Random access method, method for configuring random access information and related equipment

Abstract

Provided in an embodiment of the present invention are a random access method, a method for configuring random access information, and a related device, the random access method comprising: when random access is performed based on a determined uplink and the random access fails, if a switching condition of the uplink is satisfied, switching the uplink; and performing random access based on the switched uplink. According to the random access method provided by the embodiment of the invention, when the random access attempt fails, the terminal can timely select the uplink with better channel quality to carry out the re-attempt of the random access process, thereby reducing the time delay of the random access and improving the overall performance of the system.

Description

[0001] This application is a divisional application of the invention patent application with application number "201810027186.8", application date of January 11, 2018, and invention name of "Random access method, method for configuring random access information and related equipment". Technical Field

[0002] The present invention relates to the field of wireless communication technology, and in particular to a random access method, a method for configuring random access information, and related equipment. Background Art

[0003] The rapid development of the information industry, particularly the growing demand from the mobile internet and the Internet of Things (IoT), presents unprecedented challenges to future mobile communications technology. For example, according to the International Telecommunication Union (ITU) report ITU-R M.[IMT.BEYOND 2020.TRAFFIC], mobile traffic is projected to increase nearly 1,000-fold by 2020 compared to 2010 (the 4G era), with the number of connected user devices expected to exceed 17 billion. As massive numbers of IoT devices gradually penetrate mobile communication networks, the number of connected devices will be even more staggering. To meet this unprecedented challenge, the communications industry and academia have launched extensive research on fifth-generation mobile communications technology (5G), with a view to the 2020s. The ITU report ITU-R M.[IMT.VISION] discusses the framework and overall goals of future 5G, detailing the demand outlook, application scenarios, and key performance indicators for 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 improvements in system throughput, consistent user experience, scalability to support the IoT, latency, energy efficiency, cost, network flexibility, support for emerging services, and flexible spectrum utilization.

[0004] The random access process is a crucial step in establishing connections between terminals and base stations within a system. In 5G, since deployed systems may include supplementary uplinks (used to improve 5G system access performance or coverage), during the random access process, the system configures random access channel configuration information for both the 5G system's uplink and supplementary uplink. This includes information about random access channel time-frequency resources, random access preamble sequences, and the mapping between random access opportunities and downlink signals. Furthermore, when performing uplink access, the terminal can choose to use either the 5G system's uplink or the supplementary uplink for random access based on measurement results.

[0005] When the system has a supplementary uplink, the existing random access preamble sequence transmission process can be briefly described as follows: The terminal receives random access configuration information carried by the Master Information Block (MIB) carried by the broadcast channel or the Remaining Minimum System Information (RMSI) indicated in the Master Information Block, as well as the threshold information for selecting the uplink; then, the terminal determines whether to select the supplementary uplink based on the Reference Signal Received Power (RSRP) of the 5G system downlink, that is, if the RSRP is less than the aforementioned threshold information, the supplementary uplink is selected to send the random access preamble sequence; otherwise, the uplink of the 5G system is selected to send the random access preamble sequence; then, the terminal determines the random access channel time-frequency resources according to the random access channel configuration information, and selects the preamble sequence according to the random access preamble sequence configuration information; finally, the terminal sends the preamble sequence.

[0006] However, in existing 5G technologies, if the system selects the uplink of the 5G system based on RSRP, or uses a supplementary uplink to send a random access preamble sequence, subsequent random access retries will also be performed on the selected uplink, which is very likely to cause subsequent random access processes to continue to fail due to uplink channel quality issues, affecting system performance and, in turn, the terminal's access experience. Summary of the Invention

[0007] The present invention aims to solve at least one of the above technical deficiencies, in particular the technical defect that subsequent random access retries continue to fail on the selected uplink.

[0008] According to one aspect, an embodiment of the present invention provides a random access method, including: When random access is performed based on the determined uplink and the random access fails, if the uplink switching condition is met, switching the uplink; Random access is performed based on the uplink after switching.

[0009] According to another aspect, an embodiment of the present invention further provides a method for configuring random access information, including: Determining relevant configuration information for performing random access in at least two uplinks respectively, wherein the relevant configuration information includes information for performing switching between the at least two uplinks; Send the relevant configuration information.

[0010] According to another aspect, an embodiment of the present invention further provides a terminal device, including: A switching module, configured to, when random access is performed based on the determined uplink and the random access fails, switch the uplink if a switching condition of the uplink is met; The access module is used for performing random access based on the uplink after switching.

[0011] According to another aspect, an embodiment of the present invention further provides a base station, including: a determining module, configured to determine relevant configuration information for performing random access in at least two uplinks, respectively, wherein the relevant configuration information includes information for performing switching between the at least two uplinks; The sending module is used to send the relevant configuration information.

[0012] According to another aspect, an embodiment of the present invention further provides a terminal device, including: a processor; and The memory is configured to store machine-readable instructions, which, when executed by the processor, enable the processor to perform the above-mentioned random access method.

[0013] According to another aspect, an embodiment of the present invention further provides a base station, including: processor; and The memory is configured to store machine-readable instructions, which, when executed by the processor, enable the processor to perform the above-mentioned method for configuring random access information.

[0014] An embodiment of the present invention provides a random access method. When random access is performed based on a determined uplink and the random access fails, if the uplink switching condition is met, the link is switched. Therefore, when the random access process fails, it is timely judged whether the uplink switching condition is met to determine whether it is possible to switch to an uplink with better channel conditions for random access. Moreover, when the uplink switching condition is met, the link is switched, which provides a prerequisite for subsequent random access based on the switched link. Random access is performed based on the switched uplink, so that when the random access attempt fails, the terminal can promptly select an uplink with better channel quality to retry the random access process, and perform random access based on the switched uplink, thereby reducing the delay of random access and improving the overall performance of the system.

[0015] An embodiment of the present invention provides a method for configuring random access information, determining relevant configuration information for performing random access in at least two uplinks, respectively, wherein the relevant configuration information includes information for switching between at least two uplinks, providing a prerequisite guarantee for a terminal to perform random access and switching on multiple uplinks; sending relevant configuration information so that when performing random access, the terminal can perform corresponding random access on multiple uplinks according to the relevant configuration information.

[0016] Additional aspects and advantages of the present invention will be set forth in part in the following description, will become apparent from the following description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 1 is a flow chart of a random access method according to an embodiment of the present invention; Figure 2 1 is a flow chart of a random access method according to another embodiment of the present invention; Figure 3 Schematic diagram of the basic process of a random access method according to an embodiment of the present invention; Figure 4 A schematic diagram of the basic structure of a terminal device according to another embodiment of the present invention; Figure 5 A schematic diagram of the basic structure of a base station according to another embodiment of the present invention; Figure 6 The block diagram is a computing system that can be used to implement the base station or user equipment disclosed in the embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following describes embodiments of the present invention in detail, 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0019] It will be understood by those skilled in the art that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the description 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, "connected" or "coupled" as used herein may include wireless connections or wireless couplings. The term "and / or" used herein includes all or any units and all combinations of one or more associated listed items.

[0020] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which this invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless specifically defined as such, will not be interpreted in an idealized or overly formal sense.

[0021] Those skilled in the art will appreciate that the terms "terminal" and "terminal device" as used herein include both devices that are wireless signal receivers, i.e., devices that only have wireless signal receivers without transmission capabilities, and devices that have receiving and transmitting hardware capable of two-way communication over a two-way communication link. Such devices may include: cellular or other communication devices with single-line displays, multi-line displays, or cellular or other communication devices without multi-line displays; PCS (Personal Communications Service) devices that may combine voice, data processing, fax, and / or data communication capabilities; PDAs (Personal Digital Assistants) that 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; and conventional laptop and / or palmtop computers or other devices that have and / or include a radio frequency receiver. As used herein, "terminal" or "terminal device" 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 manner at any other location on Earth and / or in space. "Terminal" or "terminal device" as used herein may also refer to a communication terminal, an Internet access terminal, or a music / video playback terminal, such as a PDA, a mobile internet device (MID), and / or a mobile phone with music / video playback capabilities, as well as a smart television, set-top box, and other devices.

[0022] In existing 5G technologies, if the system selects the uplink of the 5G system based on RSRP, or uses a supplementary uplink to send a random access preamble sequence, subsequent random access retries will also be performed on the selected uplink. Since the failure of random access is likely to be caused by poor quality of the uplink channel used, restricting subsequent random access retries to be performed on the same uplink as the initial random access process may cause subsequent random access processes to continue to fail due to uplink channel quality issues, thereby affecting system performance and the terminal's access experience.

[0023] Moreover, in the existing 5G system, if there are multiple uplinks in the system that can be used for the random access process, and the terminal selects one of the uplinks for the random access process based on RSRP, then subsequent random access attempts will be performed on this uplink. It is unavoidable that the random access process cannot be completed due to the poor quality of the selected uplink channel caused by measurement errors.

[0024] Based on the technical problems existing in the existing 5G system described above, an embodiment of the present invention provides a random access method, such as Figure 1 As shown, it includes: step 110, when random access is performed based on the determined uplink and the random access fails, if the uplink switching condition is met, switching the uplink; step 120, random access is performed based on the switched uplink.

[0025] An embodiment of the present invention provides a random access method. When random access is performed based on a determined uplink and the random access fails, if the uplink switching condition is met, the link is switched. Therefore, when the random access process fails, it is timely judged whether the uplink switching condition is met to determine whether it is possible to switch to an uplink with better channel conditions for random access. Moreover, when the uplink switching condition is met, the link is switched, which provides a prerequisite for subsequent random access based on the switched link. Random access is performed based on the switched uplink, so that when the random access attempt fails, the terminal can promptly select an uplink with better channel quality to retry the random access process, and perform random access based on the switched uplink, thereby reducing the delay of random access and improving the overall performance of the system.

[0026] In addition, the random access method provided according to the embodiment of the present invention can switch between multiple uplinks during the random access process. That is, when the random access process attempt fails, it can promptly determine whether to switch to an uplink with better channel conditions, so as to obtain additional performance gains by switching between multiple uplinks. Moreover, by adopting the method provided by the embodiment of the present invention, when the initial random access attempt fails due to poor channel quality of the initially selected uplink caused by an initial measurement error, the terminal can promptly select an uplink with better channel quality to retry the random access process, thereby reducing the random access delay and improving the overall performance of the system.

[0027] The random access method provided by the above embodiment of the present invention is described in detail below: Preferably, when the random access performed based on the determined uplink is an initial random access, before performing random access based on the determined uplink, the method further includes: Obtaining a currently measured reference signal received power RSRP and at least one configured or preconfigured link selection threshold; An uplink for initial random access is determined based on a comparison result of the RSRP and at least one link selection threshold.

[0028] Preferably, when the total number of random accesses is not greater than a total random access threshold configured or preconfigured by the base station, whether the uplink switching condition is met is determined according to at least one of the following: The comparison result between the currently measured RSRP and at least one configured or pre-configured link selection threshold is used for determination; Judging based on a comparison result between RSRP and at least one link switching judgment threshold; The determination is made based on a comparison result between the number of random access attempts on the current uplink and a random access number threshold corresponding to the uplink.

[0029] Preferably, the method for determining at least one link switching judgment threshold includes at least one of the following: Obtaining at least one configured or pre-configured link switching judgment threshold; The method is determined according to a configured first preset relationship and at least one preconfigured link selection threshold, where the first preset relationship is a preset relationship between the link selection threshold and the link switching determination threshold.

[0030] Preferably, the method for determining the random access number threshold corresponding to the uplink includes at least one of the following: Obtaining a configured or pre-configured random access threshold corresponding to an uplink; The relationship is determined according to a configured second preset relationship and a preconfigured total random access number threshold, where the second preset relationship is a preset relationship between the total random access number threshold and the random access number threshold.

[0031] Preferably, the random access configuration information includes at least one of random access channel configuration information and random access preamble sequence configuration information; The random access based on the random access configuration information includes at least one of the following situations: Determine, according to the configured random access channel configuration information, the random access channel time-frequency resources in the uplink after the switch, and perform random access based on the random access channel time-frequency resources and the pre-configured corresponding random access preamble sequence; Determine, according to the configured random access preamble sequence configuration information, a preamble sequence for random access in the uplink after the handover, and perform random access based on the preamble sequence and the preconfigured corresponding random access channel time-frequency resources; According to the configured random access channel configuration information, determine the random access channel time-frequency resources in the uplink after the switch, and according to the configured random access preamble sequence configuration information, determine the preamble sequence for random access in the uplink after the switch, and perform random access based on the random access channel time-frequency resources and the preamble sequence.

[0032] Preferably, before performing random access based on the random access configuration information, the method further includes: At least one of the number of random access attempts, the number of power ramps, and the power control parameter corresponding to the uplink after the handover is adjusted.

[0033] Meanwhile, another embodiment of the present invention provides a method for configuring random access information, such as Figure 2 As shown, it includes: step 210, determining relevant configuration information for performing random access in at least two uplinks respectively, the relevant configuration information including information for switching between at least two uplinks; step 220 sending the relevant configuration information.

[0034] The above-mentioned embodiment of the present invention provides a random access method, which determines relevant configuration information for performing random access in at least two uplinks, respectively, and the relevant configuration information includes information for switching between at least two uplinks, providing a prerequisite guarantee for a terminal to perform random access on multiple uplinks and switch among multiple uplinks; sending the relevant configuration information so that the terminal can perform corresponding random access on multiple uplinks according to the relevant configuration information when performing random access.

[0035] The random access method provided by the present invention is described in detail below: Preferably, the information for switching between at least two uplinks includes at least one of the following: at least one link selection threshold; At least one link switching determination threshold; a first preset relationship between the link selection threshold and the link switching determination threshold; Random access number thresholds corresponding to at least two uplinks respectively; a second preset relationship between the total random access number threshold and each random access number threshold; The relevant configuration information also includes at least one of the following: Random access configuration information for performing random access in at least two uplinks respectively; Total random access threshold.

[0036] Preferably, the random access configuration information includes at least one of random access channel configuration information and random access preamble sequence configuration information; Determining random access configuration information for performing random access in at least two uplinks, including any of the following methods: Configuring the same random access channel configuration information and the same random access preamble sequence configuration information for at least two uplinks; configuring different random access channel configuration information and different random access preamble sequence configuration information for at least two uplink configurations respectively; configuring different random access channel configuration information and the same random access preamble sequence configuration information for at least two uplink configurations respectively; The same random access channel configuration information and different random access preamble sequence configuration information are respectively configured for at least two uplink configurations.

[0037] Specifically, in response to the technical problem that the existing 5G technology cannot switch random access channels among multiple available uplinks, the random access method provided by the embodiment of the present invention can switch between random access channels of multiple uplinks. The basic working principle of the random access method provided by the embodiment of the present invention is as follows: When a random access attempt fails, the terminal determines whether the uplink switching conditions are met. If the uplink switching conditions are met, the uplink is switched, and subsequent random access retries are performed on the new uplink after the switch. If the uplink switching conditions are not met, subsequent random access retries continue on the current uplink. If the terminal switches the uplink, the terminal adjusts the configuration and parameters of the random access process based on the corresponding configuration information of the new uplink after the switch. The terminal then selects a random access channel and preamble sequence on the new uplink after the switch based on the new configuration and parameters. Finally, the terminal initiates a random access retry on the new uplink after the switch, and sends a preamble sequence on the random access channel on the selected uplink.

[0038] The above embodiments of the present invention are fully and comprehensively described below through the following preferred implementations: Example 1: In this embodiment, a random access channel switching method in a multi-uplink system is described in conjunction with a specific system. Assuming that there are multiple uplinks in the system, when a terminal performs an initial random access process, it can select one of the multiple uplinks for random access based on RSRP.

[0039] The terminal reads the system information transmitted in the MIB or RMSI to determine the random access configuration information, including the random access channel configuration information and the random access preamble sequence configuration information. The system information also includes threshold information for determining the uplink. This threshold information can be a single threshold or a set of multiple thresholds, used to determine the uplink for random access.

[0040] Specifically, for a system with two available uplinks, Uplink 1 and Uplink 2, the base station-configured or pre-configured threshold 1 for determining the uplink is transmitted in system information. The terminal compares the RSRP with the threshold 1. If the RSRP is less than the threshold 1, Uplink 1 is selected for random access; otherwise, Uplink 2 is selected for random access.

[0041] For uplinks 1, ..., uplink K of K (K>2) For a system with available uplinks, the base station configures or preconfigured threshold sets {η1,…,η (K-1)}, the terminal compares RSRP with the threshold value in the threshold set, if η (k-1) ≤RSRP<η k , then select uplink k ,in 1≤k≤K-1 If RSRP>η (K-1) , then select uplink K .

[0042] Assume that the terminal selects the uplink according to RSRP k During the random access process, the terminal determines the random access channel time and frequency resources based on the random access configuration information in the system information and the synchronization signal block selected according to RSRP, and randomly selects a preamble sequence with equal probability from the available preamble sequences based on the random access preamble sequence configuration information.

[0043] The terminal sends the selected preamble sequence on the selected uplink random access channel time-frequency resource to complete the sending of the preamble sequence.

[0044] Due to measurement problems or channel quality issues, select uplink kThe random access process performed by the terminal may fail, for example, because the random access response cannot be detected; or a random access response is detected, but the preamble sequence identifier contained therein does not match the sent preamble sequence; or a random access response is successfully detected, and the preamble sequence identifier contained therein matches the sent preamble sequence, but the sending of Message 3 times out; or the terminal identifier in the conflict resolution response received after sending Message 3 does not match. After the random access process fails, the terminal will perform a power ramp and retry the random access attempt at the new power level.

[0045] To address the issue of continuous failure of random access attempts by terminals due to poor channel quality, uplink switching can be introduced. Specifically, if the previous random access attempt fails, the uplink used for subsequent random access attempts can be switched. The brief process is as follows: The terminal's previous random access failed; The terminal determines the link switching condition; If the link switching condition is met, the system switches to a new uplink and re-attempts random access; otherwise, the system re-attempts random access on the existing link.

[0046] The above process can be used Figure 3 The flow chart shown is briefly described.

[0047] It should be noted that the implementation premise of the above-mentioned uplink switching process is that the total number of random access attempts made by the terminal does not exceed the maximum number of random access attempts configured or pre-configured by the base station (that is, the total number of random access attempts threshold configured or pre-configured by the base station, such as N max ).

[0048] The switching conditions for the uplink may be as follows: 1. The terminal uses RSRP as the uplink switching condition.

[0049] Specifically, one possible approach is for the terminal to periodically perform uplink measurements and compare the measurement results (i.e., RSRP) with the previously configured or preconfigured threshold or threshold set. If the most recently measured RSRP no longer meets the conditions for selecting the current link, the terminal considers that the link switching conditions are met, selects a new uplink, and attempts a new random access procedure. Otherwise, the terminal considers that the link switching conditions are not met, and continues to attempt the random access procedure on the current uplink. If the random access attempt fails, the terminal selects a new uplink based on the most recently measured RSRP and the previously configured or preconfigured threshold or threshold set, and reattempts the random access procedure on the new uplink.

[0050] A simple example is as follows: In the initial random access process attempt, the terminal selects the uplink according to the above uplink selection criteria k When the random access process of the uplink fails (including multiple failures), the terminal performs uplink measurement and finds that the measurement result (RSRP) no longer meets the uplink k If the selection condition is not met, it is considered that the uplink switching is triggered. The terminal selects a new uplink based on RSRP and the aforementioned configured or pre-configured threshold set. For example, the terminal obtains the following based on the comparison of RSRP and the threshold set: , then select uplink q Make subsequent random access attempts.

[0051] It should be noted that the aforementioned measurement result is a measurement of the downlink, and the corresponding uplink is selected according to the RSRP obtained from the downlink measurement.

[0052] Another possible approach is for the base station to configure or preconfigure another threshold or set of thresholds for determining uplink switching. Specifically, if there are two uplinks, threshold 2 is configured or preconfigured. If the previously selected uplink was less than threshold 1, the link switching condition is that the most recent measurement result (RSRP) is not less than threshold 2. If the previously selected uplink was not less than threshold 1, the link switching condition is that the most recent measurement result is greater than threshold 2.

[0053] If exists K uplinks, configure or preconfigure the threshold set , used for uplink switching judgment, that is, to define the link switching judgment threshold set Specifically, if the uplink was selected last time k ( k < K ), the switching judgment condition is that the RSRP measured most recently does not meet If the condition is not met, then the uplink is switched, otherwise the subsequent random access process is attempted on the current link; if the uplink is selected previously K , then the switch judgment condition is not satisfied If the condition is not met, the uplink is switched, otherwise the subsequent random access process is attempted on the current link. In the above method, when reselecting the uplink, the threshold set configured or pre-configured by the base station can be used. , at this time will is defined as the link selection threshold set, and Defined as a link switching judgment threshold set, reselecting the uplink can also be based on the new threshold set (i.e., the link switching judgment threshold set).

[0054] In this method, the threshold or threshold set used to determine uplink switching can be configured and notified separately in the RMSI, or it can have a fixed relationship with the initially defined threshold or threshold set. For example, the parameters are configured or preconfigured in the MIB or RMSI. , used to describe the relationship between the threshold or threshold set for determining uplink switching (i.e., link switching determination threshold) and the initially defined threshold or threshold set (i.e., link selection threshold). For example, for a system consisting of two uplinks, the relationship between threshold 1 and threshold 2 is: Threshold 2 = Threshold 1 +

[0055] For K Uplink system, threshold set With threshold set The relationship between them is:

[0056] in, .

[0057] In this method, the parameters The threshold or threshold set can be configured together with the above threshold or threshold set through MIB or RMSI, or the terminal can be notified in a predefined or preconfigured manner. The terminal can be notified according to the preconfigured or configured threshold or threshold set and the preconfigured or configured parameters. , determining a threshold or a set of thresholds for uplink switching according to the aforementioned method.

[0058] In another possible approach, when the random access process fails, the downlink is measured to determine whether an uplink handover is required. The handover criteria may use the handover criteria in the above two approaches.

[0059] 2. The terminal uses the number of random access attempts on the selected uplink as the switching condition.

[0060] Specifically, the base station configures or preconfigures the maximum number of random access procedures to be performed on the selected uplink. (i.e., the random access number threshold corresponding to the uplink). If the number of random access attempts on the uplink reaches the configured or predefined maximum number (i.e., the random access number threshold), it is considered that the link switching condition is met and the uplink switching will be performed.

[0061] Furthermore, one possible approach is to count the random access attempts made on the selected uplink, and if the count reaches , then the link is switched. Among them, counting the random access attempts made on the selected uplink includes the following methods: (1) A separate counter can be established for each uplink. When the random access is initialized, each counter is initialized to 1. For the uplink selected for the random access process, the counter corresponding to the uplink is used to count the number of random access attempts on the link. If the counter reaches After the uplink switching is performed, the counter used by the original uplink is cleared or remains unchanged.

[0062] (2) Establish a counter for uplink counting. The counter is initialized to 1 when random access is initialized. When an uplink is selected for random access attempt, the counter records the random access attempts made on the uplink. If the counter reaches , then a link switch is performed. After the link switch is performed, the counter is reset to 1 and records the number of random access attempts on the new uplink.

[0063] For uplink reselection, rules can be predefined: if the system includes two uplinks, then when reselecting an uplink, select another uplink other than the current uplink for random access retry; if the system includes multiple uplinks, select the adjacent uplink for random access retry. For example, if the uplink is selected k , when reselecting the uplink, the uplink will be selected k -1 or uplink k +1.

[0064] (3) If there are two available uplinks, it is possible not to define a separate counter for uplink random access, but to use the transmission count counter used in the random access process to determine the uplink switching. A simple method is that the terminal completes the random access process initialization and selects uplink 1 for random access attempt based on the measurement results. The terminal sends a preamble sequence on uplink 1 and starts counting the transmission count counter. When the transmission count counter reaches Previously, random access retry attempts due to random access failures were all performed on uplink 1. If the transmission count counter reaches , then perform uplink switching, switch to uplink 2, select random access channel time-frequency resources and preamble sequence according to random access configuration information, and perform subsequent random access retry on uplink 2.

[0065] For the case where there are only two uplinks in the system, a random access attempt counter can be used instead of the counter for recording the number of random access attempts on the selected uplink. In this case, the additional criterion for determining whether to perform uplink switching is that if the value N of the random access attempt counter satisfies:

[0066] If yes, uplink switching is performed; otherwise, the random access process is continued to be retried on the currently selected uplink.

[0067] The aforementioned parameter for the number of attempts to perform the random access procedure on the selected uplink is , can be configured and notified in MIB or RMSI, or can be configured in a predefined way. In other configuration methods, parameters can be defined (i.e., the random access threshold corresponding to the uplink) and the maximum total number of random access attempts configured or pre-configured by the base station (i.e., the total number of random access thresholds), for example, a simple way is to configure or pre-configure parameters of the base station. and The relationship between them is:

[0068] in, K is an integer, the sign For rounding operations, you can replace it with round down or round up. K It can be configured through base station configuration or predefined methods, or configured and notified in MIB or RMSI.

[0069] 3. A combination of the above two methods.

[0070] The random access process is attempted in the selected uplink. If the number of attempts reaches the configured or pre-configured number of the base station, (ie, the random access number threshold corresponding to the uplink), and then determine whether uplink switching is required based on the most recent measurement result.

[0071] For counting the number of random access attempts on the selected uplink, the method described in the aforementioned method 2 can be used, that is, setting a counter for each uplink to count, or setting an uplink counter that is reset to zero when an uplink switch is performed; for a system with only two uplinks, the random access process counter can be used instead of the uplink counter. The settings can be notified by base station configuration or pre-configuration, or base station configuration or pre-configuration Maximum total number of random access attempts The relationship between them is configured and notified indirectly.

[0072] If the number of random access attempts on the selected uplink reaches , the most recent measurement result (e.g., RSRP) is compared with a threshold or threshold set configured or preconfigured by the base station to determine whether an uplink handover is required. The configuration and notification of the threshold or threshold set configured or preconfigured by the base station can be performed using the method described in Method 1 above.

[0073] If the number of attempts reaches , and the most recent measurement result meets the uplink switching condition, the criterion in the above method 1 can be used to select a new uplink for switching. However, if the most recent measurement result does not meet the uplink switching condition, no uplink switching is performed, and the counter used to count the number of random access attempts on the selected uplink can be reset to 1 or no additional processing is performed on the counter.

[0074] For the case where there are only two uplinks in the system, a random access attempt counter can be used instead of the counter for recording the number of random access attempts on the selected uplink. In this case, the additional criterion for determining whether to perform uplink switching is that if the value N of the random access attempt counter satisfies:

[0075] The most recent measurement result is used to determine whether an uplink switch is required. N Count.

[0076] Example 2: In this second embodiment, a method for uplink switching during a random access process will be described in conjunction with a specific system. Embodiment 1 is a general example. This embodiment will illustrate the method for uplink switching in conjunction with the situation where a public uplink and a supplementary uplink coexist in a 5G system.

[0077] In this second embodiment, it is assumed that the system has two uplinks, one of which is a common uplink used for normal uplink data transmission in the system; the other is a supplementary uplink used to provide uplink channels for terminals with poor channel quality to facilitate access and data transmission for these terminals. The base station configures random access channel configuration information, random access preamble sequence configuration information, and threshold configuration information for determining whether to perform a random access attempt on the supplementary uplink in the MIB or RMSI.

[0078] After receiving the aforementioned configuration information, the terminal compares the RSRP measured in the downlink with the threshold. If the RSRP is less than the threshold, the terminal selects to perform a random access attempt on the supplementary uplink; if the RSRP is not less than the threshold, the terminal selects to perform a random access attempt on the public uplink. For random access attempts performed on the supplementary uplink, subsequent random access retries due to random access failures will also be performed on the supplementary uplink. For random access attempts performed on the public uplink, if the random access attempt fails, uplink switching can be triggered, and subsequent random access retries can be switched to the supplementary uplink.

[0079] The following content mainly discusses the process of selecting the common uplink for the initial random access process and switching to the supplementary uplink during the subsequent random access retry process.

[0080] During a random access process on the public uplink, if a random access attempt fails and the number of random access attempts does not exceed the maximum number of random access attempts configured by the system, a determination is made as to whether the uplink switching conditions are met. If the uplink switching conditions are met, the process switches to the supplementary uplink, and all subsequent random access attempts are performed on the supplementary uplink. If the uplink switching conditions are not met, random access attempts continue on the public uplink.

[0081] Similar to the first embodiment, the uplink switching condition may take the following forms: 1. The terminal periodically measures the downlink, for example, by measuring the downlink synchronization signal block to obtain the corresponding RSRP.

[0082] If a random access attempt fails, the terminal compares the most recent RSRP with the link selection threshold configured or pre-configured by the base station for selecting the uplink. Compared. If RSRP< , the current public uplink is no longer suitable for the random access attempt of this terminal, and the next random access retry will be performed on the supplementary uplink; if RSRP , the next random access retry is still performed on the public uplink.

[0083] In another embodiment, the base station configures or pre-configures a link switching judgment threshold for determining whether to switch the uplink. , when the random access attempt on the public uplink fails and the number of random access attempts does not exceed the maximum number configured or pre-configured by the base station, the most recently measured RSRP is compared with the link switching judgment threshold for judging uplink switching. In comparison, if RSRP< , the next random access attempt will be switched to the supplementary uplink; if RSRP , the next random access retry will be performed on the common uplink.

[0084] It should be noted that the newly defined link switching judgment threshold for determining whether to switch the uplink is , which can be configured and notified by the base station in the MIB or RMSI, or by configuring or pre-configuring the link switching judgment threshold Link selection threshold for initial uplink selection Specifically, you can pre-configure or configure and notify parameters , the link switching judgment threshold for judging whether to switch the uplink is obtained according to the following relationship :

[0085] In another method, if the random access attempt of the terminal on the public uplink fails, the downlink is measured and the RSRP obtained from the measurement is compared with a threshold configured or pre-configured by the base station to determine whether uplink switching is required.

[0086] 2. Determine whether an uplink handover is required based on the number of random access attempts made on the common uplink.

[0087] Specifically, a counter is used to count the number of random access attempts and pre-configure the parameters (i.e., the random access number threshold corresponding to the uplink), if the random access attempt fails and the counter for counting the number of random access attempts reaches , then the next random access attempt will be made to the supplementary uplink.

[0088] 3. A combination of the first two methods. That is, when the number of random access attempts on the common uplink reaches a preconfigured or configured number, the most recent downlink measurement result (RSRP) is compared with a preconfigured threshold. If the link switching conditions are met, subsequent random access is performed on the supplementary uplink; otherwise, the next random access process is retried on the common uplink.

[0089] Specifically, the base station can configure or preconfigure parameters M , random access procedure on the public uplink, each attempt M times, and determines whether to perform uplink switching.

[0090] One implementation is to configure or preconfigure a test interval counter, which is initialized to 1 when the random access process is initialized, and increment the counter by 1 each time a random access attempt fails, and determine whether the counter reaches M If you do not arrive M , the next random access retry is still performed on the public uplink; if it reaches M , then determine whether to perform link switching based on the RSRP obtained in the most recent measurement and the threshold configured or pre-configured by the base station.

[0091] Another implementation is to directly use the counter value N used to record the number of random access attempts. If the random access procedure performed on the public uplink fails and the random access attempt counter has not reached the maximum number of attempts configured or pre-configured by the base station, then: like , its next random access retry continues on the common uplink; like , it is determined whether link switching is required based on the most recently measured RSRP and the pre-configured or configured threshold.

[0092] Among them, the parameters M The maximum total number of random access attempts that can be configured or pre-configured by the base station or configured or pre-configured with the base station There is a fixed relationship between .in K is an integer, the rounding operation in the above formula can be replaced by rounding down or rounding up. K The base station may configure and notify the MIB or RMSI, or may set the MIB in a predetermined manner.

[0093] In the above method, the method of determining whether to switch the uplink by using RSRP and a preconfigured or configured threshold value may adopt the method described in method 1 of this embodiment.

[0094] Example 3: In this embodiment 3, a method for uplink switching during random access will be introduced in conjunction with a specific system. Embodiments 1 and 2 introduce the criteria for uplink switching of a terminal among multiple uplinks. This embodiment will introduce the corresponding random access method after uplink switching.

[0095] When a terminal performs a random access process on a system that supports multiple uplinks, it first selects an appropriate synchronization signal block based on the measurement result (RSRP) and reads the random access configuration information in the MIB or RMSI, including random access channel configuration information, random access preamble sequence configuration information, and threshold information for selecting the uplink.

[0096] The terminal selects an uplink for random access based on RSRP and threshold information, obtains the time-frequency resources of the random access channel in the uplink from the random access configuration information, and selects a random access preamble sequence. The terminal sends the preamble sequence on the random access channel on the selected uplink.

[0097] The terminal performs a random access attempt on the selected uplink. If the random access attempt fails and the number of random access attempts has not reached the maximum number of random access attempts configured or preconfigured by the base station, it determines whether an uplink handover is required. The determination of whether an uplink handover is required can be made in the manner described in Embodiments 1 and 2. If an uplink handover is not required, random access attempts continue on the current uplink.

[0098] If an uplink handover is required, the system switches to the new uplink and continues the random access attempt. If an uplink handover is required, some parameters and configurations of the random access process need to be adjusted. These parameters and configurations include the preamble transmission count counter, power ramp counter, random access channel configuration, and preamble configuration.

[0099] 1. Preamble transmission count counter This counter is used to count the number of random access attempts made by the terminal. When an uplink handover occurs, the possible behaviors of the preamble transmission count counter include: 1a. Remain unchanged, that is, uplink switching does not affect the counting of preamble transmission times, which is still counted according to the normal random access process.

[0100] 1b. Reset: After the uplink handover, the number of preamble transmissions is reinitialized to 1. In this processing mode, one possible subsequent process is to reset only the number of preamble transmissions to 1, without affecting the selection and processing of other parameters and configurations. Another possible subsequent process is to reinitialize the entire random access process, reset the power ramp counter to 1, and reselect the random access channel time-frequency resources and random access preamble sequence based on the random access configuration information.

[0101] 2. Power ramp counter This counter is used for power ramp calculation during random access retry. When uplink handover occurs, the possible behaviors of the power ramp counter include: 2a. Remain unchanged, that is, uplink switching does not affect the counting of the power ramp counter, and the counting is still carried out according to the normal random access process.

[0102] 2b. Reset, that is, after the uplink is switched, reset the power ramp counter to 1.

[0103] 3. Random access configuration information If different uplinks use unified random access configuration information, the terminal does not need to adjust the random access configuration information when switching the uplink. It only needs to select the random access channel time-frequency resources on the uplink after switching according to the random access channel configuration information included in the random access configuration information.

[0104] If different uplinks use different random access configuration information, that is, the random access configuration information is configured separately for each uplink in the RMSI or MIB, including the random access channel configuration information and random access preamble sequence configuration information for each link. After switching to a new uplink, the corresponding random access configuration information is selected on the selected uplink based on the random access configuration information corresponding to the selected uplink, the random access channel time-frequency resources are determined, and a preamble sequence is selected from the random access preamble sequence resource pool with equal probability based on the random access preamble sequence information. The selected preamble sequence is then sent on the random access channel time-frequency resources on the selected uplink.

[0105] In the case where the random access configuration information used by different uplinks is different, some configuration information is configured uniformly, and some configuration information is configured separately for different uplinks. For example, one possible approach is: different uplinks use unified random access channel configuration information and different random access preamble sequence configuration information. In this case, the terminal selects the random access channel time-frequency resources on the newly selected uplink after the handover based on the unified random access channel configuration information, and randomly selects a preamble sequence with equal probability from the corresponding preamble sequence resource pool based on the selected uplink and the preamble sequence configuration information corresponding to the uplink. The terminal then sends the preamble sequence on the random access channel on the selected uplink.

[0106] Another possible approach is to use unified preamble configuration information for different uplinks but different random access channel configuration information. In this case, the terminal randomly selects a preamble sequence from the corresponding preamble sequence resource pool with equal probability based on the unified preamble configuration information. The terminal determines the random access channel time-frequency resources for the selected uplink based on the selected uplink and the random access channel configuration information corresponding to the uplink. The terminal then transmits the preamble sequence on the random access channel of the selected uplink.

[0107] It should be noted that the random access channel configuration information in the above description includes information on random access channel time-frequency resources, subcarrier spacing, preamble sequence format information, etc.; and the preamble sequence configuration information includes sequence generation information, such as root sequence configuration information, cyclic shift configuration information, etc.

[0108] 4. Power Configuration The random access procedures for different uplinks may use different power control parameters. For example, different uplinks may use different target receive power and power ramp parameters. The power control parameters for different uplinks can be configured and notified in the MIB or RMSI. When the terminal switches to a new uplink and prepares to send a preamble sequence, it calculates the preamble sequence transmit power based on the power control configuration parameters corresponding to the selected uplink (such as the target receive power and power ramp parameters) and the value of the power ramp counter, and adjusts the preamble sequence transmit power based on these parameters.

[0109] It should be noted that the aforementioned four configuration parameters that may be adjusted during uplink switching may be used in combination.

[0110] A special case of this embodiment is a system that includes both a public uplink and a supplementary uplink in a 5G system. The public uplink is used for normal uplink data transmission of the system, while the supplementary uplink is used to provide an uplink channel for terminals with poor channel quality to facilitate access, data transmission, etc. of these terminals. When configuring and notifying the random access configuration information, the base station may only configure or pre-configure one piece of random access configuration information, including random access channel configuration information, random access preamble sequence configuration information, and threshold information for selecting an uplink. That is, when configuring and notifying the random access configuration information, the base station may only configure the random access channel configuration information and pre-configure the random access preamble sequence configuration information, or only configure the random access preamble sequence configuration information and pre-configure the random access channel configuration information, or may configure the random access channel configuration information and the random access preamble sequence configuration information at the same time.

[0111] When sending configuration information, the base station may configure or preconfigure only one set of random access configuration information. In this case, the common uplink and the supplementary uplink use the same random access configuration information configured or preconfigured by the base station; the base station may configure or preconfigure two sets of random access configuration information, one for the random access procedure on the common uplink and one for the random access procedure on the supplementary uplink. The terminal selects the uplink on which to initiate the random access procedure by measuring the downlink and using the threshold information configured or preconfigured by the base station, and selects the random access channel and random access preamble sequence based on the random access configuration information of the corresponding link.

[0112] If the terminal selects the common uplink for random access during initialization, but an uplink handover condition is triggered during the random access process, the terminal will switch to the supplementary uplink for subsequent random access attempts. During the handover, the parameters and configuration information of the random access process will be adjusted, including the preamble sequence transmission count counter, power ramp counter, random access channel configuration, and preamble sequence configuration. These parameters and configuration information can be adjusted using the aforementioned method in this embodiment.

[0113] It should be noted that the random access procedure in the embodiments of the present invention can be either a contention-based random access procedure or a contention-free random access procedure. For a contention-free random access procedure, both the random access channel and the random access preamble sequence can be directly configured by the base station. The random access channels and preamble sequences on the two uplinks can be configured to be the same or different.

[0114] The downlink measurement information described in the present invention can be obtained by measuring synchronization signal blocks. Specifically, the corresponding RSRP is measured for synchronization signal blocks within the synchronization signal block period in the cell, and the average is taken as the RSRP of the measurement result. In this case, the measurement result is the average RSRP. In another approach, the synchronization signal block selected by the terminal can be measured, and the RSRP measured for this synchronization signal block is used as the RSRP for determining whether to switch the uplink.

[0115] For terminals in a synchronized state, the Channel State Information Reference Signal (CSI-RS) can be measured, and the RSRP obtained can be used as the basis for determining whether to switch the uplink. Specifically, the CSI-RS corresponding to all downlink beams can be measured, the obtained RSRP averaged, and the average RSRP used as the basis for determining whether to switch the uplink. Alternatively, the CSI-RS selected by the terminal / configured by the base station can be measured and the measured RSRP directly used.

[0116] Based on the above description, it can be seen that the random access method provided by the embodiment of the present invention can switch the uplink during the random access process, wherein, by measuring the downlink, when the random access process fails and a new uplink is selected when a random access retry is about to be initiated. Moreover, the method provided by the embodiment of the present invention is applicable to the situation where there are multiple uplinks in the system, and can effectively avoid the problem of continuous failure of the random access process due to poor quality of the selected uplink channel when there are multiple uplinks in the system. At the same time, it also avoids the problem of multiple attempts on the same uplink, resulting in high power ramp-up and significant interference to other terminals that need to access.

[0117] Another embodiment of the present invention provides a terminal device, such as Figure 4 As shown, it includes: a switching module 41 and an access module 42, wherein the switching module 41 is used to switch the uplink when random access is performed based on the determined uplink and the random access fails, if the uplink switching condition is met; the access module 42 is used to perform random access based on the switched uplink.

[0118] Specifically, when the total number of random accesses is not greater than the configured or pre-configured total random access threshold, the switching module 41 is specifically used to determine whether the uplink switching condition is met based on at least one of the following: judging based on the comparison result of the RSRP obtained by the current measurement and at least one configured or pre-configured link selection threshold; judging based on the comparison result of the RSRP and at least one link switching judgment threshold; judging based on the comparison result of the number of random access attempts on the current uplink and the random access number threshold corresponding to the uplink.

[0119] Furthermore, the switching module 41 determines at least one link switching judgment threshold in a manner including at least one of the following: obtaining at least one configured or pre-configured link switching judgment threshold; determining based on a configured first preset relationship and at least one pre-configured link selection threshold, where the first preset relationship is a preset relationship between the link selection threshold and the link switching judgment threshold.

[0120] Furthermore, the switching module 41 determines the random access number threshold corresponding to the uplink, including at least one of the following: obtaining a configured or pre-configured random access number threshold corresponding to the uplink; determining according to a configured second preset relationship and a pre-configured random access total number threshold, where the second preset relationship is a preset relationship between the total random access number threshold and the random access number threshold.

[0121] Furthermore, the access module 42 is specifically configured to obtain random access configuration information corresponding to the uplink after the switch; and perform random access based on the random access configuration information.

[0122] Further, when the random access configuration information includes at least one of random access channel configuration information and random access preamble sequence configuration information, the access module 42 is specifically used for at least one of the following situations: determining the random access channel time-frequency resources in the uplink after switching according to the configured random access channel configuration information, and performing random access based on the random access channel time-frequency resources and the pre-configured corresponding random access preamble sequence; determining the preamble sequence for random access in the uplink after switching according to the configured random access preamble sequence configuration information, and performing random access based on the preamble sequence and the pre-configured corresponding random access channel time-frequency resources; determining the random access channel time-frequency resources in the uplink after switching according to the configured random access channel configuration information, and determining the preamble sequence for random access in the uplink after switching according to the configured random access preamble sequence configuration information, and performing random access based on the random access channel time-frequency resources and the preamble sequence.

[0123] Furthermore, the access module 42 is further configured to adjust at least one of the number of random access attempts, the number of power ramps, and the power control parameter corresponding to the uplink after the handover before performing random access based on the random access configuration information.

[0124] An embodiment of the present invention provides a random access method. When random access is performed based on a determined uplink and the random access fails, if the uplink switching condition is met, the link is switched. Therefore, when the random access process fails, it is timely judged whether the uplink switching condition is met to determine whether it is possible to switch to an uplink with better channel conditions for random access. Moreover, when the uplink switching condition is met, the link is switched, which provides a prerequisite for subsequent random access based on the switched link. Random access is performed based on the switched uplink, so that when the random access attempt fails, the terminal can promptly select an uplink with better channel quality to retry the random access process, and perform random access based on the switched uplink, thereby reducing the delay of random access and improving the overall performance of the system.

[0125] Another embodiment of the present invention provides a base station, such as Figure 5 As shown, it includes: a determination module 51 and a sending module 52, wherein the determination module 51 is used to determine relevant configuration information for random access in at least two uplinks respectively, and the relevant configuration information includes information for switching between at least two uplinks; the sending module 52 is used to send the relevant configuration information.

[0126] Specifically, the information for switching between at least two uplinks determined by the determination module 51 includes at least one of the following: at least one link selection threshold; at least one link switching judgment threshold; a first preset relationship between the link selection threshold and the link switching judgment threshold; random access number thresholds corresponding to at least two uplinks respectively; a second preset relationship between the total random access number threshold and each random access number threshold; the relevant configuration information also includes at least one of the following: random access configuration information for performing random access in at least two uplinks respectively; and the total random access number threshold.

[0127] Furthermore, the random access configuration information includes at least one of random access channel configuration information and random access preamble sequence configuration information; the determination module 51 determines the random access configuration information for performing random access in at least two uplinks, including any of the following methods: Configuring the same random access channel configuration information and the same random access preamble sequence configuration information for at least two uplinks; configuring different random access channel configuration information and different random access preamble sequence configuration information for at least two uplink configurations respectively; configuring different random access channel configuration information and the same random access preamble sequence configuration information for at least two uplink configurations respectively; The same random access channel configuration information and different random access preamble sequence configuration information are respectively configured for at least two uplink configurations.

[0128] In an embodiment of the present invention, relevant configuration information for performing random access in at least two uplinks is determined, and the relevant configuration information includes information for switching between at least two uplinks, which provides a prerequisite for the terminal to perform random access on multiple uplinks and switch among multiple uplinks; the relevant configuration information is sent so that the terminal can perform corresponding random access on multiple uplinks according to the relevant configuration information when performing random access.

[0129] Yet another embodiment of the present invention provides a terminal device, comprising: a processor; and a memory configured to store machine-readable instructions, which, when executed by the processor, causes the processor to perform the above-mentioned random access method.

[0130] Yet another embodiment of the present invention provides a base station, comprising: a processor; and a memory configured to store machine-readable instructions, which, when executed by the processor, enable the processor to execute the above-described method for configuring random access information.

[0131] Figure 6A block diagram of a computing system that can be used to implement a base station or user equipment according to an embodiment of the present disclosure is schematically shown.

[0132] like Figure 6 As shown, the computing system 600 includes a processor 610, a computer readable storage medium 620, an output interface 630, and an input interface 640. The computing system 600 can execute the above reference Figure 1 or Figure 2 The method described is to configure a reference signal and perform data transmission based on the reference signal.

[0133] Specifically, the processor 610 may include, for example, a general-purpose microprocessor, an instruction set processor and / or a related chipset and / or a dedicated microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 610 may also include an onboard memory for cache purposes. The processor 610 may be a processor for executing reference Figure 1 or Figure 2 The different actions of the described method flow may be performed by a single processing unit or by multiple processing units.

[0134] Computer-readable storage medium 620 can be, for example, any medium capable of containing, storing, conveying, propagating, or transmitting instructions. For example, computer-readable storage media can include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, components, or propagation media. Specific examples of computer-readable storage media include: magnetic storage devices such as magnetic tape or hard disk drives (HDDs); optical storage devices such as compact discs (CD-ROMs); memory such as random access memory (RAM) or flash memory; and / or wired or wireless communication links.

[0135] The computer readable storage medium 620 may include a computer program that may include code / computer executable instructions that, when executed by the processor 610, cause the processor 610 to perform, for example, the above-mentioned combination of Figure 1 or Figure 2 The described method sequence and any variations thereof.

[0136] The computer program may be configured to have computer program code, for example, including computer program modules. For example, in an exemplary embodiment, the code in the computer program may include one or more program modules, such as module 1, module 2, etc. It should be noted that the division method and number of modules are not fixed, and those skilled in the art may use appropriate program modules or combinations of program modules according to actual circumstances. When these program module combinations are executed by the processor 610, the processor 610 may execute, for example, the above combination. Figure 1 or Figure 2 The described method sequence and any variations thereof.

[0137] According to an embodiment of the present disclosure, the processor 610 may use the output interface 630 and the input interface 640 to perform the above combined Figure 1 or Figure 2 The described method sequence and any variations thereof.

[0138] Those skilled in the art will appreciate that the present invention encompasses devices for performing one or more of the operations described herein. These devices may be specially designed and manufactured for the desired purpose, or they may include known devices found in general-purpose computers. These devices have computer programs stored therein, which are selectively activated or reconfigured. Such computer programs may be stored on a device (e.g., a computer) readable medium or on any type of medium suitable for storing electronic instructions and coupled to a bus. Such computer-readable medium includes, but is not limited to, any type of disk (including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory), RAM (Random Access Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic cards, or optical cards. In other words, a readable medium includes any medium that can store or transmit information in a form that can be read by a device (e.g., a computer).

[0139] Those skilled in the art will appreciate that each block in these structural diagrams and / or block diagrams and / or flow charts, as well as combinations of blocks in these structural 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 specialized computer, or a processor of other programmable data processing methods for implementation, thereby executing the schemes specified in the blocks or multiple blocks in the structural diagrams and / or block diagrams and / or flow charts disclosed in the present invention through the processor of the computer or other programmable data processing method.

[0140] Those skilled in the art will appreciate that the steps, measures, and schemes in the various operations, methods, and processes discussed in the present invention may be interchanged, modified, combined, or deleted. Furthermore, other steps, measures, and schemes in the various operations, methods, and processes discussed in the present invention may also be interchanged, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and schemes in the prior art that are similar to those disclosed in the present invention may also be interchanged, modified, rearranged, decomposed, combined, or deleted.

[0141] The above descriptions are only partial embodiments of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A random access method, characterized in that: include: When random access is performed based on the determined uplink and the random access fails, if the uplink switching condition is met, switching the uplink; Random access is performed based on the uplink after switching.

2. The method according to claim 1, characterized in that When the total number of random accesses is not greater than a threshold for the total number of random accesses configured or pre-configured by the base station, whether the uplink switching condition is met is determined based on at least one of the following: The comparison result between the currently measured RSRP and at least one configured or pre-configured link selection threshold is used for determination; Judging according to a comparison result of the RSRP and at least one link switching judgment threshold; The determination is made based on a comparison result between the number of random access attempts on the current uplink and a random access number threshold corresponding to the uplink.

3. The method according to claim 2, characterized in that The method of determining the at least one link switching judgment threshold includes at least one of the following: Obtaining the at least one link switching judgment threshold that is configured or preconfigured; The method is determined according to a configured first preset relationship and the at least one pre-configured link selection threshold, where the first preset relationship is a preset relationship between the link selection threshold and the link switching judgment threshold.

4. The method according to claim 2, characterized in that The method for determining the random access number threshold corresponding to the uplink includes at least one of the following: Obtaining a configured or pre-configured random access number threshold corresponding to the uplink; The method is determined according to a configured second preset relationship and a preconfigured total random access number threshold, where the second preset relationship is a preset relationship between the total random access number threshold and the random access number threshold.

5. The method according to any one of claims 1 to 4, characterized in that The performing random access based on the uplink after the handover includes: Acquiring random access configuration information corresponding to the switched uplink; Random access is performed based on the random access configuration information.

6. The method according to claim 5, characterized in that The random access configuration information includes at least one of random access channel configuration information and random access preamble sequence configuration information; The performing random access based on the random access configuration information includes at least one of the following situations: Determining, according to the configured random access channel configuration information, a random access channel time-frequency resource in the uplink after the switch, and performing random access based on the random access channel time-frequency resource and a pre-configured corresponding random access preamble sequence; Determining, according to the configured random access preamble sequence configuration information, a preamble sequence for random access in the uplink after the handover, and performing random access based on the preamble sequence and a preconfigured corresponding random access channel time-frequency resource; Determine, according to the configured random access channel configuration information, the random access channel time-frequency resources in the uplink after the switch, and determine, according to the configured random access preamble sequence configuration information, the preamble sequence for random access in the uplink after the switch, and perform random access based on the random access channel time-frequency resources and the preamble sequence.

7. The method according to claim 5 or 6, characterized in that Before performing random access based on the random access configuration information, the method further includes: At least one of the number of random access attempts, the number of power ramps, and the power control parameter corresponding to the uplink after the handover is adjusted.

8. A method for configuring random access information, characterized in that: include: Determining relevant configuration information for performing random access in at least two uplinks respectively, wherein the relevant configuration information includes information for performing switching between the at least two uplinks; Send the relevant configuration information.

9. The method according to claim 8, characterized in that The information for switching between at least two uplinks includes at least one of the following: at least one link selection threshold; At least one link switching determination threshold; a first preset relationship between the link selection threshold and the link switching determination threshold; Random access number thresholds corresponding to at least two uplinks respectively; a second preset relationship between the total random access number threshold and each random access number threshold; The relevant configuration information also includes at least one of the following: Random access configuration information for performing random access in at least two uplinks respectively; Total random access threshold.

10. The method according to claim 9, characterized in that The random access configuration information includes at least one of random access channel configuration information and random access preamble sequence configuration information; Determining random access configuration information for performing random access in at least two uplinks, including any of the following methods: Configuring the same random access channel configuration information and the same random access preamble sequence configuration information for at least two uplinks; configuring different random access channel configuration information and different random access preamble sequence configuration information for at least two uplink configurations respectively; configuring different random access channel configuration information and the same random access preamble sequence configuration information for at least two uplink configurations respectively; The same random access channel configuration information and different random access preamble sequence configuration information are respectively configured for at least two uplink configurations.

11. A terminal device, characterized in that: include: processor; as well as A memory configured to store machine-readable instructions, wherein when the instructions are executed by the processor, the processor performs the random access method according to any one of claims 1 to 7.

12. A base station, characterized in that: include: processor; as well as The memory is configured to store machine-readable instructions, and when the instructions are executed by the processor, the processor causes the processor to perform the method for configuring random access information according to any one of claims 8 to 10.

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