Communications devices, infrastructure equipment and methods
A communications device comprises transmitter circuitry and controller circuitry configured to configure the transmitter circuitry to transmit signals representing data to one or more receiving communications devices via a sidelink interface forming part of a wireless access interface for device to device communications comprising a plurality of resource pool instances. The wireless access interface may be provided by a wireless communications network, the transmitter circuitry being configured to transmit signals to the wireless communications network when in a coverage area of a wireless communications network.
1 . A communications device comprising
transmitter circuitry, and
controller circuitry configured to configure the transmitter circuitry
to transmit signals representing data to one or more receiving communications devices via a sidelink interface forming part of a wireless access interface for device to device communications comprising a plurality of resource pool instances, the controller circuitry in combination with the transmitter circuitry being configured
to transmit or to initiate transmission of a sidelink wake-up signal (SWUS) to the one or more receiving communications devices indicating that the one or more receiving communications devices should prepare to receive the signals representing the data in one of the resource pools, and
to transmit the signals representing the data in shared channel resources of the one resource pool indicated, wherein the plurality of the resource pools each comprise a plurality of time slots and a plurality of sub-channels, and the SWUS is transmitted in one or more of the sub-channels in a first of the time slots of the one resource pool.
2 . A communications device according to claim 1 , comprising receiver circuitry, wherein the receiver circuitry is configured to receive signals transmitted via a wireless access interface of a wireless communications network, and the transmitter circuitry is configured to transmit signals via the wireless access interface of the wireless communications network, and the SWUS is transmitted by the wireless communications network.
3 . A communications device according to claim 2 , wherein the controller circuitry is configured to control the transmitter circuitry to initiate transmission of the SWUS by controlling the transmitter circuitry to transmit a request to the wireless communications network to transmit the SWUS.
4 . A communications device according to claim 3 , wherein the controller circuitry is configured to control the receiver circuitry to monitor for the transmission of the SWUS by the wireless communications network, and to control the transmitter circuitry to transmit the signals representing the data in the shared channel resources of the one resource pool if the SWUS is transmitted by the wireless communications network indicates that the one or more receiving communications devices should prepare to receive the signals representing the data in the one resource pool.
5 . A communications device according to claim 1 , wherein the indication of the resources of the shared channel of the one resource pool of the sidelink via which shared channel the signals representing the data will be transmitted is transmitted via a control channel of the one resource pool, the indication of the shared resources being transmitted by the wireless communications network.
6 . A communications device according to claim 1 , wherein the controller circuitry is configured to control the transmitter circuitry to transmit the indication of the resources of the shared channel of the one resource pool of the sidelink via which shared channel the signals representing the data will be transmitted in a control channel of the one resource pool of the sidelink.
7 . A communications device according to claim 1 , wherein the SWUS is transmitted in one or more of the sub-channels in each of the time slots of the one resource pool.
8 . A communications device according to claim 6 , wherein the SWUS indicates that the one or more receiving communications devices should receive the data from one or more of a plurality of time slots of the resource pool, the indication of the shared channel resources being transmitted on a control channel on the one or more of the plurality of time slots of the one resource pool.
9 . A communications device according to claim 1 , wherein the SWUS transmitted in one of the time slots indicates that the one or more receiving communications devices should monitor for signals transmitted on a subsequent time slot of the resource pool to receive the indication of the shared channel resources on the subsequent time slot of the one resource pool.
10 . A communications device according to claim 1 , wherein the one or more receiving communications device are configured to monitor for the SWUS transmitted in a first of the time slots of the one resource pool, the SWUS being configured to indicate that the communications device should monitor for one or both of signals transmitted in the first time slot or monitor for signals transmitted in a subsequent time slot of the resource pool to receive the indication of the shared channel resources.
11 . A communications device according to claim 1 , wherein the one resource pool, on which the indication of the resources of the shared channel on which the signals representing the data will be transmitted, is after a resource pool in which the SWUS is transmitted, the SWUS indicating that the one or more receiving communications device should receive the indication of the shared channel resources on the control channel of the one resource pool which occurs after the resource pool on which the SWUS is transmitted.
12 . A communications device according to claim 2 , wherein the controller circuitry is configured with the receiver circuitry to detect the SWUS transmitted by the wireless communications network and to control the transmitter circuitry to transmit the indication of the resources of the shared channel of the one resource pool on which the signals representing the data will be transmitted in the control channel of the one resource pool, and then to transmit the signals representing the data in the indicated resources.
13 . A communications device according to claim 6 , wherein the controller circuitry is configured with the transmitter circuitry to transmit the SWUS with an indication identifying the communications device which transmits the SWUS.
14 . A communications device according to claim 6 , wherein the controller circuitry is configured with the transmitter circuitry to transmit the SWUS with an indication that the SWUS commonly identifies a plurality of communications devices, the SWUS identifying that one of the plurality of the communications devices transmitted the SWUS.
15 . A communications device according to claim 1 , wherein the SWUS comprises a Physical Random Access Channel, or a Demodulation Reference Signal.
16 . A communications device according to claim 1 , wherein at least part of the physical resources of one or more of the sub-channels and one or more of the time slots are designated as one or more SWUS occasions, at least one of the SWUS occasions being dedicated to one or more communications devices for transmitting an SWUS, the communications device being identified by the SWUS occasion in which the SWUS is transmitted.
17 . A communications device according to claim 1 , at least part of the physical resources of one or more of the sub-channels and one or more of the time slots are designated as one or more SWUS occasions and the SWUS transmitted by the wireless communications network in one of the one or more SWUS occasions is configured to identify the communications devices which will transmit the signals representing the data in the one resource pool.
18 . A method of transmitting data by a communications device, the method comprising:
transmitting signals representing data to one or more receiving communications devices via a sidelink interface forming part of a wireless access interface for device to device communications comprising a plurality of resource pool instances, the transmitting the signals representing the data comprising
transmitting or initiating transmission of a sidelink wake-up signal (SWUS) to the one or more receiving communications devices indicating that the one or more receiving communications devices should prepare to receive the signals representing the data in one of the resource pools, and
transmitting the signals representing the data in shared channel resources of the one resource pool indicated, wherein the plurality of the resource pools each comprise a plurality of time slots and a plurality of sub-channels, and the SWUS is transmitted in one or more of the sub-channels in a first of the time slots of the one resource pool.
19 . An infrastructure equipment forming part of a wireless communications network, the infrastructure equipment comprising:
receiver circuitry configured to receive signals transmitted by one or more communications devices via a wireless access interface provided by the wireless communications network,
transmitter circuitry configured to transmit signals to one or more communications devices via the wireless access interface, and
controller circuitry configured to control the receiver circuitry
to receive an indication to initiate transmission of a sidelink wake-up signal (SWUS) to the one or more receiving communications devices indicating that the one or more receiving communications devices should prepare to receive the signals representing the data in one of a plurality of resource pools, and
to transmit the SWUS to the one or more receiving communications devices, wherein the plurality of the resource pools each comprise a plurality of time slots and a plurality of sub-channels, and the SWUS is transmitted in one or more of the sub-channels in a first of the time slots of the one resource pool.