WO2025035250A1 - Procédé et appareil de transmission de prach, et procédé et appareil de réception de prach - Google Patents

Procédé et appareil de transmission de prach, et procédé et appareil de réception de prach Download PDF

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Publication number
WO2025035250A1
WO2025035250A1 PCT/CN2023/112506 CN2023112506W WO2025035250A1 WO 2025035250 A1 WO2025035250 A1 WO 2025035250A1 CN 2023112506 W CN2023112506 W CN 2023112506W WO 2025035250 A1 WO2025035250 A1 WO 2025035250A1
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WIPO (PCT)
Prior art keywords
prach
group
period
ssb
opportunity
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PCT/CN2023/112506
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English (en)
Chinese (zh)
Inventor
田妍
蒋琴艳
张磊
卢艺文
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Fujitsu Ltd
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Fujitsu Ltd
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Priority to PCT/CN2023/112506 priority Critical patent/WO2025035250A1/fr
Publication of WO2025035250A1 publication Critical patent/WO2025035250A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the embodiments of the present application relate to the field of communication technologies.
  • NR Rel-18 studies the enhancement of the power of physical random access channel (PRACH) transmitted by terminal equipment (UE) through multiple physical random access channel transmission (multiple PRACH transmission), so that network equipment can receive PRACH sent by terminal equipment in the area with weaker coverage, thereby improving the coverage of the initial access channel and ensuring that terminal equipment at the edge of the cell can access the cell, thereby improving the coverage capability of the system.
  • PRACH physical random access channel
  • PRACH resource configuration scheme relevant PRACH resource information will be configured in the system information, including rach-ConfigCommon and additionalRACH-ConfigList-r17.
  • the network equipment configures PRACH frequency domain resources, PRACH configuration index and other PRACH resource information through radio resource control (RRC, Radio Resource Control) signaling.
  • RRC Radio Resource Control
  • the terminal device can obtain PRACH opportunity (RO) and other time-frequency resource related information through the PRACH configuration index and other lookup tables.
  • RO PRACH opportunity
  • SSB synchronization signal block
  • the association period SSB-to-RO association period
  • SSB-to-RO association pattern period SSB-to-RO association pattern period
  • the RO resources of the PRACH are determined within the SSB-to-RO association pattern period and are repeated at a later time.
  • the SSB-to-RO association pattern period includes one or more SSB-to-RO association periods, wherein the SSB-to-RO association period is determined by mapping between the SSB and the RO, and the RO to which the SSB is not mapped in the SSB-to-RO association period cannot be used for PRACH transmission.
  • the preamble needs to be repeatedly sent on at least multiple ROs in the time domain.
  • the SSB-to-RO group mapping method is introduced. If the SSB-to-RO association pattern period determination method is used, since the SSB-to-RO mapping method is changed to the SSB-to-RO group mapping method, the RO that is not mapped with SSB in the association period cannot be used to determine the RO group, resulting in a waste of RO resources.
  • an embodiment of the present application provides a PRACH sending and receiving method and device.
  • a PRACH sending method including:
  • the terminal device determines a second number of PRACH opportunities (RO) associated with a time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern;
  • RO PRACH opportunities
  • SSB synchronization signal block
  • the terminal device repeatedly sends a preamble on the second number of ROs.
  • a PRACH sending device which is configured in a terminal device, and the device includes:
  • a processing unit that determines a second number of PRACH opportunities (RO) associated with a time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern;
  • RO PRACH opportunities
  • SSB synchronization signal block
  • a sending unit is configured to repeatedly send a preamble on the second number of ROs.
  • a PRACH receiving method including:
  • the network device receives the preamble repeatedly sent by the terminal device on the second number of ROs
  • the terminal device determines the second number of PRACH opportunities (RO) associated with the time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • SSB synchronization signal block
  • a PRACH receiving device which is configured in a network device, and the device includes:
  • a receiving unit wherein a receiving terminal device repeatedly sends a preamble on a second number of ROs
  • the terminal device determines the second number of PRACH opportunities (RO) associated with the time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • SSB synchronization signal block
  • a communication system including:
  • a terminal device which determines the second number of PRACH opportunities (RO) associated with the time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern;
  • SSB synchronization signal block
  • a network device receives a preamble that is repeatedly sent by the terminal device on a second number of ROs.
  • the terminal device determines a second number of ROs related to a time period, the time period includes a first number of first periods, the PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunity (RO) or PRACH opportunity group (RO group) in the first period forms a repeated pattern.
  • the terminal device can quickly obtain RO resources sent by multiple PRACHs, and ensure that all SSBs in multiple PRACH transmissions are mapped to ROs, which not only improves the coverage capability of the system, but also improves the utilization rate of RO resources.
  • FIG1 is a schematic diagram of a communication system according to an embodiment of the present application.
  • FIG2 is a schematic diagram of a PRACH sending method according to an embodiment of the present application.
  • FIG3 is an example diagram of a time period according to an embodiment of the present application.
  • FIG4 is another example diagram of a time period according to an embodiment of the present application.
  • FIG5 is another example diagram of a time period according to an embodiment of the present application.
  • FIG6 is another example diagram of a time period according to an embodiment of the present application.
  • FIG7 is another example diagram of a time period according to an embodiment of the present application.
  • FIG8 is another example diagram of a time period according to an embodiment of the present application.
  • FIG9 is another example diagram of a time period according to an embodiment of the present application.
  • FIG10 is another example diagram of a time period according to an embodiment of the present application.
  • FIG11 is another example diagram of a time period according to an embodiment of the present application.
  • FIG12 is another example diagram of a time period according to an embodiment of the present application.
  • FIG13 is another example diagram of a time period according to an embodiment of the present application.
  • FIG14 is another example diagram of a time period according to an embodiment of the present application.
  • FIG15 is another example diagram of a time period according to an embodiment of the present application.
  • FIG16 is another example diagram of a time period according to an embodiment of the present application.
  • FIG17 is another example diagram of a time period according to an embodiment of the present application.
  • FIG18 is another example diagram of a time period according to an embodiment of the present application.
  • FIG19 is another example diagram of a time period according to an embodiment of the present application.
  • FIG20 is another example diagram of a time period according to an embodiment of the present application.
  • FIG21 is another example diagram of a time period according to an embodiment of the present application.
  • FIG22 is another example diagram of a time period according to an embodiment of the present application.
  • FIG23 is another example diagram of a time period according to an embodiment of the present application.
  • FIG24 is another example diagram of a time period according to an embodiment of the present application.
  • FIG25 is another example diagram of a time period according to an embodiment of the present application.
  • FIG26 is another example diagram of a time period according to an embodiment of the present application.
  • FIG27 is another example diagram of a time period according to an embodiment of the present application.
  • FIG28 is another example diagram of a time period according to an embodiment of the present application.
  • FIG29 is another example diagram of a time period according to an embodiment of the present application.
  • FIG30 is another example diagram of a time period according to an embodiment of the present application.
  • FIG31 is another example diagram of a time period according to an embodiment of the present application.
  • FIG32 is an example diagram of SSB-to-RO group mapping according to an embodiment of the present application.
  • FIG33 is another example diagram of SSB-to-RO group mapping according to an embodiment of the present application.
  • FIG34 is another example diagram of a time period according to an embodiment of the present application.
  • FIG35 is another example diagram of a time period according to an embodiment of the present application.
  • FIG36 is another example diagram of a time period according to an embodiment of the present application.
  • FIG37 is another example diagram of a time period according to an embodiment of the present application.
  • FIG38 is another example diagram of a time period according to an embodiment of the present application.
  • FIG39 is an example diagram of a PRACH configuration according to an embodiment of the present application.
  • FIG40 is a schematic diagram of a PRACH receiving method according to an embodiment of the present application.
  • FIG41 is a schematic diagram of a PRACH transmitting apparatus according to an embodiment of the present application.
  • FIG42 is a schematic diagram of a PRACH receiving device according to an embodiment of the present application.
  • FIG43 is a schematic diagram of a network device according to an embodiment of the present application.
  • Figure 44 is a schematic diagram of a terminal device according to an embodiment of the present application.
  • the terms “first”, “second”, etc. are used to distinguish different elements in terms of title, but do not indicate the spatial arrangement or temporal order of these elements, etc., and these elements should not be limited by these terms.
  • the term “and/or” includes any one and all combinations of one or more of the associated listed terms.
  • the terms “comprising”, “including”, “having”, etc. refer to the presence of the stated features, elements, components or components, but do not exclude the presence or addition of one or more other features, elements, components or components.
  • the term “communication network” or “wireless communication network” may refer to a network that complies with any of the following communication standards, such as Long Term Evolution (LTE), enhanced Long Term Evolution (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed Packet Access (HSPA), and the like.
  • LTE Long Term Evolution
  • LTE-A enhanced Long Term Evolution
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • communication between devices in the communication system may be carried out according to communication protocols of any stage, such as but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G, New Radio (NR), future 6G, etc., and/or other communication protocols currently known or to be developed in the future.
  • 1G generation
  • 2G 2.5G
  • 2.75G 3G
  • 4G 4G
  • 4.5G and 5G 3G
  • NR New Radio
  • future 6G etc.
  • communication protocols currently known or to be developed in the future.
  • the term "network device” refers to, for example, a device in a communication system that connects a terminal device to a communication network and provides services for the terminal device.
  • the network device may include, but is not limited to, the following devices: base station (BS), access point (AP), transmission reception point (TRP), broadcast transmitter, mobile management entity (MME), gateway, server, radio network controller (RNC), base station controller (BSC), etc.
  • base stations may include but are not limited to: Node B (NodeB or NB), evolved Node B (eNodeB or eNB) and 5G base station (gNB), IAB host, etc., and may also include remote radio heads (RRH, Remote Radio Head), remote radio units (RRU, Remote Radio Unit), relays or low-power nodes (such as femeto, pico, etc.).
  • NodeB Node B
  • eNodeB or eNB evolved Node B
  • gNB 5G base station
  • IAB host etc.
  • RRH Remote Radio Head
  • RRU Remote Radio Unit
  • relays or low-power nodes such as femeto, pico, etc.
  • base station may include some or all of their functions, and each base station can provide communication coverage for a specific geographical area.
  • the term "cell” can refer to a base station and/or its coverage area, depending on the context in which the term is used.
  • the term "user equipment” (UE) or “terminal equipment” (TE) refers to a device that accesses a communication network through a network device and receives network services.
  • the terminal device may be fixed or mobile, and may also be referred to as a mobile station (MS), a terminal, a subscriber station (SS), an access terminal (AT), a station, and the like.
  • the terminal device may include, but is not limited to, the following devices: cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, machine-type communication devices, laptop computers, cordless phones, smart phones, smart watches, digital cameras, etc.
  • PDAs personal digital assistants
  • wireless modems wireless communication devices
  • handheld devices machine-type communication devices
  • machine-type communication devices laptop computers
  • cordless phones smart phones
  • smart watches digital cameras
  • the terminal device can also be a machine or device for monitoring or measuring, such as but not limited to: machine type communication (MTC) terminal, vehicle-mounted communication terminal, device to device (D2D) terminal, machine to machine (M2M) terminal, and so on.
  • MTC machine type communication
  • D2D device to device
  • M2M machine to machine
  • network side refers to one side of the network, which may be a base station, or may include one or more network devices as above.
  • user side or “terminal side” or “terminal device side” refers to one side of the user or terminal, which may be a UE, or may include one or more terminal devices as above.
  • device may refer to either a network device or a terminal device.
  • FIG1 is a schematic diagram of a communication system according to an embodiment of the present application, schematically illustrating a situation taking a terminal device and a network device as an example.
  • a communication system 100 may include a network device 101 and terminal devices 102 and 103.
  • FIG1 only illustrates two terminal devices and one network device as an example, but the embodiment of the present application is not limited thereto.
  • existing services or future services can be sent between the network device 101 and the terminal devices 102 and 103.
  • these services may include but are not limited to: enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low-latency communication (URLLC), etc.
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communication
  • URLLC ultra-reliable and low-latency communication
  • FIG1 shows that both terminal devices 102 and 103 are within the coverage of the network device 101, but the present application is not limited thereto. Both terminal devices 102 and 103 may not be within the coverage of the network device 101, or one terminal device 102 is within the coverage of the network device 101 and the other terminal device 103 is outside the coverage of the network device 101.
  • the high-level signaling may be, for example, a radio resource control (RRC) signaling; for example, an RRC message (RRC message), including, for example, MIB, system information (system information), a dedicated RRC message; or an RRC IE (RRC information element).
  • RRC radio resource control
  • the high-level signaling may also be, for example, a MAC (Medium Access Control) signaling; or a MAC CE (MAC control element).
  • RRC radio resource control
  • the resources can predetermine the time domain pattern of SSB-RO mapping for sending PRACH and repeat the pattern in the time domain. According to the configuration of RO (PRACH occasion), the PRACH configuration period for PARCH transmission can be obtained.
  • a PRACH configuration period may drop some RO resources due to conflicts with SSB or downlink channels, and may not be able to map all SSBs. Therefore, for single PRACH transmission, the SSB-to-RO association period is defined to ensure that all SSB indexes are mapped at least once. However, the SSB-RO mapping pattern formed by the SSB-to-RO association period is not necessarily guaranteed to be repeated in the time domain, so the SSB-RO association pattern period is defined.
  • the preamble needs to be sent repeatedly on at least multiple ROs in the time domain. If the SSB-to-RO association pattern period determination method is used, since the SSB-to-RO mapping method is changed to the SSB-to-RO group mapping method, the RO that is not mapped with SSB in the association period cannot be used to determine the RO group, resulting in a waste of RO resources.
  • PRACH Physical random access channel
  • PDCH physical downlink control channel
  • PDSCH physical downlink data channel
  • sending (transmitting) or receiving (receiving) PRACH can be understood as sending or receiving random access information carried by PRACH
  • sending (transmitting) or receiving (receiving) PDCCH can be understood as sending or receiving downlink control information carried by PDCCH
  • sending or receiving PDSCH can be understood as sending or receiving downlink data carried by PDSCH.
  • the preamble can be called a random access preamble or a PRACH preamble.
  • FIG2 is a schematic diagram of the PRACH transmission method of the embodiment of the present application. As shown in FIG2, the method includes:
  • the terminal device determines a second number of PRACH opportunities (RO) associated with the time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO groups) in the first period form a repeated pattern;
  • RO PRACH opportunities
  • SSB synchronization signal block
  • the terminal device repeatedly sends a preamble on the second number of ROs.
  • FIG2 is only a schematic illustration of the embodiment of the present application, but the present application is not limited thereto.
  • the execution order between the various operations can be appropriately adjusted, and other operations can be added or some operations can be reduced.
  • Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description of the above FIG2.
  • the PRACH transmission targeted by the embodiments of the present application may be referred to as multiple PRACH transmissions, but is not limited thereto.
  • other names may also be used, such as MSG 1 repetion, PRACH repetition, multiple MSG 1 transmissions, etc.
  • the repetition number may also be referred to as the number of multiple PRACH transmissions.
  • valid ROs may follow the definition of valid RO in the 38.213 protocol, for example, ROs that do not conflict with SSB and whose time interval with SSB is not less than a threshold, and ROs that do not conflict/overlap with downlink time domain units in TDD configuration, etc.; the present application is not limited to this.
  • the time period X is, for example, in milliseconds (ms).
  • the first period is a PRACH opportunity group (RO group) association pattern period (GRAPP), and the time period includes a first number K of first periods, where the first number K is an integer greater than or equal to 1.
  • the first number may be a value configured and/or indicated by the network device, or the first number may be a default value or a fixed value, or the first number may be a value determined by the terminal device.
  • K can be directly configured and/or indicated by the network device through signaling, or it can be configured by the network device through other parameters, such as the number of SSB indexes in the cell, or it can be a default value or a fixed value, or it can be a value determined by the terminal device according to default rules.
  • the maximum value of the time period is T1, and/or the maximum value of the first period is T2.
  • the unit of the time period is, for example, milliseconds (ms), and the value of the first period is, for example, a multiple of a configuration period.
  • the second number N is the repetition number of PRACH transmission, and N is a positive integer greater than 1; the terminal device repeatedly transmits the preamble on N ROs, that is, the N ROs transmit the same preamble.
  • N ROs that transmit the same preamble can be called an RO group, that is, an RO group includes N ROs, where N is the repetition number of PRACH transmission.
  • a PRACH opportunity group maps at least a third number of synchronization signal block (SSB) indices.
  • the third number is a value configured and/or indicated by a network device, and the third number is greater than Or an integer equal to 1.
  • the third quantity is It can be obtained through ssb-PositionsInBurst in SIB1 or ServingCellConfigCommon. This application is not limited to this. It can also be obtained from other parameters. For specific content, please refer to related technologies.
  • the PRACH opportunity group (RO group) associated pattern period includes a second period of a fourth number L, and the fourth number L is an integer greater than or equal to 1; the fourth number is a value configured and/or indicated by the network device, or the fourth number is a default value or a fixed value, or the fourth number is a value determined by the terminal device.
  • L can be directly configured and/or indicated by the network device through signaling, or it can be configured by the network device through other parameters, such as the number of SSB indexes in the cell, or it can be a default value or a fixed value, or it can be a value determined by the terminal device according to default rules.
  • L is the minimum number of RO group association periods that can map all SSB indexes and form an SSB-to-RO group mapping pattern.
  • L is the minimum number of RO group association periods that can map all SSB indexes.
  • the PRACH opportunities (RO) or PRACH opportunity groups (RO groups) in the first cycle form a repeated pattern.
  • the time-frequency resource positions of the RO groups in any first cycle and another first cycle are the same, and such RO groups form a repeated pattern; the present application is not limited thereto.
  • the following is an example of a first period being a PRACH opportunity group (RO group) association pattern period (RGAPP) and a second period being a PRACH opportunity group (RO group) association period (RGAP), but the present application is not limited thereto.
  • RGAPP PRACH opportunity group association pattern period
  • RO group PRACH opportunity group association period
  • the PRACH opportunity group (RO group) association period is determined at least according to a PRACH configuration period.
  • At least one RO group can also be equivalent to "there are at least a second number of ROs constituting the RO group”.
  • the fourth number is the minimum number of PRACH opportunity group (RO group) association periods that map the third number of synchronization signal block (SSB) indices and form an SSB to PRACH opportunity group (RO group) mapping pattern.
  • RO group PRACH opportunity group
  • the PRACH opportunity There is at least one PRACH opportunity group (RO group) in the group (RO group) association period.
  • the RO group association period starts from system frame 0.
  • the RO group association period is determined according to the configuration period, and at least one RO group can be determined within one association period.
  • the number of PRACH configuration periods (configuration period) included in the PRACH opportunity group (RO group) association period is a value in a candidate value set, and the number is the minimum value in the candidate value set to ensure that at least one PRACH opportunity group (RO group) is determined in the PRACH opportunity group (RO group) association period.
  • the number of PRACH configuration periods (configuration period) included in the PRACH opportunity group (RO group) association period is a predefined value, or a value configured/indicated by a network device.
  • the RO group association period is determined according to the PRACH configuration period, including but not limited to the following methods:
  • the number of configuration periods included in the RO group association period is in the candidate value set, and it is guaranteed that at least one RO group can be determined within the RO group association period;
  • the number of configuration periods included in the RO group association period is a predefined value or is determined by a default rule, for example, the number of configuration periods included in the RO group association period is N (the value of number of multiple PRACH transmissions), or the number of configuration periods included in the RO group association period is the minimum value that allows the RO group association period to contain at least one RO group;
  • the number of configuration periods included in the RO group association period is the value configured by the gNB.
  • the SSB index is not mapped on the PRACH opportunity (RO) or PRACH transmission is not performed on the PRACH opportunity (RO).
  • the RO(s) in the set will not map the SSB index or will not send PRACH transmissions on the RO.
  • other ROs are, for example, ROs that cannot form an RO group with a repetition number of N.
  • N ROs can form an RO group, and multiple ROs within the time period can form an integer number of ROs. After the group, one or more ROs may remain. If these ROs cannot form an RO group, the SSB index is not mapped on these ROs or the PRACH is not sent on these ROs.
  • the PRACH transmissions not performed on the PRACH opportunity (RO) include at least multiple PRACH transmissions.
  • the ROs are at least not used for multiple PRACH transmissions and can be used for single PRACH transmissions.
  • the following example illustrates how to determine the RO group association period.
  • Fig. 3 is an example diagram of the time period of the embodiment of the present application.
  • the PRACH configuration period is 10ms, there is one PRACH slot in each subframe, and there is one PRACH occasion in each PRACH slot, so there are 10 ROs in each system frame.
  • the ROs in the 160ms radio frames numbered 0 to 15 are shown in Figure 3.
  • the number of ROs in the PRACH configuration period containing SSB is 0. Since the SSB period is 40ms, there are SSB bursts in the radio frames numbered 0, 4, 8, and 12, so there are 0 ROs in these frames.
  • the value of RGAP can be ⁇ 1, 2, 4, 8, 16 ⁇ PRACH configuration periods, and the actual value of RGAP is the minimum value in the candidate value set that the ROs in RGAP can at least guarantee to form an RO group.
  • the RO(s) in the set will not map the SSB index or will not send PRACH transmissions on the RO. Therefore, after forming an RO group in each RGAP in Figure 4, the remaining 2 ROs cannot form an RO group, and will no longer map the SSB index or will not be used for PRACH transmissions. Therefore, the number of ROs that form an RO group in one RGAP is 8.
  • the number of configuration periods included in the RO group association period is a predefined value, such as 8 (the maximum configurable repetition number value).
  • Fig. 5 is another example diagram of the time period of an embodiment of the present application. As shown in Fig. 5, for example, if the PRACH configuration is used for multiple PRACH transmission with a repetition number of 8, the RGAP consists of 8 PRACH configuration periods.
  • the RO(s) in the set will not map the SSB index or will not send PRACH transmissions on the RO. Therefore, after forming an RO group in each RGAP in Figure 5, the remaining 4 ROs cannot form an RO group, and will no longer map the SSB index or will not be used for PRACH transmissions. Therefore, the number of ROs in an RO group in an RGAP is 56 (7*8), forming an integer number (7) of RO groups.
  • the number of configuration periods included in the RO group association period is the number configured by the gNB.
  • the number of configuration periods included in the RO group association period is directly configured by the gNB, or the gNB configures it from a set of candidate values.
  • FIG6 is another example diagram of the time period of an embodiment of the present application.
  • the PRACH configuration is used for multiple PRACH transmission with a repetition number of 4, and the gNB directly configures the number of PRACH configuration periods included in the RGAP to be 2.
  • the RO(s) in the set will not be mapped to the SSB index. Or do not send PRACH transmissions on the RO. Therefore, after the 8 ROs in RGAP 0, 2, 4, 6 in Figure 6 form 2 RO groups, the remaining 2 ROs can no longer form an RO group, so these 2 ROs are dropped.
  • the number of valid ROs in RGAP 1, 3, 5, 7 is 20, and these ROs can form RO groups, so no ROs are dropped.
  • the number of configuration periods included in the RO group association period can be obtained through other parameters configured by the gNB, for example, equal to the repetition number configured by the gNB.
  • the configured repetition number may be the repetition number of multiple PRACH transmissions configured in a certain PRACH configuration or feature combination, or it may be the maximum repetition number of multiple PRACH transmissions configured with different repetition numbers. For details, please refer to the following embodiments.
  • Fig. 7 is another example diagram of the time period of an embodiment of the present application. As shown in Fig. 7, for example, if the PRACH configuration is used for multiple PRACH transmission with a repetition number of 4, the RGAP consists of 4 PRACH configuration periods.
  • the RO(s) in the set will not map the SSB index or will not send PRACH transmissions on the RO. Therefore, after forming an RO group in each RGAP in FIG7 , the remaining 2 ROs cannot form an RO group, and will no longer map the SSB index or will not be used for PRACH transmissions. Therefore, the number of ROs in an RO group in an RGAP is 28 (7*4), forming an integer number (7) of RO groups.
  • a RO group association pattern period contains L RO group association periods, where L ⁇ 1 and is an integer.
  • the RO groups in the RO group association pattern period can map all SSB indexes at least once, and the ROs/RO groups in the RO group association pattern period can determine a repeatable SSB-to-RO group pattern.
  • the L value configured for the gNB can ensure that the RGAPP maps all SSB indexes at least once, and the ROs/RO groups within the RO group association pattern period can determine a repeatable SSB-to-RO group pattern.
  • FIG8 is another example diagram of the time period of the embodiment of the present application.
  • an RO group association pattern period requires at least 8 groups.
  • This PRACH configuration is used for multiple PRACH transmission with a repetition number of 8.
  • RGAPs 0 to 7 can map all 8 SSB indices, but cannot form a SSB-to-RO group mapping cycle pattern.
  • RGAPs 0 to 8 can form a repeatable pattern, so RGAPP contains 9 RGAPs.
  • the SSB index is not mapped on the PRACH opportunity (RO) or PRACH transmission is not performed on the PRACH opportunity (RO).
  • a fifth number of SSB indexes are mapped on the PRACH opportunities (RO), the fifth number is less than the third number, and the fifth number is an integer greater than or equal to 1.
  • the fifth number of SSB indexes are the first M SSB indexes among the third number of SSB indexes, or, are the last M SSB indexes among the third number of SSB indexes, or, are random M SSB indexes among the third number of SSB indexes, where M is an integer greater than or equal to 1.
  • Fig. 9 is another example diagram of the time period of the embodiment of the present application. As shown in Fig. 9, the RO group in RGAP 8 is used to map a certain SSB index (represented by SSB#N) in the SSB index.
  • SSB#N SSB index
  • FIG. 10 is another example diagram of the time period of an embodiment of the present application.
  • the PRACH configuration is used for multiple PRACH transmission with a repetition number of 8.
  • RGAP 0 can map all 7 SSB indexes, but does not map all SSBs and cannot form a SSB-to-RO group mapping cycle pattern.
  • RGAP 0 to 1 can form a repeatable pattern. Therefore, RGAPP contains 2 RGAPs.
  • FIG11 is another example diagram of the time period of an embodiment of the present application. As shown in FIG11, the remaining The RO group can be used to map one of the 6 SSB indexes in the SSB index.
  • FIG. 12 is another example diagram of the time cycle of an embodiment of the present application.
  • the PRACH configuration is used for multiple PRACH transmission with a repetition number of 4, RGAP 0 to 2 can map all 8 SSB indexes, and 3 RGAPs cannot form a SSB-to-RO group mapping cycle pattern.
  • RGAP 0 to 3 a total of 4 RGAPs, can form a repeatable pattern. Therefore, RGAPP contains 4 RGAPs.
  • Fig. 13 is another example diagram of the time period of the embodiment of the present application. As shown in Fig. 13, the remaining RO groups in RGAP 2-3 can be used to map 6 SSB indexes in the SSB index.
  • FIG14 is another example diagram of the time cycle of the embodiment of the present application.
  • the PRACH configuration is used for multiple PRACH transmission with a repetition number of 4
  • RGAP 0 can map 7 SSBs 0 to 6
  • the 4 ROs in RGAP 1 that map SSB 7 can completely map the SSB indexes
  • RGAP 0 to 1 can form a SSB-to-RO group mapping cycle pattern. Therefore, RGAPP contains 2 RGAPs.
  • Fig. 15 is another example diagram of the time period of the embodiment of the present application. As shown in Fig. 15, the remaining RO groups in RGAP 1 can be used to map 6 SSB indexes in the SSB index.
  • the first period is determined at least based on a multiple of the least common multiple of a PRACH configuration period and an SSB burst period, and the multiple is an integer greater than or equal to 1.
  • the PRACH configuration period is P1
  • the SSB burst period is P2
  • P is the least common multiple of P1 and P2.
  • RGAPP L*P.
  • L is directly configured by the gNB, or the minimum value in the candidate value set configured by the gNB; for another example, L is the minimum value among the candidate values; for another example, L is the minimum value that can form the SSB-to-RO group mapping pattern.
  • the method of determining the RO group association pattern period is exemplified below. That is, the PRACH configuration is used for multiple PRACH transmission with a repetition number of 8, and the SSB burst period is 40 ms, the PRACH configuration period is 10 ms, and the valid ROs pattern after determining the RO group association period is shown in FIG4 .
  • a "RO group association pattern period” contains L “RO group association period (RGAP)", where L ⁇ 1 and is an integer.
  • RGAPP is a multiple of the least common multiple of all SSB indices mapped at least once and the PRACH configuration period and the SSB burst period.
  • the ROs/RO groups within the RO group association pattern period can determine a repeatable SSB-to-RO group pattern.
  • FIG16 is another example diagram of the time period of an embodiment of the present application.
  • L is a value directly configured by the gNB, or a value in a set of candidate values configured by the gNB. If the number of SSB indexes is 8. For the RGAP example in FIG4 , the SSB burst period is 40ms, the PRACH configuration period is 10ms, and the least common multiple of the two is 40ms, then RGAPP needs to be a multiple of 40ms and can form a SSB-to-RO group mapping cycle pattern. As shown in FIG16 , the gNB directly configures L to 9, which can satisfy that RGAPP is an SSB-to-RO group mapping pattern and is a multiple of 40ms.
  • Fig. 17 is another example diagram of the time period of the embodiment of the present application. As shown in Fig. 17, the RO group in RGAP 8 can also be used to map a certain SSB index in the SSB index.
  • L is the minimum value that can form an SSB-to-RO group mapping pattern. If the number of SSB indexes is 8. For the RGAP example in Figure 4, the SSB burst period is 40ms, the PRACH configuration period is 10ms, and the least common multiple of the two is 40ms, then RGAPP needs to be a multiple of 40ms and can form a SSB-to-RO group mapping cycle pattern. Then L is at least 9, which can satisfy that RGAPP is an SSB-to-RO group mapping pattern and is a multiple of 40ms.
  • the first period is at least based on a PRACH configuration period A multiple of a maximum value in an SSB burst period is determined, the multiple being an integer greater than or equal to 1.
  • the PRACH configuration period is P1
  • RGAPP L*P.
  • L is a value directly configured by the gNB or a value in a candidate value set configured by the gNB; for another example, L is the minimum value among the candidate values; for another example, L is the minimum value that can form an SSB-to-RO group mapping pattern.
  • a "RO group association pattern period” contains L “RO group association period (RGAP)", where L ⁇ 1 and is an integer.
  • RGAPP is a multiple of the maximum value of all SSB indices mapped at least once and in the PRACH configuration period and SSB burst period.
  • the ROs/RO groups within the RO group association pattern period can determine a repeatable SSB-to-RO group pattern.
  • FIG18 is another example diagram of the time period of an embodiment of the present application.
  • L is a value directly configured by the gNB, or a value in a set of candidate values configured by the gNB. If the number of SSB indexes is 4. For the RGAP example in FIG4 , the SSB burst period is 40ms, the PRACH configuration period is 10ms, and the maximum value of the two is 40ms, then the RGAPP needs to be a multiple of 40ms and can form a SSB-to-RO group mapping cycle pattern. As shown in FIG18 , the gNB can directly configure L to 6, which can satisfy that the RGAPP is an SSB-to-RO group mapping pattern and is a multiple of 40ms.
  • FIG19 is another example diagram of the time period of an embodiment of the present application. As shown in FIG19 , 16 ROs in RGAP 4-5 can also be used to map two SSB indexes in the SSB index.
  • L is the minimum value that can form an SSB-to-RO group mapping pattern. If the number of SSB indexes is 4. For the RGAP example in Figure 4, the SSB burst period is 40ms, the PRACH configuration period is 10ms, and the maximum of the two is 40ms, then RGAPP needs to be a multiple of 40ms and can form a SSB-to-RO group mapping cycle pattern. Then L is at least 6, which can satisfy that RGAPP is an SSB-to-RO group mapping pattern and is a multiple of 40ms.
  • the first period is determined at least according to a multiple of a predetermined value (160 ms), where the multiple is an integer greater than or equal to 1.
  • RO group association pattern period is L times of 160 ms.
  • L is a value directly configured by the gNB, or a value in a candidate value set configured by the gNB; for another example, L is a minimum value among the candidate values; for another example, L is a minimum value that can form an SSB-to-RO group mapping pattern.
  • a "RO group association pattern period” contains L “RO group association period (RGAP)", where L ⁇ 1 and is an integer.
  • RGAPP is a multiple of 160ms that maps all SSB indices at least once.
  • the ROs/RO groups within the RO group association pattern period can determine a repeatable SSB-to-RO group pattern.
  • FIG20 is another example diagram of the time period of an embodiment of the present application.
  • L is a value directly configured by the gNB, or a value in a candidate value set configured by the gNB. If the number of SSB indexes is 8.
  • RGAPP needs to be a multiple of 160ms and can form a SSB-to-RO group mapping cycle pattern.
  • the gNB directly configures L to 12, which can satisfy that RGAPP is an SSB-to-RO group mapping pattern and is 160ms.
  • ROs in RGAP 8 to 11 cannot map all SSB indexes once, so ROs in RGAP 8 to 11 are not used to map SSB index or are not used for PRACH transmissions.
  • FIG21 is another example diagram of the time period of an embodiment of the present application. As shown in FIG21, ROs in RGAP 8 to 11 can also be used to map four SSB indices in the SSB index.
  • FIG22 is another example diagram of the time cycle of an embodiment of the present application.
  • L is the minimum value that can form an SSB-to-RO group mapping pattern. If the number of SSB indexes is 4.
  • RGAPP needs to be a multiple of 160ms and can form a pattern of an SSB-to-RO group mapping cycle.
  • L is at least 12, which can satisfy that RGAPP is an SSB-to-RO group mapping pattern and is 160ms.
  • the above description is based on the case where the configuration of PRACH is msg1-FDM is 1, but the present application is not limited thereto.
  • the following description further describes the case where the third number of SSB indexes in the PRACH opportunity group (RO group) association period is mapped to the PRACH opportunity group (RO group) at least once.
  • the fourth number is the minimum number of PRACH opportunity group (RO group) association periods that map the third number of SSB indices.
  • the third number of SSB indexes are mapped to the PRACH opportunity group (RO group) at least once within a period associated with the PRACH opportunity group (RO group).
  • a RO group association period starts from system frame 0 and is determined according to PRACH configuration periods, so that all SSB indices are mapped to RO groups at least once.
  • the number of PRACH configuration periods (configuration period) included in the PRACH opportunity group (RO group) association period is a value in a candidate value set, and the number is the minimum value in the candidate value set that ensures that the third number of SSB indexes are mapped to the PRACH opportunity group (RO group) at least once in the PRACH opportunity group (RO group) association period.
  • the number of PRACH configuration periods (configuration period) included in the PRACH opportunity group (RO group) association period is a predefined value, or a value configured/indicated by a network device.
  • the RO group association period is determined according to the PRACH configuration period, including but not limited to the following methods:
  • the number of PRACH configuration periods included in the RO group association period is the minimum value in the candidate value set, and it can be guaranteed that at least all SSB indexes can be mapped to RO groups within the RO group association period;
  • the number of configuration periods included in the RO group association period is a predefined value or a value determined by the default rule, for example, the number of configuration periods included in the RO group association period is 8 or a default value (a positive integer), or the number of configuration periods included in the RO group association period is the minimum value that can ensure that at least all SSB indexes in the RO group association period can be mapped to RO groups;
  • the number of configuration periods included in the RO group association period is the value configured by the gNB.
  • the SSB index is not mapped on the PRACH opportunity (RO) or PRACH transmission is not performed on the PRACH opportunity (RO).
  • the ROs set no longer maps the SSB index or is not used for PRACH transmissions.
  • the PRACH transmissions not performed on the PRACH opportunity (RO) include at least multiple PRACH transmissions.
  • the ROs are at least not used for multiple PRACH transmissions and can be used for single PRACH transmissions.
  • the following example illustrates how to determine the RO group association period.
  • FIG. 23 is another example diagram of the time period of an embodiment of the present application.
  • the PRACH configuration period is 10 ms, and the even frame and odd frame contain 8 and 6 valid ROs respectively.
  • the SSB period is 80 ms, and the number of ROs in the PRACH configuration period containing SSB is 0.
  • FIG. 23 shows the ROs in the 160 ms radio frames numbered 0 to 15.
  • the number of PRACH configuration periods included in the RO group association period is the minimum value in the candidate value set, and it can be guaranteed that at least all SSB indexes in the RO group association period can be mapped to the RO groups once.
  • the mapping relationship between the RO group association period and the PRACH configuration period is shown in Table 2 below.
  • the value of RGAP can be ⁇ 1, 2, 4, 8, 16, 32 ⁇ PRACH configuration period, and the actual value of RGAP is the minimum value in the candidate value set of all SSB indexes that can be mapped by the RO groups within the RGAP.
  • FIG. 24 is another example diagram of the time period of an embodiment of the present application.
  • the PRACH Configuration is used for multiple PRACH transmission with repetition number 8 and SSB index number 8, which can determine the valid ROs pattern after RO group association period.
  • 8 RO groups consisting of ROs in system frames 0 to 10 and 2 ROs in system frame 11 can map all 8 SSB indices.
  • RGAP needs to be the minimum value among ⁇ 1,2,4,8,16,32 ⁇ PRACH configuration periods, so RGAP is 16 PRACH configuration periods.
  • the remaining ROs set cannot form a SSB index and RO groups mapping cycle, then the ROs set no longer maps SSB index or is not used for PRACH transmissions. Therefore, after the ROs that map all SSB indexes are determined in the RGAP in Figure 24, the remaining 4 ROs in system frame 11 and the ROs in system frames 12 to 15 cannot form a RO group and SSB index mapping cycle, then these ROs no longer map SSB index or are not used for PRACH transmissions.
  • FIG25 is another example diagram of the time period of an embodiment of the present application.
  • the PRACH configuration is used for multiple PRACH transmissions with a repetition number of 4 and the number of SSB indices is 8, the valid ROs pattern after the RO group association period can be determined.
  • the ROs of system frames 0 to 4 and the 8 RO groups composed of 4 ROs in system frame 5 can map all 8 SSB indices.
  • the RGAP needs to be the minimum value among ⁇ 1, 2, 4, 8, 16, 32 ⁇ PRACH configuration periods, and the RGAP is 8 PRACH configuration periods.
  • the ROs set cannot form a SSB index and RO groups mapping cycle, then the ROs set no longer maps SSB index or is not used for PRACH transmissions. Therefore, after the ROs that map all SSB indexes are determined in RGAP 0 in Figure 25, the remaining 2 ROs in system frame 5 and the ROs in system frames 6 to 7 cannot form a RO group and SSB index mapping cycle, then these ROs no longer map SSB index or are not used for PRACH transmissions.
  • the number of configuration periods included in the RO group association period is a predefined value or a value determined by a default rule.
  • the number of configuration periods included in the RO group association period is a default value of 8 or another value (a positive integer), or the number of configuration periods included in the RO group association period is a minimum value that can ensure that at least all SSB indexes in the RO group association period can be mapped to RO groups.
  • FIG. 26 is another example diagram of the time period of an embodiment of the present application. As shown in FIG. 26, if the PRACH The configuration is used for multiple PRACH transmission with a repetition number of 8 and a number of SSB indices of 8.
  • the RGAP is predefined to consist of 16 PRACH configuration periods.
  • the ROs set cannot form a SSB index and RO groups mapping cycle, then the ROs set no longer maps SSB index or is not used for PRACH transmissions. Therefore, after the RGAP in Figure 26 determines the ROs that have mapped all SSB indexes, the remaining 4 ROs in system frame 11 and the ROs in system frames 12 to 15 cannot form a RO group and SSB index mapping cycle, then these ROs no longer map SSB index or are not used for PRACH transmissions.
  • FIG27 is another example diagram of the time period of an embodiment of the present application.
  • the number of PRACH configuration periods in the RGAP is the minimum value that can ensure that at least all SSB indexes in the RO group association period can be mapped to RO groups.
  • RGAP 0,1 contains at least 6 PRACH configuration periods, which can ensure that all SSB indexes can be mapped to RO groups.
  • the number of configuration periods included in the RO group association period is a number configured by the gNB.
  • the number of configuration periods included in the RO group association period is directly configured by the gNB, or the gNB configures it from a set of candidate values.
  • FIG28 is another example diagram of the time period of an embodiment of the present application.
  • the PRACH configuration is used for multiple PRACH transmission with a repetition number of 4, and the gNB directly configures the number of PRACH configuration periods included in the RGAP to be 8.
  • the ROs set no longer maps the SSB index or is not used for PRACH transmissions.
  • the remaining two ROs in system frame 5 and the ROs in system frames 6 to 7 cannot form an RO group and SSB index mapping cycle, so these ROs no longer map SSB index or are not used for PRACH transmissions.
  • a RO group association pattern period contains L RO group association periods, where L ⁇ 1 and is an integer.
  • the RO groups in the RO group association pattern period can map all SSB indexes at least once, and the ROs/RO groups in the RO group association pattern period can determine a repeatable SSB-to-RO group pattern.
  • this PRACH configuration is used for multiple PRACH transmission with a repetition number of 4 and an SSB index of 8, and the valid ROs pattern after the RO group association period can be determined.
  • FIG29 is another example diagram of the time period of the embodiment of the present application.
  • an RGAPP contains an RGAP, which can ensure that the ROs/RO groups within the RO group association pattern period determine a repeatable SSB-to-RO group pattern.
  • the "RO group association pattern period" can be determined according to multiples of the least common multiple of the PRACH configuration period and the SSB burst period, or according to multiples of the maximum value of the PRACH configuration period and the SSB burst period, or according to multiples of 160ms.
  • the PRACH configuration period is 10ms
  • the SSB burst period is 80ms
  • the PRACH configuration period is 10ms
  • the numbers of valid ROs in even frames and odd frames are 8 and 6 respectively
  • the valid ROs pattern is shown in Figure 23.
  • a "RO group association pattern period” contains L “RO group association period (RGAP)", where L ⁇ 1 and is an integer.
  • RGAPP is a multiple of the least common multiple of all SSB indices mapped at least once and the PRACH configuration period and the SSB burst period.
  • the ROs/RO groups within the RO group association pattern period can determine a repeatable SSB-to-RO group pattern.
  • This PRACH configuration is used for multiple PRACH transmission with a repetition number of 8 and an SSB index of 8.
  • FIG30 is another example diagram of the time period of an embodiment of the present application.
  • the PRACH configuration period is 10 ms
  • the SSB burst period is 80 ms
  • the least common multiple of the two is 80 ms.
  • RGAPP needs to be a multiple of 80 ms and can form a SSB-to-RO group mapping cycle pattern.
  • the gNB directly configures L to 1, which can satisfy that RGAPP is a SSB-to-RO group mapping pattern and is a multiple of 80 ms.
  • FIG31 is another example diagram of the time period of the embodiment of the present application.
  • the SSB burst period is 80 ms
  • the PRACH configuration period is 10 ms
  • the least common multiple of the two is 80 ms.
  • RGAPP needs to be a multiple of 80 ms and can form a SSB-to-RO group mapping cycle pattern.
  • L is at least 1, which can satisfy that RGAPP is a SSB-to-RO group mapping pattern and is a multiple of 80 ms.
  • a "RO group association pattern period” contains L “RO group association period (RGAP)", where L ⁇ 1 and is an integer.
  • RGAPP is a multiple of the maximum value of all SSB indices mapped at least once and in the PRACH configuration period and SSB burst period.
  • the ROs/RO groups within the RO group association pattern period can determine a repeatable SSB-to-RO group pattern.
  • the gNB directly configures it, or the gNB configures a value in the candidate value set. If the PRACH configuration is used for multiple PRACH transmission with a repetition number of 8 and the SSB index number is 8.
  • the SSB burst period is 80ms
  • the PRACH configuration period is 10ms
  • the maximum of the two is 80ms. Therefore, RGAPP needs to be a multiple of 80ms and can form a SSB-to-RO group mapping cycle pattern.
  • the gNB directly configures L to 1, which can satisfy RGAPP as a SSB-to-RO group mapping pattern and a multiple of 80ms.
  • the SSB burst period is 80ms and the PRACH configuration period is 10ms.
  • the maximum of the two is 80ms. Therefore, RGAPP needs to be a multiple of 80ms and can form an SSB-to-RO group.
  • the minimum value of L is 1, which satisfies that RGAPP is a SSB-to-RO group mapping pattern and is a multiple of 80ms.
  • a "RO group association pattern period” contains L “RO group association period (RGAP)", where L ⁇ 1 and is an integer.
  • RGAPP is a multiple of 160ms that maps all SSB indexes at least once.
  • the ROs/RO groups within the RO group association pattern period can determine a repeatable SSB-to-RO group pattern.
  • L is a value directly configured by the gNB, or a value in a set of candidate values configured by the gNB; for another example, L is the minimum value that can form an SSB-to-RO group mapping pattern.
  • the PRACH opportunity group (RO group) is a second number N PRACH opportunities (RO) having adjacent time domain resources and the same frequency domain resources.
  • an RO group is N ROs that are close in time domain, and N is the repetition number of multiple PRACH transmissions to which the PRACH configuration applies.
  • N ROs that are adjacent in time domain means that the N ROs in the RO group are ROs with the closest time domain resource intervals, or the time domain resource indexes of the ROs are continuous.
  • the same frequency domain resources can also mean the same frequency domain resource index.
  • mapping order of SSB index to PRACH opportunity group includes:
  • RO groups frequency domain multiplexed PRACH opportunity groups
  • ROs PRACH opportunities
  • RO group For a PRACH opportunity group (RO group) or PRACH opportunity (RO) multiplexed in the time domain, they are mapped in the increasing order of the time domain resource index within the PRACH time slot;
  • the PRACH time slots are mapped in increasing order of index.
  • FIG32 is an example diagram of SSB-to-RO group mapping according to an embodiment of the present application. As shown in FIG32 , when the repetition number is 4, SSB0 is mapped to RO group 0, SSB1 is mapped to RO group 1, ..., SSB7 is mapped to RO group 7.
  • FIG. 33 is an example diagram of SSB-to-RO group mapping according to an embodiment of the present application.
  • the repetition number is 2, SSB0 is mapped to RO group 0, SSB1 is mapped to RO group 1, ..., SSB7 is mapped to RO group 7.
  • FIG3 to FIG31 are described by taking the case where msg1-FDM is 1 as an example, and exemplarily showing the case where the number of resources in the frequency domain is 1, but the present application is not limited thereto.
  • PRACH configuration periods are 10ms, and the SSB burst period is 80ms.
  • RGAP can contain ⁇ 1,2,4,8,16 ⁇ PRACH configuration periods.
  • the composed pattern is shown in Figure 34, and 160ms is an association pattern period.
  • PRACH configuration periods is 10ms
  • SSB burst period is 80ms.
  • RGAP can contain ⁇ 1,2,4,8,16 ⁇ PRACH configuration periods.
  • repetition number is 4, the pattern is as shown in Figure 35.
  • 160ms can form an RGAPP, and the ROs of the last two RGAPs can no longer form an SSB-to-RO group mapping cycle and are no longer used for PRACH transmission.
  • FIG36 is another example diagram of the time period of an embodiment of the present application. As shown in FIG36, the ROs of the last two RGAPs can no longer form an SSB-to-RO group mapping cycle, and 4 more SSBs can be mapped for multiple PRACH transmission.
  • the PRACH configuration period is 10ms and the SSB burst period is 80ms.
  • the RGAP may include ⁇ 1, 2, 4, 8, 16 ⁇ PRACH configuration periods.
  • the pattern is as shown in FIG37.
  • PRACH configuration periods is 10ms
  • SSB burst period is 80ms.
  • RGAP can contain ⁇ 1,2,4,8,16 ⁇ PRACH configuration periods.
  • repetition number is 4, the pattern is as shown in Figure 38.
  • the PRACH resource configuration of the embodiment of the present application is further described below, and the time period X can be determined based on these configurations.
  • the time period is determined according to the maximum value of the number of repetitions of PRACH transmission in all PRACH configurations.
  • the time period is determined according to the maximum value of the different numbers of repetitions corresponding to all the feature combinations;
  • the time period is determined according to the maximum value of the different numbers of repetitions corresponding to the one feature.
  • Figure 39 is an example diagram of the PRACH configuration of an embodiment of the present application.
  • the PRACH configuration may include BWP-UplinkCommon, AdditionalRACH-Config, rach-ConfigCommon, featureCombinationPreambles, etc.
  • BWP-UplinkCommon AdditionalRACH-Config
  • rach-ConfigCommon featureCombinationPreambles
  • one K value or multiple K values may be determined, that is, one time period X or multiple time periods X.
  • Multiple PRACH applicable to different AdditionalRACH-Configs in BWP-UplinkCommon transmission, repetition number may be different.
  • all featureCombinationPreambles in rach-ConfigCommon in the AdditionalRACH-Config may determine one K value or multiple K values, that is, one time period X or multiple time periods X.
  • the features or feature combinations of different featureCombinationPreambles in rach-ConfigCommon may be applicable to different multiple PRACH transmissions and repetition numbers.
  • a featureCombinationPreambles in rach-ConfigCommon in the AdditionalRACH-Config can determine one K value or multiple K values, that is, one time period X or multiple time period X.
  • the feature combination of a featureCombinationPreambles is multiple PRACH transmission with different repetition numbers.
  • the terminal device can quickly obtain RO resources for sending multiple PRACH transmissions and ensure the sending of multiple PRACH transmissions, thereby not only improving the coverage capability of the system but also improving the utilization rate of RO resources.
  • different methods for determining the repetition period of the SSB and RO group mapping patterns may be used, or the same method for determining the repetition period of the SSB and RO group mapping patterns may be used.
  • determining the RO group association period through the RO group can maximize the use of RO resources for multiple PRACH transmissions, thereby improving the resource utilization of PRACH transmission. Determining the RO group association period through SSB-to-RO group mapping can reduce the workload of standardization.
  • the terminal device determines a second number of ROs associated with a time period, wherein the time period includes a first number of first periods, and the PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunity (RO) or PRACH opportunity group (RO group) in the first period forms a repeated pattern.
  • the terminal device can quickly obtain the RO resources sent by multiple PRACHs, and ensure that all SSBs in the multiple PRACH transmissions are mapped to RO not only improves the coverage capability of the system, but also improves the utilization rate of RO resources.
  • the embodiment of the present application provides a PRACH receiving method, which is described from the perspective of a network device.
  • the embodiment of the second aspect can be combined with the embodiment of the first aspect, and the same contents as those of the embodiment of the first aspect will not be repeated.
  • FIG. 40 is a schematic diagram of a PRACH receiving method according to an embodiment of the present application. As shown in FIG. 40 , the method includes:
  • the network device receives a preamble repeatedly sent by the terminal device on a second number of ROs;
  • the terminal device determines the second number of PRACH opportunities (RO) associated with the time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • SSB synchronization signal block
  • the method may further include:
  • the network device sends PRACH configuration information and/or indication information to the terminal device.
  • FIG. 40 is only a schematic illustration of the embodiment of the present application, but the present application is not limited thereto.
  • the execution order between the various operations can be appropriately adjusted, and other operations can be added or some operations can be reduced.
  • Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the records of the above FIG. 40.
  • the first period is a PRACH opportunity group (RO group) associated pattern period (GRAPP)
  • the second number is the repetition number of the PRACH transmission, and the second number is an integer greater than 1
  • the third number is a value configured and/or indicated by the network device, and the third number is an integer greater than or equal to 1.
  • the PRACH opportunity group (RO group) association pattern period includes a fourth number of second periods, and the fourth number is an integer greater than or equal to 1;
  • the fourth number is a value configured and/or indicated by the network device, or the fourth number is a default value or a fixed value, or the fourth number is a value determined by the terminal device.
  • the second period is a PRACH opportunity group (RO group) association period (RGAP), and the PRACH opportunity group (RO group) association period is determined at least according to a PRACH configuration period.
  • RO group PRACH opportunity group
  • RGAP PRACH opportunity group association period
  • the fourth number is the minimum number of PRACH opportunity group (RO group) association periods that map the third number of synchronization signal block (SSB) indices and form an SSB to PRACH opportunity group (RO group) mapping pattern.
  • RO group PRACH opportunity group
  • PRACH opportunity group for PRACH transmissions with a second number of repetitions, there is at least one PRACH opportunity group (RO group) in the PRACH opportunity group (RO group) association period.
  • the SSB index is not mapped on the PRACH opportunity (RO) or PRACH transmission is not performed on the PRACH opportunity (RO).
  • the PRACH transmission not performed on the PRACH opportunity (RO) includes at least multiple PRACH transmissions.
  • the number of PRACH configuration periods (configuration period) included in the PRACH opportunity group (RO group) association period is a value in a candidate value set, and the number is the minimum value in the candidate value set to ensure that at least one PRACH opportunity group (RO group) is determined in the PRACH opportunity group (RO group) association period.
  • the number of PRACH configuration periods (configuration period) included in the PRACH opportunity group (RO group) association period is a predefined value, or a value configured/indicated by a network device.
  • the fourth number is the minimum number of PRACH opportunity group (RO group) association periods that map the third number of SSB indices.
  • the third number of SSB indexes are mapped to the PRACH opportunity group (RO group) at least once within a period associated with the PRACH opportunity group (RO group).
  • the SSB index is not mapped on the PRACH opportunity (RO) or PRACH transmission is not performed on the PRACH opportunity (RO).
  • the PRACH transmission not performed on the PRACH opportunity (RO) includes at least multiple PRACH transmissions.
  • the PRACH opportunity group (RO group) associated period includes the PRACH
  • the number of configuration periods is a value in a candidate value set, and the number is a minimum value in the candidate value set that ensures that the third number of SSB indexes are mapped to the PRACH opportunity group (RO group) at least once in the PRACH opportunity group (RO group) association period.
  • the number of PRACH configuration periods (configuration period) included in the PRACH opportunity group (RO group) association period is a predefined value, or a value configured/indicated by a network device.
  • the time period is determined according to the maximum value of the number of repetitions of PRACH transmission in all PRACH configurations.
  • the time period is determined according to the maximum value of the different numbers of repetitions corresponding to all the feature combinations;
  • the time period is determined according to the maximum value of the different numbers of repetitions corresponding to the one feature.
  • the first period is determined at least based on a multiple of the least common multiple of a PRACH configuration period and an SSB burst period, and the multiple is an integer greater than or equal to 1.
  • the first period is determined at least based on a multiple of a maximum value of a PRACH configuration period and an SSB burst period, and the multiple is an integer greater than or equal to 1.
  • the first period is determined at least according to a multiple of a predetermined value (160 ms), where the multiple is an integer greater than or equal to 1.
  • the first number is a value configured and/or indicated by a network device, or the first number is a default value or a fixed value, or the first number is a value determined by the terminal device, and the first number is an integer greater than or equal to 1.
  • the maximum value of the time period is T1, and/or the maximum value of the first period is T2.
  • the SSB index is not mapped on the PRACH opportunity (RO) or PRACH transmission is not performed on the PRACH opportunity (RO).
  • a fifth number of SSB indexes are mapped on the PRACH opportunities (RO), the fifth number is less than the third number, and the fifth number is an integer greater than or equal to 1.
  • the fifth number of SSB indexes are the first M SSB indexes of the third number of SSB indexes, or, are the last M SSB indexes of the third number of SSB indexes, or, are random M SSB indexes of the third number of SSB indexes, where M is an integer greater than or equal to 1.
  • the PRACH opportunity group (RO group) is a second number N PRACH opportunities (RO) having adjacent time domain resources and the same frequency domain resources.
  • mapping order of SSB index to PRACH opportunity group includes:
  • RO groups frequency domain multiplexed PRACH opportunity groups
  • ROs PRACH opportunities
  • RO group For a PRACH opportunity group (RO group) or PRACH opportunity (RO) multiplexed in the time domain, they are mapped in the increasing order of the time domain resource index within the PRACH time slot;
  • the PRACH time slots are mapped in increasing order of index.
  • the terminal device determines a second number of ROs associated with a time period, wherein the time period includes a first number of first periods, and the PRACH opportunity groups (RO groups) in the first period are at least A third number of synchronization signal block (SSB) indexes are mapped, and the PRACH opportunities (RO) or PRACH opportunity groups (RO groups) in the first cycle form a repeated pattern.
  • the terminal device can quickly obtain the RO resources sent by multiple PRACHs, and ensure that all SSBs in the multiple PRACH transmissions are mapped to the ROs, which not only improves the coverage capability of the system, but also improves the utilization rate of the RO resources.
  • the embodiment of the present application provides a PRACH sending device.
  • the device may be, for example, a terminal device, or may be one or more components or assemblies configured in the terminal device, and the contents that are the same as those in the embodiment of the first aspect are not repeated here.
  • FIG41 is a schematic diagram of a PRACH transmitting device according to an embodiment of the present application.
  • a PRACH transmitting device 4100 includes:
  • a processing unit 4101 which determines a second number of PRACH opportunities (RO) associated with a time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern;
  • the time period includes a first number of first periods
  • a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern;
  • SSB synchronization signal block
  • the sending unit 4102 is configured to repeatedly send a preamble on the second number of ROs.
  • the PRACH transmitting apparatus 4100 may further include:
  • the receiving unit 4103 receives PRACH configuration information and/or indication information sent by the network device.
  • the PRACH transmitting device 4100 may also include other components or modules, and the specific contents of these components or modules may refer to the relevant technology.
  • FIG. 41 only exemplifies the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used.
  • the above-mentioned various components or modules can be implemented by hardware facilities such as processors, memories, transmitters, and receivers; the implementation of this application is not limited to this.
  • the terminal device determines a second number of ROs associated with a time period, the time period includes a first number of first periods, the PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunity (RO) or PRACH opportunity group (RO group) in the first period forms a repeated pattern.
  • the terminal device can quickly Obtaining RO resources for multi-PRACH transmission and ensuring that all SSBs in multi-PRACH transmission are mapped to RO not only improves the coverage capability of the system, but also improves the utilization rate of RO resources.
  • the embodiment of the present application provides a PRACH receiving device.
  • the device may be, for example, a network device, or may be one or more components or assemblies configured in the network device, and the contents that are the same as those in the first and second aspects of the embodiments are not repeated here.
  • FIG42 is a schematic diagram of a PRACH receiving device according to an embodiment of the present application.
  • a PRACH receiving device 4200 includes:
  • a receiving unit 4201 which receives a preamble repeatedly sent by a terminal device on a second number of ROs
  • the terminal device determines the second number of PRACH opportunities (RO) associated with the time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • SSB synchronization signal block
  • the PRACH receiving apparatus 4200 may further include:
  • the sending unit 4202 sends PRACH configuration information and/or indication information to the terminal device.
  • the PRACH receiving device 4200 may also include other components or modules, and the specific contents of these components or modules may refer to the relevant technology.
  • FIG. 42 only exemplifies the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used.
  • the above-mentioned components or modules can be implemented by hardware facilities such as processors, memories, transmitters, and receivers; the implementation of this application is not limited to this.
  • the terminal device determines a second number of ROs associated with a time period, the time period includes a first number of first periods, the PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunity (RO) or PRACH opportunity group (RO group) in the first period forms a repeated pattern.
  • the terminal device can quickly obtain RO resources sent by multiple PRACHs, and ensure that all SSBs in multiple PRACH transmissions are mapped to ROs, which not only improves the coverage capability of the system, but also improves the utilization rate of RO resources.
  • An embodiment of the present application also provides a communication system, and reference may be made to FIG1 .
  • the contents that are the same as those in the first to fourth embodiments will not be repeated herein.
  • the communication system 100 may include at least:
  • a terminal device which determines the second number of PRACH opportunities (RO) associated with the time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern;
  • SSB synchronization signal block
  • a network device receives a preamble that is repeatedly sent by the terminal device on a second number of ROs.
  • An embodiment of the present application further provides a network device, which may be, for example, a base station, but the present application is not limited thereto and may also be other network devices.
  • a network device which may be, for example, a base station, but the present application is not limited thereto and may also be other network devices.
  • FIG43 is a schematic diagram of the composition of a network device according to an embodiment of the present application.
  • the network device 4300 may include: a processor 4310 (e.g., a central processing unit CPU) and a memory 4320; the memory 4320 is coupled to the processor 4310.
  • the memory 4320 may store various data; in addition, it may store a program 4330 for information processing, and the program 4330 may be executed under the control of the processor 4310.
  • the processor 4310 may be configured to execute a program to implement the PRACH receiving method as described in the embodiment of the second aspect.
  • the processor 4310 may be configured to perform the following control: the receiving terminal device repeatedly sends a preamble on a second number of ROs;
  • the terminal device determines the second number of PRACH opportunities (RO) associated with the time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • SSB synchronization signal block
  • the network device 4300 may also include: a transceiver 4340 and an antenna 4350, etc.; wherein the functions of the above components are similar to those of the prior art and are not described in detail here. It is worth noting that the network device 4300 does not necessarily include all the components shown in FIG43; in addition, the network device 4300 may also include components not shown in FIG43, which may refer to the prior art.
  • the embodiment of the present application also provides a terminal device, but the present application is not limited thereto and may also be other devices.
  • FIG44 is a schematic diagram of a terminal device according to an embodiment of the present application.
  • the terminal device 4400 can The system may include a processor 4410 and a memory 4420; the memory 4420 stores data and programs and is coupled to the processor 4410. It should be noted that this figure is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunication functions or other functions.
  • the processor 4410 may be configured to execute a program to implement the PRACH transmission method as described in the embodiment of the first aspect.
  • the processor 4410 may be configured to perform the following control: determining a second number of PRACH opportunities (RO) associated with a time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern; and repeatedly transmitting a preamble on the second number of ROs.
  • RO PRACH opportunities
  • the terminal device 4400 may further include: a communication module 4430, an input unit 4440, a display 4450, and a power supply 4460.
  • the functions of the above components are similar to those of the prior art and are not described in detail here. It is worth noting that the terminal device 4400 does not necessarily include all the components shown in FIG44 , and the above components are not necessary; in addition, the terminal device 4400 may also include components not shown in FIG44 , and reference may be made to the prior art.
  • An embodiment of the present application also provides a computer program, wherein when the program is executed in a terminal device, the program enables the terminal device to execute the PRACH sending method described in the embodiment of the first aspect.
  • An embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program enables a terminal device to execute the PRACH sending method described in the embodiment of the first aspect.
  • An embodiment of the present application also provides a computer program, wherein when the program is executed in a network device, the program enables the network device to execute the PRACH reception method described in the embodiment of the second aspect.
  • An embodiment of the present application also provides a storage medium storing a computer program, wherein the computer program enables a network device to execute the PRACH reception method described in the embodiment of the second aspect.
  • the above devices and methods of the present application can be implemented by hardware, or by hardware combined with software.
  • the present application relates to such a computer-readable program, which, when executed by a logic component, enables the logic component to implement the above-mentioned devices or components, or enables the logic component to implement the various methods or steps described above.
  • the present application also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.
  • the method/device described in conjunction with the embodiments of the present application may be directly embodied as hardware, a software module executed by a processor, or a combination of the two.
  • one or more of the functional block diagrams shown in the figure and/or one or more combinations of the functional block diagrams may correspond to various software modules of the computer program flow, or may correspond to various hardware modules. Blocks. These software modules may correspond to the various steps shown in the figure respectively.
  • These hardware modules may be implemented by solidifying these software modules using, for example, a field programmable gate array (FPGA).
  • FPGA field programmable gate array
  • the software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • a storage medium may be coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium; or the storage medium may be an integral part of the processor.
  • the processor and the storage medium may be located in an ASIC.
  • the software module may be stored in a memory of a mobile terminal or in a memory card that can be inserted into the mobile terminal.
  • the software module may be stored in the MEGA-SIM card or the large-capacity flash memory device.
  • the functional blocks described in the drawings and/or one or more combinations of functional blocks it can be implemented as a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component or any appropriate combination thereof for performing the functions described in the present application.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field programmable gate array
  • it can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.
  • a PRACH sending method comprising:
  • the terminal device determines a second number of PRACH opportunities (RO) associated with a time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern;
  • RO PRACH opportunities
  • SSB synchronization signal block
  • the terminal device repeatedly sends a preamble on the second number of ROs.
  • the first period is a PRACH opportunity group (RO group) Associated pattern period (GRAPP)
  • the second number is the repetition number (repetition number) sent by the PRACH, and the second number is an integer greater than 1
  • the third number is a value configured and/or indicated by the network device, and the third number is an integer greater than or equal to 1.
  • the PRACH opportunity group (RO group) association pattern period includes a fourth number of second periods, and the fourth number is an integer greater than or equal to 1;
  • the fourth number is a value configured and/or indicated by the network device, or the fourth number is a default value or a fixed value, or the fourth number is a value determined by the terminal device.
  • the second period is a PRACH opportunity group (RO group) association period (RGAP), and the PRACH opportunity group (RO group) association period is determined at least according to a PRACH configuration period (configuration period).
  • RO group PRACH opportunity group
  • configuration period PRACH configuration period
  • the fourth number is the minimum number of PRACH opportunity group (RO group) association cycles that map the third number of synchronization signal block (SSB) indices and form an SSB to PRACH opportunity group (RO group) mapping pattern.
  • the PRACH transmission not performed on the PRACH opportunity (RO) includes at least multiple PRACH transmission (multiple PRACH transmission).
  • the number of PRACH configuration periods (configuration period) included in the PRACH opportunity group (RO group) association period is a value in a candidate value set, and the number is the minimum value in the candidate value set that ensures that at least one PRACH opportunity group (RO group) is determined in the PRACH opportunity group (RO group) association period.
  • the PRACH transmission not performed on the PRACH opportunity (RO) includes at least multiple PRACH transmission (multiple PRACH transmission).
  • the number of PRACH configuration periods (configuration period) included in the PRACH opportunity group (RO group) association period is a value in a candidate value set, and the number is the minimum value in the candidate value set that ensures that the third number of SSB indexes are mapped to the PRACH opportunity group (RO group) at least once in the PRACH opportunity group (RO group) association period.
  • a method according to any one of Notes 11 to 14, wherein the number of PRACH configuration periods (configuration period) included in the PRACH opportunity group (RO group) association period is a predefined value, or a value configured/indicated by a network device.
  • the time period is determined according to the maximum value of the number of repetitions of PRACH transmission in all PRACH configurations.
  • the time period is determined according to the maximum value of the different numbers of repetitions corresponding to all the feature combinations;
  • a PRACH configuration with PRACH transmission For a feature or feature combination in the uplink common configuration, a PRACH configuration with PRACH transmission, and One of the characteristics corresponds to a PRACH transmission with different repetition numbers, and the time period is determined according to the maximum value of the different repetition numbers corresponding to the one characteristic.
  • the first period is determined at least based on a multiple of the least common multiple of a PRACH configuration period and an SSB burst period, and the multiple is an integer greater than or equal to 1.
  • the first period is determined at least based on a multiple of a maximum value of a PRACH configuration period and an SSB burst period, and the multiple is an integer greater than or equal to 1.
  • the first number is a value configured and/or indicated by the network device, or the first number is a default value or a fixed value, or the first number is a value determined by the terminal device, and the first number is an integer greater than or equal to 1.
  • the fifth number of SSB indexes are the first M SSB indexes among the third number of SSB indexes, or the last M SSB indexes among the third number of SSB indexes, or random M SSB indexes among the third number of SSB indexes, where M is an integer greater than or equal to 1.
  • the PRACH opportunity group is a second number N of PRACH opportunities (RO) having adjacent time domain resources and the same frequency domain resources.
  • mapping order of SSB index to PRACH opportunity group includes:
  • RO groups frequency domain multiplexed PRACH opportunity groups
  • ROs PRACH opportunities
  • RO group For a PRACH opportunity group (RO group) or PRACH opportunity (RO) multiplexed in the time domain, they are mapped in the increasing order of the time domain resource index within the PRACH time slot;
  • the PRACH time slots are mapped in increasing order of index.
  • a PRACH receiving method comprising:
  • the network device receives the preamble repeatedly sent by the terminal device on the second number of ROs
  • the terminal device determines the second number of PRACH opportunities (RO) associated with the time period; wherein the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • the time period includes a first number of first periods, a PRACH opportunity group (RO group) in the first period maps at least a third number of synchronization signal block (SSB) indexes, and the PRACH opportunities (RO) or PRACH opportunity groups (RO group) in the first period form a repeated pattern.
  • SSB synchronization signal block
  • the first period is a PRACH opportunity group (RO group) associated pattern period (GRAPP)
  • the second number is the repetition number of the PRACH transmission, and the second number is an integer greater than 1
  • the third number is a value configured and/or indicated by a network device, and the third number is an integer greater than or equal to 1.
  • the PRACH opportunity group (RO group) association pattern period includes a fourth number of second periods, and the fourth number is an integer greater than or equal to 1;
  • the fourth number is a value configured and/or indicated by the network device, or the fourth number is a default value or a fixed value, or the fourth number is a value determined by the terminal device.
  • the second period is a PRACH opportunity group (RO group) association period (RGAP)
  • the PRACH opportunity group (RO group) association period is determined at least according to a PRACH configuration period (configuration period).
  • the fourth quantity is a synchronization that maps the third quantity
  • SSB signal block
  • the PRACH transmission not performed on the PRACH opportunity (RO) includes at least multiple PRACH transmission (multiple PRACH transmission).
  • a method according to any one of Notes 32 to 35, wherein the number of PRACH configuration periods (configuration period) included in the PRACH opportunity group (RO group) association period is a value in a candidate value set, and the number is the minimum value in the candidate value set that ensures that at least one PRACH opportunity group (RO group) is determined in the PRACH opportunity group (RO group) association period.
  • the fourth number is the minimum number of PRACH opportunity group (RO group) association periods mapping the third number of SSB indices.
  • the number of PRACH configuration periods (configuration period) included in the association period is a value in the candidate value set, and the number is the minimum value in the candidate value set that ensures that the third number of SSB indexes are mapped to the PRACH opportunity group (RO group) at least once in the PRACH opportunity group (RO group) association period.
  • the time period is determined according to the maximum value of the number of repetitions of PRACH transmission in all PRACH configurations.
  • the time period is determined according to the maximum value of the different numbers of repetitions corresponding to all the feature combinations;
  • the time period is determined according to the maximum value of the different numbers of repetitions corresponding to the one feature.
  • a method according to any one of Notes 28 to 44, wherein the first period is determined at least based on a multiple of the least common multiple of a PRACH configuration period and an SSB burst period, and the multiple is an integer greater than or equal to 1.
  • the first number is a value configured and/or indicated by the network device, or the first number is a default value or a fixed value, or the first number is a value determined by the terminal device, and the first number is an integer greater than or equal to 1.
  • the fifth number of SSB indexes are the first M SSB indexes among the third number of SSB indexes, or the last M SSB indexes among the third number of SSB indexes, or random M SSB indexes among the third number of SSB indexes, where M is an integer greater than or equal to 1.
  • the PRACH opportunity group (RO group) is a second number N PRACH opportunities (RO) having adjacent time domain resources and the same frequency domain resources.
  • mapping order of SSB index to PRACH opportunity group includes:
  • RO groups frequency domain multiplexed PRACH opportunity groups
  • ROs PRACH opportunities
  • RO group For a PRACH opportunity group (RO group) or PRACH opportunity (RO) multiplexed in the time domain, they are mapped in the increasing order of the time domain resource index within the PRACH time slot;
  • the PRACH time slots are mapped in increasing order of index.
  • a terminal device comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the PRACH sending method as described in any one of Notes 1 to 27.
  • a network device comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the PRACH reception method as described in any one of Notes 28 to 54.

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Abstract

Des modes de réalisation de la présente demande proposent un procédé et un appareil de transmission de PRACH, et un procédé et un appareil de réception de PRACH. Le procédé comprend les étapes suivantes : un équipement terminal détermine un second nombre d'occasions de PRACH (RO) associées à une période de temps, la période de temps comprenant un premier nombre de premières périodes, au moins un troisième nombre d'indices de bloc de signaux de synchronisation (SSB) étant mappés à des groupes d'occasions de PRACH (groupes de RO) dans chaque première période, et des RO ou des groupes de RO dans chaque première période formant un motif de répétition ; et l'équipement terminal transmet de manière répétée un préambule sur le second nombre de RO.
PCT/CN2023/112506 2023-08-11 2023-08-11 Procédé et appareil de transmission de prach, et procédé et appareil de réception de prach Pending WO2025035250A1 (fr)

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LG ELECTRONICS: "Initial access and mobility for NR-U", 3GPP DRAFT; R1-1912390, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Reno, USA; 20191118 - 20191122, 9 November 2019 (2019-11-09), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051823396 *

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