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Narrowband-physical random access channel techniques

  • US 10,383,151 B2
  • Filed: 12/23/2015
  • Issued: 08/13/2019
  • Est. Priority Date: 07/17/2015
  • Status: Active Grant
First Claim
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1. Electronic device circuitry for a user equipment (UE) configured to use a narrowband (NB) bandwidth when performing random access of a cellular network associated with an evolved Node B (eNB) providing the NB bandwidth at a frequency band of a repurposed deployment using global systems for mobile communications (GSM) spectrum, an in-band deployment using a physical resource block (PRB) of a larger-bandwidth long term evolution (LTE) system, or a guard-band deployment using a guard band of the larger-bandwidth LTE system, the electronic device circuitry comprising:

  • control circuitry configured to generate an NB-physical random access channel (NB-PRACH) defined by an NB-PRACH physical structure and an NB-PRACH numerology;

    the NB-PRACH physical structure including a cyclic prefix (CP), a guard time (GT), and an NB-PRACH sequence between the CP and the GT; and

    the NB-PRACH numerology configured to size components of the NB-PRACH physical structure such that a beginning of the CP and an end of the GT temporally correspond with a beginning and an end of one or more LTE subframes that each have a one millisecond (1 ms) duration, and the NB-PRACH numerology configured to maintain a number of subcarriers at a subcarrier spacing to establish the NB-PRACH as having an NB-PRACH bandwidth within the NB bandwidth,wherein the control circuitry is further configured to randomly select one NB-PRACH preamble signature and a scheduling request (SR) transmission opportunity for transmission of the NB-PRACH and an SR within one LTE subframe.

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