Wireless communication methods, apparatus, and computer-readable storage media

Abstract

This application provides a wireless communication method, apparatus, and computer-readable storage medium, and specifically describes a technique for a user equipment (UE) to select a listening mode for a control channel based on information received by the UE. The UE can select a listening mode from multiple listening modes for one or more control channels. Furthermore, the UE listens to the control channel according to the listening mode.

Description

[0001] This application is a divisional application of Chinese patent application No. 201980095225.0, filed on April 2, 2019, entitled "Control Information Processing". Technical Field

[0002] This disclosure is generally directed to digital wireless communications. Background Technology

[0003] Mobile telecommunications technologies are propelling the world toward an increasingly connected and networked society. Compared to existing wireless networks, next-generation systems and wireless communication technologies will need to support a wider range of use case characteristics and provide access to a more complex and sophisticated range of requirements and flexibility.

[0004] Long-Term Evolution (LTE) is a wireless communication standard for mobile devices and data terminals developed by the 3rd Generation Partnership Project (3GPP). LTE Advanced (LTE-A) is a wireless communication standard that enhances the LTE standard. The fifth-generation wireless system (known as 5G) advances the LTE and LTE-A wireless standards and aims to support higher data rates, massive connectivity, ultra-low latency, high reliability, and other emerging service requirements. Summary of the Invention

[0005] Techniques for monitoring the Physical Downlink Control Channel (PDCCH) to save power consumption are disclosed. An exemplary wireless communication method includes: a user equipment selecting a monitoring mode for the control channel based on information received by the user equipment, wherein the monitoring mode is selected from a plurality of monitoring modes for one or more control channels; and monitoring the control channel according to the monitoring mode.

[0006] In a first embodiment of some examples, the selected monitoring mode is one of a first monitoring mode that skips control channel monitoring and a second monitoring mode that does not support skipping control channel monitoring. In the first embodiment, the first parameter set of the first monitoring mode includes: the starting position when skipping control channel monitoring, or the duration of skipping control channel monitoring, or a parameter associated with a timer, and the second parameter set of the second monitoring mode includes: the control channel monitoring period, or the starting position offset, or the monitoring duration in the period, or the monitoring symbol of the time slot in the monitoring duration.

[0007] In the first embodiment, the starting position is not less than 0 or is a null value, and the duration of skipping control channel monitoring is not less than 0 or equal to 2 seconds. nThe number of time slots that are multiples of α, where α is an integer not less than 0, and n is an integer not less than 0 and not greater than 10. The control channel monitoring period is the number of time slots greater than 0 time slots. The starting position offset is less than the control channel monitoring period, and the monitoring duration is the number of time slots greater than 0 and not greater than the control channel monitoring period. And the starting time slot index of the monitoring duration is associated with the control channel monitoring period and the starting position offset.

[0008] In a second implementation manner of some embodiments, the selected monitoring mode is one of a first monitoring mode of reducing the control channel monitoring frequency and a second monitoring mode of not reducing the control channel monitoring frequency. In the second implementation manner, the first parameter set of the first monitoring mode includes: a first control channel monitoring period Ks1, or a starting position offset, or a first monitoring duration Ts1 in the period, or the monitoring symbol of the time slots in the first monitoring duration. The second parameter set of the second monitoring mode includes: a second control channel monitoring period Ks2, or a starting position offset, or a second monitoring duration Ts2 in the period, or the monitoring symbol of the time slots in the second monitoring duration, where Ks1 > Ks2 or Ts1 < Ts2, or where the control channel monitoring frequency is a value obtained by dividing the first monitoring duration in the period by the first control channel monitoring period or by dividing the second monitoring duration in the period by the second control channel monitoring period.

[0009] In the second implementation manner, the first control channel monitoring period or the second control channel monitoring period is the number of time slots greater than 0 time slots. The starting position offset is less than the first control channel monitoring period or the second control channel monitoring period. The first monitoring duration is the number of time slots greater than 0 and not greater than the first control channel monitoring period. The second monitoring duration is the number of time slots not less than 0 and not greater than the second control channel monitoring period. And the starting time slot index of the first monitoring duration or the second monitoring duration is respectively associated with the first control channel monitoring period or the second control channel monitoring period and the starting position offset.

[0010] In the second implementation manner, the parameter set of the first monitoring mode includes: a correction factor δ of the control channel monitoring frequency, or a control channel monitoring period offset, or the starting position of the modified control channel monitoring frequency, or the stopping position of the modified control channel monitoring frequency, or the duration of the modified control channel monitoring frequency, where the control channel monitoring frequency is a value obtained by dividing the monitoring duration in the period by the control channel monitoring period.

[0011] In the second embodiment, the correction factor is 2. n Where n is not greater than 0, the control channel monitoring period offset is associated with δ and is a time slot number greater than 0, the starting position of the corrected control channel monitoring frequency is associated with the control channel monitoring period offset, the ending position of the corrected control channel monitoring frequency is associated with the control channel monitoring period offset, and the duration of the corrected control channel monitoring frequency is a time slot number greater than 0.

[0012] In a third embodiment of some examples, the selected monitoring mode is a first monitoring mode that skips the control channel monitoring mode and a second monitoring mode that reduces the control channel monitoring frequency. In the third embodiment, the first parameter set of the first monitoring mode includes: the starting position when skipping control channel monitoring, or the duration of skipping control channel monitoring, or a parameter associated with a timer; the second parameter set of the second monitoring mode includes: the control channel monitoring period, or the starting position offset, or the monitoring duration in the period, or the monitoring symbol of the time slot in the monitoring duration; and wherein the control channel monitoring frequency is a value obtained by dividing the monitoring duration in the period by the control channel monitoring period.

[0013] In the third embodiment, the starting position is not less than 0 or is empty, and the duration of skipping control channel monitoring is not less than 0 or equal to 2. n The number of time slots is a multiple of α, where α is an integer not less than 0 and n is an integer not less than 0 and not greater than 10. The control channel monitoring period is the number of time slots greater than 0. The starting position offset is less than the control channel monitoring period. The monitoring duration is the number of time slots greater than 0 and not greater than the control channel monitoring period. The starting time slot index of the monitoring duration is associated with the control channel monitoring period and the starting position offset.

[0014] In the third embodiment, the parameter set of the second monitoring mode includes: a correction factor δ for the control channel monitoring frequency, or a control channel monitoring period offset, or a start position of the corrected control channel monitoring frequency, or a stop position of the corrected control channel monitoring frequency, or a duration of the corrected control channel monitoring frequency, wherein the control channel monitoring frequency is a value obtained by dividing the monitoring duration in the period by the control channel monitoring period.

[0015] In the third embodiment, the correction factor δ is 2. n, where n is not greater than 0, the control channel monitoring period offset is the number of time slots greater than 0 and associated with δ, the starting position of the modified control channel monitoring frequency is associated with the control channel monitoring period offset, the stopping position of the modified control channel monitoring frequency is associated with the control channel monitoring period offset, and the duration of the modified control channel monitoring frequency is the number of time slots greater than 0.

[0016] In a fourth implementation manner of some embodiments, the selected monitoring mode is one of a first monitoring mode that reduces the control channel monitoring frequency using a first type of parameter and a second monitoring mode that reduces the control channel monitoring frequency using a second type of parameter. In the fourth implementation manner, the first parameter set of the first monitoring mode includes: a first control channel monitoring period Ks1, or a starting position offset, or a first monitoring duration Ts1 in the period, or a monitoring symbol of a time slot in the monitoring duration, the second parameter set of the second monitoring mode includes: a second control channel monitoring period Ks2, or a starting position offset, or a second monitoring duration Ts2 in the period, or a monitoring symbol of a time slot in the monitoring duration, and wherein, the control channel monitoring frequency is a value obtained by dividing the first monitoring duration in the period by the first control channel monitoring period or by dividing the second monitoring duration in the period by the second control channel monitoring period.

[0017] In the fourth implementation manner, the first control channel monitoring period of the first type of parameter is different from the second control channel monitoring period of the second type of parameter, the first monitoring duration is different from the second monitoring duration, and the control channel monitoring frequency of the first monitoring mode is different from the control channel monitoring frequency of the second monitoring mode, and Ts1 / Ks1 > Ts2 / Ks2, or Ks1 < Ks2, or Ts1 > Ts2. In the fourth implementation manner, the first control channel monitoring period or the second control channel monitoring period is the number of time slots greater than 0 time slots, the starting position offset is less than the control channel monitoring period, the first monitoring duration or the second monitoring duration is the number of time slots not less than 0 and not greater than the control channel monitoring period, and the starting time slot index of the first monitoring duration or the second monitoring duration is respectively associated with the first control channel monitoring period or the second control channel monitoring period and the starting position offset.

[0018] In some embodiments, the first parameter set, the second parameter set, or the parameter set itself are provided by search space information in radio resource control (RRC) signaling, by a medium access control-control element (MAC CE), or by layer 1 (L1) signaling. In some embodiments, the information includes: downlink control information (DCI) format information, or search space type information, or a radio network temporary identifier (RNTI), or a wake-up signal bearer instruction, or a user equipment identifier. In some embodiments, the information includes: the start time and length in the time domain, or the number of physical resource blocks in the frequency domain, or the bandwidth part index (BWP ID), or the control resource set index (CORESET ID), or the carrier index (carrier ID), or the subcarrier spacing (SCS), or the aggregation level (AL), or the frequency range type (FR type), or the rank indication (RI), or the number of antenna ports, or the precoding codebook index (PMI).

[0019] In some embodiments, the information includes service type, power saving strategy, or power saving parameters of the power saving strategy. In some embodiments, the information includes: channel state information reference signal (CSI-RS), demodulation reference signal (DMRS), hybrid automatic repeat request acknowledgment (HARQ-ACK), synchronization reference signal (TRS), or sounding reference signal (SRS). In some embodiments, the information includes: radio resource control (RRC) layer control signaling or Layer 3 signaling, intermediate access control layer control information or Layer 2 signaling, or downlink control information (DCI) or Layer 1 signaling. In some embodiments, the information indicates the control channel listening mode of the user equipment or a group of one or more user equipments, and the group of user equipments is grouped by the base station according to one or more parameters associated with the group of user equipments.

[0020] In some embodiments, the one or more parameters include: User Equipment Identifier (UE ID), or Radio Network Temporary Identifier (RNTI), or Power Saving RNTI, or Service Type Priority. In some embodiments, the control channel is a Physical Downlink Control Channel (PDCCH).

[0021] In yet another exemplary aspect, the methods described above are embodied in processor-executable code and stored in a computer-readable program medium. Thus, the computer-readable program storage medium may have code stored thereon, wherein, when executed by a processor, the code causes the processor to implement the methods described in this invention.

[0022] In yet another exemplary embodiment, an apparatus configured or operable to perform the methods described above is disclosed.

[0023] The above and other aspects and their embodiments are described in more detail in the accompanying drawings, description and claims. Attached Figure Description

[0024] Figure 1A This demonstrates a common snooping technique for listening to the PDCCH using a discontinuous reception (DRX) configuration.

[0025] Figure 1B This demonstrates a standard listening technique for monitoring the PDCCH without a DRX configuration.

[0026] Figure 2 An exemplary power-saving technique for PDCCH monitoring is shown.

[0027] Figure 3 A flowchart is shown showing how a base station sends downlink control information (DCI) to a user equipment (UE).

[0028] Figure 4 An exemplary technique is shown for a UE to determine a PDCCH listening method or mode on the UE side.

[0029] Figure 5 An exemplary sequence diagram is shown in which the base station instructs the UE on a PDCCH monitoring method based on the report information received from the UE.

[0030] Figure 6 An exemplary power-saving scheme configured with DRX is shown.

[0031] Figure 7 An exemplary power-saving scheme without configuring DRX is shown.

[0032] Figure 8 An exemplary technique for configuring a PDCCH listening method is shown.

[0033] Figure 9 Another exemplary power-saving scheme configured with DRX is shown.

[0034] Figure 10 Another exemplary power-saving scheme without configuring DRX is shown.

[0035] Figure 11 This demonstrates yet another exemplary power-saving solution configured with DRX.

[0036] Figure 12 This demonstrates yet another exemplary power-saving scheme without configuring DRX.

[0037] Figure 13 An exemplary flowchart for listening to the control channel is shown.

[0038] Figure 14 An exemplary block diagram of a hardware platform that may be part of a network node or a user device is shown. Detailed Implementation

[0039] In existing Long Term Evolution (LTE) and 5G New Radio Access (NR) communication systems, User Equipment (UE) needs to know the uplink scheduling authorization information for transmitting the Physical Uplink Shared Channel (PUSCH) and the downlink scheduling allocation information for receiving the Physical Downlink Shared Channel (PDSCH). This information is included in the Downlink Control Information (DCI) and is sent by the base station to the UE in different DCI formats on the PDCCH channel. Therefore, the UE should first listen to the PDCCH.

[0040] UE PDCCH monitoring can be performed at PDCCH monitoring times within the control resource set and search space set. The SearchSpace field in the Radio Resource Control (RRC) signaling includes relevant PDCCH monitoring parameters, where the searchSpaceId and controlResourceSetId information elements (IE) indicate the search space set index and CORESET applicable to PDCCH monitoring within that SearchSpace. The searchSpaceType IE in the SearchSpace field indicates the search space type of the PDCCH the UE is monitoring; that is, the common search space / UE-specific search space corresponds to different DCI formats to be detected, and the UE-specific search space contains fewer DCI formats.

[0041] The duration IE of the RRC signaling is T. s <k s The duration indicates the number of time slots in the PDCCH of the UE's listening search space set s; monitoringSlotPeriodicityAndOffset IE indicates k s The PDCCH listening period of the time slot and o s The PDCCH monitoring offset of the time slot; monitoringSymbolsWithinSlot indicates one or more first symbols of CORESET within the time slot used for PDCCH monitoring. One or more specific PDCCH monitoring times can be obtained as follows. For the search space set s, the UE determines if... Then in the number n f The frame number is There are one or more PDCCH listening opportunities within the time slot. UE from the time slot Start listening for T s The PDCCH of the search space set s for consecutive time slots, and without listening to the next k s -Ts The PDCCH of the search space set s of consecutive time slots. Figure 1A and Figure 1B It shows that there is T s = 1 time slot and k s = Example of PDCCH monitoring with 2 time slots.

[0042] This invention discloses an exemplary power-saving technique that combines skipping PDCCH monitoring behavior and PDCCH periodic monitoring behavior by switching PDCCH monitoring parameters. Simulation results show that the exemplary power-saving technique can reduce UE power consumption compared to the PDCCH monitoring method in NR Rel-15.

[0043] The example headings in the following sections are intended to facilitate understanding of the disclosed subject matter and do not in any way limit the scope of the claimed subject matter. Therefore, one or more features of one example section may be combined with one or more features of another example section. Furthermore, the term "5G" is used for clarity, but the technologies disclosed in this document are not limited to 5G technology and can be used in wireless systems implementing other protocols.

[0044] introduce

[0045] In existing Long Term Evolution (LTE) and 5G NR communication systems, downlink L1 / L2 control information includes downlink scheduling allocation information and uplink scheduling authorization information, such as time and frequency resources, time slot formats, modulation and coding modes, and the uplink transmission format of the information to be received by the UE. In 5G NR, there are eight DCI formats, including DCI formats 0_0 / 1_0 / 0_1 / 1_1 / 2_0 / 2_1 / 2_2 / 2_3. DCI format 0_0 / 1_0 is a backoff format, supporting higher reliability and fewer bearer information bits; DCI format 0_1 / 1_1 is a non-backoff format, carrying more information bits and supporting all NR feature indications; DCI format 2_0 indicates the UE's Slot Format Information (SFI); DCI format 2_1 is used to notify one or more PRBs and one or more OFDM symbols, where the UE can assume the transmission is not directed to that UE; DCI format 2_2 sends TPC commands for PUCCH and PUSCH; DCI format 2_3 sends a group of TPC commands for SRS transmission via one or more UEs, along with an SRS request along with the TPC commands. Specifically, the base station or gNodeB (gNB) sends downlink scheduling information to the UE via PDCCH, and the UE detects and listens for all available PDCCH candidates at the PDCCH timing determined by the RRC signaling / MAC CE according to the search space set configured by the network. In NR, the UE does not need to perform PDCCH listening across the entire bandwidth, but the number of PDCCH candidates the UE needs to listen for is still large. In certain intermittent service modes, the time interval between two consecutive data arrivals is too long, causing the UE to perform a large number of unnecessary PDCCH listening operations, resulting in a large amount of power consumption.

[0046] This invention describes a technique for saving power for UEs to perform PDCCH listening. As described in the NR Release-15 specification and... Figure 1A and Figure 1B As shown, the UE performs PDCCH listening at PDCCH listening opportunities during the DRX active time in each DRX cycle with discontinuous reception (DRX) configuration; and the UE listens for PDCCH at PDCCH listening opportunities without DRX configuration. For the search space set s, one or more PDCCH listening opportunities are determined by... Calculation, where the UE is from the time slot Start by listening to T s A PDCCH with consecutive time slots, and without listening to the next k slots. s -T s A continuous time-slot PDCCH. T s yes Figure 1A and Figure 1BThe PDCCH listening timing shown in the figure is T for each PDCCH listening period. s Each time slot.

[0047] Currently, only the power-saving mode of DRX is supported in NR; however, performing too many unnecessary PDCCH listening operations wastes UE power. This invention proposes an exemplary PDCCH listening mode, in which the UE selects an appropriate PDCCH listening mode or parameter set based on some predefined information. This exemplary listening mode not only reduces unnecessary PDCCH listening power consumption but also avoids lost PDCCH reception and effectively reduces latency. Therefore, the exemplary technology described in this invention provides technical advantages in reducing unnecessary PDCCH listening operations and reducing UE PDCCH listening power consumption.

[0048] Examples of PDCCH monitoring techniques include combining skipping PDCCH monitoring with periodic PDCCH monitoring. The UE can adjust its PDCCH monitoring behavior based on L1 / L2 / L3 signaling instructions from the base station or network, or trigger it automatically, to reduce unnecessary PDCCH monitoring. By adopting exemplary PDCCH monitoring schemes, the UE can effectively reduce unnecessary PDCCH monitoring operations and achieve power savings.

[0049] I. Example 1: The UE determines the PDCCH monitoring mode based on the control information.

[0050] Figure 2 An exemplary power-saving technique for PDCCH eavesdropping is illustrated. At operation 202, the gNB sends RRC signaling / MAC CE / L1 signaling to the UE. At operation 204, the UE receives signaling including predefined information. At operation 206, the UE selects a PDCCH eavesdropping method based on the predefined information. Therefore, the UE eavesdrops on the PDCCH using the current PDCCH eavesdropping mode. When the UE's control information is of a specific type (e.g., Radio Network Temporary Identifier (RNTI)) or differs from the current information, the UE can determine the appropriate PDCCH eavesdropping mode based on the predefined information received. For example, if the predefined information is an RNTI, the UE can only eavesdrop on PDCCHs with a higher PDCCH frequency when it receives a C-RNTI, MCS-C_RNTI, or CS-RNTI, where C-RNTI, MCS-C_RNTI, or CS-RNTI are specific types of control information. As further explained in methods 1 to 4 of embodiment 1 below, the UE can skip PDCCH monitoring, switch PDCCH periodic monitoring parameters, or perform other operations based on the predefined information received by the UE from the gNB.

[0051] Method 1: Predefined information in DCI format

[0052] Before listening to the PDCCH, the UE knows whether the next PDCCH carries DCI format 0_0 / 1_0 or DCI format 2_0 / 2_1 / 2_2 / 2_3, or the previously listened-to PDCCH carries DCI format 0_0 / 1_0 or DCI format 2_0 / 2_1 / 2_2 / 2_3. If the UE's current PDCCH listening frequency (T...) s_curr / K s_curr If the PDCCH monitoring frequency is greater than the threshold A (threshold A ≤ M1), the UE can switch to another PDCCH monitoring mode. This mode achieves a higher PDCCH monitoring frequency by shortening the PDCCH monitoring period or increasing the PDCCH monitoring duration. Shortening the PDCCH monitoring period implies another PDCCH monitoring period (K). s_another The UE's listening period (K) is less than the period configured by L1 / L2 / L3 signaling. s ) or the current PDCCH listening period (K s_curr Multiply by 2 n1 , n1<0; and the increased PDCCH listening duration implies another PDCCH listening duration (T s_anther The duration of the listening session (T) provided to the UE by L1 / L2 / L3 signaling is greater than the duration of the listening session (T). s ) or the current PDCCH listening duration (T) s_curr Multiply by 2 n2 If n2 > 0, then n1 and n2 are equal to 0, where 1 / 4 <M1≤1。

[0053] When the DCI format of the PDCCH carried by the gNB to the UE is DCI format 0_1 / 1_1 and the UE's current PDCCH listening frequency (T) s_curr / K s_curr When the PDCCH monitoring frequency is greater than the threshold B (threshold B ≥ M2), the UE can switch to another PDCCH monitoring mode. This mode achieves a lower PDCCH monitoring frequency by increasing the PDCCH monitoring period or shortening the PDCCH monitoring duration. Increasing the PDCCH monitoring period means that another PDCCH monitoring period (K) is required. s_another The UE's listening period (K) configured by L1 / L2 / L3 signaling is greater than the UE's listening period (K). s ) or the current PDCCH listening period (K s_curr Multiply by 2 n1 n1>0; and shortening the PDCCH listening duration implies another PDCCH listening duration (T s_anther The duration of the listening session (T) provided to the UE by L1 / L2 / L3 signaling is less than the duration of the listening session (T). s) or the current PDCCH monitoring duration (T s_curr ) multiplied by 2 n2 , n2 < 0. Otherwise, n1 and n2 are equal to 0, where 0 < M2 ≤ 3 / 4 and M1 ≤ M2.

[0054] In this monitoring mode, since DCI format 0_0 / 1_0 is a fallback DCI format, the transmission reliability can be very high. Therefore, PDCCH monitoring should be performed more frequently within a period of time to prevent missed detection. DCI format 0_1 / 1_1 requires better channel conditions to carry a larger payload size, making the reliability requirement for DCI format 0_1 / 1_1 relatively less strict. For DCI format 0_1 / 1_1, the monitoring period of the PDCCH can be appropriately relaxed so that the PDCCH monitoring is performed less frequently within a period of time.

[0055] Method 2: The predefined information is the search space type information

[0056] In the case where the UE monitors the PDCCH in the common search space, if the current PDCCH monitoring frequency (T s_curr / K s_curr ) of the current UE is greater than the threshold A (threshold A ≤ M1), the UE can switch to another PDCCH monitoring mode that achieves a higher PDCCH monitoring frequency. Otherwise, the current PDCCH monitoring mode is maintained. In the case where the PDCCH is monitored in the UE-specific search space for the UE, if the current PDCCH monitoring frequency (T s_curr / K s_curr ) of the UE is greater than the threshold B (threshold B ≥ M2), the UE can switch to another PDCCH monitoring mode that achieves a smaller PDCCH monitoring frequency.

[0057] This method takes into account that for the common search space, the UE has a relatively high reliability requirement for receiving DCI format 0_0 / 1_0, DCI format 2_0, DCI format 2_1, DCI format 2_2, DCI format 2_3. And therefore, in order to prevent missing DCI reception, PDCCH monitoring should be performed more frequently within a period of time. On the contrary, for the UE-specific search space, the system has a relatively low reliability requirement for the reception of DCI format 0_0 / 1_0 and DCI format 0_1 / 1_1. Therefore, the PDCCH monitoring period can be appropriately relaxed so that the timing of monitoring the PDCCH is performed less frequently within a period of time.

[0058] Method 3: The predefined information is the RNTI type information

[0059] When the UE determines or detects that the DCI carried by the PDCCH contains cyclic redundancy check (CRC) scrambled by P-RNTI, SI-RNTI, or RA-RNTI (excluding C-RNTI, MCS-C-RNTI, or CS-RNTI), the UE can switch to another PDCCH monitoring mode that implements a higher PDCCH monitoring frequency; otherwise, it maintains the current PDCCH monitoring mode. This applies when the CRC of the DCI carried by the PDCCH is scrambled by C-RNTI, MCS-C-RNTI, or CS-RNTI, and the UE's current PDCCH monitoring frequency (T...) is... s_curr / K s_curr If the value is greater than the threshold B (threshold B ≥ M2), the UE can switch to another PDCCH listening mode that implements a smaller PDCCH listening frequency.

[0060] Method 4: Predefined information is the indication information carried by the wake-up signal (WUS).

[0061] When the UE detects WUS at the WUS detection time and knows that subsequent data will arrive according to the gNB's WUS indication, the UE can adopt a more frequent PDCCH listening mode for a period of time, and switch back to the original PDCCH listening mode after detecting PDCCH if no other relevant configuration is received. If the UE does not detect WUS at the WUS detection time, the UE can determine that no data can arrive in subsequent time slots until the next WUS detection time or the next DRX On duration, and the UE can skip PDCCH listening until the end of the next WUS detection time or the DRX On duration.

[0062] Methods 3 and 4 in this embodiment can achieve greater power saving gains by reducing unnecessary PDCCH listening.

[0063] Method 5: Predefined information is power saving DCI (PS-DCI) or PS-RNTI.

[0064] If the UE detects a PDCCH carrying a PS-DCI, the UE can use the PS-DCI carried by the PDCCH to indicate whether to switch PDCCH listening periods or skip PDCCH listening. For example, the UE listens to the PDCCH at a PDCCH listening frequency Ks / Ts = 1. The PS-DCI is sent to indicate the PDCCH listening period to the UE, for example, 1 / 8. The UE can then increase its PDCCH listening period Ks by multiplying by 8 or decrease the duration Ts of the PDCCH listening within the period by multiplying by 1 / 8.

[0065] If the UE decodes a PDCCH carrying a DCI with a CRC scrambled by PS-RNTI, the UE can also adjust the PDCCH listening period indicated by PS-RNTI. The specific PDCCH listening mode should be indicated by DCI, MAC CE, or RRC signaling.

[0066] II. Example 2: The UE determines the PDCCH listening mode based on resource-related information.

[0067] Figure 2 An exemplary power-saving technique for PDCCH eavesdropping is illustrated. At operation 202, the gNB sends RRC signaling / MAC CE / L1 signaling to the UE. At operation 204, the UE receives signaling including predefined information. At operation 206, the UE selects a PDCCH eavesdropping method based on the predefined information.

[0068] Figure 3 The flowchart illustrates the process of the base station sending a DCI to the UE. At operation 302, the gNB sends a DCI to the UE. At operation 304, the UE listens to the PDCCH using the PDCCH listening method.

[0069] Figure 4 The flowchart illustrates the process by which the UE determines its PDCCH listening method or mode. At step 402, the UE determines the PDCCH listening method based on or according to predefined information sent by the gNB and received by the UE. At step 404, the UE listens for the PDCCH at the determined PDCCH timing based on the determined PDCCH listening method.

[0070] Figure 5 An exemplary sequence diagram of the base station instructing the UE on the PDCCH monitoring method based on the report information received from the UE. According to Figure 5 As shown in the method, the UE reports the supported PDCCH listening methods to the gNB; the gNB sends control information to the UE and indicates the PDCCH listening methods.

[0071] The UE listens to the PDCCH in the current PDCCH listening mode. When the resources configured by the base station change to those of the UE or the UE automatically switches resource information, the UE determines the appropriate PDCCH listening mode based on predefined information. For example, as further explained in modes 1 to 9 of Example 2 below, based on the predefined information received by the UE from the gNB, the UE can skip PDCCH listening, switch PDCCH period parameters, or perform other operations.

[0072] Mode 1: Predefined information is time-domain indication information

[0073] When the interval between the current PDCCH and the PDCCH carrying the DCI scheduling data is k0 time slots or N symbols, the UE can skip the PDCCH monitoring for this time length (such as k0 time slots or N symbols), or switch the PDCCH monitoring period parameter to avoid monitoring the PDCCH within the time interval. In this mode, the monitoring power consumption of the UE can be reduced by reducing unnecessary PDCCH monitoring.

[0074] Mode 2: The predefined information is frequency-domain resource indication information

[0075] The PDSCH frequency-domain resource is indicated by DCI. When the UE determines that the scheduled frequency-domain resource of the arriving PDSCH that the UE is to receive is greater than the threshold F indicated by DCI, such as n PRB > f1 (f1 > 100), the UE believes that: the data has more transmission information bits or the modulation and coding scheme (MCS) level corresponds to a lower transmission code rate, and thus requires more processing time. In this case, the UE can switch to another PDCCH monitoring mode that achieves a higher PDCCH monitoring frequency to ensure that the PDCCH monitoring opportunity does not overlap with the PDSCH reception. On the other hand, if the UE determines that the scheduled frequency-domain resource of the PDSCH that the UE is to receive is less than the threshold F indicated by DCI, such as nPRB < f2 (f2 < 200), then the UE can believe that: the data transmission information bits are few, or the MCS level corresponds to a higher transmission code rate, and thus requires less processing time. In this case, the UE can adopt a PDCCH monitoring mode that achieves a smaller PDCCH monitoring frequency to avoid missing the next downlink data scheduling PDCCH.

[0076] Mode 3: The predefined information is bandwidth part (BWP) ID information

[0077] When the UE is configured to switch to a new BWP, the UE can skip PDCCH monitoring during the BWP switching time or handover period, or change the PDCCH monitoring period parameter to avoid monitoring the PDCCH at the BWP switching time.

[0078] In addition, if the UE switches from a smaller BWP to a larger BWP, the UE can switch to another PDCCH monitoring mode that achieves a smaller PDCCH monitoring frequency; if the UE switches from a larger BWP to a smaller BWP, the UE can switch to another PDCCH monitoring mode that achieves a higher PDCCH monitoring frequency. The smaller BWP indicates the default BWP, the initial BWP, the BWP with BW ≤ 20 MHz, or the low-power BWP, etc.

[0079] Mode 4: The predefined information is CORESET information

[0080] When the UE performs PDCCH monitoring in multiple CORESETs, such as when the number of CORESETs is greater than the threshold R, the UE can switch to another PDCCH monitoring mode that achieves a higher PDCCH monitoring frequency; otherwise, when the UE only monitors one CORESET PDCCH, the UE can switch to another PDCCH monitoring mode that achieves a lower PDCCH monitoring frequency.

[0081] In addition, when the control resource set of the PDCCH common search space that the UE needs to monitor is CORESET 0, the UE can switch to another PDCCH monitoring mode that achieves a higher PDCCH monitoring frequency; when the control resource set index allocated to the UE is not 0, the UE can switch to another PDCCH monitoring mode that achieves a lower PDCCH monitoring frequency.

[0082] Mode 5: The predefined information is carrier ID information

[0083] When the UE is scheduled across carriers, the UE can perform PDCCH monitoring in two different carriers with different SCSs. Here, the UE can adopt a PDCCH monitoring mode that achieves a lower PDCCH monitoring frequency on the carrier with a larger SCS, or adopt a PDCCH monitoring mode that achieves a higher PDCCH monitoring frequency on the carrier with a smaller SCS.

[0084] Mode 6: The predefined information is subcarrier spacing information

[0085] When the subcarrier spacing of the UE is greater than the threshold S1, such as SCS > S1 (S1 > 60 KHz), the number of time slots in each frame is more. In this case, the UE should switch to another PDCCH monitoring mode that achieves a higher PDCCH monitoring frequency than the current PDCCH monitoring frequency. When the subcarrier spacing of the UE is less than the threshold S2, such as SCS < S2 (S2 < 120 KHz), the number of time slots in each frame is larger. In this case, the UE can switch to another PDCCH monitoring mode that achieves a lower PDCCH monitoring frequency than the current PDCCH monitoring frequency.

[0086] Mode 7: The predefined information is carrier aggregation level (AL) information

[0087] When the aggregation level of the search space where the UE monitors the PDCCH is higher than the threshold L1, such as AL > L1 (L1 > 8), the UE can adopt a PDCCH monitoring mode that achieves a higher PDCCH monitoring frequency than the current PDCCH monitoring frequency; otherwise, if the aggregation level of the search space where the UE monitors the PDCCH is lower than the threshold L2, such as AL < L2 (L2 < 16), then the UE can adopt a PDCCH monitoring mode that achieves a lower PDCCH monitoring frequency than the current PDCCH monitoring frequency.

[0088] Mode 8: Predefined information is Frequency Range Type (FR Type) information.

[0089] When a UE is configured with both FR1 and FR2, for the serving cell group of FR1, the UE can adopt a PDCCH monitoring mode that implements a PDCCH monitoring frequency higher than the current PDCCH monitoring frequency; for the serving cell of FR2, the UE can adopt a PDCCH monitoring mode that implements a PDCCH monitoring frequency lower than the current PDCCH monitoring frequency.

[0090] Given that FR1 supports fewer frequencies than FR2, the maximum SCS supported by FR1 is less than that supported by FR2. Therefore, if a UE is configured with both FR types simultaneously, for FR1, the UE can use sparse periodic PDCCH listening, while for FR2, the UE can use denser periodic PDCCH listening.

[0091] Mode 9: Predefined information is Rank Indicator (RI) information

[0092] The UE obtains the current channel RI value by detecting the channel state and reports the RI to the base station. When the RI value is greater than the threshold R1, such as RI>R1 (R1<3), the UE can adopt a PDCCH monitoring mode that implements a higher PDCCH monitoring frequency than the current PDCCH monitoring mode. When the RI value is 0 or less than R2, such as RI...<R2(R2> 0), the UE can adopt a PDCCH monitoring mode that implements a smaller PDCCH monitoring frequency than the current PDCCH monitoring mode.

[0093] Similarly, defining predefined information as a precoded matrix indicator (PMI) also applies to the relationship between RI and PMI and antenna port number.

[0094] III. Example 3: The UE determines the PDCCH monitoring mode based on the service type information.

[0095] The UE listens to the PDCCH in the current PDCCH listening mode. When the base station detects a change in the UE's QoS status or when the UE reports its current application or service requirements to the base station via auxiliary information, the UE determines the appropriate PDCCH listening mode based on predefined information sent by the base station. Examples include skipping PDCCH listening or switching PDCCH period parameters.

[0096] When the 5QI value obtained by the gNB is one of set1, where set1 is at least one of the values ​​in [1,2,3,4,5,6,7,65,66,67,69,70,79,80], the gNB can configure the UE to implement a PDCCH listening mode with a lower PDCCH listening frequency, or instruct the UE to skip the PDCCH listening duration according to the current UE's buffer state. When the 5QI value is not in set1, the gNB can configure an appropriate PDCCH listening mode for the UE according to the current UE's buffer state.

[0097] IV. Example 4: The UE determines the PDCCH listening mode based on the power saving strategy or power saving parameters.

[0098] The UE listens to the PDCCH in the current PDCCH listening mode. When the UE can use power... Consumption When implementing a power saving strategy, the UE can adjust the power consumption based on the available power. Consumption The appropriate PDCCH listening mode is determined by saving strategies or parameters, such as skipping PDCCH listening or switching PDCCH period parameters.

[0099] Mode 1: When configuring DRX, the UE can adopt a PDCCH listening mode with a higher PDCCH listening frequency at the beginning of the DRX On duration. After successful PDCCH decoding or after the DRX inactivity timer starts counting N time slots, the UE can adopt a PDCCH listening mode with a lower PDCCH listening frequency.

[0100] Mode 2: When the UE switches from a long DRX period to a short DRX period, the UE can adopt a PDCCH monitoring mode that implements a higher PDCCH monitoring frequency to reduce latency. Conversely, the UE can adopt a PDCCH monitoring mode that implements a smaller PDCCH monitoring frequency and a sparse period to reduce unnecessary PDCCH monitoring. The PDCCH monitoring period, PDCCH monitoring duration, and the start position of the PDCCH monitoring period are all related to the configuration of the DRX period, DRX On duration, and DRX Inactivity timer.

[0101] Mode 3: In the case of non-DRX configuration, the UE can determine the PDCCH listening mode by counting the number of PDCCHs listened to over a period of time.

[0102] V. Example 5: UE determines PDCCH monitoring mode based on reference signal

[0103] The UE listens to the PDCCH in the current PDCCH listening mode. When the UE receives or transmits one or more reference signals, the UE determines the appropriate PDCCH listening mode based on predefined information, such as skipping PDCCH listening or switching PDCCH period parameters.

[0104] Mode 1: When the UE is configured with CSI-Mask, the UE may not report CSI, and PDCCH monitoring is unnecessary during this period. Therefore, CSI-Mask can be used to determine the UE's skip PDCCH monitoring mode.

[0105] Mode 2: After successfully decoding the PDCCH for the UE, the UE needs to receive CSI-RS according to the DCI instruction and report the CSI to the gNB to receive the PDSCH. If no data is scheduled during the CSI-RS, the UE can adopt the skip PDCCH listening mode. Until the CSI report is completed or downlink data arrives (e.g., the PDSCH time is scheduled), the UE can switch to the configured or most recent PDCCH period listening mode.

[0106] Mode 3: The UE determines the PDCCH listening mode based on the demodulation reference signal (DMRS). The gNB uses DMRS such as the port type or number to implicitly indicate the UE's PDCCH listening mode and listening parameters. For example, when the UE receives a type 1 DMRS, the UE can adopt a skip PDCCH listening mode; when the UE receives a type 2 DMRS, the UE can use periodic PDCCH listening.

[0107] Mode 4: The UE determines the PDCCH listening mode based on the HARQ-ACK. The 1-bit information of the HARQ-ACK is sent periodically, and the specific period is a part of the {2,4,5,8,10,16,20,40,80,160,320,640,1280,2560} time slots. When the UE detects a HARQ-ACK with an 'ACK' indication, the UE can choose the PDCCH periodic listening mode; when the UE detects a HARQ-ACK with a 'NACK' indication, the UE can choose to skip the PDCCH listening mode until the next HARQ-ACK detection opportunity.

[0108] In this mode, a 1-bit HARQ-ACK is used to indicate the PDCCH listening mode, which has low power consumption and high reliability.

[0109] Mode 5: The UE determines the PDCCH detection mode based on the Synchronization Reference Signal (TRS). The TRS can implicitly instruct the UE to select the PDCCH listening mode based on factors such as the number of ports of the TRS or the initial value of the TRS sequence.

[0110] Mode 6: The UE determines the PDCCH listening mode based on the Sounding Reference Signal (SRS). The UE also determines the PDCCH listening mode based on the 2-bit indication of the SRS request field or the sequence initial value of the SRS.

[0111] The above mode mainly uses information carried by the reference signal to instruct the UE to select the PDCCH monitoring mode, which can effectively reduce unnecessary PDCCH monitoring.

[0112] VI. Example 6: The UE determines the PDCCH listening mode based on L1 / L2 / L3 signaling.

[0113] Mode 1: The UE dynamically switches or determines the PDCCH listening mode based on L1 signaling. For example, the UE determines the PDCCH listening mode based on the corresponding field in the DCI. In this way, indication latency can be reduced, and the DCI information carried by the PDCCH can guarantee high reliability and low latency.

[0114] Mode 2: The UE switches or determines the PDCCH listening mode based on L2 signaling, for example, the UE switches the PDCCH listening mode based on the MAC CE. In this mode, the UE can be configured to switch the PDCCH listening mode via DRX Command MAC CE and Long DRX Command MAC CE. These DRX Command MAC CE and Long DRX Command MAC CE trigger the UE to execute a skip PDCCH listening mode with a start position and a skip PDCCH listening duration. Alternatively, in the absence of HARQ, CSI, SRS, etc., a new RA Command MAC CE prematurely terminates the running ra-ResponseWindow or ra-ContentionResolutionTimer to trigger the UE to skip PDCCH listening. Incidentally, the skip PDCCH listening duration can also be indicated by L3 signaling or L1 signaling.

[0115] Mode 3: The UE instructs PDCCH monitoring behavior based on L3 signaling. For example, the UE determines the PDCCH monitoring mode based on the PDCCH-Config field in the RRC signaling SearchSpace IE. The PDCCH monitoring duration can be extended to (0~2559) time slots by supporting a complementary value of 0 (the default duration is 0 when no duration exists). That is, when the PDCCH monitoring duration does not exist, the UE stops PDCCH monitoring, i.e., skips the PDCCH monitoring mode. If the UE adopts the skip PDCCH monitoring mode, the skipped PDCCH duration is n*Ks time slots, where n is the number of continuous PDCCH cycles. The skipped PDCCH duration can also be indicated by the SearchSpace IE, where the parameter is a*2. n , where a is a prime number greater than 0, and n is a non-negative integer, and the range of this value is 0≤n≤10.

[0116] In addition, the PDCCH listening parameters in the PDCCH-Config field of the RRC signaling SearchSpace IE can include two parts: one part is used for the PDCCH periodic listening mode (including Ks, Os, Ts, and listening symbol), and the other part is used for the skip PDCCH listening mode (including the start position and skip duration).

[0117] Mode 4: The UE can dynamically select the PDCCH listening mode via RRC signaling / MAC CE / L1 signaling. Figure 8 An exemplary technique for configuring a PDCCH listening method is illustrated. First, PDCCH listening parameter Set1 (which consists of a skip PDCCH listening mode parameter set, including the start skip position and skip duration or PDCCH periodic listening parameters) is selected from the PDCCH listening parameter table according to the UE's capabilities and configured semi-persistently for the UE via RRC signaling. Second, PDCCH listening parameter Set2, suitable for the current MAC entity, is selected from PDCCH listening parameter Set1 and configured for the UE by the MAC CE. Finally, PDCCH listening parameters are selected from PDCCH listening parameter Set2 and dynamically configured by L1 signaling, such as DCI.

[0118] Additionally, the UE can switch or select the PDCCH monitoring mode based on the predefined information in Chapters VII-XI through the configuration of RRC signaling / MAC CE. The configuration of RRC signaling / MAC CE can be a set of PDCCH monitoring parameters (Ks, Ts, Os, skip duration, skip start position, etc.), or a PDCCH monitoring period or frequency (e.g., Ts / Ks), or a PDCCH monitoring mode indicator.

[0119] In addition, the UE can perform handover or select PDCCH monitoring mode based on predefined information in sections VII to XI triggered by PS-DCI or PS signals sent from the gNB.

[0120] Sections VII and XI describe exemplary PDCCH listening modes. The UE can select one of the PDCCH listening modes in each section based on the predefined information above.

[0121] VII. Example 7: Skipping PDCCH monitoring mode and switching PDCCH periodic monitoring mode do not occur simultaneously.

[0122] Mode 1: The UE selects a mode from the listening modes (i.e., skip PDCCH listening mode and non-skip PDCCH listening mode) based on predefined information.

[0123] Assume that in this scheme, skipping the PDCCH listening mode has a higher priority than switching the PDCCH periodic listening mode.

[0124] The UE configures PDCCH monitoring using the (Ts,Ks,Os) parameters. Upon detecting a PDCCH, the UE can switch to a skip PDCCH monitoring mode based on DCI instructions. This skip PDCCH monitoring mode includes a start skip position and a skip PDCCH monitoring duration. During the skip PDCCH monitoring operation, the UE does not perform any PDCCH monitoring operations during the skip duration or the skip-PDCCH timer count. When the skip-PDCCH timer expires or the skip duration ends, if no new PDCCH periodic monitoring mode is configured, the UE can perform PDCCH monitoring operations using the most recent (Ts,Ks,Os) parameter configuration. Alternatively, the UE can perform PDCCH monitoring operations configured by RRC signaling or MAC CE.

[0125] For example, such as Figure 6 As shown, the UE listens for PDCCH on a BWP with SCS = 30kHz. At the beginning of the DRX On duration, the UE performs PDCCH listening with parameters (absent, 2, 0), i.e., Ts = slot 1, Ks = slot 2, Os = 0. The UE starts PDCCH listening with even-indexed slots every two slot periods. After listening to PDCCH, the UE performs skip-PDCCH listening with 6 slots indicated by the DCI. When the skip-PDCCH timer expires or the skip duration ends, the UE continues to perform PDCCH listening with parameters (absent, 2, 0) if there is no new configuration. Upon receiving a new configuration (3, 10, 5), the UE performs PDCCH listening with the new parameter configuration until the inactivity timer expires.

[0126] For example, such as Figure 7 As shown, it is assumed that UEs without DRX configuration have the same configuration process.

[0127] Mode 2: The UE selects a mode from the adjusted PDCCH listening frequency mode and the unadjusted PDCCH listening frequency mode based on predefined information.

[0128] For the adjusted PDCCH listening frequency mode, the UE adjusts the PDCCH listening frequency according to the predefined information in Examples 1-6. For the non-adjusted PDCCH listening frequency mode, the UE cannot adjust the PDCCH listening period, such as skipping the PDCCH listening operation or maintaining the current PDCCH period listening mode.

[0129] For example, the UE's PDCCH listening frequency can be adjusted from 3 / 4 as indicated by higher-layer parameters to 1 / 4, or, based on predefined information, the UE can reduce the PDCCH listening frequency indicated by L1 signaling or increase the PDCCH listening period. If other higher-priority operations exist, the UE may stop or not want to adjust the PDCCH listening frequency.

[0130] VIII. Example 8: Combining skipping PDCCH monitoring with switching PDCCH cycles

[0131] Method 1: The UE selects an adjusted PDCCH listening frequency mode with one parameter set from among the adjusted PDCCH listening frequency modes with multiple candidate parameter sets based on predefined information.

[0132] For example, among multiple candidate parameter sets, a portion of the parameter set is used to implement skipping PDCCH listening, while the remainder is used to implement PDCCH periodic listening mode.

[0133] The UE performs PDCCH listening using the (Ts, Ks, Os) parameter set in the corresponding PDCCH timing. If the UE supports adjusting the PDCCH listening period, it reports this to the gNB. Through RRC signaling / MAC CE / L1 signaling, based on the UE's current data buffer state, the gNB can instruct the UE that the parameter set (Ts1, Ks1, Os1) can achieve skipping PDCCH listening operations for a period of time.

[0134] When the PDCCH listening duration Tsl is 0 or all 14 information bits of the monitoringSymbolsWithinSlot field in the SearchSpace IE are zero, the UE can directly skip PDCCH listening for a duration of (n*Ks) slots. When Tsl is greater than 0 and not all 14 information bits of the monitoringSymbolsWithinSlot field in the SearchSpace IE are zero, the UE can only skip PDCCH listening for a duration no greater than Ks. Furthermore, the end position of skipped PDCCH listening supported by the parameter set should be indicated by the skip duration or the number of consecutive PDCCH listening cycles, or triggered by a new PDCCH cycle listening configuration. The number of consecutive PDCCH listening cycles or the skip duration can be indicated by RRC signaling.

[0135] During the skip-PDCCH listening period, the UE may not perform any PDCCH listening operations and may use the skip-PDCCH timer for timing. After the skip-PDCCH timer expires, the UE may perform PDCCH listening operations using the new (Ts',Ks',Os') parameter configuration configured by the base station or using the most recent (Ts,Ks,Os) parameter configuration combination.

[0136] For example, such as Figure 9 As shown, the subcarrier spacing of the frequency band occupied by the UE is 30kHz. At the beginning of the DRX On duration, the UE takes the parameter (absent, 2, 0), i.e., Ts = slot 1, Ks = slot 2, Os = 0. In the configuration, the UE starts from the even-indexed slot and performs PDCCH listening on the first slot of the two-slot period. After listening to the PDCCH, the UE performs a skip 6 slots operation according to the advanced configuration parameter (3, 10, 5). After the operation is completed, the UE does not configure a new parameter combination, and the PDCCH still uses (3, 10, 5). Listening and expiring until the inactivity timer expires. Until the inactivity timer expires. During this process, if the PDCCH indicates an operation such as BWP handover, the PDCCH listening operation can be performed after switching to the new BWP and after PDSCH reception is completed.

[0137] For example, such as Figure 10 As shown, the subcarrier spacing of the frequency band occupied by the UE is 30kHz. At the beginning of frame 0, the UE uses the parameters (absent, 2, 0), i.e., Ts = slot 1, Ks = slot 2, and Os = 0. In the configuration, the UE starts from the even-indexed slot and performs PDCCH listening in the first slot of the two-slot period. After listening to the PDCCH, the UE performs a skip 26 slots operation according to the higher-layer parameters (0, 20, 0). After the operation is completed, the UE is configured with a new parameter set, and the UE can listen to the PDCCH using the new parameters (3, 10, 5) configured by the higher-layer parameters.

[0138] Method 2: The UE selects an adjustable PDCCH listening mode with one parameter set from among the adjustable PDCCH listening modes with multiple candidate parameter sets based on predefined information.

[0139] The multiple candidate parameter sets for adjusting the PDCCH monitoring mode can be configured using two different parameter sets to support either the skip PDCCH monitoring mode or the PDCCH periodic monitoring mode. One parameter set includes the start position of skipping PDCCH monitoring, and / or the skip duration, and / or the skip timer, and / or the end position of skipping PDCCH monitoring. The other parameter set includes the current parameters in the PDCCH-Config field of the SearchSpace IE. Additionally, the UE should add both PDCCH monitoring modes to its feature list to effectively notify the gNB of the supported PDCCH monitoring modes via auxiliary information.

[0140] Method 3: The UE selects a skip PDCCH listening mode from multiple candidate parameter sets based on predefined information.

[0141] In this method, for UEs that do not support the PDCCH listening periodic mode, the UE can directly listen to the PDCCH by using a skip PDCCH listening mode with parameters configured by the gNB, thereby saving power. The parameter set includes the start position of skipping PDCCH listening, and / or the skip duration, and / or the skip timer, and / or the end position of skipping PDCCH listening. The UE can also be instructed to skip PDCCH listening via a periodic signal.

[0142] When the UE does not perform skip PDCCH listening, the UE without the ability to periodically listen to PDCCH can start continuously listening to PDCCH in each time slot or listen to PDCCH through the default PDCCH listening behavior.

[0143] For example, such as Figure 11 As shown, the UE's subcarrier spacing is assumed to be 30kHz, and the total number of time slots in a frame is 20. The UE performs continuous PDCCH listening at the beginning of the DRX On duration. After the first PDCCH listening, it skips PDCCH listening for 6 time slots according to the downlink control information. After the operation ends, the UE begins to fall back to the continuous PDCCH listening state, and if no PDCCH is detected for N consecutive time slots, the UE is configured to skip PDCCH listening for a duration, or the UE automatically performs the skip PDCCH operation until the DRX Inactivity timer expires.

[0144] When DRX is not configured, the UE always performs continuous PDCCH listening. After listening to a PDCCH, the UE performs a PDCCH listening operation that skips N time slots according to the downlink control information, and continues to perform continuous PDCCH listening at the first time slot position after the end of the listening operation. If the PDCCH has not been listened to by M consecutive PDCCHs, the skipping PDCCH listening operation is indicated by higher layer parameters or performed automatically by the UE.

[0145] For example, such as Figure 12 As illustrated, assuming the UE's subcarrier spacing is 30kHz and the total number of time slots in a frame is 20, the UE performs PDCCH listening in each time slot. If a PDCCH is detected, the UE performs a skip PDCCH listening operation according to the downlink control resource indication, and performs continuous PDCCH listening at the beginning of the first time slot after the duration ends. If no PDCCH is detected within M time slots, the skip PDCCH operation is performed automatically by higher-layer signaling or the UE within a certain duration.

[0146] Method 4: The UE selects a PDCCH listening mode from periodic PDCCH listening mode and aperiodic PDCCH listening mode.

[0147] When the UE selects the periodic PDCCH listening mode, the UE can perform PDCCH listening through the (Ts, Ks, Os) parameters at the corresponding PDCCH timing. When the UE selects the non-periodic PDCCH listening mode, the UE can perform PDCCH listening through parameters including the start position of the non-periodic PDCCH listening and the duration of the non-periodic PDCCH listening via RRC signaling / MAC CE / L1 signaling.

[0148] IX. Example 9: Skipping PDCCH Listening

[0149] The UE selects a monitoring mode that reduces the PDCCH monitoring period by one parameter set from among the monitoring modes that reduce the PDCCH monitoring period with multiple candidate parameter sets, based on predefined information.

[0150] Multiple candidate parameter sets include PDCCH listening period, PDCCH listening duration, and PDCCH listening period start position.

[0151] X. Example 10: Switching PDCCH Cycle

[0152] Mode 1: The UE selects a mode from the monitoring mode with reduced PDCCH monitoring period and the monitoring mode with reduced PDCCH monitoring period and the second type of parameter, based on predefined information.

[0153] The first type of parameter refers to the PDCCH monitoring period, the PDCCH monitoring duration, and the start position of the PDCCH monitoring period, where T>0, K>0, and P>0. The second type of parameter refers to the PDCCH monitoring period K, the PDCCH monitoring duration T, and the start position of the PDCCH monitoring period P, where T>=0, K>0, and P>0, and K is equal to α*2. n The number of time slots, where a is a prime number and n is a non-negative integer. T is not greater than K.

[0154] Mode 2: The UE selects a mode from the listening mode that reduces the PDCCH listening period and the listening mode that does not reduce the PDCCH listening period.

[0155] The parameters for both modes include the same parameters as the current parameters in the PDCCH-Config field of the SearchSpace IE. The parameter values ​​for the monitoring mode that reduces the PDCCH listening period include a PDCCH listening frequency not greater than f1, where f1 is not greater than 1 and not less than 1 / 2. The parameter values ​​for the monitoring mode that does not reduce the PDCCH listening period include a PDCCH listening frequency not less than f2, where f2 is not greater than 1 / 2 and not less than 1 / 2560. The frequency of the PDCCH listening period is calculated by dividing the PDCCH listening period by the PDCCH listening duration.

[0156] In embodiments 7 to 10 above, the UE can select a PDCCH listening mode from different PDCCH listening modes based on the predefined information described in embodiments 1 to 6. If there is any operation with a higher priority than PDCCH listening or the priority determined by the PDCCH listening mode, the UE may choose not to listen to the PDCCH.

[0157] XI. Example 11: Skipping PDCCH monitoring and switching PDCCH cycles triggered by signal indication

[0158] The PDCCH monitoring mode described in Examples 8 to 10 is triggered by a signal.

[0159] Option 1: Skipping PDCCH monitoring and switching PDCCH cycles is triggered by HARQ-ACK. When HARQ-ACK is NACK, it indicates skipping PDCCH monitoring, and when HARQ-ACK is ACK, it indicates switching PDCCH cycles. HARQ-ACK can also be used to indicate PDCCH monitoring operations for a UE group with 1 bit, and the base station groups each UE according to the CRC scrambling RNTI type or UE ID in the DCI format to be received by each UE. This option reuses HARQ-ACK, indicating a small number of bits and low power consumption for detection information.

[0160] Option 2: The above option can be indicated by the DCI used for energy saving. One bit indicates the listening behavior of a single UE, and N bits are used to indicate the listening behavior of N UEs. If the UE supports A or switches the PDCCH period to listen to the PDCCH, the DCI can indicate whether to skip the PDCCH action every 4 bits (1 bit). And when the DCI needs to indicate skipping PDCCH listening, 2 bits... n *The TA (Temporal Target) is the longest skipped PDCCH listening time (3 bits). From left to right, the last 3 bits indicate the index n, where 0 ≤ n ≤ 7. TA represents the current PDCCH listening period, which can be obtained through the configuration parameter mapping table for different DRX configuration parameters or 5QI indexes. Different skipped PDCCH listening parameter tables exist. Although this scheme requires additional overhead, using DCI to carry this information ensures optimal performance in terms of false negative and false positive rates.

[0161] Option 3: The CSI mask instructs the UE to perform PDCCH listening operations such as skipping PDCCH listening, switching PDCCH cycles, or skipping PDCCH listening and switching PDCCH cycles. This solution requires no additional overhead and is highly reliable.

[0162] Option 4: A / B / Skip PDCCH listening and switching PDCCH cycles are indicated by the slot format indication field in the DCI. This option has no additional overhead and performs better in terms of missed detection rate and false alarm rate. For example, if the base station configures the UE to perform skip PDCCH listening, the DCI can simply use a specific empty index in the slot format indication mapping table to instruct the UE to perform the PDCCH listening operation.

[0163] Option 5: Skip PDCCH monitoring operation triggered by a new low-power signal indication.

[0164] Figure 13 An exemplary flowchart for monitoring a control channel is shown. At selection operation 1302, the user equipment selects or determines a monitoring mode for the control channel based on information received by the user equipment. The monitoring mode is selected from a plurality of monitoring modes for one or more control channels. At monitoring operation 1304, the user equipment monitors the control channel according to the monitoring mode.

[0165] In the first implementation of some embodiments, the selected listening mode is one of the first listening mode that skips control channel listening and the second listening mode that does not support skipping control channel listening. In the first implementation mode, the first parameter set of the first listening mode includes: the starting position when skipping control channel listening, or the duration of skipping control channel listening, or the parameter associated with the timer, and the second parameter set of the second listening mode includes: the control channel listening period, or the starting position offset, or the listening duration in the period, or the listening symbols of the time slots in the listening duration.

[0166] In the first implementation, the starting position is not less than 0 or is a null value, and the duration of skipping control channel listening is not less than 0 or equal to 2 n and the number of time slots that is a multiple of α, where α is an integer not less than 0, and n is an integer not less than 0 and not greater than 10, the control channel listening period is the number of time slots greater than 0 time slots, the starting position offset is less than the control channel listening period, and the listening duration is the number of time slots greater than 0 and not greater than the control channel listening period, and the starting time slot index of the listening duration is associated with the control channel listening period and the starting position offset.

[0167] In the second implementation of some embodiments, the selected listening mode is one of the first listening mode that reduces the control channel listening frequency and the second listening mode that does not reduce the control channel listening frequency. In the second implementation, the first parameter set of the first listening mode includes: the first control channel listening period Ks1, or the starting position offset, or the first listening duration Ts1 in the period, or the listening symbols of the time slots in the first listening duration, and the second parameter set of the second listening mode includes: the second control channel listening period Ks2, or the starting position offset, or the second listening duration Ts2 in the period, or the listening symbols of the time slots in the second listening duration, where Ks1 > Ks2 or Ts1 < Ts2, or where the control channel listening frequency is the value obtained by dividing the first listening duration in the period by the first control channel listening period or by dividing the second listening duration in the period by the second control channel listening period.

[0168] In the second implementation, the first control channel listening period or the second control channel listening period is the number of time slots greater than 0 time slots, the starting position offset is less than the first control channel listening period or the second control channel listening period, the first listening duration is the number of time slots greater than 0 and not greater than the first control channel listening period, the second listening duration is not less than 0 and not greater than the second control channel listening period, and the starting time slot index of the first listening duration or the second listening duration is respectively associated with the first control channel listening period or the second control channel listening period, and the starting position offset.

[0169] In the second embodiment, the parameter set of the first monitoring mode includes: a correction factor δ for the control channel monitoring frequency, or a control channel monitoring period offset, or a corrected start position for the control channel monitoring frequency, or a corrected stop position for the control channel monitoring frequency, or a corrected duration for the control channel monitoring frequency, wherein the control channel monitoring frequency is a value obtained by dividing the monitoring duration in the period by the control channel monitoring period.

[0170] In the second embodiment, the correction factor δ is 2. n Where n is not greater than 0, the control channel listening period offset is greater than 0 and associated with the number of time slots δ, the starting position of the corrected control channel listening frequency is associated with the control channel listening period offset, the ending position of the corrected control channel listening frequency is associated with the control channel listening period offset, and the duration of the corrected control channel listening frequency is a number of time slots greater than 0.

[0171] In a third embodiment of some examples, the selected monitoring mode is a first monitoring mode that skips the control channel monitoring mode and a second monitoring mode that reduces the control channel monitoring frequency. In the third embodiment, the first parameter set of the first monitoring mode includes: the starting position when skipping control channel monitoring, or the duration of skipping control channel monitoring, or a parameter associated with a timer; the second parameter set of the second monitoring mode includes: the control channel monitoring period, or the starting position offset, or the monitoring duration in the period, or the monitoring symbol of the time slot in the monitoring duration; and wherein the control channel monitoring frequency is a value obtained by dividing the monitoring duration in the period by the control channel monitoring period.

[0172] In the third embodiment, the starting position is not less than 0 or is empty, and the duration of skipping control channel monitoring is not less than 0 or equal to 2 seconds. n The number of time slots that are multiples of α, where α is an integer not less than 0 and n is an integer not less than 0 and not greater than 10. The control channel listening period is the number of time slots greater than 0. The starting position offset is less than the control channel listening period. The listening duration is the number of time slots greater than 0 and not greater than the control channel listening period. The starting time slot index of the listening duration is associated with the control channel listening period and the starting position offset.

[0173] In the third embodiment, the parameter set of the second monitoring mode includes: a correction factor δ for the control channel monitoring frequency, or a control channel monitoring period offset, or a corrected start position for the control channel monitoring frequency, or a corrected stop position for the control channel monitoring frequency, or a corrected duration for the control channel monitoring frequency, wherein the control channel monitoring frequency is a value obtained by dividing the monitoring duration in the period by the control channel monitoring period.

[0174] In the third embodiment, the correction factor δ is 2 n , where n is not greater than 0, the control channel listening period offset is the number of time slots greater than 0 and associated with δ, the starting position of the corrected control channel listening frequency is associated with the control channel listening period offset, the stopping position of the corrected control channel listening frequency is associated with the control channel listening period offset, and the duration of the corrected control channel listening frequency is the number of time slots greater than 0.

[0175] In the fourth embodiment of some embodiments, the selected listening mode is one of the first listening mode that reduces the control channel listening frequency using the first type of parameter and the second listening mode that reduces the control channel listening frequency using the second type of parameter. In the fourth embodiment, the first parameter set of the first listening mode includes: the first control channel listening period Ks1, or the starting position offset, or the first listening duration Ts1 in the period, or the slot symbol in the listening duration, and the second parameter set of the second listening mode includes: the second control channel listening period Ks2, or the starting position offset, or the second listening duration Ts2 in the period, or the listening symbol of the slot in the listening duration, and wherein the control channel listening frequency is a value obtained by dividing the first listening duration in the period by the first control channel listening period or by dividing the second listening duration in the period by the second control channel listening period.

[0176] In the fourth embodiment, the first control channel listening period of the first type of parameter is different from the second control channel listening period of the second type of parameter, the first listening duration is different from the second listening duration, and the control channel listening frequency of the first listening mode is different from the control channel listening frequency of the second listening mode, and Ts1 / Ks1 > Ts2 / Ks2, or Ks1 < Ks2, or Ts1 > Ts2. In the fourth embodiment, the first control channel listening period or the second control channel listening period is the number of time slots greater than 0 time slots, the starting position offset is less than the control channel listening period, the first listening duration or the second listening duration is the number of time slots not less than 0 and not greater than the control channel listening period, and the starting slot index of the first listening duration or the second listening duration is respectively associated with the first control channel listening period or the second control channel listening period and the starting position offset.

[0177] In some embodiments, the first parameter set, the second parameter set, or the parameter set is provided by search space information in Radio Resource Control (RRC) signaling, by a Media Access Control (MAC) control element, or by Layer 1 (L1) signaling. In some embodiments, this information includes: Downlink Control Information (DCI) format information, or search space type information, or Radio Network Temporary Identifier (RNTI), or Wake-up Signal Bearer Instruction, or User Equipment Identifier. In some embodiments, this information includes: start time and length in the time domain, or number of physical resource blocks in the frequency domain, or Bandwidth Partial Index (BWPID), or Control Resource Set Index (CORESET ID), or Carrier Index (Carrier ID), Subcarrier Spacing (SCS), or Carrier Aggregation Level (AL), or Frequency Range Type (FR Type), or Rank Indicator (RI), or number of antenna ports, or Precoded Codebook Index (PMI).

[0178] In some embodiments, the information includes service type, power saving strategy, or power saving parameters of the power saving strategy. In some embodiments, the information includes: Channel State Information Reference Signal (CSI-RS), or Demodulation Reference Signal (DMRS), or Hybrid Automatic Repeat Request Acknowledgment Signal (HARQ-ACK), or Synchronization Reference Signal (TRS), or Sounding Reference Signal (SRS). In some embodiments, the information includes: Radio Resource Control (RRC) layer control signaling or Layer 3 signaling, or Intermediate Access Control (IAC) layer control information or Layer 2 signaling, or Downlink Control Information (DCI) or Layer 1 signaling. In some embodiments, the information indicates the control channel listening mode of a user equipment or a group of one or more user equipments, and the user equipment group is grouped by the base station according to one or more parameters related to the user equipment group.

[0179] In some embodiments, one or more parameters include: User Equipment Identifier (UE ID), Radio Network Temporary Identifier (RNTI), Power Saving RNTI, or Service Type Priority. In some embodiments, the control channel is the Physical Downlink Control Channel (PDCCH).

[0180] Figure 14 An exemplary block diagram of a hardware platform 1400, which may be part of a network node (e.g., a base station) or a user equipment, is shown. The hardware platform 1400 includes at least one processor 1410 and a memory 1405 storing instructions thereon. Instructions executed by the processor 1410 configure the hardware platform 1400 to perform the functions shown in Figures 1 to 1400. Figure 13And the operations described in the various embodiments described in this patent document. Transmitter 1415 transmits or sends information or data to another node. For example, a network node transmitter may send DCI to a user equipment. Receiver 1420 receives information or data transmitted or sent by another node. For example, a user equipment may receive DCI from a network node.

[0181] In this document, the use of “or” is intended to include “and / or” unless the context clearly indicates otherwise. In this document, the term “exemplary” is used to mean “an example of…” and, unless otherwise stated, does not imply an ideal or preferred embodiment.

[0182] Some embodiments described herein are described in the general context of methods or processes that may be implemented in one embodiment by a computer program product embodied in a computer-readable medium, the computer program product including computer-executable instructions, such as program code, that are executed by a computer in a networked environment. The computer-readable medium may include removable and non-removable storage devices, including but not limited to read-only memory (ROM), random access memory (RAM), optical disc (CD), digital versatile optical disc (DVD), etc. Therefore, the computer-readable medium may include non-transitory storage media. Typically, program modules may include routines, programs, objects, components, data structures, etc., that perform a particular task or implement a particular abstract data type. Computer or processor-executable instructions, associated data structures, and program modules represent examples of program code for performing steps of the methods disclosed herein. A particular sequence of such executable instructions or associated data structures represents examples of corresponding actions for implementing the functionality described in such steps or processes.

[0183] Some of the disclosed embodiments may be implemented as devices or modules using hardware circuitry, software, or a combination thereof. For example, hardware circuitry implementations may include discrete analog and / or digital components, for instance, integrated as part of a printed circuit board. Alternatively or additionally, the disclosed components or modules may be implemented as application-specific integrated circuits (ASICs) and / or field-programmable gate arrays (FPGAs) devices. Some implementations may additionally or alternatively include a digital signal processor (DSP), a special-purpose microprocessor having an architecture optimized for the operational requirements of digital signal processing associated with the disclosed functions of this application. Similarly, various components or sub-components within each module may be implemented in software, hardware, or firmware. Any connectivity method and medium known in the art may be used to provide connectivity between modules and / or components within modules, including but not limited to communication via the Internet, wired, or wireless networks using appropriate protocols.

[0184] Although this document contains numerous details, these details should not be construed as limiting the scope of the claimed invention or any claimable invention, but rather as descriptions of specific features of particular embodiments. Certain features described herein in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented separately in multiple embodiments or in any suitable sub-combination. Moreover, although features may be described above as operating in certain combinations and even initially claimed to be so, in some cases, one or more features from the claimed combination may be removed from the combination, and the claimed combination may be for sub-combinations or variations thereof. Similarly, although operations are depicted in a specific order in the drawings, this should not be construed as requiring the operations to be performed in the specific order shown or in a sequential order, or to perform all shown operations to obtain the desired result.

[0185] Only some implementation methods and examples have been described, and other implementation methods, enhancements and variations may be made based on what is described and shown in this disclosure.

Claims

1. A method of wireless communication, comprising: sending, by a user equipment, a list of features including control channel monitoring modes supported by the user equipment to a base station; in response to sending the list of features, receiving information indicating a monitoring mode of a control channel; and monitoring, by the user equipment, the control channel according to the monitoring mode selected from the control channel monitoring modes based on the information, wherein the control channel monitoring modes include a first monitoring mode and a second monitoring mode, the first monitoring mode changes control channel monitoring to a first monitoring frequency with a first type of parameter, the second monitoring mode changes the control channel monitoring to a second monitoring frequency different from the first monitoring frequency with a second type of parameter, and wherein each of the first type of parameter and the second type of parameter includes: a control channel monitoring period, and a monitoring duration in the period.

2. The method of claim 1, wherein, the control channel monitoring modes further include one of a third monitoring mode skipping control channel monitoring and a fourth monitoring mode not supporting skipping control channel monitoring. 3.The method of claim 2, wherein, a third type of parameter of the third monitoring mode includes: a duration of skipping control channel monitoring. 4.The method of claim 1, wherein for the first monitoring mode: the control channel monitoring period is Ks1, and the monitoring duration in the period is Ts1, and wherein, for the second monitoring mode: the control channel monitoring period is Ks2, the monitoring duration in the period is Ts2.

5. The method of claim 4, wherein, Ts1 / Ks1> Ts2 / Ks2, or Ks1< Ks2, or Ts1> Ts2.

6. The method of claim 1, wherein, the information includes: radio resource control (RRC) layer control signaling, or downlink control information (DCI).

7. The method of claim 1, wherein, the control channel is a physical downlink control channel (PDCCH). 8.A user equipment for wireless communication, comprising a processor configured to implement operations of: sending, by the user equipment, a list of features including control channel monitoring modes supported by the user equipment to a base station; in response to sending the list of features, receiving information indicating a monitoring mode of a control channel; monitoring, by the user equipment, the control channel according to the monitoring mode selected from the control channel monitoring modes based on the information, wherein the control channel monitoring modes include a first monitoring mode and a second monitoring mode, the first monitoring mode changes control channel monitoring to a first monitoring frequency with a first type of parameter, the second monitoring mode changes the control channel monitoring to a second monitoring frequency different from the first monitoring frequency with a second type of parameter, and wherein each of the first type of parameter and the second type of parameter includes: a control channel monitoring period, and a monitoring duration in the period.

9. The user equipment of claim 8, wherein, the control channel monitoring modes further include one of a third monitoring mode skipping control channel monitoring and a fourth monitoring mode not supporting skipping control channel monitoring. 10.The user equipment of claim 9, wherein a third type of parameter of the third monitoring mode includes: a duration of skipping control channel monitoring. 11.The user equipment of claim 8, wherein for the first monitoring mode: the control channel monitoring periodicity is Ks1, and the monitoring duration in the periodicity is Ts1, and wherein, for the second monitoring mode: the control channel monitoring periodicity is Ks2, the monitoring duration in the periodicity is Ts2.

12. The user equipment of claim 11, wherein, Ts1 / Ks1 > Ts2 / Ks2, or Ks1 < Ks2, or Ts1 > Ts2.

13. The user equipment of claim 8, wherein, the information comprises: radio resource control (RRC) layer control signaling, or downlink control information (DCI).

14. The user equipment of claim 8, wherein, the control channel is a physical downlink control channel (PDCCH). 15.A computer readable storage medium having computer readable program code stored thereon, the code, when executed by a processor, implementing the method of any one of claims 1-7.

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