Preamble sequence retransmission method, user equipment and base station

Abstract

The embodiment of the present invention provides a method for retransmitting a preamble sequence, a user equipment and a base station, the method comprising: the base station determines system configuration information and sends the system configuration information to the user equipment, and then the user equipment sends a preamble sequence to perform random access, when the random access fails, the user equipment resends the preamble sequence to the base station according to the received random access preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information to perform random access until a preset judgment condition is met. The embodiment of the present invention is applicable to resending the preamble sequence to the base station for random access after the preamble sequence fails to be sent.

Description

[0001] This application is a divisional application of the invention patent application with application number 201711207129.X and invention name “Method for retransmitting a preamble sequence, user equipment and base station”. Technical Field

[0002] The present invention relates to the field of wireless communication technology, and in particular to a method for retransmitting a preamble sequence, a user equipment and a base station. Background Art

[0003] With the rapid development of the information industry, especially the growing demand from mobile Internet and Internet of Things (IoT), the future mobile communication technology has brought unprecedented challenges. For example, according to the report ITU-R M.[IMT.BEYOND 2020.TRAFFIC] of the International Telecommunication Union (ITU), it can be expected that by 2020, the growth of mobile business volume will increase by nearly 1,000 times compared with 2010 (4G era), and the number of user device connections will exceed 17 billion. As a large number of IoT devices gradually penetrate into mobile communication networks, the number of connected devices will be even more amazing. In order to cope with this unprecedented challenge, the communication industry and academia have launched extensive research on the fifth generation of mobile communication technology (5-Generation, 5G) for the 2020s. At present, the framework and overall goals of the future 5G are being discussed in the ITU report ITU-R M.[IMT.VISION], which provides detailed descriptions of the demand outlook, application scenarios and various important performance indicators of 5G. In response to new requirements in 5G, the ITU report ITU-R M.[IMT.FUTURE TECHNOLOGY TRENDS] provides information on technology trends for 5G, aiming to address significant issues such as significant improvement in system throughput, consistency in user experience, scalability to support IoT, latency, energy efficiency, cost, network flexibility, support for emerging services, and flexible spectrum utilization.

[0004] The random access (full name in English: Random Access) process is an important step in the wireless communication system, which is used to establish uplink synchronization between the user equipment and the base station, and the base station allocates an ID for the user equipment to identify the user equipment. The performance of random access directly affects the user experience. Among them, for traditional wireless communication systems, such as Long Term Evolution (full name in English: Long Term Evolution, abbreviated as: LTE) and Long Term Evolution-Advanced (full name in English: Long Term Evolution-Advanced, abbreviated as: LTE-A), the random access process is applied to multiple scenarios such as establishing an initial link, cell switching, re-establishing an uplink link, and reestablishing a radio resource control (full name in English: (Radio ReSource Control, English abbreviation: RRC) connection, and is divided into contention-based random access (full name in English: Contention-based Random Access) and non-contention-based random access (full name in English: Contention-free Random Access) according to whether the user equipment exclusively occupies the preamble sequence resources. AcceSS). In contention-based random access, each user equipment selects a preamble sequence from the same preamble sequence resource when trying to establish an uplink. Multiple user equipment may select the same preamble sequence to send to the base station. Therefore, the occurrence of such a conflict will lead to the failure of the preamble sequence transmission. How to design a random access preamble sequence retransmission method and improve the success probability of random access preamble sequence retransmission is a key indicator affecting random access performance.

[0005] The contention-based random access process in LTE-A is divided into four steps, such as Figure 1As shown. Before the random access process starts, the base station sends the configuration information of the random access process to the user equipment, and the user equipment performs the random access process according to the received configuration information. In the first step, the user equipment randomly selects a preamble sequence from the preamble sequence resource pool and sends it to the base station. The base station performs correlation detection on the received signal to identify the preamble sequence sent by the user equipment. In the second step, the base station sends a random access response (full name in English: Random Access Response, English abbreviation: RAR) to the user equipment, which includes a random access preamble sequence identifier, a timing advance instruction determined according to the delay estimation between the user equipment and the base station, and a temporary cell-radio network temporary identifier (full name in English: Temporary Cell-Radio Network In the third step, the user equipment sends a message three (abbreviated in English: MSg3) to the base station according to the information in the RAR. MSg3 includes information such as the user equipment terminal identifier and the RRC connection request. The user equipment terminal identifier is unique to the user equipment and is used to resolve conflicts. In the fourth step, the base station sends a conflict resolution identifier to the user equipment, which includes the user equipment terminal identifier that wins the conflict resolution. After detecting its own identifier, the user equipment upgrades the temporary cell radio network temporary identifier to the cell radio network temporary identifier (full name in English: Cell-Radio Network Temporary Identifier, abbreviated in English: C-RNTI), and sends an acknowledgment character (full name in English: Acknowledgement, abbreviated in English: ACK) signal to the base station to complete the random access process and wait for the scheduling of the base station. Otherwise, the user equipment will start a new random access process after a delay.

[0006] It should be noted that in the first and second steps above, the user equipment expects to receive the RAR within a time window, where the configuration of the time window is determined by the base station and sent in the configuration information before the random access process starts. If the user equipment does not receive the RAR sent by the base station within the set time window, the preamble sequence will be retransmitted; on the other hand, if the preamble sequence numbers contained in all RARs received by the user equipment in the second step are different from the preamble sequence numbers sent in the first step, the preamble sequence retransmission will also be triggered. In addition, if the conflict resolution in the fourth step fails, the preamble sequence retransmission will also be triggered.

[0007] For the non-competition-based random access process, since the base station knows the user equipment identity and can allocate a preamble sequence to the user equipment, the user equipment does not need to randomly select a sequence when sending the preamble sequence, but will use the allocated preamble sequence. After detecting the allocated preamble sequence, the base station will send a corresponding random access response, including information such as timing advance and uplink resource allocation. After receiving the random access response, the user equipment believes that the uplink synchronization has been completed and waits for further scheduling by the base station. Therefore, the initial access and non-competition-based random access process only include two steps: step one is to send the preamble sequence; step two is to send the random access response. Millimeter wave communication is a possible key technology for 5G. By increasing the carrier frequency to the millimeter wave band, the available bandwidth will be greatly increased, thereby greatly improving the transmission rate of the system. In order to combat the high fading and high loss characteristics of millimeter wave band wireless channels, millimeter wave communication systems generally use beamforming technology, that is, by using weighting factors, the beam energy is concentrated in a certain direction. During wireless communication, the base station and the user equipment search for the optimal beam pair through polling and other methods, thereby maximizing the received signal-to-noise ratio on the base station side and the user equipment side. Since the user equipment and the base station do not know the direction of the optimal beam pair when establishing the initial link, random access in millimeter wave communication systems faces great challenges.

[0008] However, in the 5G wireless communication system based on beamforming, insufficient transmission power or mismatched transmission beams can lead to failure of preamble transmission. However, during the random access process, the user equipment cannot know the specific cause of the failure.

[0009] In addition, in the existing 5G millimeter wave communication random access process, different processes and channel structures are designed based on the existence of beam reciprocity. There is no solution for how to design the corresponding preamble sequence retransmission method under different channel reciprocity conditions. Summary of the invention

[0010] In order to overcome the above technical problems or at least partially solve the above technical problems, the following technical solutions are proposed:

[0011] According to one aspect, an embodiment of the present invention provides a method for retransmitting a preamble sequence, which is performed by a user equipment, and the method includes:

[0012] Receiving system configuration information sent by a base station, the system configuration information including: random access resource configuration information and random access preamble sequence retransmission configuration information;

[0013] Sending a preamble sequence to the base station for random access;

[0014] If the random access fails, the preamble sequence is resent to the base station according to the received random access resource configuration information and the random access preamble sequence retransmission configuration information to perform random access until a preset judgment condition is met.

[0015] According to one aspect, an embodiment of the present invention provides a method for retransmitting a preamble sequence, which is performed by a base station, and the method includes:

[0016] Determine system configuration information;

[0017] The system configuration information is sent to the user equipment, where the system configuration information includes: random access preamble sequence resource configuration information and random access preamble sequence retransmission configuration information.

[0018] According to another aspect, an embodiment of the present invention provides a user equipment, wherein the user equipment includes:

[0019] A receiving module, configured to receive system configuration information sent by a base station, wherein the system configuration information includes random access resource configuration information and random access preamble sequence retransmission configuration information;

[0020] A sending module, used for sending a preamble sequence to the base station for random access;

[0021] The sending module is further used to resend the preamble sequence to the base station for random access when the random access fails according to the received random access resource configuration information and the random access preamble sequence retransmission configuration information, until a preset judgment condition is met.

[0022] According to another aspect, an embodiment of the present invention provides a base station, the base station comprising:

[0023] A determination module, used to determine system configuration information;

[0024] The sending module is used to send the system configuration information to the user equipment, where the system configuration information includes: random access resource configuration information and random access preamble sequence retransmission configuration information.

[0025] The present invention provides a method for retransmitting a preamble sequence, a user equipment and a base station. Compared with the prior art, in the present invention, the base station determines system configuration information and sends the system configuration information to the user equipment, and then the user equipment sends a preamble sequence to perform random access. When the random access fails, the user equipment resends the preamble sequence to the base station according to the received random access resource configuration information and the random access preamble sequence retransmission configuration information to perform random access until a preset judgment condition is met, that is, the base station can send the preamble sequence retransmission mechanism and the random access preamble sequence retransmission configuration information to the user equipment, so that after the random access fails, the user equipment retransmits the preamble sequence according to the above-mentioned preamble sequence retransmission mechanism and the random access preamble sequence retransmission configuration information to achieve random access, so that the user equipment can retransmit the preamble sequence according to the preamble sequence retransmission scheme.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0028] Figure 1 Schematic diagram of the traditional contention-based random access process;

[0029] Figure 2 A schematic diagram of a method for retransmitting a preamble sequence according to an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the transmitting end based on the antenna array;

[0031] Figure 4 Specifying a beam direction diagram for a user equipment;

[0032] Figure 5 A schematic diagram of a random access channel or subchannel structure when a base station has beam reciprocity;

[0033] Figure 6 A schematic diagram of a random access channel or subchannel structure when a base station does not have beam reciprocity;

[0034] Figure 7 A schematic diagram of a power ramp-up priority preamble retransmission process in which the preamble transmission power returns to the first transmission power after beam switching;

[0035] Figure 8 A schematic diagram of a power ramp-up priority preamble retransmission process in which the preamble transmission power remains unchanged after beam switching;

[0036] Fig. 9 A schematic diagram of a power ramp-up priority preamble retransmission process in which the preamble transmission power is increased after beam switching;

[0037] Fig.10 A schematic diagram of a beam switching priority preamble sequence retransmission process using the same beam for transmission after the preamble sequence transmission power is increased;

[0038] Fig.11 A schematic diagram of a beam switching priority retransmission process for transmitting using different beams after the preamble power is increased;

[0039] Fig.12 A schematic diagram of the process of transmitting power ramp and power conversion for the preamble sequence in conjunction with the retransmission of the preamble sequence;

[0040] Fig.13 A schematic diagram of the device structure of a user device;

[0041] Fig.14 A schematic diagram of the device structure of a base station. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0043] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0044] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0045] It will be understood by those skilled in the art that the "terminal" and "terminal device" used herein include both devices with wireless signal receivers, which are devices with only wireless signal receivers without transmission capabilities, and devices with receiving and transmitting hardware, which are devices with receiving and transmitting hardware capable of two-way communication over a two-way communication link. Such devices may include: cellular or other communication devices, which have a single-line display or a multi-line display or a cellular or other communication device without a multi-line display; PCS (Personal Communications Service), which may combine voice, data processing, fax and / or data communication capabilities; PDA (Personal Digital Assistant), which may include a radio frequency receiver, a pager, Internet / intranet access, a web browser, a notepad, a calendar and / or a GPS (Global Positioning System) receiver; conventional laptop and / or palmtop computers or other devices, which have and / or include a conventional laptop and / or palmtop computer or other device with a radio frequency receiver. The "terminal" or "terminal device" used herein may be portable, transportable, installed in a vehicle (air, sea and / or land), or adapted and / or configured to operate locally, and / or in a distributed form, at any other location on the earth and / or in space. The "terminal" or "terminal device" used herein may also be a communication terminal, an Internet terminal, a music / video playing terminal, such as a PDA, a MID (Mobile Internet Device) and / or a mobile phone with a music / video playing function, or a smart TV, a set-top box and other devices.

[0046] Among them, in a wireless communication system based on beamforming, the failure of preamble transmission may be caused by two reasons: insufficient transmission power and / or mismatch of transmission beam. For the failure of preamble transmission caused by the above two reasons, in addition to using the traditional power ramping method, the retransmission of the preamble can also use the beam switching (English full name: BeamSwitch) method. In addition, the random access resource reselection (English full name: RACH ResourceReselection) method can also be used. The specific retransmission method of the preamble sequence refers to the following embodiment.

[0047] Embodiment 1

[0048] The embodiment of the present invention provides a method for retransmitting a preamble sequence. Figure 2 As shown, the method comprises the following steps:

[0049] Step 201: The base station determines system configuration information.

[0050] Step 202: The base station sends system configuration information to the user equipment.

[0051] The system configuration information includes: random access preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information. In the embodiment of the present invention, the system configuration information may also include: random access preamble sequence format and random access resource configuration information.

[0052] Among them, the random preamble sequence retransmission mechanism and the random access preamble sequence retransmission configuration information may include the maximum number of preamble sequence transmissions, power ramp and beam switching steps, power ramp fixed step, single beam maximum number of transmissions, single power maximum number of transmissions, beam switching rules,

[0053] For the embodiment of the present invention, the base station may classify random access resources into two categories, wherein the first category is the random access resources corresponding to when the user equipment has beam reciprocity, and the second category is the random access resources corresponding to when the user equipment does not have beam reciprocity.

[0054] For the embodiment of the present invention, the base station may adopt Figure 3 The transmission structure based on the antenna matrix is ​​shown, in which each link after baseband processing is connected to an antenna array composed of antenna units through up-conversion and a digital-to-analog converter (English full name: Digital-to-Analog Converter, English abbreviation: DAC). Each antenna in the antenna array can only adjust the phase. By adjusting the phase, the antenna array can form a beam in a suitable direction to complete the beamforming of the system.

[0055] Step 203: The user equipment receives the system configuration information sent by the base station.

[0056] Step 204: The user equipment sends a preamble sequence to the base station to perform random access.

[0057] For the embodiment of the present invention, the user equipment selects the corresponding random access resource and the format of the random access preamble sequence from the received format of the random access preamble sequence and the configuration information of the random access resource according to the beam reciprocity information of the user equipment and the beam reciprocity information of the base station. In the embodiment of the present invention, the user equipment sends the preamble sequence to the base station according to the corresponding random access resource and the format of the random access preamble sequence for random access.

[0058] Specifically, the user equipment sends a preamble sequence to the base station according to the corresponding random access resource and the format of the random access preamble sequence, and through the first transmission power and the first transmission beam to perform random access.

[0059] Specifically, the preamble power climbing count corresponding to the first transmit power is 1.

[0060] Step 205: If the random access fails, the user equipment resends the preamble sequence to the base station according to the received random access preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information until a preset judgment condition is met.

[0061] For the embodiment of the present invention, the user equipment may also adopt Figure 3 The transmission structure based on the antenna matrix shown in FIG. 1 transmits the preamble sequence. In the embodiment of the present invention, in order to ensure beam coverage, the user equipment pre-specifies multiple beam directions pointing to different directions, such as Figure 4 As shown, the user equipment specifies 4 beams to complete the coverage of the space.

[0062] For the embodiment of the present invention, the system configuration information includes: a receiving time window for a random access response.

[0063] For the embodiment of the present invention, the above-mentioned random access failure includes at least one of the following situations:

[0064] (1) The user equipment does not receive the random access response information sent by the base station within the random access response receiving time window.

[0065] (2) The user equipment receives random access response information sent by the base station within the random access response reception time window, but the identifier of the preamble sequence carried in the random access response information is different from the identifier corresponding to the preamble sequence sent by the user equipment to the base station;

[0066] For the embodiment of the present invention, the base station detects the preamble sequence on the corresponding time-frequency resource. If the base station detects the sending of the preamble sequence, it sends a random access response (RAR) on the corresponding downlink time-frequency resource according to the detected preamble sequence, the time-frequency resource where the preamble sequence is located, and the detected timing advance (TA) and other information. The random access response includes the detected preamble sequence identifier, random access channel time-frequency resource information, timing advance information, and the allocated temporary cell radio network identifier (C-RNTI) and other information; if all the received random access responses do not contain the identifier corresponding to the preamble sequence sent in step 204, it indicates that the random access has failed.

[0067] (3) Message 3 times out.

[0068] (4) The user equipment receives random access response information sent by the base station within the random access response reception time window, and the identifier of the preamble sequence carried in the random access response information is the same as the identifier corresponding to the preamble sequence sent by the user equipment to the base station, but the identifier of the user equipment carried in the conflict resolution information received by the user equipment is different from the identifier corresponding to the preamble sequence.

[0069] For this embodiment of the present invention, if the user equipment detects that the random access channel time-frequency resources and the preamble sequence contained in the random access response are consistent with the random access channel resources and the preamble sequence used in step 204, it sends Msg3, which includes information such as the user equipment identifier and the RRC connection request. After that, the base station sends a conflict resolution identifier, wherein the conflict resolution identifier is the identifier corresponding to the user equipment that ultimately wins after the conflict is resolved. If the conflict resolution identifier is not the identifier of the user equipment that receives the conflict resolution identifier, it indicates that the random access has failed.

[0070] For the embodiment of the present invention, the preset judgment condition may be the maximum number of transmission times of the preamble sequence or the success of random access.

[0071] For the embodiment of the present invention, if the random access fails, the user equipment can resend the preamble sequence to the base station through at least the following three retransmission modes. In the embodiment of the present invention, the above three retransmission modes are respectively a power climbing priority preamble sequence retransmission mode, a beam switching priority preamble sequence retransmission mode, and a power climbing and beam switching combined preamble sequence retransmission mode.

[0072] The power climbing priority preamble retransmission method is specifically as follows: during the preamble retransmission process, the user equipment may give priority to the power climbing mechanism, that is, use the initial beam to increase the transmission power in a fixed step to retransmit the preamble. When the maximum number of retransmissions of the beam is reached or the maximum transmission power or other conditions preset by the user equipment is reached, the user equipment switches the transmission beam and repeats the above power climbing mechanism under the new beam until the maximum number of retransmissions of the new beam or the maximum transmission power is reached, and then the beam is switched again. If the maximum number of preamble transmissions is reached, the random access process is stopped. After the beam is switched, the user equipment may set the transmission power to the initial transmission state, use the initial transmission power to retransmit the preamble in the new beam, and configure the power climbing mechanism in possible subsequent retransmissions, or maintain the power climbing mechanism of the original beam, keep the original power unchanged or increase the preset number of fixed steps on the original transmission power, and retransmit the preamble in the new beam.

[0073] Among them, the beam switching priority preamble sequence retransmission method is specifically as follows: the user equipment can also give priority to the beam switching mechanism. When the preamble sequence is retransmitted, the transmission power is kept unchanged and the preamble sequence is transmitted using a new beam. When the maximum number of transmissions at the power is reached or all beams are traversed, the user equipment increases the transmission power and repeats the above beam switching mechanism under the new power until the maximum number of transmissions at the new power is reached or all beams are traversed or other conditions set by the user are other than the transmission power is increased again. In the process of retransmitting the preamble sequence, if the maximum number of transmissions of the preamble sequence is reached, the random access process is stopped.

[0074] The specific method of power climbing and beam switching combined with preamble retransmission is as follows: the user equipment can also use the power climbing mechanism and the beam switching mechanism at the same time. When the preamble is retransmitted, the preamble is sent in sequence using several beams including the initial beam. In the subsequent retransmission process, this multi-beam transmission method is used until the maximum transmission time of the preamble is reached and the random access process is stopped or the preamble is successfully sent. The transmission power of the initial beam and the new beam both use a power climbing mechanism with equal steps. The transmission power of the preamble retransmission of the new beam can be the same as that of the initial beam, or each independent power climbing mechanism can be configured.

[0075] For the embodiment of the present invention, whether the user equipment and the base station have beam reciprocity directly affects the structure of the random access channel.

[0076] For the embodiment of the present invention, if the user equipment has beam reciprocity, the random access channel consists of only a single random access sub-channel; if the user equipment does not have beam reciprocity, the random access channel consists of a single or multiple random access sub-channels.

[0077] For the embodiment of the present invention, if the base station has beam reciprocity, the base station can determine the optimal beam direction of the base station through the correspondence between the downlink synchronization signal and the random access channel. Therefore, the base station does not need to determine the beam direction by beam scanning, but only needs to specify the correspondence between the downlink synchronization signal and the random access channel. The optimal beam direction on the base station side is determined through the correspondence. At this time, the preamble sequence used for random access does not need to be sent in a repeated manner, such as Figure 5 A possible random access channel structure is introduced as shown in FIG. Figure 5 In the random access channel, the random access channel consists of a cyclic prefix (full name in English: Cyclic prefix, English abbreviation: CP), a single preamble sequence and a possible protection time (full name in English: GuardTime).

[0078] For the embodiment of the present invention, if the base station does not have beam reciprocity, the base station needs to determine the optimal receiving beam direction on the base station side by beam scanning, and the user needs to indicate the optimal transmitting beam on the base station side when sending the preamble sequence. The preamble sequence needs to be sent in a repeated manner so that the base station can receive it in a beam scanning manner, such as Figure 6 A possible random access channel or random access subchannel structure is introduced as shown in FIG. Figure 6 As shown, a random access channel consists of a cyclic prefix, a preamble sequence consisting of one or more subsequences, and a possible guard time. The number of repetitions of the subsequence is related to the beam direction that needs to be scanned at the base station side.

[0079] According to the embodiment of the present invention, in the transmission and retransmission of the preamble sequence, the user equipment adopts the above-mentioned random access channel or random access sub-channel structure.

[0080] It should be noted that when the transmission beam of the user equipment changes, an indication of the beam change may be sent from the upper layer to the lower layer. In this case, the lower layer (physical layer, medium access control layer) of the user equipment obtains the change of the transmission beam by receiving the indication information of the beam change sent by the upper layer.

[0081] An embodiment of the present invention provides a method for retransmitting a preamble sequence. Compared with the prior art, in the embodiment of the present invention, a base station determines system configuration information and sends the system configuration information to a user device, and then the user device sends a preamble sequence to perform random access. When the random access fails, the user device resends the preamble sequence to the base station according to the received random access preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information to perform random access until a preset judgment condition is met, that is, the base station can send the preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information to the user device, so that after the random access fails, the user device retransmits the preamble sequence according to the above-mentioned preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information to achieve random access, so that the user device can retransmit the preamble sequence according to the preamble sequence retransmission scheme.

[0082] Embodiment 2

[0083] Another possible implementation of an embodiment of the present invention, wherein the random access preamble sequence retransmission configuration information includes: a fixed step size of power ramping, based on the first embodiment, step 205, if the random access fails, the user equipment resends the preamble sequence to the base station according to the received random access preamble sequence retransmission mechanism and the random access preamble sequence retransmission configuration information to perform random access until a preset judgment condition is met, including steps 305 and / or 306 shown in the second embodiment, wherein the operations performed in steps 301-304 are similar to the operations performed in steps 201-204, and are not repeated here.

[0084] Step 305: If the random access fails, the user equipment increases the transmit power of the preamble sequence according to a preset number of power ramp steps to perform random access.

[0085] Specifically, the step of increasing the transmission power of the preamble sequence according to a preset number of power climbing steps to perform random access includes: increasing the preamble power climbing count by 1; and increasing the transmission power of the preamble sequence according to the increased preamble power climbing count to perform random access.

[0086] Step 306: If the transmit beam of the preamble sequence changes and / or the random access resource changes, the user equipment increases the transmit power of the preamble sequence by a preset number of powers to perform random access until a preset judgment condition is met.

[0087] For the embodiment of the present invention, the manner of determining that the transmit beam of the preamble sequence has changed includes: determining that the transmit beam of the preamble sequence has changed based on receiving an indication of the transmit beam change sent by a higher layer.

[0088] Embodiment 3

[0089] Another possible implementation method of the embodiment of the present invention, based on the second embodiment, step 305, if the random access fails, the user equipment increases the transmit power of the preamble sequence according to a preset number of power ramp steps to perform random access; and / or, step 306, if the transmit beam of the preamble sequence changes, and / or the random access resource changes, the user equipment increases the transmit power of the preamble sequence according to a preset number of powers to perform random access until the preset judgment condition is met, including steps 405-410 shown in the third embodiment, wherein the operations performed in steps 401-404 are similar to the operations performed in steps 301-304, and are not repeated here.

[0090] Step 405: If the random access fails, the user equipment determines a second transmission power, and resends the preamble sequence to the base station through the first beam and the second transmission power.

[0091] The second transmission power is a power increase fixed step size with a preset number of steps added to the first transmission power, and the first transmission power is the transmission power of the first transmission of the preamble sequence.

[0092] For the embodiment of the present invention, before the user equipment sends the preamble sequence, the user equipment needs to determine the initial preamble target received power (full name in English: Preamble Initial Received Target Power) and the transmit power compensation based on the preamble sequence format (full name in English: DELTA_PREAMBLE) to determine the first transmit power.

[0093] Among them, the first sending power = Preamble Initial Received Target Power + DELTA_PREAMBLE.

[0094] For the embodiment of the present invention, before the user equipment sends the preamble sequence, the user equipment sets the preamble transmission count (full name in English: PREAMBLE_TRANSMISSION_COUNTER) to 1 and the preamble power ramp count (full name in English: PREAMBLE_TRANSMISSION_POWER_COUNTER) to 1.

[0095] Step 406: If the random access fails, the user equipment increases the preamble sequence transmit power according to a preset number of fixed power ramp steps, and resends the preamble sequence to the base station through the increased preamble sequence transmit power and the first beam.

[0096] For the embodiments of the present invention, the user equipment receives a random access response within the reception time window of the random access response specified in the system configuration information. Among them, if no random access response is received within this time window, or the identifier of the preamble sequence carried in the random access response information is different from the identifier corresponding to the preamble sequence sent by the user equipment to the base station, or the identifier of the user equipment carried in the conflict resolution information is different from its corresponding identifier, then the preamble transmission count PREAMBLE_TRANSMISSION_COUNTER is incremented by 1 to obtain the current preamble transmission count value PREAMBLE_TRANSMISSION_COUNTER_1.

[0097] Among them, if

[0098] PREAMBLE_TRANSMISSION_COUNTER_1 = PreambleTransMax + 1, it reaches the maximum number of preamble sequence transmissions, and it is regarded as the failure of this random access process, and this random access process is ended.

[0099] Among them, if

[0100] PREAMBLE_TRANSMISSION_COUNTER_1 < PreambleTransMax + 1, then the power ramping count PREAMBLE_TRANSMISSION_POWER_COUNTER is incremented by 1 to obtain PREAMBLE_TRANSMISSION_POWER_COUNTER_1, and the preamble sequence is retransmitted, where the preamble sequence transmission power PREAMBLE_RECEIVED_TARGET_POWER is set to

[0101] Preamble Initial Received Target Power

[0102] +DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_POWER_COUNTER_1 - 1)*PowerRamping Step.

[0103] For the embodiments of the present invention, if the preamble sequence transmission fails, the user equipment can increase the transmission power of the preamble sequence and send the preamble sequence.

[0104] Step 407, loop step 406 until a first preset condition is reached.

[0105] Among them, the first preset condition may include at least one of the following: the maximum number of transmissions for each beam, random access success, the maximum transmit power, or the conditions preset by the user equipment.

[0106] For the embodiment of the present invention, step 407 may also be step 407': looping step 406 until the transmit beam of the preamble sequence changes, and / or the random access resource changes, and / or a preset judgment condition is met.

[0107] Step 408: If the random access fails, the user equipment reselects any beam from other optional beams as the second transmission beam.

[0108] According to the embodiment of the present invention, if the user pre-specifies four beam transmission directions, they are a first beam transmission direction, a second beam transmission direction, a third beam transmission direction, and a fourth beam transmission direction.

[0109] Step 409: The user equipment re-determines the transmit power as the third transmit power.

[0110] Wherein, step 408 may be performed before step 409, and step 409 may be performed before step 408, and step 408 and step 409 may be performed simultaneously, which is not limited in the embodiment of the present invention.

[0111] Step 410: The user equipment resends the preamble sequence to the base station through the third transmission power and the second transmission beam to perform random access.

[0112] For an embodiment of the present invention, if the user equipment previously adopts the first beam transmission direction and gradually increases the transmission power to send a preamble sequence until the first preset condition is reached, then the user equipment can select other beams, such as the second beam transmission direction, and a re-determined transmission power.

[0113] For an embodiment of the present invention, step 408-step 410 may be step 408' (not marked in the figure): if random access fails, execute any one of step 4081' (not marked in the figure), step 4082' (not marked in the figure) and step 4083' (not marked in the figure), and redetermine the transmit power as the third transmit power. After determining the third transmit power, resend the preamble sequence to the base station through the second transmit beam and at least one of the second random access resources and the third transmit power to perform random access.

[0114] in,

[0115] Step 4081', the transmit beam for sending the preamble sequence is changed to the second transmit beam.

[0116] Step 4082': the transmit beam for sending the preamble sequence is changed to the second transmit beam, and the random access resource is changed to the second random access resource.

[0117] Step 4083' The random access resource becomes a second random access resource.

[0118] Alternatively, step 408-step 410 may be step 409' (not marked in the figure): if the random access fails, in any of the following situations, the transmit power is re-determined as the third transmit power, and after the third transmit power is determined, the preamble sequence is resent to the base station through the third transmit power and the second transmit beam and / or the second random access resource for random access:

[0119] The transmission beam for sending the preamble sequence becomes the second transmission beam;

[0120] The transmit beam for sending the preamble sequence is changed to the second transmit beam, and the random access resource is changed to the second random access resource;

[0121] The random access resource becomes the second random access resource.

[0122] Step 411: If the random access fails, the user equipment gradually increases the transmit power of the preamble sequence according to a preset number of fixed power ramp steps, and resends the preamble sequence to the base station according to the increased transmit power and the second transmit beam to perform random access.

[0123] For the embodiment of the present invention, if the preamble sequence fails to be sent, the user equipment resends the preamble sequence to the base station through the second beam transmission direction selected above and gradually increases the transmission power of the preamble sequence based on the transmission power of the last transmission of the preamble sequence.

[0124] Step 412: If the random access fails and the first preset condition is met, then steps 408-411 are looped until the preset judgment condition is met.

[0125] For the embodiment of the present invention, step 412 may be: if random access fails, and the transmit beam of the preamble sequence changes, and / or the random access resource changes, then step 408' and step 411 are looped until a preset judgment condition is met.

[0126] For an embodiment of the present invention, if the second beam transmission direction is used to send a preamble sequence to a base station and the transmission still fails, and the maximum number of transmissions of the second beam transmission direction or the maximum transmission power is reached, the third beam transmission direction is used, and the transmission power of the preamble sequence is gradually increased to send the preamble sequence to the base station. If it fails and the maximum number of transmissions of the third beam transmission direction or the maximum transmission power is reached, the fourth beam transmission direction is used, and the preamble sequence is resent to the base station in accordance with the above-mentioned power increase method until random access is successful or the maximum number of transmissions of the preamble sequence is reached.

[0127] It should be noted that when the user equipment performs the above beam switching operation, it can select a beam from all beams or a subset thereof according to a certain rule, or it can randomly select a beam from all beams or a subset thereof. In the embodiment of the present invention, in the above preamble sequence retransmission process based on power ramping and beam switching, if the preamble sequence is sent successfully, the preamble sequence transmission is stopped and a subsequent random access process is performed, otherwise the preamble sequence is continuously retransmitted until the maximum number of preamble sequence transmission times is reached.

[0128] It should also be noted that in this embodiment of the present invention and all subsequent embodiments of the invention, PREAMBLE_TRANSMISSION_POWER_COUNTER can be replaced by PREAMBLE_POWER_RAMPING_COUNTER, PreambleInitial Received Target Power can be replaced by ra-PreambleInitialReceivedTargetPower, Power Ramping Step can be replaced by ra-PreamblePowerRampingStep, and PreambleTransMax can be replaced by ra-PreambleTx-Max.

[0129] According to the embodiment of the present invention, after the user equipment fails to send a preamble sequence to the base station, the user equipment first increases the transmission power of the preamble sequence, then switches the transmission beam for sending the preamble sequence, and increases the transmission power of the preamble sequence under the switched beam until the preamble sequence is successfully sent to the base station or a preset judgment condition is met, thereby increasing the success probability of the preamble sequence retransmission and further improving the performance of the random access process.

[0130] Embodiment 4

[0131] Another possible implementation of the embodiment of the present invention, based on the embodiment 2, step 409, the user equipment re-determines the transmission power as the third transmission power, includes step 509 shown in the embodiment 4, wherein the operations performed by steps 501-508, 510-512 are similar to the operations performed by steps 401-408, 410-412, which will not be repeated here.

[0132] Step 509: The user equipment re-determines the third transmit power as the first transmit power.

[0133] Specifically, re-determining the third transmit power as the first transmit power includes: resetting the preamble power climbing count to 1, and determining the third transmit power as the power value of the first transmit power according to the reset preamble power climbing count.

[0134] For the embodiments of the present invention, the user equipment performs a beam conversion operation, sets the power ramping count PREAMBLE_TRANSMISSION_POWER_COUNTER to 1, and increments the preamble transmission count PREAMBLE_TRANSMISSION_COUNTER by 1 to obtain the current preamble transmission count value PREAMBLE_TRANSMISSION_COUNTER_2.

[0135] Among them, if

[0136] PREAMBLE_TRANSMISSION_COUNTER_2 < PreambleTransMax + 1, then retransmit the preamble sequence under the new beam, reset PREAMBLE_TRANSMISSION_POWER_COUNTER to 1, keep the two values of Preamble Initial ReceivedTarget Power and DELTA_PREAMBLE unchanged, and the transmission power of the preamble sequence is

[0137] Preamble Initial Received Target Power + DELTA_PREAMBLE

[0138] + (PREAMBLE_TRANSMISSION_POWER_COUNTER - 1) * Power Ramping Step.

[0139] For example, the sum of the initial preamble sequence transmission power Preamble Initial Received Target Power and the transmission power compensation DELTA_PREAMBLE based on the preamble sequence format is P, that is, the first transmission power is P, the fixed power ramping step Power Ramping Step is Δ, and the first transmission beam is beam 0. Then the preamble sequence retransmission flowchart in this case is as Figure 7 shown. Among them, Figure 7 in, the user equipment transmits the preamble sequence at the initial power P on beam 0. After the preamble sequence transmission fails, configure a power ramping mechanism with a step of Δ until the number of times of transmitting the preamble sequence on beam 0 reaches N. If it is necessary to retransmit the preamble sequence again, after the user equipment performs a beam conversion operation, select beam 1, retransmit the preamble sequence at the initial power P on beam 1, and configure the above power ramping mechanism on beam 1 until the beam conversion is performed again or the preamble sequence is successfully transmitted or the maximum preamble sequence transmission times are reached to end this random access process.

[0140] Embodiment 5

[0141] Another possible implementation of the embodiment of the present invention. On the basis shown in Embodiment 3, step 409, where the user equipment re-determines the transmission power as the third transmission power, includes step 609 shown in Embodiment 5, where the operations performed in steps 601-608, 610-612 are similar to those performed in steps 401-408, 410-412. Details are not described herein again.

[0142] Step 609, the user equipment re-determines that the third transmission power is the power for transmitting the preamble sequence when the first preset condition is met.

[0143] Specifically, the step of re-determining the transmission power as the third transmission power specifically includes step 6091 (not marked in the figure): re-determining that the third transmission power is the power for transmitting the preamble sequence when the transmission beam of the preamble sequence changes and / or the random access resource changes.

[0144] Specifically, the step of re-determining the transmission power as the third transmission power specifically includes step 6091' (not marked in the figure): determining that the preamble power ramping counter value remains unchanged, and determining the third transmission power according to the preamble power ramping count.

[0145] For the embodiment of the present invention, the user equipment performs a beam conversion operation, sets the power ramping count PREAMBLE_TRANSMISSION_POWER_COUNTER to remain unchanged, and adds 1 to the preamble transmission count PREAMBLE_TRANSMISSION_COUNTER to obtain the current preamble transmission count value as PREAMBLE_TRANSMISSION_COUNTER_3.

[0146] Where, if

[0147] PREAMBLE_TRANSMISSION_COUNTER_3 < preambleTransMax + 1, then retransmit the preamble sequence under the new beam, and the preamble sequence transmission power PREAMBLE_RECEIVED_TARGET_POWER is set to

[0148] Preamble Initial Received Target Power + DELTA_PREAMBLE

[0149] + (PREAMBLE_TRANSMISSION_POWER_COUNTER - 1) * Power Ramping Step.

[0150] For example, the sum of the initial preamble transmission power Preamble Initial Received Target Power and the transmission power compensation DELTA_PREAMBLE based on the preamble format is P, that is, the first transmission power is P, and the power ramping fixed step Power Ramping Step is Δ. The preamble retransmission flow chart in this case is as follows: Figure 8 As shown, the user equipment uses the initial power P to transmit the preamble sequence in beam 0, and configures a power ramp mechanism with a step size of Δ after the preamble sequence fails to be transmitted. After the number of times the preamble sequence is transmitted in beam 0 reaches N, if the preamble sequence needs to be retransmitted again, the user equipment selects beam 1 after performing a beam switching operation, retransmits the preamble sequence in beam 1 with a power of P+(N-1)Δ, and configures the above power ramp mechanism in beam 1 until the beam switching is performed again or the preamble sequence is successfully transmitted or the maximum number of preamble sequence transmissions is reached, ending the random access process.

[0151] Embodiment 6

[0152] Another possible implementation of the embodiment of the present invention, based on the embodiment 3, step 409, the user equipment re-determines the transmit power as the third transmit power, includes step 709 shown in embodiment 6, wherein the operations performed by steps 701-708, 710-712 are similar to the operations performed by steps 401-408, 410-412, which will not be repeated here.

[0153] Step 709: When the first preset condition is met, a preset number of fixed power increase steps are added to the power of the transmitted preamble sequence, and the power after the preset number of fixed power increase steps is added is used as the third transmission power.

[0154] Specifically, the step of redetermining the transmission power as the third transmission power specifically includes step 7091 (not marked in the figure): based on the power of sending the preamble sequence when the transmit beam of the preamble sequence changes and / or the random access resource changes, increase the power by a preset number of fixed steps, and use the power after increasing the preset number of fixed steps as the third transmission power.

[0155] Specifically, the step of redetermining the transmission power as the third transmission power specifically includes step 7091' (not marked in the figure): based on the preamble sequence climb count when the transmission beam of the preamble sequence changes and / or the random access resource changes, the preamble power climb count is increased by 1, and the third transmission power is determined according to the increased preamble power climb count.

[0156] For the embodiments of the present invention, the user equipment performs a beam conversion operation, and sets the power ramping count PREAMBLE_TRANSMISSION_POWER_COUNTER and the preamble transmission count PREAMBLE_TRANSMISSION_COUNTER to be incremented by 1 respectively, and obtains the power ramping count value PREAMBLE_TRANSMISSION_POWER_COUNTER_2 and the preamble transmission count value PREAMBLE_TRANSMISSION_COUNTER_4 respectively.

[0157] Among them, if

[0158] PREAMBLE_TRANSMISSION_COUNTER_4 < preambleTransMax + 1, the preamble sequence is retransmitted under the new beam, and the preamble sequence transmission power PREAMBLE_RECEIVED_TARGET_POWER is set to PreambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_POWER_COUNTER_2 - 1) * Power Ramping Step.

[0159] For example, the sum of the initial preamble sequence transmission power Preamble Initial Received Target Power and the transmission power compensation DELTA_PREAMBLE based on the preamble sequence format is P, that is, the first transmission power is P, and the power ramping fixed step Power Ramping Step is Δ. Then the flowchart of the preamble sequence retransmission in this case is as Fig. 9 shown. Among them, the user equipment transmits the preamble sequence at the initial power P in beam 0. After the preamble sequence transmission fails, a power ramping mechanism with a step size of Δ is configured. After the number of times of transmitting the preamble sequence in beam 0 reaches N, if the preamble sequence needs to be retransmitted again, the user equipment performs a beam conversion operation and then selects beam 1, and retransmits the preamble sequence in beam 1 with the power P + NΔ, and configures the above power ramping mechanism in beam 1 until a beam conversion is performed again, or the preamble sequence is successfully transmitted, or the maximum number of preamble sequence transmissions is reached, and the random access process ends.

[0160] Specifically, the step of re-determining the transmission power as the third transmission power includes: on the basis of the existing transmission power of the second random access resource, adding a preset number of power ramping fixed steps, and taking the power after adding the preset number of power ramping fixed steps as the third transmission power.

[0161] Specifically, the step of redetermining the transmission power as the third transmission power also includes: based on the existing transmission power of the second random access resource, increasing the preamble power climb count by 1, and determining the third transmission power according to the increased preamble power climb count.

[0162] Embodiment 7

[0163] Another possible implementation method of the embodiment of the present invention, based on the one shown in embodiment, step 205, if the random access fails, the user equipment resends the preamble sequence to the base station according to the received random access preamble sequence retransmission mechanism and the random access preamble sequence retransmission configuration information to perform random access until the preset judgment condition is met, including steps 805-810 shown in embodiment seven, wherein the operations performed in steps 801-804 are similar to the operations performed in steps 201-204, and are not repeated here.

[0164] Step 805: If the random access fails, the user equipment selects any beam from other optional beams as the third transmit beam, and resends the preamble sequence to the base station through the first transmit power and the third transmit beam to perform random access.

[0165] It should be noted that the other optional beams are other optional beams except the beams that have been used in a single cycle.

[0166] According to the embodiment of the present invention, before the user equipment sends the preamble sequence, the user equipment needs to determine PreambleInitial Received Target Power and DELTA_PREAMBLE to determine the first transmission power.

[0167] Among them, the first sending power = Preamble Initial Received Target Power + DELTA_PREAMBLE.

[0168] According to the embodiment of the present invention, before the user equipment sends the preamble sequence, the user equipment sets PREAMBLE_TRANSMISSION_COUNTER to 1 and PREAMBLE_TRANSMISSION_POWER_COUNTER to 1.

[0169] For the embodiments of the present invention, the user equipment receives a random access response within the reception time window of the random access response specified in the system configuration information. Wherein, if no random access response is received within this time window, or the identifier of the preamble sequence carried in the random access response information is different from the identifier corresponding to the preamble sequence sent by the user equipment to the base station, or the identifier of the user equipment carried in the conflict resolution information is different from its corresponding identifier, then the preamble transmission count PREAMBLE_TRANSMISSION_COUNTER is incremented by 1 to obtain the preamble transmission count value PREAMBLE_TRANSMISSION_COUNTER_5.

[0170] Wherein, if

[0171] PREAMBLE_TRANSMISSION_COUNTER_5 = PreambleTransMax + 1, then the maximum number of preamble sequence transmissions is reached, and this random access process is regarded as failed, and this random access process is ended.

[0172] Wherein, if

[0173] PREAMBLE_TRANSMISSION_COUNTER_5 < preambleTransMax + 1, then a transmission beam is reselected and the preamble sequence is retransmitted, wherein the preamble sequence transmission power PREAMBLE_RECEIVED_TARGET_POWER is set to PreambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_POWER_COUNTER - 1) * Power Ramping Step.

[0174] For the embodiments of the present invention, when performing beam conversion and retransmitting the preamble sequence to the base station, the user equipment can select a beam from all beams or a subset thereof according to certain rules, or randomly select a beam from all beams or a subset thereof. In the subsequent random access process, if the user equipment needs to retransmit the preamble sequence again, the above beam conversion mechanism can be repeated, and the preamble sequence is retransmitted using the original power with different beams. For example, if the preamble sequence transmission fails and the value of the current PREAMBLE_TRANSMISSION_COUNTER < PreambleTransMax + 1, then a beam is selected from other unselected optional beams, and the preamble sequence is retransmitted to the base station using the first transmission power.

[0175] Step 806, if the random access fails, loop step 805 until a second preset condition is reached.

[0176] The second preset condition may include at least one of the following: the maximum number of transmissions at the original power, the maximum number of beams, random access success, and a condition set by the user equipment. In an embodiment of the present invention, when the maximum number of transmissions at the original power is reached or the maximum number of beams is reached or other conditions set by the user are reached, the user equipment increases the transmit power, retransmits the preamble sequence, and repeats the above beam switching mechanism at the new transmit power, as shown in steps 807-810.

[0177] For an embodiment of the present invention, when the maximum number of transmissions of the original power is reached or the maximum number of beams or other conditions set by the user equipment is reached, the power ramp count PREAMBLE_TRANSMISSION_POWER_COUNTER+1 is used to obtain the current power ramp count value PREAMBLE_TRANSMISSION_POWER_COUNTER_3, then the current preamble sequence transmit power PREAMBLE_RECEIVED_TARGET_POWER is set to PreambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_POWER_COUNTER_3-1)*Power RampingStep, and the preamble sequence is retransmitted according to the transmit power of the current preamble sequence.

[0178] Step 807: If the random access fails, the user equipment re-determines the transmit power and transmit beam to be the fourth transmit power and the fourth transmit beam respectively.

[0179] Step 808: The user equipment resends the preamble sequence to the base station through the fourth transmit power and the fourth transmit beam to perform random access.

[0180] Step 809: If the random access fails, the user equipment selects any beam from other optional beams, and resends the preamble sequence to the base station through the selected beam to perform random access.

[0181] Step 810: If random access fails and the second preset condition is met, then loop through steps 807 to 809 until the preset judgment condition is met.

[0182] According to the embodiment of the present invention, after the user equipment fails to send a preamble sequence to the base station, it first converts the transmission beam for sending the preamble sequence, and then increases the transmission power of the preamble sequence until the preamble sequence is successfully sent to the base station or a preset judgment condition is met, thereby increasing the success probability of the preamble sequence retransmission and further improving the performance of the random access process.

[0183] Embodiment 8

[0184] Another possible implementation of the embodiment of the present invention, based on the seventh embodiment, step 807, the user equipment re-determines the transmission power and the transmission beam as the fourth transmission power and the fourth transmission beam, includes step 907 shown in the eighth embodiment, wherein the operations performed by steps 901-906 and 908-911 are similar to the operations performed by steps 801-806 and 808-810, which will not be repeated here.

[0185] Step 907: The user equipment increases the transmit power after a preset number of power climbing fixed steps on the basis of the transmit power corresponding to the second preset condition, and determines it as the fourth transmit power, and determines any transmit beam selected from the optional beams as the fourth transmit beam.

[0186] For the embodiment of the present invention, when the user equipment reaches the second preset condition, PREAMBLE_TRANSMISSION_POWER_COUNTER+1 is added to obtain the current power ramp count value PREAMBLE_TRANSMISSION_POWER_COUNTER_4, wherein the fourth transmission input power is the preamble sequence transmit power PREAMBLE_RECEIVED_TARGET_POWER is set to PreambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_POWER_COUNTER_4-1)*Power Ramping Step

[0187] For the embodiment of the present invention, the fourth beam may be the same as the transmit beam used when the preamble sequence is sent to the base station when the second preset condition is met; or may be different from the transmit beam used when the preamble sequence is sent to the base station when the second preset condition is met. This is not limited in the embodiment of the present invention.

[0188] If the fourth beam is the same as the transmission beam used when the preamble sequence is sent to the base station when the second preset condition is met, the preamble sequence can be sent to the base station in the following manner. For example, the sum of the initial preamble sequence transmission power Preamble Initial Received Target Power and the transmission power compensation DELTA_PREAMBLE based on the preamble sequence format is P, and the power ramping fixed step Power Ramping Step is Δ, then the preamble sequence retransmission flow chart in this case is as follows: Fig.10As shown. The user equipment configures three transmission beam directions, uses the initial power P to transmit the preamble sequence in beam 0, configures the beam switching mechanism after the preamble sequence fails to be sent, and after using power P to send the retransmitted preamble sequence in beam 1 and beam 2, if the preamble sequence needs to be retransmitted again, the user equipment continues to use beam 2 after performing a power ramp-up operation, retransmits the preamble sequence in beam 2 with power P+Δ, and configures the above beam switching mechanism at power P+Δ until the power ramp-up is performed again or the preamble sequence is successfully sent or the maximum number of preamble sequence transmissions is reached, ending the random access process.

[0189] If the fourth beam is different from the transmission beam used when the preamble sequence is sent to the base station when the second preset condition is met, the preamble sequence can be sent to the base station in the following manner. For example, the sum of Preamble InitialReceived Target Power and DELTA_PREAMBLE is P, and Power Ramping Step is Δ. The preamble sequence retransmission flow chart in this case is as follows: Fig.11 As shown. The user equipment configures three beam directions, uses the initial power P to transmit the preamble sequence in beam 0, configures the beam switching mechanism after the preamble sequence fails to be sent, and after using power P to send the retransmitted preamble sequence in beam 1 and beam 2, if the preamble sequence needs to be retransmitted again, the user uses a different beam after the power climb operation, retransmits the preamble sequence in beam 0 with power P+Δ, and configures the above beam switching mechanism at power P+Δ until the power climb is performed again or the preamble sequence is successfully sent or the maximum number of preamble sequence transmissions is reached, ending the random access process.

[0190] It should be noted that in the above-mentioned preamble sequence retransmission process based on beam switching and power ramping, if the preamble sequence is sent successfully, the preamble sequence transmission is stopped and the subsequent random access process is performed, otherwise the preamble sequence is continuously retransmitted until the maximum number of preamble sequence transmission times is reached.

[0191] Embodiment 9

[0192] Another possible implementation method of the embodiment of the present invention, based on the one shown in embodiment, step 205, if the random access fails, the user equipment resends the preamble sequence to the base station according to the received random access preamble sequence retransmission mechanism and the random access preamble sequence retransmission configuration information to perform random access until the preset judgment condition is met, including steps 1005-1008 shown in embodiment nine, wherein the operations performed in steps 1001-1004 are similar to the operations performed in steps 201-204, and are not repeated here.

[0193] Step 1005: If the random access fails, the user equipment determines the fifth transmission power.

[0194] The fifth transmission power is a power increase fixed step size that increases a preset number of steps on the first transmission power.

[0195] According to the embodiment of the present invention, if the user equipment fails to send the preamble sequence to the base station, the transmit power is increased by a preset number of fixed power ramp steps as the fifth transmit power.

[0196] According to the embodiment of the present invention, before the user equipment sends the preamble sequence, the user equipment needs to determine PreambleInitial Received Target Power and DELTA_PREAMBLE to determine the first transmission power.

[0197] Among them, the first sending power = Preamble Initial Received Target Power + DELTA_PREAMBLE.

[0198] According to the embodiment of the present invention, before the user equipment sends the preamble sequence, the user equipment sets PREAMBLE_TRANSMISSION_COUNTER to 1 and PREAMBLE_TRANSMISSION_POWER_COUNTER to 1.

[0199] In the embodiment of the present invention, the user equipment receives the random access response within the random access response receiving time window specified in the system configuration information. If no random access response is received within the time window, or the random access response

[0200] If the identifier of the preamble sequence carried in the information is different from the identifier corresponding to the preamble sequence sent by the user equipment to the base station, or the identifier of the user equipment carried in the conflict resolution information is different from its corresponding identifier, the preamble transmission count PREAMBLE_TRANSMISSION_COUNTER is increased by 1, and the current sign-in transmission count value is PREAMBLE_TRANSMISSION_COUNTER_6.

[0201] Among them, if

[0202] If PREAMBLE_TRANSMISSION_COUNTER_6=PreambleTransMax+1, the maximum number of preamble sequence transmissions is reached, the random access process is regarded as a failure, and the random access process is terminated.

[0203] Among them, if

[0204] If PREAMBLE_TRANSMISSION_COUNTER_6 < PreambleTransMax + 1, increment PREAMBLE_TRANSMISSION_POWER_COUNTER by 1 to obtain the current power transmission count value PREAMBLE_TRANSMISSION_POWER_COUNTER_5, and retransmit the preamble sequence, where PREAMBLE_RECEIVED_TARGET_POWER is set to PreambleInitialReceivedTargetPower + DELTA_PREAMBLE + (PREAMBLE_TRANSMISSION_POWER_COUNTER_5 - 1) * Power Ramping Step.

[0205] For the embodiments of the present invention, during the process of retransmitting the preamble sequence, if the user equipment needs to retransmit the preamble sequence again, the above power ramping and beam switching mechanisms can be repeated, increasing the transmission power of the preamble sequence by a preset number of steps and retransmitting the preamble sequence on each beam in turn.

[0206] Step 1006: The user equipment retransmits the preamble sequence to the base station in turn through each transmitting beam in the optional beams according to the fifth transmission power for random access.

[0207] For the embodiments of the present invention, if the preamble sequence transmission fails, the user equipment can first increase the transmission power of the preamble sequence by a preset number of power ramping steps, and retransmit the preamble sequence to the base station in turn through each transmitting beam according to the increased transmission power.

[0208] Step 1007: If the random access fails, the user equipment will re - determine the transmission power as the sixth transmission power and retransmit the preamble sequence to the base station in turn through each transmitting beam in the optional beams.

[0209] Wherein, the sixth transmission power is the transmission power corresponding to the previous random access failure plus the preset number of power ramping fixed steps.

[0210] Step 1008: Loop step 1007 until a preset judgment condition is met.

[0211] For example, if the sum of Preamble Initial Received Target Power and DELTA_PREAMBLE is P and Power Ramping Step is Δ, the flowchart of preamble sequence retransmission in this case is as Fig.12As shown. The user equipment configures three beam directions, uses P to transmit the preamble sequence in beam 0, and configures the power climbing mechanism and beam switching mechanism at the same time after the preamble sequence fails to be sent, and retransmits the preamble sequence in beam 0, beam 1 and beam 2 with power P+Δ in sequence. If the preamble sequence needs to be retransmitted again, the above power climbing mechanism and beam switching mechanism are continuously configured until the preamble sequence is successfully sent or the maximum number of preamble sequence transmissions is reached, ending the random access process.

[0212] It should be noted that when the user equipment performs the above-mentioned beam switching operation, it can select one or more beams from all beams or their subsets according to certain rules, or it can randomly select one or more beams from all beams or their subsets. In the embodiment of the present invention, in the above-mentioned preamble sequence retransmission process based on power ramping and beam switching, if the preamble sequence is sent successfully, the preamble sequence transmission is stopped and the subsequent random access process is performed, otherwise the preamble sequence is continuously retransmitted until the maximum number of preamble sequence transmission times is reached.

[0213] For the embodiment of the present invention, after the preamble sequence transmission fails, the user equipment increases the transmission power of the preamble sequence and resends the preamble sequence to the base station through each beam in sequence. If the preamble sequence transmission fails, the transmission power of the preamble sequence is increased again, and the preamble sequence is still resent to the base station through each beam in sequence, thereby increasing the success probability of the preamble sequence retransmission and further improving the performance of the random access process.

[0214] Embodiment 10

[0215] Another possible implementation method of the embodiment of the present invention, based on the second embodiment, step 305, if the random access fails, the user equipment increases the transmit power of the preamble sequence according to a preset number of power ramp steps to perform random access; and / or, step 306, if the transmit beam of the preamble sequence changes, and / or the random access resource changes, the user equipment increases the transmit power of the preamble sequence according to a preset number of powers to perform random access until the preset judgment condition is met, including steps 1005-1012 shown in embodiment ten, wherein the operations performed in steps 1001-1004 are similar to the operations performed in steps 301-304, and are not repeated here.

[0216] Step 1105: If the random access fails, the user equipment determines the seventh transmit power, and resends the preamble sequence to the base station through the first random access resource and the seventh transmit power.

[0217] The seventh transmission power is a power climbing fixed step size that increases a preset number of steps on the first transmission power, and the first transmission power is the transmission power of the first transmission of the preamble sequence.

[0218] For the embodiment of the present invention, before the user equipment sends the preamble sequence, the user equipment needs to determine the initial preamble target received power (full name in English: Preamble Initial Received Target Power) and the transmit power compensation based on the preamble sequence format (full name in English: DELTA_PREAMBLE) to determine the first transmit power.

[0219] Among them, the first sending power = Preamble Initial Received Target Power + DELTA_PREAMBLE.

[0220] For the embodiment of the present invention, before the user equipment sends the preamble sequence, the user equipment sets the preamble transmission count (full name in English: PREAMBLE_TRANSMISSION_COUNTER) to 1 and the power ramp count (full name in English: PREAMBLE_TRANSMISSION_POWER_COUNTER) to 1.

[0221] Step 1106: If the random access fails, the user equipment increases the preamble sequence transmit power according to a preset number of fixed power ramp steps, and resends the preamble sequence to the base station using the increased preamble sequence transmit power and the first random access resource.

[0222] For the embodiment of the present invention, the user equipment receives the random access response within the random access response receiving time window specified in the system configuration information. If no random access response is received within the time window, or the identifier of the preamble sequence carried in the random access response information is different from the identifier corresponding to the preamble sequence sent by the user equipment to the base station, or the identifier of the user equipment carried in the conflict resolution information is different from the identifier corresponding to the preamble sequence, the preamble transmission count PREAMBLE_TRANSMISSION_COUNTER is increased by 1 to obtain the current preamble transmission count value PREAMBLE_TRANSMISSION_COUNTER_7.

[0223] Among them, if

[0224] If PREAMBLE_TRANSMISSION_COUNTER_7=preambleTransMax+1, the maximum number of preamble sequence transmissions is reached, and this random access process is regarded as a failure, and the random access process is terminated.

[0225] Among them, if

[0226] PREAMBLE_TRANSMISSION_COUNTER_7 < preambleTransMax + 1, then increment the power ramping count PREAMBLE_TRANSMISSION_POWER_COUNTER by 1 to obtain PREAMBLE_TRANSMISSION_POWER_COUNTER_6, and retransmit the preamble sequence, where the preamble transmission power PREAMBLE_RECEIVED_TARGET_POWER is set to

[0227] Preamble Initial Received Target Power

[0228] +DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_POWER_COUNTER_6 - 1)*PowerRamping Step.

[0229] For the embodiments of the present invention, if the preamble sequence transmission fails, the user equipment can increase the transmission power of the preamble sequence and transmit the preamble sequence.

[0230] Step 1107: Loop step 1106 until a third preset condition is reached.

[0231] Among them, the third preset condition may include at least one of the following: the maximum number of transmissions of each random access resource, random access success, maximum transmit power, or a condition preset by the user equipment.

[0232] Among them, the condition preset by the user equipment may be: the transmit power reaching the third preset condition is greater than the transmit power when using a certain other random access resource for preamble sequence transmission.

[0233] Step 1108: If the random access fails, the user equipment reselects a random access resource from other optional random access resources as the second random access resource.

[0234] For the embodiments of the present invention, if four random access resources are specified in advance, namely the first random access resource, the second random access resource, the third random access resource, and the fourth random access resource.

[0235] Step 1109: The user equipment re - determines the transmission power as the eighth transmission power.

[0236] For the example of the present invention, the eighth transmission power can be the same as the first transmission power, or the same as the transmission power when the third preset condition is met, or on the basis of the transmission power that meets the third preset condition, a preset number of power climb fixed steps are added, and the power after the preset number of power climb fixed steps are increased is used as the eighth transmission power, or on the basis of the existing transmission power of the second random access resource, a preset number of power climb fixed steps are added, and the power after the preset number of power climb fixed steps are increased is used as the eighth transmission power.

[0237] Specifically, when the eighth transmission power is the same as the first transmission power, the preamble power climbing count is reset to 1, and the eighth transmission power is determined to be the power value of the first transmission power according to the reset preamble power climbing count; when the eighth transmission power is the same as the transmission power when the third preset condition is reached, the preamble power climbing count value remains unchanged, and the eighth transmission power is determined according to the preamble power climbing count; when the eighth transmission power is the transmission power reaching the third preset condition, the preset number of power climbing fixed steps is increased, and the preamble power climbing count is increased by 1 on the basis of the preamble power climbing count when the third preset condition is reached, and the eighth transmission power is determined according to the increased preamble power climbing count. Among them, step 1108 can be executed before step 1109, step 1109 can also be executed before step 1108, and step 1108 and step 1109 can be executed simultaneously. It is not limited in the embodiments of the present invention.

[0238] Step 1110: The user equipment resends the preamble sequence to the base station by using the eighth transmission power and the second random access resource to perform random access.

[0239] For an embodiment of the present invention, if the user equipment previously uses the first random access resource and gradually increases the transmission power to send a preamble sequence until the third preset condition is reached, then the user equipment can select other random access resources, such as the second random access resource, and the re-determined transmission power.

[0240] For an embodiment of the present invention, step 1108-step 1110 may be step 1108' (not marked in the figure): if random access fails, execute any one of step 11081' (not marked in the figure), step 11082' (not marked in the figure) and step 11083' (not marked in the figure), and redetermine the transmit power as the third transmit power. After determining the third transmit power, resend the preamble sequence to the base station through the second transmit beam and at least one of the second random access resources and the third transmit power to perform random access.

[0241] in,

[0242] Step 11081', the transmit beam for sending the preamble sequence is changed to the second transmit beam.

[0243] Step 11082': the transmit beam for sending the preamble sequence is changed to the second transmit beam, and the random access resource is changed to the second random access resource.

[0244] Step 11083' The random access resource becomes a second random access resource.

[0245] The third transmit power may be the eighth transmit power.

[0246] Alternatively, step 1108-step 1110 may be step 1109' (not marked in the figure): if random access fails, in any of the following situations, the transmit power is re-determined as the third transmit power, and after determining the third transmit power, the preamble sequence is resent to the base station through the third transmit power and the second transmit beam and / or the second random access resource for random access:

[0247] The transmission beam for sending the preamble sequence becomes the second transmission beam;

[0248] The transmit beam for sending the preamble sequence is changed to the second transmit beam, and the random access resource is changed to the second random access resource;

[0249] The random access resource becomes the second random access resource.

[0250] Step 1111: If the random access fails, the user equipment gradually increases the transmit power of the preamble sequence according to a preset number of fixed power ramp steps, and resends the preamble sequence to the base station according to the increased transmit power and the second random access resource to perform random access.

[0251] For the embodiment of the present invention, if the preamble sequence fails to be sent, the user equipment resends the preamble sequence to the base station through the second random access resource selected above and gradually increases the transmit power of the preamble sequence based on the transmit power of the last transmit preamble sequence.

[0252] Step 1112: If random access fails and the third preset condition is met, loop steps 1108-1111 until the preset judgment condition is met.

[0253] For the embodiment of the present invention, step 1112 may be: if random access fails, and the transmit beam of the preamble sequence changes, and / or the random access resource changes, then steps 1108' to 1111 are looped until a preset judgment condition is met.

[0254] For an embodiment of the present invention, if a second random access resource is used to send a preamble sequence to a base station, but the transmission still fails and the maximum number of transmissions of the second random access resource or the maximum transmission power is reached, a third random access resource is used, and the transmission power of the preamble sequence is gradually increased to send the preamble sequence to the base station. If the transmission fails and the maximum number of transmissions of the third random access resource or the maximum transmission power is reached, a fourth random access resource is used, and the preamble sequence is resent to the base station in accordance with the above-mentioned power increase method until random access is successful or the maximum number of transmissions of the preamble sequence is reached.

[0255] It should be noted that when the user equipment performs the above random access resource reselection operation, it can select a resource from all random access resources or a subset thereof according to a certain rule, or it can randomly select a resource from all random access resources or a subset thereof. In the embodiment of the present invention, in the above preamble sequence retransmission process based on power ramping and random access resource reselection, if the preamble sequence is successfully sent, the preamble sequence transmission is stopped and a subsequent random access process is performed, otherwise the preamble sequence is continuously retransmitted until the maximum number of preamble sequence transmission times is reached.

[0256] According to the embodiment of the present invention, after the user equipment fails to send a preamble sequence to the base station, the user equipment first increases the transmission power of the preamble sequence, then reselects the random access resource, and increases the transmission power of the preamble sequence under the reselected random access resource until the preamble sequence is successfully sent to the base station or a preset judgment condition is met, thereby improving the success probability of the preamble sequence retransmission and further improving the performance of the random access process.

[0257] An embodiment of the present invention provides a user equipment, such as Fig.13 As shown, the user equipment includes: a receiving module 1201 and a sending module 1202; wherein,

[0258] The receiving module 1201 is used to receive system configuration information sent by a base station.

[0259] The system configuration information includes: a random access preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information.

[0260] The sending module 1202 is used to send a preamble sequence to a base station for random access.

[0261] The sending module 1202 is further configured to resend the preamble sequence to the base station for random access when random access fails according to the received random access preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information, until a preset judgment condition is met.

[0262] An embodiment of the present invention provides a user equipment. Compared with the prior art, in the embodiment of the present invention, the base station determines system configuration information and sends the system configuration information to the user equipment. Then the user equipment sends a preamble sequence to perform random access. When the random access fails, the user equipment resends the preamble sequence to the base station according to the received random access preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information to perform random access until a preset judgment condition is met, that is, the base station can send the preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information to the user equipment, so that after the random access fails, the user equipment retransmits the preamble sequence according to the above-mentioned preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information to achieve random access, so that the user equipment can retransmit the preamble sequence according to the preamble sequence retransmission scheme. An embodiment of the present invention provides a base station, such as Fig.14 As shown, the base station includes: a determination module 1301 and a sending module 1302; wherein,

[0263] The determination module 1301 is used to determine system configuration information.

[0264] The sending module 1302 is used to send the system configuration information to the user equipment.

[0265] The system configuration information includes: a random access preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information.

[0266] An embodiment of the present invention provides a base station. Compared with the prior art, in the embodiment of the present invention, the base station determines system configuration information and sends the system configuration information to a user device, and then the user device sends a preamble sequence to perform random access. When the random access fails, the user device resends the preamble sequence to the base station according to the received random access preamble sequence retransmission mechanism and random access preamble sequence retransmission configuration information to perform random access until a preset judgment condition is met, that is, the base station can send the preamble sequence retransmission mechanism and the random access preamble sequence retransmission configuration information to the user device, so that after the random access fails, the user device retransmits the preamble sequence according to the above-mentioned preamble sequence retransmission mechanism and the random access preamble sequence retransmission configuration information to achieve random access, so that the user device can retransmit the preamble sequence according to the preamble sequence retransmission scheme.

[0267] The user equipment and base station provided in the embodiment of the present invention can implement the method embodiment provided above. For the specific function implementation, please refer to the description in the method embodiment, which will not be repeated here. The method, user equipment and base station for retransmitting the preamble sequence provided in the embodiment of the present invention can be applied to resend the preamble sequence to the base station for random access after the preamble sequence fails to be sent. But it is not limited to this.

[0268] It will be appreciated by those skilled in the art that the present invention includes devices for performing one or more of the operations described in the present application. These devices may be specially designed and manufactured for the desired purpose, or may include known devices in general-purpose computers. These devices have computer programs stored therein, which are selectively activated or reconfigured. Such computer programs may be stored in a device (e.g., computer) readable medium or in any type of medium suitable for storing electronic instructions and coupled to a bus, respectively, the computer readable medium including but not limited to any type of disk (including floppy disk, hard disk, optical disk, CD-ROM, and magneto-optical disk), ROM (Read-Only Memory), RAM (Random Access Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or optical card. That is, the readable medium includes any medium that stores or transmits information in a readable form by a device (e.g., computer).

[0269] Those skilled in the art will appreciate that each block in these structure diagrams and / or block diagrams and / or flow charts and combinations of blocks in these structure diagrams and / or block diagrams and / or flow charts can be implemented using computer program instructions. Those skilled in the art will appreciate that these computer program instructions can be provided to a general-purpose computer, a professional computer, or a processor of other programmable data processing methods to implement, thereby executing the scheme specified in the block or multiple blocks of the structure diagram and / or block diagram and / or flow chart disclosed in the present invention through the processor of the computer or other programmable data processing method.

[0270] Those skilled in the art will appreciate that the various operations, methods, steps, measures, and schemes discussed in the present invention may be alternated, modified, combined, or deleted. Further, other steps, measures, and schemes in the various operations, methods, and schemes discussed in the present invention may also be alternated, modified, rearranged, decomposed, combined, or deleted. Further, the steps, measures, and schemes in the prior art that are similar to those disclosed in the present invention may also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0271] The above descriptions are only some embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method performed by a user equipment in a wireless communication system, characterized in that: The method comprises: Performing a first random access preamble sequence transmission of a random access procedure; If no random access response including a random access preamble sequence identifier matching the identifier of the first random access preamble sequence is received within the random access response window, increasing a preamble transmission counter for the random access procedure; determining a preamble target received power for a second random access preamble transmission according to a preamble power climb counter, wherein the preamble power climb counter is maintained if a transmission beam used for the second random access preamble transmission is changed compared to a transmission beam used for the first random access preamble transmission; The second random access preamble sequence transmission is performed according to the preamble target received power.

2. The method according to claim 1, characterized in that The increasing the preamble transmission counter for the random access procedure includes increasing the preamble transmission counter by 1.

3. The method according to claim 1, characterized in that If the transmission beam used for the second random access preamble transmission is not changed compared to the transmission beam used for the first random access preamble transmission, the preamble power ramp-up counter is increased.

4. The method according to claim 3, characterized in that The increasing the leading power climbing counter includes adding 1 to the leading power climbing counter.

5. The method according to claim 1, characterized in that If a physical random access channel (PRACH) resource used for the second random access preamble transmission is changed compared to a PRACH resource used for the first random access preamble transmission, the preamble power ramp-up counter is maintained.

6. The method according to claim 3, characterized in that If the transmission beam used for the second random access preamble transmission is not changed compared to the transmission beam used for the first random access preamble transmission, and the PRACH resource used for the second random access preamble transmission is not changed compared to the PRACH resource used for the first random access preamble transmission, the preamble power climb counter is increased by 1.

7. The method according to claim 1, characterized in that The pilot target received power is determined based on the following expression: Leading target receiving power = {initial leading target power + transmitting power compensation + (leading power climbing counter - 1) Leading power ramp step length}.

8. The method according to any one of claims 1 to 7, characterized in that When random access is initiated, it also includes: Set the leading transmission counter to 1; Set the leading power ramp counter to 1.

9. A method performed by a base station in a wireless communication system, characterized in that: The method comprises: Receiving a first random access preamble sequence of a random access process sent by a user equipment; receiving a second random access preamble sequence sent by the user equipment according to the preamble target received power; Wherein, if a random access response including a random access preamble sequence identifier matching the identifier of the first random access preamble sequence within the random access response window is not received by the user equipment, a preamble transmission counter for the random access process is increased; Wherein, the leading target received power is determined according to the leading power climbing counter; Wherein, if the transmission beam used for the second random access preamble sequence transmission is changed compared to the transmission beam used for the first random access preamble sequence transmission, the preamble power climbing counter is maintained.

10. The method according to claim 9, characterized in that The increasing of the preamble transmission counter includes increasing the preamble transmission counter by 1.

11. The method according to claim 9, characterized in that If the transmission beam used for the second random access preamble transmission is not changed compared to the transmission beam used for the first random access preamble transmission, the preamble power ramp-up counter is increased.

12. The method according to claim 11, characterized in that The leading power climbing counter increases, including the leading power climbing counter increases by 1.

13. The method according to claim 9, characterized in that If the PRACH resource used for the second random access preamble transmission is changed compared to the PRACH resource used for the first random access preamble transmission, the preamble power ramp-up counter is maintained.

14. The method according to claim 11, characterized in that If the transmission beam used for the second random access preamble transmission is not changed compared to the transmission beam used for the first random access preamble transmission, and the PRACH resource used for the second random access preamble transmission is not changed compared to the PRACH resource used for the first random access preamble transmission, the preamble power climb counter is increased by 1.

15. The method according to claim 9, characterized in that The pilot target received power is determined based on the following expression: Leading target receiving power = {initial leading target power + transmitting power compensation + (leading power climbing counter - 1) Leading power ramp step length}.

16. The method according to any one of claims 9 to 15, characterized in that When random access is started, the preamble transmission counter is set to 1 and the preamble power ramp-up counter is set to 1.

17. A user equipment, characterized in that: It includes: a transceiver configured to transmit and receive signals; The processor is configured as: Performing a first random access preamble sequence transmission of a random access procedure; If no random access response including a random access preamble sequence identifier matching the identifier of the first random access preamble sequence is received within the random access response window, increasing a preamble transmission counter for the random access procedure; determining a preamble target received power for a second random access preamble transmission according to a preamble power climb counter, wherein the preamble power climb counter is maintained if a transmission beam used for the second random access preamble transmission is changed compared to a transmission beam used for the first random access preamble transmission; The second random access preamble sequence transmission is performed according to the preamble target received power.

18. The user equipment according to claim 17, characterized in that The increasing the preamble transmission counter for the random access procedure includes increasing the preamble transmission counter by 1.

19. The user equipment according to claim 17, characterized in that If the transmission beam used for the second random access preamble transmission is not changed compared to the transmission beam used for the first random access preamble transmission, the preamble power ramp-up counter is increased.

20. The user equipment according to claim 19, characterized in that The increasing the leading power climbing counter includes increasing the leading power climbing counter by 1.

21. The user equipment according to claim 17, characterized in that If the PRACH resource used for the second random access preamble transmission is changed compared to the PRACH resource used for the first random access preamble transmission, the preamble power ramp-up counter is maintained.

22. The user equipment according to claim 19, characterized in that If the transmission beam used for the second random access preamble transmission is not changed compared to the transmission beam used for the first random access preamble transmission, and the PRACH resource used for the second random access preamble transmission is not changed compared to the PRACH resource used for the first random access preamble transmission, the preamble power climb counter is increased by 1.

23. The user equipment according to claim 17, characterized in that The pilot target received power is determined based on the following expression: Leading target receiving power = {initial leading target power + transmitting power compensation + (leading power climbing counter - 1) Leading power ramp step length}.

24. The user equipment according to any one of claims 17 to 23, characterized in that: When random access is started, the preamble transmission counter is set to 1, and the preamble power ramp-up counter is set to 1.

25. A base station, characterized in that: include: a transceiver configured to transmit and receive signals; The processor is configured as: Receiving a first random access preamble sequence of a random access process sent by a user equipment; receiving a second random access preamble sequence sent by the user equipment according to the preamble target received power; Wherein, if a random access response including a random access preamble sequence identifier matching the identifier of the first random access preamble sequence within the random access response window is not received by the user equipment, a preamble transmission counter for the random access process is increased; Wherein, the leading target received power is determined according to the leading power climbing counter; Wherein, if the transmission beam used for the second random access preamble sequence transmission is changed compared to the transmission beam used for the first random access preamble sequence transmission, the preamble power climbing counter is maintained.

26. The base station according to claim 25, characterized in that The increasing of the preamble transmission counter includes increasing the preamble transmission counter by 1.

27. The base station according to claim 25, characterized in that If the transmission beam used for the second random access preamble transmission is not changed compared to the transmission beam used for the first random access preamble transmission, the preamble power ramp-up counter is increased.

28. The base station according to claim 27, characterized in that The leading power climbing counter increases, including the leading power climbing counter increases by 1.

29. The base station according to claim 25, characterized in that If the PRACH resource used for the second random access preamble transmission is changed compared to the PRACH resource used for the first random access preamble transmission, the preamble power ramp-up counter is maintained.

30. The base station according to claim 27, characterized in that If the transmission beam used for the second random access preamble transmission is not changed and the PRACH resource used for the second random access preamble transmission is not changed compared to the PRACH resource used for the first random access preamble transmission, the preamble power climb counter is increased by 1.

31. The base station according to claim 25, characterized in that The pilot target received power is determined based on the following expression: Leading target receiving power = {initial leading target power + transmitting power compensation + (leading power climbing counter - 1) Leading power ramp step length}.

32. The base station according to any one of claims 25 to 31, characterized in that: When random access is started, the preamble transmission counter is set to 1 and the preamble power ramp-up counter is set to 1.

33. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method described in any one of claims 1 to 8 or the method described in any one of claims 9 to 16 is implemented.

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