Patent Description:
These improvements may also be applicable to other multiaccess technologies and the telecommunication standards that employ these technologies.

<NPL>) discusses both MAC options and build a common understanding on the issue, in which the view is that a single MAC is more similar to the current MAC architecture, whereas dual MAC may result in easier LIE operation and has less impacts to the specification.

In wireless communications, base stations and a User Equipment (UE) send different notification and paging signals to each other in order to facilitate communication. These signals can help to improve the overall communication as well as the access and control of each device within the wireless system.

Battery life can be an important issue for UEs. A UE may be configured to use a DRX cycle that enables the UE to monitor for downlink control information, e.g., a Physical Downlink Control Channel (PDCCH), discontinuously in order to reduce battery use at the UE. In systems that utilize Carrier Aggregation (CA), the UE can communicate with the network utilizing a primary cell (PCell) and a secondary cell (SCell). PCells and SCells may carry different types of traffic. Data bursts on an SCell may be interleaved with inactivity periods. Such periods of inactivity present an ideal situation for DRX. In addition, active SCells can consume more power that can reduce the battery life of UEs. In some instances, PCells and SCells may be supported by separate transceivers.

Aspects presented herein provide an enhanced power management solution, by configuring a UE with more than one DRX configuration for different cells. As described in detail herein, the network may configure a plurality of DRX groups and provide each of the plurality of DRX groups with a respective DRX configuration.

In an aspect of the disclosure, a method and an apparatus are provided for wireless communication at a base station. The apparatus determines a configuration of a plurality of DRX groups for communicating with a UE. The apparatus then configures the UE with a first DRX configuration of a first DRX group for a first set of serving cells. The apparatus then configures the UE with a second DRX configuration of a second DRX group for a second set of serving cells.

In another aspect of the disclosure, a method and an apparatus are provided for wireless communication at a UE. The apparatus receives a first DRX configuration of a first DRX group for a first set of serving cells. The apparatus then receives a second DRX configuration of a second DRX group for a second set of serving cells. Then, the apparatus enters a DRX mode based on at least one of the first DRX configuration for the first set of serving cells and the second DRX configuration for the second set of serving cells.

The base stations <NUM> configured for <NUM> LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC <NUM> through backhaul links <NUM> (e.g., S1 interface). The base stations <NUM> configured for <NUM> NR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with core network <NUM> through backhaul links <NUM>. In addition to other functions, the base stations <NUM> may perform one or more of the following functions: transfer of user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), intercell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment trace, RAN information management (RIM), paging, positioning, and delivery of warning messages. The base stations <NUM> may communicate directly or indirectly (e.g., through the EPC <NUM> or core network <NUM>) with each other over backhaul links <NUM> (e.g., X2 interface).

The D2D communication link <NUM> may use the DL/UL WWAN spectrum The D2D communication link <NUM> may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH).

The UE <NUM> may also be referred to as a station, a mobile station, a subscriber station a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

Referring again to <FIG>, in certain aspects, a device (e.g., the base station <NUM>) may be configured to comprise a DRX configuration component <NUM> that may be configured to determine a configuration of a plurality of DRX groups for communicating with a UE. For example, in one configuration, the base station <NUM> may determine a configuration of a plurality of DRX groups for communicating with a UE. The base station may configure the UE with a first DRX group for a first set of serving cells. The first set of serving cells may communicate with the UE using a first frequency range. The base station may configure the UE with a second DRX group for a second set of serving cells. The second set of serving cells may communicate with the UE using a second frequency range.

Referring again to <FIG>, in certain aspects, a device (e.g., the UE <NUM>) may be configured to comprise a DRX mode component <NUM> that may be configured to cause the apparatus to enter DRX mode. For example, in one configuration, the UE <NUM> may receive a first DRX group for a first set of serving cells. The UE may receive a second DRX group for a second set of serving cells. The UE may enter a DRX mode based on at least one of the first DRX configuration for the first set of serving cells and the second DRX configuration for the second set of serving cells.

The subcarrier spacing may be equal to <NUM>µ * <NUM> kKz, where µ is the numerology <NUM> to <NUM>.

<FIG> is a diagram <NUM> illustrating a base station <NUM> in communication with a UE <NUM>. Referring to <FIG>, the base station <NUM> may transmit a beamformed signal to the UE <NUM> in one or more of the directions 402a, 402b, 402c, 402d, 402e, 402f, <NUM>, <NUM>. The UE <NUM> may receive the beamformed signal from the base station <NUM> in one or more receive directions 404a, 404b, 404c, 404d. The UE <NUM> may also transmit a beamformed signal to the base station <NUM> in one or more of the directions 404a-404d. The base station <NUM> may receive the beamformed signal from the UE <NUM> in one or more of the receive directions 402a-<NUM>.

A UE may be configured by a base station for DRX. During an RRC connected state, when there is no data transmission in either direction (UL/DL), the UE may go into the DRX mode in which the UE starts monitoring the PDCCH channel discontinuously, using a sleep and wake cycle. Without DRX, the UE needs to monitor PDCCH in every subframe to check whether there is downlink data available for the UE. Continuous monitoring of the PDCCH drains the UE's battery power.

The DRX configuration for a UE may be configured by the network in RRC signaling from a base station, e.g. in an RRC Connection Setup request or an RRC connection reconfiguration request.

A DRX configuration may include the configuration of any of a number of timers and values, e.g., any of an ON duration Timer, a DRX Inactivity Timer, a DRX Retransmission Timer, a DRX UL Retransmission Timer, drx-HARQ-RTT-TimerDL, drx-HARQ-RTT-TimerUL, a long DRX Cycle, a value of the DRX Start Offset, drx-LongCycleStartOffset, a DRX Short Cycle Timer, a short DRX Cycle, drx-SlotOffset, etc. A DRX Cycle may comprise a periodic repetition of ON Duration in which the UE monitors PDCCH and an OFF Duration, which may be referred to as a DRX opportunity. During the OFF duration, the UE does not monitor for PDCCH. The UE may enter a sleep mode or low power mode in which the UE minimizes power consumption by shutting down a radio frequency (RF) function without detecting communication from the base station.

The DRX Inactivity Timer gives a time, e.g., in terms of TTI duration, after the UE successfully decodes PDCCH before the UE may again enter the OFF Duration. The On Duration Timer may give the number of consecutive PDCCH subframe(s) that need to be monitored/decoded when the UE wakes up from the OFF duration in DRX Cycle. The DRX Retransmission Timer may give a consecutive number of PDCCH subframe(s) for the UE to monitor when a retransmission is expected by the UE. A DRX short cycle may correspond to a first DRX cycle that the UE enters after successful expiration of DRX inactivity timer. The UE may be in the short DRX cycle until the expiration of DRX short cycle timer. After that, the UE may enter a Long DRX cycle. A DRX Short Cycle Timer may be a parameter that gives a number of consecutive subframe(s) that the UE shall follow the short DRX cycle after the DRX Inactivity Timer has expired.

Thus, after a successful attempt of DL data, a DRX Inactivity Timer may started for a number of subframes. If there is any UL or DL data transmission during DRX Inactivity Timer the timer restarts again. If DRX Inactivity Timer expires without UL/DL activity, the UE may enter the DRX cycle to achieve power savings. The UE may start with a Short DRX Cycle. If a short cycle timer expires, the UE may enter a longer DRX cycle. The UE may further be able to transition to an idle mode DRX based on an RRC inactivity timer.

<FIG> illustrates a wireless communication system <NUM> in accordance with certain aspects of the present disclosure. The wireless communication system <NUM> may include a base station <NUM> and a UE <NUM>. The base station may correspond to, e.g., base station <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, apparatus <NUM>/<NUM>'. The UE may correspond to, e.g., UE <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, apparatus <NUM>/<NUM>'.

In systems that utilize CA, as shown in <FIG>, the UE <NUM> may communicate with the network via the base station <NUM> utilizing a primary cell (PCell) <NUM> and a secondary cell (SCell) <NUM>. For example, CA allows a UE to transmit and receive data, simultaneously, on multiple component carriers from a single base station. Although the example in <FIG> illustrates a single base station, in another example, the PCell may correspond to a first base station and the SCell may correspond to a second base station. PCells and SCells may carry very different types of traffic. A PCell may always be activated and may be configured to have wide coverage <NUM>. For example, PCell <NUM> may be generally used for scheduling and other control procedures, as well as applications (e.g., voice) that require carriers that provide more on coverage <NUM> than throughput. SCell <NUM> may be activated to help offload bursts of traffic from the PCell <NUM>, as well as be used for applications (e.g., video/data streaming) that prefer to use high bandwidth carriers. Voice and data streaming have very different traffic profiles, in terms of duration of data bursts and idle time between data bursts.

In the example of <FIG>, PCell <NUM> and SCell <NUM> may operate on separate frequency bands, e.g., sub <NUM> carriers and mmW, respectively. As such, the PCell <NUM> and the SCell <NUM> may provide different coverage <NUM>, <NUM>. The coverage <NUM> provided by PCell <NUM> may be greater than the coverage <NUM> provided by SCell <NUM>, which may be due, in part, to the different frequency bands.

In CA, the carriers may be aggregated in the same band or across different bands Carriers aggregated in the same band are known as intra-band, contiguous or intra-band, non-contiguous. In these arrangements, the carriers are within the same band and the aggregated carriers are either adjacent each other (e.g., intra-band, contiguous) or the carriers are not adjacent each other such that there is some frequency spacing separating the carriers (e.g., intra-band, non-contiguous). In inter-band non-contiguous, the carriers belong to different operating frequency bands. For example, a PCell may be on a sub <NUM> carrier (e.g., FR1) and an SCell may be on high-frequency carriers (e.g., mmW, FR2).

Implementing inter-band non-contiguous CA may require the use of separate hardware components (e.g., transceivers). Each transceiver may need a separate power management configuration. As such, a DRX configuration that is utilized for sub <NUM> carriers on a PCell may not be suitable or provide optimal power management for mmW carriers on a SCell. As presented herein, improvements in wireless communication may be achieved through enabling a network to configure multiple DRX profiles, e.g., for different carriers or cells.

In some configurations, the network configures the DRX groups for communicating with at least one UE. In some aspects, the network configures one or more DRX groups. Each of the DRX groups may be configured to have respective DRX configuration parameters (e.g., cycle length, on duration, etc.). The network may have flexibility in determining the configuration of the DRX groups. Each DRX group comprises a set of serving cells. Thus, each serving cell is associated with a DRX group. A PCell is associated with a first DRX group and an SCell may be associated with a second DRX group. In another example, a first cell using FR1 may be assigned to a first DRX group, and a second cell using FR2 may be assigned to a second DRX group. In some instances, the set of serving cells may comprise one or more serving cells. The set of serving cells is configured based on different parameters. In one example, the set of serving cells may share a traffic profiles. In another example, the set of serving cells may be grouped based on frequency bands. The network determines the number of DRX groups to configure and may also determine the number of sets of serving cells. The network may assign an active serving cell to one of the DRX groups. The network may be configured to assign or re-assign serving cells to a particular DRX group via RRC or MAC Control Element (MAC-CE) transmitted to the UE.

The network may be further configured to activate or "wake up" a DRX group that is in an off-state. The network may send a signal in a serving cell on an active DRX group to activate an inactive DRX group that is in the off-state. In some aspects, the network may send a signal to activate an inactive DRX group when none of the DRX groups are active or in an on-state. The ability to activate or "wake up" an inactive or off-state DRX group may be advantageous, especially in aspects where the DRX groups have different DRX sleep cycles. For example, in aspects where a first DRX group has FR1 carriers and a second DRX group has FR2 carriers, the high-frequency carriers may be configured with long DRX sleep cycles. The network may send a signal through a serving cell in the first DRX group having the FR1 carriers, such that the network may activate the second DRX group having the FR2 carriers prior to its next on duration. As such, the network may wake up the second DRX group in order to transmit data without waiting until the next on duration of the second DRX group.

<FIG> illustrates an example <NUM> in which a UE is configured for DRX with two DRX groups, DRX group A <NUM> and DRX group B <NUM>. DRX group A <NUM> comprises an On Duration <NUM> and an Off Duration <NUM>. The combination of the On Duration <NUM> and the Off Duration <NUM> form a first DRX cycle for DRX group A <NUM>. DRX group B <NUM> comprises an On Duration <NUM> and an Off Duration <NUM>. The combination of the On Duration <NUM> and the Off Duration <NUM> form a second DRX cycle for DRX group B. The network may configure the DRX cycles of the DRX groups. In some aspects, a DRX cycle <NUM> of the first DRX configuration may be an integer multiple of a DRX cycle <NUM> of the second DRX configuration. For example, the DRX cycle of DRX group A <NUM> is illustrated as being equivalent to two DRX cycles of DRX group B <NUM>. For On Durations <NUM>, <NUM> the respective DRX groups <NUM>, <NUM> are in an power on-state. During the on duration, the UE may monitor for PDCCH to determine if the UE is scheduled to receive data from the network. During the Off Durations <NUM>, <NUM> the respective DRX groups <NUM>, <NUM> are in a power off-state. During the Off Durations, the UE may enter a reduced power mode in which the UE does not monitor for PDCCH. In some aspects, a first on-state of a first DRX configuration is aligned with a second on-state of a second DRX configuration. For example, in <FIG>, some of the On Durations <NUM>, <NUM> may have aligned start positions, such that the On Durations <NUM>, <NUM> that are aligned partially overlap. The aligned start positions of the On Durations <NUM>, <NUM> may provide a power saving feature. In some aspects, the start positions of On Durations <NUM>, <NUM> may not be aligned and/or may or may not partially overlap.

The network may be configured to transmit a signal in one of a first set of serving cells to the UE. The signal provides an indication for the UE to change a power off-state of serving cells in a particular DRX group to a power on-state. The signal may comprise an index of the DRX group to be activated. The signal may be transmitted to the UE via DCI. For example, the signal may comprise cross-carrier scheduling DCI or an aperiodic CSI request. In another example, the signal may comprise a MAC-CE. For example, in <FIG>, at a time T, a carrier in DRX group B is active because time T coincides with an On Duration <NUM> of DRX group B, while at time T, DRX group A is in an Off Duration <NUM> based on the DRX cycle for DRX group A. The network may be configured to activate the DRX group A, in the event that an application (e.g., video or data stream) is initiated, and without having to wait for the next On Duration of the DRX group A. In some aspects, the network may send the signal <NUM> at time T to the UE on a carrier within DRX group B. At time T, the carriers within DRX group B are active and the network may take advantage of the active carriers in DRX group B to communicate with the UE for DRX Group A. The network send the signal <NUM> to the UE through an active carrier in DRX group B in order to activate the DRX group A at the time T. As such, the UE will enter a power on-state <NUM> at time T, such that the DRX group A transitions to an active state earlier than the next scheduled On Duration. In some aspects, the signal sent by the network to activate the DRX group A may be a cross carrier DCI. In some aspects, the signal sent by the network to activate the DRX group A may be a MAC-CE.

<FIG> illustrates another example <NUM> in which a UE is configured for DRX with different DRX configurations for two DRX groups, DRX group A <NUM> and DRX group B <NUM>. DRX group A <NUM> comprises an On Duration <NUM> and an Off Duration <NUM>. The combination of the On Duration <NUM> and the Off Duration <NUM> form a first DRX cycle for DRX group A <NUM>. DRX group B <NUM> comprises an On Duration <NUM> and an Off Duration <NUM>. The combination of the On Duration <NUM> and the Off Duration <NUM> form a second DRX cycle for DRX group B <NUM>. The DRX group A <NUM> and DRX group B <NUM> may be similar to DRX group A <NUM> and DRX group B <NUM>, respectively, such that the network may configure DRX groups A and B <NUM>, <NUM> in a manner similar to DRX groups A and B <NUM>, <NUM>. However, in the example <NUM> of <FIG>, the network may be configured to transmit a WUS to the UE such that the WUS provides an indication for the serving cells in a desired DRX group to enter a power active state. The network may transmit the WUS before a DRX On Duration of any of the plurality of DRX groups. For example, the network may send the WUS <NUM> to the UE at time T. At time T, DRX group A is in the Off Duration <NUM>, and DRX group B is in the Off Duration <NUM>. Since the DRX groups <NUM>, <NUM> are not active at time T, the network cannot take advantage of an active carrier to activate the desired DRX group using cross carrier DCI or MAC-CE, as discussed above in the example <NUM> of <FIG>. As such, the network may be configured to activate a desired DRX group prior to any of the On Durations of the plurality of DRX groups. In some aspects, a WUS may comprise a sequence sent by the network before a DRX On Duration to indicate that the UE should stay on to receive new data. The WUS may comprise non-sequence based signaling and the disclosure is not intended to be limited to the aspects disclosed herein. When the UE does not receive the WUS, the UE may return to the sleep state without waking up. In some aspects, each of the plurality of DRX groups may be associated with a unique WUS. In such aspect, when the UE receives the unique WUS, the UE may determine which DRX group the UE is supposed to wake up. In some aspects, a single WUS may be configured for the UE. Thus, the WUS may correspond to multiple DRX groups for which the UE is configured. In this example, the WUS may comprise a bitmap that indicates the DRX group to be activated. Upon receipt of the WUS by the UE, the UE changes serving cells into the DRX group associated with the received WUS to enter a power on-state. Each of the plurality of DRX groups may be configured to operate in accordance with their respective DRX configurations until an associated WUS is received.

In the example <NUM> of <FIG>, the WUS <NUM> is sent to the UE, at time T, on DRX group A and provides an indication that the UE is supposed to wake up for DRX group B. As a result of the received WUS <NUM>, the UE wakes up for DRX group B prior to the next On Duration <NUM>, e.g., at a time that coincides with the next scheduled On Duration <NUM> of DRX group A. Thus, DRX group B experiences an earlier On Duration <NUM> due to the WUS. In an example, the next scheduled On Duration <NUM> of DRX group A may be skipped.

<FIG> illustrates an example of communication <NUM> between a base station <NUM> and a UE <NUM>. The base station may determine different DRX configurations for a plurality of DRX groups. The UE <NUM> may be configured with a plurality of DRX groups in order to provide improve power management when the UE communicates across different serving cells. In <FIG>, base station <NUM> may be configured to support CA such that the base station <NUM> may communicate to the UE <NUM> via a PCell and an SCell, in accordance with the system <NUM> of <FIG>. Base station <NUM> may correspond to, e.g., base station <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, apparatus <NUM>/<NUM>'. The UE <NUM> may correspond to, e.g., UE <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, apparatus <NUM>/<NUM>'. The communication between the base station <NUM> and UE <NUM> may comprise mmW communication and/or sub <NUM> communication.

At <NUM>, the base station <NUM> may configure the UE <NUM> with a first DRX configuration of a first DRX group for a first set of serving cells. At <NUM>, the base station <NUM> may configure the UE <NUM> with a second DRX configuration of a second DRX group for a second set of serving cells. The first set of serving cells may comprise a PCell for the UE and the second set of serving cells may comprise a SCell for the UE. Thus, the UE may be configured with the first DRX configuration for the PCell and the second DRX configuration for the SCell. The first set of serving cells, e.g., the PCell, may communicate with the UE using a first frequency range. The second set of serving cells, e.g., the SCell, may communicate with the UE using a second frequency range. In some aspects, the first frequency range may be a sub-<NUM> frequency range. In some aspects, the second frequency range may be a mmW frequency range. The amount of the plurality of DRX groups may be determined by the network. For example, the base station may group serving cells into DRX groups based on a frequency range of the serving cells and/or types of traffic carried by serving cells. The first DRX configuration and/or the second DRX configuration may be sent to the UE using RRC. The UE may be configured with the first DRX configuration and/or the second DRX configuration using MAC-CE.

For example, the base station <NUM> may signal <NUM> the DRX parameters for each of the DRX groups to the UE. The DRX parameters may be signaled in RRC signaling. The RRC signaling may comprise an information element (IE) which includes a list of DRX groups and respective DRX parameters. The UE may then be configured with the first DRX configuration from among the parameters signaled at <NUM> by indicating an index of the first DRX group from the plurality of DRX groups. The index may be comprised in an IE in a serving cell configuration for a first serving cell. The index may be comprised in a MAC-CE sent via PDCCH of the first serving cell. The index may be comprised in a MAC-CE comprising paired parameters. The paired parameters may provide an indication to the UE of a new cell index and a new DRX group of the active serving cell. Similarly, the UE may be configured with the second DRX configuration from among the parameters signaled at <NUM> by indicating an index of the second DRX group in a serving cell configuration for the second serving cell.

Thus, the base station <NUM> may signal <NUM> an indication of the first DRX group and the second DRX group to the UE, e.g., in the configuration for the respective serving cell. Although <NUM> is illustrated as a single signal, the base station may separately indicate the first DRX configuration and the second DRX configuration to the UE. Upon receipt of the signal(s) <NUM>, the UE <NUM> may use the configurations to enter the first DRX mode and/or the second DRX mode. The UE <NUM> continues to operate in accordance with the first and/or second DRX mode until the UE receives instructions otherwise.

At <NUM>, the base station <NUM> may transmit a signal, e.g., via the first serving cell, to the UE to change a power off-state of serving cells in the second DRX group to a power on-state, e.g., as described in connection with <FIG> and <FIG>. The signal may comprise an index of the second DRX group to be activated. The signal may comprise at least one of a cross carrier DCI or MAC-CE. In some aspects, a first on-state of the first DRX configuration may be aligned with a second on-state of the second DRX configuration. In some aspects, a DRX cycle of the first DRX configuration may be an integer multiple of a DRX cycle of the second DRX configuration. The base station <NUM> then transmits <NUM> the signal that may be configured to provide instructions to the UE <NUM> to activate on a desired DRX group.

In the alternative, at <NUM>, the base station <NUM> may transmit a signal (e.g., WUS) to the UE before a DRX on duration of any of the plurality of DRX groups for the serving cells in a desired DRX group to enter a power active state. The signal (e.g., WUS) may provide an indication for the serving cells in the desired DRX group to enter the power active state. In some aspects, each of the plurality of DRX groups may be associated with a unique WUS. In some aspects, a single WUS sequencemay be configured for the UE. The WUS may comprise a bitmap, or other indication, indicating the DRX group to be activated. The UE may change to a power on state for a serving cell in the DRX group associated with the received WUS. The UE may operate in accordance with the respective DRX configuration for each of the plurality of DRX groups until an associated WUS is received. The base station <NUM> transmits <NUM> the signal (e.g., WUS) that may be configured to provide instructions to the UE <NUM> to activate on a desired DRX group.

The UE <NUM>, upon receipt of the transmission <NUM> or <NUM>, wakes up <NUM> for the serving cell corresponding to the desired DRX group in response to the receiving the signal <NUM>, <NUM>. In some aspects, the signal <NUM> may be configured to activate the UE in accordance with the diagram <NUM> of <FIG>. In some aspects, the signal <NUM> may be configured to wake up the UE in accordance with the diagram <NUM> of <FIG>.

<FIG> is a flowchart <NUM> of a method of wireless communication. The method may be performed by a base station (e.g., the base station <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>; the apparatus <NUM>/<NUM>'; the processing system <NUM>, which may include the memory <NUM> and which may be the entire base station <NUM> or a component of the base station <NUM>, such as the TX processor <NUM>, the RX processor <NUM>, and/or the controller/processor <NUM>). One or more of the illustrated operations may be omitted, transposed, or contemporaneous. The base station may implement the method of diagram <NUM>. Optional aspects are illustrated with a dashed line. The method may determine a plurality of DRX groups in order to provide an improved power management when the UE communicates across different serving cells.

At <NUM>, the base station may determine a configuration of a plurality of DRX groups for communicating with a UE. For example, <NUM> may be performed by DRX configuration component <NUM> of apparatus <NUM>. The UE may be configured with a plurality of DRX groups that may be configured to provide optimized power management across the plurality of DRX groups. The amount of the plurality of DRX groups may be based on at least one of a frequency range of serving cells or types of traffic carried by serving cells. The base station may be configured to support CA such that the base station <NUM> may communicate to the UE via a PCell and an SCell, in accordance with the system <NUM> of <FIG>.

At <NUM>, the base station configures the UE with a first DRX configuration of a first DRX group for a first set of serving cells. For example, <NUM> may be performed by first DRX component <NUM> of apparatus <NUM>. <FIG> illustrates an example <NUM> of the base station configuring the UE with a first DRX configuration of a first DRX group for a first set of serving cells. The first set of serving cells may comprise a PCell. PCells may always be activated and may provide wider coverage. Thus, PCells may generally be used for scheduling and other control procedures, as well as applications that require more on coverage than throughput. The first set of serving cells may communicate with the UE using a first frequency range. In some aspects, the first frequency range comprises a sub-<NUM> frequency range. The base station may configures the UE with the first DRX configuration using RRC signaling or by using a MAC-CE.

At <NUM>, the base station configures the UE with a second DRX configuration of a second DRX group for a second set of serving cells. For example, <NUM> may be performed by second DRX component <NUM> of apparatus <NUM>. <FIG> illustrates an example <NUM> of the base station configuring the UE with a second DRX configuration of a second DRX group for a second set of serving cells. The second set of serving cells may comprise an SCell. SCell may be activated to help offload data bursts of traffic from the PCell, in some examples. Active SCells may consume more power and may have a more pressing need to reduce power consumption. The second set of serving cells may communicate with the UE using a second frequency range. In some aspects, the second frequency range comprises a mmW frequency range. The base station configures the UE with the second DRX configuration using RRC signaling or by using MAC-CE.

In some aspects, for example, at <NUM>, the base station signals DRX parameters for each of the plurality of DRX groups to the UE. For example, <NUM> may be performed by DRX parameter component <NUM> of apparatus <NUM>. Although illustrated following <NUM> and <NUM>, the signaling at <NUM> may occur prior to the configurations of <NUM>, <NUM>. <FIG> illustrates an example <NUM> of the base station signaling DRX parameters for each of the plurality of DRX groups to the UE. The DRX parameters may be signaled to the UE, by the base station, in RRC signaling. The RRC signaling comprises an IE including a list of DRX groups and respective DRX parameters. The base station may configure the UE with the first DRX configuration, at <NUM>, by indicating an index of the first DRX group from among the plurality of DRX groups. Similarly, the base station may configure the UE with the second DRX configuration, at <NUM>, by indicating an index of the second DRX group from among the plurality of DRX groups. In some aspects, the index may be comprised in an IE in a serving cell configuration for the first set of serving cells. In some aspects, the index may be comprised in a MAC-CE sent in a PDCCH of the first set of serving cells. In yet some aspects, the index may be comprised in a MAC-CE comprising paired parameters. The paired parameters provide an indication of a new cell index and a new DRX group of the active serving cell to the UE.

In some aspects, for example, at <NUM>, the base station may transmit a signal in one of the first set of serving cells to the UE. For example, <NUM> may be performed by transmission component <NUM> of apparatus <NUM>. <FIG> illustrates an example <NUM> of the base station transmitting a signal in one of the first set of serving cells to the UE. The signal provides an indication for the UE to change a power off-state of serving cells in the second DRX group to a power on-state. Thus, the UE may transition to an on state for the second serving cell in the second set of serving cells, prior to a normal on duration for the second DRX configuration. The signal may comprise an index of the second DRX group to be activated. The signal may comprise at least one of a cross carrier DCI or MAC-CE. In some aspects, a first on-state (e.g., On Duration) of the first DRX configuration may be aligned with a second on-state (e.g., On Duration) of the second DRX configuration. In some aspects, a DRX cycle of the first DRX configuration may be an integer multiple of a DRX cycle of the second DRX configuration. Step <NUM> may or may not occur.

In some aspects, for example, at <NUM>, the base station transmits a signal (e.g., WUS) to the UE. For example, <NUM> may be performed by transmission component <NUM> of apparatus <NUM>. <FIG> illustrates an example <NUM> of the base station transmitting a WUS to the UE. The base station sends the WUS before a DRX on duration of any of the plurality of DRX groups. The WUS provides an indication for the serving cells in a desired DRX group to enter a power active state. In some aspects, each of the plurality of DRX groups may be associated with a unique WUS. In some aspects, a single WUS may be configured for the UE, such that the WUS comprises a bitmap indicating which DRX group is to be activated. The UE changes serving cells into the DRX group associated with the received WUS to enter a power on-state. Each of the plurality of DRX groups operate in accordance with their respective DRX configurations until an associated WUS is received indicating otherwise. Step <NUM> may or may not occur.

<FIG> is a conceptual data flow diagram <NUM> illustrating the data flow between different means/components in an example apparatus <NUM>. The apparatus may be a base station or a component of a base station (e.g., base station <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, apparatus <NUM>/<NUM>') in wireless communication with a UE <NUM> (e.g., UE <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, apparatus <NUM>/<NUM>').

The apparatus includes a reception component <NUM> that receives uplink communication from UE <NUM>. The apparatus includes DRX configuration component <NUM> that determines a configuration of a plurality of DRX groups for communicating with the UE, e.g., as described in connection with <NUM> of <FIG>. The apparatus includes a first DRX component <NUM> that configures the UE with a first DRX group for a first set of serving cells, e.g., as described in connection with <NUM>. The apparatus includes a second DRX component <NUM> that configures the UE with a second DRX configuration of a second DRX group for a second set of serving cells, e.g., as described in connection with <NUM> of <FIG>. The apparatus may include a DRX parameter component <NUM> that signals DRX parameters for each of the plurality of DRX groups to the UE, e.g., as described in connection with <NUM> of <FIG>. The apparatus may include a transmission component <NUM> that transmits a signal in one of the first set of serving cells to the UE to provide an indication for the UE to change a power off-state of serving cells in the second DRX group to a power on-state, e.g., as described in connection with <NUM> of <FIG>. The apparatus may include a wake up component <NUM> that provides an indication for the serving cells in a desired DRX group to enter a power active state, e.g., as described in connection with <NUM> of <FIG>.

<FIG> is a diagram <NUM> illustrating an example of a hardware implementation for an apparatus <NUM>' employing a processing system <NUM>. The processing system <NUM> may be implemented with a bus architecture, represented generally by the bus <NUM>. The bus <NUM> may include any number of interconnecting buses and bridges depending on the specific application of the processing system <NUM> and the overall design constraints. The bus <NUM> links together various circuits including one or more processors and/or hardware components, represented by the processor <NUM>, the components <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and the computer-readable medium / memory <NUM>. The bus <NUM> may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.

The processing system <NUM> may be coupled to a transceiver <NUM>. The transceiver <NUM> is coupled to one or more antennas <NUM>. The transceiver <NUM> provides a means for communicating with various other apparatus over a transmission medium. The transceiver <NUM> receives a signal from the one or more antennas <NUM>, extracts information from the received signal, and provides the extracted information to the processing system <NUM>, specifically the reception component <NUM>. In addition, the transceiver <NUM> receives information from the processing system <NUM>, specifically the transmission component <NUM>, and based on the received information, generates a signal to be applied to the one or more antennas <NUM>. The processing system <NUM> includes a processor <NUM> coupled to a computer-readable medium / memory <NUM>. The processor <NUM> is responsible for general processing, including the execution of software stored on the computer-readable medium / memory <NUM>. The software, when executed by the processor <NUM>, causes the processing system <NUM> to perform the various functions described supra for any particular apparatus. The computer-readable medium / memory <NUM> may also be used for storing data that is manipulated by the processor <NUM> when executing software. The processing system <NUM> further includes at least one of the components <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>. The components may be software components running in the processor <NUM>, resident/stored in the computer readable medium / memory <NUM>, one or more hardware components coupled to the processor <NUM>, or some combination thereof. The processing system <NUM> may be a component of the base station <NUM> and may include the memory <NUM> and/or at least one of the TX processor <NUM>, the RX processor <NUM>, and the controller/processor <NUM>. Alternatively, the processing system <NUM> may be the entire base station (e.g., see <NUM> of <FIG>).

In one configuration, the apparatus <NUM>/<NUM>' for wireless communication includes means for determining a configuration of a plurality of discontinuous reception (DRX) groups for communicating with a user equipment (UE). The apparatus includes means for configuring the UE with a first DRX group for a first set of serving cells. The first set of serving cells communicate with the UE using a first frequency range. The apparatus includes means for configuring the UE with a second DRX group for a second set of serving cells. The second set of serving cells communicate with the UE using a second frequency range. The apparatus may further include means for signaling DRX parameters for each of the plurality of DRX groups to the UE. The apparatus may further include means for transmitting a signal in one of the first set of serving cells to the UE. The signal provides an indication for the UE to change a power off-state of serving cells in the second DRX group to a power on-state. The apparatus may further include means for transmitting a wakeup signal (WUS) to the UE. The WUS is sent before a DRX on duration of any of the plurality of DRX groups such that the WUS provides an indication for the serving cells in a desired DRX group to enter a power active state.

<FIG> is a flowchart <NUM> of a method of wireless communication. The method may be performed by a UE (e.g., the UE <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>; the apparatus <NUM>/<NUM>'; the processing system <NUM>, which may include the memory <NUM> and which may be the entire UE <NUM> or a component of the UE <NUM>, such as the TX processor <NUM>, the RX processor <NUM>, and/or the controller/processor <NUM>). One or more of the illustrated operations may be omitted, transposed, or contemporaneous. The UE may implement the method of diagram <NUM>. Optional aspects are illustrated with a dashed line. The method may help the UE to have an enhanced power management by optimizing the UE's operation of DRX.

At <NUM>, the UE receives a first DRX group for a first set of serving cells. For example, <NUM> may be performed by first DRX component <NUM> of apparatus <NUM>. The first set of serving cells may comprise a PCell configured for the UE. The UE may be configured to communicate with the first cell (e.g., the PCell) from the first set of serving cells using a first frequency range. In some examples, the first frequency range comprises a sub-<NUM> frequency range. The UE may be configured with the first DRX configuration on RRC signaling or by MAC-CE. The RRC signaling may comprise an IE including a list of DRX groups and respective DRX parameters. The UE may be configured to receive an index associated with the first DRX group from the plurality of DRX groups. In some examples, the index may be received by the UE in a MAC-CE sent via PDCCH of the first serving cell. The UE may be configured to support CA such that the UE <NUM> may communicate with the base station via a PCell and an SCell, in accordance with the system <NUM> of <FIG>.

At <NUM>, the UE receives a second DRX group for a second set of serving cells. For example, <NUM> may be performed by second DRX component <NUM> of apparatus <NUM>. The second set of serving cell may include an SCell configured for the UE. The UE may be configured to communicate with the second cell (e.g., SCell) from the second set of serving using a second frequency range. In some examples, the second frequency range comprises a mmW frequency range. The UE may be configured with the second DRX configuration on RRC signaling or by MAC-CE. The RRC signaling may comprise an IE including a list of DRX groups and respective DRX parameters. <FIG> illustrates an example <NUM> of the UE receiving a signal from the base station. The signal provides an indication of the first DRX group and the second DRX group to the UE. Upon receipt of the signal <NUM>, the UE <NUM> may use the configurations to enter the first DRX mode and/or the second DRX mode.

At <NUM>, the UE may be configured to enter a DRX mode. For example, <NUM> may be performed by DRX mode component <NUM> of apparatus <NUM>. Entering the DRX mode may be based on the first DRX configuration for the first set of serving cells and/or the second DRX configuration for the second set of serving cells. <FIG> illustrates an example <NUM> of the UE entering the first DRX mode and the second DRX mode.

In some aspects, for example, at <NUM>, the UE may be configured to receive a signal of DRX parameters for each of the plurality of DRX groups from a base station. For example, <NUM> may be performed by reception component <NUM> of apparatus <NUM>. The DRX parameters may be signaled in RRC signaling and may comprise an IE including a list of DRX groups and respective DRX parameters. Although illustrated following <NUM>, the UE may receive the signaling at <NUM> prior to the receipt of the configurations of <NUM>, <NUM>.

In some aspects, for example, at <NUM>, the UE may be configured to receive a WUS. For example, <NUM> may be performed by wake up component <NUM> of apparatus <NUM>. The WUS, in some aspects, may be from the first serving cell, for the second DRX group. In some examples, the UE may receive the WUS before a DRX on duration of any of a plurality of DRX groups. The WUS may provide an indication for the serving cells in a desired DRX group to enter a power active state. In some examples, each of the plurality of DRX groups may be associated with a unique WUS. In some examples, a single WUS sequencemay be configured for the UE. In such examples, the WUS may comprise a bitmap to indicate which DRX group is to be activated. However, the WUS may be configured in other manners and the disclosure is not intended to be limited to a sequence based WUS.

<FIG> is a conceptual data flow diagram <NUM> illustrating the data flow between different means/components in an example apparatus <NUM>. The apparatus may be a UE or a component of a UE (e.g., UE <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, apparatus <NUM>/<NUM>') communicating with a base station (e.g., the base station <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, apparatus <NUM>/<NUM>').

The apparatus includes a reception component <NUM> that may be configured to receive a signal of DRX parameters for each of the plurality of DRX groups from a base station, e.g., as described in connection with <NUM> of <FIG>. The apparatus includes a first DRX component <NUM> that may be configured to receive the first DRX group for a first set of serving cells, e.g., as described in connection with <NUM> of <FIG>. The apparatus includes a second DRX component <NUM> that may be configured to receive the second DRX configuration of the second DRX group for a second set of serving cells, e.g., as described in connection with <NUM> of <FIG>. The apparatus includes a DRX mode component <NUM> that is configured to cause the apparatus to enter DRX mode, e.g., as described in connection with <NUM> of <FIG>. The apparatus includes a wake up component <NUM> that is configured to receive a signal, e.g., as described in connection with <NUM> of <FIG>. The apparatus includes a transmission component <NUM> that may be configured to transmit uplink communications to base station <NUM>.

<FIG> is a diagram <NUM> illustrating an example of a hardware implementation for an apparatus <NUM>' employing a processing system <NUM>. The processing system <NUM> may be implemented with a bus architecture, represented generally by the bus <NUM>. The bus <NUM> may include any number of interconnecting buses and bridges depending on the specific application of the processing system <NUM> and the overall design constraints. The bus <NUM> links together various circuits including one or more processors and/or hardware components, represented by the processor <NUM>, the components <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> and the computer-readable medium / memory <NUM>. The bus <NUM> may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.

The processing system <NUM> may be coupled to a transceiver <NUM>. The transceiver <NUM> is coupled to one or more antennas <NUM>. The transceiver <NUM> provides a means for communicating with various other apparatus over a transmission medium. The transceiver <NUM> receives a signal from the one or more antennas <NUM>, extracts information from the received signal, and provides the extracted information to the processing system <NUM>, specifically the reception component <NUM>. In addition, the transceiver <NUM> receives information from the processing system <NUM>, specifically the transmission component <NUM>, and based on the received information, generates a signal to be applied to the one or more antennas <NUM>. The processing system <NUM> includes a processor <NUM> coupled to a computer-readable medium / memory <NUM>. The processor <NUM> is responsible for general processing, including the execution of software stored on the computer-readable medium / memory <NUM>. The software, when executed by the processor <NUM>, causes the processing system <NUM> to perform the various functions described supra for any particular apparatus. The computer-readable medium / memory <NUM> may also be used for storing data that is manipulated by the processor <NUM> when executing software. The processing system <NUM> further includes at least one of the components <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>. The components may be software components running in the processor <NUM>, resident/stored in the computer readable medium / memory <NUM>, one or more hardware components coupled to the processor <NUM>, or some combination thereof. The processing system <NUM> may be a component of the UE <NUM> and may include the memory <NUM> and/or at least one of the TX processor <NUM>, the RX processor <NUM>, and the controller/processor <NUM>. Alternatively, the processing system <NUM> may be the entire UE (e.g., see <NUM> of <FIG>).

In one configuration, the apparatus <NUM>/<NUM>' for wireless communication includes means for receiving a first DRX group for a first set of serving cells. The apparatus includes means for receiving a second DRX group for a second set of serving cells. The apparatus includes means for entering a DRX mode based on at least one of the first DRX configuration for the first set of serving cells and the second DRX configuration for the second set of serving cells. The apparatus further includes means for receiving a signal from one of the first set of serving cells. The signal provides an indication for the UE to change a power off-state of serving cells in the second DRX group to a power on-state. The apparatus further includes means for receiving a WUS for the second DRX group using the first set of serving cells.

Claim 1:
A method (<NUM>) of wireless communication at a base station, comprising:
determining (<NUM>) a configuration of a plurality of discontinuous reception, DRX, groups for communicating with a user equipment, UE;
configuring (<NUM>) the UE with a configuration of a first DRX group for a first set of serving cells, the configuration of the first DRX group includes respective DRX parameters; and
configuring (<NUM>) the UE with a configuration of a second DRX group for a second set of serving cells, the configuration of the second DRX group includes respective DRX parameters, wherein a start position of a first on-state of the first DRX group indicated as a DRX parameter in the configuration of the first DRX group and a start position of a second on-state of the second DRX group indicated as a DRX parameter in the configuration of the second DRX group are configured to be aligned.