WO2024045925A1 - 卫星通信方法及装置 - Google Patents

卫星通信方法及装置 Download PDF

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Publication number
WO2024045925A1
WO2024045925A1 PCT/CN2023/107929 CN2023107929W WO2024045925A1 WO 2024045925 A1 WO2024045925 A1 WO 2024045925A1 CN 2023107929 W CN2023107929 W CN 2023107929W WO 2024045925 A1 WO2024045925 A1 WO 2024045925A1
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Prior art keywords
window
sub
mos
ssb
message
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PCT/CN2023/107929
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English (en)
French (fr)
Inventor
王晖
廖树日
窦圣跃
胡星星
张佳胤
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华为技术有限公司
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Publication of WO2024045925A1 publication Critical patent/WO2024045925A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present application relates to the field of communication technology, and in particular, to a satellite communication method and device.
  • the satellite's ephemeris (also called ephemeris information) is information such as a list of position data of artificial satellites at various times, and is often used in the global positioning system (GPS). For example, in order to calculate the position of a point from GPS observations, the three-dimensional coordinates of the satellite observation time must be known. This observation time is the reference time of the ephemeris. Satellite ephemeris provides orbital parameters, and ephemeris can be used to determine the satellite's coordinates. In satellite communications, due to the long distance between the satellite and the ground, the air interface delay is large.
  • the terminal equipment needs to accurately know the position of the satellite at each moment to calculate the timing advance in advance, so as to ensure the uplink and downlink synchronization of the initial access process.
  • the process went smoothly.
  • the delay jitter and Doppler frequency deviation caused by the fast movement of low earth orbit (LEO) satellites will greatly affect the communication quality.
  • the satellite In order for the ground terminal to accurately correct the time and frequency offset, the satellite needs to send its own orbit information and position information to the user.
  • the current method for a terminal device to obtain ephemeris information can be as follows: the terminal device first obtains a certain system information (SI) message that the terminal device can receive through the system information blocks (SIB) 1, and then The time domain position and length of the SI window corresponding to the certain SI message and the SIB corresponding to the certain SI message; through the above information, the terminal device blindly detects the SI message and the SIB corresponding to the SI message within the SI window, thereby Obtain ephemeris information based on SIB.
  • SI system information
  • SIB system information blocks
  • Embodiments of the present application provide a satellite communication method and device, which can effectively improve the detection efficiency of terminal equipment.
  • embodiments of the present application provide a satellite communication method, which method includes:
  • the broadcast message includes indication information
  • the indication information is used to indicate that a system information (SI) window includes Nw sub-windows, and each sub-window in the Nw sub-windows corresponds to an SI message,
  • SI system information
  • At least one SI message among the Nw SI messages includes ephemeris information, and Nw is an integer greater than or equal to 2; the Nw SI messages are detected based on the broadcast message.
  • one SI window corresponds to one SI message
  • the SI window is often relatively large in non-terrestrial networks (NTN) communication systems. Therefore, when one SI window corresponds to one SI message, it will affect the detection overhead of the terminal device, causing the terminal device to detect an SI message within a relatively large SI window. This not only wastes the detection overhead of the terminal device, but also makes the detection efficiency low.
  • NTN non-terrestrial networks
  • an SI window is divided into Nw sub-windows, and each sub-window corresponds to an SI message. Therefore, the terminal device can obtain SIB19 in at least one SI message, and the length of the sub-window corresponding to the SI message is less than SI window, therefore, can effectively improve the detection efficiency of terminal equipment and improve the efficiency of detecting SIB19.
  • each sub-window corresponds to an SI message, so that one SI window can include multiple SI messages.
  • the multiple SI messages can correspond to different types of SIBs, which improves the flexibility of configuration.
  • the monitoring occasions (MO) in each sub-window correspond to a group of MOs in every M system frames (SF) in the SI window, and the M is an integer greater than or equal to 2.
  • each of the M SFs includes a first group of MOs, and the first group of MOs satisfies at least one of the following conditions: the MOs in the first group of MOs correspond to the same SF; The MOs in the first group of MOs correspond to at least two SFs.
  • the first group of MOs includes MOs corresponding to SIB19 in SFs indexed by even numbers.
  • the MOs corresponding to SIB19 in the even-indexed SF are divided into a group, so that the MOs in the corresponding sub-windows of the group can be the MOs in which the network device sends SIB19, which not only ensures that the UE can quickly SIB19 is detected, and since each MO in the group corresponds to SIB19, the detection efficiency is effectively improved and detection resources can be saved.
  • the MO index in each sub-window is determined by extracting a group of MOs from every M SFs in the SI window and then numbering them in ascending order.
  • the UE by extracting the MOs in the SI window and arranging them in ascending order of numbers, the UE can obtain the synchronization signal block (SSB) it received based on a certain formula. Corresponding to SIB19.
  • SSB synchronization signal block
  • the period of the SSB is equal to the window length of the SI window.
  • the SSB period is equal to the window length of the SI window, thereby effectively improving the situation where detection resources are wasted when the SSB period is not equal to the SI window length.
  • an SI window includes multiple sub-windows, and each sub-window can correspond to one SI message, so that one SI window can include multiple SI messages.
  • these multiple SI messages can correspond to different types of SIBs. Improved configuration flexibility.
  • the value of M is determined according to the pattern of the SSB.
  • the broadcast message further includes at least one of the following information: the time-frequency resource of the SI window, the index of the SI message corresponding to each sub-window in the Nw sub-window, the corresponding System Information Block SIB.
  • the broadcast message further includes at least one of the following information: the offset of each group of MOs in each M SF relative to the starting position of each M SF, the offset of each group of MOs in each M SF, The window length of the group MO and the value of M (which can also be called the period of each group of MO).
  • embodiments of the present application provide a satellite communication method, which method includes:
  • the SI window includes Nw sub-windows; send a broadcast message, the broadcast message includes indication information, the indication information is used to indicate that an SI window includes Nw sub-windows, and the Nw sub-windows
  • Each sub-window corresponds to an SI message, and at least one SI message among the Nw SI messages includes ephemeris information, and Nw is an integer greater than or equal to 2.
  • the MO in each sub-window corresponds to a group of MOs in every M system frames SF in the SI window, where M is an integer greater than or equal to 2.
  • each of the M SFs includes a first group of MOs, and the first group of MOs satisfies at least one of the following conditions: the MOs in the first group of MOs correspond to the same SF; The MOs in the first group of MOs correspond to at least two SFs.
  • the first group of MOs includes MOs corresponding to SIB19 in SFs indexed by even numbers.
  • the MO index in each sub-window is determined by extracting a group of MOs from every M SFs in the SI window and then numbering them in ascending order.
  • the period of the SSB is equal to the window length of the SI window.
  • the value of M is determined according to the pattern of the SSB.
  • the broadcast message also includes at least one of the following information: the time-frequency resource of the SI window, the index of the SI message corresponding to each sub-window in the Nw sub-window, each SI message The corresponding system information block SIB.
  • the broadcast message further includes at least one of the following information: the offset of each group of MOs in each M SF relative to the starting position of each M SF, the offset of each group of MOs in each M SF, The window length of the group MO and the value of M (which can also be called the period of each group of MO).
  • the Nw is determined based on the total number of MOs in the SI window and the total number of synchronization signal blocks SSB in the SI window.
  • the Nw is less than or equal to Nmax, and the Nmax satisfies the following conditions:
  • the S MO represents the total number of MOs in the SI window
  • the N represents the total number of synchronization signal blocks SSB in the SI window.
  • embodiments of the present application provide a communication device for performing the method in the first aspect or any possible implementation of the first aspect.
  • the communication device includes means for performing a method in the first aspect or in any possible implementation of the first aspect.
  • the communication device may include a processing unit and a transceiver unit.
  • embodiments of the present application provide a communication device for performing the method in the second aspect or any possible implementation of the second aspect.
  • the communication device includes means for performing the method of the second aspect or any possible implementation of the second aspect.
  • the communication device may include a processing unit and a transceiver unit.
  • inventions of the present application provide a communication device.
  • the communication device includes a processor, configured to execute the method shown in the above-mentioned first aspect or any possible implementation of the first aspect.
  • the processor is configured to execute a program stored in the memory. When the program is executed, the method shown in the above first aspect or any possible implementation of the first aspect is executed.
  • the memory is located outside the communication device.
  • the memory is located within the communication device.
  • the processor and the memory can also be integrated into one device, that is, the processor and the memory can also be integrated together.
  • the communication device further includes a transceiver, and the transceiver is used to receive signals and/or send signals.
  • embodiments of the present application provide a communication device, which includes a processor configured to execute the method shown in the above second aspect or any possible implementation of the second aspect.
  • the processor is configured to execute a program stored in the memory. When the program is executed, the method shown in the above second aspect or any possible implementation of the second aspect is executed.
  • the memory is located outside the communication device.
  • the memory is located within the communication device.
  • the processor and the memory can also be integrated into one device, that is, the processor and the memory can also be integrated together.
  • the communication device further includes a transceiver, and the transceiver is used to receive signals and/or send signals.
  • inventions of the present application provide a communication device.
  • the communication device includes a logic circuit and an interface.
  • the logic circuit is coupled to the interface.
  • the interface is used to input broadcast messages.
  • the logic circuit is used to input broadcast messages. Nw SIs are detected based on the broadcast message.
  • the interface is also used to input SSB.
  • inventions of the present application provide a communication device.
  • the communication device includes a logic circuit and an interface.
  • the logic circuit is coupled to the interface.
  • the logic circuit is used to determine Nw sub-windows included in an SI window. ;
  • the interface is used to output broadcast messages.
  • the interface is also used to output SSB.
  • embodiments of the present application provide a computer-readable storage medium, which is used to store a computer program. When it is run on a computer, it enables any possibility of the first aspect or the first aspect mentioned above. The implementation shown in the method is executed.
  • embodiments of the present application provide a computer-readable storage medium.
  • the computer-readable storage medium is used to store a computer program. When it is run on a computer, it enables any possibility of the above second aspect or the second aspect. The implementation shown in the method is executed.
  • inventions of the present application provide a computer program product.
  • the computer program product includes a computer program or computer code (or instructions). When run on a computer, the computer program product enables the above-mentioned first aspect or the first aspect. Any possible implementation of the method shown is executed.
  • inventions of the present application provide a computer program product.
  • the computer program product includes a computer program or computer code (or instructions). When run on a computer, the computer program product makes the above second aspect or the second aspect Any possible implementation of the method shown is executed.
  • embodiments of the present application provide a computer program.
  • the computer program When the computer program is run on a computer, the method shown in the above first aspect or any possible implementation of the first aspect is executed.
  • embodiments of the present application provide a computer program.
  • the computer program When the computer program is run on a computer, the method shown in the above second aspect or any possible implementation of the second aspect is executed.
  • inventions of the present application provide a communication system.
  • the communication system includes a terminal device and a network device.
  • the terminal device is configured to perform the method shown in the above first aspect or any possible implementation of the first aspect.
  • the network device is configured to perform the method shown in the above second aspect or any possible implementation of the second aspect.
  • Figure 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application.
  • Figure 2a is a schematic diagram of a satellite communication system in a transparent transmission scenario provided by an embodiment of the present application
  • Figure 2b is a schematic diagram of a satellite communication system in a regeneration scenario provided by an embodiment of the present application
  • Figure 2c is a schematic diagram of a satellite communication system in a regeneration scenario provided by an embodiment of the present application.
  • Figure 3a is a schematic diagram of an SSB pattern provided by an embodiment of the present application.
  • Figure 3b is a schematic diagram of the search space of an SI message corresponding to an SSB provided by an embodiment of the present application;
  • Figure 3c is a schematic diagram of the search space of an SI message corresponding to an SSB provided by an embodiment of the present application;
  • Figure 4 is a schematic flow chart of a satellite communication method provided by an embodiment of the present application.
  • Figure 5a is a schematic diagram of a sub-window division method provided by an embodiment of the present application.
  • Figure 5b is a schematic diagram of a sub-window division method provided by an embodiment of the present application.
  • Figure 6a is a schematic diagram of a sub-window division method provided by an embodiment of the present application.
  • Figure 6b is a schematic diagram of a sub-window division method provided by an embodiment of the present application.
  • Figure 6c is a schematic diagram of a sub-window division method provided by an embodiment of the present application.
  • Figure 6d is a schematic diagram of a sub-window division method provided by an embodiment of the present application.
  • Figure 7 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • Figure 8 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • Figure 9 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application.
  • the appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.
  • At least one (item) means one or more
  • plural means two or more
  • at least two (items) means two or three and three
  • “and/or” is used to describe the relationship between associated objects, indicating that there can be three relationships.
  • a and/or B can mean: only A exists, only B exists, and A and B exist simultaneously. In this case, A and B can be singular or plural.
  • “Or” means that there can be two relationships, such as only A and only B; when A and B are not mutually exclusive, it can also mean that there are three relationships, such as only A, only B, or both A and B. .
  • the character "/" generally indicates that the related objects are in an "or” relationship.
  • At least one of the following or similar expressions refers to any combination of these items.
  • at least one of a, b or c can mean: a, b, c, "a and b", “a and c", “b and c", or "a and b and c" ".
  • the methods provided by the embodiments of the present application can be applied to non-terrestrial networks (NTN) communication systems, as shown in Figure 1.
  • the communication system can include terminal equipment, satellites (also called satellite base stations) and ground stations. (Also known as the gateway station, Xinguan station) (gateway). It can be understood that FIG. 1 only shows one satellite and one ground station. In actual use, a multi-satellite and/or multi-ground station architecture may be adopted as needed.
  • Each satellite can provide services to one or more terminal devices, each satellite can correspond to one or more ground stations, each ground station can correspond to one or more satellites, etc., which are not used in the embodiments of this application. be specifically limited.
  • the terminal device in the embodiment of the present application is a device with wireless transceiver function.
  • the terminal device can communicate with the access network device (or can also be called the access device) in the radio access network (radio access network, RAN).
  • Terminal equipment can also be called user equipment (UE), access terminal, terminal, subscriber unit, user station, mobile station, remote station, remote terminal, mobile device, user terminal, user Agent or user device, etc.
  • the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on water (such as a ship, etc.).
  • the terminal device may be a handheld device with wireless communication function, a vehicle-mounted device, a wearable device, a sensor, a terminal in the Internet of Things, a terminal in the Internet of Vehicles, a drone, a fifth-generation ( 5th generation (5G) network and any form of terminal equipment in future networks, etc.
  • 5G fifth-generation
  • the satellite communication method provided by the embodiment of the present application will be described below using a UE as an example.
  • the terminal devices shown in the embodiments of this application can also communicate through device-to-device (D2D), machine-to-machine (M2M), etc.
  • the terminal device shown in the embodiment of this application may also be a device in the Internet of Things (IoT).
  • the IoT network may include, for example, the Internet of Vehicles.
  • vehicle to X vehicle to X
  • V2X vehicle to X
  • X can represent anything).
  • the V2X can include: vehicle to vehicle (vehicle to vehicle, V2V) communication.
  • Infrastructure vehicle to infrastructure, V2I) communication, communication between vehicles and pedestrians (vehicle to pedestrian, V2P) or vehicle and network (vehicle to network, V2N) communication, etc.
  • the ground station in the embodiment of the present application can be used to connect satellites and base stations, or satellites and core networks.
  • the satellite in the embodiment of the present application can provide wireless access services for terminal devices, dispatch wireless resources to the accessed terminal devices, and provide reliable wireless transmission protocols and data encryption protocols, etc.
  • Satellites may be artificial earth satellites, high-altitude aircraft, etc. used as base stations for wireless communications, such as evolutionary base stations (evolutional NodeB, eNB) and next generation node B (next generation node B, gNB).
  • satellites can also serve as relays for these base stations, transparently transmitting signals from these base stations to terminal devices.
  • the network device may be the base station shown in Figure 1 (which may also be called a ground base station).
  • Figure 2a is a schematic diagram of a satellite communication system in a transparent transmission scenario provided by an embodiment of the present application.
  • the terminal device can access the network through an air interface (the air interface can be various types of air interfaces, such as 5G air interface, etc.), and the network equipment can be deployed on a ground base station.
  • Satellites are connected to ground stations via wireless links.
  • Ground stations and ground base stations are connected to the core network through wired or wireless connections. Wireless links can exist between satellites.
  • satellites can have transparent transmission and forwarding functions (that is, corresponding network equipment is deployed on the ground), and satellites can transparently transmit and forward.
  • the network device may be the satellite shown in Figure 1 .
  • Figure 2b is a schematic diagram of a satellite communication system in a regeneration scenario provided by an embodiment of the present application.
  • terminal equipment can access the network through an air interface (the air interface can be various types of air interfaces, such as 5G air interface, etc.), and network equipment can be deployed on satellites (such as satellite regeneration mode), such as base stations or part of base station functions. Deployed on satellites, signaling interactions and user data transmission between base stations can be completed between satellites, as shown in Figure 2c.
  • each network element in Figure 2a to Figure 2c and their interfaces can be as follows:
  • Terminal equipment can access the satellite network through the air interface and initiate calls, Internet access and other services.
  • Base stations can be used to provide wireless access services, schedule wireless resources to access terminal devices, and provide reliable wireless transmission protocols and data encryption protocols.
  • Ground stations can be used to forward signaling and business data between satellites and core networks.
  • the core network can be used for user access control, mobility management, session management, user security authentication or accounting, etc.
  • the core network can be composed of multiple functional units, such as functional entities including the control plane and data plane.
  • the core network shown in Figures 2a to 2c may include access mobility management function (access and mobility management function, AMF), session management function (session management function, SMF) and user plane function (user plane function, UPF) etc.
  • AMF can be used to be responsible for user access management, security authentication, and mobility management.
  • UPF can be used to manage the transmission of user plane data, traffic statistics, etc.
  • the air interface shown in Figure 2a to Figure 2c can be understood as the wireless link between the terminal and the base station, or the wireless link between the satellite and the ground station;
  • the Xn interface can be understood as the interface between the base station and the base station, and is mainly used for Handover and other signaling interactions;
  • the NG interface can be used as an interface between the base station and the core network to exchange non-access stratum (NAS) and other signaling of the core network, as well as user business data.
  • NAS non-access stratum
  • the satellite can be a geostationary earth orbit (GEO) satellite, a non-geostationary earth orbit (NGEO) medium earth orbit (MEO) satellite, or a low earth orbit (low earth orbit) , LEO) satellite, it can also be a high altitude communication platform (high altitude platform station, HAPS), etc.
  • GEO geostationary earth orbit
  • NGEO non-geostationary earth orbit
  • MEO medium earth orbit
  • LEO low earth orbit
  • HAPS high altitude platform station
  • the network equipment needs to send ephemeris information while issuing system information blocks (SIB) 1
  • SIB system information blocks
  • the UE needs to first correctly decode the synchronization signal block (SSB), and then decode SIB1 based on the relevant information in the SSB.
  • the network device can tell the UE through SIB1 which SI messages there are, which SIBs each SI message contains, in which SI window these SI messages will be sent, and the time domain position and length of the SI window, etc., but it will not tell the UE the location and length of the SI window. In which subframes the SI message is scheduled. Therefore, when the UE needs a certain SIB, the UE will try to decode at every monitoring occasion (MO) within the SI window corresponding to the SI message corresponding to the SIB until the SI message is successfully received to obtain the SI.
  • the SIB corresponding to the message when the UE needs a certain SIB, the UE will try to decode at every monitoring occasion (MO) within the SI window corresponding to the SI message corresponding to the SIB until the SI message is successfully received to obtain the SI.
  • the SIB corresponding to the message when the
  • the MO shown in the embodiments of this application can be called detection timing, blind detection timing, MO of PDCCH or MO of PDCCH based on SI-RNTI scrambling, etc.
  • detection timing For the specific description of this MO, please refer to the relevant protocols.
  • This application The examples will not be described in detail.
  • the detection shown in the embodiments of the present application may also be called blind detection. As shown below, the detection and blind detection may be replaced with each other.
  • the window length of the SI window shown in the embodiment of the present application may also be called the length of the SI window or simply the SI window length.
  • Figure 3a is a schematic diagram of an SSB pattern provided by an embodiment of the present application.
  • the network device can send 8 SSBs, such as SSB#0 to SSB#7.
  • Figure 3a only illustrates the time slots occupied by SSB#6 and SSB#7, and the time slots occupied by other SSBs are not shown one by one.
  • SIB1 and SIBx corresponding to the SSB are sent alternately in the last 8ms of an even-indexed SN.
  • SIB1 and SIBx corresponding to the SSB can effectively ensure that the UE can obtain the ephemeris information as soon as possible after receiving SIB1 to complete the uplink synchronization process.
  • the network device can be used to send downlink messages, such as SIB1, other system information (OSI), paging (paging) messages, random access responses (random At least one of access response (RAR) and message 4 (message4, Msg4).
  • SIBx may include SIB19, SIB2, etc., which is not limited in the embodiment of the present application.
  • the satellite communication method provided by the embodiment of the present application will be described below by taking the example of including ephemeris information in SIB19.
  • the even-indexed SF and the odd-indexed SF involved in the method shown in the embodiment of the present application are all illustrated by taking the index of the first SF in the SI window as 0 as an example. If the index of the first SF in the SI window is 1, the even-indexed SF shown in the embodiment of the present application can be replaced by an odd-indexed SF, and the odd-indexed SF can be replaced by an even-indexed SF.
  • a system frame can include 40 time slots.
  • the first 4 time slots of these 40 time slots can correspond to 8 SSBs, and the remaining time slots of these 40 time slots can Can be used to send SIB1 and SIB19 alternately, etc.
  • the following description takes the subcarrier interval as 30KHz as an example.
  • the SSB pattern may also have other forms, such as the first 2 time slots in a system frame corresponding to 4 SSBs. , the remaining time slots in this system frame can be used to alternately send SIB1 and SIB19, etc.
  • the embodiment of this application does not limit the uniqueness.
  • SIBx search space search space, SS
  • the 5G NR has two search spaces: UE-specific search space and public search space.
  • the UE-specific search space is dedicated to a certain UE (may be different for each UE) and is configured through radio resource control (RRC) messages. Only after the UE establishes an RRC connection can the relevant information of the UE-specific search space be obtained.
  • the common search space is a search space that each UE must blindly detect (such as the PDCCH of a certain SIB), or the signaling that is applicable to each UE before establishing a dedicated connection (such as the PDCCH corresponding to RACH). For example, during the random access process, the UE needs to detect the PDCCH used to receive SIB1 and some other PDCCH (DCI) (such as the DCI information of Msg2/Msg4).
  • DCI PDCCH
  • ephemeris information can be included in SIB19, that is, the UE needs to detect the PDCCH of SIB19 to obtain ephemeris information.
  • j represents the MO of PDCCH obtained by the UE
  • x 0,1,...,X-1
  • X ceil (the total number of MO of PDCCH in the SI window/N)
  • N represents the total number of SSBs in the SI window Quantity
  • K represents the index of the SSB received by the UE.
  • the UE can learn the total number of MOs of the PDCCH in the SI window and the total number of SSBs in the SI window from SIB1. And the UE can obtain the index of the SSB based on the SSB it received.
  • the MOs of the PDCCH of SIBx corresponding to SSB#8 obtained by the UE according to formula (1) are MO#8, MO#24, MO#40, MO#56, and MO#72 in order.
  • Figure 3b is a schematic diagram of a search space for an SI message corresponding to an SSB provided by an embodiment of the present application.
  • the system frame numbers (SFN) 1, SFN3, SFN5 and SFN7 shown in Figure 3b can be understood as the network device sending at least one of the following on these SFNs: OSI, paging message, RAR, and Msg4. That is to say, the network device can send at least one of OSI, paging message, RAR, and Msg4 through the blank frame shown in Figure 3b.
  • OSI OSI
  • paging message paging message
  • RAR paging message
  • Msg4 Msg4 through the blank frame shown in Figure 3b.
  • the satellite communication method provided by the embodiment of the present application can also be applied to the case where every three system frames include two blank frames, etc., which will not be repeated here. List them one by one.
  • the UE will blindly detect the SIBx corresponding to SSB#0 on MO#0, MO#16, MO#32, MO#48, and MO#64 within the SI window.
  • the SIBx corresponding to SSB#0 The sending position of SIBx is slot #5 in the SI window (MO#5 in Figure 3b), which causes the MO of the PDCCH of SIBx obtained by the UE to not match the SSB pattern.
  • the UE will blindly detect the SIBx corresponding to SSB#8 on MO#8, MO#24, MO#40, MO#56, and MO#72 within the SI window.
  • the network device is sending in SFN2 SSB#8, as well as MO#8 and MO#24 are located in SFN0 and SFN1 respectively, resulting in the UE being unable to detect the SIBx corresponding to SSB#8 on MO#8 and MO#24.
  • the sending position of SIBx corresponding to SSB#8 is MO#45 in SFN2, causing the UE to obtain The MO of the PDCCH of the obtained SIBx does not match the SSB pttern.
  • the MO of the PDCCH of SIBx does not match the SSB pattern, which will not only lead to a waste of blind detection resources, but also cause the UE to be completely unable to blindly detect the SIBx, thus increasing the initial access delay of the UE. .
  • an SI window includes multiple sub-windows, and each sub-window can correspond to an SI message, thereby effectively improving the detection efficiency and reducing the initial access time of the UE on the basis that the UE can detect the SI message. extension.
  • the MO in the sub-window corresponding to SIB19 all corresponds to the position where the network device actually sends SIB19, it can also effectively save blind detection resources and reduce the UE's Initial access delay.
  • the network device can indicate the SI window length through the SI window length (si-WindowLength) field in the system information block type 1 (SystemInformationBlockType1) in SIB1.
  • the scheduling information list (schedulingInfoList) in system information block type 1 can be used to indicate a list of SI messages, and the order of SI messages in the list can be represented by n (starting from 1). For example, assuming that 4 SI messages are specified in the scheduling information list, there will be 4 consecutive SI windows for sending these 4 SI messages, and n indicates which SI window the SI message is in.
  • the UE can only blindly detect SI messages within the corresponding SI window.
  • Figure 3c is a schematic diagram of the search space of an SI message corresponding to an SSB provided by an embodiment of the present application.
  • N 256
  • SSB period 640ms
  • SI window length 320ms
  • number of PDCCH MOs in the SI window 640
  • MO#0 ⁇ MO#255 of the first SI window correspond to SSB #0 ⁇ SSB#255
  • SSB#128 ⁇ SSB#255 have not been sent yet. 2.
  • MO#0 ⁇ MO#255 of the second SI window still correspond to SSB#0 ⁇ SSB#255, which is a serious waste of blind detection resources.
  • SSB#0 ⁇ SSB#255 which is a serious waste of blind detection resources.
  • this SI message will contain all SIB types, and the configuration is not flexible enough.
  • the window length of the SI window may be the same as the SSB period.
  • an SI window includes multiple sub-windows, and each sub-window can correspond to an SI message, so that an SI window can include multiple SI messages.
  • the multiple SI messages can correspond to different types.
  • SIB improves configuration flexibility.
  • the UE can blindly detect the corresponding SI message, which effectively ensures that the SIB19 corresponding to each SSB can be blindly detected by the UE during the initial access process, improving the detection efficiency of the UE.
  • Embodiments of the present application provide a satellite communication method and device, which can effectively solve the problem of the above-mentioned mismatch between the MO and SSB pattern of the PDCCH of SIB19.
  • an SI window may include multiple sub-windows, and each sub-window may correspond to an SI message. Therefore, the sub-window corresponding to each SI message is smaller than the SI window, which can effectively improve detection efficiency.
  • the UE can blindly detect multiple SI messages within an SI window, which can make the blind detection of SI messages more flexible and reduce the number of blind detections of SIB19 by the UE as much as possible.
  • Figure 4 is a schematic flowchart of a satellite communication method provided by an embodiment of the present application. This method can be applied to the communication system shown in Figure 1, or the communication system shown in Figures 2a to 2c. As shown in Figure 4, the method includes:
  • the network device sends a broadcast message.
  • the UE receives the broadcast message.
  • the broadcast message includes indication information.
  • the indication information is used to indicate that an SI window includes Nw sub-windows. Each sub-window corresponds to an SI message and Nw SIs. At least one SI message in the message includes ephemeris information.
  • Nw is an integer greater than or equal to 2.
  • the broadcast message may include SIB1.
  • the indication information may be included in the information configuration (configcommon) field in SIB1.
  • the sub-window shown in the embodiment of the present application can be understood as a virtual window or an SI sub-window, etc.
  • the embodiment of the present application does not limit the specific name of the sub-window.
  • the period of the SI window (SI-periodicity) may be any of the following: ⁇ 80,160,320,640,1280,2560,5120 ⁇ ms.
  • the window length (SI-windowlength) of the SI window can be any of the following: ⁇ 5,10,20,40,80,160,320,640,1280 ⁇ slots.
  • the length of the SI window may be equal to the period of the SI window.
  • At least one SI message among the Nw SI messages includes ephemeris information, which can be understood as: at least one SI message among the Nw SI messages corresponds to SIB19 (that is, the UE can detect SIB19 from at least one SI message), and in the SIB19 Can include ephemeris information.
  • the ephemeris information shown in the embodiment of the present application is only an example, and all information that the UE needs to obtain from the SIB falls within the protection scope of the embodiment of the present application.
  • at least one SI message among the Nw SI messages corresponds to SIB2 (or SIB4), and the SIB2 (or SIB4) may include cell switching information. Therefore, when the UE needs to perform cell switching, it can switch from at least one sub-window in the Nw sub-windows. Detect the SI message corresponding to SIB2 to obtain cell switching information.
  • the indication information may be used to indicate Nw, and the indication information may be used to indicate the number of multiple sub-windows divided into one SI window.
  • the indication information may include Nw.
  • the network device may indicate Nw in the form of an index, or may indicate Nw in the form of a bitmap, which is not limited in this embodiment of the present application. The implementation method when Nw is included in the instruction information is simple to implement.
  • the reference value can be set by the network device, such as configured to the terminal device through an RRC message.
  • the reference value can be defined by the protocol, etc., and will not be listed one by one.
  • the broadcast message also includes at least one of the following information: the time-frequency resource of the SI window, the index of the SI message corresponding to each sub-window, and the SIB corresponding to each SI message.
  • the SIBs shown here can be understood as SIBs other than SIB1.
  • each sub-window may include one or more SIBs other than SIB1 with the same scheduling period. That is, the SIBs included in each sub-window have the same scheduling. cycle.
  • the terminal device can learn the Nw sub-windows on the corresponding time-frequency resources.
  • the terminal device can learn which SI messages each sub-window contains.
  • the terminal device can learn which SIBs each SI message corresponds to, thereby more accurately learning which SI message SIB19 is in, and thus learning the ephemeris information.
  • the broadcast message may also include the SS arrangement, and the SS arrangement may be used to indicate the number of time slots corresponding to one MO.
  • the broadcast message includes at least one of the following information: the period of the MO and the offset of the MO.
  • the period of the MO is used to indicate the starting position of the MO relative to an SF. Taking Figure 5a as an example, the period of the MO can be that each time slot corresponds to one MO, and the offset of the MO can be 0.
  • the period of the MO may be that every two time slots correspond to one MO, and the offset of the MO may be 0.5 ms.
  • the UE can effectively learn the number of time slots corresponding to an MO. For example, every two time slots can correspond to one MO, or each time slot can correspond to one MO, etc., which will not be listed here.
  • an SI message can be associated with a sub-window, for example, a corresponding SI message can be sent in each sub-window (which can be repeated multiple times).
  • the periods of different sub-windows may be independent of each other, and different sub-windows may not overlap each other.
  • the number of times SI messages are sent within a sub-window or the time slots on which SI messages are sent may depend on the implementation of the network device.
  • the UE wants to obtain other SIBs, it can also detect the corresponding SI message in the sub-window corresponding to the SIB.
  • the SIB19 shown in the embodiment of this application is only an example and should not be understood as a limitation of the embodiment of this application. .
  • the MOs in each sub-window of Nw sub-windows correspond to a set of MOs in each M SFs in the SI window, where M is an integer greater than or equal to 2.
  • each M SF may include Nw groups of MOs, and one group of MOs in the Nw groups of MOs may correspond to a sub-window, that is, each group of MOs in the Nw groups of MOs corresponds to different sub-windows.
  • MOs are grouped the same way per M SFs. Since each M SF groups MOs in the same manner, for the convenience of description, the grouping manner of M SFs will be used as an example in the following description, and the grouping manner of other SFs can be deduced by analogy.
  • Each M SF includes a first group of MOs, and the first group of MOs can satisfy at least one of the following: the MOs in the first group of MOs can correspond to the same SF; or, the MOs in the first group of MOs can correspond to at least two SF.
  • the first group of MO shown here is only a general description and does not have a specific meaning.
  • the first group of MOs may include MOs corresponding to SIB19 in SFs indexed by even numbers (for example, it may include all or part of them).
  • the first group of MOs may also include MOs corresponding to SIB19 in SFs indexed by odd numbers.
  • the first group of MOs does not include MOs occupied by SSB.
  • the embodiment of the present application does not limit how other groups of MOs other than the first group of MOs are divided.
  • one SI window can be divided into two sub-windows.
  • one sub-window can be composed of the MOs corresponding to SIB19 in the even-indexed SF
  • the other sub-window can be composed of the remaining MOs in the even-indexed SF.
  • the remaining MOs can be understood as MOs in an even-indexed SF that do not correspond to SIB19.
  • one sub-window can be composed of MOs corresponding to SIB19 in the even-indexed SF
  • the other sub-window can be composed of other MOs that are not corresponding to SIB19, such as Includes remaining MOs in even-indexed SFs as well as MOs in odd-indexed SFs.
  • these three sub-windows may include: a sub-window consisting of the MO corresponding to SIB19 in the even-indexed SF, and the remaining MOs in the even-indexed SF (referring to MOs other than the MO corresponding to SIB19) A subwindow consisting of MOs in odd-indexed SFs.
  • the division method of other sub-windows except the sub-window corresponding to SIB19 is only an example.
  • the sub-windows can also be divided based on other SIBs that the UE wants to obtain. For example, when the UE switches between cells, it needs to obtain SIB2 and SIB4.
  • the three sub-windows can also include: a sub-window composed of the MO corresponding to SIB19 in the even-indexed SF, a sub-window composed of the MO corresponding to SIB2 A sub-window composed of a sub-window and the MO corresponding to SIB4.
  • the embodiment of this application does not limit the specific sub-window division method.
  • the sub-window consisting of the MO corresponding to SIB19 in the even-indexed SF shown in the embodiment of this application may not include SSB occupation. of MO.
  • the sub-windows shown in the embodiments of this application may not include MOs occupied by SSB.
  • Nw is determined based on the total number of MOs based on SI-RNTI scrambled PDCCH in the SI window and the total number of SSBs in the SI window.
  • Nw is related to the total number of MOs based on SI-RNTI scrambled PDCCH in the SI window and the total number of SSBs in the SI window.
  • the number of MOs that the UE may blindly detect SIB19 in an SI window can be determined based on the total number of PDCCH MOs in the SI window and the total number of SSBs in the SI window.
  • S MO represents the total number of MOs based on SI-RNTI scrambled PDCCH in the SI window
  • N represents the total number of SSBs in the SI window.
  • the number of Nw may also be greater than the above Nmax, or less than or equal to Nmax.
  • the specific value of Nw can be determined by the network device, and the embodiment of the present application does not limit the specific value of Nw.
  • the method shown in Figure 4 also includes:
  • the network device sends the SSB, and correspondingly, the UE receives the SSB.
  • x 0,1,...,X-1, The total number of SSBs within.
  • the period of the SSB is equal to the window length of the SI window.
  • the total number of available PDCCH MOs in the SI window S MO 80
  • FIG. 5a is a schematic diagram of a sub-window division method provided by an embodiment of the present application.
  • the two sub-windows include the same number of MOs.
  • the two sub-windows are sub-window 1 and sub-window 2 respectively.
  • Sub-window 1 and sub-window 2 both include 16 MOs.
  • sub-window 1 may correspond to an odd-index MO in an even-index SF in the SI window
  • sub-window 2 may correspond to an even-index MO in an even-index SF in the SI window.
  • Figure 5a neither sub-window 1 nor sub-window 2 includes MO occupied by SSB.
  • the corresponding relationship between the MO in sub-window 1 and the MO in the SI window can be shown in Figure 5a
  • the corresponding relationship between the MO in sub-window 2 and the MO in the SI window can be shown in Figure 5a.
  • FIG. 5a only exemplarily shows the case where sub-window 1 and sub-window 2 correspond to one SF, and the case of corresponding to other SFs can be deduced in the same way.
  • MO#0 in sub-window 1 is equivalent to MO#5 in SFN0 in the SI window
  • MO#8 in sub-window 1 is equivalent to MO#45 in SFN2 in the SI window
  • MO#0 in subwindow 2 It is equivalent to MO#4 in SFN0 in the SI window
  • MO#8 in sub-window 2 is equivalent to MO#44 in SFN2 in the SI window.
  • the sending position of SIB19 corresponding to SSB#0 is slot#5 within the SI window (MO#5 in Figure 5a).
  • the network device is sending SSB#8 in SFN2. It can be seen from the method shown in Figure 3b that there will be a problem in Figure 3b that the MO obtained by the UE for detecting SIB19 does not match the sending position of the network device. However, through the method provided by the embodiment of the present application, when the UE detects the SI message on sub-window MO#0, it can obtain the SIB19 corresponding to the SI message, thereby obtaining the ephemeris information.
  • the UE can detect SIB19 on the MO within sub-window 1, which not only effectively reduces the blind detection resources used by the UE when blindly detecting SIB19, but also ensures that the UE can blindly detect SIB19.
  • FIG. 5b is a schematic diagram of a sub-window division method provided by an embodiment of the present application.
  • the two sub-windows include different numbers of MOs.
  • the two sub-windows are sub-window 1 and sub-window 2 respectively.
  • Sub-window 1 includes 16 MOs
  • sub-window 2 includes 48 MOs.
  • sub-window 1 may correspond to an odd-indexed MO in an even-indexed SF in the SI window, and does not include the MO occupied by the SSB.
  • Sub-window 2 may correspond to the remaining MOs in the SI window except the MO corresponding to sub-window 1 (as shown in Figure 5b); alternatively, sub-window 2 may correspond to even-indexed MOs in the even-indexed SF in the SI window and SF for odd indexes in the SI window. Subwindow 2 does not include MO occupied by SSB. The embodiment of this application does not limit the specific manner of MO included in sub-window 2. The corresponding relationship between the MO in sub-window 1 and the MO in the SI window can be shown in Figure 5b.
  • the MO index i 0, 16, and 32 in sub-window 1 corresponding to SSB#0. That is, the UE can blindly detect the SI message corresponding to sub-window 2 at MO#0, MO#16, and MO#32 in sub-window 2.
  • each M SFN includes Nw groups of MOs.
  • the network device can indicate the specific sub-window division method of the UE through a broadcast message.
  • the indication information may include Nw and the division method of the sub-window corresponding to Nw.
  • the division method of the sub-window corresponding to Nw can be indicated in the form of an index.
  • the indication information may include Nw and index 1 (or index 0).
  • the sub-window division method corresponding to Nw can be indicated in the form of a bitmap.
  • bitmap 0001
  • Nw 3
  • the first sub-window division method can be used.
  • the sub-window division method shown here is indicated by an index or a bitmap, and it can be understood that the UE has obtained the sub-window division method under different Nw in advance.
  • each sub-window division method can also be set with an index, so that when Nw is fixed, the network device can indicate the index of each sub-window division method to the UE, so that the UE can learn the specific sub-window division method. .
  • the UE may not obtain the division method of sub-windows under different Nw in advance, and the network device may indicate the specific division method to the UE in a broadcast message.
  • the broadcast message may include a division method of at least one sub-window.
  • the broadcast message may also include at least one of the following: the offset of each group of MOs in each M SF relative to the starting position of each M SF, the window length of each group of MOs in each M SF, the Value (can also be understood as the period of each group of MO).
  • the broadcast message may include 2 (that is, the SI window is divided into 2 sub-windows), and the offset of sub-window 1 relative to the starting position of each 2 SF, which is 5 MO (or 2.5 ms ), the offset of sub-window 2 relative to the starting position of every 2 SF is 4 MO (or 2ms), the window length of sub-window 1 in every M SF is 16 MO (or 8ms), every M The window length of sub-window 2 in one SF is 16 MOs (or 8ms), and the period of each group of MOs is 2 SFs.
  • the number of the two sub-windows shown above may not be explicitly included in the broadcast message, but the number of sub-windows may be indicated by the offset or the number of different values of the window length.
  • the MOs in sub-window 1 and sub-window 2 come from even-indexed SFs, and the 16 MOs in sub-window 1 correspond to the odd indexes of SFN0 and SFN2 respectively. of MO, The 16 MOs in sub-window 2 correspond to the even-indexed MOs of SFN1 and SFN2 respectively.
  • the broadcast message may include 2 (that is, the SI window is divided into 2 sub-windows) and the offset of sub-window 1 relative to the starting position of each 2 SF, which is 5 MO (or 2.5 ms), the window length of sub-window 1 in each M SF is 16 MOs (or 8ms), and the period of each group of MOs is 2 SFs.
  • the division method of sub-window 2 can be determined independently by the UE.
  • the division method of sub-window 2 may be included in the broadcast message.
  • the broadcast message may include: 2.
  • FIG. 5b takes the first four MOs in the SF whose sub-window 2 does not include odd indexes as an example, but this should not be understood as limiting the embodiment of the present application.
  • sub-window 2 may include the first four MOs in the odd-indexed SF (the first four time slots can also be understood).
  • each group of MOs shown in the embodiments of the present application may also be called a burst window or a burst window, etc.
  • the embodiments of the present application do not limit the name of each group of MOs.
  • the sub-window division method shown in the embodiment of this application is applicable to the network device side and also to the terminal device side.
  • the network device may determine an SI window, and the SI window includes Nw sub-windows.
  • the way to determine the Nw sub-windows included in an SI window can refer to the sub-window division method shown in the embodiment of this application.
  • the sub-windows included in an SI window can be determined based on the SSB pattern and the transmission situation of SIB19.
  • the number of Nw sub-windows is determined to be included in an SI window.
  • the terminal device detects Nw SI messages based on the broadcast message.
  • each S message I can correspond to a SIB, such as SIB2, SIB3, and SIB19, which will not be listed one by one here.
  • the UE After detecting the SI message in the corresponding sub-window, the UE can obtain SIB19 based on the SI message in the corresponding sub-window, thereby obtaining the ephemeris information included in SIB19. Alternatively, the UE can obtain SIB2 based on the SI message in the corresponding sub-window, thereby obtaining the cell switching information included in SIB2, etc., which will not be listed here.
  • an SI window is divided into Nw sub-windows, and each sub-window corresponds to an SI message. Therefore, the terminal device can obtain SIB19 in at least one SI.
  • the length of the sub-window corresponding to the SI message is smaller than the SI. window, so it can effectively improve the detection efficiency of terminal equipment and improve the efficiency of detecting SIB19.
  • each sub-window corresponds to an SI message, so that one SI window can include multiple SI messages.
  • the multiple SI messages can correspond to different types of SIBs, which improves the flexibility of configuration.
  • S MO 640
  • N 256
  • Nw 2 (example only)
  • the indexes of the SI messages corresponding to the sub-window are 2 and 4 in order.
  • the MO in sub-window 1 corresponds to the MO in the even-indexed SF within the SI window length, excluding the MO occupied by the SSB (it can also be understood as the MO corresponding to the time slot occupied by the SSB), and the
  • the indexes of MOs in sub-window 1 are arranged in order from small to large (it can also be understood that the indexes of MOs in sub-window 1 are renumbered based on the order of small size).
  • the MO within sub-window 2 may correspond to the MO within the odd-indexed SF within the SI window length, excluding the MO corresponding to the first four time slots within the odd-indexed SF, and the index of the MO within sub-window 2 is They are arranged in order from small to large (it can also be understood that the index of the MO in sub-window 2 is renumbered based on the order of small size).
  • sub-window 2 may also include MOs corresponding to the first four time slots in the odd-indexed SF.
  • the actual location where the network device sends SIB19 is at MO#2.
  • the actual location where the network device sends SIB19 is at MO#22.
  • the actual location where the network device sends SIB19 is MO#639.
  • the MO indexes of the PDCCH of SIB19 corresponding to SSB#0 are: MO#0, MO#256, and MO#512.
  • the MO indexes of the PDCCH of SIB19 corresponding to SSB#8 are: MO#8, MO#264, and MO#520.
  • the MO indexes of the PDCCH of SIB19 corresponding to SSB#255 are: MO#255, MO#511. That is, the UE needs to obtain SIB19 from the above MO according to the index of the SSB it received. It can be seen from formula (1) that when the UE receives SSB#0, it cannot detect SIB19 on MO#0, MO#256, and MO#512.
  • the SI window is divided into two sub-windows, sub-window 1 and sub-window 2, then each sub-window can include 256 MOs.
  • the PDCCH of SIB19 corresponding to SSB#0 The index of the MO is MO#0.
  • MO#0 in sub-window 1 is equivalent to MO#2 in the SI window, that is, MO#0 in sub-window 1 is included in the actual position where the network device sends SIB19.
  • the index of the MO of the PDCCH of SIB19 corresponding to SSB#8 is MO#8.
  • MO#8 in sub-window 1 is equivalent to MO#22 in the SI window, that is, MO#8 in sub-window 1 is included in the network device sending SIB19 in the actual location.
  • the index of the MO of the PDCCH of SIB19 corresponding to SSB#255 is MO#255.
  • MO#255 in sub-window 1 is equivalent to MO#629 in the SI window.
  • MO#255 in sub-window 1 is included in the SIB19 sent by the network device. in actual location.
  • the UE can blindly detect the SIB (eg, it may be SIB2 or SIB4, etc.) included in the SI message (eg, SI4 message) corresponding to sub-window 2 from sub-window 2.
  • the method provided by the embodiments of this application not only ensures that the UE can blindly detect SIB19 on the corresponding MO after obtaining the SSB, but also achieves the purpose of saving blind detection resources as much as possible.
  • the broadcast message may include at least one of the following: the value of M; each group of MOs in each two SFs relative to each two SFs. The offset of the starting position, such as 2.5ms and 2ms in sequence; the window length of each group of MOs in each M SF, such as 8ms and 8ms in sequence; the time-frequency resources of the SI window; the SI message corresponding to each sub-window The index; the SIB corresponding to each SI message.
  • the broadcast message may include at least one of the following: the SI window includes 2 sub-windows, the index of the division method of the two sub-windows, the SI window The time-frequency resources, the index of the SI message corresponding to each sub-window, and the SIB corresponding to each SI message.
  • FIG. 6a takes the SI window length equal to 640 ms as an example.
  • the relevant description shown in FIG. 6a can also be applied to the SI window length equal to 320 ms.
  • the indexes of the SI messages corresponding to the sub-window are 2 and 4 in order.
  • the MO within sub-window 1 corresponds to the MO within the even-indexed SFN within the SI window length, and does not include the MO occupied by SSB.
  • the MO within sub-window 2 may correspond to the MO within the odd-numbered SFN within the SI window length.
  • Sub-window 1 does not include MOs occupied by SSB, which allows the UE to conveniently and quickly obtain the index number of the MO that it can blindly detect SIB19 based on the above formula (3).
  • sub-window 2 may also include MOs corresponding to the first four time slots within the odd-indexed SF.
  • sub-window 2 may also include MOs occupied by SSBs.
  • the UE can detect SI2 messages in sub-window 1 and SI4 messages in sub-window 2, and detect different SI messages through different sub-windows, which improves the flexibility of configuration and is effective. Improved detection efficiency.
  • S MO 1280
  • N 512
  • Nw 2 (example only)
  • the indexes of the SI messages corresponding to the sub-window are 2 and 4 in order.
  • the MOs in sub-window 1 correspond to part of the MOs in the even-indexed SFs in the SI window, excluding the MOs occupied by SSB, and the indexes of the MOs in sub-window 1 are from small to small. arranged in order.
  • sub-window 1 can also be understood as: the MOs in sub-window 1 correspond to the first four MOs in the even-indexed SF in the SI window excluding the MOs occupied by SSBs.
  • the above partial MO can be understood as the first small window length in the even-indexed SF as shown in Figure 6c.
  • the MOs in sub-window 2 correspond to the partial MOs in the SF with odd indexes within the SI window length, and the indices of the MOs in sub-window 2 are arranged in order from small to large.
  • the MO within sub-window 2 can be understood as the first small window length within the odd-indexed SF (not shown in Figure 6c).
  • sub-window 2 can also be understood as: the MOs in sub-window 2 correspond to the first four MOs in the odd-indexed SF in the SI window except the MOs corresponding to the first two time slots.
  • FIG. 6c shows an example in which every two SNs include four SSBs, and the four SSBs respectively correspond to the third to tenth time slots in the even-indexed SF. If the four SSBs respectively correspond to the eleventh to eighteen time slots in the even-indexed SF, then the MO in sub-window 1 can correspond to the second small window length in the even-indexed SF, such as The second small window shown in Figure 6c is long.
  • the small window length shown in Figure 6c can be understood as a group of MOs.
  • the division method of sub-window 2 shown in Figure 6c is only an example and should not be understood as a limitation of the embodiment of the present application.
  • the index of the MO of the PDCCH of SIB19 corresponding to SSB#0 is MO#0.
  • MO#0 in sub-window 1 is equivalent to MO#1 in the SI window, and MO#0 in sub-window 1 is included in the actual position where the network device sends SIB19.
  • the index of the MO of the PDCCH of SIB19 corresponding to SSB#8 is MO#8.
  • MO#8 in sub-window 1 is equivalent to MO#41 in the SI window.
  • MO#8 in sub-window 1 is included in the SIB19 sent by the network device. in actual location.
  • the UE can blindly detect the SIB (eg, it may be SIB2 or SIB4, etc.) included in the SI message (eg, SI4 message) corresponding to sub-window 2 from sub-window 2.
  • the method provided by the embodiments of this application not only ensures that the UE can blindly detect SIB19 on the corresponding MO after obtaining the SSB, thereby improving the detection efficiency of the UE, but also achieves the purpose of saving blind detection resources as much as possible.
  • S MO 1280
  • N 256
  • Nw 2 (example only)
  • the indexes of the SI messages corresponding to the sub-window are 2 and 4 in order.
  • the MO in sub-window 1 corresponds to the odd-indexed MO in the even-indexed SF in the SI window, excluding the MO occupied by SSB, and the index of the MO in sub-window 1 is from small to large. arranged in order.
  • the MO within sub-window 2 corresponds to the odd-indexed MO within the odd-indexed SF within the SI window, excluding the MOs corresponding to the first four slots within the odd-indexed SF (example only).
  • the MO within sub-window 2 may correspond to the even-indexed MO within the odd-indexed SF within the SI window, excluding the MOs corresponding to the first four slots within the odd-indexed SF (example only).
  • the MO within sub-window 2 may correspond to the even-indexed MO within the even-indexed SF within the SI window, excluding MOs occupied by SSBs.
  • the MO within sub-window 2 may correspond to an even-indexed MO within an even-indexed SF within the SI window, and an even-indexed (or odd-indexed) MO within an odd-indexed SF within the SI window.
  • the MO within sub-window 2 may correspond to the MO within the even-indexed SF within the SI window, and the MO within the odd-indexed SF within the SI window.
  • the indexes of MOs in sub-window 1 and sub-window 2 are reordered from small to large.
  • the index of the MO of the PDCCH of SIB19 corresponding to SSB#0 is MO#0.
  • MO#0 in sub-window 1 is equivalent to MO#5 in the SI window, and MO#0 in sub-window 1 is included in the actual position where the network device sends SIB19.
  • the UE can efficiently detect SIB19 in the SI message (such as SI2 message) corresponding to sub-window 1, and detect SIB (such as SIB2) in the SI message (such as SI4 message) corresponding to sub-window 2 or SIB4, etc.). It can be understood that for the specific description of Figure 6d, reference can be made to the above, and no details will be given here.
  • blind detection of multiple SI messages can be implemented within one SI window.
  • the MO of the PDCCH of the SI can be more matched with the SSB pattern in the current NTN scenario, and the configuration method is also more flexible. It not only saves the blind detection resources of the UE when blindly detecting the SI message, but also obtains the ephemeris information in the SI message more accurately and efficiently. It also reduces the initial access time and improves the user experience.
  • This application divides the communication device into functional modules according to the above method embodiments.
  • each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module.
  • the above integrated modules can be implemented in the form of hardware or software function modules. It should be noted that the division of modules in this application is schematic and is only a logical function division. In actual implementation, there may be other division methods.
  • the communication device according to the embodiment of the present application will be described in detail below with reference to FIGS. 7 to 9 .
  • FIG 7 is a schematic structural diagram of a communication device provided by an embodiment of the present application. As shown in Figure 7, the communication device includes a processing unit 701 and a transceiver unit 702.
  • the communication device may be the UE or terminal equipment or chip shown above, and the chip may be provided in the terminal equipment or UE. That is, the communication device can be used to perform the steps or functions performed by the UE in the above method embodiments (including Figure 4).
  • the transceiver unit 702 is configured to receive a broadcast message.
  • the broadcast message includes indication information.
  • the indication information is used to indicate that an SI window includes Nw sub-windows.
  • Each sub-window in the Nw sub-windows corresponds to an SI message, Nw SI messages.
  • At least one SI message in includes ephemeris information, Nw is an integer greater than or equal to 2;
  • the processing unit 701 is configured to detect Nw SI messages based on the broadcast message.
  • the MO in each sub-window corresponds to a group of MOs in each M SFs in the SI window, where M is an integer greater than or equal to 2.
  • each M SF includes a first group of MOs, and the first group of MOs satisfies at least one of the following conditions: MOs in the first group of MOs correspond to the same SF; MOs in the first group of MOs correspond to At least two SF.
  • the first group of MOs includes MOs corresponding to SIB19 in SFs indexed by even numbers.
  • the MO index in each sub-window is determined by extracting a group of MOs from each M SFs in the SI window and then numbering them in ascending order.
  • the transceiver unit 702 is also used to receive SSB.
  • the index of SSB is K.
  • the period of the SSB is equal to the window length of the SI window.
  • the value of M is determined based on the SSB pattern.
  • the broadcast message also includes at least one of the following information: the time-frequency resource of the SI window, the index of the SI message corresponding to each sub-window in the Nw sub-window, and the system information block SIB corresponding to each SI message. .
  • transceiver unit and the processing unit shown above are only examples.
  • specific functions or steps performed by the transceiver unit and the processing unit reference can be made to the above method embodiments, which will not be described in detail here.
  • SI window, sub-window, Nw, M, and the first group of MOs please refer to the introduction in the above method embodiment, and will not be described in detail here.
  • the communication device may be the network device or chip shown above, and the chip may be disposed in the network device. That is, the communication device can be used to perform the steps or functions performed by the network device in the above method embodiments (including Figure 4).
  • the processing unit 701 is used to determine Nw sub-windows included in a system information SI window;
  • the transceiver unit 702 is configured to send a broadcast message.
  • the broadcast message includes indication information.
  • the indication information is used to indicate that an SI window includes Nw sub-windows. Each sub-window in the Nw sub-windows corresponds to an SI message. At least one of the Nw SI messages There is an SI message including ephemeris information, and Nw is an integer greater than or equal to 2.
  • the MO in each sub-window corresponds to a group of MOs in every M system frames SF in the SI window, where M is an integer greater than or equal to 2.
  • each M SF includes a first group of MOs, and the first group of MOs satisfies at least one of the following: the MOs in the first group of MOs come from the same SF; the MOs in the first group of MOs come from in at least two SFs.
  • the first group of MOs includes MOs corresponding to SIB19 in SFs indexed by even numbers.
  • the MO index in each sub-window is determined by extracting a group of MOs from each M SFs in the SI window and then numbering them in ascending order.
  • the transceiver unit 702 is also used to send the synchronization signal block SSB.
  • the period of the SSB is equal to the window length of the SI window.
  • the value of M is determined based on the SSB pattern.
  • the broadcast message also includes at least one of the following information: the time-frequency resource of the SI window, the index of the SI message corresponding to each sub-window in the Nw sub-window, and the system information block SIB corresponding to each SI message. .
  • Nw is determined based on the total number of MOs in the SI window and the total number of synchronization signal blocks SSB in the SI window.
  • Nw is less than or equal to Nmax, and Nmax satisfies the following conditions:
  • S MO represents the total number of MOs in the SI window
  • N represents the total number of synchronization signal blocks SSB in the SI window.
  • transceiver unit and the processing unit shown above are only examples.
  • specific functions or steps performed by the transceiver unit and the processing unit reference may be made to the above method embodiments, which will not be described in detail here.
  • SI window, sub-window, Nw, M, and the first group of MOs please refer to the introduction in the above method embodiment, and will not be described in detail here.
  • the communication device according to the embodiment of the present application has been introduced above. Possible product forms of the communication device are introduced below. It should be understood that any form of product that has the functions of the communication device described in FIG. 7 falls within the protection scope of the embodiments of the present application. It should also be understood that the following description is only an example, and does not limit the product form of the communication device in the embodiment of the present application to this.
  • the processing unit 701 may be one or more processors, the transceiving unit 702 may be a transceiver, or the transceiving unit 702 may also be a sending unit and a receiving unit.
  • the sending unit may be a transmitter
  • the receiving unit may be a receiver
  • the sending unit and the receiving unit are integrated into one device, such as a transceiver.
  • the processor and the transceiver may be coupled, etc., and the embodiment of the present application does not limit the connection method between the processor and the transceiver.
  • the process of sending information in the above method can be understood as the process of outputting the above information by the processor.
  • the processor When outputting the above information, the processor This above information is output to the transceiver for transmission by the transceiver. After the above information is output by the processor, it may also need to undergo other processing before reaching the transceiver. Similarly, the process of receiving information in the above method can be understood as the process of the processor receiving the input information.
  • the processor receives the incoming information
  • the transceiver receives the above information and inputs it into the processor. Furthermore, after the transceiver receives the above information, the above information may need to undergo other processing before being input to the processor.
  • the communication device 80 includes one or more processors 820 and a transceiver 810 .
  • the communication device may be used to perform steps or functions performed by the UE in the above method embodiments.
  • Transceiver 810 configured to receive a broadcast message.
  • the broadcast message includes indication information.
  • the indication information is used to indicate that an SI window includes Nw sub-windows.
  • Each sub-window in the Nw sub-windows corresponds to an SI message, Nw SI messages.
  • At least one SI message in includes ephemeris information, Nw is an integer greater than or equal to 2;
  • Processor 820 configured to detect Nw SI messages based on the broadcast message.
  • the processor 820 may be configured to receive the input broadcast message, thereby detecting Nw SI messages based on the broadcast message.
  • the transceiver 810 is also used to receive SSB.
  • the processor 820 may also be configured to receive the input SSB and detect Nw SI messages based on the SSB and the above broadcast message.
  • the communication device may be used to perform the steps or functions performed by the network device in the above method embodiments.
  • Processor 820 used to determine Nw sub-windows included in a system information SI window
  • the transceiver 810 is configured to send a broadcast message.
  • the broadcast message includes indication information.
  • the indication information is used to indicate that an SI window includes Nw sub-windows. Each sub-window in the Nw sub-windows corresponds to an SI message. At least one of the Nw SI messages There is an SI message including ephemeris information, and Nw is an integer greater than or equal to 2.
  • the processor 820 can also output a broadcast message so that the transceiver 810 can send the broadcast message.
  • the transceiver 810 is also used to send SSB.
  • the processor 820 can also output the SSB so that the transceiver 810 can send the SSB.
  • transceiver and processor shown in the embodiments of the present application are only examples.
  • transceiver and processor reference can be made to the above method embodiments, which will not be described in detail here.
  • the transceiver may include a receiver and a transmitter, the receiver is used to perform the function (or operation) of receiving, and the transmitter is used to perform the function (or operation) of transmitting. ). and transceivers for communication over transmission media and other equipment/devices.
  • the communication device 80 may also include one or more memories 830 for storing program instructions and/or data.
  • Memory 830 and processor 820 are coupled.
  • the coupling in the embodiment of this application is an indirect coupling or communication connection between devices, units or modules, which may be in electrical, mechanical or other forms, and is used for information interaction between devices, units or modules.
  • Processor 820 may cooperate with memory 830.
  • Processor 820 may execute program instructions stored in memory 830.
  • at least one of the above one or more memories may be included in the processor.
  • connection medium between the above-mentioned transceiver 810, processor 820 and memory 830 is not limited in the embodiment of the present application.
  • the memory 830, the processor 820 and the transceiver 810 are connected through a bus 840 in Figure 8.
  • the bus is represented by a thick line in Figure 8.
  • the connection methods between other components are only schematically explained. , is not limited.
  • the bus can be divided into address bus, data bus, control bus, etc. For ease of presentation, only one thick line is used in Figure 8, but it does not mean that there is only one bus or one type of bus.
  • the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., which can be implemented Or execute the disclosed methods, steps and logical block diagrams in the embodiments of this application.
  • a general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the methods disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware processor, or executed by a combination of hardware and software modules in the processor, etc.
  • the memory may include, but is not limited to, non-volatile memories such as hard disk drive (HDD) or solid-state drive (SSD), random access memory (Random Access Memory, RAM), Erasable Programmable ROM (EPROM), Read-Only Memory (ROM) or Portable Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) and so on.
  • Memory is any storage medium that can be used to carry or store program codes in the form of instructions or data structures, and that can be read and/or written by a computer (such as the communication device shown in this application), but is not limited thereto.
  • the memory in the embodiment of the present application can also be a circuit or any other device capable of realizing a storage function, used to store program instructions and/or data.
  • the processor 820 is mainly used to process communication protocols and communication data, control the entire communication device, execute software programs, and process data of the software programs.
  • Memory 830 is mainly used to store software programs and data.
  • the transceiver 810 may include a control circuit and an antenna.
  • the control circuit is mainly used for conversion of baseband signals and radio frequency signals and processing of radio frequency signals.
  • Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users.
  • the processor 820 can read the software program in the memory 830, interpret and execute the instructions of the software program, and process the data of the software program.
  • the processor 820 performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal out in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 820.
  • the processor 820 converts the baseband signal into data and performs processing on the data. deal with.
  • the radio frequency circuit and antenna can be arranged independently of the processor that performs baseband processing.
  • the radio frequency circuit and antenna can be arranged remotely and independently of the communication device. .
  • the communication device shown in the embodiment of the present application may also have more components than shown in FIG. 8 , and the embodiment of the present application does not limit this.
  • the methods performed by the processor and transceiver shown above are only examples. For specific steps performed by the processor and transceiver, please refer to the method introduced above.
  • the processing unit 701 may be one or more logic circuits, and the transceiver unit 702 may be an input-output interface, also known as a communication interface, or an interface circuit. , or interface, etc.
  • the transceiver unit 702 may also be a sending unit and a receiving unit.
  • the sending unit may be an output interface
  • the receiving unit may be an input interface.
  • the sending unit and the receiving unit may be integrated into one unit, such as an input-output interface.
  • the communication device shown in FIG. 9 includes a logic circuit 901 and an interface 902 .
  • the above-mentioned processing unit 701 can be implemented by the logic circuit 901, and the transceiver unit 702 can be implemented by the interface 902.
  • the logic circuit 901 can be a chip, a processing circuit, an integrated circuit or a system on chip (SoC) chip, etc.
  • the interface 902 can be a communication interface, an input/output interface, a pin, etc.
  • FIG. 9 takes the above communication device as a chip.
  • the chip includes a logic circuit 901 and an interface 902 .
  • the logic circuit and the interface may also be coupled to each other.
  • the embodiments of this application do not limit the specific connection methods of the logic circuits and interfaces.
  • the communication device may be used to perform steps or functions performed by the UE in the above method embodiments, etc.
  • the broadcast messages include indication information.
  • the indication information is used to indicate that an SI window includes Nw sub-windows. Each sub-window in the Nw sub-windows corresponds to an SI message.
  • At least one SI message includes ephemeris information, and Nw is an integer greater than or equal to 2;
  • Logic circuit 901 is used to detect Nw SI messages based on broadcast messages.
  • interface 902 is also used to input SSB.
  • the communication device may be used to perform the steps or functions performed by the network device in the above method embodiments.
  • Logic circuit 901 used to determine Nw sub-windows included in a system information SI window
  • Interface 902 is used to output broadcast messages.
  • the broadcast messages include indication information.
  • the indication information is used to indicate that an SI window includes Nw sub-windows. Each sub-window in the Nw sub-windows corresponds to an SI message.
  • Nw SI messages at least An SI message includes ephemeris information, and Nw is an integer greater than or equal to 2.
  • interface 902 is also used to output SSB.
  • the communication device shown in the embodiments of the present application can be implemented in the form of hardware to implement the methods provided in the embodiments of the present application, or can be implemented in the form of software to implement the methods provided in the embodiments of the present application. This is not limited by the embodiments of the present application.
  • Embodiments of the present application also provide a wireless communication system.
  • the wireless communication system includes a sending end and a receiving end.
  • the sending end and the receiving end The terminal can be used to perform the method in any of the foregoing embodiments.
  • the sending end and receiving end may refer to the communication devices shown in FIGS. 7 to 9 .
  • this application also provides a computer program, which is used to implement the operations and/or processing performed by the UE in the method provided by this application.
  • This application also provides a computer program, which is used to implement the operations and/or processing performed by the network device in the method provided by this application.
  • This application also provides a computer-readable storage medium that stores computer code.
  • the computer code When the computer code is run on a computer, it causes the computer to perform the operations performed by the UE in the method provided by this application and/or deal with.
  • This application also provides a computer-readable storage medium, which stores computer code.
  • the computer code When the computer code is run on a computer, it causes the computer to perform the operations performed by the network device in the method provided by this application and/or or processing.
  • the computer program product includes a computer code or a computer program.
  • the computer code or computer program When the computer code or computer program is run on a computer, it causes the operations and/or processing performed by the UE in the method provided by this application. be executed.
  • the computer program product includes computer code or computer program.
  • the computer code or computer program When the computer code or computer program is run on a computer, it causes the operations performed by the network device in the method provided by this application and/or Processing is performed.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be an indirect coupling or communication connection through some interfaces, devices or units, or may be electrical, mechanical or other forms of connection.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the technical effects of the solutions provided by the embodiments of the present application.
  • each functional unit in various embodiments of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the above integrated units can be implemented in the form of hardware or software functional units.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a readable
  • the storage medium includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application.
  • the aforementioned readable storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, etc. that can store program code medium.

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Abstract

一种卫星通信方法和装置，该方法包括：网络设备确定一个系统信息SI窗口，该SI窗口包括Nw个子窗口，以及发送广播消息，对应的，终端设备接收该广播消息。其中，该广播消息包括指示信息，该指示信息用于指示一个SI窗口包括Nw个子窗口，且每个子窗口对应一个SI消息，Nw个SI消息中至少有一个SI消息包括星历信息。终端设备基于广播消息检测该Nw个SI消息。通过本申请实施例，可以有效提高检测效率。

Description

卫星通信方法及装置
本申请要求于2022年08月31日提交中国专利局、申请号为202211054429.X、申请名称为“卫星通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种卫星通信方法及装置。
背景技术
卫星的星历(也可以称为星历信息)，是人造卫星在各个时刻的位置数据列表等信息，常用于全球定位系统(global positioning system，GPS)。例如，为了从GPS观测量中计算出点位的位置，必须获知卫星观测时刻的三维坐标，这个观测时刻就是星历的参考时间。卫星星历提供轨道参数，星历可以用来决定卫星的坐标。在卫星通信中，由于卫星和地面距离较远，空口时延较大，终端设备需要准确的知道卫星在各个时刻的位置才能够提前计算出定时提前，这样才能确保初始接入过程的上下行同步过程顺利进行。并且低轨道(low earth orbit，LEO)卫星运动速度快导致的时延抖动、多普勒频偏大会极大的影响通信质量。为了地面终端能够准确纠正时频偏，卫星需要发送自身运行的轨道信息和位置信息给用户。
目前终端设备获取星历信息的方法可以如下所示：终端设备首先通过系统信息块(system information blocks，SIB)1获取该终端设备可以接收到的某个系统信息(system information，SI)消息，与该某个SI消息对应的SI窗口的时域位置和长度以及该某个SI消息所对应的SIB；通过上述信息，终端设备在SI窗口内盲检SI消息以及与该SI消息对应的SIB，从而基于SIB获取星历信息。
然而，上述方法终端设备检测效率较低。
发明内容
本申请实施例提供一种卫星通信方法及装置，可以有效提高终端设备的检测效率。
第一方面，本申请实施例提供一种卫星通信方法，所述方法包括：
接收广播消息，所述广播消息包括指示信息，所述指示信息用于指示一个系统信息(system information，SI)窗口中包括Nw个子窗口，所述Nw个子窗口中的每个子窗口对应一个SI消息，所述Nw个SI消息中至少有一个SI消息包括星历信息，所述Nw为大于或等于2的整数；基于所述广播消息检测所述Nw个SI消息。
一般来说，一个SI窗口对应一个SI消息，在非陆地网络(non-terrestrial networks，NTN)通信系统中SI窗口往往会比较大。因此一个SI窗口对应一个SI消息时会影响终端设备的检测开销，导致该终端设备在一个比较大的SI窗口内检测一个SI消息，不仅浪费终端设备的检测开销，还会使得检测效率低下。
本申请实施例中，将一个SI窗口划分为Nw个子窗口，每个子窗口对应一个SI消息，由此，终端设备可以在至少一个SI消息内获得SIB19，该SI消息所对应的子窗口的长度小于SI窗口，因此可以有效提高终端设备的检测效率，提高了检测到SIB19的效率。可选地，每个子窗口对应一个SI消息，从而可以使得一个SI窗口内可以包括多个SI消息，如这多个SI消息可以对应不同类型的SIB，提高了配置的灵活性。
在一种可能的实现方式中，所述每个子窗口中的检测时机(monitoring occasions，MO)对应于所述SI窗口中每M个系统帧(system frame，SF)中的一组MO，所述M为大于或等于2的整数。
在一种可能的实现方式中，所述每M个SF包括第一组MO，所述第一组MO满足如下至少一项条件：所述第一组MO中的MO对应同一个SF；所述第一组MO中的MO对应至少两个SF。
在一种可能的实现方式中，所述第一组MO包括由偶数索引的SF中与SIB19对应的MO。
本申请实施例中，将偶数索引的SF中与SIB19对应的MO划分为一组，从而使得该组对应的子窗口内的MO均可以是网络设备发送SIB19的MO，不仅保证了UE可以快速的检测到SIB19，而且由于该组内的每个MO都对应SIB19，有效提高了检测效率，还可以节省检测资源。
在一种可能的实现方式中，所述每个子窗口中的MO索引是从所述SI窗口中每M个SF中提取一组MO，再按照升序编号确定的。
本申请实施例中，通过对SI窗口中的MO进行提取，以及再按照编号从小到大的顺序排列，可使得UE能够基于一定的公式获取与其接收到的同步信号块(synchronization signal block，SSB)对应的SIB19。
在一种可能的实现方式中，所述方法还包括：接收同步信号块SSB，所述SSB的索引为K，与所述SSB对应的所述子窗口内的MO索引i满足如下条件：
i＝x*N+K
其中，x＝0,1,…,X-1，X＝ceil(S/N)，所述S表示所述子窗口中的MO的总数量，所述N表示所述SI窗口内的SSB总数量。
在一种可能的实现方式中，所述SSB的周期等于所述SI窗口的窗长。
本申请实施例中，SSB的周期等于SI窗口的窗长，从而有效改善了SSB周期不等于SI窗长时导致检测资源浪费的情况。本申请实施例中，一个SI窗口包括多个子窗口，每个子窗口可以对应一个SI消息，从而可以使得一个SI窗口内可以包括多个SI消息，如这多个SI消息可以对应不同类型的SIB，提高了配置的灵活性。
在一种可能的实现方式中，所述M的取值根据所述SSB的图样确定。
在一种可能的实现方式中，所述广播消息还包括如下至少一项信息：所述SI窗口的时频资源、所述Nw个子窗口中每个子窗口对应的SI消息的索引、每个SI对应的系统信息块SIB。
在一种可能的实现方式中，所述广播消息还包括如下至少一项信息：每M个SF中每组MO相对于每M个SF的起始位置的偏移量、每M个SF中每组MO的窗长、M的取值(也可以称为每组MO的周期)。
第二方面，本申请实施例提供一种卫星通信方法，所述方法包括：
确定一个系统信息SI窗口，所述SI窗口包括Nw个子窗口；发送广播消息，所述广播消息包括指示信息，所述指示信息用于指示一个SI窗口包括Nw个子窗口，所述Nw个子窗口中的每个子窗口对应一个SI消息，所述Nw个SI消息中至少有一个SI消息包括星历信息，所述Nw为大于或等于2的整数。
在一种可能的实现方式中，所述每个子窗口中的MO对应于所述SI窗口中每M个系统帧SF中的一组MO，所述M为大于或等于2的整数。
在一种可能的实现方式中，所述每M个SF包括第一组MO，所述第一组MO满足如下至少一项条件：所述第一组MO中的MO对应同一个SF；所述第一组MO中的MO对应至少两个SF。
在一种可能的实现方式中，所述第一组MO包括由偶数索引的SF中与SIB19对应的MO。
在一种可能的实现方式中，所述每个子窗口中的MO索引是从所述SI窗口中每M个SF中提取一组MO，再按照升序编号确定的。
在一种可能的实现方式中，所述方法还包括：发送同步信号块SSB，所述SSB的索引为K，与所述SSB对应的所述子窗口内的MO索引i满足如下条件：
i＝x*N+K
其中，x＝0,1,…,X-1，X＝ceil(S/N)，所述S表示所述子窗口中的MO的总数量，所述N表示所述SI窗口内的SSB总数量。
在一种可能的实现方式中，所述SSB的周期等于所述SI窗口的窗长。
在一种可能的实现方式中，所述M的取值根据所述SSB的图样确定。
在一种可能的实现方式中，所述广播消息还包括如下至少一项信息：所述SI窗口的时频资源、所述Nw个子窗口中每个子窗口对应的SI消息的索引、每个SI消息对应的系统信息块SIB。
在一种可能的实现方式中，所述广播消息还包括如下至少一项信息：每M个SF中每组MO相对于每M个SF的起始位置的偏移量、每M个SF中每组MO的窗长、M的取值(也可以称为每组MO的周期)。
在一种可能的实现方式中，所述Nw基于所述SI窗口中的MO的总数量和所述SI窗口中的同步信号块SSB的总数量确定。
在一种可能的实现方式中，所述Nw小于或等于Nmax，所述Nmax满足如下条件：
其中，所述SMO表示所述SI窗口中的MO的总数量，所述N表示所述SI窗口中的同步信号块SSB的总数量。
第三方面，本申请实施例提供一种通信装置，用于执行第一方面或第一方面的任意可能的实现方式中的方法。所述通信装置包括具有执行第一方面或第一方面的任意可能的实现方式中的方法的单元。示例性的，该通信装置可以包括处理单元和收发单元。
第四方面，本申请实施例提供一种通信装置，用于执行第二方面或第二方面的任意可能的实现方式中的方法。所述通信装置包括具有执行第二方面或第二方面的任意可能的实现方式中的方法的单元。示例性的，该通信装置可以包括处理单元和收发单元。
第五方面，本申请实施例提供一种通信装置，所述通信装置包括处理器，用于执行上述第一方面或第一方面的任意可能的实现方式所示的方法。或者，所述处理器用于执行存储器中存储的程序，当所述程序被执行时，上述第一方面或第一方面的任意可能的实现方式所示的方法被执行。
在一种可能的实现方式中，所述存储器位于所述通信装置之外。
在一种可能的实现方式中，所述存储器位于所述通信装置之内。
本申请实施例中，处理器和存储器还可以集成于一个器件中，即处理器和存储器还可以被集成在一起。
在一种可能的实现方式中，所述通信装置还包括收发器，所述收发器，用于接收信号和/或发送信号。
第六方面，本申请实施例提供一种通信装置，所述通信装置包括处理器，用于执行上述第二方面或第二方面的任意可能的实现方式所示的方法。或者，所述处理器用于执行存储器中存储的程序，当所述程序被执行时，上述第二方面或第二方面的任意可能的实现方式所示的方法被执行。
在一种可能的实现方式中，所述存储器位于所述通信装置之外。
在一种可能的实现方式中，所述存储器位于所述通信装置之内。
在本申请实施例中，处理器和存储器还可以集成于一个器件中，即处理器和存储器还可以被集成在一起。
在一种可能的实现方式中，所述通信装置还包括收发器，所述收发器，用于接收信号和/或发送信号。
第七方面，本申请实施例提供一种通信装置，所述通信装置包括逻辑电路和接口，所述逻辑电路和所述接口耦合；所述接口，用于输入广播消息；所述逻辑电路，用于基于该广播消息检测Nw个SI。
在一种可能的实现方式中，所述接口，还用于输入SSB。
第八方面，本申请实施例提供一种通信装置，所述通信装置包括逻辑电路和接口，所述逻辑电路和所述接口耦合；所述逻辑电路，用于确定一个SI窗口包括的Nw个子窗口；所述接口，用于输出广播消息。
在一种可能的实现方式中，所述接口，还用于输出SSB。
第九方面，本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质用于存储计算机程序，当其在计算机上运行时，使得上述第一方面或第一方面的任意可能的实现方式所示的方法被执行。
第十方面，本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质用于存储计算机程序，当其在计算机上运行时，使得上述第二方面或第二方面的任意可能的实现方式所示的方法被执行。
第十一方面，本申请实施例提供一种计算机程序产品，所述计算机程序产品包括计算机程序或计算机代码(或指令)，当其在计算机上运行时，使得上述第一方面或第一方面的任意可能的实现方式所示的方法被执行。
第十二方面，本申请实施例提供一种计算机程序产品，所述计算机程序产品包括计算机程序或计算机代码(或指令)，当其在计算机上运行时，使得上述第二方面或第二方面的任意可能的实现方式所示的方法被执行。
第十三方面，本申请实施例提供一种计算机程序，所述计算机程序在计算机上运行时，上述第一方面或第一方面的任意可能的实现方式所示的方法被执行。
第十四方面，本申请实施例提供一种计算机程序，所述计算机程序在计算机上运行时，上述第二方面或第二方面的任意可能的实现方式所示的方法被执行。
第十五方面，本申请实施例提供一种通信系统，该通信系统包括终端设备和网络设备，所述终端设备用于执行上述第一方面或第一方面的任意可能的实现方式所示的方法，所述网络设备用于执行上述第二方面或第二方面的任意可能的实现方式所示的方法。
附图说明
图1是本申请实施例提供的一种通信系统的结构示意图；
图2a是本申请实施例提供的一种在透传场景下的卫星通信系统的示意图；
图2b是本申请实施例提供的一种在再生场景下的卫星通信系统的示意图；
图2c是本申请实施例提供的一种在再生场景下的卫星通信系统的示意图；
图3a是本申请实施例提供的一种SSB图样的示意图；
图3b是本申请实施例提供的一种SSB对应的SI消息的搜索空间示意图；
图3c是本申请实施例提供的一种SSB对应的SI消息的搜索空间示意图；
图4是本申请实施例提供的一种卫星通信方法的流程示意图；
图5a是本申请实施例提供的一种子窗口的划分方式示意图；
图5b是本申请实施例提供的一种子窗口的划分方式示意图；
图6a是本申请实施例提供的一种子窗口的划分方式示意图；
图6b是本申请实施例提供的一种子窗口的划分方式示意图；
图6c是本申请实施例提供的一种子窗口的划分方式示意图；
图6d是本申请实施例提供的一种子窗口的划分方式示意图；
图7是本申请实施例提供的一种通信装置的结构示意图；
图8是本申请实施例提供的一种通信装置的结构示意图；
图9是本申请实施例提供的一种通信装置的结构示意图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地描述。
本申请的说明书、权利要求书及附图中的术语“第一”和“第二”等仅用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、系统、产品或设备等，没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元等，或可选地还包括对于这些过程、方法、产品或设备等固有的其它步骤或单元。
在本文中提及的“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员可以显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请中，“至少一个(项)”是指一个或者多个，“多个”是指两个或两个以上，“至少两个(项)”是指两个或三个及三个以上，“和/或”，用于描述关联对象的关联关系，表示可以存在三种关系，例如，“A和/或B”可以表示：只存在A，只存在B以及同时存在A和B三种情况，其中A，B可以是单数或者复数。“或”表示可以存在两种关系，如只存在A、只存在B；在A和B互不排斥时，也可以表示存在三种关系，如只存在A、只存在B、同时存在A和B。字符“/”一般表示前后关联对象是一种“或”的关系。“以下至少一项(个)”或其类似表达，是指这些项中的任意组合。例如，a，b或c中的至少一项(个)，可以表示：a，b，c，“a和b”，“a和c”，“b和c”，或“a和b和c”。
本申请实施例提供的方法可以应用于非陆地网络(non-terrestrial networks，NTN)通信系统，如图1所示，该通信系统可以包括终端设备、卫星(也可以称为卫星基站)以及地面站(也可以称为关口站、信关站)(gateway)。可理解，图1仅示出了一个卫星以及一个地面站，在实际使用中，可根据需要采取多卫星和/或多地面站的架构。其中，每个卫星可向一个或多个终端设备提供服务，每个卫星可对应于一个或多个地面站，每个地面站可对应于一个或多个卫星等等，本申请实施例中不予具体限定。
本申请实施例中的终端设备是一种具有无线收发功能的装置。终端设备可以与无线接入网(radio access network，RAN)中的接入网设备(或者也可以称为接入设备)进行通信。终端设备也可以称为用户设备(user equipment，UE)、接入终端、终端(terminal)、用户单元(subscriber unit)、用户站、移动站、远方站、远程终端、移动设备、用户终端、用户代理或用户装置等。在一种可能的实现方式中，终端设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)。在一种可能的实现方式中，终端设备可以是具有无线通信功能的手持设备、车载设备、可穿戴设备、传感器、物联网中的终端、车联网中的终端、无人机、第五代(5th generation，5G)网络以及未来网络中的任意形态的终端设备等，本申请实施例对此不作限定。为便于描述，下文将以UE为例说明本申请实施例提供的卫星通信方法。
可理解，本申请实施例示出的终端设备与终端设备之间还可以通过设备到设备(device-todevice，D2D)、机器到机器(machine to machine，M2M)等通信。本申请实施例所示的终端设备还可以是物联网(internet of things，IoT)中的设备。该IoT网络例如可以包括车联网。其中，车联网系统中的通信方式统称为车到其他设备(vehicle to X，V2X，X可以代表任何事物)，例如，该V2X可以包括：车辆到车辆(vehicle to vehicle，V2V)通信，车辆与基础设施(vehicle to infrastructure，V2I)通信、车辆与行人之间的通信(vehicle to pedestrian，V2P)或车辆与网络(vehicle to network，V2N)通信等。
本申请实施例中的地面站可用于连接卫星与基站，或卫星与核心网。本申请实施例中的卫星可为终端设备提供无线接入服务，调度无线资源给接入的终端设备，提供可靠的无线传输协议和数据加密协议等。 卫星可以是将人造地球卫星和高空飞行器等作为无线通信的基站，例如演进型基站(evolutional NodeB，eNB)和下一代节点B(next generation node B，gNB)等。或者，卫星也可以作为这些基站的中继，向终端设备透传这些基站的信号。因此，本申请的一些实现方式中，比如在卫星的透传场景下，网络设备可以为图1所示的基站(也可以称为地面基站)。图2a是本申请实施例提供的一种在透传场景下的卫星通信系统的示意图。示例性的，终端设备可以通过空口(该空口可以是各种类型的空口，例如5G空口等)接入网络，网络设备可以部署在地面基站上。卫星通过无线链路与地面站相连。地面站和地面基站通过有线或者无线与核心网相连。卫星之间可以存在无线链路，在图2a所示的系统中，卫星可以有透传转发功能(即对应的网络设备部署在地面)，卫星之间可以透传转发。在本申请的另一些实现方式中，比如在卫星的再生场景下，网络设备可以为图1所示的卫星。图2b是本申请实施例提供的一种在再生场景下的卫星通信系统的示意图。示例性的，终端设备可以通过空口(该空口可以是各种类型的空口，例如5G空口等)接入网络，网络设备可以部署在卫星上(如卫星的再生模式)，如基站或者部分基站功能部署在卫星上，卫星之间可以完成基站与基站之间的信令交互和用户数据传输，如图2c所示。
示例性的，图2a至图2c中的各个网元以及他们的接口可以如下所示：
终端设备可以通过空口接入卫星网络并发起呼叫，上网等业务。基站可以用于提供无线接入服务，调度无线资源给接入的终端设备，提供可靠的无线传输协议和数据加密协议等。地面站可以用于负责转发卫星和核心网之间的信令和业务数据。核心网可以用于用户接入控制、移动性管理、会话管理、用户安全认证或计费等。核心网可以由多个功能单元组成，如包括控制面和数据面的功能实体。示例性的，图2a至图2c所示的核心网可以包括接入移动管理功能(access and mobility management function，AMF)、会话管理功能(session management function，SMF)和用户面功能(user plane function，UPF)等。如AMF可以用于负责用户接入管理，安全认证，还有移动性管理等。UPF可以用于负责管理用户面数据的传输，流量统计等。图2a至图2c所示的空口可以理解为终端和基站之间的无线链路，或卫星与地面站之间的无线链路；Xn接口可以理解为基站和基站之间的接口，主要用于切换等信令交互；NG接口可以用于基站和核心网之间接口，用于交互核心网的非接入(non-access stratum，NAS)等信令，以及用户的业务数据。
可理解，在不同的无线接入技术的系统中，具备基站功能的设备的名称可能会有所不同，本申请实施例不再一一示出。
可选的，卫星可以是静止轨道(geostationary earth orbit，GEO)卫星，也可以是非静止轨道(none-geostationary earth orbit，NGEO)的中轨道(medium earth orbit，MEO)卫星或低轨道(low earth orbit，LEO)卫星，还可以是高空通信平台(high altitude platform station，HAPS)等。本申请实施例对于卫星的具体类型不作限定。
本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
在卫星通信系统的初始接入过程中，为了网络设备与UE在初始接入过程中的上行同步顺利完成，网络设备需要在下发系统信息块(system information blocks，SIB)1的同时发送星历信息给UE，让UE在一定时间内准确估计卫星的运行轨迹，并根据卫星的运行轨迹计算定时提前，利用定时提前，抵消空口时延带来的影响，实现卫星侧与UE侧的上下行同步流程。
卫星通信过程中，UE需要先正确解码同步信号块(synchronization signal block，SSB)，然后基于该SSB中的相关信息解码SIB1。网络设备可以通过SIB1告诉UE有哪些SI消息，每个SI消息包含了哪些SIB，这些SI消息会在哪个SI窗口发送以及SI窗口的时域位置和长度等，但不会告诉UE在SI窗口的哪些子帧调度了该SI消息。因此当UE需要某个SIB时，该UE会在该SIB对应的SI消息对应的SI窗口内的每个检测时机(monitoring occasions，MO)去尝试解码，直到成功接收到SI消息，以获得该SI消息对应的SIB。
可理解，本申请实施例所示的MO可以称为检测时机、盲检时机或PDCCH的MO或基于SI-RNTI加扰的PDCCH的MO等，对于该MO的具体说明可以参考相关协议，本申请实施例不作详述。本申请实施例所示的检测也可以称为盲检，如下文所示的检测和盲检可以相互替换。本申请实施例所示的SI窗口的窗长也可以称为SI窗口的长度或简称为SI窗长。
在介绍本申请实施例提供的卫星通信方法之前，以下介绍本申请实施例涉及的术语。
第一、SSB图样(pattern)
图3a是本申请实施例提供的一种SSB图样的示意图。对于子载波间隔为30KHz来说，在一个偶数索引的系统帧(system frame，SF)(10ms)内的前2ms，网络设备可以发送8个SSB，如SSB#0至SSB#7。图3a仅示例性示出了SSB#6和SSB#7占用的时隙，其他SSB占用的时隙不再一一示出。在一个偶数索引的SN内的后8ms交替发送SSB对应的SIB1和SIBx。其中，交替发送SSB对应的SIB1和SIBx，可以有效保证UE在接收到SIB1之后尽早拿到星历信息以完成上行同步流程。可理解，在奇数索引的SF中的后8ms中，网络设备可以用于发送下行消息，如SIB1、其他系统信息(other system information，OSI)、寻呼(paging)消息、随机接入响应(random access response，RAR)、消息4(message4，Msg4)中的至少一项。示例性的，SIBx可以包括SIB19，或SIB2等，本申请实施例对此不作限定。为便于描述，下文将以星历信息包含于SIB19中为例说明本申请实施例提供的卫星通信方法。
可理解，本申请实施例所示的方法中涉及的偶数索引的SF以及奇数索引的SF均是以SI窗口中的第一个SF的索引为0为例示出的。如果SI窗口中的第一个SF的索引为1，则本申请实施例所示的偶数索引的SF可以替换为奇数索引的SF，以及奇数索引的SF可以替换为偶数索引的SF。
需要说明的是，以上是以子载波间隔为30KHz为例示出的SSB pattern，但是，不应将其理解为对本申请实施例的限定。也就是说，随着子载波间隔的变化，本申请实施例对于不同的子载波间隔所对应的SSB pattern均适用。举例来说，当子载波间隔为60KHz时，一个系统帧中可以包括40个时隙，这40个时隙中前4个时隙可以对应8个SSB，这40个时隙中的其余时隙可以用于交替发送SIB1和SIB19等。为便于描述，下文均以子载波间隔为30KHz为例进行说明。
需要说明的是，以上是以一个系统帧中的前4个时隙对应8个SSB为例示出的，SSB pattern也可能有其他形式，如一个系统帧中的前2个时隙对应4个SSB，该系统帧中的其余时隙可以用于交替发送SIB1和SIB19等。对于SSB pattern的形式，本申请实施例不作唯一性限定。
第二、SIBx的搜索空间(search space，SS)
5G NR有两种搜索空间：UE专用搜索空间和公共搜索空间。UE专用搜索空间是专门用于某个UE的(每个UE可能不同)，通过无线资源控制(radio resource control，RRC)消息配置。UE建立RRC连接后才能获取到UE专用搜索空间的相关信息。公共搜索空间是每个UE都必须盲检的搜索空间(比如某个SIB的PDCCH)，或是每个UE在建立专用连接前都适用的信令(比如RACH对应的PDCCH)。例如，在随机接入过程中，UE需要检测用于接收SIB1的PDCCH和其他一些PDCCH(DCI)(如Msg2/Msg4的DCI信息)。
对于NTN来说，星历信息可以包含于SIB19中，即UE需要检测SIB19的PDCCH以得到星历信息。UE可以通过如下公式(1)获得SSB对应的SIB19的PDCCH的MO。
j＝x*N+K     (1)
其中，j表示UE所得到的PDCCH的MO，x＝0,1,…,X-1，X＝ceil(SI窗口内PDCCH的MO的总数量/N)，N表示该SI窗口内的SSB总数量，K表示UE接收到的SSB的索引。
其中，UE可以从SIB1中获知SI窗口内PDCCH的MO的总数量和SI窗口内SSB总数量。以及UE可以基于其接收到的SSB获得该SSB的索引。
举例来说，SI窗长＝80个slot(对应40ms)，SI窗口内可用的PDCCH的MO总数量SMO＝80，SI窗口内SSB总数量N＝16，则X＝5。假设K＝0，则UE根据公式(1)得到的与SSB#0对应的SIBx的PDCCH的MO依次为MO#0、MO#16、MO#32、MO#48、MO#64。假设K＝8，则UE根据公式(1)得到的与SSB#8对应的SIBx的PDCCH的MO依次为MO#8、MO#24、MO#40、MO#56、MO#72。图3b是本申请实施例提供的一种SSB对应的SI消息的搜索空间示意图。图3b中所示的系统帧号(system frame number，SFN)1、SFN3、SFN5和SFN7可以理解为网络设备在这些SFN上发送如下至少一项：OSI、寻呼消息、RAR、Msg4。也就是说，网络设备可以通过图3b所示的空白帧发送OSI、寻呼消息、RAR、Msg4中的至少一项。可理解，图3b所示的每两个系统帧包括一个空白帧仅为示例，如本申请实施例提供的卫星通信方法还可以适用于每三个系统帧包括两个空白帧等，这里不再一一列举。
UE会在SI窗口内的MO#0、MO#16、MO#32、MO#48、MO#64上盲检与SSB#0对应的SIBx，然而，对于网络设备来说，SSB#0对应的SIBx的发送位置是在SI窗口内的slot#5(如图3b中的MO#5)，从而导致UE获得的SIBx的PDCCH的MO与SSB pattern不匹配。UE会在SI窗口内的MO#8、MO#24、MO#40、MO#56、MO#72上盲检与SSB#8对应SIBx，然而，根据SSB pattern可知，网络设备是在SFN2中发送SSB#8，以及MO#8和MO#24分别位于SFN0、SFN1，从而导致UE在MO#8和MO#24上无法检测到SSB#8对应的SIBx。根据SSB pattern可知，SSB#8对应的SIBx的发送位置是在SFN2中的MO#45，导致UE获 得的SIBx的PDCCH的MO与SSB pttern不匹配。根据上述所示的SIBx的PDCCH的MO与SSB pattern不匹配的问题，不仅会导致盲检资源的浪费，而且还会导致UE完全无法盲检到SIBx，从而增加UE的初始接入时延的问题。
通过本申请实施例提供的方法，一个SI窗口包括多个子窗口，每个子窗口可以对应一个SI消息，从而在UE能够检测到SI消息的基础上，有效提高检测效率，减少UE的初始接入时延。可选地，由于多个子窗口中至少有一个子窗口对应SIB19，且该SIB19对应的子窗口中的MO均对应于网络设备实际发送SIB19的位置，因此还可以有效节省盲检资源，减少UE的初始接入时延。
第三、SSB的周期与SI窗长
一般来说，网络设备可以通过SIB1中的系统信息块类型1(SystemInformationBlockType1)中的SI窗长(si-WindowLength)字段指示SI窗长。系统信息块类型1中的调度信息列表(schedulingInfoList)可以用于指示SI消息的列表，SI消息在该列表中的顺序可以以n表示(从1开始)。示例性的，假设调度信息列表中指定了4个SI消息，则会有4个连续的SI窗口用于发送这4个SI消息，而n表明了SI消息在第几个SI窗口。UE只能在对应的SI窗口内盲检SI消息。
SI窗口的起始帧满足SFN％T＝floor(x/N)，其中T为对应SI的周期，由si-Periodicity指定；SI窗口的起始slot为#a，其中a＝x％N。x决定了SI窗口在该SI周期内的起始帧和起始slot；SFN％T保证了SI窗口在SI周期内只出现一次；而x＝(n-1)*w保证了SI窗口之间紧挨不重叠，没有空隙。
下面举例说明如果SI窗长与SSB周期不相同带来的问题：
图3c是本申请实施例提供的一种SSB对应的SI消息的搜索空间示意图。如图3c所示，N＝256，SSB周期＝640ms，SI窗长＝320ms，SI窗口内PDCCH的MO个数＝640，X＝ceil(640/256)＝3。根据图3b所示的SSB与SI的PDCCH的MO的映射规则，一旦SI窗长与SSB周期不相同，则会出现如下问题：1.第一个SI窗的MO#0～MO#255对应SSB#0～SSB#255，而SSB#128～SSB#255还没发送。2.第二个SI窗的MO#0～MO#255依旧对应SSB#0～SSB#255，严重浪费盲检资源。由此，导致在当前SSB pattern下，一个SSB周期内只能配置一个SI消息。并且这个SI消息将包含所有的SIB类型，配置不够灵活。
本申请实施例提供的方法中，SI窗口的窗长可以与SSB周期相同。通过本申请实施例提供的方法，一个SI窗口包括多个子窗口，每个子窗口可以对应一个SI消息，从而可以使得一个SI窗口内可以包括多个SI消息，如这多个SI消息可以对应不同类型的SIB，提高了配置的灵活性。在每个SI窗口内UE可以盲检对应的SI消息，有效保证了初始接入过程中每个SSB对应的SIB19都能被UE盲检到，提高了UE的检测效率。
本申请实施例提供一种卫星通信方法及装置，可以有效解决上述SIB19的PDCCH的MO与SSB pattern不匹配的问题。本申请实施例中，一个SI窗口可以包括多个子窗口，每个子窗口都可以对应一个SI消息，由此每个SI消息对应的子窗口小于SI窗口，可以有效提高检测效率。UE可以在一个SI窗口内盲检多个SI消息，这样可以让SI消息的盲检更加灵活，尽可能的减少UE对于SIB19的盲检次数。
图4是本申请实施例提供的一种卫星通信方法的流程示意图，该方法可以应用于如图1所示的通信系统，或者，如图2a至图2c所示的通信系统。如图4所示，该方法包括：
401、网络设备发送广播消息，对应的，UE接收该广播消息，该广播消息包括指示信息，该指示信息用于指示一个SI窗口内包括Nw个子窗口，每个子窗口对应一个SI消息，Nw个SI消息中至少有一个SI消息包括星历信息。
其中，Nw为大于或等于2的整数。示例性的，广播消息可以包括SIB1。例如，指示信息可以包含于SIB1中的信息配置(configcommon)字段。可理解，本申请实施例所示的子窗口可以理解为虚拟窗口或SI子窗口等，本申请实施例对于该子窗口的具体名称不作限定。示例性的，上述SI窗口的周期(SI-periodicity)可以为如下任一项：{80,160,320,640,1280,2560,5120}ms。示例性的，SI窗口的窗长(SI-windowlength)可以为如下任一项：{5,10,20,40,80,160,320,640,1280}slots。可选地，为保证UE能够不间断的获取到星历信息，因此SI窗口的长度可以等于SI窗口的周期。
Nw个SI消息中至少有一个SI消息包括星历信息可以理解为：该Nw个SI消息中至少有一个SI消息对应SIB19(即UE可以从至少一个SI消息中检测到SIB19)，以及该SIB19中可以包括星历信息。
可理解，本申请实施例所示的星历信息仅为示例，但凡UE需要从SIB中获取到的信息都属于本申请实施例的保护范围。例如，Nw个SI消息中至少有一个SI消息对应SIB2(或SIB4)，该SIB2(或SIB4)可以包括小区切换信息。由此，UE在需要进行小区切换时，可以从该Nw个子窗口中的至少一个子窗口 中检测与SIB2对应的SI消息，从而获取小区切换信息。
指示信息可以用于指示Nw，该指示信息可以用于指示一个SI窗口所划分的多个子窗口的数量。作为一个示例，指示信息可以包括Nw，如网络设备可以通过索引的方式指示Nw，或者，通过比特位图的方式指示Nw，本申请实施例对此不作限定。指示信息中包括Nw时的实现方式，实现简单。作为另一个示例，指示信息可以包括Nw相对于参考值的偏移量。举例来说，Nw＝2，参考值为1，则偏移量为Nw-参考值＝1。又举例来说，Nw＝3，参考值为2，则偏移量可以为Nw-参考值＝2。又举例来说，Nw＝3，参考值为4，则偏移量可以为Nw-参考值＝-1。参考值可以由网络设备设置，如通过RRC消息配置给终端设备。参考值可以由协议定义等，不再一一列举。在Nw取值较大时，通过偏移量的实现方式指示Nw，可以有效节省信令开销。
可选地，广播消息还包括如下至少一项信息：SI窗口的时频资源、每个子窗口对应的SI消息的索引、每个SI消息对应的SIB。这里所示的SIB可以理解为除SIB1之外的SIB，如每个子窗口内可以包括一个或多个除SIB1之外的具有相同调度周期的SIB，即每个子窗口内包括的SIB具有相同的调度周期。广播消息中通过包括SI窗口的时频资源，可以使得终端设备能够在对应的时频资源上获知Nw个子窗口。广播消息中通过包括每个子窗口对应的SI消息的索引，可以使得终端设备能够获知每个子窗口包含了哪些SI消息。广播消息中通过包括每个SI消息对应的SIB，可以使得终端设备能够获知每个SI消息对应了哪些SIB，从而更准确地获知SIB19在哪个SI消息中，进而获知星历信息。可选地，广播消息还可以包括SS的排布方式，该SS的排布方式可以用于指示一个MO对应的时隙数量。示例性的，广播消息包括如下至少一项信息：MO的周期和MO的偏移量。MO的周期用于指示MO相对于一个SF的起始位置。如以图5a为例，则MO的周期可以是每个时隙对应一个MO，MO的偏移量可以为0。又如以图6a为例，则MO的周期可以是每两个时隙对应一个MO，MO的偏移量可以为0.5ms。根据SS的排布方式，UE可以有效获知一个MO所对应的时隙数量，如可以每2个时隙对应一个MO，又如可以每个时隙对应一个MO等，这里不再一一列举。
示例性的，一个SI消息可以与一个子窗口相关联，如每个子窗口内可以发送对应的SI消息(可以重复发送多次)。示例性的，不同子窗口的周期可以是相互独立的，不同子窗口之间可以互不重叠。一般来说，在一个子窗口内发送SI消息的次数、或者在哪些时隙上发送SI消息可以取决于网络设备的实现，通过本申请实施例提供的方法，UE如果想要获得SIB19，则该UE可以在该SIB19对应的子窗口内检测对应SI消息，从而改善了UE需要在整个SI窗口内检测该SI消息而带来的检测资源浪费的情况。当然，如果UE想要获得其他SIB，也可以在该SIB对应的子窗口内检测对应的SI消息，本申请实施例所示的SIB19仅为示例，不应将其理解为对本申请实施例的限定。
关于SI窗口与子窗口之间的关系可以如下所示：
Nw个子窗口中每个子窗口中的MO对应于SI窗口中每M个SF中的一组MO，该M为大于或等于2的整数。
本申请实施例中，每M个SF中可以包括Nw组MO，该Nw组MO中的一组MO可以对应一个子窗口，即Nw组MO中的每组MO所对应的子窗口不同。每M个SF对MO进行分组的方式相同。由于每M个SF对MO的分组方式相同，因为为便于描述，下文均以M个SF的分组方式为例进行说明，至于其他SF的分组方式以此类推。
每M个SF包括第一组MO，该第一组MO可以满足如下至少一项：该第一组MO中的MO可以对应同一个SF；或者，该第一组MO中的MO可以对应至少两个SF。这里所示的第一组MO仅为一般性描述，并不具有特指含义。
本申请实施例中，第一组MO可以包括由偶数索引的SF中与SIB19对应的MO(如可以包括全部，也可以包括部分)。可选地，该第一组MO还可以包括由奇数索引的SF中与SIB19对应的MO。可选地，该第一组MO不包括SSB占用的MO。对于第一组MO之外的其他组MO的划分方式，本申请实施例不作限定。
本申请实施例中，M的取值可以基于SSB pattern确定。举例来说，一个SI窗口内每2个SF中包括一个用于发送OSI、寻呼消息、RAR、Msg4等至少一项的SF，以及一个用于发送SSB的SF，则该M＝2。又举例来说，一个SI窗口内每3个SF中包括两个用于发送OSI、寻呼消息、RAR、Msg4等至少一项的SF，以及一个用于发送SSB的SF，则M＝3。也就是说，M的取值可以根据用于发送SSB的SF以及用于发送OSI、寻呼消息、RAR、Msg4等至少一项的SF确定。
作为一个示例，Nw＝2，一个SI窗口可以划分为两个子窗口。可选地，这两个子窗口包括的MO数量相同的情况下，一个子窗口可以由偶数索引的SF中与SIB19对应的MO组成，另一个子窗口可以由偶数索引的SF中其余的MO组成。其余的MO可以理解为一个偶数索引的SF中不与SIB19对应的MO。可选地，这两个子窗口包括的MO数量不相同的情况下，一个子窗口可以由偶数索引的SF中与SIB19对应的MO组成，另一个子窗口可以由其他不是SIB19对应的MO组成，如包括偶数索引的SF中其余的MO以及奇数索引的SF中的MO。作为另一个示例，Nw＝3，一个SI窗口可以划分为三个子窗口。可选地，这三个子窗口可以包括：由偶数索引的SF中与SIB19对应的MO组成的子窗口、由偶数索引的SF中其余的MO(指的是与SIB19对应的MO之外的MO)组成的子窗口、由奇数索引的SF中的MO组成的子窗口。可理解，除了与SIB19对应的子窗口之外的其他子窗口的划分方式仅为示例，在具体实现中，还可以基于UE想要获取的其他SIB划分子窗口。例如，UE在小区切换时，需要获取SIB2和SIB4，因此Nw＝3时，三个子窗口还可以包括：由偶数索引的SF中与SIB19对应的MO组成的子窗口、由SIB2对应的MO组成的子窗口以及SIB4对应的MO组成的子窗口。对于具体的子窗口的划分方式，本申请实施例不作限定。
可理解，为了确保UE有效地检测到SIB19以及尽最大可能地节省盲检资源，因此本申请实施例所示的由偶数索引的SF中与SIB19对应的MO组成的子窗口中可以不包括SSB占用的MO。可选地，本申请实施例所示的子窗口中均可以不包括SSB占用的MO。
可选地，上述Nw基于SI窗口中的基于SI-RNTI加扰的PDCCH的MO的总数量和SI窗口中的SSB的总数量确定。或者，也可以理解为Nw与SI窗口中的基于SI-RNTI加扰的PDCCH的MO的总数量和SI窗口中的SSB的总数量有关。
根据上述公式(1)来说，根据SI窗口内的PDCCH的MO的总数量和该SI窗口内的SSB的总数量可以确定UE在一个SI窗口内可能盲检到SIB19的MO的数量。本申请实施例中，作为一个示例，如果每个子窗口内都可以包括一个可能盲检到与子窗口对应的SI消息的MO，或者，也可以理解为如果每个SSB都可以对应一个MO，则Nw小于或等于Nmax，该Nmax满足如下条件：
Nmax＝floor(SMO/N)    (2)
其中，SMO表示SI窗口中的基于SI-RNTI加扰的PDCCH的MO的总数量，N表示SI窗口中的SSB的总数量。
作为另一个示例，如果可以存在至少一个子窗口内可以不出现SI消息则Nw的数量也可以大于上述Nmax，或者小于或等于Nmax。当然，对于Nw的具体取值可以由网络设备决定，对于Nw的具体数值，本申请实施例不作限定。
在一种可能的实现方式中，图4所示的方法还包括：
402、网络设备发送SSB，对应的，UE接收该SSB。
SSB的索引为K，与该SSB对应的子窗口内的MO索引i满足如下条件：
i＝x*N+K     (3)
其中，x＝0,1,…,X-1，X＝ceil(S/N)，所述S表示子窗口中的基于SI-RNTI加扰的PDCCH的MO的总数量，N表示一个SI窗口内的SSB总数量。
可理解，本申请实施例所示的序号“401”和“402”并不代表先后顺序。
本申请实施例中，SSB的周期等于SI窗口的窗长。举例来说，SI窗长＝SSB周期＝80个slot，SI窗口内可用的PDCCH的MO总数量SMO＝80，SI窗口内SSB总数量N＝16，以及Nw＝2。作为一个示例，图5a是本申请实施例提供的一种子窗口的划分方式示意图。如图5a所示，两个子窗口包括的MO数量相同，这两个子窗口分别为子窗口1和子窗口2，子窗口1和子窗口2均包括16个MO。其中，子窗口1可以对应于SI窗口中的偶数索引的SF中的奇数索引MO，子窗口2可以对应于SI窗口中的偶数索引的SF中的偶数索引MO。图5a中，子窗口1和子窗口2均不包括SSB占用的MO。子窗口1中的MO与SI窗口中的MO的对应关系可以如图5a所示，子窗口2中的MO与SI窗口中的MO的对应关系可以如图5a所示。可理解，图5a仅示例性地示出了子窗口1和子窗口2对应一个SF的情况，对应其他SF的情况可以以此类推。
根据公式(3)，X＝ceil(16/16)＝1，即x＝0。当K＝0时，与SSB#0对应的每个子窗口内的MO索引i＝0。即UE可以分别在2个子窗口内的MO#0盲检与子窗口1对应的SI消息以及与子窗口2对应的SI消息。当K＝8时，与SSB#8对应的每个子窗口内的MO索引i＝8，即UE可以分别在两个子窗口内的MO#8盲检与子窗口1对应的SI消息以及与子窗口2对应的SI消息。其中，子窗口1中的MO#0相当于SI窗口中SFN0中的MO#5，子窗口1中的MO#8相当于SI窗口中的SFN2中的MO#45。子窗口2中的MO#0 相当于SI窗口中SFN0中的MO#4，子窗口2中的MO#8相当于SI窗口中SFN2中的MO#44。
对于网络设备来说，SSB#0对应的SIB19的发送位置是在SI窗口内的slot#5(如图5a中的MO#5)。网络设备是在SFN2中发送SSB#8。从图3b所示的方法中可以看出，图3b中会存在UE获取到的用于检测SIB19的MO与网络设备的发送位置不匹配的问题。然而，通过本申请实施例提供的方法，当UE在子窗口MO#0上检测SI消息时，可以获取到该SI消息对应的SIB19，从而得到星历信息。
从图3b所示的方法中可以看出，图3b会存在UE未接收到SSB#8但是需要在SI窗口内的MO#8、MO#24上盲检SIB19的情况，从而导致UE不仅无法检测到与SSB#8对应的SIB19，还会导致浪费盲检资源。然而，通过本申请实施例提供的方法，当UE接收到SSB#8时，可以在子窗口1中的MO#8检测SI消息，从而获取与该SI消息对应的SIB19以及星历信息。通过本申请实施例，UE可以在子窗口1内的MO上检测SIB19，从而不仅有效减少了UE盲检SIB19时所使用的盲检资源，而且还可以保证UE能够盲检到SIB19。
作为另一个示例，图5b是本申请实施例提供的一种子窗口的划分方式示意图。如图5b所示，两个子窗口包括的MO数量不相同，这两个子窗口分别为子窗口1和子窗口2，子窗口1包括16个MO，子窗口2包括48个MO。其中，子窗口1可以对应于SI窗口中的偶数索引的SF中的奇数索引MO，且不包括SSB占用的MO。子窗口2可以对应于SI窗口中除子窗口1对应的MO之外的其余MO(如图5b所示)；或者，子窗口2可以对应于SI窗口中的偶数索引的SF中的偶数索引MO以及SI窗口中的奇数索引的SF。子窗口2不包括SSB占用的MO。对于子窗口2包括的MO的具体方式，本申请实施例不作限定。对于子窗口1中的MO与SI窗口中的MO的对应关系可以如图5b所示。
根据公式(3)，对于子窗口1来说，X＝ceil(16/16)＝1，即x＝0。当K＝0时，与SSB#0对应的子窗口1内的MO索引i＝0。即UE可以在子窗口1内的MO#0盲检与子窗口1对应的SI消息。当K＝8时，与SSB#8对应的子窗口1内的MO索引i＝8，即UE可以在子窗口1内的MO#8盲检与子窗口1对应的SI消息。根据公式(3)，对于子窗口2来说，X＝ceil(48/16)＝3，即x＝0、1、2。当K＝0时，与SSB#0对应的子窗口1内的MO索引i＝0、16、32。即UE可以在子窗口2内的MO#0、MO#16、MO#32盲检与子窗口2对应的SI消息。当K＝8时，与SSB#8对应的子窗口2内的MO索引i＝8、24、40，即UE可以在子窗口2内的MO#8、MO#24、MO#40盲检与子窗口2对应的SI消息。
可理解，本申请实施例是以每M个SFN包括Nw组MO为例示出的，但是，不应将其理解为对本申请实施例的限定。如果每M个SFN包括2*Nw组MO，则每M个SFN中的两组MO可以对应一个子窗口，由此也可以达到与每M个SFN包括Nw组MO相同的效果。
对于某个Nw来说，如果存在多种子窗口的划分方式，则网络设备可以通过广播消息指示UE子窗口的具体划分方式。示例性的，指示信息中可以包括Nw以及与该Nw对应的子窗口的划分方式。
可选地，与Nw对应的子窗口的划分方式可以以索引的方式指示，如Nw＝2时，子窗口的划分方式可以有两种，则这两种的索引可以依次为0和1。由此，指示信息中可以包括Nw以及索引1(或索引0)。可选地，与Nw对应的子窗口的划分方式可以以比特位图的方式指示，如Nw＝3时，子窗口的划分方式有四种，则这四种的比特位图的长度可以为4个比特，对应比特为0可以表示不采用对应的子窗口的划分方式，对应比特为1可以表示采用对应的子窗口的划分方式。如比特位图为0001，则表示当Nw＝3时，可以采用第一种子窗口的划分方式。可理解，这里所示的通过索引的方式或比特位图的方式指示子窗口的划分方式，可以理解为UE已提前获取到不同Nw下的子窗口的划分方式。可理解，还可以将每种子窗口的划分方式都设置一种索引，从而当Nw固定时，网络设备可以通过将每种子窗口的划分方式的索引指示给UE，使得UE获知子窗口的具体划分方式。
可选地，UE还可以不提前获取不同Nw下的子窗口的划分方式，网络设备可以在广播消息中将具体的划分方式指示给UE。可选地，广播消息中可以包括至少一个子窗口的划分方式。例如，广播消息中还可以包括如下至少一项：每M个SF中每组MO相对于每M个SF的起始位置的偏移量，每M个SF中每组MO的窗长，M的取值(也可以理解为每组MO的周期)。例如，对于图5a来说，广播消息中可以包括2(即SI窗口划分为2个子窗口)、子窗口1相对于每2个SF的起始位置的偏移量即5个MO(或2.5ms)、子窗口2相对于每2个SF的起始位置的偏移量即4个MO(或2ms)、每M个SF中子窗口1的窗长即16个MO(或8ms)、每M个SF中子窗口2的窗长即16个MO(或8ms)，每组MO的周期为2个SF。当然，以上所示的2个子窗口的数量还可以不明确包含在广播消息中，而是通过偏移量或窗长的不同取值的个数来指示子窗口的数量。对于其他未示出的信息可以理解为UE已经提前获知，如子窗口1和子窗口2中的MO均来自于偶数索引的SF，子窗口1中的16个MO分别对应于SFN0和SFN2的奇数索引的MO， 子窗口2中的16个MO分别对应于SFN1和SFN2的偶数索引的MO。又例如，对于图5b来说，广播消息中可以包括2(即SI窗口划分为2个子窗口)、子窗口1相对于每2个SF的起始位置的偏移量即5个MO(或2.5ms)、每M个SF中子窗口1的窗长即16个MO(或8ms)，每组MO的周期为2个SF。可选地，子窗口2的划分方式可以由UE自主确定。可选地，子窗口2的划分方式可以包含于广播消息中。如广播消息中可以包括：2、子窗口1相对于每2个SF的起始位置的偏移量、子窗口1的窗长、子窗口2相对于偶数索引的SF的起始位置的偏移量(如图5b所示的2ms)、子窗口2相对于奇数索引的SF的起始位置的偏移量(如图5b所示的2ms)、每2个SF中子窗口2的窗长(12ms)。
可理解，图5b是以子窗口2不包括奇数索引的SF中的前四个MO为例示出的，但是不应将其理解为对本申请实施例的限定。如子窗口2可以包括奇数索引的SF中的前四个MO(也可以理解前四个时隙)。可理解，本申请实施例所示的每组MO还可以称为突发(burst)窗口或突发窗等，本申请实施例对于每组MO的名称不作限定。
可理解，这里是以图5a和图5b为例，对于其他Nw的取值以及子窗口的划分方式同样适用，本申请实施例不再一一列举。
可理解，本申请实施例所示的子窗口的划分方式适用于网络设备侧，也适用于终端设备侧。例如，对于网络设备来说，该网络设备在发送广播消息之前，网络设备可以确定一个SI窗口，该SI窗口包括Nw个子窗口。示例性的，确定一个SI窗口所包括的Nw个子窗口的方式可以参考本申请实施例所示的子窗口的划分方式，如可以基于SSB图样以及SIB19的发送情况确定一个SI窗口中包括的子窗口的数量，即确定一个SI窗口中包括Nw个子窗口。对于网络设备确定Nw子窗口的方式可以参考本申请实施例所示的子窗口的划分方式的说明。
403、终端设备基于广播消息检测Nw个SI消息。
举例来说，Nw＝2，则终端设备可以在一个SI窗口内检测2个SI消息。又举例来说，Nw＝3，则终端设备可以在一个SI窗口内检测3个SI消息。又举例来说，Nw＝4，则终端设备可以在一个SI窗口内检测4个SI消息。每个S消息I都可以对应一个SIB，如SIB2、SIB3、SIB19，这里不再一一列举。
UE检测到对应子窗口内的SI消息之后，可以基于对应子窗口内的SI消息获取SIB19，从而得到SIB19中包括的星历信息。或者，UE可以基于对应子窗口内的SI消息获取SIB2，从而得到SIB2中包括的小区切换信息等，这里不再一一列举。
本申请实施例中，将一个SI窗口划分为Nw个子窗口，每个子窗口对应一个SI消息，由此，终端设备可以在至少一个SI内获得SIB19，该SI消息所对应的子窗口的长度小于SI窗口，因此可以有效提高终端设备的检测效率，提高了检测到SIB19的效率。可选地，每个子窗口对应一个SI消息，从而可以使得一个SI窗口内可以包括多个SI消息，如这多个SI消息可以对应不同类型的SIB，提高了配置的灵活性。
为更详细地理解本申请实施例所示的Nw个子窗口，以下将举例说明。
示例一
SI窗长＝SSB周期＝SI周期＝640ms，SMO＝640，N＝256，Nw＝2(仅为示例)，子窗口对应的SI消息的索引依次为2、4。子窗口1和子窗口2均包括256个即S＝256，X＝ceil(256/256)＝1，x＝0。如图6a所示，子窗口1内的MO对应于SI窗长内的偶数索引的SF内的MO，不包括SSB占用的MO(也可以理解为SSB占用的时隙对应的MO)，且该子窗口1内的MO的索引是从小到大依次排列的(也可以理解为子窗口1内的MO的索引是基于从小大小的顺序重新编号得到的)。子窗口2内的MO可以对应于SI窗长内的奇数索引的SF内的MO，不包括奇数索引的SF内的前四个时隙对应的MO，且该子窗口2内的MO的索引是从小到大依次排列的(也可以理解为子窗口2内的MO的索引是基于从小大小的顺序重新编号得到的)。可选地，可选地，当子窗口1和子窗口2包括的MO数量可以不同的情况下，子窗口2还可以包括奇数索引的SF内前四个时隙对应的MO。
对于SSB#0来说，网络设备发送SIB19的实际位置是在MO#2，对于SSB#8来说，网络设备发送SIB19的实际位置是在MO#22。对于SSB#255来说，网络设备发送SIB19的实际位置是MO#639。
对于公式(1)来说，SSB#0对应的SIB19的PDCCH的MO的索引依次为：MO#0、MO#256、MO#512。SSB#8对应的SIB19的PDCCH的MO的索引依次为：MO#8、MO#264、MO#520。SSB#255对应的SIB19的PDCCH的MO的索引依次为：MO#255、MO#511。也就是说，UE根据其接收到的SSB的索引需要从上述MO获取SIB19。从公式(1)可以看出，当UE接收到SSB#0时，其在MO#0、MO#256、MO#512上无法检测到SIB19。当UE接收到SSB#8时，在MO#8时，UE还没接收到SSB#8，从而盲检资源的浪 费，以及在MO#264、MO#520上无法检测到SIB19。当UE接收到SSB#255时，UE在MO#255、MO#511上无法检测到SIB19。由此可见，将地面通信中的公式应用到NTN中会出现UE无法检测到SIB19的情况。
对于公式(3)来说，将SI窗口划分为2个子窗口，子窗口1和子窗口2，则每个子窗口均可以包括256个MO，对于每个子窗口来说，SSB#0对应的SIB19的PDCCH的MO的索引为MO#0。子窗口1中的MO#0相当于SI窗口中的MO#2，即子窗口1中的MO#0包含在网络设备发送SIB19的实际位置中。SSB#8对应的SIB19的PDCCH的MO的索引为MO#8，子窗口1中的MO#8相当于SI窗口中的MO#22，即子窗口1中的MO#8包含在网络设备发送SIB19的实际位置中。SSB#255对应的SIB19的PDCCH的MO的索引为MO#255，子窗口1中的MO#255相当于SI窗口中的MO#629，子窗口1中的MO#255包含于网络设备发送SIB19的实际位置中。UE可以从子窗口2中盲检与子窗口2对应的SI消息(如SI4消息)中包括的SIB(如可以是SIB2或SIB4等)。通过本申请实施例提供的方法，不仅保证了UE可以在获取到SSB之后再在对应的MO上盲检SIB19，而且还尽可能的达到了节省盲检资源的目的。
可选地，当UE未提前获取到不同Nw下的子窗口的划分方式时，广播消息中可以包括如下至少一项：M的取值；每2个SF中每组MO相对于每2个SF的起始位置的偏移量，如依次为2.5ms、2ms；每M个SF中每组MO的窗长，如依次为8ms、8ms；SI窗口的时频资源；每个子窗口对应的SI消息的索引；每个SI消息对应的SIB。可选地，在UE提前获取到不同Nw下的子窗口的划分方式时，广播消息中可以包括如下至少一项：SI窗口中包括2个子窗口、这2个子窗口的划分方式的索引、SI窗口的时频资源、每个子窗口对应的SI消息的索引、每个SI消息对应的SIB。
可理解，图6a是以SI窗长等于640ms为例示出的，如图6b所示，图6a所示的相关描述也可以适用于SI窗长等于320ms。示例性的，图6b中，SI窗长＝SSB周期＝SI周期＝320ms，SMO＝320，N＝128，Nw＝2，子窗口对应的SI消息的索引依次为2、4。子窗口1内的MO对应于SI窗长内的偶数索引的SFN内的MO，且不包括SSB占用的MO，子窗口2内的MO可以对应于SI窗长内的奇数索引的SFN内的MO，不包括奇数索引的SF内的前四个时隙对应的MO。对于SI窗口等于320ms的具体实现方式可以参考图6a的相关描述，不再详述。子窗口1中不包括SSB占用的MO，可以使得UE基于上述公式(3)方便快捷地获取其可以盲检到SIB19的MO的索引号。可选地，当子窗口1和子窗口2包括的MO数量可以不同的情况下，子窗口2还可以包括奇数索引的SF内的前四个时隙对应的MO。
可理解，图6a和图6b所示的子窗口2的划分方式仅为示例，如子窗口2还可以包括SSB占用的MO。
通过本申请实施例提供的方法，UE可以在子窗口1内检测SI2消息，以及在子窗口2内检测SI4消息，通过不同的子窗口检测不同的SI消息，提高了配置的灵活性，而且有效提高了检测效率。
示例二
SI窗长＝SSB周期＝SI周期＝1280ms，SMO＝1280，N＝512，Nw＝2(仅为示例)，子窗口对应的SI消息的索引依次为2、4。子窗口1和子窗口2均包括256个MO，即S＝256，X＝ceil(256/256)＝1，x＝0。如图6c所示，子窗口1内的MO对应于SI窗口内的偶数索引的SF内的MO中的部分MO，不包括SSB占用的MO，且该子窗口1内的MO的索引是从小到大依次排列的。或者，子窗口1也可以理解为：子窗口1内的MO对应于SI窗口内偶数索引的SF内的不包括SSB占用的MO之外的前四个MO。上述部分MO可以理解为如图6c中所示的偶数索引的SF中的第一个小窗长。子窗口2内的MO对应于SI窗长内的奇数索引的SF内的部分MO，且该子窗口2内的MO的索引是从小到大依次排列的。子窗口2内的MO可以理解为奇数索引的SF内的第一个小窗长(图6c未示出)。或者，子窗口2也可以理解为：子窗口2内的MO对应于SI窗口内奇数索引的SF内的除前两个时隙对应的MO之外的前四个MO。
可理解，图6c是以每2个SN中包括四个SSB为例示出的，且该四个SSB分别对应偶数索引的SF内的第三个时隙到第十个时隙。如果该四个SSB分别对应偶数索引的SF内的第十一个时隙至十八个时隙，则子窗口1内的MO可以对应于偶数索引的SF内的第二个小窗长，如图6c所示的第二个小窗长。图6c所示的小窗长可以理解为一组MO，图6c所示的对子窗口2的划分方式仅为示例，不应将其理解为对本申请实施例的限定。
基于上述公式(3)，对于每个子窗口来说，SSB#0对应的SIB19的PDCCH的MO的索引为MO#0。子窗口1中的MO#0相当于SI窗口中的MO#1，子窗口1中的MO#0包含在网络设备发送SIB19的实际位置中。SSB#8对应的SIB19的PDCCH的MO的索引为MO#8，子窗口1中的MO#8相当于SI窗口中的MO#41，子窗口1中的MO#8包含在网络设备发送SIB19的实际位置中。UE可以从子窗口2中盲检与子窗口2对应的SI消息(如SI4消息)中包括的SIB(如可以是SIB2或SIB4等)。
通过本申请实施例提供的方法，不仅保证了UE可以在获取到SSB之后再在对应的MO上盲检SIB19，提高UE的检测效率，而且还尽可能的达到了节省盲检资源的目的。
示例三
SI窗长＝SSB周期＝SI周期＝640ms，SMO＝1280，N＝256，Nw＝2(仅为示例)，子窗口对应的SI消息的索引依次为2、4。子窗口1和子窗口2均包括256个MO，即S＝256，X＝ceil(256/256)＝1，x＝0。如图6d所示，子窗口1内的MO对应于SI窗口内的偶数索引的SF内的奇数索引的MO，不包括SSB占用的MO，且该子窗口1内的MO的索引是从小到大依次排列的。子窗口2内的MO对应于SI窗口内的奇数索引的SF内的奇数索引的MO，不包括奇数索引的SF内的前四个时隙对应的MO(仅为示例)。可选地，子窗口2内的MO可以对应于SI窗口内的奇数索引的SF内的偶数索引的MO，不包括奇数索引的SF内的前四个时隙对应的MO(仅为示例)。可选地，子窗口2内的MO可以对应于SI窗口内的偶数索引的SF内的偶数索引的MO，不包括SSB占用的MO。可选地，子窗口2内的MO可以对应于SI窗口内的偶数索引的SF内的偶数索引的MO，以及SI窗口内的奇数索引的SF内的偶数索引(或奇数索引)的MO。可选地，子窗口2内的MO可以对应于SI窗口内的偶数索引的SF内的偶数索引的MO，以及SI窗口内的奇数索引的SF的MO。子窗口1和子窗口2内的MO的索引从小到大重新排序。
根据公式(3)，对于每个子窗口来说，SSB#0对应的SIB19的PDCCH的MO的索引为MO#0。子窗口1中的MO#0相当于SI窗口中的MO#5，子窗口1中的MO#0包含在网络设备发送SIB19的实际位置中。通过图6d，UE可以高效率地检测到与子窗口1对应的SI消息(如SI2消息)中的SIB19，以及检测到与子窗口2对应的SI消息(如SI4消息)中的SIB(如SIB2或SIB4等)。可理解，对于图6d的具体说明可以参考上文，这里不再详述。
本申请实施例中，通过将SI窗口分成多个子窗口，使得一个SI窗口内可以实现多个SI消息的盲检。并且通过灵活配置子窗口的位置，可使得SI的PDCCH的MO与当前NTN场景下的SSB pattern更加匹配，配置方式也更加灵活。不仅节约UE在盲检SI消息时的盲检资源，更加精准高效的得到SI消息中的星历信息，还减少初始接入时间，提高用户体验。
以下将介绍本申请实施例提供的通信装置。
本申请根据上述方法实施例对通信装置进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。下面将结合图7至图9详细描述本申请实施例的通信装置。
图7是本申请实施例提供的一种通信装置的结构示意图，如图7所示，该通信装置包括处理单元701和收发单元702。
在本申请的一些实施例中，该通信装置可以是上文示出的UE或终端设备或芯片，该芯片可以设置于终端设备或UE中。即该通信装置可以用于执行上文方法实施例(包括图4)中由UE执行的步骤或功能等。
收发单元702，用于接收广播消息，该广播消息包括指示信息，该指示信息用于指示一个SI窗口中包括Nw个子窗口，该Nw个子窗口中的每个子窗口对应一个SI消息，Nw个SI消息中至少有一个SI消息包括星历信息，Nw为大于或等于2的整数；
处理单元701，用于基于广播消息检测Nw个SI消息。
在一种可能的实现方式中，每个子窗口中的MO对应于SI窗口中每M个SF中的一组MO，M为大于或等于2的整数。
在一种可能的实现方式中，每M个SF包括第一组MO，第一组MO满足如下至少一项条件：第一组MO中的MO对应同一个SF；第一组MO中的MO对应至少两个SF。
在一种可能的实现方式中，第一组MO包括由偶数索引的SF中与SIB19对应的MO。
在一种可能的实现方式中，每个子窗口中的MO索引是从SI窗口中每M个SF中提取一组MO，再按照升序编号确定的。
在一种可能的实现方式中，收发单元702，还用于接收SSB，SSB的索引为K，与SSB对应的子窗口内的MO索引i满足如下条件：
i＝x*N+K
其中，x＝0,1,…,X-1，X＝ceil(S/N)，S表示子窗口中的MO的总数量，N表示SI窗口内的SSB总数量。
在一种可能的实现方式中，SSB的周期等于SI窗口的窗长。
在一种可能的实现方式中，M的取值根据SSB的图样确定。
在一种可能的实现方式中，广播消息还包括如下至少一项信息：SI窗口的时频资源、Nw个子窗口中每个子窗口对应的SI消息的索引、每个SI消息对应的系统信息块SIB。
以上所示的收发单元和处理单元的具体说明仅为示例，对于收发单元和处理单元的具体功能或执行的步骤等，可以参考上述方法实施例，这里不再详述。关于SI窗口、子窗口、Nw、M以及第一组MO等说明还可以参考上文方法实施例中的介绍，这里不再一一详述。
在本申请的另一些实施例中，该通信装置可以是上文示出的网络设备或芯片，该芯片可以设置于网络设备中。即该通信装置可以用于执行上文方法实施例(包括图4)中由网络设备执行的步骤或功能等。
处理单元701，用于确定一个系统信息SI窗口包括的Nw个子窗口；
收发单元702，用于发送广播消息，广播消息包括指示信息，该指示信息用于指示一个SI窗口包括Nw个子窗口，该Nw个子窗口中的每个子窗口对应一个SI消息，Nw个SI消息中至少有一个SI消息包括星历信息，Nw为大于或等于2的整数。
在一种可能的实现方式中，每个子窗口中的MO对应于SI窗口中每M个系统帧SF中的一组MO，M为大于或等于2的整数。
在一种可能的实现方式中，每M个SF包括第一组MO，第一组MO满足如下至少一项：第一组MO中的MO来自于同一个SF；第一组MO中的MO来自于至少两个SF。
在一种可能的实现方式中，第一组MO包括由偶数索引的SF中与SIB19对应的MO。
在一种可能的实现方式中，每个子窗口中的MO索引是从SI窗口中每M个SF中提取一组MO，再按照升序编号确定的。
在一种可能的实现方式中，收发单元702，还用于发送同步信号块SSB，SSB的索引为K，与SSB对应的子窗口内的MO索引i满足如下条件：
i＝x*N+K
其中，x＝0,1,…,X-1，X＝ceil(S/N)，S表示子窗口中的MO的总数量，N表示SI窗口内的SSB总数量。
在一种可能的实现方式中，SSB的周期等于SI窗口的窗长。
在一种可能的实现方式中，M的取值根据SSB的图样确定。
在一种可能的实现方式中，广播消息还包括如下至少一项信息：SI窗口的时频资源、Nw个子窗口中每个子窗口对应的SI消息的索引、每个SI消息对应的系统信息块SIB。
在一种可能的实现方式中，Nw基于SI窗口中的MO的总数量和SI窗口中的同步信号块SSB的总数量确定。
在一种可能的实现方式中，Nw小于或等于Nmax，Nmax满足如下条件：
其中，SMO表示SI窗口中的MO的总数量，N表示SI窗口中的同步信号块SSB的总数量。
以上示出的收发单元和处理单元的具体说明仅为示例，对于收发单元和处理单元的具体功能或执行的步骤等，可以参考上述方法实施例，这里不再详述。关于SI窗口、子窗口、Nw、M以及第一组MO等说明还可以参考上文方法实施例中的介绍，这里不再一一详述。
以上介绍了本申请实施例的通信装置，以下介绍所述通信装置可能的产品形态。应理解，但凡具备上述图7所述的通信装置的功能的任何形态的产品，都落入本申请实施例的保护范围。还应理解，以下介绍仅为举例，不限制本申请实施例的通信装置的产品形态仅限于此。
在一种可能的实现方式中，图7所示的通信装置中，处理单元701可以是一个或多个处理器，收发单元702可以是收发器，或者收发单元702还可以是发送单元和接收单元，发送单元可以是发送器，接收单元可以是接收器，该发送单元和接收单元集成于一个器件，例如收发器。本申请实施例中，处理器和收发器可以被耦合等，对于处理器和收发器的连接方式，本申请实施例不作限定。在执行上述方法的过程中，上述方法中有关发送信息的过程，可以理解为由处理器输出上述信息的过程。在输出上述信息时，处理器 将该上述信息输出给收发器，以便由收发器进行发射。该上述信息在由处理器输出之后，还可能需要进行其他的处理，然后才到达收发器。类似的，上述方法中有关接收信息的过程，可以理解为处理器接收输入的上述信息的过程。处理器接收输入的信息时，收发器接收该上述信息，并将其输入处理器。更进一步的，在收发器收到该上述信息之后，该上述信息可能需要进行其他的处理，然后才输入处理器。
如图8所示，该通信装置80包括一个或多个处理器820和收发器810。
在本申请的一些实施例中，通信装置可以用于执行上述方法实施例中由UE执行的步骤或功能等。
收发器810，用于接收广播消息，该广播消息包括指示信息，该指示信息用于指示一个SI窗口中包括Nw个子窗口，该Nw个子窗口中的每个子窗口对应一个SI消息，Nw个SI消息中至少有一个SI消息包括星历信息，Nw为大于或等于2的整数；
处理器820，用于基于广播消息检测Nw个SI消息。
可理解，收发器810在接收到广播消息之后，处理器820可以用于接收输入的该广播消息，从而基于该广播消息检测Nw个SI消息。
在一种可能的实现方式中，收发器810，还用于接收SSB。
可理解，收发器810在接收到SSB之后，处理器820还可以用于接收输入的SSB，以及基于该SSB以及上述广播消息检测Nw个SI消息。
在本申请的另一些实施例中，通信装置可以用于执行上述方法实施例中由网络设备执行的步骤或功能等。
处理器820，用于确定一个系统信息SI窗口包括的Nw个子窗口；
收发器810，用于发送广播消息，广播消息包括指示信息，该指示信息用于指示一个SI窗口包括Nw个子窗口，该Nw个子窗口中的每个子窗口对应一个SI消息，Nw个SI消息中至少有一个SI消息包括星历信息，Nw为大于或等于2的整数。
可理解，处理器820，在确定一个SI窗口包括的Nw个子窗口之后，还可以输出广播消息，以便于由收发器810发送该广播消息。
在一种可能的实现方式中，收发器810，还用于发送SSB。
可理解，处理器820在生成SSB之后，还可以输出该SSB，以便于由收发器810发送该SSB。
可理解，本申请实施例示出的收发器和处理器的具体说明仅为示例，对于收发器和处理器的具体功能或执行的步骤等，可以参考上述方法实施例，这里不再详述。
本申请实施例中，关于SI窗口、子窗口、Nw、M以及第一组MO等说明还可以参考上文方法实施例中的介绍，这里不再一一详述。
在图8所示的通信装置的各个实现方式中，收发器可以包括接收机和发射机，该接收机用于执行接收的功能(或操作)，该发射机用于执行发射的功能(或操作)。以及收发器用于通过传输介质和其他设备/装置进行通信。
可选的，通信装置80还可以包括一个或多个存储器830，用于存储程序指令和/或数据等。存储器830和处理器820耦合。本申请实施例中的耦合是装置、单元或模块之间的间接耦合或通信连接，可以是电性，机械或其它的形式，用于装置、单元或模块之间的信息交互。处理器820可能和存储器830协同操作。处理器820可可以执行存储器830中存储的程序指令。可选的，上述一个或多个存储器中的至少一个可以包括于处理器中。
本申请实施例中不限定上述收发器810、处理器820以及存储器830之间的具体连接介质。本申请实施例在图8中以存储器830、处理器820以及收发器810之间通过总线840连接，总线在图8中以粗线表示，其它部件之间的连接方式，仅是进行示意性说明，并不引以为限。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图8中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
在本申请实施例中，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成等。
本申请实施例中，存储器可包括但不限于硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)等非易失性存储器，随机存储记忆体(Random Access Memory，RAM)、可擦除可编程只读存储器(Erasable Programmable ROM，EPROM)、只读存储器(Read-Only Memory，ROM)或便携式只读存储 器(Compact Disc Read-Only Memory，CD-ROM)等等。存储器是能够用于携带或存储具有指令或数据结构形式的程序代码，并能够由计算机(如本申请示出的通信装置等)读和/或写的任何存储介质，但不限于此。本申请实施例中的存储器还可以是电路或者其它任意能够实现存储功能的装置，用于存储程序指令和/或数据。
示例性的，处理器820主要用于对通信协议以及通信数据进行处理，以及对整个通信装置进行控制，执行软件程序，处理软件程序的数据。存储器830主要用于存储软件程序和数据。收发器810可以包括控制电路和天线，控制电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
当通信装置开机后，处理器820可以读取存储器830中的软件程序，解释并执行软件程序的指令，处理软件程序的数据。当需要通过无线发送数据时，处理器820对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到通信装置时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器820，处理器820将基带信号转换为数据并对该数据进行处理。
在另一种实现中，所述的射频电路和天线可以独立于进行基带处理的处理器而设置，例如在分布式场景中，射频电路和天线可以与独立于通信装置，呈拉远式的布置。
可理解，本申请实施例示出的通信装置还可以具有比图8更多的元器件等，本申请实施例对此不作限定。以上所示的处理器和收发器所执行的方法仅为示例，对于该处理器和收发器具体所执行的步骤可参照上文介绍的方法。
在另一种可能的实现方式中，图7所示的通信装置中，处理单元701可以是一个或多个逻辑电路，收发单元702可以是输入输出接口，又或者称为通信接口，或者接口电路，或接口等等。或者收发单元702还可以是发送单元和接收单元，发送单元可以是输出接口，接收单元可以是输入接口，该发送单元和接收单元集成于一个单元，例如输入输出接口。如图9所示，图9所示的通信装置包括逻辑电路901和接口902。即上述处理单元701可以用逻辑电路901实现，收发单元702可以用接口902实现。其中，该逻辑电路901可以为芯片、处理电路、集成电路或片上系统(system on chip，SoC)芯片等，接口902可以为通信接口、输入输出接口、管脚等。示例性的，图9是以上述通信装置为芯片为例出的，该芯片包括逻辑电路901和接口902。
本申请实施例中，逻辑电路和接口还可以相互耦合。对于逻辑电路和接口的具体连接方式，本申请实施例不作限定。
在本申请的一些实施例中，该通信装置可以用于执行上文方法实施例中由UE执行的步骤或功能等。
接口902，用于输入广播消息，该广播消息包括指示信息，该指示信息用于指示一个SI窗口中包括Nw个子窗口，该Nw个子窗口中的每个子窗口对应一个SI消息，Nw个SI消息中至少有一个SI消息包括星历信息，Nw为大于或等于2的整数；
逻辑电路901，用于基于广播消息检测Nw个SI消息。
在一种可能的实现方式中，接口902，还用于输入SSB。
在本申请的另一些实施例中，通信装置可以用于执行上述方法实施例中由网络设备执行的步骤或功能等。
逻辑电路901，用于确定一个系统信息SI窗口包括的Nw个子窗口；
接口902，用于输出广播消息，广播消息包括指示信息，该指示信息用于指示一个SI窗口包括Nw个子窗口，该Nw个子窗口中的每个子窗口对应一个SI消息，Nw个SI消息中至少有一个SI消息包括星历信息，Nw为大于或等于2的整数。
在一种可能的实现方式中，接口902，还用于输出SSB。
本申请实施例中，关于SI窗口、子窗口、Nw、M以及第一组MO等说明还可以参考上文方法实施例中的介绍，这里不再一一详述。
可理解，本申请实施例示出的逻辑电路和接口的具体说明仅为示例，对于收发单元和处理单元的具体功能或执行的步骤等，可以参考上述方法实施例，这里不再详述。
可理解，本申请实施例示出的通信装置可以采用硬件的形式实现本申请实施例提供的方法，也可以采用软件的形式实现本申请实施例提供的方法等，本申请实施例对此不作限定。
对于图9所示的各个实施例的具体实现方式，还可以参考上述各个实施例，这里不再详述。
本申请实施例还提供了一种无线通信系统，该无线通信系统包括发送端和接收端，该发送端和该接收 端可以用于执行前述任一实施例中的方法。或者，该发送端和接收端可以参考图7至图9所示的通信装置。
此外，本申请还提供一种计算机程序，该计算机程序用于实现本申请提供的方法中由UE执行的操作和/或处理。
本申请还提供一种计算机程序，该计算机程序用于实现本申请提供的方法中由网络设备执行的操作和/或处理。
本申请还提供一种计算机可读存储介质，该计算机可读存储介质中存储有计算机代码，当计算机代码在计算机上运行时，使得计算机执行本申请提供的方法中由UE执行的操作和/或处理。
本申请还提供一种计算机可读存储介质，该计算机可读存储介质中存储有计算机代码，当计算机代码在计算机上运行时，使得计算机执行本申请提供的方法中由网络设备执行的操作和/或处理。
本申请还提供一种计算机程序产品，该计算机程序产品包括计算机代码或计算机程序，当该计算机代码或计算机程序在计算机上运行时，使得本申请提供的方法中由UE执行的操作和/或处理被执行。
本申请还提供一种计算机程序产品，该计算机程序产品包括计算机代码或计算机程序，当该计算机代码或计算机程序在计算机上运行时，使得本申请提供的方法中由网络设备执行的操作和/或处理被执行。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另外，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口、装置或单元的间接耦合或通信连接，也可以是电的，机械的或其它的形式连接。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本申请实施例提供的方案的技术效果。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以是两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分，或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个可读存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的可读存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (25)

  1. 一种卫星通信方法，其特征在于，所述方法包括：
    接收广播消息，所述广播消息包括指示信息，所述指示信息用于指示一个系统信息SI窗口中包括Nw个子窗口，所述Nw个子窗口中的每个子窗口对应一个SI消息，所述Nw个SI消息中至少有一个SI消息包括星历信息，所述Nw为大于或等于2的整数；
    基于所述广播消息检测所述Nw个SI消息。
  2. 根据权利要求1所述的方法，其特征在于，所述每个子窗口中的检测时机MO对应于所述SI窗口中每M个系统帧SF中的一组MO，所述M为大于或等于2的整数。
  3. 根据权利要求2所述的方法，其特征在于，所述每M个SF包括第一组MO，所述第一组MO满足如下至少一项条件：所述第一组MO中的MO对应同一个SF；所述第一组MO中的MO对应至少两个SF。
  4. 根据权利要求3所述的方法，其特征在于，所述第一组MO包括由偶数索引的SF中与SIB19对应的MO。
  5. 根据权利要求1-4任一项所述的方法，其特征在于，所述每个子窗口中的MO索引是从所述SI窗口中每M个SF中提取一组MO，再按照升序编号确定的。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，所述方法还包括：
    接收同步信号块SSB，所述SSB的索引为K，与所述SSB对应的所述子窗口内的MO索引i满足如下条件：
    i＝x*N+K
    其中，x＝0,1,…,X-1，X＝ceil(S/N)，所述S表示所述子窗口中的MO的总数量，所述N表示所述SI窗口内的SSB总数量。
  7. 根据权利要求6所述的方法，其特征在于，所述SSB的周期等于所述SI窗口的窗长。
  8. 根据权利要求2-7任一项所述的方法，其特征在于，所述M的取值根据所述SSB的图样确定。
  9. 根据权利要求1-8任一项所述的方法，其特征在于，所述广播消息还包括如下至少一项信息：
    所述SI窗口的时频资源、所述Nw个子窗口中每个子窗口对应的SI消息的索引、每个SI消息对应的系统信息块SIB。
  10. 一种卫星通信方法，其特征在于，所述方法包括：
    确定一个系统信息SI窗口，所述IS窗口包括Nw个子窗口；
    发送广播消息，所述广播消息包括指示信息，所述指示信息用于指示一个SI窗口包括所述Nw个子窗口，所述Nw个子窗口中的每个子窗口对应一个SI消息，所述Nw个SI消息中至少有一个SI消息包括星历信息，所述Nw为大于或等于2的整数。
  11. 根据权利要求10所述的方法，其特征在于，所述每个子窗口中的检测时机MO对应于所述SI窗口中每M个系统帧SF中的一组MO，所述M为大于或等于2的整数。
  12. 根据权利要求11所述的方法，其特征在于，所述每M个SF包括第一组MO，所述第一组MO满足如下至少一项条件：所述第一组MO中的MO对应同一个SF；所述第一组MO中的MO对应至少两个SF。
  13. 根据权利要求12所述的方法，其特征在于，所述第一组MO包括由偶数索引的SF中与SIB19对应的MO。
  14. 根据权利要求10-13任一项所述的方法，其特征在于，所述每个子窗口中的MO索引是从所述SI窗口中每M个SF中提取一组MO，再按照升序编号确定的。
  15. 根据权利要求10-14任一项所述的方法，其特征在于，所述方法还包括：
    发送同步信号块SSB，所述SSB的索引为K，与所述SSB对应的所述子窗口内的MO索引i满足如下条件：
    i＝x*N+K
    其中，x＝0,1,…,X-1，X＝ceil(S/N)，所述S表示所述子窗口中的MO的总数量，所述N表示所述SI窗口内的SSB总数量。
  16. 根据权利要求15所述的方法，其特征在于，所述SSB的周期等于所述SI窗口的窗长。
  17. 根据权利要求11-16任一项所述的方法，其特征在于，所述M的取值根据所述SSB的图样确定。
  18. 根据权利要求10-17任一项所述的方法，其特征在于，所述广播消息还包括如下至少一项信息：
    所述SI窗口的时频资源、所述Nw个子窗口中每个子窗口对应的SI消息的索引、每个SI消息对应的 系统信息块SIB。
  19. 根据权利要求10-18任一项所述的方法，其特征在于，所述Nw基于所述SI窗口中MO的总数量和所述SI窗口中的同步信号块SSB的总数量确定。
  20. 根据权利要求10-19任一项所述的方法，其特征在于，所述Nw小于或等于Nmax，所述Nmax满足如下条件：
    其中，所述SMO表示所述SI窗口中的MO的总数量，所述N表示所述SI窗口中的同步信号块SSB的总数量。
  21. 一种通信装置，其特征在于，包括用于执行权利要求1-20任一项所述方法的单元。
  22. 一种通信装置，其特征在于，包括处理器和存储器；
    所述处理器用于存储计算机程序；
    所述处理器用于执行所述计算机程序，以使权利要求1-20任一项所述的方法被执行。
  23. 一种通信装置，其特征在于，包括逻辑电路和接口，所述逻辑电路和所述接口耦合；所述接口，用于输入和/或输出信息，所述逻辑电路，用于执行如权利要求1-20任一项所述的方法。
  24. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质用于存储计算机程序，当所述计算机程序被执行时，权利要求1-20任一项所述的方法被执行。
  25. 一种通信系统，其特征在于，所述通信系统包括终端设备和网络设备，所述终端设备用于执行如权利要求1-9任一项所述的方法，所述网络设备用于执行如权利要求10-20任一项所述的方法。
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CN113038618A (zh) * 2021-05-20 2021-06-25 银河航天(北京)网络技术有限公司 卫星通信系统及卫星通信系统接入的方法

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