Method for monitoring physical downlink control channel of power-saving signaling and related equipment

Abstract

A method for a user equipment (UE) to monitor a physical downlink control channel (PDCCH) for power saving signaling is provided. The method includes receiving a discontinuous reception (DRX) configuration from a base station (BS) to configure the UE to monitor a scheduling signal on the PDCCH for a DRX active time, and receiving a configuration from the BS to configure the UE to monitor the scheduling signal on the PDCCH. The power-saving signaling on the PDCCH instructs the UE to wake up the monitoring scheduling signal at the DRX activation time, and the configuration comprises millisecond time before the DRX opening duration starts and instructs the UE to start monitoring the PDCCH to obtain the power-saving signaling.

Description

[0001] This application is a divisional application of the invention patent with application number 202080056608.X, application date August 4, 2020, and invention name “Method and related equipment for monitoring physical downlink control channel for power-saving signaling”. Technical Field

[0002] This application claims priority to U.S. Provisional Application No. 62 / 886,797 filed on August 14, 2019, and the invention is entitled “Mechanism for Determining Power Saving Signaling Offset” (hereinafter referred to as “797 Provisional Application”). The entire invention content of the 797 Provisional Application is incorporated herein by reference.

[0003] The present invention relates to wireless communication, and more particularly to a method and related equipment for monitoring a physical downlink control channel of power-saving signaling. Background Art

[0004] 3GPP provides a new study item on user equipment (UE) power saving in New Radio (NR). Power saving signaling is used to trigger UE to adapt to discontinuous reception (DRX) operation to reduce PDCCH monitoring opportunities. If the number of PDCCH monitoring opportunities is reduced, UE power consumption can be reduced.

[0005] Power saving signaling is configured outside the DRX activation time and is configured to the UE through a new downlink control information (DCI) format. Power saving signaling is also represented as a wake-up signal (WUS), which instructs the UE to wake up / monitor the PDCCH at the DRX activation time and / or instructs the UE to wake up / monitor the PDCCH in the turned-on state. The duration of the next DRX cycle. The DRX activation time of the UE may include:

[0006] 1. drx-onDurationTimer, drx-InactivityTimer, drx-RetransmissionTimerDL, drx-RetransmissionTimerUL, ra-ContentionResolutionTimer, or ra-ResponseWindow is running; or

[0007] 2. Send a scheduling request on the physical uplink control channel (PUCCH) and wait for processing; or

[0008] 3. Indicating that the new transmission PDCCH is addressed to, after successfully receiving a random access response to a random access preamble that was not selected by the Medium Access Control (MAC) entity in a contention-based random access preamble, the Cell Radio Network Temporary Identifier (C-RNTI) of the MAC entity that was not received.

[0009] Power saving signaling is only configured when DRX is configured. The UE may be configured with a control resource set (CORESET) and a search space (SS) set (e.g., a common search space (CSS) or a UE-specific search space (USS)) to monitor DCI formats for power saving signaling. Based on the current framework, a DCI format may be associated with an SS set. The UE may monitor the DCI format for power saving signaling based on the parameters configured for the associated SS set. However, there is no provision for the configuration of power saving signaling, so the UE may not know when to monitor the PDCCH for power saving signaling. Summary of the invention

[0010] The invention relates to a method for monitoring a physical downlink control channel of power-saving signaling and related equipment.

[0011] According to one embodiment of the present invention, the present invention provides a method for a user equipment (UE) to monitor a physical downlink control channel (PDCCH) for power saving signaling, comprising: receiving a discontinuous reception (DRX) configuration from a base station (BS) to configure the UE to listen to a scheduling signal on the PDCCH during a DRX activation time; and receiving a configuration from the BS to configure the UE to listen to the power saving signaling on the PDCCH and instruct the UE to wake up and listen to the scheduling signal during the DRX activation time, wherein the configuration includes a millisecond time before the start of the DRX on-duration and instructs the UE to start listening to the power saving signaling on the PDCCH.

[0012] According to another embodiment of the present invention, the present invention provides a user equipment (UE) for monitoring a physical downlink control channel (PDCCH) for power saving signaling, comprising: a processor for executing computer executable instructions; and a non-temporary machine-readable medium, coupled to the processor, for storing computer executable instructions, wherein the computer executable instructions instruct the processor to: receive a discontinuous reception (DRX) configuration from a base station (BS) to configure the UE to listen to a scheduling signal on the PDCCH during a DRX activation time; and receive a configuration from the BS to configure the UE to listen to the power saving signaling on the PDCCH and instruct the UE to wake up and listen to the scheduling signal at the DRX activation time, wherein the configuration includes a millisecond time before the start of the DRX on-duration, and instructs the UE to start listening to the power saving signaling of the PDCCH. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The following detailed description may be used to better understand the exemplary aspects of the present invention by referring to the accompanying drawings, wherein the various features in the drawings are not drawn to scale, and the sizes of the various features may be arbitrarily increased or decreased for the sake of clarity of discussion.

[0014] Figure 1is a flow chart illustrating physical sidelink feedback control channel (PSFCH) resource determination according to an example implementation of the present invention.

[0015] Figure 2A and Figure 2B is a schematic diagram illustrating PDCCH monitoring according to an example implementation of the present invention.

[0016] Figure 3A and Figure 3B is a schematic diagram illustrating a power-saving signaling configuration according to an example implementation of the present invention.

[0017] Figure 4A and Figure 4B is a schematic diagram illustrating a shift of a PDCCH monitoring opportunity according to an exemplary embodiment of the present invention.

[0018] Figure 5 is a schematic diagram illustrating a multiple transmission and reception point (TRP) system according to an example implementation of the present invention.

[0019] Figure 6 is a schematic diagram illustrating a plurality of power-saving signaling monitoring opportunities according to an example implementation of the present invention.

[0020] Figure 7 is a block diagram illustrating a node for wireless communication according to an example implementation of the present invention. DETAILED DESCRIPTION

[0021] The following description contains specific information related to exemplary embodiments of the present invention. The accompanying drawings and the detailed descriptions attached thereto are directed to exemplary embodiments. However, the present invention is not limited to these exemplary embodiments. Other variations and implementations of the present invention will occur to those skilled in the art. Unless otherwise indicated, the same or corresponding elements in the figures may be represented by the same or corresponding reference numerals. In addition, the drawings and illustrations are generally not drawn to scale and are not intended to correspond to actual relative sizes.

[0022] For the purpose of consistency and ease of understanding, similar features are identified by numbers in the exemplary figures (although in some cases, not shown). However, features in different embodiments may differ in other aspects and should not be narrowly limited to what is shown in the figures.

[0023] The phrases "in one embodiment" or "in some embodiments" may each refer to one or more of the same or different embodiments. The term "coupled" is defined as connected directly or indirectly through intermediate components and is not necessarily limited to physical connections. The term "comprising" means "including but not necessarily limited to" and specifically indicates open inclusion or membership in the above combinations, groups, series or equivalents.

[0024] In addition, any two or more of the following paragraphs, (sub) points, points, actions, behaviors, terms, alternatives, examples, or claims described in the following disclosure may be logically, reasonably, and appropriately combined to form a specific method. Any sentence, paragraph, (sub) bullet point, point, action, behavior, term, or claim described in the following disclosure may be implemented independently and separately to form a specific method. Dependencies, such as, for example, "according to", "more specifically", "preferably", "in one embodiment", "in one implementation", "in an alternative", etc., refer only to one possible example in the following disclosure, which will not limit the specific method.

[0025] For purposes of explanation and non-limiting, specific details such as functional entities, techniques, protocols, and standards are set forth to provide an understanding of the described technology. In other instances, detailed descriptions of well-known methods, techniques, systems, and architectures are omitted so as not to obscure the description with unnecessary detail.

[0026] Those skilled in the art will recognize that any described network function or algorithm can be implemented by hardware, software, or a combination of software and hardware. The described functions may correspond to modules as software, hardware, firmware, or any combination thereof. Software implementations may include computer executable instructions stored on a computer-readable medium such as a memory or other type of storage device. For example, one or more microprocessors or general-purpose computers with communication processing capabilities may be programmed with corresponding executable instructions and perform the described network functions or algorithms. The microprocessor or general-purpose computer may be formed by an application specific integrated circuit (ASIC), a programmable logic array, and / or using one or more digital signal processors (DSPs). Although some of the disclosed embodiments relate to software installed and executed on computer hardware, alternative embodiments as firmware or hardware or a combination of hardware and software are also within the scope of the present invention.

[0027] Computer readable media include, but are not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, compact disk (CD) read-only memory (CD ROM), magnetic tape, magnetic tape, disk storage, or any other equivalent medium capable of storing computer readable instructions.

[0028] A radio communication network architecture (e.g., a Long Term Evolution (LTE) system, an LTE-Advanced (LTE-A) system, an LTE-A Pro system, or a New Radio (NR) system) typically includes at least one base station (BS), at least one UE, and one or more optional network elements that provide connectivity to a network. The UE communicates with a network (e.g., a core network (CN), an evolved packet core (EPC) network, an evolved universal terrestrial radio access network (RAN) (E-UTRAN), a next generation (GN) core (NGC), a 5G CN (5GC), or the Internet of a RAN established through the BS.

[0029] In the present invention, UE may include but is not limited to a mobile station, a mobile terminal or device, a user communication radio terminal. For example, UE may be a portable radio device, including but not limited to a mobile phone, a tablet computer, a wearable device, a sensor, or a personal digital assistant (PDA) with wireless communication capabilities. UE is configured to receive and send signals to one or more cells in RAN over an air interface.

[0030] The BS may include, but is not limited to, a Node B (NB) such as in UMTS, an evolved Node B (eNB) such as in LTE-A, a Radio Network Controller (RNC) such as in UMTS, a BS Controller (BSC) such as in Global System for Mobile Communications (GSM) / GSM Enhanced Data Rates for GSM Evolution (EDGE) RAN (GERAN), a Next Generation (NG)-eNB and 5GC-related (E-UTRA) BS such as in Evolved Universal Terrestrial Radio Access, a Next Generation Node B (gNB) in 5G-RAN, and any other device capable of controlling radio communications and managing radio resources within a cell. The BS may be connected to a network via a wireless interface to provide services for one or more UEs.

[0031] The BS may be configured to provide communication services according to at least one of the following radio access technologies (RATs): Worldwide Interoperability for Microwave Access (WiMAX), GSM (commonly referred to as 2G), GERAN, General Packet Radio Service (GRPS), UMTS (commonly referred to as 3G) according to basic Wideband Code Division Multiple Access (W-CDMA), High Speed ​​Packet Access (HSPA), LTE, LTE-A, Evolved LTE (eLTE), New Radio (NR, commonly referred to as 5G) and / or LTE-A Pro. However, the scope of the present invention should not be limited to these protocols.

[0032] The BS is operable to provide radio coverage to a specific geographic area using multiple cells that form a RAN. The BS supports the operation of cells. Each cell is operable to provide service to at least one UE within the radio coverage of the cell. More specifically, each cell (commonly referred to as a serving cell) provides service to serve one or more UEs within the radio coverage of the cell (for example, each cell schedules downlink (DL) and optional uplink (UL) resources to at least one UE for DL ​​and optional UL packet transmission within the radio coverage of the cell). The BS can communicate with one or more UEs in the radio communication system via multiple cells. The cell can allocate side link (SL) resources to support proximity services (ProSe), LTE SL services, and LTE / NR V2X services. Each cell may have overlapping coverage areas with other cells

[0033] Figure 1 A method 100 for a UE to monitor a PDCCH for power saving signaling is illustrated. In action 102, the UE receives a DRX configuration from a BS to configure the UE to monitor a scheduling signal on a PDCCH during a DRX active time. In action 104, the UE receives a power saving signaling configuration from the BS to configure the UE to monitor a power saving signaling (e.g., DCI format 2_6) on a PDCCH, wherein the power saving signaling configuration includes a start of a time DRX on duration in milliseconds, indicating that the UE starts to monitor the power saving signaling (or referred to as a power saving signaling monitoring opportunity) of the PDCCH. In addition, the power saving signaling configuration may include a period and a duration of a power saving signaling monitoring opportunity.

[0034] Method 100 implements monitoring of the PDCCH of the power saving signaling according to the offset configured by the power saving signaling (or referred to as the power saving signaling offset). According to the offset (e.g., time in milliseconds), the power saving signaling monitoring opportunity is located before the DRX on duration. Therefore, the UE starts monitoring the PDCCH for the power saving signaling at a known offset before the DRX on duration.

[0035] In addition, the UE can report the UE capabilities to the BS when the UE is in a dormant state, when the UE is in a DRX off duration, the BS indicates the time required for the UE to wake up after receiving power saving signaling, or when the UE is outside the DRX active time. The number of required time can be a symbol, a time slot, a subframe, or an absolute time unit (e.g., ns, us, ms, etc.). Therefore, the BS can determine the power saving signaling configuration based on the time required by the UE capabilities.

[0036] The present invention provides a solution to the problem of how UE determines the monitoring time of power saving signaling and the resource location of power saving signaling. Figure 2AAs shown, at the power saving signaling monitoring opportunity outside the DRX activation time, the UE enters the first wake-up phase S1 to monitor the PDCCH (power level is higher than the UE's sleep state). In the first wake-up phase S1, the UE's capabilities may be strictly limited to save power. For example, the UE does not expect to receive the same time slot scheduling grant for the physical downlink shared channel (PDSCH). Therefore, in the first wake-up phase S1 (e.g., Figure 2A As shown, waking up from a sleep state to monitor power saving signaling), a lower power implementation timeline can be achieved by optimizing at least: (i) PDCCH processing, (ii) the amount of hardware that needs to be woken up / involved, (iii) the voltage / clock operating point of the hardware, and potentially (iv) the receive (RX) bandwidth and number of antennas. Only when the power saving signaling is decoded does the UE transition to the second wake-up stage S2, thereby waking up additional hardware and processing units (e.g., bandwidth part (BWP) / component carrier switching, channel state information reference signal (CSI)-RS processing), etc.) to prepare for DL / UL data scheduling. If the UE does not receive power saving signaling outside of the DRX activation time and / or the power saving signaling indicates that the UE remains dormant in DRX, the UE in the second wake-up stage S2 consumes additional power but can skip several subsequent DRX cycle active times / DRX on durations such as Figure 2B As shown, and / or there are no other events that require the UE to monitor the PDCCH. Therefore, the PDCCH monitoring opportunities are reduced (for example, the UE is in a sleep state at a low power level), thereby reducing the power consumption of the UE.

[0037] Note that the offset from the start symbol of the DRX Activation Time / DRX On Duration to the power saving signaling is explicitly indicated, for example, the time (in milliseconds) before the start symbol of the DRX On Duration is configured in the power saving signaling configuration.

[0038] A new Radio Resource Control (RRC) Information Element (IE) may be used to indicate an offset power saving signaling configuration. If there is an explicit offset in the power saving signaling configuration, the UE may monitor the power saving signaling before the offset from each DRX activation time / DRX on duration, such as Figure 3A However, if there is no explicit offset in the power saving signaling configuration, the UE may monitor the power saving signaling according to a predefined method. For example, the UE may regard the DL symbol located at the symbol closest to the start symbol of the upcoming DRX activation time / DRX on duration as the power saving signaling monitoring opportunity, such as Figure 3BAs shown. It should be noted that, in one implementation, the DL symbol may be a DL symbol configured by TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-dedicated. In some implementations, the DL symbol may be a DL symbol indicated by DCI format 2_0. In some embodiments, the last symbol of the power saving signaling monitoring opportunity is a DL symbol located on the symbol closest to the start of the upcoming DRX activity time / DRX duration. For other implementations, the UE may consider the DL symbol located on the DL symbol closest to the offset of each DRX activity time / DRX duration. It should be noted that in frequency division duplex (FDD) operation, the symbol closest to the power saving signaling is located on the starting symbol of the DRX activation time / DRX on duration. If the period of the power saving signaling configuration is different from the DRX cycle, the UE may not monitor the power saving signaling / DRX duration whose period interval between the power saving signaling and the DRX cycle is less than the offset from the starting symbol of the DRX activation time.

[0039] On the other hand, the offset may be configured by a new IE in the RRC configuration with different numerology. Various RRC configurations are disclosed.

[0040] 1. A new IE in the RRC configuration indicates the number of symbols of the offset between the start symbol of the DRX activation time / on-duration and the start symbol of the power saving signaling. In one example, only DL symbols are counted to determine the offset. In other examples, DL and / or UL and / or flexible (FL) symbols are counted to determine the offset.

[0041] 2. The new IE in the RRC configuration indicates the number of slots / subframes offset between the starting slot / subframe of the DRX active time / DRX on duration and the starting slot / subframe of the power saving signaling. It should be noted that the DRX active time is the legacy DRX active time defined in the NR Rel-15 technical standard. It should also be noted that the DRX on duration is the duration when the DRX-onDurationTimer is running. It should also be noted that the symbol position of the power saving signaling within the slot / subframe can be based on a predefined method. For example, the UE can monitor the power saving signaling only on some specific symbols (e.g., the first and second symbols of the slot). In some embodiments, the predefined method can be a rule for finding a suitable symbol for the power saving signaling. For example, the power saving signaling monitoring opportunity can be located on the symbol of the "DL" or "DL or FL" symbol closest to the starting symbol of the DRX active time / DRX on duration.

[0042] 3. A new IE in the RRC configuration indicates the number of symbols offset between the start symbol of the DRX on duration and the start symbol of the power saving signaling. Note that the UE may assume that the period of the power saving signaling is the same as the DRX cycle (eg, short DRX cycle or long DRX cycle).

[0043] 4. The new IE in the RRC configuration indicates the number of time slots / subframes that are offset between the starting time slot / subframe of the DRX on duration and the starting time slot / subframe of the power saving signaling. It should also be noted that the symbol position of the power saving signaling within the time slot / subframe can be based on a predefined method. In one implementation, the predefined method can include the UE monitoring the power saving signaling only on certain specific symbols (for example, the first and second symbols of the time slot). In some embodiments, the predefined method can be a rule for finding suitable symbols for the power saving signaling. For example, the power saving signaling monitoring opportunity can be located on the symbol of the "DL" or "DL or FL" symbol closest to the starting symbol of the DRX on duration.

[0044] In one implementation, the UE may autonomously transfer the timing for monitoring the PDCCH for power saving signaling, specifically, the power saving signaling monitoring timing. Figure 4A , the UE may be configured to monitor the power saving signaling on the PDCCH 420 according to the power saving signal offset. However, the UE may not need to monitor the power saving signaling on the symbols overlapping with the PDCCH 420. For example, the synchronization signal block (SSB) 410 is transmitted on the DL symbol of the time slot overlapping with the PDCCH 420, so the UE is configured to monitor the SSB 410. In this case, the UE may not have a monitoring opportunity for the power saving signaling before the upcoming DRX activation time / DRX on duration 460. Therefore, the UE will transfer the monitoring opportunity for the power saving signaling.

[0045] In another implementation, Figure 1 See Figure 4B, the UE may be configured to monitor power saving signaling on one or more monitoring occasions (e.g., PDCCH 480 and PDCCH 420) before the DRX active time / DRX on duration. However, depending on the power saving signal offset, the UE may not need to monitor the power saving signaling (e.g., PDCCH 420) on the symbol that is the closest symbol to the DRX activation time / DRX on duration of the time slot, but monitor the farthest symbol of the time slot for power saving signaling (e.g., PDCCH 480). In other cases, the UE may not need to monitor the power saving signaling on the symbol of the time slot farthest from the DRX active time / DRX duration (e.g., PDCCH 480). For example, SSB 410 is transmitted on the DL symbol of the time slot overlapping with PDCCH 420 for power saving signaling monitoring occasion, so the UE is configured to monitor SSB410. Therefore, the UE may need a rule to determine a new monitoring occasion for power saving signaling.

[0046] An example for autonomously changing power saving signaling monitoring timing is disclosed.

[0047] 1. When the UE is not required to monitor the power saving signaling in a symbol / time slot / subframe, the UE can autonomously transfer the monitoring opportunity of the power saving signaling from the original position to the nearest DL / (DL or FL) symbol. It should be noted that the DL / (DL or FL) symbol closest to the original position of the power saving signaling can be located in the same time slot or a different time slot. It should be noted that if the UE can iteratively determine the resource allocation of the power saving signaling until the UE can monitor the power saving signaling on those symbols / time slots / subframes. In one implementation, the last symbol of the power saving signaling monitoring opportunity is a DL symbol located on the symbol closest to the start of the upcoming DRX active time / DRX duration.

[0048] 2. When the UE is not required to monitor the power saving signaling in a symbol / time slot / subframe, the UE may autonomously transfer the monitoring timing of the power saving signaling from the original monitoring timing to the nearest monitoring timing located before the start symbol of the DRX activation time / DRX on duration. It should be noted that if the UE can iteratively determine a new monitoring timing of the power saving signaling, until the UE can monitor the power saving signaling at the monitoring timing.

[0049] 3. When the UE is not required to monitor the power saving signaling in the symbol / time slot / subframe, the UE may ignore (or skip monitoring) the power saving signaling in the symbol / time slot / subframe. More specifically, if the UE ignores (or skips monitoring) the power saving signaling, the UE may need to wake up at the upcoming DRX active time / on duration.

[0050] If the UE cannot decode / does not need to monitor power saving signaling, the UE may determine that there is no corresponding data scheduled in the upcoming DRX active time / on duration and remain dormant. In addition, if the UE cannot decode / does not need to monitor power saving signaling, and the number / count of consecutive events (i.e., the UE cannot monitor power saving signaling) is greater than a threshold, the UE may perform cell selection or automatically release to an inactive / idle state.

[0051] In some implementations, the UE may be configured with measurement gaps. During the measurement gaps (e.g., within the corresponding time / frequency range of the measurement gaps), the UE may or may not perform certain DL (e.g., PDCCH monitoring, DL-SCH reception) and / or UL transmissions (e.g., transmission of HARQ feedback, SR, CSI, sounding reference signal (SRS) reporting, UL-SCH transmission).

[0052] If the power saving signaling monitoring occasion overlaps with the measurement gap, the UE may need to monitor the PDCCH for power saving signaling during the measurement gap (eg, on the configured power saving signaling monitoring occasion). In other words, the measurement gap does not affect the PDCCH monitoring behavior for power saving signaling.

[0053] On the other hand, the UE may not need to monitor the PDCCH for power saving signaling (e.g., on a configured power saving signaling monitoring opportunity) during the measurement gap, and the UE may ignore the power saving signaling monitoring opportunity during the measurement gap. Therefore, the UE may need to wake up at the upcoming DRX activation time / DRX on duration. In other words, the UE may wake up even if the UE does not receive power saving signaling during the measurement gap. Alternatively, the UE may not need to wake up at the upcoming DRX activation time / DRX on duration. In other words, the UE may believe that the power saving signaling is lost (or indicates that the UE is dormant) during the measurement gap.

[0054] It is important to note that the UE may not need to monitor power saving signaling in certain specific symbols / time slots / subframes in at least one of the following cases:

[0055] 1. If the UE has received ssb-PositionsInBurst in system information block 1 (SIB1) and has not received ssb-PositionsInBurst in ServingCellConfigCommon of the serving cell and if at least one resource element (RE) used for power saving signaling overlaps with at least one RE corresponding to the SS / physical broadcast channel (PBCH) block index provided by ssb-PositionsInBurst in SIB1, the UE does not need to listen to the power saving signaling.

[0056] 2. If the UE has received ssb-PositionsInBurst for the serving cell in ServingCellConfigCommon, and if at least one RE used for power saving signaling overlaps with at least one RE corresponding to the SS / PBCH block index provided by ssb-PositionsInBurst in ServingCellConfigCommon, the UE does not need to monitor the power saving signaling.

[0057] 3. If at least one RE used for power saving signaling on the serving cell overlaps with at least one RE of lte-CRS-ToMatchAround, the UE does not need to monitor the power saving signaling.

[0058] 4. If at least one RE used for power saving signaling on the serving cell overlaps with at least one UL or FL OFDM symbol, the UE does not need to monitor the power saving signaling.

[0059] 5. If the monitoring opportunity of the serving cell power saving signaling is abandoned because the number of monitored PDCCH candidates or the control channel element (CCE) channel estimation exceeds the UE capability, the UE is not required to monitor the power saving signaling.

[0060] 6. If the UE configures measurement gaps on the serving cell, for example via measGapConfig, and if at least one RE used for power saving signaling on the serving cell overlaps with the time / frequency range of the measurement gaps, the UE does not need to monitor the power saving signaling.

[0061] Furthermore, the present invention discloses a method for configuring power saving signaling.

[0062] 1. The IE in the search space configuration instructs the UE to monitor power saving signaling.

[0063] 2. A new search space type (eg, power saving) instructs the UE to monitor power saving signaling.

[0064] 3. The new search space type is a combination of the traditional search space type and power saving signaling (for example, "UE-Specific-and-power-saving-signaling" or "common-and-power-saving-signaling"). For the case of "UE-Specific-and-power-saving-signaling", the UE can determine the PDCCH monitoring timing of the power saving signaling as the UE-specific search space (USS). It should be noted that when the UE is in DRX active time / DRX on-duration, the UE may expect to monitor "DCI format 0_0 / 0_1" or "DCI format 1_0 / 1_1", and the UE may expect to monitor "power Saving signaling" when the UE is outside the DRX active time / DRX duration. For the case of "common-and-power-saving-signaling", the UE can determine the PDCCH monitoring timing of the power saving signaling as the common search space (CSS). It should be noted that when the UE is in the DRX activation time / DRX on duration, the UE may expect to monitor "DCI format 0_0" or "DCI format 1_0" or "DCI format 2_0 / 2_1 / 2_2 / 2_3", and when the UE is outside the DRX active time / DRX duration, the UE may expect to monitor "power saving signaling".

[0065] 4. A new IE for search space configuration indicates whether the search space is also power-saving signaling.

[0066] 5. The new DCI format is a combination of a legacy DCI format and power saving signaling (e.g., DCI format 0_0 / 0_1 and DCI format for PS, DCI format 1_0 / 1_1 and DCI format for PS, DCI format 2_0 and DCI format for PS, DCI format 0_0 / DCI format 1_0 and DCI format for PS, DCI format 2_1 and DCI format for PS, DCI format 2_2 and DCI format for PS, or DCI format 2_3 and DCI format for PS). It should be noted that when the UE is in the DRX activation time / DRX on duration, the UE may expect to monitor the legacy DCI format, and when the UE is outside the DRX activation time / DRX on time, the UE may expect to monitor the power saving signaling.

[0067] 6. The DCI format for power saving signaling configuration may include an SCell / BWP index, and the UE may wake up at the DRX activation time / DRX on-duration and monitor the PDCCH candidate-specific power saving signal on the SCell / BWP indicated by the UE.

[0068] 7. There can be multiple new DCI formats for power saving signaling configuration. One DCI format is a UE-specific DCI format (i.e., a DCI format in the USS), and the other is a group common DCI format (e.g., DCI format 2_0 / 2_1 / 2_2). The UE may have different behaviors when waking up during the DRX active time / DRX duration. For example, if the UE-specific power saving signaling includes an SCell / BWP index, the UE may wake up at the DRX activation time / DRX duration and monitor PDCCH candidates on the SCell / BWP indicated by the UE-specific power saving signaling. On the other hand, if the group common power saving signaling includes only a single bit (e.g., T / F, "T" indicates that the UE wakes up, and "F" indicates that the UE does not wake up), the UE may wake up in the DRX active time / DRX duration and monitor PDCCH candidates only on the PCell or on the cell / BWP to receive the power saving signaling.

[0069] 8. The new DCI format for power saving signaling configuration may be UE-specific or group-common. When the UE is outside the DRX activation time / DRX on duration, the UE may expect to use the first RNTI to descramble the DCI format, and when the UE is outside the DRX activation time / DRX duration, the UE may expect to use the second RNTI to descramble the DCI format. The UE is in the DRX active time / DRX duration. It should be noted that the first RNTI is a PS-RNTI, which is different from the second RNTI (for example, the second RNTI may be a C-RNTI, or a configuration scheduling RNTI (CS-RNTI), a modulation and coding mode RNTI (MCSRNTI), a time slot format indication RNTI (SFI-RNTI), an interruption RNTI (INT-RNTI), a transmit power control PUCCH RNTI (TPC-PUCCH-RNTI), a TPC-SRS-RNTI, or a TPC physical uplink shared channel RNTI (TPC-PUSCH-RNTI)).

[0070] In one implementation, the UE may monitor power saving signaling in multiple transmission and reception points (TRPs) / panels scenarios. Figure 5 As shown, the UE may be configured to monitor power saving signals from multiple TRPs (e.g., TRP 500 and TRP 502). Figure 5In the embodiment, the UE is associated with two TRPs, and the UE can monitor PDCCH 520 on TRP 500 and PDCCH 522 on TRP 502. If the UE detects a power saving signaling duration on PDCCH 520 that instructs the UE to wake up outside the DRX active time / DRX, but also detects a power saving signaling on PDCCH 522 that instructs the UE not to wake up outside the DRX active time / DRX duration, the UE may not know whether to wake up to monitor the power saving signal. Therefore, the present invention further provides a solution for power saving signaling monitoring in multiple TRPs.

[0071] 1. The UE may desire to monitor power saving signaling on only one TRP / one CORESET outside of the DRX active time / DRX on duration. In other words, there may be one or more CORESET configurations, including power saving signaling configurations, but the UE monitors only one of them outside of the DRX active time / DRX on duration. In one example, the only one TRP is the primary TRP (e.g., the primary TRP is the first TRP to which the UE attaches after the initial access procedure).

[0072] 2. The power saving signaling sent by only one TRP can contain TRP information, and the UE can wake up and monitor the PDCCH at the DRX activation time / DRX on duration on the TRP according to the TRP information.

[0073] 3. The UE may wish to monitor power saving signaling on all TRPs / all CORESETs outside of the DRX Active Time / DRX On Duration.

[0074] 4. The UE is only expected to wake up and monitor the PDCCH on the TRP / CORESET where the UE receives power saving signaling.

[0075] 5. The UE may wish to monitor power saving signaling on all TRPs / all CORESETs outside the DRX Active Time / DRX On Duration. If any of the power saving signaling detected outside the DRX Active Time / DRX On Duration instructs the UE to wake up, the UE may wake up and monitor the PDCCH during the DRX Active Time / DRX On Duration.

[0076] 6. The UE may wish to monitor power saving signaling on all TRPs / all CORESETs outside of the DRX active time / DRX duration. If all power saving signaling detected outside of the DRX active time / DRX on duration instructs the UE to wake up, the UE may wake up and monitor the PDCCH during the DRX active time / DRX on duration.

[0077] It should be noted that in order to support multi-PDCCH based multi-TRP / panel transmission with intra-cell (e.g., same cell ID) and inter-cell (e.g., different cell IDs), RRC configuration can be used to associate multiple PDCCH / PDSCH with multiple TRPs. Specifically, one CORESET in "PDCCH-config" corresponds to one TRP.

[0078] It should be noted that effective power saving signaling is power saving signaling other than power saving signaling, and the UE does not need to monitor in certain specific symbols / time slots / subframes.

[0079] It should be noted that the most recent valid power saving signaling monitoring opportunity is the power saving signaling monitoring opportunity whose occupied OFDM symbol is closest to the start symbol of the DRX activation time / DRX on duration or has the smallest timing, and the offset of the DRX active time / DRX on duration between all power saving signals.

[0080] It should be noted that the most recent valid power saving signaling is determined on a per-TRP / CORESET basis and if any of the most recent valid power saving signaling instructs the UE to wake up, the UE must wake up and monitor all TRPs and CORESETs.

[0081] It should be noted that if the UE has the capability of multiple antenna panels (for example, the UE is configured with one or more antenna panel IDs, or the UE is configured with more than one SRS resource set ID representing different antenna panels), the UE may only expect to monitor the power saving signaling on the CORESET associated with the active antenna panel outside the DRX active time / DRX on Duration. The relationship between the antenna panel and the CORESET can be determined by the spatial domain information. For example, if the spatial domain information of antenna panel #1 is associated with CSI-RS #1 and the spatial domain information of CORESET #1 is also associated with CSI-RS #1, the UE can determine that CORESET #1 is associated with antenna panel #1.

[0082] In some embodiments, multiple power saving signaling monitoring opportunities are outside the DRX active time / DRX on duration. The UE may detect multiple power saving signals before the DRX activation time / DRX on duration, which may affect the UE's wake-up behavior during the subsequent DRX activation time / DRX on duration. For example, the UE can configure the power saving signaling as a search space (set), and the period of the search space (set) can be 20ms. In addition, the UE can be configured with a DRX period equal to 40ms. As shown in the figure. Figure 6In the embodiment, PDCCH 620 and PDCCH 622 include power saving signaling sent before the DRX active time, respectively. If the UE detects power saving signaling indicating that the UE wakes up on PDCCH 620 but the UE also detects power saving signaling indicating that the UE does not wake up on PDCCH 622, the power consumption of the UE may increase due to unnecessary wake-ups. (Hardware or RF) is used for power saving signaling monitoring on PDCCH 620. Therefore, the present application further provides a power saving signaling monitoring solution under multiple power saving signaling monitoring occasions.

[0083] 1. The UE only needs to monitor the valid power saving signaling at the monitoring opportunity located on the symbol closest to the start symbol of the DRX activation time / DRX on time. In one example, there may be an offset, and the time difference between the latest valid power saving signaling and the start symbol of the DRX activation time / DRX on duration will be greater than the offset. Note that the time unit of the offset can be symbol / time slot / subframe.

[0084] 2. Monitoring power saving signaling outside the DRX activation time / DRX on duration depends on the UE implementation. The UE can determine whether to wake up based on the most recent valid power saving signaling outside the DRX activation time / DRX on duration. In addition, there may be an offset, and the time difference between the most recent valid power saving signaling and the start symbol of the DRX activation time / DRX on duration will be greater than the offset. Note that the time unit of the offset can be symbol / time slot / subframe.

[0085] 3. The UE may expect to detect only one power saving signaling outside the DRX activation time / DRX on Duration. If the UE detects multiple power saving signals outside the DRX active time / DRX on Duration, the UE may determine that this is an error condition.

[0086] 4. If any of the power saving signaling detected outside the DRX activation time / DRX on duration instructs the UE to wake up, the UE may wake up and monitor the PDCCH during the DRX activation time / DRX on duration.

[0087] 5. If all power saving signals detected outside the DRX activation time / DRX on duration instruct the UE to wake up, the UE may wake up and monitor the PDCCH during the DRX activation time / DRX on duration.

[0088] It should be noted that effective power saving signaling is power saving signaling other than power saving signaling in some specific symbols / time slots / subframes that does not require UE monitoring.

[0089] Figure 7 A node 700 for wireless communication according to the present invention is illustrated.

[0090] As shown in the figure. Figure 7 , the node 700 may include a transceiver 720, a processor 726, a memory 728, one or more presentation components 734, and at least one antenna 736. The node 700 may also include a radio frequency (RF) spectrum band module, a BS communication module, a network communication module, and a system communication management module, an input / output (I / O) port, an I / O component, and a power supply (not shown). Each of these components may communicate with each other directly or indirectly via one or more buses 740. The node 700 may be a UE that performs various disclosed functions, such as Figure 7 shown.

[0091] The transceiver 720 includes a transmitter 722 (with a transmitting circuit) and a receiver 724 (with a receiving circuit) and can be configured to transmit and / or receive time and / or frequency resource partitioning information. The transceiver 720 can be configured to transmit in different types of subframes and time slots, including but not limited to available, unavailable and flexibly available subframe and time slot formats. The transceiver 720 can be configured to receive data and control channels.

[0092] Node 700 may include a variety of computer-readable media. Computer-readable media may be any media that node 700 can access and include volatile and non-volatile media, removable and non-removable media. Computer-readable media may include computer storage media and communication media. Computer storage media include volatile and non-volatile, and removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data.

[0093] Computer storage media include RAM, ROM, EEPROM, flash memory or other storage technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, cassettes, magnetic tape, disk storage or other magnetic storage devices. Computer storage media do not include propagated data signals. Communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and includes any information delivery media. The term "modulated data signal" refers to a signal that has one or more of its characteristics set or changed in such a manner as to encode the information in the signal. Communication media includes wired media such as a wired network or direct wired connection, and wireless media such as acoustic, RF, infrared and other wireless media. Any combination of the disclosed media should be included within the scope of computer readable media.

[0094] The memory 728 may include computer storage media in the form of volatile and / or non-volatile memory. The memory 728 may be removable, non-removable, or a combination thereof. Memory includes solid-state memory, hard drives, and optical drives. Figure 7 As shown, the memory 728 can store computer-readable, computer-executable instructions 732 (e.g., software code) that are configured to cause the processor 726 (e.g., processing circuit) to perform various disclosed functions. Alternatively, the instructions 732 can be configured to cause the node 700 (e.g., when compiled and executed) to perform various disclosed functions.

[0095] The processor 726 may include an intelligent hardware device (e.g., a central processing unit (CPU), a microcontroller, an ASIC, etc.). The processor 726 may include a memory. The processor 726 may process data 730 and instructions 732 received from the memory 728, as well as information received via the transceiver 720, the baseband communication module, and / or the network communication module. The processor 726 may also process information to be sent to the transceiver 720 for transmission to the network communication module via the antenna 736 for transmission to the CN.

[0096] One or more presentation components 734 present data to a person or other device. Presentation components 734 include display devices, speakers, printing components, and vibration components.

[0097] According to the present invention, it is obvious that various technologies can be utilized to realize the concepts of the present invention without departing from the scope of those concepts. In addition, although these concepts have been described with specific reference to certain embodiments, those of ordinary skill in the art will recognize that changes can be made in form and detail without departing from the scope of these concepts. Therefore, the present invention is considered to be illustrative and not restrictive in all aspects. It should also be understood that the present invention is not limited to the embodiments specifically described, and many rearrangements, modifications and replacements are possible without departing from the scope of the present invention.

Claims

1. A method for a base station BS to instruct a user equipment UE to monitor a physical downlink control channel PDCCH to obtain power saving signaling, characterized in that: The method comprises receiving UE capability information from the UE, the UE capability information including a time required for the UE to wake up after receiving the power saving signaling; Sending a discontinuous reception (DRX) configuration to the UE, used to configure the UE to monitor a scheduling signal on the PDCCH during a DRX active time; Determine a power saving signaling configuration according to the required time, the power saving signaling configuration comprising a time offset before the start of the DRX on duration, used to instruct the UE to start monitoring the power saving signaling of the PDCCH; as well as The power saving signaling configuration is transmitted to instruct the UE to wake up so as to monitor the scheduling signal within the DRX active time.

2. The method according to claim 1, characterized in that: in, The DRX active time includes at least one of a DRX on duration timer, a DRX inactivity timer, a DRX retransmission timer, a random access contention resolution timer, a running random access response window, a duration for sending pending scheduling requests on a physical uplink control channel PUCCH, and a duration for not receiving a PDCCH indicating a new transmission addressed to a cell radio network temporary identifier C-RNTI of a MAC entity after successfully receiving a random access response to a random access preamble that was not selected by a media access control MAC entity in a contention-based random access preamble.

3. The method according to claim 1, characterized in that: in, The number of times required is one of symbol, slot, subframe and time unit.

4. The method according to claim 1, characterized in that: in, The DRX on-duration timer runs during the DRX on-duration.

5. A base station BS, characterized in that: include a transceiver; a processor coupled to the transceiver and configured to execute computer executable instructions; and a non-transitory machine-readable medium, coupled to the processor, for storing the computer-executable instructions, wherein the computer-executable instructions instruct the processor to: receiving, by the transceiver, UE capability information from the UE, the UE capability information including a time required for the UE to wake up after receiving the power saving signaling; Sending a discontinuous reception (DRX) configuration to the UE through the transceiver, for configuring the UE to monitor a scheduling signal on the PDCCH during a DRX active time; Determine a power saving signaling configuration according to the required time, the power saving signaling configuration comprising a time offset before the start of the DRX on duration, used to instruct the UE to start monitoring the power saving signaling of the PDCCH; as well as The power saving signaling configuration is transmitted by the transceiver to instruct the UE to wake up so as to monitor the scheduling signal within the DRX active time.

6. The base station according to claim 5, characterized in that: in, The DRX active time includes at least one of a DRX on duration timer, a DRX inactivity timer, a DRX retransmission timer, a random access contention resolution timer, a running random access response window, a duration for sending pending scheduling requests on a physical uplink control channel PUCCH, and a duration for not receiving a PDCCH indicating a new transmission addressed to a cell radio network temporary identifier C-RNTI of a MAC entity after successfully receiving a random access response to a random access preamble that was not selected by a media access control MAC entity in a contention-based random access preamble.

7. The base station according to claim 5, characterized in that: in, The number of times required is one of symbol, slot, subframe and time unit.

8. The base station according to claim 5, characterized in that: in, The DRX on-duration timer runs during the DRX on-duration.

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