Multi-physical random access channel (prach) transmission method and apparatus

Abstract

The present disclosure provides a multi-PRACH transmission method and device, relates to the technical field of mobile communication, and provides a multi-PRACH transmission method according to an embodiment of the present disclosure. A terminal device performs each PRACH transmission in multi-PRACH transmission, and determines a preamble selected by each PRACH transmission. A network device receives PRACH transmission of the terminal device, the PRACH transmission is at least one PRACH transmission in multi-PRACH transmission sent by the terminal device, the same or different preambles are selected by each PRACH transmission, and the preambles are from the same or different preamble groups. The multi-PRACH transmission method and device provided by the present disclosure provide a solution for selecting preambles and groups in multi-PRACH transmission, and ensure normal and orderly transmission of multi-PRACH transmission.

Description

Technical Field

[0001] This disclosure relates to the field of mobile communication technology, and in particular to a multi-PRACH transmission method and apparatus. Background Technology

[0002] With the continuous development of wireless communication, the requirements for communication capabilities are also increasing. One of the bottlenecks in uplink coverage is the Physical Random Access Channel (PRACH). To improve PRACH channel coverage, 3GPP Release 18 is preparing to develop a scheme based on multi-PRACH transmission. Although Release 18 has proposed the possibility of multi-PRACH transmission, how to implement multi-PRACH transmission remains an unsolved problem. Summary of the Invention

[0003] This disclosure provides a method and apparatus for multi-PRACH transmission, and provides a solution for multi-PRACH transmission preamble and group selection.

[0004] A first aspect of this disclosure provides a multi-PRACH transmission method applied to a terminal device. The method includes: performing each PRACH transmission in a multi-PRACH transmission, and determining a preamble to be used in each PRACH transmission, wherein the preamble comes from the same or different preamble groups.

[0005] In some embodiments of this disclosure, each PRACH transmission in a multi-PRACH transmission uses the same preamble, and each PRACH transmission selects the preamble selected by the first PRACH transmission in the single multi-PRACH transmission.

[0006] In some embodiments of this disclosure, the first X PRACH transmissions of the multi-PRACH transmission all use the first preamble selected by the first PRACH transmission in the multi-PRACH transmission, and each subsequent PRACH transmission from the (X+1)th PRACH transmission uses the second preamble selected by the (X+1)th PRACH transmission; wherein the first preamble and the second preamble are different.

[0007] In some embodiments of this disclosure, the X value is specified by a communication protocol, a system protocol, or a network device.

[0008] In some embodiments of this disclosure, each PRACH transmission in a single PRACH transmission uses its corresponding selected preamble.

[0009] In some embodiments of this disclosure, determining the preamble used for each PRACH transmission in a multi-PRACH transmission includes: receiving first indication information sent by a network device, wherein the first indication information is used to indicate the preamble used for each PRACH transmission in the multi-PRACH transmission.

[0010] In some embodiments of this disclosure, the method further includes at least one of the following steps: in response to determining, according to a communication protocol or the first indication information, that each PRACH transmission of the multi-PRACH transmission uses a different preamble, performing each PRACH transmission in the multi-PRACH transmission accordingly, wherein each PRACH transmission selects to use a different preamble; and in response to determining, according to a communication protocol or the first indication information, that each PRACH transmission of the multi-PRACH transmission is not allowed to use a different preamble, performing each PRACH transmission in the multi-PRACH transmission accordingly, wherein each PRACH transmission selects to use the same preamble.

[0011] In some embodiments of this disclosure, the process of performing multiple PRACH transmissions, wherein each PRACH transmission selects to use the same or different preamble, includes at least one of the following steps: in response to a multiple PRACH transmission on a first RO associated with a first SSB, each PRACH transmission of the multiple PRACH transmission on the first RO selects to use the preamble selected by the first PRACH transmission on the first SSB; in response to a multiple PRACH transmission switching from a first RO associated with a first SSB to a second RO associated with a second SSB, each PRACH transmission of the multiple PRACH transmission on the second RO selects to use a reselected preamble.

[0012] In some embodiments of this disclosure, the step of performing multiple PRACH transmissions, wherein each PRACH transmission selects a different preamble, includes: in response to a first RO transmission associated with a first SSB in a multiple PRACH transmission, the first X PRACH transmissions of the multiple PRACH transmission on the first RO all select the first preamble selected by the first PRACH transmission on the first SSB, and each subsequent PRACH transmission from the (X+1)th PRACH transmission uses a second preamble reselected by the (X+1)th PRACH transmission; wherein the first preamble and the second preamble are different.

[0013] In some embodiments of this disclosure, the X value is specified by a communication protocol, a system protocol, or a network device.

[0014] In some embodiments of this disclosure, the step of performing each PRACH transmission in a multi-PRACH transmission, wherein each PRACH transmission selects a different preamble, includes: in response to a first RO transmission associated with a first SSB during a multi-PRACH transmission, each PRACH transmission of the multi-PRACH transmission on the first RO uses its own reselected preamble.

[0015] In some embodiments of this disclosure, the method further includes: receiving second indication information issued by a network device, the second indication information being used to determine the preamble used by each PRACH transmission in a first RO transmission associated with a first SSB.

[0016] In some embodiments of this disclosure, the process of performing each PRACH transmission in a multi-PRACH transmission, wherein each PRACH transmission selects a different preamble, includes at least one of the following steps: in response to a second RO transmission of a multi-PRACH transmission at a first time domain location, each PRACH transmission of the multi-PRACH transmission on the second RO selects the same preamble; and in response to a multi-PRACH transmission switching from the second RO at the first time domain location to a third RO at a second time domain location, each PRACH transmission of the multi-PRACH transmission on the third RO selects a reselected preamble.

[0017] In some embodiments of this disclosure, the step of performing each PRACH transmission in a multi-PRACH transmission, wherein each PRACH transmission selects a different preamble, includes: in response to different RO transmissions at the same time-domain location in a multi-PRACH transmission, the first X PRACH transmissions of the multi-PRACH transmission at the different ROs all select the same first preamble, and each PRACH transmission from the (X+1)th PRACH transmission onwards uses a reselected second preamble; wherein the first preamble and the second preamble are different.

[0018] In some embodiments of this disclosure, the step of performing each PRACH transmission in a multi-PRACH transmission, wherein each PRACH transmission selects to use a different preamble, includes: in response to different RO transmissions of a multi-PRACH transmission at the same time-domain location, each PRACH transmission of the multi-PRACH transmission at the different ROs selects to use a reselected preamble.

[0019] In some embodiments of this disclosure, the step of performing each PRACH transmission in a multi-PRACH transmission, wherein each PRACH transmission selects to use a different preamble, includes at least one of the following steps: in response to a multi-PRACH transmission with different ROs at a first time-domain location within the same SSB, each PRACH transmission of the multi-PRACH transmission on the different ROs selects to use the same preamble; and in response to a multi-PRACH transmission switching from different ROs at a first time-domain location within the same SSB to different ROs at a first time-domain location, each PRACH transmission of the multi-PRACH transmission on the different ROs selects to use a reselected preamble.

[0020] In some embodiments of this disclosure, the method further includes: receiving third indication information sent by a network device, the third indication information being used to indicate whether different preambles are allowed for each PRACH transmission at a time-domain location in a multi-PRACH transmission.

[0021] In some embodiments of this disclosure, the method further includes: performing each PRACH transmission in a multi-PRACH transmission, selecting the first preamble to use from preamble Group A and / or preamble Group B for each PRACH transmission selection.

[0022] In some embodiments of this disclosure, the selection of the first preamble used for each PRACH transport selection from preamble Group A and / or preamble Group B includes:

[0023] In response to the RACH configuration of the multiple PRACH transmission including only the configuration of Group A, the first preamble is selected from Group A;

[0024] In response to the RACH configuration of the multiple PRACH transmission including only the configuration of Group B, the first preamble is selected from Group B;

[0025] In response to the configuration of Group A and Group B in the RACH configuration of the multiple PRACH transmission, the first preamble is selected from Group A and Group B;

[0026] In response to the configuration of Group A and Group B in the RACH configuration of the multi-PRACH transmission, it is determined whether the size of msg3 meets the threshold ra-Msg3SizeGroupA; if the threshold is met, the first preamble is selected from Group A; if the threshold is not met, the first preamble is selected from Group B.

[0027] In response to the RACH configuration of the multi-PRACH transmission sharing the RO with other RACH configurations, the first preamble is selected from Group A; and

[0028] In response to the RACH configuration of the multi-PRACH transmission sharing RO with other RACH configurations, and the other RACH configurations including the Group B configuration, the terminal device determines whether to select the first preamble from Group B or Group A according to the fourth indication issued by the network device. The fourth indication information is used to indicate whether the terminal device selects the first preamble from Group B.

[0029] In some embodiments of this disclosure, the method further includes: receiving the RACH configuration of the multi-PRACH transmission sent by the network device when the RACH configuration of the multi-PRACH transmission adopts separate RO with other RACH configurations, wherein the RACH configuration of the multi-PRACH transmission includes a Group B configuration.

[0030] In some embodiments of this disclosure, the method further includes: reselecting the preamble after the first preamble selection to obtain a reselected preamble, wherein the reselected preamble is selected from the Group group to which the first preamble is located, or from other Group groups other than the Group group to which the first preamble is located.

[0031] In some embodiments of this disclosure, the method further includes: receiving fifth indication information sent by a network device, the fifth indication information being used to determine whether the reselection of the preamble needs to be the same Group as the first preamble selection.

[0032] In some embodiments of this disclosure, the method further includes: in response to determining, based on the fifth indication information, that the reselection of the preamble needs to be the same Group as the first preamble selection, reselecting the preamble according to the rules of the first preamble selection Group.

[0033] In some embodiments of this disclosure, the method further includes: receiving the RACH configuration of the multi-PRACH transmission sent by the network device in response to the RACH configuration of the multi-PRACH transmission using separate RO with other RACH configurations, wherein the RACH configuration of the multi-PRACH transmission includes a Group B configuration.

[0034] In some embodiments of this disclosure, the method further includes: receiving the RACH configuration of the multi-PRACH transmission sent by the network device when the RACH configuration of the multi-PRACH transmission shares RO with other RACH configurations, wherein the RACH configuration of the multi-PRACH transmission includes a dedicated Group B configuration.

[0035] In some embodiments of this disclosure, the RACH configuration for dedicated multi-PRACH transmission includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, and numberOfRA-PreamblesGroupA.

[0036] In some embodiments of this disclosure, the method further includes: in response to the fact that the RACH configuration for the multiple PRACH transmission does not contain a dedicated ra-Msg3SizeGroupA, messagePowerOffsetGroupB, or numberOfRA-PreamblesGroupA, receiving the RACH configuration for the multiple PRACH transmission issued by the network device, wherein the RACH configuration for the multiple PRACH transmission is the corresponding configuration in the RACH configuration of the shared RO.

[0037] In some embodiments of this disclosure, the dedicated Group B is configured as a 4-step RA configuration or a 2-step RA configuration respectively.

[0038] A second aspect of this disclosure provides a multi-PRACH transmission method, the method being applied to a network device, comprising:

[0039] The terminal device receives random access PRACH transmissions, wherein the PRACH transmission is at least one of multiple PRACH transmissions sent by the terminal device; wherein the multiple PRACH transmissions include multiple PRACH transmissions, and each PRACH transmission selects to use the same or different preambles, and the preambles come from the same or different preamble groups.

[0040] In some embodiments of this disclosure, the method further includes: in response to determining that the terminal device is performing each PRACH transmission in a multi-PRACH transmission, sending first indication information to the terminal device, the first indication information being used to indicate the preamble used by each PRACH transmission in the multi-PRACH transmission.

[0041] In some embodiments of this disclosure, the method further includes: in response to each PRACH transmission in a first RO transmission associated with a first SSB, sending second indication information to the terminal device, the second indication information being used to indicate whether different preambles are allowed for each PRACH transmission in a first RO transmission associated with a first SSB.

[0042] In some embodiments of this disclosure, the method further includes: in response to each PRACH transmission at a time-domain location in a multi-PRACH transmission, sending third indication information to the terminal device, the third indication information being used to indicate whether different preambles are allowed for each PRACH transmission at a time-domain location in the multi-PRACH transmission.

[0043] In some embodiments of this disclosure, the method further includes: in response to a RACH configuration for multiple PRACH transmissions sharing an RO with other RACH configurations, and the other RACH configurations including a Group B configuration, sending a fourth indication message to the terminal device, the fourth indication message being used to indicate whether the reselection of the preamble needs to select the same Group as the first preamble selection.

[0044] In some embodiments of this disclosure, the method further includes: sending a fifth instruction message to the terminal device, the fifth instruction message being used to indicate whether the reselection of the preamble needs to be the same preamble group selected during the first preamble selection.

[0045] In some embodiments of this disclosure, the method further includes: in response to the RACH configuration of the multiple PRACH transmission using separate RO with other RACH configurations, sending the RACH configuration of the multiple PRACH transmission to the terminal device, wherein the RACH configuration of the multiple PRACH transmission includes a Group B configuration.

[0046] In some embodiments of this disclosure, the RACH configuration for the multiple PRACH transmission includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, and numberOfRA-PreamblesGroupA.

[0047] In some embodiments of this disclosure, the method further includes: in response to the RACH configuration of the multiple PRACH transmission sharing RO with other RACH configurations, sending the RACH configuration of the multiple PRACH transmission to the terminal device, wherein the RACH configuration of the multiple PRACH transmission includes a dedicated Group B configuration.

[0048] In some embodiments of this disclosure, the RACH configuration for dedicated multi-PRACH transmission includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, and numberOfRA-PreamblesGroupA.

[0049] In some embodiments of this disclosure, the method further includes: in response to the fact that the RACH configuration for the multiple PRACH transmission does not contain a dedicated ra-Msg3SizeGroupA, messagePowerOffsetGroupB, or numberOfRA-PreamblesGroupA, sending the RACH configuration for the multiple PRACH transmission to the terminal device, wherein the RACH configuration for the multiple PRACH transmission is the corresponding configuration in the RACH configuration of the shared RO.

[0050] In some embodiments of this disclosure, the Group B is configured as a 4-step RA configuration or a 2-step RA configuration.

[0051] A third aspect of this disclosure provides a multi-physical random access channel (PRACH) transmission apparatus applied to a terminal device. The apparatus includes a transmission unit for performing multiple PRACH transmissions, wherein each PRACH transmission selects the same or different preambles, and the preambles come from the same or different preamble groups.

[0052] A fourth aspect of this disclosure provides a multi-physical random access channel (PRACH) transmission apparatus applied to a second device. The apparatus includes a receiving unit for receiving random access PRACH transmissions from a terminal device, wherein the PRACH transmissions are PRACH transmissions in a multi-PRACH transmission sent by the terminal device; wherein the multi-PRACH transmissions include multiple PRACH transmissions, each PRACH transmission selecting the same or different preambles, the preambles coming from the same or different preamble groups.

[0053] The fifth embodiment of this disclosure provides a communication device, which includes: a transceiver; a memory; and a processor, which are respectively connected to the transceiver and the memory, and are configured to control the transmission and reception of wireless signals of the transceiver by executing computer-executable instructions on the memory, and to implement the method as described in the first or second aspect embodiment of this disclosure.

[0054] A sixth aspect of this disclosure provides a computer storage medium storing computer-executable instructions; when executed by a processor, the computer-executable instructions can implement the methods of the first or second aspect of this disclosure.

[0055] This disclosure provides a multi-PRACH transmission method and apparatus. During each PRACH transmission in a multi-PRACH transmission, the PRACH transmission can choose to use the same or different preambles. The preambles can also come from the same or different preamble groups. This provides a solution for selecting preambles and groups in multi-PRACH transmission, ensuring the normal and orderly transmission of multi-PRACH.

[0056] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0057] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0058] Figure 1 This is a flowchart illustrating a multi-PRACH transmission method on the terminal device side according to an embodiment of the present disclosure;

[0059] Figure 2 This is a flowchart illustrating a multi-PRACH transmission method on the network device side according to an embodiment of the present disclosure;

[0060] Figure 3 This is a flowchart illustrating a multi-PRACH transmission method according to an embodiment of the present disclosure;

[0061] Figure 4 This is a flowchart illustrating a multi-PRACH transmission method according to an embodiment of the present disclosure;

[0062] Figure 5 This is a flowchart illustrating a multi-PRACH transmission method according to an embodiment of the present disclosure;

[0063] Figure 6 This is a flowchart illustrating a multi-PRACH transmission method according to an embodiment of the present disclosure;

[0064] Figure 7 This is a schematic flowchart of a method for preamble configuration in multi-PRACH transmission according to an embodiment of the present disclosure;

[0065] Figure 8 This is a schematic flowchart of a method for RACH configuration in a multi-PRACH transmission according to an embodiment of the present disclosure;

[0066] Figure 9This is a schematic flowchart of a method for RACH configuration in a multi-PRACH transmission according to an embodiment of the present disclosure;

[0067] Figure 10 This is a block diagram of a multi-PRACH transmission device on the terminal device side according to an embodiment of the present disclosure;

[0068] Figure 11 This is a block diagram of a multi-PRACH transmission device on the terminal device side according to an embodiment of the present disclosure;

[0069] Figure 12 This is a block diagram of a multi-PRACH transmission device on the terminal device side according to an embodiment of the present disclosure;

[0070] Figure 13 This is a block diagram of a multi-PRACH transmission device on the terminal device side according to an embodiment of the present disclosure;

[0071] Figure 14 This is a block diagram of a multi-PRACH transmission device on the network device side according to an embodiment of the present disclosure;

[0072] Figure 15 This is a block diagram of a multi-PRACH transmission device on the network device side according to an embodiment of the present disclosure;

[0073] Figure 16 This is a block diagram of a multi-PRACH transmission device on the network device side according to an embodiment of the present disclosure;

[0074] Figure 17 This is a schematic diagram of the structure of a communication device according to an embodiment of the present disclosure;

[0075] Figure 18 This is a schematic diagram of the structure of a chip provided in an embodiment of the present disclosure. Detailed Implementation

[0076] Embodiments of this disclosure are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0077] With the continuous development of wireless communication, the requirements for communication capabilities are also increasing. One of the bottlenecks in uplink coverage is the Physical Random Access Channel (PRACH). To improve PRACH channel coverage, 3GPP Release 18 is preparing to develop a scheme based on multi-PRACH transmission. In related technologies, the random access procedure uses beams, where the SSB has multiple transmission opportunities within the time domain period and has corresponding numbers, each corresponding to a different beam. For the UE terminal device, the UE only has the opportunity to send a preamble when the SSB's beam scanning signal covers the UE. Regarding preamble resource configuration, related technologies divide preamble resources into two groups, Group A and Group B, from which the UE terminal device can select a preamble. Currently, how to select the preamble and group in multi-PRACH transmission needs to be addressed.

[0078] To address this, this disclosure proposes a multi-PRACH transmission method and apparatus, providing a solution for selecting preamble and group in multi-PRACH transmission, thereby ensuring normal and orderly transmission in multi-PRACH transmission.

[0079] In the embodiments of this disclosure, "multiple PRACH transmissions in a single instance" or "multiple PRACH transmissions" refers to a terminal performing multiple PRACH transmissions during a single random access; that is, a single PRACH transmission includes multiple PRACH transmissions. In the embodiments of this disclosure, "multiple" refers to two or more. In one possible implementation, the terminal can initiate multiple PRACH transmissions during a single random access.

[0080] The switching method and apparatus provided in this application will be described in detail below with reference to the accompanying drawings.

[0081] Figure 1 A flowchart illustrating a multi-PRACH transmission method according to an embodiment of this disclosure is shown. Figure 1 As shown, this method is applied to a terminal device and includes the following steps.

[0082] Step 101: The terminal device performs each PRACH transmission in the multi-PRACH transmission and determines the preamble to be used in each PRACH transmission. The preamble comes from the same or different preamble groups.

[0083] It's important to note that the preamble is the actual content transmitted by the UE in the Physical Random Access Channel (RACH). In related technologies, there are 13 preamble formats for PRACH. Furthermore, in LTE and NR, a cell has a total of 64 preambles, divided into two parts: CB preamble (Contention Based Preamble) and CF preamble (Contention Free Preamble). CB preamble can be further divided into Group A and Group B. Group B is introduced to allow the base station to obtain prior information, allocate resources selectively, and improve resource utilization efficiency. One RO (Random Access Channel Occasion) can use a maximum of 64 preambles. If N SSBs are mapped to one RO, each SSB can only "share" 64 preambles.

[0084] In embodiments of this disclosure, when a terminal device performs multiple PRACH transmissions, each PRACH transmission selects to use the same or different preambles. The preambles can come from the same or different preamble groups.

[0085] Furthermore, when performing multiple PRACH transmissions, whether each PRACH transmission can choose to use the same or different preambles can be determined according to the communication protocol or communication system agreement, or it can be set and sent to the terminal device by the network device. When determined by the protocol or system agreement, the same or different preambles are selected based on the protocol or system agreement. When the selection is sent by the network device, the terminal device receives the selection rules sent by the network device and selects the same or different preambles accordingly. Specific embodiments of this disclosure do not limit this.

[0086] In one embodiment of this disclosure, it can be determined according to a communication protocol that the terminal device uses the same preamble for each PRACH transmission in a multi-PRACH transmission by default; and in response to determining that the terminal device uses different preambles for each PRACH transmission in a multi-PRACH transmission, the network device sends a first indication message to instruct the terminal device to use different preambles. Accordingly, the terminal device can determine the preamble used for each PRACH transmission according to the communication protocol or the indication from the network device. In another embodiment of this disclosure, it can be determined according to a communication protocol that the terminal device uses different preambles for each PRACH transmission in a multi-PRACH transmission by default; and in response to determining that the terminal device uses the same preamble for each PRACH transmission in a multi-PRACH transmission, the network device sends a first indication message to instruct the terminal device to use the same preamble. Accordingly, the terminal device can determine the preamble used for each PRACH transmission according to the communication protocol or the indication from the network device. In another embodiment of this disclosure, when a terminal device uses the same preamble or different preambles for each PRACH transmission in a multi-PRACH transmission, the network device needs to indicate the preamble used for each PRACH transmission in the multi-PRACH transmission through a first indication message; the communication protocol does not stipulate a default configuration. Accordingly, the terminal device can determine the preamble used for each PRACH transmission based on the indication from the network device. In another embodiment of this disclosure, in a multi-PRACH transmission, each PRACH transmission may use the same preamble for some parts and a different preamble for others. In the three embodiments described above, there are three scenarios: the terminal device uses the same preamble for each PRACH transmission in a multi-PRACH transmission; the terminal device uses different preambles for each PRACH transmission in a multi-PRACH transmission; and each PRACH transmission may use the same preamble for some parts and a different preamble for others. The concept is the same as in the three embodiments described above, and can be achieved through default configuration of the communication protocol or instruction from the network device, which will not be elaborated further here. It should be noted that this limitation can be applied to any embodiment of the present disclosure, and therefore will not be elaborated further in other embodiments.

[0087] When configured and distributed to terminal devices by network devices, embodiments of this disclosure also provide a multi-PRACH transmission method, such as... Figure 2As shown, the method includes:

[0088] Step 201: The network device receives a random access PRACH transmission from the terminal device, wherein the PRACH transmission is at least one of multiple PRACH transmissions sent by the terminal device; wherein the multiple PRACH transmissions include multiple PRACH transmissions, and each PRACH transmission selects to use the same or different preambles, and the preambles come from the same or different preamble groups.

[0089] In the embodiments of this disclosure, the description of the network device receiving the random access PRACH transmission of the terminal device can be found in the relevant descriptions of the prior art, and will not be repeated here.

[0090] In one embodiment of this disclosure, the communication protocol can determine that the terminal device uses the same preamble for each PRACH transmission in a multi-PRACH transmission by default; and in response to determining that the terminal device uses different preambles for each PRACH transmission in a multi-PRACH transmission, a first indication message is sent to instruct the terminal device to use different preambles. Alternatively, in another embodiment of this disclosure, the communication protocol can determine that the terminal device uses different preambles for each PRACH transmission in a multi-PRACH transmission by default; and in response to determining that the terminal device uses the same preamble for each PRACH transmission in a multi-PRACH transmission, a first indication message is sent to instruct the terminal device to use the same preamble. Alternatively, in another embodiment of this disclosure, whether the terminal device uses the same preamble or different preambles for each PRACH transmission in a multi-PRACH transmission needs to be indicated by a first indication message; the communication protocol does not specify a default configuration. In another embodiment of this disclosure, in a multi-PRACH transmission, each PRACH transmission may use the same preamble for some parts and a different preamble for others. In the three embodiments described above, there are three scenarios: the terminal device uses the same preamble for each PRACH transmission in a multi-PRACH transmission; the terminal device uses different preambles for each PRACH transmission in a multi-PRACH transmission; and each PRACH transmission may use the same preamble for some parts and a different preamble for others. The concept is the same as in the three embodiments described above, and can be achieved through default configuration of the communication protocol or instruction from the network device, which will not be elaborated further here. It should be noted that this limitation can be applied to any embodiment of the present disclosure, and therefore will not be elaborated further in other embodiments.

[0091] This disclosure provides a multi-PRACH transmission method and apparatus. During each PRACH transmission in a multi-PRACH transmission, the PRACH transmission can choose to use the same or different preambles. The preambles can also come from the same or different preamble groups. This provides a solution for selecting preambles and groups in multi-PRACH transmission, ensuring the normal and orderly transmission of multi-PRACH.

[0092] It should be noted that in related technologies, the random access procedure uses beams. The SSB (Service Subframe) has multiple transmission opportunities within a time-domain period and is assigned a corresponding number, each corresponding to a different beam. For the UE (User Equipment) terminal, the UE can only transmit a preamble when the SSB's beam scanning signal covers the UE. When the network receives the UE's preamble, it knows the optimal downlink beam; in other words, it knows which beam velocity is pointing towards the UE. Therefore, the SSB needs to be associated with the preamble. Since the preamble can only be transmitted in the RO (Redirecting Optical Range), the SSB is associated with the RO. In the time domain, a subframe (FR1) or a 60kHz time slot (FR2) may have multiple PRACH time slots, and a PRACH time slot may have multiple ROs. In the frequency domain, there may be multiple ROs at the same time. A cell can have a maximum of 8 (FR1) SSBs or 64 (FR2) SSBs. The SSBs of a cell have a corresponding relationship with the ROs. The corresponding relationship can refer to the methods in existing technologies; the specific embodiments disclosed in this disclosure are not limited in this regard. Based on the correspondence between SSBs and ROs, the embodiments of this disclosure can determine the transmission order of each PRACH in a single multi-PRACH transmission based on the position order of the ROs. Specifically, it can be based on the ROs corresponding to the same SSB, the ROs in the same time domain, or different SSBs and different time domains corresponding to ROs; the embodiments of this disclosure do not impose any limitations on this. The following will describe different scenarios separately.

[0093] In some embodiments of this disclosure, when performing multiple PRACH transmissions, and each PRACH transmission selects to use the same or different preambles, the following methods (including, but not limited to, Method 1, Method 2, or Method 3) can be used to achieve this. These methods include:

[0094] Method 1: In some embodiments of this disclosure, when a terminal device performs multiple PRACH transmissions, and each PRACH transmission selects to use the same preamble, the following method can be used, but is not limited to:

[0095] In each PRACH transmission within a single multi-PRACH transmission, the preamble selected by the first PRACH transmission in the single multi-PRACH transmission is used. In embodiments of this disclosure, the method for selecting the preamble for the first PRACH transmission in a multi-PRACH transmission can refer to existing related methods, and this disclosure does not limit this approach.

[0096] Method 2: In some embodiments of this disclosure, when a terminal performs multiple PRACH transmissions, and each PRACH transmission uses a different preamplifier, the following method can be used, but is not limited to:

[0097] The first X PRACH transmissions in a single multi-PRACH transmission all use the first preamble selected by the first PRACH transmission in that single multi-PRACH transmission. Each subsequent PRACH transmission from the (X+1)th PRACH transmission onwards uses the second preamble reselected by the (X+1)th PRACH transmission; wherein the first preamble and the second preamble are different. That is, some PRACH transmissions use the first preamble, and some PRACH transmissions use the second preamble; of course, other PRACH transmissions may use other preambles, which is not limited here.

[0098] In the embodiments of this disclosure, the X value can be agreed upon by the system or specified by the network. When specified by the network, the network device configures and sends the X value to the terminal device, and the terminal device performs each PRACH transmission in the multi-PRACH transmission based on the received X value. When agreed upon by the system, the terminal device obtains the X value according to the system agreement and performs each PRACH transmission in the multi-PRACH transmission based on the X value. The embodiments of this disclosure do not limit the specific method used. Furthermore, in the embodiments of this disclosure, the method for selecting the preamble for the first PRACH transmission in the multi-PRACH transmission can refer to existing related methods, and the embodiments of this disclosure do not limit this method.

[0099] In the embodiments of this disclosure, it should be noted that the second preamble selected by the reselection can be different from the first PRACH transmission selection preamble, or it can be the same as the first PRACH transmission selection preamble. Specifically, the embodiments of this disclosure do not limit this.

[0100] Method 3: In some embodiments of this disclosure, when a terminal performs multiple PRACH transmissions, and each PRACH transmission selects a different preamplifier, the following method can be used, but is not limited to:

[0101] Each PRACH transmission in a single PRACH transmission uses its corresponding selected preamble.

[0102] In the embodiments of this disclosure, each PRACH transmission in a multi-PRACH transmission can independently select its preamble. The selected preambles can be the same or different; specific embodiments of this disclosure do not impose limitations in this regard. When the preamble is the same, it can be the first preamble selected for the first PRACH transmission in the multi-PRACH transmission, or it can be another preamble. When the preambles are different, each PRACH transmission can select a different preamble. Specific embodiments of this disclosure do not impose limitations in this regard.

[0103] As described above, in some embodiments of this disclosure, whether different preambles are used for each PRACH transmission in a multi-PRACH transmission can be set by the network device or agreed upon by the system. When agreed upon by the system, the terminal device can determine whether the same or different preambles are allowed for each PRACH transmission in a multi-PRACH transmission based on the system. The embodiments of this disclosure will not be described in detail here.

[0104] The following examples address the scenario where the network device configures and distributes multiple PRACH transmissions using different preambles, such as... Figure 3 As shown, the method includes:

[0105] 301. The network device configures whether different preambles are allowed for each PRACH transmission in a multi-PRACH transmission, and sends a first indication message to the terminal device. The first indication message is used to indicate whether the same or different preambles are allowed for each PRACH transmission in a multi-PRACH transmission.

[0106] 302. The terminal device receives a first indication information sent by the network device, the first indication information being used to indicate the preamble used by each PRACH transmission in the multi-PRACH transmission.

[0107] The method further includes one or more of the following steps:

[0108] 303. In response to determining, according to the communication protocol or the first indication information, that each PRACH transmission in the multi-PRACH transmission is allowed to use a different preamble, perform each PRACH transmission in the multi-PRACH transmission, wherein each PRACH transmission selects to use a different preamble.

[0109] The specific description of the different preambles used in each PRACH transmission during the multi-PRACH transmission by the terminal device can be found in the above description, and will not be repeated here.

[0110] In the embodiments of this disclosure, it should be noted that the selection of different preambles for each PRACH transmission can be either completely different or not entirely the same. Selecting completely different preambles for each PRACH transmission means that each PRACH transmission within each PRACH transmission uses a different preamble; selecting not entirely the same preamble means that some PRACH transmissions within each PRACH transmission use the same preamble while others use different preambles. Specifically, the embodiments of this disclosure do not impose limitations in this regard.

[0111] 304. In response to determining, according to the communication protocol or the first indication information, that each PRACH transmission in the multi-PRACH transmission is not allowed to use different preambles, perform each PRACH transmission in the multi-PRACH transmission, wherein each PRACH transmission selects to use the same preamble.

[0112] The specific description of how the terminal device selects the same preamble for each PRACH transmission in the process of performing multiple PRACH transmissions can be found in the above response description, and will not be repeated here.

[0113] This disclosure provides a multi-PRACH transmission method and apparatus. During each PRACH transmission in a multi-PRACH transmission, the ability to select whether to use the same or different preambles for each PRACH transmission can be configured and issued by the network device. The terminal device can select the same or different preambles for each PRACH transmission based on the first instruction information issued by the network device. This provides a solution for multi-PRACH transmission preamble selection, ensuring the normal and orderly transmission of multiple PRACH transmissions.

[0114] In some embodiments of this disclosure, when a terminal device performs multiple PRACH transmissions in an RO associated with an SSB, the multiple PRACH transmission method can be implemented using, but is not limited to, method one, method two, or method three, or a combination of the following methods; the method includes:

[0115] Method 1: In a multi-PRACH transmission within an SSB-associated RO, all PRACH transmissions use the same preamble. Different multi-PRACH transmissions may use the same or different preambles for their individual PRACH transmissions, but within the same multi-PRACH transmission, each PRACH transmission reselects its own preamble. Specific methods include, but are not limited to, the following:

[0116] In response to a first RO transmission associated with a first SSB, each PRACH transmission of a multi-PRACH transmission on the first RO selects to use the preamble selected by the first PRACH transmission on the first SSB.

[0117] In response to a multi-PRACH transmission switching from a first RO associated with a first SSB to a second RO associated with a second SSB, each PRACH transmission in the multi-PRACH transmission on the second RO selects a reselected preamble. It should be noted that the reselected preambles for these PRACH transmissions may not be exactly the same or completely different, or they may be the same.

[0118] Method 2: In a multi-PRACH transmission within an SSB-associated RO, one portion of each PRACH transmission uses the same preamble, and the other portion of each PRACH transmission uses the same preamble. The preamble used in one portion of the PRACH transmission can be the same as or different from the preamble used in the other portion, but the other portion of each PRACH transmission in the multi-PRACH transmission must reselect the preamble used by its individual PRACH transmissions. Specific methods include, but are not limited to, the following:

[0119] In response to a first RO transmission associated with a first SSB in a multi-PRACH transmission, the first X PRACH transmissions of the multi-PRACH transmission on the first RO all select the first preamble selected by the first PRACH transmission on the first SSB, and each subsequent PRACH transmission uses the second preamble reselected by the (X+1)th PRACH transmission; wherein the first preamble and the second preamble are different. That is, some PRACHs use the first preamble, and some PRACHs use the second preamble; of course, other parts of the PRACHs may use other preambles, which is not limited here.

[0120] In embodiments of this disclosure, the X value is agreed upon by the system or specified by the network. When the X value is agreed upon by the system, the terminal device obtains the X value based on the system agreement and performs multi-PRACH transmission according to the rules described above. When the X value is specified by the network, that is, configured and sent to the terminal device by the network device, the terminal device receives the X value sent by the network device and performs multi-PRACH transmission according to the rules described above based on the received X value.

[0121] Method 3: In a multi-PRACH transmission within an SSB-associated RO, a preamble is selected for each PRACH transmission. The selected preamble can be the same or different for each PRACH transmission, but each PRACH transmission in a multi-PRACH transmission will reselect the preamble used for each of its individual PRACH transmissions. Specific methods include, but are not limited to, the following:

[0122] In response to a multi-PRACH transmission in connection with a first RO transmission associated with a first SSB, each PRACH transmission in a multi-PRACH transmission on the first RO uses its own reselected preamble; the reselected preambles of these PRACH transmissions may not be exactly the same or completely different, or they may be the same.

[0123] In some embodiments of this disclosure, whether different preambles are allowed for the various PRACH transmissions in the first RO transmission associated with the first SSB in the multi-PRACH transmission of the terminal device can be set by the network device, or agreed upon by the communication protocol or the system. When agreed upon by the communication protocol or the system, the terminal device can determine whether different preambles are allowed for the various PRACH transmissions in the first RO transmission associated with the first SSB in the multi-PRACH transmission of the system. The embodiments of this disclosure will not be described in detail.

[0124] The following embodiments address whether different preambles are allowed for the various PRACH transmissions in the first RO transmission associated with the first SSB when configuring and distributing the multi-PRACH transmissions on the network device. Figure 4 As shown, the method includes:

[0125] 401. The network device configures the preamble used by each PRACH transmission in the first RO transmission associated with the first SSB for multiple PRACH transmission, and sends a second indication information to the terminal device. The second indication information is used to indicate the preamble used by each PRACH transmission in the first RO transmission associated with the first SSB for multiple PRACH transmission.

[0126] 402. The terminal device receives the second instruction information sent by the network device.

[0127] The method further includes one or more of the following steps:

[0128] 403. In response to determining, according to the communication protocol or the second indication information, that each PRACH transmission in the first RO transmission associated with the first SSB is allowed to use a different preamble, the process of performing each PRACH transmission in the multiple PRACH transmission is executed, wherein each PRACH transmission selects to use a different preamble.

[0129] The specific description of the different preambles used in each PRACH transmission during the multi-PRACH transmission by the terminal device can be found in the above description, and will not be repeated here.

[0130] In the embodiments of this disclosure, it should be noted that the selection of different preambles for each PRACH transmission can be either completely different or not entirely the same. Selecting completely different preambles for each PRACH transmission means that each PRACH transmission within each PRACH transmission uses a different preamble; selecting not entirely the same preamble means that some PRACH transmissions within each PRACH transmission use the same preamble while others use different preambles. Specifically, the embodiments of this disclosure do not impose limitations in this regard.

[0131] 404. In response to determining, according to the communication protocol or the second indication information, that each PRACH transmission in the first RO transmission associated with the first SSB is not allowed to use different preambles, the process of performing each PRACH transmission in the multiple PRACH transmission is executed, wherein each PRACH transmission selects to use the same preamble.

[0132] The specific description of how the terminal device selects the same preamble for each PRACH transmission in the process of performing multiple PRACH transmissions can be found in the above response description, and will not be repeated here.

[0133] This disclosure provides a multi-PRACH transmission method and apparatus. During each PRACH transmission in a multi-PRACH transmission, whether different preambles are allowed for each PRACH transmission in the first RO transmission associated with the first SSB can be configured and issued by the network device. The terminal device can select the same or different preambles for each PRACH transmission in the first RO transmission associated with the first SSB based on the first instruction information issued by the network device. This provides a solution for selecting multi-PRACH transmission preambles, ensuring the normal and orderly transmission of multi-PRACH.

[0134] In some embodiments of this disclosure, when a terminal device performs multiple PRACH transmissions at different ROs at the same time domain location, the multiple PRACH transmission method can be implemented using, but is not limited to, the following method one, method two, method three, or method four, or a combination of the following methods; the method includes:

[0135] Method 1: For multiple PRACH transmissions at different ROs in the same time domain, all PRACH transmissions use the same preamble. The preambles used for different PRACH transmissions in subsequent multiple PRACH transmissions can be the same or different, but each time a multiple PRACH transmission occurs at different ROs in the same time domain, a new preamble is selected for each PRACH transmission in that specific multiple PRACH transmission. Specific methods include, but are not limited to, the following:

[0136] In response to a second RO transmission of a multi-PRACH transmission at the first time-domain location, each PRACH transmission of the multi-PRACH transmission on the second RO selects to use the same preamble.

[0137] In response to a multi-PRACH transmission switching from a second RO at a first time domain location to a third RO at a second time domain location, each PRACH transmission in the multi-PRACH transmission on the third RO selects a reselected preamble. It should be noted that the reselected preambles for these PRACH transmissions may not be identical or completely different, or they may be identical.

[0138] Method 2: In a multi-PRACH transmission at different ROs in the same time domain, one part of the PRACH transmission uses the same preamble, and the other part of each PRACH transmission uses the same preamble. The preamble used by one part of the PRACH transmission and the preamble used by the other part can be the same or different, but the other part of each PRACH transmission in the multi-PRACH transmission must reselect the preamble used by each of its individual PRACH transmissions. Specific methods include, but are not limited to, the following:

[0139] In response to multiple PRACH transmissions occurring at different Return Entries (ROs) in the same time domain, the first X PRACH transmissions on the different ROs all use the same first preamble, and each subsequent PRACH transmission from the (X+1)th PRACH transmission uses a newly selected second preamble; wherein the first preamble and the second preamble are different. That is, some PRACHs use the first preamble, and some PRACHs use the second preamble; of course, other PRACHs may use other preambles, which is not limited here.

[0140] In embodiments of this disclosure, the X value is agreed upon by the system or specified by the network. When the X value is agreed upon by the system, the terminal device obtains the X value based on the system agreement and performs multi-PRACH transmission according to the rules described above. When the X value is specified by the network, that is, configured and sent to the terminal device by the network device, the terminal device receives the X value sent by the network device and performs multi-PRACH transmission according to the rules described above based on the received X value.

[0141] Method 3: For multiple PRACH transmissions at different ROs in the same time domain, each PRACH transmission uses a preamble. The preamble used for each PRACH transmission can be the same or different, but each PRACH transmission in a single multi-PRACH transmission reselects the preamble used for each of its individual PRACH transmissions. Specific methods include, but are not limited to, the following:

[0142] In response to multiple PRACH transmissions occurring at different ROs in the same time domain, each PRACH transmission in the multiple PRACH transmissions at the different ROs selects a reselected preamble. It should be noted that the reselected preambles for these different PRACH transmissions may not be exactly the same or completely different, or they may be the same.

[0143] Method 4: When performing multiple PRACH transmissions at different ROs in different time domain locations within the same SSB, all PRACH transmissions at each different RO in each time domain location should use the same preamble. The preamble used for each PRACH transmission in a single multi-PRACH transmission at different time domain locations within the same SSB can be the same or different, but each time a multi-PRACH transmission is performed at different ROs in the same time domain location, a new preamble should be selected for each PRACH transmission in that specific multi-PRACH transmission. Specifically, this can be, but is not limited to, at least one of the following methods:

[0144] In response to multiple PRACH transmissions at different ROs at the first time-domain location of the same SSB, each PRACH transmission of the multiple PRACH transmission at the different ROs selects to use the same preamble.

[0145] When a multi-PRACH transmission switches from a different RO at a first time-domain location within the same SSB to a different RO at a second time-domain location within the same SSB, each PRACH transmission in the multi-PRACH transmission at the different RO at the second time-domain location selects a newly selected preamble. It should be noted that the newly selected preambles for these PRACH transmissions may not be identical or completely different, or they may be identical.

[0146] In some embodiments of this disclosure, whether different preambles are allowed for the various PRACH transmissions of different RO transmissions at the same time domain location in the multi-PRACH transmissions of the terminal device can be set by the network device or agreed upon by the system. When agreed upon by the system, the terminal device can determine whether different preambles are allowed for the various PRACH transmissions of different RO transmissions at the same time domain location in the multi-PRACH transmissions of the system. The embodiments of this disclosure will not be described in detail.

[0147] The following examples address whether different preambles are allowed for the various PRACH transmissions in different RO transmissions at the same time domain location when configuring and distributing multiple PRACH transmissions in a network device. Figure 5 As shown, the method includes:

[0148] 501. The network device configures whether different preambles are allowed for each PRACH transmission in different RO transmissions at the same time domain location of multiple PRACH transmissions, and sends a third indication information to the terminal device. The third indication information is used to indicate whether different preambles are allowed for each PRACH transmission in different RO transmissions at the same time domain location of multiple PRACH transmissions.

[0149] 502. The terminal device receives a third indication information sent by the network device. The third indication information is used for the preamble of each PRACH transmission in different RO transmissions at the same time domain location of multiple PRACH transmissions.

[0150] The method further includes one or more of the following steps:

[0151] 503. In response to determining, according to the communication protocol or the third indication information, that each PRACH transmission in different RO transmissions at the same time domain location of multiple PRACH transmissions is allowed to use different preambles, the process of performing each PRACH transmission in the multiple PRACH transmissions is executed, wherein each PRACH transmission selects to use a different preamble.

[0152] The specific description of the different preambles used in each PRACH transmission during the multi-PRACH transmission by the terminal device can be found in the above description, and will not be repeated here.

[0153] In the embodiments of this disclosure, it should be noted that the selection of different preambles for each PRACH transmission can be either completely different or not entirely the same. Selecting completely different preambles for each PRACH transmission means that each PRACH transmission within each PRACH transmission uses a different preamble; selecting not entirely the same preamble means that some PRACH transmissions within each PRACH transmission use the same preamble while others use different preambles. Specifically, the embodiments of this disclosure do not impose limitations in this regard.

[0154] 504. In response to determining, according to the communication protocol or the third indication information, that the PRACH transmissions in different RO transmissions at the same time domain location are not allowed to use different preambles, the PRACH transmissions in the multiple PRACH transmissions are performed, wherein each PRACH transmission selects to use the same preamble.

[0155] The specific description of how the terminal device selects the same preamble for each PRACH transmission in the process of performing multiple PRACH transmissions can be found in the above response description, and will not be repeated here.

[0156] This disclosure provides a multi-PRACH transmission method and apparatus. During each PRACH transmission in a multi-PRACH transmission, whether different preambles are allowed for the PRACH transmissions in different RO transmissions at the same time domain location can be configured and issued by the network device. The terminal device can select the same or different preambles for the PRACH transmissions in different RO transmissions at the same time domain location based on the first instruction information issued by the network device. This provides a solution for selecting multi-PRACH transmission preambles, ensuring the normal and orderly transmission of multi-PRACH transmissions.

[0157] In this embodiment, the preamble is the actual content transmitted by the UE in the Physical Random Access Channel (PRACH). In NR, there are 13 preamble formats for PRACH. Furthermore, in both LTE and NR, a cell has a total of 64 preambles, which are divided into two parts: CB preamble (Contention Based Preamble) and CF preamble (Contention Free Preamble). CB preamble can be further divided into Group A and Group B. Group B is introduced to allow the base station to obtain prior information, allocate resources selectively, and improve resource utilization efficiency. One RO can use a maximum of 64 preambles. If N SSBs map to one RO, each SSB can only "share" 64 preambles.

[0158] Therefore, for each PRACH transmission in a multi-PRACH transmission, the preamble used for each PRACH transmission is selected from any of the following groups: Group A, Group B, and Group A+Group B. That is, when selecting the preamble, it can be selected from Group A, Group B, or Group A+Group B. The specific embodiments of this disclosure do not limit this, and the selection of the preamble source can be based on the actual situation.

[0159] In some embodiments of this disclosure, the selection of the preamble used for each PRACH transport from which a Group is chosen can be, but is not limited to, selecting the preamble used for each PRACH transport in a multi-PRACH transport based on the RACH configuration of the multi-PRACH transport, such as... Figure 6 As shown, the multi-PRACH transmission method includes:

[0160] 601. The network device sends a RACH configuration for multiple PRACH transmission to the terminal device.

[0161] 602. The terminal device selects from which group to choose the preamble to use for each PRACH transmission based on the RACH configuration of the multi-PRACH transmission.

[0162] As mentioned above, when selecting the preamble for each PRACH transmission in a multi-PRACH transmission, it is necessary to select the first preamble for each PRACH transmission in the multi-PRACH transmission, and it is also necessary to select the preamble again. The following describes the selection of the first preamble, specifically including at least one of the following methods: Method 1, Method 2, Method 3, Method 4, or Method 5:

[0163] Method 1: When the RACH configuration of the multi-PRACH transmission only includes the configuration of Group A, the terminal device responds to the fact that the RACH configuration of the multi-PRACH transmission only includes the configuration of Group A, and selects the first preamble from Group A.

[0164] Method 2: When the RACH configuration of the multi-PRACH transmission only includes the configuration of Group B, the terminal device responds to the configuration of the multi-PRACH transmission only including the configuration of Group B and selects the first preamble from Group B.

[0165] Method 3: When the RACH configuration of multi-PRACH transmission includes the configuration of Group A+Group B, the terminal device responds to the configuration of multi-PRACH transmission including the configuration of Group A+Group B by selecting the first preamble from Group A+Group B.

[0166] In the embodiments of this disclosure, it should be noted that when selecting the first preamble from Group A + Group B, whether to select the first preamble from Group A or Group B can be achieved using, but is not limited to, the following methods, which include:

[0167] The terminal device determines whether the size of msg3 meets the threshold ra-Msg3SizeGroupA; if it meets the threshold, the first preamble is selected from Group A; if it does not meet the threshold, the first preamble is selected from Group B.

[0168] Method 4: When the RACH configuration of multiple PRACH transmissions shares the RO with other RACH configurations, the terminal device responds to the fact that the RACH configuration of multiple PRACH transmissions shares the RO with other RACH configurations by selecting the first preamble from Group A.

[0169] In the embodiments of this disclosure, it should be noted that when the RACH configuration of multiple PRACH transmissions shares RO with other RACH configurations, the terminal device selects the first preamble from the Group A, regardless of whether the other RACH configurations contain the Group B configuration.

[0170] Method 5: When the RACH configuration of multi-PRACH transmission shares the RO with other RACH configurations, and the other RACH configurations include the configuration of Group B, the terminal device, in response to the fact that the RACH configuration of multi-PRACH transmission shares the RO with other RACH configurations, and the other RACH configurations include the configuration of Group B, determines whether to select the first preamble from Group B or Group A according to the fourth instruction issued by the network device. The fourth instruction information is used to indicate whether the terminal device selects the first preamble from Group B.

[0171] In embodiments of this disclosure, it should be noted that when the RACH configuration for multi-PRACH transmission shares the same RO with other RACH configurations, if the other RACH configurations include a Group B configuration, the network device will send an indication message to the terminal device, indicating whether to select the first preamble from Group B. If the fourth indication message indicates that the terminal device should select the first preamble from Group B, the terminal device will respond to the fourth indication message by selecting the first preamble from Group B; if the fourth indication message does not indicate that the terminal device should select the first preamble from Group B, then the terminal device will respond to the fourth indication message by selecting the first preamble from Group A. It should be noted that the above-described method for selecting a preamble from two Groups can be used in any embodiment of this disclosure, and will not be repeated here.

[0172] As described above, in the embodiments of this disclosure, it should be noted that determining whether the RACH configuration includes the configuration of Group B can be achieved using, but is not limited to, the following methods:

[0173] When the RACH configuration for multi-PRACH transmission uses separate RO with other RACH configurations, the RACH configuration of the separate RO for multi-PRACH transmission does not include the Group B configuration. The terminal device obtains the RACH configuration.

[0174] The above describes the initial preamble selection process for the terminal device. The following will explain the reselection of the preamble, specifically including:

[0175] When performing each PRACH transmission in a multi-PRACH transmission, after selecting the first preamble to be used for each PRACH transmission from any of the following groups, the preamble selected after the first preamble is reselected to obtain a reselected preamble. The reselected preamble is selected from the group containing the first preamble, or from other groups besides the group containing the first preamble.

[0176] In the embodiments of this disclosure, the Group in which the reselected preamble is located can be the same Group as the Group in which the first preamble was located, or it can be a different Group. Whether the same or different Group is used can be configured by the network device and sent to the terminal device. After receiving the instruction from the network device, the terminal device reselects the preamble based on the instruction. Specifically, as follows... Figure 7 As shown, it includes:

[0177] 701. Send a fifth instruction message to the terminal device, the fifth instruction message being used to indicate whether the reselection of the preamble needs to be the same as the first preamble selection.

[0178] 702. The terminal device receives the fifth instruction information sent by the network device and obtains the content of the fifth instruction information.

[0179] 703. In response to the fifth instruction message indicating that the reselection of the preamble needs to be the same group as the first preamble selection, the preamble is reselected according to the rules of the first preamble selection group.

[0180] In the embodiments disclosed herein, the specific implementation of reselecting the preamble can refer to the rules for selecting the Group for the first preamble, which will not be repeated here.

[0181] This disclosure provides a multi-PRACH transmission method and apparatus. During each PRACH transmission in a multi-PRACH transmission, the PRACH transmission can choose to use the same or different preambles. The preambles can also come from the same or different preamble groups. This provides a solution for selecting preambles and groups in multi-PRACH transmission, ensuring the normal and orderly transmission of multi-PRACH.

[0182] As described above, in the multi-PRACH transmission method, the selection of which group the preamble for each PRACH transmission in the multi-PRACH transmission is from can be based on the RACH configuration issued by the network device. The following will elaborate on this RACH configuration. When the network device's RACH configuration for multi-PRACH transmission uses a separate RO with other RACH configurations, such as... Figure 8 As shown, it includes:

[0183] 801. The network device configures the RACH configuration for multiple PRACH transmissions to be separate from other RACH configurations using an independent random access channel timing (separate RO). The RACH configuration for multiple PRACH transmissions includes a Group B configuration.

[0184] When a network device is configured to use separate RO for RACH configuration of multiple PRACH transmissions, the RACH configuration of multiple PRACH transmissions may include the configuration of Group B. The RACH configuration of multiple PRACH transmissions may include one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, numberOfRA-PreamblesGroupA.

[0185] In this embodiment, when the RACH configuration of the multi-PRACH transmission in the network configuration adopts separateRO with other RACH configurations, the configuration of Group B included in the RACH configuration of the multi-PRACH transmission can be a 4-step RA configuration or a 2-step RA configuration respectively.

[0186] 802. The terminal device receives the RACH configuration for multiple PRACH transmissions sent by the network device, wherein the RACH configuration for multiple PRACH transmissions includes a Group B configuration.

[0187] As described above, when a network device configures a multi-PRACH transmission RACH configuration using a separate RO with other RACH configurations, the network device sends the multi-PRACH transmission RACH configuration to the terminal device. This multi-PRACH transmission RACH configuration includes a Group B configuration, which includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, and numberOfRA-PreamblesGroupA. The Group B configuration included in this multi-PRACH transmission RACH configuration can be a 4-step RA configuration or two separate 2-step RA configurations.

[0188] When the network is configured with multiple RACH transmissions and shares the RO (RACHOccasion) with other RACH configurations, such as Figure 9 As shown, it includes:

[0189] 901. The network device configures the RACH configuration for multiple PRACH transmissions to share the RO with other RACH configurations, and sends the RACH configuration for multiple PRACH transmissions to the terminal device. The RACH configuration for multiple PRACH transmissions includes Group B configuration.

[0190] When a network device is configured to share the RO with other RACH configurations for multiple PRACH transmissions, the RACH configuration for multiple PRACH transmissions may include the configuration of Group B. The RACH configuration for multiple PRACH transmissions may include one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, numberOfRA-PreamblesGroupA.

[0191] In this embodiment, when the RACH configuration of the multi-PRACH transmission in the network configuration shares the RO with other RACH configurations, the Group B configuration included in the RACH configuration of the multi-PRACH transmission can be a 4-step RA configuration or a 2-step RA configuration.

[0192] 902. The terminal device receives the RACH configuration for multiple PRACH transmissions sent by the network device, wherein the RACH configuration for multiple PRACH transmissions includes a Group B configuration.

[0193] As described above, when the RACH configuration for multi-PRACH transmission of a network device shares the RO with other RACH configurations, the network device sends the multi-PRACH transmission RACH configuration to the terminal device. This multi-PRACH transmission RACH configuration includes a Group B configuration, which includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, and numberOfRA-PreamblesGroupA. The Group B configuration included in this multi-PRACH transmission RACH configuration can be a 4-step RA configuration or two separate 2-step RA configurations.

[0194] Additionally, it should be noted in this embodiment that when there is no dedicated ra-Msg3SizeGroupA, messagePowerOffsetGroupB, or numberOfRA-PreamblesGroupA, a RACH configuration for multiple PRACH transmissions is sent to the terminal device. This RACH configuration for multiple PRACH transmissions corresponds to the configuration in the shared RO RACH configuration. When the terminal device receives this RACH configuration, it selects the preamble group based on the shared RO RACH configuration.

[0195] Corresponding to the multi-PRACH transmission methods provided in the above embodiments, this disclosure also provides a multi-PRACH transmission device. Since the multi-PRACH transmission device provided in this disclosure corresponds to the multi-PRACH transmission methods provided in the above embodiments, the implementation methods of the multi-PRACH transmission methods are also applicable to the multi-PRACH transmission device provided in this embodiment, and will not be described in detail in this embodiment.

[0196] Figure 10 This is a schematic diagram of a multi-PRACH transmission device 1000 provided according to an embodiment of the present disclosure. The multi-PRACH transmission device 1000 can be used in terminal devices.

[0197] like Figure 10 As shown, the multi-PRACH transmission device 1000 may include: a transmission unit 1001.

[0198] The transmission unit 1001 is used to perform each PRACH transmission in a multi-PRACH transmission, and to determine the preamble to be used in each PRACH transmission, wherein the preamble comes from the same or different preamble groups.

[0199] In some embodiments of this disclosure, the transmission unit 1001 is further configured to:

[0200] Each PRACH transmission in the aforementioned multi-PRACH transmission is performed, and each PRACH transmission selects the preamble chosen by the first PRACH transmission in the aforementioned multi-PRACH transmission.

[0201] In some embodiments of this disclosure, the transmission unit 1001 is further configured to: use the first preamble selected by the first PRACH transmission in the first PRACH transmission for the first X PRACH transmission in the first PRACH transmission, and use the second preamble selected by the (X+1)th PRACH transmission for each subsequent PRACH transmission; wherein the first preamble and the second preamble are different.

[0202] In some embodiments of this disclosure, the X value is specified by a communication protocol, a system protocol, or a network device.

[0203] In some embodiments of this disclosure, the transmission unit 1001 is further configured to: use its respective selected preamble for each PRACH transmission in the single PRACH transmission.

[0204] In some embodiments of this disclosure, such as Figure 11 As shown, the multi-PRACH transmission device 1000 further includes a first receiving unit 1002.

[0205] The first receiving unit 1002 is used to receive first indication information sent by the network device, the first indication information being used to indicate the preamble used by each PRACH transmission in the multi-PRACH transmission.

[0206] In some embodiments of this disclosure, the transmission unit 1001 is further used in at least one of the following steps:

[0207] In response to determining, based on the communication protocol or the first indication information, that each PRACH transmission in the multi-PRACH transmission uses a different preamble, the respective PRACH transmissions in the multi-PRACH transmission are executed accordingly, wherein each PRACH transmission selects to use a different preamble; and

[0208] In response to determining, according to the communication protocol or the first indication information, that each PRACH transmission in the multi-PRACH transmission is not allowed to use different preambles, the respective PRACH transmissions in the multi-PRACH transmission are executed accordingly, wherein each PRACH transmission selects to use the same preamble.

[0209] In some embodiments of this disclosure, the transmission unit 1001 is further used in at least one of the following steps:

[0210] In response to a first RO transmission associated with a first SSB, each PRACH transmission of a multi-PRACH transmission on the first RO selects to use the preamble selected by the first PRACH transmission on the first SSB.

[0211] In response to a multi-PRACH transmission switching from a first RO associated with a first SSB to a second RO associated with a second SSB, each PRACH transmission of the multi-PRACH transmission on the second RO selects to use a reselected preamble.

[0212] In some embodiments of this disclosure, the transmission unit 1001 is further configured to:

[0213] In response to a first RO transmission associated with a first SSB, the first X PRACH transmissions of a multi-PRACH transmission on the first RO all select the first preamble selected by the first PRACH transmission on the first SSB, and each subsequent PRACH transmission from the (X+1)th PRACH transmission uses the second preamble reselected by the (X+1)th PRACH transmission; wherein the first preamble is different from the second preamble.

[0214] In some embodiments of this disclosure, the X value is specified by a communication protocol, a system protocol, or a network device.

[0215] In some embodiments of this disclosure, the transmission unit 1001 is further configured to:

[0216] In response to a multi-PRACH transmission in connection with a first RO transmission associated with a first SSB, each PRACH transmission in a multi-PRACH transmission on the first RO uses its own reselected preamble.

[0217] In some embodiments of this disclosure, the first receiving unit 1002 is further configured to:

[0218] The system receives a second indication message from the network device. The second indication message is used to indicate whether different preambles are allowed for each PRACH transmission in the first RO transmission associated with the first SSB.

[0219] In some embodiments of this disclosure, the transmission unit 1001 is further used in at least one of the following steps:

[0220] At least one of the following steps: in response to a second RO transmission at a first time-domain location of a multi-PRACH transmission, each PRACH transmission of the multi-PRACH transmission on the second RO selects to use the same preamble; and

[0221] In response to a multi-PRACH transmission switching from a second RO at a first time domain location to a third RO at a second time domain location, each PRACH transmission of the multi-PRACH transmission on the third RO selects to use a reselected preamble.

[0222] In some embodiments of this disclosure, the transmission unit 1001 is further configured to:

[0223] In response to multiple PRACH transmissions at different ROs at the same time domain location, the first X PRACH transmissions of the multiple PRACH transmissions at the different ROs all select the same first preamble, and each PRACH transmission from the (X+1)th PRACH transmission onwards uses a reselected second preamble; wherein the first preamble and the second preamble are different.

[0224] In some embodiments of this disclosure, the transmission unit 1001 is further configured to:

[0225] In response to multiple PRACH transmissions at different ROs at the same time domain location, each PRACH transmission of the multiple PRACH transmission at the different ROs selects to use a reselected preamble.

[0226] In some embodiments of this disclosure, the transmission unit 1001 is further used in at least one of the following steps:

[0227] In response to multiple PRACH transmissions occurring at different ROs at the first time-domain location of the same SSB, each PRACH transmission in the multiple PRACH transmission at the different ROs selects to use the same preamble; and

[0228] When a multi-PRACH transmission switches from a different RO at the first time domain location of the same SSB to a different RO at the first time domain location, each PRACH transmission of the multi-PRACH transmission on the different RO selects to use the reselected preamble.

[0229] In some embodiments of this disclosure, the first receiving unit 1002 is further configured to:

[0230] The third indication information is received from the network device. The third indication information is used to indicate whether different preambles are allowed for each PRACH transmission at a time-domain location in a multi-PRACH transmission.

[0231] In some embodiments of this disclosure, such as Figure 12 As shown, the multi-PRACH transmission device 1000 further includes a selection unit 1003.

[0232] The selection unit 1003 performs each PRACH transmission in a multi-PRACH transmission, and selects the first preamble to be used for each PRACH transmission from preambleGroup A and / or preamble Group B.

[0233] In some embodiments of this disclosure, the selection unit 1003 is further configured to:

[0234] In response to the RACH configuration of the multiple PRACH transmission including only the configuration of Group A, the first preamble is selected from Group A.

[0235] In some embodiments of this disclosure, the selection unit 1003 is further configured to:

[0236] In response to the RACH configuration of the multiple PRACH transmission including only the configuration of Group B, the first preamble is selected from Group B.

[0237] In some embodiments of this disclosure, the selection unit 1003 is further configured to: select the first preamble from the Group A+Group B in response to a configuration in which the RACH configuration of the multiple PRACH transmission includes a Group A+Group B.

[0238] In some embodiments of this disclosure, the selection unit 1003 selects the first preamble from Group A + Group B, including:

[0239] Determine if the size of msg3 meets the threshold ra-Msg3SizeGroupA;

[0240] If the threshold is met, then the first preamble is selected from Group A;

[0241] If the threshold is not met, then the first preamble is selected from Group B.

[0242] In some embodiments of this disclosure, the selection unit 1003 is further configured to: select the first preamble from Group A in response to the RACH configuration of the multiple PRACH transmission sharing RO with other RACH configurations.

[0243] In some embodiments of this disclosure, the selection unit 1003 is further configured to: in response to the RACH configuration of the multi-PRACH transmission sharing RO with other RACH configurations, and the other RACH configurations including the configuration of Group B, determine to select the first preamble from Group B or Group A according to a fourth indication issued by the network device, wherein the fourth indication information is used to indicate whether the terminal device selects the first preamble from Group B.

[0244] In some embodiments of this disclosure, the RACH configuration for multi-PRACH transmission adopts separate RO with other RACH configurations, and the RACH configuration of the separate RO for multi-PRACH transmission does not include the configuration of Group B.

[0245] In some embodiments of this disclosure, the selection unit 1003 is further configured to, when performing each PRACH transmission in a multi-PRACH transmission, after selecting the first preamble to be used for each PRACH transmission from any of the following Groups, reselect the preamble selected after the first preamble to obtain a reselected preamble, wherein the reselected preamble is selected from the Group to which the first preamble is located, or from other Groups other than the Group to which the first preamble is located.

[0246] In some embodiments of this disclosure, the first receiving unit 1003 is further configured to: receive fifth indication information sent by the network device, the fifth indication information being used to indicate whether the reselection of the preamble needs to be the same Group as the first preamble selection.

[0247] In some embodiments of this disclosure, the selection unit 1003 is further configured to: in response to the fifth indication information indicating that the reselection of the preamble needs to be the same Group as the first preamble selection, reselect the preamble according to the rules of the first preamble selection Group.

[0248] In some embodiments of this disclosure, such as Figure 13 As shown, the multi-PRACH transmission device 1000 is further configured as: a second receiving unit 1004.

[0249] The second receiving unit 1004 is configured to receive the RACH configuration for the multi-PRACH transmission sent by the network device in response to the RACH configuration for the multi-PRACH transmission using separate RO with other RACH configurations. The RACH configuration for the multi-PRACH transmission includes a Group B configuration.

[0250] In some embodiments of this disclosure, the RACH configuration for the multiple PRACH transmission includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, and numberOfRA-PreamblesGroupA.

[0251] In some embodiments of this disclosure, the Group B is configured as a 4-step RA configuration or a 2-step RA configuration.

[0252] In some embodiments of this disclosure, the second receiving unit 1004 is further configured to: receive the RACH configuration of the multi-PRACH transmission sent by the network device when the RACH configuration of the multi-PRACH transmission shares RO with other RACH configurations, wherein the RACH configuration of the multi-PRACH transmission includes a dedicated Group B configuration.

[0253] In some embodiments of this disclosure, the RACH configuration for the dedicated multi-PRACH transport includes one or more of the following:

[0254] ra-Msg3SizeGroupA, messagePowerOffsetGroupB, numberOfRA-PreamblesGroupA.

[0255] In some embodiments of this disclosure, the second receiving unit 1004 is further configured to: receive the RACH configuration for the multi-PRACH transmission issued by the network device in response to the fact that the RACH configuration for the multi-PRACH transmission does not contain a dedicated ra-Msg3SizeGroupA, messagePowerOffsetGroupB, or numberOfRA-PreamblesGroupA, wherein the RACH configuration for the multi-PRACH transmission is the corresponding configuration in the RACH configuration of the shared RO.

[0256] In some embodiments of this disclosure, the dedicated Group B is configured as a 4-step RA configuration or a 2-step RA configuration respectively.

[0257] Some embodiments of this disclosure also provide a multi-PRACH transmission device, such as Figure 14 As shown, the device is applied to network device 1200, and the device includes: receiving unit 1201.

[0258] The receiving unit 1201 is used to receive random access PRACH transmissions from a terminal device, wherein the PRACH transmission is a PRACH transmission in a multi-PRACH transmission sent by the terminal device; wherein the multi-PRACH transmission includes multiple PRACH transmissions, and each PRACH transmission selects to use the same or different preambles, and the preambles come from the same or different preamble groups.

[0259] In some embodiments of this disclosure, such as Figure 15 As shown, the multi-PRACH transmission device 1200 further includes a first transmission unit 1202.

[0260] The first sending unit 1202, in response to determining that the terminal device is performing each PRACH transmission in a multi-PRACH transmission, sends first indication information to the terminal device, the first indication information being used to indicate the preamble used for each PRACH transmission in the multi-PRACH transmission.

[0261] In some embodiments of this disclosure, the first sending unit 1202 is further configured to: in response to each PRACH transmission in the first RO transmission associated with the first SSB, send second indication information to the terminal device, the second indication information being used to indicate whether different preambles are allowed for each PRACH transmission in the first RO transmission associated with the first SSB.

[0262] In some embodiments of this disclosure, the first sending unit 1202 is further configured to: in response to each PRACH transmission at a time-domain location in a multi-PRACH transmission, send third indication information to the terminal device, the third indication information being used to indicate whether different preambles are allowed for each PRACH transmission at a time-domain location in a multi-PRACH transmission.

[0263] In some embodiments of this disclosure, the first sending unit 1202 is further configured to: in response to a RACH configuration for multiple PRACH transmissions sharing RO with other RACH configurations, and the other RACH configurations including the configuration of Group B, send a fourth indication information to the terminal device, the fourth indication information being used to indicate whether the terminal device selects the first preamble from the Group B.

[0264] In some embodiments of this disclosure, the first sending unit 1202 is further configured to: send a fifth indication message to the terminal device, the fifth indication message being used to indicate whether the reselection of the preamble needs to be the same as the selection of the preamble group during the first preamble selection.

[0265] In some embodiments of this disclosure, the multi-PRACH transmission device, such as Figure 16 As shown, it also includes: a second transmitting unit 1203.

[0266] The second sending unit 1203 is used to send the RACH configuration for the multi-PRACH transmission to the terminal device in response to the RACH configuration for the multi-PRACH transmission using separate RO with other RACH configurations. The RACH configuration for the multi-PRACH transmission includes a Group B configuration.

[0267] In some embodiments of this disclosure, the RACH configuration for the multiple PRACH transmission includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, and numberOfRA-PreamblesGroupA.

[0268] In some embodiments of this disclosure, the Group B is configured as a 4-step RA configuration or a 2-step RA configuration.

[0269] In some embodiments of this disclosure, the second sending unit 1203 is further configured to: send the RACH configuration of the multi-PRACH transmission to the terminal device in response to the RACH configuration of the multi-PRACH transmission sharing RO with other RACH configurations, wherein the RACH configuration of the multi-PRACH transmission includes a dedicated Group B configuration.

[0270] In some embodiments of this disclosure, the RACH configuration for the dedicated multi-PRACH transport includes one or more of the following:

[0271] ra-Msg3SizeGroupA, messagePowerOffsetGroupB, numberOfRA-PreamblesGroupA.

[0272] In some embodiments of this disclosure, the second transmitting unit 1203 is further configured to:

[0273] In response to the fact that the RACH configuration for the multiple PRACH transmission does not include a dedicated ra-Msg3SizeGroupA, messagePowerOffsetGroupB, or numberOfRA-PreamblesGroupA, the RACH configuration for the multiple PRACH transmission is sent to the terminal device. The RACH configuration for the multiple PRACH transmission is the corresponding configuration in the RACH configuration of the shared RO.

[0274] In some embodiments of this disclosure, the Group B is configured as a 4-step RA configuration or a 2-step RA configuration.

[0275] This disclosure provides a multi-PRACH transmission apparatus. During each PRACH transmission in a multi-PRACH transmission, the PRACH transmission can choose to use the same or different preambles. The preambles can also come from the same or different preamble groups. This provides a solution for selecting preambles and groups in multi-PRACH transmission, ensuring the normal and orderly transmission of multi-PRACH.

[0276] Please see the figure. Figure 17This is a schematic diagram of the structure of a communication device 1300 provided in an embodiment of this application. The communication device 1300 can be a network device, a user equipment, a chip, chip system, or processor that supports the network device in implementing the above methods, or a chip, chip system, or processor that supports the user equipment in implementing the above methods. This device can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0277] The communication device 1300 may include one or more processors 1301. The processor 1301 may be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control the communication device (e.g., base station, baseband chip, terminal equipment, terminal equipment chip, DU or CU, etc.), execute computer programs, and process data from the computer programs.

[0278] Optionally, the communication device 1300 may further include one or more memories 1302, which may store a computer program 1304. The processor 1301 executes the computer program 1304 to cause the communication device 1300 to perform the methods described in the above method embodiments. Optionally, the memory 1302 may also store data. The communication device 1300 and the memory 1302 may be provided separately or integrated together.

[0279] Optionally, the communication device 1300 may also include a transceiver 1305 and an antenna 1306. The transceiver 1305 may be referred to as a transceiver unit, transceiver, or transceiver circuit, etc., and is used to implement the transmission and reception functions. The transceiver 1305 may include a receiver and a transmitter. The receiver may be referred to as a receiver or receiving circuit, etc., and is used to implement the receiving function; the transmitter may be referred to as a transmitter or transmitting circuit, etc., and is used to implement the transmitting function.

[0280] Optionally, the communication device 1300 may further include one or more interface circuits 1307. The interface circuits 1307 are used to receive code instructions and transmit them to the processor 1301. The processor 1301 executes the code instructions to cause the communication device 1300 to perform the methods described in the above method embodiments.

[0281] In one implementation, the processor 1301 may include a transceiver for implementing receive and transmit functions. For example, the transceiver may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing receive and transmit functions may be separate or integrated. The aforementioned transceiver circuit, interface, or interface circuit can be used for reading and writing code / data, or it can be used for transmitting or relaying signals.

[0282] In one implementation, processor 1301 may store computer program 1303, which runs on processor 1301 and causes communication device 1300 to perform the methods described in the above method embodiments. Computer program 1303 may be embedded in processor 1301, in which case processor 1301 may be implemented in hardware.

[0283] In one implementation, the communication device 1300 may include circuitry capable of performing the functions of transmitting, receiving, or communicating as described in the aforementioned method embodiments. The processor and transceiver described in this application can be implemented on integrated circuits (ICs), analog ICs, radio frequency integrated circuits (RFICs), mixed-signal ICs, application-specific integrated circuits (ASICs), printed circuit boards (PCBs), electronic devices, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal oxide semiconductors (CMOS), n-metal-oxide-semiconductor (NMOS), positive-channel metal oxide semiconductors (PMOS), bipolar junction transistors (BJTs), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0284] The communication device described in the above embodiments may be a network device or a user equipment, but the scope of the communication device described in this application is not limited thereto, and the structure of the communication device may vary. Figure 16 The communication device can be a standalone device or part of a larger device. For example, the communication device could be:

[0285] (1) Independent integrated circuit IC, or chip, or chip system or subsystem;

[0286] (2) A collection of one or more ICs, optionally including storage components for storing data and computer programs;

[0287] (3) ASIC, such as modem;

[0288] (4) Modules that can be embedded in other devices;

[0289] (5) Receivers, terminal equipment, smart terminal equipment, cellular phones, wireless equipment, handheld devices, mobile units, vehicle-mounted equipment, network equipment, cloud equipment, artificial intelligence equipment, etc.

[0290] (6) Others, etc.

[0291] For cases where the communication device can be a chip or a chip system, please refer to [link / reference]. Figure 18 The diagram shows the structure of the chip. Figure 18 The chip shown includes a processor 1401 and an interface 1402. There can be one or more processors 1401, and multiple interfaces 1402.

[0292] Optionally, the chip also includes a memory 1403 for storing necessary computer programs and data.

[0293] Those skilled in the art will also understand that the various illustrative logical blocks and steps listed in the embodiments of this application can be implemented by electronic hardware, computer software, or a combination of both. Whether such functionality is implemented through hardware or software depends on the specific application and the overall system design requirements. Those skilled in the art can implement the functionality using various methods for each specific application, but such implementation should not be construed as exceeding the scope of protection of the embodiments of this application.

[0294] This application also provides a readable storage medium having instructions stored thereon that, when executed by a computer, implement the functions of any of the above method embodiments.

[0295] This application also provides a computer program product that, when executed by a computer, implements the functions of any of the above method embodiments.

[0296] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer programs. When a computer program is loaded and executed on a computer, it generates, in whole or in part, the processes or functions according to the embodiments of this application. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, a computer program can be transferred from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., high-density digital video discs (DVDs)), or semiconductor media (e.g., solid-state disks (SSDs)).

[0297] Those skilled in the art will understand that the various numerical designations such as "first," "second," etc., involved in this application are merely for the convenience of description and are not intended to limit the scope of the embodiments of this application, nor do they indicate the order of sequence.

[0298] At least one in this application can also be described as one or more, and multiple can be two, three, four or more, and this application does not impose any limitation. In the embodiments of this application, for a technical feature, the technical features in that technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", and there is no order or size among the technical features described by "first", "second", "third", "A", "B", "C" and "D".

[0299] As used herein, the terms "machine-readable medium" and "computer-readable medium" refer to any computer program product, device, and / or apparatus (e.g., disk, optical disk, memory, programmable logic device (PLD)) used to provide machine instructions and / or data to a programmable processor, including machine-readable media that receive machine instructions as machine-readable signals. The term "machine-readable signal" refers to any signal used to provide machine instructions and / or data to a programmable processor.

[0300] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as a data server), or computing systems that include middleware components (e.g., an application server), or computing systems that include frontend components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with embodiments of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., a communication network). Examples of communication networks include local area networks (LANs), wide area networks (WANs), and the Internet.

[0301] Computer systems can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. Client-server relationships are created by computer programs running on the respective computers and having a client-server relationship with each other.

[0302] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this is not limited herein.

[0303] Furthermore, it should be understood that the various embodiments of this application can be implemented individually or in combination with other embodiments, where the scheme allows.

[0304] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0305] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0306] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0307] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for transmitting data via a multi-physical random access channel (PRACH), characterized in that, The method is applied to a terminal device, and the method includes: In each PRACH transmission in a multi-PRACH transmission, the preamble to be used in each PRACH transmission is determined, and the preamble comes from the same preamble group. The selection of the same preamble for each PRACH transmission includes: in response to a first RO transmission associated with a first SSB for a multi-PRACH transmission, each PRACH transmission of a multi-PRACH transmission on the first RO selects to use the preamble selected by the first PRACH transmission on the first SSB. The method further includes: Perform each PRACH transmission in a multi-PRACH transmission, selecting the first preamble to use from preamble Group A and / or preamble Group B for each PRACH transmission; In response to the RACH configuration of the multi-PRACH transmission using separate RO with other RACH configurations, the network device receives the RACH configuration of the multi-PRACH transmission, which includes a Group B configuration.

2. The method according to claim 1, characterized in that, in, Each PRACH transmission in a multi-PRACH transmission uses the same preamble, and each PRACH transmission selects the preamble chosen by the first PRACH transmission in the single multi-PRACH transmission.

3. The method according to claim 1 or 2, characterized in that, The determination of the preamble used in each PRACH transmission includes: The system receives a first indication message from a network device, the first indication message being used to indicate the preamble used by each PRACH transmission in the multi-PRACH transmission.

4. The method according to claim 3, characterized in that, The method further includes: In response to determining, according to the communication protocol or the first indication information, that each PRACH transmission in the multi-PRACH transmission is not allowed to use different preambles, the respective PRACH transmissions in the multi-PRACH transmission are executed accordingly, wherein each PRACH transmission selects to use the same preamble.

5. The method according to claim 1, characterized in that, The method further includes: In response to a multi-PRACH transmission switching from a first RO associated with the first SSB to a second RO associated with the second SSB, each PRACH transmission of the multi-PRACH transmission on the second RO selects to use a reselected preamble.

6. The method according to any one of claims 1-5, characterized in that, The method further includes: The system receives a second indication message from the network device, which is used to determine the preamble used by each PRACH transmission in the first RO transmission associated with the first SSB.

7. The method according to claim 1, characterized in that, The method further includes at least one of the following steps: In response to a second RO transmission of a multi-PRACH transmission at the first time-domain location, each PRACH transmission of the multi-PRACH transmission on the second RO selects to use the same preamble; as well as In response to a multi-PRACH transmission switching from a second RO at a first time domain location to a third RO at a second time domain location, each PRACH transmission of the multi-PRACH transmission on the third RO selects to use a reselected preamble.

8. The method according to claim 1, characterized in that, The method further includes: The third indication information is received from the network device. The third indication information is used to indicate whether different preambles are allowed for each PRACH transmission at a time-domain location in a multi-PRACH transmission.

9. The method according to claim 1, characterized in that, The selection of the first preamble used for each PRACH transport selection from preamble Group A and / or preamble Group B includes: In response to the configuration of Group A and Group B in the RACH configuration of the multi-PRACH transmission, it is determined whether the size of msg3 meets the threshold ra-Msg3SizeGroupA; if the threshold is met, the first preamble is selected from Group A; if the threshold is not met, the first preamble is selected from Group B.

10. The method according to claim 1, characterized in that, The selection of the first preamble for each PRACH transport from preamble Group A and / or preamble Group B includes: In response to the RACH configuration of the multiple PRACH transmission including only the configuration of Group A, the first preamble is selected from Group A; In response to the RACH configuration of the multiple PRACH transmission including only the configuration of Group B, the first preamble is selected from Group B; In response to the configuration of Group A and Group B in the RACH configuration of the multiple PRACH transmission, the first preamble is selected from Group A and Group B; In response to the RACH configuration of the multi-PRACH transmission sharing the RO with other RACH configurations, the first preamble is selected from Group A; and In response to the RACH configuration of the multi-PRACH transmission sharing RO with other RACH configurations, and the other RACH configurations including the Group B configuration, the terminal device determines whether to select the first preamble from Group B or Group A based on the fourth indication information issued by the network device. The fourth indication information is used to indicate whether the terminal device selects the first preamble from Group B.

11. The method according to claim 1, characterized in that, The method further includes: The RACH configuration for the multi-PRACH transmission uses the separateRO timeline for independent random access channels, and the separateRO RACH configuration for the multi-PRACH transmission does not include the Group B configuration.

12. The method according to any one of claims 1-11, characterized in that, The method also includes: The preamble selected after the first preamble selection is reselected to obtain a reselected preamble. The reselected preamble is selected from the same group as the first preamble, or from other groups besides the group of the first preamble.

13. The method according to claim 12, characterized in that, The method further includes: The network device receives a fifth instruction message, which is used to determine whether the reselection of the preamble needs to be the same group as the first preamble selection.

14. The method according to claim 13, characterized in that, The method further includes: In response to the determination based on the fifth instruction information that the reselection of the preamble needs to be the same group as the first preamble selection, the reselection of the preamble is performed according to the rules of the first preamble selection group.

15. The method according to claim 1, characterized in that, The method further includes: In response to the RACH configuration of the multi-PRACH transmission sharing RO with other RACH configurations, the network device receives the RACH configuration of the multi-PRACH transmission sent by the network device, wherein the RACH configuration of the multi-PRACH transmission includes a dedicated Group B configuration.

16. The method according to claim 1, characterized in that, The RACH configuration for the multi-PRACH transmission includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, numberOfRA-PreamblesGroupA.

17. The method according to claim 1, characterized in that, The method further includes: In response to the fact that the RACH configuration for the multiple PRACH transmission does not include a dedicated ra-Msg3SizeGroupA, messagePowerOffsetGroupB, or numberOfRA-PreamblesGroupA, the RACH configuration for the multiple PRACH transmission sent by the network device is received. The RACH configuration for the multiple PRACH transmission is the corresponding configuration in the RACH configuration of the shared RO.

18. The method according to claim 15 or 17, characterized in that, The Group B is configured as either a 4-step RA configuration or a 2-step RA configuration.

19. A method for transmitting data via a multi-physical random access channel (PRACH), characterized in that, The method is applied to a network device, and the method includes: Each PRACH transmission in the multiple random access PRACH transmission of the receiving terminal device, wherein the preamble selected for each PRACH transmission comes from the same preamble group; The selection of the same preamble for each PRACH transmission includes: in response to a first RO transmission associated with a first SSB for a multi-PRACH transmission, each PRACH transmission of a multi-PRACH transmission on the first RO selects to use the preamble selected by the first PRACH transmission on the first SSB. The method further includes: In response to the RACH configuration of the multi-PRACH transmission using separate RO with other RACH configurations, the RACH configuration of the multi-PRACH transmission is sent to the terminal device, wherein the RACH configuration of the multi-PRACH transmission includes a Group B configuration.

20. The method according to claim 19, characterized in that, The method further includes: In response to determining that the terminal device is performing each PRACH transmission in a multi-PRACH transmission, a first indication message is sent to the terminal device, the first indication message being used to indicate the preamble used for each PRACH transmission in the multi-PRACH transmission.

21. The method according to claim 19, characterized in that, The method further includes: In response to each PRACH transmission in the first RO transmission associated with the first SSB, a second indication message is sent to the terminal device. The second indication message is used to indicate whether different preambles are allowed for each PRACH transmission in the first RO transmission associated with the first SSB.

22. The method according to claim 19, characterized in that, The method further includes: In response to each PRACH transmission at a time-domain location in a multi-PRACH transmission, a third indication information is sent to the terminal device, the third indication information being used to indicate whether different preambles are allowed for each PRACH transmission at a time-domain location in the multi-PRACH transmission.

23. The method according to claim 19, characterized in that, The method further includes: In response to a RACH configuration for multiple PRACH transmissions sharing the RO with other RACH configurations, and the other RACH configurations including the Group B configuration, a fourth indication message is sent to the terminal device, the fourth indication message being used to indicate whether the terminal device should select the first preamble from the Group B.

24. The method according to claim 19, characterized in that, The method further includes: A fifth instruction message is sent to the terminal device, which is used to indicate whether the reselection of the preamble needs to be the same as the selection of the preamble group during the first selection.

25. The method according to claim 19, characterized in that, The RACH configuration for the multi-PRACH transmission includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, numberOfRA-PreamblesGroupA.

26. The method according to any one of claims 19-24, characterized in that, The method further includes: In response to the RACH configuration of the multi-PRACH transmission sharing RO with other RACH configurations, the RACH configuration of the multi-PRACH transmission is sent to the terminal device, wherein the RACH configuration of the multi-PRACH transmission includes a dedicated Group B configuration.

27. The method according to claim 26, characterized in that, The RACH configuration for the multi-PRACH transmission includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, numberOfRA-PreamblesGroupA.

28. The method according to claim 27, characterized in that, The method further includes: In response to the fact that the RACH configuration for the multiple PRACH transmission does not include a dedicated ra-Msg3SizeGroupA, messagePowerOffsetGroupB, or numberOfRA-PreamblesGroupA, the RACH configuration for the multiple PRACH transmission is sent to the terminal device. The RACH configuration for the multiple PRACH transmission is the corresponding configuration in the RACH configuration of the shared RO.

29. The method according to claim 26 or 28, characterized in that, The Group B is configured as either a 4-step RA configuration or a 2-step RA configuration.

30. A multi-physical random access channel (PRACH) transmission apparatus, characterized in that, The device is used in a terminal device, and the device includes: The transmission unit is used to perform each PRACH transmission in a multi-PRACH transmission and to determine the preamble to be used in each PRACH transmission, wherein the preamble comes from the same preamble group. The selection of the same preamble for each PRACH transmission includes: in response to a first RO transmission associated with a first SSB for a multi-PRACH transmission, each PRACH transmission of a multi-PRACH transmission on the first RO selects to use the preamble selected by the first PRACH transmission on the first SSB. The multi-PRACH transmission device further includes a selection unit, which is used for: Perform each PRACH transmission in a multi-PRACH transmission, selecting the first preamble to use from preamble Group A and / or preamble Group B for each PRACH transmission; In response to the RACH configuration of the multi-PRACH transmission using separate RO with other RACH configurations, the network device receives the RACH configuration of the multi-PRACH transmission, which includes a Group B configuration.

31. The multi-physical random access channel (PRACH) transmission apparatus according to claim 30, characterized in that, The transmission unit is further configured to: use the same preamble for each PRACH transmission in a multi-PRACH transmission, and each PRACH transmission selects the preamble selected by the first PRACH transmission in the single multi-PRACH transmission.

32. The multi-physical random access channel (PRACH) transmission apparatus according to claim 30, characterized in that, The multi-PRACH transmission device further includes a first receiving unit, which is used to receive second indication information sent by the network device. The second indication information is used to determine the preamble used by each PRACH transmission in the first RO transmission associated with the first SSB.

33. The multi-physical random access channel (PRACH) transmission apparatus according to claim 30, characterized in that, The selection unit is also used for: In response to the configuration of Group A and Group B in the RACH configuration of the multi-PRACH transmission, it is determined whether the size of msg3 meets the threshold ra-Msg3SizeGroupA; if the threshold is met, the first preamble is selected from Group A; if the threshold is not met, the first preamble is selected from Group B.

34. The multi-physical random access channel (PRACH) transmission apparatus according to claim 30, characterized in that, The selection unit is also used for: In response to the RACH configuration of the multiple PRACH transmission including only the configuration of Group A, the first preamble is selected from Group A; In response to the RACH configuration of the multiple PRACH transmission including only the configuration of Group B, the first preamble is selected from Group B; In response to the configuration of Group A and Group B in the RACH configuration of the multiple PRACH transmission, the first preamble is selected from Group A and Group B; In response to the RACH configuration of the multi-PRACH transmission sharing the RO with other RACH configurations, the first preamble is selected from Group A; and In response to the RACH configuration of the multi-PRACH transmission sharing RO with other RACH configurations, and the other RACH configurations including the Group B configuration, the terminal device determines whether to select the first preamble from Group B or Group A based on the fourth indication information issued by the network device. The fourth indication information is used to indicate whether the terminal device selects the first preamble from Group B.

35. The multi-physical random access channel (PRACH) transmission apparatus according to claim 30, characterized in that, The RACH configuration for the multi-PRACH transmission uses the separateRO timeline for independent random access channels, and the separateRO RACH configuration for the multi-PRACH transmission does not include the Group B configuration.

36. The multi-physical random access channel (PRACH) transmission apparatus according to any one of claims 30-35, characterized in that, The selection unit is also used for: The preamble selected after the first preamble selection is reselected to obtain a reselected preamble. The reselected preamble is selected from the same group as the first preamble, or from other groups besides the group of the first preamble.

37. The multi-physical random access channel (PRACH) transmission apparatus according to claim 30, characterized in that, The multi-PRACH transmission device further includes a second receiving unit, the second receiving unit being used for: In response to the RACH configuration of the multi-PRACH transmission sharing RO with other RACH configurations, the network device receives the RACH configuration of the multi-PRACH transmission sent by the network device, wherein the RACH configuration of the multi-PRACH transmission includes a dedicated Group B configuration.

38. The multi-physical random access channel (PRACH) transmission apparatus according to claim 30, characterized in that, The RACH configuration for the multi-PRACH transmission includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, numberOfRA-PreamblesGroupA.

39. The multi-physical random access channel (PRACH) transmission apparatus according to claim 37, characterized in that, The second receiving unit is also used for: In response to the fact that the RACH configuration for the multiple PRACH transmission does not include a dedicated ra-Msg3SizeGroupA, messagePowerOffsetGroupB, or numberOfRA-PreamblesGroupA, the RACH configuration for the multiple PRACH transmission sent by the network device is received. The RACH configuration for the multiple PRACH transmission is the corresponding configuration in the RACH configuration of the shared RO.

40. The multi-physical random access channel (PRACH) transmission apparatus according to claim 37 or 39, characterized in that, The Group B is configured as either a 4-step RA configuration or a 2-step RA configuration.

41. A multi-physical random access channel (PRACH) transmission apparatus, characterized in that, The device is used in a network device, and the device includes: The receiving unit is used to receive each PRACH transmission in the multiple random access PRACH transmission of the terminal device, wherein the preamble selected by each PRACH transmission comes from the same preamble group. The selection of the same preamble for each PRACH transmission includes: in response to a first RO transmission associated with a first SSB for a multi-PRACH transmission, each PRACH transmission of a multi-PRACH transmission on the first RO selects to use the preamble selected by the first PRACH transmission on the first SSB. The multi-PRACH transmission device further includes a second transmitting unit, the second transmitting unit being used for: In response to the RACH configuration of the multi-PRACH transmission using separate RO with other RACH configurations, the RACH configuration of the multi-PRACH transmission is sent to the terminal device, wherein the RACH configuration of the multi-PRACH transmission includes a Group B configuration.

42. The multi-physical random access channel (PRACH) transmission apparatus according to claim 41, characterized in that, The multi-PRACH transmission device further includes a first transmitting unit, the first transmitting unit being used for: In response to each PRACH transmission in the first RO transmission associated with the first SSB, a second indication message is sent to the terminal device. The second indication message is used to indicate whether different preambles are allowed for each PRACH transmission in the first RO transmission associated with the first SSB.

43. The multi-physical random access channel (PRACH) transmission apparatus according to claim 41, characterized in that, The multi-PRACH transmission device further includes a first transmitting unit, which is further configured to: In response to a RACH configuration for multiple PRACH transmissions sharing the RO with other RACH configurations, and the other RACH configurations including the Group B configuration, a fourth indication message is sent to the terminal device, the fourth indication message being used to indicate whether the terminal device should select the first preamble from the Group B.

44. The multi-physical random access channel (PRACH) transmission apparatus according to claim 41, characterized in that, The RACH configuration for the multi-PRACH transmission includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, numberOfRA-PreamblesGroupA.

45. The multi-physical random access channel (PRACH) transmission apparatus according to any one of claims 41-43, characterized in that, The second transmitting unit is further configured to: In response to the RACH configuration of the multi-PRACH transmission sharing RO with other RACH configurations, the RACH configuration of the multi-PRACH transmission is sent to the terminal device, wherein the RACH configuration of the multi-PRACH transmission includes a dedicated Group B configuration.

46. ​​The multi-physical random access channel (PRACH) transmission apparatus according to claim 41, characterized in that, The RACH configuration for the multi-PRACH transmission includes one or more of the following: ra-Msg3SizeGroupA, messagePowerOffsetGroupB, numberOfRA-PreamblesGroupA.

47. The multi-physical random access channel (PRACH) transmission apparatus according to claim 46, characterized in that, The second transmitting unit is further configured to: In response to the fact that the RACH configuration for the multiple PRACH transmission does not include a dedicated ra-Msg3SizeGroupA, messagePowerOffsetGroupB, or numberOfRA-PreamblesGroupA, the RACH configuration for the multiple PRACH transmission is sent to the terminal device. The RACH configuration for the multiple PRACH transmission is the corresponding configuration in the RACH configuration of the shared RO.

48. The multi-physical random access channel (PRACH) transmission apparatus according to claim 45 or 47, characterized in that, The Group B is configured as either a 4-step RA configuration or a 2-step RA configuration.

49. A communication device, wherein, include: transceiver; Memory; The processor is connected to the transceiver and the memory respectively, and is configured to control the wireless signal transmission and reception of the transceiver by executing computer-executable instructions on the memory, and is capable of implementing the method of any one of claims 1-18 or the method of any one of claims 19-29.

50. A computer storage medium, wherein, The computer storage medium stores computer-executable instructions; when executed by a processor, the computer-executable instructions can implement the method of any one of claims 1-18 or the method of any one of claims 19-29.

51. A computer program product comprising a computer program that, when executed, implements the method of any one of claims 1-18 or the method of any one of claims 19-29.

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