Method and apparatus in wireless communication system

Abstract

A method and an apparatus in a wireless communication system are disclosed, the method including: receiving first configuration information related to a first signal for wake up, where the first configuration information includes information related to a resource for the first signal associated with a UE subgroup set index associated with more than one UE subgroup index; receiving or monitoring the first signal based on the information related to resources used for the first signal; and determine whether to monitor the paging occasion (PO) based on the information bits of the first signal and the UE subgroup index associated with the UE, where the number of UE subgroups in a UE subgroup set is associated with the number of information bits of the first signal.

Description

METHOD AND APPARATUS IN WIRELESS COMMUNICATION SYSTEM

[0001] The disclosure relates to the field of a wireless communication technology, and more specifically, to a method and an apparatus in a wireless communication system.

[0002] 5G mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in "Sub 6GHz" bands such as 3.5GHz, but also in "Above 6GHz" bands referred to as mmWave including 28GHz and 39GHz. In addition, it has been considered to implement 6G mobile communication technologies (referred to as Beyond 5G systems) in terahertz bands (for example, 95GHz to 3THz bands) in order to accomplish transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies one-tenth of 5G mobile communication technologies.

[0003] At the beginning of the development of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there has been ongoing standardization regarding beamforming and massive MIMO for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting numerologies (for example, operating multiple subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of BWP (BandWidth Part), new channel coding methods such as a LDPC (Low Density Parity Check) code for large amount of data transmission and a polar code for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing a dedicated network specialized to a specific service.

[0004] Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as V2X (Vehicle-to-everything) for aiding driving determination by autonomous vehicles based on information regarding positions and states of vehicles transmitted by the vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE Power Saving, Non-Terrestrial Network (NTN) which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning.

[0005] Moreover, there has been ongoing standardization in air interface architecture / protocol regarding technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access for simplifying random access procedure (2-step RACH for NR). There also has been ongoing standardization in system architecture / service regarding a 5G baseline architecture (for example, service based architecture or service based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE positions.

[0006] As 5G mobile communication systems are commercialized, connected devices that have been exponentially increasing will be connected to communication networks, and it is accordingly expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with eXtended Reality (XR) for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality) and the like, 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, and drone communication.

[0007] Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional space multiplexing technology using OAM (Orbital Angular Momentum), and RIS (Reconfigurable Intelligent Surface), but also full-duplex technology for increasing frequency efficiency of 6G mobile communication technologies and improving system networks, AI-based communication technology for implementing system optimization by utilizing satellites and AI (Artificial Intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for implementing services at levels of complexity exceeding the limit of UE operation capability by utilizing ultra-high-performance communication and computing resources.

[0008] According to an embodiment of the disclosure, there is provided a method performed by a user equipment (UE) in a wireless communication system, the method including: receiving first configuration information related to a first signal for wake up, where the first configuration information includes information related to resources for the first signal that are associated with a UE subgroup set index associated with more than one UE subgroup index; receiving or monitoring the first signal based on the information related to the resources for the first signal; and determining, based on information bits of the first signal and a UE subgroup index associated with the UE, whether to monitor a paging occasion (PO), where a number of UE subgroups in a UE subgroup set is associated with a number of the information bits of the first signal.

[0009] In an embodiment of the disclosure, the first configuration information further includes: information related to the number of the information bits of the first signal; or information related to the number of the UE subgroups in the UE subgroup set.

[0010] In an embodiment of the disclosure, the UE subgroup set is associated with one paging occasion, and each UE subgroup set index associated with the paging occasion and a UE subgroup index associated with each UE subgroup set index are determined based on a UE subgroup index associated with the paging occasion and the number of the UE subgroups in the UE subgroup set.

[0011] In an embodiment of the disclosure, each UE subgroup set index associated with the paging occasion and the UE subgroup index associated with each UE subgroup set index are determined by the UE subgroup index associated with the paging occasion modulo the number of the UE subgroups in the UE subgroup set, and / or each UE subgroup set index associated with the paging occasion and the UE subgroup index associated with each UE subgroup set index are determined by rounding a result of dividing the UE subgroup index associated with the paging occasion by the number of the UE subgroups in the UE subgroup set.

[0012] In an embodiment of the disclosure, receiving or monitoring the first signal based on the information related to the resources for the first signal includes: determining, based on a UE subgroup set index associated with the UE, a resource among the resources for the first signal that is associated with the UE subgroup set index associated with the UE; and receiving or monitoring the first signal on the determined resource.

[0013] In an embodiment of the disclosure, the UE subgroup set index associated with the UE is associated with a time domain resource index for the first signal, and / or the UE subgroup set index associated with the UE is associated with a time-frequency resource index for the first signal, and / or the UE subgroup set index associated with the UE is associated with a time code resource index for the first signal based on an order of first a time domain resource and then a code domain resource, and / or the UE subgroup set index associated with the UE is associated with a time-frequency code resource index for the first signal based on an order of first a frequency domain resource, then a time domain resource and then a code domain resource, and / or the UE subgroup set index associated with the UE is associated with a generated sequence of an overlaid orthogonal frequency division multiplexing (OFDM) sequence and / or a time domain on-off keying (OOK) ON-OFF sequence of the first signal.

[0014] In an embodiment of the disclosure, the method further includes: receiving third information related to a resource monitoring window for the first signal, and receiving or monitoring the first signal based on the information related to the resources for the first signal includes: determining, based on the third information and a UE subgroup set index associated with the UE, a resource among the resources for the first signal that is associated with the UE subgroup set index associated with the UE; receiving or monitoring the first signal on the determined resource.

[0015] In an embodiment of the disclosure, the third information includes at least one of: a period of the resource monitoring window for the first signal; a start position and / or an end position of the resource monitoring window for the first signal; or a duration of the resource monitoring window for the first signal.

[0016] In an embodiment of the disclosure, the method further includes: receiving fourth information related to the resources for the first signal, and receiving or monitoring the first signal based on the information related to the resources for the first signal includes: determining, based on the fourth information and a UE subgroup set index associated with the UE, a resource among the resources for the first signal that is associated with the UE subgroup set index associated with the UE; and receiving or monitoring the first signal on the determined resource.

[0017] In an embodiment of the disclosure, the fourth information includes at least one of: a start position and / or an end position of one or more resources for the first signal; a start position and / or an end position of a first resource for the first signal among more than one resources for the first signal; a start position and / or an end position of a last resource for the first signal among the more than one resources for the first signal; a duration of a resource for the first signal; and a time gap between two adjacent resources for the first signal.

[0018] According to an embodiment of the disclosure, there is provided a method performed by a user equipment (UE) in a wireless communication system, the method including: receiving a second signal, and performing synchronization of a first signal based on the second signal, where the first signal is used for wake up; and receiving a third signal, and correcting an offset of the first signal based on the third signal.

[0019] In an embodiment of the disclosure, a period of the third signal is determined based on a period of the second signal, and / or the third signal includes a predefined time domain on-off keying (OOK) ON-OFF sequence.

[0020] In an embodiment of the disclosure, the method further includes: receiving indication information for indicating whether there is the first signal and / or the third signal in a next period for the first signal.

[0021] In an embodiment of the disclosure, the indication information is indicated by a generated sequence of an overlaid orthogonal frequency division multiplexing (OFDM) sequence.

[0022] In an embodiment of the disclosure, the method further includes: determining, according to a length of a received first signal and a configured length of the first signal, whether the third signal is included in the first signal.

[0023] According to an embodiment of the disclosure, there is provided a method performed by a base station in a wireless communication system, the method including: transmitting first configuration information related to a first signal for wake up, where the first configuration information includes information related to resources for the first signal that are associated with a user equipment (UE) subgroup set index associated with more than one UE subgroup index; and transmitting the first signal based on the information related to the resources for the first signal, where information bits of the first signal and a UE subgroup index associated with the UE are used to determine whether to monitor a paging occasion (PO), and where a number of UE subgroups in a UE subgroup set is associated with a number of the information bits of the first signal.

[0024] In an embodiment of the disclosure, the first configuration information further includes: information related to the number of the information bits of the first signal; or information related to the number of the UE subgroups in the UE subgroup set.

[0025] In an embodiment of the disclosure, the UE subgroup set is associated with one paging occasion, and each UE subgroup set index associated with the paging occasion and a UE subgroup index associated with each UE subgroup set index are determined based on a UE subgroup index associated with the paging occasion and the number of the UE subgroups in the UE subgroup set.

[0026] In an embodiment of the disclosure, each UE subgroup set index associated with the paging occasion and the UE subgroup index associated with each UE subgroup set index are determined by the UE subgroup index associated with the paging occasion modulo the number of the UE subgroups in the UE subgroup set, and / or each UE subgroup set index associated with the paging occasion and the UE subgroup index associated with each UE subgroup set index are determined by rounding a result of dividing the UE subgroup index associated with the paging occasion by the number of the UE subgroups in the UE subgroup set.

[0027] In an embodiment of the disclosure, transmitting the first signal based on the information related to the resources for the first signal includes: determining, based on a UE subgroup set index associated with the UE, a resource among the resources for the first signal that is associated with the UE subgroup set index associated with the UE; and transmitting the first signal on the determined resource.

[0028] In an embodiment of the disclosure, the UE subgroup set index associated with the UE is associated with a time domain resource index for the first signal, and / or the UE subgroup set index associated with the UE is associated with a time-frequency resource index for the first signal, and / or the UE subgroup set index associated with the UE is associated with a time code resource index for the first signal based on an order of first a time domain resource and then a code domain resource, and / or the UE subgroup set index associated with the UE is associated with a time-frequency code resource index for the first signal based on an order of first a frequency domain resource, then a time domain resource and then a code domain resource, and / or the UE subgroup set index associated with the UE is associated with a generated sequence of an overlaid orthogonal frequency division multiplexing (OFDM) sequence and / or a time domain on-off keying (OOK) ON-OFF sequence of the first signal.

[0029] In an embodiment of the disclosure, the method further includes: transmitting third information related to a resource monitoring window for the first signal, and transmitting the first signal based on the information related to the resources for the first signal includes: determining, based on the third information and a UE subgroup set index associated with the UE, a resource among the resources for the first signal that is associated with the UE subgroup set index associated with the UE; and transmitting the first signal on the determined resource.

[0030] In an embodiment of the disclosure, the third information includes at least one of: a period of the resource monitoring window for the first signal; a start position and / or an end position of the resource monitoring window for the first signal; or a duration of the resource monitoring window for the first signal.

[0031] In an embodiment of the disclosure, the method further includes: transmitting fourth information related to the resources for the first signal, and transmitting the first signal based on the information related to the resources for the first signal includes: determining, based on the fourth information and a UE subgroup set index associated with the UE, a resource among the resources for the first signal that is associated with the UE subgroup set index associated with the UE; and transmitting the first signal on the determined resource.

[0032] In an embodiment of the disclosure, the fourth information includes at least one of: a start position and / or an end position of one or more resources for the first signal; a start position and / or an end position of a first resource for the first signal among more than one resources for the first signal; a start position and / or an end position of a last resource for the first signal among the more than one resources for the first signal; a duration of a resource for the first signal; and a time gap between two adjacent resources for the first signal.

[0033] According to an embodiment of the disclosure, there is provided a method performed by a base station in a wireless communication system, including: transmitting a second signal for synchronization of a first signal, where the first signal is used for wake up; and transmitting a third signal for correcting an offset of the first signal.

[0034] In an embodiment of the disclosure, a period of the third signal is determined based on a period of the second signal, and / or the third signal includes a predefined time domain on-off keying (OOK) ON-OFF sequence.

[0035] In an embodiment of the disclosure, the method further includes: transmitting indication information for indicating whether there is the first signal and / or the third signal in a next period for the first signal.

[0036] In an embodiment of the disclosure, the indication information is indicated by a generated sequence of an overlaid orthogonal frequency division multiplexing (OFDM) sequence.

[0037] In an embodiment of the disclosure, a length of a received first signal and a configured length of the first signal are used to determine whether the third signal is included in the first signal.

[0038] According to an embodiment of the disclosure, there is provided a user equipment (UE) in a wireless communication system, including: a transceiver; and a controller coupled with the transceiver and configured to perform the aforementioned methods.

[0039] According to an embodiment of the disclosure, there is provided a base station in a wireless communication system, including: a transceiver; and a controller coupled with the transceiver and configured to perform the aforementioned methods.

[0040] In order to illustrate the technical solutions of the embodiments of the disclosure more clearly, the drawings of the embodiments will be briefly introduced below. Apparently, the drawings in the following descriptions only relate to an embodiment of the disclosure, and do not limit the disclosure. In the drawings:

[0041] FIG. 1 illustrates a schematic diagram of an example wireless network according to an embodiment of the disclosure;

[0042] FIG. 2a and FIG. 2b illustrate example wireless transmission and reception paths according to an embodiment of the disclosure;

[0043] FIG. 3a illustrates an example user equipment (UE) according to an embodiment of the disclosure;

[0044] FIG. 3b illustrates an example gNB according to an embodiment of the disclosure;

[0045] FIG. 4 illustrates a flowchart of a method performed by a UE according to an embodiment of the disclosure;

[0046] FIG. 5 illustrates a flowchart of a method performed by a UE according to an embodiment of the disclosure;

[0047] FIG. 6 illustrates a schematic diagram of a relationship of a wake up signal occasion monitoring window and a paging occasion according to an embodiment of the disclosure;

[0048] FIG. 7 illustrates a schematic diagram of a relationship of one or more wake up signal occasions and a paging occasion according to an embodiment of the disclosure;

[0049] FIG. 8 illustrates a schematic diagram of a relationship of one or more wake up signal occasions and a paging occasion according to an embodiment of the disclosure;

[0050] FIG. 9 illustrates a flowchart of a method performed by a UE according to an embodiment of the disclosure;

[0051] FIG. 10 illustrates a schematic diagram of a mapping relationship of subgroup set index to time domain resources and frequency domain resources according to an embodiment of the disclosure;

[0052] FIG. 11 illustrates a schematic diagram of a mapping relationship of subgroup set index to time domain resources and code domain resources according to an embodiment of the disclosure;

[0053] FIG. 12 illustrates a schematic diagram of a mapping relationship of subgroup set index to time domain resources, frequency domain resources, and code domain resources according to an embodiment of the disclosure;

[0054] FIG. 13 is a block diagram of a UE according to an embodiment of the disclosure; and

[0055] FIG. 14 is a block diagram of a base station according to an embodiment of the disclosure.

[0056] In order to meet the increasing demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also called "Beyond 4G networks" or "Post-LTE systems".

[0057] In order to achieve a higher data rate, 5G communication systems are implemented in higher frequency (millimeter, mmWave) bands, e.g., 60 GHz bands. In order to reduce propagation loss of radio waves and increase a transmission distance, technologies such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming and large-scale antenna are discussed in 5G communication systems.

[0058] In addition, in 5G communication systems, developments of system network improvement are underway based on advanced small cell, cloud radio access network (RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multi-points (CoMP), reception-end interference cancellation, etc.

[0059] In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM), and filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0060] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

[0061] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the disclosure is provided for illustration purpose only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.

[0062] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0063] The term "include" or "may include" refers to the existence of a corresponding disclosed function, operation or component which can be used in various embodiments of the disclosure and does not limit one or more additional functions, operations, or components. The terms such as "include" and / or "have" may be construed to denote a certain characteristic, number, step, operation, constituent element, component or a combination thereof, but may not be construed to exclude the existence of or a possibility of addition of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof.

[0064] The term "or" used in various embodiments of the disclosure includes any or all of combinations of listed words. For example, the expression "A or B" may include A, may include B, or may include both A and B.

[0065] Unless defined differently, all terms used herein, which include technical terminologies or scientific terminologies, have the same meaning as that understood by a person skilled in the art to which the disclosure belongs. Such terms as those defined in a generally used dictionary are to be interpreted to have the meanings equal to the contextual meanings in the relevant field of art, and are not to be interpreted to have ideal or excessively formal meanings unless clearly defined in the disclosure.

[0066] FIG. 1 illustrates an example wireless network 100 according to an embodiment of the disclosure. The embodiment of the wireless network 100 shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 can be used without departing from the scope of the disclosure.

[0067] The wireless network 100 includes a gNodeB (gNB) 101, a gNB 102, and a gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a private IP network, or other data networks.

[0068] Depending on a type of the network, other well-known terms such as "base station" or "access point" can be used instead of "gNodeB" or "gNB". For convenience, the terms "gNodeB" and "gNB" are used in this patent document to refer to network infrastructure components that provide wireless access for remote terminals. and, depending on the type of the network, other well-known terms such as "mobile station", "user station", "remote terminal", "wireless terminal" or "user apparatus" can be used instead of "user equipment" or "UE". For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to remote wireless devices that wirelessly access the gNB, no matter whether the UE is a mobile device (such as a mobile phone or a smart phone) or a fixed device (such as a desktop computer or a vending machine).

[0069] gNB 102 provides wireless broadband access to the network 130 for a first plurality of User Equipments (UEs) within a coverage area 120 of gNB 102. The first plurality of UEs include a UE 111, which may be located in a Small Business (SB); a UE 112, which may be located in an enterprise (E); a UE 113, which may be located in a WiFi Hotspot (HS); a UE 114, which may be located in a first residence (R); a UE 115, which may be located in a second residence (R); a UE 116, which may be a mobile device (M), such as a cellular phone, a wireless laptop computer, a wireless PDA, etc. GNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within a coverage area 125 of gNB 103. The second plurality of UEs include a UE 115 and a UE 116. In an embodiment, one or more of gNBs 101-103 can communicate with each other and with UEs 111-116 using 5G, Long Term Evolution (LTE), LTE-A, WiMAX or other advanced wireless communication technologies.

[0070] The dashed lines show approximate ranges of the coverage areas 120 and 125, and the ranges are shown as approximate circles merely for illustration and explanation purposes. It should be clearly understood that the coverage areas associated with the gNBs, such as the coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on configurations of the gNBs and changes in the radio environment associated with natural obstacles and man-made obstacles.

[0071] As will be described in more detail below, one or more of gNB 101, gNB 102, and gNB 103 include a 2D antenna array as described in an embodiment of the disclosure. In an embodiment, one or more of gNB 101, gNB 102, and gNB 103 support codebook designs and structures for systems with 2D antenna arrays.

[0072] Although FIG. 1 illustrates an example of the wireless network 100, various changes can be made to FIG. 1. The wireless network 100 can include any number of gNBs and any number of UEs in any suitable arrangement, for example. Furthermore, gNB 101 can directly communicate with any number of UEs and provide wireless broadband access to the network 130 for those UEs. Similarly, each gNB 102-103 can directly communicate with the network 130 and provide direct wireless broadband access to the network 130 for the UEs. In addition, gNB 101, 102 and / or 103 can provide access to other or additional external networks, such as external telephone networks or other types of data networks.

[0073] FIG. 2a and FIG. 2b illustrate example wireless transmission and reception paths according to the disclosure. In the following description, the transmission path 200 can be described as being implemented in a gNB, such as gNB 102, and the reception path 250 can be described as being implemented in a UE, such as UE 116. However, it should be understood that the reception path 250 can be implemented in a gNB and the transmission path 200 can be implemented in a UE. In an embodiment, the reception path 250 is configured to support codebook designs and structures for systems with 2D antenna arrays as described in an embodiment of the disclosure.

[0074] The transmission path 200 includes a channel coding and modulation block 205, a Serial-to-Parallel (S-to-P) block 210, a size N Inverse Fast Fourier Transform (IFFT) block 215, a Parallel-to-Serial (P-to-S) block 220, a cyclic prefix addition block 225, and an up-converter (UC) 230. The reception path 250 includes a down-converter (DC) 255, a cyclic prefix removal block 260, a Serial-to-Parallel (S-to-P) block 265, a size N Fast Fourier Transform (FFT) block 270, a Parallel-to-Serial (P-to-S) block 275, and a channel decoding and demodulation block 280.

[0075] In the transmission path 200, the channel coding and modulation block 205 receives a set of information bits, applies coding (such as Low Density Parity Check (LDPC) coding), and modulates the input bits (such as using Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM)) to generate a sequence of frequency-domain modulated symbols. The Serial-to-Parallel (S-to-P) block 210 converts (such as demultiplexes) serial modulated symbols into parallel data to generate N parallel symbol streams, where N is a size of the IFFT / FFT used in gNB 102 and UE 116. The size N IFFT block 215 performs IFFT operations on the N parallel symbol streams to generate a time-domain output signal. The Parallel-to-Serial block 220 converts (such as multiplexes) parallel time-domain output symbols from the Size N IFFT block 215 to generate a serial time-domain signal. The cyclic prefix addition block 225 inserts a cyclic prefix into the time-domain signal. The up-converter 230 modulates (such as up-converts) the output of the cyclic prefix addition block 225 to an RF frequency for transmission via a wireless channel. The signal can also be filtered at a baseband before switching to the RF frequency.

[0076] The RF signal transmitted from gNB 102 arrives at UE 116 after passing through the wireless channel, and operations in reverse to those at gNB 102 are performed at UE 116. The down-converter 255 down-converts the received signal to a baseband frequency, and the cyclic prefix removal block 260 removes the cyclic prefix to generate a serial time-domain baseband signal. The Serial-to-Parallel block 265 converts the time-domain baseband signal into a parallel time-domain signal. The Size N FFT block 270 performs an FFT algorithm to generate N parallel frequency-domain signals. The Parallel-to-Serial block 275 converts the parallel frequency-domain signal into a sequence of modulated data symbols. The channel decoding and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.

[0077] Each of gNBs 101-103 may implement a transmission path 200 similar to that for transmitting to UEs 111-116 in the downlink, and may implement a reception path 250 similar to that for receiving from UEs 111-116 in the uplink. Similarly, each of UEs 111-116 may implement a transmission path 200 for transmitting to gNBs 101-103 in the uplink, and may implement a reception path 250 for receiving from gNBs 101-103 in the downlink.

[0078] Each of the components in FIG. 2a and FIG. 2b can be implemented using only hardware, or using a combination of hardware and software / firmware. As a specific example, at least some of the components in FIG. 2a and FIG. 2b may be implemented in software, while other components may be implemented in configurable hardware or a combination of software and configurable hardware. For example, the FFT block 270 and IFFT block 215 may be implemented as configurable software algorithms, in which the value of the size N may be modified according to the implementation.

[0079] Furthermore, although described as using FFT and IFFT, this is only illustrative and should not be interpreted as limiting the scope of the disclosure. Other types of transforms can be used, such as Discrete Fourier transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions. It should be understood that for DFT and IDFT functions, the value of variable N may be any integer (such as 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of variable N may be any integer which is a power of 2 (such as 1, 2, 4, 8, 16, etc.).

[0080] Although FIG. 2a and FIG. 2b illustrate examples of wireless transmission and reception paths, various changes may be made to FIG. 2a and FIG. 2b. For example, various components in FIG. 2a and FIG. 2b can be combined, further subdivided or omitted, and additional components can be added according to specific requirements. Furthermore, FIG. 2a and FIG. 2b are intended to illustrate examples of types of transmission and reception paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communication in a wireless network.

[0081] FIG. 3a illustrates an example UE 116 according to the disclosure. The embodiment of UE 116 shown in FIG. 3a is for illustration only, and UEs 111-115 of FIG. 1 can have the same or similar configuration. However, a UE has various configurations, and FIG. 3a does not limit the scope of the disclosure to any specific implementation of the UE.

[0082] UE 116 includes an antenna 305, a radio frequency (RF) transceiver 310, a transmission (TX) processing circuit 315, a microphone 320, and a reception (RX) processing circuit 325. UE 116 also includes a speaker 330, a processor / controller 340, an input / output (I / O) interface 345, an input device(s) 350, a display 355, and a memory 360. The memory 360 includes an operating system (OS) 361 and one or more applications 362.

[0083] The RF transceiver 310 receives an incoming RF signal transmitted by a gNB of the wireless network 100 from the antenna 305. The RF transceiver 310 down-converts the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 325, where the RX processing circuit 325 generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. The RX processing circuit 325 transmits the processed baseband signal to speaker 330 (such as for voice data) or to processor / controller 340 for further processing (such as for web browsing data).

[0084] The TX processing circuit 315 receives analog or digital voice data from microphone 320 or other outgoing baseband data (such as network data, email or interactive video game data) from processor / controller 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the outgoing processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal into an RF signal transmitted via the antenna 305.

[0085] The processor / controller 340 can include one or more processors or other processing devices and execute an OS 361 stored in the memory 360 in order to control the overall operation of UE 116. For example, the processor / controller 340 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceiver 310, the RX processing circuit 325 and the TX processing circuit 315 according to well-known principles. In an embodiment, the processor / controller 340 includes at least one microprocessor or microcontroller.

[0086] The processor / controller 340 is also capable of executing other processes and programs residing in the memory 360, such as operations for channel quality measurement and reporting for systems with 2D antenna arrays as described in an embodiment of the disclosure. The processor / controller 340 can move data into or out of the memory 360 as required by an execution process. In an embodiment, the processor / controller 340 is configured to execute the application 362 based on the OS 361 or in response to signals received from the gNB or the operator. The processor / controller 340 is also coupled to an I / O interface 345, where the I / O interface 345 provides UE 116 with the ability to connect to other devices such as laptop computers and handheld computers. I / O interface 345 is a communication path between these accessories and the processor / controller 340.

[0087] The processor / controller 340 is also coupled to the input device(s) 350 and the display 355. An operator of UE 116 can input data into UE 116 using the input device(s) 350. The display 355 may be a liquid crystal display or other display capable of presenting text and / or at least limited graphics (such as from a website). The memory 360 is coupled to the processor / controller 340. A part of the memory 360 can include a random access memory (RAM), while another part of the memory 360 can include a flash memory or other read-only memory (ROM).

[0088] Although FIG. 3a illustrates an example of UE 116, various changes can be made to FIG. 3a. For example, various components in FIG. 3a can be combined, further subdivided or omitted, and additional components can be added according to specific requirements. As a specific example, the processor / controller 340 can be divided into a plurality of processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Furthermore, although FIG. 3a illustrates that the UE 116 is configured as a mobile phone or a smart phone, UEs can be configured to operate as other types of mobile or fixed devices.

[0089] FIG. 3b illustrates an example gNB 102 according to the disclosure. The embodiment of gNB 102 shown in FIG. 3b is for illustration only, and other gNBs of FIG. 1 can have the same or similar configuration. However, a gNB has various configurations, and FIG. 3b does not limit the scope of the disclosure to any specific implementation of a gNB. It should be noted that gNB 101 and gNB 103 can include the same or similar structures as gNB 102.

[0090] As shown in FIG. 3b, gNB 102 includes a plurality of antennas 370a-370n, a plurality of RF transceivers 372a-372n, a transmission (TX) processing circuit 374, and a reception (RX) processing circuit 376. In an embodiment, one or more of the plurality of antennas 370a-370n include a 2D antenna array. gNB 102 also includes a controller / processor 378, a memory 380, and a backhaul or network interface 382.

[0091] RF transceivers 372a-372n receive an incoming RF signal from antennas 370a-370n, such as a signal transmitted by UEs or other gNBs. RF transceivers 372a-372n down-convert the incoming RF signal to generate an IF or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 376, where the RX processing circuit 376 generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. RX processing circuit 376 transmits the processed baseband signal to controller / processor 378 for further processing.

[0092] The TX processing circuit 374 receives analog or digital data (such as voice data, network data, email or interactive video game data) from the controller / processor 378. TX processing circuit 374 encodes, multiplexes and / or digitizes outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 372a-372n receive the outgoing processed baseband or IF signal from TX processing circuit 374 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 370a-370n.

[0093] The controller / processor 378 can include one or more processors or other processing devices that control the overall operation of gNB 102. For example, the controller / processor 378 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceivers 372a-372n, the RX processing circuit 376 and the TX processing circuit 374 according to well-known principles. The controller / processor 378 can also support additional functions, such as higher-level wireless communication functions. For example, the controller / processor 378 can perform a Blind Interference Sensing (BIS) process such as that performed through a BIS algorithm, and decode a received signal from which an interference signal is subtracted. A controller / processor 378 may support any of a variety of other functions in gNB 102. In an embodiment, the controller / processor 378 includes at least one microprocessor or microcontroller.

[0094] The controller / processor 378 is also capable of executing programs and other processes residing in the memory 380, such as a basic OS. The controller / processor 378 can also support channel quality measurement and reporting for systems with 2D antenna arrays as described in an embodiment of the disclosure. In an embodiment, the controller / processor 378 supports communication between entities such as web RTCs. The controller / processor 378 can move data into or out of the memory 380 as required by an execution process.

[0095] The controller / processor 378 is also coupled to the backhaul or network interface 382. The backhaul or network interface 382 allows gNB 102 to communicate with other devices or systems through a backhaul connection or through a network. The backhaul or network interface 382 can support communication over any suitable wired or wireless connection(s). For example, when gNB 102 is implemented as a part of a cellular communication system, such as a cellular communication system supporting 5G or new radio access technology or NR, LTE or LTE-A, the backhaul or network interface 382 can allow gNB 102 to communicate with other gNBs through wired or wireless backhaul connections. When gNB 102 is implemented as an access point, the backhaul or network interface 382 can allow gNB 102 to communicate with a larger network, such as the Internet, through a wired or wireless local area network or through a wired or wireless connection. The backhaul or network interface 382 includes any suitable structure that supports communication through a wired or wireless connection, such as an Ethernet or an RF transceiver.

[0096] The memory 380 is coupled to the controller / processor 378. A part of the memory 380 can include an RAM, while another part of the memory 380 can include a flash memory or other ROMs. In an embodiment, a plurality of instructions, such as the BIS algorithm, are stored in the memory. The plurality of instructions are configured to cause the controller / processor 378 to execute the BIS process and decode the received signal after subtracting at least one interference signal determined by the BIS algorithm.

[0097] As will be described in more detail below, the transmission and reception paths of gNB 102 (implemented using RF transceivers 372a-372n, TX processing circuit 374 and / or RX processing circuit 376) support aggregated communication with FDD cells and TDD cells.

[0098] Although FIG. 3b illustrates an example of gNB 102, various changes may be made to FIG. 3b. For example, gNB 102 can include any number of each component shown in FIG. 3a. As a specific example, the access point can include many backhaul or network interfaces 382, and the controller / processor 378 can support routing functions to route data between different network addresses. As another specific example, although shown as including a single instance of the TX processing circuit 374 and a single instance of the RX processing circuit 376, gNB 102 can include multiple instances of each (such as one for each RF transceiver).

[0099] In order to make the purpose, technical solutions and advantages of the disclosure clearer, the embodiments of the disclosure will be further described in detail below in conjunction with the accompanying drawings.

[0100] The text and drawings are provided as examples only to help readers understand the disclosure. They are not intended and should not be interpreted as limiting the scope of the disclosure in any way. Although certain embodiments and examples have been provided, based on the content disclosed herein, it is obvious to those skilled in the art that modifications to the illustrated embodiments and examples can be made without departing from the scope of the disclosure.

[0101] A time domain unit (also referred to as a time unit) in the disclosure may be: an OFDM symbol, an OFDM symbol group (for example, consisting of more than one OFDM symbols), a slot, a slot group (for example, consisting of more than one slots), a subframe, a subframe group (for example, consisting of more than one subframes), a system frame, a system frame group (for example, consisting of more than one system frames); also an absolute time unit, such as 1 millisecond, 1 second, etc.; and the time unit may also be a combination of more than one granularities, e.g., N1 slots plus N2 OFDM symbols; also a time length of an OOK chip.

[0102] A frequency domain unit (also referred to as a frequency unit) in the disclosure may be: a subcarrier, a subcarrier group (for example, consisting of more than one subcarriers), a resource block (RB) (which may also be referred to as a physical resource block (PRB)), a resource block group (for example, consisting of more than one RBs), a bandwidth part (BWP), a bandwidth part group (for example, consisting of more than one BWPs), a band / carrier, a band group / carrier group; also an absolute frequency domain unit, such as 1 hertz, 1 kilohertz, etc.; and the frequency domain unit may also be a combination of more than one granularities, e.g., M1 PRBs plus M2 subcarriers.

[0103] Herein, "index" and "ID" may be used interchangeably.

[0104] Herein, "bit" and "bit information" and "information bit" may be used interchangeably.

[0105] Herein, "start position" and "start" may be used interchangeably, and "end position" and "end" may be used interchangeably.

[0106] A transmission link of a wireless communication system mainly includes: a downlink communication link from a 5G New Radio (NR) gNB to a user equipment (UE), an uplink communication link from a UE to a network, and a sidelink communication link from a UE to a UE.

[0107] In wireless communication systems, such as in current wireless communication systems, in order to reduce energy consumption on a terminal side, a Discontinuous Reception (DRX) mechanism is introduced. In a radio resource control (RRC) inactive state and / or idle state, a DRX cycle is equal to a paging cycle, and a UE monitors a paging occasion (PO) in each DRX cycle, and in each DRX cycle, the UE is in a sleep state and does not need to monitor a physical downlink control channel (PDCCH) at most of the time except the paging occasion. When the UE monitors a PDCCH scrambled by a paging radio network temporary identifier (P-RNTI) in the corresponding PO, the UE continues to read a paged terminal identifier in a paging message. If the read terminal identifier is the same as its own identifier, the UE further reads the paging message, otherwise, it discards the paging message. In the above procedure, in order to further reduce energy consumption of the UE, a paging early indication (PEI) signal is introduced to indicate whether the UE needs to monitor the corresponding PO. If the PEI is configured by system information, the UE monitors a PEI occasion once in each DRX cycle, and if the UE detects the PEI indication and the PEI indicates the UE to monitor the associated PO, the UE should wake up in an associated PO to monitor the PO; otherwise, the UE does not need to wake up to monitor the PO.

[0108] In some use cases with stricter UE low energy consumption requirements (such as Internet of Things devices and / or wearable devices), in order to further extend the battery life of the UE, the wireless communication system can use a new low power wake up signal (LPWUS) to wake up the UE. Therefore, there is a need to improve the LPWUS configuration and monitoring procedure.

[0109] In the disclosure, a method and a device for low power wake up signal configuration and monitoring will be introduced. In an embodiment of the disclosure, the method will be introduced to determine the configuration of a wake up signal occasion (may be referred to as LPWUS occasion, LO), the method of performing LP-WUS synchronization using additional synchronization signals, the method of determining a UE subgroup set based on a UE subgroup monitoring the same paging occasion, and an association relationship of the wake up signal occasion and the UE subgroup set. In the embodiment, a wake up signal is used for an exemplary introduction, where the wake up signal includes but is not limited to the LPWUS signal, and the introduced method can also be used for the configuration and transmission of other signals.

[0110] In an embodiment, a receiver of the UE includes two modules, one is a main wireless communication module (may be referred to as Main Radio, MR) for receiving regular signals / channels transmitted by a base station, and the other is a low power wake up signal receiving module (may be referred to as Lower Power Wake Up Receiver, LPWUR) for receiving wake up signals transmitted by the base station, The dedicated module is used to receive the wake up signal because the LPWUS is a waveform modulated further based on amplitude shift keying (ASK) on the basis of using the orthogonal frequency division multiplexing (OFDM) based waveform or sequence of the existing NR system, the LPWUR can monitor the wake up signal with extremely low power. Once the UE monitors the wake up signal, the LPWUR can trigger the MR to switch from the dormant period to the active period, start drx-onDurationTimer or perform PDCCH monitoring. Optionally, on-off keying (OOK) modulation is a special case of amplitude shift keying (ASK) modulation. An orthogonal frequency division multiplex (OFDM) based waveform or sequence may include an overlaid OFDM sequence.

[0111] FIG. 4 illustrates a flowchart of a method performed by a UE according to an embodiment of the disclosure. Referring to FIG. 4, at S401, the UE receives first configuration information related to a first signal for wake up, where the first configuration information includes information related to resources for the first signal that are associated with a UE subgroup set index associated with more than one UE subgroup index. At S402, the UE receives or monitors the first signal based on the information related to the resources for the first signal. At S403, the UE determines, based on information bits of the first signal and a UE subgroup index associated with the UE, whether to monitor a paging occasion (PO). Optionally, the number of UE subgroups in one UE subgroup set is associated with the number of the information bits of the first signal.

[0112] In an embodiment, the UE may perform monitoring of a wake up signal based on one or more wake up signal occasions (LOs) configured by system information, where each wake up signal occasion may be associated with one or more UE subgroup sets, which may be determined based on a subgroup associated with a paging occasion. In order to support a multi-beam operation, in one LO, one or more wake up signal monitoring occasions (may be referred to as LP-WUS monitoring occasions, MOs) can be configured, and the UE can monitor the wake up signal in each MO. If the UE monitors the wake up signal in one MO, the UE does not monitor or does not expect to monitor subsequent MOs in the LO. If the monitored wake up signal indicates that the UE is waked up, an MR of the UE wakes up to monitor an associated PO, and the procedure of the UE monitoring the wake up signal to trigger PO monitoring is shown in FIG. 5.

[0113] In an embodiment, the UE acquires configuration information of an LO monitoring window through a system information configuration, such as system information block 1 (SIB1) configuration. The UE may blindly detect a wake up signal in the configured monitoring window. If the UE detects the wake up signal and / or the wake up signal indicates that the UE is waked up, the MR of the UE wakes up to monitor an associated paging occasion. The configuration information of the LO monitoring window includes one or a combination of two or more of:

[0114] ○ a period of the LO monitoring window. The period of the LO monitoring window may be configured by a network. Optionally, the period of the LO monitoring window is equal to a paging cycle.

[0115] ○ a start and / or an end of the LO monitoring window. The start of the LO monitoring window may be determined by a start of the associated PO and an offset L1, where the offset L1 is an offset from the start of the associated PO to the start of the LO monitoring window. The end of the LO monitoring window may be determined by the start of the associated PO and an offset L2, where the offset L2 is an offset from the start of the associated PO to the end of the LO monitoring window. L1 and L2 may be time unit values predefined or preconfigured by the network and / or determined by UE capabilities reported by the UE, and may be real numbers greater than 0. The configured offsets L1 and L2 can ensure that the UE has enough wake-up time after receiving the wake up signal to wake up the main receiver of the UE to monitor the associated PO, as shown in FIG. 6.

[0116] ○ a duration of the LO monitoring window. If the start of the LO monitoring window is configured, the duration of the LO monitoring window should ensure that a time gap from an end position of the duration of the LO monitoring window to a start of a PO is greater than and / or equal to a wake-up time of the MR. If the time gap from the end position of the duration of the LO monitoring window to the start of the PO is less than the wake-up time and / or synchronization time of the MR, the UE does not monitor or does not expect to monitor the PO associated with the wake up signal, or the UE expects to monitor a PO in a next paging cycle after the current paging cycle associated with the wake up signal transmitted in the LO monitoring window, and / or the UE does not monitor or does not expect to monitor a wake up signal transmitted in an LO that overlaps with a time gap determined by the start of the PO and an offset satisfying the wake-up time and / or synchronization time of the MR. This operation is to ensure that there is sufficient time to wake up the MR of the UE after the UE receives the wake up signal. The duration of the LO monitoring window may be determined based on the preconfigured or predefined number of wake up signal monitoring occasions (MOs) and / or duration of the MO and / or time gap between MOs. Optionally, an end position of the last MO configured in the LO monitoring window is the end position of the LO monitoring window.

[0117] In an embodiment, the UE acquires configuration information of an LO through a system information configuration, such as SIB1 configuration. The UE may monitor or blindly detect a wake up signal in the configured LO. If the UE detects the wake up signal and / or the wake up signal indicates that the UE is waked up, the MR of the UE wakes up to monitor an associated paging occasion. The configuration information of the LO includes one or a combination of two or more of:

[0118] ○ a start and / or an end of one or more LOs. The start of one or more LOs may be determined by a start of the associated PO and one or more offsets Ki, where the offset Kiis an offset from the start of the associated PO to a start of each LO. The end of one or more LOs may be determined by the start of the associated PO and one or more offsets Ri, where the offset Riis an offset from the start of the associated PO to an end of each LO, as shown in FIG. 7. Kiand Rimay be time unit values predefined or preconfigured by the network and / or determined by UE capabilities reported by the UE, and may be real numbers greater than 0. A value ofiis a positive integer greater than 0. The maximum value Z ofimay be equal to the number of subgroup sets associated with one PO, and / or the maximum value Z ofimay be equal to the number of subgroups associated with one PO divided by the number of information bits of the wake up signal, and / or the maximum value Z ofimay be equal to the number of the subgroups associated with one PO divided by 2 raised to a power of the number of the information bits of the wake up signal. The configured offset from the end position of each LO to the start position of the PO should be greater than a wake-up time and / or synchronization time of the MR. This operation is to ensure that the UE has sufficient wake-up time after receiving the wake up signal to wake up the main receiver of the UE to monitor the associated PO. If the time gap or offset from the end position of each LO to the start position of the PO is less than the wake-up time of the MR, the UE does not monitor or does not expect to monitor the PO associated with the wake up signal transmitted in the LO, or the UE expects to monitor a PO in a next paging cycle after the current paging cycle associated with the wake up signal transmitted in the LO, and / or the UE does not monitor or does not expect to monitor the wake up signal transmitted in the LO.

[0119] ○ a start or an end of the first LO of more than one LOs. The start of the first LO of more than one LOs may be determined by the start of the associated PO and an offsetP1, where the offsetP1 is an offset from the start of the associated PO to the start of the first LO. Alternatively, the end of the first LO of more than one LOs may be determined by the start of the associated PO and an offsetP2, where the offsetP2 is an offset from the start of the associated PO to the end of the first LO, as shown in FIG. 8.

[0120] ○ a start and / or an end of the last LO of more than one LOs. The start of the last LO of more than one LOs may be determined by the start of the associated PO and an offsetP3, where the offsetP3 is an offset from the start of the associated PO to the start of the last LO. The end of the last LO of more than one LOs may be determined by the start of the associated PO and an offsetP4, where the offsetP4 is an offset from the start of the associated PO to the end of the last LO, as shown in FIG. 8. The configured offset from the end of the last LO of more than one LOs to the start position of the PO should be greater than a wake-up time and / or synchronization time of the MR. This operation is to ensure that the UE has sufficient wake-up time after receiving the wake up signal to wake up the main receiver of the UE to monitor the associated PO. If the time gap or offset from the end of the last LO of more than one LOs to the start position of the PO is less than the wake-up time and / or synchronization time of the MR, the UE does not monitor or does not expect to monitor the PO associated with the wake up signal transmitted in the LO, or the UE expects to monitor a PO in a next paging cycle after the current paging cycle associated with the wake up signal transmitted in the LO, and / or the UE does not monitor or does not expect to monitor the wake up signal transmitted in the LO, and / or the UE only expects to monitor an LO before a time unit determined by the start position of the PO and the offset satisfying the wake-up time and / or synchronization time of the MR.

[0121] ○ a duration of an LO. If the start of one or more LOs is determined based on the start of the PO and configured one or more offsets Ki, the end of one or more LOs may be determined by the start of one or more LOs and the duration of the LO, where the duration of one or more LOs may be the same, e.g., all equal to a configured duration of the LO. A gap between the end of the LO and a start of a next LO should be equal to or greater than 0, where this limitation should be guaranteed by the network configuration. Alternatively, the duration of the LO may be determined based on the preconfigured or predefined number of wake up signal monitoring occasions (MOs) and / or duration of the MO and / or time gap between MOs. Optionally, the configured end position of the last MO in the LO is the end position of the LO.

[0122] ○ a time gap between two LOs. The time gap is an offset from an end position of a previous LO to a start position of a next LO. For example, the UE may determine the start position of the next LO based on the start of the first LO of more than one LOs and the duration of the LO and the time gap between two LOs which are configured, and so on. For another example, the UE may determine the start position of the next LO based on the end of the first LO of more than one LOs and the time gap between two LOs which are configured, and so on, as shown in FIG. 8.

[0123] FIG. 9 illustrates a flowchart of a method performed by a UE according to an embodiment of the disclosure. Referring to FIG. 9, at S901, the UE receives a second signal, and performs synchronization of a first signal based on the second signal, where the first signal is used for wake up. At S902, the UE receives a third signal, and corrects an offset of the first signal based on the third signal.

[0124] In an embodiment, the UE acquires configuration information of a first synchronization signal for wake up signal synchronization, such as the configuration information of a low power synchronization signal (LP-SS), through a system information configuration, such as SIB1 configuration. The first synchronization signal is a cell-specific synchronization signal, and a base station broadcasts the first synchronization signal according to a configured period of the first synchronization signal for calibration of the wake up signal. In order to reduce energy consumption of the UE monitoring the first synchronization signal and energy consumption of the network broadcasting the first synchronization signal, the period of the first synchronization signal should be much greater than a period of a synchronization signal block (SSB), for example, it may be configured as 160 ms or 320 ms and / or multiples of 160 ms or 320 ms. At this time, when the wake up signal is configured to be transmitted with a higher data rate, for example, when the wake up signal is transmitted using OOK-4 (which may refer to precoded multi-bit OOK), the first synchronization signal with a large period cannot satisfy synchronization requirements of the wake up signal, and the first synchronization signal is only used for coarse synchronization of the wake up signal. At this time, a second synchronization signal may be configured before a part of data of the wake up signal to correct a time offset of the wake up signal, so that the UE can correctly decode data information of the wake up signal. For example, the second synchronization signal may be used for fine synchronization of the wake up signal. The configuration method and / or indication method for the second synchronization signal includes one or a combination of two or more of:

[0125] ○ a network configuring the first synchronization signal through system information, such as SIB1 and / or RRC signaling configuration. A period of the second synchronization signal may be calculated based on the configured period of the first synchronization signal. For example, the period of the second synchronization signal is equal to the period of the first synchronization signal divided by N, where a value range of N is a power of 2 greater than 1. This solution is to correct a time offset of the wake up signal transmitted between the first synchronization signal configured with a large period through the second synchronization signal. Compared with the first synchronization signal transmitted with a small period, the energy consumption of the UE monitoring the broadcast first synchronization signal and the energy consumption of the network broadcasting the first synchronization signal in the network can be saved.

[0126] ○ indicating a format of a subsequent wake up signal through a previous wake up signal, where the format of the wake up signal includes at least one of: only the wake up signal part, only the second synchronization signal part, a combined transmission of the second synchronization signal and the wake up signal, and not transmitting the wake up signal and not transmitting the second synchronization signal. The combined transmission of the second synchronization signal and the wake up signal may be that an end position of a transmission of the second synchronization signal is equal to a start position of the wake up signal, or the start position of the wake up signal is determined by the end position of the transmission of the second synchronization signal and a preconfigured or predefined offset. The method for the previous wake up signal to indicate the format of the subsequent wake up signal may be that information bits of the previous wake up signal indicate that the format of the subsequent wake up signal is one of the predefined formats of the wake up signal through 2 bits, for example, 00 indicates only the wake up signal part, 01 indicates only the second synchronization signal part, and so on; or the format of the next wake up signal is indicated by a format indicator of the wake up signal carried by coded bits of the previous wake up signal; or a time domain OOK ON-OFF sequence or overlaid OFDM sequence of the previous wake up signal indicates that the format of the subsequent wake up signal is one of the predefined formats of the wake up signal through 4 sequences, for example, predefined sequence one indicates only the wake up signal part, predefined sequence two indicates only the second synchronization signal part, and so on; by default, the wake up signal does not include the second synchronization signal, for example, only the wake up signal part. The coded bits of the wake up signal include at least one of: information bits of the wake up signal, CRC, and formats of the wake up signal.

[0127] ○ a format indicator of the wake up signal implied by a generated sequence of the overlaid OFDM sequence indicating a format of a current wake up signal, for example, CRC and / or generated bits of the overlaid OFDM sequence scrambled using the format indicator of the wake up signal indicating the format of the current wake up signal; or the format indicator of the wake up signal implied by a time domain OOK ON-OFF sequence of the wake up signal indicating the format of the current wake up signal, for example, CRC and / or generating bits of the OOK ON-OFF sequence scrambled using the format indicator of the wake up signal indicating the format of the current wake up signal; by default, the wake up signal does not include the second synchronization signal, for example, only the wake up signal part. The format indicator of the wake up signal may be 0 indicating only the wake up signal part, 1 indicating only the second synchronization signal part, and 2 indicating the combined transmission of the second synchronization signal and the wake up signal.

[0128] ○ predefining a time domain OOK ON-OFF sequence of the second synchronization signal as a special sequence. For example, within a configured duration of the second synchronization signal, high and low levels of each OOK chip occur alternately. When the UE receives the special sequence, the UE determines a start and / or end position of the OOK chip according to the alternating high and low levels, or determines a start and / or end position of an OFDM symbol through a configured chip rate (such as OOK-1, OOK-4) and / or the number M of OOK chips corresponding to one OFDM symbol, thereby correcting a time domain offset of the wake up signal.

[0129] ○ the UE determining whether there is a transmission of the second synchronization signal according to a length of the received wake up signal and a configured length of the wake up signal. If the length of the wake up signal received by the UE is greater than the length of the wake up signal configured by the system information or RRC signaling, the UE determines a start position of the second synchronization signal as a start position of the wake up signal received by the UE, and the UE determines the duration of the second synchronization signal as the length of the received wake up signal minus the configured length of the wake up signal, and an end position of the second synchronization signal is the start position of the wake up signal. This method is suitable for the case where the wake up signal and the second synchronization signal of the UE use the same overlaid OFDM sequence, for example, the case where the UE detects the wake up signal through the same overlaid OFDM sequence.

[0130] In an embodiment, considering that one PO can be associated with more than one UE subgroups, when the number of UEs remains unchanged, the more the number of UE subgroups, the fewer the number of UEs that are waked up but do not need to monitor the PO. At this time, since the UE does not need to be waked up to monitor paging messages that do not belong to itself, energy consumption of the UE will be reduced accordingly. However, due to the limited number of bits of a wake up signal, it may not be possible to indicate the large number of subgroups associated with the PO in one wake up signal. An optional method is to further divide the subgroups associated with one PO into subgroup sets, for example, more than one subgroup sets are associated with one PO. A universal set of the subgroup sets associated with one PO is equal to a universal set of the subgroups associated with one PO. The grouping method of the subgroup sets may include one or a combination of two or more of:

[0131] ○ a network configuring the number SubgroupSetNumPerPO of subgroup sets associated with each PO or the number subgroupNumPerSubgroupSet of subgroups in each subgroup set through system information, such as SIB1. The UE can determine the number of the subgroup sets associated with each PO by dividing the configured number of subgroups associated with each PO by the number of the subgroups in each subgroup set, or the UE can determine the number of the subgroups in each subgroup set by dividing the configured number of the subgroups associated with each PO by the number of the subgroup sets associated with each PO. Optionally, if information bits of the wake up signal indicate that more than one subgroups in one subgroup set are waked up using a codepoint or a sequence, for example, the information bits of the wake up signal may be divided into more than one segments, and each segment may be used to indicate that one subgroup in one subgroup set is waked up. The number of the segments may be determined according to the configured number of the subgroup sets associated with each PO or the number of the subgroups in each subgroup set. For example, the UE determines that the number of the segments is equal to the configured number of the subgroups in each subgroup set.

[0132] ○ the UE determining the number of the subgroups in each subgroup set through the configured number of the information bits of the wake up signal. For example, if the information bits of the wake up signal indicate whether each subgroup in one subgroup set is waked up using a bitmap, the number of the subgroups in each subgroup set is equal to the configured number of the information bits of the wake up signal. For another example, if the information bits of the wake up signal indicate that one subgroup in one subgroup set is waked up using a codepoint or a sequence, the number of the subgroups in each subgroup set is equal to 2 raised to a power of the configured number of the information bits of the wake up signal. For yet another example, if the information bits of the wake up signal indicate that more than one subgroups in one subgroup set are waked up using the codepoint or the sequence, for example, using some bits in the wake up signal to wake up one subgroup, such as 4 bits to wake up one subgroup, the information bits of the wake up signal may be divided into C segments, and each segment may be used to indicate that one subgroup in one subgroup set is waked up. The number of the subgroups in each subgroup set is equal to the number of the segments, which may be preconfigured or predefined.

[0133] In an embodiment, the determination method for an association relationship of a subgroup set index associated with one PO and a subgroup may include one or a combination of two or more of:

[0134] ○ the subgroup set index associated with one PO equalling a subgroup index associated with one PO modulo the number of subgroups in each subgroup set, e.g., SubgroupSetID = (SubgroupID mod subgroupNumPerSubgroupSet);

[0135] ○ the subgroup set index associated with one PO equalling the subgroup index associated with one PO divided by an upper bound of the number of the subgroups in each subgroup set, e.g., SubgroupSetID = upper bound (SubgroupID / subgroupNumPerSubgroupSet);

[0136] In an embodiment, an association relationship of time domain and / or code domain and / or frequency domain resources of an LO and subgroup set index may be established, and the indication method for the association relationship may include one or a combination of two or more of:

[0137] ○ the UE determining associated time domain LO resource index (ID) or resource positions according to the subgroup set index. The subgroup set index may correspond to the time domain LO resource index (ID) or resource positions one by one according to an ascending order of numbers, for example, subgroup set index 1 corresponds to time domain LO resource index 1, subgroup set index 2 corresponds to time domain LO resource index 2, and so on. If the UE detects a wake up signal within the associated LO resource index (ID) or resource position, the UE determines whether it is waked up to monitor a PO based on an indication of a codepoint or sequence or an information bit of the wake up signal.

[0138] ○ the UE determining associated time-frequency LO resource index (ID) or resource position according to the subgroup set index, and the subgroup set index may correspond to the time-frequency LO resource index (ID) one by one according to an ascending order of numbers, for example, subgroup set index 1 corresponds to time-frequency LO resource index 1, subgroup set index 2 corresponds to time-frequency LO resource index 2, and so on. The time-frequency LO resource index may be index (ID) associated by a way of first the time domain LO resource and then the frequency domain LO resource or first the frequency domain LO resource and then the time domain LO resource; or the subgroup set index may correspond to the time-frequency LO resource position one by one according to a mapping order of first the time domain LO resource and then the frequency domain LO resource or first the frequency domain LO resource and then the time domain LO resource. For example, subgroup set index 1 corresponds to a time-frequency LO resource that is the first in time domain and the first in frequency domain, subgroup set index 2 corresponds to a time-frequency LO resource that is the first in time domain and the second in frequency domain. When there are d time-frequency LO resources in frequency domain, subgroup set index d+1 corresponds to a time-frequency LO resource that is the second in time domain and the first in frequency domain, and so on, as shown in FIG. 10; for another example, subgroup set index 1 corresponds to a time-frequency LO resource that is the first in time domain and the first in frequency domain, and subgroup set index 2 corresponds to a time-frequency LO resource that is the second in time domain and the first in frequency domain. When there are v time-frequency LO resources in time domain, subgroup set index v+1 corresponds to a time-frequency LO resource that is the first in time domain and the second in frequency domain, and so on.

[0139] ○ the subgroup set index being implied by a generated sequence of an overlaid OFDM sequence and / or a time domain OOK ON-OFF sequence of the wake up signal, for example, CRC and / or generated bits of the overlaid OFDM sequence and / or CRC and / or generated bits of the time domain OOK ON-OFF sequence of the wake up signal scrambled using the subgroup set index. If the UE blindly detects the generated sequence of the overlaid OFDM sequence and / or the time domain OOK ON-OFF sequence of the wake up signal carrying the subgroup set index and the carried subgroup set index is the same as a subgroup set index where the UE is located, the UE demodulates the information bits carried by the wake up signal to determine whether to wake up to monitor the PO associated with the wake up signal.

[0140] ○ predefining an association relationship of the generated sequence of the overlaid OFDM sequence and / or the time domain OOK ON-OFF sequence of the wake up signal and the subgroup set index. Each generated sequence of the overlaid OFDM sequence and / or the time domain OOK ON-OFF sequence of the wake up signal corresponds to a determined subgroup set index. If the UE blindly detects the generated sequence of the overlaid OFDM sequence and / or the time domain OOK ON-OFF sequence of the wake up signal corresponding to the subgroup set index where the UE is located, the UE demodulates the information bits carried by the wake up signal to determine whether to wake up to monitor the PO associated with the wake up signal.

[0141] ○ Optionally, in order to reduce the wake-up delay, the subgroup set index may be first mapped to the time domain LO resources, and then mapped to different code domain resources of the wake up signal. The UE determines time code LO resource index (ID) or resource position and / or codepoint (or sequence) according to the subgroup set index, and the subgroup set index may correspond to the time code LO resource index (ID) one by one according to an ascending order of numbers, first in time domain and then in code domain. For example, subgroup set index 1 corresponds to time domain LO resource index 1, subgroup set index 2 corresponds to time domain LO resource index 2, and so on, and after the time domain LO resource index mapping is completed, an association relationship with the subgroup set index is established in order from the first time domain LO resource using codepoint (sequence) resource ID; or the subgroup set index may correspond to the time domain LO resource position and codepoint (or sequence) one by one according to a mapping order of first the time domain LO resource and then the codepoint (sequence). For example, subgroup set index 1 corresponds to the first time domain LO resource in time domain and the wake up signal is transmitted using the first code domain resource, subgroup set index 2 corresponds to the second time domain LO resource in time domain and the wake up signal is transmitted using the first code domain resource, and so on. When there are g time-frequency LO resources in time domain, subgroup set index g+1 corresponds to the first time domain LO resource in time domain and the wake up signal is transmitted using the second code domain resource, and so on, as shown in FIG. 11.

[0142] ○ Optionally, since the frequency domain resources of more than one wake up signals are limited in frequency division multiplexing, the subgroup set index may be first mapped to the frequency domain LO resources. In order to reduce the wake-up delay, the subgroup set index may be remapped to the time domain resource. Considering that one wake up signal has two sequences, that is, the generated sequence of the overlaid OFDM sequence and / or the time domain OOK ON-OFF sequence of the wake up signal, the subgroup set index may be finally mapped to the code domain resource. The UE determines the time-frequency code LO resource index (ID) or resource position and / or codepoint (or sequence) according to the subgroup set index, and the subgroup set index may correspond to the time-frequency code LO resource index (ID) may be arranged according to an ascending order of numbers. First frequency domain then time domain and last code domain correspond one by one, for example, subgroup set index 1 corresponds to time-frequency LO resource index 1, subgroup set index 2 corresponds to time-frequency LO resource index 2, where time-frequency LO resource index 1 and 2 can be on the same time unit, and so on, after the frequency domain LO resource index mapping configured in the same time unit is completed. The time-frequency LO resource on the subsequent time unit is mapped according to the mapping rule of the subgroup set index and the time-frequency code LO resource index (ID). When the time-frequency resource mapping of the LO is completed, the association relationship with the subgroup set index is established through the code domain LO resource. Or the subgroup set index and the time-frequency LO resource position and codepoint (or sequence) can correspond one by one according to the mapping order of the frequency domain LO resource first and then the time domain LO resource, and then correspond one by one to the codepoint (or sequence). For example, subgroup set index 1 corresponds to the first time-frequency LO resource in time domain, and the first code domain resource is used to transmit the wake up signal. When there are d time-frequency LO resources in frequency domain, subgroup set index d+1 corresponds to the second time-frequency LO resource in time domain and the wake up signal is transmitted using the first code domain resource. When the time-frequency resource mapping of the LO is completed, subgroup set index g * d+1 corresponds to a time-frequency LO resource that is the first in time domain and the first in frequency domain and the 2nd code domain resource, and so on, as shown in FIG. 12.

[0143] In an embodiment, since the association relationship between the time domain and / or code domain and / or frequency domain resources of the PO and the subgroup set and the LO has been established, the time gap between the end position of the LO monitored by the UE and the start position of the associated PO according to the network configuration is greater than or equal to or not less than the wake-up time and / or synchronization time of the MR. If the time gap between the end position of the LO monitored by the UE and the start position of the associated PO is less than the wake-up time and / or synchronization time of the MR, the UE can monitor the same in the next DRX cycle of the current DRX cycle where the associated PO is located. Position PO, or the UE does not expect to monitor the associated LO in RRC connected state and / or the UE does not feed back a message to the network that the wake up signal reception is successful or MR wake-up is successful.

[0144] In an embodiment, the offset may be determined by multiples of absolute time units, such as multiples of 1 millisecond, 1 second, etc., or by relative time units, such as the number of time units.

[0145] In an embodiment, the offset can be configured to be two different values at FR1 and FR2.

[0146] In the disclosure, each of the above-described embodiments may be implemented alone or in combination with one or more other embodiments.

[0147] FIG. 13 is a block diagram of a user equipment (UE) 1300 according to an embodiment of the disclosure.

[0148] Referring to FIG. 13, the UE 1300 according to an embodiment of the disclosure may include a transceiver 1301 and a controller 1302. For example, the transceiver 1301 may be configured to transmit and receive signals. For example, the controller 1302 may be coupled to the transceiver 1301 and configured to perform the aforementioned methods.

[0149] FIG. 14 is a block diagram of a base station 1400 according to an embodiment of the disclosure.

[0150] Referring to FIG. 14, the base station 1400 according to an embodiment of the disclosure may include a transceiver 1401 and a controller 1402. For example, the transceiver 1401 may be configured to transmit and receive signals. For example, the controller 1402 may be coupled to the transceiver 1401 and configured to perform the aforementioned methods.

[0151] Those skilled in the art will understand that the above illustrative embodiments are described herein and are not intended to be limiting. It should be understood that any two or more of the embodiments disclosed herein may be combined in any combination. Furthermore, other embodiments may be utilized and other changes may be made without departing from the spirit and scope of the subject matter presented herein. It will be readily understood that aspects of the invention of the disclosure as generally described herein and shown in the drawings may be arranged, replaced, combined, separated and designed in various different configurations, all of which are contemplated herein.

[0152] Those skilled in the art will understand that the various illustrative logical blocks, modules, circuits, and steps described in the disclosure may be implemented as hardware, software, or a combination of both. To clearly illustrate this interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above in the form of their functional sets. Whether such function sets are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Technicians may implement the described functional sets in different ways for each specific application, but such design decisions should not be interpreted as causing a departure from the scope of the disclosure.

[0153] The various illustrative logic blocks, modules, and circuits described in the disclosure may be implemented or performed by a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic devices, discrete gates or transistor logics, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, more than one microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration.

[0154] The steps of the method or algorithm described in the disclosure may be embodied directly in hardware, in a software module executed by a processor, or in a combination thereof. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, register, hard disk, removable disk, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor to enable the processor to read and write information from / to the storage media. In an alternative, the storage medium may be integrated into the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and the storage medium may reside in the user terminal as discrete components.

[0155] In one or more exemplary designs, the functions may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, each function may be stored as one or more pieces of instructions or codes on a computer-readable medium or delivered through it. The computer-readable medium includes both a computer storage medium and a communication medium, the latter including any medium that facilitates the transfer of computer programs from one place to another. The storage medium may be any available medium that can be accessed by a general purpose or special purpose computer.

[0156] The above description is only an exemplary implementation of the disclosure, and is not intended to limit the scope of protection of the disclosure, which is determined by the appended claims.

Claims

1.A method performed by a user equipment (UE) in a wireless communication system, the method comprising:receiving first configuration information related to a first signal for wake up, wherein the first configuration information comprises information related to resources for the first signal that are associated with a UE subgroup set index associated with more than one UE subgroup index;receiving or monitoring the first signal based on the information related to the resources for the first signal; anddetermining, based on information bits of the first signal and a UE subgroup index associated with the UE, whether to monitor a paging occasion (PO),wherein a number of UE subgroups in a UE subgroup set is associated with a number of the information bits of the first signal.2.The method of claim 1, wherein the first configuration information further comprises:information related to the number of the information bits of the first signal; orinformation related to the number of the UE subgroups in the UE subgroup set.3.The method of claim 1, wherein the UE subgroup set is associated with one paging occasion, andwherein each UE subgroup set index associated with the paging occasion and a UE subgroup index associated with each UE subgroup set index are determined based on a UE subgroup index associated with the paging occasion and the number of the UE subgroups in the UE subgroup set.4.The method of claim 3, wherein each UE subgroup set index associated with the paging occasion and the UE subgroup index associated with each UE subgroup set index are determined by the UE subgroup index associated with the paging occasion modulo the number of the UE subgroups in the UE subgroup set, and / orwherein each UE subgroup set index associated with the paging occasion and the UE subgroup index associated with each UE subgroup set index are determined by rounding a result of dividing the UE subgroup index associated with the paging occasion by the number of the UE subgroups in the UE subgroup set.5.The method of claim 1, wherein receiving or monitoring the first signal based on the information related to the resources for the first signal comprises:determining, based on a UE subgroup set index associated with the UE, a resource among the resources for the first signal that is associated with the UE subgroup set index associated with the UE; andreceiving or monitoring the first signal on the determined resource.6.The method of claim 5, wherein:the UE subgroup set index associated with the UE is associated with a time domain resource index for the first signal, and / orthe UE subgroup set index associated with the UE is associated with a time-frequency resource index for the first signal, and / orthe UE subgroup set index associated with the UE is associated with a time code resource index for the first signal based on an order of first a time domain resource and then a code domain resource, and / orthe UE subgroup set index associated with the UE is associated with a time-frequency code resource index for the first signal based on an order of first a frequency domain resource, then a time domain resource and then a code domain resource, and / orthe UE subgroup set index associated with the UE is associated with a generated sequence of an overlaid orthogonal frequency division multiplexing (OFDM) sequence and / or a time domain on-off keying (OOK) ON-OFF sequence of the first signal.7.The method of claim 1, further comprising:receiving third information related to a resource monitoring window for the first signal,wherein receiving or monitoring the first signal based on the information related to the resources for the first signal comprises:determining, based on the third information and a UE subgroup set index associated with the UE, a resource among the resources for the first signal that is associated with the UE subgroup set index associated with the UE;receiving or monitoring the first signal on the determined resource.8.The method of claim 7, wherein the third information comprises at least one of:a period of the resource monitoring window for the first signal;a start position and / or an end position of the resource monitoring window for the first signal; ora duration of the resource monitoring window for the first signal.9.The method of claim 1, further comprising:receiving fourth information related to the resources for the first signal,wherein receiving or monitoring the first signal based on the information related to the resources for the first signal comprises:determining, based on the fourth information and a UE subgroup set index associated with the UE, a resource among the resources for the first signal that is associated with the UE subgroup set index associated with the UE; andreceiving or monitoring the first signal on the determined resource.10.The method of claim 9, wherein the fourth information comprises at least one of:a start position and / or an end position of one or more resources for the first signal;a start position and / or an end position of a first resource for the first signal among more than one resources for the first signal;a start position and / or an end position of a last resource for the first signal among the more than one resources for the first signal;a duration of a resource for the first signal; anda time gap between two adjacent resources for the first signal.11.A method performed by a base station in a wireless communication system, the method comprising:transmitting first configuration information related to a first signal for wake up, wherein the first configuration information comprises information related to resources for the first signal that are associated with a user equipment (UE) subgroup set index associated with more than one UE subgroup index; andtransmitting the first signal based on the information related to the resources for the first signal,wherein information bits of the first signal and a UE subgroup index associated with the UE are used to determine whether to monitor a paging occasion (PO), andwherein a number of UE subgroups in a UE subgroup set is associated with a number of the information bits of the first signal.12.The method of claim 11, wherein the first configuration information further comprises:information related to the number of the information bits of the first signal; orinformation related to the number of the UE subgroups in the UE subgroup set.13.The method of claim 11, wherein the UE subgroup set is associated with one paging occasion, andwherein each UE subgroup set index associated with the paging occasion and a UE subgroup index associated with each UE subgroup set index are determined based on a UE subgroup index associated with the paging occasion and the number of the UE subgroups in the UE subgroup set.14.A user equipment (UE) in a wireless communication system, comprising:a transceiver; anda controller coupled with the transceiver and configured to perform the method of any one of claims 1-10.15.A base station in a wireless communication system, comprising:a transceiver; anda controller coupled with the transceiver and configured to perform the method of any of claims 11-13.

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