.  Results: PKS 1502+106 shows a compact core-jet morphology and fastsuperluminal motion with apparent speeds in the range 5--22 c. Estimation ofDoppler factors along the jet yield values between ~7 up to ~50. This Dopplerfactor gradient implies an accelerating jet. The viewing angle towards thesource differs between the inner and outer jet, with the former at ~3 degreesand the latter at ~1 degree, after the jet bends towards the observer beyond 1mas. The de-projected opening angle of the ultra-fast, magnetically-dominatedjet is found to be (3.8 +/- 0.5) degrees. A single jet component can beassociated with the pronounced flare both at high-energies and in radio bands.Finally, the gamma-ray emission region is localized at less than 5.9 pc awayfrom the jet base.

PKS 1502+106: A high-redshift Fermi blazar at extreme angular resolution. Structural dynamics with VLBI imaging up to 86 GHz