Random access method, communication apparatus and storage medium

Abstract

The present disclosure relates to the field of communications. Provided are a random access method, a communication apparatus and a storage medium. The method comprises: sending a random access signal on a random access time-frequency resource, wherein the random access time-frequency resource comprises a plurality of symbols, and the plurality of symbols include full-duplex symbols and non-full-duplex symbols.

Description

Random access method, communication device and storage medium

[0001] Cross-references

[0002] The present invention claims priority to the Chinese patent application filed with the Patent Office of China on December 6, 2023, with application number 202311666773.9 and invention name “Random Access Method, Communication Device and Storage Medium”. The entire contents of the application are incorporated into the present invention by reference. Technical Field

[0003] The present disclosure relates to the field of communications, and in particular to a random access method, a communication device, and a storage medium. Background Art

[0004] In communication systems, full-duplex technology enables communication nodes to simultaneously transmit and receive on the same time-frequency resources. To achieve full-duplex communication, the communication system requires strict isolation between transmit and receive to prevent the transmitted signal from interfering with the received signal. This isolation may involve hardware switching, such as antenna switching and filter switching. Therefore, when switching to full-duplex mode, a new guard period (GP) may be required to prevent interference caused by hardware delays during the switching process.

[0005] When a new blank GP is introduced to facilitate full-duplex working mode switching, this GP will actually interrupt the original continuous signal transmission process. For example, it interrupts the transmission of the long-format physical random access channel (PRACH) signal used to improve the coverage capability of the PRACH signal. Since the PRACH signal requires continuous time resources to ensure sufficient signal strength and coverage range, this GP interrupts the continuous transmission of the PRACH signal and may reduce the coverage capability of the PRACH signal. Since the transmission of the PRACH signal determines whether the communication node (such as user equipment (UE)) can access the communication system normally, it is crucial to ensure the transmission of the PRACH signal in full-duplex mode.

[0006] Summary of the Invention

[0007] The embodiments of the present disclosure provide a random access method, a communication device, and a storage medium for ensuring the transmission of a PRACH signal in a full-duplex mode.

[0008] In a first aspect, a random access method is provided, which is applied to a first node. The method includes: sending a random access signal on a random access time-frequency resource, where the random access time-frequency resource includes multiple symbols, and the multiple symbols include full-duplex symbols and non-full-duplex symbols.

[0009] In a second aspect, a random access method is provided, which is applied to a second node. The method includes: detecting a random access signal on a random access time-frequency resource, where the random access time-frequency resource includes multiple symbols, and the multiple symbols include full-duplex symbols and non-full-duplex symbols.

[0010] According to a third aspect, a random access device is provided, which is applied to a first node and includes: a sending module for sending a random access signal on a random access time-frequency resource, where the random access time-frequency resource includes multiple symbols, and the multiple symbols include full-duplex symbols and non-full-duplex symbols.

[0011] In a fourth aspect, a random access device is provided, which is applied to a second node and includes: a detection module for detecting a random access signal on a random access time-frequency resource, where the random access time-frequency resource includes multiple symbols, and the multiple symbols include full-duplex symbols and non-full-duplex symbols.

[0012] In a fifth aspect, a communication device is provided, comprising: a memory and a processor; the memory and the processor are coupled; the memory is used to store a computer program; and the processor implements the random access method of any of the above embodiments when executing the computer program.

[0013] In a sixth aspect, a computer-readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed by a processor, the random access method of any of the above embodiments is implemented.

[0014] In a seventh aspect, a computer program product is provided, which includes computer program instructions, and when the computer program instructions are executed by a processor, the random access method of any of the above embodiments is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] FIG1 is a schematic diagram of a communication system provided by some embodiments of the present disclosure;

[0017] FIG2 is a schematic diagram of random access time-frequency resources provided by some embodiments of the present disclosure;

[0018] FIG3 is a schematic diagram of a full-duplex mode provided by some embodiments of the present disclosure;

[0019] FIG4 is a schematic diagram of a guard interval provided by some embodiments of the present disclosure;

[0020] FIG5 is a flowchart of a random access method provided by some embodiments of the present disclosure;

[0021] FIG6 is a schematic diagram of a format of a random access signal provided by some embodiments of the present disclosure;

[0022] FIG7 is a schematic diagram of another format of a random access signal provided in some embodiments of the present disclosure;

[0023] FIG8 is a schematic diagram of another guard interval provided by some embodiments of the present disclosure;

[0024] FIG9 is a flowchart of another random access method provided by some embodiments of the present disclosure;

[0025] FIG10 is a schematic structural diagram of a random access device provided by some embodiments of the present disclosure;

[0026] FIG11 is a schematic structural diagram of another random access device provided in some embodiments of the present disclosure;

[0027] FIG12 is a schematic structural diagram of a communication device provided in some embodiments of the present disclosure. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions of this disclosure in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of this disclosure, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of this disclosure without making any creative efforts shall fall within the scope of protection of this disclosure.

[0029] It should be noted that in this disclosure, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this disclosure as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0030] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0031] In the description of this disclosure, unless otherwise specified, " / " means "or." For example, A / B can mean A or B. "And / or" in this document simply describes an association relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exists simultaneously, and B exists alone. Furthermore, "at least one" means one or more, and "a plurality" means two or more.

[0032] The methods provided in the embodiments of the present disclosure can be applied to various communication systems. For example, the communication system can be a fifth-generation (5G) communication system, a Wi-Fi system, a 3GPP-related communication system, a future-evolved communication system (such as a sixth-generation (6G) communication system), or a system that integrates multiple systems, and the embodiments of the present disclosure are not limited thereto.

[0033] The network architecture of the mobile communication network (including but not limited to 3G, 4G, 5G and future mobile communication networks) in the embodiments of the present disclosure may include at least a first communication node and a second communication node. It should be understood that in this example, when the two communication nodes are in device-to-device communication, the first communication node and the second communication node may both be network-side devices (e.g., including but not limited to base stations) or terminal-side devices (e.g., including but not limited to terminals). The first communication node and the second communication node may be referred to as the first node and the second node, respectively.

[0034] For example, taking the first node as a terminal and the second node as a base station, as shown in FIG1 , a communication system is provided in an embodiment of the present disclosure. The communication system includes a terminal 110 and a base station 120. There can be one or more terminals 110 and base stations 120, and the number is not limited.

[0035] First node terminal 110 is configured to transmit uplink signals and receive signals transmitted by base station 120. For example, in a full-duplex scenario, terminal 110 transmits a PRACH signal to base station 120 on time-frequency resources and receives downlink signals transmitted by base station 120 on the same time-frequency resources. Alternatively, terminal 110 performs downlink (DL) and uplink (UL) transmissions using time division multiplexing.

[0036] In some embodiments, the terminal may be a device with full-duplex transmission capability. The terminal may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. The embodiments of the present disclosure do not limit the application scenarios. The terminal may sometimes also be referred to as a user, user equipment (UE), access terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal, mobile device, UE terminal, wireless communication equipment, UE agent or UE device, etc., and the embodiments of the present disclosure do not limit this.

[0037] Base station 120 is configured to receive uplink signals sent by terminal 110 and send downlink signals to terminal 110. For example, in a full-duplex scenario, base station 120 receives PRACH signals sent by terminal 110 on time-frequency resources and sends downlink signals to terminal 110 on the same time-frequency resources.

[0038] It should be noted that the PRACH signal is used to support the establishment of a connection and uplink synchronization between the terminal 110 and the base station 120. Since the transmission of the PRACH signal determines whether the terminal 110 can normally access the communication system, it is crucial to ensure the success rate of the PRACH signal transmission.

[0039] For example, as shown in FIG2 , in one carrier, the base station 120 configures a set of RBs based on continuous resource blocks (RBs) in the frequency domain for full-duplex working mode (e.g., in-band full-duplex (IBFD) working mode). In this way, some time-frequency resources for IBFD operation can be obtained, which are recorded as resource A. Resource A is also called an IBFD subband and can be used for transmission of downlink signals and reception of uplink signals. At least on the base station 120 side, resource A can be used for simultaneous full-duplex transmission on the same frequency. That is, the base station 120 can use the same time and the same frequency to simultaneously send downlink signals and receive uplink signals in resource A. Among them, the symbol / time slot configured with resource A is called an IBFD symbol / slot, and the symbol / slot not configured with resource A is called a non-IBFD symbol / slot (e.g., a conventional downlink transmission symbol / slot, a conventional uplink transmission symbol / slot, or an F symbol / slot).

[0040] In some embodiments, the full-duplex operating mode also includes a subband full duplex (SBFD) mode. Symbols / time slots configured with resource A may also be referred to as SBFD symbols / slots, and symbols / slots not configured with resource A may be referred to as non-SBFD symbols / slots (e.g., conventional downlink transmission symbols / slots, conventional uplink transmission symbols / slots, or F symbols / slots).

[0041] In some embodiments, the base station can be a base station or an evolved base station (eNB or eNodeB) in long term evolution (LTE), long term evolution advanced (LTEA), a base station device in a 5G network, or a base station in a future communication system, etc. The base station can include various macro base stations, micro base stations, home base stations, wireless remote stations, reconfigurable intelligent surfaces (RISs), routers, relays, TRPs, wireless fidelity (WIFI) devices and other network side devices.

[0042] It should be noted that the above scenarios are intended to more clearly illustrate the technical solutions of the embodiments of the present disclosure and do not constitute a limitation on the technical solutions provided by the embodiments of the present disclosure. Ordinary technicians in this field can know that with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present disclosure are also applicable to similar technical problems.

[0043] In communication systems, as shown in Figure 3, full-duplex technology includes two modes: SBFD and IBFD. Full-duplex technology enables communication nodes to simultaneously transmit and receive on the same time-frequency resource. IBFD mode is a fully realized full-duplex communication mode. As shown in Figure 3, in this mode, the same time-frequency resource on which a communication node resides can be used for both uplink and downlink transmission, without distinguishing between uplink and downlink transmissions. SBFD mode is a subband-based full-duplex communication mode that divides the spectrum into specific subbands, and the uplink and downlink ratios can vary between different subbands. As shown in Figure 3, in SBFD mode, downlink transmission in the first subband occupies more time-frequency resources, while uplink transmission in the second subband occupies more time-frequency resources. In this mode, using different subbands, transmission and reception can occur simultaneously, meaning that transmit and receive signals can be transmitted simultaneously on the same spectrum resources.

[0044] Full-duplex technology specifies uplink and downlink subbands, which means that the uplink and downlink ratios between different subbands may differ. Symbols on some subbands are used for downlink transmission, but the same symbols on other subbands may be used for uplink transmission. These symbols are defined as full-duplex symbols. Some subbands on full-duplex symbols can be used for uplink transmission for full-duplex-capable devices, but for devices that do not have full-duplex capabilities, they can only use the original uplink time slots (that is, slots that can also be used by communication nodes that do not support full-duplex) for transmission. Uplink transmission includes the transmission of PRACH signals. PRACH signals are used to establish a connection between the UE and the network side (such as the base station) and perform uplink synchronization, which determines whether the UE can normally access the communication system. In full-duplex scenarios, full-duplex symbols plus the original uplink slots can extend the total uplink transmission time, thereby increasing available PRACH resources or enhancing the coverage of the PRACH signal.

[0045] However, to achieve full-duplex communication, the communication system requires strict isolation between transmit and receive to prevent its own transmitted signals from interfering with received signals. This isolation may involve hardware switching (such as antenna switching and filter switching) or switching between uplink and downlink. Therefore, as shown in Figure 4, when switching to full-duplex mode, a new general purpose (GP) may need to be introduced to ensure that delays during the switching process do not cause interference. When a new blank GP is introduced to facilitate the full-duplex mode switch, this GP effectively interrupts the previously continuous signal transmission process. For example, it interrupts the transmission of PRACH signals, which continuously use full-duplex symbols and the original uplink slot for long-format transmission. Since PRACH signals require continuous time resources to maintain sufficient signal strength and coverage, this GP may reduce PRACH coverage. Furthermore, since PRACH signal transmission determines whether the user equipment can access the communication system, ensuring the success rate of PRACH signal transmission is a high priority in full-duplex scenarios.

[0046] To address the above issues, see Figure 5, which is a flowchart of a random access method provided by an embodiment of the present disclosure. As shown in Figure 5, the random access method provided by an embodiment of the present disclosure is applied to a first node, including the following steps:

[0047] Step S101: Send a random access signal on a random access time-frequency resource.

[0048] The random access time-frequency resources include multiple symbols, and the multiple symbols include full-duplex symbols and non-full-duplex symbols.

[0049] The random access time-frequency resources include multiple symbols, and the multiple symbols include full-duplex symbols and non-full-duplex symbols.

[0050] In some embodiments, the full-duplex technology includes both IBFD and SBFD modes, so the full-duplex symbol can be an IBFD symbol or an SBFD symbol, and the non-full-duplex symbol can be a non-IBFD symbol or a non-SBFD symbol.

[0051] In some embodiments, the second node can configure an RB set based on consecutive RBs in the frequency domain for full-duplex scenarios. This can obtain a random access time-frequency resource, which is recorded as Resource B. Resource B can be used for both uplink and downlink signal transmission. That is, the first node can send a random access signal to the second node on Resource B, and at the same time, the second node can send a downlink signal to the first node on Resource B.

[0052] In some embodiments, the random access signal may be a PRACH signal. The PRACH signal is used to establish a connection between the first node and the second node and perform uplink synchronization, which determines whether the first node can normally access the communication system.

[0053] It can be understood that, based on the random access method provided in the embodiment of the present disclosure, the full-duplex symbol can enable the first node to perform bidirectional communication on the same time-frequency resource, thereby improving the response speed of the first node in sending a random access signal (such as a PRACH signal) on the random access time-frequency resource and the utilization efficiency of the communication system resources. The non-full-duplex symbol can ensure the stability of sending a random access signal on the random access time-frequency resource when the first node is at a long distance or in a complex environment. In summary, the random access resource includes multiple symbols, and the multiple symbols include full-duplex symbols and non-full-duplex symbols, which can enable the first node to aggregate and use full-duplex symbols and non-full-duplex symbols according to actual conditions when sending a random access signal (such as a PRACH signal) on the random access time-frequency resource, thereby minimizing the problem of interruption of continuous transmission of the random access signal due to the introduction of a new blank GP in the full-duplex working mode, improving the coverage capability of the random access signal, and thus ensuring the transmission of the random access signal in the full-duplex mode.

[0054] As a possible implementation manner, the above step S101 may be specifically implemented as: sending random access signals of the same format on random access time-frequency resources.

[0055] In some embodiments, the formats of the random access signal on the full-duplex symbol and the random access signal on the non-full-duplex symbol may be the same. For example, as shown in FIG6 , format B4 may be configured for the PRACH signal on the full-duplex symbol and the non-full-duplex symbol.

[0056] It is understood that sending a random access signal of the same format on random access time-frequency resources eliminates the need for the first node to support multiple random access signal formats, reducing its design and implementation complexity. A uniform random access signal format enables the second node to more effectively plan and allocate random access time-frequency resources, improving resource utilization efficiency. Furthermore, a uniform signal format helps the second node better identify and process the first node's random access request, thereby increasing the first node's access success rate.

[0057] As another possible implementation, step S101 may be specifically implemented as follows: sending random access signals of multiple formats on the random access time-frequency resource, wherein each format of the random access signal corresponds to at least one symbol in the random access time-frequency resource.

[0058] In some embodiments, the random access signals of multiple formats include at least a random access signal of a first format and a random access signal of a second format, and the random access signals of different formats are applicable to symbols in time slots of different types. For example, the random access signal of the first format is applicable to symbols in time slots of a first type, and the random access signal of the second format is applicable to symbols in time slots of a second type, and the usable length of time slots of the first type is smaller than the usable length of time slots of the second type.

[0059] For example, in a full-duplex scenario, when a blank GP needs to cut a portion of the original valid time slot on the random access time-frequency resource, the shorter time slot after the cut is the first type time slot. At this time, the available length of the first type time slot is smaller than the available length of the second type time slot, and it cannot support the same format as the second type time slot. Therefore, a first type of random access signal can be selected on the first type time slot to be suitable for the available length of the first type time slot. For example, as shown in Figure 7, the total length of the full-duplex symbol is 2.5 slots, of which slot 2, slot 3 and the original uplink slot 5 can use format B4, and the remaining half length of slot 4 after being cut by the blank GP can use format A3 to match its time slot length.

[0060] As shown in Figure 7, when full-duplex symbols are configured or activated, the frame structure determines the available uplink slots: slot 1, slot 2, slot 3, slot 5, and slot 6. Slot 4, due to being truncated by a blank GP, has additional time taken up. Therefore, slot 4 is defined as a truncated slot, an abnormal slot, a special slot, or a protection slot. Accordingly, slots 1, 2, 3, 5, and 6 are defined as normal slots. Slots 1, 5, and 6 are all existing uplink slots.

[0061] It will be appreciated that the methods provided in the embodiments of the present disclosure, by transmitting random access signals of multiple formats on random access time-frequency resources, can adapt to the available time slot lengths of different time slots on the random access time-frequency resources, thereby reducing the impact of blank GPs truncating a time slot on random access signal transmission. The first node can aggregate random access signals based on the different formats to ensure the duration and stability of random access signal transmission, thereby improving the coverage capability of the random access signal.

[0062] In some embodiments, even if the formats of random access signals on random access time-frequency resources are different, the difference in cyclic prefix (CP) lengths of the random access signals of multiple formats is within a preset range. That is, the difference in CP lengths between different formats should be kept as small as possible. Exemplarily, the preset range may be that the difference in CP lengths between different formats is less than 10%.

[0063] For example, the random access time-frequency resources include two different formats of random access signals, format B4 and format A3. The CP length of format B4 is 936 samples, and the CP length of format A3 is 864 samples. The difference is less than 10% of the cyclic prefix length, and has little impact on the coverage capability of the random access signal.

[0064] It's understandable that CP can help reduce subcarrier-to-subcarrier and symbol-to-symbol interference. Keeping the CP lengths of random access signals relatively small makes it easier to partition and adjust random access signal resources, improving random access resource utilization. Furthermore, in wireless communication systems, signals are typically transmitted according to a specific frame structure. If the CP lengths of random access signals of different formats vary within a preset range, the uniformity of the communication system's frame structure can be maintained, facilitating network synchronization.

[0065] In some embodiments, the above format may be an existing format or a new format.

[0066] As an example, since the number of full-duplex symbols is large and may span multiple time slots, the existing long format across time slots can be utilized as much as possible, such as format 2 defined in the communication system (this format has a bandwidth of 15KHz for the time slot subcarrier) or format 0, format 1, format 3, etc. (this type of format has a bandwidth of 30KHz for the time slot subcarrier).

[0067] As another example, a new format can be designed for random access signals (such as PRACH signals) transmitted across multiple time slots. For example, when the subcarrier bandwidth is 15 kHz, the total length of a full-duplex symbol is approximately between 2.5 ms and 3 ms. In this case, no existing PRACH format can fit this length, so a new PRACH format can be considered. For example, the new PRACH format can contain three consecutive PRACH sequences (a total length of 839 points).

[0068] Figure 7 illustrates the extraction of a blank GP from the slot containing a full-duplex symbol. Considering that a blank GP may also be extracted from the first slot of an existing uplink slot, the format of the random access signal within different slots may vary after random access signal segmentation. For example, as shown in Figure 8, since the blank GP is extracted from the first slot of an existing uplink slot, the first slot of the existing uplink slot is truncated and can only support shorter random access signal formats, such as format A3. However, all time slots containing full-duplex symbols can support longer formats, such as format B4.

[0069] It is understandable that the format of the random access signal used in the original uplink slot often needs to consider backward compatibility, while the format of the random access signal used in the slot containing full-duplex symbols is more flexible. Therefore, regardless of whether the blank GP is extracted from the slot containing full-duplex symbols or from the original uplink slot, the format of the random access signal used in the slot containing full-duplex symbols can be different from the format of the random access signal used in the time slot containing non-full-duplex symbols.

[0070] In some embodiments, when the formats of the random access signals sent on the random access time-frequency resources are different, the above method further includes: receiving first signaling.

[0071] The first signaling is used to indicate an index corresponding to each of the multiple formats and a time domain position of a symbol used by each of the multiple formats.

[0072] For example, taking the random access signal as a PRACH signal, the format of the PRACH signal is generally not directly configured, but the second node specifies a PRACH configuration index in the PRACH time domain resource table, thereby indirectly obtaining the PRACH format. After receiving the first signaling, the first node determines the format of the PRACH signal from the PRACH time domain resource table based on the index corresponding to each of the multiple formats indicated by the first signaling, and determines the format of the PRACH signal on each symbol based on the time domain position of the symbol used by each of the multiple formats.

[0073] The PRACH time domain resource table is shown in Table 1 below. Based on the PRACH time domain resource table, the format of the PRACH signal can be determined according to the index corresponding to each format.

[0074] Table 1

[0075] When the function of PRACH aggregation of different PRACH formats is introduced for the first node, the configuration of the corresponding PRACH format can still consider using different indexes in the PRACH time domain resource table to jointly determine the PRACH format used during PRACH aggregation. For example, if the PRACH configuration index indicated by the first signaling is 165 and 217, then as shown in Table 1 above, the corresponding PRACH formats are A3 and B4 respectively. In addition to indicating the index corresponding to each format, the first signaling is also used to indicate the time domain position of the symbol used by each format. For example, the first signaling indicates that index 165 corresponds to a truncated slot and 217 corresponds to a normal slot.

[0076] In some embodiments, the first signaling may also only configure the index corresponding to the normal slot and directly specify the PRACH format for the truncated slot.

[0077] It should be noted that although the formats of PRACH aggregation are different, the root sequence used and the sequence number used within the root sequence can still be the same, and this is not limited in the embodiments of the present disclosure.

[0078] It is understandable that by receiving the first signaling, the first node can learn which random access signal formats the second node (i.e., the network side) supports and the time domain positions of the symbols used in each format, so that the first node can send the random access signal at the correct time, avoid conflicts with the transmission of other signals, and improve the success rate of the random access process. At the same time, based on the instruction of the first signaling, the first node sends the random access signal at a specific time domain position, which helps to allocate and use the random access time and frequency resources and avoid waste of resources.

[0079] It should be noted that when configuring the format of the random access signal, the same format is typically configured for the random access signal for the same communication node. However, for communication nodes supporting full-duplex, since they can support the aggregation of random access signals of different formats during random access signal transmission, the signaling design may be reconsidered when the second node configures the corresponding random access signal format. This is not limited in the embodiments of the present disclosure.

[0080] In some embodiments, the method further includes receiving a second signaling message, wherein the second signaling message indicates the position and length of the guard period. Upon receiving the second signaling message, the first node may determine which symbols in the truncated slot may be used to transmit the random access signal based on the position and length of the GP indicated in the second signaling message.

[0081] It should be noted that the appearance of a blank GP causes the interruption of continuous uplink transmission. However, if the second node does not define and notify the first node of the location and length of the blank GP, the first node cannot determine which symbols in the truncated slot can be used to send a random access signal. In the case of unknown specific location and length of the GP, the truncated time slot where the GP is located cannot be used to transmit a random access signal and can be defined as an invalid random access opportunity (RACH occasion, RO). If the symbols in the truncated slot need to be used for the transmission of a random access signal, it is very important for the second node to configure the location and length of the GP.

[0082] It will be appreciated that in the method provided in the embodiments of the present disclosure, upon receiving the second signaling, the first node can determine which symbols in the truncated slot can be used to transmit the random access signal based on the position and length of the GP indicated in the second signaling. This allows the first node to maximize the utilization of resources in the truncated slot and avoid resource waste. Furthermore, based on the position and length of the GP, the first node can select the optimal transmission timing when transmitting the random access signal, thereby improving the transmission efficiency of the random access signal and increasing the success rate of the first node's random access request.

[0083] In some embodiments, the second node may further configure the length of the truncated time slot, the position and length of the DL symbol within the truncated time slot, the position and length of the uplink symbol, etc. to indirectly configure the position and length of the GP.

[0084] It is understandable that, in addition to directly configuring the position and length of the GP, the second node may also indirectly indicate the position and length of the GP to the first node in other ways, thereby improving the flexibility of the communication system.

[0085] In some embodiments, the timing advance of the random access signal transmitted on the full-duplex symbol is different from the timing advance of the random access signal transmitted on the non-full-duplex symbol. The random access signal that is aggregated and transmitted in segments may have different timing advances in each segment because it is separated by a blank GP. For example, the random access signal transmitted on the original uplink slot may follow the conventional timing advance, for example, the timing advance may include the common numerology time alignment offset (NTAoffset). However, the timing advance of the random access signal transmitted on the full-duplex symbol may be different from that on the original uplink slot, for example, its timing advance may be set to 0. If a blank GP is also reserved in the downlink slot before the first slot where the full-duplex symbol is located, the timing advance of the random access signal transmitted on the full-duplex symbol may also be greater than 0.

[0086] In some embodiments, the power configuration of the random access signal transmitted on the full-duplex symbol is different from the power configuration of the random access signal transmitted on the non-full-duplex symbol. The power configuration of the random access signal transmitted on the full-duplex symbol includes a power deviation. When the first node transmits the random access signal in the slot where the full-duplex symbol is located and in the slot where the non-full-duplex symbol is located, and performs aggregation, on the basis of the conventional power control of the random access signal, it can be considered to configure an independent power deviation for the random access signal transmitted in the slot where the full-duplex symbol is located to resist the huge interference of the downlink transmission on the uplink transmission in the full-duplex mode. Exemplarily, this power deviation can be greater than or equal to 0dB, but in some scenarios, the power deviation can also be configured to be less than 0dB, which is not limited in this disclosure.

[0087] It should be noted that the above disclosed embodiments focus on the fact that random access signals can only be transmitted in segments due to the presence of blank GPs. However, under certain conditions, random access signals can be transmitted across blank GPs, that is, across both full-duplex and non-full-duplex symbols. For example, if phase continuity conditions are met, random access signals can be transmitted across blank GPs.

[0088] It can be understood that the method provided in the embodiment of the present disclosure configures a conventional random access signal format with backward compatibility on the original uplink slot, so that regardless of whether the first node has full-duplex capability, it can use this format to send a random access signal.

[0089] In some embodiments, the random access configuration table is used to indicate time-frequency resources used by the first node to transmit a random access signal. In the random access configuration table, each RO corresponds to a specific time-frequency resource for the first node to use when transmitting the random access signal. The random access time-frequency resource includes the time-frequency resource corresponding to at least one RO in the random access configuration table.

[0090] In some embodiments, all ROs in the random access configuration table are valid ROs. Even ROs that fall on downlink symbols are considered valid ROs, and the corresponding symbols are defined as full-duplex symbols. In this case, the total resources occupied by the frequency-domain multiplexed ROs correspond to the bandwidth of the uplink subband, and the first node can perform uplink and downlink transmissions on the same frequency-domain resources.

[0091] It is understandable that in a mobile communication system, the downlink signal power on the second node (such as a base station) side is usually stronger. This is because the base station needs to cover a larger geographical area to ensure that the first node (such as a UE) can receive a stable signal. The base station has a relatively large transmit power and a more efficient antenna system, which enables it to send high-power downlink signals to a wide area. In contrast, due to the limited transmit power of the UE, the power of the uplink signal (such as a PRACH signal) sent by it to the base station is usually weak. Since the downlink signal strength sent by the base station is large, if the base station's reception frequency for the uplink signal is too close to the transmission frequency of the downlink signal, or there is overlap in spatial distribution, interference caused by the downlink signal to the uplink reception may occur (for example, in a fully full-duplex mode, the downlink transmission of the downlink sub-band causes adjacent-band interference to the uplink reception of the adjacent band). This interference may cause the base station to have a poor signal-to-noise ratio when receiving the uplink signal from the terminal, thereby affecting the communication quality and reliability. The method provided by the embodiment of the present disclosure, by defining all ROs in the random access configuration table as valid ROs, can enable the first node to randomly record the absence of other downlink signals or channel transmissions on the random access time-frequency resources when sending a random access signal on the random access time-frequency resources.

[0092] It should be noted that for the SBFD mode, although the second node still needs to solve the problem of overall transmission and reception, that is, to solve the self-interference problem of its own transmission and reception. However, from the perspective of the first node (such as UE), there is no self-interference problem of its own transmission and reception. In addition, from the second node side, it is a full-duplex transmission and reception mode as a whole, but specifically within a certain sub-band and a certain symbol, the signal transmission is still non-full-duplex. The self-interference problem of the full-duplex solution of the SBFD mode mainly exists in the adjacent-band interference caused by the downlink transmission of the downlink sub-band to the uplink reception of the adjacent band, that is, the full-duplex solution based on the SBFD mode reduces the difficulty of solving the self-interference problem.

[0093] In some embodiments, a full-duplex symbol may be defined first, and then all ROs within the full-duplex symbol may be defined as valid ROs.

[0094] It is understandable that in a full-duplex scenario, if the first node uses the random access time-frequency resource to transmit a random access signal, and the second node also sends a downlink signal on the same random access time-frequency resource, and the power of the downlink signal on the antenna port of the second node is relatively strong, while the random access signal received in the uplink is very weak, the downlink transmission causes strong interference to the uplink reception, and therefore an additional self-interference elimination technology is required to eliminate self-interference. The method provided in the embodiment of the present disclosure, by first defining the full-duplex symbol, can be combined with the consideration of the frame structure to prioritize more important downlink signals, without defining these important downlink signals as full-duplex symbols, thereby ensuring normal communication. In addition, by defining the full-duplex symbol and defining all ROs falling within the full-duplex symbol as valid ROs, the ROs for transmitting the random access signal can be supplemented, thereby improving the transmission efficiency and transmission quality of the random access signal with higher priority, and avoiding the significant interference of the downlink transmission on the random access signal in the full-duplex scenario.

[0095] In some embodiments, in a full-duplex scenario, the problem of insufficient TDD uplink random access resources and insufficient coverage, which was originally limited by the smaller number of TDD uplink time slots under the time division duplexing (TDD) frame structure, is solved. Full-duplex in the full sense allows the UE to organize random access signals at any time starting point and time length, thereby expanding the coverage range and overall resources of random access. For example, originally only PRACH short formats A, B, and C could be used, but now PRACH long formats with a length of 1ms and a maximum of 3.5ms can be added. However, due to the severe self-interference of the full-duplex mode on the uplink and the actual need to give priority to PRACH reception, full-duplex in the full sense is not very suitable for PRACH transmission, and the sub-band-based SBFD mode is more suitable for enhancing PRACH. This can be regarded as a degradation or simplification of the full-duplex function. A time-frequency resource can be opened up specifically for PRACH, and there is no need for the base station to transmit downlink signals or services at the same frequency when receiving PRACH. Or in the IBFD scenario, even when receiving PRACH, some downlink signals or services can be transmitted, but important downlink signals SSB and important uplink signals PRACH should avoid each other. Predefined priorities can be considered, or the transmission of SSB or PRACH in a certain direction can be directly prohibited.

[0096] In some embodiments, if downlink subbands are configured within uplink slots, the number of SSBs is the primary factor affecting TDD coverage. Therefore, the resources of control resource set 0 (CORESET0) corresponding to all SBBs falling within uplink slots can be defined as downlink subbands.

[0097] It should be noted that, in addition to the uplink sub-band and downlink sub-band defined above, other frequency domain resources can be configured according to a conventional frame structure or a frame structure suitable for full-duplex, which is not limited in the embodiments of the present disclosure.

[0098] Refer to Figure 9, which is a flowchart of another random access method provided by an embodiment of the present disclosure. As shown in Figure 9, the random access method provided by an embodiment of the present disclosure is applied to the second node and can be specifically implemented as follows:

[0099] Step S201: Detect a random access signal on a random access time-frequency resource.

[0100] The random access time-frequency resources include multiple symbols, and the multiple symbols include full-duplex symbols and non-full-duplex symbols.

[0101] As an example, the random access signals transmitted on the random access time-frequency resources are random access signals of the same format.

[0102] As another example, the random access signal transmitted on the random access time-frequency resource includes random access signals in multiple formats, and each format of the random access signal corresponds to at least one symbol in the random access time-frequency resource.

[0103] It can be understood that, based on the random access method provided in the embodiment of the present disclosure, the full-duplex symbol can enable the first node to perform bidirectional communication on the same time-frequency resource, thereby improving the response speed of the first node in sending a random access signal (e.g., a PRACH signal) on the random access time-frequency resource and the utilization efficiency of the communication system resources. The non-full-duplex symbol can ensure the stability of sending a random access signal on the random access time-frequency resource when the first node is at a long distance or in a complex environment. In summary, the random access resource includes multiple symbols, and the multiple symbols include full-duplex symbols and non-full-duplex symbols, so that when the second node detects a random access signal (e.g., a PRACH signal) on the random access time-frequency resource, the random access signal can aggregate full-duplex symbols and non-full-duplex symbols for transmission, thereby minimizing the problem of interruption of continuous transmission of the PRACH signal due to the introduction of a new blank GP in the full-duplex working mode, improving the coverage capability of the PRACH signal, and thereby ensuring the transmission of the random access signal in the full-duplex mode.

[0104] In some embodiments, the above method further includes: sending a first signaling, the first signaling being used to indicate an index of each format in a plurality of formats, and a symbol corresponding to each format in a plurality of formats. Exemplarily, taking the random access signal as an example, the format of the PRACH signal is usually not directly configured, but the second node specifies the PRACH configuration index in the PRACH time domain resource table, thereby indirectly obtaining the PRACH format. After receiving the first signaling, the first node determines the format of the PRACH signal from the PRACH time domain resource table based on the index corresponding to each format in the plurality of formats indicated by the first signaling, and determines the format of the PRACH signal on each symbol based on the time domain position of the symbol used by each format in the plurality of formats.

[0105] It is understood that by sending the first signaling, the second node can inform the first node which random access signal formats the second node supports and the time domain positions of the symbols used in each format, so that the first node can send the random access signal at the correct time, avoid conflicts with the transmission of other signals, and improve the success rate of the random access process. At the same time, based on the instruction of the first signaling, the first node can send the random access signal at a specific time domain position, which facilitates the allocation and use of random access time and frequency resources and avoids resource waste.

[0106] In some embodiments, the above method further includes: sending a second signaling, where the second signaling is used to indicate the position and length of the protection time.

[0107] In some embodiments, the presence of a blank GP causes the interruption of continuous uplink transmission. However, if the second node does not define and notify the first node of the location and length of the blank GP, the first node cannot determine which symbols in the truncated slot can be used to transmit a random access signal. Without knowing the specific location and length of the GP, the truncated slot containing the GP cannot be used to transmit a random access signal and is defined as an invalid RO. If symbols in a truncated slot are required for random access signal transmission, it is important for the second node to configure the location and length of the GP.

[0108] In some embodiments, the second node may further configure the length of the truncated time slot, the position and length of the DL symbol within the truncated time slot, the position and length of the uplink symbol, etc. to indirectly configure the position and length of the GP.

[0109] It is understood that by sending the second signaling, the second node can enable the first node, upon receiving the second signaling, to determine which symbols in the truncated slot can be used to send the random access signal based on the position and length of the GP indicated in the second signaling. This allows the first node to maximize the utilization of resources in the truncated slot and avoid resource waste. Furthermore, based on the position and length of the GP, the first node can select the optimal transmission timing when sending the random access signal, thereby improving the transmission efficiency of the random access signal and increasing the success rate of the first node's random access request.

[0110] The above mainly introduces the solution of the embodiment of the present disclosure from the perspective of method. It can be understood that in order to realize the above functions, the random access device includes at least one of the hardware structure and software modules corresponding to the execution of each function. It should be easy for those skilled in the art to realize that, in combination with the units and algorithm steps of each example described in the embodiment disclosed herein, the embodiment of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a computer software-driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the embodiment of the present disclosure.

[0111] It is understandable that, in order to implement the above functions, the random access device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily appreciate that, in conjunction with the algorithmic steps of the various examples described in the embodiments of the present disclosure, the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a manner driven by computer software depends on the specific application and design constraints of the technical solution. Professional and technical personnel may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present disclosure.

[0112] The embodiments of the present disclosure can divide the random access device into functional modules based on the above-mentioned method embodiments. For example, each functional module can be divided into corresponding modules for each function, or two or more functions can be integrated into a single functional module. The above-mentioned integrated modules can be implemented in either hardware or software. It should be noted that the module division in the embodiments of the present disclosure is illustrative and only represents a logical functional division. In actual implementation, other division methods may be used. The following description uses the example of dividing each functional module into corresponding modules for each function.

[0113] Figure 10 is a schematic diagram of the structure of a random access device provided by an embodiment of the present disclosure. The random access device is applied to a first node and can execute the random access method provided by the above method embodiment. As shown in Figure 10, the random access device 200 includes: a sending module 201 and a receiving module 202.

[0114] The sending module 201 is configured to send a random access signal on a random access time-frequency resource, where the random access time-frequency resource includes a plurality of symbols, and the plurality of symbols include a full-duplex symbol and a non-full-duplex symbol.

[0115] In some embodiments, the sending module 201 is specifically configured to send random access signals of the same format on random access time-frequency resources.

[0116] In some embodiments, the sending module 201 is specifically configured to send random access signals of multiple formats on the random access time-frequency resources, where each format of the random access signal corresponds to at least one symbol in the random access time-frequency resources.

[0117] In some embodiments, the random access signals of multiple formats include at least a random access signal of a first format and a random access signal of a second format, the random access signal of the first format is applicable to symbols in a first type of time slot, the random access signal of the second format is applicable to symbols in a second type of time slot, and the usable length of the first type of time slot is less than the usable length of the second type of time slot.

[0118] In some embodiments, the difference in cyclic prefix lengths of random access signals of multiple formats is within a preset range.

[0119] In some embodiments, the receiving module 202 is configured to receive first signaling, where the first signaling is used to indicate an index corresponding to each of a plurality of formats and a time domain position of a symbol used by each of the plurality of formats.

[0120] In some embodiments, the format is an existing format or a new format.

[0121] In some embodiments, the receiving module 202 is further configured to receive a second signaling, where the second signaling is configured to indicate the position and length of the guard time.

[0122] In some embodiments, the timing advance of a random access signal transmitted in a full-duplex symbol is different from the timing advance of a random access signal transmitted in a non-full-duplex symbol.

[0123] In some embodiments, the power configuration of the random access signal transmitted in the full-duplex symbol is different from the power configuration of the random access signal transmitted in the non-full-duplex symbol.

[0124] In some embodiments, the power configuration of the random access signal transmitted on the full-duplex symbol includes a power offset.

[0125] In some embodiments, the random access time-frequency resources include time-frequency resources corresponding to at least one random access opportunity in the random access configuration table.

[0126] In some embodiments, all random access opportunities in the random access configuration table are valid random access opportunities.

[0127] Figure 11 is a schematic diagram of the structure of a random access device provided by an embodiment of the present disclosure. The random access device is applied to a second node and can execute the random access method provided by the above method embodiment. As shown in Figure 11, the random access device 300 includes: a detection module 301 and a sending module 302.

[0128] The detection module 301 is configured to detect a random access signal on a random access time-frequency resource, where the random access time-frequency resource includes a plurality of symbols, and the plurality of symbols include a full-duplex symbol and a non-full-duplex symbol.

[0129] In some embodiments, the random access signals transmitted on the random access time-frequency resources are random access signals of the same format.

[0130] In some embodiments, the random access signal transmitted on the random access time-frequency resource includes random access signals in multiple formats, and each format of the random access signal corresponds to at least one symbol in the random access time-frequency resource.

[0131] In some embodiments, the random access signals of multiple formats include at least a random access signal of a first format and a random access signal of a second format, the random access signal of the first format is applicable to symbols in a first type of time slot, the random access signal of the second format is applicable to symbols in a second type of time slot, and the length of the first type of time slot is less than the length of the second type of time slot.

[0132] In some embodiments, the difference in cyclic prefix lengths of random access signals of multiple formats is within a preset range.

[0133] In some embodiments, the sending module 302 is configured to send a first signaling, where the first signaling is used to indicate an index of each format in a plurality of formats and a symbol corresponding to each format in the plurality of formats.

[0134] In some embodiments, the format is an existing format or a new format.

[0135] In some embodiments, the sending module 302 is further configured to send a second signaling, where the second signaling is configured to indicate the position and length of the guard time.

[0136] In some embodiments, the timing advance of a random access signal transmitted in a full-duplex symbol is different from the timing advance of a random access signal transmitted in a non-full-duplex symbol.

[0137] In some embodiments, the power configuration of the random access signal transmitted in the full-duplex symbol is different from the power configuration of the random access signal transmitted in the non-full-duplex symbol.

[0138] In some embodiments, the power configuration of the random access signal transmitted on the full-duplex symbol includes a power offset.

[0139] In some embodiments, the random access time-frequency resources include time-frequency resources corresponding to at least one random access opportunity in the random access configuration table.

[0140] In some embodiments, all random access opportunities in the random access configuration table are valid random access opportunities.

[0141] In the case of implementing the functions of the above-mentioned integrated modules in hardware, the embodiments of the present disclosure provide a possible structure of the communication device involved in the above-mentioned embodiments. As shown in Figure 12, the communication device 400 includes: a processor 402 and a bus 404. Optionally, the communication device 400 may also include a memory 401; optionally, the communication device 400 may also include a communication interface 403.

[0142] Processor 402 may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of this disclosure. Processor 402 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array, or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of this disclosure. Processor 402 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, or a combination of a DSP and a microprocessor.

[0143] The communication interface 403 is used to connect to other devices via a communication network, such as Ethernet, wireless access network, wireless local area network (WLAN), etc.

[0144] The memory 401 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0145] As a possible implementation, memory 401 may exist independently of processor 402. Memory 401 may be connected to processor 402 via bus 404 to store instructions or program codes. When processor 402 calls and executes the instructions or program codes stored in memory 401, the random access method provided in the embodiments of the present disclosure can be implemented.

[0146] In another possible implementation, the memory 401 may also be integrated with the processor 402 .

[0147] Bus 404 can be an Extended Industry Standard Architecture (EISA) bus, etc. Bus 404 can be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, FIG12 shows only one thick line, but this does not mean that there is only one bus or only one type of bus.

[0148] Some embodiments of the present disclosure provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium), which stores computer program instructions. When the computer program instructions are executed on a computer, the computer executes the random access method of any of the above embodiments.

[0149] Exemplarily, the above-mentioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes, etc.), optical disks (e.g., compact disks (CDs), digital versatile disks (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memories (EPROMs), cards, sticks, or key drives, etc.). The various computer-readable storage media described in the present disclosure may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0150] An embodiment of the present disclosure provides a computer program product comprising instructions. When the computer program product is run on a computer, the computer is enabled to perform the random access method of any one of the above embodiments.

[0151] The above are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or replacements within the technical scope disclosed in the present disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A random access method, wherein: Applied to the first node, the method comprises: A random access signal is sent on a random access time-frequency resource, where the random access time-frequency resource includes a plurality of symbols, and the plurality of symbols include a full-duplex symbol and a non-full-duplex symbol.

2. The method according to claim 1, wherein: The sending of a random access signal on a random access time-frequency resource includes: A random access signal in the same format is sent on the random access time-frequency resources.

3. The method according to claim 1, wherein: The sending of a random access signal on a random access time-frequency resource includes: A plurality of formats of random access signals are sent on the random access time-frequency resources, and each format of the random access signal corresponds to at least one symbol in the random access time-frequency resources.

4. The method according to claim 3, wherein: The random access signals of multiple formats include at least a random access signal of a first format and a random access signal of a second format, the random access signal of the first format is applicable to symbols in a first type of time slot, the random access signal of the second format is applicable to symbols in a second type of time slot, and an available length of the first type of time slot is smaller than an available length of the second type of time slot.

5. The method according to claim 3, wherein: The difference in the length of the cyclic prefixes of the random access signals of the multiple formats is within a preset range.

6. The method according to claim 3, wherein: The method further comprises: A first signaling is received, where the first signaling is used to indicate an index corresponding to each of the multiple formats and a time domain position of a symbol used by each of the multiple formats.

7. The method according to claim 2 or 3, wherein: The format is an existing format or a new format.

8. The method according to claim 1, wherein: The method further comprises: A second signaling is received, where the second signaling is used to indicate a position and a length of a guard time.

9. The method according to claim 1, wherein: The timing advance of the random access signal transmitted in the full-duplex symbol is different from the timing advance of the random access signal transmitted in the non-full-duplex symbol.

10. The method according to claim 1, wherein: The power configuration of the random access signal transmitted in the full-duplex symbol is different from the power configuration of the random access signal transmitted in the non-full-duplex symbol.

11. The method according to claim 10, wherein: The power configuration of the random access signal transmitted on the full-duplex symbol includes a power deviation.

12. The method according to claim 1, wherein: The random access time-frequency resources include time-frequency resources corresponding to at least one random access opportunity in the random access configuration table.

13. The method according to claim 12, wherein: All random access opportunities in the random access configuration table are valid random access opportunities.

14. A random access method, wherein: Applied to the second node, the method comprises: A random access signal is detected on a random access time-frequency resource, where the random access time-frequency resource includes a plurality of symbols, and the plurality of symbols include a full-duplex symbol and a non-full-duplex symbol.

15. The method according to claim 14, wherein: The random access signals transmitted on the random access time-frequency resources are random access signals in the same format.

16. The method according to claim 14, wherein: The random access signal transmitted on the random access time-frequency resource includes random access signals in multiple formats, and each format of the random access signal corresponds to at least one symbol in the random access time-frequency resource.

17. The method according to claim 16, wherein: The random access signals of multiple formats include at least a random access signal of a first format and a random access signal of a second format, the random access signal of the first format is applicable to symbols in a first type of time slot, the random access signal of the second format is applicable to symbols in a second type of time slot, and the length of the first type of time slot is less than the length of the second type of time slot.

18. The method according to claim 16, wherein: The difference in the length of the cyclic prefixes of the random access signals of the multiple formats is within a preset range.

19. The method according to claim 16, wherein: The method further comprises: A first signaling is sent, where the first signaling is used to indicate an index of each of the multiple formats and a symbol corresponding to each of the multiple formats.

20. The method according to claim 15 or 16, wherein: The format is an existing format or a new format.

21. The method according to claim 14, wherein: The method further comprises: A second signaling is sent, where the second signaling is used to indicate the position and length of the protection time.

22. The method according to claim 14, wherein: The timing advance of the random access signal transmitted in the full-duplex symbol is different from the timing advance of the random access signal transmitted in the non-full-duplex symbol.

23. The method according to claim 14, wherein: The power configuration of the random access signal transmitted in the full-duplex symbol is different from the power configuration of the random access signal transmitted in the non-full-duplex symbol.

24. The method according to claim 23, wherein: The power configuration of the random access signal transmitted on the full-duplex symbol includes a power deviation.

25. The method of claim 14, wherein: The random access time-frequency resources include time-frequency resources corresponding to at least one random access opportunity in the random access configuration table.

26. The method according to claim 25, wherein: All random access opportunities in the random access configuration table are valid random access opportunities.

27. A communication device, wherein: include: a processor and a memory for storing instructions executable by the processor; The processor is configured to execute the instructions so that the communication device performs the method as claimed in any one of claims 1 to 26.

28. A computer-readable storage medium, wherein: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a computer, the computer is caused to perform the method according to any one of claims 1 to 26.

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