Pan-European eCall employing AMR-WB and LTE CSFB

Abstract:
The 3GPP/CEN standard for pan-European in-vehicle emergency call service (eCall) [1-7] which is envisioned to be used over automatic mobile 112 calls in radio networks across Europe, is currently investigated in many European countries in the context of the Harmonized eCall European Pilots (HeERO) to support its smooth introduction and to reveal any potential improvements [8]. An extensive field test campaign has been conducted by Qualcomm in 15 countries throughout Europe to assess the performance of a commercially available eCall implementation in 48 mobile networks [10-13]. This paper highlights additional results obtained for eCall when networks configure wide-band adaptive multi-rate (AMR-WB) speech codecs. Herewith, potential performance improvements with modified codec inversion detector (CID) algorithms can be demonstrated. In addition, eCall performance results are shown for Long Term Evolution (LTE) networks using circuit-switched fallback (CSFB) mechanisms to transition to either 2G or 3G CS domain in order to establish eCalls.