Random access method and apparatus, and related device and storage medium

Abstract

Disclosed in the present disclosure are a random access method and apparatus, and a related device and a storage medium. The method is applied to a source cell, and comprises: sending handover request information to one or more candidate cells, wherein the handover request information comprises random access indication information; receiving pre-configuration information sent by the one or more candidate cells, wherein the pre-configuration information comprises physical random access channel (PRACH) information corresponding to each candidate cell; and when a target cell to which a user equipment hands over is selected from the one or more candidate cells, sending instruction information to the user equipment, wherein the instruction information comprises identification information of the target cell, the random access indication information, and PRACH information of the target cell, the instruction information being used for instructing the user equipment to send the PRACH information of the target cell to the target cell, and the PRACH information of the target cell being used for notifying the target cell that the user equipment has randomly accessed the target cell.

Description

Random access method and device, related equipment and storage medium

[0001] Cross-reference to related applications

[0002] The present application is based on and claims priority to Chinese patent application No. 202410823096.5, filed on June 24, 2024, the entire contents of which are hereby incorporated by reference into the present application. TECHNICAL FIELD

[0003] Embodiments of the present disclosure relate to the field of communication, and in particular to a random access method, device, related equipment and storage medium. BACKGROUND

[0004] One important process in wireless communication system is cell handover, in order to guarantee the reliability and low latency of cell handover, in existing communication standards, there are multiple cell handover enhancement schemes, such as conditional handover (CHO) scheme, L1 / L2 triggered mobility (LTM) handover scheme, etc. The current cell handover scheme needs to obtain dedicated PRACH resources from the target cell of the target distributed unit (DU) through the physical random access channel (PRACH), and the acquisition process involves multiple cells, multiple interfaces, and large latency; and then multiple target cells use the acquired PRACH resources for PRACH detection, which may have PRACH false detection and false detection, resulting in incorrect time advanced (TA) calculation. SUMMARY

[0005] To solve the above technical problems, the embodiments of the present disclosure provide a random access method, device, related equipment and storage medium.

[0006] In a first aspect, the embodiments of the present disclosure provide a random access method applied to a source cell, the method comprising: sending handover request information to one or more candidate cells; the handover request information comprising random access indication information; receiving pre-configuration information sent by the one or more candidate cells; the pre-configuration information comprising PRACH information corresponding to each candidate cell; in the case of selecting a target cell to which a user equipment is handed over from the one or more candidate cells, sending indication information to the user equipment; the indication information comprising identification information of the target cell, the random access indication information and PRACH information of the target cell; the indication information being used to instruct the user equipment to send the PRACH information of the target cell to the target cell, and the PRACH information of the target cell being used to inform the target cell that the user equipment has randomly accessed to the target cell.

[0007] In a second aspect, the embodiments of the present disclosure provide a random access method applied to a target cell, the method comprising: receiving handover request information sent by a source cell; the handover request information comprising random access indication information; sending pre-configuration information to the source cell; the pre-configuration information comprising PRACH information of the target cell; the PRACH information of the target cell being used for the source cell to send indication information to user equipment in the case of selecting the target cell as a cell to which the user equipment is handed over; the indication information comprising identification information of the target cell, the random access indication information and the PRACH information of the target cell; in the case of receiving the PRACH information of the target cell sent by the user equipment, confirming that the user equipment accesses successfully.

[0008] In a third aspect, the embodiments of the present disclosure provide a random access method applied to user equipment, the method comprising: receiving indication information sent by a source cell; the indication information comprising identification information of a target cell, random access indication information and PRACH information of the target cell; sending the PRACH information of the target cell to the target cell; the PRACH information of the target cell being used to inform the target cell that the user equipment has randomly accessed to the target cell.

[0009] In a fourth aspect, the embodiments of the present disclosure provide a random access apparatus applied to a source cell, comprising: a first sending unit configured to send handover request information to one or more candidate cells; the handover request information comprising random access indication information; a first receiving unit configured to receive pre-configuration information sent by the one or more candidate cells; the pre-configuration information comprising physical random access channel (PRACH) information corresponding to each candidate cell; a second sending unit configured to, in the case that a target cell to which a user equipment is switched is selected from the one or more candidate cells, send indication information to the user equipment; the indication information comprising identification information of the target cell, the random access indication information and PRACH information of the target cell; and the indication information is used to instruct the user equipment to send the PRACH information of the target cell to the target cell, and the PRACH information of the target cell is used to inform the target cell that the user equipment has randomly accessed to the target cell.

[0010] In a fifth aspect, the embodiments of the present disclosure provide a random access apparatus applied to a target cell, comprising: a second receiving unit configured to receive handover request information sent by a source cell; the handover request information comprising random access indication information; a third sending unit configured to send pre-configuration information to the source cell; the pre-configuration information comprising PRACH information of the target cell; the PRACH information of the target cell is used for the source cell to, in the case that the target cell is selected as a cell to which a user equipment is switched, send indication information to the user equipment; the indication information comprising identification information of the target cell, the random access indication information and the PRACH information of the target cell; and a confirming unit configured to, in the case that the PRACH information of the target cell sent by the user equipment is received, confirm that the user equipment has accessed successfully.

[0011] In a sixth aspect, the embodiments of the present disclosure provide a random access apparatus applied to a user equipment, comprising: a third receiving unit configured to receive indication information sent by a source cell; the indication information comprising identification information of a target cell, random access indication information and PRACH information of the target cell; and a fourth sending unit configured to send the PRACH information of the target cell to the target cell; the PRACH information of the target cell is used to inform the target cell that the user equipment has randomly accessed to the target cell.

[0012] In a seventh aspect, the embodiments of the present disclosure provide an electronic device, comprising a memory and a processor, wherein the memory stores computer executable instructions, and the processor executes the computer executable instructions stored in the memory, so as to implement the method of the first aspect, or implement the method of the second aspect, or implement the method of the third aspect.

[0013] In an eighth aspect, a computer storage medium is provided, and the computer storage medium stores a computer program. The computer program is executed by a processor to implement the method in the first aspect, or to implement the method in the second aspect, or to implement the method in the third aspect.

[0014] In a ninth aspect, a computer program product is provided, and the computer program product includes a computer program. The computer program is executed by a processor to implement the method in the first aspect, or to implement the method in the second aspect, or to implement the method in the third aspect.

[0015] The technical solution of the embodiments of the present disclosure adds random access indication information in the handover request message, so as to indicate that the PRACH message is used to indicate the cell handover success between the target cell and the user equipment, simplify the cell handover process, reduce the data delay, and improve the cell handover success rate. BRIEF DESCRIPTION OF DRAWINGS

[0016] FIG. 1 is a schematic diagram of a framework involved in cell handover;

[0017] FIG. 2 is a schematic diagram of a cell handover process;

[0018] FIG. 3 is a schematic diagram of a random access method according to an embodiment of the present disclosure;

[0019] FIG. 4 is a schematic diagram of a random access method according to an embodiment of the present disclosure;

[0020] FIG. 5 is a schematic diagram of a random access method according to an embodiment of the present disclosure;

[0021] FIG. 6 is a schematic diagram of a random access method according to an embodiment of the present disclosure;

[0022] FIG. 7 is a schematic diagram of a random access method according to an embodiment of the present disclosure;

[0023] FIG. 8 is a schematic diagram of a random access method according to an embodiment of the present disclosure;

[0024] FIG. 9 is a schematic diagram of a random access process according to an embodiment of the present disclosure;

[0025] FIG. 10 is a schematic diagram of a structure of a random access device according to an embodiment of the present disclosure;

[0026] FIG. 11 is a schematic diagram of a structure of a random access device according to an embodiment of the present disclosure;

[0027] FIG. 12 is a schematic diagram of a structure of a random access device according to an embodiment of the present disclosure;

[0028] FIG. 13 is a schematic diagram of a structure of an electronic device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the following will be combined with the accompanying drawings for the embodiments of the present disclosure to clearly and completely describe the technical solutions of the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The components of the embodiments of the present disclosure described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed present disclosure, but only represents selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present disclosure.

[0030] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be defined and explained in subsequent drawings.

[0031] The term "and / or" herein is only used to describe an association relationship, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B and C can mean including any one or more elements selected from the set consisting of A, B and C.

[0032] FIG. 1 is a schematic diagram of a framework involved in a cell handover, and FIG. 1 is a related interface involved in a scheme of LTM random access channel (RACH-less) cell handover, which needs to consider three aspects:

[0033] 1. Acquisition of timing advance (TA) of a target cell;

[0034] 2. Acquisition of uplink (UL) authorization on the target cell;

[0035] 3. Beam alignment between a user equipment (UE) and the target cell.

[0036] Taking the RACH-less inter-DU cell handover scheme as an example, Fig. 2 is a schematic diagram of the inter-DU cell handover process, and the scheme has the following problems:

[0037] 1. The TA acquisition process needs to obtain the dedicated PRACH resource from the target cell of the target DU through the PRACH, and the problem is that the acquisition process involves multiple cells, multiple interfaces, and large time delay;

[0038] 2. When multiple target cells use the PRACH resource acquired in the first step to perform PRACH detection, there may be PRACH false detection and false detection, resulting in TA calculation error;

[0039] 3. The TA calculation is implemented in the physical layer of the target DU, and then the TA is transmitted through the XN interface between base stations, resulting in large time delay and high complexity.

[0040] 4. The uplink grant selection of the medium access control (MAC) layer of the target cell also needs to be transmitted through the XN interface between the source DU and the target DU, and the unacceptable time delay of the XN interface may cause the handover to be too late, thereby causing handover failure.

[0041] 5. The uplink resource allocation of the target cell needs to be scheduled and authorized in the source cell, and the system timing synchronization and scheduling synchronization between the source cell and the target cell need to be performed.

[0042] Compared with the LTM handover, the cell handover method of the present disclosure has a simple process and higher reliability; the system timing and scheduling synchronization between the source cell and the target cell do not need to be performed, and the handover reliability is higher and the handover time delay is lower.

[0043] In the following, each embodiment of the technical scheme of the present disclosure is introduced.

[0044] Fig. 3 is a schematic diagram of a random access method provided by an embodiment of the present disclosure, which is applied to a source cell and includes the following steps:

[0045] S301: sending handover request information to one or more candidate cells;

[0046] S302: receiving preconfigured information sent by the one or more candidate cells;

[0047] S303: in the case of selecting a target cell from the one or more candidate cells for the user equipment to switch to, sending indication information to the user equipment.

[0048] In the embodiment of the present disclosure, the source cell is the cell corresponding to the user equipment before the cell handover. The target cell, which can also be referred to as the target cell, is the cell corresponding to the user equipment after the cell handover.

[0049] In practical applications, user equipment may be various mobile user devices, such as mobile phones and cars; source cells and destination cells may be various types of base stations, such as drones, satellites, and aerial platforms.

[0050] In practical applications, the source cell sends L3 measurement configuration information to the user equipment, the user equipment performs L3 measurement according to the L3 measurement configuration information, and sends the L3 measurement report to the source cell; or, if the user equipment determines that the L3 measurement conditions are met, it performs L3 measurement and sends the L3 measurement report to the source cell.

[0051] When the source cell receives an L3 measurement report from the user equipment, if it determines that the user equipment needs to perform a cell handover based on the information in the L3 measurement report, it further selects a candidate cell for the conditional handover based on the information in the L3 measurement report.

[0052] After selecting one or more target candidate cells that meet the handover conditions based on the L3 measurement report information, the source cell sends a handover request to one or more target candidate cells.

[0053] In this embodiment of the disclosure, the handover request information includes random access indication information.

[0054] In practical applications, the random access indication information in the handover request information is an indication field used to indicate that a one-step handover random access should be performed; this random access indication information indicates that the target candidate cell should perform cell handover through one-step random access.

[0055] In some implementations, the handover request information further includes the uplink pre-scheduled data volume of the user equipment; the uplink pre-scheduled data volume is used by the destination cell to allocate uplink scheduling resources to the user equipment when the user equipment accesses the destination cell.

[0056] In addition to random access indication information, handover request information also includes uplink pre-scheduled data volume of user equipment (such as Buffer Status Report, BSR) information, which is used as a reference for resource allocation evaluation for uplink scheduling in the event of a successful handover by the source cell.

[0057] In this embodiment of the disclosure, when each target candidate cell receives a handover request information sent by the source cell, it responds to the received handover request information and sends the pre-configuration information of the target candidate cell to the source cell.

[0058] In this embodiment of the disclosure, the pre-configuration information sent by the candidate cell to the source cell includes the Physical Random Access Channel (PRACH) information corresponding to each candidate cell.

[0059] In actual application, the PRACH information of the candidate cell in the pre-configuration information sent by the candidate cell is used for the candidate cell to confirm that the handover is successful in the case that the candidate cell receives the PRACH information of the candidate cell sent by the user equipment.

[0060] In the embodiment of the present disclosure, the source cell sends indication information to the user equipment in the case that the source cell selects a destination cell from one or more candidate cells for the user equipment to migrate to, the indication information includes the identification information of the destination cell, the random access indication information and the PRACH information of the destination cell; the indication information is used to instruct the user equipment to send the PRACH information of the destination cell to the destination cell, and the PRACH information of the destination cell is used to inform the destination cell that the user equipment has randomly accessed to the destination cell.

[0061] In actual application, the source cell sends a reconfiguration message (i.e. the indication information in the embodiment of the present disclosure) carrying conditional handover information, the identification information of the destination cell, the dedicated PRACH related information allocated by the destination cell and the indication field used to instruct one-step handover random access.

[0062] After receiving the reconfiguration message sent by the source cell, the user equipment sends the dedicated PRACH information of the destination cell to the destination cell. The destination cell detects the dedicated PRACH message and identifies that the one-step random access handover is successful, and at the same time of informing the upper layer that the handover is successful, the destination cell sends downlink data and schedules uplink data, so that the data transmission of the handover destination and the handover process are completed in parallel.

[0063] In actual application, the indication information sent by the source cell to the user equipment is MAC CE information, i.e. MAC control element information, which is one way of exchanging control information between the UE and the network.

[0064] The technical solution of the embodiment of the present disclosure adds random access indication information in the handover request message, so as to instruct the destination cell and the user equipment to use PRACH message to indicate that the cell handover is successful, simplify the cell handover process, reduce the data delay and improve the success rate of cell handover.

[0065] FIG. 4 is a flowchart of a random access method provided by the embodiment of the present disclosure, which is applied to a source cell and includes the following steps:

[0066] S401: sending handover request information to one or more candidate cells;

[0067] S402: receiving pre-configuration information sent by the one or more candidate cells;

[0068] S403: receiving the layer 1 measurement report sent by the user equipment;

[0069] S404: selecting a target cell for the user equipment to switch to from the one or more candidate cells according to the signal strength information in the layer 1 measurement report and / or the layer 3 measurement report.

[0070] The steps S401 and S402 can be understood with reference to the related solutions of the steps S301 and S302.

[0071] In actual applications, the one or more candidate cells are cells selected by the source cell from the target cells according to the layer 3 measurement report in a case that the source cell determines that the user equipment needs to perform cell switching according to the layer 3 measurement report.

[0072] In addition to the L3 measurement report, the source cell can further select a target cell for the user equipment to switch to from the target candidate cells according to the L1 measurement report or in combination with the L1 and L3 measurement reports. For example, the source cell determines the movement trend of the user equipment by using the signal strength change of the L3 measurement report and the L1 measurement report, makes a switching decision, and selects a target switching cell.

[0073] In some embodiments, the step S404 includes:

[0074] S4041: selecting a cell satisfying a switching decision condition from the one or more candidate cells according to the signal strength information in the layer 1 measurement report and / or the layer 3 measurement report;

[0075] S4042: determining the cell satisfying the switching decision condition as the target cell for the user equipment to switch to.

[0076] The source cell determines the movement trend of the user equipment by using the L3 and L1 measurement reports, and the specific method includes a larger trend of signal strength of two measurement results, a smaller trend of TA of two measurement results, or an equivalent use of signal quality determination trend method. The greater the same determination trend change is, the higher the priority is, and one or more of the following parameters can be used to determine the threshold value: reference signal received power (RSRP), reference signal received quality (RSRQ), signal to interference and noise ratio (SINR), TA value, and the like.

[0077] In actual applications, the decision condition includes one or more of the following:

[0078] The first condition includes: a reference signal received power (RSRP) in a layer 1 measurement report of the candidate cell is greater than or equal to an RSRP in a layer 3 measurement report, a reference signal received quality (RSRQ) in the layer 1 measurement report of the candidate cell is greater than or equal to an RSRQ in the layer 3 measurement report, and a time advance (TA) calculated according to the layer 1 measurement report of the candidate cell is less than or equal to a TA calculated according to the layer 3 measurement report;

[0079] The second condition includes: the RSRP in the layer 1 measurement report of the candidate cell is greater than or equal to an RSRP threshold value, the RSRQ in the layer 1 measurement report of the candidate cell is greater than or equal to an RSRQ threshold value, and the TA calculated according to the layer 1 measurement report of the candidate cell is less than or equal to a TA threshold value;

[0080] The third condition includes: a difference value and / or a difference change rate of the RSRP in the layer 1 measurement report of the candidate cell relative to the RSRP in the layer 3 measurement report is maximum, a difference value and / or a difference change rate of the RSRQ in the layer 1 measurement report of the candidate cell relative to the RSRQ in the layer 3 measurement report is maximum, and a difference value and / or a difference change rate of the TA calculated according to the layer 1 measurement report of the candidate cell relative to the TA calculated according to the layer 3 measurement report is maximum.

[0081] The first condition is:

[0082] deltaRSRP = L1RSRP - L3RSRP >= 0;

[0083] deltaRSRQ = L1RSRQ - L3RSRQ >= 0;

[0084] deltaTA = L1TA - L3TA <= 0.

[0085] The second condition is:

[0086] L1RSRP >= ThresholdRSRP;

[0087] L1RSRQ >= ThresholdRSRQ;

[0088] L1TA <= ThresholdTA.

[0089] The third condition is:

[0090] MAX (deltaRSRP); MAX (deltaRSRQ); MAX (|deltaTA|).

[0091] The handover decision principle of the target cell is selected as: the candidate cell satisfying one or several combinations of (the first condition), (the second condition) and (the third condition) is the target cell for handover.

[0092] In the embodiments of the present disclosure, the TA of the candidate cell can be calculated according to the following parameters: the reference signal, the RSRP in the layer 1 measurement report and the frequency point loss characteristic.

[0093] According to the technical solution of the embodiments of the present disclosure, the source cell can use the signal strength information in the L3 measurement report and / or the L1 measurement report to make a handover decision and select a target handover cell; or, the source cell uses the signal strength change in the L3 measurement report and the L1 measurement report to determine the user equipment movement trend, makes a handover decision and selects a target handover cell.

[0094] FIG. 5 is a flowchart of a random access method provided by the embodiments of the present disclosure, applied to a source cell, including the following steps:

[0095] S501: sending handover request information to one or more candidate cells;

[0096] S502: receiving pre-configuration information sent by the one or more candidate cells;

[0097] S503: receiving a layer 1 measurement report sent by the user equipment;

[0098] S504: selecting a target cell for the user equipment to switch to from the one or more candidate cells according to the signal strength information in the layer 1 measurement report and / or the layer 3 measurement report;

[0099] S505: calculating the TA of the target cell according to the signal strength information in the layer 1 measurement report.

[0100] S506: sending indication information embodying the TA of the target cell to the user equipment.

[0101] The above steps S501 to S504 can be understood with reference to the related solutions of the above steps S401 to S404.

[0102] In the embodiments of the present disclosure, the TA value of the target cell is calculated by the source cell, and when the source cell calculates the TA, the influence of the real environment factor on the frequency fading factor is considered.

[0103] In actual application, the above step S505 includes: calculating the TA of the target cell according to one or more of the following parameters of the source cell and the target cell: the reference signal, the RSRP in the layer 1 measurement report and the frequency point loss characteristic.

[0104] The method for calculating the TA value of the candidate cell in the source cell is as follows:

[0105] Source cell path loss: PLScell=RS-RSRP;

[0106] Target cell path loss: PLNcell=RS-RSRP;

[0107] Theoretical value of the serving cell TAl: The Scell frequency point path loss characteristic refers to the inherent transmission power loss characteristic of the Scell using frequency point;

[0108] The real value of the serving cell TAz: is the real cumulative value of the serving cell, denoted as TAzScell.

[0109] The coefficient between the theory and the reality is the spatial characteristic factor:

[0110] Theoretical value of the handover candidate cell TAl:

[0111] The real value of the handover candidate cell TAz:

[0112] In the embodiment of the present disclosure, the transmission method of the cell reference signal reference power is added in the establishment or update stage (such as the XN establishment and XN configuration update process) of the inter-base station or inter-cell interface, which assists in the calculation of the TA value of the candidate cell in the source cell. The reference power (such as SSS power) of the cell is added in the establishment or configuration update process of the XN or other inter-base station (cell) interface, so that the TA of the target cell is evaluated in the source cell. In the embodiment of the present disclosure, the TA value calculated by the source cell is an absolute TA value relative to time alignment. The absolute TA value is an absolute value representation, that is, directly expressing the size of the time advance amount. The relative TA value is a relative value representation, and the relationship between the absolute TA value and the relative TA value is: the relative TA value (that is, the offset) of this time + the absolute TA value of the last time = the absolute TA value of this time.

[0113] For the calculation of the TA, a new IE (cell reference signal power information of the serving cell and the neighbor cell) can be added in the XN establishment process and the XN configuration update process of the TS 38.423 protocol.

[0114] In actual application, the user equipment can fine-tune the TA value according to its own algorithm, and the TA value is sent as the PRACH message, so as to improve the accuracy of the PRACH detection of the base station.

[0115] In actual application, the user equipment sends the PRACH information of the target cell to the target cell, and the TA of the target cell is embodied in the PRACH information of the target cell.

[0116] In the LTM switching scheme, the TA calculation is implemented in the physical layer of the target DU, and the TA is transmitted through the inter-base station XN interface interaction, which results in large delay and high complexity. In the embodiment of the present disclosure, the TA value of the target cell is calculated by the source cell, thereby reducing the TA transmission process between the source cell and the target cell. In addition, when the source cell calculates the TA, the influence of the real environment factor on the frequency fading factor is considered, so that the TA calculation method is more accurate.

[0117] FIG. 6 is a flowchart of a random access method provided by an embodiment of the present disclosure, which is applied to a target cell and includes the following steps:

[0118] S601: receiving the switching request information sent by the source cell;

[0119] S602: sending the pre-configuration information to the source cell;

[0120] S603: in the case that the PRACH information of the target cell sent by the user equipment is received, confirming that the user equipment accesses successfully.

[0121] In the embodiment of the present disclosure, the target cell is one of one or more target candidate cells to which the user equipment can be switched according to the information in the L3 measurement report.

[0122] In the case that the L3 measurement report sent by the user equipment is received, if it is judged according to the information in the L3 measurement report that the user equipment needs to be switched to another cell, the source cell further selects the target candidate cell for conditional switching according to the L3 measurement report information.

[0123] After the source cell selects one or more target candidate cells for conditional switching according to the L3 measurement report information, the source cell sends the switching request information to the one or more target candidate cells.

[0124] In the embodiment of the present disclosure, the switching request information includes random access indication information.

[0125] In actual application, the random access indication information in the switching request information is an indication field for indicating one-step switching random access. The random access indication information indicates that the target candidate cell performs cell switching through one-step random access.

[0126] In the embodiment of the present disclosure, the pre-configuration information includes PRACH information of the target cell; the PRACH information of the target cell is used for the source cell to send indication information to the user equipment in the case that the target cell is selected as the cell to which the user equipment switches; the indication information includes identification information of the target cell, the random access indication information and the PRACH information of the target cell.

[0127] In the embodiment of the present disclosure, the target cell sends the pre-configuration information of the target cell to the source cell in response to the received handover request information.

[0128] In the embodiment of the present disclosure, the pre-configuration information sent by the target cell to the source cell includes physical random access channel (PRACH) information corresponding to the target cell.

[0129] In actual application, the PRACH information of the candidate cell in the pre-configuration information sent by the target cell is used for the target cell to confirm that the user equipment successfully switches to the target cell in the case that the target cell receives the PRACH information of the target cell sent by the user equipment.

[0130] In the embodiment of the present disclosure, the source cell sends indication information to the user equipment in the case that the target cell is selected from one or more candidate cells to which the user equipment migrates; the indication information includes identification information of the target cell, the random access indication information and the PRACH information of the target cell; the indication information is used to instruct the user equipment to send the PRACH information of the target cell to the target cell, and the PRACH information of the target cell is used to inform the target cell that the user equipment has randomly accessed to the target cell.

[0131] In actual application, the source cell sends a reconfiguration message (i.e. the indication information in the embodiment of the present disclosure) carrying conditional handover information, identification information of the target cell, dedicated PRACH related information allocated by the target cell and an indication field used to instruct one-step handover random access.

[0132] After receiving the reconfiguration message sent by the source cell, the user equipment sends the dedicated PRACH information of the target cell to the target cell, and the target cell detects the dedicated PRACH message to identify that the one-step random access handover is successful.

[0133] In actual application, the indication information sent by the source cell to the user equipment is MAC CE information.

[0134] The technical scheme of the embodiments of the present disclosure adds random access indication information in the handover request message, thereby indicating that the target cell and the user equipment use the PRACH message to indicate the success of cell handover, simplifying the cell handover process, reducing the data delay, and improving the success rate of cell handover.

[0135] Fig. 7 is a flowchart of a random access method provided by the embodiments of the present disclosure, applied to a target cell, comprising:

[0136] S701: receiving handover request information sent by a source cell;

[0137] S702: sending pre-configuration information to the source cell;

[0138] S703: in the case of receiving PRACH information of the target cell sent by the user equipment, confirming that the user equipment accesses successfully;

[0139] S704: in the case of confirming that the user equipment accesses successfully, allocating uplink scheduling resources to the user equipment according to the uplink pre-scheduling data volume of the user equipment;

[0140] S705: in the case of confirming that the user equipment accesses successfully, sending downlink data to the user equipment and / or scheduling radio resource information for uplink data sent by the user equipment.

[0141] In some embodiments, the handover request information further comprises the uplink pre-scheduling data volume of the user equipment; and the uplink pre-scheduling data volume is used for allocating uplink scheduling resources to the user equipment according to the uplink scheduling data volume by the target cell in the case of the user equipment accessing to the target cell.

[0142] In addition to the random access indication information, the handover request information further comprises the uplink pre-scheduling data volume (such as BSR) information of the user equipment, which is used for the source cell to perform resource allocation evaluation reference for uplink scheduling in the case of successful handover.

[0143] In some embodiments, the PRACH information of the target cell sent by the user equipment embodies the TA of the target cell; and the TA of the target cell is calculated by the source cell using the signal strength information in the layer 1 measurement report.

[0144] In the embodiments of the present disclosure, the TA value of the target cell is calculated by the source cell, and when the source cell calculates the TA, the influence of real environment factors on frequency fading factors is considered.

[0145] The TA of the target cell is calculated according to one or more of the following parameters of the source cell and the target cell: a reference signal, an RSRP in a layer 1 measurement report, and a frequency point road loss characteristic. The method for the source cell to calculate the TA value of the target cell can be understood with reference to step S505 in the above embodiment.

[0146] In the technical solution of the embodiment of the present disclosure, after receiving the reconfiguration message sent by the source cell, the user equipment sends the dedicated PRACH information of the target cell to the target cell. The target cell detects the dedicated PRACH message and identifies that the one-step random access handover is successful. The target cell sends the downlink data and schedules the uplink data at the same time of informing the upper layer that the handover is successful, so that the target data transmission and the handover process are completed in parallel.

[0147] FIG. 8 is a flowchart of a sixth random access method provided by the embodiment of the present disclosure, applied to user equipment, including the following steps:

[0148] S801: receiving indication information sent by a source cell;

[0149] S802: sending PRACH information of the target cell to the target cell.

[0150] In the embodiment of the present disclosure, the indication information includes identification information of the target cell, the random access indication information, and the PRACH information of the target cell.

[0151] In the embodiment of the present disclosure, the PRACH information of the target cell is used to inform the target cell that the user equipment has randomly accessed to the target cell.

[0152] In actual application, before the above step S801, the following steps are further included:

[0153] In the case of detecting that the layer 1 measurement event triggering condition is met, performing the layer 1 measurement event and sending a layer 1 measurement report to the source cell.

[0154] In actual application, the source cell sends a reconfiguration message (i.e., the indication information in the embodiment of the present disclosure) carrying conditional handover information, identification information of the target cell, dedicated PRACH related information allocated by the target cell, and an indication field used to indicate one-step handover random access.

[0155] After receiving the reconfiguration message sent by the source cell, the user equipment sends the dedicated PRACH information of the target cell to the target cell. The target cell detects the dedicated PRACH message and identifies that the one-step random access handover is successful.

[0156] In actual application, the indication information sent by the source cell to the user equipment is MAC CE information.

[0157] In actual application, the source cell carries conditional handover information through a reconfiguration message, the message contains dedicated PRACH related information allocated by the target cell, and according to the preconfigured condition, the user equipment triggers a layer 1 measurement report after detecting that the event trigger condition is met, the measurement report contains RSRP and RSRQ equivalent information, which is used for handover decision of the source cell and TA calculation of the target cell.

[0158] In some embodiments, the indication information further includes a time advance TA of the target cell; and the TA of the target cell is calculated by the source cell according to signal strength information in the layer 1 measurement report of the user equipment. When the source cell performs TA calculation, the influence of real environment factors on frequency fading factors is considered.

[0159] In actual application, the user equipment can fine-tune the TA value of the target cell according to its own algorithm, and the TA value is sent as the TA value of the PRACH message, so as to improve the accuracy of PRACH detection of the base station.

[0160] In some embodiments, the user equipment sends the TA of the target cell in the PRACH information of the target cell to the target cell.

[0161] In the LTM handover scheme, TA calculation is implemented in the physical layer of the target DU, and then TA is transmitted through inter-base station XN interface interaction, which causes large delay and high complexity. In the embodiment of the present disclosure, the TA value of the target cell is calculated by the source cell, so as to reduce the TA transmission process between the source cell and the target cell; and when the source cell performs TA calculation, the influence of real environment factors on frequency fading factors is considered, so that the TA calculation method is more accurate.

[0162] By using the TA value calculated by the source cell side for sending the PRACH message, the detection accuracy of the PRACH can be improved, and the handover failure caused by the TA calculation error due to the blind detection of the PRACH scheduling, the PRACH false detection and false detection, and the target cell selection error in the LTM handover scheme is avoided. In addition, the present disclosure indicates the handover success by using the PRACH message, reduces the signaling process between cells or base stations, reduces the handover delay, and improves the handover success rate.

[0163] FIG. 9 is a random access flowchart provided by an embodiment of the present disclosure, and the random access process of FIG. 9 mainly includes the following four steps:

[0164] Step 1: the source cell (cell1) sends candidate cell preconfiguration information to the user equipment (UE), and the preconfiguration information includes L1 measurement configuration information of the candidate cell;

[0165] Step 2: After the user equipment (UE) performs the L1 measurement, the UE sends the L1 measurement report to the source cell (cell1);

[0166] Step 3: The source cell (cell1) sends a MAC CE message to the user equipment (UE);

[0167] Here, the MAC CE message includes destination cell identification or cell index information, a TA value of the destination cell, a one-step random access handover indication field, and a dedicated PRACH of the destination cell.

[0168] Step 4: The user equipment (UE) sends PRACH information embodying the TA value of the destination cell (cell2) to the destination cell (cell2).

[0169] After the destination cell (cell2) detects the PRACH information embodying the TA value of the destination cell (cell2), it determines that the one-step random access handover is successful.

[0170] The technical solution of the embodiment of the present disclosure uses dedicated PRACH information of the destination cell to inform the destination candidate cell of the success of the handover, and uses uplink pre-scheduling data volume information as a reference for resource allocation evaluation for uplink scheduling after the handover success message, so that the destination cell detects the dedicated PRACH message and identifies the success of the one-step random access handover, and sends downlink data and schedules uplink data while informing the upper layer of the success of the handover, thereby realizing the parallel process of the handover destination data transmission and the handover process.

[0171] The technical solution of the embodiment of the present disclosure uses the PRACH message to indicate the success of the handover, triggers the parallel process of the scheduling of uplink and downlink data and the handover process, simplifies the handover process, reduces data latency, and improves the success rate of the handover. Compared with the LTM handover process of FIG. 2, the signaling interaction steps involved in the entire handover process are significantly reduced, and the present disclosure can complete the handover using only 4 messages, reduces the TA sending process between the source cell and the destination cell, can reduce the latency of the handover process, and can simultaneously schedule uplink and downlink. In addition, the scheme of the embodiment of the present disclosure does not need message interaction and scheduling synchronization of PRACH resources and uplink scheduling resources between the source cell and the destination cell, thereby reducing the complexity of system coordination and synchronization.

[0172] Fig. 10 is a schematic diagram of a structure of a random access apparatus according to an embodiment of the present disclosure, which is applied to a source cell and includes: a first sending unit 1001 configured to send handover request information to one or more candidate cells, wherein the handover request information includes random access indication information; a first receiving unit 1002 configured to receive pre-configuration information sent by the one or more candidate cells, wherein the pre-configuration information includes PRACH information corresponding to each candidate cell; a second sending unit 1003 configured to, in the case that a target cell to which a user equipment is switched is selected from the one or more candidate cells, send indication information to the user equipment, wherein the indication information includes identification information of the target cell, the random access indication information and PRACH information of the target cell; the indication information is used to instruct the user equipment to send the PRACH information of the target cell to the target cell, and the PRACH information of the target cell is used to inform the target cell that the user equipment has randomly accessed to the target cell.

[0173] In some embodiments, the one or more candidate cells are cells selected by the source cell according to a layer 3 measurement report in the case that the user equipment needs to perform cell handover according to the layer 3 measurement report; the apparatus further includes: a selecting unit configured to receive a layer 1 measurement report sent by the user equipment; and select a target cell to which the user equipment is switched from the one or more candidate cells according to signal strength information in the layer 1 measurement report and / or the layer 3 measurement report.

[0174] In some embodiments, the selecting unit is configured to select a cell satisfying a handover decision condition from the one or more candidate cells according to signal strength information in the layer 1 measurement report and / or the layer 3 measurement report; and determine the cell satisfying the handover decision condition as the target cell to which the user equipment is switched.

[0175] In some embodiments, the handover decision condition includes one or more of the following: a first condition, a second condition and a third condition.

[0176] The first condition includes: a RSRP in a layer 1 measurement report of a candidate cell is greater than or equal to a RSRP in a layer 3 measurement report, a RSRQ in the layer 1 measurement report of the candidate cell is greater than or equal to a RSRQ in the layer 3 measurement report, and a TA calculated according to the layer 1 measurement report of the candidate cell is less than or equal to a TA calculated according to the layer 3 measurement report.

[0177] The second condition comprises: the RSRP in the layer 1 measurement report of the candidate cell is greater than or equal to an RSRP threshold value, the RSRQ in the layer 1 measurement report of the candidate cell is greater than or equal to an RSRQ threshold value, and the TA calculated according to the layer 1 measurement report of the candidate cell is less than or equal to a TA threshold value.

[0178] The third condition comprises: the difference and / or difference change rate of the RSRP in the layer 1 measurement report of the candidate cell relative to the RSRP in the layer 3 measurement report is maximum, the difference and / or difference change rate of the RSRQ in the layer 1 measurement report of the candidate cell relative to the RSRQ in the layer 3 measurement report is maximum, and the difference and / or difference change rate of the TA calculated according to the layer 1 measurement report of the candidate cell relative to the TA calculated according to the layer 3 measurement report is maximum.

[0179] In some embodiments, the indication information further comprises the TA of the target cell, and the apparatus further comprises: a calculation unit, configured to calculate the TA of the target cell according to the signal strength information in the layer 1 measurement report.

[0180] In some embodiments, the calculation unit is configured to calculate the TA of the target cell according to one or more of the following parameters of the source cell and the target cell: reference signal, RSRP in the layer 1 measurement report, frequency point road loss characteristics.

[0181] In some embodiments, the user equipment sends the TA of the target cell to the target cell in the PRACH information of the target cell.

[0182] In some embodiments, the handover request information further comprises an uplink pre-scheduling data amount of the user equipment, wherein the uplink pre-scheduling data amount is used for allocating uplink scheduling resources for the user equipment by the target cell according to the uplink scheduling data amount in the case that the user equipment accesses to the target cell.

[0183] Those skilled in the art should understand that the implementation functions of each unit in the random access apparatus shown in FIG. 10 can be understood with reference to the foregoing description of the random access method on the source cell side. The functions of each unit in the random access apparatus shown in FIG. 10 can be implemented by a program running on a processor, or by a specific logic circuit.

[0184] Fig. 11 is a schematic diagram of a structure of a random access device according to an embodiment of the present disclosure, which is applied to a target cell and includes a second receiving unit 1101 configured to receive a handover request information sent by a source cell, wherein the handover request information includes random access indication information; a third sending unit 1102 configured to send pre-configuration information to the source cell, wherein the pre-configuration information includes PRACH information of the target cell; the PRACH information of the target cell is used by the source cell to send indication information to a user equipment in a case that the target cell is selected as a cell to which the user equipment is handed over, wherein the indication information includes identification information of the target cell, the random access indication information and the PRACH information of the target cell; and a confirming unit 1103 configured to confirm that the user equipment is successfully accessed in a case that the PRACH information of the target cell sent by the user equipment is received.

[0185] In some embodiments, the handover request information further includes an uplink pre-scheduling data volume of the user equipment, and the device further includes an allocating unit configured to allocate uplink scheduling resources to the user equipment according to the uplink pre-scheduling data volume of the user equipment in a case that the user equipment is successfully accessed.

[0186] In some embodiments, the device further includes a processing unit configured to send downlink data to the user equipment and / or schedule radio resources for uplink data sent by the user equipment in a case that the user equipment is successfully accessed.

[0187] In some embodiments, the PRACH information of the target cell sent by the user equipment includes TA of the target cell; and the TA of the target cell is calculated by the source cell using signal strength information in a layer 1 measurement report.

[0188] Those skilled in the art should understand that the implementation functions of each unit in the random access device shown in Fig. 11 can be understood with reference to the foregoing related description of the random access method on the side of the target cell. The functions of each unit in the random access device shown in Fig. 11 can be implemented by a program running on a processor, or by a specific logic circuit.

[0189] Fig. 12 is a schematic diagram of a structure of a random access device according to an embodiment of the present disclosure, which is applied to a user equipment, and includes: a third receiving unit 1201 configured to receive indication information sent by a source cell; the indication information includes identification information of a target cell, random access indication information, and PRACH information of the target cell; and a fourth sending unit 1202 configured to send the PRACH information of the target cell to the target cell; the PRACH information of the target cell is used to inform the target cell that the user equipment has randomly accessed to the target cell.

[0190] In some embodiments, the device further includes a measuring unit configured to perform a layer 1 measurement event and send a layer 1 measurement report to the source cell if it is detected that a layer 1 measurement event trigger condition is met.

[0191] In some embodiments, the indication information further includes a time advance TA of the target cell; the TA of the target cell is calculated by the source cell according to signal strength information in the layer 1 measurement report of the user equipment.

[0192] In some embodiments, the user equipment sends the TA of the target cell in the PRACH information of the target cell to the target cell.

[0193] Those skilled in the art should understand that the implementation functions of each unit in the random access device shown in Fig. 12 can be understood with reference to the foregoing related description of the random access method on the user equipment side. The functions of each unit in the random access device shown in Fig. 12 can be implemented by a program running on a processor, or by a specific logic circuit.

[0194] Fig. 13 is a schematic diagram of a structure of an electronic device according to an embodiment of the present disclosure. As shown in Fig. 13, the electronic device includes a communication component 1303 for data transmission, at least one processor 1301, and a memory 1302 for storing computer programs capable of running on the processor 1301. Each component in the user equipment is coupled together through a bus system 1304. It can be understood that the bus system 1304 is used to realize the connection and communication between these components. In addition to a data bus, the bus system 1304 also includes a power bus, a control bus, and a status signal bus. However, for the purpose of clarity and conciseness, all kinds of buses are marked as the bus system 1304 in Fig. 13.

[0195] The processor 1301 executes the computer programs to perform at least the steps of the methods shown in Figs. 3-5, or Figs. 6-7, or Fig. 8.

[0196] It can be appreciated that the memory 1302 can be volatile memory or nonvolatile memory, or both. Access to memory 1302 by other components of the system 1300 can be controlled by a memory controller. Nonvolatile memory can be, for example, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), magnetic random access memory (FRAM), flash memory, magnetic surface storage, or optical disc (e.g., CD-ROM). Magnetic surface storage can be magnetic disc storage or magnetic tape storage. Volatile memory can be, for example, random access memory (RAM), used as external cache. By way of example, and without limitation, many forms of RAM can be used, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus random access memory (DRRAM).The memory 1302 described in the embodiments of the present disclosure is intended to include, but is not limited to, these and any other suitable type of memory.

[0197] The method disclosed in the embodiments of the present disclosure can be applied to the processor 1301 or implemented by the processor 1301. The processor 1301 can be an integrated circuit chip having a signal processing capability. In the implementation process, the steps of the above method can be completed by hardware integrated logic circuits in the processor 1301 or instructions in the form of software. The processor 1301 described above can be a general processor, a DSP, or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The processor 1301 can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of the present disclosure. The general processor can be a microprocessor or any conventional processor, etc. In combination with the steps of the method disclosed in the embodiments of the present disclosure, the hardware decoding processor can be directly implemented or executed by a combination of hardware and software modules in the decoding processor. The software module can be located in the storage medium, which is located in the memory 1302. The processor 1301 reads the information in the memory 1302 and combines the hardware to complete the steps of the above method.

[0198] In exemplary embodiments, the electronic device can be implemented by one or more application specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), FPGAs, general-purpose processors, controllers, MCUs, microprocessors (Microprocessors), or other electronic elements, for executing the above-described random access method.

[0199] The embodiments of the present disclosure also provide a computer readable storage medium having a computer program stored thereon, wherein the program is executed by a processor to at least perform the steps of the method shown in FIGS. 3 to 5, or FIGS. 6 to 7, or FIG. 8. The computer readable storage medium can be a memory. The memory can be the memory 1302 as shown in FIG. 13.

[0200] The embodiment of the present disclosure further provides a computer program product, comprising a computer program, which can be executed by the processor 1301 in the electronic device shown in FIG. 13 to complete each step of the random access method described in the foregoing source cell side embodiment; or complete each step of the random access method described in the foregoing target cell side embodiment; or complete each step of the random access method described in the foregoing user equipment side embodiment.

[0201] The technical solutions described in the embodiments of the present disclosure can be combined arbitrarily without conflict.

[0202] In several embodiments provided by the present disclosure, it should be understood that the disclosed method and intelligent device can be implemented by other means. The device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the various components shown or discussed can be indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or in other forms.

[0203] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0204] In addition, each functional unit in each embodiment of the present disclosure can be integrated into a second processing unit, or each unit can be a separate unit, or two or more units can be integrated into one unit; the integrated unit can be realized in the form of hardware or in the form of hardware plus software functional unit.

[0205] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure.

Claims

1. A random access method applied to a source cell, the method comprising: sending handover request information to one or more candidate cells, wherein the handover request information comprises random access indication information; receiving pre-configuration information sent by the one or more candidate cells, wherein the pre-configuration information comprises physical random access channel (PRACH) information corresponding to each candidate cell; in a case where a target cell to which a user equipment is handed over is selected from the one or more candidate cells, sending indication information to the user equipment, wherein the indication information comprises identification information of the target cell, the random access indication information, and PRACH information of the target cell; the indication information is used to instruct the user equipment to send the PRACH information of the target cell to the target cell, and the PRACH information of the target cell is used to inform the target cell that the user equipment has randomly accessed to the target cell.

2. The method of claim 1, wherein, the one or more candidate cells are cells selected according to a layer 3 measurement report in a case where the source cell determines that the user equipment needs to be handed over according to the layer 3 measurement report; the selecting of the target cell to which the user equipment is handed over from the one or more candidate cells comprises: receiving a layer 1 measurement report sent by the user equipment; selecting a target cell to which the user equipment is handed over from the one or more candidate cells according to signal strength information in the layer 1 measurement report and / or the layer 3 measurement report.

3. The method of claim 2, wherein, the selecting of the target cell to which the user equipment is handed over from the one or more candidate cells according to signal strength information in the layer 1 measurement report and / or the layer 3 measurement report comprises: selecting a cell satisfying a handover decision condition from the one or more candidate cells according to signal strength information in the layer 1 measurement report and / or the layer 3 measurement report; determining the cell satisfying the handover decision condition as the target cell to which the user equipment is handed over.

4. The method of claim 3, wherein, the handover decision condition comprises one or more of a first condition, a second condition, and a third condition; the first condition comprises that reference signal received power (RSRP) in a layer 1 measurement report of a candidate cell is greater than or equal to RSRP in a layer 3 measurement report, reference signal received quality (RSRQ) in the layer 1 measurement report of the candidate cell is greater than or equal to RSRQ in the layer 3 measurement report, and time advance (TA) calculated according to the layer 1 measurement report of the candidate cell is less than or equal to TA calculated according to the layer 3 measurement report; the second condition comprises that RSRP in the layer 1 measurement report of the candidate cell is greater than or equal to an RSRP threshold value, RSRQ in the layer 1 measurement report of the candidate cell is greater than or equal to an RSRQ threshold value, and TA calculated according to the layer 1 measurement report of the candidate cell is less than or equal to a TA threshold value; The third condition includes: the difference and / or the difference change rate of the RSRP in the layer 1 measurement report of the candidate cell relative to the RSRP in the layer 3 measurement report is maximum, the difference and / or the difference change rate of the RSRQ in the layer 1 measurement report of the candidate cell relative to the RSRQ in the layer 3 measurement report is maximum, and the difference and / or the difference change rate of the TA calculated according to the layer 1 measurement report of the candidate cell relative to the TA calculated according to the layer 3 measurement report is maximum.

5. The method of claim 2, wherein, The indication information further includes the TA of the target cell, and before the step of sending the indication information to the user equipment, the method further includes: calculating the TA of the target cell according to the signal strength information in the layer 1 measurement report.

6. The method of claim 5, wherein, The step of calculating the TA of the target cell according to the signal strength information in the layer 1 measurement report includes: calculating the TA of the target cell according to one or more of the following parameters of the source cell and the target cell: reference signal, RSRP in the layer 1 measurement report, frequency point loss characteristics.

7. The method of claim 5 or 6, wherein, The user equipment sends the TA of the target cell to the target cell in the PRACH information of the target cell.

8. The method of any one of claims 1 to 6, wherein, The handover request information further includes the uplink pre-scheduling data volume of the user equipment; the uplink pre-scheduling data volume is used for the target cell to allocate uplink scheduling resources for the user equipment according to the uplink scheduling data volume in the case that the user equipment accesses to the target cell.

9. A random access method applied to a target cell, the method comprising: receiving handover request information sent by a source cell, wherein the handover request information includes random access indication information; sending pre-configuration information to the source cell, wherein the pre-configuration information includes PRACH information of the target cell; the PRACH information of the target cell is used for the source cell to send indication information to user equipment in the case that the target cell is selected as the cell to which the user equipment is handed over; the indication information includes identification information of the target cell, the random access indication information, and the PRACH information of the target cell; in the case that the PRACH information of the target cell sent by the user equipment is received, it is confirmed that the user equipment accesses successfully.

10. The method of claim 9, wherein, The handover request information further includes the uplink pre-scheduling data volume of the user equipment, and the method further includes: in the case that it is confirmed that the user equipment accesses successfully, allocating uplink scheduling resources for the user equipment according to the uplink pre-scheduling data volume of the user equipment.

11. The method according to claim 10, further comprising: in the case that it is confirmed that the user equipment accesses successfully, sending downlink data to the user equipment and / or scheduling radio resource information for uplink data sent by the user equipment.

12. The method of any one of claims 9-11, wherein, The TA of the target cell is embodied in the PRACH information of the target cell sent by the user equipment; the TA of the target cell is calculated by the source cell using signal strength information in the layer 1 measurement report.

13. A random access method applied to user equipment, the method comprising: receive indication information sent by a source cell, wherein the indication information comprises identification information of the target cell, the random access indication information and PRACH information of the target cell; send the PRACH information of the target cell to the target cell, wherein the PRACH information of the target cell is used to inform the target cell that the user equipment has randomly accessed to the target cell.

14. The method of claim 13, wherein, Before receiving the indication information sent by the source cell, the method further comprises: in a case where it is detected that a layer 1 measurement event trigger condition is met, performing a layer 1 measurement event and sending a layer 1 measurement report to the source cell.

15. The method of claim 14, wherein, The indication information further comprises time advance TA of the target cell; the TA of the target cell is calculated by the source cell according to signal strength information in the layer 1 measurement report of the user equipment.

16. The method of claim 15, wherein, The user equipment sends the TA of the target cell to the target cell in the PRACH information of the target cell.

17. An electronic device comprising: a memory and a processor, wherein the memory stores computer executable instructions, and the processor executes the computer executable instructions stored in the memory to implement the method in any one of claims 1 to 8, or to implement the method in any one of claims 9 to 12, or to implement the method in any one of claims 13 to 16.

18. A computer storage medium having stored thereon a computer program, wherein, The computer program is executed by the processor to implement the method in any one of claims 1 to 8, or to implement the method in any one of claims 9 to 12, or to implement the method in any one of claims 13 to 16.

19. A computer program product comprising a computer program, wherein, The computer program is executed by the processor to implement the method in any one of claims 1 to 8, or to implement the method in any one of claims 9 to 12, or to implement the method in any one of claims 13 to 16.

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