BACKGROUND

The following relates generally to wireless communications, and more specifically to discontinuous reception wakeup operation with multiple component carriers.

Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform-spread-OFDM (DFT-S-OFDM). A wireless multiple-access communications system may include a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE).

Wireless communication systems may operate in millimeter wave (mmW) frequency ranges, e.g., 28 GHz, 40 GHz, 60 GHz, etc. Wireless communications at these frequencies may be associated with increased signal attenuation (e.g., path loss), which may be influenced by various factors, such as temperature, barometric pressure, diffraction, etc. As a result, signal processing techniques, such as beamforming, may be used to coherently combine energy and overcome the path losses at these frequencies. Due to the increased amount of path loss in mmW communication systems, transmissions from the base station and/or the UE may be beamformed.

A UE may operate in a discontinuous reception (DRX) mode (e.g., a connected DRX (C-DRX) mode) where the UE transitions between an active state (e.g., where the UE wakes up to determine if data is available for the UE) and a sleep state (e.g., where the UE shuts down various hardware/processes to conserve power). The UE may determine if data is available by monitoring a control channel, such as a physical downlink control channel (PDCCH). The PDCCH may carry or otherwise convey an indication that the base station has data ready to transmit to the UE. In some examples of wireless communications systems, a UE may support carrier aggregation, as well as operating in a discontinuous reception mode. In carrier aggregation, a base station and a UE may use multiple carriers to increase throughput. Some techniques for using carrier aggregation in a discontinuous reception mode are deficient.

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support discontinuous reception wakeup operation with multiple component carriers. A user equipment (UE) may support carrier aggregation to realize a greater bandwidth and higher throughput, as well as support a discontinuous reception mode operation to reduce power consumption. To attain benefits of both carrier aggregation and discontinuous reception mode operation, the UE may receive a wakeup signal. The wakeup signal may provide an indication to the UE on whether to remain in a certain state during the discontinuous reception mode operation; thereby providing improved power efficiency for the UE. The wakeup signal may carry additional information such as a carrier aggregation wakeup configuration, which may allow the UE to activate some secondary cells for higher throughput. In this case, the UE may avoid activating secondary cells on which transmission may not occur. Thereby, the UE conserves power consumption, reduces latency, and improves communication efficiency.

A method of wireless communications at a UE is described. The method may include receiving configuration signaling configuring the UE with a set of carrier aggregation wakeup configurations, receiving, while operating in a discontinuous reception mode, a wakeup signal using at least one component carrier, identifying a configuration indicator indicating a first carrier aggregation wakeup configuration of the set of carrier aggregation wakeup configurations based on the wakeup signal, identifying a second component carrier based on the first carrier aggregation wakeup configuration, and monitoring a control channel of the second component carrier based on the first carrier aggregation wakeup configuration.

An apparatus for wireless communications is described. The apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive configuration signaling configuring the apparatus with a set of carrier aggregation wakeup configurations, receive, while operating in a discontinuous reception mode, a wakeup signal using at least one component carrier, identify a configuration indicator indicating a first carrier aggregation wakeup configuration of the set of carrier aggregation wakeup configurations based on the wakeup signal, identify a second component carrier based on the first carrier aggregation wakeup configuration, and monitor a control channel of the second component carrier based on the first carrier aggregation wakeup configuration.

Another apparatus for wireless communications is described. The apparatus may include means for receiving configuration signaling configuring the apparatus with a set of carrier aggregation wakeup configurations, receiving, while operating in a discontinuous reception mode, a wakeup signal using at least one component carrier, identifying a configuration indicator indicating a first carrier aggregation wakeup configuration of the set of carrier aggregation wakeup configurations based on the wakeup signal, identifying a second component carrier based on the first carrier aggregation wakeup configuration, and monitoring a control channel of the second component carrier based on the first carrier aggregation wakeup configuration.

A non-transitory computer-readable medium storing code for wireless communications at a UE is described. The code may include instructions executable by a processor to receive configuration signaling configuring the UE with a set of carrier aggregation wakeup configurations, receive, while operating in a discontinuous reception mode, a wakeup signal using at least one component carrier, identify a configuration indicator indicating a first carrier aggregation wakeup configuration of the set of carrier aggregation wakeup configurations based on the wakeup signal, identify a second component carrier based on the first carrier aggregation wakeup configuration, and monitor a control channel of the second component carrier based on the first carrier aggregation wakeup configuration.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for indexing a table, based on the configuration indicator, for identifying at least one parameter of the first carrier aggregation wakeup configuration, where monitoring the wakeup signal resource further includes and monitoring the control channel of the second component carrier based on the at least one parameter.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the wakeup signal using the at least one component carrier further may include operations, features, means, or instructions for monitoring a defined bandwidth part of the at least one component carrier for the wakeup signal.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates a duration of a monitoring state within a DRX cycle, and where monitoring the control channel of the second component carrier further may include operations, features, means, or instructions for monitoring, for the duration of the monitoring state, the control channel of the second component carrier.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates a monitoring occasion periodicity for the second control channel, and where monitoring the second control channel of the second component carrier further may include operations, features, means, or instructions for monitoring, for the duration of the monitoring state, each monitoring occasion of the second control channel of the second component carrier based on the monitoring occasion periodicity.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates a number of control channel monitoring candidates for the second control channel, where monitoring the second control channel of the second component carrier further may include operations, features, means, or instructions for monitoring, for the duration of the monitoring state, one or more control channel monitoring candidates of the second control channel based on the number of control channel monitoring candidates.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, receiving the wakeup signal using the at least one component carrier further may include operations, features, means, or instructions for monitoring, in accordance with a beam sweeping pattern, a set of beams that each include a beamformed transmission of the wakeup signal.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, identifying the configuration indicator further may include operations, features, means, or instructions for decoding the wakeup signal to obtain the configuration indicator.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, decoding the wakeup signal further may include operations, features, means, or instructions for channel decoding the wakeup signal to obtain the configuration indicator.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the wakeup signal is encoded with a polar code.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, each carrier aggregation wakeup configuration of the set of carrier aggregation wakeup configurations corresponds to a respective decoding hypothesis of a set of different decoding hypotheses, and where identifying the configuration indicator further may include operations, features, means, or instructions for performing blind decoding of the wakeup signal using at least one of the set of different decoding hypotheses to obtain a bit sequence that passes error detection and identifying the configuration indicator from a set of different configuration indicators that corresponds to a first decoding hypothesis of the set of different decoding hypotheses used to decode the bit sequence.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, identifying the configuration indicator further may include operations, features, means, or instructions for determining that a bit sequence decoded from the wakeup signal in accordance with a first resource element mapping pattern of a set of different resource element mapping patterns passes error detection and identifying the configuration indicator from a set of different configuration indicators based on the first resource element mapping pattern.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, a first resource element mapping pattern of the plurality of different resource element mapping patterns indicates a beam sweeping pattern.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, identifying the configuration indicator further may include operations, features, means, or instructions for decoding the wakeup signal to obtain a bit sequence, applying a set of scrambling sequences to the bit sequence to generate a set of scrambled bit sequences, determining a first scrambled bit sequence of the set of scrambled bit sequences passes error detection and identifying the configuration indicator from a set of different configuration indicators based on the first scrambled bit sequence.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, identifying the configuration indicator further may include operations, features, means, or instructions for decoding the wakeup signal to obtain a bit sequence, applying a set of root sequences to the bit sequence to generate a set of root bit sequences, determining a first root bit sequence of the set of root bit sequences passes error detection and identifying the configuration indicator from a set of different configuration indicators based on the first root bit sequence.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, identifying the configuration indicator further may include operations, features, means, or instructions for decoding the wakeup signal to obtain a set of bit sequences based on applying a set of respective phase shifts to the wakeup signal, determining a first bit sequence of the set of bit sequences passes error detection and identifying the configuration indicator from a set of different configuration indicators based on the first bit sequence.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates an identifier of the second component carrier.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates an identifier of the second component carrier and an identifier of at least one additional component carrier.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates an identifier of at least one bandwidth part of the at least one component carrier, an identifier of at least one bandwidth part of the second component carrier, or both.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the UE is operating in a discontinuous reception mode.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, each carrier aggregation wakeup configuration of the plurality of carrier aggregation wakeup configurations indicates at least one component carrier to activate subsequent to receiving the wakeup signal.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, each carrier aggregation wakeup configuration of the plurality of carrier aggregation wakeup configurations indicates at least one bandwidth part on at least one component carrier to activate subsequent to receiving the wakeup signal.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the at least one component carrier includes the second component carrier.

A method of wireless communications at a base station is described. The method may include transmitting configuration signaling configuring a UE with a set of carrier aggregation wakeup configurations, transmitting, using at least one component carrier, a wakeup signal to indicate a first carrier aggregation wakeup configuration of a set of carrier aggregation wakeup configurations, and transmitting control information via a control channel of a second component carrier based on the first carrier aggregation wakeup configuration.

An apparatus for wireless communications is described. The apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit configuration signaling configuring a UE with a set of carrier aggregation wakeup configurations, transmit, using at least one component carrier, a wakeup signal to indicate a first carrier aggregation wakeup configuration of a set of carrier aggregation wakeup configurations, and transmit control information via a control channel of a second component carrier based on the first carrier aggregation wakeup configuration.

Another apparatus for wireless communications is described. The apparatus may include means for transmitting configuration signaling configuring a UE with a set of carrier aggregation wakeup configurations, transmitting, using at least one component carrier, a wakeup signal to indicate a first carrier aggregation wakeup configuration of a set of carrier aggregation wakeup configurations, and transmitting control information via a control channel of a second component carrier based on the first carrier aggregation wakeup configuration.

A non-transitory computer-readable medium storing code for wireless communications is described. The code may include instructions executable by a processor to transmit configuration signaling configuring a UE with a set of carrier aggregation wakeup configurations, transmit, using at least one component carrier, a wakeup signal to indicate a first carrier aggregation wakeup configuration of a set of carrier aggregation wakeup configurations, and transmit control information via a control channel of a second component carrier based on the first carrier aggregation wakeup configuration.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the configuration signaling indicates a configuration of a table that comprises at least one parameter for each carrier aggregation wakeup configuration of the plurality of carrier aggregation wakeup configurations.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting, using the at least one component carrier, the wakeup signal further may include operations, features, means, or instructions for transmitting the wakeup signal within a defined bandwidth part of the at least one component carrier.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates a duration of a monitoring state within a DRX cycle, and where transmitting the control information via the control channel of the second component carrier further may include operations, features, means, or instructions for transmitting the control information via the control channel of the second component carrier based on the duration of the monitoring state.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates a monitoring occasion periodicity for the second control channel, and where transmitting the control information via the second control channel of the second component carrier further may include operations, features, means, or instructions for transmitting the control information via the second control channel of the second component carrier based on each monitoring occasion of the second control channel.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates a number of control channel monitoring candidates for the second control channel, where transmitting the control information via the second control channel of the second component carrier further may include operations, features, means, or instructions for transmitting the control information via the second control channel of the second component carrier within at least one of the control channel monitoring candidates of the second control channel.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting, using the at least one component carrier, the wakeup signal may further include operations, features, means, or instructions for transmitting, in accordance with a beam sweeping pattern, a set of beams that each include a beamformed transmission of the wakeup signal.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for channel encoding a configuration indicator to generate a channel encoded sequence and generating the wakeup signal based on the channel encoded sequence.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, channel encoding the configuration indicator further may include operations, features, means, or instructions for encoding the configuration indicator with a polar code to generate the channel encoded sequence.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting, using the at least one component carrier, the wakeup signal further may include operations, features, means, or instructions for transmitting the wakeup signal in accordance with a first resource element mapping pattern of a set of different resource element mapping patterns.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting, using the at least one component carrier, the wakeup signal further may include operations, features, means, or instructions for scrambling a bit sequence based on a first scrambling sequence of a set of scrambling sequences and generating the wakeup signal based on the scrambled bit sequence.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting, using the at least one component carrier, the wakeup signal further may include operations, features, means, or instructions for applying a first root sequence of a set of root sequences to a bit sequence to generate a root bit sequence and generating the wakeup signal based on the root bit sequence.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, transmitting, using the at least one component carrier, the wakeup signal further may include operations, features, means, or instructions for applying a first phase shift of a set of different phase shifts to the wakeup signal and transmitting the phase shifted wakeup signal.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates an identifier of the second component carrier.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates an identifier of the second component carrier and an identifier of at least one additional component carrier.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the first carrier aggregation wakeup configuration indicates an identifier of at least one bandwidth part of the at least one component carrier, an identifier of at least one bandwidth part of the second component carrier, or both.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the UE is operating in a discontinuous reception mode.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, each carrier aggregation wakeup configuration of the plurality of carrier aggregation wakeup configurations indicates at least one component carrier to activate subsequent to receiving the wakeup signal.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, each carrier aggregation wakeup configuration of the plurality of carrier aggregation wakeup configurations indicates at least one bandwidth part on at least one component carrier to activate subsequent to receiving the wakeup signal.

