Random access method, apparatus, terminal and network side device

Abstract

The application discloses a random access method and device, a terminal and a network side equipment, and belongs to the technical field of communication. The random access method comprises the following steps: a terminal device sends a plurality of physical random access channel (PRACH) signals; a plurality of PRACH resources used by the plurality of PRACH signals correspond to a plurality of different downlink reference signals respectively; wherein a target PRACH resource in the plurality of PRACH resources used by the plurality of PRACH signals is associated with a quasi co-location signal; the quasi co-location signal is one or more of the plurality of different downlink reference signals; the quasi co-location signal is used for receiving a first downlink signal by the terminal device, and the first downlink signal is a Msg2 message or Msg3 retransmission scheduling information or a Msg4 message.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to a random access method, apparatus, terminal, and network-side equipment. Background Technology

[0002] To enhance the coverage performance of the Physical Random Access Channel (PRACH) signal, a technique for transmitting the PRACH signal multiple times can be introduced.

[0003] When a PRACH signal is transmitted multiple times, each PRACH signal can be associated with a different downlink reference signal or synchronization signal block (SSB). That is, each PRACH signal is transmitted based on the RO resources (time-frequency resources or preamble resources) corresponding to different SSBs. Therefore, the terminal and network-side equipment need to determine the retransmission scheduling information of downlink signal Msg2 or Msg3 (i.e., DCI 0-0 scrambled by TC-RNTI) or the quasi-coloated (QCL) signal of Msg4. If the terminal and network-side equipment do not understand the quasi-coloated signal in a consistent way, it will lead to downlink signal transmission failure. Summary of the Invention

[0004] This application provides a random access method, apparatus, terminal, and network-side device that can solve the problem of downlink signal transmission failure caused by inconsistent understanding of alignment co-address signals between the terminal and the network-side device when PRACH signals are transmitted multiple times.

[0005] Firstly, a random access method is provided for use in a terminal, the method comprising:

[0006] The terminal device sends multiple Physical Random Access Channel (PRACH) signals, and the multiple PRACH resources used by the multiple PRACH signals correspond to multiple different downlink reference signals;

[0007] Wherein, the target PRACH resource among the multiple PRACH resources used by the multiple PRACH signals is associated with a quasi-co-located signal; the quasi-co-located signal is one or more of the multiple different downlink reference signals; the quasi-co-located signal is used by the terminal device to receive a first downlink signal, the first downlink signal being a Msg2 message or a Msg3 retransmission scheduling information or a Msg4 message.

[0008] Secondly, a random access method is provided for application in network-side devices, the method comprising:

[0009] The network-side device receives multiple PRACH signals, and the multiple PRACH resources used by the multiple PRACH signals are respectively associated with multiple different downlink reference signals; wherein, the target PRACH resource among the multiple PRACH resources is associated with a quasi-co-address signal; the quasi-co-address signal is one or more of the multiple different downlink reference signals;

[0010] The network-side device determines the quasi-co-address signal of the first downlink signal based on the target PRACH resource;

[0011] The first downlink signal is either Msg2 message, Msg3 retransmission scheduling information, or Msg4 message.

[0012] Thirdly, a random access device is provided, the device comprising:

[0013] The first transmitting module is used to transmit multiple Physical Random Access Channel (PRACH) signals, wherein the multiple PRACH resources used by the multiple PRACH signals correspond to multiple different downlink reference signals.

[0014] Wherein, the target PRACH resource among the multiple PRACH resources used by the multiple PRACH signals is associated with a quasi-co-located signal; the quasi-co-located signal is one or more of the multiple different downlink reference signals; the quasi-co-located signal is used by the terminal device to receive a first downlink signal, the first downlink signal being a Msg2 message or a Msg3 retransmission scheduling information or a Msg4 message.

[0015] Fourthly, a random access device is provided, the device comprising:

[0016] A first receiving module is configured to receive multiple PRACH signals, wherein the multiple PRACH signals use multiple PRACH resources that are respectively associated with multiple different downlink reference signals; wherein, a target PRACH resource among the multiple PRACH resources is associated with a quasi-co-address signal; the quasi-co-address signal is one or more of the multiple different downlink reference signals;

[0017] The fourth determining module is used to determine the quasi-co-address signal of the first downlink signal based on the target PRACH resource;

[0018] The first downlink signal is either Msg2 message, Msg3 retransmission scheduling information, or Msg4 message.

[0019] Fifthly, a terminal is provided, the terminal including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the method described in the first aspect.

[0020] Sixthly, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used for:

[0021] Multiple Physical Random Access Channel (PRACH) signals are transmitted, wherein the multiple PRACH resources used by the multiple PRACH signals correspond to multiple different downlink reference signals;

[0022] Wherein, the target PRACH resource among the multiple PRACH resources used by the multiple PRACH signals is associated with a quasi-co-located signal; the quasi-co-located signal is one or more of the multiple different downlink reference signals; the quasi-co-located signal is used by the terminal device to receive a first downlink signal, the first downlink signal being a Msg2 message or a Msg3 retransmission scheduling information or a Msg4 message.

[0023] In a seventh aspect, a network-side device is provided, the network-side device including a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the method as described in the second aspect.

[0024] Eighthly, a network-side device is provided, including a processor and a communication interface, wherein the communication interface is used for:

[0025] Receive multiple PRACH signals, wherein the multiple PRACH resources used by the multiple PRACH signals are respectively associated with multiple different downlink reference signals; wherein, the target PRACH resource among the multiple PRACH resources is associated with a quasi-co-located signal; the quasi-co-located signal is one or more of the multiple different downlink reference signals;

[0026] The processor is used for:

[0027] Based on the target PRACH resource, determine the quasi-co-address signal of the first downlink signal;

[0028] The first downlink signal is either Msg2 message, Msg3 retransmission scheduling information, or Msg4 message.

[0029] A ninth aspect provides a readable storage medium on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect, or implement the steps of the method described in the second aspect.

[0030] In a tenth aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run a program or instructions to implement the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0031] Eleventhly, a computer program / program product is provided, the computer program / program product being stored in a non-transient storage medium, the program / program product being executed by at least one processor to implement the steps of the method as described in the first aspect, or to implement the steps of the method as described in the second aspect.

[0032] In this embodiment, by associating the target PRACH resource among the multiple PRACH resources used by the transmitted multiple PRACH signals with a quasi-co-address signal, multiple PRACHs can be transmitted using the target PRACH resource to indicate the quasi-co-address signal associated with the target PRACH resource. This ensures that the terminal and network-side equipment have a consistent understanding of the quasi-co-address signal, thereby effectively guaranteeing the successful transmission of downlink signals. Attached Figure Description

[0033] Figure 1 This diagram illustrates a structural diagram of a wireless communication system applicable to embodiments of this application;

[0034] Figure 2 This is one of the schematic diagrams of the random access procedure provided in the embodiments of this application;

[0035] Figure 3 This is the second schematic diagram of the random access procedure provided in the embodiments of this application;

[0036] Figure 4 This is the third schematic diagram of the random access procedure provided in the embodiments of this application;

[0037] Figure 5 This is the fourth schematic diagram of the random access procedure provided in the embodiments of this application;

[0038] Figure 6 This is one of the schematic diagrams of the transmission beam of the PRACH signal provided in the embodiments of this application;

[0039] Figure 7 This is the second schematic diagram of the transmission beam of the PRACH signal provided in the embodiments of this application;

[0040] Figure 8 This is a schematic diagram of the signal quality corresponding to the transmission beam of the PRACH signal provided in the embodiments of this application;

[0041] Figure 9 This is one of the flowcharts illustrating the random access method provided in the embodiments of this application;

[0042] Figure 10 This is a second schematic flowchart of the random access method provided in the embodiments of this application;

[0043] Figure 11 This is one of the structural schematic diagrams of the random access device provided in the embodiments of this application;

[0044] Figure 12 This is a second schematic diagram of the structure of the random access device provided in the embodiments of this application;

[0045] Figure 13 This is a schematic diagram of the structure of the communication device provided in the embodiments of this application;

[0046] Figure 14 A schematic diagram of the hardware structure of the terminal device for implementing the embodiments of this application;

[0047] Figure 15 A schematic diagram of the hardware structure of the network-side device to implement the embodiments of this application. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0049] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0050] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used with the systems and radio technologies mentioned above, as well as with other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to applications other than NR systems, such as 6th generation (6G) radio systems. th Generation 6G communication system.

[0051] Figure 1This diagram illustrates a structural diagram of a wireless communication system applicable to embodiments of this application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can also be referred to as a terminal device or user equipment (UE). The terminal 11 can be a mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), wearable device, vehicle-mounted device (VUE), pedestrian terminal (PUE), etc. Wearable devices include smartwatches, wristbands, headphones, glasses, etc. It should be noted that this application does not limit the specific type of terminal 11. Network-side device 12 can be a base station or a core network. The base station can be referred to as a node B, evolved node B, access point, base transceiver station (BTS), radio base station, radio transceiver, basic service set (BSS), extended service set (ESS), B node, evolved B node (eNB), home B node, home evolved B node, WLAN access point, WiFi node, transmitting and receiving point (TRP), or any other suitable term in the field, as long as the same technical effect is achieved. The base station is not limited to specific technical terms. It should be noted that in this application embodiment, only the base station in the NR system is used as an example, but the specific type of base station is not limited.

[0052] To facilitate a clearer understanding of the various embodiments of this application, some relevant background knowledge will be introduced as follows.

[0053] (1) Random access procedure;

[0054] In the existing technology, NR supports two types of random access procedures: the 4-step Random Access (RA) type (4-step Physical Random Access Channel (RACH)) for Msg1 and the 2-step RA type (2-step RACH) for MsgA.

[0055] Figure 2 This is one of the schematic diagrams of the random access procedure provided in the embodiments of this application. Figure 3 This is the second schematic diagram of the random access procedure provided in the embodiments of this application. Figure 4 This is the third schematic diagram of the random access procedure provided in the embodiments of this application. Figure 5 This is the fourth schematic diagram of the random access procedure provided in the embodiments of this application, such as... Figure 2-5 As shown, both types of RA procedures support contention-based random access (CBRA) and contention-free random access (CFRA). The 2-step RACH procedure is generally used in areas with good coverage to shorten terminal access time. For areas with poor signal coverage, terminals should use the 4-step RACH procedure to access the cell.

[0056] In 4-step RACH, the User Equipment (UE) first sends Msg1, which includes a preamble, to the network-side equipment. After sending the preamble, the UE will listen to the Physical Downlink Control Channel (PDCCH) within the Random Access Response window (RAR) and receive the Random Access Response (RAR) scrambled with the Radio Network Temporary Identifier (RA-RNTI) scheduled by DCI format 1_0. If the preamble index in the RAR is the same as the preamble index of the UE sending Msg1, then the RAR is considered successfully received. At this point, the UE can stop listening to the RAR and send Msg3 according to the UL grant instruction carried in the RAR. Msg3 is transmitted on the Uplink Shared Channel (UL-SCH) and uses Hybrid Automatic Repeat Request (HARQ). The PDCCH is scrambled with the TC-RNTI indicated by the RAR, and the retransmission of Msg3 is scheduled using DCI format 0_0. Msg3 contains a unique identifier for the UE, which will be used for conflict resolution in step 4. After receiving Msg3, the network-side device will schedule Msg4 using the PDCCH scrambled with TC-RNTI. When the UE successfully decodes the UE Contention Resolution Identity MAC control element contained in Msg4 and finds that it matches the UE Contention Resolution Identity sent by Msg3, the UE confirms that the random access is successful and sets the C-RNTI to TC-RNTI, thus completing the 4-step random access process.

[0057] (2) Method for selecting the SSB associated with the PRACH signal;

[0058] The method for selecting the associated SSB for the PRACH signal is as follows: After completing the synchronization process, the terminal receives and detects all SSB signals in the initial downlink BWP (Bandwidth Part) to obtain the signal quality (Synchronization Signal Reference Signal Received Power, SS-RSRP) of different SSBs. The terminal selects an SSB based on the threshold RSRP-Threshold SSB indicated in the system message (System Information Block #1, SIB1). If there are multiple SSBs with an SS-RSRP higher than the threshold, the terminal selects one of them as the associated SSB for the random access procedure. If the signal quality of all SSBs is lower than the threshold, the terminal can select any SSB as the associated SSB for the random access procedure. The specific SSB selection scheme can be implemented based on the terminal.

[0059] The terminal uses the selected SSB to determine the time-frequency resources or preamble resources for the PRACH signal. During random access, the transmission beam / QCL parameters of downlink signals Msg2 and Msg4 are guaranteed to be the same as those of the selected SSB.

[0060] (3) The terminal's received beam information;

[0061] Under the existing mechanism, PRACH signals are not retransmitted. After sending the PRACH signal, the terminal performs RAR (Msg2) and scheduling of the PDCCH for RAR, scheduling of the PDCCH for Msg3 retransmission, and reception of Msg4 (including the Physical Downlink Shared Channel (PDSCH) and the Physical Downlink Control Channel (PDCCH) for scheduling the PDSCH). Assuming that the antenna port of the Demodulation Reference Signal (DMRS) and the SSB or CSI-RS associated with the UE for sending PRACH are quasi-co-located, regardless of whether the terminal is indicated by the network to receive the Transmission Configuration Indicator state (TCI state) of the CORESET of DCI format 1-0, the quasi-co-located PDCCH (the above PDCCH formats are all DCI format 1-0) is determined in the above manner.

[0062] Additionally, for CORESET#0, the terminal assumes that the antenna port and downlink signal of the DMRS received by the PDCCH in this CORESET are quasi-co-located.

[0063] One or more downlink reference signals configured by TCI state, wherein the TCI state is indicated to CORESET by MAC CE activation command, or if no TCI state indicating CORESET is received by MAC CE after the most recent random access procedure, the SSB and DMRS determined by the terminal in the most recent random access procedure are quasi-co-located, and the random access procedure is not a non-contention-free random access procedure triggered by PDCCH order.

[0064] (4) Random access procedure for multiple SSB associations.

[0065] In cell edge areas or areas with limited coverage, the uplink signal coverage performance of the terminal is inferior to that of the downlink signal coverage. During random access, the coverage performance of Msg1 and Msg3 is inferior to that of Msg2 and Msg4. Furthermore, the difference in coverage performance between uplink and downlink channels is even more pronounced in the high-frequency band FR2.

[0066] To improve uplink signal coverage, we consider retransmitting the uplink signal. We can introduce a Msg3 retransmission mechanism to improve Msg3 coverage, or we can introduce Msg1 (PRACH) retransmission to improve coverage.

[0067] Figure 6 This is one of the schematic diagrams of the transmission beam of the PRACH signal provided in the embodiments of this application. Figure 7 This is the second schematic diagram of the transmission beam of the PRACH signal provided in the embodiments of this application, as shown below. Figure 6 and Figure 7 As shown, Figure 6 The transmission beam SSB in Figure 7 Corresponding to the transmission beam SSB in the context, in scenarios with limited coverage, since the SSB beam is usually a fixed beam, there may be areas of beam overlap between SSB beams. Figure 8 This is a schematic diagram of the signal quality corresponding to the transmission beam of the PRACH signal provided in the embodiments of this application, as shown below. Figure 8As shown, in this scenario, the signal quality (SS-RSRP) of multiple SSBs detected by the terminal may be similar. Selecting one SSB beam for random access means abandoning other possible SSB beams. However, if multiple SSBs can be selected to send Msg1, the probability of the network-side device successfully detecting Msg1 can be increased. Furthermore, since the SS-RSRP measurement during the random access phase is determined only based on a single measurement result of the SSB, the SS-RSRP measurement result may have measurement bias. Therefore, selecting multiple SSBs to send Msg1 can also reduce the impact of SSB measurement bias on SSB selection.

[0068] The following is an explanation of the relevant descriptions regarding quasi-colocation:

[0069] In the embodiments of this application, the description of quasi-co-addressable PDCCH, PDSCH and SSB / CSI-RS is the same as the description of quasi-co-addressable DMRS (antenna port) of PDCCH and PDSCH and SSB / CSI-RS, or in other words, the quasi-co-addressable attributes of both are the same.

[0070] TCI state refers to a network indication that downlink channels PDCCH, PDSCH (the DMRS antenna port), and a certain downlink RS (SSB / CSI-RS) are quasi-co-located.

[0071] Quasi-co-located properties include: Doppler shift, Doppler spread, average delay, delay spread, and spatial RX parameters.

[0072] The random access method and apparatus provided in this application will be described below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0073] Figure 9 This is one of the flowcharts illustrating the random access method provided in the embodiments of this application, such as... Figure 9 As shown, the method includes:

[0074] Step 900: The terminal device sends multiple Physical Random Access Channel (PRACH) signals, wherein the multiple PRACH resources used by the multiple PRACH signals correspond to multiple different downlink reference signals;

[0075] Wherein, the target PRACH resource among the multiple PRACH resources used by the multiple PRACH signals is associated with a quasi-co-located signal; the quasi-co-located signal is one or more of the multiple different downlink reference signals; the quasi-co-located signal is used by the terminal device to receive a first downlink signal, the first downlink signal being a Msg2 message or a Msg3 retransmission scheduling information or a Msg4 message.

[0076] Specifically, the multiple different downlink reference signals may be a subset of the SSB set or the CSI-RS set, determined by the terminal according to the rules predefined by the protocol or the rules indicated by the system message. The multiple different downlink reference signals are used to determine the transmission resources of multiple PRACH signals respectively.

[0077] Optionally, the terminal device may send multiple Physical Random Access Channel (PRACH) signals to the network-side device.

[0078] Optionally, the multiple PRACH resources used by multiple PRACH signals can correspond to multiple different downlink reference signals, which can be SSBs or pre-configured CSI-RS.

[0079] Optionally, the target PRACH resource among multiple PRACH resources can be associated with a quasi-co-address signal.

[0080] Optionally, after receiving multiple PRACHs, the network-side device can determine a quasi-co-address signal associated with the target PRACH resource among the multiple PRACH resources based on the target PRACH resource among the multiple PRACH resources.

[0081] Optionally, the quasi-co-address signal can be one or more of the plurality of different downlink reference signals.

[0082] For example, if there are multiple different downlink reference signals SSB0, SSB1, SSB2 and SSB3, then the quasi-co-address signal can be SSB0 or ​​SSB1 or SSB2 or SSB3, or it can be a combination of multiple SSBs, such as SSB0 and SSB1, or SSB1 and SSB3, or SSB0, SSB1 and SSB2, etc.

[0083] Optionally, the quasi-co-address signal can be used by the terminal equipment to receive the first downlink signal.

[0084] Optionally, if the terminal equipment and the network-side equipment have a consistent understanding of the co-located signal, the first downlink signal can be accurately detected and received, thereby improving detection efficiency.

[0085] Optionally, the first downlink signal can be a Msg2 message, a Msg3 retransmission scheduling message, or a Msg4 message.

[0086] Optionally, the random access method provided in this application embodiment is applicable not only to Msg2 and Msg4, but also to downlink control signaling DC that schedules Msg3 retransmission.

[0087] To overcome the defect that inconsistencies in the understanding of quasi-co-address signals between the terminal and network-side equipment when multiple PRACH signals are transmitted, leading to downlink signal transmission failure, this application embodiment associates the target PRACH resource among the multiple PRACH resources used by the terminal to the quasi-co-address signal. This allows the network-side equipment to determine the target PRACH resource after receiving multiple PRACH signals, and to determine the quasi-co-address signal based on the target PRACH resource and the association between the target PRACH resource and the quasi-co-address signal. This ensures that the terminal and network-side equipment have a consistent understanding of the quasi-co-address signal, thereby effectively guaranteeing the successful transmission of downlink signals.

[0088] In this embodiment, by associating the target PRACH resource among the multiple PRACH resources used by the transmitted multiple PRACH signals with a quasi-co-address signal, multiple PRACHs can be transmitted using the target PRACH resource to indicate the quasi-co-address signal associated with the target PRACH resource. This ensures that the terminal and network-side equipment have a consistent understanding of the quasi-co-address signal, thereby effectively guaranteeing the successful transmission of downlink signals.

[0089] Optionally, the PRACH resource includes at least one of the following:

[0090] Physical random access channel opportunity (RO) resources;

[0091] Preamble;

[0092] The mapping period between the downlink reference signal and the RO resource.

[0093] Optionally, a PRACH resource may include at least one of the following:

[0094] Physical random access channel opportunity RO resources; or

[0095] Preamble; or

[0096] The mapping period between the downlink reference signal and RO resources.

[0097] For example, a target RO resource among multiple RO resources can be associated with a quasi-co-located signal.

[0098] For example, a target preamble in multiple preamble resources can be associated with a quasi-co-located signal.

[0099] For example, the target mapping period in multiple mapping periods can be associated with a quasi-co-located signal.

[0100] Optionally, the first index of all said target PRACH resources associated with a quasi-co-address signal is the same.

[0101] Optionally, the first index of each target PRACH resource can be identical.

[0102] For example, if the target PRACH resource is at least one RO resource, the corresponding first index of at least one RO resource can be the same.

[0103] For example, if the target PRACH resource is at least one preamble resource, the corresponding first index of at least one preamble resource can be the same.

[0104] Optionally, multiple PRACH resources can be used as the target PRACH resource in their entirety or in part.

[0105] Optionally, when a portion of multiple PRACH resources is used as the target PRACH resource, after the network-side device receives multiple PRACHs, it can determine the multiple PRACH resources and then determine the first index of each of the multiple PRACH resources. When the network-side device determines, based on all the first indices, that a large number of the first indices are the same, it can determine that the PRACH resources corresponding to these identical first indices are the target PRACH resources, and then it can determine the quasi-co-address signal associated with the first index based on these identical first indices.

[0106] Optionally, if all of the multiple PRACH resources are used as target PRACH resources, after the network-side device receives multiple PRACHs, it can determine the multiple PRACH resources and then determine the first index of each of these PRACH resources. Since these first indices are all the same, the quasi-co-address signal associated with the first index can be determined based on these identical first indices.

[0107] Optionally, when there are multiple quasi-co-address signals, taking the quasi-co-address signals including SSB1 and SSB2, and the target PRACH resource being the target RO resource as an example, the subset containing the target RO resource may include multiple RO resources with the first index 'a' and multiple RO resources with the first index 'b'. The multiple RO resources with the first index 'a' can be associated with SSB1, and the multiple RO resources with the first index 'b' can be associated with SSB2. After the network-side device receives multiple PRACHs, it can determine the multiple PRACH resources, and then determine the first index of each of these PRACH resources. Since these first indices include 'a' and 'b', it can be determined that SSB1 associated with the first index 'a' is a quasi-co-address signal, and SSB2 associated with the first index 'b' is a quasi-co-address signal.

[0108] Optionally, the first index of the target PRACH resource includes at least one of the following:

[0109] When the PRACH resource is the RO resource, the first index of the target PRACH resource is: the index of the RO resource in the first RO set corresponding to each of the plurality of different downlink reference signals, wherein the first RO set includes all RO resources mapped by one downlink reference signal;

[0110] or,

[0111] When the PRACH resource is the preamble, the first index of the target PRACH resource is: the index of the preamble in the first preamble set corresponding to each of the multiple different downlink reference signals, wherein the first preamble set includes available preambles within any RO resource mapped by the downlink reference signal, and the available preambles are determined by system message configuration;

[0112] or,

[0113] When the PRACH resource is the mapping period, the first index of the target PRACH resource is: the index of the mapping period in the first mapping period pattern corresponding to each of the plurality of different downlink reference signals, wherein the first mapping period pattern corresponding to a downlink reference signal is the mapping period pattern between the downlink reference signal and any RO resource it maps to.

[0114] Optionally, when the PRACH resource is the RO resource, the first index of the target PRACH resource is: the index of the RO resource in the first RO set corresponding to each of the multiple different downlink reference signals, wherein the first RO set includes all RO resources mapped by the downlink reference signal. That is, when a downlink reference signal can be associated with multiple consecutive ROs through system message configuration, the first index represents the index value of the multiple consecutive ROs determined according to their frequency or time sequence.

[0115] For example, when the PRACH resource is a RO resource, Msg1 can be sent by determining a subset of RO resources associated with the quasi-co-address signal from the set of RO resources associated with the SSB based on the association order of the quasi-co-address signal in the downlink reference signal repeatedly transmitted in the PRACH.

[0116] For example, when the PRACH resource is a RO resource, the terminal device can determine the first index of the RO resource based on the order of the quasi-co-address signal in multiple different downlink reference signals repeatedly transmitted by Msg1, i.e., the second index corresponding to the quasi-co-address signal, and based on the association relationship between the first index and the second index of the RO resource.

[0117] Optionally, when the PRACH resource is the preamble, the first index of the target PRACH resource is: the index of the preamble in the first preamble set corresponding to each of the plurality of different downlink reference signals, wherein the first preamble set includes all available preambles within any RO resource mapped by the downlink reference signal, the available preambles are determined by system message configuration, and the available preambles are preambles that can be used for Msg1 repeated transmission.

[0118] For example, when the PRACH resource is a preamble, a subset of preambles associated with the quasi-co-address signals can be determined from the set of preambles used for repeated transmission of Msg1 to transmit Msg1, based on the association order of the quasi-co-address signals in the reference signals for repeated transmission.

[0119] For example, when the PRACH resource is a preamble, the terminal device can determine the first index of the preamble based on the order of the quasi-co-address signal in multiple different downlink reference signals repeatedly transmitted by Msg1, i.e., the second index corresponding to the quasi-co-address signal, and based on the association between the first index and the second index of the preamble.

[0120] Optionally, when the PRACH resource is the mapping period, the first index of the target PRACH resource is: the index of the mapping period within the first mapping period pattern corresponding to each of the multiple different downlink reference signals, wherein the first mapping period pattern (association pattern period) contains multiple consecutive mapping periods, and the start time and duration of the first mapping period pattern are defined by the protocol or configured by system messages.

[0121] For example, in the mapping cycle from SSB to RO resources, different time ranges or mapping cycles correspond to different quasi-co-address signals.

[0122] Optionally, when the PRACH resource is a RO resource, for any SSB among multiple SSBs transmitting multiple PRACHs, the RO resource with the first index in the RO set mapped by that SSB can be determined as the target resource. That is, for each SSB among multiple SSBs, an RO resource with the first index is determined as the target resource for sending Msg1. When the PRACH resource is a preamble or a mapping period, the case of the PRACH resource being a RO resource can be referred to, and will not be elaborated here.

[0123] Optionally, the second index of the quasi-co-address signal is associated with the first index;

[0124] The second index is the index of the quasi-co-address signal among the plurality of different downlink reference signals.

[0125] Optionally, the second index of the quasi-co-address signal can be associated with the first index of the target PRACH resource.

[0126] Optionally, the second index of the quasi-co-address signal can be the index of the quasi-co-address signal among multiple different downlink reference signals.

[0127] For example, if a terminal selects a set of SSBs to transmit Msg1 multiple times, and the selected set of SSBs (multiple different downlink reference signals) is SSB(i_0), SSB(i_1), ..., SSB(i_N-1), and the terminal selects SSB(j) as the quasi-co-address signal for Msg2 and Msg4, then the second index of the quasi-co-address signal can be j. For example, j represents the position of SSB(j) in the set SSB(i_0), SSB(i_1), ..., SSB(i_N-1) according to the SSB number in ascending order.

[0128] Optionally, the association between the second index and the first index includes a mathematical relationship.

[0129] Optionally, the association between the second index and the first index may include a mathematical relationship.

[0130] Optionally, the mathematical relationship can be predefined by the protocol or configured by system messages.

[0131] For example, in a set of SSBs {SSB(i_0), SSB(i_1), ... SSB(i_N-1)} selected by the terminal for multiple PRACH signal transmissions, each SSB is associated with M RO resources for Msg1 transmission, and M > 1 (the size of M can be determined by system message configuration; in this case, the M resources used by each SSB for Msg1 transmission are different). According to predefined rules or rules configured by system messages, there can be a mathematical mapping relationship between the order (second index) of the M RO resources and the quasi-co-address signal SSB(j). A subset of the M ROs can be used for the SSB set {SSB(i_0), SSB(i_1), ... SSB(i_N-1)} for multiple PRACH transmissions, and the Msg1 transmission of the quasi-co-address signal SSB(j) of the first downlink signal is repeated. That is, a subset is selected from the set of ROs associated with SSB(i) for Msg1 transmission according to the quasi-co-address signal of the first downlink signal to transmit Msg1. The determination of the target RO subset corresponding to the quasi-co-address signal SSB(j) can be m mod N=j, m=0,1,…,M-1 represents the index of M ROs, or [j*(M / N)+0,j*(M / N)+(M / N-1)] or other subset partitioning methods, where mod represents the remainder.

[0132] For example, in a RO resource associated with an SSB, the index set of the preamble is p_0 to p_K-1. According to predefined rules, the order (second index) of the K preambles and the quasi-co-address signal SSB(j) can have a mathematical mapping relationship. A subset of the K preambles can be used for multiple transmissions of the SSB set {SSB(i_1), SSB(i_2), ..., SSB(i_N)} of PRACH, and the Msg1 of the quasi-co-address signal SSB(j) of the first downlink signal can be repeatedly transmitted. The method for determining the target preamble subset corresponding to the quasi-co-address signal SSB(j) can be k mod N=j, m=0,1,...,K-1 representing the index of the K preambles, or [j*(M / N)+0, j*(M / N)+(M / N-1)] or other subset partitioning methods, where mod represents the remainder.

[0133] For example, the association period between an SSB and a RO resource can correspond to different quasi-co-located signals SSB(j). Starting from a reference time point (e.g., radio frame 0), x*N consecutive (x is a positive integer, defined by the protocol or configured by system messages) association periods of SSBs used for Msg1 transmission with RO resources are associated with N SSBs in the SSB set {SSB(i_1), SSB(i_2), ..., SSB(i_N)}. According to the protocol definition, the association between SSBs used for Msg1 transmission and RO resources is mapped starting from radio frame 0. Therefore, the first association period can correspond to a quasi-co-located signal SSB(j = i_0), the second association period can correspond to a quasi-co-located signal SSB(j = i_1), and so on.

[0134] In this embodiment, the target PRACH resource is associated with the quasi-co-located signal through a mathematical mapping relationship. This allows the quasi-co-located signal to be determined based on the association between the two, ensuring that the terminal and network-side equipment have a consistent understanding of the quasi-co-located signal, thereby effectively guaranteeing the successful transmission of downlink signals.

[0135] Optionally, before the terminal device sends multiple Physical Random Access Channel (PRACH) signals, the method further includes:

[0136] The terminal device determines the quasi-co-address signal from the plurality of different downlink reference signals;

[0137] The terminal device determines the first index associated with the second index based on the second index of the quasi-co-address signal;

[0138] The terminal device determines the target PRACH resource of the plurality of PRACH signals based on the first index.

[0139] Optionally, the terminal device can determine the quasi-co-address signal from multiple different downlink reference signals.

[0140] Optionally, the terminal device may determine the first index associated with the second index based on the second index of the quasi-co-address signal.

[0141] Optionally, the terminal device may determine the first index associated with the second index based on the second index of the quasi-co-address signal and based on the mathematical relationship between the second index and the first index.

[0142] Optionally, the terminal device may determine the target PRACH resource for multiple PRACH signals based on the first index.

[0143] For example, the terminal device can determine the target RO resource corresponding to the first index of multiple PRACH signals based on the second index and the mathematical relationship between the first index and the second index, and select one target RO resource from the target RO resources as the Msg1 transmission resource.

[0144] For example, the terminal device can determine the target preamble resource corresponding to the first index of multiple PRACH signals based on the second index and the mathematical relationship between the first index and the second index, and select one target preamble resource from the target preamble resources as the Msg1 transmission resource.

[0145] For example, a terminal device can determine the target mapping period of multiple PRACH signals based on a second index and the mathematical relationship between the first and second indices.

[0146] Optionally, the terminal device determines the quasi-co-address signal from the plurality of different downlink reference signals, including:

[0147] The terminal device determines the downlink reference signal with the largest reference signal reception quality value from the plurality of different downlink reference signals as the quasi-co-address signal based on the reference signal reception quality.

[0148] Optionally, the terminal device may determine the downlink reference signal with the largest reference signal reception quality value from multiple different downlink reference signals as the quasi-co-address signal based on the reference signal reception quality.

[0149] Optionally, the reference signal reception quality may include reference signal received power (RSRP), reference signal received quality (RSRQ), or signal to interference plus noise ratio (SINR).

[0150] For example, the terminal device may select one SSB from the SSB set as the quasi-co-address signal for Msg2 and Msg4. The selection method may include at least one of the following:

[0151] (1) Random selection is implemented based on the terminal;

[0152] (2) Choose the SSB with the best RSRP, RSRQ, or SINR;

[0153] (3) Select according to the threshold value configured on the network side device. If there is an SSB with SS-RSRP higher than the threshold value, select one SSB from the multiple SSBs that meet the conditions; if there is no SSB with SS-RSRP higher than the threshold value, you can select an SSB according to method (1) or (2).

[0154] Optionally, if no SSB meets the conditions, the terminal device can select a preamble from a dedicated preamble set to send Msg1. This dedicated preamble set is not used for quasi-co-location signal association and is configured by system messages. The terminal device can listen to the RARs corresponding to the RO resources associated with all SSBs according to preset rules, that is, the terminal device listens to the RARs corresponding to multiple beams. Correspondingly, if the network-side device detects a preamble in the dedicated preamble set, it will repeatedly transmit downlink signals to the associated multiple SSBs using Msg1 according to preset rules.

[0155] Optionally, the terminal device determines the quasi-co-address signal from the plurality of different downlink reference signals, including:

[0156] When a first downlink reference signal exists among the multiple different downlink reference signals, the terminal device randomly selects one downlink reference signal from the first downlink reference signal as the quasi-co-address signal, or the terminal device selects the first downlink reference signal with the largest value of the reference signal reception quality from the first downlink reference signal as the quasi-co-address signal;

[0157] If the first downlink reference signal is not present among the plurality of different downlink reference signals, the terminal device randomly selects one downlink reference signal from the plurality of different downlink reference signals as the quasi-co-address signal, or the terminal device selects the downlink reference signal with the largest value of the received quality of the reference signal from the plurality of different downlink reference signals as the quasi-co-address signal;

[0158] Wherein, the first downlink reference signal is a downlink reference signal whose received quality value is greater than a first threshold.

[0159] Optionally, if a first downlink reference signal exists among multiple different downlink reference signals, the terminal device may randomly select one downlink reference signal from the first downlink reference signal as a quasi-co-address signal.

[0160] Optionally, if a first downlink reference signal exists among multiple different downlink reference signals, the terminal device can determine the first downlink reference signal with the largest reference signal reception quality value from the first downlink reference signals as the quasi-co-address signal.

[0161] Optionally, if a first downlink reference signal is not present among multiple different downlink reference signals, the terminal device may randomly select one downlink reference signal from among the multiple different downlink reference signals as a quasi-co-address signal.

[0162] Optionally, if a first downlink reference signal is not present among multiple different downlink reference signals, the terminal device may determine the downlink reference signal with the highest reference signal reception quality value from among the multiple different downlink reference signals as the quasi-co-address signal.

[0163] Optionally, the first downlink reference signal may be a downlink reference signal whose received quality value is greater than a first threshold.

[0164] Optionally, the first threshold can be a threshold value configured by the network-side device or a preset threshold value. This application embodiment does not specifically limit this.

[0165] Optionally, the size of the first threshold can be arbitrarily configured or set according to requirements, and this application embodiment does not specifically limit it.

[0166] Optionally, the terminal device transmits multiple Physical Random Access Channel (PRACH) signals, including:

[0167] The terminal device randomly determines multiple PRACH resources and sends the multiple PRACH signals.

[0168] The method further includes:

[0169] The terminal device determines the quasi-co-address signal based on a target PRACH resource among the randomly determined plurality of PRACH resources.

[0170] Optionally, the terminal device may randomly determine multiple PRACH resources and send multiple PRACH signals.

[0171] For example, the terminal device can randomly determine multiple RO resources and send multiple PRACH signals.

[0172] For example, a terminal device can randomly determine multiple preamble resources and send multiple PRACH signals.

[0173] Optionally, the terminal device may determine the quasi-co-location signal based on a target PRACH resource among a plurality of randomly determined PRACH resources.

[0174] Optionally, the terminal device may determine the transmission resources of Msg1 (e.g., RO index, preamble, or transmission time of Msg1) based on the reference signal association order of the selected quasi-co-address signals repeatedly transmitted in Msg1.

[0175] For example, when an SSB is associated with multiple RO resources, the terminal device can determine a subset of RO resources associated with the SSB and send Msg1 based on the association order of the reference signals repeatedly transmitted by the quasi-co-address signal in Msg1.

[0176] For example, the terminal device determines a subset of preambles from the preamble set contained in each RO resource and sends it to Msg1 based on the reference signal association order in which the quasi-co-address signal is repeatedly transmitted in Msg1.

[0177] For example, in the mapping cycle from SSB to RO resources, different time ranges (mapping cycles) can correspond to different quasi-co-address signals.

[0178] Optionally, the terminal device may select a quasi-co-address signal based on rules predefined in the protocol or rules configured in system messages. The rules may be the association between the first index and the second index mentioned above.

[0179] Optionally, the terminal device determines the receiving beam of the first downlink signal based on the quasi-co-address signal. The random access method provided in this application will be described below through a specific embodiment.

[0180] Assume the terminal device randomly selects a target resource from the resources (RO and preamble) of Msg1 and transmits Msg1. The network-side devices and the terminal can determine the quasi-co-address signals (SSB / CSI-RS) of Msg2 and Msg4 based on the resources of Msg1. The terminal then determines the receive beams for Msg2 and Msg4 based on the quasi-co-address signals.

[0181] For example, when a terminal device repeatedly transmits Msg1, it uses the preamble I resource. According to the rules defined by the protocol or configured by the system message, preamble I corresponds to the SSB(J) associated with the Jth transmission of Msg1 when Msg1 is repeatedly transmitted. Then, the network-side device and the terminal device use SSB(J) as the quasi-co-address signal for Msg2 and Msg4.

[0182] For example, the terminal device selects SSB0 and SSB1 as the associated SSBs for repeated transmission of Msg1. The terminal device transmits Msg1 on the RO resources associated with SSB0 and SSB1 respectively, and the preamble index is the same. If the preamble index is even, the network-side device and the terminal device can use SSB0 as a quasi-co-address signal for the transmission of Msg2 and Msg4; if it is odd, SSB1 can be used as a quasi-co-address signal.

[0183] In this embodiment, by associating the target PRACH resource among the multiple PRACH resources used by the transmitted multiple PRACH signals with a quasi-co-address signal, multiple PRACHs can be transmitted using the target PRACH resource to indicate the quasi-co-address signal associated with the target PRACH resource. This ensures that the terminal and network-side equipment have a consistent understanding of the quasi-co-address signal, thereby effectively guaranteeing the successful transmission of downlink signals.

[0184] Figure 10 This is a second schematic flowchart of the random access method provided in the embodiments of this application, as shown below. Figure 10 As shown, the method includes:

[0185] Step 1000: The network-side device receives multiple PRACH signals, wherein the multiple PRACH resources used by the multiple PRACH signals are respectively associated with multiple different downlink reference signals; wherein, the target PRACH resource among the multiple PRACH resources is associated with a quasi-co-address signal; the quasi-co-address signal is one or more of the multiple different downlink reference signals;

[0186] Step 1010: The network-side device determines the quasi-co-address signal of the first downlink signal based on the target PRACH resource;

[0187] The first downlink signal is either Msg2 message, Msg3 retransmission scheduling information, or Msg4 message.

[0188] Optionally, the network-side device can receive multiple PRACH signals sent by the terminal device.

[0189] Specifically, the multiple different downlink reference signals may be a subset of the SSB set or the CSI-RS set, determined by the terminal according to the rules predefined by the protocol or the rules indicated by the system message. The multiple different downlink reference signals are used to determine the transmission resources of multiple PRACH signals respectively.

[0190] Optionally, the target PRACH resource among multiple PRACH resources can be associated with a quasi-co-address signal.

[0191] For example, a target resource among multiple RO resources can be associated with a quasi-co-located signal.

[0192] For example, a target preamble in multiple preamble resources can be associated with a quasi-co-located signal.

[0193] For example, the target mapping period in multiple mapping periods can be associated with a quasi-co-located signal.

[0194] Optionally, after receiving multiple PRACHs, the network-side device can determine a quasi-co-address signal associated with the target PRACH resource among the multiple PRACH resources based on the target PRACH resource among the multiple PRACH resources.

[0195] Optionally, the quasi-co-address signal can be one or more of a plurality of different downlink reference signals.

[0196] For example, if there are multiple different downlink reference signals SSB0, SSB1, SSB2 and SSB3, then the quasi-co-address signal can be SSB0 or ​​SSB1 or SSB2 or SSB3, or it can be SSB0 and SSB1, or SSB1 and SSB3, or SSB0, SSB1 and SSB2, etc.

[0197] Optionally, the network-side device may determine the quasi-co-address signal of the first downlink signal based on the target PRACH resource.

[0198] Optionally, the first downlink signal can be a Msg2 message, a Msg3 retransmission scheduling message, or a Msg4 message.

[0199] Optionally, when the terminal sends Msg1, it selects the target resource according to the predefined rules of the protocol. After detecting Msg1, the network-side device can determine the quasi-co-address signal (SSB / CSI-RS) of Msg2 and Msg4 based on the RO resource or preamble resource used by Msg1.

[0200] For example, when the terminal sends Msg1, it selects a preamble resource according to the predefined rules of the protocol, and the network-side device determines the quasi-co-address signals of Msg2 and Msg4 based on the preamble index.

[0201] Optionally, the random access method provided in this application embodiment is applicable not only to Msg2 and Msg4, but also to the quasi-co-address signal of the PDCCH retransmitted by Msg3.

[0202] The random access method provided in this application example is described below through a specific embodiment.

[0203] During the initial access phase, the terminal device selects to send Msg1 multiple times using a set of SSBs. The set of SSBs selected by the terminal is SSB(i_0), SSB(i_1), ... SSB(i_N-1), and their corresponding signal quality is SS-RSRP(i_0), SS-RSRP(i_1), ... SS-RSRP(i_N-1).

[0204] Optionally, the terminal device may select one SSB from the SSB set as the quasi-co-address signal for Msg2 and Msg4. The selection method may include at least one of the following:

[0205] (1) Random selection is implemented based on the terminal;

[0206] (2) Choose the SSB with the best RSRP, RSRQ, or SINR;

[0207] (3) Select according to the threshold value configured on the network side device. If there is an SSB with SS-RSRP higher than the threshold value, select one SSB from the multiple SSBs that meet the conditions; if there is no SSB with SS-RSRP higher than the threshold value, you can select an SSB according to method (1) or (2).

[0208] Optionally, if no SSB meets the conditions, the terminal device can select a preamble from a dedicated preamble set to send Msg1. This dedicated preamble set is not used for quasi-co-location signal association and is configured by system messages. The terminal device can listen to the RARs corresponding to the RO resources associated with all SSBs according to preset rules, that is, the terminal device listens to the RARs corresponding to multiple beams. Correspondingly, if the network-side device detects a preamble in the dedicated preamble set, it will repeatedly transmit downlink signals to the associated multiple SSBs using Msg1 according to preset rules.

[0209] For example, the terminal selects SSB(j) as the quasi-co-address signal for Msg2 and Msg4. SSB(j) belongs to the SSB set {SSB(i_0), SSB(i_1), ..., SSB(i_N-1)}. The order of SSB(j) in the SSB set can be j, depending on the SSB index or the SSB association order when Msg1 is repeatedly transmitted.

[0210] Optionally, the terminal device can determine the RO resource, preamble, or time period sent by Msg1 based on the order of the quasi-co-address signal SSB(j).

[0211] For example, in a set of SSBs {SSB(i_0), SSB(i_1), ... SSB(i_N-1)} selected by the terminal for multiple PRACH signal transmissions, each SSB is associated with M RO resources for Msg1 transmission, and M > 1 (the size of M can be determined by system message configuration; in this case, the M resources used by each SSB for Msg1 transmission are different). According to predefined rules or rules configured by system messages, there can be a mathematical mapping relationship between the order (second index) of the M RO resources and the quasi-co-address signal SSB(j). A subset of the M ROs can be used for the SSB set {SSB(i_0), SSB(i_1), ... SSB(i_N-1)} for multiple PRACH transmissions, and the Msg1 transmission of the quasi-co-address signal SSB(j) of the first downlink signal is repeated. That is, a subset is selected from the set of ROs associated with SSB(i) for Msg1 transmission according to the quasi-co-address signal of the first downlink signal to transmit Msg1. The subsets of RO can be determined by m mod N = j, where m = 0, 1, ..., M-1 represents the indices of M ROs, or by [j*(M / N)+0, j*(M / N)+(M / N-1)] or other subset partitioning methods, where mod represents the remainder.

[0212] For example, in the associated RO resources of an SSB, the set of preamble numbers is p_0 to p_K-1. According to predefined rules, there is a mapping relationship between the K preambles and the order of the quasi-co-address signal SSB(j). A subset of the K preambles can be used for the SSB set {SSB(i_1), SSB(i_2), ..., SSB(i_N)} that transmits PRACH multiple times, and the Msg1 of the quasi-co-address signal SSB(j) of the first downlink signal is repeatedly transmitted. The preamble subset can be determined by k mod N=j, m=0,1,...,K-1 representing the numbers of the K preambles, or [j*(M / N)+0, j*(M / N)+(M / N-1)] or other subset partitioning methods, where mod represents the remainder.

[0213] For example, the association period between an SSB and a RO resource corresponds to different quasi-co-addressable signals SSB(j). Starting from a reference time point (e.g., radio frame 0), x*N consecutive (x is a positive integer, defined by the protocol or configured by system messages) association periods between an SSB and a RO for Msg1 transmission are associated with N SSBs in the SSB set {SSB(i_1), SSB(i_2), ..., SSB(i_N)}. According to the protocol definition, the association between an SSB and a RO resource for Msg1 transmission is mapped starting from radio frame 0. Therefore, the first association period corresponds to the quasi-co-addressable signal SSB(j = i_0), the second association period corresponds to the quasi-co-addressable signal SSB(j = i_1), and so on.

[0214] Optionally, the terminal device can select RO resources and preamble resources from the above set to send Msg1.

[0215] Optionally, after detecting a repeatedly transmitted Msg1, the network-side device can determine the quasi-co-address reference signals for Msg2 and Msg4 based on RO resources and preamble resources. In this embodiment, the network-side device determines the quasi-co-address signal by considering the association between the target PRACH resource among the multiple PRACH resources used by the received PRACH signals and the quasi-co-address signal. This ensures that the network-side device and the terminal have a consistent understanding of the quasi-co-address signal, thereby effectively guaranteeing the successful transmission of downlink signals.

[0216] Optionally, the PRACH resource includes at least one of the following:

[0217] Physical random access channel opportunity (RO) resources;

[0218] Preamble;

[0219] The mapping period between the downlink reference signal and the RO resource.

[0220] Optionally, a PRACH resource may include at least one of the following:

[0221] Physical random access channel opportunity RO resources; or

[0222] Preamble; or

[0223] The mapping period between the downlink reference signal and the RO resource.

[0224] For example, a target RO resource among multiple RO resources can be associated with a quasi-co-located signal.

[0225] For example, a target preamble in multiple preamble resources can be associated with a quasi-co-located signal.

[0226] For example, the target mapping period in multiple mapping periods can be associated with a quasi-co-located signal.

[0227] Optionally, the first index of all said target PRACH resources associated with a quasi-co-address signal is the same.

[0228] Optionally, the first index of each target PRACH resource can be the same.

[0229] For example, if the target PRACH resource is at least one RO resource, the first index corresponding to at least one RO resource can be the same.

[0230] For example, if the target PRACH resource is at least one preamble resource, the first index corresponding to at least one preamble resource can be the same.

[0231] Optionally, multiple PRACH resources can be used as the target PRACH resource in their entirety or in part.

[0232] Optionally, when a portion of multiple PRACH resources is used as the target PRACH resource, after the network-side device receives multiple PRACHs, it can determine the multiple PRACH resources and then determine the first index of each of the multiple PRACH resources. When the network-side device determines, based on all the first indices, that a large number of the first indices are the same, it can determine that the PRACH resources corresponding to these identical first indices are the target PRACH resources, and then it can determine the quasi-co-address signal associated with the first index based on these identical first indices.

[0233] Optionally, if all of the multiple PRACH resources are used as target PRACH resources, after the network-side device receives multiple PRACHs, it can determine the multiple PRACH resources and then determine the first index of each of these PRACH resources. Since these first indices are all the same, the quasi-co-address signal associated with the first index can be determined based on these identical first indices.

[0234] Optionally, when there are multiple quasi-co-address signals, taking the quasi-co-address signals including SSB1 and SSB2, and the target PRACH resource being the target RO resource as an example, the subset containing the target RO resource may include multiple RO resources with the first index 'a' and multiple RO resources with the first index 'b'. The multiple RO resources with the first index 'a' can be associated with SSB1, and the multiple RO resources with the first index 'b' can be associated with SSB2. After the network-side device receives multiple PRACHs, it can determine the multiple PRACH resources, and then determine the first index of each of these PRACH resources. Since these first indices include 'a' and 'b', it can be determined that SSB1 associated with the first index 'a' is a quasi-co-address signal, and SSB2 associated with the first index 'b' is a quasi-co-address signal.

[0235] Optionally, the first index of the target PRACH resource includes at least one of the following:

[0236] When the PRACH resource is the RO resource, the first index of the target PRACH resource is: the index of the RO resource in the first RO set corresponding to each of the plurality of different downlink reference signals, wherein the first RO set includes all RO resources mapped by one downlink reference signal;

[0237] or,

[0238] When the PRACH resource is the preamble, the first index of the target PRACH resource is: the index of the preamble in the first preamble set corresponding to each of the multiple different downlink reference signals, wherein the first preamble set includes available preambles within any RO resource mapped by the downlink reference signal, and the available preambles are determined by system message configuration;

[0239] or,

[0240] When the PRACH resource is the mapping period, the first index of the target PRACH resource is: the index of the mapping period within the first mapping pattern period corresponding to each of the multiple different downlink reference signals, wherein the first mapping pattern period contains multiple consecutive mapping periods, and the start time and duration of the first mapping pattern period are defined by the protocol or configured by system messages.

[0241] For example, when the PRACH resource is a RO resource, the terminal device can determine a subset of ROs associated with the quasi-co-address signal from the set of RO resources associated with the SSB based on the association order of the quasi-co-address signal in the downlink reference signal repeatedly transmitted in the PRACH, and then transmit Msg1.

[0242] For example, when the PRACH resource is a RO resource, the terminal device can determine the first index of the RO resource based on the order of the quasi-co-address signal in multiple different downlink reference signals repeatedly transmitted by Msg1, i.e., the second index corresponding to the quasi-co-address signal, and based on the association relationship between the first index and the second index of the RO resource.

[0243] Optionally, when the PRACH resource is a preamble, the first index of the target PRACH resource can be: the index of the preamble in the first preamble set corresponding to each of the plurality of different downlink reference signals, wherein the first preamble set corresponding to a downlink reference signal includes all preambles within any RO resource mapped by the downlink reference signal.

[0244] For example, when the PRACH resource is a preamble, the terminal device can determine a subset of preambles associated with the quasi-co-address signal from the set of preambles used for repeated transmission of Msg1 based on the association order of the quasi-co-address signal in the reference signal for repeated transmission, and then transmit Msg1.

[0245] For example, when the PRACH resource is a preamble, the terminal device can determine the first index of the preamble based on the order of the quasi-co-address signal in multiple different downlink reference signals repeatedly transmitted by Msg1, i.e., the second index corresponding to the quasi-co-address signal, and based on the association between the first index and the second index of the preamble.

[0246] Optionally, when the PRACH resource is a mapping period, the first index of the target PRACH resource can be: the index of the mapping period within the first mapping period pattern corresponding to each of the plurality of different downlink reference signals, wherein the first mapping period pattern corresponding to a downlink reference signal is the mapping period pattern between the downlink reference signal and any RO resource it maps to.

[0247] For example, in the mapping cycle from SSB to RO resources, different time ranges or mapping cycles correspond to different quasi-co-address signals.

[0248] Optionally, when the PRACH resource is a RO resource, for any SSB among multiple SSBs transmitting multiple PRACHs, the terminal device can determine the RO resource with the first index in the RO set mapped to that SSB as the target resource. That is, for each SSB among multiple SSBs, a RO resource with the first index is determined as the target resource for sending Msg1. When the PRACH resource is a preamble or a mapping period, the case of the PRACH resource being a RO resource can be referred to, and will not be elaborated here.

[0249] Optionally, the second index of the quasi-co-address signal is associated with the first index;

[0250] The second index is the index of the quasi-co-address signal among the plurality of different downlink reference signals.

[0251] Optionally, the second index of the quasi-co-address signal can be associated with the first index of the target PRACH resource.

[0252] Optionally, the second index can be the index of the quasi-co-address signal among multiple different downlink reference signals.

[0253] For example, if a terminal selects a set of SSBs to transmit Msg1 multiple times, and the selected set of SSBs (multiple different downlink reference signals) is SSB(i_0), SSB(i_1), ..., SSB(i_N-1), and the terminal selects SSB(j) as the quasi-co-address signal for Msg2 and Msg4, then the second index of the quasi-co-address signal is j. For example, j represents the position of SSB(j) in the set SSB(i_0), SSB(i_1), ..., SSB(i_N-1) according to the SSB number in ascending order.

[0254] Optionally, the association between the second index and the first index includes a mathematical relationship.

[0255] Optionally, the association between the second index and the first index may include a mathematical relationship.

[0256] Optionally, the mathematical relationship can be predefined by the protocol or configured by system messages.

[0257] For example, in a set of SSBs {SSB(i_0), SSB(i_1), ... SSB(i_N-1)} selected by the terminal for multiple PRACH signal transmissions, each SSB is associated with M RO resources for Msg1 transmission, and M > 1 (the size of M can be determined by system message configuration; in this case, the M resources used by each SSB for Msg1 transmission are different). According to predefined rules or rules configured by system messages, there can be a mathematical mapping relationship between the order (second index) of the M RO resources and the quasi-co-address signal SSB(j). A subset of the M ROs can be used for the SSB set {SSB(i_0), SSB(i_1), ... SSB(i_N-1)} for multiple PRACH transmissions, and the Msg1 transmission of the quasi-co-address signal SSB(j) of the first downlink signal is repeated. That is, a subset is selected from the set of ROs associated with SSB(i) for Msg1 transmission according to the quasi-co-address signal of the first downlink signal to transmit Msg1. The subsets of RO can be determined by m mod N = j, where m = 0, 1, ..., M-1 represents the indices of M ROs, or by [j*(M / N)+0, j*(M / N)+(M / N-1)] or other subset partitioning methods, where mod represents the remainder.

[0258] For example, in a RO resource associated with an SSB, the index set of the preamble is p_0 to p_K-1. According to predefined rules, there can be a mathematical mapping relationship between the K preambles and the order (second index) of the quasi-co-address signal SSB(j). A subset of the K preambles can be used for multiple transmissions of the SSB set {SSB(i_1), SSB(i_2), ..., SSB(i_N)} of PRACH, and the Msg1 of the quasi-co-address signal SSB(j) of the first downlink signal can be repeatedly transmitted. The preamble subset can be determined by k mod N = j, m = 0, 1, ..., K-1 representing the index of the K preambles, or [j*(M / N)+0, j*(M / N)+(M / N-1)] or other subset partitioning methods, where mod represents the remainder.

[0259] For example, the association period between an SSB and a RO resource can correspond to different quasi-co-located signals SSB(j). Starting from a reference time point (e.g., radio frame 0), x*N consecutive (x is a positive integer, defined by the protocol or configured by system messages) association periods of SSBs used for Msg1 transmission with RO resources are associated with N SSBs in the SSB set {SSB(i_1), SSB(i_2), ..., SSB(i_N)}. According to the protocol definition, the association between SSBs used for Msg1 transmission and RO resources is mapped starting from radio frame 0. Therefore, the first association period can correspond to a quasi-co-located signal SSB(j = i_0), the second association period can correspond to a quasi-co-located signal SSB(j = i_1), and so on.

[0260] In this embodiment, the network-side device determines the quasi-co-located signal based on the association between the target PRACH resource and the quasi-co-located signal among the multiple PRACH resources used by the received multiple PRACH signals, so as to ensure that the network-side device and the terminal have a consistent understanding of the quasi-co-located signal, thereby effectively ensuring the successful transmission of downlink signals.

[0261] It should be noted that the random access method provided in this application embodiment can be executed by a random access device, or by a control module within the random access device for executing the random access method. This application embodiment uses the execution of the random access method by a random access device as an example to illustrate the random access device provided in this application embodiment.

[0262] Figure 11 This is one of the structural schematic diagrams of the random access device provided in the embodiments of this application, such as... Figure 11 As shown, it includes: a first transmitting module 1110; wherein:

[0263] The first transmitting module 1110 is used to transmit multiple Physical Random Access Channel (PRACH) signals, wherein the multiple PRACH resources used by the multiple PRACH signals correspond to multiple different downlink reference signals.

[0264] Wherein, the target PRACH resource among the multiple PRACH resources used by the multiple PRACH signals is associated with a quasi-co-located signal; the quasi-co-located signal is one or more of the multiple different downlink reference signals; the quasi-co-located signal is used by the terminal device to receive a first downlink signal, the first downlink signal being a Msg2 message or a Msg3 retransmission scheduling information or a Msg4 message.

[0265] In this embodiment, by associating the target PRACH resource among the multiple PRACH resources used by the transmitted multiple PRACH signals with a quasi-co-address signal, multiple PRACHs can be transmitted using the target PRACH resource to indicate the quasi-co-address signal associated with the target PRACH resource. This ensures that the terminal and network-side equipment have a consistent understanding of the quasi-co-address signal, thereby effectively guaranteeing the successful transmission of downlink signals.

[0266] Optionally, the PRACH resource includes at least one of the following:

[0267] Physical random access channel opportunity (RO) resources;

[0268] Preamble;

[0269] The mapping period between the downlink reference signal and the RO resource.

[0270] Optionally, the first index of all said target PRACH resources associated with a quasi-co-address signal is the same.

[0271] Optionally, the first index of the target PRACH resource includes at least one of the following:

[0272] When the PRACH resource is the RO resource, the first index of the target PRACH resource is: the index of the RO resource in the first RO set corresponding to each of the plurality of different downlink reference signals, wherein the first RO set includes all RO resources mapped by one downlink reference signal;

[0273] or,

[0274] When the PRACH resource is the preamble, the first index of the target PRACH resource is: the index of the preamble in the first preamble set corresponding to each of the multiple different downlink reference signals, wherein the first preamble set includes available preambles within any RO resource mapped by the downlink reference signal, and the available preambles are determined by system message configuration;

[0275] or,

[0276] When the PRACH resource is the mapping period, the first index of the target PRACH resource is: the index of the mapping period within the first mapping pattern period corresponding to each of the multiple different downlink reference signals, wherein the first mapping pattern period contains multiple consecutive mapping periods, and the start time and duration of the first mapping pattern period are defined by the protocol or configured by system messages.

[0277] Optionally, the second index of the quasi-co-address signal is associated with the first index;

[0278] The second index is the index of the quasi-co-address signal among the plurality of different downlink reference signals.

[0279] Optionally, the association between the second index and the first index includes a mathematical relationship.

[0280] Optionally, the device further includes: a first determining module, a second determining module, and a third determining module, wherein:

[0281] A first determining module is configured to determine the quasi-co-address signal from the plurality of different downlink reference signals before the terminal device sends a plurality of physical random access channel (PRACH) signals.

[0282] The second determining module is configured to, before the terminal device sends multiple Physical Random Access Channel (PRACH) signals, determine the first index associated with the second index based on the second index of the quasi-co-address signal;

[0283] The third determining module is used to determine the target PRACH resource of the multiple PRACH signals based on the first index before the terminal device sends multiple physical random access channel (PRACH) signals.

[0284] Optionally, the first determining module is further configured to:

[0285] Based on the received power quality of the reference signal, the downlink reference signal with the largest received power quality value among the plurality of different downlink reference signals is determined as the quasi-co-address signal.

[0286] Optionally, the first determining module is further configured to:

[0287] In the case where a first downlink reference signal exists among the multiple different downlink reference signals, the terminal device randomly determines one downlink reference signal from the first downlink reference signal as the quasi-co-address signal, or the terminal device determines the first downlink reference signal with the largest value of the received power quality of the reference signal from the first downlink reference signal as the quasi-co-address signal;

[0288] If the first downlink reference signal is not present among the plurality of different downlink reference signals, the terminal device randomly determines one downlink reference signal from the plurality of different downlink reference signals as the quasi-co-address signal, or the terminal device determines the downlink reference signal with the largest received power quality value from the plurality of different downlink reference signals as the quasi-co-address signal;

[0289] Wherein, the first downlink reference signal is a downlink reference signal whose received power quality value is greater than a first threshold.

[0290] Optionally, the first sending module is further configured to:

[0291] Randomly determine multiple PRACH resources and send the multiple PRACH signals;

[0292] The quasi-co-location signal is determined based on the target PRACH resource among the randomly determined plurality of PRACH resources.

[0293] In this embodiment, by associating the target PRACH resource among the multiple PRACH resources used by the transmitted multiple PRACH signals with a quasi-co-address signal, multiple PRACHs can be transmitted using the target PRACH resource to indicate the quasi-co-address signal associated with the target PRACH resource. This ensures that the terminal and network-side equipment have a consistent understanding of the quasi-co-address signal, thereby effectively guaranteeing the successful transmission of downlink signals.

[0294] Figure 12 This is a second schematic flowchart of the random access device provided in the embodiments of this application, as shown below. Figure 12 As shown, it includes: a first receiving module 1210 and a fourth determining module 1220; wherein:

[0295] The first receiving module 1210 is used to receive multiple PRACH signals, wherein the multiple PRACH resources used by the multiple PRACH signals are respectively associated with multiple different downlink reference signals; wherein, the target PRACH resource among the multiple PRACH resources is associated with a quasi-co-address signal; the quasi-co-address signal is one or more of the multiple different downlink reference signals;

[0296] The fourth determining module 1220 is used to determine the quasi-co-address signal of the first downlink signal based on the target PRACH resource;

[0297] The first downlink signal is either Msg2 message, Msg3 retransmission scheduling information, or Msg4 message.

[0298] Optionally, the random access device may receive multiple PRACH signals through the first receiving module 1210; and then, based on the target PRACH resource, determine the quasi-co-address signal of the first downlink signal through the fourth determining module 1220.

[0299] In this embodiment, the network-side device determines the quasi-co-located signal based on the association between the target PRACH resource and the quasi-co-located signal among the multiple PRACH resources used by the received multiple PRACH signals, so as to ensure that the network-side device and the terminal have a consistent understanding of the quasi-co-located signal, thereby effectively ensuring the successful transmission of downlink signals.

[0300] Optionally, the PRACH resource includes at least one of the following:

[0301] Physical random access channel opportunity (RO) resources;

[0302] Preamble;

[0303] The mapping period between the downlink reference signal and the RO resource.

[0304] Optionally, the first index of all said target PRACH resources associated with a quasi-co-address signal is the same.

[0305] Optionally, the first index of the target PRACH resource includes at least one of the following:

[0306] When the PRACH resource is the RO resource, the first index of the target PRACH resource is: the index of the RO resource in the first RO set corresponding to each of the plurality of different downlink reference signals, wherein the first RO set includes all RO resources mapped by one downlink reference signal;

[0307] or,

[0308] When the PRACH resource is the preamble, the first index of the target PRACH resource is: the index of the preamble in the first preamble set corresponding to each of the multiple different downlink reference signals, wherein the first preamble set includes available preambles within any RO resource mapped by the downlink reference signal, and the available preambles are determined by system message configuration;

[0309] or,

[0310] When the PRACH resource is the mapping period, the first index of the target PRACH resource is: the index of the mapping period within the first mapping pattern period corresponding to each of the multiple different downlink reference signals, wherein the first mapping pattern period contains multiple consecutive mapping periods, and the start time and duration of the first mapping pattern period are defined by the protocol or configured by system messages.

[0311] Optionally, the second index of the quasi-co-address signal is associated with the first index;

[0312] The second index is the index of the quasi-co-address signal among the plurality of different downlink reference signals.

[0313] Optionally, the association between the second index and the first index includes a mathematical relationship.

[0314] In this embodiment, the network-side device determines the quasi-co-located signal based on the association between the target PRACH resource and the quasi-co-located signal among the multiple PRACH resources used by the received multiple PRACH signals, so as to ensure that the network-side device and the terminal have a consistent understanding of the quasi-co-located signal, thereby effectively ensuring the successful transmission of downlink signals.

[0315] The random access device in this application embodiment can be a device, a device with an operating system, or an electronic device, or it can be a component, integrated circuit, or chip in a terminal. The device or electronic device can be a mobile terminal or a non-mobile terminal. For example, a mobile terminal can include, but is not limited to, the types of terminals 11 listed above, while a non-mobile terminal can be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application embodiment does not specifically limit the type of terminal.

[0316] The random access device provided in this application embodiment can achieve... Figure 9 and Figure 10 The various processes implemented in the method embodiments achieve the same technical effect, and will not be described again here to avoid repetition.

[0317] Optional, Figure 13 This is a schematic diagram of the structure of the communication device provided in an embodiment of this application. For example... Figure 13 As shown, this application embodiment also provides a communication device 1300, including a processor 1301, a memory 1302, and a program or instructions stored in the memory 1302 and executable on the processor 1301. For example, when the communication device 1300 is a terminal, the program or instructions executed by the processor 1301 implement the various processes of the above-described random access method embodiment and achieve the same technical effect. When the terminal device 1300 is a network-side device, the program or instructions executed by the processor 1301 implement the various processes of the above-described random access method embodiment and achieve the same technical effect. To avoid repetition, further details are omitted here.

[0318] This application embodiment also provides a terminal, including a processor and a communication interface. The communication interface is used to: transmit multiple Physical Random Access Channel (PRACH) signals, wherein the multiple PRACH resources used by the multiple PRACH signals correspond to multiple different downlink reference signals; wherein, a target PRACH resource among the multiple PRACH resources used by the multiple PRACH signals is associated with a quasi-co-address signal; the quasi-co-address signal is one or more of the multiple different downlink reference signals; the quasi-co-address signal is used by the terminal device to receive a first downlink signal, wherein the first downlink signal is a Msg2 message, a Msg3 retransmission scheduling information, or a Msg4 message. This terminal embodiment corresponds to the above-described terminal-side method embodiment, and all implementation processes and methods of the above method embodiments can be applied to this terminal embodiment and can achieve the same technical effect. Specifically, Figure 14 A schematic diagram of the hardware structure of the terminal device used to implement the embodiments of this application.

[0319] The terminal device 1400 includes, but is not limited to, at least some of the following components: radio frequency unit 1401, network module 1402, audio output unit 1403, input unit 1404, sensor 1405, display unit 1406, user input unit 1407, interface unit 1408, memory 1409, and processor 1410.

[0320] Those skilled in the art will understand that the terminal device 1400 may also include a power supply (such as a battery) for supplying power to various components. The power supply may be logically connected to the processor 1410 through a power management system, thereby enabling functions such as managing charging, discharging, and power consumption through the power management system. Figure 14The terminal device structure shown in the figure does not constitute a limitation on the terminal device. The terminal device may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0321] It should be understood that, in this embodiment, the input unit 1404 may include a graphics processing unit (GPU) 14041 and a microphone 14042. The GPU 14041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 1406 may include a display panel 14061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 1407 includes a touch panel 14071 and other input devices 14072. The touch panel 14071 is also called a touch screen. The touch panel 14071 may include a touch detection device and a touch controller. Other input devices 14072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, joysticks, etc., which will not be described in detail here.

[0322] In this embodiment, the radio frequency unit 1401 receives downlink data from the network-side device and processes it for the processor 1410; additionally, it sends uplink data to the network-side device. Typically, the radio frequency unit 1401 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, etc.

[0323] The memory 1409 can be used to store software programs or instructions and various data. The memory 1409 may primarily include a program or instruction storage area and a data storage area. The program or instruction storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 1409 may include high-speed random access memory and non-volatile memory, which may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. For example, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0324] Processor 1410 may include one or more processing units; optionally, processor 1410 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface, and applications or instructions, and the modem processor mainly handles wireless communication, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 1410.

[0325] The processor 1410 is used for:

[0326] Multiple Physical Random Access Channel (PRACH) signals are transmitted, wherein the multiple PRACH resources used by the multiple PRACH signals correspond to multiple different downlink reference signals;

[0327] Wherein, the target PRACH resource among the multiple PRACH resources used by the multiple PRACH signals is associated with a quasi-co-located signal; the quasi-co-located signal is one or more of the multiple different downlink reference signals; the quasi-co-located signal is used by the terminal device to receive a first downlink signal, the first downlink signal being a Msg2 message or a Msg3 retransmission scheduling information or a Msg4 message.

[0328] In this embodiment, by associating the target PRACH resource among the multiple PRACH resources used by the transmitted multiple PRACH signals with a quasi-co-address signal, multiple PRACHs can be transmitted using the target PRACH resource to indicate the quasi-co-address signal associated with the target PRACH resource. This ensures that the terminal and network-side equipment have a consistent understanding of the quasi-co-address signal, thereby effectively guaranteeing the successful transmission of downlink signals.

[0329] Optionally, the PRACH resource includes at least one of the following:

[0330] Physical random access channel opportunity (RO) resources;

[0331] Preamble;

[0332] The mapping period between the downlink reference signal and the RO resource.

[0333] Optionally, the first index of all said target PRACH resources associated with a quasi-co-address signal is the same.

[0334] Optionally, the first index of the target PRACH resource includes at least one of the following:

[0335] When the PRACH resource is the RO resource, the index of the RO resource in the first RO set corresponding to each of the plurality of different downlink reference signals, wherein the first RO set includes all RO resources mapped by one downlink reference signal;

[0336] or,

[0337] When the PRACH resource is the preamble, the first index of the target PRACH resource is: the index of the preamble in the first preamble set corresponding to each of the multiple different downlink reference signals, wherein the first preamble set includes available preambles within any RO resource mapped by the downlink reference signal, and the available preambles are determined by system message configuration;

[0338] or,

[0339] When the PRACH resource is the mapping period, the first index of the target PRACH resource is: the index of the mapping period within the first mapping pattern period corresponding to each of the multiple different downlink reference signals, wherein the first mapping pattern period contains multiple consecutive mapping periods, and the start time and duration of the first mapping pattern period are defined by the protocol or configured by system messages.

[0340] Optionally, the second index of the quasi-co-address signal is associated with the first index;

[0341] The second index is the index of the quasi-co-address signal among the plurality of different downlink reference signals.

[0342] Optionally, the association between the second index and the first index includes a mathematical relationship.

[0343] Optionally, the processor 1410 is further configured to: determine the quasi-co-address signal from the plurality of different downlink reference signals before the terminal device transmits the plurality of physical random access channel (PRACH) signals;

[0344] The terminal device determines the first index associated with the second index based on the second index of the quasi-co-address signal;

[0345] The terminal device determines the target PRACH resource of the plurality of PRACH signals based on the first index.

[0346] Optionally, the processor 1410 is also used for:

[0347] Based on the reference signal received power quality R, the downlink reference signal with the largest value of the reference signal received power quality is determined from the plurality of different downlink reference signals as the quasi-co-address signal.

[0348] Optionally, the processor 1410 is also used for:

[0349] In the case where a first downlink reference signal exists among the multiple different downlink reference signals, the terminal device randomly determines one downlink reference signal from the first downlink reference signal as the quasi-co-address signal, or the terminal device determines the first downlink reference signal with the largest value of the received power quality of the reference signal from the first downlink reference signal as the quasi-co-address signal;

[0350] If the first downlink reference signal is not present among the plurality of different downlink reference signals, the terminal device randomly determines one downlink reference signal from the plurality of different downlink reference signals as the quasi-co-address signal, or the terminal device determines the downlink reference signal with the largest received power quality value from the plurality of different downlink reference signals as the quasi-co-address signal;

[0351] Wherein, the first downlink reference signal is a downlink reference signal whose received power quality value is greater than a first threshold.

[0352] Optionally, the processor 1410 is also used for:

[0353] Randomly determine multiple PRACH resources and send the multiple PRACH signals;

[0354] The method further includes:

[0355] The terminal device determines the quasi-co-address signal based on a target PRACH resource among the randomly determined plurality of PRACH resources.

[0356] This application embodiment also provides a network-side device, including a processor and a communication interface, wherein the processor is used for:

[0357] Based on the target PRACH resource, determine the quasi-co-address signal of the first downlink signal;

[0358] The first downlink signal is either Msg2 message, Msg3 retransmission scheduling information, or Msg4 message;

[0359] The communication interface is used for:

[0360] Receive multiple PRACH signals, wherein the multiple PRACH resources used by the multiple PRACH signals are respectively associated with multiple different downlink reference signals; wherein, the target PRACH resource among the multiple PRACH resources is associated with a quasi-co-address signal; the quasi-co-address signal is one or more of the multiple different downlink reference signals.

[0361] This network-side device embodiment corresponds to the above-described network-side device method embodiment. All implementation processes and methods of the above-described method embodiment can be applied to this network-side device embodiment and can achieve the same technical effect.

[0362] Specifically, embodiments of this application also provide a network-side device. Figure 15 A schematic diagram of the hardware structure of the network-side device to implement the embodiments of this application. (See attached diagram.) Figure 15 As shown, the network device 1500 includes: an antenna 1501, a radio frequency (RF) device 1502, and a baseband device 1503. The antenna 1501 is connected to the RF device 1502. In the uplink direction, the RF device 1502 receives information through the antenna 1501 and transmits the received information to the baseband device 1503 for processing. In the downlink direction, the baseband device 1503 processes the information to be transmitted and sends it to the RF device 1502. The RF device 1502 processes the received information and transmits it through the antenna 1501.

[0363] The aforementioned frequency band processing device can be located in the baseband device 1503. The method executed by the network-side device in the above embodiments can be implemented in the baseband device 1503, which includes a processor 1504 and a memory 1505.

[0364] The baseband device 1503 may, for example, include at least one baseband board on which multiple chips are disposed, such as... Figure 15 As shown, one of the chips, for example, is a processor 1504, which is connected to a memory 1505 to call the program in the memory 1505 and execute the network device operation shown in the above method embodiment.

[0365] The baseband device 1503 may also include a network interface 1506 for exchanging information with the radio frequency device 1502, such as a common public radio interface (CPRI).

[0366] Specifically, the network-side device in this embodiment of the invention further includes: instructions or programs stored in memory 1505 and executable on processor 1504, wherein processor 1504 calls the instructions or programs in memory 1505 to execute. Figure 12The methods executed by each module shown achieve the same technical effect, and to avoid repetition, they will not be described in detail here.

[0367] Optionally, the processor 1504 is used for:

[0368] Based on the target PRACH resource, determine the quasi-co-address signal of the first downlink signal;

[0369] The first downlink signal is either Msg2 message, Msg3 retransmission scheduling information, or Msg4 message;

[0370] Optionally, the communication interface 1504 is used for:

[0371] Receive multiple PRACH signals, wherein the multiple PRACH resources used by the multiple PRACH signals are respectively associated with multiple different downlink reference signals; wherein, the target PRACH resource among the multiple PRACH resources is associated with a quasi-co-address signal; the quasi-co-address signal is one or more of the multiple different downlink reference signals.

[0372] In this embodiment, the network-side device determines the quasi-co-located signal based on the association between the target PRACH resource and the quasi-co-located signal among the multiple PRACH resources used by the received multiple PRACH signals, so as to ensure that the network-side device and the terminal have a consistent understanding of the quasi-co-located signal, thereby effectively ensuring the successful transmission of downlink signals.

[0373] Optionally, the PRACH resource includes at least one of the following:

[0374] Physical random access channel opportunity (RO) resources;

[0375] Preamble;

[0376] The mapping period between the downlink reference signal and the RO resource.

[0377] Optionally, the first index of all said target PRACH resources associated with a quasi-co-address signal is the same.

[0378] Optionally, the first index of the target PRACH resource includes at least one of the following:

[0379] When the PRACH resource is the RO resource, the first index of the target PRACH resource is: the index of the RO resource in the first RO set corresponding to each of the plurality of different downlink reference signals, wherein the first RO set includes all RO resources mapped by one downlink reference signal;

[0380] or,

[0381] When the PRACH resource is the preamble, the first index of the target PRACH resource is: the index of the preamble in the first preamble set corresponding to each of the multiple different downlink reference signals, wherein the first preamble set includes available preambles within any RO resource mapped by the downlink reference signal, and the available preambles are determined by system message configuration;

[0382] or,

[0383] When the PRACH resource is the mapping period, the first index of the target PRACH resource is: the index of the mapping period within the first mapping pattern period corresponding to each of the multiple different downlink reference signals, wherein the first mapping pattern period contains multiple consecutive mapping periods, and the start time and duration of the first mapping pattern period are defined by the protocol or configured by system messages.

[0384] Optionally, the second index of the quasi-co-address signal is associated with the first index;

[0385] The second index is the index of the quasi-co-address signal among the plurality of different downlink reference signals.

[0386] Optionally, the association between the second index and the first index includes a mathematical relationship.

[0387] In this embodiment, the network-side device determines the quasi-co-located signal based on the association between the target PRACH resource and the quasi-co-located signal among the multiple PRACH resources used by the received multiple PRACH signals, so as to ensure that the network-side device and the terminal have a consistent understanding of the quasi-co-located signal, thereby effectively ensuring the successful transmission of downlink signals.

[0388] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described random access method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0389] The processor mentioned above is the processor in the terminal device described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0390] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described random access method embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0391] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0392] This application also provides a computer program / program product, which is stored in a non-transient storage medium and executed by at least one processor to implement the various processes of the above-described random access method embodiments, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0393] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0394] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a communication device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0395] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A random access method, characterized in that, include: The terminal device sends multiple Physical Random Access Channel (PRACH) signals, and the multiple PRACH resources used by the multiple PRACH signals correspond to multiple different downlink reference signals; Wherein, the target PRACH resource among the multiple PRACH resources used by the multiple PRACH signals is associated with a quasi-co-address signal; the quasi-co-address signal is one or more of the multiple different downlink reference signals; the quasi-co-address signal is used by the terminal device to receive a first downlink signal, the first downlink signal being a Msg2 message or a Msg3 retransmission scheduling information or a Msg4 message; The terminal device sends multiple Physical Random Access Channel (PRACH) signals, including: The terminal device randomly determines multiple PRACH resources and sends the multiple PRACH signals. Before the terminal device sends multiple Physical Random Access Channel (PRACH) signals, the method further includes: The terminal device determines the quasi-co-address signal from the plurality of different downlink reference signals; The terminal device determines a first index associated with the second index based on the second index of the quasi-co-address signal; the second index of the quasi-co-address signal is determined by the terminal device based on the order of the quasi-co-address signal among multiple different downlink reference signals repeatedly transmitted by Msg1; The terminal device determines the target PRACH resource of the plurality of PRACH signals based on the first index.

2. The random access method according to claim 1, characterized in that, The PRACH resource includes at least one of the following: Physical random access channel opportunity (RO) resources; Preamble; The mapping period between the downlink reference signal and the RO resource.

3. The random access method according to claim 2, characterized in that, All the target PRACH resources associated with a quasi-co-address signal have the same first index.

4. The random access method according to claim 3, characterized in that, The first index of the target PRACH resource includes at least one of the following: When the PRACH resource is the RO resource, the first index of the target PRACH resource is: the index of the RO resource in the first RO set corresponding to each of the plurality of different downlink reference signals, wherein the first RO set includes all RO resources mapped by one downlink reference signal; or, When the PRACH resource is the preamble, the first index of the target PRACH resource is: the index of the preamble in the first preamble set corresponding to each of the multiple different downlink reference signals, wherein the first preamble set includes available preambles within any RO resource mapped by the downlink reference signal, and the available preambles are determined by system message configuration; or, When the PRACH resource is the mapping period, the first index of the target PRACH resource is: the index of the mapping period within the first mapping pattern period corresponding to each of the multiple different downlink reference signals, wherein the first mapping pattern period contains multiple consecutive mapping periods, and the start time and duration of the first mapping pattern period are defined by the protocol or configured by system messages.

5. The random access method according to any one of claims 1-4, characterized in that, The second index of the quasi-co-address signal is associated with the first index; The second index is the index of the quasi-co-address signal among the plurality of different downlink reference signals.

6. The random access method according to claim 5, characterized in that, The association between the second index and the first index includes a mathematical relationship.

7. The random access method according to claim 1, characterized in that, The terminal device determines the quasi-co-address signal from the plurality of different downlink reference signals, including: The terminal device determines the downlink reference signal with the highest reference signal reception quality value from the plurality of different downlink reference signals as the quasi-co-address signal.

8. The random access method according to claim 1, characterized in that, The terminal device determines the quasi-co-address signal from the plurality of different downlink reference signals, including: When a first downlink reference signal exists among the multiple different downlink reference signals, the terminal device randomly selects one downlink reference signal from the first downlink reference signal as the quasi-co-address signal, or the terminal device selects the first downlink reference signal with the largest value of the reference signal reception quality from the first downlink reference signal as the quasi-co-address signal; If the first downlink reference signal is not present among the plurality of different downlink reference signals, the terminal device randomly selects one downlink reference signal from the plurality of different downlink reference signals as the quasi-co-address signal, or the terminal device selects the downlink reference signal with the largest value of the received quality of the reference signal from the plurality of different downlink reference signals as the quasi-co-address signal; Wherein, the first downlink reference signal is a downlink reference signal whose received quality value is greater than a first threshold.

9. The random access method according to any one of claims 1-4 or 6, characterized in that, The method further includes: The terminal device determines the quasi-co-address signal based on a target PRACH resource among the randomly determined plurality of PRACH resources.

10. A random access method, characterized in that, include: The network-side device receives multiple PRACH signals, and the multiple PRACH resources used by the multiple PRACH signals are respectively associated with multiple different downlink reference signals; wherein, the target PRACH resource among the multiple PRACH resources is associated with a quasi-co-address signal; the quasi-co-address signal is one or more of the multiple different downlink reference signals; The network-side device determines the quasi-co-address signal of the first downlink signal based on the target PRACH resource; The first downlink signal is either Msg2 message, Msg3 retransmission scheduling information, or Msg4 message; The multiple PRACH resources used by the multiple PRACH signals are randomly determined by the terminal device; The target PRACH resource of the plurality of PRACH signals is determined based on a first index, and the second index of the quasi-co-address signal is the order of the quasi-co-address signal in a plurality of different downlink reference signals repeatedly transmitted by the terminal device in Msg1; the second index of the quasi-co-address signal is associated with the first index.

11. The random access method according to claim 10, characterized in that, The PRACH resource includes at least one of the following: Physical random access channel opportunity (RO) resources; Preamble; The mapping period between the downlink reference signal and the RO resource.

12. The random access method according to claim 11, characterized in that, All the target PRACH resources associated with a quasi-co-address signal have the same first index.

13. The random access method according to claim 12, characterized in that, The first index of the target PRACH resource includes at least one of the following: When the PRACH resource is the RO resource, the first index of the target PRACH resource is: the index of the RO resource in the first RO set corresponding to each of the plurality of different downlink reference signals, wherein the first RO set includes all RO resources mapped by one downlink reference signal; or, When the PRACH resource is the preamble, the first index of the target PRACH resource is: the index of the preamble in the first preamble set corresponding to each of the multiple different downlink reference signals, wherein the first preamble set includes available preambles within any RO resource mapped by the downlink reference signal, and the available preambles are determined by system message configuration; or, When the PRACH resource is the mapping period, the first index of the target PRACH resource is: the index of the mapping period within the first mapping pattern period corresponding to each of the multiple different downlink reference signals, wherein the first mapping pattern period contains multiple consecutive mapping periods, and the start time and duration of the first mapping pattern period are defined by the protocol or configured by system messages.

14. The random access method according to any one of claims 10-13, characterized in that, The second index is the index of the quasi-co-address signal among the plurality of different downlink reference signals.

15. The random access method according to claim 14, characterized in that, The association between the second index and the first index includes a mathematical relationship.

16. A random access device, characterized in that, include: The first transmitting module is used to transmit multiple Physical Random Access Channel (PRACH) signals, wherein the multiple PRACH resources used by the multiple PRACH signals correspond to multiple different downlink reference signals. The target PRACH resource among the multiple PRACH resources used by the multiple PRACH signals is associated with a quasi-co-located signal; the quasi-co-located signal is one or more of the multiple different downlink reference signals; the quasi-co-located signal is used by the terminal device to receive a first downlink signal, which is a Msg2 message, a Msg3 retransmission scheduling information, or a Msg4 message; The first sending module is also used for: Randomly determine multiple PRACH resources and send the multiple PRACH signals; The device further includes: A first determining module is configured to determine the quasi-co-address signal from the plurality of different downlink reference signals before the terminal device sends a plurality of physical random access channel (PRACH) signals. The second determining module is configured to, before the terminal device transmits multiple Physical Random Access Channel (PRACH) signals, determine a first index associated with the second index of the quasi-co-address signal based on the second index of the quasi-co-address signal; the second index of the quasi-co-address signal is the order of the quasi-co-address signal among multiple different downlink reference signals repeatedly transmitted by the terminal device in Msg1; The third determining module is used to determine the target PRACH resource of the multiple PRACH signals based on the first index before the terminal device sends multiple physical random access channel (PRACH) signals.

17. The random access device according to claim 16, characterized in that, The PRACH resource includes at least one of the following: Physical random access channel opportunity (RO) resources; Preamble; The mapping period between the downlink reference signal and the RO resource.

18. The random access device according to claim 17, characterized in that, All the target PRACH resources associated with a quasi-co-address signal have the same first index.

19. The random access device according to claim 18, characterized in that, The first index of the target PRACH resource includes at least one of the following: When the PRACH resource is the RO resource, the first index of the target PRACH resource is: the index of the RO resource in the first RO set corresponding to each of the plurality of different downlink reference signals, wherein the first RO set includes all RO resources mapped by one downlink reference signal; or, When the PRACH resource is the preamble, the first index of the target PRACH resource is: the index of the preamble in the first preamble set corresponding to each of the multiple different downlink reference signals, wherein the first preamble set includes available preambles within any RO resource mapped by the downlink reference signal, and the available preambles are determined by system message configuration; or, When the PRACH resource is the mapping period, the first index of the target PRACH resource is: the index of the mapping period within the first mapping pattern period corresponding to each of the multiple different downlink reference signals, wherein the first mapping pattern period contains multiple consecutive mapping periods, and the start time and duration of the first mapping pattern period are defined by the protocol or configured by system messages.

20. The random access device according to any one of claims 16-19, characterized in that, The second index of the quasi-co-address signal is associated with the first index; The second index is the index of the quasi-co-address signal among the plurality of different downlink reference signals.

21. The random access device according to claim 20, characterized in that, The association between the second index and the first index includes a mathematical relationship.

22. The random access device according to claim 16, characterized in that, The first determining module is further configured to: The downlink reference signal with the highest received quality value among the plurality of different downlink reference signals is determined as the quasi-co-address signal.

23. The random access device according to claim 16, characterized in that, The first determining module is further configured to: When a first downlink reference signal exists among the multiple different downlink reference signals, the terminal device randomly selects one downlink reference signal from the first downlink reference signal as the quasi-co-address signal, or the terminal device selects the first downlink reference signal with the largest value of the reference signal reception quality from the first downlink reference signal as the quasi-co-address signal; If the first downlink reference signal is not present among the plurality of different downlink reference signals, the terminal device randomly selects one downlink reference signal from the plurality of different downlink reference signals as the quasi-co-address signal, or the terminal device selects the downlink reference signal with the largest value of the received quality of the reference signal from the plurality of different downlink reference signals as the quasi-co-address signal; Wherein, the first downlink reference signal is a downlink reference signal whose received quality value is greater than a first threshold.

24. The random access device according to any one of claims 16-19 or 21, characterized in that, The first sending module is also used for: The quasi-co-location signal is determined based on the target PRACH resource among the randomly determined plurality of PRACH resources.

25. A random access device, characterized in that, include: A first receiving module is configured to receive multiple PRACH signals, wherein the multiple PRACH signals use multiple PRACH resources that are respectively associated with multiple different downlink reference signals; wherein, a target PRACH resource among the multiple PRACH resources is associated with a quasi-co-address signal; the quasi-co-address signal is one or more of the multiple different downlink reference signals; The fourth determining module is used to determine the quasi-co-address signal of the first downlink signal based on the target PRACH resource; The first downlink signal is either Msg2 message, Msg3 retransmission scheduling information, or Msg4 message; The multiple PRACH resources used by the multiple PRACH signals are randomly determined by the terminal device; The target PRACH resource of the plurality of PRACH signals is determined based on a first index, and the second index of the quasi-co-address signal is the order of the quasi-co-address signal in a plurality of different downlink reference signals repeatedly transmitted by the terminal device in Msg1; the second index of the quasi-co-address signal is associated with the first index.

26. The random access device according to claim 25, characterized in that, The PRACH resource includes at least one of the following: Physical random access channel opportunity (RO) resources; Preamble; The mapping period between the downlink reference signal and the RO resource.

27. The random access device according to claim 26, characterized in that, All the target PRACH resources associated with a quasi-co-address signal have the same first index.

28. The random access device according to claim 27, characterized in that, The first index of the target PRACH resource includes at least one of the following: When the PRACH resource is the RO resource, the first index of the target PRACH resource is: the index of the RO resource in the first RO set corresponding to each of the plurality of different downlink reference signals, wherein the first RO set includes all RO resources mapped by one downlink reference signal; or, When the PRACH resource is the preamble, the first index of the target PRACH resource is: the index of the preamble in the first preamble set corresponding to each of the multiple different downlink reference signals, wherein the first preamble set includes available preambles within any RO resource mapped by the downlink reference signal, and the available preambles are determined by system message configuration; or, When the PRACH resource is the mapping period, the first index of the target PRACH resource is: the index of the mapping period within the first mapping pattern period corresponding to each of the multiple different downlink reference signals, wherein the first mapping pattern period contains multiple consecutive mapping periods, and the start time and duration of the first mapping pattern period are defined by the protocol or configured by system messages.

29. The random access device according to any one of claims 25-28, characterized in that, The second index is the index of the quasi-co-address signal among the plurality of different downlink reference signals.

30. The random access device according to claim 29, characterized in that, The association between the second index and the first index includes a mathematical relationship.

31. A terminal, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the random access method as described in any one of claims 1 to 9.

32. A network-side device, characterized in that, It includes a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, implement the steps of the random access method as described in any one of claims 10 to 15.

33. A readable storage medium, characterized in that, The readable storage medium stores a program or instructions that, when executed by a processor, implement the steps of the random access method as described in any one of claims 1 to 9, or implement the steps of the random access method as described in any one of claims 10 to 15.

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