Verbesserung des Wahlfreien Zugriffs für 5G-Luft-Boden-System

Details

Veröffentlichungs-Nr.

EP4161204

Aktenzeichen

EP21200340

Anmeldetag

30. September 2021

Veröffentlichung

9. Juli 2025

Erteilung

9. Juli 2025

Rechtsraum

EP

IPC

H04W74/0833H04W56/00

Abstract

The invention relates to an iterative method for accessing a cellular communications network by a transceiver equipment, said transceiver equipment transmitting at least one PRACH preamble with a Timing Advance Offset (TAO) comprising t₀, ..., t_k-1, t_k, ..., t_n over a Random Access Channel to a base station serving a maximum cell range C, said PRACH preamble being a long sequence PRACH preamble supporting a cell range of r kilometres which is less than the maximum cell range C, characterised in that the method comprises the steps of: a. transmitting the PRACH preamble with an initial starting TAO t₀, said starting TAO t₀ being calculated by the transceiver equipment depending on the maximum cell range C, and b1. determining a valid Random Access Response being received within a predetermined waiting interval, or b2. determining no valid Random Access Response being received within a predetermined waiting interval and transmitting the PRACH preamble with a k^th TAO t_k, said k^th TAO t_k being calculated by adding and/or subtracting a multiple of t as being a function of r to a preceding TAO t_k-1, and b3. repeating steps b1 and b2 until a valid Random Access Response is being received. Moreover, the invention relates to a related iterative method for handover from the base station serving the maximum cell range C to a base station serving a maximum cell range C1, and to a transceiver equipment comprising means for carrying out the iterative method as well as to a computer program product comprising instructions to carry out the iterative method and to a data carrier signal carrying the computer program product.

Anmelder

Firma

SkyFive AG

Land

🇩🇪 Deutschland

Fachgebiete