Detection of hopping channel for unlicensed internet of things
Technology for a next generation node B (gNB) operable for frequency hopping in MulteFire communications is disclosed. The gNB can perform a clear channel assessment (CCA) for a selected hopping frequency. The gNB can identify a next hopping frequency in a set of hopping frequencies when an energy detection of the CCA is greater than a selected threshold. The gNB can encode data for a downlink transmission at a selected dwell time of a determined hopping frequency in the set of hopping frequencies when an energy detection of the CCA is less than a selected threshold.
1. An apparatus of a next generation node B (gNB) operable for frequency hopping in MulteFire communications, the apparatus comprising:
one or more processors configured to:
perform a channel access procedure for a selected hopping frequency;
identify a next hopping frequency in a set of hopping frequencies when an energy detection of the channel access procedure is greater than a selected threshold;
encode data for a downlink transmission at a selected dwell time of a determined hopping frequency in the set of hopping frequencies when an energy detection of the channel access procedure is less than a selected threshold; and
encode a detection signal located after the channel access procedure, wherein the detection signal comprises one or more cell-specific reference signals (CRSs) and is to be transmitted in a plurality of orthogonal frequency division multiplexing (OFDM) symbols without additional data in the OFDM symbols to enable power to be allocated to the transmission of the one or more reference signals; and
a memory interface configured to send the set of hopping frequencies to a memory.
2. The apparatus of claim 1 , wherein the one or more processors are further configured to:
decode data in an uplink transmission at one of the selected hopping frequencies.
3. The apparatus of claim 1 , wherein the one or more CRSs have a Zadoff-Chu structure.
4. The apparatus of claim 1 , wherein the one or more processors are further configured to:
encode the data for the downlink transmission in a data segment of the selected dwell time of the determined hopping frequencies in the set of hopping frequencies, wherein the data segment has a length of 75 milliseconds (ms) and the dwell time has a length of 80 ms.
5. The apparatus of claim 1 , wherein the one or more processors are further configured to:
encode one or more cell-specific reference signals (CRSS) in the downlink transmission within the data.
6. The apparatus of claim 1 , further comprising a transceiver configured to:
transmit the data for downlink transmission at the selected dwell time of the determined hopping frequency in the set of hopping frequencies when the energy detection of the channel access procedure is less than the selected threshold.