Systems and methods for common signal / channel reception
The system addresses downlink coverage issues in non-terrestrial and IoT networks by employing repetition techniques for common channels based on device and network type, improving reception reliability and coverage.
Patent Information
- Application Number
- PCT/CN2024/085467
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-07-31
AI Technical Summary
Existing wireless communication systems face challenges in ensuring reliable reception of common downlink channels, particularly in non-terrestrial networks and IoT scenarios, due to limited transmission power and beamforming gaps, which affect downlink coverage and signal propagation.
The system employs repetition techniques for common downlink channels such as SIB1, SIBx, random access PDSCH, and paging, determining repetition based on device type, network type, aggregation level, and PDCCH transmission, with indications provided through bit flags, fields, or UE-specific signaling.
Enhances downlink coverage by ensuring reliable reception of critical system information and access signals, even in challenging propagation conditions, by optimizing repetition methods for various wireless communication devices and networks.
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Figure CN2024085467_31072025_PF_FP_ABST
Abstract
Description
SYSTEMS AND METHODS FOR COMMON SIGNAL / CHANNEL RECEPTIONTECHNICAL FIELD
[0001] The disclosure relates generally to wireless communications, including but not limited to systems and methods for common signal / channel reception.BACKGROUND
[0002] The standardization organization Third Generation Partnership Project (3GPP) is currently in the process of specifying a new Radio Interface called 5G New Radio (5G NR) as well as a Next Generation Packet Core Network (NG-CN or NGC) . The 5G NR will have three main components: a 5G Access Network (5G-AN) , a 5G Core Network (5GC) , and a User Equipment (UE) . In order to facilitate the enablement of different data services and requirements, the elements of the 5GC, also called Network Functions, have been simplified with some of them being software based, and some being hardware based, so that they could be adapted according to need. Communication via satellite is one of the typical scenarios of the non-terrestrial networks in 3GPP standardization.SUMMARY
[0003] The example embodiments disclosed herein are directed to solving the issues relating to one or more of the problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings. In accordance with various embodiments, example systems, methods, devices and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and are not limiting, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of this disclosure.
[0004] At least one aspect is directed to a system, method, apparatus, or a computer-readable medium of the following. A wireless communication device (e.g., a user equipment (UE) ) may determine whether there is to be repetition in a common downlink (DL) channel (e.g., channel transmission / signal / signaling / communication, or transmission / signal / signaling / communication of the channel) to be received. The wireless communication device may perform reception of the common DL channel according to the determination. In some embodiments, the common DL channel to be received can be at least one of: a system information block type 1 (SIB1) ; a system information block type x (SIBx) , where x is a positive integer value; a random access related physical downlink shared channel (PDSCH) transmission; or a paging (e.g., a paging message / transmission / signal / commuication) .
[0005] In some embodiments, if / when the common DL channel to be received is the SIB1, the SIBx, or the random access related PDSCH transmission, whether there is to be repetition can be indicated according to a type of the wireless communication device or a type of a network to be accessed by the wireless communication device. The type of the wireless communication device or the type of the network may correspond to: non-terrestrial network (NTN) or internet of things (IoT) . In some embodiments, a repetition number of the repetition can be a defined value or can be in a defined set of values. In some embodiments, the wireless communication device may receive an indication of a repetition number to be used after successfully accessing the network (e.g., is in RRC connected state) .
[0006] In some embodiments, if / when the common DL channel to be received is the SIB1, the SIBx, the random access related PDSCH transmission, or the paging, whether there is to be repetition can be determined according to an aggregation level of a corresponding physical downlink control channel (PDCCH) transmission. In some embodiments, a repetition number of the repetition can be same as the aggregation level of the corresponding PDCCH transmission.
[0007] In some embodiments, the wireless communication device may determine a repetition number of the repetition according to a repetition scaling factor and the aggregation level of the corresponding PDCCH transmission. In some embodiments, the wireless communication device may determine a repetition number of the repetition to be a value mapped to the aggregation level of the corresponding PDCCH transmission, or mapped to a range within which the aggregation level resides.
[0008] In some embodiments, if / when the common DL channel to be received is the SIB1, the SIBx, the random access related PDSCH transmission, or the paging, a repetition number of the repetition can be indicated in a physical downlink control channel (PDCCH) transmission, a master information block (MIB) signaling, a system information (SI) signaling, or a system information block type 1 (SIB1) signaling. In some embodiments, whether there is to be repetition can be indicated by a bit flag or a field.
[0009] In some embodiments, at least one of: if / when the bit flag has a first value, there is to be repetition; if / when the bit flag is a second value, there is no repetition; if there is to be repetition, the repetition number is a defined value or is in a defined set of values; or after successfully accessing the network, the wireless communication device receives an indication of the repetition number to be used. In some embodiments, the field may comprise the repetition number or an index of the repetition number. In some embodiments, the field can be in a format of {SI index, repetition number} , a list of {SI index, repetition number} , a format of {SI index1, SI index2, …SI indexN, repetition number} , or a list of {SI index1, SI index2, …SI indexN, repetition number} . N can be a positive integer value.
[0010] In some embodiments, if / when the common DL channel to be received is the SIBx, whether there is to be repetition can be after a repetition of SIB1. In some embodiments, if / when the common DL channel to be received is the random access related PDSCH transmission, whether there is to be repetition can be after a repetition of SIB1 or a repetition of SIBx.
[0011] In some embodiments, if / when the common DL channel to be received is the paging, whether there is to be repetition can be after a repetition of other / another DL channel. In some embodiments, if / when the common DL channel to be received includes at least one of: the SIB1 or the SIBx, the reception can be performed in a plurality of consecutive slots using a same time-frequency resource. A time duration of the SIBx repetition is shorter than or equal to a time duration of a system information (SI) scheduling window.
[0012] In some embodiments, if / when the common DL channel to be received is a random access related PDSCH transmission, the reception can be performed in a plurality of consecutive slots using a same time-frequency resource. A time duration of the random access related PDSCH repetition can be shorter than or equal to a time duration of a MSG2 random access response (RAR) window. In some embodiments, if / when the common DL channel to be received is the paging, the reception can be performed in a plurality of consecutive slots using a same time-frequency resource. A time duration of the paging with repetition can be shorter than or equal to a discontinuous reception (DRX) cycle or an extended DRX cycle.
[0013] In some embodiments, if / when the common DL channel to be received includes at least one of: the random access related PDSCH transmission or the paging, the wireless communication device may skip a time-frequency resource that overlaps with that used for another common channel and resumes the reception after the time-frequency resource. In certain embodiments, the time-frequency resource that is skipped can be counted towards meeting a repetition factor to complete the repetition. In certain embodiments, the time-frequency resource that is skipped may not be counted towards meeting a repetition factor to complete the repetition.
[0014] In some embodiments, a wireless communication node (e.g., a base station (BS) , a gNB) may transmit a common downlink (DL) channel to a wireless communication device (e.g., a user equipment (UE) ) . A wireless communication device may determine whether there is to be repetition in the common DL channel to be received.BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Various example embodiments of the present solution are described in detail below with reference to the following figures or drawings. The drawings are provided for purposes of illustration only and merely depict example embodiments of the present solution to facilitate the reader's understanding of the present solution. Therefore, the drawings should not be considered limiting of the breadth, scope, or applicability of the present solution. It should be noted that for clarity and ease of illustration, these drawings are not necessarily drawn to scale.
[0016] FIG. 1 illustrates an example cellular communication network in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure;
[0017] FIG. 2 illustrates a block diagram of an example base station and a user equipment device, in accordance with some embodiments of the present disclosure;
[0018] FIG. 3 illustrates an example framework for common signal reception, in accordance with some embodiments of the present disclosure; and
[0019] FIG. 4 illustrates a flow diagram of an example method for common signal reception, in accordance with an embodiment of the present disclosure.DETAILED DESCRIPTION
[0020] 1. Mobile Communication Technology and Environment
[0021] FIG. 1 illustrates an example wireless communication network, and / or system, 100 in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure. In the following discussion, the wireless communication network 100 may be any wireless network, such as a cellular network or a narrowband Internet of things (NB-IoT) network, and is herein referred to as “network 100. ” Such an example network 100 includes a base station 102 (hereinafter “BS 102” ; also referred to as wireless communication node) and a user equipment device 104 (hereinafter “UE 104” ; also referred to as wireless communication device) that can communicate with each other via a communication link 110 (e.g., a wireless communication channel) , and a cluster of cells 126, 130, 132, 134, 136, 138 and 140 overlaying a geographical area 101. In Figure 1, the BS 102 and UE 104 are contained within a respective geographic boundary of cell 126. Each of the other cells 130, 132, 134, 136, 138 and 140 may include at least one base station operating at its allocated bandwidth to provide adequate radio coverage to its intended users.
[0022] For example, the BS 102 may operate at an allocated channel transmission bandwidth to provide adequate coverage to the UE 104. The BS 102 and the UE 104 may communicate via a downlink radio frame 118, and an uplink radio frame 124 respectively. Each radio frame 118 / 124 may be further divided into sub-frames 120 / 127 which may include data symbols 122 / 128. In the present disclosure, the BS 102 and UE 104 are described herein as non-limiting examples of “communication nodes, ” generally, which can practice the methods disclosed herein. Such communication nodes may be capable of wireless and / or wired communications, in accordance with various embodiments of the present solution.
[0023] FIG. 2 illustrates a block diagram of an example wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM / OFDMA signals) in accordance with some embodiments of the present solution. The system 200 may include components and elements configured to support known or conventional operating features that need not be described in detail herein. In one illustrative embodiment, system 200 can be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment such as the wireless communication environment 100 of Figure 1, as described above.
[0024] System 200 generally includes a base station 202 (hereinafter “BS 202” ) and a user equipment device 204 (hereinafter “UE 204” ) . The BS 202 includes a BS (base station) transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each module being coupled and interconnected with one another as necessary via a data communication bus 220. The UE 204 includes a UE (user equipment) transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each module being coupled and interconnected with one another as necessary via a data communication bus 240. The BS 202 communicates with the UE 204 via a communication channel 250, which can be any wireless channel or other medium suitable for transmission of data as described herein.
[0025] As would be understood by persons of ordinary skill in the art, system 200 may further include any number of modules other than the modules shown in Figure 2. Those skilled in the art will understand that the various illustrative blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein may be implemented in hardware, computer-readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software can depend upon the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a suitable manner for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present disclosure
[0026] In accordance with some embodiments, the UE transceiver 230 may be referred to herein as an "uplink" transceiver 230 that includes a radio frequency (RF) transmitter and a RF receiver each comprising circuitry that is coupled to the antenna 232. A duplex switch (not shown) may alternatively couple the uplink transmitter or receiver to the uplink antenna in time duplex fashion. Similarly, in accordance with some embodiments, the BS transceiver 210 may be referred to herein as a "downlink" transceiver 210 that includes a RF transmitter and a RF receiver each comprising circuity that is coupled to the antenna 212. A downlink duplex switch may alternatively couple the downlink transmitter or receiver to the downlink antenna 212 in time duplex fashion. The operations of the two transceiver modules 210 and 230 may be coordinated in time such that the uplink receiver circuitry is coupled to the uplink antenna 232 for reception of transmissions over the wireless transmission link 250 at the same time that the downlink transmitter is coupled to the downlink antenna 212. Conversely, the operations of the two transceivers 210 and 230 may be coordinated in time such that the downlink receiver is coupled to the downlink antenna 212 for reception of transmissions over the wireless transmission link 250 at the same time that the uplink transmitter is coupled to the uplink antenna 232. In some embodiments, there is close time synchronization with a minimal guard time between changes in duplex direction.
[0027] The UE transceiver 230 and the base station transceiver 210 are configured to communicate via the wireless data communication link 250, and cooperate with a suitably configured RF antenna arrangement 212 / 232 that can support a particular wireless communication protocol and modulation scheme. In some illustrative embodiments, the UE transceiver 210 and the base station transceiver 210 are configured to support industry standards such as the Long Term Evolution (LTE) and emerging 5G standards, and the like. It is understood, however, that the present disclosure is not necessarily limited in application to a particular standard and associated protocols. Rather, the UE transceiver 230 and the base station transceiver 210 may be configured to support alternate, or additional, wireless data communication protocols, including future standards or variations thereof.
[0028] In accordance with various embodiments, the BS 202 may be an evolved node B (eNB) , a serving eNB, a target eNB, a femto station, or a pico station, for example. In some embodiments, the UE 204 may be embodied in various types of user devices such as a mobile phone, a smart phone, a personal digital assistant (PDA) , tablet, laptop computer, wearable computing device, etc. The processor modules 214 and 236 may be implemented, or realized, with a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. In this manner, a processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, or the like. A processor may also be implemented as a combination of computing devices, e.g., a combination of a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other such configuration.
[0029] Furthermore, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in firmware, in a software module executed by processor modules 214 and 236, respectively, or in any practical combination thereof. The memory modules 216 and 234 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In this regard, memory modules 216 and 234 may be coupled to the processor modules 210 and 230, respectively, such that the processors modules 210 and 230 can read information from, and write information to, memory modules 216 and 234, respectively. The memory modules 216 and 234 may also be integrated into their respective processor modules 210 and 230. In some embodiments, the memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by processor modules 210 and 230, respectively. Memory modules 216 and 234 may also each include non-volatile memory for storing instructions to be executed by the processor modules 210 and 230, respectively.
[0030] The network communication module 218 generally represents the hardware, software, firmware, processing logic, and / or other components of the base station 202 that enable bi-directional communication between base station transceiver 210 and other network components and communication nodes configured to communication with the base station 202. For example, network communication module 218 may be configured to support internet or WiMAX traffic. In a typical deployment, without limitation, network communication module 218 provides an 802.3 Ethernet interface such that base station transceiver 210 can communicate with a conventional Ethernet based computer network. In this manner, the network communication module 218 may include a physical interface for connection to the computer network (e.g., Mobile Switching Center (MSC) ) . The terms “configured for, ” “configured to” and conjugations thereof, as used herein with respect to a specified operation or function, refer to a device, component, circuit, structure, machine, signal, etc., that is physically constructed, programmed, formatted and / or arranged to perform the specified operation or function.
[0031] The Open Systems Interconnection (OSI) Model (referred to herein as, “open system interconnection model” ) is a conceptual and logical layout that defines network communication used by systems (e.g., wireless communication device, wireless communication node) open to interconnection and communication with other systems. The model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI Model also defines a logical network and effectively describes computer packet transfer by using different layer protocols. The OSI Model may also be referred to as the seven-layer OSI Model or the seven-layer model. In some embodiments, a first layer may be a physical layer. In some embodiments, a second layer may be a Medium Access Control (MAC) layer. In some embodiments, a third layer may be a Radio Link Control (RLC) layer. In some embodiments, a fourth layer may be a Packet Data Convergence Protocol (PDCP) layer. In some embodiments, a fifth layer may be a Radio Resource Control (RRC) layer. In some embodiments, a sixth layer may be a Non Access Stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer being the other layer.
[0032] Various example embodiments of the present solution are described below with reference to the accompanying figures to enable a person of ordinary skill in the art to make and use the present solution. As would be apparent to those of ordinary skill in the art, after reading the present disclosure, various changes or modifications to the examples described herein can be made without departing from the scope of the present solution. Thus, the present solution is not limited to the example embodiments and applications described and illustrated herein. Additionally, the specific order or hierarchy of steps in the methods disclosed herein are merely example approaches. Based upon design preferences, the specific order or hierarchy of steps of the disclosed methods or processes can be re-arranged while remaining within the scope of the present solution. Thus, those of ordinary skill in the art will understand that the methods and techniques disclosed herein present various steps or acts in a sample order, and the present solution is not limited to the specific order or hierarchy presented unless expressly stated otherwise.
[0033] 2. Systems and Methods for Common Signal / Channel Reception
[0034] To expand the utilization of new radio (NR) access technologies, 5G / 6G connectivity via satellites and / or airborne vehicles can be used. NR-non-terrestrial networks (NTN) and internet of things (IoT) -NTN can be supported. To offer optimized performance especially when addressing handset terminals (including smartphones with -5.5 dBi antenna gain) with respect to downlink (DL) coverage, DL coverage enhancements can be utilized to accommodate satellite payload constraints, e.g., limited transmission power and beamforming gain gap (or steering loss) between nadir beam and edge beams.
[0035] In addition, in terrestrial networks (TN) , as the wireless communication system moves to higher frequencies, propagation conditions may degrade compared to lower frequencies exacerbating the coverage challenges. As a result, the DL coverage may be more difficult, especially for common channels those are generally transmitted with wide beams.
[0036] For the viewpoint of link level enhancement, repetition in physical signals / channels (e.g., physical downlink shared channel (PDSCH) ) transmission can be considered to improve link margin. Taking a PDSCH as an example, both common and UE-specific transmission can be supported. Common transmissions may include system information, random access procedure related messages, and / or paging, which can be critical information for a user equipment (UE) to access the network and to keep correct DL synchronization. In the present disclosure, a downlink coverage enhancement based on repetition is performed.
[0037] At least of following common DL signals / channels can be transmitted to UEs, in which a PDSCH is scheduled by a physical downlink control channel (PDCCH) with common search space (CSS) .
[0038] Synchronization signal block (SSB) : The SSB can be used for cell search and DL synchronization.
[0039] Type0-physical downlink control channel (PDCCH) common search space (CSS) set: The Type0-PDCCH CSS set can be used to indicate time-frequency resource for system information block type 1 (SIB1) .
[0040] System information block type 1 (SIB1) : The SIB1 may contain / include remaining important system information of a cell. The SIB1 may contain / include a time-frequency resource indication for Type0A-PDCCH.
[0041] Type0A-physical downlink control channel (PDCCH) common search space (CSS) set: The Type0A-PDCCH CSS set can be used to indicate the time-frequency resource for system information block type x (SIBx) where x is a positive integer value, e.g., SIB19 for NTN.
[0042] System information block type 19 (SIB19) : The SIB19 may include / contain satellite assistance information for NTN access.
[0043] Type1-physical downlink control channel (PDCCH) common search space (CSS) set: The Type1-PDCCH CSS set can be used to carry downlink control information (DCI) for random access related PDSCH, e.g., MSG2, MSG4, MSGB in a random access channel (RACH) process.
[0044] Random access related physical downlink shared channel (PDSCH) : The random access related PDSCH may include / contain PDSCH carrying MSG2, MSG4, and / or MSGB.
[0045] Type2-physical downlink control channel (PDCCH) common search space (CSS) set: The Type2-PDCCH CSS set can be used to carry DCI for paging.
[0046] Paging: The paging can be used for notifications of one or more UEs.
[0047] Implementation Example 1: How does a UE determine whether repetition is used and the corresponding repetition number?
[0048] Case 1-1: SIB1 repetition
[0049] A wireless communication device (e.g., a user equipment (UE) ) may determine whether there is to be repetition in a common downlink (DL) channel to be received. The wireless communication device may perform reception of the common DL channel according to the determination. In some embodiments, a UE may determine whether repetition is used and the corresponding repetition number using at least one of following methods.
[0050] If / when / where the common DL channel to be received is the SIB1, whether there is to be repetition can be indicated (e.g., implicitly determined) according to a type (e.g., operating / situational context / category / mode) of the wireless communication device or a type of a network to be accessed by the wireless communication device. The type of the wireless communication device or the type of the network may correspond to: non-terrestrial network (NTN) or internet of things (IoT) . For example, if / where / when the repetition is used in a SIB1 transmission, the repetition can be implicitly indicated by a network / UE type.
[0051] a. For example, the UE type can be an NTN UE or the network to be accessed can be an NTN, which may be determined by the UE using global navigation satellite system (GNSS) information (e.g., the UE may determine itself is in an ocean or a desert) . The UE may expect repetition in a SIB1 transmission.
[0052] b. For another example, the UE type can be an IoT UE (e.g., which may be located in a basement with poor coverage) or the network to be accessed is a dedicated terrestrial network for special purpose (e.g., to support the IoT UEs with poor coverage) .
[0053] c. The applicable repetition number of SIB1 can be predefined, which can be a value or a value set. If / when a value (e.g., 4) is predefined, the UE may use the value in its SIB1 reception. If / when a value set (e.g., 2, 4, 8) is predefined, the UE may blindly try the values in its SIB1 reception. After the UE successfully accesses the network, the actual repetition number of SIB1 or other DL channels can be indicated / configured by the network using UE-specific signaling (e.g., radio resource control (RRC) / medium access control (MAC) / downlink control information (DCI) ) .
[0054] In some embodiments, if / when the common DL channel to be received is the SIB1, whether there is to be repetition can be determined according to an aggregation level of a corresponding physical downlink control channel (PDCCH) transmission. For example, if / when / where the repetition is used in a SIB1 transmission, the repetition can be indicated by aggregation level of corresponding PDCCH (e.g., Type0-PDCCH) .
[0055] A UE may determine the aggregation level of a PDCCH with blind decoding. A larger aggregation level may mean / indicate a worse channel condition. As a result, the corresponding PDSCH (carrying SIB1) may need repetition with a PDCCH using larger aggregation level.
[0056] a. The repetition number of the PDSCH can be the same as the aggregation level of the corresponding PDCCH.
[0057] b. The repetition number of the PDSCH can be determined by a repetition scaling factor (repSF) and the aggregation level of the corresponding PDCCH (AL) . The repSF can be a predefined value or indicated by a SIB1. A minimum and / or a maximum repetition number (minRep / maxRep) can be predefined or indicated by a SIB1.
[0058] a) The repetition number may be equal to floor (repSF*AL) or ceiling (repSF*AL) .
[0059] b) The repetition number may be equal to min (floor (repSF*AL) , maxRep) or min(ceiling (repSF*AL) , maxRep) .
[0060] c) The repetition number may be equal to max (floor (repSF*AL) , minRep) or max(ceiling (repSF*AL) , minRep) .
[0061] d) A repetition number of zero or one may mean / indicate no repetition.
[0062] c. The repetition number of the PDSCH can be determined by a mapping to the aggregation level of the corresponding PDCCH. For example, for the aggregation level of {1, 2, 4, 8, 16} , a predefined repetition number of {4, 4, 4, 16, 16} can be used. The mapping can also be represented / expressed / implemented as a rule, e.g., the aggregation level ranges of {1, 2, 4} and {8, 16} are mapped to the repetition number of 4 and 16, respectively.
[0063] In some embodiments, if / where / when the common DL channel to be received is the SIB1, a repetition number of the repetition can be indicated in a physical downlink control channel (PDCCH) transmission or in a master information block (MIB) signaling. For example, if the repetition is used in a SIB1 transmission, the repetition can be indicated in corresponding PDCCH or in MIB. For example, an indication can be added in MIB. The indication can be a bit flag or a field for repetition number.
[0064] a. If / where / when a bit flag is used (e.g., 1 for repetition used, 0 for no repetition) , the UE may expect repetition in SIB1 transmission if / when the bit flag is 1. The applicable repetition number of SIB1 can be predefined, which can be a value or a value set. If / where / when a value (e.g., 4) is predefined, the UE may use the value in its SIB1 reception. If / when / where a value set (e.g., 2, 4, 8) is predefined, the UE may blindly try (e.g., via blind detection) the values in its SIB1 reception. After the UE successfully accesses the network, the actual repetition number of SIB1 or other DL channels can be indicated / configured by the network using UE-specific signaling (e.g., RRC / MAC / DCI) .
[0065] b. If / where / when a field for repetition number is used, the field can be a repetition number or a repetition number index. For example, the value in the field can be {0, 1, 2, 3} for the repetition number of {1, 2, 3, 4} , respectively, if / where / when a 2-bit field is used. For another example, a repetition number set (e.g., {1, 2, 4, 8} ) can be predefined in the specification. In some embodiments, the index {0, 1, 2, 3} can be provided in the field for the repetition number of {1, 2, 4, 8} , respectively.
[0066] Case 1-2: SIBx repetition
[0067] A wireless communication device (e.g., a user equipment (UE) ) may determine whether there is to be repetition in a common downlink (DL) channel to be received. The wireless communication device may perform reception of the common DL channel according to the determination. In some embodiments, a UE may determine whether repetition is used and the corresponding repetition number using at least one of following methods.
[0068] If / when / where the common DL channel to be received is the SIBx, whether there is to be repetition can be indicated according to a type of the wireless communication device or a type of a network to be accessed by the wireless communication device. The type of the wireless communication device or the type of the network may correspond to: non-terrestrial network (NTN) or internet of things (IoT) . For example, if / where / when the repetition is used in a SIBx transmission, the repetition can be indicated by a network / UE type. The method is the same as that in the Case 1-1 SIB1 repetition indicated by network / UE type part. The only change may be that the method is applicable to one or more predefined SI (e.g., the SI with index=0) or one or more predefined SIBx (e.g., SIB19 for NTN) .
[0069] In some embodiments, if / where / when the common DL channel to be received is the SIBx, a repetition number of the repetition can be indicated in a physical downlink control channel (PDCCH) transmission or a system information block type 1 (SIB1) signaling. For example, if / where / when the repetition is used in a SIBx transmission, the repetition can be indicated in corresponding PDCCH or in SIB1 with a new indication.
[0070] a. The repetition can be indicated based on SI, which may include one or more SIBx.
[0071] a) The indication can be a bit flag applicable for a specific SI (e.g., the SI with index=0) , a set of SI or all SI, which may need to be predefined. The method is the same as that in the Case 1-1 SIB1 repetition indicated in corresponding PDCCH or in MIB part. The only change is that SIB1 is replaced by the applicable SI, and the MIB is replaced by SIB1.
[0072] b) The indication can be a field in a format of {SI index, repetition number} , or a list of {SI index, repetition number} for multiple SI. The format can also be one or more {SI index, repetition number index} , which can be used to select a repetition number from a predefined repetition number set.
[0073] c) The indication can be a field in a format of {SI index1, SI index2, ... SI indexN, repetition number} , or a list of {SI index1, SI index2, ... SI indexN, repetition number} with possible different repetition number for multiple SI. The format can also be one or more {SI index1, SI index2, ... SI indexN, repetition number index} , which can be used to select a repetition number from a predefined repetition number set.
[0074] b. The repetition is indicated based on SIBx (e.g., a specific SIBx like SIB19 for NTN, a set of SIBx or all SIBx) , which may need to be predefined in specification. The method is the same as that in the Case 1-1 SIB1 repetition indicated in corresponding PDCCH or in MIB partCase 1-1 SIB1 repetition indicated by MIB part. The only change is the applicable SIBx, and the MIB is replaced by SIB1.
[0075] c. If / when / where the repetition is used in SIBx transmission, the repetition can be indicated by an aggregation level of corresponding PDCCH (e.g., Type0A-PDCCH) . The method is the same as that in the Case 1-1 SIB1 repetition indicated by aggregation level of corresponding PDCCH part. The only change is the applicable SIBx, and the MIB is replaced by a SIB1.
[0076] If / where / when the repetition is used in a SIBx transmission, the repetition can follow the repetition of SIB1. In other words, after successfully decoding of SIB1, the UE may determine whether SIB1 repetition is used and the corresponding repetition number. Then the UE may use the same repetition assumption for SIBx reception. The applicable SI (e.g., SI index) or SIBx (e.g., SIB index) can be predefined. For example, it can be predefined that the SI with index 0 repetition follows the SIB1 repetition with the same repetition number.
[0077] Case 1-3: Random access related PDSCH repetition
[0078] A wireless communication device (e.g., a user equipment (UE) ) may determine whether there is to be repetition in a common downlink (DL) channel to be received. The wireless communication device may perform reception of the common DL channel according to the determination. In some embodiments, a UE may determine whether repetition is used and the corresponding repetition number using at least one of following methods. The random access related PDSCH may include MSG2, MSG4, and / or MSGB. The method described below can be applied to one or more of MSG2, MSG4, or MSGB.
[0079] If / where / when the common DL channel to be received is the SIB1, whether there is to be repetition can be indicated according to a type of the wireless communication device or a type of a network to be accessed by the wireless communication device. The type of the wireless communication device or the type of the network may correspond to: non-terrestrial network (NTN) or internet of things (IoT) . For example, if / where / when the repetition is used in a random access related PDSCH transmission, the repetition can be indicated by a network / UE type. The method is the same as that in the Case 1-1 SIB1 repetition indicated by network / UE type part. The only change is the method is applicable to random access related PDSCH. The repetition can be applied to PDSCH carrying MSG2, MSG4, and / or MSGB, which is predefined.
[0080] If / where / when the repetition is used in a random access related PDSCH transmission, the repetition can be indicated in corresponding PDCCH or SIB1 or SIBx (e.g., SIB19 for NTN) with a new indication. For example, an indication can be added in SIB1 or SIB19. The indication can be a bit flag or a field for repetition number.
[0081] a. If / where / when a bit flag is used (e.g., 1 for repetition used, 0 for no repetition) , the UE may expect repetition in random access related PDSCH transmission if the bit flag is 1. The repetition can be applied to PDSCH carrying MSG2, MSG4, and / or MSGB, which can be predefined. The applicable repetition number can be predefined in specification, which can be a value or a value set. If a value (e.g., 4) is predefined, the UE may use the value in the applicable random access related PDSCH (as predefined) reception. If a value set (e.g., 2, 4, 8) is predefined, the UE may blindly try the values in the applicable random access related PDSCH reception.
[0082] b. If / where / when a field for repetition number is used, the field can be a repetition number or a repetition number index. The repetition can be applied to PDSCH carrying MSG2, MSG4, and / or MSGB, which is predefined in specification. For example, the value in the field can be {0, 1, 2, 3} for the repetition number of {1, 2, 3, 4} , respectively, if a 2-bit field is used. For another example, a repetition number set (e.g., {1, 2, 4, 8} ) can be predefined in the specification. In some embodiments, the index {0, 1, 2, 3} can be provided in the field for the repetition number of {1, 2, 4, 8} , respectively. If / when the repetition number for MSG2, MSG4, and MSGB is different, separate fields can be used for one or more PDSCH. The repetition number indication can use the method above within each field.
[0083] c. After the UE successfully accesses the network, the actual repetition number of applicable random access related PDSCH for following usage (e.g., handover related random access) can be indicated / configured by the network using UE-specific signaling (e.g., RRC / MAC / DCI) .
[0084] If / where / when the repetition is used in a random access related PDSCH transmission, the repetition can be indicated by aggregation level of corresponding PDCCH. The method is the same as that in the Case 1-1 SIB1 repetition indicated by aggregation level of corresponding PDCCH part. The only change is that the PDCCH for random access related PDSCH is Type1-PDCCH.
[0085] If / where / when the repetition is used in a random access related PDSCH transmission, the repetition can be follow the repetition of SIB1 or (a specific) SIBx. In other words, after successfully decoding of SIB1 or (a specific) SI / SIBx, the UE may determine whether SIB1 or (a specific) SI / SIBx repetition is used and the corresponding repetition number. Then the UE uses the same repetition assumption for random access related PDSCH reception. The associated SI (e.g., SI index) or SIBx (e.g., SIB index) can be predefined in specification. The associated random access related PDSCH (e.g., one or more of MSG2, MSG4, MSGB) can be predefined in specification. The association between the SI / SIBx and the random access related PDSCH can be predefined. For example, it can be predefined that the MSG4 repetition follows the SIB1 repetition with the same repetition number.
[0086] Case 1-4: Paging repetition
[0087] A wireless communication device (e.g., a user equipment (UE) ) may determine whether there is to be repetition in a common downlink (DL) channel to be received. The wireless communication device may perform reception of the common DL channel according to the determination. In some embodiments, a UE may determine whether repetition is used and the corresponding repetition number using at least one of following methods. For example, paging configuration can be provided by the network to a UE, after the UE successfully accesses the network. Then whether paging repetition is used and corresponding repetition number can be indicated / configured by the network, e.g., using UE-specific signaling (e.g., RRC / MAC / DCI) .
[0088] The repetition can be indicated by aggregation level of corresponding PDCCH (e.g., Type2-PDCCH) . The method can be the same as that in the Case 1-1 SIB1 repetition indicated by aggregation level of corresponding PDCCH part.
[0089] The repetition can be indicated in corresponding PDCCH (a new field in DCI format 1_0 in Type2-PDCCH) . The method can be the same as that in the Case 1-1 SIB1 repetition indicated in corresponding PDCCH or in MIB part.
[0090] If / where / when the repetition is used in paging transmission, the repetition can follow the repetition of another DL signal / channel repetition. The DL signal / channel can be SIB1, SI / SIBx, random access related PDSCH, and / or other UE-specific DL signal / channel.
[0091] Implementation Example 2: How does a UE determine the time-frequency resource used for repetition?
[0092] For a PDSCH repetition transmission, a time-frequency resource used for repetition can be known by the UE.
[0093] In some embodiments, if / where / when the common DL channel to be received includes at least one of: the SIB1 or the SIBx, the reception can be performed in a plurality of consecutive slots using a same time-frequency resource. A time duration of the SIBx repetition is shorter than or equal to a time duration of a system information (SI) scheduling window. For SIB1 and SIBx transmission, the time-frequency resource (to be used) can be indicated in Type0-PDCCH and Type0A-PDCCH, respectively. If / where / when a UE is not configured a Type0A-PDCCH common search space (CSS) , the UE may use the Type0-PDCCH CSS for Type0A-PDCCH. If / where / when SIB1 and / or SIBx repetition is used, the same time-frequency resource can be applied in consecutive slots. The first slot is the one used for SIB1 and / or SIBx transmission without repetition. The number of consecutive slots equals to the repetition number. For a SIBx, the whole time length of the repetition can be shorter than or equal to the length of the SI scheduling window (called si-windowlength) , which may indicate / mean that a UE assumes the SI repetition is not longer than one SI scheduling window.
[0094] In some embodiments , if / where / when the common DL channel to be received is a random access related PDSCH transmission, the reception can be performed in a plurality of consecutive slots using a same time-frequency resource. A time duration of the random access related PDSCH repetition can be shorter than or equal to a time duration of a MSG2 random access response (RAR) window. For random access related PDSCH, the used time-frequency resource can be indicated in Type1-PDCCH. If / where / when random access related PDSCH repetition is used, the same time-frequency resource can be applied in consecutive slots. The first slot is the one used for random access related PDSCH transmission without repetition. The number of consecutive slots can be equal to the repetition number. The repetition can be shorter than or equal to the length of MSG2 (RAR) window (e.g., referred to as ra-ResponseWindow) , which may indicate / mean that a UE assumes the random access related PDSCH repetition is not longer than one RAR window.
[0095] In some embodiments, if / where / when the common DL channel to be received is the paging, the reception can be performed in a plurality of consecutive slots using a same time- frequency resource. A time duration of the paging with repetition can be shorter than or equal to a discontinuous reception (DRX) cycle or an extended DRX cycle. For paging, the used time-frequency resource can be indicated in Type2-PDCCH. If / where / when a UE is not configured a Type2-PDCCH CSS, it uses the Type0-PDCCH CSS for Type2-PDCCH. If / where / when paging repetition is used, the same time-frequency resource can be applied in consecutive slots. The first slot can be the one used for paging transmission without repetition. The number of consecutive slots can be equal to the repetition number. A UE may monitor one paging occasion (PO) per DRX or eDRX cycle. A UE may assume the paging (with repetition) for all actual transmitted SSBs is not longer than one DRX or eDRX cycle.
[0096] For all DL signals / channels mentioned above, the time-frequency resource without repetition is assumed to be no longer than a slot. The repetition can be carried out in consecutive slots. If the time-frequency resource without repetition covers multiple slots or other time unit, a general term “resource unit” can be used to describe the time-frequency resource granularity. In such case, the repetition can be carried out in consecutive resource units, which can be at least one of symbol / slot / mini-slot / subframe / radio frame. In other words, the resource for repetition may depend on the resource unit.
[0097] Implementation Example 3: How does a UE deal with collision with other DL transmission?
[0098] For a PDSCH repetition transmission, if the time-frequency resource used for repetition collides with other DL transmission, the UE reception may follow one or more rules described below.
[0099] In some embodiments, if the common DL channel to be received includes at least one of: the random access related PDSCH transmission or the paging, the wireless communication device may skip a time-frequency resource that overlaps with that used for another common channel and can resume the reception after the time-frequency resource. In certain embodiments , the time-frequency resource that is skipped can be counted towards meeting a repetition factor to complete the repetition. In certain embodiments, the time-frequency resource that is skipped may not be counted towards meeting a repetition factor to complete the repetition.
[0100] For SIB1 and SIBx transmission, the UE may not expect the time-frequency resource used for repetition to collide with other DL transmission.
[0101] For random access related PDSCH and paging, the time-frequency resource used for repetition may collide with the time-frequency resource used for other common channels (e.g., SSB, Type0-PDCCH, SIB1, Type0A-PDCCH, SIBx) . In such case, the action of UE can be:
[0102] a. The UE may skip the collided time-frequency resource used for the other common channels and continue its reception, until all repetitions (e.g., indicated by the repetition number) are received. In other words, the number of consecutive slots can be equal to the repetition number, which may not include the slots with overlapped time-frequency resource with the other common channels.
[0103] b. The UE may skip the collided time-frequency resource used for the other common channels and can count the collided time-frequency resource in the whole repetition resource. In other words, the number of consecutive slots can be equal to the repetition number, which includes the slots with overlapped time-frequency resource with the other common channels.
[0104] It should be understood that one or more features from the above / following implementation examples are not exclusive to the specific implementation examples, but can be combined in any manner (e.g., in any priority and / or order, concurrently or otherwise) .
[0105] FIG. 4 illustrates a flow diagram of a method 400 for common signal reception. The method 400 may be implemented using any one or more of the components and devices detailed herein in conjunction with FIGs. 1–3. In overview, the method 400 may be performed by a UE, in some embodiments. Additional, fewer, or different operations may be performed in the method 400 depending on the embodiment. At least one aspect of the operations is directed to a system, method, apparatus, or a computer-readable medium.
[0106] A wireless communication device (e.g., a user equipment (UE) ) may determine whether there is to be repetition in a common downlink (DL) channel to be received. The wireless communication device may perform reception of the common DL channel according to the determination. In some embodiments, the common DL channel to be received can be at least one of: a system information block type 1 (SIB1) ; a system information block type x (SIBx) where x is a positive integer value; a random access related physical downlink shared channel (PDSCH) transmission; or a paging.
[0107] In some embodiments, if the common DL channel to be received is the SIB1, the SIBx, or the random access related PDSCH transmission, whether there is to be repetition can be indicated according to a type (e.g., operating context / situation / mode) of the wireless communication device or a type (e.g., operating context / situation / mode) of a network to be accessed by the wireless communication device. The type of the wireless communication device or the type of the network may correspond to: non-terrestrial network (NTN) or internet of things (IoT) . In some embodiments, a repetition number of the repetition can be a defined value or can be in a defined set of values. In some embodiments, the wireless communication device may receive an indication of a repetition number to be used after successfully accessing the network.
[0108] In some embodiments, if (e.g., when, where) the common DL channel to be received is the SIB1, the SIBx, the random access related PDSCH transmission, or the paging, whether there is to be repetition can be determined according to an aggregation level of a corresponding physical downlink control channel (PDCCH) transmission. In some embodiments, a repetition number of the repetition can be same as the aggregation level of the corresponding PDCCH transmission.
[0109] In some embodiments, the wireless communication device may determine a repetition number of the repetition according to a repetition scaling factor and the aggregation level of the corresponding PDCCH transmission. In some embodiments, the wireless communication device may determine a repetition number of the repetition to be a value mapped to the aggregation level of the corresponding PDCCH transmission, or mapped to a range within which the aggregation level resides.
[0110] In some embodiments, if the common DL channel to be received is the SIB1, the SIBx, the random access related PDSCH transmission, or the paging, a repetition number of the repetition can be indicated in a physical downlink control channel (PDCCH) transmission, a master information block (MIB) signaling, a system information (SI) signaling, or a system information block type 1 (SIB1) signaling. In some embodiments, whether there is to be repetition can be indicated by a bit flag or a field.
[0111] In some embodiments, at least one of: if the bit flag has a first value, there is to be repetition; if the bit flag is a second value, there is no repetition; if there is to be repetition, the repetition number is a defined value or is in a defined set of values; or after successfully accessing the network, the wireless communication device receives an indication of the repetition number to be used. In some embodiments, the field may comprise the repetition number or an index of the repetition number. In some embodiments, the field can be in a format of {SI index, repetition number} , a list of {SI index, repetition number} , a format of {SI index1, SI index2, …SI indexN, repetition number} , or a list of {SI index1, SI index2, …SI indexN, repetition number} .
[0112] In some embodiments, if the common DL channel to be received is the SIBx, whether there is to be repetition can be after a repetition of SIB1. In some embodiments, if the common DL channel to be received is the random access related PDSCH transmission, whether there is to be repetition can be after a repetition of SIB1 or a repetition of SIBx.
[0113] In some embodiments, if the common DL channel to be received is the paging, whether there is to be repetition can be after a repetition of other / another DL channel. In some embodiments, if the common DL channel to be received includes at least one of: the SIB1 or the SIBx, the reception can be performed in a plurality of consecutive slots using a same time-frequency resource, wherein a time duration of the SIBx repetition is shorter than or equal to a time duration of a system information (SI) scheduling window.
[0114] In some embodiments, if the common DL channel to be received is a random access related PDSCH transmission, the reception can be performed in a plurality of consecutive slots using a same time-frequency resource. A time duration of the random access related PDSCH repetition can be shorter than or equal to a time duration of a MSG2 random access response (RAR) window. In some embodiments, if the common DL channel to be received is the paging, the reception can be performed in a plurality of consecutive slots using a same time-frequency resource. A time duration of the paging with repetition can be shorter than or equal to a discontinuous reception (DRX) cycle or an extended DRX cycle.
[0115] In some embodiments, if (e.g., when, where) the common DL channel to be received includes at least one of: the random access related PDSCH transmission or the paging, the wireless communication device may skip a time-frequency resource that overlaps with that used for another common channel and resumes the reception after the time-frequency resource. In certain embodiments, the time-frequency resource that is skipped can be counted towards meeting a repetition factor to complete the repetition. In certain embodiments, the time-frequency resource that is skipped may not be counted towards meeting a repetition factor to complete the repetition.
[0116] In some embodiments, a wireless communication node (e.g., a base station (BS) ) may transmit a common downlink (DL) channel to a wireless communication device (e.g., a user equipment (UE) ) . A wireless communication device may determine whether there is to be repetition in the common DL channel to be received.
[0117] While various embodiments of the present solution have been described above, it should be understood that they have been presented by way of example only, and not by way of limitation. Likewise, the various diagrams may depict an example architectural or configuration, which are provided to enable persons of ordinary skill in the art to understand example features and functions of the present solution. Such persons would understand, however, that the solution is not restricted to the illustrated example architectures or configurations, but can be implemented using a variety of alternative architectures and configurations. Additionally, as would be understood by persons of ordinary skill in the art, one or more features of one embodiment can be combined with one or more features of another embodiment described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the above-described illustrative embodiments.
[0118] It is also understood that any reference to an element herein using a designation such as "first, " "second, " and so forth does not generally limit the quantity or order of those elements. Rather, these designations can be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some manner.
[0119] Additionally, a person having ordinary skill in the art would understand that information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits and symbols, for example, which may be referenced in the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0120] A person of ordinary skill in the art would further appreciate that any of the various illustrative logical blocks, modules, processors, means, circuits, methods and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two) , firmware, various forms of program or design code incorporating instructions (which can be referred to herein, for convenience, as "software" or a "software module) , or any combination of these techniques. To clearly illustrate this interchangeability of hardware, firmware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware or software, or a combination of these techniques, depends upon the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in various ways for each particular application, but such implementation decisions do not cause a departure from the scope of the present disclosure.
[0121] Furthermore, a person of ordinary skill in the art would understand that various illustrative logical blocks, modules, devices, components and circuits described herein can be implemented within or performed by an integrated circuit (IC) that can include 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 device, or any combination thereof. The logical blocks, modules, and circuits can further include antennas and / or transceivers to communicate with various components within the network or within the device. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, or state machine. A processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other suitable configuration to perform the functions described herein.
[0122] If implemented in software, the functions can be stored as one or more instructions or code on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein can be implemented as software stored on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program or code from one place to another. A storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
[0123] In this document, the term "module" as used herein, refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purpose of discussion, the various modules are described as discrete modules; however, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions according embodiments of the present solution.
[0124] Additionally, memory or other storage, as well as communication components, may be employed in embodiments of the present solution. It will be appreciated that, for clarity purposes, the above description has described embodiments of the present solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the present solution. For example, functionality illustrated to be performed by separate processing logic elements, or controllers, may be performed by the same processing logic element, or controller. Hence, references to specific functional units are only references to a suitable means for providing the described functionality, rather than indicative of a strict logical or physical structure or organization.
[0125] Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of this disclosure. Thus, the disclosure is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as recited in the claims below.
Claims
1.A method comprising:determining, by a wireless communication device, whether there is to be repetition in a common downlink (DL) channel to be received; andperforming, by the wireless communication device, reception of the common DL channel according to the determination.2.The method of claim 1, wherein the common DL channel to be received is at least one of:a system information block type 1 (SIB1) ;a system information block type x (SIBx) , where x is a positive integer value;a random access related physical downlink shared channel (PDSCH) transmission; ora paging.3.The method of claim 2, wherein if the common DL channel to be received is the SIB1, the SIBx, or the random access related PDSCH transmission, whether there is to be repetition is indicated according to a type of the wireless communication device or a type of a network to be accessed by the wireless communication device.4.The method of claim 3, wherein the type of the wireless communication device or the type of the network corresponds to: non-terrestrial network (NTN) or internet of things (IoT) .5.The method of claim 3, wherein a repetition number of the repetition is a defined value or is in a defined set of values.6.The method of claim 5, comprising:receiving, by the wireless communication device after successfully accessing the network, an indication of a repetition number to be used.7.The method of claim 2, wherein if the common DL channel to be received is the SIB1, the SIBx, the random access related PDSCH transmission, or the paging, whether there is to be repetition is determined according to an aggregation level of a corresponding physical downlink control channel (PDCCH) transmission.8.The method of claim 7, wherein a repetition number of the repetition is same as the aggregation level of the corresponding PDCCH transmission.9.The method of claim 7, comprising:determining, by the wireless communication device, a repetition number of the repetition according to a repetition scaling factor and the aggregation level of the corresponding PDCCH transmission.10.The method of claim 7, comprising:determining, by the wireless communication device, a repetition number of the repetition to be a value mapped to the aggregation level of the corresponding PDCCH transmission, or mapped to a range within which the aggregation level resides.11.The method of claim 2, wherein if the common DL channel to be received is the SIB1, the SIBx, the random access related PDSCH transmission, or the paging, a repetition number of the repetition is indicated in a physical downlink control channel (PDCCH) transmission, a master information block (MIB) signaling, a system information (SI) signaling, or a system information block type 1 (SIB1) signaling.12.The method of claim 11, wherein whether there is to be repetition is indicated by a bit flag or a field.13.The method of claim 12, wherein at least one of:if the bit flag has a first value, there is to be repetition;if the bit flag is a second value, there is no repetition;if there is to be repetition, the repetition number is a defined value or is in a defined set of values; orafter successfully accessing the network, the wireless communication device receives an indication of the repetition number to be used.14.The method of claim 12, wherein the field comprises the repetition number or an index of the repetition number.15.The method of claim 12, wherein the field is in a format of {SI index, repetition number} , a list of {SI index, repetition number} , a format of {SI index1, SI index2, …SI indexN, repetition number} , or a list of {SI index1, SI index2, …SI indexN, repetition number} .16.The method of claim 2, wherein if the common DL channel to be received is the SIBx, whether there is to be repetition is after a repetition of SIB1.17.The method of claim 2, wherein if the common DL channel to be received is the random access related PDSCH transmission, whether there is to be repetition is after a repetition of SIB1 or a repetition of SIBx.18.The method of claim 2, wherein if the common DL channel to be received is the paging, whether there is to be repetition is after a repetition of other DL channel.19.The method of claim 2, wherein when the common DL channel to be received includes at least one of: the SIB1 or the SIBx, the reception is performed in a plurality of consecutive slots using a same time-frequency resource, wherein a time duration of the SIBx repetition is shorter than or equal to a time duration of a system information (SI) scheduling window.20.The method of claim 2, wherein when the common DL channel to be received is a random access related PDSCH transmission, the reception is performed in a plurality of consecutive slots using a same time-frequency resource, wherein a time duration of the random access related PDSCH repetition is shorter than or equal to a time duration of a MSG2 random access response (RAR) window.21.The method of claim 2, wherein when the common DL channel to be received is the paging, the reception is performed in a plurality of consecutive slots using a same time-frequency resource, wherein a time duration of the paging with repetition is shorter than or equal to a discontinuous reception (DRX) cycle or an extended DRX cycle.22.The method of claim 2, wherein when the common DL channel to be received includes at least one of: the random access related PDSCH transmission or the paging, the wireless communication device skips a time-frequency resource that overlaps with that used for another common channel and resumes the reception after the time-frequency resource.23.The method of claim 22, wherein the time-frequency resource that is skipped is counted towards meeting a repetition factor to complete the repetition.24.The method of claim 22, wherein the time-frequency resource that is skipped is not counted towards meeting a repetition factor to complete the repetition.25.A method comprising:transmitting, by a wireless communication node to a wireless communication device, a common downlink (DL) channel, wherein a wireless communication device determines whether there is to be repetition in the common DL channel to be received.26.A non-transitory computer readable medium storing instructions, which when executed by at least one processor, cause the at least one processor to perform the method of any one of claims 1-25.27.An apparatus comprising:at least one processor configured to perform the method of any one of claims 1-25.
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