Repetition for coverage enhancement
By configuring and indicating PDSCH repetitions through repurposed DCI fields, the solution addresses limited SIB reception, enhancing coverage and compatibility in communication networks.
Patent Information
- Application Number
- PCT/CN2024/086193
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-04
- Publication Date
- 2025-10-09
AI Technical Summary
Existing communication networks face challenges in ensuring reliable reception of System Information Blocks (SIB) due to limited coverage, particularly in scenarios where UEs have reduced capabilities for receiving downlink transmissions, necessitating improved repetition mechanisms for PDSCH to enhance coverage without compromising backwards compatibility.
A configuration mechanism is provided for scheduling and performing repetitions of SIB on the Physical Downlink Shared Channel (PDSCH), utilizing repurposed modulation and coding scheme fields, reserved bits, or MIB fields in DCI to indicate the number of repetitions, ensuring compatibility with existing protocols.
Enhances the reliability of SIB reception by allowing UEs to combine repeated transmissions, improving coverage and maintaining compatibility with existing network operations.
Smart Images

Figure CN2024086193_09102025_PF_FP_ABST
Abstract
Description
REPETITION FOR COVERAGE ENHANCEMENTFIELDVarious example embodiments relate to the field of telecommunication and in particular, to a terminal device, a network device, methods, apparatuses, and a computer readable storage medium for coverage enhancement.BACKGROUNDA communication network can be seen as a facility that enables communications between two or more communication devices or provides communication devices access to a data network. A mobile or wireless communication network is one example of a communication network.Such communication networks operate in accordance with standards, such as those promulgated by 3GPP (Third Generation Partnership Project) or ETSI (European Telecommunications Standards Institute) . Examples of such standards include the so-called 5G (5th Generation) standard or other standards promulgated by 3GPP.SUMMARYIn general, example embodiments of the present disclosure provide a solution for coverage enhancement, especially with a repetition mechanism.In a first aspect, there is provided a terminal device. The terminal device includes at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the terminal device at least to: receive (210, 530, 630) , from a network device (120) , a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; and perform (250, 580, 680) , based on the configuration, at least one repetition reception (320-1 to 320-3) of the SIB carried on the PDSCH.In a second aspect, there is provided a network device. The network device includes at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the network device at least to: transmit (210, 530, 630) , to a terminal device (110) , a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; and perform (240) , based on the configuration, at least one repetition transmission of the SIB carried on the PDSCH.In a third aspect, there is provided a method. The method includes receiving, at a terminal device and from a network device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; and performing, based on the configuration, at least one repetition reception of the SIB carried on the PDSCH.In a fourth aspect, there is provided a method. The method includes transmitting, at a network device and to a terminal device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; and performing, based on the configuration, at least one repetition transmission of the SIB carried on the PDSCH.In a fifth aspect, there is provided an apparatus. The apparatus includes means for receiving, at a terminal device and from a network device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; and means for performing, based on the configuration, at least one repetition reception of the SIB carried on the PDSCH.In a sixth aspect, there is provided an apparatus. The apparatus includes means for transmitting, at a network device and to a terminal device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; and means for performing, based on the configuration, at least one repetition transmission of the SIB carried on the PDSCH.In a seventh aspect, there is provided a non-transitory computer readable medium including program instructions for causing an apparatus to perform at least the method according to any of the above third and fourth aspects.In an eighth aspect, there is provided a terminal device. The terminal device includes receiving circuitry configured to receive (210, 530, 630) , from a network device (120) , a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; and performing circuitry configured to perform (250, 580, 680) , based on the configuration, at least one repetition reception (320-1 to 320-3) of the SIB carried on the PDSCH.In a ninth aspect, there is provided a network device. The network device includes transmitting circuitry configured to transmit (210, 530, 630) , to a terminal device (110) , a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; and performing circuitry configured to perform (240) , based on the configuration, at least one repetition transmission of the SIB carried on the PDSCH.In a tenth aspect, there is provided a computer program including instructions, which, when executed by an apparatus, cause the apparatus at least to perform at least the method according to any of the above third and fourth aspects.It is to be understood that the summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGSSome example embodiments will now be described with reference to the accompanying drawings, in which:FIG. 1 illustrates an example communication network in which embodiments of the present disclosure may be implemented;FIG. 2 illustrates a flowchart illustrating a process for a repetition mechanism according to some embodiments of the present disclosure;FIG. 3A illustrates a schematic diagram of scheduling repetitions with one DCI according to some embodiments of the present disclosure;FIG. 3B illustrates a schematic diagram of scheduling repetitions with multiple DCI according to some embodiments of the present disclosure;FIG. 4A illustrates a schematic diagram of an example of slot indexes for repetition occasions according to some embodiments of the present disclosure;FIG. 4B illustrates a schematic diagram of another example of slot indexes for repetition occasions according to some embodiments of the present disclosure;FIG. 5 illustrates a flowchart illustrating another process for a repetition mechanism according to some embodiments of the present disclosure;FIG. 6 illustrates a flowchart illustrating yet another process for a repetition mechanism according to some embodiments of the present disclosure;FIG. 7 illustrates a flowchart of a method implemented at a terminal device according to some embodiments of the present disclosure;FIG. 8 illustrates a flowchart of a method implemented at a network device according to some embodiments of the present disclosure;FIG. 9 illustrates a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure; andFIG. 10 illustrates a block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTIONPrinciples of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones described below.In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.References in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.It shall be understood that although the terms “first” and “second” etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and / or “including” , when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. As used herein, “at least one of the following: <a list of two or more elements>” and “at least one of <a list of two or more elements>” and similar wording, where the list of two or more elements are joined by “and” or “or” , mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements.As used in this application, the term “circuitry” may refer to one or more or all of the following:(a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and(b) combinations of hardware circuits and software, such as (as applicable) :(i) a combination of analog and / or digital hardware circuit (s) with software / firmware and(ii) any portions of hardware processor (s) with software (including digital signal processor (s) ) , software, and memory (ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and(c) hardware circuit (s) and or processor (s) , such as a microprocessor (s) or a portion of a microprocessor (s) , that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.As used herein, the term “communication network” refers to a network following any suitable communication standards, such as Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the future fifth generation (5G) communication protocols, and / or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.As used herein, the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom. The network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a new radio (NR) next generation NodeB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology. An RAN split architecture includes a gNB-CU (Centralized unit, hosting RRC, SDAP and PDCP) controlling a plurality of gNB-DUs (Distributed unit, hosting RLC, MAC and PHY) .The term “terminal device” refers to any end device that may be capable of wireless communication. By way of example rather than limitation, a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) . The terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and / or other wireless devices operating in an industrial and / or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and / or industrial wireless networks, and the like. In the following description, the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.Some UEs may have limited capabilities for receiving DL transmissions. To compensate for the reduced service coverage of the UEs, coverage enhancement techniques have been introduced that enable the UEs to transmit and receive data in a radio access network over longer distances and at lower power levels. Coverage enhancement techniques may involve a repetition mechanism. For example, repetition of data over multiple subframes may improve range and / or reception reliability.For the data of DL transmissions, System Information Block (SIB) , e.g. SIB1, is important since it serves several essential purposes in a cellular network. For example, the SIB may contain information about the cell identity (Cell ID) , enabling the UE to uniquely identify and select the serving cell for communication. The SIB may provide parameters related to cell re-selection criteria, including cell selection thresholds, cell barring, and other parameters influencing UE behavior when determining whether to re-select a different cell for handover or cell change. The SIB may include information about the system bandwidth, indicating the available bandwidth for downlink and uplink transmissions within the cell. This information helps UEs configure their radio interfaces accordingly. The SIB may contain the Tracking Area Code (TAC) , identifying the tracking area to which the cell belongs, facilitating tracking area updates and mobility management procedures. The SIB may provide information about radio frame timing, including the system frame number (SFN) and subframe timing, essential for synchronizing UEs with the cell's timing and ensuring accurate reception and transmission of data. The SIB may include parameters related to paging procedures, such as the paging cycle and paging occasion configuration, ensuring timely delivery of paging messages to UEs in the cell. From the paging configuration parameters, it is possible for the UE to derive the paging frame and paging occasion which is to be used to monitor for the Paging message (through the P-RNTI) . The SIB may also include configuration parameters relevant to the initial access procedure for UEs, such as Random Access Channel (RACH) parameters. These parameters define RACH resources, preamble format, preamble transmission power, and other parameters necessary for UEs to access the network and establish connections. Additionally, the SIB may provide information about resources allocated for Physical Uplink Control Channel (PUCCH) , Physical Uplink Shared Channel (PUSCH) , Physical Downlink Control Channel (PDCCH) , and Physical Downlink Shared Channel (PDSCH) during RACH procedures, including resources for MSG2, MSG3, and MSG4 transmissions. Thus, the SIB plays a critical role in providing essential system information to UEs, facilitating efficient network access, mobility management, and seamless communication procedures.A reception procedure for SIB in NR may involve synchronization, master information block (MIB) decoding, PDCCH monitoring, SIB detection, decoding and processing. This procedure ensures that the UE can acquire essential system information, synchronize with the NR network for reliable operation, and execute random access if necessary.Specifically, the UE synchronizes with the downlink transmission from the base station (gNodeB) using primary synchronization signals (PSS) and secondary synchronization signals (SSS) . This synchronization enables the UE to detect and decode the MIB transmitted on the Physical Broadcast Channel (PBCH) . From the detection of the PSS and the SSS, the gNB is able to extract the Physical Cell ID through sequence mapping and hypothesis tests.The UE decodes the MIB to extract essential system parameters, such as the SFN, subcarrier spacing, and PDCCH configuration. The PDCCH configuration information provided in the MIB indicates the resources allocated for Type0-PDCCH transmission, including the Control Resource Set Zero (CORESET0) configuration.Based on the PDCCH configuration information from the decoded MIB, the UE monitors the PDCCH to receive scheduling assignments for SIB reception. The PDCCH carries control information used to allocate resources for system information transmission.Upon receiving the scheduling assignment for SIB via downlink control information (DCI) on the PDCCH, the UE begins monitoring the PDSCH for SIB transmission. The PDSCH carries SIB, which contains essential system information required for a UE operation, for knowing both the resources to monitor for paging and the resources to use for the UE to initiate connection to the network (the physical random access channel (PRACH) resources) .The UE decodes the received SIB transmission to extract system information elements, including cell identity, tracking area code, system bandwidth, and scheduling information. This information is processed to synchronize with the cell and configure UE operation accordingly.During the reception procedure for SIB, the SIB can be carried on the PDSCH. Also, the monitoring occasion of Type0-PDCCH for scheduling SIB PDSCH is specified, and UE can find the SIB PDSCH occasion upon TDRA field in DCI format 1-0 with CRC scrambled by a system information-radio network temporary identity (SI-RNTI) . However, PDSCH repetition might be supported for RRC connected UE, hence it is impossible to be utilized by PDSCH carrying SIB.For improving the physical layer performance of the PDSCH carrying SIB, the approach that is typically used is to assign a larger number of resources for transmission of a certain number of bits. One approach to achieve this is to repeat the transmitted data (that is a given data channel) multiple times, to give the possibility to a receiver to combine the received signals and improve the reliability of the demodulated and decoded bits. Thus, a method that could be adopted in the enhancements of the coverage of the PDSCH carrying SIB, would be to repeat the PDSCH multiple times in a same or different slot, thereby allowing a UE receiver to combine the received PDSCH single transmissions.However, in order to combine multiple PDSCH repetitions, it is necessary for the UE to know at least if and how many repetitions are being transmitted by the gNB, and hence the time span of the PDSCH repetitions. In view of this, a method for configuration or indication of PDSCH carrying SIB with repetitions are desirable.In other aspects, the repetition is a time domain multiplexing manner, and how to determine the time resources for repetitions and ensure backwards compatibility is desired to be provided. That is, UEs should be able to receive SIB repetition (s) without affecting the obtaining of other broadcast information.According to embodiments of the present disclosure, there is providing a solution to implement a repetition mechanism for SIB carried on the PDSCH. A terminal device can receive a configuration for scheduling at least one repetition of SIB carried on the PDSCH. Based on the configuration, the terminal device can perform at least one repetition reception of the SIB carried on the PDSCH. As such, a solution for repetitions of SIB carried on the PDSCH is provided while the backwards compatibility can be ensured.Principles and embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.FIG. 1 illustrates a schematic diagram of an example communication environment 100 in which some embodiments of the present disclosure can be implemented. The environment 100, which may be a part of a communication network, includes devices such as a terminal device 110 and a network device 120. The communication between the terminal device 110 and the network device 120 may be direct or indirect. As an example, the terminal device 110 and the network device 120 may communicate with one or more further devices not shown in FIG. 1.In an example, throughout the description, to transmit data and / or control information, the terminal device 110 may perform communications with the network device 120. A link from the network device 120 to the terminal device 110 is referred to as a downlink (DL) , while a link from the terminal device 110 to the network device 120 is referred to as an uplink (UL) .Although the terminal device 110 and the network device 120 are described in the communication environment 100 of FIG. 1, embodiments of the present disclosure may equally apply to any other suitable communication devices in communication with one another. That is, embodiments of the present disclosure are not limited to the exemplary scenarios of FIG. 1.It is to be understood that the particular number of various communication devices and the particular number of various communication links as shown in FIG. 1 is for illustration purpose only without suggesting any limitations. The communication environment 100 may include any suitable number of communication devices and any suitable number of communication links for implementing embodiments of the present disclosure. In addition, it should be appreciated that there may be various wireless as well as wireline communications (if needed) among all of the communication devices.The communications in the environment 100 may follow any suitable communication standards or protocols, which are already in existence or to be developed in the future, such as Universal Mobile Telecommunications System (UMTS) , long term evolution (LTE) , LTE-Advanced (LTE-A) , the fifth generation (5G) New Radio (NR) , Wireless Fidelity (Wi-Fi) and Worldwide Interoperability for Microwave Access (WiMAX) standards, and employs any suitable communication technologies, including, for example, Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiplexing (OFDM) , time division multiplexing (TDM) , frequency division multiplexing (FDM) , code division multiplexing (CDM) , Bluetooth, ZigBee, and machine type communication (MTC) , enhanced mobile broadband (eMBB) , massive machine type communication (mMTC) , ultra-reliable low latency communication (URLLC) , Carrier Aggregation (CA) , Dual Connectivity (DC) , and New Radio Unlicensed (NR-U) technologies.More details of some embodiments of the present disclosure will be described with reference to FIGS. 2 to 6. FIG. 2 shows a signaling chart illustrating a process 200 for a repetition mechanism according to various embodiments. FIG. 5 shows a signaling chart illustrating a process 500 for a repetition mechanism according to various embodiments. FIG. 6 shows a signaling chart illustrating a process 600 for a repetition mechanism according to various embodiments. Only for the purpose of discussion, the processes 200, 500, and 600 will be described with reference to FIG. 1. The processes 200, 500, and 600 may involve the terminal device 110 and the network device 120 in FIG. 1. It is to be appreciated that any graphic elements, numerical values, and descriptive text in these figures are only for the purpose of illustration without suggesting any limitations.In the processes 200, 500, and 600, the terminal device (e.g. UE) 110 receives (210, 530, 640) , from the network device (e.g. gNB) 120, a configuration for scheduling at least one repetition of SIB carried on PDSCH. In particular, one Type0-PDCCH can be used to schedule repetitions of SIB carried on PDSCH. Before the configuration is received, the terminal device 110 may perform (510, 610) the synchronization operation using synchronization signals (SSs) as described above. Herein, two types of UEs can be distinguished with regard to the capability of PDSCH repetitions. For example, a type 1 UE refers to a UE with the capability of repetitions for PDSCH conveying SIB, and a type 2 UE refers to a UE without this repetition capability.In some example embodiments, the configuration comprises an indication of a number of the at least one repetition (e.g. repetitions 320-1 to 320-3 in FIGS. 3A and 3B) of the SIB. A maximum of the number of the at least one repetition of the SIB may be determined based on preconfigured time domain resources and a preconfigured number of system synchronization blocks (SSBs) for repetitions. The preconfigured time domain resources and SSBs for repetitions will be described in detail below.In one example embodiment, the number of the at least one repetition (e.g. repetitions 320-1 to 320-3 in FIGS. 3A and 3B) of the SIB may be indicated with at least one value or at least one bit of a modulation coding scheme (MCS) field in DCI (e.g. DCI 310 in FIGS. 3A and 3B) . Specifically, for example, the gNB 120 may signal to the UE 110 a number of repetitions of SIB carried on PDSCH of a trigger of a configured number of repetitions of SIB carried on PDSCH by repurposing MCS bits in DCI format 1-0 with CRC scrambled by SI-RNTI. On the other side of communication, the UE 110 may monitor 630 PDCCH with CRC scrambled by SI-RNTI configured by resource of CORESET0. Further, the UE 110 may receive DCI including an indication of the number of repetitions of SIB, i.e., receive 640 the number of repetitions indicated in DCI. Based on this indication, the UE 110 may ready to receive the repetitions of SIB carried on PDSCH.In an implementation, the partial bits of MCS index (IMCS) can be repurposed as an indication of repetitions of SIB carried on PDSCH due to anticipated low MCS for PDSCH carrying SIB transmission, as specified by TS 38.214. The UE 110 may not be intended to decode the PDSCH scheduled with SI-RNTI and Qm > 2.Additionally or alternatively, since the MCS index of PDSCH scheduled with SI-RNTI is limited to 9 and 4 bits is sufficient for indicating MCS index, at least one bit can be used for indicating the number of repetitions.Additionally or alternatively, if the MCS index is further limited to a range of 0-6, there are two bits available for indicating the number of repetitions.Additionally or alternatively, since the MCS index of PDSCH scheduled with SI-RNTI is limited to 9, the MCS indexes from 10 to 31 can be repurposed to limit the MCS index to 9, and at the same time, implicitly indicate the repetition factor.Additionally or alternatively, the MCS indexes from 0 to 9 indicates the number of repetitions of 1, the index of MCS from 10 to19 indicates the MCS index from 0 to 9 plus the number of repetitions of 2, and the index of MCS from 20 to29 indicates MCS index from 0 to 9 plus the number of repetitions of 4.Additionally or alternatively, the at least one defined value or at least one defined bit is used for the at least one repetition of the SIB at a time, and the at least one defined value or bit is used for modulating and coding at an another time. That is, the at least one repurposed value or at least one repurposed bit is used for the at least one repetition of the SIB, and the at least one repurposed value or bit is used for modulating and coding scheme (MCS) and for indicating the number of repetitions of SIB respectively at different times. For example, the at least one repurposed value or bit may be used for repetitions of the SIB and modulating and coding in a periodicity that consists of a time 1 and a time 2. More specifically, at the time 1, the at least one repurposed value or bit may be used for the repetitions of SIB scheduled by DCI with MCS field (s) . At the time 2, the at least one repurposed value or bit may be used for modulating and coding SIB scheduled by DCI with MCS field (s) In other words, the gNB 120 may transmit the repurposed MCS index in DCI format 1-0 with CRC scrambled by SI-RNTI and non-repurposed conventional DCI in an interlaced manner with the double periodicity of transmission. Thus, the type1 UE may listen to enhanced DCI to obtain repetition gain, whereas the type2 UE may listen conventional DCI. Hence, the solution (s) described herein can be backwards compatible.Additionally or alternatively, based on the DCI signalling, the UE 110 might skip the Type0-PDCCH monitoring at the repetition occasion, because the UE 110 can decode the SIB PDSCH according to the frequency and time domains indicated by DCI at the first transmission occasion.In another example embodiment, the number of the at least one repetition (e.g. repetitions 320-1 to 320-3 in FIGS. 3A and 3B) of the SIB may be indicated with at least one reserved bit in the DCI. Specifically, for example, the gNB 120 can signal to the UE 110 a number of repetitions of SIB carried on PDSCH or a trigger of a configured number of repetitions of SIB carried on PDSCH using reserved bits in DCI format 1-0 with CRC scrambled by SI-RNTI. On the other side of communication, the UE 110 may monitor 630 PDCCH with CRC scrambled by SI-RNTI configured by resource of CORESET0. Further, the UE 110 may receive DCI including an indication of the number of repetitions of SIB, i.e., receive 640 the number of repetitions indicated in DCI. Based on this indication, the UE 110 may ready to receive the repetitions of SIB carried on PSDCH.Some of the reserved bits in DCI format 1_0 with CRC scrambled by SI-RNTI are allocated for this indication. Although these bits have been reserved, the UE 110 in the disclosure may consider a portion of the reserved bits as carrying information related to this indication. In this way, backward compatibility can be ensured. For example, the Type1 UE can recognize the repurposing and operate in an enhanced manner as described herein, while the Type2 UE can disregard the repurposed bits and operate in other manner.In an implementation, the number of reserved bits used for the indication can be defined according to actual requirements. For example, two reserved bits are allocated for the indication, or only one reserved bit is used for this purpose. In an example, the gNB 120 may indicate the number of reserved bits used for the indication through higher layer signaling, e.g. MIB.Additionally or alternatively, the positions of the reserved bits used for the indication can be defined according to actual requirements. For example, the first two (two Most Significant Bits) reserved bits are employed. In an example, the gNB 120 may indicate the positions of reserved bits used for the indication through higher layer signaling, e.g. MIB.Additionally or alternatively, the gNB 120 may indicate the position of a single toggle bit used for the indication. In an example, (0 1 0 0 0 …0) and (0 0 0 1 …0) indicates 2 and 4 repetitions respectively, as the toggle bit (0->1) is at the second and fourth positions within reserved bits. In another example, (1 0 0 0 0 …0) and (0 1 0 0 …0) indicates 2 and 4 repetitions respectively since the relationship between the number of repetitions and the position of the toggle bit is specified or configured by the network.Additionally or alternatively, the first reserved bit may serve to indicate whether the reserved bits are utilized for indicating the number of repetitions. If the first reserved bit indicates that the reserved bits are not utilized for indicating the number of repetitions, the UE 110 may disregard these reserved bits. In this way, a one-bit indicator (such as the first bit in this case) can be repurposed for determining whether the reserved bits are used for indicating the number of repetitions of SIB before the UE 110 analyzes them.Additionally or alternatively, some of the reserved bits in DCI format 1_0 with CRC scrambled by SI-RNTI are allocated to introduce a field that carries the indication of the number of repetitions of SIB.Additionally or alternatively, the bits used to indicate the number of repetitions of SIB carried on PDSCH may explicitly specify a repetition factor. For example, a value of the repetition factor may directly represent the number of repetitions itself, rather than serving as a codepoint which in turn represents the number of repetitions.Additionally or alternatively, the bits used to indicate the number of repetitions of SIB carried on PDSCH may implicitly represent the repetition factor. For example, these bits may serve as a codepoint referencing a row in a table of values representing repetition factors. In this way, the table may be specified to indicate the number of repetitions of SIB. The table may be configured by the gNB 120 through higher layer signalling, or configured at the higher layer. However, if the configuration is absent, the UE 110 may resort to using the specified table herein.Additionally or alternatively, the number of repetitions may be configured at the higher layer, and a value of bit (s) employed for the indication may be used to trigger the indication of the number of repetitions of SIB. For example, if one bit is utilized, one of its values indicates that the repetition factor is in use, while the other value indicates that the repetition factor is not used.Additionally or alternatively, the indication of the number of repetitions of SIB may notify the UE 110 that an "extension" of the physical resources for the SIB PDSCH has been implemented. This means that the UE 110 supporting the repetition mechanism herein would extract the PDSCH resource elements for carrying the SIB from multiple slots before the decoding of the data packet carried on the SIB PDSCH begins.Additionally or alternatively, based on the DCI signalling, the UE 110 might skip the Type0-PDCCH monitoring at the repetition occasion, because the UE 110 can decode the SIB PDSCH according to the frequency and time domains indicated by DCI at the first transmission occasion.In yet another example embodiment, the number of the at least one repetition (e.g. repetitions 320-1 to 320-3 in FIGS. 3A and 3B) of the SIB may be indicated by repurposing MIB field (s) . For example, the gNB 120 may transmit (520, 620) the configuration for scheduling repetitions of SIB carried on PDSCH, and this configuration includes an indication of a number of repetitions of SIB, for example, one of factors in [1, 2, 4, 8] . On the other side of communication, the UE 110 may receive 530 the configuration and ready 530 to receive the repetitions of SIB PDSCH.In an implementation, the configuration for scheduling repetitions of SIB carried on PDSCH may further include a trigger of a specified repetition framework.Additionally or alternatively, the configuration for scheduling repetitions of SIB carried on PDSCH may include information on a starting to receiving occasions for PDSCH carrying SIB repetitions.Additionally or alternatively, the spare bit field in MIB may be utilized to convey the configuration for scheduling repetitions of SIB carried on PDSCH.Additionally or alternatively, the cellBarred field in MIB may be repurposed to convey the configuration for scheduling repetitions of SIB carried on PDSCH. It is to be noted that the UEs can ignore the cellBarred field for NTN connectivity, so this solution would primarily apply to NTN deployments, and the configuration of PDSCH carrying SIB repetitions only applies to NTN bands.Additionally or alternatively, combination of the spare and cellBarred fields is utilized to convey the configuration for scheduling repetitions of SIB carried on PDSCH. For example, the combination of the two fields creates a codepoint that corresponds to a specified table as shown by Table 1 below.Table 1 relationship between a codepoint of two fields and a number of SIB repetitionsAdditionally or alternatively, the repurposed bits mentioned above are applicable only to the SIB PDSCH repetition capable UE introduced after Rel-19, such as type1 UE, and the UE (including the Rel-19 UE that are not SIB PDSCH capable or an earlier Rel 19 UE (e.g., type2 UE) ) should ignore the configuration and continue to function as they operate in previous release, i.e., no repetition of PDSCH carrying SIB.Then, the UE 110 may further monitor 540 PDCCH with CRC scrambled by SI-RNTI according to CORESET0 to obtain DCI for reception of SIB. Next, the gNB 120 may transmit 550 first PDSCH with time / frequency domain resource (s) indicated by SI-RNTI PDCCH. Accordingly, the UE 110 can receive 560 the first PDSCH according to an indication in DCI. Likewise, in the process 600, the gNB 120 may transmit 650 first PDSCH with time / frequency domain resource (s) indicated by SI-RNTI PDCCH. Accordingly, after the UE 110 monitors 630 PDCCH with CRC scrambled by SI-RNTI, the UE 110 may receive 660 the first PDSCH according to an indication in DCI.Now continuing with reference to FIG. 2, the terminal device 120 performs 240, based on the configuration, at least one repetition transmission of the SIB carried on the PDSCH. Accordingly, the terminal device 110 performs 250, based on the configuration, at least one repetition reception (e.g. repetitions 320-1 to 320-3 in FIGS. 3A and 3B) of the SIB carried on the PDSCH. In particular, the UE 110 may skip monitoring the occasions corresponding to the PDSCH repetitions for SIB except for the first PDSCH.For example, as shown in FIG. 5, the gNB 120 may transmit 570 second PDSCH at a repetition occasion. On the other side of communication, the UE 110 can receive 580 the second PDSCH according to a repetition occasion. Then, the UE 110 may combine 590 the PDSCH with repetitions.Likewise, as shown in FIG. 5, the gNB 120 may transmit 670 second PDSCH at a repetition occasion. On the other side of communication, the UE 110 can receive 680 the second PDSCH according to a repetition occasion. Then, the UE 110 may combine 690 the PDSCH with repetitions.In an implementation, the at least one repetition (e.g. 320-1 to 320-3) of the SIB may be indicated with a same DCI 310 associated with a first SI-RNTI (e.g., DCI with CRC scrambled with SI-RNTI) . For example, the UE 110 may only be required to decode one DCI with SI-RNTI, as shown in FIG. 3A. This DCI can be used for both the first and repetition PDSCHs carrying SIB.In another implementation, the at least one repetition of the SIB comprises a first repetition (i.e. 1st repetition) 320-1 of the SIB and a second repetition (i.e. 2nd repetition) 320-2 of the SIB, the first repetition is indicated with a second DCI 310-1 associated with a second SI-RNTI (e.g., DCI with CRC scrambled with SI-RNTI-REP, SI-RNTI-REP is newly defined value and different with SI_RNTI, ) , and the second repetition is indicated with a third DCI 310-2 associated with a third SI-RNTI (e.g., DCI with CRC scrambled with SI-RNTI-REP) . The first SI-RNTI can be different from the second SI-RNTI and / or the third SI-RNTI, but they might point to the same PDSCH resources. For example, two DCIs points to the same PDSCH resources, but the UE 110 finds that the "repetition" RNTI will be able to be combined across resources (e.g., in the time domain) . In this implementation, an occasion for a repetition of SIB carried on PDSCH is indicated by the DCI with SI-RNTI-REP which is only monitored by the Type 1 UE, and the occasion for the repetition of SIB is flexible, as shown in FIG. 3B.In some example embodiments, prior to performing one of the at least one repetition reception of the SIB, the terminal device 110 may determine 230, from preconfigured time domain resources that have been assigned 220 by the network device 120 to the terminal device 110, a time domain resource for the one of the at least one repetition reception of the SIB.Further, based on the determined time domain resource, the UE 110 may perform, at least one occasion corresponding to the at least one repetition reception of the SIB, the at least one repetition reception (e.g. 320-1 to 320-3) of the SIB based on a trigger indicated by at least one bit in DCI.Additionally or alternatively, based on the determined time domain resource, the UE 110 may perform, at least one occasion corresponding to the at least one repetition reception of the SIB, the at least one repetition reception (e.g. 320-1 to 320-3) of the SIB based on a trigger indicated by at least one bit in MIB.With the scheduling solution provided herein, the repetition occasion for PDSCH carrying SIB may be pre-defined. The repetition occasions associated with SSB indexes may be extended on top of original monitoring occasion which is specified as Table 13-11 through 13-12A in TS 38.213, this extension is expected not to change the original monitoring occasions in order to maintain good backwards compatibility.In an implementation, the repetition occasion follows the original occasions associated with all SSB indices. More specifically, the extended equation is for determination of SIB PDSCH occasions nj , where j∈ {0, 1, …, K-1} , K is the number of repetitions.Where μ∈ {1, 2, 3, 4, 5, 6} , O and M are from the tables which is specified as Table 13-11 through 13-12A in TS 38.213, i is the SSB index, L_max is a maximum number of SSB indexes in a cell that is specified in clause 4.1 of TS 38.213. j∈ {0, 1, …, K-1} , and j=0 indicates the original transmission slot, and j>0 indicates the repetition slots. More details will be described below.FIG. 4A illustrates a schematic diagram of an example of slot indexes for repetition occasions according to some embodiments of the present disclosure. In the example, there are 20 slots (i.e., N can represent slots, e.g. 20) in a frame and a maximum of 8 SSB indexes, and repetition occasion is calculated by equation in para.
[0099] . Based on the equation, for the configuration index 0, the original transmission slots are in {0, 1, …, 7} and repetition occasions is in {8, 9, …, 15} . The O is an offset from the 1st slot, and the M is a multiplexing factor that denotes how many search space sets corresponding SSB indices in a slot. Importantly, there is no overlap or collision between the original transmission slots and the repetition occasions. For the configuration index 8, the original and repetition occasions within the black rectangle overlap. Therefore, the invalid repetition occasions can be reverted due to collision.FIG. 4B illustrates a schematic diagram of another example of slot indexes for repetition occasions according to some embodiments of the present disclosure. In this example, there are 20 slots in a frame and a maximum of 4 SSB indexes, the resource is sufficient to support number of repetitions of 2.Additionally, the extended slots for repetitions that overlap with the original occasion slots can be disregarded for repetitions, rendering them invalid candidates for repetition.Additionally or alternatively, if the extended slots for repetitions overlap with the original occasion slots, the inter-slot repetition factor can revert to its previous value, for example, K = K-1, to prevent resource collision.The solution (s) of the disclosure provides a configuration and indication of a backwards compatible PDSCH repetition scheme for SIB. The configuration is implemented in a static manner, for example, through high layer signalling, i.e. MIB, while the indication is done dynamically, for example, through DCI format 1-0 with CRC scrambled by SI-RNTI. The gNB can dynamically determine the number of repetitions based on cell-level measurements using a dynamic indication mechanism, thereby conserving resources. In addition, a time domain resource allocation solution for repetitions of SIB carried on PDSCH is provided.FIG. 7 shows a flowchart of an example method 700 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 700 will be described from the perspective of the terminal device 110 with reference to FIG. 1.At block 710, the terminal device 110 receives receive (210, 530, 630) , from a network device (120) , a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) . At block 720, the terminal device 110 performs (250, 580, 680) , based on the configuration, at least one repetition reception (320-1 to 320-3) of the SIB carried on the PDSCH.In some embodiments, the configuration comprises an indication of a number of the at least one repetition (320-1 to 320-3) of the SIB.In some embodiments, the number of the at least one repetition (320-1 to 320-3) of the SIB is indicated (540, 640) with at least one defined value or at least one defined bit of a modulation coding scheme (MCS) field in downlink control information (DCI) (310) .In some embodiments, the at least one defined value or at least one defined bit is used for the at least one repetition (320-1 to 320-3) of the SIB at a time, and the at least one defined value or bit is used for modulating and coding scheme (MCS) at another time.In some embodiments, the number of the at least one repetition (320-1 to 320-3) of the SIB is indicated (540, 640) with at least one reserved bit in the DCI.In some embodiments, the at least one repetition (320-1 to 320-3) of the SIB is indicated with a same DCI associated with a first system information-radio network temporary identity (SI-RNTI) (310) .In some embodiments, the at least one repetition of the SIB comprises a first repetition (320-1) of the SIB and a second repetition (320-2) of the SIB, the first repetition is indicated with a second DCI (310-1) associated with a second SI-RNTI, and the second repetition is indicated with a third DCI (310-2) associated with a third SI-RNTI.In some embodiments, a maximum of the number of the at least one repetition of the SIB is determined based on preconfigured time domain resources and a preconfigured number of system synchronization blocks (SSBs) for repetitions.In some embodiments, the terminal device 110 may perform, at least one occasion corresponding to the at least one repetition reception of the SIB, one or both of the following: performing the at least one repetition reception (320-1 to 320-3) of the SIB based on a trigger indicated (540, 640) by at least one bit in DCI; or performing the at least one repetition reception (320-1 to 320-3) of the SIB based on a trigger indicated (540, 640) by at least one bit in a master information block (MIB) .In some embodiments, the at least one occasion is non-overlapped with a monitoring occasion for an initial reception of the SIB (560) . Additionally or alternatively, the at least one occasion is determined based on a maximum number of SSBs indexes and a repetition slot for the SIBIn some embodiments, prior to performing one of the at least one repetition reception of the SIB, the terminal device 110 may determine (230) , from preconfigured time domain resources, a time domain resource for the one of the at least one repetition reception of the SIB.FIG. 8 shows a flowchart of an example method 800 implemented at a network device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 800 will be described from the perspective of the network device 120 with reference to FIG. 1.At block 810, the network device 120 transmits (210, 530, 630) , to a terminal device (110) , a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) . At block 820, the network device 120 performs (240) , based on the configuration, at least one repetition transmission of the SIB carried on the PDSCH.In some embodiments, the configuration comprises an indication of a number of the at least one repetition (320-1 to 320-3) of the SIB.In some embodiments, the number of the at least one repetition (320-1 to 320-3) of the SIB is indicated (540, 640) with at least one defined value or at least one defined bit of a modulation coding scheme (MCS) field in downlink control information (DCI) (310) .In some embodiments, the at least one defined value or bit is used for the at least one repetition (320-1 to 320-3) of the SIB at a time, and the at least one defined value or bit is used for modulating and coding at another time.In some embodiments, the number of the at least one repetition (320-1 to 320-3) of the SIB is indicated (540, 640) with at least one reserved bit in the DCI.In some embodiments, the at least one repetition (320-1 to 320-3) of the SIB is indicated with a same DCI associated with a first system information-radio network temporary identity (SI-RNTI) (310) .In some embodiments, the at least one repetition of the SIB comprises a first repetition (320-1) of the SIB and a second repetition (320-2) of the SIB, the first repetition is indicated with a second DCI (310-1) associated with a second SI-RNTI, and the second repetition is indicated with a third DCI (310-2) associated with a third SI-RNTI.In some embodiments, a maximum of the number of the at least one repetition of the SIB is determined based on preconfigured time domain resources and a preconfigured number of system synchronization blocks (SSBs) for repetitions.In some embodiments, the configuration comprises one or both of the following: an indication of a trigger of the at least one repetition (320-1 to 320-3) of the SIB indicated (540, 640) by at least one bit in DCI; or an indication of a trigger of the at least one repetition (320-1 to 320-3) of the SIB indicated (540, 640) by at least one bit in a master information block (MIB) .In some embodiments, prior to performing one of the at least one repetition transmission of the SIB, the network device 120 may configure, to the terminal device (110) , time domain resources for repetitions.In some embodiments, an apparatus capable of performing the method 700 (for example, the terminal device 110) may include means for performing the respective steps of the method 700. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.In some embodiments, the apparatus includes: means for receiving, at a terminal device and from a network device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; and means for performing, based on the configuration, at least one repetition reception of the SIB carried on the PDSCH.In some embodiments, the configuration comprises an indication of a number of the at least one repetition (320-1 to 320-3) of the SIB.In some embodiments, the number of the at least one repetition (320-1 to 320-3) of the SIB is indicated (540, 640) with at least one defined value or at least one defined bit of a modulation coding scheme (MCS) field in downlink control information (DCI) (310) .In some embodiments, the at least one defined value or at least one defined bit is used for the at least one repetition (320-1 to 320-3) of the SIB at a time, and the at least one defined value or bit is used for modulating and coding scheme (MCS) at another time.In some embodiments, the number of the at least one repetition (320-1 to 320-3) of the SIB is indicated (540, 640) with at least one reserved bit in the DCI.In some embodiments, the at least one repetition (320-1 to 320-3) of the SIB is indicated with a same DCI associated with a first system information-radio network temporary identity (SI-RNTI) (310) .In some embodiments, the at least one repetition of the SIB comprises a first repetition (320-1) of the SIB and a second repetition (320-2) of the SIB, the first repetition is indicated with a second DCI (310-1) associated with a second SI-RNTI, and the second repetition is indicated with a third DCI (310-2) associated with a third SI-RNTI.In some embodiments, a maximum of the number of the at least one repetition of the SIB is determined based on preconfigured time domain resources and a preconfigured number of system synchronization blocks (SSBs) for repetitions.In some embodiments, the apparatus may include means for performing, at at least one occasion corresponding to the at least one repetition reception of the SIB, one or both of the following: performing the at least one repetition reception (320-1 to 320-3) of the SIB based on a trigger indicated (540, 640) by at least one bit in DCI; or performing the at least one repetition reception (320-1 to 320-3) of the SIB based on a trigger indicated (540, 640) by at least one bit in a master information block (MIB) .In some embodiments, the at least one occasion is non-overlapped with a monitoring occasion for an initial reception of the SIB (560) . Additionally or alternatively, the at least one occasion is determined based on a maximum number of SSBs indexes and a repetition slot for the SIBIn some embodiments, the apparatus may further include means for prior to performing one of the at least one repetition reception of the SIB, determining (230) , from preconfigured time domain resources, a time domain resource for the one of the at least one repetition reception of the SIB.In some embodiments, the apparatus further includes means for performing other steps in some embodiments of the method 700. In some embodiments, the means includes at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.In some embodiments, an apparatus capable of performing the method 800 (for example, the network device 120) may include means for performing the respective steps of the method 800. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.In some embodiments, the apparatus includes: means for transmitting, at a network device and to a terminal device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; and means for performing, based on the configuration, at least one repetition transmission of the SIB carried on the PDSCH.In some embodiments, the configuration comprises an indication of a number of the at least one repetition (320-1 to 320-3) of the SIB.In some embodiments, the number of the at least one repetition (320-1 to 320-3) of the SIB is indicated (540, 640) with at least one defined value or at least one defined bit of a modulation coding scheme (MCS) field in downlink control information (DCI) (310) .In some embodiments, the at least one defined value or the at least one defined bit is used for the at least one repetition (320-1 to 320-3) of the SIB at a time, and the at least one defined value or bit is used for modulating and coding at another time.In some embodiments, the number of the at least one repetition (320-1 to 320-3) of the SIB is indicated (540, 640) with at least one reserved bit in the DCI.In some embodiments, the at least one repetition (320-1 to 320-3) of the SIB is indicated with a same DCI associated with a first system information-radio network temporary identity (SI-RNTI) (310) .In some embodiments, the at least one repetition of the SIB comprises a first repetition (320-1) of the SIB and a second repetition (320-2) of the SIB, the first repetition is indicated with a second DCI (310-1) associated with a second SI-RNTI, and the second repetition is indicated with a third DCI (310-2) associated with a third SI-RNTI.In some embodiments, a maximum of the number of the at least one repetition of the SIB is determined based on preconfigured time domain resources and a preconfigured number of system synchronization blocks (SSBs) for repetitions.In some embodiments, the configuration comprises one or both of the following: an indication of a trigger of the at least one repetition (320-1 to 320-3) of the SIB indicated (540, 640) by at least one bit in DCI; or an indication of a trigger of the at least one repetition (320-1 to 320-3) of the SIB indicated (540, 640) by at least one bit in a master information block (MIB) .In some embodiments, the apparatus further includes means for prior to performing one of the at least one repetition transmission of the SIB, configuring, to the terminal device (110) , time domain resources for repetitions.In some embodiments, the apparatus further includes means for performing other steps in some embodiments of the method 800. In some embodiments, the means includes at least one processor and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.FIG. 9 is a simplified block diagram of a device 900 that is suitable for implementing example embodiments of this disclosure. The device 900 may be provided to implement the communication device, for example the terminal device 110 and network device 120 as shown in FIG. 1. As shown, the device 900 includes one or more processors 910, one or more memories 920 coupled to the processor 910, and one or more communication modules 940 coupled to the processor 910.The communication module 940 is for bidirectional communications. The communication modules 940 have at least one antenna to facilitate communication. The communication interface may represent any interface that is necessary for communication with other network elements.The processor 910 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting and illustrative examples. The device 900 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.The memory 920 may include one or more non-volatile memories and one or more volatile memories. Examples of the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 924, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and / or optical storage. Examples of the volatile memories include, but are not limited to, a random access memory (RAM) 922 and other volatile memories that will not last in the power-down duration.A computer program 930 includes computer executable instructions that are executed by the associated processor 910. The program 930 may be stored in the ROM 924. The processor 910 may perform any suitable actions and processing by loading the program 930 into the RAM 922.The example embodiments of this disclosure may be implemented by means of the program 930 so that the device 900 may perform any process of this disclosure as discussed with reference to FIGS. 2 to 8. The example embodiments of this disclosure may also be implemented by hardware or by a combination of software and hardware.In some example embodiments, the program 930 may be tangibly contained in a computer readable medium which may be included in the device 900 (such as in the memory 920) or other storage devices that are accessible by the device 900. The device 900 may load the program 930 from the computer readable medium to the RAM 922 for execution. The computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like. FIG. 10 shows an example of the computer readable medium 1000 in form of CD or DVD. The computer readable medium has the program 930 stored thereon.Generally, various example embodiments of this disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of example embodiments of this disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting and illustrative examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.This disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the methods as described above with reference to FIGS. 2-8. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various example embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.Program code for carrying out methods of this disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.In the context of this disclosure, the computer program code or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above. Examples of the carrier include a signal, computer readable medium, and the like.The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable medium may include, but not be limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. The term “non-transitory, ” as used herein, is a limitation of the medium itself (e.g., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM) .Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of this disclosure, but rather as descriptions of features that may be specific to particular example embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single example embodiment. Conversely, various features that are described in the context of a single example embodiment may also be implemented in multiple example embodiments separately or in any suitable sub-combination.Although this disclosure has been described in language specific to structural features and / or methodological acts, it is to be understood that the various example embodiments of this disclosure are not limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the various example embodiments of this disclosure.
Claims
1.A terminal device comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the terminal device at least to:receive, from a network device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; andperform, based on the configuration, at least one repetition reception of the SIB carried on the PDSCH.2.The terminal device of claim 1, wherein the configuration comprises an indication of a number of the at least one repetition of the SIB.3.The terminal device of claims 2, wherein the number of the at least one repetition of the SIB is indicated with at least one defined value or at least one defined bit of a modulation coding scheme (MCS) field in downlink control information (DCI) .4.The terminal device of claim 3, wherein the at least one defined value or at least one defined bit is used for the at least one repetition of the SIB at a time, and the at least one defined value or bit is used for modulating and coding at an another time.5.The terminal device of claim 2, wherein the number of the at least one repetition of the SIB is indicated with at least one reserved bit in the DCI.6.The terminal device of any of claims 2-5, wherein the at least one repetition of the SIB is indicated with a same DCI associated with a first system information-radio network temporary identity (SI-RNTI) .7.The terminal device of any of claims 2-5, wherein the at least one repetition of the SIB comprises a first repetition of the SIB and a second repetition of the SIB, the first repetition is indicated with a second DCI associated with a second SI-RNTI, and the second repetition is indicated with a third DCI associated with a third SI-RNTI.8.The terminal device of any of claims 2-7, wherein a maximum of the number of the at least one repetition of the SIB is determined based on preconfigured time domain resources and a preconfigured number of system synchronization blocks (SSBs) for repetitions.9.The terminal device of any of claims 1-8, wherein the terminal device is caused to perform, at at least one occasion corresponding to the at least one repetition reception of the SIB, one or both of the following:performing the at least one repetition reception of the SIB based on a trigger indicated by at least one bit in DCI; orperforming the at least one repetition reception of the SIB based on a trigger indicated by at least one bit in a master information block (MIB) .10.The terminal device of claim 9, wherein one or both of the following:the at least one occasion is non-overlapped with a monitoring occasion for an initial reception of the SIB; orthe at least one occasion is determined based on a maximum number of SSBs indexes and a repetition slot for the SIB.11.The terminal device of any of claims 1-10, wherein the terminal device is further caused to:prior to performing one of the at least one repetition reception of the SIB, determine, from preconfigured time domain resources, a time domain resource for the one of the at least one repetition reception of the SIB.12.A network device comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the network device at least to:transmit, to a terminal device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; andperform, based on the configuration, at least one repetition transmission of the SIB carried on the PDSCH.13.The network device of claim 12, wherein the configuration comprises an indication of a number of the at least one repetition of the SIB.14.The network device of claim 13, wherein the number of the at least one repetition of the SIB is indicated with at least one defined value or at least one defined bit of a modulation coding scheme (MCS) field in downlink control information (DCI) .15.The network device of claim 14, wherein the at least one defined value or at least one defined bit is used for the at least one repetition of the SIB at a time, and the at least one defined value or bit is used for modulating and coding at another time.16.The network device of claim 13, wherein the number of the at least one repetition of the SIB is indicated with at least one reserved bit in the DCI.17.The network device of any of claims 13-16, wherein the at least one repetition of the SIB is indicated with a same DCI associated with a first system information-radio network temporary identity (SI-RNTI) .18.The network device of any of claims 13-16, wherein the at least one repetition of the SIB comprises a first repetition of the SIB and a second repetition of the SIB, the first repetition is indicated with a second DCI associated with a second SI-RNTI, and the second repetition is indicated with a third DCI associated with a third SI-RNTI.19.The network device of any of claims 13-18, wherein a maximum of the number of the at least one repetition of the SIB is determined based on preconfigured time domain resources and a preconfigured number of system synchronization blocks (SSBs) for repetitions.20.The network device of any of claims 12-19, wherein the configuration comprises one or both of the following:an indication of a trigger of the at least one repetition of the SIB indicated by at least one bit in DCI; oran indication of a trigger of the at least one repetition of the SIB indicated by at least one bit in a master information block (MIB) .21.The network device of any of claims 12-20, wherein the network device is further caused to:prior to performing one of the at least one repetition transmission of the SIB, configure, to the terminal device, time domain resources for repetitions.22.A method comprising:receiving, at a terminal device and from a network device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; andperforming, based on the configuration, at least one repetition reception of the SIB carried on the PDSCH.23.A method comprising:transmitting, at a network device and to a terminal device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; andperforming, based on the configuration, at least one repetition transmission of the SIB carried on the PDSCH.24.An apparatus, comprising:means for receiving, at a terminal device and from a network device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; andmeans for performing, based on the configuration, at least one repetition reception of the SIB carried on the PDSCH.25.An apparatus, comprising:means for transmitting, at a network device and to a terminal device, a configuration for scheduling at least one repetition of a system information block (SIB) carried on a physical downlink shared channel (PDSCH) ; andmeans for performing, based on the configuration, at least one repetition transmission of the SIB carried on the PDSCH.26.A non-transitory computer readable medium comprising program instructions that, when executed by an apparatus, cause the apparatus to perform a method of claim 22 or 23.
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