Method and apparatus for system information (SI) change notification on unlicensed carriers

Abstract

Provided is a communication method and system for merging a fifth generation (5G) communication system for supporting a higher data rate beyond a fourth generation (4G) system with a technology for the Internet of Things (IoT). The communication method and system include smart services based on 5G communication technology and IoT-related technologies, such as smart homes, smart buildings, smart cities, smart cars, connected cars, healthcare, digital education, smart retail, security, and safety services.

Description

Technical Field

[0001] The present disclosure relates to systems and methods for system information (SI) change notification on an unlicensed carrier. Background Art

[0002] In order to meet the demand for wireless data services that has increased since the deployment of the fourth generation (4G) communication system, efforts have been made to develop improved fifth generation (5G) or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "super 4G networks" or "post-long term evolution (LTE) systems". The 5G wireless communication system is considered to be implemented not only in lower frequency bands, but also in higher frequency bands (mmWave), such as 10 GHz to 100 GHz frequency bands, thereby achieving higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input and multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming and massive antenna technology are considered in the design of 5G wireless communication systems. In addition, in the 5G communication system, based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), receiving end interference elimination, etc., the development of system network improvements is underway. In the 5G system, frequency quadrature amplitude modulation (FQAM), which is a combination of hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM), sliding window superposition coding (SWSC) as advanced coding modulation (ACM), filter bank multi-carrier (FBMC) as advanced access technology, non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) have also been developed.

[0003] In a similar aspect, the Internet, as a human-centric connectivity network where humans generate and consume information, is now evolving into the Internet of Things (IoT), in which distributed entities such as objects exchange and process information without human intervention. The Internet of Everything (IoE), which is a combination of IoT technology and big data processing technology through connection with cloud servers, has also emerged. Since technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology" and "security technology" are already required for IoT implementation, sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. have been studied recently. This IoT environment can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated between connected objects. In this case, IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or interconnected cars, smart grids, health care, smart instruments and advanced medical services, through the aggregation and combination between existing information technology (IT) and various industrial applications.

[0004] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, MTC, and M2M communications can be implemented through beamforming, MIMO, and array antennas. It can also be considered that the application of cloud RAN, which is the above-mentioned big data processing technology, is an example of the aggregation between 5G technology and IoT technology.

[0005] In recent years, several broadband wireless technologies have been developed to meet the increasing number of broadband users and to provide more and better applications and services such as these. The second generation (2G) wireless communication system has been developed to provide voice services while ensuring the mobility of users. The third generation (3G) wireless communication system supports voice services and data services. The fourth generation wireless communication system has been developed to provide high-speed data services. However, the fourth generation wireless communication system is currently subject to the lack of resources to meet the demand for growing high-speed data services. Therefore, the 5G wireless communication system is being developed to meet the growing demand for various services with various requirements, such as high-speed data services, support for ultra-reliability and low-latency applications.

[0006] Additionally, the 5G wireless communication system is expected to address different use cases with completely different requirements in terms of data rate, latency, reliability, mobility, etc. However, the air interface design of the 5G wireless communication system is expected to be flexible enough to serve user equipment (UE) with completely different capabilities depending on the use case and market segment that the UE serves for the end customer. Example use cases that the 5G wireless communication system is expected to address include enhanced mobile broadband (eMBB), massive machine type communication (m-MTC), ultra-reliable low latency communication (URLL), etc. The eMBB requirements (e.g., tens of Gbps data rates, low latency, high mobility, etc.) address the market segment representing wireless broadband users who need to achieve Internet connectivity anytime and anywhere. The m-MTC requirements (e.g., very high connection density, infrequent data transmission, very long battery life, low mobility address, etc.) address the market segment representing IoT / IoE that envisions connectivity of billions of devices. The URLL requirements (e.g., very low latency, very high reliability, variable mobility, etc.) address the market segment representing industrial automation applications and vehicle-to-vehicle / vehicle-to-infrastructure communications, which is foreseen to be one of the enablers of autonomous vehicles.

[0007] In a wireless communication system, the next generation Node B (gNB) or base station in a cell broadcasts SI. This SI includes common parameters required for communication in the cell. In a 5G wireless communication system (also known as Next Generation Radio or NR), SI is divided into a master information block (MIB) and multiple SI blocks (SIBs).

[0008] The MIB may be sent on a broadcast channel (BCH) with a periodicity of 80 ms and repeated within 80 ms. The MIB includes the parameters required to obtain SIB1 from the cell.

[0009] SIB1 can be sent on the downlink shared channel (DL-SCH) with a periodicity of 160ms and a variable transmission repetition. The default transmission repetition periodicity of SIB1 is 20ms, but the actual transmission repetition periodicity depends on the network implementation. SIB1 includes information about the availability and scheduling of other SIBs (e.g., mapping of SIBs to SI messages, periodicity, SI window size), with an indication of whether one or more SIBs are provided only on demand, and in this case, needs to be configured by the UE to perform the SI request. SIB1 is a cell-specific SIB.

[0010] The SI message carries SIBs other than SIB1, which are sent on the DL-SCH. Only SIBs with the same periodicity can be mapped to the same SI message. Each SI message is sent within a time domain window that occurs periodically (called an SI window with the same length for all SI messages). Each SI message is associated with an SI window, and the SI windows of different SI messages do not overlap. That is, within an SI window, only the corresponding SI message is sent. In the SI window, the UE monitors the physical downlink control channel (PDCCH) in the monitoring opportunity (i.e., symbol / time slot) configured for SI message reception. For SI message acquisition, (multiple) PDCCH monitoring opportunities are determined according to osi-searchSpace. If osi-searchSpace is set to zero (also called the default association), the PDCCH monitoring opportunity for SI message reception in the SI-Window is the same as the PDCCH monitoring opportunity for SIB1. If osi-searchSpace is not set to zero (also called the non-default association), the PDCCH monitoring opportunity for the SI message is determined based on the search space indicated by osi-searchSpace. In the frequency domain, the bandwidth (or control resource set (CORESET)) used for SI message reception is located in the initial downlink bandwidth part (DL BWP).

[0011] The SI broadcast in the cell can be updated. In order to update the SI, a modification period is used. When a modification period is used, the updated SI (except for the SI used for the Earthquake and Tsunami Warning System (ETWS) and the Commercial Mobile Alert System (CMAS)) is broadcast in the modification period after the SI change indication. If the gNB sends an SI change indication in modification period N, the updated SI is broadcast from modification period N+1. The modification period boundary is defined by the system frame number (SFN) value of SFN mod m=0, where m is the number of radio frames including the modification period. The modification period is configured by the SI. The UE receives indications about SI modifications and / or public warning system (PWS) notifications using a short message sent on the downlink control information (DCI) together with the paging radio network temporary identifier (P-RNTI). The SI change indication and / or PWS notification can be repeated multiple times within a modification period. Each modification period includes multiple default discontinuous reception (DRX) cycles. The SI change indication and / or the PWS notification is sent in each paging occasion (PO) of the default DRX cycle so that each UE can receive the SI change indication and / or the PWS notification.

[0012] In every DRX cycle, a UE in RRC_IDLE or RRC_INACTIVE monitors its PO for SI change indications. If the UE is provided with a common search space to monitor paging, a UE in RRC_CONNECTED monitors any PO for SI change indications at least once per modification period. In every DRX cycle, a UE with ETWS or CMAS capability in RRC_IDLE or RRC_INACTIVE monitors its PO for indications about PWS notifications. If the UE is provided with a common search space to monitor paging, a UE with ETWS or CMAS capability in RRC_CONNECTED monitors any PO for indications about PWS notifications at least once per modification period.

[0013] question:

[0014] In the case of unlicensed spectrum, before sending SI change indication or PWS notification in the modification period, the gNB needs to determine whether the channel is idle. If the channel is not idle, the gNB cannot send SI change indication. Therefore, SI change indication may not be sent in every PO of the default DRX cycle.

[0015] Figure 1 An example is shown in which an SI change indication is not sent in the second PO (ie, PO2) of a DRX cycle due to Listen Before Send (LBT) failure according to the prior art.

[0016] Therefore, a UE that is monitoring PO2 will not receive the SI change indication.

[0017] Therefore, a method for enhanced SI change indication and / or PWS notification is needed.

[0018] The above information is presented as background information only and is helpful for understanding the present disclosure. No determination has been made and no assertion is made as to whether any of the above may be used as prior art with respect to the present disclosure. Summary of the invention

[0019] Technical issues

[0020] Aspects of the present disclosure will at least solve the above-mentioned problems and / or disadvantages and provide at least the following advantages. Therefore, one aspect of the present disclosure is to provide a communication method and system for integrating a communication method and system of a fifth generation (5G) communication system to support a fifth generation (5G) communication system with a higher data rate than a fourth generation (4G) system.

[0021] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments.

[0022] In the case of unlicensed spectrum, a next generation Node B (gNB) needs to determine whether a channel is idle before sending a system information (SI) change indication or a public warning system (PWS) notification in a modification period. If the channel is not idle, the gNB cannot send the SI change indication. Therefore, the SI change indication may not be sent in every paging occasion (PO) of the default discontinuous reception (DRX) cycle. As a result, some (multiple) user equipments ((multiple) UEs) may not receive the SI change indication, and the SI used by the UE and the gNB will be different, which affects the communication between the UE and the gNB. Therefore, a method for enhanced SI change indication and / or PWS notification is needed.

[0023] Solution to the problem

[0024] According to the current paging design, the number (N) of paging frames (PF) in a DRX cycle may be configurable. The gNB may select any value from {T, T / 2, T / 4, T / 8, and T / 16}. The problem is that when the gNB wants to send a physical downlink control channel (PDCCH) for paging while also sending a PDCCH for system information block 1 (SIB1) (or remaining minimum system information (RMSI)), selecting any value from {T, T / 2, T / 4, T / 8, and T / 16} will be inefficient. The PF may not be aligned with the radio frame where the PDCCH for SIB1 (or RMSI) is sent, and therefore, an efficient method for selecting the value of N is needed.

[0025] According to one aspect of the present disclosure, a method for sending a paging message performed by a base station is provided. The method includes: determining the number of paging frames (PFs) in a discontinuous reception (DRX) cycle based on information about a paging search space, sending information about the number of PFs to a terminal in a system information block 1 (SIB1), identifying at least one PF based on the number of PFs, and sending at least one paging message in at least one PF to the terminal.

[0026] According to another aspect of the present disclosure, a base station in a wireless communication system is provided. The base station includes a transceiver and at least one processor. The at least one processor is configured to determine the number of paging frames (PFs) in a discontinuous reception (DRX) cycle based on information about a paging search space, send information about the number of PFs to a terminal in a system information block 1 (SIB1) via the transceiver, identify at least one PF based on the number of PFs, and send at least one paging message in at least one PF to the terminal via the transceiver.

[0027] According to another aspect of the present disclosure, a method for receiving a paging message performed by a terminal is provided. The method includes: receiving information about the number of paging frames (PFs) in a discontinuous reception (DRX) cycle from a base station in a system information block 1 (SIB1), identifying at least one PF based on the number of PFs, and receiving at least one paging message in the at least one PF from the base station. The number of PFs is identified based on information about a paging search space.

[0028] According to another aspect of the present disclosure, a terminal in a wireless communication system is provided. The terminal includes a transceiver and at least one processor. The at least one processor is configured to receive information about the number of paging frames (PFs) in a discontinuous reception (DRX) cycle from a base station in a system information block 1 (SIB1) via the transceiver, identify at least one PF based on the number of PFs, and receive at least one paging message in at least one PF from the base station via the transceiver. The number of PFs is identified based on information about a paging search space.

[0029] Advantageous Effects of the Invention

[0030] In the case of unlicensed spectrum, a mechanism has been provided in the present disclosure so that the UE does not miss the SI change indication and / or PWS notification. A mechanism for selecting the number (multiple) of PFs (N) to be configured in the paging configuration has also been provided in the present disclosure so that the PF can be aligned with the frame in which SIB1 (or RMSI) is sent.

[0031] Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description (in conjunction with the accompanying drawings) which discloses various embodiments of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0033] Figure 1 An example of not sending a system information (SI) change indication in a paging occasion (PO) due to a listen before send (LBT) failure according to the prior art is shown;

[0034] Figure 2 A next generation Node B (gNB) is shown that sends an SI change indication in one or more modification periods according to an embodiment of the present disclosure;

[0035] Figure 3 An example of a gNB initiating transmission of an SI change indication in a modification period N according to an embodiment of the present disclosure is shown;

[0036] Figure 4A gNB is shown sending an SI change indication in one or more modification periods together with a RETX COUNT according to an embodiment of the present disclosure.

[0037] Figure 5 is an exemplary diagram of sending an SI change indication together with a RETX COUNT according to an embodiment of the present disclosure;

[0038] Figure 6 A flow chart for sending SI change indications in one or more modification cycles together with RETX COUNT according to an embodiment of the present disclosure is shown;

[0039] Figure 7 A flow chart for sending SI change indications in multiple modification cycles together with RETX COUNT according to an embodiment of the present disclosure is shown.

[0040] Figure 8 A flow chart for receiving an SI change indication together with a RETX COUNT and updating SI according to an embodiment of the present disclosure is shown.

[0041] Fig. 9 A flow chart for receiving an SI change indication together with a RETX COUNT and updating SI according to an embodiment of the present disclosure is shown.

[0042] Fig.10 An example according to an embodiment of the present disclosure is shown, in which the gNB fails to send an SI change indication in PO2 of a default discontinuous reception (DRX) cycle even after attempting transmission in multiple modification cycles.

[0043] Fig.11 An example of a public area according to an embodiment of the present disclosure is shown;

[0044] Fig.12 Another example of a public area according to an embodiment of the present disclosure is shown;

[0045] Fig.13 The gNB operation according to an embodiment of the present disclosure is shown, and the gNB operation is used to select the total number of PFs in the SI change indication in the DRX cycle of the terminal;

[0046] Fig.14 is a block diagram of a base station according to an embodiment of the present disclosure; and

[0047] Fig.15 is a block diagram of a terminal according to an embodiment of the present disclosure.

[0048] Throughout the drawings, like reference numerals will be understood to refer to like parts, components, and structures.

[0049] Mode for the Invention

[0050] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in understanding, but these details are considered to be exemplary only. Therefore, it will be appreciated by those of ordinary skill in the art that various changes and modifications may be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and configurations may be omitted for clarity and brevity.

[0051] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used to enable a clear and consistent understanding of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0052] It should 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.

[0053] The term "substantially" means that the recited characteristic, parameter or value need not be achieved precisely, but deviations or variations (including, for example, tolerances, measurement errors, measurement precision limits and other factors known to those skilled in the art) may occur in amounts that do not eliminate the effect that the characteristic is intended to provide.

[0054] Those skilled in the art know that the combination of the blocks of the flowchart (or sequence diagram) and the flowchart can be represented and executed by computer program instructions. These computer program instructions can be loaded on a processor of a general-purpose computer, a special-purpose computer, or a programmable data processing device. When the loaded program instructions are executed by the processor, they create a tool for performing the functions described in the flowchart. Because the computer program instructions can be stored in a computer-readable memory available in a special-purpose computer or a programmable data processing device, it is also possible to create an article that performs the functions described in the flowchart. Because the computer program instructions can be loaded on a computer or a programmable data processing device, when executed as a process, they can perform the operations of the functions described in the flowchart.

[0055] The blocks of the flowchart may correspond to a module, segment, or code containing one or more executable instructions that implement one or more logical functions, or may correspond to a portion thereof. In some cases, the functions described by the blocks may be performed in an order different from the order listed. For example, two blocks listed in sequence may be executed simultaneously or in reverse order.

[0056] In this specification, the words "unit", "module", etc. may refer to software components or hardware components, such as field programmable gate arrays (FPGAs) or application specific integrated circuits (ASICs) that can perform functions or operations. However, "units", etc. are not limited to hardware or software. Units, etc. may be configured to reside in an addressable storage medium or drive one or more processors. Units, etc. may also refer to software components, object-oriented software components, class components, task components, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays, or variables. The functions provided by components and units may be combinations of smaller components and units, and may be combined with others to form larger components and units. Components and units may be configured to drive devices or one or more processors in a secure multimedia card.

[0057] Before the detailed description, terms or definitions necessary for understanding the present disclosure are described. However, these terms should be interpreted in a non-limiting manner.

[0058] A base station (BS) is an entity that communicates with a user equipment (UE) and may be referred to as a BS, base transceiver station (BTS), node B (NB), evolved NB (eNB), access point (AP), fifth generation (5G) NB (5GNB) or next generation NB (gNB).

[0059] The UE is an entity communicating with the BS and may be referred to as a UE, a device, a mobile station (MS), a mobile equipment (ME), or a terminal.

[0060] 1. Notification of changes to System Information (SI) in Unlicensed New Radio (NR-U)

[0061] Method 1:

[0062] In one method of the present disclosure, it is proposed that the SI change indication can be sent by the gNB in ​​multiple modification cycles.

[0063] Figure 2 It is shown that the gNB sends SI change indication in one or more modification periods according to an embodiment of the present disclosure.

[0064] refer to Figure 2, when initiating transmission of SI change indication in a modification cycle, the gNB may continue to send SI change indication in subsequent modification cycles until the SI change indication has been sent at least once in each paging opportunity (PO) of the default discontinuous reception (DRX) cycle. For example, at operation 210, when initiating transmission of SI change indication in modification cycle N, at operation 220, the gNB determines whether to send SI change indication at least once in each PO of the default DRX cycle. If the gNB fails to send SI change indication at least once in each PO of the default DRX cycle before the end of modification cycle N, the gNB attempts SI change indication transmission in the next modification cycle, that is, at operation 230, the gNB sends SI change indication in modification cycle N+1. If the gNB still fails to send SI change indication at least once in each PO of the default DRX cycle before the end of modification cycle N+1, the gNB sends SI change indication in modification cycle N+2, and so on. If the gNB has sent SI change indication at least once in each PO of the default DRX cycle, at operation 240, the gNB stops sending SI change indication.

[0065] Figure 3 An example of a gNB initiating transmission of an SI change indication in modification period N according to an embodiment of the present disclosure is shown.

[0066] refer to Figure 3 , modification cycle N includes two default DRX cycles, each of which has two POs. The gNB should send SI change indication at least once in each PO, i.e., PO1 and PO2. PO1 and PO2 appear twice in the modification cycle, and the gNB can send SI change indication every time PO1 and PO2 appear to achieve reliable delivery. In the modification cycle, the gNB is able to send SI change indication at least once in PO1, but because the channel is unavailable when PO2 occurs, it is impossible to send SI change indication in PO2. Therefore, the gNB continues SI change indication transmission in modification cycle N+1. In modification cycle N+1, the gNB can still try to send SI change indication only in PO2, or try to send SI change indication in both PO1 and PO2 even if the gNB has already sent SI change indication in PO1 in modification cycle N. Reference Figure 3 , the gNB has sent the SI change indication in PO2 in modification period N+1. At the end of modification period N+1, the gNB has sent the SI change indication at least once in each PO (i.e., PO1 and PO2) since the gNB started SI change indication transmission, so the gNB does not need to continue SI change indication transmission in modification period N+2.

[0067] Figure 4It is shown that the gNB sends SI change indication together with RETX COUNT in one or more modification periods according to an embodiment of the present disclosure.

[0068] refer to Figure 4 Regardless of whether the gNB has sent the SI change indication at least once in each PO of the default DRX cycle, the gNB shall send the SI change indication in multiple modification cycles.

[0069] In the existing system, the SI change indication is a one-bit indication included in the downlink control information (DCI) of the physical downlink control channel (PDCCH) addressed to the paging radio network temporary identifier (P-RNTI). A short message including the SI change indication is sent in the DCI of the PDCCH addressed to the P-RNTI. The UE monitors the PDCCH addressed to the P-RNTI in the PO. The SI change indication bit set to 1 notifies the UE of the SI change notification. The UE receives the updated SI in the next modification period. Even if the UE receives the SI change indication multiple times during the modification period, there is no problem because the UE obtains the updated SI from the next modification period. However, because the SI change indication can be sent in multiple modification periods, UEs that have received the SI change indication in modification period N can also receive the SI change in modification period N+1. These UEs will first read the master information block (MIB) and SI block (SIB) (such as SIB1) in modification period N+1, and then read again in modification period N+2 unnecessarily. In order to overcome this problem, additional information can be included with the SI change indication. The additional information indicates that the SI change indication in this modification period is a repetition of the SI change indication sent in the previous modification period.

[0070] In one embodiment of the present disclosure, the additional information may be a retransmission counter and is defined as a new parameter RETX COUNT. In the first modification cycle of sending the SI change indication, RETX COUNT is set to 0 or may be skipped. In the second modification cycle of resending the SI change indication, RETX COUNT is set to 1. In the third modification cycle of resending the SI change indication, RETX COUNT is set to 2, and so on.

[0071] refer to Figure 4, at operation 410, upon initiating transmission of an SI change indication in modification cycle N, at operation 420, the gNB sets RETX COUNT to zero. At operation 430, the gNB determines whether RETX COUNT is equal to a maximum value (i.e., MAX RETXCOUNT). If RETX COUNT is less than MAX RETX COUNT, the gNB attempts SI change indication transmission in the next modification cycle, i.e., at operation 440, the gNB sends an SI change indication in modification cycle N+1. After sending the SI change indication, at operation 450, the gNB increases RETX COUNT by 1. If RETX COUNT is equal to MAX RETX COUNT, at operation 460, the gNB stops sending SI change indications.

[0072] Note that the SI Change Indication may be sent multiple times within a modification period and the RETX COUNT remains the same for all these transmissions.

[0073] Figure 5 is an exemplary diagram of sending an SI change indication together with a RETX COUNT according to an embodiment of the present disclosure.

[0074] refer to Figure 5 , in the first modification cycle N, the gNB sends SI change indication in PO1 of each default DRX cycle, but fails to send SI change indication in PO2. Therefore, the gNB continues SI change indication transmission in the next modification cycle N+1, where RETX COUNT is set to 1.

[0075] Figure 6 A flow chart for sending SI change indication in one or more modification cycles together with RETX COUNT according to an embodiment of the present disclosure is shown.

[0076] refer to Figure 6, at operation 610, the gNB initiates transmission of an SI change indication in the modification period. At operation 620, the RETX COUNT is set to zero. At operation 630, the gNB includes the RETX COUNT sent in the modification period together with the SI change indication. At operation 640, the gNB determines whether the SI change indication is sent at least once in each PO of the default DRX cycle. Before the end of the modification period, if the SI change indication is not sent at least once in each PO of the default DRX cycle, the gNB increases the RETX COUNT by 1 and attempts SI change indication transmission in the next modification period, that is, at operation 650, the gNB sends the SI change indication in the next modification period. The RETX COUNT is sent together with the SI change indication. If the SI change indication has been sent at least once in each PO of the default DRX cycle, at operation 660, the gNB stops sending the SI change indication.

[0077] Figure 7 A flow chart for sending SI change indications in multiple modification cycles together with RETX COUNT according to an embodiment of the present disclosure is shown.

[0078] refer to Figure 7 At operation 710, the gNB initiates transmission of an SI change indication in a modification period. At operation 720, RETX COUNT is set to zero. At operation 730, the gNB includes the RETX COUNT sent in the modification period together with the SI change indication. At operation 740, the gNB determines whether the RETX COUNT is equal to the MAX RETX COUNT. If the RETX COUNT is less than the MAX RETX COUNT, the gNB attempts SI change indication transmission in the next modification period, i.e., at operation 750, the gNB sends the SI change indication in the next modification period and increases the RETX COUNT after each modification period. The RETX COUNT is sent together with the SI change indication. At operation 760, if the RETX COUNT is equal to the MAX RETX COUNT, the gNB stops sending the SI change indication.

[0079] refer to Figure 6 and Figure 7 Instead of RETX COUNT, a transmission (TX) COUNT may be used. TX COUNT may be set to zero for the modification period in which the SI change indication is initiated, and then increased by one for each subsequent modification period in which SI change indication transmission is attempted.

[0080] exist Figures 2 to 7 The above embodiments explained in can also be used to deliver Public Warning System (PWS) notifications.

[0081] Embodiment 1:

[0082] Figure 8 A flow chart for receiving an SI change indication together with a RETX COUNT and updating SI according to an embodiment of the present disclosure is shown.

[0083] refer to Figure 8 , at operation 810, the UE receives an SI change indication in a modification period. At operation 820, the UE determines whether RETX COUNT is zero or is received together with an SI change indication. If RETX COUNT is zero or is not received together with an SI change indication, the UE obtains updated SI in the next modification period. At operation 821, if the UE is in a radio resource control (RRC) idle / inactive state in the next modification period, the UE obtains the MIB. At operation 822, the UE obtains SIB1 in the next modification period, or reads SIB1. The UE reads the value tag in SIB1 and determines which SIBs are updated. At operation 823, the UE obtains updated SIBs in the next modification period.

[0084] At operation 830, if RETX COUNT is equal to X (where X>0), that is, RETX COUNT exists and is not zero, the UE determines whether the UE has received an SI change indication in any of the previous X modification cycles (multiple). If the UE has received an SI change indication in any of the previous X modification cycles, then at operation 831, the UE ignores the SI change indication. If the UE has not received an SI change indication in any of the previous X modification cycles (multiple), the UE acquires the updated SI. That is, at operation 832, if the UE is in an idle / inactive state, the UE immediately acquires the MIB. At operation 833, the UE acquires SIB1, or reads SIB1. The UE reads the value tag in SIB1 and determines which SIBs are updated. At operation 834, the UE acquires the updated SIB.

[0085] Embodiment 2:

[0086] Fig. 9 A flow chart for receiving an SI change indication together with a RETX COUNT and updating SI according to an embodiment of the present disclosure is shown.

[0087] refer to Fig. 9, at operation 910, the UE receives an SI change indication in a modification period. At operation 920, the UE determines whether RETX COUNT is zero or is received together with the SI change indication. If RETX COUNT is zero or is not received together with the SI change indication, the UE obtains updated SI in the next modification period. At operation 921, if the UE is in an idle / inactive state in the next modification period, the UE obtains the MIB. At operation 922, the UE obtains SIB1 in the next modification period, or reads SIB1. The UE reads the value tag in SIB1 and determines which SIBs are updated. At operation 923, the UE obtains updated SIBs in the next modification period.

[0088] At operation 930, if RETX COUNT is equal to X (where X>0), that is, RETX COUNT exists and is not zero, the UE determines whether the UE has received an SI change indication in any of the previous X modification cycles (multiple). If the UE has received an SI change indication in any of the previous X modification cycles (multiple), then at operation 931, the UE ignores the SI change indication. If the UE has not received an SI change indication in any of the previous X modification cycles (multiple), the UE obtains updated SI in the next modification cycle. At operation 932, if the UE is in an idle / inactive state in the next modification cycle, the UE obtains the MIB. If the UE is in an idle / inactive state, the UE reads the MIB. At operation 933, the UE obtains SIB1 in the next modification cycle, or reads SIB1. The UE reads the value tag in SIB1 and determines which SIBs are updated. At operation 934, the UE obtains the updated SIB in the next modification cycle.

[0089] Embodiment 3:

[0090] In one embodiment, UE operation for receiving the SI change indication together with the RETX COUNT and updating the SI begins with the UE receiving the SI change indication in a modification period.

[0091] If RETX COUNT is zero or is not received together with the SI change indication, the UE obtains (multiple) updated SI from the modification period, which is determined based on the modification period information indicated by the gNB together with the SI change indication. If the modification period information is set to 0, the UE immediately obtains (multiple) updated SI. If the SI change indication is received in modification period N and the modification period information is set to 1, the UE obtains (multiple) updated SI from modification period N+1. If the SI change indication is received in modification period N and the modification period information is set to 2, the UE obtains (multiple) updated SI from modification period N+2. If the SI change indication is received in modification period N and the modification period information is set to i, the UE obtains (multiple) updated SI from modification period N+i.

[0092] If RETX COUNT is equal to X (where X>0), i.e., RETX COUNT is not zero, the UE determines whether an SI change indication is received in any of the previous X modification cycles (multiple). If the UE has received an SI change indication in any of the previous X modification cycles (multiple), the UE ignores the SI change indication. If the UE has not received an SI change indication in any of the previous X modification cycles (multiple), the UE obtains (multiple) updated SI from the modification cycle, which is determined based on the modification cycle information indicated by the gNB together with the SI change indication. If the modification cycle information is set to 0, the UE immediately obtains (multiple) updated SI. If an SI change indication is received in modification cycle N and the modification cycle information is set to 1, the UE obtains (multiple) updated SI from modification cycle N+1. If an SI change indication is received in modification cycle N and the modification cycle information is set to 2, the UE obtains (multiple) updated SI from modification cycle N+2. If an SI change indication is received in modification cycle N and the modification cycle information is set to i, the UE obtains (multiple) updated SI from modification cycle N+i.

[0093] Embodiment 4:

[0094] In one embodiment, UE operation for receiving the SI change indication together with the RETX COUNT and updating the SI begins with the UE receiving the SI change indication in a modification period.

[0095] If RETX COUNT is zero or is not received with the SI change indication, the UE determines whether an SI change indication is received in modification period N. If an SI change indication is received in modification period N, the UE obtains (multiple) updated SIBs from modification period N+K, where K=MAX_SI_CHANGE_TX. MAX_SI_CHANGE_TX is the maximum number of modification periods for which SI change indications are sent. The value of MAX_SI_CHANGE_TX may be predefined or signaled by the gNB in ​​the SI. From modification period N+K, if the UE is in idle / inactive state, the UE reads the MIB. The UE reads SIB1, reads the value tag(s) in SIB1 and determines which SIB(s) are updated. The UE then obtains the updated SIB(s).

[0096] If RETX COUNT is equal to X (where X>0), i.e., RETX COUNT is not zero, the UE determines whether the UE has received an SI change indication in any of the previous X modification cycles (multiple). If the UE has received an SI change indication in any of the previous X modification cycles (multiple), the UE ignores the SI change indication. If the UE has not received an SI change indication in any of the previous X modification cycles (multiple), and receives an SI change indication in modification cycle N, the UE obtains the updated SIB(s) from modification cycle N+K, where K=MAX_SI_CHANGE_TX-RETX COUNT. The value of MAX_SI_CHANGE_TX is the maximum number of modification cycles for which SI change indications are sent. The value of MAX_SI_CHANGE_TX may be predefined or signaled by the gNB in ​​system information. If the UE is in idle / inactive state, the UE reads the MIB from modification cycle N+K. The UE reads SIB1, reads the value tag(s) in SIB1, and determines which SIB(s) are updated. The UE then obtains the updated SIB(s).

[0097] Embodiment 5:

[0098] In one embodiment, by the UE receiving the SI change indication together with the modification period information in the modification period, UE operation for receiving the SI change indication together with the modification period information and updating the SI starts.

[0099] Identifies (multiple) previous X modification cycles (i.e., X = (MAX_SI_CHANGE_TX - modification cycle information). The MAX_SI_CHANGE_TX value is the maximum number of modification cycles for sending SI change indications. The value of MAX_SI_CHANGE_TX can be predefined or signaled by the gNB in ​​the SI.

[0100] If the UE has received an SI change indication in any of the previous X modification period(s), the UE ignores the SI change indication.

[0101] If the UE does not receive an SI change indication in any of the previous X modification cycles (multiple) and receives an SI change indication in modification cycle N, the UE obtains SI from modification cycle N+modification cycle information. If the UE is in an idle / inactive state, the UE reads the MIB, reads SIB1, reads the (multiple) value tags in SIB1 and determines which (which) SIBs are updated. The UE then obtains (multiple) updated SIBs.

[0102] Embodiment 6:

[0103] In one embodiment, UE operations for receiving PWS notifications together with RETX COUNT and updating SI are described.Initially, the UE receives PWS notifications in a modification period.

[0104] If RETX COUNT is zero or is not received with the PWS notification, the UE immediately acquires the updated SI. The UE reads SIB1. If the UE has Earthquake and Tsunami Warning System (ETWS) capability and the si-SchedulingInfo in SIB1 includes scheduling information of SIB6, the UE immediately acquires SIB6. If the UE has ETWS functionality and the si-SchedulingInfo in SIB1 includes scheduling information of SIB7, the UE immediately acquires SIB7. If the UE has Commercial Mobile Alert System (CMAS) capability and the si-SchedulingInfo in SIB1 includes scheduling information of SIB8, the UE immediately acquires SIB8.

[0105] If RETX COUNT is equal to X (where X>0), that is, RETX COUNT is not zero, the UE determines whether the UE has received a PWS notification in any of the previous X modification periods (multiple). If the UE has received a PWS notification in any of the previous X modification periods (multiple), the UE ignores the PWS notification. If the UE has not received a PWS notification in any of the previous X modification periods (multiple), the UE immediately acquires the updated SI. The UE reads SIB1. If the UE has ETWS functionality and the si-SchedulingInfo in SIB1 includes scheduling information for SIB6, the UE immediately acquires SIB6. If the UE has ETWS functionality and the si-SchedulingInfo in SIB1 includes scheduling information for SIB7, the UE immediately acquires SIB7. If the UE has CMAS capability and the si-SchedulingInfo in SIB1 includes scheduling information for SIB8, the UE immediately acquires SIB8.

[0106] In the above explained embodiment, RETX COUNT may be separate for SI change indication and PWS notification.

[0107] Method 2:

[0108] In the method of the present disclosure, it is proposed to specify a SIB1 acquisition period T. In one embodiment, T may be a multiple of the SI modification period. In this example, T may be predefined or signaled in the SI (e.g., SIB1). The SIB1 acquisition period T starts in (multiple) radio frames that satisfy SFN mod T=0.

[0109] It is proposed that if the UE does not receive SI change indication in the SIB1 acquisition cycle and does not read SIB1, the UE acquires SIB1 in the next SIB1 acquisition cycle. The UE can also read the MIB if it is in idle / inactive state. The advantage of this approach is that if the gNB fails to send SI change indication in all POs of the default DRX cycle even after attempting SI change indication transmission in multiple modification cycles, the UE can read SIB1 autonomously and understand the updated SI based on the value tag in SIB1.

[0110] Fig.10 An example according to an embodiment of the present disclosure is shown, in which the gNB is unable to send an SI change indication in PO2 of a default DRX cycle even after attempting transmission in multiple modification cycles.

[0111] refer to Fig.10, the (multiple) UEs monitoring PO2 will autonomously read SIB1 in SIB1 acquisition cycle 2 because no SI change indication was received during SIB1 acquisition cycle 1 and the UE did not read SIB1 during SIB1 acquisition cycle 1.

[0112] In an alternative embodiment, it is proposed that if the UE does not receive a short message (indicating SI change indication or PWS notification) in the SIB1 acquisition cycle and does not read SIB1, the UE acquires SIB1 in the next SIB1 acquisition cycle. If the UE is in idle / inactive state, the UE can also read the MIB.

[0113] Method 3:

[0114] In the method of the present disclosure, it is proposed to define a common area for sending and receiving SI change indication and / or PWS notification.

[0115] Fig.11 An example of a common area according to an embodiment of the present disclosure is shown.

[0116] refer to Fig.11 , the common area can exist periodically (for example, each SI update period signaled in the SI). Alternatively, the common area can be defined in each modification period. The common area is monitored by each UE in the cell, regardless of its PO. The advantage of this approach is that there is no need to send SI change indications and / or PWS notifications in each PO of the default DRX cycle. This reduces the number of required transmissions of SI change indications and / or PWS notifications and minimizes any impact on unlicensed carriers caused by listen-before-send (LBT).

[0117] The time and frequency position of the common area can be signaled in the SI. In one embodiment, at the beginning of each SI update cycle, the common area is a window including N time slots. In this example, N is signaled in the SI. The time slot length is determined based on the subcarrier spacing (SCS) of the bandwidth part (BWP) of the sending or receiving SI change indication and / or PWS notification. The N value can also be signaled in ms instead of time slots. In one embodiment, the UE monitors a window including N time slots at the beginning of each SI update cycle to receive SI change indications and / or PWS notifications.

[0118] Fig.12 Another example of a common area according to an embodiment of the present disclosure is shown.

[0119] refer to Fig.12, the common area may be a first PO corresponding to a first paging frame (PF) in a first default DRX cycle of the modification cycle. Each modification cycle includes a plurality of default DRX cycles. Each default DRX cycle is composed of a plurality of PFs, and each PF has one or more POs.

[0120] In another embodiment of the present disclosure, the common area may be a first PO corresponding to a first PF in each default DRX cycle of the modification cycle. Each modification cycle includes multiple default DRX cycles. Each default DRX cycle is composed of multiple PFs, and each PF has one or more POs.

[0121] In another embodiment of the present disclosure, the common area may be the i-th PO corresponding to the first PF of the default DRX cycle of the modified period. The value of i is signaled by the gNB in ​​the SI. Each modified period includes multiple default DRX cycles. Each default DRX cycle consists of multiple PFs, and each PF has one or more POs.

[0122] In another embodiment of the present disclosure, the common area may be the i-th PO corresponding to the first PF of each default DRX cycle of the modification cycle. The value of i is signaled by the gNB in ​​the SI. Each modification cycle includes multiple default DRX cycles. Each default DRX cycle includes multiple PFs, each PF having one or more POs.

[0123] In the method of the present disclosure, in order to receive SI change indication and / or PWS notification, the UE monitors the common area as described above. In order to receive paging messages, the UE monitors its PO. This is different from the current system, in which the UE monitors its PO to receive both SI change indication and / or PWS notification and paging messages.

[0124] 2. Method for configuring the number of PFs (N) in the DRX cycle

[0125] In a 5G wireless communication system (also known as Next Generation Radio or NR), PDCCH is used to schedule DL transmissions on a physical downlink (DL) shared channel (PDSCH) and UL transmissions on a physical uplink (UL) shared channel (PUSCH), wherein the DCI on the PDCCH includes: a downlink assignment, which includes at least a modulation and coding format, a resource allocation, and hybrid automatic repeat request (ARQ) information related to a DL shared channel (DL-SCH); and a UL scheduling grant, which includes at least a modulation and coding format, a resource allocation, and hybrid ARQ information related to a UL shared channel (UL-SCH). In addition to scheduling, the PDCCH can also be used for: activation and deactivation of configured PUSCH transmissions with configured grants; activation and deactivation of PDSCH semi-persistent transmissions; notifying one or more UEs of the time slot format; notifying one or more UEs of (multiple) physical resource blocks ((multiple) PRBs) and (multiple) orthogonal frequency division multiplexing (OFDM) symbols, where the UE can assume that there are no transmissions for the UE; sending transmission power control (TPC) commands for PUCCH and PUSCH; sending one or more TPC commands for sounding reference signal (SRS) transmission by one or more UEs; switching the active bandwidth part of the UE; initiating a random access procedure. The UE monitors a set of PDCCH candidates in the configured monitoring opportunities in one or more configured control resource sets (CORESETs) according to the corresponding search space configuration. A CORESET consists of a set of PRBs with a duration of 1 to 3 OFDM symbols. Resource units Resource element groups (REGs) and control channel elements (CCEs) are defined within a CORESET, where each CCE consists of a set of REGs. The control channel is formed by the aggregation of CCEs. Different code rates for control channels are achieved by aggregating different numbers of CCEs. Interleaved and non-interleaved CCE to REG mapping is supported in CORESET. Polarity coding is used for PDCCH. Each REG carrying PDCCH carries its own demodulation reference signal (DMRS). Quadrature Phase Shift Keying (QPSK) modulation is used for PDCCH.

[0126] In NR, a list of search space configurations for each configured BWP is signaled by the gNB, where each search configuration is uniquely identified by an identifier. The identifier of the search space configuration to be used for a specific purpose (such as paging reception, SI reception, and random access response reception) is explicitly signaled by the gNB. In NR, the search space configuration includes the parameters Monitoring-periodicity-PDCCH-slot, Monitoring-offset-PDCCH-slot, Monitoring-symbols-PDCCH-within-slot, and duration. The UE uses the parameters PDCCH monitoring period (Monitoring-periodicity-PDCCH-slot), PDCCH monitoring offset (Monitoring-offset-PDCCH-slot), and PDCCH monitoring mode (Monitoring-symbols-PDCCH-within-slot) to determine the PDCCH monitoring opportunity(s) within a timeslot. There are PDCCH monitoring opportunities in time slots "x" to x+duration, where the time slot with number "x" in the radio frame with number "y" satisfies the following equation;

[0127] (y*(number of slots in a radio frame)+x-Monitoring-offset-PDCCH-slot)mod(Monitoring-periodicity-PDCCH-slot)=0;

[0128] The starting symbol of the PDCCH monitoring opportunity in each slot with a PDCCH monitoring opportunity is given by Monitoring-symbols-PDCCH-within-slot. The length of the PDCCH monitoring opportunity (in symbols) is given in the CORESET associated with the search space. The search space configuration includes an identifier of the CORESET configuration associated with the search space configuration. A list of CORESET configurations for each configured BWP is signaled by the gNB, where each CORESET configuration is uniquely identified by an identifier. Note that the duration of each radio frame is 10ms. A radio frame is identified by a radio frame number or system frame number (SFN). Each radio frame consists of several slots, where the number of slots in a radio frame and the slot duration depend on the SCS. Because each supported SCS is predefined in NR, the number of slots in a radio frame and the slot duration depend on the radio frame.

[0129] In a 5G (also known as NR or New Radio) wireless communication system, a paging message is sent to a paging UE that is attached to a wireless communication network but is in idle / inactive mode. In idle / inactive mode, the UE wakes up in short cycles at regular intervals (i.e., every paging DRX cycle) to receive paging messages and other broadcast information. The network can configure several POs in the DRX cycle. In the PO, a paging message is sent using the PDSCH. If there is a paging message in the PDSCH, the PDCCH is addressed to the P-RNTI. The P-RNTI is common to all UEs. Therefore, the UE identity (i.e., System Architecture Evolution (SAE)-Temporary Mobile User Identity (S-TMSI)) is included in the paging message to indicate a paging message for a specific UE. The paging message may include multiple UE identities to page multiple UEs. The paging message is broadcast (i.e., the PDCCH is masked by the P-RNTI) on the data channel (i.e., the PDSCH).

[0130] The UE monitors one PO for each DRX cycle. The UE determines its PO based on the UE identifier (ID). The UE first determines the PF and then determines the PO relative to the determined PF. One PF is a radio frame (10ms). The PF is a radio frame with SFN that satisfies:

[0131] (SFN+PF_offset)mod T=(T div N)*(UE_ID mod N)

[0132] The index i_s indicates the index of the PO and is determined by:

[0133] i_s=floor(UE_ID / N)mod Ns

[0134] The PDCCH monitoring opportunity for paging is determined according to the paging-SearchSpace. If the paging-SearchSpace is set to zero, Ns is 1 or 2. For Ns=1, there is only one PO starting from the first PDCCH monitoring opportunity for paging in the PF. For Ns=2, the PO is located in the first half frame (i_s=0) or the second half frame (i_s=1) of the PF. If the paging-SearchSpace is set to zero, the PDCCH monitoring opportunity for paging is the same as the PDCCH monitoring opportunity for SIB1.

[0135] If paging-SearchSpace is not set to zero, the UE monitors the (i_s+1)th PO. The PDCCH monitoring occasion for paging is determined according to the search space configuration indicated by paging-SearchSpace. Starting from the first PDCCH monitoring occasion for paging in the PF, the PDCCH monitoring occasions for paging that do not overlap with UL symbols are numbered sequentially from zero. When firstPDCCH-MonitoringOccasionOfPO is available (i.e. configured by the gNB), the (i_s+1)th PO is a set of S consecutive PDCCH monitoring occasions for paging starting from the PDCCH monitoring occasion indicated by firstPDCCH-MonitoringOccasionOfPO (i.e. the (i_s+1)th value of the firstPDCCH-MonitoringOccasionOfPO parameter). Otherwise, the (i_s+1)th PO is a set of S consecutive PDCCH monitoring opportunities for paging starting from the (i_s*S)th PDCCH monitoring opportunity for paging, where S is the number of transmitted synchronization signal blocks (SSBs) determined according to ssb-PositionsInBurst in SIB1. The Kth PDCCH monitoring opportunity for paging in the PO corresponds to the Kth transmitted SSB.

[0136] The following parameters are used to calculate PF and i_s above:

[0137] The parameter T corresponds to the DRX cycle of the UE. The value of T is determined by the shortest of the UE-specific DRX values ​​(if configured by RRC or higher layers) and the default paging cycle duration broadcast in the SI. If UE-specific DRX is not configured by RRC or higher layers, the default value will be applied.

[0138] The parameter N is the total number of PFs in T.

[0139] The parameter Ns is the number of paging occasions used for PF.

[0140] The parameter PF_offset is the offset used for PF determination.

[0141] UE_ID is 5G-S-TMSI mod 1024.

[0142] According to the current design, the number of PFs N in a DRX cycle may be configurable. The gNB may select any value from {T, T / 2, T / 4, T / 8, and T / 16}. The problem is that when the gNB wants to send PDCCH for paging at the same time as it also sends PDCCH for SIB1 (or Remaining Minimum System Information (RMSI)), selecting any value from {T, T / 2, T / 4, T / 8, and T / 16} may be inefficient. The PF may not be aligned with the radio frame in which the PDCCH for SIB1 (or RMSI) is sent. Therefore, an efficient method for selecting the value of N is needed.

[0143] In the method of the present disclosure, it is proposed that the gNB selects the N value from one of the following sets based on one or more of the pagingSearchSpace configuration, the RMSI reuse mode (mode 1, 2 or 3) and ssb-periodicityServingCell (i.e., the period of the SSB sent in the serving cell). The RMSI reuse mode is also called the synchronization signal (SS) / physical broadcast channel (PBCH) block (SSB) and CORESET reuse mode. This parameter is signaled by the gNB in ​​SIB1:

[0144] - Set 1: {T,T / 2,T / 4,T / 8,T / 16}

[0145] - Set 2: {T / 2,T / 4,T / 8,T / 16}

[0146] - Set 3: {T / 4,T / 8,T / 16}

[0147] - Set 4: {T / 8,T / 16}

[0148] -Set 5: T / 16

[0149] Fig.13 The gNB operation for selecting the total number of PFs in the SI change indication in the DRX cycle of the terminal according to an embodiment of the present disclosure is shown.

[0150] refer to Fig.13 , at operation 1310, the gNB identifies pagingSearchSpace. If pagingSearchSpace is not set to zero, at operation 1311, the gNB selects N from set 1.

[0151] If pagingSearchSpace is set to zero, then at operation 1320, the gNB identifies the RMSI multiplexing mode. The RMSI may reference SIB1. For SS / PBCH blocks and CORESET multiplexing mode 1, the SIB1 repetition transmission period is 20 ms. For SS / PBCH blocks and CORESET multiplexing mode 2 / 3, the SIB1 repetition transmission period is the same as the SSB period. The UE may monitor the PDCCH based on the SS / PBCH blocks and CORESET multiplexing mode. For SS / PBCH blocks and CORESET multiplexing mode 1, the UE may monitor the PDCCH in slot n. 0 The UE monitors the PDCCH in the Type0-PDCCH common search space (CSS) set on two consecutive time slots starting from 1. For SS / PBCH blocks and CORESET multiplexing modes 2 and 3, the UE monitors the PDCCH in the Type0-PDCCH CSS set on one time slot, where the Type0-PDCCH CSS set periodicity is equal to the periodicity of the SS / PBCH block. If the RMSI multiplexing mode is 1, at operation 1321, the gNB selects N from set 2.

[0152] If the RMSI reuse mode is 2 or 3: At operations 1330, 1340, 1350, and 1360, the gNB identifies the ssb-periodicityServingCell. If the ssb-periodicityServingCell is 5 ms or 10 ms, at operation 1331, N is selected from set 1. If the ssb-periodicityServingCell is 20 ms, at operation 1341, N is selected from set 2. If the ssb-periodicityServingCell is 40 ms, at operation 1351, N is selected from set 3. If the ssb-periodicityServingCell is 80 ms, at operation 1361, N is selected from set 4. If the ssb-periodicityServingCell is 160 ms, at operation 1370, N is selected from set 5. The selected N value is broadcasted by the gNB in ​​the paging configuration in SIB1.

[0153] In an embodiment of the present disclosure, if pagingSearchSpace is zero and RMSI reuse mode is 1, the gNB sets PF_offset to zero and signals it in the paging configuration. If pagingSearchSpace is zero and RMSI reuse mode is 2 or 3, the gNB sets PF_offset to "X", where "X" is the SFN of the earliest radio frame in the SFN cycle in which the gNB sends SSB. In an embodiment of the present disclosure, if pagingSearchSpace is zero and RMSI reuse mode is 1, the gNB sets Ns equal to 1 and signals it in the paging configuration. If pagingSearchSpace is zero and RMSI reuse mode is 2 or 3 and ssb-periodicityServingCell is 5ms, the gNB sets Ns equal to 1 or 2 and signals it in the paging configuration. If pagingSearchSpace is zero, and RMSI reuse mode is 2 or 3, and ssb-periodicityServingCell is not 5ms, the gNB sets Ns equal to 1 and signals it in the paging configuration. By selecting the parameter values ​​as explained above, the gNB can align the paging frame with the radio frame in which the PDCCH is transmitted, and also align the PDCCH monitoring occasions for paging with the PDCCH monitoring occasions of SIB1.

[0154] Fig.14 is a block diagram of a base station according to an embodiment of the present disclosure.

[0155] refer to Fig.14 , the base station includes a transceiver 1410, a controller 1420, and a memory 1430. The controller 1420 may refer to a circuit, an ASIC, an FPGA, or at least one processor. The transceiver 1410, the controller 1420, and the memory 1430 are configured to execute the drawings (for example, Figures 1 to 7 and Figures 10 to 13 ) or as described above. Although transceiver 1410, controller 1420, and memory 1430 are shown as separate entities, they may be implemented as a single entity and integrated onto a single chip. Transceiver 1410, controller 1420, and memory 1430 may also be electrically connected or coupled to each other.

[0156] The transceiver 1410 may transmit and receive signals to and from other network entities such as a terminal.

[0157] The controller 1420 may control the gNB to perform the functions according to the above-described embodiments. For example, the controller 1420 is configured to determine the number of PFs N in the DRX cycle based on information about a paging search space (e.g., pagingSearchSpace). The controller 1420 is configured to send information about the number of PFs in SIB1 to the terminal via the transceiver 1410. The controller 1420 is configured to identify at least one PF based on the number of PFs, and to send at least one paging message in at least one PF to the terminal via the transceiver 1410. The controller 1420 may be further configured to identify the SSB and CORESET multiplexing mode (e.g., RMSI multiplexing mode) and the periodicity of the SSB sent in the serving cell (e.g., ssb-periodicityServingCell).

[0158] In one embodiment, the operation of the base station can be implemented using a memory 1430 storing corresponding program codes. Specifically, the base station can be equipped with a memory 1430 to store program codes that implement the desired operation. In order to perform the desired operation, the controller 1420 can read and execute the program code stored in the memory 1430 by using a processor or a central processing unit (CPU).

[0159] Fig.15 is a block diagram of a terminal according to an embodiment of the present disclosure.

[0160] refer to Fig.15 The terminal includes a transceiver 1510, a controller 1520, and a memory 1530. The controller 1520 may refer to a circuit, an ASIC, an FPGA, or at least one processor. The transceiver 1510, the controller 1520, and the memory 1530 are configured to execute the drawings (for example, Figure 1 , Figure 3 , Figure 5 and Figures 8 to 12 ), or as described above. Although the transceiver 1510, the controller 1520, and the memory 1530 are shown as separate entities, they may be integrated into a single chip. The transceiver 1510, the controller 1520, and the memory 1530 may also be electrically connected or coupled to each other.

[0161] The transceiver 1510 may transmit and receive signals to and from other network entities, such as a base station.

[0162] The controller 1520 may control the UE to perform the functions according to the above embodiments. For example, the controller 1520 is configured to receive information about the number of PFs N in the DRX cycle in SIB1 from the base station via the transceiver 1510. The controller 1520 is configured to identify at least one PF based on the number of PFs, and receive at least one paging message in at least one PF from the base station via the transceiver 1510.

[0163] In one embodiment, the operation of the terminal can be implemented using a memory 1530 storing corresponding program codes. Specifically, the terminal can be equipped with a memory 1530 to store program codes for implementing desired operations. In order to perform desired operations, the controller 1520 can read and execute the program codes stored in the memory 1530 by using a processor or CPU.

[0164] While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.

Claims

1. A method for sending a paging message performed by a base station, include: determining whether a paging search space configuration indicates that the search space configuration is zero or indicates that the search space configuration is not zero; Determine the number of paging frames PF in a discontinuous reception DRX cycle based on the paging search space configuration; Sending information about the number of PFs to the terminal in system information block 1 SIB1; identifying at least one PF based on the number of PFs; as well as sending at least one paging message in the at least one PF to the terminal, Wherein, when the paging search space configuration indicates that the search space configuration is not zero, the number of PFs is determined from the first group {T, T / 2, T / 4, T / 8, T / 16}, Wherein, T is the DRX cycle of the terminal.

2. The method according to claim 1, in, The search space configuration being non-zero indicates a Physical Downlink Control Channel (PDCCH) monitoring opportunity for paging.

3. The method according to claim 1, in, In the case where the paging search space configuration indicates that the search space configuration is zero, the synchronization signal SS / physical broadcast channel PBCH block SSB and the control resource set CORESET multiplexing mode are determined, Wherein, when the SSB and CORESET multiplexing modes are 1, the number of PFs is determined from the second group {T / 2, T / 4, T / 8, T / 16}, and The search space configuration being zero indicates that the physical downlink control channel PDCCH monitoring timing used for paging is the same as that used for SIB1.

4. The method according to claim 1, in, The determining the number of PFs further comprises: In the case where the paging search space configuration indicates that the search space configuration is zero, determining a synchronization signal SS / physical broadcast channel PBCH block SSB and a control resource set CORESET multiplexing mode; and Determines the periodicity of SSB sent in the serving cell when the SSB and CORESET multiplexing mode is 2 or 3, Wherein, when the periodicity of the SSB is 5 ms or 10 ms, the number of PFs is determined from the first group {T, T / 2, T / 4, T / 8, T / 16}, Wherein, when the periodicity of the SSB is 20ms, the number of PFs is determined from the second group {T / 2, T / 4, T / 8, T / 16}, Wherein, when the periodicity of the SSB is 40ms, the number of PFs is determined from the third group {T / 4, T / 8, T / 16}, Wherein, when the periodicity of the SSB is 80ms, the number of PFs is determined from the fourth group {T / 8, T / 16}, Wherein, when the periodicity of the SSB is 160ms, the number of PFs is determined to be T / 16; and The search space configuration being zero indicates that the physical downlink control channel PDCCH monitoring timing used for paging is the same as that used for SIB1.

5. A base station in a wireless communication system, include: Transceiver; as well as At least one processor configured to: determining whether a paging search space configuration indicates that the search space configuration is zero or indicates that the search space configuration is not zero; Based on the paging search space configuration, determine the number of paging frames PF in the discontinuous reception DRX cycle, sending information about the number of PFs to the terminal in a system information block 1 SIB1 via the transceiver, identifying at least one PF based on the number of PFs, and sending, via the transceiver, at least one paging message in the at least one PF to the terminal, Wherein, in the case where the paging search space configuration indicates that the search space configuration is not zero, the at least one processor is configured to determine the number of PFs from a first group {T, T / 2, T / 4, T / 8, T / 16}, T is the DRX cycle of the terminal.

6. The base station according to claim 5, in, The search space configuration being non-zero indicates a Physical Downlink Control Channel (PDCCH) monitoring opportunity for paging.

7. The base station according to claim 5, in, In the case where the paging search space configuration indicates that the search space configuration is zero, the at least one processor is configured to determine a synchronization signal SS / physical broadcast channel PBCH block SSB and a control resource set CORESET multiplexing mode, The at least one processor is configured to determine the number of PFs from the second group {T / 2, T / 4, T / 8, T / 16} when the SSB and CORESET multiplexing modes are 1, and The search space configuration being zero indicates that the physical downlink control channel PDCCH monitoring timing used for paging is the same as that used for SIB1.

8. The base station according to claim 5, in, The at least one processor is configured to: In the case where the paging search space configuration indicates that the search space configuration is zero, the synchronization signal SS / physical broadcast channel PBCH block SSB and the control resource set CORESET multiplexing mode are determined, determining the periodicity of SSBs transmitted in the serving cell in case the SSB and CORESET multiplexing mode is 2 or 3, Wherein, when the periodicity of the SSB is 5 ms or 10 ms, the number of PFs is determined from the first group {T, T / 2, T / 4, T / 8, T / 16}, Wherein, when the periodicity of the SSB is 20ms, the number of PFs is determined from the second group {T / 2, T / 4, T / 8, T / 16}, Wherein, when the periodicity of the SSB is 40ms, the number of PFs is determined from the third group {T / 4, T / 8, T / 16}, Wherein, when the periodicity of the SSB is 80ms, the number of PFs is determined from the fourth group {T / 8, T / 16}, Wherein, when the periodicity of the SSB is 160ms, the number of PFs is determined to be T / 16; and The search space configuration being zero indicates that the physical downlink control channel PDCCH monitoring timing used for paging is the same as that used for SIB1.

9. A method for receiving a paging message performed by a terminal, include: Receiving information about the number of paging frames PF in a discontinuous reception DRX cycle from a base station in a system information block 1 SIB1; determining at least one PF based on the number of PFs; as well as receiving at least one paging message in the at least one PF from the base station, The number of PFs is determined based on whether the paging search space configuration indicates that the search space configuration is zero or indicates that the search space configuration is not zero, Wherein, when the paging search space configuration indicates that the search space configuration is not zero, the number of PFs is identified from the first group {T, T / 2, T / 4, T / 8, T / 16}, Wherein, T is the DRX cycle of the terminal.

10. The method according to claim 9, in, The search space configuration being non-zero indicates a Physical Downlink Control Channel (PDCCH) monitoring opportunity for paging.

11. The method according to claim 9, in, In case the paging search space configuration indicates that the search space configuration is zero and the synchronization signal SS / physical broadcast channel PBCH block SSB and control resource set CORESET multiplexing mode is 1, the number of PFs is identified from the second group {T / 2, T / 4, T / 8, T / 16}, and The search space configuration being zero indicates that the physical downlink control channel PDCCH monitoring timing used for paging is the same as that used for SIB1.

12. The method according to claim 9, in, In a case where the paging search space configuration indicates that the search space configuration is zero, the synchronization signal SS / physical broadcast channel PBCH block SSB and the control resource set CORESET multiplexing mode is 2 or 3, and the periodicity of the SSB is 5ms or 10ms, the number of PFs is determined from the first group {T, T / 2, T / 4, T / 8, T / 16}, Wherein, when the paging search space configuration indicates that the search space configuration is zero, the SSB and CORESET multiplexing mode is 2 or 3, and the periodicity of the SSB is 20ms, the number of PFs is determined from the second group {T / 2, T / 4, T / 8, T / 16}, Wherein, when the paging search space configuration indicates that the search space configuration is zero, the SSB and CORESET multiplexing mode is 2 or 3, and the periodicity of the SSB is 40ms, the number of PFs is determined from the third group {T / 4, T / 8, T / 16}, Wherein, when the paging search space configuration indicates that the search space configuration is zero, the SSB and CORESET multiplexing mode is 2 or 3, and the periodicity of the SSB is 80ms, the number of PFs is determined from the fourth group {T / 8, T / 16}, Wherein, when the paging search space configuration indicates that the search space configuration is zero, the SSB and CORESET multiplexing mode is 2 or 3, and the periodicity of the SSB is 160ms, the number of PFs is determined to be T / 16, and The search space configuration being zero indicates that the physical downlink control channel PDCCH monitoring timing used for paging is the same as that used for SIB1.

13. A terminal in a wireless communication system, include: Transceiver; as well as At least one processor configured to: receiving, via the transceiver, information about the number of paging frames PF in a discontinuous reception DRX cycle from a base station in a system information block 1 SIB1, determining at least one PF based on the number of PFs, and receiving, via the transceiver, at least one paging message in the at least one PF from the base station, The number of PFs is determined based on whether the paging search space configuration indicates that the search space configuration is zero or indicates that the search space configuration is not zero, Wherein, when the paging search space configuration indicates that the search space configuration is not zero, the number of PFs is identified from the first group {T, T / 2, T / 4, T / 8, T / 16}, Wherein, T is the DRX cycle of the terminal.

14. The terminal according to claim 13, in, The search space configuration being non-zero indicates a Physical Downlink Control Channel (PDCCH) monitoring opportunity for paging.

15. The terminal according to claim 13, in, In a case where the paging search space configuration indicates that the search space configuration is zero and the synchronization signal SS / physical broadcast channel PBCH block SSB and control resource set CORESET multiplexing mode is 1, determining the number of PFs from the second group {T / 2, T / 4, T / 8, T / 16}, Wherein, when the paging search space configuration indicates that the search space configuration is zero, the SSB and CORESET multiplexing mode is 2 or 3, and the periodicity of the SSB is 5 ms or 10 ms, the number of PFs is determined from the first group {T, T / 2, T / 4, T / 8, T / 16}, Wherein, when the paging search space configuration indicates that the search space configuration is zero, the SSB and CORESET multiplexing mode is 2 or 3, and the periodicity of the SSB is 20ms, the number of PFs is determined from the second group {T / 2, T / 4, T / 8, T / 16}, Wherein, when the paging search space configuration indicates that the search space configuration is zero, the SSB and CORESET multiplexing mode is 2 or 3, and the periodicity of the SSB is 40ms, the number of PFs is determined from the third group {T / 4, T / 8, T / 16}, Wherein, when the paging search space configuration indicates that the search space configuration is zero, the SSB and CORESET multiplexing mode is 2 or 3, and the periodicity of the SSB is 80ms, the number of PFs is determined from the fourth group {T / 8, T / 16}, Wherein, when the paging search space configuration indicates that the search space configuration is zero, the SSB and CORESET multiplexing mode is 2 or 3, and the periodicity of the SSB is 160ms, the number of PFs is determined to be T / 16, and The search space configuration being zero indicates that the physical downlink control channel PDCCH monitoring timing used for paging is the same as that used for SIB1.

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