Transmission with beams
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-02-07
- Publication Date
- 2026-08-13
Smart Images
Figure CN2025076356_13082026_PF_FP_ABST
Abstract
Description
TRANSMISSION WITH BEAMSFIELD
[0001] Various example embodiments relate to the field of communication and in particular, to devices, methods, apparatuses and a computer readable storage medium for transmission with beams.BACKGROUND
[0002] A 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.
[0003] 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.SUMMARY
[0004] In general, example embodiments of the present disclosure provide a solution for transmission with beams. With this solution, a synchronization signal and physical broadcast channel block (SSB) and a system information block type one (SIB1) are transmitted via the beams with different periodicities and different beams, thereby improving the performance of communication with the beams.
[0005] In a first aspect, there is provided a terminal device. The terminal device comprises at least one processor and at least one memory storing instructions. The instructions, when executed by the at least one processor, cause the terminal device at least to receive, from a network device, an SSB with a first periodicity. The terminal device is further caused to receive, from the network device, a SIB1, with a second periodicity, in an occasion associated with the transmission of the SSB. The second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0006] In a second aspect, there is provided a network device. The network device comprises at least one processor and at least one memory storing instructions. The instructions, when executed by the at least one processor, cause the network device at least to transmit, to a terminal device, an SSB via a first type of beam with a first periodicity. The network device is further caused to transmit, to the terminal device, a SIB1 via a second type of beam, with a second periodicity, in an occasion associated with the transmission of the SSB. And a coverage area of the first type of beam is covered by a set of the second type of beams, the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0007] In a third aspect, there is provided a method implemented at a terminal device. The method comprises receiving, from a network device, an SSB with a first periodicity. The method further comprises receiving, from the network device, a SIB1, with a second periodicity, in an occasion associated with the transmission of the SSB. The second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0008] In a fourth aspect, there is provided a method implemented at a network device. The method comprises transmitting, to a terminal device, an SSB via a first type of beam with a first periodicity. The method further comprises transmitting, to the terminal device, a SIB1 via a second type of beam, with a second periodicity, in an occasion associated with the transmission of the SSB. And a coverage area of the first type of beam is covered by a set of the second type of beams, the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0009] In a fifth aspect, there is provided an apparatus. The apparatus comprises means for receiving, from a network device, an SSB with a first periodicity. The apparatus further comprises means for receiving, from the network device, a SIB1, with a second periodicity, in an occasion associated with the transmission of the SSB. The second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0010] In a sixth aspect, there is provided an apparatus. The apparatus comprises means for transmitting, to a terminal device, an SSB via a first type of beam with a first periodicity. The apparatus further comprises means for transmitting, to the terminal device, a SIB1 via a second type of beam, with a second periodicity, in an occasion associated with the transmission of the SSB. And a coverage area of the first type of beam is covered by a set of the second type of beams, the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0011] In a seventh aspect, there is provided a terminal device. The terminal device comprises first receiving circuitry configured to receive, from a network device, an SSB with a first periodicity. The terminal device comprises second receiving circuitry configured to receive, from the network device, a SIB1, with a second periodicity, in an occasion associated with the transmission of the SSB. The second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0012] In an eighth aspect, there is provided a network device. The network device comprises first transmitting circuitry configured to transmit, to a terminal device, an SSB via a first type of beam with a first periodicity. The network device comprises second transmitting circuitry configured to transmit, to the terminal device, a SIB1 via a second type of beam, with a second periodicity, in an occasion associated with the transmission of the SSB. And a coverage area of the first type of beam is covered by a set of the second type of beams, the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0013] In a ninth aspect, there is provided a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to any one of the above third and fourth aspects.
[0014] In a tenth aspect, there is provided a computer program comprising instructions, which, when executed by an apparatus, cause the apparatus to perform at least the method according to any one of the above third and fourth aspects.
[0015] 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 DRAWINGS
[0016] Some example embodiments will now be described with reference to the accompanying drawings, in which:
[0017] FIG. 1A illustrates an example communication network in which embodiments of the present disclosure may be implemented;
[0018] FIG. 1B illustrates an example of occasions for SSB and SIB1;
[0019] FIG. 1C an example of use the same wide beam for transmitting SSB and SIB1;
[0020] FIG. 1D an example of resource allocation for SSB and SIB1;
[0021] FIG. 2 illustrates a flowchart illustrating an example of process for transmission with beams according to some embodiments of the present disclosure;
[0022] FIG. 3 illustrates an example of a plurality of narrow beams which will be splitting the satellite footprint covered by a wide beam according to some embodiments of the present disclosure;
[0023] FIG. 4 illustrates an example of sketch of physical layer procedure for initial access according to some embodiments of the present disclosure;
[0024] FIG. 5A illustrates an example of SIB1 evenly distributed in SSB periodicities according to some embodiments of the present disclosure;
[0025] FIG. 5B illustrates an example of according to some embodiments of the present disclosure;
[0026] FIG. 6A illustrates an example of according to some embodiments of the present disclosure;
[0027] FIG. 6B illustrates an example of according to some embodiments of the present disclosure;
[0028] FIG. 6C illustrates an example of according to some embodiments of the present disclosure;
[0029] FIG. 7 illustrates a flowchart illustrating an example of process for sparser SIB1 transmission according to some embodiments of the present disclosure;
[0030] FIG. 8 illustrates a flowchart of a method implemented at a terminal device according to some other embodiments of the present disclosure;
[0031] FIG. 9 illustrates a flowchart of a method implemented at a network device according to some other embodiments of the present disclosure;
[0032] FIG. 10 illustrates a simplified block diagram of an apparatus that is suitable for implementing embodiments of the present disclosure; and
[0033] FIG. 11 illustrates a block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
[0034] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0035] Principles 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.
[0036] 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.
[0037] 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.
[0038] 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.
[0039] The terminology used herein is for 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.
[0040] 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.
[0041] 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.
[0042] 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) and the sixth generation (6G) 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.
[0043] As used herein, the term “network device” and “access network device” refer 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 NR NB (also referred to as a gNB) , a transmission reception point (TRP) , 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.
[0044] 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 (IoT) 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.
[0045] FIG. 1A illustrates a schematic diagram of an example communication network 100 in which some embodiments of the present disclosure can be implemented. As shown in FIG. 1A, the communication network 100 may include terminal device 110, network device 120.
[0046] It is to be understood that the number of network devices and terminal devices is only for the purpose of illustration without suggesting any limitations. The system 100 may include any suitable number of network devices and terminal devices adapted for implementing embodiments of the present disclosure.
[0047] Communications in the communication system 100 may be implemented according to any proper communication protocol (s) , comprising, but not limited to, cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (5G) and the sixth generation (6G) and on the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and / or any other protocols currently known or to be developed in the future. Moreover, the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Division Multiple Access (CDMA) , Frequency Division Multiple Access (FDMA) , Time Division Multiple Access (TDMA) , Frequency Division Duplex (FDD) , Time Division Duplex (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Division Multiple (OFDM) , Discrete Fourier Transform spread OFDM (DFT-s-OFDM) and / or any other technologies currently known or to be developed in the future.
[0048] In the 3GPP network, the total number of simultaneously active beams is restricted by satellite level power. For example, the simultaneous active beams are 10.02%, 1.5%and 10.02%for different scenarios respectively. This determines the fraction of area that can be served under the satellite footprint. One way to increase the fraction of coverage area is to increase the number of simultaneous active beams. However, due to the power budget and number of RF chains available at the satellite payload, the number of active beams cannot be increased beyond certain limit. This eventually leads to the utilization of beam hopping.
[0049] In addition, based on the LEO600km Set1-2 FR1 (i.e., S-band) , if assuming dwell time of common control channels and dedicate data channel for every 4*16 beam footprints are both 10ms respectively, and the periodicity of common control channels (ms) for the N2 beam footprints is 160ms, then the number of served beam footprints can be derived as follows: 4×16×160÷20=512. The total number of beam footprints is 1058, therefore, the common control channel coverage ratio can be 48.393%. Based on the above result, in order to enlarge the common channel coverage ratio, the straightforward way is using wide beams then the number of beam footprints can be reduced accordingly.
[0050] FIG. 1B illustrates an example of occasion for SSB and SIB1. The UE may monitor the Type0-PDCCH for scheduling SIB1 according to the best received SSB, i.e., the highest SNR. And since the SSBs are all under the same cell, they will all be providing SIB1 carrying the same information content (cell configuration) , and hence it does not make any difference which SIB1 is received from UE or cell perspective.
[0051] Currently, there are wide beam-based solutions for the purpose of enlarging the common channel coverage ratio under restriction of maximum SSB periodicity (e.g., 160ms) . For example, a solution can configure CSI-RS or reference point of narrow beam in SIB1. Therefore, UE can measure or choose according to geographical information best beam and inform to gNB. And another solution can configure NCD-SSB (Non-cell defined SSB) in SIB1 and therefore, UE can measure NCD-SSB which transmit with narrow and report best beam to gNB.
[0052] However, both the above solutions use the same wide beam for transmitting SSB and SIB1, because the narrow beam need be configured in SIB1. FIG. 1C an example of use the same wide beam for transmitting SSB and SIB1.
[0053] In addition, if both SIB1 and SSB are transmitted with wide beam, the link budget margin of SSB is 5.59dB higher than Type0-PDCCH scheduling for SIB1. Furthermore, according to RP-243300, both PDCCH and PDSCH for SIB1 can be improved by link level enhancements. However, the SIB1 even has a loss of at least 3dB or 6dB depending on width of wide beam if transmission is with wide beam (compared to the situation of 2 or 4 smaller beams providing coverage) , which is not acceptable.
[0054] FIG. 1D an example of resource allocation for SSB and SIB1. As shown in FIG. 1D, with narrow beam maintain the same periodicity of SSB, e.g., 160ms, in the dwell time of common control channel, for instance, 4 times SIB1 repetitions than SSB (with the assumption that 4 narrow beams are associated to a wide beam) . Hence, the time domain resource in dwell time of common control channel cannot afford resource allocation for SIB1. For instance, consider the following parameters, dwell time of common control and data channel are 10ms (10 slots in case sub-carrier space of 15KHz) , 4 SSBs occupy 2 slots (2 SSBs per slot) , 4 SIBs with narrow beams per SSB occupy at least 2 slots, therefore, all SIB1 occupy at least 8 slots, there is not any remaining slots for SIB19.
[0055] According to some embodiments of the present disclosure, there is provided a solution for transmission with beams. With this solution, the SSB and the SIB1 are transmitted via the beams with different periodicities and coverage areas, thereby improving the performance of communication with the beams. Principles and embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.
[0056] FIG. 2 illustrates a flowchart illustrating an example of process for transmission with beams according to some embodiments of the present disclosure. For the purpose of discussion, the process 200 will be described with reference to FIG. 1A. The process 200 may involve the terminal device 110, the network device 120 as illustrated in FIG. 1A. It would be appreciated that although the process 200 for link has been described in the communication system 100 of FIG. 1A, this process may be likewise applied to other communication scenarios where different network devices are jointly deployed.
[0057] In some embodiments, the network device 120 transmit 202 to the terminal device 110, an SSB 204 via a first type of beam. And the terminal device 110 receives 206 the SSB with the first periodicity. Then the network device 120 transmits 208 to the terminal device 110, a SIB1 210 via a second type of beam, with a second periodicity, in an occasion associated with the transmission of the SSB. The terminal device 110 receives 212 the SIB1 210, with a second periodicity, in an occasion associated with the transmission of the SSB. The coverage area of the first type of beam is covered by a set of the second type of beams. The second periodicity is a multiple of the first periodicity. And a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0058] With the solution of the process, the solution for transmitting the SSB and the SIB1 via the beams with different periodicities and different beams is provided, thereby improving the performance of communication with beams.
[0059] In some embodiments, the SIB1 carried by type-0 physical downlink control channel (Type0-PDCCH) . Specifically, both the Type0-PDCCH (scheduling SIB1) and scheduled PDSCH carrying the SIB1 are referred as SIB1. Therefore, the solutions will apply equally to both the PDCCH and / or PDSCH of SIB1.
[0060] FIG. 3 illustrates an example of a plurality of narrow beams which will be splitting the satellite footprint covered by a wide beam according to some embodiments of the present disclosure. As shown in FIG. 3, the SSB geographical coverage is split into N partitions, each partition is covered by one narrow beam, where the N narrow beams provide the same or similar geographical coverage as the associated SSB wide beam. SIB1 is transmitted with narrow beam. To maintain the same control signaling overhead, the periodicity of SIB1 of each narrow beam is extended to N times the wide cell SSB periodicity.
[0061] FIG. 4 illustrates an example of a sketch of a physical layer procedure for initial access with sparser SIB1 transmission from gNB perspective according to some embodiments of the present disclosure. As shown in FIG. 4, the gNB transmits Cell-defined SSB (CD-SSB) with wide beam that covers the one satellite footprint, and UE receives the SSB and get the downlink synchronization. Then the gNB transmits Type0-PDCCH and PDSCH conveying SIB1 message with different options as described below.
[0062] FIG. 5A illustrates an example of example of SIB1 evenly distributed in SSB periodicities according to some embodiments of the present disclosure.
[0063] In some embodiments, the SIB1 is transmitted via multiple beams with the second type, a first beam with the second type is transmitted after a first transmission of the SSB during a first period of the first periodicity. And a second beam with the second type is transmitted after a second transmission of the SSB during a second period of the first periodicity. In other word, a first occasion of the SIB1 is following a first transmission of the SSB during a first period of the first periodicity. And a second occasion of the SIB1 is following a second transmission of the SSB during a second period of the first periodicity.
[0064] Specifically, as shown in FIG. 5A, each SIB1 transmission with narrow beam follows each wide beam SSB transmission (one-one mapping) . In the pattern, each N times SIB1 transmissions will cover the whole footprint covered by the wider beam. With this option, the UE is naturally monitoring Type0-PDCCH which is for the scheduling of SIB1 with different narrow beams. In some embodiments, the Type0-PDCCH search space for different narrow beam is following SSB beam index.
[0065] In some embodiment, the SIB1 comprises an index of a beam associated with the SIB1. Specifically, in order for the UE to understand the narrow beam index the UE has found (i.e. PDCCH and PDSCH carrying SIB1 successfully decoded) , information of the narrow beam index used for the transmission needs to be added in SIB1.
[0066] In some embodiment, an index of a beam associated with the SIB1 is associated with a time interval. Specifically, the index of the beam is indicated implicitly. A narrow beam index is associated with an interval of time, e.g. for SFN from 0 to 16, beam index #0 is transmitted.
[0067] In some embodiment, the SIB1 comprises information of a relationship between the index of a beam associated with the SIB1 and the time interval. Specifically, transmitted beam indexes and time relationship can be further indicated via SIB1.
[0068] FIG. 5B illustrates an example of SIB1 occasion for 4 SSB footprints crossing 4 SSB period according to some embodiments of the present disclosure. As shown in FIG. 5B, in the dwell common channel time (10 slots) , 4 SSBs with 4 satellite footprints, in one dwell time within SSB period, the only one SIB1 with narrow beam associated with 1 SSB (wide beam) is transmitted. The 4 beam#0 in FIG. 5B are different, each belonging to a different wide beam. Actually they are associated to the 4 SSBs respectively (the wide beam of each SSB is different which may be corresponding to different satellite footprints) .
[0069] FIG. 6A illustrates an example of extended SIB1 periodicity for one SSB in case of multiple SSBs within one SSB period according to some embodiments of the present disclosure. Specifically, all the narrow beams of SIB1 repetitions associated to one SSB are transmitted after the SSB transmission within a same SSB period (one-to-N mapping) . The narrow beams of SIB1 associated to multiple SSBs are evenly distributed in occasions during extended SIB1 periodicity. The benefit of the option is smaller latency for SIB1 reception.
[0070] In some embodiments, additional monitoring occasions for SIB1 may be defined (for a same or different search space) each monitoring occasion corresponding to a specific narrow beam index.
[0071] In some embodiments, each monitoring occasion may be used by any beam index, and beam index information is added to the SIB1 or indicated separately to the UE.
[0072] FIG. 6B illustrates an example of 4 SIB1 beams for 1 SSB with total 4 SSB footprints during one SSB period according to some embodiments of the present disclosure.
[0073] In some embodiment, a number of occasions of the SIB1 are following a transmission of the SSB during a period of the first periodicity. In other word, the SIB1 is transmitted via multiple beams with the second type, and the multiple beams are transmitted after a transmission of the SSB during a period of the first periodicity.
[0074] Specifically, as shown in FIG. 6B, in the dwell common channel time (10 slots shown as following figure) , 4 SSBs with 4 satellite footprints, the corresponding SIB1 with 4 narrow beams may be extended in one dwell time. In total there are 16 different narrow beams, and every 4 narrow beams are associated to one SSB. In each SSB period, all the 4 narrow beams associated to an SSB are used for the 4 transmissions of SIB1 corresponding to this SSB.
[0075] FIG. 6C illustrates an example of 2 SIB1 beams for 1 SSB with total 4 SSB footprints during one SSB period according to some embodiments of the present disclosure.
[0076] In some embodiments, a number of occasions of the SIB1 corresponding to a first set of SSBs are following transmissions of a first set of SSB during a first period of the first periodicity, and a number of occasions of the SIB1 corresponding to a second set of SSBs are transmitted after transmissions of the second set of SSBs during a second period of the first periodicity. In other word, a multiple of beams with the second type associated with a first set of the SSBs are transmitted after the transmissions of the first set of the SSBs, and a multiple of beams with the second type associated with a second set of the SSBs are transmitted after the transmissions of the second set of the SSB.
[0077] Specifically, as shown in FIG. 6C, in the dwell common channel time (10 slots shown as following figure) , 4 SSBs with 4 satellite footprints, the corresponding SIB1 with 2 narrow beams may be extended in one dwell time. in total there are 8 narrow beams corresponding to the 4 SSBs. Two narrow beams are associated to one SSB. beam#0 and beam#1 of the first SSB period is associated to SSB#0, beam#2 and beam#3 of the first SSB period is associated to SSB#1, beam#0 and beam#1 of the 2nd SSB period is associated to SSB#2, beam#2 and beam#3 of the 2nd SSB period is associated to SSB#3.
[0078] In some embodiments, the UE skips a rest of the monitoring occasion of the SIB1 based on determining that the SIB1 is decoded successfully. The SIB1 comprises a number of beams associated with the SIB1. Specifically, the number of SIB1 narrow beams associated to one wide beam may be configured in SIB1 message. Once UE decodes SIB1 successfully, then the rest of SIB1 occasions within the narrow beam period can be skipped, the narrow beam index can be derived from the receiving occasion (in time, SFN or other time wise related parameters) .
[0079] In some embodiments, the different beams associated with the SIB1 have different second periodicities. Specifically, the periodicity of SIB1 of different narrow beams may be configured in SIB1 message, thus the gNB may configure different periodicities for different SIB1 narrow beams according to traffic load.
[0080] In some embodiments, the terminal device decodes a number of the received SIB1, and select a beam associated with the SIB1 with a highest quality according to a threshold. The SIB1 comprises a threshold for selecting a beam with the highest quality associated with the SIB1. The threshold of SIB RSRP or SINR is configured in SIB1 message, it is beneficial for UE to choose the highest quality beam for subsequent preamble (Msg1) transmission. gNB may transmit Rach Access Response / Contention Resolution (called Msg2 / 4) with highest quality beam indicated by preamble (Msg1) .
[0081] Below is an example of the parameters in SIB1 for assistance of sparser SIB1 reception as described above. numberOfSib1Beams-r19: the number of SIB1 beams sib1-NarrowBeamIndex-r1: the narrow beam index of SIB1 sib1-BeamPeriodicity-r19: the periodicity of one SIB1 beam sib1-BeamPeriodicityList-r19: the periodicity list for all number of SIB1 beams sib1BeamSelectThresholdRsrp-r19: the threshold for SIB1 beam selection
[0082] Refer back to FIG. 4, the UE selects the best narrow beam based on the SIB1 reception and transmit Msg1 in RACH occasion based on selected best narrow beam. Then the gNB transmits Msg2 / 4 transmission with narrow that is indicated by Msg1.
[0083] FIG. 7 illustrates a flowchart illustrating an example of process for sparser SIB1 transmission according to some embodiments of the present disclosure. The UE 701 is an example of the terminal device 110 in FIG. 1A. The gNB 703 is an example of the network device 120 in FIG. 1A.
[0084] At 702, the gNB 703 transmits the SSB / PBCH block with wide beam in first 160ms. At 704, UE 701 is monitoring SS / PBCH block in each 160ms (SSB periodicity) . At 706, the gNB 703 transmits the SIB1 with narrow beam #0 corresponding SSB during the same 5ms as SSB.
[0085] At 708, after obtaining DL synchronization from SSB, the UE 701 is monitoring Type0-PDCCH to decode SIB1. In the first occasion, the UE 701 fails to decode SIB1 with beam #0. At 710, the gNB 703 transmits SS / PBCH block with wide beam in second 160ms. At 712, the gNB 703 transmits SIB1 with narrow beam #1 corresponding SSB during the same 5ms as SSB.
[0086] At 714, the UE 701 is continue monitoring Type0-PDCCH. At 716, the UE 701 decodes SIB1 successfully and obtain the parameters of sib1-NarrowBeamIndex-r19, numberOfSib1Beams-r19, sib1BeamSelectThresholdRsrp-r19. Meanwhile, the measured RSRP fulfills the threshold configured in the SIB. It is noted that there is no logical conflict here, as the UE 701 is able to decode the SIB1, and therefore able to obtain the needed RSRP threshold of the SIB1 selection mechanism. At 718, the measured RSRP fulfills the threshold configured in the SIB, the narrow beam #1 is selected for Msg1. At 720, the gNB 703 transmits SS / PBCH block with wide beam in second 160ms. At 722, the gNB 703 transmits SIB1 with narrow beam #2 corresponding SSB during the same 5ms as SSB.
[0087] At 724, the UE 701 stops monitoring the rest occasion of Type0-PDCCH within the number of SIB1 beams. At 726, the gNB 703 transmits SS / PBCH block with wide beam in second 160ms. At 728, the gNB 703 transmits SIB1 with narrow beam #3 corresponding SSB during the same 5ms as SSB. At 730, beam#1 is chosen for RACH Occasion (RO) of preamble transmission. At 732, the Msg1 is transmitted in RO corresponding to narrow beam #1.
[0088] In view of the above description of the various embodiments of the present disclosure, these embodiments of the present disclosure provide different alternative solutions for transmitting SIB1 with repetitions for a plurality of narrow beams which will be splitting the satellite footprint covered by a wide beam into a plurality of partitions and extending the SIB1 periodicity based on periodicity of SSB which is transmitted with a wide beam. Advantage of the solutions is maintaining the SIB1 link budget in case of SSB transmission with wide beam to fulfill the requirement of restricting the maximum number of simultaneous active beams. And additionally the issue of the coverage and control channel overhead of SIB1 is solved.
[0089] FIG. 8 shows a flowchart of an example method 800 implemented at a terminal 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 terminal device 110 with reference to FIG. 1A.
[0090] At block 810, the terminal device 110 receives receive from a network device, an SSB with a first periodicity. At block 820, the terminal device 110 receives from the network device, a system information block type one (SIB1) , with a second periodicity, in an occasion associated with the transmission of the SSB. The second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0091] In some embodiments, a first occasion of the SIB1 is following a first transmission of the SSB during a first period of the first periodicity, a second occasion of the SIB1 is following a second transmission of the SSB during a second period of the first periodicity. In some embodiments, a number of occasions of the SIB1 are following a transmission of the SSB during a period of the first periodicity. In some embodiments, a number of occasions of the SIB1 corresponding to a first set of SSBs are following transmissions of a first set of SSB during a first period of the first periodicity, and a number of occasions of the SIB1 corresponding to a second set of SSBs are transmitted after transmissions of the second set of SSBs during a second period of the first periodicity. In some embodiments, an index of a beam associated with the SIB1 is associated with a time interval. In some embodiments, an index of a beam associated with the SIB1 is associated with a monitoring occasion of the SIB1.
[0092] In some embodiments, the terminal device 110 skips a rest of the monitoring occasion of the SIB1 based on determining that the SIB1 is decoded successfully. In some embodiments, the terminal device decodes a number of the received SIB1, and selects a beam associated with the SIB1 with a highest quality according to a threshold. In some embodiments, the different beams associated with the SIB1 have different second periodicities. In some embodiments, the SIB1 comprises at least one of an index of a beams associated with the SIB1, information of a relationship between the index of a beam associated with the SIB1 and the time interval, information of the second periodicity, a number of beams associated with the SIB1, or a threshold for selecting a beam with the highest quality associated with the SIB1. In some embodiments, the SIB1 further comprises scheduling information for SIB1 carried by type-0 physical downlink control channel (Type0-PDCCH) . In some embodiments, the number of the SIB1 during the second periodicity is two or four multiples of the number of SSB during the first periodicity. In some embodiments, a coverage area of the beam associated with the SSB is covered by a set of beams associated with the SIB1.
[0093] FIG. 9 shows a flowchart of an example method 900 implemented at a network device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 900 will be described from the perspective of the network device 120 with reference to FIG. 1A.
[0094] At block 910, the network device 120 transmits to a terminal device, a synchronization signal and physical broadcast channel block (SSB) via a first type of beam with a first periodicity. At block 920, the network device 120 transmits to the terminal device, a system information block type one (SIB1) via a second type of beam, with a second periodicity, in an occasion associated with the transmission of the SSB. And a coverage area of the first type of beam is covered by a set of the second type of beams, the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0095] In some embodiments, the SIB1 is transmitted via multiple beams with the second type, a first beam with the second type is transmitted after a first transmission of the SSB during a first period of the first periodicity, a second beam with the second type is transmitted after a second transmission of the SSB during a second period of the first periodicity. In some embodiments, the SIB1 is transmitted via multiple beams with the second type, wherein the multiple beams are transmitted after a transmission of the SSB during a period of the first periodicity. In some embodiments, a multiple of beams with the second type associated with a first set of the SSBs are transmitted after the transmissions of the first set of the SSBs, and a multiple of beams with the second type associated with a second set of the SSBs are transmitted after the transmissions of the second set of the SSB. In some embodiments, an index of a beam with the second type is associated with a time interval.
[0096] In some embodiments, an index of a beam with the second type is associated with a monitoring occasion of the SIB1. In some embodiments, different beams with the second type have different second periodicities. In some embodiments, the SIB1 comprises at least one of an index of a beams with the second type, information of a relationship between the index of a beam with the second type and the time interval, information of the second periodicity, a number of beams with the second type, or a threshold for selecting a beam associated with the SIB1with the highest quality. In some embodiments, the number of the SIB1 during the second periodicity is two or four multiples of the number of SSB during the first periodicity. In some embodiments, the SIB1 further comprises scheduling information for SIB1 carried by type-0 physical downlink control channel (Type0-PDCCH) with the second type of beam.
[0097] In some embodiments, an apparatus capable of performing any of the method 800 (for example, the terminal device 110) may comprise 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.
[0098] The apparatus comprises means for receiving, from a network device, a synchronization signal and physical broadcast channel block (SSB) with a first periodicity. The apparatus comprises means for receiving, from the network device, a system information block type one (SIB1) , with a second periodicity, in an occasion associated with the transmission of the SSB. And the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0099] In some embodiments, a first occasion of the SIB1 is following a first transmission of the SSB during a first period of the first periodicity, a second occasion of the SIB1 is following a second transmission of the SSB during a second period of the first periodicity. In some embodiments, a number of occasions of the SIB1 are following a transmission of the SSB during a period of the first periodicity. In some embodiments, a number of occasions of the SIB1 corresponding to a first set of SSBs are following transmissions of a first set of SSB during a first period of the first periodicity, and a number of occasions of the SIB1 corresponding to a second set of SSBs are transmitted after transmissions of the second set of SSBs during a second period of the first periodicity. In some embodiments, an index of a beam associated with the SIB1 is associated with a time interval. In some embodiments, an index of a beam associated with the SIB1 is associated with a monitoring occasion of the SIB1.
[0100] In some embodiments, the apparatus comprises means for skipping a rest of the monitoring occasion of the SIB1 based on determining that the SIB1 is decoded successfully. In some embodiments, the apparatus comprises means for decoding a number of the received SIB1, and selecting a beam associated with the SIB1 with a highest quality according to a threshold. In some embodiments, the different beams associated with the SIB1 have different second periodicities. In some embodiments, the SIB1 comprises at least one of an index of a beam associated with the SIB1, information of a relationship between the index of a beam associated with the SIB1 and the time interval, information of the second periodicity, a number of beams associated with the SIB1, or a threshold for selecting a beam with the highest quality associated with the SIB1. In some embodiments, the SIB1 further comprises scheduling information for SIB1 carried by type-0 physical downlink control channel (Type0-PDCCH) . In some embodiments, the number of the SIB1 during the second periodicity is two or four multiples of the number of SSB during the first periodicity. In some embodiments, a coverage area of the beam associated with the SSB is covered by a set of beams associated with the SIB1.
[0101] In some embodiments, the apparatus further comprises means for performing other steps in some embodiments of the method 800. In some embodiments, the means comprises 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.
[0102] In some embodiments, an apparatus capable of performing any of the method 900 (for example, the network device 120) may comprise means for performing the respective steps of the method 900. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0103] In some embodiments, the apparatus comprises means for transmitting, to a terminal device, a synchronization signal and physical broadcast channel block (SSB) via a first type of beam with a first periodicity. The apparatus comprises means for transmitting, to the terminal device, a system information block type one (SIB1) via a second type of beam, with a second periodicity, in an occasion associated with the transmission of the SSB. And a coverage area of the first type of beam is covered by a set of the second type of beams, the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.
[0104] In some embodiments, the SIB1 is transmitted via multiple beams with the second type, a first beam with the second type is transmitted after a first transmission of the SSB during a first period of the first periodicity, a second beam with the second type is transmitted after a second transmission of the SSB during a second period of the first periodicity. In some embodiments, the SIB1 is transmitted via multiple beams with the second type, wherein the multiple beams are transmitted after a transmission of the SSB during a period of the first periodicity. In some embodiments, a multiple of beams with the second type associated with a first set of the SSBs are transmitted after the transmissions of the first set of the SSBs, and a multiple of beams with the second type associated with a second set of the SSBs are transmitted after the transmissions of the second set of the SSB. In some embodiments, an index of a beam with the second type is associated with a time interval.
[0105] In some embodiments, an index of a beam with the second type is associated with a monitoring occasion of the SIB1. In some embodiments, different beams with the second type have different second periodicities. In some embodiments, the SIB1 comprises at least one of an index of a beam with the second type, information of a relationship between the index of a beam with the second type and the time interval, information of the second periodicity, a number of beams with the second type, or a threshold for selecting a beam associated with the SIB1with the highest quality. In some embodiments, the number of the SIB1 during the second periodicity is two or four multiples of the number of SSB during the first periodicity. In some embodiments, the SIB1 further comprises scheduling information for SIB1 carried by type-0 physical downlink control channel (Type0-PDCCH) with a second type of beam.
[0106] In some embodiments, the apparatus further comprises means for performing other steps in some embodiments of the method 900. In some embodiments, the means comprises 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.
[0107] FIG. 10 is a simplified block diagram of a device 1000 that is suitable for implementing embodiments of the present disclosure. The device 1000 may be provided to implement the communication device, for example the terminal device 110, the network device 120 as shown in FIG. 1A. As shown, the device 1000 includes one or more processors 1010, one or more memories 1020 coupled to the processor 1010, and one or more communication modules 1040 coupled to the processor 1010.
[0108] The communication module 1040 is for bidirectional communications. The communication module 1040 has at least one antenna to facilitate communication. The communication interface may represent any interface that is necessary for communication with other network elements.
[0109] The processor 1010 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 examples. The device 1000 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.
[0110] The memory 1020 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) 1024, 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) 1022 and other volatile memories that will not last in the power-down duration.
[0111] A computer program 1030 includes computer executable instructions that are executed by the associated processor 1010. The program 1030 may be stored in the ROM 1024. The processor 1010 may perform any suitable actions and processing by loading the program 1030 into the RAM 1022.
[0112] The embodiments of the present disclosure may be implemented by means of the program 1030 so that the device 1000 may perform any process of the disclosure as discussed with reference to FIGS. 2 to 8. The embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
[0113] In some embodiments, the program 1030 may be tangibly contained in a computer readable medium which may be included in the device 1000 (such as in the memory 1020) or other storage devices that are accessible by the device 1000. The device 1000 may load the program 1030 from the computer readable medium to the RAM 1022 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. 11 shows an example of the computer readable medium 1100 in form of CD or DVD. The computer readable medium has the program 1030 stored thereon.
[0114] Generally, various embodiments of the present 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 embodiments of the present 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 examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
[0115] The present 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 800-900 as described above with reference to FIGS. 8-9. 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 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.
[0116] Program code for carrying out methods of the present 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.
[0117] In the context of the present disclosure, the computer program codes 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.
[0118] 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 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 (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs.ROM) .
[0119] 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 the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.
[0120] Although the present disclosure has been described in languages specific to structural features and / or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily 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 claims.
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 synchronization signal and physical broadcast channel block (SSB) with a first periodicity; andreceive, from the network device, a system information block type one (SIB1) , with a second periodicity, in an occasion associated with the transmission of the SSB ,wherein the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.2.The terminal device of claim 1, wherein a first occasion of the SIB1 is following a first transmission of the SSB during a first period of the first periodicity, a second occasion of the SIB1 is following a second transmission of the SSB during a second period of the first periodicity.3.The terminal device of claim 1, wherein a number of occasions of the SIB1 are following a transmission of the SSB during a period of the first periodicity.4.The terminal device of claim 1, wherein a number of occasions of the SIB1 corresponding to a first set of SSB are following transmissions of a first set of SSB during a first period of the first periodicity, and a number of occasions of the SIB1 corresponding to a second set of SSB are transmitted after transmissions of the second set of SSBs during a second period of the first periodicity.5.The terminal device of any of claims 1 to 4, wherein an index of a beam associated with the SIB1 is associated with a time interval.6.The terminal device of any of claims 1 to 4, wherein an index of a beam associated with the SIB1 is associated with a monitoring occasion of the SIB1.7.The terminal device of any of claims 1 to 6 wherein the terminal device is further caused to:skip a rest of the monitoring occasion of the SIB1 based on determining that the SIB1 is decoded successfully.8.The terminal device of any of claims 1 to 6 wherein the terminal device is further caused to:decode a number of the received SIB1;select a beam associated with the SIB1 with a highest quality according to a threshold.9.The terminal device of any of claims 1 to 8 wherein the different beams associated with the SIB1 have different second periodicities.10.The terminal device of any of claims 1 to 9, wherein the SIB1 comprises at least one of the following:an index of a beam associated with the SIB1;information of a relationship between the index of a beam associated with the SIB1 and the time interval;information of the second periodicity;a number of beams associated with the SIB1; ora threshold for selecting a beam with the highest quality associated with the SIB1.11.The terminal device of any of claims 1 to 10, wherein the SIB1 further comprises scheduling information for SIB1 carried by type-0 physical downlink control channel (Type0-PDCCH) .12.The terminal device of any of claims 1 to 11, wherein the number of the SIB1 during the second periodicity is two or four multiples of the number of SSB during the first periodicity.13.The terminal device of any of claims 1 to 12, wherein a coverage area of the beam associated with the SSB is covered by a set of beams associated with the SIB1.14.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 synchronization signal and physical broadcast channel block (SSB) via a first type of beam with a first periodicity; andtransmit, to the terminal device, a system information block type one (SIB1) via a second type of beam, with a second periodicity, in an occasion associated with the transmission of the SSB ,wherein a coverage area of the first type of beam is covered by a set of the second type of beams, the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.15.The network device of claim 14, wherein the SIB1 is transmitted via multiple beams with the second type, a first beam with the second type is transmitted after a first transmission of the SSB during a first period of the first periodicity, a second beam with the second type is transmitted after a second transmission of the SSB during a second period of the first periodicity.16.The network device of claim 14, wherein the SIB1 is transmitted via multiple beams with the second type, wherein the multiple beams are transmitted after a transmission of the SSB during a period of the first periodicity.17.The network device of claim 14, wherein a multiple of beams with the second type associated with a first set of the SSBs are transmitted after the transmissions of the first set of the SSBs, and a multiple of beams with the second type associated with a second set of the SSBs are transmitted after the transmissions of the second set of the SSB.18.The network device of any of claims 14 to 17, wherein an index of a beam with the second type is associated with a time interval.19.The network device of any of claims 14 to 17, wherein an index of a beam with the second type is associated with a monitoring occasion of the SIB1.20.The network device of any of claims 13 to 19, wherein different beams with the second type have different second periodicities.21.The network device of any of claims 14 to 20, wherein the SIB1 comprises at least one of the following:an index of a beam with the second type;information of a relationship between the index of a beam with the second type and the time interval;information of the second periodicity;a number of beams with the second type; ora threshold for selecting a beam associated with the SIB1with the highest quality.22.The network device of any of claims 14 to 21, wherein the number of the SIB1 during the second periodicity is two or four multiples of the number of SSB during the first periodicity.23.The network device of any of claims 14 to 22, wherein the SIB1 further comprises scheduling information for SIB1 carried by type-0 physical downlink control channel (Type0-PDCCH) with the second type of beam.24.A method comprising:receiving, from a network device, a synchronization signal and physical broadcast channel block (SSB) with a first periodicity; andreceiving, from the network device, a system information block type one (SIB1) , with a second periodicity, in an occasion associated with the transmission of the SSB,wherein the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.25.A method comprising:transmitting, to a terminal device, a synchronization signal and physical broadcast channel block (SSB) via a first type of beam with a first periodicity; andtransmitting, to the terminal device, a system information block type one (SIB1) via a second type of beam, with a second periodicity, in an occasion associated with the transmission of the SSB,wherein a coverage area of the first type of beam is covered by a set of the second type of beams, the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.26.An apparatus comprising:means for receiving, from a network device, a synchronization signal and physical broadcast channel block (SSB) with a first periodicity; andmeans for receiving, from the network device, a system information block type one (SIB1) , with a second periodicity, in an occasion associated with the transmission of the SSB,wherein the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.27.An apparatus comprising:means for transmitting, to a terminal device, a synchronization signal and physical broadcast channel block (SSB) via a first type of beam with a first periodicity; andmeans for transmitting, to the terminal device, a system information block type one (SIB1) via a second type of beam, with a second periodicity, in an occasion associated with the transmission of the SSB,wherein a coverage area of the first type of beam is covered by a set of the second type of beams, the second periodicity is a multiple of the first periodicity, and a number of the SIB1 during the second periodicity is an integer multiple of a number of SSB during the first periodicity.28.A computer readable medium comprising program instructions that, when executed by an apparatus, cause the apparatus to perform at least the method of claim 24 or 25.