Random access method and apparatus, terminal and network side device

Abstract

The present application relates to the technical field of communications, and discloses a random access method and apparatus, a terminal and a network side device. The random access method comprises: a terminal selects a first PRACH sequence generated on the basis of a first PRACH attribute; and the terminal uses the first PRACH sequence to perform random access, wherein an association relationship between the first PRACH sequence and a reference signal satisfies at least one of the following: the first PRACH sequence and a second PRACH sequence are independently or jointly associated with the reference signal; the association relationship between the first PRACH sequence and the reference signal is obtained by means of an association relationship between the second PRACH sequence and the reference signal; the reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence; and a first reference signal associated with the first PRACH sequence is the same as a first reference signal associated with the second PRACH sequence, and a second reference signal associated with the first PRACH sequence is different from a second reference signal associated with the second PRACH sequence.

Description

Random access method, device, terminal and network side equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202410042522.1 filed in China on January 10, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of communication technology, and specifically relates to a random access method, apparatus, terminal and network-side equipment. Background Art

[0004] In a communication network, many terminals may need to use random access simultaneously or within a short period of time. For example, in non-terrestrial networks (NTNs), satellite handovers may require many or even all terminals to quickly switch to a new satellite through random access (e.g., cell handover, beam switching, or uplink resynchronization). This can lead to random access resource conflicts and random access failures. Therefore, improving the success rate of random access is an urgent issue. Summary of the Invention

[0005] The embodiments of the present application provide a random access method, apparatus, terminal, and network-side equipment, which can solve the problem of how to improve the success rate of random access.

[0006] In a first aspect, a random access method is provided, performed by a terminal, the method including:

[0007] The terminal selects a first PRACH sequence generated based on a first physical random access channel PRACH attribute;

[0008] The terminal performs random access by using the first PRACH sequence;

[0009] The association relationship between the first PRACH sequence and the reference signal satisfies at least one of the following:

[0010] The first PRACH sequence and the second PRACH sequence are independently associated to a reference signal;

[0011] The first PRACH sequence and the second PRACH sequence are associated with a reference signal;

[0012] The association relationship between the first PRACH sequence and the reference signal is obtained by the association relationship between the second PRACH sequence and the reference signal;

[0013] The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence;

[0014] The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

[0015] In a second aspect, a random access method is provided, which is performed by a network-side device. The method includes:

[0016] The network side device sends first information to the terminal;

[0017] The first information is used to assist the terminal in selecting a first PRACH sequence generated based on a first PRACH attribute, the first PRACH sequence is used for random access, and an association relationship between the first PRACH sequence and a reference signal satisfies at least one of the following:

[0018] The first PRACH sequence and the second PRACH sequence are independently associated to a reference signal;

[0019] The first PRACH sequence and the second PRACH sequence are associated with a reference signal;

[0020] The association relationship between the first PRACH sequence and the reference signal is obtained by the association relationship between the second PRACH sequence and the reference signal;

[0021] The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence;

[0022] The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

[0023] In a third aspect, a random access device is provided, applied to a terminal, including:

[0024] A selection module, configured to select a first PRACH sequence generated based on a first PRACH attribute;

[0025] an access module, configured to perform random access using the first PRACH sequence;

[0026] The association relationship between the first PRACH sequence and the reference signal satisfies at least one of the following:

[0027] The first PRACH sequence and the second PRACH sequence are independently associated to a reference signal;

[0028] The first PRACH sequence and the second PRACH sequence are associated with a reference signal;

[0029] The association relationship between the first PRACH sequence and the reference signal is obtained by the association relationship between the second PRACH sequence and the reference signal;

[0030] The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence;

[0031] The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

[0032] In a fourth aspect, a random access device is provided, which is applied to a network-side device, including:

[0033] A sending module, configured to send first information to a terminal;

[0034] The first information is used to assist the terminal in selecting a first PRACH sequence generated based on a first PRACH attribute, the first PRACH sequence is used for random access, and an association relationship between the first PRACH sequence and a reference signal satisfies at least one of the following:

[0035] The first PRACH sequence and the second PRACH sequence are independently associated to a reference signal;

[0036] The first PRACH sequence and the second PRACH sequence are associated with a reference signal;

[0037] The association relationship between the first PRACH sequence and the reference signal is obtained by the association relationship between the second PRACH sequence and the reference signal;

[0038] The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence;

[0039] The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

[0040] In a fifth aspect, a terminal is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0041] In a sixth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the processor is used to select a first PRACH sequence generated based on a first physical random access channel (PRACH) attribute, and use the first PRACH sequence for random access; the association relationship between the first PRACH sequence and the reference signal satisfies at least one of the following: the first PRACH sequence and the second PRACH sequence are independently associated with the reference signal; the first PRACH sequence and the second PRACH sequence are associated with the reference signal together; the association relationship between the first PRACH sequence and the reference signal is obtained through the association relationship between the second PRACH sequence and the reference signal; the reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence; the first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

[0042] In the seventh aspect, a network side device is provided, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the second aspect are implemented.

[0043] In the eighth aspect, a network side device is provided, including a processor and a communication interface, wherein the communication interface is used to send first information to a terminal; the first information is used to assist the terminal in selecting a first PRACH sequence generated based on a first PRACH attribute, and the first PRACH sequence is used for random access.

[0044] In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0045] In the tenth aspect, a wireless communication system is provided, comprising: a terminal and a network side device, wherein the terminal can be used to execute the steps of the method described in the first aspect, and the network side device can be used to execute the steps of the method described in the second aspect.

[0046] In the eleventh aspect, a chip is provided, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs 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.

[0047] In the twelfth aspect, a computer program / program product is provided, which is stored in a storage medium and is executed by at least one processor 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.

[0048] In a thirteenth aspect, a terminal is provided, configured to implement the steps of the method described in the first aspect.

[0049] In a fourteenth aspect, a network side device is provided, which is configured to implement the steps of the method described in the second aspect.

[0050] Through the solution of the embodiment of the present application, PRACH attributes can be introduced to expand PRACH sequences such as preamble, thereby increasing the capacity of random access resources while reducing delay and minimizing additional resource overhead, thereby improving the random access success rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] FIG1 is a block diagram of a wireless communication system applicable to embodiments of the present application;

[0052] FIG2 is a flow chart of a random access method provided in an embodiment of the present application;

[0053] FIG3 is a flowchart of another random access method provided in an embodiment of the present application;

[0054] FIG4 is a schematic structural diagram of a random access device provided in an embodiment of the present application;

[0055] FIG5 is a schematic structural diagram of another random access device provided in an embodiment of the present application;

[0056] FIG6 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0057] FIG7 is a schematic structural diagram of a terminal provided in an embodiment of the present application;

[0058] FIG8 is a schematic structural diagram of a network-side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0060] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0061] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent; an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.

[0062] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, 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) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) systems. th Generation, 6G) communication system.

[0063] FIG1 is a block diagram of a wireless communication system applicable to an embodiment of the present application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device (Wearable Device), an aircraft (Flight Vehicle), a vehicle-mounted device (VUE), a ship-mounted device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), a game console, a personal computer (PC), an ATM, or a self-service machine, or other terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be called a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (WLAN) access point (AP) or a wireless fidelity (WiFi) node, etc.Among them, the base station can be referred to as Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home evolved Node B (home evolved Node B), Transmission Reception Point (TRP) or other appropriate terms in the relevant field. As long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0064] In an embodiment of the present application, a synchronization signal / physical broadcast channel block (SS / PBCH block, SSB, sometimes also simply referred to as SS block, synchronization signal block) may also be referred to as any module that includes at least one of a synchronization signal, a broadcast signal, a broadcast channel (Physical broadcast channel, PBCH), other system message downlink broadcast channels, or their control channels.

[0065] In the embodiment of the present application, a physical random access channel transmission opportunity (PRACH transmission occasion) may also be referred to as a physical random access channel opportunity (PRACH Occasion), abbreviated as RO. RO refers to the time-frequency resources required for transmitting a random access-related sequence.

[0066] In the embodiments of the present application, Random Access and RA may both refer to a random access process.

[0067] In the embodiments of the present application, multiple frequency division multiplexing (FDM) ROs can be configured at a time domain location for PRACH transmission. At a given moment, multiple ROs can be used for FDM. An RO is associated with the actual SSB being transmitted. One SSB can be associated with multiple ROs, or multiple SSBs can be associated with one RO.

[0068] In the embodiment of the present application, a physical random access channel (PRACH) resource may also be referred to as a PRACH sequence, a preamble, a preamble sequence, etc.

[0069] In the embodiment of the present application, the association of the reference signal with the PRACH sequence / preamble may also refer to: allocating or configuring the PRACH sequence / preamble to the reference signal, or allocating or configuring the corresponding reference signal to the PRACH sequence / preamble, or mapping the reference signal to the PRACH sequence / preamble.

[0070] The random access method, apparatus, terminal, and network-side device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through some embodiments and their application scenarios.

[0071] Please refer to FIG. 2 , which is a flowchart of a random access method provided in an embodiment of the present application. The method is executed by a terminal. As shown in FIG. 2 , the method includes the following steps:

[0072] Step 21: The terminal selects a first PRACH sequence generated based on the first PRACH attribute;

[0073] Step 22: The terminal performs random access using the first PRACH sequence.

[0074] In the embodiment of the present application, the random access may be non-contention random access or contention-based random access, etc.

[0075] Optionally, the first PRACH sequence may be referred to as a first PRACH sequence set, which includes one or more PRACH sequences. The first condition may be related to a random access triggering event, an RO condition, and the like.

[0076] Through the solution of the embodiment of the present application, PRACH attributes can be introduced to expand PRACH sequences such as preamble, thereby increasing the capacity of random access resources while reducing delay and minimizing additional resource overhead, thereby improving the random access success rate.

[0077] Optionally, the first PRACH attribute may include but is not limited to at least one of the following:

[0078] Scrambling; for example, the attribute identifier (ID) corresponding to the first PRACH sequence generated based on scrambling is a scrambling ID;

[0079] Spread spectrum; for example, the attribute ID corresponding to the first PRACH sequence generated based on the spread spectrum is a signature ID;

[0080] interweaving;

[0081] Root sequence used to generate the PRACH sequence; for example, when the PRACH sequence is a ZC sequence, additional roots can be introduced to generate more PRACH sequences;

[0082] Additional cyclic shifts for generating PRACH sequences. For example, when generating a PRACH sequence through cyclic shift, additional cyclic shifts can be introduced to generate more PRACH sequences. For example, if the cyclic shift of the basic PRACH sequence is 0 or 1, additional cyclic shifts of 2 and 3 can be introduced to generate the first PRACH sequence, thereby obtaining more PRACH sequences.

[0083] Additional initialization IDs used to generate PRACH sequences. For example, when the PRACH sequence is an m-sequence, a new initialization ID can be introduced to generate additional m-sequences. For example, if the initialization ID of a set of basic PRACH sequences, such as preamble 0 and preamble 1, is 0, then the initialization ID '1' can be introduced to generate more PRACH sequences.

[0084] Optionally, the identifier of the first PRACH attribute defines at least one value, so that the generated PRACH sequence set is equal to the basic PRACH sequence set. For example, when using a scrambling method, when the scrambling sequence is all 0s, the PRACH sequence after scrambling (such as XOR operation) is the same as the PRACH sequence before scrambling.

[0085] In an embodiment of the present application, for beam management in the random access phase, the basic PRACH sequence and the first PRACH sequence generated based on the first PRACH attribute need to be associated with a certain reference signal (such as SSB, Channel State Information Reference Signal (CSI-RS) or Sounding Reference Signal (SRS), etc.).

[0086] Optionally, in order to reduce interference between PRACH sequences, improve the flexibility of associating PRACH sequences with reference signals, and / or avoid PRACH sequences with poor mutual correlation from being sent using the same beam, the association relationship between the first PRACH sequence and the reference signal may satisfy at least one of the following:

[0087] (1) The first PRACH sequence and the second PRACH sequence are independently associated with a reference signal;

[0088] For example, if there are 64 first PRACH sequences and 64 second PRACH sequences associated with 128 SSBs, the corresponding association method can be: SSB 0, ..., SSB 63 are associated with 64 second PRACH sequences, and SSB 64, ..., SSB 127 are associated with 64 first PRACH sequences. With this association method, even for terminals that only support PRACH sequences generated with a certain attribute, the corresponding reference signal can be selected.

[0089] (2) The first PRACH sequence and the second PRACH sequence are associated with a reference signal;

[0090] This (2) can be understood as the association of the first PRACH sequence and the second PRACH sequence together to perform the association of the PRACH sequence to the reference signal. For example, if there are 64 first PRACH sequences and 64 second PRACH sequences, which are associated with 128 SSBs, the corresponding association method can be: SSB 0, ..., SSB 127 are associated with 64 second PRACH sequences, and every two SSBs are associated with one second PRACH sequence; SSB 0, ..., SSB 127 are associated with 64 first PRACH sequences, and every two SSBs are associated with one first PRACH sequence. Through this association method, the complexity of the association can be reduced, and certain reference signals can also be configured to be associated only with part of the PRACH sequences.

[0091] (3) The association relationship between the first PRACH sequence and the reference signal is obtained through the association relationship between the second PRACH sequence and the reference signal;

[0092] This (3) can also be expressed as follows: the association relationship between the first PRACH sequence and the reference signal is indirectly or implicitly obtained through the association relationship between the second PRACH sequence and the reference signal. For example, after the association relationship between the second PRACH sequence and the reference signal is known, the second PRACH sequence can be replaced with the first PRACH sequence to directly obtain the association relationship between the first PRACH sequence and the reference signal. In this way, the association / mapping of the reference signal to various new PRACH sequences can be avoided, thereby reducing resource configuration overhead.

[0093] (4) The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence;

[0094] For example, if a second PRACH sequence is associated with a certain SSB, the corresponding first PRACH sequence (such as a new sequence generated based on the second PRACH sequence) is not allowed to be associated with the SSB. This can prevent sequences with poor mutual correlation from being sent using the same beam, thereby reducing interference between PRACH sequences.

[0095] (5) The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

[0096] For example, taking the first reference signal as an SSB and the second reference signal as a CSI-RS, if a second PRACH sequence is associated with a certain SSB, and the corresponding first PRACH sequence (this first PRACH sequence is, for example, a new sequence generated based on the second PRACH sequence) is also associated with the SSB, then the CSI-RS associated with the second PRACH sequence must not be the same as the CSI-RS associated with the first PRACH sequence. This can prevent PRACH sequences with poor mutual correlation from being sent using the beam corresponding to the same second reference signal, thereby reducing interference between PRACH sequences.

[0097] Optionally, the second PRACH sequence includes but is not limited to at least one of the following:

[0098] 1) A basic PRACH sequence, such as a basic PRACH sequence used to generate a first PRACH sequence;

[0099] 2) A PRACH sequence generated based on a second PRACH attribute, i.e., a PRACH sequence generated based on a PRACH attribute different from the first PRACH attribute; the second PRACH attribute is different from the first PRACH attribute and may include at least one of the following: scrambling; spreading; interleaving; a root sequence used to generate the PRACH sequence; an additional cyclic shift used to generate the PRACH sequence; or an additional initialization identifier used to generate the PRACH sequence. For example, the first PRACH attribute is scrambling the PRACH sequence, and the second PRACH attribute is generating a new PRACH sequence using a root sequence different from the basic PRACH sequence.

[0100] In the embodiment of the present application, using or supporting the first PRACH attribute to generate a PRACH sequence requires meeting certain conditions. Optionally, the above-mentioned random access using the first PRACH sequence may include:

[0101] The terminal performs random access using the first PRACH sequence when a first condition is met; wherein the first condition includes but is not limited to at least one of the following:

[0102] The RO corresponding to the first PRACH sequence is at least an RO used for contention-based random access (CBRA). Considering that if the RO is a CFRA-specific RO, the random access capacity can be enhanced to a certain extent by relying on an additional RO configured specifically for CFRA, random access using the association of the enhanced reference signal to the PRACH resource can be limited based on the condition that the corresponding RO is at least an RO used for CBRA.

[0103] The first PRACH sequence is a PRACH sequence used for CFRA. Considering that in the CFRA scenario, the network side device can control which terminals use the same preamble and different associated reference signals to reduce interference between PRACH signals sent by these terminals, this condition can be introduced to limit the use of the enhanced reference signal to the association of the PRACH resource for random access.

[0104] The RO corresponding to the first PRACH sequence is at least an RO used for non-contention random access (Contention Free Random Access, CFRA);

[0105] The first PRACH sequence is a PRACH sequence used for CBRA;

[0106] The triggering event of random access corresponding to the first PRACH sequence includes at least one of the following: network triggering; terminal triggering; Radio Resource Control (RRC) signaling triggering; Medium Access Control (MAC) layer triggering; physical layer signaling triggering; paging triggering; initial access; RRC connection reestablishment; synchronous reconfiguration or handover, such as large-area terminal reconfiguration or handover; access in RRC inactive state (such as RRC_INACTIVE); PRACH transmission for requesting, activating or deactivating the first system message; in RRC connected state (such as RRC_connected), uplink (UL) data arrives, but there is no Physical Uplink Control Channel (PUCCH) resource for Scheduling Request (SR); SR failure, such as Scheduling Request exceeds the maximum number of transmissions (SR Max Transmission reached), and the Physical Uplink Shared Channel (PUCCH) is regained through the random access process. Channel (PUSCH) resources; Beam Failure recovery; In RRC connected state (such as RRC_connected), uplink (UL) data arrives, but the terminal is in an out-of-sync state in the uplink; In RRC connected state (such as RRC_connected), downlink (DL) data arrives, but the terminal is in an out-of-sync state in the uplink; Timing alignment during the addition of a secondary cell (SCell); User data transmission triggering in idle or inactive state; Two-step random access, such as 2-step RACH; Four-step random access, such as 4-step RACH; The first system message includes at least one of the following: a system message on the current cell (such as SSB, SIB1 or other system message), a system message on other cells different from the current cell (such as SSB, SIB1 or other system message), a system message on this part of the bandwidth (such as SSB, SIB1 or other system message), and a system message on other parts of the bandwidth different from the current part of the bandwidth (such as SSB, SIB1 or other system message);

[0107] A measurement value of a downlink signal by the terminal is greater than or equal to (or not less than) a first threshold; the first threshold may be configured by the network or specified by a protocol; the measurement value may be, but is not limited to, a reference signal received power (RSRP), a reference signal received quality (RSRQ), a signal-to-noise ratio (SNR), a signal-to-interference plus noise ratio (SINR), etc.

[0108] The terminal has the ability to select one or more enhanced preambles;

[0109] The terminal receives a back-off indication.

[0110] Optionally, upon receiving the fallback indication, the terminal may select the first PRACH sequence at a different time point. The selection of the first PRACH sequence generated based on the first PRACH attribute may include at least one of the following:

[0111] (a) Before a backoff time, the terminal selects a first PRACH sequence generated based on a first PRACH attribute. The backoff time may be the time the terminal needs to wait after the end of a random access response window (RAR window) to retransmit the PRACH or MsgA. The main reason for introducing the backoff time is insufficient network resource capacity. In the case of congestion, for CBRA, it is necessary to further postpone the retransmission time of the PRACH or MsgA. In (a), since the introduction of the first PRACH sequence increases the random access resource capacity, it is not necessary to wait for the backoff time. That is, before the backoff time, the first PRACH sequence generated based on the first PRACH attribute is selected.

[0112] (b) After a backoff time, the terminal selects a first PRACH sequence generated based on the first PRACH attribute; the backoff time may be the time after the random access response time window (RAR window) ends that the terminal needs to wait to retransmit the PRACH or MsgA;

[0113] (c) After receiving the back-off indication, the terminal selects the first PRACH sequence generated based on the first PRACH attribute to use the enhanced PRACH sequence in the next PRACH transmission;

[0114] (d) after receiving the fallback indication and after a delay of at least a first time length, the terminal selects a first PRACH sequence generated based on the first PRACH attribute; wherein the first time length may be configured by the network, specified by a protocol, or determined based on at least one of downlink signal processing time or times, uplink signal preparation time or times, MAC layer processing time, fixed delay, partial bandwidth switching delay, uplink switching time interval, etc.;

[0115] (e) After receiving the fallback indication and after the time window of the random access response RAR or MsgB ends, the terminal selects the first PRACH sequence generated based on the first PRACH attribute.

[0116] Optionally, corresponding thresholds can be independently configured for reference signals associated with different PRACH sequences. The second threshold corresponding to the reference signal associated with the first PRACH sequence and the third threshold corresponding to the reference signal associated with the third PRACH sequence can meet the first feature; wherein the second threshold and the third threshold are thresholds of reference signal measurement values ​​(such as RSRP, RSRP, SNR, SINR, etc.) used for random access resource selection, which can be configured by the network or specified by the protocol; the third PRACH sequence includes at least one of the following: a basic PRACH sequence used to generate the first PRACH sequence, a PRACH sequence not enhanced based on the first PRACH attribute, and a PRACH sequence enhanced based on a third PRACH attribute (different from the first PRACH attribute).

[0117] Optionally, the first feature includes at least one of the following:

[0118] The second threshold and the third threshold are configured independently;

[0119] The second threshold is equal to the third threshold plus a first offset value, where the first offset value is configured by the network or specified by the protocol;

[0120] The third threshold is equal to the second threshold plus a second offset value, where the second offset value is configured by the network or specified by the protocol;

[0121] The second threshold is equal to the third threshold;

[0122] The second threshold is greater than or equal to the third threshold; thereby, it can be ensured that only terminals with relatively good link conditions can select the extended PRACH sequence and the basic PRACH sequence on which it is based, thereby reducing the probability of conflict.

[0123] For example, assume there are two SSBs, SSB 0 and SSB 1, each associated with 16 preamble IDs: {SSB 0, preamble IDs 0-15} and {SSB 1, preamble IDs 16-31}. The preamble associated with SSB 0 is scrambled to extend the preambles to 16 more preamble IDs: preamble IDs 31-47. In this case, SSB 0 is associated with / mapped to 32 preambles: {SSB 0, preamble IDs 0-15, 31-47}. For SSB 0, an SS-RSRP threshold SS_th0 can be defined to determine whether to select SSB 0 for PRACH resource selection. For SSB 1, an SS-RSRP threshold SS_th1 can be defined to determine whether to select SSB 1 for PRACH resource selection, where SS_th0 > SS_th1. This places a higher premium on selecting SSB 0 than on selecting SSB 1.

[0124] Please refer to FIG3 , which is a flowchart of a random access method provided in an embodiment of the present application. The method is performed by a network-side device. As shown in FIG3 , the method includes the following steps:

[0125] Step 31: The network-side device sends first information to the terminal; the first information is used to assist the terminal in selecting a first PRACH sequence generated based on a first PRACH attribute, and the first PRACH sequence is used for random access.

[0126] In the embodiment of the present application, the first information may be a first PRACH attribute, a first basic PRACH sequence for generating a first PRACH sequence, or a first PRACH sequence, etc. The first information may be delivered via physical layer signaling, MAC layer signaling, etc.

[0127] Optionally, the first PRACH sequence may be referred to as a first PRACH sequence set, which includes one or more PRACH sequences. The first condition may be related to a random access triggering event, an RO condition, and the like.

[0128] Through the solution of the embodiment of the present application, PRACH attributes can be introduced to expand PRACH sequences such as preamble, thereby increasing the capacity of random access resources while reducing delay and minimizing additional resource overhead, thereby improving the random access success rate.

[0129] Optionally, the first PRACH attribute may include but is not limited to at least one of the following:

[0130] Scrambling; for example, the attribute identifier ID corresponding to the first PRACH sequence generated based on scrambling is the scrambling ID;

[0131] Spread spectrum; for example, the attribute ID corresponding to the first PRACH sequence generated based on the spread spectrum is a signature ID;

[0132] interweaving;

[0133] Root sequence used to generate the PRACH sequence; for example, when the PRACH sequence is a ZC sequence, additional roots can be introduced to generate more PRACH sequences;

[0134] Additional cyclic shifts for generating PRACH sequences. For example, when generating a PRACH sequence through cyclic shifts, additional cyclic shifts can be introduced to generate more PRACH sequences.

[0135] An additional initialization ID used to generate a PRACH sequence; for example, when the PRACH sequence is an m-sequence, a new initialization ID can be introduced to generate an additional m-sequence.

[0136] Optionally, the identifier of the first PRACH attribute defines at least one value, so that the generated PRACH sequence set is equal to the basic PRACH sequence set. For example, when using a scrambling method, when the scrambling sequence is all 0s, the PRACH sequence after scrambling (such as XOR operation) is the same as the PRACH sequence before scrambling.

[0137] In an embodiment of the present application, for beam management in the random access phase, the basic PRACH sequence and the first PRACH sequence generated based on the first PRACH attribute need to be associated with a certain reference signal. In order to reduce interference between PRACH sequences, improve the flexibility of associating the PRACH sequence with the reference signal, and / or avoid PRACH sequences with poor mutual correlation from being sent using the same beam, the association relationship between the first PRACH sequence and the reference signal may satisfy at least one of the following:

[0138] (1) The first PRACH sequence and the second PRACH sequence are independently associated with a reference signal;

[0139] For example, if there are 64 first PRACH sequences and 64 second PRACH sequences associated with 128 SSBs, the corresponding association method can be: SSB 0, ..., SSB 63 are associated with 64 second PRACH sequences, and SSB 64, ..., SSB 127 are associated with 64 first PRACH sequences. With this association method, even for terminals that only support PRACH sequences generated with a certain attribute, the corresponding reference signal can be selected.

[0140] (2) The first PRACH sequence and the second PRACH sequence are associated with a reference signal;

[0141] This (2) can be understood as the association of the first PRACH sequence and the second PRACH sequence together to perform the association of the PRACH sequence to the reference signal. For example, if there are 64 first PRACH sequences and 64 second PRACH sequences, which are associated with 128 SSBs, the corresponding association method can be: SSB 0, ..., SSB 127 are associated with 64 second PRACH sequences, and every two SSBs are associated with one second PRACH sequence; SSB 0, ..., SSB 127 are associated with 64 first PRACH sequences, and every two SSBs are associated with one first PRACH sequence. Through this association method, the complexity of the association can be reduced, and certain reference signals can also be configured to be associated only with part of the PRACH sequences.

[0142] (3) The association relationship between the first PRACH sequence and the reference signal is obtained through the association relationship between the second PRACH sequence and the reference signal;

[0143] This (3) can also be expressed as follows: the association relationship between the first PRACH sequence and the reference signal is indirectly or implicitly obtained through the association relationship between the second PRACH sequence and the reference signal. For example, after the association relationship between the second PRACH sequence and the reference signal is known, the second PRACH sequence can be replaced with the first PRACH sequence to directly obtain the association relationship between the first PRACH sequence and the reference signal. In this way, the association / mapping of the reference signal to various new PRACH sequences can be avoided, thereby reducing resource configuration overhead.

[0144] (4) The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence;

[0145] For example, if a second PRACH sequence is associated with a certain SSB, the corresponding first PRACH sequence (such as a new sequence generated based on the second PRACH sequence) is not allowed to be associated with the SSB. This can prevent sequences with poor mutual correlation from being sent using the same beam, thereby reducing interference between PRACH sequences.

[0146] (5) The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

[0147] For example, taking the first reference signal as an SSB and the second reference signal as a CSI-RS, if a second PRACH sequence is associated with a certain SSB, and the corresponding first PRACH sequence (this first PRACH sequence is, for example, a new sequence generated based on the second PRACH sequence) is also associated with the SSB, then the CSI-RS associated with the second PRACH sequence must not be the same as the CSI-RS associated with the first PRACH sequence. This can prevent PRACH sequences with poor mutual correlation from being sent using the beam corresponding to the same second reference signal, thereby reducing interference between PRACH sequences.

[0148] Optionally, the second PRACH sequence includes but is not limited to at least one of the following:

[0149] 1) A basic PRACH sequence, such as a basic PRACH sequence used to generate a first PRACH sequence;

[0150] 2) A PRACH sequence generated based on a second PRACH attribute, i.e., a PRACH sequence generated based on a PRACH attribute different from the first PRACH attribute; the second PRACH attribute is different from the first PRACH attribute and may include at least one of the following: scrambling; spreading; interleaving; a root sequence used to generate the PRACH sequence; an additional cyclic shift used to generate the PRACH sequence; or an additional initialization identifier used to generate the PRACH sequence. For example, the first PRACH attribute is scrambling the PRACH sequence, and the second PRACH attribute is generating a new PRACH sequence using a root sequence different from the basic PRACH sequence.

[0151] Optionally, the first PRACH sequence is used for random access when a first condition is met, where the first condition includes at least one of the following:

[0152] The RO corresponding to the first PRACH sequence is an RO used at least for CBRA;

[0153] The first PRACH sequence is a PRACH sequence used for CBRA;

[0154] The RO corresponding to the first PRACH sequence is an RO used at least for CFRA;

[0155] The first PRACH sequence is a PRACH sequence used for CFRA;

[0156] The triggering event of random access corresponding to the first PRACH sequence includes at least one of the following: network triggering; terminal triggering; RRC signaling triggering; media access control MAC layer triggering; physical layer signaling triggering; paging triggering; initial access; RRC connection reestablishment; synchronization reconfiguration or switching; access in RRC inactive state; PRACH transmission for requesting, activating or deactivating the first system message; in RRC connected state, uplink data arrives, but there is no PUCCH resource for SR; SR failure; beam failure recovery; in RRC connected state, uplink data arrives, but the terminal uplink is in a state of out-of-sync; in RRC connected state, downlink data arrives, but the terminal uplink is in a state of out-of-sync; timing alignment during SCell addition; user data transmission trigger in idle state or inactive state; two-step random access; four-step random access; wherein, the first system message includes at least one of the following: system message on this cell, system message on other cells different from this cell, system message on this part of bandwidth, system message on other parts of bandwidth different from this part of bandwidth;

[0157] A measurement value of the downlink signal by the terminal is greater than or equal to a first threshold;

[0158] The terminal has the ability to select one or more enhanced preambles;

[0159] The terminal receives a fallback indication.

[0160] Optionally, the second threshold corresponding to the reference signal associated with the first PRACH sequence and the third threshold corresponding to the reference signal associated with the third PRACH sequence satisfy the first feature; wherein the second threshold and the third threshold are thresholds of reference signal measurement values ​​for random access resource selection, and the third PRACH sequence includes at least one of the following: a basic PRACH sequence used to generate the first PRACH sequence, a PRACH sequence not enhanced based on the first PRACH attribute, and a PRACH sequence enhanced based on a third PRACH attribute;

[0161] The first feature includes at least one of the following:

[0162] The second threshold and the third threshold are configured independently;

[0163] The second threshold is equal to the third threshold plus a first offset value, where the first offset value is configured by the network or specified by the protocol;

[0164] The third threshold is equal to the second threshold plus a second offset value, where the second offset value is configured by the network or specified by the protocol;

[0165] The second threshold is equal to the third threshold;

[0166] The second threshold is greater than or equal to the third threshold; thereby, it can be ensured that only terminals with relatively good link conditions can select the extended PRACH sequence and the basic PRACH sequence on which it is based, thereby reducing the probability of conflict.

[0167] The random access method provided in the embodiment of the present application may be executed by a random access device. In the embodiment of the present application, the random access device provided in the embodiment of the present application is described by taking the random access method executed by the random access device as an example.

[0168] Please refer to FIG4 , which is a schematic structural diagram of a random access device provided in an embodiment of the present application. The device is applied to a terminal. As shown in FIG4 , the random access device 40 includes:

[0169] A selection module 41 is configured to select a first PRACH sequence generated based on a first PRACH attribute;

[0170] The access module 42 is configured to perform random access using the first PRACH sequence.

[0171] Optionally, the association relationship between the first PRACH sequence and the reference signal satisfies at least one of the following:

[0172] The first PRACH sequence and the second PRACH sequence are independently associated to a reference signal;

[0173] The first PRACH sequence and the second PRACH sequence are associated with a reference signal;

[0174] The association relationship between the first PRACH sequence and the reference signal is obtained by the association relationship between the second PRACH sequence and the reference signal;

[0175] The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence;

[0176] The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

[0177] Optionally, the second PRACH sequence includes at least one of the following:

[0178] Basic PRACH sequence;

[0179] A PRACH sequence is generated based on the second PRACH attribute.

[0180] Optionally, the access module 42 is specifically configured to perform random access using a first PRACH sequence when a first condition is met; the first condition includes at least one of the following:

[0181] The RO corresponding to the first PRACH sequence is an RO used at least for CBRA;

[0182] The first PRACH sequence is a PRACH sequence used for CBRA;

[0183] The RO corresponding to the first PRACH sequence is an RO used at least for CFRA;

[0184] The first PRACH sequence is a PRACH sequence used for CFRA;

[0185] The triggering event of random access corresponding to the first PRACH sequence includes at least one of the following: network triggering; terminal triggering; radio resource control RRC signaling triggering; media access control MAC layer triggering; physical layer signaling triggering; paging triggering; initial access; RRC connection reestablishment; synchronization reconfiguration or switching; access in RRC inactive state; PRACH transmission for requesting, activating or deactivating the first system message; in RRC connected state, uplink data arrives, but there is no physical uplink control channel PUCCH resource for scheduling request SR; SR failure; beam failure recovery; in RRC connected state, uplink data arrives, but the terminal uplink is in a state of out-of-sync; in RRC connected state, downlink data arrives, but the terminal uplink is in a state of out-of-sync; timing alignment during the addition of secondary cell SCell; user data transmission trigger in idle state or inactive state; two-step random access; four-step random access; wherein, the first system message includes at least one of the following: system message on this cell, system message on other cells different from this cell, system message on this part of bandwidth, system message on other parts of bandwidth different from this part of bandwidth;

[0186] A measurement value of the downlink signal by the terminal is greater than or equal to a first threshold;

[0187] The terminal has the ability to select one or more enhanced preambles;

[0188] The terminal receives a fallback indication.

[0189] Optionally, the selection module 41 is specifically configured to perform at least one of the following:

[0190] Before the backoff time, selecting a first PRACH sequence generated based on the first PRACH attribute;

[0191] After the backoff time, selecting a first PRACH sequence generated based on the first PRACH attribute;

[0192] After receiving the fallback indication, selecting a first PRACH sequence generated based on the first PRACH attribute;

[0193] After receiving the fallback indication and after a delay of at least a first time length, selecting a first PRACH sequence generated based on the first PRACH attribute;

[0194] After receiving the fallback indication and after the time window of the random access response or MsgB ends, selecting a first PRACH sequence generated based on the first PRACH attribute.

[0195] Optionally, the first PRACH attribute includes at least one of the following:

[0196] scrambling;

[0197] Spread spectrum;

[0198] interweaving;

[0199] Root sequence used to generate PRACH sequence;

[0200] Additional cyclic shifts used to generate PRACH sequences;

[0201] Additional initialization flag used to generate the PRACH sequence.

[0202] Optionally, the second threshold corresponding to the reference signal associated with the first PRACH sequence and the third threshold corresponding to the reference signal associated with the third PRACH sequence satisfy the first feature; wherein the second threshold and the third threshold are thresholds of reference signal measurement values ​​for random access resource selection, and the third PRACH sequence includes at least one of the following: a basic PRACH sequence used to generate the first PRACH sequence, a PRACH sequence not enhanced based on the first PRACH attribute, and a PRACH sequence enhanced based on a third PRACH attribute;

[0203] The first feature includes at least one of the following:

[0204] The second threshold and the third threshold are configured independently;

[0205] The second threshold is equal to the third threshold plus a first offset value, where the first offset value is configured by the network or specified by the protocol;

[0206] The third threshold is equal to the second threshold plus a second offset value, where the second offset value is configured by the network or specified by the protocol;

[0207] The second threshold is equal to the third threshold;

[0208] The second threshold is greater than or equal to the third threshold.

[0209] The random access device 40 in the embodiments of the present application can be an electronic device, such as an electronic device with an operating system, or a component of an electronic device, such as an integrated circuit or chip. The electronic device can be a terminal or other device other than a terminal. For example, the terminal can include but is not limited to the types of terminal 11 listed above. Other devices can include servers, network attached storage (NAS), etc., which are not specifically limited in the embodiments of the present application.

[0210] The random access device 40 provided in the embodiment of the present application can implement each process implemented by the method embodiment shown in Figure 2 and achieve the same technical effect. To avoid repetition, it will not be described here.

[0211] Please refer to FIG5 , which is a schematic diagram of the structure of a random access device provided in an embodiment of the present application. The device is applied to a network-side device. As shown in FIG5 , the random access device 50 includes:

[0212] The sending module 51 is configured to send first information to a terminal; the first information is used to assist the terminal in selecting a first PRACH sequence generated based on a first PRACH attribute, where the first PRACH sequence is used for random access.

[0213] Optionally, the association relationship between the first PRACH sequence and the reference signal satisfies at least one of the following:

[0214] The first PRACH sequence and the second PRACH sequence are independently associated to a reference signal;

[0215] The first PRACH sequence and the second PRACH sequence are associated with a reference signal;

[0216] The association relationship between the first PRACH sequence and the reference signal is obtained by the association relationship between the second PRACH sequence and the reference signal;

[0217] The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence;

[0218] The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

[0219] Optionally, the second PRACH sequence includes at least one of the following:

[0220] Basic PRACH sequence;

[0221] A PRACH sequence is generated based on the second PRACH attribute.

[0222] Optionally, the first PRACH sequence is used for random access when a first condition is met, where the first condition includes at least one of the following:

[0223] The RO corresponding to the first PRACH sequence is an RO used at least for CBRA;

[0224] The first PRACH sequence is a PRACH sequence used for CBRA;

[0225] The RO corresponding to the first PRACH sequence is an RO used at least for CFRA;

[0226] The first PRACH sequence is a PRACH sequence used for CFRA;

[0227] The triggering event of random access corresponding to the first PRACH sequence includes at least one of the following: network trigger; terminal trigger; RRC signaling trigger; MAC layer trigger; physical layer signaling trigger; paging trigger; initial access; RRC connection reestablishment; synchronization reconfiguration or switching; access in RRC inactive state; PRACH transmission for requesting, activating or deactivating the first system message; in RRC connected state, uplink data arrives, but there is no PUCCH resource for SR; SR failure; beam failure recovery; in RRC connected state, uplink data arrives, but the terminal uplink is in a state of out-of-sync; in RRC connected state, downlink data arrives, but the terminal uplink is in a state of out-of-sync; timing alignment during SCell addition; user data transmission trigger in idle state or inactive state; two-step random access; four-step random access; wherein, the first system message includes at least one of the following: system message on this cell, system message on other cells different from this cell, system message on this part of bandwidth, system message on other parts of bandwidth different from this part of bandwidth;

[0228] A measurement value of the downlink signal by the terminal is greater than or equal to a first threshold;

[0229] The terminal has the ability to select one or more enhanced preambles;

[0230] The terminal receives a fallback indication.

[0231] Optionally, the first PRACH attribute includes at least one of the following:

[0232] scrambling;

[0233] Spread spectrum;

[0234] interweaving;

[0235] Root sequence used to generate PRACH sequence;

[0236] Additional cyclic shifts used to generate PRACH sequences;

[0237] Additional initialization flag used to generate the PRACH sequence.

[0238] Optionally, the second threshold corresponding to the reference signal associated with the first PRACH sequence and the third threshold corresponding to the reference signal associated with the third PRACH sequence satisfy the first feature; wherein the second threshold and the third threshold are thresholds of reference signal measurement values ​​for random access resource selection, and the third PRACH sequence includes at least one of the following: a basic PRACH sequence used to generate the first PRACH sequence, a PRACH sequence not enhanced based on the first PRACH attribute, and a PRACH sequence enhanced based on a third PRACH attribute;

[0239] The first feature includes at least one of the following:

[0240] The second threshold and the third threshold are configured independently;

[0241] The second threshold is equal to the third threshold plus a first offset value, where the first offset value is configured by the network or specified by the protocol;

[0242] The third threshold is equal to the second threshold plus a second offset value, where the second offset value is configured by the network or specified by the protocol;

[0243] The second threshold is equal to the third threshold;

[0244] The second threshold is greater than or equal to the third threshold.

[0245] The random access device 50 provided in the embodiment of the present application can implement each process implemented by the method embodiment shown in Figure 3 and achieve the same technical effect. To avoid repetition, it will not be described here.

[0246] As shown in Figure 6, an embodiment of the present application further provides a communication device 60, including a processor 61 and a memory 62. The memory 62 stores a program or instruction that can be executed on the processor 61. For example, when the communication device 60 is a terminal, the program or instruction, when executed by the processor 61, implements the various steps of the above-mentioned random access method embodiment and can achieve the same technical effect. When the communication device 60 is a network-side device, the program or instruction, when executed by the processor 61, implements the various steps of the above-mentioned random access method embodiment and can achieve the same technical effect. To avoid repetition, it is not repeated here.

[0247] The present application also provides a terminal including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps in the method embodiment shown in FIG2 . This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment are applicable to this terminal embodiment and can achieve the same technical effects.

[0248] Specifically, FIG7 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

[0249] The terminal 700 includes but is not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709 and at least some of the components of the processor 710.

[0250] Those skilled in the art will appreciate that the terminal 700 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 710 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The terminal structure shown in FIG7 does not limit the terminal. The terminal may include more or fewer components than shown, or may combine certain components, or have different component arrangements, which will not be described in detail here.

[0251] It should be understood that in an embodiment of the present application, the input unit 704 may include a graphics processing unit (GPU) 7041 and a microphone 7042, and the graphics processing unit 7041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 706 may include a display panel 7061, and the display panel 7061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 707 includes a touch panel 7071 and at least one of other input devices 7072. The touch panel 7071 is also called a touch screen. The touch panel 7071 may include two parts: a touch detection device and a touch controller. Other input devices 7072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0252] In the embodiment of the present application, after receiving downlink data from a network-side device, the RF unit 701 may transmit the data to the processor 710 for processing. Furthermore, the RF unit 701 may send uplink data to the network-side device. Typically, the RF unit 701 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0253] The memory 709 can be used to store software programs or instructions and various data. The memory 709 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 709 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM), and a direct memory bus random access memory (DRRAM). The memory 709 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0254] Processor 710 may include one or more processing units. Optionally, processor 710 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 710.

[0255] The processor 710 is configured to select a first PRACH sequence generated based on a first PRACH attribute; and perform random access using the first PRACH sequence when a first condition is met.

[0256] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of the above-mentioned method embodiment and achieve the same or corresponding technical effects. To avoid repetition, it will not be repeated here.

[0257] The present application also provides a network-side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps of the method embodiment shown in FIG3 . This network-side device embodiment corresponds to the aforementioned network-side device method embodiment, and each implementation process and implementation method of the aforementioned method embodiment are applicable to this network-side device embodiment and can achieve the same technical effects.

[0258] Specifically, embodiments of the present application also provide a network-side device. As shown in Figure 8, the network-side device 80 includes an antenna 81, a radio frequency device 82, a baseband device 83, a processor 84, and a memory 85. Antenna 81 is connected to radio frequency device 82. In the uplink direction, radio frequency device 82 receives information via antenna 81 and sends the received information to baseband device 83 for processing. In the downlink direction, baseband device 83 processes the information to be transmitted and sends it to radio frequency device 82. Radio frequency device 82 processes the received information and then sends it through antenna 81.

[0259] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 83 , which includes a baseband processor.

[0260] The baseband device 83 may include, for example, at least one baseband board, on which multiple chips are arranged, as shown in Figure 8, one of the chips is, for example, a baseband processor, which is connected to the memory 85 through a bus interface to call the program in the memory 85 to execute the network device operations shown in the above method embodiment.

[0261] The network side device may further include a network interface 86, which is, for example, a Common Public Radio Interface (CPRI).

[0262] Specifically, the network side device 80 of the embodiment of the present application also includes: instructions or programs stored in the memory 85 and can be run on the processor 84. The processor 84 calls the instructions or programs in the memory 85 to execute the methods executed by each module shown in Figure 5 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0263] An embodiment of the present application further provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the random access method embodiment shown in FIG. 2 or the various processes of the random access method embodiment shown in FIG. 3 are implemented, and the same technical effect can be achieved. To avoid repetition, they are not described here.

[0264] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0265] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run a program or instruction to implement the various processes of the random access method embodiment shown in Figure 2 above, or to implement the various processes of the random access method embodiment shown in Figure 3 above, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0266] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0267] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the random access method embodiment shown in FIG. 2 , or the various processes of the random access method embodiment shown in FIG. 3 , and can achieve the same technical effects. To avoid repetition, they are not described here.

[0268] An embodiment of the present application also provides a communication system, including: a terminal and a network side device, wherein the terminal can be used to execute the steps of the random access method shown in Figure 2 above, and the network side device can be used to execute the steps of the random access method shown in Figure 3 above.

[0269] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0270] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0271] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A random access method, comprising: The terminal selects a first PRACH sequence generated based on the attributes of the first Physical Random Access Channel (PRACH); The terminal uses the first PRACH sequence for random access; Wherein, the association relationship between the first PRACH sequence and the reference signal satisfies at least one of the following: The first PRACH sequence and the second PRACH sequence are independently associated with the reference signal; The first PRACH sequence and the second PRACH sequence are jointly associated with the reference signal; The association relationship between the first PRACH sequence and the reference signal is obtained through the association relationship between the second PRACH sequence and the reference signal; The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence; The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

2. The method according to claim 1, wherein The second PRACH sequence includes at least one of the following: The basic PRACH sequence; The PRACH sequence generated based on the second PRACH attributes.

3. The method according to any one of claims 1 to 2, wherein, The terminal uses the first PRACH sequence for random access, including: The terminal uses the first PRACH sequence for random access when the first condition is met; wherein, the first condition includes at least one of the following: The Random Access Opportunity (RO) corresponding to the first PRACH sequence is an RO at least for CBRA; The first PRACH sequence is a PRACH sequence for CBRA; The RO corresponding to the first PRACH sequence is an RO at least for CFRA; The first PRACH sequence is a PRACH sequence for CFRA; The triggering events for random access corresponding to the first PRACH sequence include at least one of the following: network triggering; terminal triggering; Radio Resource Control (RRC) signaling triggering; Medium Access Control (MAC) layer triggering; physical layer signaling triggering; paging triggering; initial access; RRC connection reestablishment; synchronization reconfiguration or handover; access in the RRC inactive state; PRACH transmission for requesting, activating, or deactivating the first system message; in the RRC connected state, when uplink data arrives but there is no Physical Uplink Control Channel (PUCCH) resource for the Scheduling Request (SR); SR failure; beam failure recovery; in the RRC connected state, when uplink data arrives but the terminal is in an out-of-sync state in the uplink; in the RRC connected state, when downlink data arrives but the terminal is in an out-of-sync state in the uplink; timing alignment during Secondary Cell (SCell) addition; user data transmission triggering in the idle state or inactive state; two-step random access; four-step random access; wherein, the first system message includes at least one of the following: system message on this cell, system message on other cells different from this cell, system message on this part of the bandwidth, system message on other parts of the bandwidth different from this part of the bandwidth; The measurement value of the downlink signal by the terminal is greater than or equal to the first threshold; The terminal has the ability to select one or more enhanced preambles; The terminal receives a fallback indication.

4. The method according to any one of claims 1 to 3, wherein, The terminal selects a first PRACH sequence generated based on the first PRACH attribute, including at least one of the following: Before the fallback time, the terminal selects a first PRACH sequence generated based on the first PRACH attribute; After the fallback time, the terminal selects a first PRACH sequence generated based on the first PRACH attribute; After receiving the fallback indication, the terminal selects a first PRACH sequence generated based on the first PRACH attribute; After receiving the fallback indication and with a delay of at least the first time length, the terminal selects a first PRACH sequence generated based on the first PRACH attribute; After receiving the fallback indication and at the end of the time window of the random access response or MsgB, the terminal selects a first PRACH sequence generated based on the first PRACH attribute.

5. The method according to any one of claims 1 to 4, wherein The first PRACH attribute includes at least one of the following: Scrambling; Spreading; Interleaving; The root sequence for generating the PRACH sequence; The additional cyclic shift for generating the PRACH sequence; The additional initialization identifier for generating the PRACH sequence.

6. The method according to any one of claims 1 to 5, wherein The second threshold corresponding to the reference signal associated with the first PRACH sequence and the third threshold corresponding to the reference signal associated with the third PRACH sequence satisfy the first characteristic; wherein, the second threshold and the third threshold are thresholds for the measurement value of the reference signal for random access resource selection, and the third PRACH sequence includes at least one of the following: the basic PRACH sequence for generating the first PRACH sequence, the PRACH sequence not enhanced based on the first PRACH attribute, the PRACH sequence enhanced based on the third PRACH attribute; Wherein, the first characteristic includes at least one of the following: The second threshold and the third threshold are configured independently; The second threshold is equal to the third threshold plus the first offset value, and the first offset value is network-configured or protocol-specified; The third threshold is equal to the second threshold plus the second offset value, and the second offset value is network-configured or protocol-specified; The second threshold is equal to the third threshold; The second threshold is greater than or equal to the third threshold.

7. A random access method, including: The network-side device sends first information to the terminal; wherein, the first information is used to assist the terminal in selecting a first PRACH sequence generated based on the first PRACH attribute, and the first PRACH sequence is used for random access; The association relationship between the first PRACH sequence and the reference signal satisfies at least one of the following: The first PRACH sequence and the second PRACH sequence are independently associated with the reference signal; The first PRACH sequence and the second PRACH sequence are jointly associated with the reference signal; The association relationship between the first PRACH sequence and the reference signal is obtained through the association relationship between the second PRACH sequence and the reference signal; The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence; The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

8. The method according to claim 7, wherein The second PRACH sequence includes at least one of the following: Basic PRACH sequence; PRACH sequence generated based on the second PRACH attribute.

9. The method according to claim 7 or 8, wherein The first PRACH sequence is used for random access when the first condition is satisfied, and the first condition includes at least one of the following: The RO corresponding to the first PRACH sequence is an RO at least for CBRA; The first PRACH sequence is a PRACH sequence for CBRA; The RO corresponding to the first PRACH sequence is an RO at least for CFRA; The first PRACH sequence is a PRACH sequence for CFRA; The triggering events for random access corresponding to the first PRACH sequence include at least one of the following: network trigger; terminal trigger; RRC signaling trigger; Media Access Control MAC layer trigger; Physical layer signaling trigger; Paging trigger; Initial access; RRC connection reestablishment; Synchronization reconfiguration or handover; Access in RRC inactive state; PRACH transmission for requesting, activating or deactivating the first system message; In RRC connected state, uplink data arrives, but there is no PUCCH resource for SR; SR failure; Beam failure recovery; In RRC connected state, uplink data arrives, but the terminal is in an out-of-sync state in the uplink; In RRC connected state, downlink data arrives, but the terminal is in an out-of-sync state in the uplink; Timing alignment during SCell addition; User data transmission trigger in idle state or inactive state; Two-step random access; Four-step random access; Wherein, the first system message includes at least one of the following: system message on this cell, system message on other cells different from this cell, system message on this part of the bandwidth, system message on other parts of the bandwidth different from this part of the bandwidth; The measurement value of the terminal for the downlink signal is greater than or equal to the first threshold; The terminal has the ability to select one or more enhanced preambles; The terminal receives a fallback indication.

10. The method according to any one of claims 7 to 9, wherein The first PRACH attribute includes at least one of the following: Scrambling; Spreading; Interleaving; Root sequence for generating the PRACH sequence; Additional cyclic shift for generating the PRACH sequence; Additional initialization identifier for generating the PRACH sequence.

11. The method according to any one of claims 7 to 10, wherein The second threshold corresponding to the reference signal associated with the first PRACH sequence and the third threshold corresponding to the reference signal associated with the third PRACH sequence satisfy a first characteristic; wherein, the second threshold and the third threshold are thresholds of reference signal measurement values for random access resource selection, and the third PRACH sequence includes at least one of the following: a basic PRACH sequence for generating the first PRACH sequence, a PRACH sequence without enhancement based on the first PRACH attribute, and a PRACH sequence enhanced based on a third PRACH attribute; Wherein, the first characteristic includes at least one of the following: The second threshold and the third threshold are configured independently; The second threshold is equal to the third threshold plus a first offset value, and the first offset value is network-configured or specified by the protocol; The third threshold is equal to the second threshold plus a second offset value, and the second offset value is network-configured or specified by the protocol; The second threshold is equal to the third threshold; The second threshold is greater than or equal to the third threshold.

12. A random access device, comprising: A selection module, configured to select a first PRACH sequence generated based on a first PRACH attribute; An access module, configured to perform random access using the first PRACH sequence when a first condition is satisfied; Wherein, the association relationship between the first PRACH sequence and the reference signal satisfies at least one of the following: The first PRACH sequence and the second PRACH sequence are independently associated with the reference signal; The first PRACH sequence and the second PRACH sequence are jointly associated with the reference signal; The association relationship between the first PRACH sequence and the reference signal is obtained through the association relationship between the second PRACH sequence and the reference signal; The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence; The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

13. The apparatus according to claim 12, wherein, The first condition includes at least one of the following: The RO corresponding to the first PRACH sequence is at least an RO for CBRA; The first PRACH sequence is a PRACH sequence for CBRA; The RO corresponding to the first PRACH sequence is at least an RO for CFRA; The first PRACH sequence is a PRACH sequence for CFRA; The triggering events for random access corresponding to the first PRACH sequence include at least one of the following: network triggering; terminal triggering; RRC signaling triggering; media access control MAC layer triggering; physical layer signaling triggering; Paging triggering; Initial access; RRC connection reconstruction; synchronization reconfiguration or handover; access in RRC inactive state; PRACH transmission for requesting, activating, or deactivating the first system message; when in RRC connected state, uplink data arrives, but there is no PUCCH resource for SR; SR failure; beam failure recovery; In the RRC connected state, uplink data arrives, but the terminal is out of synchronization in the uplink; In the RRC connected state, downlink data arrives, but the terminal is out of synchronization in the uplink; timing alignment during SCell addition; Triggering of user data transmission in the idle state or inactive state; two-step random access; four-step random access; wherein, the first system message includes at least one of the following: system message on this cell, system message on other cells different from this cell, system message on this part of the bandwidth, system message on other parts of the bandwidth different from this part of the bandwidth; The measurement value of the terminal for the downlink signal is greater than or equal to the first threshold; The terminal has the ability to select one or more enhanced preambles; The terminal receives a fallback indication.

14. The apparatus according to claim 12 or 13, wherein, The first PRACH attribute includes at least one of the following: Scrambling; Spreading; Interleaving; Root sequence for generating the PRACH sequence; Additional cyclic shift for generating the PRACH sequence; Additional initialization identifier for generating the PRACH sequence.

15. The device according to any one of claims 12 to 14, wherein, The second threshold corresponding to the reference signal associated with the first PRACH sequence and the third threshold corresponding to the reference signal associated with the third PRACH sequence satisfy the first characteristic; wherein, the second threshold and the third threshold are thresholds for the measurement value of the reference signal for random access resource selection, and the third PRACH sequence includes at least one of the following: the basic PRACH sequence for generating the first PRACH sequence, the PRACH sequence not enhanced based on the first PRACH attribute, the PRACH sequence enhanced based on the third PRACH attribute; Wherein, the first characteristic includes at least one of the following: The second threshold and the third threshold are configured independently; The second threshold is equal to the third threshold plus a first offset value, and the first offset value is network-configured or protocol-specified; The third threshold is equal to the second threshold plus a second offset value, and the second offset value is network-configured or protocol-specified; The second threshold is equal to the third threshold; The second threshold is greater than or equal to the third threshold.

16. A random access device, comprising: A sending module, configured to send first information to a terminal; wherein, the first information is used to assist the terminal in selecting a first PRACH sequence generated based on a first PRACH attribute, and the first PRACH sequence is used for random access; Wherein, the association relationship between the first PRACH sequence and the reference signal satisfies at least one of the following: The first PRACH sequence and the second PRACH sequence are independently associated with the reference signal; The first PRACH sequence and the second PRACH sequence are jointly associated with the reference signal; The association relationship between the first PRACH sequence and the reference signal is obtained through the association relationship between the second PRACH sequence and the reference signal; The reference signal associated with the first PRACH sequence is different from the reference signal associated with the second PRACH sequence; The first reference signal associated with the first PRACH sequence is the same as the first reference signal associated with the second PRACH sequence, and the second reference signal associated with the first PRACH sequence is different from the second reference signal associated with the second PRACH sequence.

17. The apparatus according to claim 16, wherein, The first PRACH attribute includes at least one of the following: Scrambling; Spreading; Interleaving; The root sequence for generating the PRACH sequence; An additional cyclic shift for generating the PRACH sequence; An additional initialization identifier for generating the PRACH sequence.

18. A terminal, comprising a processor and a memory, where the memory stores a program or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the random access method according to any one of claims 1 to 6 are implemented.

19. A network-side device, comprising a processor and a memory, where the memory stores a program or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the random access method according to any one of claims 7 to 11 are implemented.

20. A readable storage medium, where a program or instructions are stored on the readable storage medium, and when the program or instructions are executed by a processor, the steps of the random access method according to any one of claims 1 to 6 are implemented, or the steps of the random access method according to any one of claims 7 to 11 are implemented.

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