Control indicator for power saving in a mobile wireless communication device
A wireless communication device (UE) may receive control indicator information (CII) indicating whether one or more candidate physical control channels (PCCs) are available to the UE for decoding. The UE may perform respective blind decoding if the CII indicates that the one or more candidate PCCs are available, to decode a respective PCC intended for the UE. The UE may receive the CII in the same slot in which PCCs are transmitted, or it may receive the CII in another slot, which may be a narrowband slot. The UE may receive the PCCs in the same slot in which corresponding physical data channels (PDCs) are transmitted, or it may receive the PCCs in another slot, e.g. a slot immediately preceding the slot in which the corresponding PDCs are transmitted. By eliminating unnecessary blind decoding and receiving the CII over narrowband, power consumption of the UE may be greatly reduced.
1. An apparatus comprising:
a processor configured to cause a wireless station to:
conduct wireless communications with a device;
when the wireless station intends to transmit a first physical control channel to the device:
transmit, in a first slot as part of the wireless communications, first control indicator information indicating to the device that the device is to perform blind decoding of one or more candidate physical control channels available to the device for decoding in a second slot, wherein the second slot is a specified number of slots following the first slot; and
transmit the first physical control channel in the second slot; and
when the wireless station does not intend to transmit a physical control channel to the device:
transmit, in the first slot, second control indicator information indicating to the device that the device is not to perform blind decoding in the second slot.
2. The apparatus of claim 1 , wherein the one or more candidate physical control channels are transmitted in the second slot and not in the first slot.
3. The apparatus of claim 1 , wherein the processor is configured to cause the wireless station to transmit a respective physical data channel corresponding to the first physical control channel for the device.
4. The apparatus of claim 3 , wherein the processor is configured to cause the wireless station to transmit the respective physical data channel in one of:
a third slot different from a fourth slot in which corresponding physical data channels are transmitted; or
the third slot.
5. The apparatus of claim 1 , wherein the device is part of a specified group of devices, wherein the transmitted control indicator information is for all devices in the specified group.
6. The apparatus of claim 1 , wherein the processor is configured to cause the wireless station to transmit the control indicator information carried in one of:
a first channel that also includes other information; or
a second channel dedicated to carrying the control indicator information.
7. The apparatus of claim 6 , wherein the processor is configured to cause the wireless station to transmit the second channel over narrowband.
8. A wireless station comprising:
radio circuitry configured to facilitate wireless communications of the wireless station; and
a processor communicatively coupled to the radio circuitry and configured to cause the wireless station to:
when the wireless station intends to transmit a first physical control channel to a device:
transmit, in a first slot as part of the wireless communications, first control indicator information indicating to the device that the device is to perform blind decoding of one or more candidate physical control channels available to the device for decoding in a second slot, wherein the second slot is a specified number of slots following the first slot; and
transmit the first physical control channel in the second slot; and
when the wireless station does not intend to transmit a physical control channel for the device:
transmit, in the first slot, second control indicator information indicating to the device that the device is not to perform blind decoding in the second slot.
9. The wireless station of claim 8 , wherein the one or more physical control channels are transmitted in the second slot and not in the first slot.
10. The wireless station of claim 8 , wherein the processor is configured to cause the wireless station to transmit a respective physical data channel corresponding to the first physical control channel for the device.
11. The wireless station of claim 10 , wherein the processor is configured to cause the wireless station to transmit the respective physical data channel in one of:
a third slot different from a fourth slot in which corresponding physical data channels are transmitted; or
the third slot.
12. The wireless station of claim 8 , wherein the device is part of a specified group of devices, wherein the transmitted control indicator information is for all devices in the specified group.
13. The wireless station of claim 8 , wherein the processor is configured to cause the wireless station to transmit the control indicator information carried in one of:
a first channel that also includes other information; or
a second channel dedicated to carrying the control indicator information.
14. The wireless station of claim 13 , wherein the processor is configured to cause the wireless station to transmit the second channel over narrowband.
15. A non-transitory memory element storing instructions executable by a processor to cause a wireless station to:
conduct wireless communications with a device;
when the wireless station intends to transmit a first physical control channel to the device:
transmit, in a first slot as part of the wireless communications, first control indicator information indicating to the device that the device is to perform blind decoding of one or more candidate physical control channels available to the device for decoding in a second slot, wherein the second slot is a specified number of slots following the first slot; and
transmit the first physical control channel in the second slot; and
when the wireless station does not intend to transmit a physical control channel for the device:
transmit, in the first slot, second control indicator information indicating to the device that the device is not to perform blind decoding in the second slot.
16. The non-transitory memory element of claim 15 , wherein the one or more physical control channels are transmitted in the second slot and not in the first slot.
17. The non-transitory memory element of claim 15 , wherein the instructions are executable by the processor to cause the wireless station to transmit a respective physical data channel corresponding to the first physical control channel for the device.
18. The non-transitory memory element of claim 17 , wherein the instructions are executable by the processor to cause the wireless station to transmit the respective physical data channel in one of:
a third slot different from a fourth slot in which corresponding physical data channels are transmitted; or
the fourth slot.
19. The non-transitory memory element of claim 15 , wherein the device is part of a specified group of devices, wherein the transmitted control indicator information is for all devices in the specified group.
20. The non-transitory memory element of claim 15 , wherein the instructions are executable by the processor to cause the wireless station to transmit the control indicator information carried in one of:
a channel that also includes other information; or
a narrowband channel dedicated to carrying the control indicator information.