DMTC window reservation signal in NR shared spectrum
A discovery measurement timing configuration (DMTC) window reservation signal is disclosed for new radio (NR) shared spectrum (NR-SS) networks. The DMTC window is defined providing a reserved location for transmission of essential control signaling and potentially high priority traffic that may be transmitted in a prioritized manner. Access within the DMTC window may be provided with a clear channel assessment (CCA) exempt transmission (CET) option or a non-CET option. When the CET option is used, the reservation duration and period may be conveyed through the channel reservation signal. User equipments (UEs) that detect the reservation signal may re-transmit with added offset to inform neighboring base station that may not be within range of the serving base station. Base station that receive either the transmitted or re-transmitted reservation signal will refrain from communications that may interfere with the reception at the UEs.
1. A method of wireless communication, comprising:
receiving, by a user equipment (UE), a semi-persistent reservation signal from a serving base station during a discovery measurement timing configuration (DMTC) window, wherein the semi-persistent reservation signal identifies reservation of a shared communication channel;
re-transmitting, by the UE, the received semi-persistent reservation signal to one or more base stations other than the serving base station in response to the receiving, wherein the re-transmitting the received semi-persistent reservation signal includes adding an offset period to the re-transmitted received semi-persistent reservation signal, wherein the offset period indicates a difference between a timing of the semi-persistent reservation signal as transmitted by the base station and a timing of the re-transmitted semi-persistent reservation signal as re-transmitted by the UE, and wherein the UE is one of a subset of UEs served by the serving base station identified to re-transmit the received semi-persistent reservation signal; and
engaging in communication with the serving base station by the UE within a clear channel assessment (CCA)-exempt transmission (CET) period of the shared communication channel identified by the re-transmitted received semi-persistent reservation signal after the DMTC window.
2. The method of claim 1 , wherein the received semi-persistent reservation signal identifies a reservation duration and period of the CET period.
3. The method of claim 2 , wherein the reservation duration and period of the CET period are identified by a signature waveform of the received semi-persistent reservation signal.
4. The method of claim 1 , wherein the re-transmitting is performed by the UE at variable times identified by the serving base station.
5. An apparatus configured for wireless communication, the apparatus comprising:
at least one processor; and
a memory coupled to the at least one processor,
wherein the at least one processor is configured:
to receive, by a user equipment (UE), a semi-persistent reservation signal from a serving base station during a discovery measurement timing configuration (DMTC) window, wherein the semi-persistent reservation signal identifies reservation of a shared communication channel;
to re-transmit, by the UE, the received semi-persistent reservation signal to one or more base stations other than the serving base station in response to execution of the configuration of the at least one processor to receive, wherein the configuration of the at least one processor to re-transmit the received semi-persistent reservation signal includes configuration to add an offset period to the re-transmitted received semi-persistent reservation signal, wherein the offset period indicates a difference between a timing of the semi-persistent reservation signal as transmitted by the base station and a timing of the re-transmitted semi-persistent reservation signal as re-transmitted by the UE, and wherein the UE is one of a subset of UEs served by the serving base station identified to re-transmit the received semi-persistent reservation signal; and
to engage in communication with the serving base station by the UE within a clear channel assessment (CCA)-exempt transmission (CET) period of the shared communication channel identified by the re-transmitted received semi-persistent reservation signal after the DMTC window.
6. The apparatus of claim 5 , wherein the received semi-persistent reservation signal identifies a reservation duration and period of the CET period.
7. The apparatus of claim 6 , wherein the reservation duration and period of the CET period are identified by a signature waveform of the received semi-persistent reservation signal.
8. The apparatus of claim 5 , wherein the configuration of the at least one processor to re-transmit is performed by the UE at variable times identified by the serving base station.