Methods and communications devices for transmission of uplink signals according to priorities
A method of operating a communications device in a wireless communications network is provided. The method comprises determining that the communications device should transmit at least two uplink signals to the wireless communications network, wherein the uplink signals are each to be transmitted in a set of uplink resources of a wireless access interface, determining that the set of uplink radio resources in which a first of the uplink signals should be transmitted at least partially overlaps the set of uplink radio resources in which a second of the uplink signals should be transmitted, wherein the first uplink signal has a different one of a plurality of physical layer priority levels to the second uplink signal, and detecting an indication of whether the first uplink signal and the second uplink signal should be multiplexed.
1. A method of operating a communications device in a wireless communications network, the method comprising:
determining that the communications device should transmit at least two uplink signals to the wireless communications network, wherein the uplink signals are each to be transmitted in a set of uplink resources of a wireless access interface,
determining that the set of uplink radio resources in which a first of the uplink signals should be transmitted at least partially overlaps the set of uplink radio resources in which a second of the uplink signals should be transmitted, wherein the first uplink signal has a different one of a plurality of physical layer priority levels to the second uplink signal, and
detecting an indication of whether the first uplink signal and the second uplink signal should be multiplexed,
wherein, if the indication indicates that the first uplink signal and the second uplink signal should be multiplexed, the method further comprises multiplexing the first uplink signal and the second uplink signal into a third uplink signal, and transmitting the third uplink signal,
wherein, if the indication indicates that the first uplink signal and the second uplink signal should not be multiplexed, the method further comprises transmitting only the one of the first uplink signal and the second uplink signal that has a higher physical layer priority level,
wherein the indication is explicitly indicated by at least one of a plurality of downlink signals received by the communications device from the wireless communications network, and
wherein the indication comprises a first dynamic indicator explicitly indicated by a first of the downlink signals on which the first uplink signal is based and a second dynamic indicator explicitly indicated by a second of the downlink signals on which the second uplink signal is based.
2. The method according to claim 1 , wherein the indication is implicit and is determined by the communications device on the basis of at least one of the first uplink signal and the second uplink signal.
3. The method according to claim 2 , wherein the first uplink signal comprises first uplink control information, and the second uplink signal comprises second uplink control information.
4. The method according to claim 3 , wherein the indication indicates that the first uplink signal and the second uplink signal should be multiplexed if the third uplink signal would comprise a total number of bits equal to or less than a threshold number of bits.
5. The method according to claim 4 , wherein the total number of bits of the third uplink signal is calculated by the communications device by adding a total number of bits of the first uplink control information, a total number of bits of the second uplink control information, and a number of bits of a Cyclic Redundancy Check, CRC, to be included within the third uplink signal.
6. The method according to claim 4 , wherein the threshold number of bits is configured via Radio Resource Control, RRC, signalling from the wireless communications network.
7. The method according to claim 4 , wherein the threshold number of bits is indicated by the one of a plurality of downlink signals received by the communications device from the wireless communications network that schedules one of the first uplink signal and the second uplink signal.
8. The method according to claim 4 , wherein the threshold number of bits is indicated by one of a plurality of downlink signals received by the communications device from the wireless communications network, the one of the downlink signals indicating that the communications device should transmit an aperiodic Channel State Information, CSI, message which indicates one or more communications characteristics of an uplink data message transmitted by the communications device.
9. The method according to claim 4 , wherein the threshold number of bits is dependent on a maximum code rate, the maximum code rate being configured via RRC signalling from the wireless communications network.
10. The method according to claim 3 , wherein the third uplink signal is transmitted within the one of the set of uplink radio resources in which the first uplink signal was to be transmitted and the set of uplink radio resources in which the second uplink signal was to be transmitted which has the largest capacity.
11. The method according to claim 3 , wherein a plurality of maximum code rates are configured via RRC signalling from the wireless communications network, each of the maximum code rates being associated with one of the plurality of physical layer priority levels.
12. The method according to claim 2 , wherein the first uplink signal comprises uplink control information, and the second uplink signal comprises uplink data.
13. The method according to claim 12 , wherein the indication indicates that the first uplink signal and the second uplink signal should be multiplexed if an amount of uplink radio resources of the wireless access interface required to transmit the uplink control information is equal to or less than a threshold percentage amount of the set of uplink radio resources in which the second uplink signal was to be transmitted.
14. The method according to claim 13 , wherein the threshold percentage amount is dependent on a scaling factor, the scaling factor being configured via RRC signalling from the wireless communications network.
15. The method according to claim 14 , wherein the threshold percentage amount is equal to or less than the scaling factor.
16. The method according to claim 13 , wherein the threshold percentage amount is configured via RRC signalling from the wireless communications network.
17. The method according to claim 13 , wherein the threshold percentage amount is indicated by one of a plurality of downlink signals received by the communications device from the wireless communications network that schedules one of the first uplink signal and the second uplink signal.
18. A communications device suitable for use in a wireless communications network, the communications device comprising:
transceiver circuitry configured to transmit signals and receive signals via a wireless access interface, and
controller circuitry configured in combination with the transceiver circuitry:
to determine that the communications device should transmit at least two uplink signals to the wireless communications network, wherein the uplink signals are each to be transmitted in a set of uplink resources of the wireless access interface,
to determine that the set of uplink radio resources in which a first of the uplink signals should be transmitted at least partially overlaps the set of uplink radio resources in which a second of the uplink signals should be transmitted, wherein the first uplink signal has a different one of a plurality of physical layer priority levels to the second uplink signal, and
to detect an indication of whether the first uplink signal and the second uplink signal should be multiplexed,
wherein, if the indication indicates that the first uplink signal and the second uplink signal should be multiplexed, the controller circuitry is configured in combination with the transceiver circuitry to multiplex the first uplink signal and the second uplink signal into a third uplink signal, and to transmit the third uplink signal,
wherein, if the indication indicates that the first uplink signal and the second uplink signal should not be multiplexed, the controller circuitry is configured in combination with the transceiver circuitry to transmit only the one of the first uplink signal and the second uplink signal that has a higher physical layer priority level,
wherein the indication is explicitly indicated by at least one of a plurality of downlink signals received by the communications device from the wireless communications network, and
wherein the indication comprises a first dynamic indicator explicitly indicated by a first of the downlink signals on which the first uplink signal is based and a second dynamic indicator explicitly indicated by a second of the downlink signals on which the second uplink signal is based.
19. An infrastructure equipment forming part of a wireless communications network, the infrastructure equipment comprising:
transceiver circuitry configured to transmit signals and receive signals via a wireless access interface provided by the wireless communications network, and
controller circuitry configured in combination with the transceiver circuitry:
to determine that the infrastructure equipment is going to receive at least two uplink signals from the communications device, wherein the uplink signals are each to be received in a set of uplink resources of the wireless access interface,
to determine that the set of uplink radio resources in which a first of the uplink signals is going to be received at least partially overlaps the set of uplink radio resources in which a second of the uplink signals is going to be received, wherein the first uplink signal has a different one of a plurality of physical layer priority levels to the second uplink signal, and
to transmit, to the communications device, an explicit indication of whether the first uplink signal and the second uplink signal should be multiplexed,
wherein the explicit indication is comprised in one of the downlink signals, and
wherein the indication comprises a first dynamic indicator explicitly indicated by a first of the downlink signals on which the first uplink signal is based and a second dynamic indicator explicitly indicated by a second of the downlink signals on which the second uplink signal is based.
20. The infrastructure equipment according to claim 19 , wherein the controller circuitry is configured in combination with the transceiver circuitry to transmit, to the communications device, a threshold for use by the communications device in conjunction with an implicit indication, detected at the communications device, of whether the first uplink signal and the second uplink signal should be multiplexed, wherein the threshold is transmitted via Radio Resource Control, RRC, signalling.