WO2018028210A1 - 无线通信系统中的随机接入方法和装置、用户终端 - Google Patents

无线通信系统中的随机接入方法和装置、用户终端 Download PDF

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Publication number
WO2018028210A1
WO2018028210A1 PCT/CN2017/078184 CN2017078184W WO2018028210A1 WO 2018028210 A1 WO2018028210 A1 WO 2018028210A1 CN 2017078184 W CN2017078184 W CN 2017078184W WO 2018028210 A1 WO2018028210 A1 WO 2018028210A1
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Prior art keywords
carrier
index
target
resource
prach
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PCT/CN2017/078184
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English (en)
French (fr)
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许靖
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to KR1020197007265A priority Critical patent/KR102279616B1/ko
Priority to EP22203619.6A priority patent/EP4161206A1/en
Priority to FIEP17838342.8T priority patent/FI3500040T3/fi
Priority to EP17838342.8A priority patent/EP3500040B1/en
Priority to JP2019507784A priority patent/JP7093768B2/ja
Publication of WO2018028210A1 publication Critical patent/WO2018028210A1/zh
Priority to US16/274,204 priority patent/US10856337B2/en
Priority to US17/103,933 priority patent/US11582811B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H04W74/0883—Non-scheduled access, e.g. ALOHA using a dedicated channel for access for un-synchronized access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure

Definitions

  • the present application relates to the field of communications, and in particular, to a random access method and apparatus, and a user terminal in a wireless communication system.
  • the eNodeB instructs the user equipment UE (User Equipment) to initiate a random access procedure by transmitting a PDCCH order (PDCCH Physical Downlink Control Channel).
  • PDCCH order Physical Downlink Control Channel
  • the eNodeB indicates the PRACH (Physical Random Access Channel) resource information used by the UE (the PRACH information indicated by the PDCCH order is shown in Table 1).
  • the UE sends the PRACH on the resource specified by the eNodeB.
  • the UE sends the PRACH using the Preamble (preamble) codeword specified by the eNodeB.
  • the PRACH resources are configured according to the coverage level.
  • Each coverage level corresponds to a set of PRACH time-frequency resources, PRACH repetition times, and random access times.
  • the eMTC system also configures one for each coverage. Group preamble codewords.
  • the PRACH resource index indicated by the eNodeB or The subcarrier ID or the preamble codeword must be in the PRACH resource group of the initial coverage level to ensure that the UE initiates a random access procedure according to the PRACH resource indicated by the eNodeB on the initial coverage level.
  • the PRACH resource index or the subcarrier ID or the preamble codeword indicated by the eNodeB may not exist in the higher level PRACH resource group.
  • the UE cannot initiate random access, or the PRACH is sent according to the PRACH information indicated in the eNodeB, but the eNodeB does not respond. As a result, the random access fails, and the success rate of the random access initiated by the eNodeB is reduced.
  • the present application provides a random access method and apparatus, and a user terminal in a wireless communication system, to at least solve the technical problem that a random access success rate initiated by a mobile base station in the related art is low.
  • a random access method in a wireless communication system comprising: receiving indication information sent by a mobile base station, where the indication information is used to indicate that the user terminal initiates random access;
  • the resource information carried in the level and the indication information determines the target PRACH resource from the available resources, where the target PRACH resource is used to send the PRACH signal, the PRACH signal is used to initiate the random access, and the current coverage level is the coverage of the current random access to be initiated.
  • the available resource is a resource that is allowed to be used under the current coverage level; when the random access failure is initiated on the target PRACH resource, the target PRACH resource is re-determined from the available resources based on the updated coverage level and resource information, and The PRACH signal is transmitted on the re-determined target PRACH resource.
  • the random access failure initiated on the target PRACH resource is determined by: obtaining the number of failures of initiating the random access; and determining, when the number of failures reaches a preset value, the random connection initiated on the target PRACH resource.
  • the entry fails, where the preset value is the maximum number of times the PRACH signal is allowed to be transmitted under the current coverage level.
  • the method further includes: after obtaining the number of failures of initiating the random access, resending the PRACH signal on the target PRACH resource if the number of failures is less than a preset value.
  • the updated coverage level is one level higher than the pre-update coverage level.
  • the target PRACH resource includes a target time-frequency domain resource, a target codeword, and a target sub-carrier for transmitting the PRACH signal, and determining the target PRACH resource from the available resources based on the current coverage level and the resource information carried in the indication information includes: The target PRACH resource is mapped from the available resources under the current coverage level according to the resource information.
  • mapping the target PRACH resources from the available resources under the current coverage level according to the resource information includes: the quantity and resources of the available time-frequency domain resources according to the current coverage level.
  • the time-frequency resource index in the information determines the target time-frequency domain resource; and/or, the target codeword is determined according to the start codeword, the end codeword, and the preamble index in the resource information of the preamble under the current coverage level.
  • the target codeword includes: an index ID3 according to the start codeword, and an index ID4 of the end codeword.
  • mapping the target PRACH resources from the available resources under the current coverage level according to the resource information includes: according to the number of subcarriers under the current coverage level, the starting subcarriers The subcarrier index or offset in the index and resource information determines the target subcarrier.
  • determining the target subcarrier according to the subcarrier index or the offset in the subcarrier and the resource information in the current coverage level includes: the number of subcarriers Num2 under the current coverage level, the index ID7 of the initial subcarrier, and resource information.
  • the Num3, the start corresponding to the coverage level indicated in the indication information, calculates the third index ID8 ID7+(Num3-ID10) mod(Num2) in the carrier index ID10; the subcarrier corresponding to the ID8 is used as the target subcarrier.
  • the indication information is PDCCH order information.
  • the indication information is handover information.
  • a random access device in a wireless communication system includes: a receiving unit, configured to receive indication information sent by a mobile base station, where the indication information is used to indicate that the user terminal initiates a random And a determining unit, configured to determine, according to the current coverage level and the resource information carried in the indication information, the target PRACH resource, where the target PRACH resource is used to send a PRACH signal, and the PRACH signal is used to initiate a random access, where The coverage level is the coverage level at which the random access is to be initiated; the sending unit is configured to re-determine the target PRACH from the available resources based on the updated coverage level and resource information when the random access failure is initiated on the target PRACH resource. The resource is sent and the PRACH signal is sent on the re-determined target PRACH resource.
  • the sending unit includes: an obtaining module, configured to acquire a number of failures of initiating random access; and a first determining module, configured to determine, when the number of failures reaches a preset value, random connection initiated on the target PRACH resource The entry fails, where the preset value is the maximum number of times the PRACH signal is allowed to be transmitted under the current coverage level.
  • the sending unit further includes: a sending module, configured to: after obtaining the number of failures of initiating the random access, resending the PRACH signal on the target PRACH resource if the number of failures is less than a preset value.
  • a sending module configured to: after obtaining the number of failures of initiating the random access, resending the PRACH signal on the target PRACH resource if the number of failures is less than a preset value.
  • the updated coverage level is one level higher than the pre-update coverage level.
  • the target PRACH resource includes a target time-frequency domain resource, a target codeword, and a target sub-carrier for transmitting the PRACH signal
  • the determining unit is further configured to map the target PRACH resource from the available resources in the current coverage level according to the resource information.
  • the determining unit includes: a second determining module, configured to determine, according to the quantity of resources of the available time-frequency domain resources and the time-frequency resource index in the resource information, in the current coverage level The target time-frequency domain resource; the third determining module is configured to determine the target codeword according to the start codeword, the end codeword, and the preamble index in the resource information of the preamble under the current coverage level.
  • the determining unit includes: a fourth determining module, configured to use, according to the number of subcarriers in the current coverage level, the index of the starting subcarrier, and the sub The carrier index or offset determines the target subcarrier.
  • the third index ID8 ID7+(Num3-ID10) mod(Num2); the subcarrier corresponding to ID8 is used as the target subcarrier.
  • the indication information is PDCCH order information.
  • the indication information is handover information.
  • a user terminal includes: a memory, where the memory stores a code that includes the following steps: receiving indication information sent by the mobile base station, where the indication information is used to indicate that the user terminal initiates a random
  • the target PRACH resource is determined from the available resources based on the current coverage level and the resource information carried in the indication information, where the target PRACH resource is used to send the PRACH signal, the PRACH signal is used to initiate the random access, and when the target PRACH resource is used.
  • the target PRACH resource is re-determined from the available resources based on the updated coverage level and resource information, and the PRACH signal is sent on the re-determined target PRACH resource;
  • the processor is used to execute the memory in the memory.
  • the stored code; the transmitting device is respectively connected to the memory and the processor for transmitting the code in the memory to the processor.
  • a storage medium which may be configured to store program code for performing the following steps: receiving indication information sent by a mobile base station, wherein the indication information is used to indicate that the user terminal initiates Random access; determining a target PRACH resource from available resources based on current coverage level and resource information carried in the indication information, where the target PRACH resource is used to send a PRACH signal, and the PRACH signal is used to initiate random access; when the target PRACH resource is used If the random access failure is initiated, the target PRACH resource is re-determined from the available resources based on the updated coverage level and resource information, and the PRACH signal is sent on the re-determined target PRACH resource.
  • the indication information sent by the mobile base station is received, where the indication information is used to indicate that the user terminal initiates random access; the target PRACH resource is determined from the available resources based on the current coverage level and the resource information carried in the indication information, and the target PRACH resource is used.
  • the PRACH signal is used to initiate the random access; when the random access fails on the target PRACH resource, the target PRACH is re-determined from the available resources based on the updated coverage level and resource information.
  • the resource and the PRACH signal are sent on the re-determined target PRACH resource, thereby solving the technical problem that the random access success rate initiated by the mobile base station in the related art is low, and realizing the technical effect of improving the random access success rate.
  • FIG. 1 is a schematic diagram of an optional user terminal in accordance with the present application.
  • FIG. 3 is a flow diagram of random access in an alternative wireless communication system in accordance with the present application.
  • FIG. 5 is a schematic diagram of a random access device in a wireless communication system in accordance with the present application.
  • the method embodiment provided in Embodiment 1 of the present application can be executed in a user terminal, a computer terminal or the like.
  • the user terminal may include one or more (only one shown) processor 101 (the processor 101 may include, but is not limited to, a microprocessor MCU or programmable A processing device such as a logic device FPGA, a memory 103 for storing data, and a transmission device 105 for communication functions.
  • processor 101 may include, but is not limited to, a microprocessor MCU or programmable A processing device such as a logic device FPGA, a memory 103 for storing data, and a transmission device 105 for communication functions.
  • FIG. 1 is merely illustrative and does not refer to the above electronic device. The structure is limited.
  • the memory 103 can be used to store software programs and modules of application software, such as program instructions/modules corresponding to the control method of the device in the present application, and the processor 101 executes various functions by running software programs and modules stored in the memory 103. Application and data processing, that is, the above method is implemented.
  • the memory can include high speed random access memory and can also include non-volatile memory such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory.
  • the memory can further include memory remotely located relative to the processor, which can be connected to the computer terminal over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • the memory includes a code that includes the following steps: receiving indication information sent by the mobile base station, where the indication information is used to indicate that the user terminal initiates random access; and based on the current coverage level and resource information carried in the indication information, Determining a target PRACH resource, where the target PRACH resource is used to send a PRACH signal, the PRACH signal is used to initiate a random access, and the current coverage level is a coverage level at which a random access is currently to be initiated; when a randomization is initiated on the target PRACH resource If the access fails, the target PRACH resource is re-determined from the available resources based on the updated coverage level and resource information, and the PRACH signal is sent on the re-determined target PRACH resource.
  • the transmission device is for receiving or transmitting data via a network.
  • the above-described network specific examples may include a wireless network provided by a communication provider of a computer terminal.
  • the transmission device includes a Network Interface Controller (NIC) that can be connected to other network devices through the base station to communicate with the Internet.
  • the transmission device can be a Radio Frequency (RF) module for communicating with the Internet wirelessly.
  • NIC Network Interface Controller
  • RF Radio Frequency
  • an embodiment of a method of random access in a wireless communication system is provided, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system such as a set of computer executable instructions And, although the logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than the ones described herein.
  • FIG. 2 is a flow chart of random access in a wireless communication system according to the present application. As shown in FIG. 2, the method includes the following steps:
  • Step S201 Receive indication information sent by the mobile base station, where the indication information is used to indicate that the user terminal initiates random access.
  • Step S202 Determine a target PRACH resource from the available resources based on the current coverage level and resource information carried in the indication information, where the target PRACH resource is used to send a PRACH signal, and the PRACH signal is used to initiate a random access, and the current coverage level is currently to initiate a random access.
  • the coverage level of the access, the available resources are the resources allowed to be used under the current coverage level.
  • Step S203 When a random access failure is initiated on the target PRACH resource, the target PRACH resource is re-determined from the available resources based on the updated coverage level and resource information, and the PRACH signal is sent on the re-determined target PRACH resource.
  • the indication information sent by the mobile base station is received, where the indication information is used to indicate that the user terminal initiates random access; and the target PRACH resource is determined from the available resources based on the resource information carried in the current coverage level and the indication information, and the target PRACH resource is used.
  • the PRACH signal is sent, the PRACH signal is used to initiate random access; when the random access failure is initiated on the target PRACH resource, the target PRACH resource is re-determined from the available resources based on the updated coverage level and resource information, and The PRACH signal is sent on the re-determined target PRACH resource, thereby solving the technical problem that the random access success rate initiated by the mobile base station in the related art is low, and the technical effect of improving the random access success rate is achieved.
  • the execution body of the foregoing steps may be a user terminal or the like, but is not limited thereto.
  • the indication information when receiving the indication information sent by the mobile base station, the indication information includes PDCCH order information, that is, the base station eNodeB may send the indication information by using the PDCCH order, but is not limited thereto, and similar messages may be adopted in other types of base stations. To send.
  • PDCCH order information that is, the base station eNodeB may send the indication information by using the PDCCH order, but is not limited thereto, and similar messages may be adopted in other types of base stations. To send.
  • step S202 when the target PRACH resource is determined from the available resources based on the current coverage level and the resource information carried in the indication information, the target PRACH resource is mapped from the available resources under the current coverage level according to the resource information.
  • the target PRACH resource may be determined according to a manner corresponding to the system type of the mobile base station.
  • the target PRACH resource includes a target time-frequency domain resource and a target codeword for transmitting the PRACH signal, and the target PRACH is determined from the available resources based on the current coverage level and the resource information carried in the indication information.
  • the resource includes: determining a target time-frequency domain resource according to a quantity of resources of an available time-frequency domain resource and a time-frequency resource index in the resource information according to a current coverage level; and/or, according to a starting codeword of a preamble under a current coverage level. The preamble index in the end codeword and resource information determines the target codeword.
  • Determining the target subcarrier according to the start codeword, the end codeword, and the preamble index in the resource information in the current coverage level includes: an index ID3 according to the start codeword, an index ID4 of the end codeword, and a preamble index.
  • the target PRACH resource includes a target subcarrier for transmitting the PRACH signal
  • determining the target PRACH resource from the available resources based on the current coverage level and the resource information carried in the indication information includes: according to the current The number of subcarriers under the coverage level, the index of the starting subcarrier, and the subcarrier index or offset in the resource information determine the target subcarrier.
  • determining the target subcarrier according to the subcarrier index or the offset in the subcarrier and the resource information in the current coverage level includes: the number of subcarriers Num2 under the current coverage level, the index ID7 of the initial subcarrier, and resource information.
  • the subcarrier offset Num3 in the calculation of the third index ID8 ID7+(Num3)mod(Num2), or according to the number of subcarriers Num2 in the current coverage level, the index ID7 of the initial subcarrier, the subcarrier index Num3 in the resource information, and the coverage level indicated in the indication information.
  • the random access failure initiated on the target PRACH resource may be determined by: obtaining the number of failures of initiating the random access; and determining, if the number of failures reaches the preset value, the initiation on the target PRACH resource.
  • the random access fails, where the preset value is the maximum number of times the PRACH signal is allowed to be transmitted under the current coverage level.
  • the PRACH signal may be resent on the target PRACH resource until the number of failures reaches the preset value;
  • the coverage level is one level higher than the coverage level before the update.
  • the eMTC FDD system is configured with four coverage levels, namely CEL0/CEL1/CEL2/CEL2, of which CEL0 has the lowest coverage level.
  • the PRACH resource information of the four coverage levels is shown in Table 2.
  • the PRACH time domain resources (radio frame number and subframe number) corresponding to the foregoing PRACH configuration index are as shown in Table 3.
  • Step S301 In the eMTC system, the eNodeB instructs the UE to initiate random access (transmitting a PDCCH order), and the indicated RPACH resource information includes: an initial coverage level and a Subcarrier indication of NPRACH.
  • the meaning of the indicated PRACH information in the PDCCH order sent by the eNodeB is as shown in Table 4.
  • Step S302 The UE receives the PDCCH order, obtains the initial coverage level information, and obtains the PRACH resource corresponding to the level, including the time domain location, the frequency domain location, and the Preamble codeword.
  • the number of available PRACH time-frequency resources is NPRACH.
  • the UE acquires the time-frequency resource information and the number of repetitions of the PRACH resource group according to the initial coverage level; the UE calculates the PRACH sub-carrier ID used by the UE according to the number of PRACH sub-carriers available for the Subcarrier indication of NPRACH and the initial coverage level.
  • Step S303 the UE sends a PRACH on the determined PRACH resource.
  • the UE determines the UE used by the modulo operation (mod) according to the PRACH Mask Index and the number of PRACH time-frequency resources (NPRACH).
  • Mask Index The target time-frequency domain resource index:
  • UE Mask Index (PRACH Mask Index) mod (NPRACH) +1.
  • the number of PRACH resources is obtained according to the PRACH resource configuration in the 36.211 protocol.
  • the UE calculates the Preamble ID (target subcarrier index) used by the UE according to the Preamble Index and the Preamble codeword number (NPreamble) delivered by the eNodeB:
  • Preamble ID (firstPreamble-r13)+(Preamble Index) mod(NPreamble),
  • NPreamble (lastPreamble-r13)-(firstPreamble-r13)+1
  • FirstPreamble-r13 is the cell in the "36.331” protocol, which is the starting Preamble codeword currently covered; lastPreamble-r13 is the cell in the "36.331” protocol, and the last Preamble codeword used for the current coverage level. .
  • the UE transmits the PRACH according to the PRACH and Preamble codewords determined in the above steps.
  • Step S304 determining whether the random access is successful, if yes, executing step S306, otherwise performing step S305.
  • Step S305 If the initiated random access procedure fails, the PRACH is sent again on the determined PRACH resource, and it is determined whether the number of times the PRACH is sent on the initial coverage level is less than the maximum random access number. If yes, step S307 is performed, otherwise, the process is performed. Step S306.
  • the UE receives the PDCCH order, obtains the initial coverage level as CEL1, and obtains the PRACH resource corresponding to the CEL1, and the PRACH configuration index is 9, that is, the Preamble code is sent on the subframes 1, 4, and 7 of each radio frame.
  • sf is the radio frame number and ns is the slot number.
  • step S306 the random access process ends.
  • Step S307 whether the number of PRACHs sent on the initial coverage level is less than the number of random accesses of the coverage level, if it is determined to perform step S303, otherwise step S308 is performed.
  • the PRACH resources corresponding to the level including the time domain location, the frequency domain location, and the Preamble codeword.
  • the UE obtains the time-frequency resource information and the number of repetitions of the PRACH resource group according to the current coverage level.
  • the UE calculates the PRACH sub-carrier ID used according to the number of PRACH sub-carriers available for the Subcarrier indication of NPRACH and the current coverage level.
  • the UE calculates the PRACH UE Mask Index and the Preamble ID it uses at the new coverage level, and the UE transmits the PRACH on the determined PRACH resource.
  • the UE upgrades the coverage level to the CEL2, and obtains the PRACH resource corresponding to the level: the PRACH configuration index is 6, that is, The Preamble code is transmitted on the subframes 1 and 6 of each radio frame.
  • the PRACH start subframe period is 8 subframes, the UE is satisfied
  • the Preamble code is sent on the subframe.
  • sf is the radio frame number
  • ns is the slot number.
  • the UE calculates the preamble index (ie, Preamble ID) used by the Preamble Index in the PDCCH order to be 24+15 mod 12, that is, 27.
  • the UE receives the PDCCH order, obtains the initial coverage level as CEL1, and obtains the PRACH resource corresponding to the CEL1: the PRACH configuration index is 9, that is, the Preamble code is sent on the subframes 1, 4, and 7 of each radio frame.
  • the Preamble code is transmitted on the subframe 7 of the radio frames. According to the PRACH start subframe period is 4 subframes, the UE is satisfied The Preamble code is sent on the subframe.
  • sf is the radio frame number and ns is the slot number.
  • the UE raises the coverage level to CEL2, and obtains the PRACH resource corresponding to the level: the PRACH configuration index is 6, that is, every The Preamble code is transmitted on the subframes 1 and 6 of the radio frame.
  • the UE is satisfied The Preamble code is sent on the subframe.
  • sf is the radio frame number
  • ns is the slot number.
  • the NB-IoT system is configured with three coverage levels, namely CEL0/CEL1/CEL2, of which CEL0 has the lowest coverage level.
  • the PRACH resource information of the three coverage levels is shown in Table 5.
  • Step 401 In the NB-IoT system, the eNodeB sends a PDCCH order, where the indicated PRACH information is as shown in Table 6, including the fields "Starting number of NPRACH repetitions" and "Subcarrier indication of NPRACH".
  • Step S402 The UE receives the PDCCH order, obtains the initial coverage level information, and obtains the PRACH resource corresponding to the level, including the time domain location and the frequency domain location.
  • the frequency domain location is determined by two parameters: nprach-SubcarrierOffset-r13 (PRACH start subcarrier) and nprach-NumSubcarriers-r13 (the number of PRACH carriers).
  • the initial coverage level is CEL0
  • the PRACH resource corresponding to CEL0 is obtained, and the period is 640 ms, the starting subframe offset is 8, the number of subcarriers is 12, and the range is 0-11, and random connection is initiated on CEL0.
  • the UE calculates the subcarrier ID used on the CEL0 according to the indicated Subcarrier indication of NPRACH, and the calculation method may be, but is not limited to:
  • Step S403 the PDCCH order end subframe is n, and the UE starts the PRACH on the determined PRACH resource, starting from the subframe with the index (n+9).
  • the subframe is used as the starting subframe to transmit the PRACH signal, and the used subcarrier ID is 6.
  • sf is the radio frame number and ns is the slot number. If the initiated random access procedure fails and the number of random access initiated on CEL0 is less than 3, then it is satisfied.
  • the subframe transmits the PRACH signal again as the starting subframe, and the used subcarrier ID is 6.
  • step S404 it is determined whether the random access is successful. If yes, step S406 is performed; otherwise, step S405 is performed.
  • Step S405 If the initiated random access procedure fails, the PRACH is sent again on the determined PRACH resource, and it is determined whether the number of times the PRACH is sent on the initial coverage level is less than the maximum random access number. If yes, step S407 is performed, otherwise, the process is performed. Step S406.
  • step S406 the random access process ends.
  • Step S407 The number of times the PRACH is sent on the initial coverage level is less than the number of random accesses of the coverage level. If the step S403 is performed, otherwise step S408 is performed.
  • the UE calculates the PRACH subcarrier ID it uses on the new coverage level.
  • the UE transmits the PRACH on the re-determined PRACH resource.
  • the subframe transmits the PRACH signal again as the starting subframe, and the used subcarrier ID is 18.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present application which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present application.
  • the NB-IoT system is configured with three coverage levels, namely CEL0, CEL1, and CEL2, of which CEL0 has the lowest coverage level.
  • the PRACH resource information of the three coverage levels is shown in Table 7.
  • Step 401 In the NB-IoT system, the eNodeB sends a PDCCH order, where the indicated PRACH information is as shown in Table 8, including the fields "Starting number of NPRACH repetitions" and "Subcarrier indication of NPRACH".
  • Step S402 The UE receives the PDCCH order, obtains the initial coverage level information, and obtains the PRACH resource corresponding to the level, including the time domain location and the frequency domain location.
  • the frequency domain location is determined by two parameters: nprach-SubcarrierOffset-r13 (PRACH start subcarrier) and nprach-NumSubcarriers-r13 (the number of PRACH carriers).
  • the initial coverage level is CEL0
  • the PRACH resource corresponding to CEL0 is obtained, and the period is 640 ms, the starting subframe offset is 8, the number of subcarriers is 12, and the range is 0-11, and random connection is initiated on CEL0.
  • the UE calculates the subcarrier ID used on the CEL0 according to the indicated Subcarrier indication of NPRACH, and the calculation method may be, but is not limited to:
  • Step S403 the PDCCH order end subframe is n, and the UE starts the PRACH on the determined PRACH resource, starting from the subframe with the index (n+9).
  • the subframe is used as the starting subframe to transmit the PRACH signal, and the used subcarrier ID is 6.
  • sf is the radio frame number and ns is the slot number. If the initiated random access procedure fails and the number of random access initiated on CEL0 is less than 3, then it is satisfied.
  • the subframe transmits the PRACH signal again as the starting subframe, and the used subcarrier ID is 6.
  • step S404 it is determined whether the random access is successful. If yes, step S406 is performed; otherwise, step S405 is performed.
  • Step S405 If the initiated random access procedure fails, the PRACH is sent again on the determined PRACH resource, and it is determined whether the number of times the PRACH is sent on the initial coverage level is less than the maximum random access number. If yes, step S407 is performed, otherwise, the process is performed. Step S406.
  • step S406 the random access process ends.
  • Step S407 The number of times the PRACH is sent on the initial coverage level is less than the number of random accesses of the coverage level. If the step S403 is performed, otherwise step S408 is performed.
  • the UE calculates the PRACH subcarrier ID it uses on the new coverage level.
  • the UE transmits the PRACH on the re-determined PRACH resource.
  • the subframe is transmitted as the initial subframe again, and the used subcarrier ID is 18.
  • a PRACH carrier that can be used for random access is configured at each coverage level.
  • the base station instructs the terminal to initiate a random access PRACH carrier, in addition to indicating the foregoing PRACH resource information.
  • the terminal initiates a random access failure on the initial coverage level specified by the base station and needs to improve the coverage level
  • the PRACH carrier indicated by the base station may not exist in the PRACH resource group of the high-level coverage level, and the terminal may not initiate random access.
  • the PRACH signal is sent on the PRACH resource indicated by the base station, but the base station does not respond. As a result, the random access fails, the success rate of the random access initiated by the base station is reduced, and the terminal is out of synchronization.
  • the target PRACH resource further includes a target carrier for transmitting the PRACH signal, where mapping the target PRACH resource from the available resources under the current coverage level according to the resource information includes: selecting a carrier list and resource information according to the current coverage level. The carrier index in the determination of the target carrier.
  • determining the target carrier according to the carrier index in the current coverage level and the carrier index in the resource information includes determining the current coverage level according to the non-anchor carrier list configured by the system and the PRACH resource configuration of different coverage levels on each carrier.
  • a target carrier list wherein the non-anchor carrier list is used to store the first non-anchor carrier, the second non-anchor carrier in the target carrier list is derived from the non-anchor carrier list, and each carrier in the target carrier list has An index;
  • the carrier numbered ID12 is used as the target carrier.
  • the system configures PRACH resources corresponding to each coverage level for each non-anchor carrier. According to the sequence in the non-anchor carrier list configured by the system, the non-anchor carriers of the PRACH resources configured with the current coverage level are sequentially grouped into the target carrier list according to their in the non-anchor carrier list.
  • each first non-anchor carrier in the non-anchor carrier list has a carrier sequence number, and in the target carrier list, the anchor in the list leader is anchored.
  • the carrier number of the carrier is 0, and the carrier number of the second non-anchor carrier is the same as the carrier number of the source carrier of the second non-anchor carrier in the non-anchor carrier list.
  • the carrier number of the anchor carrier located in the queue head of the list is 0, and the carrier sequence number of the second non-anchor carrier and the second non- The anchor carrier has the same index.
  • each first non-anchor carrier in the non-anchor carrier list has a carrier sequence number, and in the target carrier list, the anchor at the end of the list is at the end of the list.
  • the carrier number of the carrier is 0, and the carrier number of the second non-anchor carrier is the same as the carrier number of the source carrier of the second non-anchor carrier in the non-anchor carrier list.
  • each first non-anchor carrier in the non-anchor carrier list has a carrier sequence number
  • the carrier of the second non-anchor carrier The sequence number is the same as the carrier number of the source carrier of the second non-anchor carrier in the non-anchor carrier list, wherein the target carrier list does not include the anchor carrier.
  • the carrier sequence number of the second non-anchor carrier is the same as the index of the second non-anchor carrier, where the target carrier list does not include an anchor.
  • the anchor carrier is used as the target subcarrier, where the preset threshold is used to indicate that the anchor carrier is the target subcarrier.
  • Determining the target carrier according to the carrier list under the current coverage level includes: determining, according to the non-anchor carrier list ⁇ non-anchor carrier ID1, non-anchor carrier ID2, ... ⁇ configured by the system and the PRACH resource configuration of different coverage levels on each carrier.
  • the available carrier list A under the current coverage level, the carrier order in the list A is ⁇ anhor carrier, non-anchor carrier n1, non-anchor carrier n2, ... ⁇ , and the index number of the carrier in the list A is set in order according to the sorting order.
  • the carrier ID of the anhor carrier is 0, the carrier ID of the non-anchor carrier n1, the non-anchor carrier n2, ... is the corresponding in the non-anchor carrier list of the system configuration.
  • the carrier ID of the non-anchor carrier is the same or identical to the sequence of the non-anchor carrier list configured by the system.
  • the carrier with the index number ID12 in the carrier list A is used as the target carrier.
  • the available carrier list A under the current coverage level is determined according to the non-anchor carrier list ⁇ non-anchor carrier ID1, non-anchor carrier ID2, ... ⁇ configured by the system and the PRACH resource configuration of different coverage levels on each carrier.
  • the carrier sequence in A is ⁇ anhor carrier, non-anchor carrier n1, non-anchor carrier n2, ... ⁇ , and the index numbers of the carriers in list A are set to 0, 1, 2, ... in order.
  • the carrier ID of the anhor carrier, the non-anchor carrier n1, the non-anchor carrier n2, ... is its index number.
  • the ordering of the non-anchor carrier n1, the non-anchor carrier n2, ... is identical to the order in the non-anchor carrier list configured by the system.
  • the carrier with the index number ID12 in the carrier list A is used as the target
  • the available carrier list A under the current coverage level is determined according to the non-anchor carrier list ⁇ non-anchor carrier ID1, non-anchor carrier ID2, ... ⁇ configured by the system and the PRACH resource configuration of different coverage levels on each carrier.
  • the carrier order in A is ⁇ non-anchor carrier n1, non-anchor carrier n2, ..., anhor carrier ⁇ , and the index numbers of the carriers in list A are set to 0, 1, 2, ... in order.
  • the carrier ID of the anhor carrier is 0, the carrier ID of the non-anchor carrier n1, the non-anchor carrier n2, ...
  • the fourth index ID12 (ID11) mod(Num4) is calculated from the number of carriers Num4 and the carrier index ID11 in the carrier list A.
  • the carrier with the index number ID12 in the carrier list A is used as the target carrier.
  • the anchor carrier is used as the target subcarrier; if the carrier index ID11 is not a specific value, according to the non-anchor carrier list configured by the system ⁇ non-anchor carrier ID1, non-anchor carrier ID2, ... ⁇ Differently on each carrier
  • the coverage level PRACH resource configuration determines the available carrier list A under the current coverage level, and the carrier order in the list A is ⁇ non-anchor carrier n1, non-anchor carrier n2, ... ⁇ , which are the carriers in the list A in order of sorting.
  • Set the index number to 0, 1, 2, ....
  • the carrier with the index number ID12 in the carrier list A is used as the target carrier.
  • the anchor carrier is used as the target subcarrier; if the carrier index ID11 is not a specific value, according to the non-anchor carrier list configured by the system ⁇ non-anchor carrier ID1, non-anchor carrier ID2, ... ⁇ And the PRACH resource configuration with different coverage levels on each carrier determines the available carrier list A under the current coverage level, and the carrier sequence in the list A is sequentially ⁇ non-anchor carrier n1, non-anchor carrier n2, ... ⁇ , in order of sorting Set the index number to 0, 1, 2, ... for the carrier in list A.
  • the carrier ID of the non-anchor carrier n1, the non-anchor carrier n2, ... is its index number.
  • the ordering of the non-anchor carrier n1, the non-anchor carrier n2, ... is identical to the order in the non-anchor carrier list configured by the system.
  • the carrier with the index number ID12 in the carrier list A is used as the target carrier.
  • Table 9 shows the PRACH information indicated by the PDCCH order in the NB-IoT Rel-14 standard protocol.
  • the PRACH signal is sent on the anchor carrier to determine the subcarrier that transmits the PRACH; if the terminal is in the Rel-14 version, the terminal determines according to the PRACH carrier Index field indicated by the base station.
  • the PRACH carrier used for transmitting the PRACH signal on the current coverage level may be, but is not limited to:
  • the non-anchor carriers are numbered sequentially starting from 0 in the order of the non-anchor carrier list in the broadcast message, and the maximum number is Nnon-anchor; if there is an anchor carrier , the anchor carrier number is Nnon-anchor+1. The number is marked as index1; the number maximum value +1 is the number of PRACH carriers that the current coverage can be used to transmit the PRACH signal, Nprach_carrier;
  • the terminal only transmits the PRACH signal on the anchor carrier;
  • the PRACH carrier Index indicated by the system is not a specific value, then all non-anchor carriers that are available for transmitting the PRACH signal on the current coverage are determined: the non-anchor carriers are started from 0 in the order of the non-anchor carrier list in the broadcast message. Numbered sequentially. The number is marked as index1; the number maximum value +1 is the number of PRACH carriers that the current coverage can be used to transmit the PRACH signal, Nprach_carrier;
  • a PRACH carrier whose value is index2 in index1 and a PRACH carrier that transmits a PRACH signal to the terminal.
  • the PRACH carrier index indicated by the system is a specific value of 0, indicating that the system specifies to transmit a PRACH signal on the anchor carrier, and the terminal only transmits the PRACH signal on the anchor carrier;
  • the PRACH carrier Index indicated by the system is not a specific value, then determine all non-anchor carriers that can be used to transmit the PRACH signal on the current coverage: number the anchor carrier to 0; the non-anchor carrier according to the non-anchor carrier in the broadcast message The order in the list is numbered sequentially starting from 1. The number is marked as index1; the number maximum is the number of non-anhor PRACH carriers that are currently used to transmit the PRACH signal, Nprach_carrier;
  • a PRACH carrier whose value is index2 in index1 and a PRACH carrier that transmits a PRACH signal to the terminal.
  • the NB-IoT system is configured with three coverage levels, CEL0/CEL1/CEL2, of which CEL0 has the lowest coverage level.
  • CEL0/CEL1/CEL2 of which CEL0 has the lowest coverage level.
  • one anchor carrier and three non-anchor carriers are configured in the NB-IoT cell.
  • the PRACH resource information of these five carriers is as shown in Table 10.
  • Table 10 shows the PRACH information of the NB-IoT system broadcast configuration.
  • the eNodeB sends a PDCCH order, and the indicated PRACH information is as shown in Table 11.
  • the UE of Rel-14 receives the PDCCH order, obtains the initial coverage level as CEL0, and obtains the PRACH resource information corresponding to CEL0, and Table 12 shows the PRACH resource information of CEL0.
  • the number of PRACH carriers available on CEL0 is 4.
  • the carrier corresponding to the index value of 3 is found in index1 as the non-anchor carrier 3, and the PRACH carrier that transmits the PRACH signal for the UE.
  • the UE calculates the subcarrier ID used on the CEL0 according to the indicated Subcarrier indication of NPRACH, and the calculation method may be: but not limited to:
  • the subframe transmits the PRACH signal as the starting subframe, and the subcarrier ID used on the non-anchor carrier 3 is 6.
  • sf is the radio frame number and ns is the slot number.
  • the subframe transmits the PRACH signal again as the starting subframe, and the subcarrier ID used on the non-anchor carrier 3 is 6.
  • the UE raises the coverage level to CEL1, and obtains the PRACH resources corresponding to the level as shown in Table 13, showing the PRACH of CEL1. Resource information.
  • index1 [0,1,2]
  • index1 The index corresponding to the index value of 0 is found in index1 as an anchor carrier, and the PRACH carrier that transmits the PRACH signal for the UE.
  • the UE calculates the subcarrier ID used by the CEL1 according to the indicated Subcarrier indication of NPRACH, and the calculation method may be: but not limited to:
  • the subframe transmits the PRACH signal again as the starting subframe, and the anchor carrier is used, and the subcarrier ID is 18.
  • the NB-IoT system is configured with three coverage levels, CEL0/CEL1/CEL2, of which CEL0 has the lowest coverage level.
  • CEL0/CEL1/CEL2 of which CEL0 has the lowest coverage level.
  • one anchor carrier and three non-anchor carriers are configured in the NB-IoT cell.
  • the PRACH resource information of these five carriers is as shown in Table 14.
  • the eNodeB sends a PDCCH order, and the indicated PRACH information is as shown in Table 15.
  • Table 15 shows the PRACH information of the PDCCH order indication sent by the NB-IoT.
  • the UE of Rel-14 receives the PDCCH order, and the indicated PRACH carrier Index is not a specific value (assuming a specific value is 0), then the initial coverage level is obtained as CEL0, and CEL0 is obtained.
  • the PRACH resource information of the corresponding non-anchor carrier is as shown in Table 16, and Table 16 shows the PRACH resource information of the non-anchor carrier of CEL0.
  • the non-anchor carriers are numbered starting from 0 according to the carrier understanding order of the system broadcast configuration, the non-anchor carrier 1 number is 0, the non-anchor carrier 2 number is 1, the non-anchor carrier 3 number is 2; the number of 0-2
  • the number of non-anchor PRACH carriers available on CEL0 is 3.
  • the carrier corresponding to the index value of 0 is found in index1 as the non-anchor carrier 1, and the PRACH carrier that transmits the PRACH signal for the UE.
  • the UE calculates the subcarrier ID used on the CEL0 according to the indicated Subcarrier indicat of NPRACH, and the calculation method may be, but is not limited to:
  • the subframe transmits the PRACH signal as the starting subframe, and the subcarrier ID used on the non-anchor carrier 1 is 6.
  • sf is the radio frame number and ns is the slot number.
  • the subframe transmits the PRACH signal again as the starting subframe, and the subcarrier ID used on the non-anchor carrier 1 is 6.
  • the UE raises the coverage level to CEL1, and obtains the non-anchor PRACH resources corresponding to the level as shown in Table 17.
  • the number of non-anchor PRACH carriers available on CEL1 is 2.
  • a carrier whose index value is 1 is found in index1 as a non-anchor carrier 2, and a PRACH carrier that transmits a PRACH signal to the UE.
  • the UE calculates the subcarrier ID used by the CEL1 according to the indicated Subcarrier indication of NPRACH, and the calculation method may be: but not limited to:
  • the subframe is transmitted as the initial subframe again, and the non-anchor carrier 2 is used, and the subcarrier ID is 18.
  • the NB-IoT system is configured with three coverage levels, CEL0/CEL1/CEL2, of which CEL0 has the lowest coverage level.
  • CEL0/CEL1/CEL2 of which CEL0 has the lowest coverage level.
  • one anchor carrier and three non-anchor carriers are configured in the NB-IoT cell.
  • the PRACH resource information of these five carriers is as shown in Table 18.
  • Table 18 shows the PRACH information of the NB-IoT system broadcast configuration.
  • the eNodeB sends a PDCCH order, and the indicated PRACH information is as shown in Table 19.
  • Table 19 shows the PRACH information of the PDCCH order indication sent by the NB-IoT.
  • the UE of the Rel-14 receives the PDCCH order, and the indicated PRACH carrier index is not a specific value (assuming a specific value is 0), and the initial coverage level is CEL0, and the PRACH resource information of the non-anchor carrier corresponding to the CEL0 is obtained. 20 shows PRACH resource information of a non-anchor carrier of CEL0.
  • the anchor carrier number is 0; the non-anchor carrier is numbered starting from 1 according to the carrier understanding order of the system broadcast configuration, the non-anchor carrier 1 number is 1, the non-anchor carrier 2 number is 2, and the non-anchor carrier 3 number is 3.
  • the number of non-anchor PRACH carriers available on CEL0 is 3.
  • the index corresponding to the index value 1 is found in index1 as the non-anchor carrier 1, and the PRACH carrier that transmits the PRACH signal to the UE.
  • the UE calculates the subcarrier ID used on the CEL0 according to the indicated Subcarrier indication of NPRACH, and the calculation method may be: but not limited to:
  • the subframe transmits the PRACH signal as the starting subframe, and the subcarrier ID used on the non-anchor carrier 1 is 6.
  • sf is the radio frame number and ns is the slot number.
  • the UE raises the coverage level to CEL1 and obtains the non-anchor PRACH resources corresponding to the level, and Table 21 shows CEL1. PRACH resource information of the non-anchor carrier.
  • the non-anchor carriers are numbered starting from 0 according to the carrier understanding order of the system broadcast configuration in Table 5.
  • index1 [0,1] corresponding to ⁇ non-anchor carrier 1, non-anchor carrier 2 ⁇ .
  • the number of non-anchor PRACH carriers available on CEL1 is 2.
  • a carrier whose index value is 1 is found in index1 as a non-anchor carrier 2, and a PRACH carrier that transmits a PRACH signal to the UE.
  • the UE calculates the subcarrier ID used by the CEL1 according to the indicated Subcarrier indication of NPRACH, and the calculation method may be: but not limited to:
  • the subframe is transmitted as the initial subframe again, and the non-anchor carrier 2 is used, and the subcarrier ID is 18.
  • the NB-IoT system is configured with three coverage levels, CEL0/CEL1/CEL2, of which CEL0 The coverage level is the lowest.
  • CEL0 The coverage level is the lowest.
  • one anchor carrier and three non-anchor carriers are configured in the NB-IoT cell.
  • the PRACH resource information of these five carriers is as shown in Table 22.
  • Table 22 shows the PRACH information of the NB-IoT system broadcast configuration.
  • the eNodeB sends a PDCCH order, and the indicated PRACH information is as shown in Table 23.
  • the UE of the Rel-14 receives the PDCCH order, and the indicated PRACH carrier index is a specific value of 0 (assuming a specific value is 0), then the initial coverage level is CEL0, and the PRACH resource information of the anchor carrier corresponding to the CEL0 is obtained. As shown, Table 24 shows the PRACH resource information of the anchor carrier of CEL0.
  • the UE calculates the subcarrier ID used on the CEL0 according to the indicated Subcarrier indication of NPRACH, and the calculation method may be: but not limited to:
  • the subframe transmits the PRACH signal as the starting subframe, and the subcarrier ID used on the anchor carrier is 6.
  • sf is the radio frame number and ns is the slot number.
  • the subframe transmits the PRACH signal again as the starting subframe, and the subcarrier ID used on the anchor carrier is 6.
  • the UE raises the coverage level to CEL1, and obtains the anchor PRACH resources corresponding to the level as shown in Table 25.
  • the UE calculates the subcarrier ID used by the CEL1 according to the indicated Subcarrier indication of NPRACH, and the calculation method may be: but not limited to:
  • the subframe transmits the PRACH signal again as the starting subframe, and the anchor carrier is used, and the subcarrier ID is 18.
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be through hardware, but in many cases the former is a better implementation.
  • the technical solution of the present application which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present application.
  • a random access device in a wireless communication system is also provided in the present application.
  • the device is used to implement the above embodiments and preferred embodiments, and the description thereof has been omitted.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • the apparatus may include: a receiving unit 51, a determining unit 52, and a transmitting unit 53.
  • the receiving unit 51 is configured to receive indication information sent by the mobile base station, where the indication information is used to indicate that the user terminal initiates random access.
  • the determining unit 52 is configured to determine a target PRACH resource from the available resources based on the current coverage level and the resource information carried in the indication information, where the target PRACH resource is used to send a PRACH signal, and the PRACH signal is used to initiate random access, and the current coverage level is The coverage level at which random access is currently to be initiated.
  • the sending unit 53 is configured to: when the random access failure is initiated on the target PRACH resource, re-determine the target PRACH resource from the available resources based on the updated coverage level and resource information, and send the PRACH on the re-determined target PRACH resource. signal
  • the receiving unit receives the indication information sent by the mobile base station, where the indication information is used to indicate that the user terminal initiates the random access, and the determining unit determines the target PRACH resource from the available resources based on the current coverage level and the resource information carried in the indication information.
  • Target PRACH resources The PRACH signal is used to initiate a random access, and the sending unit re-determines the target PRACH resource from the available resources based on the updated coverage level and resource information when the random access failure is initiated on the target PRACH resource.
  • the PRACH signal is sent on the re-determined target PRACH resource, thereby solving the technical problem that the random access success rate initiated by the mobile base station in the related art is low, and the technical effect of improving the random access success rate is achieved.
  • the receiving unit When the receiving unit receives the indication information sent by the mobile base station, it may be the indication information that is received as the PDCCH order information.
  • the target PRACH resource may be mapped from the available resources under the current coverage level according to the resource information.
  • the target PRACH resource may be determined according to a manner corresponding to a system type of the mobile base station.
  • the target PRACH resource includes a target time-frequency domain resource and a target codeword for transmitting the PRACH signal
  • the determining unit includes: a second determining module, configured to use the available time according to the current coverage level.
  • the resource quantity of the frequency domain resource and the time-frequency resource index in the resource information determine the target time-frequency domain resource; and the third determining module is configured to use the start codeword, the end codeword, and the resource information of the preamble under the current coverage level.
  • the preamble index determines the target codeword.
  • the target PRACH resource is included for Sending a PRACH signal target subcarrier
  • the determining unit includes: a fourth determining module, configured to determine a target subcarrier according to the number of subcarriers in the current coverage level, the index of the starting subcarrier, and the subcarrier or the wave offset in the resource information .
  • the third index ID8 ID7+(Num3-ID10) mod(Num2);; the subcarrier corresponding to ID8 is used as the target subcarrier.
  • the sending unit includes: an obtaining module, configured to acquire a number of failures of initiating random access; and a first determining module, configured to determine, when the number of failures reaches a preset value, a random access failure initiated on the target PRACH resource
  • the preset value is the maximum number of times the PRACH signal is allowed to be transmitted under the current coverage level.
  • the sending unit further includes: a sending module, configured to: after obtaining the number of failures of initiating the random access, resending the PRACH signal on the target PRACH resource if the number of failures is less than a preset value.
  • a sending module configured to: after obtaining the number of failures of initiating the random access, resending the PRACH signal on the target PRACH resource if the number of failures is less than a preset value.
  • the updated coverage level is one level higher than the coverage level before the update.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the above modules are in any combination.
  • the forms are located in different processors.
  • Embodiments of the present application also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the following steps:
  • the target PRACH resource is determined from the available resources based on the current coverage level and the resource information carried in the indication information, where the target PRACH resource is used to send a PRACH signal, and the PRACH signal is used to initiate random access;
  • the target PRACH resource is re-determined from the available resources based on the updated coverage level and resource information, and the PRACH signal is sent on the re-determined target PRACH resource.
  • the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • a mobile hard disk e.g., a hard disk
  • magnetic memory e.g., a hard disk
  • the processor performs: receiving, according to the stored program code in the storage medium, the indication information sent by the mobile base station, where the indication information is used to indicate that the user terminal initiates random access; based on the current coverage level and The resource information carried in the indication information determines the target PRACH resource from the available resources, where the target PRACH resource is used to send the PRACH signal, and the PRACH signal is used to initiate the random access; when the random access fails to be initiated on the target PRACH resource And re-determining the target PRACH resource from the available resources based on the updated coverage level and resource information, and transmitting the PRACH signal on the re-determined target PRACH resource.
  • modules or steps of the present application can be implemented by a general computing device, which can be concentrated on a single computing device or distributed in a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the application is not limited to any particular combination of hardware and software.

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Abstract

本申请提供了一种无线通信系统中的随机接入方法和装置、用户终端。其中，该方法包括：接收移动基站发送的指示信息，指示信息用于指示用户终端发起随机接入；基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定PRACH资源，PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入；当在PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定PRACH资源，并在重新确定的PRACH资源上发送PRACH信号。本申请解决了相关技术中移动基站发起的随机接入成功率较低的技术问题。

Description

无线通信系统中的随机接入方法和装置、用户终端 技术领域
本申请涉及通信领域，具体而言，涉及一种无线通信系统中的随机接入方法和装置、用户终端。
背景技术
在无线通信系统，例如eMTC(enhanced Machine Type Communication，增强MTC)和NB-IoT(NarrowBand Internet of Things，窄带物联网)标准协议中，支持由eNodeB(evolved Node B，演进型基站)发起的随机接入过程，比如eNodeB通过下发PDCCH order(PDCCH Physical Downlink Control Channel,物理下行控制信道)指示用户设备UE(User Equipment)发起随机接入过程。此时，eNodeB会指示UE使用的PRACH(Physical Random Access Channel,随机接入信道)资源信息(表1所示为PDCCH order指示的PRACH信息)。当UE收到eNodeB的指令后，即在eNodeB指定的资源上发送PRACH，对于eMTC系统，UE使用eNodeB指定的Preamble(即前导码)码字发送PRACH。
表1
Figure PCTCN2017078184-appb-000001
在eMTC和NB-IoT系统中，PRACH资源是根据覆盖等级配置的，每个覆盖等级都对应一组PRACH时频资源、PRACH重复次数、随机接入次数，eMTC系统还会为每个覆盖配置一组preamble码字。
对于eNodeB发起的随机接入过程，eNodeB指示的PRACH资源索引或 子载波ID或preamble码字一定在初始覆盖等级的PRACH资源组中，以保证UE在初始覆盖等级上按照eNodeB指示的PRACH资源发起随机接入过程。但当UE在eNodeB指定的PRACH资源上多次发起随机接入失败需要提升覆盖等级时，eNodeB指示的PRACH资源索引或子载波ID或preamble码字在高一等级的PRACH资源组中可能并不存在，此时UE无法发起随机接入，或者按照eNodeB中指示的PRACH信息发送PRACH，但eNodeB不会响应，结果都将导致随机接入失败，降低了eNodeB发起的随机接入成功率。
针对相关技术中移动基站发起的随机接入成功率较低的技术问题，目前尚未提出有效的解决方案。
发明内容
本申请提供了一种无线通信系统中的随机接入方法和装置、用户终端，以至少解决相关技术中移动基站发起的随机接入成功率较低的技术问题。
根据本申请的一个方面，提供了一种无线通信系统中的随机接入方法，该方法包括：接收移动基站发送的指示信息，其中，指示信息用于指示用户终端发起随机接入；基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，其中，目标PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入，当前覆盖等级为当前要发起随机接入的覆盖等级，可用资源为当前覆盖等级下允许被使用的资源；当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH资源，并在重新确定的目标PRACH资源上发送PRACH信号。
可选地，通过如下方式确定在目标PRACH资源上发起的随机接入失败：获取发起随机接入的失败次数；在失败次数达到预设值的情况下，确定在目标PRACH资源上发起的随机接入失败，其中，预设值为在当前覆盖等级下，允许发送PRACH信号的次数最大值。
可选地，该方法还包括：在获取发起随机接入的失败次数之后，在失败次数小于预设值的情况下，在目标PRACH资源上重新发送PRACH信号。
可选地，更新后的覆盖等级比更新前的覆盖等级高一个等级。
可选地，目标PRACH资源包括用于发送PRACH信号的目标时频域资源、目标码字及目标子载波，基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源包括：根据资源信息从当前覆盖等级下的可用资源中映射出目标PRACH资源。
可选地，在无线通信系统为eMTC系统的情况下，根据资源信息从当前覆盖等级下的可用资源中映射出目标PRACH资源包括：根据当前覆盖等级下的可用时频域资源的资源数量和资源信息中的时频资源索引确定目标时频域资源；和/或，根据当前覆盖等级下的前导码的起始码字、结束码字及资源信息中的前导码索引确定目标码字。
可选地，根据当前覆盖等级下的可用时频域资源的资源数量和资源信息中的时频资源索引确定目标时频域资源包括：使用预设公式，根据可用时频域资源的资源数量Num1和资源信息中的时频资源索引ID1计算第一索引ID2，其中，预设公式为ID2＝(ID1-K1)mod(Num1)+K2，或，ID2＝(ID1)mod(Num1)+K3，K1、K2、K3为常数；将与ID2对应的时频资源作为目标时频域资源。
可选地，根据当前覆盖等级下的前导码的起始码字、结束码字及资源信息中的前导码索引确定目标码字包括：根据起始码字的索引ID3、结束码字的索引ID4及前导码索引ID5计算第二索引ID6＝ID3+(ID5)mod(ID4-ID3+1)，或者，根据起始码字的索引ID3、结束码字的索引ID4及前导码索引ID5、指示信息指示的覆盖等级对应的起始码字索引ID9来计算第二索引ID6＝ID3+(ID5-ID9)mod(ID4-ID3+1)；将与ID6对应的码字作为目标码字。
可选地，在无线通信系统为NB-IoT系统的情况下，根据资源信息从当前覆盖等级下的可用资源中映射出目标PRACH资源包括：根据当前覆盖等级下的子载波数量、起始子载波的索引及资源信息中的子载波索引或者偏移确定目标子载波。
可选地，根据当前覆盖等级下的子载波和资源信息中的子载波索引或者偏移确定目标子载波包括：根据当前覆盖等级下的子载波数量Num2、起始子载波的索引ID7及资源信息中的子载波偏移Num3计算第三索引ID8＝ID7+(Num3)mod(Num2)，或者，根据当前覆盖等级下的子载波数量Num2、起始子载波的索引ID7及资源信息中的子载波索引Num3、指示信息中指示的覆盖等级对应的起始在载波索引ID10计算第三索引ID8＝ID7+(Num3-ID10)mod(Num2)；将与ID8对应的子载波作为目标子载波。
可选地，在无线通信系统为eMTC系统或NB-IoT系统的情况下，指示信息为PDCCH order信息。
可选地，在无线通信系统为eMTC系统的情况下，指示信息为切换信息。
根据本申请的另一个方面，提供了一种无线通信系统中的随机接入装置，该装置包括：接收单元，用于接收移动基站发送的指示信息，其中，指示信息用于指示用户终端发起随机接入；确定单元，用于基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，其中，目标PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入，当前覆盖等级为当前要发起随机接入的覆盖等级；发送单元，用于当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH资源，并在重新确定的目标PRACH资源上发送PRACH信号。
可选地，发送单元包括：获取模块，用于获取发起随机接入的失败次数；第一确定模块，用于在失败次数达到预设值的情况下，确定在目标PRACH资源上发起的随机接入失败，其中，预设值为在当前覆盖等级下，允许发送PRACH信号的次数最大值。
可选地，发送单元还包括：发送模块，用于在获取发起随机接入的失败次数之后，在失败次数小于预设值的情况下，在目标PRACH资源上重新发送PRACH信号。
可选地，更新后的覆盖等级比更新前的覆盖等级高一个等级。
可选地，目标PRACH资源包括用于发送PRACH信号的目标时频域资源、目标码字及目标子载波，确定单元还用于根据资源信息从当前覆盖等级下的可用资源中映射出目标PRACH资源。
可选地，在无线通信系统为eMTC系统的情况下，确定单元包括：第二确定模块，用于根据当前覆盖等级下的可用时频域资源的资源数量和资源信息中的时频资源索引确定目标时频域资源；第三确定模块，用于根据当前覆盖等级下的前导码的起始码字、结束码字及资源信息中的前导码索引确定目标码字。
可选地，第二确定模块还用于：使用预设公式，根据可用时频域资源的资源数量Num1和资源信息中的时频资源索引ID1计算第一索引ID2，预设公式为ID2＝(ID1-K1)mod(Num1)+K2，或，ID2＝(ID1)mod(Num1)+K3，K1、K2、K3为常数；将与ID2对应的时频资源作为目标时频域资源。
可选地，第三确定模块还用于:根据起始码字的索引ID3、结束码字的索引ID4及前导码索引ID5计算第二索引ID6＝ID3+(ID5)mod(ID4-ID3+1)，或者，根据起始码字的索引ID3、结束码字的索引ID4及前导码索引ID5、指示信息指示的覆盖等级对应的起始码字索引ID9来计算第二索引ID6＝ID3+(ID5-ID9)mod(ID4-ID3+1)；将与ID6对应的码字作为目标码字。
可选地，在无线通信系统为NB-IoT系统的情况下，确定单元包括：第四确定模块，用于根据当前覆盖等级下的子载波数量、起始子载波的索引及资源信息中的子载波索引或者偏移确定目标子载波。
可选地，第四确定模块还用于根据当前覆盖等级下的子载波数量Num2、起始子载波的索引ID7及资源信息中的子载波偏移Num3计算第三索引ID8＝ID7+(Num3)mod(Num2)，或者，根据当前覆盖等级下的子载波数量Num2、起始子载波的索引ID7及资源信息中的子载波索引Num3、指示信息中指示的覆盖等级对应的起始在载波索引ID10计算第三索引ID8＝ID7+(Num3-ID10)mod(Num2)；将与ID8对应的子载波作为目标子载波。
可选地，在无线通信系统为eMTC系统或NB-IoT系统的情况下，指示信息为PDCCH order信息。
可选地，在无线通信系统为eMTC系统的情况下，指示信息为切换信息。
根据本申请的另一个方面，提供了一种用户终端，用户终端包括：存储器，存储器中存储有包括如下步骤的代码：接收移动基站发送的指示信息，其中，指示信息用于指示用户终端发起随机接入；基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，其中，目标PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入；当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH资源，并在重新确定的目标PRACH资源上发送PRACH信号；处理器，处理器用于执行存储器中存储的代码；传输装置，分别与存储器和处理器连接，用于将存储器中的代码传输至处理器。
根据本申请的另一个实施例，提供了一种存储介质，存储介质可以被设置为存储用于执行以下步骤的程序代码：接收移动基站发送的指示信息，其中，指示信息用于指示用户终端发起随机接入；基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，其中，目标PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入；当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH资源，并在重新确定的目标PRACH资源上发送PRACH信号。
在本申请中，接收移动基站发送的指示信息，指示信息用于指示用户终端发起随机接入；基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，目标PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入；当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH 资源，并在重新确定的目标PRACH资源上发送PRACH信号,从而解决了相关技术中移动基站发起的随机接入成功率较低的技术问题，实现了提高随机接入成功率的技术效果。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1是根据本申请的可选的用户终端的示意图；
图2是根据本申请的无线通信系统中的随机接入的流程图；
图3是根据本申请的可选的无线通信系统中的随机接入的流程图；
图4是根据本申请的可选的无线通信系统中的随机接入的流程图；
图5是根据本申请的无线通信系统中的随机接入装置的示意图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本申请。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
实施例1
本申请实施例一所提供的方法实施例可以在用户终端、计算机终端或者类似的运算装置中执行。以运行在用户终端上为例，如图1所示，用户终端可以包括一个或多个(图中仅示出一个)处理器101(处理器101可以包括但不限于微处理器MCU或可编程逻辑器件FPGA等的处理装置)、用于存储数据的存储器103、以及用于通信功能的传输装置105。本领域普通技术人员可以理解，图1所示的结构仅为示意，其并不对上述电子装置 的结构造成限定。
存储器103可用于存储应用软件的软件程序以及模块，如本申请中的设备的控制方法对应的程序指令/模块，处理器101通过运行存储在存储器103内的软件程序以及模块，从而执行各种功能应用以及数据处理，即实现上述的方法。存储器可包括高速随机存储器，还可包括非易失性存储器，如一个或者多个磁性存储装置、闪存、或者其他非易失性固态存储器。在一些实例中，存储器可进一步包括相对于处理器远程设置的存储器，这些远程存储器可以通过网络连接至计算机终端。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。
需要说明的是，存储器中存储有包括如下步骤的代码：接收移动基站发送的指示信息，其中，指示信息用于指示用户终端发起随机接入；基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，其中，目标PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入，当前覆盖等级为当前要发起随机接入的覆盖等级；当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH资源，并在重新确定的目标PRACH资源上发送PRACH信号。
传输装置用于经由一个网络接收或者发送数据。上述的网络具体实例可包括计算机终端的通信供应商提供的无线网络。在一个实例中，传输装置包括一个网络适配器(Network Interface Controller，NIC)，其可通过基站与其他网络设备相连从而可与互联网进行通讯。在一个实例中，传输装置可以为射频(Radio Frequency，RF)模块，其用于通过无线方式与互联网进行通讯。
根据本申请，提供了一种无线通信系统中的随机接入的方法实施例，需要说明的是，在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行，并且，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
图2是根据本申请的无线通信系统中的随机接入的流程图，如图2所示，该方法包括如下步骤：
步骤S201，接收移动基站发送的指示信息，指示信息用于指示用户终端发起随机接入。
步骤S202，基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，目标PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入，当前覆盖等级为当前要发起随机接入的覆盖等级，可用资源为当前覆盖等级下允许被使用的资源。
步骤S203，当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH资源，并在重新确定的目标PRACH资源上发送PRACH信号。
通过上述实施例，接收移动基站发送的指示信息，指示信息用于指示用户终端发起随机接入；基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，目标PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入；当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH资源，并在重新确定的目标PRACH资源上发送PRACH信号,从而解决了相关技术中移动基站发起的随机接入成功率较低的技术问题，实现了提高随机接入成功率的技术效果。
可选地，上述步骤的执行主体可以为用户终端等，但不限于此。
在步骤S201中，接收移动基站发送的指示信息时，指示信息包括PDCCH order信息，也即基站eNodeB可以通过PDCCH order来发送指示信息，但不限于此，在其它类型的基站中可以采用类似的消息来发送。
在步骤S202中，在基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源时，根据资源信息从当前覆盖等级下的可用资源中映射出目标PRACH资源。可以根据与移动基站的系统类型对应的方式来确定目标PRACH资源。
在无线通信系统为eMTC系统的情况下，目标PRACH资源包括用于发送PRACH信号的目标时频域资源和目标码字，基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源包括：根据当前覆盖等级下的可用时频域资源的资源数量和资源信息中的时频资源索引确定目标时频域资源；和/或，根据当前覆盖等级下的前导码的起始码字、结束码字及资源信息中的前导码索引确定目标码字。
可选地，根据当前覆盖等级下的可用时频域资源的资源数量和资源信息中的时频资源索引确定目标时频域资源包括：使用预设公式，根据可用时频域资源的资源数量Num1和资源信息中的时频资源索引ID1计算第一索引ID2，预设公式为ID2＝(ID1-K1)mod(Num1)+K2，ID2＝(ID1)mod(Num1)+K3，K1、K2、K3为常数；将与ID2对应的时频资源作为目标时频域资源。
上述的“mod”表示取模运算。
根据当前覆盖等级下的前导码的起始码字、结束码字及资源信息中的前导码索引确定目标子载波包括：根据起始码字的索引ID3、结束码字的索引ID4及前导码索引ID5计算第二索引ID6＝ID3+(ID5)mod(ID4-ID3+1)，或者，根据起始码字的索引ID3、结束码字的索引ID4及前导码索引ID5、指示信息指示的覆盖等级对应的起始码字索引ID9来计算第二索引ID6＝ID3+(ID5-ID9)mod(ID4-ID3+1)；将与ID6对应的码字作为目标码字。
在无线通信系统为NB-IoT系统的情况下，目标PRACH资源包括用于发送PRACH信号目标子载波，基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源包括：根据当前覆盖等级下的子载波数量、起始子载波的索引及资源信息中的子载波索引或者偏移确定目标子载波。
可选地，根据当前覆盖等级下的子载波和资源信息中的子载波索引或者偏移确定目标子载波包括：根据当前覆盖等级下的子载波数量Num2、起始子载波的索引ID7及资源信息中的子载波偏移Num3计算第三索引 ID8＝ID7+(Num3)mod(Num2)，或者，根据当前覆盖等级下的子载波数量Num2、起始子载波的索引ID7及资源信息中的子载波索引Num3、指示信息中指示的覆盖等级对应的起始在载波索引ID10计算第三索引ID8＝ID7+(Num3-ID10)mod(Num2)；将与ID8对应的子载波作为目标子载波。
在步骤S203中，可通过如下方式确定在目标PRACH资源上发起的随机接入失败：获取发起随机接入的失败次数；在失败次数达到预设值的情况下，确定在目标PRACH资源上发起的随机接入失败，其中，预设值为在当前覆盖等级下，允许发送PRACH信号的次数最大值。
需要说明的是，在获取发起随机接入的失败次数之后，在失败次数小于预设值的情况下，可在目标PRACH资源上重新发送PRACH信号，直至失败的次数达到上述预设值；更新后的覆盖等级比更新前的覆盖等级高一个等级。
下面结合图3和图4所记载的实施方式详述本申请的实施例。
实施方式1
需要说明的是，eMTC FDD系统配置了四个覆盖等级，分别为CEL0/CEL1/CEL2/CEL2，其中CEL0的覆盖等级最低。四个覆盖等级的PRACH资源信息如表2所示。
表2
Figure PCTCN2017078184-appb-000002
根据36.211协议，上述PRACH配置索引对应的PRACH时域资源(无线帧号和子帧号)如表3所示。
表3
PRACH配置索引 无线帧号 子帧号
3 Any 1
6 Any 1,6
9 Any 1,4,7
12 Any 0,2,4,6,8
步骤S301，在eMTC系统中，eNodeB指示UE发起随机接入(如下发PDCCH order)，指示的RPACH资源信息包括：初始覆盖等级和Subcarrier indication of NPRACH(即子载波索引)。在eNodeB下发的PDCCH order中，指示的PRACH信息的含义如表4所示。
表4
Figure PCTCN2017078184-appb-000003
步骤S302，UE收到PDCCH order，获取初始覆盖等级信息，并获取该等级对应的PRACH资源，包括时域位置、频域位置和Preamble码字，可用的PRACH时频资源数目为NPRACH。
如，UE根据初始覆盖等级获取PRACH资源组的时频资源信息、重复次数；UE根据Subcarrier indication of NPRACH和初始覆盖等级可用的PRACH子载波数目，计算其使用的PRACH子载波ID。
步骤S303，UE在确定的PRACH资源上发送PRACH。
如果eNodeB下发的PRACH Mask Index(时频域资源索引)在1-10范围内，UE根据PRACH Mask Index和PRACH时频资源数目(NPRACH)，通过取模运算(mod)计算确定其使用的UE Mask Index(目标时频域资源索引)：
UE Mask Index＝(PRACH Mask Index-1)mod(NPRACH)+1，
或者，UE Mask Index＝(PRACH Mask Index)mod(NPRACH)+1。
PRACH资源数目根据36.211协议中的PRACH资源配置获得。
PRACH Mask Index字段为其他值时，遵循36.321协议的定义。
UE根据eNodeB下发的Preamble Index(码索引)和Preamble码字个数(NPreamble)计算其使用的Preamble ID(目标子载波索引)：
Preamble ID＝(firstPreamble-r13)+(Preamble Index)mod(NPreamble)，
NPreamble＝(lastPreamble-r13)-(firstPreamble-r13)+1，
其中，firstPreamble-r13为“36.331”协议中的信元，为当前覆盖的起始Preamble码字；lastPreamble-r13为“36.331”协议中中的信元，为当前覆盖等级使用的最后一个Preamble码字。
UE根据上述步骤确定的PRACH和Preamble码字发送PRACH。
步骤S304，判断随机接入是否成功，若是则执行步骤S306，否则执行步骤S305。
步骤S305，如果发起的随机接入过程失败，则在确定的PRACH资源上再次发送PRACH,并判断在初始覆盖等级上发送PRACH的次数是否小于最大随机接入次数，若是则执行步骤S307，否则执行步骤S306。
例如，UE收到PDCCH order，获取初始覆盖等级为CEL1，并获取CEL1对应的PRACH资源，PRACH配置索引为9，即在每个无线帧的子帧1、4、7上发送Preamble码，这个配置下可用PRACH资源数NPRACH为3；PRACH起始子帧周期为4个子帧；PRACH频域起始PRB为PRB＝0；Preamble码个数为12、范围为12-23；在CEL1上发起随机接入次数为min(3,20)＝3次。
UE根据PDCCH order指示的PRACH Mask Index计算其使用的UE Mask Index＝(PRACH Mask Index-1)mod NPRACH+1＝(3-1)mod 3+1＝3；根据36.321和36.211标准协议，在每个无线帧的子帧7上发送Preamble码。根据PRACH起始子帧周期为4个子帧，UE在满足
Figure PCTCN2017078184-appb-000004
的子帧上发送Preamble码。这里，sf为无线帧号，ns为时隙号。UE根据PDCCH order中Preamble Index计算其使用的UE Mask Index＝12+15 mod 12＝15；UE在确定的子帧、PRB＝0的PRACH资源上发送Preamble码字15。 如果发起的随机接入过程失败，且在CEL0上发起随机接入次数小于3，则在满足
Figure PCTCN2017078184-appb-000005
的子帧、PRB＝0的PRACH资源上再次发送Preamble码字15。
步骤S306，随机接入过程结束。
步骤S307，在初始覆盖等级上发送PRACH次数是否小于该覆盖等级的随机接入次数，若是指执行步骤S303，否则执行步骤S308。
步骤S308，如果在当前覆盖等级上发送PRACH的次数＝max(NumPreambleAttemptCE-r13)(即当前覆盖的随机接入次数)、且当前覆盖等级上发送PRACH次数<num(RepetitionsPerPreambleAttempt-r13)(即最大随机接入次数)，则将覆盖等级提高一个等级，重新执行步骤S303。
获取该等级对应的PRACH资源，包括时域位置、频域位置和Preamble码字。
UE根据当前覆盖等级获取PRACH资源组的时频资源信息、重复次数；UE根据Subcarrier indication of NPRACH和当前覆盖等级可用的PRACH子载波数目，计算其使用的PRACH子载波ID。
UE在新的覆盖等级计算其使用的PRACH UE Mask Index和Preamble ID，UE在确定的PRACH资源上发送PRACH。
例如，如果在CEL1上发起随机接入次数达到3次(还未达到总次数门限20次)，那么UE将覆盖等级提升至CEL2，并获取该等级对应的PRACH资源：PRACH配置索引为6，即在每个无线帧的子帧1、6上发送Preamble码，这个配置下可用PRACH资源数Nprach为2；PRACH起始子帧周期为8个子帧；PRACH频域起始PRB为PRB＝0；Preamble码个数为12、范围为24-35；在CEL2上发起随机接入次数为min(3,20-3)＝3次。
UE根据PDCCH order指示的PRACH Mask Index计算其使用的UE Mask Index＝(3-1)mod 2+1＝1；根据36.321和36.211标准协议，即在每个无线帧的子帧1上发送Preamble码。根据PRACH起始子帧周期为8个子帧，UE在满足
Figure PCTCN2017078184-appb-000006
的子帧上发送Preamble码。这里，sf为无线帧号，ns为时隙号。UE根据PDCCH order中Preamble Index计算其 使用的preamble index(即Preamble ID)为24+15 mod 12，即27。UE在确定的子帧、PRB＝0的PRACH资源上发送Preamble码字27。重复上述步骤，直到随机接入成功，或者达到最大重复次数min(3+3+3,20)＝9。
可选地，UE收到PDCCH order，获取初始覆盖等级为CEL1，并获取CEL1对应的PRACH资源：PRACH配置索引为9，即在每个无线帧的子帧1、4、7上发送Preamble码，这个配置下可用PRACH资源数Nprach为3；PRACH起始子帧周期为4个子帧；PRACH频域起始PRB为PRB＝0；Preamble码个数为12、范围为12-23；在CEL1上发起随机接入次数为min(3,20)＝3次。UE根据PDCCH order指示的PRACH Mask Index计算其使用的mask index：mask index＝PRACH Mask Index mod Nprach+1＝3 mod 3+1＝1；根据36.321和36.211标准协议，mask Index＝3，即在每个无线帧的子帧7上发送Preamble码。根据PRACH起始子帧周期为4个子帧，UE在满足
Figure PCTCN2017078184-appb-000007
的子帧上发送Preamble码。这里，sf为无线帧号，ns为时隙号。
UE根据PDCCH order中Preamble Index计算其使用的preamble index：preamble index＝12+Preamble Index mod 12＝12+15 mod 12＝15；UE在确定的子帧、PRB＝0的PRACH资源上发送Preamble码字15。如果发起的随机接入过程失败，且在CEL0上发起随机接入次数小于3，则在满足
Figure PCTCN2017078184-appb-000008
的子帧、PRB＝0的PRACH资源上再次发送Preamble码字15。
如果在CEL1上发起随机接入次数达到3次(还未达到总次数门限20次)，那么UE将覆盖等级提升至CEL2，并获取该等级对应的PRACH资源：PRACH配置索引为6，即在每个无线帧的子帧1、6上发送Preamble码，这个配置下可用PRACH资源数NPRACH为2；PRACH起始子帧周期为8个子帧；PRACH频域起始PRB为PRB＝0；Preamble码个数为12、范围为24-35；在CEL2上发起随机接入次数为min(3,20-3)＝3次。
UE根据PDCCH order指示的PRACH Mask Index计算其使用的mask index＝(PRACH Mask Index-1)mod NPRACH+1＝(3-1)mod 2+1＝1；根据36.321和36.211标准协议，mask Index＝1，即在每个无线帧的子帧1上发送Preamble码。
根据PRACH起始子帧周期为8个子帧，UE在满足
Figure PCTCN2017078184-appb-000009
Figure PCTCN2017078184-appb-000010
的子帧上发送Preamble码。这里，sf为无线帧号，ns为时隙号。
UE根据PDCCH order中Preamble Index计算其使用的Preamble index＝24+Preamble Index mod 12＝24+15 mod 12＝27；UE在确定的子帧、PRB＝0的PRACH资源上发送Preamble码字27。重复上述步骤，直到随机接入成功，或者达到最大重复次数min(3+3+3,20)＝9。
实施方式2
需要说明的是，NB-IoT系统配置了三个覆盖等级，分别为CEL0/CEL1/CEL2，其中CEL0的覆盖等级最低。三个覆盖等级的PRACH资源信息如表5所示。
表5
Figure PCTCN2017078184-appb-000011
步骤S401，在NB-IoT系统中，eNodeB下发PDCCH order，其中指示的PRACH信息如表6所示，包括字段“Starting number of NPRACH repetitions”和“Subcarrier indication of NPRACH”。
表6
Figure PCTCN2017078184-appb-000012
步骤S402，UE收到PDCCH order，获取初始覆盖等级信息，并获取该等级对应的PRACH资源，包括时域位置、频域位置。其中频域位置由nprach-SubcarrierOffset-r13(PRACH起始子载波)、nprach-NumSubcarriers-r13两个参数确定(PRACH载波个数)确定。
例如，获取初始覆盖等级为CEL0，并获取CEL0对应的PRACH资源，其周期为640ms，起始子帧偏移为8，子载波个数为12、范围为0-11，在CEL0上发起随机接入次数为min(3,20)＝3次。UE根据指示的Subcarrier indication of NPRACH，来计算其在CEL0上使用的子载波ID，计算方法可以但不限于：
PRACH的子载波ID＝nprach-SubcarrierOffset-r13+Subcarrier indication of NPRACH mod nprach-NumSubcarriers-r13＝0+6 mod 12＝6。
步骤S403，PDCCH order结束子帧为n，从索引为(n+9)的子帧开始，UE在确定的PRACH资源上发送PRACH。
如，UE在满足
Figure PCTCN2017078184-appb-000013
的子帧作为起始子帧发送PRACH信号，使用的子载波ID为6。这里，sf为无线帧号，ns为时隙号。如果发起的随机接入过程失败，且在CEL0上发起随机接入次数小于3，则在满足
Figure PCTCN2017078184-appb-000014
子帧作为起始子帧再次发送PRACH信号，使用的子载波ID为6。
步骤S404，判断随机接入是否成功，若是则执行步骤S406，否则执行步骤S405。
如果在CEL0上发起随机接入次数达到3次(还未达到总次数门限20次)，那么UE将覆盖等级提升至CEL1，并获取该等级对应的PRACH资源，其周期为640ms，起始子帧偏移为64，子载波个数为12、范围为12-23，在CEL1上发起随机接入次数为min(3,20-3)＝3次。
步骤S405，如果发起的随机接入过程失败，则在确定的PRACH资源上再次发送PRACH,并判断在初始覆盖等级上发送PRACH的次数是否小于最大随机接入次数，若是则执行步骤S407，否则执行步骤S406。
步骤S406，随机接入过程结束。
步骤S407，在初始覆盖等级上发送PRACH次数是否小于该覆盖等级的随机接入次数，若是指执行步骤S403，否则执行步骤S408。
步骤S408，如果在当前覆盖等级上发送PRACH次数＝ maxNumPreambleAttemptCE-r13(当前覆盖的随机接入次数)、且当前覆盖等级上发送PRACH次数<numRepetitionsPerPreambleAttempt-r13(最大随机接入次数)，则覆盖等级+1，并获取该等级对应的PRACH资源，包括时域位置、频域位置和重复次数；则将覆盖等级提高一个等级，重新执行步骤S403。
UE在新的覆盖等级上计算其使用的PRACH子载波ID。
UE在重新确定的PRACH资源上发送PRACH。
例如，UE根据指示的Subcarrier indication of NPRACH，来计算其在CEL1使用的子载波ID，计算方法可以但不限于：PRACH子载波ID＝12+6mod 12＝18，UE在满足的子帧作为起始子帧再次发送PRACH信号，使用的子载波ID为18。
重复上述步骤，直到随机接入成功，或者达到最大重复次数min(3+3+3,20)＝9。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到根据上述实施例的方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本申请各个实施例所述的方法。
实施方式3
需要说明的是，NB-IoT系统配置了三个覆盖等级，分别为CEL0、CEL1、CEL2，其中CEL0的覆盖等级最低。三个覆盖等级的PRACH资源信息如表7所示。
表7
Figure PCTCN2017078184-appb-000016
Figure PCTCN2017078184-appb-000017
步骤S401，在NB-IoT系统中，eNodeB下发PDCCH order，其中指示的PRACH信息如表8所示，包括字段“Starting number of NPRACH repetitions”和“Subcarrier indication of NPRACH”。
表8
Figure PCTCN2017078184-appb-000018
步骤S402，UE收到PDCCH order，获取初始覆盖等级信息，并获取该等级对应的PRACH资源，包括时域位置、频域位置。其中频域位置由nprach-SubcarrierOffset-r13(PRACH起始子载波)、nprach-NumSubcarriers-r13两个参数确定(PRACH载波个数)确定。
例如，获取初始覆盖等级为CEL0，并获取CEL0对应的PRACH资源，其周期为640ms，起始子帧偏移为8，子载波个数为12、范围为0-11，在CEL0上发起随机接入次数为min(3,20)＝3次。UE根据指示的Subcarrier indication of NPRACH，来计算其在CEL0上使用的子载波ID，计算方法可以但不限于：
PRACH的子载波ID＝nprach-SubcarrierOffset-r13+(Subcarrier indication of NPRACH-nprach-SubcarrierOffset-r13)mod nprach-NumSubcarriers-r13＝0+(6-0)mod 12＝6。
步骤S403，PDCCH order结束子帧为n，从索引为(n+9)的子帧开始，UE在确定的PRACH资源上发送PRACH。
如，UE在满足
Figure PCTCN2017078184-appb-000019
的子帧作为起始子帧发送PRACH 信号，使用的子载波ID为6。这里，sf为无线帧号，ns为时隙号。如果发起的随机接入过程失败，且在CEL0上发起随机接入次数小于3，则在满足
Figure PCTCN2017078184-appb-000020
子帧作为起始子帧再次发送PRACH信号，使用的子载波ID为6。
步骤S404，判断随机接入是否成功，若是则执行步骤S406，否则执行步骤S405。
如果在CEL0上发起随机接入次数达到3次(还未达到总次数门限20次)，那么UE将覆盖等级提升至CEL1，并获取该等级对应的PRACH资源，其周期为640ms，起始子帧偏移为64，子载波个数为12、范围为12-23，在CEL1上发起随机接入次数为min(3,20-3)＝3次。
步骤S405，如果发起的随机接入过程失败，则在确定的PRACH资源上再次发送PRACH,并判断在初始覆盖等级上发送PRACH的次数是否小于最大随机接入次数，若是则执行步骤S407，否则执行步骤S406。
步骤S406，随机接入过程结束。
步骤S407，在初始覆盖等级上发送PRACH次数是否小于该覆盖等级的随机接入次数，若是指执行步骤S403，否则执行步骤S408。
步骤S408，如果在当前覆盖等级上发送PRACH次数＝maxNumPreambleAttemptCE-r13(当前覆盖的随机接入次数)、且当前覆盖等级上发送PRACH次数<numRepetitionsPerPreambleAttempt-r13(最大随机接入次数)，则覆盖等级+1，并获取该等级对应的PRACH资源，包括时域位置、频域位置和重复次数；则将覆盖等级提高一个等级，重新执行步骤S403。
UE在新的覆盖等级上计算其使用的PRACH子载波ID。
UE在重新确定的PRACH资源上发送PRACH。
例如，UE根据指示的Subcarrier indication of NPRACH，来计算其在CEL1使用的子载波ID，计算方法可以但不限于：PRACH子载波ID＝12+(6-0)mod 12＝18，UE在满足
Figure PCTCN2017078184-appb-000021
的子帧作为起始 子帧再次发送PRACH信号，使用的子载波ID为18。
重复上述步骤，直到随机接入成功，或者达到最大重复次数min(3+3+3,20)＝9。
在NB-IoT Rel-14引入multi-carrier增强技术后，允许在anchor-载波和non-anchor载波上发起随机接入。每个覆盖度等级下配置可用于随机接入的PRACH载波。对于基站发起的随机接入过程，基站除了指示上述的PRACH资源信息，还会指示终端发起随机接入的PRACH载波。当终端在基站指定的初始覆盖等级上发起随机接入失败需要提升覆盖等级时，基站指示的PRACH载波在高一覆盖等级的PRACH资源组中可能并不存在，此时终端或者无法发起随机接入，或者在基站指示的PRACH资源上发送PRACH信号、但基站不会响应，结果都将导致随机接入失败，降低了基站发起的随机接入成功率，导致终端上行失步等。
可选地，目标PRACH资源还包括用于发送PRACH信号的目标载波，其中，根据资源信息从当前覆盖等级下的可用资源中映射出目标PRACH资源包括：根据当前覆盖等级下的载波列表和资源信息中的载波索引确定目标载波。
可选地，根据当前覆盖等级下的载波列表和资源信息中的载波索引确定目标载波包括：根据系统配置的非锚定载波列表和每个载波上不同覆盖等级的PRACH资源配置确定当前覆盖等级下的目标载波列表，其中，非锚定载波列表用于保存第一非锚定载波，目标载波列表中的第二非锚定载波来源于非锚定载波列表，目标载波列表中的每个载波具有一个索引；根据目标载波列表中的载波数量Num4、载波索引ID11计算第四索引ID12＝(ID11)mod(Num4)，其中，载波索引ID11为用于查找目标载波的索引；将目标载波列表中索引号为ID12的载波作为目标载波。
系统为每个非锚定载波上配置各个覆盖等级对应的PRACH资源。按照系统配置的非锚定载波列表中的顺序，依次将配置有当前覆盖等级的PRACH资源的非锚定载波按照其在非锚定载波列表中顺序组成目标载波列表。
可选地，在载波索引ID11不为预设阈值的情况下，非锚定载波列表中的每个第一非锚定载波具有一个载波序号，在目标载波列表中，位于列表队首的锚定载波的载波序号为0，第二非锚定载波的载波序号与非锚定载波列表中第二非锚定载波的来源载波的载波序号相同。
可选地，在载波索引ID11不为预设阈值的情况下，在目标载波列表中，位于列表队首的锚定载波的载波序号为0，第二非锚定载波的载波序号与第二非锚定载波的索引相同。
可选地，在载波索引ID11不为预设阈值的情况下，非锚定载波列表中的每个第一非锚定载波具有一个载波序号，在目标载波列表中，位于列表队尾的锚定载波的载波序号为0，第二非锚定载波的载波序号与非锚定载波列表中第二非锚定载波的来源载波的载波序号相同。
可选地，在载波索引ID11为预设阈值的情况下，非锚定载波列表中的每个第一非锚定载波具有一个载波序号，在目标载波列表中，第二非锚定载波的载波序号与非锚定载波列表中第二非锚定载波的来源载波的载波序号相同，其中，目标载波列表不包括锚定载波。
可选地，在载波索引ID11为预设阈值的情况下，在目标载波列表中，第二非锚定载波的载波序号与第二非锚定载波的索引相同，其中，目标载波列表不包括锚定载波。
可选地，在载波索引ID11为预设阈值的情况下，将锚定载波作为目标子载波，其中，预设阈值用于指示将锚定载波作为目标子载波。
根据当前覆盖等级下的载波列表确定目标载波包括：根据系统配置的non-anchor载波列表{non-anchor载波ID1，non-anchor载波ID2，…}和每个载波上不同覆盖等级的PRACH资源配置确定当前覆盖等级下的可用载波列表A，列表A中载波顺序依次为{anhor载波，non-anchor载波n1，non-anchor载波n2，…}，按照排序顺序依次为列表A中的载波设置索引号为0，1，2，…。anhor载波的载波ID为0，non-anchor载波n1、non-anchor载波n2，…的载波ID为系统配置的non-anchor载波列表中对应的 non-anchor载波的载波ID，其排序与系统配置的non-anchor载波列表顺序相同或者一致。根据载波列表A中的载波数量Num4、载波索引ID11计算第四索引ID12＝(ID11)mod(Num4)。将载波列表A中索引号为ID12的载波作为目标载波。
或者，根据系统配置的non-anchor载波列表{non-anchor载波ID1，non-anchor载波ID2，…}和每个载波上不同覆盖等级的PRACH资源配置确定当前覆盖等级下的可用载波列表A，列表A中载波顺序依次为{anhor载波，non-anchor载波n1，non-anchor载波n2，…}，按照排序顺序依次为列表A中的载波设置索引号为0，1，2，…。anhor载波，non-anchor载波n1、non-anchor载波n2，…的载波ID即为其索引号。non-anchor载波n1、non-anchor载波n2，…的排序与其在系统配置的non-anchor载波列表中的顺序一致。根据载波列表A中的载波数量Num4、载波索引ID11计算第四索引ID12＝(ID11)mod(Num4)。将载波列表A中索引号为ID12的载波作为目标载波。
或者，根据系统配置的non-anchor载波列表{non-anchor载波ID1，non-anchor载波ID2，…}和每个载波上不同覆盖等级的PRACH资源配置确定当前覆盖等级下的可用载波列表A，列表A中载波顺序依次为{non-anchor载波n1，non-anchor载波n2，…，anhor载波}，按照排序顺序依次为列表A中的载波设置索引号为0，1，2，…。anhor载波的载波ID为0，non-anchor载波n1、non-anchor载波n2，…的载波ID为系统配置的non-anchor载波列表中对应的non-anchor载波的载波ID，其排序与系统配置的non-anchor载波列表顺序相同或者一致。根据载波列表A中的载波数量Num4、载波索引ID11计算第四索引ID12＝(ID11)mod(Num4)。将载波列表A中索引号为ID12的载波作为目标载波。
或者，如果载波索引ID11为特定值，将anchor载波作为目标子载波；如果载波索引ID11不是特定值，根据系统配置的non-anchor载波列表{non-anchor载波ID1，non-anchor载波ID2，…}和每个载波上不同覆 盖等级的PRACH资源配置确定当前覆盖等级下的可用载波列表A，列表A中载波顺序依次为{non-anchor载波n1，non-anchor载波n2，…}，按照排序顺序依次为列表A中的载波设置索引号为0，1，2，…。non-anchor载波n1、non-anchor载波n2，…的载波ID为系统配置的non-anchor载波列表中对应的non-anchor载波的载波ID，其排序与系统配置的non-anchor载波列表顺序相同或者一致。根据载波列表A中的载波数量Num4、载波索引ID11计算第四索引ID12＝(ID11)mod(Num4)。将载波列表A中索引号为ID12的载波作为目标载波。
或者，如果载波索引ID11为特定值，将anchor载波作为目标子载波；如果载波索引ID11不是特定值，根据系统配置的non-anchor载波列表{non-anchor载波ID1，non-anchor载波ID2，…}和每个载波上不同覆盖等级的PRACH资源配置确定当前覆盖等级下的可用载波列表A，列表A中载波顺序依次为{non-anchor载波n1，non-anchor载波n2，…}，按照排序顺序依次为列表A中的载波设置索引号为0，1，2，…。non-anchor载波n1、non-anchor载波n2，…的载波ID即为其索引号。non-anchor载波n1、non-anchor载波n2，…的排序与其在系统配置的non-anchor载波列表中的顺序一致。根据载波列表A中的载波数量Num4、载波索引ID11计算第四索引ID12＝(ID11)mod(Num4)。将载波列表A中索引号为ID12的载波作为目标载波。
表9示出了NB-IoT Rel-14标准协议中的PDCCH order指示的PRACH信息。
表9
Figure PCTCN2017078184-appb-000022
在NB-IoT系统中，如果终端为Rel-13版本，则在anchor载波上发送PRACH信号，确定发送PRACH的子载波；如果终端为Rel-14版本，则终端根据基站指示的PRACH carrier Index字段确定当前覆盖等级上发送PRACH信号所使用的PRACH载波，其方式可以但不限于：
方式1：
1)确定当前覆盖上可用于发送PRACH信号的所有PRACH载波：如果有anchor载波，将anchor载波编号为0，其余non-anchor载波按照广播消息中non-anchor载波列表中的顺序从1开始依次编号；如果没有anchor载波，则将non-anchor载波按照广播消息中non-anchor载波列表中的顺序从0开始依次编号。该编号标记为index1；编号最大值+1为当前覆盖可用于发送PRACH信号的PRACH载波个数Nprach_carrier。该编号标记为index1；编号最大值为当前覆盖可用于发送PRACH信号的PRACH载波个数Nprach_carrier；
2)确定其在当前覆盖上所使用的PRACH载波index2＝index1 mod Nprach_carrier；
3)在index1中取值为index2的PRACH载波，为终端发送PRACH信号的PRACH载波。
方式2：
1)确定当前覆盖上可用于发送PRACH信号的所有PRACH载波：non-anchor载波按照广播消息中non-anchor载波列表中的顺序从0开始依次编号，编号最大值为Nnon-anchor；如果有anchor载波，将anchor载波编号为Nnon-anchor+1。该编号标记为index1；编号最大值+1为当前覆盖可用于发送PRACH信号的PRACH载波个数Nprach_carrier；
2)确定其在当前覆盖上所使用的PRACH载波index2＝index1 mod Nprach_carrier；
3)在index1中取值为index2的PRACH载波，为终端发送PRACH信号的PRACH载波。
方式3：
1)如果系统所指示的PRACH carr ier Index为某一特定值(如0或者15)，表示系统指定在anchor载波上发送PRACH信号，终端仅在anchor载波上发送PRACH信号；
2)如果系统指示的PRACH carrier Index不是特定值，那么确定当前覆盖上可用于发送PRACH信号的所有non-anchor载波：将non-anchor载波按照广播消息中non-anchor载波列表中的顺序从0开始依次编号。该编号标记为index1；编号最大值+1为当前覆盖可用于发送PRACH信号的PRACH载波个数Nprach_carrier；
3)确定其在当前覆盖上所使用的PRACH载波index2＝index1 mod Nprach_carrier；
4)在index1中取值为index2的PRACH载波，为终端发送PRACH信号的PRACH载波。
方式4：
1)如果系统所指示的PRACH carrier Index为特定值0，表示系统指定在anchor载波上发送PRACH信号，终端仅在anchor载波上发送PRACH信号；
2)如果系统指示的PRACH carrier Index不是特定值，那么确定当前覆盖上可用于发送PRACH信号的所有non-anchor载波：将anchor载波编号为0；将non-anchor载波按照广播消息中non-anchor载波列表中的顺序从1开始依次编号。该编号标记为index1；编号最大值为当前覆盖可用于发送PRACH信号的non-anhor PRACH载波个数Nprach_carrier；
3)确定其在当前覆盖上所使用的non-anchor PRACH载波index2＝1+index1 mod Nprach_carrier；
4)在index1中取值为index2的PRACH载波，为终端发送PRACH信号的PRACH载波。
一种可选的实施例如下：
NB-IoT系统配置了三个覆盖等级，分别为CEL0/CEL1/CEL2，其中CEL0的覆盖等级最低。同时NB-IoT小区中配置了1个anchor载波和3个non-anchor载波。这5个载波的PRACH资源信息如表10所示。表10示出了NB-IoT系统广播配置的PRACH信息。
表10
Figure PCTCN2017078184-appb-000023
eNodeB下发PDCCH order，其中指示的PRACH信息如表11所示。
表11
Figure PCTCN2017078184-appb-000024
Rel-14的UE收到PDCCH order，获取初始覆盖等级为CEL0，并获取CEL0对应的PRACH资源信息，表12示出了CEL0的PRACH资源信息。
表12
Figure PCTCN2017078184-appb-000025
将anchor载波编号为0；将non-anchor载波按照系统广播配置的载波理解顺序从1开始编号，non-anchor载波1编号为1，non-anchor载波2编号为2，non-anchor载波3编号为3；0-3的编号列表为index1，即index1＝[0,1,2,3]，分别对应{anchor载波，non-anchor载波1，non-anchor载波2，non-anchor载波3}。同时获知CEL0上可用的PRACH载波数为4。
UE根据指示的PRACH carrier Index来确定其在CEL0上使用的PRACH载波index2＝PRACH carrier Index mod 4＝3 mod 4＝3。
在index1中找到索引值为3对应的载波为non-anchor载波3，为UE发送PRACH信号的PRACH载波。
在non-anchor载波3上，UE根据指示的Subcarrier indication of NPRACH，来计算其在CEL0上使用的子载波ID，计算方法可以但不限于：
PRACH子载波ID＝0+6 mod 12＝6。
UE在满足
Figure PCTCN2017078184-appb-000026
的子帧作为起始子帧发送PRACH信号，在non-anchor载波3上使用的子载波ID为6。这里，sf为无线帧号，ns为时隙号。
如果发起的随机接入过程失败，且在CEL0上发起随机接入次数小于3，则在满足
Figure PCTCN2017078184-appb-000027
子帧作为起始子帧再次发送PRACH信号，在non-anchor载波3上使用的子载波ID为6。
如果在CEL0上发起随机接入次数达到3次(还未达到总次数门限20次)，那么UE将覆盖等级提升至CEL1，并获取该等级对应的PRACH资源如表13，示出了CEL1的PRACH资源信息。
表13
Figure PCTCN2017078184-appb-000028
将anchor载波编号为0；将non-anchor载波按照系统广播配置的载波理解顺序从1开始编号，non-anchor载波1编号为1，non-anchor载波2编号为2；0-2的编号列表为index1，即index1＝[0,1,2]，分别对应{anchor载波，non-anchor载波1，non-anchor载波2}。同时获知CEL1上可用的PRACH载波数为3。
UE根据指示的PRACH carrier Index来确定其在CEL1上使用的PRACH载波index2＝PRACH carrier Index mod 3＝3 mod 3＝0。
在index1中找到索引值为0对应的载波为anchor载波，为UE发送PRACH信号的PRACH载波。
在anchor载波上，UE根据指示的Subcarrier indication of NPRACH，来计算其在CEL1使用的子载波ID，计算方法可以但不限于：
PRACH子载波ID＝12+6 mod 12＝18。
UE在满足
Figure PCTCN2017078184-appb-000029
的子帧作为起始子帧再次发送PRACH信号，使用anchor载波、子载波ID为18。
重复上述步骤，直到随机接入成功，或者达到最大重复次数min(3+3+3,20)＝9。
本实施例还提供了一种可选的实施例：
NB-IoT系统配置了三个覆盖等级，分别为CEL0/CEL1/CEL2，其中CEL0的覆盖等级最低。同时NB-IoT小区中配置了1个anchor载波和3个non-anchor载波。这5个载波的PRACH资源信息如表14所示。
表14
Figure PCTCN2017078184-appb-000030
eNodeB下发PDCCH order，其中指示的PRACH信息如表15所示。表15示出了NB-IoT下发PDCCH order指示的PRACH信息。
表15
Figure PCTCN2017078184-appb-000031
Rel-14的UE收到PDCCH order，其指示的PRACH carrier Index不是特定值(假定特定值为0)，则获取初始覆盖等级为CEL0，并获取CEL0 对应的non-anchor载波的PRACH资源信息如表16所示，表16示出了CEL0的non-anchor载波的PRACH资源信息。
表16
Figure PCTCN2017078184-appb-000032
将non-anchor载波按照系统广播配置的载波理解顺序从0开始编号，non-anchor载波1编号为0，non-anchor载波2编号为1，non-anchor载波3编号为2；0-2的编号列表为index1，即index1＝[0,1,2]，分别对应{non-anchor载波1，non-anchor载波2，non-anchor载波3}。同时获知CEL0上可用的non-anchor PRACH载波数为3。
UE根据指示的PRACH carrier Index来确定其在CEL0上使用的non-anchor PRACH载波index2＝PRACH carrier Index mod 3＝3 mod 3＝0。
在index1中找到索引值为0对应的载波为non-anchor载波1，为UE发送PRACH信号的PRACH载波。
在non-anchor载波1上，UE根据指示的Subcarrier indicat ion of NPRACH，来计算其在CEL0上使用的子载波ID，计算方法可以但不限于：
PRACH子载波ID＝0+6 mod 12＝6。
UE在满足
Figure PCTCN2017078184-appb-000033
的子帧作为起始子帧发送PRACH信号，在non-anchor载波1上使用的子载波ID为6。这里，sf为无线帧号，ns为时隙号。
如果发起的随机接入过程失败，且在CEL0上发起随机接入次数小于3，则在满足
Figure PCTCN2017078184-appb-000034
子帧作为起始子帧再次发送PRACH信号，在 non-anchor载波1上使用的子载波ID为6。
如果在CEL0上发起随机接入次数达到3次(还未达到总次数门限20次)，那么UE将覆盖等级提升至CEL1，并获取该等级对应的non-anchor PRACH资源如表17所示。
表17
Figure PCTCN2017078184-appb-000035
将non-anchor载波按照系统广播配置的载波理解顺序从0开始编号，non-anchor载波1编号为0，non-anchor载波2编号为1；0-1的编号列表为index1，即index1＝[0,1]，分别对应{non-anchor载波1，non-anchor载波2}。同时获知CEL1上可用的non-anchor PRACH载波数为2。
UE根据指示的PRACH carrier Index来确定其在CEL1上使用的PRACH载波index2＝PRACH carrier Index mod 2＝3 mod 2＝1。
在index1中找到索引值为1对应的载波为non-anchor载波2，为UE发送PRACH信号的PRACH载波。
在non-anchor载波2上，UE根据指示的Subcarrier indication of NPRACH，来计算其在CEL1使用的子载波ID，计算方法可以但不限于：
PRACH子载波ID＝12+6 mod 12＝18。
UE在满足
Figure PCTCN2017078184-appb-000036
的子帧作为起始子帧再次发送PRACH信号，使用non-anchor载波2、子载波ID为18。
重复上述步骤，直到随机接入成功，或者达到最大重复次数min(3+3+3,20)＝9。
本申请还提供了一种可选的实施例：
NB-IoT系统配置了三个覆盖等级，分别为CEL0/CEL1/CEL2，其中CEL0的覆盖等级最低。同时NB-IoT小区中配置了1个anchor载波和3个non-anchor载波。这5个载波的PRACH资源信息如表18所示。表18示出了NB-IoT系统广播配置的PRACH信息。
表18
Figure PCTCN2017078184-appb-000037
eNodeB下发PDCCH order，其中指示的PRACH信息如表19所示。表19示出了NB-IoT下发PDCCH order指示的PRACH信息。
表19
Figure PCTCN2017078184-appb-000038
Rel-14的UE收到PDCCH order，其指示的PRACH carrier Index不是特定值(假定特定值为0)，则获取初始覆盖等级为CEL0，并获取CEL0对应的non-anchor载波的PRACH资源信息，表20示出了CEL0的non-anchor载波的PRACH资源信息。
表20
Figure PCTCN2017078184-appb-000039
将anchor载波编号为0；non-anchor载波按照系统广播配置的载波理解顺序从1开始编号，non-anchor载波1编号为1，non-anchor载波2编号为2，non-anchor载波3编号为3；0-3的编号列表为index1，即index1＝[0,1,2,3]，分别对应{anchor载波，non-anchor载波1，non-anchor载波2，non-anchor载波3}。同时获知CEL0上可用的non-anchor PRACH载波数为3。
UE根据指示的PRACH carrier Index来确定其在CEL0上使用的non-anchor PRACH载波index2＝1+PRACH carrier Index mod 3＝1+3 mod 3＝1。
在index1中找到索引值为1对应的载波为non-anchor载波1，为UE发送PRACH信号的PRACH载波。
在non-anchor载波1上，UE根据指示的Subcarrier indication of NPRACH，来计算其在CEL0上使用的子载波ID，计算方法可以但不限于：
PRACH子载波ID＝0+6 mod 12＝6。
UE在满足
Figure PCTCN2017078184-appb-000040
的子帧作为起始子帧发送PRACH信号，在non-anchor载波1上使用的子载波ID为6。这里，sf为无线帧号，ns为时隙号。
如果发起的随机接入过程失败，且在CEL0上发起随机接入次数小于3，则在满足(sf+ns/2)mod 640＝8子帧作为起始子帧再次发送PRACH信号，在non-anchor载波1上使用的子载波ID为6。
如果在CEL0上发起随机接入次数达到3次(还未达到总次数门限20次)，那么UE将覆盖等级提升至CEL1，并获取该等级对应的non-anchor PRACH资源，表21示出了CEL1的non-anchor载波的PRACH资源信息。
表21
Figure PCTCN2017078184-appb-000041
将non-anchor载波按照表5中系统广播配置的载波理解顺序从0开始编号，non-anchor载波1编号为0，non-anchor载波2编号为1；0-1的编号列表为index1，即index1＝[0,1]，分别对应{non-anchor载波1，non-anchor载波2}。同时获知CEL1上可用的non-anchor PRACH载波数为2。
UE根据指示的PRACH carrier Index来确定其在CEL1上使用的PRACH载波index2＝PRACH carrier Index mod 2＝3 mod 2＝1。
在index1中找到索引值为1对应的载波为non-anchor载波2，为UE发送PRACH信号的PRACH载波。
在non-anchor载波2上，UE根据指示的Subcarrier indication of NPRACH，来计算其在CEL1使用的子载波ID，计算方法可以但不限于：
PRACH子载波ID＝12+6 mod 12＝18
UE在满足
Figure PCTCN2017078184-appb-000042
的子帧作为起始子帧再次发送PRACH信号，使用non-anchor载波2、子载波ID为18。
重复上述步骤，直到随机接入成功，或者达到最大重复次数min(3+3+3,20)＝9。
本申请还提供了一个可选的实施例：
NB-IoT系统配置了三个覆盖等级，分别为CEL0/CEL1/CEL2，其中CEL0 的覆盖等级最低。同时NB-IoT小区中配置了1个anchor载波和3个non-anchor载波。这5个载波的PRACH资源信息如表22所示。表22示出了NB-IoT系统广播配置的PRACH信息。
表22
Figure PCTCN2017078184-appb-000043
eNodeB下发PDCCH order，其中指示的PRACH信息如表23所示。
表23
Figure PCTCN2017078184-appb-000044
Rel-14的UE收到PDCCH order，其指示的PRACH carrier Index是特定值0(假定特定值为0)，则获取初始覆盖等级为CEL0，并获取CEL0对应的anchor载波的PRACH资源信息如表24所示，表24示出了CEL0的anchor载波的PRACH资源信息。
表24
Figure PCTCN2017078184-appb-000045
在anchor载波上，UE根据指示的Subcarrier indication of NPRACH，来计算其在CEL0上使用的子载波ID，计算方法可以但不限于：
PRACH子载波ID＝0+6 mod 12＝6。
UE在满足
Figure PCTCN2017078184-appb-000046
的子帧作为起始子帧发送PRACH信号，在anchor载波上使用的子载波ID为6。这里，sf为无线帧号，ns为时隙号。
如果发起的随机接入过程失败，且在CEL0上发起随机接入次数小于3，则在满足
Figure PCTCN2017078184-appb-000047
子帧作为起始子帧再次发送PRACH信号，在anchor载波上使用的子载波ID为6。
如果在CEL0上发起随机接入次数达到3次(还未达到总次数门限20次)，那么UE将覆盖等级提升至CEL1，并获取该等级对应的anchor PRACH资源如表25所示。
表25
Figure PCTCN2017078184-appb-000048
在anchor载波上，UE根据指示的Subcarrier indication of NPRACH，来计算其在CEL1使用的子载波ID，计算方法可以但不限于：
PRACH子载波ID＝12+6 mod 12＝18。
UE在满足
Figure PCTCN2017078184-appb-000049
的子帧作为起始子帧再次发送PRACH信号，使用anchor载波、子载波ID为18。
重复上述步骤，直到随机接入成功，或者达到最大重复次数min(3+3+3,20)＝9。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到根 据上述实施例的方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本申请各个实施例所述的方法。
实施例2
本申请中还提供了一种无线通信系统中的随机接入装置。该装置用于实现上述实施例及优选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图5是根据本申请的无线通信系统中的随机接入装置的示意图。如图5所示，该装置可以包括：接收单元51、确定单元52以及发送单元53。
接收单元51用于接收移动基站发送的指示信息，其中，指示信息用于指示用户终端发起随机接入。
确定单元52用于基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，其中，目标PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入，当前覆盖等级为当前要发起随机接入的覆盖等级。
发送单元53用于当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH资源，并在重新确定的目标PRACH资源上发送PRACH信号
通过上述实施例，接收单元接收移动基站发送的指示信息，指示信息用于指示用户终端发起随机接入；确定单元基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，目标PRACH资源用 于发送PRACH信号，PRACH信号用于发起随机接入；发送单元当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH资源，并在重新确定的目标PRACH资源上发送PRACH信号，从而解决了相关技术中移动基站发起的随机接入成功率较低的技术问题，实现了提高随机接入成功率的技术效果。
在接收单元接收移动基站发送的指示信息时，可以是接收为PDCCHorder信息的指示信息。
在确定单元基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源时，可根据资源信息从当前覆盖等级下的可用资源中映射出目标PRACH资源。具体可以根据与移动基站的系统类型对应的方式来确定目标PRACH资源。
在无线通信系统为eMTC系统的情况下，目标PRACH资源包括用于发送PRACH信号的目标时频域资源和目标码字，确定单元包括：第二确定模块，用于根据当前覆盖等级下的可用时频域资源的资源数量和资源信息中的时频资源索引确定目标时频域资源；第三确定模块，用于根据当前覆盖等级下的前导码的起始码字、结束码字及资源信息中的前导码索引确定目标码字。
可选地，第二确定模块还用于使用预设公式，根据可用时频域资源的资源数量Num1和资源信息中的时频资源索引ID1计算第一索引ID2，其中，预设公式为ID2＝(ID1-K1)mod(Num1)+K2，或，ID2＝(ID1)mod(Num1)+K3，K1、K2、K3为常数；将与ID2对应的时频资源作为目标时频域资源。
第三确定模块还用于根据起始码字的索引ID3、结束码字的索引ID4及前导码索引ID5计算第二索引ID6＝ID3+(ID5)mod(ID4-ID3+1)，或者，根据起始码字的索引ID3、结束码字的索引ID4及前导码索引ID5、指示信息指示的覆盖等级对应的起始码字索引ID9来计算第二索引ID6＝ID3+(ID5-ID9)mod(ID4-ID3+1)；将与ID6对应的码字作为目标码字。
在无线通信系统为NB-IoT系统的情况下，目标PRACH资源包括用于 发送PRACH信号目标子载波，确定单元包括：第四确定模块，用于根据当前覆盖等级下的子载波数量、起始子载波的索引及资源信息中的子载所以或波偏移确定目标子载波。
可选地，第四确定模块还用于根据当前覆盖等级下的子载波数量Num2、起始子载波的索引ID7及资源信息中的子载波偏移Num3计算第三索引ID8＝ID7+(Num3)mod(Num2)，或者，根据当前覆盖等级下的子载波数量Num2、起始子载波的索引ID7及资源信息中的子载波索引Num3、指示信息中指示的覆盖等级对应的起始在载波索引ID10计算第三索引ID8＝ID7+(Num3-ID10)mod(Num2)；；将与ID8对应的子载波作为目标子载波。
上述的发送单元包括：获取模块，用于获取发起随机接入的失败次数；第一确定模块，用于在失败次数达到预设值的情况下，确定在目标PRACH资源上发起的随机接入失败，其中，预设值为在当前覆盖等级下，允许发送PRACH信号的次数最大值。
可选地，发送单元还包括：发送模块，用于在获取发起随机接入的失败次数之后，在失败次数小于预设值的情况下，在目标PRACH资源上重新发送PRACH信号。
需要说明的是，更新后的覆盖等级比更新前的覆盖等级高一个等级。
需要说明的是，上述各个模块是可以通过软件或硬件来实现的，对于后者，可以通过以下方式实现，但不限于此：上述模块均位于同一处理器中；或者，上述各个模块以任意组合的形式分别位于不同的处理器中。
实施例3
本申请的实施例还提供了一种存储介质。可选地，在本实施例中，上述存储介质可以被设置为存储用于执行以下步骤的程序代码：
S1，接收移动基站发送的指示信息，其中，指示信息用于指示用户终端发起随机接入；
S2，基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，其中，目标PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入；
S3，当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH资源，并在重新确定的目标PRACH资源上发送PRACH信号。
可选地，在本实施例中，上述存储介质可以包括但不限于：U盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、移动硬盘、磁碟或者光盘等各种可以存储程序代码的介质。
可选地，在本实施例中，处理器根据存储介质中已存储的程序代码执行:接收移动基站发送的指示信息，其中，指示信息用于指示用户终端发起随机接入；基于当前覆盖等级和指示信息中携带的资源信息从可用资源中确定目标PRACH资源，其中，目标PRACH资源用于发送PRACH信号，PRACH信号用于发起随机接入；当在目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和资源信息从可用资源中重新确定目标PRACH资源，并在重新确定的目标PRACH资源上发送PRACH信号。
可选地，本实施例中的具体示例可以参考上述实施例及可选实施方式中所描述的示例，本实施例在此不再赘述。
显然，本领域的技术人员应该明白，上述的本申请的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本申请不限制于任何特定的硬件和软件结合。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于 本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (33)

  1. 一种无线通信系统中的随机接入方法，包括：
    接收移动基站发送的指示信息，其中，所述指示信息用于指示用户终端发起随机接入；
    基于当前覆盖等级和所述指示信息中携带的资源信息从可用资源中确定目标PRACH资源，其中，所述目标PRACH资源用于发送PRACH信号，所述PRACH信号用于发起随机接入，当前覆盖等级为当前要发起随机接入的覆盖等级，可用资源为当前覆盖等级下允许被使用的资源；
    当在所述目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和所述资源信息从可用资源中重新确定所述目标PRACH资源，并在重新确定的所述目标PRACH资源上发送所述PRACH信号。
  2. 根据权利要求1所述的方法，其中，通过如下方式确定在所述目标PRACH资源上发起的随机接入失败：
    获取发起随机接入的失败次数；
    在所述失败次数达到预设值的情况下，确定在所述目标PRACH资源上发起的随机接入失败，其中，所述预设值为在当前覆盖等级下，允许发送所述PRACH信号的次数最大值。
  3. 根据权利要求2所述的方法，其中，所述方法还包括：
    在获取发起随机接入的失败次数之后，在所述失败次数小于所述预设值的情况下，在所述目标PRACH资源上重新发送所述PRACH信号。
  4. 根据权利要求1所述的方法，其中，更新后的覆盖等级比更新前的覆盖等级高一个等级。
  5. 根据权利要求1至4中任意一项所述的方法，其中，基于当 前覆盖等级和所述指示信息中携带的资源信息从可用资源中确定目标PRACH资源包括：
    根据所述资源信息从当前覆盖等级下的可用资源中映射出所述目标PRACH资源。
  6. 根据权利要求5所述的方法，其中，在无线通信系统为eMTC系统的情况下，所述目标PRACH资源包括用于发送所述PRACH信号的目标时频域资源和目标码字，根据所述资源信息从当前覆盖等级下的可用资源中映射出所述目标PRACH资源包括：
    根据当前覆盖等级下的可用时频域资源的资源数量和所述资源信息中的时频资源索引确定所述目标时频域资源；和/或，
    根据当前覆盖等级下的前导码的起始码字、结束码字及所述资源信息中的前导码索引确定所述目标码字。
  7. 根据权利要求6所述的方法，其中，根据当前覆盖等级下的可用时频域资源的资源数量和所述资源信息中的时频资源索引确定所述目标时频域资源包括：
    使用预设公式，根据所述可用时频域资源的资源数量Num1和所述资源信息中的时频资源索引ID1计算第一索引ID2，其中，所述预设公式为ID2＝(ID1-K1)mod(Num1)+K2，或，ID2＝(ID1)mod(Num1)+K3，K1、K2、K3为常数；
    将与ID2对应的时频资源作为所述目标时频域资源。
  8. 根据权利要求6所述的方法，其中，根据当前覆盖等级下的前导码的起始码字、结束码字及所述资源信息中的前导码索引确定所述目标码字包括：
    根据所述起始码字的索引ID3、所述结束码字的索引ID4及所述前导码索引ID5计算第二索引ID6＝ID3+(ID5)mod(ID4-ID3+1)，或者， 根据所述起始码字的索引ID3、所述结束码字的索引ID4及所述前导码索引ID5、指示信息指示的覆盖等级对应的起始码字索引ID9来计算第二索引ID6＝ID3+(ID5-ID9)mod(ID4-ID3+1)；
    将与ID6对应的码字作为所述目标码字。
  9. 根据权利要求5所述的方法，其中，在无线通信系统为NB-IoT系统的情况下，所述目标PRACH资源包括用于发送所述PRACH信号的目标子载波，根据所述资源信息从当前覆盖等级下的可用资源中映射出所述目标PRACH资源包括：
    根据当前覆盖等级下的子载波数量、起始子载波的索引及所述资源信息中的子载波索引或者偏移确定所述目标子载波。
  10. 根据权利要求9所述的方法，其中，根据当前覆盖等级下的子载波和所述资源信息中的子载波索引或者偏移确定所述目标子载波包括：
    根据当前覆盖等级下的子载波数量Num2、起始子载波的索引ID7及所述资源信息中的子载波偏移Num3计算第三索引ID8＝ID7+(Num3)mod(Num2)，或者，根据当前覆盖等级下的子载波数量Num2、起始子载波的索引ID7及所述资源信息中的子载波索引Num3、指示信息中指示的覆盖等级对应的起始在载波索引ID10计算第三索引ID8＝ID7+(Num3-ID10)mod(Num2)；
    将与ID8对应的子载波作为所述目标子载波。
  11. 根据权利要求1所述的方法，其中，所述指示信息为PDCCHorder信息。
  12. 根据权利要求6所述的方法，其中，所述指示信息为切换信息。
  13. 根据权利要求9所述的方法，其中，所述目标PRACH资源还 包括用于发送所述PRACH信号的目标载波，其中，根据所述资源信息从当前覆盖等级下的可用资源中映射出所述目标PRACH资源包括：
    根据当前覆盖等级下的载波列表和所述资源信息中的载波索引确定所述目标载波，其中，所述目标载波包括所述目标子载波。
  14. 根据权利要求13所述的方法，其中，根据当前覆盖等级下的载波列表和所述资源信息中的载波索引确定所述目标载波包括：
    根据系统配置的非锚定载波列表和每个载波上不同覆盖等级的PRACH资源配置确定当前覆盖等级下的目标载波列表，其中，所述非锚定载波列表用于保存第一非锚定载波，所述目标载波列表中的第二非锚定载波来源于所述非锚定载波列表，所述目标载波列表中的每个载波具有一个索引；
    根据所述目标载波列表中的载波数量Num4、载波索引ID11计算第四索引ID12＝(ID11)mod(Num4)，其中，载波索引ID11为用于查找所述目标载波的索引；
    将所述目标载波列表中索引号为ID12的载波作为所述目标载波。
  15. 根据权利要求14所述的方法，其中，在所述载波索引ID11不为预设阈值的情况下，所述非锚定载波列表中的每个所述第一非锚定载波具有一个载波序号，在所述目标载波列表中，位于列表队首的锚定载波的载波序号为0，所述第二非锚定载波的载波序号与所述非锚定载波列表中所述第二非锚定载波的来源载波的载波序号相同。
  16. 根据权利要求14所述的方法，其中，在所述载波索引ID11不为预设阈值的情况下，在所述目标载波列表中，位于列表队首的锚定载波的载波序号为0，所述第二非锚定载波的载波序号与所述第二非锚定载波的索引相同。
  17. 根据权利要求14所述的方法，其中，在所述载波索引ID11 不为预设阈值的情况下，所述非锚定载波列表中的每个所述第一非锚定载波具有一个载波序号，在所述目标载波列表中，位于列表队尾的锚定载波的载波序号为0，所述第二非锚定载波的载波序号与所述非锚定载波列表中所述第二非锚定载波的来源载波的载波序号相同。
  18. 根据权利要求14所述的方法，其中，在所述载波索引ID11为预设阈值的情况下，所述非锚定载波列表中的每个所述第一非锚定载波具有一个载波序号，在所述目标载波列表中，所述第二非锚定载波的载波序号与所述非锚定载波列表中所述第二非锚定载波的来源载波的载波序号相同，其中，所述目标载波列表不包括锚定载波。
  19. 根据权利要求14所述的方法，其中，在所述载波索引ID11为预设阈值的情况下，在所述目标载波列表中，所述第二非锚定载波的载波序号与所述第二非锚定载波的索引相同，其中，所述目标载波列表不包括锚定载波。
  20. 根据权利要求14所述的方法，其中，在所述载波索引ID11为预设阈值的情况下，将锚定载波作为所述目标载波，其中，所述预设阈值用于指示将所述锚定载波作为所述目标载波。
  21. 一种无线通信系统中的随机接入装置，包括：
    接收单元，设置为接收移动基站发送的指示信息，其中，所述指示信息用于指示用户终端发起随机接入；
    确定单元，设置为基于当前覆盖等级和所述指示信息中携带的资源信息从可用资源中确定目标PRACH资源，其中，所述目标PRACH资源用于发送PRACH信号，所述PRACH信号用于发起随机接入，当前覆盖等级为当前要发起随机接入的覆盖等级；
    发送单元，设置为当在所述目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和所述资源信息从可用资源中重新 确定所述目标PRACH资源，并在重新确定的所述目标PRACH资源上发送所述PRACH信号。
  22. 根据权利要求21所述的装置，其中，所述发送单元包括：
    获取模块，设置为获取发起随机接入的失败次数；
    第一确定模块，设置为在所述失败次数达到预设值的情况下，确定在所述目标PRACH资源上发起的随机接入失败，其中，所述预设值为在当前覆盖等级下，允许发送所述PRACH信号的次数最大值。
  23. 根据权利要求22所述的装置，其中，所述发送单元还包括：
    发送模块，设置为在获取发起随机接入的失败次数之后，在所述失败次数小于所述预设值的情况下，在所述目标PRACH资源上重新发送所述PRACH信号。
  24. 根据权利要求21所述的装置，其中，更新后的覆盖等级比更新前的覆盖等级高一个等级。
  25. 根据权利要求21至23中任意一项所述的装置，其中，所述确定单元还设置为根据所述资源信息从当前覆盖等级下的可用资源中映射出所述目标PRACH资源。
  26. 根据权利要求25所述的装置，其中，在无线通信系统为eMTC系统的情况下，所述目标PRACH资源包括用于发送所述PRACH信号的目标时频域资源和目标码字，所述确定单元包括：
    第二确定模块，设置为根据当前覆盖等级下的可用时频域资源的资源数量和所述资源信息中的时频资源索引确定所述目标时频域资源；
    第三确定模块，设置为根据当前覆盖等级下的前导码的起始码字、结束码字及所述资源信息中的前导码索引确定所述目标码字。
  27. 根据权利要求26所述的装置，其中，所述第二确定模块还 设置为：
    使用预设公式，根据所述可用时频域资源的资源数量Num1和所述资源信息中的时频资源索引ID1计算第一索引ID2，其中，所述预设公式为ID2＝(ID1-K1)mod(Num1)+K2，或，ID2＝(ID1)mod(Num1)+K3，K1、K2、K3为常数；
    将与ID2对应的时频资源作为所述目标时频域资源。
  28. 根据权利要求26所述的装置，其中，所述第三确定模块还设置为:
    根据所述起始码字的索引ID3、所述结束码字的索引ID4及所述前导码索引ID5计算第二索引ID6＝ID3+(ID5)mod(ID4-ID3+1)，或者，根据所述起始码字的索引ID3、所述结束码字的索引ID4及所述前导码索引ID5、指示信息指示的覆盖等级对应的起始码字索引ID9来计算第二索引ID6＝ID3+(ID5-ID9)mod(ID4-ID3+1)；
    将与ID6对应的码字作为所述目标码字。
  29. 根据权利要求25所述的装置，其中，在无线通信系统为NB-IoT系统的情况下，所述目标PRACH资源包括用于发送所述PRACH信号目标子载波，所述确定单元包括：
    第四确定模块，设置为根据当前覆盖等级下的子载波数量、起始子载波的索引及所述资源信息中的子载波索引或者偏移确定所述目标子载波。
  30. 根据权利要求29所述的装置，其中，所述第四确定模块还设置为：
    根据当前覆盖等级下的子载波数量Num2、起始子载波的索引ID7及所述资源信息中的子载波偏移Num3计算第三索引ID8＝ID7+(Num3)mod(Num2)，或者，根据当前覆盖等级下的子载波数量 Num2、起始子载波的索引ID7及所述资源信息中的子载波索引Num3、指示信息中指示的覆盖等级对应的起始在载波索引ID10计算第三索引ID8＝ID7+(Num3-ID10)mod(Num2)；
    将与ID8对应的子载波作为所述目标子载波。
  31. 根据权利要求21所述的装置，其中，所述指示信息为PDCCHorder信息。
  32. 根据权利要求26所述的装置，其中，所述指示信息为切换信息。
  33. 一种用户终端，包括：
    存储器，所述存储器中存储有包括如下步骤的代码：接收移动基站发送的指示信息，其中，所述指示信息用于指示用户终端发起随机接入；基于当前覆盖等级和所述指示信息中携带的资源信息从可用资源中确定目标PRACH资源，其中，所述目标PRACH资源用于发送PRACH信号，所述PRACH信号用于发起随机接入，可用资源为当前覆盖等级下允许被使用的资源；当在所述目标PRACH资源上发起随机接入失败的情况下，基于更新后的覆盖等级和所述资源信息从可用资源中重新确定所述目标PRACH资源，并在重新确定的所述目标PRACH资源上发送所述PRACH信号；
    处理器，所述处理器用于执行所述存储器中存储的代码；
    传输装置，分别与所述存储器和所述处理器连接，用于将所述存储器中的代码传输至所述处理器。
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