Random access method and apparatus, and device, storage medium and program product

Abstract

Disclosed in the present disclosure are a random access method and apparatus, and a device, a storage medium and a program product. The method comprises: a terminal side receiving random access configuration information issued by a base station, wherein the random access configuration information comprises a received power determination threshold; when initiating random access, the terminal side determining a target transmission node on the basis of the magnitude relationship between the received power of a target SSB reference signal and the received power determination threshold, wherein the target transmission node is a base station or a preset uplink transmission node; and completing a random access procedure by means of the target transmission node. By using the present disclosure, a target transmission node for random access can be determined on the basis of configuration information issued by a base station, thereby improving random access efficiency and resource utilization.

Description

Random access method, device, apparatus, storage medium and program product

[0001] Cross-reference to related applications

[0002] The present disclosure claims priority from Chinese Patent Application No. 202410982191.X filed on July 22, 2024, the disclosure of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of wireless transmission, and in particular to a random access method, device, apparatus, storage medium and program product. BACKGROUND

[0004] Currently, in the data transmission process of a terminal and a base station, the transmit power and the number of transmit antennas of the terminal are significantly lower than those of the base station side, resulting in an uplink-downlink asymmetry problem. The uplink coverage of a cell edge user far from the base station is limited, and it is difficult to meet the requirements of uplink transmission performance. Therefore, the prior art proposes that Uplink only (UL-only) nodes can be densely deployed in a cell to assist in enhancing the uplink transmission of cell edge users. The UL-only nodes can be designed without any hardware for downlink transmission, thereby reducing the cost of dense deployment of nodes. The UL-only nodes are connected to the macro base station in the form of optical fiber. From the perspective of the terminal, only downlink transmission signals are received from the macro base station, and signals are transmitted to the UL-only nodes in the uplink, thereby reducing the path loss of the terminal uplink transmission and increasing the uplink throughput. This not only helps to achieve terminal energy saving, but also significantly improves the uplink signal-to-interference-and-noise ratio of cell edge users.

[0005] However, the inventors have found that the prior art at least has the following problem: for a cell with UL-only nodes, the base station side needs to determine whether the UL-only nodes provide services during uplink transmission according to the location of the terminal, and configure uplink transmission resources for the terminal. However, under the current random access mechanism, the terminal only interacts with the macro base station, and even if the UL-only nodes are deployed in the cell, the terminal cannot determine whether it is necessary to access through the UL-only nodes. If the terminal enters a connected state and fails multiple times after uplink transmission, and then the macro base station is configured to switch to a certain UL-only node to carry out uplink transmission, the uplink throughput of cell edge users will be significantly reduced. SUMMARY

[0006] The purpose of the embodiments of the present disclosure is to provide a random access method, device, apparatus, storage medium and program product.

[0007] The embodiments of the present disclosure provide a random access method applied to a terminal side, the method comprising:

[0008] receiving random access configuration information sent by a base station; wherein the random access configuration information comprises a receiving power judgment threshold;

[0009] when initiating random access, determining a target transmission node according to a size relationship between a receiving power of a target SSB reference signal and the receiving power judgment threshold; wherein the target transmission node is a base station or a preset uplink transmission node;

[0010] completing a random access process through the target transmission node.

[0011] In some embodiments, the determining of the target transmission node according to the size relationship between the receiving power of the target SSB reference signal and the receiving power judgment threshold comprises:

[0012] when the receiving power of the target SSB reference signal is less than or equal to the receiving power judgment threshold, determining that the uplink transmission node is the target transmission node;

[0013] when the receiving power of the target SSB reference signal is greater than the receiving power judgment threshold, determining that the base station is the target transmission node.

[0014] In some embodiments, the random access configuration information further comprises a mapping relationship among a preset SSB reference signal, a transmission node, a random access resource and a random access preamble;

[0015] then the completing of the random access process through the target transmission node comprises:

[0016] selecting, according to the mapping relationship, a target SSB reference signal, a target random access resource corresponding to the target transmission node and a target random access preamble;

[0017] sending the target random access preamble through the target random access resource, and establishing a connection with the target transmission node.

[0018] In some embodiments, the method further comprises:

[0019] when the target transmission node is the base station, sending a random access resource through a first sending power in a random access process;

[0020] when the target transmission node is the uplink transmission node, sending a random access resource through a second sending power in a random access process; wherein the second sending power is a difference between the first sending power and a preset power offset.

[0021] In some embodiments, the maximum value of the preset power offset is a transmission power calculated according to a path loss between the uplink transmission node and the terminal.

[0022] In some embodiments, the random access configuration information further comprises a path loss between the base station and the uplink transmission node, denoted as a first path loss.

[0023] The path loss between the uplink transmission node and the terminal is then calculated by:

[0024] According to the received power of the target SSB reference signal, a path loss between the base station and the terminal is calculated, denoted as a second path loss.

[0025] According to the difference between the second path loss and the first path loss, the path loss between the uplink transmission node and the terminal is calculated.

[0026] The embodiments of the present disclosure further provide another random access method, applied to the base station side, the method comprising:

[0027] Determining random access configuration information; wherein the random access configuration information comprises a received power judgment threshold.

[0028] Downlink the random access configuration information to the terminal, so that the terminal, when initiating random access, determines a target transmission node according to the size relationship between the received power of a target SSB reference signal and the received power judgment threshold, and completes the random access process through the target transmission node; wherein the target transmission node is a base station or a preset uplink transmission node.

[0029] In some embodiments, the random access configuration information further comprises a mapping relationship between a preset SSB reference signal, a transmission node, a random access resource and a random access preamble.

[0030] The terminal can then select the target SSB reference signal, the target random access resource corresponding to the target transmission node and the target random access preamble according to the mapping relationship; send the target random access preamble using the target random access resource, and establish a connection with the target transmission node.

[0031] In some embodiments, determining the mapping relationship between the preset SSB reference signal, the transmission node, the random access resource and the random access preamble comprises:

[0032] According to a preset joint mapping relationship among SSB reference signals, random access resources and random access preambles, a mapping relationship among SSB reference signals, transmission nodes, random access resources and random access preambles is established in a two-grouping manner; the transmission node is a base station or a preset uplink transmission node.

[0033] The embodiment of the present disclosure further provides a random access device applied to a terminal side, the device comprising:

[0034] A configuration information receiving module is configured to receive random access configuration information issued by a base station; wherein the random access configuration information comprises a reception power judgment threshold;

[0035] A transmission node determining module is configured to determine a target transmission node according to a size relationship between a reception power of a target SSB reference signal and the reception power judgment threshold when initiating random access; wherein the target transmission node is a base station or a preset uplink transmission node;

[0036] A random access module is configured to complete a random access process through the target transmission node.

[0037] The embodiment of the present disclosure further provides another random access device applied to a base station side, the device comprising:

[0038] A configuration information determining module is configured to determine random access configuration information; wherein the random access configuration information comprises a reception power judgment threshold;

[0039] A configuration information issuing module is configured to issue random access configuration information to a terminal, so that the terminal determines a target transmission node according to a size relationship between a reception power of a target SSB reference signal and the reception power judgment threshold when initiating random access, and completes a random access process through the target transmission node; wherein the target transmission node is a base station or a preset uplink transmission node.

[0040] The embodiment of the present disclosure further provides a random access device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the random access method according to any one of the above embodiments when executing the computer program.

[0041] The embodiment of the present disclosure further provides a computer readable storage medium comprising a stored computer program, wherein the computer readable storage medium controls a device where the computer readable storage medium is located to execute the random access method according to any one of the above embodiments when the computer program runs.

[0042] The embodiment of the present disclosure further provides a computer program product, which comprises a computer program or computer instructions, and the computer program or the computer instructions are executed by a processor to realize the random access method according to any one of the above. BRIEF DESCRIPTION OF DRAWINGS

[0043] Fig. 1 is a flow diagram of a random access method according to an embodiment of the present disclosure;

[0044] Fig. 2 is a schematic diagram of an UL-only deployment scenario according to an embodiment of the present disclosure;

[0045] Fig. 3 is a schematic diagram of a partition of a macro base station coverage according to an embodiment of the present disclosure;

[0046] Fig. 4 is a schematic diagram of a mapping relationship between an SSB reference signal and a random access channel occasion RO according to an embodiment of the present disclosure;

[0047] Fig. 5 is a schematic diagram of a mapping relationship between an SSB reference signal, a transmission node and a random access preamble according to an embodiment of the present disclosure;

[0048] Fig. 6 is a schematic diagram of a principle of random access according to an embodiment of the present disclosure;

[0049] Fig. 7 is a flow diagram of another random access method according to an embodiment of the present disclosure;

[0050] Fig. 8 is a schematic diagram of a structure of a random access device according to an embodiment of the present disclosure;

[0051] Fig. 9 is a schematic diagram of a structure of another random access device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present disclosure.

[0053] In the description of the present disclosure, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the present disclosure and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0054] The terms "first", "second", "third", etc. are used only for descriptive purposes and do not imply or suggest a relative importance or an implicit indication of the number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0055] Referring to FIG. 1, it is a flowchart of a random access method provided by an embodiment of the present disclosure. An embodiment of the present disclosure provides a random access method applied to a terminal side, which includes operations S11 to S13:

[0056] S11, receiving random access configuration information issued by a base station; wherein the random access configuration information includes a reception power judgment threshold;

[0057] S12, when initiating random access, determining a target transmission node according to the size relationship between the reception power of a target SSB reference signal and the reception power judgment threshold; wherein the target transmission node is a base station or a preset uplink transmission node;

[0058] S13, completing the random access process through the target transmission node.

[0059] It should be noted that the embodiment of the present disclosure can be applied to a scenario where a preset uplink transmission node is deployed. Optionally, the preset uplink transmission node is an UL-only node. Referring to FIG. 2, it is a schematic diagram of an UL-only deployment scenario in an embodiment of the present disclosure. A cell network includes a macro base station, a terminal, and an UL-only node. The UL-only node is used to assist in enhancing the uplink transmission of the terminal. The terminal can select to transmit signals to the UL-only node in the uplink, and then transmit the signals to the macro base station through the UL-only node.

[0060] To solve the problem that, under the existing random access mechanism, the terminal only interacts with the macro base station, cannot determine whether it is necessary to access through the UL-only node, and leads to low random access efficiency and resource waste of cell edge user terminals, in an embodiment of the present disclosure, referring to FIG. 3, it is a partitioning diagram of the coverage range of a macro base station in an embodiment of the present disclosure. In order to support the cell edge user terminal to complete random access through the preset uplink transmission node, the macro base station partitions the coverage range of the macro base station according to the network radius or path loss, determines a reception power judgment threshold, which is used to represent the size of the SSB reference signal reception power and indirectly represents the distance between the terminal and the macro base station, and serves as random access configuration information. The macro base station issues the completed random access configuration information to the terminal side.

[0061] In some embodiments, the base station carries the random access configuration information through a system information block 1 (SIB1) and delivers the information to the terminal.

[0062] When the terminal initiates random access in a cell network, the terminal measures and selects an optimal SSB reference signal as a target SSB reference signal, compares the received power of the selected target SSB reference signal with a received power judgment threshold set in the random access configuration information, and selects a target transmission node to initiate random access according to the comparison result, i.e., selects to initiate random access to a base station or to the preset uplink transmission node (UL-only node).

[0063] In some embodiments, operation S12, i.e., determining a target transmission node according to the size relationship between the received power of the target SSB reference signal and the received power judgment threshold, includes:

[0064] S121, when the received power of the target SSB reference signal is less than or equal to the received power judgment threshold, determining the uplink transmission node as the target transmission node;

[0065] S122, when the received power of the target SSB reference signal is greater than the received power judgment threshold, determining the base station as the target transmission node.

[0066] Specifically, when the received power of the target SSB reference signal selected by the terminal is less than or equal to the received power judgment threshold, it indicates that the terminal is far away from the macro base station and is a cell edge user terminal, and therefore directly initiates random access through the uplink transmission node (UL-only node) and establishes a connection with the macro base station through the uplink transmission node (UL-only node). Subsequently, the data uplink transmission process between the terminal and the base station needs to establish a connection with the uplink transmission node (UL-only node). When the received power of the target SSB reference signal selected by the terminal is greater than the received power judgment threshold, it indicates that the terminal is close to the macro base station, and therefore directly initiates random access to the macro base station.

[0067] By means of the technical solution of the embodiment of the present disclosure, the random access configuration information including the reception power judgment threshold is configured by the base station side and is issued to the terminal side, the target transmission node is selected by the terminal side according to the size relationship between the reception power of the target SSB reference signal and the reception power judgment threshold, the terminal is assisted to judge whether it is necessary to initiate random access through the UL-only node, which is beneficial to the cell edge user terminal to quickly select the uplink transmission node to complete the random access process, and the situation that the uplink throughput of the cell edge user is significantly reduced due to the fact that the terminal cannot judge whether it is necessary to access through the UL-only node under the existing random access mechanism, the cell edge user terminal undergoes multiple uplink transmission failures after entering the connected state, and then is configured by the macro base station to switch to the UL-only node to bear the uplink transmission is avoided, and the random access efficiency of the terminal and the resource utilization rate are effectively improved.

[0068] The embodiment of the present disclosure is further implemented on the basis of the above-mentioned embodiment, the random access configuration information further includes a preset mapping relationship of the SSB reference signal, the transmission node, the random access resource and the random access preamble; then operation S13, that is, the random access process is completed through the target transmission node, includes:

[0069] S131, according to the mapping relationship, selecting the target SSB reference signal, the target random access resource corresponding to the target transmission node and the target random access preamble;

[0070] S132, sending the target random access preamble by using the target random access resource, and establishing a connection with the target transmission node.

[0071] In the embodiment of the present disclosure, the base station further pre-establishes the mapping relationship of the SSB reference signal, the transmission node, the random access resource and the random access preamble, and issues it to the terminal as the random access configuration information, when the terminal initiates random access, determines whether to use the base station or the uplink transmission node UL-only node as the target transmission node according to the reception power of the target SSB reference signal, and according to the serial number of the target SSB reference signal and the target transmission node, finds the mapping relationship to determine the corresponding target random access resource and target random access preamble preamble, transmits the target random access preamble preamble by using the target random access resource, and initiates random access. The terminal can implicitly notify the macro base station or notify the UL-only node and the macro base station via the UL-only node about the selection result of the target transmission node through the selection mode of the target random access resource and / or the target random access preamble preamble, and continue to complete the subsequent random access process.

[0072] In some embodiments, the base station establishes a mapping relationship between the SSB reference signal, the transmission node, the random access resource and the random access preamble in a two-grouping manner according to a preset joint mapping relationship between the SSB reference signal, the random access resource and the random access preamble; and the transmission node is a base station or a preset uplink transmission node.

[0073] In some embodiments, the target random access resource includes a random access channel occasion (RO).

[0074] Specifically, the base station further divides the RO and / or preamble resource group corresponding to each SSB sequence number into two subgroups according to the relative relationship between the SSB receiving power and the receiving power judgment threshold, respectively corresponding to the case of accessing through the base station and the case of accessing through the uplink transmission node UL-only, thereby establishing a joint mapping relationship between the SSB sequence number, the SSB receiving power and the preamble / RO resource, and issuing the random access configuration information to the terminal. When the terminal initiates random access, after selecting the target SSB reference signal, the preamble and the RO resource are selected according to the joint mapping of the SSB sequence number and the SSB receiving power to initiate random access. If the downlink receiving power of the SSB of a certain terminal is less than or equal to the receiving power judgment threshold, the terminal selects the RO resource in the RO / preamble subgroup of the UL-only node corresponding to the SSB for transmitting the preamble. If the downlink receiving power of the SSB of a certain terminal is greater than the receiving power judgment threshold, the terminal selects the RO resource in the RO / preamble subgroup of the macro base station corresponding to the SSB for transmitting the preamble, thereby implicitly informing the macro base station whether to complete the uplink access via the uplink transmission node UL-only node.

[0075] It should be noted that the mapping relationship between the SSB reference signal and the RO includes a one-to-many, one-to-one or many-to-one relationship, and the mapping relationship between the SSB reference signal and the RO is usually a one-to-many relationship. Regardless of the case, the RO and / or preamble resource group corresponding to the SSB sequence number can be divided into two subgroups by a two-grouping manner to respectively correspond to the case of accessing through the base station or the uplink transmission node.

[0076] As an example, assuming that the received power judgment threshold is -60dbm, and ssb-perRACH-OccasionAndCB-preamblesPerSSB = 1 / 2 & 64, MSG1-FDM = 2, wherein the values of ssb-perRACH-Occasion and CB-preamblesPerSSB are 1 / 2 and 64 respectively represent that the mapping relationship between the current SSB and RO / preamble is one-to-many, each SSB corresponds to two ROs, and 64 preambles can be used for contention-based random access on each RO, combined with the value of MSG1-FDM being 2, a schematic diagram as shown in FIG. 4 can be formed. FIG. 4 is a schematic diagram of the mapping relationship between the SSB reference signal and the RO in the embodiment of the present disclosure.

[0077] Considering that the cell is a special cell with UL-only nodes, the RO / preambles are secondarily grouped, respectively corresponding to the access through the macro base station and the uplink transmission node UL-only node. Since the mapping relationship between the initial SSB and the RO / preamble is one-to-many, only the RO needs to be secondarily grouped, forming the mapping relationship between the SSB reference signal, the transmission node and the random access preamble. Referring to FIG. 5, which is a schematic diagram of the mapping relationship between the SSB reference signal, the transmission node and the random access preamble in the embodiment of the present disclosure, wherein RO0 corresponding to SSB0 is configured as the access through the macro base station (normal case), RO1 corresponding to SSB0 is configured as the access through the uplink transmission node UL-only node, and the configurations of SSB1 to SSB5 are similar.

[0078] Further, when a certain terminal initiates random access in the cell, it is found after measurement that SSB3 is the optimal SSB, but the received power RSRP of SSB3 is only -78dbm, which is less than the judgment threshold of -60dbm. Therefore, the terminal uses the RO7 corresponding to the UL-only node as the time-frequency resource for random access, which is used for transmitting the preamble to the UL-only node instead of the macro base station. The UL-only node corresponding to SSB3 retrieves the preamble sent by the terminal on RO7, and knows that the terminal is a cell edge user. Whether it is a random access process or a subsequent data transmission process, the uplink transmission needs to establish a connection with the UL-only node.

[0079] It can be understood that if the mapping relationship between the SSB and the RO is one-to-one or many-to-one, the access through the base station or the uplink transmission node is represented by secondarily grouping the multiple preambles corresponding to the RO, forming the mapping relationship between the SSB reference signal, the transmission node and the random access preamble, which is not described herein.

[0080] By adopting the technical means of the embodiments of the present disclosure, when the macro base station issues random access basic configuration information, the macro base station coverage range is partitioned according to radius / path loss to determine the reception power judgment threshold, and a joint mapping relationship between the SSB serial number, the SSB reception power and the preamble / RO resource is established, so that when the terminal initiates random access, the preamble and the RO resource are selected according to the joint mapping of the SSB serial number and the SSB reception power, which are used to send random access resources, and implicitly inform the macro base station whether to complete uplink access via the UL-only node, thereby effectively improving the random access efficiency.

[0081] The embodiments of the present disclosure are further implemented on the basis of any of the above embodiments, and the method further comprises:

[0082] When the target transmission node is the base station, the first transmission power is used to send the random access resource in the random access process.

[0083] When the target transmission node is the uplink transmission node, the second transmission power is used to send the random access resource in the random access process; wherein the second transmission power is the difference between the first transmission power and a preset power offset.

[0084] In the embodiments of the present disclosure, the transmission power of the random access resource PRACH sent by the macro base station or by the UL-only node is different, when the terminal selects the macro base station to initiate random access, the transmission power control of the PRACH can refer to the related prior art means, only considering the path loss between the macro base station and the terminal.

[0085] When the terminal selects the UL-only node to initiate random access, if the path loss is calculated according to the reception power RSRP of the terminal side after the macro base station sends the SSB, the PRACH transmission power of the user accessing through the UL-only node is obviously too large, therefore in the embodiments of the present disclosure, the PRACH transmission power should be reduced by a preset power offset compared with the PRACH transmission power when the random access is initiated through the macro base station, thereby facilitating the energy saving effect of the terminal and avoiding interference to the adjacent area.

[0086] In some embodiments, the maximum value of the preset power offset is the transmission power calculated according to the path loss between the uplink transmission node and the terminal.

[0087] In some embodiments, the random access configuration information further comprises the path loss between the base station and the uplink transmission node, denoted as the first path loss.

[0088] Then the terminal calculates the path loss between the uplink transmission node and the terminal by the following operations:

[0089] Based on the received power of the target SSB reference signal, the path loss between the base station and the terminal is calculated and denoted as the second path loss;

[0090] The path loss between the uplink transmission node and the terminal is calculated based on the difference between the second path loss and the first path loss.

[0091] In this embodiment of the disclosure, the terminal calculates the second path loss between the macro base station and the terminal based on the downlink SSB received power, and then subtracts it from the first path loss between the base station and the uplink transmission node contained in the random access configuration information sent by the base station to obtain the path loss between the uplink transmission node and the terminal. This path loss is used to determine the preset power offset, which is used to assist in the calculation of the transmission power of the random access resource PRACH.

[0092] Specifically, before initiating random access, the random access configuration information sent by the base station through SIB1 includes the following parameters: preambleReceivedTargetPower (expected received strength), DELTA_Preamble (offset corresponding to different preamble formats), PreamblePowerRampingCounter (number of preamble transmissions), and PreamblePowerRampingStep (preamble transmission power ramp-up step size). The calculation method for the PRACH transmission power (i.e., the first transmission power) when initiating random access through the macro base station is: P PRACH.1 =preambleReceivedTargetPower+DELTA_Preamble +(PreamblePowerRampingCounter-1)*PreamblepowerRampingStep+(SS_PBCH_BlockPower-RSRP);

[0093] The calculation method for the PRACH transmission power (i.e., the second transmission power) when initiating random access through an uplink transmission node UL-only node is as follows: P PRACH.2 P PRACH.1 -SSB_UL_TRP_power_loss =preambleReceivedTargetPower+DELTA_Preamble+(PreamblePowerRampingCounter-1)*PreamblepowerRampingSlep+(SS_PBCH_BlockPower-RSRP)-SSB_UL_TRP_power_loss;

[0094] Wherein, SS-PBCH-BlockPower represents the transmission power of SSB reference signal, RSRP represents the reception power of SSB reference signal, and SSB_UL_TRP_power_loss is a preset power offset.

[0095] As an example, referring to FIG. 6, which is a schematic diagram of the principle of random access in the embodiment of the present disclosure, wherein the SSB transmission power is SS-PBCH-BlockPower = -8dbm, and -60dbm is the reception power judgment threshold for whether to use the UL-only node to initiate uplink access.

[0096] Before initiating random access, the base station transmits the random access configuration information through SIB1, which at least includes the following contents:

[0097] ssb-perRACH-OccasionAndCB-preamblesPerSSB = 1 / 2 & 64;

[0098] MSG1-FDM = 2;

[0099] preambleReceivedTargetPower = -100;

[0100] DELTA_Preamble = 0;

[0101] PreamblePowerRampingCounter = 1;

[0102] PreamblepowerRampingStep = 4;

[0103] The base station establishes the mapping relationship of SSB reference signal, transmission node, random access resource and random access preamble according to ssb-perRACH-OccasionAndCB-preamblesPerSSB and MSG1-FDM, and the specific process is referred to the above embodiment, which is not repeated here.

[0104] A certain terminal initiates random access in the cell, and finds that SSB3 is the optimal SSB after measurement, but the RSRP of SSB reception is only -78dbm, which is less than the judgment threshold of -60dbm. Therefore, the terminal uses RO7 as the time-frequency resource of random access, which is used to transmit preamble to the UL-only node instead of the macro base station. The UL-only node corresponding to SSB3 retrieves the preamble sent by the terminal on RO7, and can know that the terminal is a cell edge user, and the uplink transmission needs to establish connection with the UL-only node in the random access process and the subsequent data transmission process.

[0105] And, the terminal calculates the second path loss between the macro base station and the terminal according to the downlink SSB received power, and the first path loss between the base station and the uplink transmission node issued by the base station, and approximately calculates the path loss between the uplink transmission node and the terminal by subtraction, and determines the power offset SSB_UL_TRP_power_loss=32.

[0106] For the PRACH transmission power of the terminal, the following formula is used for calculation: P PRACH.2 = preambleReceivedTargetPower+DELTA_Preamble +(PreamblePowerRampingCounter-1)*PreamblepowerRampingStep+(SS_PBCH_BlockPower-RSRP)-SSB_UL_TRP_power_loss=-100+0+(1-1)*4+(-8-(-78))-32=-62dbm.

[0107] It should be noted that since the UL-only node is very likely not located on the transmission path of the macro base station to the cell edge user, the path loss from the terminal to the UL-only node is very likely not equal to the path loss from the macro base station to the terminal minus the path loss from the macro base station to the UL-only node. When random access is initiated through the UL-only node, the PRACH transmission power calculated by the above formula is still slightly larger than the PRACH transmission power calculated according to the actual path loss from the terminal to the UL-only node. However, considering that the random access process is the first step for the terminal to establish a connection with the network, at this time, the real path loss from the terminal to the UL-only node cannot be accurately obtained, and the approximate calculation method in the above formula can be used for coarse power control of the terminal initiating random access through the UL-only node, which is still obviously helpful for terminal energy saving and reducing interference to neighboring cells.

[0108] In addition, DELTA_Preamble in the existing PRACH transmission power calculation formula represents the offset of different preamble formats. Although this parameter is also a power offset, this parameter is only related to the preamble format and the subcarrier spacing. The newly added SSB_UL_TRP_power_loss power offset in the embodiment of the present disclosure represents the path loss difference and is mainly related to large-scale fading and directly related to the propagation distance, so the function of the newly added SSB_UL_TRP_power_loss parameter in the embodiment of the present disclosure cannot be replaced by the DELTA_Preamble parameter in the existing protocol.

[0109] The technical means of the embodiment of the present disclosure considers the path loss between the terminal and the uplink transmission node. When the terminal accesses through the UL-only node, the preamble transmission power does not need to be transmitted to the macro base station for PRACH. A preset power offset is added to compensate for the difference in PRACH transmission power when accessing through the UL-only node compared with accessing through the macro base station, which helps to achieve terminal energy saving and avoid interference to the adjacent area. For non-cell edge users, the newly added several parameters in the random access configuration information issued by the base station do not affect the access process, and backward compatibility is achieved.

[0110] Referring to FIG. 7, it is a flow diagram of another random access method provided by the embodiment of the present disclosure. The embodiment of the present disclosure provides another random access method, which is applied to the base station side. The method comprises operations S21 to S22:

[0111] S21, determining random access configuration information; wherein the random access configuration information comprises a reception power judgment threshold;

[0112] S22, issuing the random access configuration information to the terminal, so that the terminal determines a target transmission node according to the size relationship between the reception power of the target SSB reference signal and the reception power judgment threshold when initiating random access, and completes the random access process through the target transmission node; wherein the target transmission node is a base station or a preset uplink transmission node.

[0113] In some embodiments, the random access configuration information further comprises a mapping relationship among the preset SSB reference signal, the transmission node, the random access resource and the random access preamble;

[0114] Then the terminal can select the target SSB reference signal, the target random access resource corresponding to the target transmission node and the target random access preamble according to the mapping relationship; and transmit the target random access preamble using the target random access resource to establish a connection with the target transmission node.

[0115] In some embodiments, determining the mapping relationship among the preset SSB reference signal, the transmission node, the random access resource and the random access preamble comprises:

[0116] According to the joint mapping relationship among the preset SSB reference signal, the random access resource and the random access preamble, the mapping relationship among the SSB reference signal, the transmission node, the random access resource and the random access preamble is established in a two-grouping manner; and the transmission node is a base station or a preset uplink transmission node.

[0117] It should be noted that the random access method applied to the base station side provided by the embodiments of the present disclosure corresponds to all the process operations of the random access method applied to the terminal side in the above embodiments one by one, and the working principles and beneficial effects of the two are the same, so they will not be repeated.

[0118] By adopting the technical means of the embodiments of the present disclosure, the random access configuration information including the reception power judgment threshold is configured by the base station side and issued to the terminal side, and the terminal side selects the target transmission node according to the size relationship between the reception power of the target SSB reference signal and the reception power judgment threshold, which helps the terminal to judge whether it is necessary to initiate random access through the UL-only node, is conducive to the cell edge user terminal to quickly select the uplink transmission node to complete the random access process, and avoids the situation that the terminal cannot judge whether it is necessary to access through the UL-only node under the existing random access mechanism, and the cell edge user terminal is configured by the macro base station to switch to the UL-only node to bear the uplink transmission after entering the connected state and experiencing multiple uplink transmission failures, resulting in a significant decrease in the uplink throughput of the cell edge user. The random access efficiency of the terminal and the utilization rate of resources are effectively improved.

[0119] Referring to FIG. 8, it is a structural schematic diagram of a random access device provided by the embodiments of the present disclosure, the embodiments of the present disclosure provide a random access device 30 applied to the terminal side, the device 30 comprises:

[0120] The configuration information receiving module 31 is configured to receive the random access configuration information issued by the base station; wherein the random access configuration information comprises a reception power judgment threshold;

[0121] The transmission node determining module 32 is configured to determine a target transmission node according to the size relationship between the reception power of the target SSB reference signal and the reception power judgment threshold when initiating random access; wherein the target transmission node is a base station or a preset uplink transmission node;

[0122] The random access module 33 is configured to complete the random access process through the target transmission node.

[0123] It should be noted that the random access device provided by the embodiments of the present disclosure is used to perform all the process operations of the random access method applied to the terminal side in the above embodiments, and the working principles and beneficial effects of the two are one-to-one correspondence, so they will not be repeated.

[0124] Referring to FIG. 9, it is a structural schematic diagram of another random access device provided by the embodiments of the present disclosure, the embodiments of the present disclosure provide a random access device 40 applied to the base station side, the device 40 comprises:

[0125] The configuration information determination module 41 is configured to determine random access configuration information, wherein the random access configuration information comprises a reception power judgment threshold.

[0126] The configuration information issuing module 42 is configured to issue the random access configuration information to a terminal, so that the terminal determines a target transmission node according to a size relationship between a reception power of a target SSB reference signal and the reception power judgment threshold when initiating random access, and completes a random access process through the target transmission node, wherein the target transmission node is a base station or a preset uplink transmission node.

[0127] It should be noted that the random access device provided in the embodiments of the present disclosure is used to perform all process operations of the random access method applied to the base station side in the above-mentioned embodiments, and the working principles and beneficial effects of the two are one-to-one corresponding, and thus will not be described in detail.

[0128] The embodiments of the present disclosure further provide a random access device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the random access method according to any one of the above-mentioned embodiments when executing the computer program.

[0129] The embodiments of the present disclosure further provide a computer readable storage medium, comprising a stored computer program, wherein the computer readable storage medium performs the random access method according to any one of the above-mentioned embodiments when the computer program runs.

[0130] The embodiments of the present disclosure further provide a computer program product, comprising a computer program or computer instructions, wherein the computer program or the computer instructions implement the random access method according to any one of the above-mentioned embodiments when executed by a processor.

[0131] Those skilled in the art can understand that all or part of the processes of the above-mentioned embodiments can be completed by a computer program instructing related hardware, and the program can be stored in a computer readable storage medium, and the program can include the processes of the above-mentioned embodiments when executed.

[0132] The above-mentioned is some embodiments of the present disclosure, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present disclosure, and these improvements and refinements are also regarded as the protection scope of the present disclosure.

Claims

1. A random access method wherein, Applied to the terminal side, the method comprises: Receiving random access configuration information issued by the base station; wherein the random access configuration information comprises a reception power judgment threshold; When initiating random access, determining a target transmission node according to the size relationship between the reception power of the target SSB reference signal and the reception power judgment threshold; wherein the target transmission node is the base station or a preset uplink transmission node; Completing the random access process through the target transmission node.

2. The random access method of claim 1, wherein, The determination of the target transmission node according to the size relationship between the reception power of the target SSB reference signal and the reception power judgment threshold comprises: When the reception power of the target SSB reference signal is less than or equal to the reception power judgment threshold, determining that the uplink transmission node is the target transmission node; When the reception power of the target SSB reference signal is greater than the reception power judgment threshold, determining that the base station is the target transmission node.

3. The random access method of claim 2, wherein, The random access configuration information further comprises a preset mapping relationship between SSB reference signals, transmission nodes, random access resources and random access preambles; Then, the completion of the random access process through the target transmission node comprises: According to the mapping relationship, selecting the target SSB reference signal, the target random access resource corresponding to the target transmission node and the target random access preamble; Sending the target random access preamble using the target random access resource to establish a connection with the target transmission node.

4. The random access method according to any one of claims 1 to 3, wherein, The method further comprises: When the target transmission node is the base station, sending a random access resource using a first transmission power during the random access process; When the target transmission node is the uplink transmission node, sending the random access resource using a second transmission power during the random access process; wherein the second transmission power is the difference between the first transmission power and a preset power offset.

5. The random access method of claim 4, wherein, The maximum value of the preset power offset is the transmission power calculated according to the path loss between the uplink transmission node and the terminal.

6. The random access method of claim 5, wherein, The random access configuration information further comprises the path loss between the base station and the uplink transmission node, denoted as the first path loss; Then, the path loss between the uplink transmission node and the terminal is calculated by: According to the reception power of the target SSB reference signal, calculating the path loss between the base station and the terminal, denoted as the second path loss; According to the difference between the second path loss and the first path loss, calculating the path loss between the uplink transmission node and the terminal.

7. A random access method in which, Applied to the base station side, the method comprises: Determining random access configuration information; wherein the random access configuration information comprises a reception power judgment threshold; Issuing random access configuration information to the terminal, so that the terminal, when initiating random access, determines a target transmission node according to the size relationship between the reception power of a target SSB reference signal and the reception power judgment threshold, and completes the random access process through the target transmission node; wherein the target transmission node is the base station or a preset uplink transmission node.

8. The random access method of claim 7, wherein, The random access configuration information further comprises a preset mapping relationship among SSB reference signals, transmission nodes, random access resources and random access preambles. The terminal can select target SSB reference signals, target random access resources corresponding to the target transmission nodes and target random access preambles according to the mapping relationship, transmit the target random access preambles by using the target random access resources, and establish a connection with the target transmission nodes.

9. The random access method according to claim 8, wherein, The mapping relationship among the preset SSB reference signals, the transmission nodes, the random access resources and the random access preambles comprises: The mapping relationship among the SSB reference signals, the transmission nodes, the random access resources and the random access preambles is established by using a secondary grouping manner according to a joint mapping relationship among the preset SSB reference signals, the random access resources and the random access preambles; and the transmission nodes are the base station or the preset uplink transmission nodes.

10. The random access method of claim 7, wherein, The determination of the random access configuration information comprises: The coverage range of the base station is partitioned according to a network radius or path loss, and the reception power judgment threshold is determined.

11. A random access apparatus, wherein, The device applied to the terminal side comprises: A configuration information receiving module is configured to receive random access configuration information issued by a base station; wherein the random access configuration information comprises a reception power judgment threshold; A transmission node determining module is configured to determine a target transmission node according to a size relationship between the reception power of a target SSB reference signal and the reception power judgment threshold when initiating random access; wherein the target transmission node is the base station or a preset uplink transmission node; A random access module is configured to complete a random access process by using the target transmission node.

12. The random access apparatus of claim 11, wherein, The transmission node determining module is configured to: When the reception power of the target SSB reference signal is less than or equal to the reception power judgment threshold, the uplink transmission node is determined as the target transmission node; When the reception power of the target SSB reference signal is greater than the reception power judgment threshold, the base station is determined as the target transmission node.

13. The random access apparatus of claim 12, wherein, The random access configuration information further comprises a preset mapping relationship among SSB reference signals, transmission nodes, random access resources and random access preambles; The random access module is configured to: select target SSB reference signals, target random access resources corresponding to the target transmission nodes and target random access preambles according to the mapping relationship; and transmit the target random access preambles by using the target random access resources, and establish a connection with the target transmission nodes.

14. The random access apparatus of any one of claims 11-13, wherein, The random access module is configured to: when the target transmission node is the base station, transmit random access resources by using a first transmission power in the random access process; when the target transmission node is the uplink transmission node, transmit the random access resources by using a second transmission power in the random access process; wherein the second transmission power is a difference between the first transmission power and a preset power offset.

15. The random access apparatus of claim 14, wherein, The maximum value of the preset power offset is a transmission power calculated according to path loss between the uplink transmission node and the terminal.

16. A random access apparatus, wherein, Applied to the base station side, the device comprises: A configuration information determination module is configured to determine random access configuration information, wherein the random access configuration information comprises a reception power judgment threshold; A configuration information issuing module is configured to issue the random access configuration information to a terminal, so that the terminal determines a target transmission node according to a size relationship between a reception power of a target SSB reference signal and the reception power judgment threshold when initiating random access, and completes a random access process through the target transmission node; wherein the target transmission node is the base station or a preset uplink transmission node.

17. The random access apparatus of claim 16, wherein, The random access configuration information further comprises a mapping relationship among preset SSB reference signals, transmission nodes, random access resources and random access preambles. The terminal can select a target SSB reference signal, a target random access resource corresponding to the target transmission node and a target random access preamble according to the mapping relationship, transmit the target random access preamble using the target random access resource, and establish a connection with the target transmission node.

18. A random access device, wherein, A computer program stored in the memory and configured to be executed by the processor, when the processor executes the computer program, implements the random access method according to any one of claims 1 to 10.

19. A computer readable storage medium, wherein, The computer readable storage medium comprises a stored computer program, wherein when the computer program runs, the device where the computer readable storage medium is located executes the random access method according to any one of claims 1 to 10.

20. A computer program product, wherein, The computer program product comprises a computer program or computer instructions, when the computer program or the computer instructions are executed by a processor, the random access method according to any one of claims 1 to 10 is implemented.

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