Wake up signal for machine type communication and Narrowband-Internet-of-Things devices
Systems and methods of reducing power consumption associated with paging or cDRX mode are described. A wake-up receiver (WUR) wakes up from an idle mode or cDRX state. Whether a wake-up signal (WUS) has been received by the WUR is determined. The WUS is a low-complexity signal that is less complicated than a PDCCH or PDSCH and is repeated multiple times at resource elements as indicated in a configuration from an eNB. If received, a baseband transceiver wakes up for reception of a PDCCH for the UE in a PO when the UE is in the idle mode or a PDSCH for the UE when the UE is in the cDRX state.
1. A method for wake-up signal (WUS) reception by a wireless device, comprising:
determining, while operating in an idle mode, whether a WUS has been received from a base station; and
monitoring, in response to determining that the WUS has been received, one or more of a Machine Type Communication (MTC) Physical Downlink Control Channel (MPDCCH) or a Narrowband Physical Downlink Control Channel (NPDCCH) in a paging occasion (PO), wherein reception of the WUS is based on a timing offset between the WUS and the PO.
2. The method of claim 1 , further comprising:
skipping, in response to determining that the WUS has not been received, monitoring of the PO while operating in the idle mode.
3. The method of claim 1 ,
wherein a WUS frequency resource allocation includes configuration of a subset of Physical Resource Blocks (PRBs) from paging resources.
4. The method of claim 3 ,
wherein the subset of PRBs includes a first PRB from the paging resources.
5. The method of claim 1 ,
wherein determining, while operating in an idle mode, whether the WUS has been received from the base station is performed based on a Radio Resource Control (RRC) configuration provided by System Information Broadcast (SIB) signaling that indicates that WUS is supported in a cell.
6. The method of claim 1 ,
wherein the wireless device comprises a first baseband processor configured to decode the WUS and a second baseband processor configured to decode the MPDCCH or NPDCCH;
wherein the first baseband processor is deactivated during reception of the MPDCCH or NPDCCH; and
wherein the second baseband processor is deactivated during reception of the WUS.
7. The method of claim 6 ,
wherein the first baseband processor and the second baseband processor are disposed in different receiver chains;
wherein each receiver chain has active analog and digital radio frequency (RF) components; and
wherein a receiver chain associated with a first baseband filter is configured to tap a signal from passive filters of a receiver chain associated with a second baseband filter.
8. An apparatus, comprising:
a memory; and
one or more baseband processors in communication with the memory and configured to:
determine, while operating in an idle mode, whether a wake-up signal (WUS) has been received from a base station; and
monitor, in response to determining that the WUS has been received, one or more of a Machine Type Communication (MTC) Physical Downlink Control Channel (MPDCCH) or a Narrowband Physical Downlink Control Channel (NPDCCH) in a paging occasion (PO), wherein reception of the WUS is based on a timing offset between the WUS and the PO.
9. The apparatus of claim 8 ,
wherein the one or more baseband processors are further configured to:
skip, in response to determining that the WUS has not been received, monitoring of the PO while operating in the idle mode.
10. The apparatus of claim 8 ,
wherein a WUS frequency resource allocation includes configuration of a subset of Physical Resource Blocks (PRBs) from paging resources.
11. The apparatus of claim 10 ,
wherein the subset of PRBs includes a first PRB from the paging resources.
12. The apparatus of claim 8 ,
wherein the determination whether the WUS has been received is performed based on a Radio Resource Control (RRC) configuration provided by System Information Broadcast (SIB) signaling that indicates that WUS is supported in a cell.
13. The apparatus of claim 8 ,
wherein the one or more baseband processors comprise a first baseband processor configured to decode the WUS and a second baseband processor configured to decode the MPDCCH or NPDCCH;
wherein the first baseband processor is deactivated during reception of the MPDCCH or NPDCCH; and
wherein the second baseband processor is deactivated during reception of the WUS.
14. The apparatus of claim 13 ,
wherein the first baseband processor and the second baseband processor are disposed in different receiver chains;
wherein each receiver chain has active analog and digital radio frequency (RF) components; and
wherein a receiver chain associated with a first baseband filter is configured to tap a signal from passive filters of a receiver chain associated with a second baseband filter.
15. An apparatus, comprising:
a memory; and
processing circuitry arranged to, upon executing instructions stored in the memory, cause the apparatus to:
transmit, to a user equipment (UE) operating in an idle mode, a wake-up signal (WUS); and
transmit to the UE after transmission of the WUS and during a paging occasion (PO), paging information on one or more of a Machine Type Communication (MTC) Physical Downlink Control Channel (MPDCCH) or Narrowband Physical Downlink Control Channel (NPDCCH), wherein transmission of the WUS is based on a timing offset between the WUS and the PO.
16. The apparatus of claim 15 ,
wherein a WUS frequency resource allocation includes configuration of a subset of Physical Resource Blocks (PRBs) from paging resources.
17. The apparatus of claim 16 ,
wherein the subset of PRBs includes a first PRB from the paging resources.
18. The apparatus of claim 17 ,
wherein a Radio Resource Control (RRC) configuration provided by System Information Broadcast (SIB) signaling that indicates that WUS is supported in a cell.
19. An apparatus, comprising:
a memory; and
one or more baseband processors in communication with the memory and configured to:
receive a wake-up signal (WUS) configuration from a base station that indicates that a WUS is supported by the base station, the WUS included in a first physical downlink control channel (PDCCH);
wake up at a resource indicated by the WUS configuration and determine whether the WUS has been received, wherein reception of the WUS is based on a timing offset between the WUS and a start of a connected mode Discontinuous Reception (cDRX) active time; and
in response to a determination that the WUS has been received, wake up for monitoring a second PDCCH during the cDRX active time.
20. The apparatus of claim 19 ,
wherein the one or more baseband processors are further configured to:
skip, in response to determining that the WUS has not been received, monitoring the second PDCCH.
21. The apparatus of claim 19 ,
wherein at least one of:
the one or more baseband processors are further configured to monitor for the WUS in response to a determination that the apparatus is in an area in which the WUS is supported and otherwise monitor for legacy paging;
the WUS configuration is cell-specific and indicates a maximum number of repetitions of the WUS; or
the WUS is received at a predetermined time offset from a start of a paging occasion when the apparatus is in idle mode.
22. The apparatus of claim 19 ,
wherein the one or more baseband processors comprise a first baseband processor configured to decode the WUS and a second baseband processor configured to decode the second PDCCH;
wherein the first baseband processor is deactivated during reception of the PDCCH; and
wherein the second baseband processor is deactivated during reception of the WUS.
23. The apparatus of claim 22 ,
wherein the first baseband processor and the second baseband processor are disposed in different receiver chains;
wherein each receiver chain has active analog and digital radio frequency (RF) components; and
wherein a receiver chain associated with a first baseband filter is configured to tap a signal from passive filters of a receiver chain associated with a second baseband filter.
24. An apparatus, comprising:
a memory; and
processing circuitry arranged to, upon executing instructions stored in the memory, cause the apparatus to:
transmit, to a user equipment (UE), a wake-up signal (WUS) configuration that indicates support of a WUS, the WUS included in a first physical downlink control channel (PDCCH); and
transmit, to the UE, the WUS, wherein transmission of the WUS is based on a timing offset between the WUS and a start of a connected mode Discontinuous Reception (cDRX) active time.
25. The apparatus of claim 24 ,
wherein the processing circuitry is further arranged to, upon executing instructions stored in the memory, cause the apparatus to:
transmit, to the UE, a second PDCCH during the cDRX active time.