Random access method, device, terminal and readable storage medium

Abstract

The present application discloses a random access method, apparatus, terminal and readable storage medium, belonging to the field of communication technologies. The method includes: selecting a target RACH resource associated with a first reference signal and / or a second reference signal; initiating random access using the target RACH resource; wherein the first reference signal is a reference signal unique to the SFN, and the second reference signal is a reference signal unique to a cell or a transmission reception point cell / TRP. In the embodiments of the present application, initiating random access using a RACH resource associated with a reference signal unique to the SFN and / or a reference signal unique to a cell / TRP can achieve fast RACH access and effectively save the power consumption of the terminal.

Description

Technical Field

[0001] This application belongs to the field of communication technologies, and particularly relates to a random access method, apparatus, terminal, and readable storage medium. Background Art

[0002] As the frequency bands deployed in future communication systems become higher and higher, the coverage range of a cell or a transmission reception point (TRP) becomes smaller and smaller. At the same time, the application scenarios supported by future mobile communication systems are becoming more and more diverse, including more high-speed scenarios. This brings about frequent mobility (including handover in the connected mode and cell selection / reselection in the idle or inactive mode). As a result, more terminal measurements are introduced, which increases the power consumption of the terminal.

[0003] To reduce the power consumption of the terminal, cell-free or single-frequency network (SFN) will be introduced. Currently, there is a lack of a random access method for this scenario. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a random access method, apparatus, terminal, and readable storage medium, which can solve the problem of how to perform random access after introducing SFN.

[0005] To solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, a random access method is provided, which is applied to a terminal. The method is characterized in that it includes:

[0007] Select a target random access channel (RACH) resource associated with a first reference signal and / or a second reference signal;

[0008] Initiate random access using the target RACH resource;

[0009] Wherein, the first reference signal is a reference signal unique to a single-frequency network (SFN), and the second reference signal is a reference signal unique to a cell or a transmission reception point (cell / TRP).

[0010] In a second aspect, a random access apparatus is provided, which is applied to a terminal. The apparatus is characterized in that it includes:

[0011] A selection module, configured to select a target random access channel (RACH) resource associated with a first reference signal and / or a second reference signal;

[0012] An access module, configured to initiate random access using the target RACH resource;

[0013] Wherein, the first reference signal is a reference signal unique to a single-frequency network (SFN), and the second reference signal is a reference signal unique to a cell or a transmission and reception point (cell / TRP).

[0014] In a third aspect, a terminal is provided, which includes a processor, a memory, and a program or instruction stored on the memory and executable on the processor. When the program or instruction is executed by the processor, the steps of the random access method described in the first aspect are implemented.

[0015] In a fourth aspect, a readable storage medium is provided, which stores a program or instruction. When the program or instruction is executed by a processor, the steps of the random access method described in the first aspect are implemented.

[0016] In a fifth aspect, a chip is provided. The chip includes a processor and a communication interface, and the communication interface is coupled to the processor. The processor is configured to run a network-side device program or instruction to implement the steps of the random access method described in the first aspect.

[0017] In the embodiments of the present application, initiating random access using a RACH resource associated with a reference signal unique to an SFN and / or a reference signal unique to a cell / TRP can achieve fast RACH access and effectively save the power consumption of the terminal. Description of the Drawings

[0018] FIG. 1 is a schematic diagram of an SFN architecture;

[0019] Figure 1b is a schematic diagram of a dense network architecture;

[0020] Figure 1c is a schematic diagram of a contention-based random access process;

[0021] Figure 1d is a schematic diagram of a non-contention-based random access process;

[0022] Figure 2 is a schematic diagram of the random access method provided by the embodiments of the present application;

[0023] Figure 3 is a schematic diagram of the structure of the random access device provided by the embodiments of the present application;

[0024] Figure 4 is a schematic diagram of the terminal structure provided by the embodiments of the present application Detailed Embodiments

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part rather than all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0026] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances 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 the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0027] 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, and can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used in the above-mentioned systems and radio technologies, as well as in other systems and radio technologies. However, the following description describes the New Radio (NR) system for example purposes, and the NR term is used in most of the following descriptions, although these technologies can also be applied to applications other than NR system applications, such as the 6th Generation (6G) communication system.

[0028] In the embodiments of the present application, the terminal may also be referred to as a terminal device or a user equipment (UE). The terminal may be a mobile phone, a tablet personal computer, a laptop computer or a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (MID), a wearable device or a vehicle-mounted device (VUE), a pedestrian terminal (PUE), etc. on the terminal side. The wearable devices include: smart bracelets, earphones, glasses, etc. It should be noted that the specific type of the terminal is not limited in the embodiments of the present application. The network side may be a base station. Among them, the base station may be referred to as Node B, evolved Node B, access point, base transceiver station (BTS), radio base station, radio transceiver, basic service set (BSS), extended service set (ESS), Node B, evolved Node B (eNB), home Node B, home evolved Node B, WLAN access point, WiFi node, transmitting receiving point (TRP), or some other suitable term in the art. As long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiments of the present application, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

[0029] To better understand the solution provided by the present application, the following content is first described:

[0030] Introduction to Single-Frequency Network (SFN):

[0031] SFN Transmission Scheme: Multiple cells or multiple transmission points send the same signal. There is no co-channel interference between different cells, and multiple signals can improve the Signal to Interference plus Noise Ratio (SINR), transmission quality, and coverage effect. Multiple cells that make up an SFN can share a cell ID, that is, the ID of a super cell. Multiple cells can send signals in the SFN transmission mode. For example, each cell sends a wide beam. At a certain moment, the terminal can receive wide beams sent by multiple cells, thus obtaining diversity gain. In the SFN transmission scheme, the terminal does not need to frequently perform cell reselection or handover between cells.

[0032] Participate Figure 1a , the figure shows an SFN super cell composed of 7 cells.

[0033] IDLE or INACTIVE UE Mobility:

[0034] When an IDLE or INACTIVE UE is moving, the network provides the priority of each frequency point.

[0035] For co-channel neighboring cells, if the measured evaluation value of the target (or neighbor) cell (calculated based on the measurement result of the target (or neighbor) cell with an offset added) is better than the measured evaluation value of the serving cell (calculated based on the measurement result of the serving cell with an offset added), and it lasts for a certain duration (such as the duration configured by the network), and the UE has stayed in the current serving cell for more than a certain duration (such as 1 s stipulated by the protocol), then the UE reselects to the target (or neighbor) cell.

[0036] For high-priority inter-frequency (i.e., inter-frequency) or inter-RAT (i.e., inter-RAT) neighboring cells, if the measured evaluation value of the target (or neighbor) cell exceeds the threshold value and lasts for a certain duration (such as the duration configured by the network), then the UE reselects to the target (or neighbor) cell.

[0037] For low-priority inter-frequency (i.e., inter-frequency) or inter-RAT (i.e., inter-RAT) neighboring cells, if the measured evaluation value of the target (or neighbor) cell is greater than the threshold value and the measured evaluation value of the current serving cell is less than the threshold value, and it lasts for a certain duration (such as the duration configured by the network), then the UE reselects to the target (or neighbor) cell.

[0038] For inter-frequency (i.e., inter-frequency) or inter-RAT (i.e., inter-RAT) neighboring cells, when the priority of the target (or neighbor) frequency band is the same as the priority of the current serving (or resident) frequency band, the cell reselection method is the same as that of intra-frequency cells.

[0039] IDLE / INACTIVE UEs trigger the connection establishment process by receiving paging messages sent by the network side, thereby enabling data transmission and reception.

[0040] Cell free or dense network:

[0041] See Figure 1b , low-frequency (e.g., FR1) cells have a larger coverage area than high-frequency (e.g., FR2) cells.

[0042] When the terminal moves within the coverage area of FR1, it may continuously change FR2 cells, but the FR1 cell does not change.

[0043] When the terminal initially activates an FR2 cell or switches to an FR2 cell, it needs to continuously measure the signal quality of each beam. Due to the large number of beams, it will result in a long cell activation time or cell handover time. For example, when certain conditions are met, the measurement time can reach the second level, as follows:

[0044] 8ms + 24*T rs +T uncertainty_MAC +T L1-RSRP,measure +T L1-RSRP,report +T HARQ +T FineTiming ;

[0045] The above-mentioned long measurement time will also result in high power consumption of the UE.

[0046] Introduction to the separation of the Centralized Unit (CU) and the Distributed Unit (DU):

[0047] In a 5G system, a base station (gNB) can place its protocol stack entities on different control units respectively. For example, Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP) are placed on the CU, while Radio Link Control (RLC) and Media Access Control (MAC) / Physical Layer (PHY) are placed on the DU. Among them, the CU and the DU have certain radio resource management authorities. For example, the CU can manage the cells of its downlink through RRC messages, and the DU can manage the cells of its downlink through MAC CE messages. Multiple DUs are connected to one CU, and the CU is connected to the core network and other CUs.

[0048] Basic process of terminal system access:

[0049] 1. Initial network search: including Synchronization Signal Block (SSB) synchronization and reception of system information. Specifically, first receive the Primary Synchronization Signals (PSS), then receive the Secondary Synchronization Signals (SSS), and then receive the Physical Broadcast Channel (PBCH): obtain the SSB index, as well as the information in the PBCH RMRS and the Master Information Block (MIB).

[0050] 2. Receive the broadcast system information (SI) according to the information obtained above, which includes the information required for accessing the system.

[0051] 3. Perform random access according to the information required for system access obtained above.

[0052] Random Access Channel (RACH) procedure:

[0053] Currently, the RACH procedure is divided into a competitive random access procedure and a non-competitive random access procedure. The competitive random access procedure is a four-step access of message 1–message 4, as Figure 1c shown. The non-competitive one only requires two steps of message 1 and message 2 for access, as Figure 1d shown.

[0054] message 1-4:

[0055] For both the contention-based random access and the non-contention-based random access, the message 2 is to send a Random Access Response (RAR). The UE listens for the RAR corresponding to the Radio access Radio Network Tempory Identity (RA-RNTI) within the RAR window.

[0056] Due to the problem that the UE may send the same preamble on the same PRACH resource in contention-based random access, after receiving message 2, it is also necessary to send message 3 according to the UL grant in the message. And the UE will carry the UE identifier in message 3, and start the contention resolution timer when message 3 is sent. If the UE receives message 4 sent by the base station before the contention resolution timer times out, the UE's contention resolution is successful. The base station will carry the UE identifier in the message. The UE can determine whether it is its own message 4 based on the UE identifier carried in message 4, and thus determine whether the contention is successful.

[0057] Furthermore, in order to reduce the access system delay, 2-step RACH is introduced: that is, a RACH process including two steps: the terminal sends message A to the network side and then receives message B sent by the network side. Message A includes the functions of the above message 1 or message 1 and message 3, and message B includes the functions of the above message 2 or message 2 and message 4.

[0058] Next, in conjunction with the accompanying drawings, the random access method provided by the embodiments of the present application will be described in detail through specific embodiments and their application scenarios.

[0059] See Figure 2 , an embodiment of the present application provides a random access method, which is applied to a terminal, and the method includes:

[0060] Step 201: Select a target random access channel (RACH) resource associated with the first reference signal and / or the second reference signal;

[0061] Step 202: Initiate random access using the target RACH resource;

[0062] In the embodiments of the present application, the first reference signal is a reference signal unique to the SFN (which can be referred to as SFN specific or SFN super cell specific), and the second reference signal is a reference signal unique to the cell / TRP (which can be referred to as cell / TRP specific). Correspondingly, the cell unique to the SFN can be referred to as the SFN layer cell, and the cell unique to the cell / TRP can be referred to as the cell / TRP layer cell.

[0063] Specifically, in actual deployment, the SFN is the scope of a Super cell, which includes several cells or TRPs. Usually, the SFN super cell is called the SFN layer. The cell corresponding to the Super cell or SFN layer is the cell unique to the SFN (specific); and the several cells or TRPs included within the SFN are the cell / TRP layer, or the cells or TRPs within the SFN. The cell / TRP corresponding to this layer is the cell / TRP unique to the cell / TRP (specific) or the TRP. Correspondingly, the reference signal RS, system message SI, paging message Paging, etc. on the SFN layer are all called the RS, SI, paging, etc. unique to the SFN. The reference signal RS, system message SI, paging message Paging, etc. on the cell / TRP layer are all called the RS, SI, paging, etc. unique to the cell / TRP.

[0064] First, the following terms are explained:

[0065] cell / TRP specific: That is, the relevant configurations corresponding to each cell / TRP are independent. The configurations within the cell / TRP range are the same.

[0066] SFN / super cell specific: That is, the relevant configurations corresponding to each SFN or super cell are independent. The configurations within the SFN range or super cell range are the same.

[0067] It should be noted that the types of the above first reference signal and second reference signal can include multiple types. For example, the reference signal can be an SSB, that is, an SFN specific SSB and a cell / TRP specific SSB. The reference signal can also be various reference signals such as a Channel-State Information reference Signal (CSI-RS), a Cell Reference Signal (CRS), a Sounding Reference Signal (SRS), and a Demodulation Reference Signal (DMRS).

[0068] In some embodiments, when the network deploys high-frequency and low-frequency layers, the cells unique to the SFN include cells in the low-frequency range, and the cells unique to the cell / TRP include cells in the high-frequency range; or, when the network includes a satellite communication network (satellite or HAPS), the cells unique to the SFN include High Altitude Platform Station (HAPS) cells or geostationary satellite cells, and the cells unique to the cell / TRP include low-earth orbit satellite cells or cells covered by a ground base station.

[0069] In the embodiments of the present application, when the SFN specific reference signal has an associated RACH resource, this RACH resource is shared for all cell / TRPs within the SFN (super cell) range.

[0070] The terminal selects a target RACH resource, which is a RACH resource associated with the reference signal unique to the SFN and / or the reference signal unique to the cell / TRP, and the terminal uses the target RACH resource to initiate a random access.

[0071] Specifically, for the case where the terminal uses the RACH resource associated with the cell / TRP specific reference signal, existing RACH resource configurations and random access methods can be adopted, which will not be elaborated here.

[0072] For the case where the terminal uses the RACH resources of the SFN specific SSB reference signal, that is, when the target RACH resource is the RACH resource associated with the first reference signal, the target RACH resource is configured by the system message unique to the SFN or the system message unique to the cell / TRP.

[0073] Further, in some embodiments, the terminal selects the target random access channel (RACH) resource associated with the first reference signal and / or the second reference signal, including at least one of the following:

[0074] (1) Select the target RACH resource according to the preset priority criterion:

[0075] In the embodiments of the present application, selecting the RACH resource based on the preset priority criterion includes:

[0076] a. Preferentially select the RACH resource associated with the first reference signal, that is, the RACH resource associated with the SFN specific reference signal is preferred;

[0077] b. Preferentially select the contention-free random access (CFRA) RACH resource, that is, the CFRA RACH resource is preferred;

[0078] c. Preferentially select the RACH resource associated with the second reference signal, that is, the RACH resource associated with the cell / TRP specific reference signal is preferred;

[0079] d. Select the target RACH resource according to the preset priority order, that is, equivalent to the combination of the above methods a and b. Specifically, the CFRA RACH resource associated with the SFN specific reference signal is prior to the CFRA RACH resource associated with the cell / TRP specific reference signal, which is prior to the CBRA RACH resource associated with the SFN specific reference signal, which is prior to the CBRA RACH resource associated with the cell / TRP specific reference signal.

[0080] (2) Select the target RACH resource according to the measurement results of the first reference signal and / or the second reference signal:

[0081] In the embodiments of the present application, the measurement results include at least one of the reference signal receiving power (RSRP) of the reference signal measurement, the reference signal receiving quality (RSRQ), the signal to interference plus noise ratio (SINR), the received signal strength indication (RSSI), etc. Selecting RACH resources based on the measurement results includes:

[0082] e. When the measurement result of the first reference signal is higher than the first threshold, select the RACH resource associated with the first reference signal. Specifically, when selecting, select any one of the corresponding RACH resources among the reference signals higher than the first threshold; or, when the measurement result of the first reference signal is not higher than the second threshold, select the RACH resource associated with the second reference signal;

[0083] Further, method e can be combined with the above preset priority criteria, that is, combined with methods a - d:

[0084] e + a: Among the RACH resources corresponding to the reference signals with measurement results higher than the first threshold, the RACH resources associated with the SFN specific reference signal are preferred;

[0085] e + b: Among the RACH resources corresponding to the reference signals with measurement results higher than the first threshold, the CFRA RACH resources are preferred;

[0086] e + c: Among the RACH resources corresponding to the reference signals with measurement results higher than the first threshold, the RACH resources associated with the cell / TRP specific reference signal are preferred;

[0087] e + d: Among the RACH resources corresponding to the reference signals with measurement results higher than the first threshold, select the target RACH resource according to the preset priority order. Specifically, the CFRA RACH resources associated with the SFN specific reference signal are prior to the CFRA RACH resources associated with the cell / TRP specific reference signal, prior to the CBRA RACH resources associated with the SFN specific reference signal, prior to the CBRA RACH resources associated with the cell / TRP specific reference signal;

[0088] f. When the measurement result of the second reference signal is higher than the third threshold, select the RACH resource associated with the second reference signal; or, when the measurement result of the second reference signal is not higher than the fourth threshold, select the RACH resource associated with the first reference signal;

[0089] g. When the measurement result of the third reference signal is higher than the fifth threshold of the measurement result of the fourth reference signal, select the RACH resource associated with the third reference signal, the fifth threshold is greater than or equal to 0, the third reference signal is the first reference signal or the second reference signal, and the fourth reference signal is the first reference signal or the second reference signal;

[0090] In the embodiments of the present application, the third reference signal and the fourth reference signal may be of the same type, such as both cell / TRP specific reference signals, or both SFN specific reference signals; the third reference signal and the fourth reference signal may also be of different types, such as the third reference signal is a cell / TRP specific reference signal, the fourth reference signal is an SFN specific reference signal, or the third reference signal is an SFN specific reference signal, and the fourth reference signal is a cell / TRP specific reference signal.

[0091] h. Select the RACH resource associated with the reference signal with the highest measurement result among the first reference signal and the second reference signal;

[0092] In the embodiments of the present application, select the RACH resource corresponding to the reference signal with the best measurement result, that is, compare the cell / TRP specific reference signal and the SFN specific reference signal together and select the best one.

[0093] (3) Select the target RACH resource according to time domain, frequency domain or space domain:

[0094] In the embodiments of the present application, selecting the RACH resource based on time domain, frequency domain or space domain includes:

[0095] i. Select the RACH resource associated with the target reference signal, where the target reference signal is the reference signal received latest before initiating random access;

[0096] In the embodiments of the present application, select the RACH resource associated with the latest one reference signal received before initiating RACH; specifically, the last reference signal may be the first reference signal or the second reference signal.

[0097] Further, select the reference signal whose measurement result received most recently before initiating random access is greater than the first threshold, that is, select the RACH resource associated with the reference signal that is the closest and whose measurement result is higher than the first threshold.

[0098] (4) Select the target RACH resource according to the type of the terminal or the state of the terminal or the type of the service:

[0099] In the embodiments of the present application, selection is based on the type of the terminal, different states of the terminal, type of the service, etc., including:

[0100] j. Different SFN specific reference signals or cell / TRP specific reference signals corresponding to different terminal types or similar services;

[0101] For example: The terminal type that supports SFN SSB (preferably) uses the RACH resource corresponding to the SFN specific reference signal. Another example: The terminal in the state of camping in the SFN super cell (preferably) uses the RACH resource corresponding to the SFN specific reference signal.

[0102] In some embodiments, the above several methods can be further combined:

[0103] For example: Select the CFRA RACH resource corresponding to the reference signal whose measurement result is higher than the first threshold and the measurement result of the SSB specific reference signal is higher than the measurement result of the cell / TRP specific reference signal, and the difference is greater than the second threshold.

[0104] In some embodiments, when the first reference signal and the second reference signal exist simultaneously, the method further includes: when the measurement result of the first reference signal is lower than the preset reference threshold, receiving or measuring the second reference signal, that is, if the measurement result of the SFN specific reference signal is lower than a certain reference threshold, then receiving or measuring the cell / TRP specific reference signal.

[0105] In some embodiments, when the first reference signal and the second reference signal exist simultaneously, the method further includes: before initiating random access, receiving the system message specific to the SFN and / or the system message specific to the cell / TRP; and / or, before initiating random access, receiving or measuring the second reference signal, that is, before RACH, the terminal always receives the SFN specific and / or cell / TRP specific SI, and / or, before RACH, the terminal always receives or measures the cell specific reference signal.

[0106] In some embodiments, the configuration of the RACH resources corresponding to the above SFN specific reference signal may be one of the following:

[0107] The configuration information is included in the SFN specific SI, or the cell / TRP specific SI.

[0108] 1. The RACH resources of all cells within the SFN are the same and are configured by the system message specific to the SFN, or the same content is configured by the system message specific to the cell / TRP.

[0109] Furthermore, when an SFN change or a cell change within the SFN occurs during the RACH process, the RACH process continues based on the RACH resources associated with the SFN specific reference signal. That is, if an SFN (supercell) change or a cell change between SFN (super cells) occurs during the RACH process, including cell selection reselection or handover (synchronous reconfiguration), etc., the RACH process based on the SFN specific reference signal continues.

[0110] 2. The RACH resources of all cells within the SFN are independent and are configured by the system message specific to the SFN, or are separately configured by the system message specific to the cell / TRP.

[0111] Furthermore, when an SFN change or a cell change within the SFN occurs during the RACH process, the RACH process is aborted or restarted based on the RACH resources associated with the SFN specific reference signal. That is, the RACH of all cells / TRPs within the SFN is individual, that is, it is configured within the SFN super cell, but the RACH resources between individual cells / TRPs can be different. Specifically, the corresponding configuration is configured in the SFN specific SI (all cells / TRPs within the SFN super cell need to be configured), or all cell / TRP specific SIs are configured separately. If an SFN (super cell) change or a cell change between SFN (super cells) occurs during the RACH process, including cell selection reselection or handover (synchronous reconfiguration), etc., the RACH process based on the SFN SSB is aborted or restarted.

[0112] Furthermore, the method further includes:

[0113] Receive cell / TRP-specific system information if a cell change within the SFN occurs before preamble transmission. Alternatively, receive SFN-specific system information if an SFN change or a cell change between SFNs occurs before preamble transmission.

[0114] It should be noted that for the random access method provided in the embodiments of the present application, the execution entity can be a random access device, or a control module in the random access device for executing the random access method. In the embodiments of the present application, the random access method is executed by the random access device as an example to illustrate the random access device provided in the embodiments of the present application.

[0115] See Figure 3 , the embodiments of the present application provide a random access device 300, which is applied to a terminal and includes:

[0116] A selection module 301, configured to select a target random access channel RACH resource associated with the first reference signal and / or the second reference signal;

[0117] An access module 302, configured to initiate random access using the target RACH resource;

[0118] Wherein, the first reference signal is a reference signal specific to a single frequency network SFN, and the second reference signal is a reference signal specific to a cell or a transmission and reception point cell / TRP.

[0119] In some embodiments, when the target RACH resource is a RACH resource associated with the first reference signal, the target RACH resource is configured by an SFN-specific system message or a cell / TRP-specific system message.

[0120] In some embodiments, the selection module is further configured to perform at least one of the following:

[0121] Select the target RACH resource according to a preset priority criterion;

[0122] Select the target RACH resource according to the measurement results of the first reference signal and / or the second reference signal;

[0123] Select the target RACH resource according to time domain, frequency domain or spatial domain;

[0124] Select the target RACH resource according to the type of the terminal or the state of the terminal or the type of the service.

[0125] In some embodiments, the selection module is further configured to perform at least one of the following:

[0126] Preferentially select the RACH resources associated with the first reference signal;

[0127] Preferentially select non-competitive random access CFRA RACH resources;

[0128] Preferentially select the RACH resources associated with the second reference signal;

[0129] Select the target RACH resources according to a preset priority order.

[0130] In some embodiments, the selection module is further configured to perform at least one of the following:

[0131] When the measurement result of the first reference signal is higher than a first threshold, select the RACH resources associated with the first reference signal; or, when the measurement result of the first reference signal is not higher than a second threshold, select the RACH resources associated with the second reference signal;

[0132] When the measurement result of the second reference signal is higher than a third threshold, select the RACH resources associated with the second reference signal; or, when the measurement result of the second reference signal is not higher than a fourth threshold, select the RACH resources associated with the first reference signal;

[0133] When the measurement result of a third reference signal is higher than a fifth threshold of the measurement result of a fourth reference signal, select the RACH resources associated with the third reference signal, the fifth threshold being greater than or equal to 0, the third reference signal being the first reference signal or the second reference signal, and the fourth reference signal being the first reference signal or the second reference signal;

[0134] Select the RACH resources associated with the reference signal with the highest measurement result among the first reference signal and the second reference signal.

[0135] In some embodiments, the selection module is further configured to:

[0136] Select the RACH resources associated with a target reference signal, the target reference signal being the reference signal received most recently before initiating random access.

[0137] In some embodiments, the selection module is further configured to:

[0138] Select the RACH resources associated with a target reference signal, the target reference signal being the reference signal whose measurement result is greater than a first threshold and was received most recently before initiating random access.

[0139] In some embodiments, when both a first reference signal and a second reference signal exist, the device further includes:

[0140] A first processing module, configured to receive or measure the second reference signal when the measurement result of the first reference signal is lower than a preset reference threshold.

[0141] In some embodiments, when the first reference signal and the second reference signal exist simultaneously, the apparatus further includes:

[0142] A second processing module, configured to receive system information specific to the SFN and / or system information specific to the cell / TRP before initiating random access; and / or, receive or measure the second reference signal before initiating random access.

[0143] In some embodiments, the RACH resources of all cells within the SFN are the same and are configured by the system information specific to the SFN, or the same content is configured by the system information specific to the cell / TRP.

[0144] In some embodiments, the access module is further configured to:

[0145] When an SFN change or a cell change within the SFN occurs during the RACH process, continue the RACH process based on the RACH resources associated with the reference signal specific to the SFN.

[0146] In some embodiments, the RACH resources of all cells within the SFN are independent and are configured by the system information specific to the SFN, or are separately configured by the system information specific to the cell / TRP.

[0147] In some embodiments, the access module is further configured to:

[0148] When an SFN change or a cell change within the SFN occurs during the RACH process, abort the RACH process or restart the RACH process based on the RACH resources associated with the reference signal specific to the SFN.

[0149] In some embodiments, the apparatus further includes:

[0150] A second processing module, configured to receive the system information specific to the cell / TRP if a cell change within the SFN occurs before preamble transmission; or, receive the system information specific to the SFN if an SFN change or a cell change between SFNs occurs before preamble transmission.

[0151] In some embodiments, when the network is deployed with a high-frequency range and a low-frequency range, the cells specific to the SFN include the cells within the low-frequency range, and the cells specific to the cell / TRP include the cells within the high-frequency range;

[0152] Alternatively,

[0153] When the network includes a satellite communication network, the cells unique to the SFN include HAPS cells or high-orbit satellite cells, and the cells unique to the cell / TRP include low-orbit satellite cells or cells covered by a terrestrial base station.

[0154] In the embodiments of the present application, initiating random access using the RACH resources associated with the reference signal unique to the SFN and / or the reference signal unique to the cell / TRP can achieve fast RACH access and effectively save the power consumption of the terminal.

[0155] The random access device in the embodiments of the present application can be a device, or a component, an integrated circuit, or a chip in a terminal. The device can be a mobile terminal or a non-mobile terminal. Exemplarily, the mobile terminal can include, but is not limited to, the types of terminals listed above, and the non-mobile terminal can be a server, a Network Attached Storage (NAS), a personal computer (PC), a television (TV), a teller machine, or a self-service machine, etc., which are not specifically limited in the embodiments of the present application.

[0156] The random access device in the embodiments of the present application can be a device with an operating system. The operating system can be an Android operating system, an ios operating system, or other possible operating systems, which are not specifically limited in the embodiments of the present application.

[0157] Figure 4 Schematic diagram of the hardware structure of a terminal for implementing the embodiments of the present application.

[0158] The terminal 400 includes, but is not limited to: a radio frequency unit 401, a network module 402, an audio output unit 403, an input unit 404, a sensor 405, a display unit 406, a user input unit 407, an interface unit 408, a memory 409, and a processor 410, etc.

[0159] Those skilled in the art can understand that the terminal 400 may further include a power supply (such as a battery) for supplying power to each component. The power supply can be logically connected to the processor 410 through a power management system, so as to implement functions such as management of charging, discharging, and power consumption management through the power management system. Figure 4 The terminal structure shown does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0160] It should be understood that in the embodiments of the present application, the input unit 404 may include a Graphics Processing Unit (GPU) 4041 and a microphone 4042. The GPU 4041 processes the image data of static pictures or videos obtained by an image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 406 may include a display panel 4061, and the display panel 4061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 407 includes a touch panel 4071 and other input devices 4072. The touch panel 4071 is also called a touch screen. The touch panel 4071 may include two parts: a touch detection device and a touch controller. The other input devices 4072 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 elaborated here.

[0161] In the embodiments of the present application, after receiving the downlink data from the radio access network side device, the radio frequency unit 401 sends it to the processor 410 for processing; in addition, it sends the uplink data to the radio access network side device. Generally, the radio frequency unit 401 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0162] The memory 409 can be used to store software programs or instructions and various data. The memory 409 mainly includes a program or instruction storage area and a data storage area. Among them, the program or instruction storage area can 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 409 may include a high-speed random access memory, and may also include a non-volatile memory. The non-volatile memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM), or a flash memory. For example, at least one disk storage device, a flash memory device, or other non-volatile solid state storage devices.

[0163] The processor 410 may include one or more processing units; optionally, the processor 410 may integrate an application processor and a modulation and demodulation processor. Among them, the application processor mainly processes an operating system, a user interface, and applications or instructions, etc., and the modulation and demodulation processor mainly processes wireless communications, such as a baseband processor. It can be understood that the above modulation and demodulation processor may not be integrated into the processor 410 either.

[0164] Among them, the processor 410 is used to select a target random access channel (RACH) resource associated with the first reference signal and / or the second reference signal;

[0165] The processor 410 is further used to initiate random access using the target RACH resource;

[0166] Among them, the first reference signal is a reference signal unique to a single-frequency network (SFN), and the second reference signal is a reference signal unique to a cell or a transmission and reception point (cell / TRP).

[0167] Optionally, when the target RACH resource is a RACH resource associated with the first reference signal, the target RACH resource is configured through a system message unique to the SFN or a system message unique to the cell / TRP.

[0168] Optionally, the processor 410 is further used for at least one of the following:

[0169] Select the target RACH resource according to a preset priority criterion;

[0170] Select the target RACH resource according to the measurement result of the first reference signal and / or the second reference signal;

[0171] Select the target RACH resource according to time domain, frequency domain or spatial domain;

[0172] Select the target RACH resource according to the type of the terminal or the state of the terminal or the type of the service.

[0173] Optionally, the processor 410 is further used for at least one of the following:

[0174] Preferentially select a RACH resource associated with the first reference signal;

[0175] Preferentially select a contention-free random access (CFRA) RACH resource;

[0176] Preferentially select a RACH resource associated with the second reference signal;

[0177] Select the target RACH resource according to a preset priority order.

[0178] Optionally, the processor 410 is further used for at least one of the following:

[0179] When the measurement result of the first reference signal is higher than a first threshold, select a RACH resource associated with the first reference signal; or, when the measurement result of the first reference signal is not higher than a second threshold, select a RACH resource associated with the second reference signal;

[0180] When the measurement result of the second reference signal is higher than the third threshold, select the RACH resource associated with the second reference signal; or, when the measurement result of the second reference signal is not higher than the fourth threshold, select the RACH resource associated with the first reference signal;

[0181] When the measurement result of the third reference signal is higher than the fifth threshold of the measurement result of the fourth reference signal, select the RACH resource associated with the third reference signal, where the third threshold is greater than or equal to 0, the third reference signal is the first reference signal or the second reference signal, and the fourth reference signal is the first reference signal or the second reference signal;

[0182] Select the RACH resource associated with the reference signal with the highest measurement result among the first reference signal and the second reference signal.

[0183] Optionally, the processor 410 is further configured to:

[0184] Select the RACH resource associated with the target reference signal, where the target reference signal is the reference signal received most recently before the random access is initiated.

[0185] Optionally, the processor 410 is further configured to:

[0186] Select the RACH resource associated with the target reference signal, where the target reference signal is the reference signal whose measurement result is greater than the first threshold and is received most recently before the random access is initiated.

[0187] Optionally, when both the first reference signal and the second reference signal exist, the processor 410 is further configured to receive or measure the second reference signal when the measurement result of the first reference signal is lower than the preset reference threshold.

[0188] Optionally, when both the first reference signal and the second reference signal exist, the processor 410 is further configured to receive the system message specific to the SFN and / or the system message specific to the cell / TRP before initiating the random access; and / or, receive or measure the second reference signal before initiating the random access.

[0189] Optionally, the RACH resources of all cells within the SFN are the same and are configured by the system message specific to the SFN, or the same content is configured by the system message specific to the cell / TRP.

[0190] Optionally, the processor 410 is further configured to:

[0191] When an SFN change or a cell change within the SFN occurs during the RACH procedure, the RACH procedure continues to be performed based on the RACH resources associated with the SFN-specific reference signal.

[0192] Optionally, the RACH resources of all cells within the SFN are independent and are configured by the SFN-specific system information, or are separately configured by the cell / TRP-specific system information.

[0193] Optionally, the processor 410 is further configured to:

[0194] When an SFN change or a cell change within the SFN occurs during the RACH procedure, abort the RACH procedure or restart the RACH procedure based on the RACH resources associated with the SFN-specific reference signal.

[0195] Optionally, the processor 410 is further configured to receive the cell / TRP-specific system information if a cell change within the SFN occurs before the preamble transmission; or, receive the SFN-specific system information if an SFN change or a cell change between SFNs occurs before the preamble transmission.

[0196] Optionally, when the network is deployed with a high-frequency range and a low-frequency range, the cells specific to the SFN include the cells within the low-frequency range, and the cells specific to the cell / TRP include the cells within the high-frequency range;

[0197] Or, when the network includes a satellite communication network, the cells specific to the SFN include HAPS cells or high-orbit satellite cells, and the cells specific to the cell / TRP include low-orbit satellite cells or cells covered by a ground base station

[0198] The embodiments of the present application further provide a readable storage medium, on which a program or an instruction is stored. When the program or the instruction is executed by a processor, each process of the above-mentioned random access method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, details are not described herein again.

[0199] Wherein, 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 (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk, or an optical disc, etc.

[0200] Another embodiment of the present application also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is configured to run a terminal program or instruction to implement the method described in the first aspect, or implement each process of the above-mentioned random access method embodiment; or configured to run a radio access network side device program or instruction to implement each process of the above-mentioned random access method embodiment; or configured to run a core network side device program or instruction to implement each process of the above-mentioned random access method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0201] It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, system chip, chip system, or system-on-chip.

[0202] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including 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 reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0203] 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 software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases, the former is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disc), and includes several instructions for causing a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present application.

[0204] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative rather than restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A random access method, applied to a terminal, characterized in that, The method includes: Selecting a target RACH resource from among the RACH resources associated with a first reference signal and the RACH resources associated with a second reference signal; Initiating random access using the target RACH resource; Wherein, the first reference signal is a reference signal unique to a single-frequency network (SFN), the second reference signal is a reference signal unique to a cell or a transmission and reception point (cell / TRP), and the same SFN-unique reference signal is transmitted in multiple cells within the SFN range; The selecting of the target RACH resource from among the RACH resources associated with the first reference signal and the RACH resources associated with the second reference signal includes: Selecting the target RACH resource from among the RACH resources associated with the first reference signal and the RACH resources associated with the second reference signal according to the type of the terminal or the state of the terminal or the type of the service.

2. The method according to claim 1, characterized in that, When the target RACH resource is a RACH resource associated with the first reference signal, the target RACH resource is configured by an SFN-unique system message or a cell / TRP-unique system message.

3. The method according to claim 1, wherein The selecting of a target random access channel (RACH) resource associated with the first reference signal and / or the second reference signal further includes at least one of the following: Selecting the target RACH resource according to a preset priority criterion; Selecting the target RACH resource according to the measurement result of the first reference signal and / or the second reference signal; Selecting the target RACH resource according to time domain, frequency domain or spatial domain.

4. The method according to claim 3, characterized in that, The selecting of the target RACH resource according to a preset priority criterion includes any one of the following: Preferentially selecting the RACH resource associated with the first reference signal; Preferentially selecting a contention-free random access (CFRA) RACH resource; Preferentially selecting the RACH resource associated with the second reference signal; Selecting the target RACH resource in accordance with a preset priority order.

5. The method according to claim 3, characterized in that, The selecting of the target RACH resource according to the measurement result of the first reference signal and / or the second reference signal includes: When the measurement result of the first reference signal is higher than a first threshold, selecting the RACH resource associated with the first reference signal; Or, when the measurement result of the first reference signal is not higher than a second threshold, selecting the RACH resource associated with the second reference signal; Or, when the measurement result of the second reference signal is higher than a third threshold, selecting the RACH resource associated with the second reference signal; Or, when the measurement result of the second reference signal is not higher than a fourth threshold, selecting the RACH resource associated with the first reference signal; Or, when the measurement result of a third reference signal is greater than a fifth threshold than the measurement result of a fourth reference signal, selecting the RACH resource associated with the third reference signal, the fifth threshold being greater than or equal to 0, the third reference signal being the first reference signal or the second reference signal, and the fourth reference signal being the first reference signal or the second reference signal; Or, selecting the RACH resource associated with the reference signal having the highest measurement result among the first reference signal and the second reference signal.

6. The method according to claim 3, wherein Selecting the target RACH resource according to time domain, frequency domain or space domain includes: Selecting a RACH resource associated with a target reference signal, where the target reference signal is the reference signal received most recently before initiating random access.

7. The method according to claim 3, characterized in that, Selecting the target RACH resource according to time domain, frequency domain or space domain includes: Selecting a RACH resource associated with a target reference signal, where the target reference signal is a reference signal whose measurement result is greater than a first threshold before initiating random access.

8. The method according to claim 1, wherein When a first reference signal and a second reference signal exist simultaneously, the method further includes: When the measurement result of the first reference signal is lower than a preset reference threshold, receiving or measuring the second reference signal.

9. The method according to claim 1, wherein When a first reference signal and a second reference signal exist simultaneously, the method further includes: Before initiating random access, receiving system messages specific to the SFN and / or system messages specific to the cell / TRP; and / or Before initiating random access, receiving or measuring the second reference signal.

10. The method according to claim 2, wherein: The RACH resources of all cells within the SFN are the same and are configured by system messages specific to the SFN, or the same content is configured by system messages specific to the cell / TRP.

11. The method according to claim 10, wherein: When an SFN change or a change in cells within the SFN occurs during the RACH process, continue the RACH process based on the RACH resource associated with the SFN-specific reference signal.

12. The method according to claim 2, wherein: The RACH resources of all cells within the SFN are independent and are configured by system messages specific to the SFN, or are separately configured by system messages specific to the cell / TRP.

13. The method according to claim 12, wherein: When an SFN change or a change in cells within the SFN occurs during the RACH process, abort the RACH process or restart the RACH process based on the RACH resource associated with the SFN-specific reference signal.

14. The method according to claim 12, wherein The method further includes: Before transmitting the preamble, if a change in cells within the SFN occurs, receiving system messages specific to the cell / TRP; or Before transmitting the preamble, if an SFN change or a change in cells between SFNs occurs, receiving system messages specific to the SFN.

15. The method according to claim 1, wherein: When the network is deployed with a high-frequency range and a low-frequency range, the cells specific to the SFN include the cells within the low-frequency range, and the cells specific to the cell / TRP include the cells within the high-frequency range; or When the network includes a satellite communication network, the cells specific to the SFN include HAPS cells or high-orbit satellite cells, and the cells specific to the cell / TRP include low-orbit satellite cells or cells covered by ground base stations.

16. A random access device, applied to a terminal, characterized in that, including: A selection module, configured to select a target RACH resource from among the RACH resources associated with a first reference signal and the RACH resources associated with a second reference signal; An access module, configured to initiate random access using the target RACH resource; Wherein, the first reference signal is a reference signal unique to a single-frequency network (SFN), and the second reference signal is a reference signal unique to a cell or a transmission / reception point (cell / TRP). The same SFN-unique reference signal is transmitted by multiple cells within the SFN range; The selection module is further configured to: Select the target RACH resource from among the RACH resources associated with the first reference signal and the RACH resources associated with the second reference signal according to the type of the terminal or the state of the terminal or the type of the service.

17. The device according to claim 16, characterized in that, When the target RACH resource is a RACH resource associated with the first reference signal, the target RACH resource is configured by a system message unique to the SFN or a system message unique to the cell / TRP.

18. The device according to claim 16, characterized in that, The selection module is further configured to perform at least one of the following: Select the target RACH resource according to a preset priority criterion; Select the target RACH resource according to the measurement result of the first reference signal and / or the second reference signal; Select the target RACH resource according to time domain, frequency domain or spatial domain.

19. The device according to claim 18, wherein, The selection module is further configured to perform any one of the following: Preferentially select the RACH resource associated with the first reference signal; Preferentially select a contention-free random access (CFRA) RACH resource; Preferentially select the RACH resource associated with the second reference signal; Select the target RACH resource in accordance with a preset priority order.

20. The device according to claim 18, wherein The selection module is further configured to: When the measurement result of the first reference signal is higher than a first threshold, select the RACH resource associated with the first reference signal; Or, when the measurement result of the first reference signal is not higher than a second threshold, select the RACH resource associated with the second reference signal; Or, when the measurement result of the second reference signal is higher than a third threshold, select the RACH resource associated with the second reference signal; Or, when the measurement result of the second reference signal is not higher than a fourth threshold, select the RACH resource associated with the first reference signal; Or, when the measurement result of a third reference signal is greater than a fifth threshold than the measurement result of a fourth reference signal, select the RACH resource associated with the third reference signal, where the fifth threshold is greater than or equal to 0, the third reference signal is the first reference signal or the second reference signal, and the fourth reference signal is the first reference signal or the second reference signal; Or, select the RACH resource associated with the reference signal with the highest measurement result among the first reference signal and the second reference signal.

21. The device according to claim 18, characterized in that, The selection module is further configured to: Select the RACH resource associated with a target reference signal, where the target reference signal is the reference signal received most recently before initiating random access.

22. The device according to claim 18, characterized in that, The selection module is further configured to: Select a RACH resource associated with a target reference signal, where the target reference signal is a reference signal whose measurement result received latest before random access is initiated is greater than a first threshold.

23. The device according to claim 16, characterized in that, When a first reference signal and a second reference signal exist simultaneously, the apparatus further includes: A first processing module, configured to receive or measure the second reference signal when the measurement result of the first reference signal is lower than a preset reference threshold.

24. The device according to claim 16, characterized in that, When a first reference signal and a second reference signal exist simultaneously, the apparatus further includes: A second processing module, configured to receive system information specific to an SFN and / or system information specific to a cell / TRP before initiating random access; and / or, receive or measure the second reference signal before initiating random access.

25. The apparatus according to claim 17, wherein The RACH resources of all cells within an SFN are the same and are configured by system information specific to the SFN, or the same content is configured by system information specific to a cell / TRP.

26. The device according to claim 25, characterized in that, The access module is further configured to: When an SFN change or a change in cells within an SFN occurs during a RACH procedure, continue to perform the RACH procedure based on the RACH resource associated with the SFN-specific reference signal.

27. The apparatus according to claim 17, wherein The RACH resources of all cells within an SFN are independent and are configured by system information specific to the SFN, or are individually configured by system information specific to a cell / TRP.

28. The device according to claim 27, characterized in that, The access module is further configured to: When an SFN change or a change in cells within an SFN occurs during a RACH procedure, abort the RACH procedure or restart the RACH procedure based on the RACH resource associated with the SFN-specific reference signal.

29. The device according to claim 27, characterized in that, The apparatus further includes: A second processing module, configured to receive system information specific to a cell / TRP if a change in cells within an SFN occurs before preamble transmission; or, receive system information specific to the SFN if a change in the SFN or a change in cells between SFNs occurs before preamble transmission.

30. The apparatus according to claim 16, wherein When the network is deployed with a high-frequency range and a low-frequency range, the cells specific to the SFN include the cells within the low-frequency range, and the cells specific to the cell / TRP include the cells within the high-frequency range; Or, When the network includes a satellite communication network, the cells specific to the SFN include HAPS cells or high-orbit satellite cells, and the cells specific to the cell / TRP include low-orbit satellite cells or cells covered by a ground base station.

31. A terminal, characterized in that, Including a processor, a memory, and a program or instruction stored on the memory and executable on the processor, where when the program or instruction is executed by the processor, the steps of the random access method according to any one of claims 1 to 15 are implemented.

32. A readable storage medium, characterized in that, A program or instruction is stored on the readable storage medium, where when the program or instruction is executed by the processor, the steps of the random access method according to any one of claims 1 to 15 are implemented.

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