WO2018171376A1 - 一种随机接入回退后的随机接入及指示方法、装置 - Google Patents

一种随机接入回退后的随机接入及指示方法、装置 Download PDF

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Publication number
WO2018171376A1
WO2018171376A1 PCT/CN2018/077051 CN2018077051W WO2018171376A1 WO 2018171376 A1 WO2018171376 A1 WO 2018171376A1 CN 2018077051 W CN2018077051 W CN 2018077051W WO 2018171376 A1 WO2018171376 A1 WO 2018171376A1
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Prior art keywords
terminal
random access
indication
backoff
base station
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PCT/CN2018/077051
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English (en)
French (fr)
Inventor
谌丽
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电信科学技术研究院有限公司
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Priority to JP2019552489A priority Critical patent/JP6823197B2/ja
Priority to US16/496,926 priority patent/US11363645B2/en
Priority to EP18771368.0A priority patent/EP3606266B8/en
Priority to KR1020197031344A priority patent/KR102261171B1/ko
Publication of WO2018171376A1 publication Critical patent/WO2018171376A1/zh

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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
    • H04W74/0833—Random access procedures, e.g. with 4-step 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
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/008—Transmission of channel access control information with additional processing of random access related information at receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a random access and indication method and apparatus after random access rollback.
  • LTE Long Term Evolution
  • Radio resource control (RRC) connection reestablishment is used for the following purposes: initial access of the terminal, radio resource control (RRC) connection reestablishment, handover, downlink data arrival in the RRC connected state in the non-synchronized state, uplink data arrival in the RRC connected state, RRC Positioning when connected.
  • RRC radio resource control
  • Figure 1 is a schematic diagram of a competitive random access procedure, as shown in Figure 1, which is mainly divided into four steps:
  • a user equipment (User Equipment, UE, also called a terminal) selects a random access preamble and a physical random access channel (PRACH) resource, and uses the PRACH resource to send the selected random to the base station. Access the preamble.
  • UE User Equipment
  • PRACH physical random access channel
  • the base station receives the random access preamble, calculates the timing advance TA (Time Alignment), and sends a random access response to the UE.
  • the random access response includes the timing advance information and the uplink for Msg3.
  • the scheduling information (UL grant) and the Cell-Radio Network Temporary Identifier (C-RNTI) allocated by the network side.
  • the physical downlink control channel (PDCCH) carrying the Msg2 scheduling message is scrambled by a random access-Radio Network Temporary (RA-RNTI), and the RA-RNTI is transmitted and transmitted in a 10 ms window.
  • RA-RNTI random access-Radio Network Temporary
  • the time-frequency resource of Msg1 uniquely corresponds; in addition, the Msg2 further carries a random access preamble ID, and the UE determines, by the RA-RNTI and the random access preamble ID, that the Msg2 corresponds to the Msg1 sent by the UE.
  • the UE sends an uplink transmission on the uplink grant information (UL grant) specified by the Msg2.
  • the content of the Msg3 uplink transmission is different for different random access reasons. For example, for the initial access, the Msg3 transmits an RRC connection setup request.
  • Msg4 The contention resolution message, the UE can judge whether the random access is successful according to Msg4. For the initial access UE, after the contention resolution is successful, the temporary C-RNTI is automatically converted into the C-RNTI of the UE for uniquely identifying the UE in the cell.
  • Non-contention random access is used for handover, downlink data arrival, location, and acquisition of uplink timing.
  • FIG. 2 is a schematic diagram of a non-contention random access process, as shown in FIG. 2, which is mainly divided into three steps:
  • the base station allocates a dedicated random access preamble for non-contention random access and a PRACH resource used for random access to the UE.
  • Msg1 The UE sends the specified dedicated random access preamble to the base station on the designated PRACH resource according to the indication of Msg0. After receiving the Msg1, the base station calculates the uplink timing advance TA according to Msg1.
  • the base station sends a random access response to the UE.
  • the random access response includes timing advance information and subsequent uplink transmission resource allocation uplink scheduling information (UL grant), and the timing advance is used for the timing relationship of the UE subsequent uplink transmission.
  • UL grant uplink transmission resource allocation uplink scheduling information
  • the base station After the terminal sends the Msg1, if the base station receives the random access request Msg1 sent by the terminal and cannot access the terminal (for example, because the number of random access requests is too large, there are not enough resources, etc.), the base station carries the random access response.
  • Backoff Indicator BI
  • the backoff indication in LTE is carried in the Media Access Control (MAC) subheader.
  • FIG 3 is a schematic diagram of the E/T/R/R/BI MAC subheader structure, as shown in Figure 3, where "E” It is used to indicate whether the next MAC sub-header is a MAC sub-header carrying a random access preamble ID or a random access response (RAR), and “T” is used to indicate whether the sub-header is followed by a BI value or a random access preamble. Code ID, "R” is the reserved bit, and "BI” is used to indicate the backoff time parameter.
  • the terminal uses the uniform distribution algorithm to take a time value between the values indicated by the 0-BI domain according to the value indicated by the BI, and retransmits the Msg1 at this moment, that is, initiates a new random access.
  • the base station When the random access load of the cell is large, the base station indicates a large backoff value, delaying the time when the terminal re-initiates the random access; when the cell random access load is small, the base station indicates a small backoff value, and the random access fails.
  • the terminal can initiate a new random access attempt soon.
  • the shortcoming of the prior art is that the current random access fallback mechanism cannot adapt to the current diversified user requirements, and the user may not be able to access the network quickly, resulting in blocking of subsequent service data transmission.
  • the embodiment of the invention provides a random access and indication method and device after the random access rollback, which is used to solve the problem that the current random access fallback mechanism cannot meet the current diversified user requirements.
  • the embodiment of the present invention provides a random access method after a random access rollback, including: sending a random access request Msg1 to a base station; receiving a random access backoff indication sent by the base station, the random connection
  • the inbound and outbound indications are used to indicate that different types of terminals apply different fallback parameters, and re-initiate random access after random access failure; and initiate random access according to the random access fallback indication.
  • the default backoff parameter is 0 in the random access fallback indication
  • random access is initiated on the latest resource; wherein, in the random access back indication, the default for the specific terminal
  • the rollback parameter is 0, and the specific terminal is a low-latency user type terminal or a low-latency service type terminal.
  • the base station when the random access request Msg1 is sent to the base station, the base station sends a random access request Msg1 on the corresponding random access resource according to the terminal type on different random access resources allocated by the base station for different types of terminals. .
  • the BI parameter in the preset random access fallback indication of the base station corresponds to different time values under different types of terminals, according to the terminal type. After determining the time value corresponding to the BI parameter in the random access fallback indication, the random access is initiated according to the time value.
  • the multiple BI values indicated in the backoff indication of the random access response are determined according to user requirements and/or terminal types of the terminal.
  • the BI value initiates random access.
  • the random access fallback indication is performed by carrying the terminal type indication and the BI corresponding to the terminal type in the MAC subheader.
  • a parameter indicating the BI value of the terminal is carried by carrying the terminal type indication and the BI corresponding to the terminal type in the MAC subheader.
  • the terminal is classified according to one of the following content or a combination thereof: a terminal type, a quality of service class indicator (QCI) requirement, a QCI requirement of the terminal service, and a terminal of the terminal.
  • a terminal type a quality of service class indicator (QCI) requirement
  • QCI requirement of the terminal service a QCI requirement of the terminal service
  • a terminal of the terminal a terminal of the terminal.
  • Network, the network to which the terminal service belongs, the RAN side slice slice to which the terminal belongs, the RAN side slice slice to which the terminal service belongs, and/or, when the terminal has multiple services, the service requirement for triggering random access is taken as The current terminal needs and classifies the terminals accordingly.
  • the method further includes: receiving a threshold of a backoff value indicated by the base station to the terminal, and when the terminal is smaller than the threshold of the backoff value, using a uniform distribution algorithm to calculate a time for re-random access, when the threshold is greater than the threshold of the backoff value Using a non-uniform distribution algorithm to calculate a time when the random access is re-executed; or, receiving an access factor indicated by the base station to the terminal, and correcting the BI value according to the access factor, where the access factor indicated by the base station is in the terminal delay requirement The higher the terminal access probability indicated by the access factor, the higher.
  • the embodiment of the present invention provides a random access fallback indication method, including: receiving, by a base station, a random access request Msg1 sent by a terminal; and sending a random access backoff indication, indicating that different types of terminal applications have different fallbacks
  • the parameter re-initiates random access after the random access fails.
  • a default backoff parameter for a specific terminal is 0, and the specific terminal is a low latency user type terminal or a low latency service type terminal.
  • the random access fallback indication is allocated according to the random access resource that receives the random access request, and the terminal is allocated a different random access resource for different types of terminals in advance. .
  • the BI parameters in the random access fallback indication correspond to different time values under different types of terminals.
  • the base station indicates, in the backoff indication of the random access response, a plurality of BI values to perform a random access fallback indication, where the BI value is determined according to a user requirement of the terminal and/or a terminal type.
  • the random access fallback indication is performed by carrying the terminal type indication and the BI corresponding to the terminal type in the MAC subheader.
  • a parameter indicating the BI value of the terminal is carried by carrying the terminal type indication and the BI corresponding to the terminal type in the MAC subheader.
  • the base station before sending the random access fallback indication, further includes: classifying the terminal, and applying different backoff parameters to the terminal of different types, including: classifying the terminal according to one or a combination of the following: The terminal type, the QCI requirement of the terminal user service, the QCI requirement of the terminal service, the network to which the terminal belongs, the network to which the terminal service belongs, the RAN side slice slice to which the terminal belongs, and the RAN side slice slice to which the terminal service belongs; Or, when the terminal has multiple services, the service request that triggers the random access is used as the current terminal requirement, and the terminal is classified according to the same.
  • the base station selects a BI value corresponding to the terminal type, and further includes: to the terminal by indicating a BI value to perform a random access fallback indication in the backoff indication of the random access response
  • the threshold value of the back-off value is indicated, and when the terminal is smaller than the threshold of the back-off value, the uniform distribution algorithm is used to calculate the time when the random access is re-established, and when the threshold is greater than the threshold of the back-off value, the non-uniform distribution algorithm is used to calculate the random access again.
  • the access factor is indicated to the terminal, and the higher the terminal delay requirement, the greater the terminal access probability indicated by the access factor.
  • the embodiment of the present invention provides a random access device after a random access rollback, including: a sending module, configured to send a random access request Msg1 to a base station; and a receiving module, configured to receive a random An access back indication is used to indicate that different types of terminals apply different fallback parameters, and the random access is re-initiated after the random access fails; the sending module is further configured to use the random access according to the random access The fallback indication initiates random access.
  • the sending module is further configured to: when the default backoff parameter is 0 in the random access fallback indication, initiate random access on the latest resource; wherein, in the random access back indication, The default backoff parameter for a specific terminal is 0, and the specific terminal is a low-latency user type terminal or a low-latency service type terminal.
  • the sending module is further configured to: when sending the random access request Msg1 to the base station, send the different random access resources allocated by the base station to different types of terminals in advance, and send the corresponding random access resources according to the terminal type. Random access request Msg1.
  • the sending module is further configured to: when the random access is initiated according to the random access fallback indication, the BI parameter in the base station preset random access fallback indication corresponds to different time values under different types of terminals. After the time value corresponding to the BI parameter in the random access fallback indication is determined according to the terminal type, random access is initiated according to the time value.
  • the sending module is further configured to: when the random access is initiated according to the random access fallback indication, is a plurality of BI values indicated in the backoff indication of the random access response, according to user requirements of the terminal / or the BI value determined by the terminal type initiates random access.
  • the sending module is further configured to: when the base station indicates the multiple access value by using the multiple BI values in the backoff indication of the random access response, by using the terminal type indication and the The BI parameter corresponding to the terminal type indicates the BI value of the terminal.
  • the terminal is classified according to one of the following content or a combination thereof: a terminal type, a QCI requirement of the terminal user service, a QCI requirement of the terminal service, a network to which the terminal belongs, a network to which the terminal service belongs, and the terminal The RAN side slice slice to which the terminal service belongs, and the RAN side slice slice to which the terminal service belongs; and/or, when the terminal has multiple services, the service request that triggers the random access is used as the current terminal requirement and the terminal is classified according to the current terminal requirement.
  • the receiving module is further configured to receive a threshold of a backoff value indicated by the base station to the terminal, where the sending module is further configured to use a uniform distribution algorithm to calculate a time for re-random random access when the threshold is less than the threshold value, The non-uniform distribution algorithm is used to calculate the time when the random access is re-executed; or the receiving module is further configured to receive the access factor indicated by the base station to the terminal; and the sending module is further configured to perform the BI value according to the access factor.
  • the correction is that the access factor indicated by the base station is greater when the terminal delay requirement is higher, and the terminal access probability indicated by the access factor is larger.
  • the embodiment of the present invention provides a random access back indication device, including: a request receiving module, configured to receive a random access request Msg1 sent by the terminal, and an indication module, configured to send a random access back indication Indicates that different types of terminals apply different fallback parameters, and re-initiate random access after random access failure.
  • the indicating module is further configured to: in the random access fallback indication, a default backoff parameter for the specific terminal is 0, and the specific terminal is a low latency user type terminal or a low latency service type terminal.
  • the random access fallback indication is allocated according to the random access resource that receives the random access request for the terminal of the corresponding type and the requirement, where different random access resources are allocated in advance for different types of terminals.
  • the BI parameters in the random access fallback indication correspond to different time values under different types of terminals.
  • the indication module is further configured to indicate, in the backoff indication of the random access response, a plurality of BI values to perform a random access fallback indication, where the BI value is determined according to a user requirement of the terminal and/or a terminal type.
  • the indication module is further configured to: when the random access back indication is indicated by indicating multiple BI values in the backoff indication of the random access response, by using the terminal type indication and the terminal in the MAC subheader
  • the BI parameter corresponding to the type indicates the BI value of the terminal.
  • the indicating module is further configured to: before the sending the random access fallback indication, further: classifying the terminal, and applying different backoff parameters to the terminal of different types, including: according to one of the following content or a combination thereof
  • the terminal classifies: the terminal type, the QCI requirement of the terminal user service, the QCI requirement of the terminal service, the network to which the terminal belongs, the network to which the terminal service belongs, the RAN side slice slice to which the terminal belongs, and the RAN side slice to which the terminal service belongs. Slice; and/or, when the terminal has multiple services, the service demand that triggers the random access is used as the current terminal requirement and the terminal is classified accordingly.
  • the indication module is further configured to: after determining the terminal type, select a BI value corresponding to the terminal type, and when the BI value is used to perform a random access fallback indication in the backoff indication of the random access response,
  • the method further includes: indicating a threshold of the backoff value to the terminal, and when the terminal is smaller than the threshold of the backoff value, using a uniform distribution algorithm to calculate a time for re-performing random access, and when the threshold is greater than the threshold of the back-off value, calculating by using a non-uniform distribution algorithm The time at which the random access is performed; or the access factor is indicated to the terminal, and the higher the terminal delay requirement, the greater the terminal access probability indicated by the access factor.
  • a terminal in a fifth aspect, includes: a processor, a transceiver, and a memory; the transceiver is configured to receive and transmit data under control of the processor, the processor is configured to read The program in the memory performs the method of any of the above first aspects.
  • a base station comprising: a processor, a transceiver, and a memory; the transceiver, configured to receive and transmit data under control of the processor, the processor, configured to read The program in the memory performs the method of any of the above second aspects.
  • a seventh aspect a computer readable storage medium storing computer executable instructions for causing the computer to perform any of the first aspect described above Methods.
  • a computer readable storage medium storing computer executable instructions for causing the computer to perform any of the second aspect described above Methods.
  • the base station when determining that the random access fallback indication is sent, may indicate that different types of terminals apply different fallback parameters, and re-initiate random access after the random access fails;
  • the random access is initiated according to the type of the user and/or the random access fallback indication sent by the base station. Because the user needs such as the terminal type are taken into consideration in the process of rolling back and initiating the random access, the current random access back can be overcome.
  • the retreat mechanism cannot meet the problem of the current diversified user requirements. Further, it can solve the problem that the user cannot quickly access the network and cause subsequent service data transmission to be blocked.
  • FIG. 1 is a schematic diagram of a contention random access procedure in the background art
  • FIG. 2 is a schematic diagram of a non-contention random access procedure in the background art
  • FIG. 3 is a schematic structural diagram of an E/T/R/R/BI MAC subheader in the background art
  • FIG. 4 is a schematic flowchart of a method for implementing a base station side random access fallback indication method according to an embodiment of the present invention
  • FIG. 5 is a schematic flowchart of a method for implementing a random access method after a terminal access random access is rolled back according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of a MAC subheader 1 indicating multiple BI values in an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a MAC subheader 2 indicating multiple BI values in an embodiment of the present invention
  • FIG. 8 is a schematic structural diagram of a random access device after a random access rollback on a terminal side according to an embodiment of the present disclosure
  • FIG. 9 is a schematic structural diagram of a base station side random access back indication device according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • the current random access fallback mechanism is the same for all terminals.
  • NR next generation radio
  • URLLC Ultra Reliable & Low Latency Communication
  • a technical solution for how to address diverse terminal and service requirements in the NR system is provided. After the random access fails, the subsequent random access process can be effectively initiated. It not only ensures the low-latency demand terminal fast access, but also makes the random access resource utilization average, reduces the random access collision probability, and thus maximizes the random access success rate.
  • FIG. 4 is a schematic flowchart of a method for implementing a random access back-off indication method on a base station side, as shown in the figure, which may include:
  • Step 401 The base station receives a random access request sent by the terminal, where the random access request is an Msg1 message.
  • Step 402 The base station sends a random access fallback indication, where the random access fallback indication is used to indicate that different types of terminals apply different fallback parameters, and re-initiate random access after the random access fails.
  • FIG. 5 is a schematic flowchart of a method for implementing a random access method after a random access rollback on a terminal side, as shown in the figure, which may include:
  • Step 501 The terminal sends a random access request to the base station, where the random access request is an Msg1 message.
  • Step 502 The terminal receives a random access fallback indication sent by the base station, where the random access fallback indication is used to indicate that different types of terminals apply different fallback parameters, and re-initiate random access after the random access fails.
  • Step 503 The terminal initiates random access according to the random access backoff indication.
  • the base station before sending the random access fallback indication, may further include: classifying the terminal, and applying different backoff parameters to different types of terminals.
  • the classifying the terminal may include: classifying the terminal according to one or a combination of the following: a terminal type, a QCI requirement of the terminal user service, a QCI requirement of the terminal service, a network to which the terminal belongs, and a service to which the terminal service belongs.
  • the terminal classifies.
  • the terminal is classified, so that different types of terminals can apply different fallback parameters, including one or a combination of the following methods:
  • Manner 1 Different classifications are performed for the terminal, and different types of terminals apply different fallback parameters, and the classification is based on one or a combination of the following: the terminal type, the terminal or the QCI requirement of the terminal service, and the terminal. Or the network or RAN side slice to which the terminal service belongs.
  • the classification is based on: a terminal type, such as an Enhanced Machine Type Communications (eMTC) type terminal or a URLLC type terminal, and/or a QCI requirement of the terminal or the terminal service, and/or the terminal or the The network to which the terminal service belongs or the RAN (Radio Access Network) side slice slice.
  • a terminal type such as an Enhanced Machine Type Communications (eMTC) type terminal or a URLLC type terminal
  • eMTC Enhanced Machine Type Communications
  • URLLC URLLC
  • QCI requirement of the terminal or the terminal service and/or the terminal or the The network to which the terminal service belongs or the RAN (Radio Access Network) side slice slice.
  • a low latency terminal or a terminal with low latency services can be defined as a higher priority.
  • the terminal determines the rollback parameters of the application according to the service requirements for triggering the random access. For example, when the terminal has the URLLC service, the backoff parameter with the minimum delay is used. Large delay backoff parameter.
  • the following describes the manner in which the base station side indicates and/or the terminal side initiates new random access again.
  • the base station side in the random access fallback indication, the default backoff parameter for the specific terminal is set to 0, and the specific terminal is a low latency user type terminal or a low latency service type terminal.
  • the terminal side when the default backoff parameter is 0 in the random access fallback indication, and the terminal is a low delay user type terminal or a low delay service type terminal, random access is initiated on the latest resource.
  • Another method may be adopted, that is, for a low-latency user, a user with a high delay requirement may ignore the backoff indicator after the random access failure, and immediately re-initiate the randomization on the latest resource.
  • An access attempt ie sending Msg1.
  • the BI MAC subheader at this time can be seen in Figure 3.
  • the terminal may ignore the backoff indication by itself, and may also adopt a method of initiating random access on the latest resource when the default backoff parameter is 0 in the random access backoff indication.
  • the base station side receives a random access request (Msg1) sent by the terminal in the cell, and sends a backoff indication in the random access response (Msg2) according to the terminal density, the collision probability, and the random access resource usage, indicating that the random access fails.
  • Msg1 a random access request
  • Msg2 a backoff indication in the random access response
  • the time parameter of the next time the terminal initiates a random access attempt for example, indicating that the default backoff parameter is 0.
  • Terminal side The terminal determines its own terminal type. If the delay requirement is very strict, the terminal that requires very low access delay can ignore the fallback parameter and determine the next random access attempt immediately after the random access failure. Or, when determining that the default backoff parameter is 0 in the random access fallback indication, the random access is initiated on the latest resource; otherwise, if the terminal with the delay requirement is not strict, the random access fails. Then, the BI parameter sent by the base station side is used to calculate the time of the next random access attempt and initiate random access.
  • the base station allocates different random access resources to different types of terminals, and the base station allocates a backoff indication to the terminal of the corresponding type and the demand according to the random access resource that receives the random access request.
  • the random access fallback indication is allocated according to the random access resource that receives the random access request for the terminal of the corresponding type and the requirement, wherein the base station allocates different random access resources for different types of terminals in advance.
  • the base station determines the RA-RNTI according to the received time-frequency position of the PRACH resource, and uses the RA-RNTI to schedule and send a random access response in the random access response window, where the random access response carries the user requirement for the terminal.
  • the BI indicates that the PRACH resource time-frequency location is allocated by the base station to different types of terminals in advance.
  • the base station When the random access request (Msg1) is sent to the base station, the base station sends a random access request (Msg1) on the corresponding random access resource according to the terminal type on different random access resources allocated by the base station for different types of terminals. .
  • the corresponding PRACH resource time-frequency location is determined according to the user requirement of the terminal, and the Msg1 is sent at the location, and the random access response is received by the RA-RNTI in the random access response window, according to the random access response.
  • the carried BI indication initiates random access.
  • the base station configures different random access time-frequency resources (PRACH resources) for users with different delay requirements, and the base station determines the RA-RNTI according to the received PRACH resource time-frequency position, and schedules the back-off indication BI by using the base station.
  • the random access response only the terminal that has sent Msg1 on the time-frequency resource follows the backoff indication.
  • the network side can determine the terminal delay requirement according to the location of the PRACH resource, and indicate a reasonable backoff time length parameter.
  • the terminal with different delay requirements is a random access request (Msg1) sent on different PRACH resources, and can determine where the RA-RNTI receives the random access response and receives the corresponding BI.
  • Msg1 random access request
  • the random access time-frequency resources of terminals with different requirements are completely separated.
  • the BI MAC subheader at this time can refer to FIG. 3.
  • different demanding terminals configure different random access resources (time-frequency resources) to receive different BI values.
  • Step 1 Allocating two or more sets of random access resources, each set of random access resources has non-overlapping time-frequency resource locations, and each set of time-frequency resources corresponds to one type of terminal.
  • Step 2 The base station receives the random access request (Msg1) on the configured random access time-frequency resource, determines the terminal type according to the random access time-frequency resource location, and determines the terminal requirement, as long as it is a delay requirement.
  • Step 3 If the base station cannot access the terminal, the base station generates a random access response window according to the time-frequency resource of the random access request (Msg1), and calculates the RA-RNTI according to the time-frequency resource position, in a random manner.
  • a random access response is sent by the RA-RNTI scheduling in the access response window, and the random access response carries a BI indication for the terminal or the terminal.
  • Step 1 The terminal receives the random access resource configuration sent by the base station side, and satisfies different terminal types corresponding to the random access resources.
  • Step 2 The terminal selects the nearest random access time-frequency resource from the corresponding random access resource group to send a random access request according to its own type and service requirement.
  • Step 3 The terminal determines the random access response window according to the time-frequency resource for sending the random access request (Msg1), calculates the RA-RNTI used for receiving the random access response, and receives the random RA-RNTI in the random access response window.
  • the access response if the random access response carries the BI indication, uses the BI indication to calculate the time to re-initiate the random access attempt after the random access fails, and initiates a new random access attempt.
  • the base station sends a backoff indication to the terminal.
  • the BI indication field has different mapping tables, and the same BI parameters are mapped to different time values for different terminals.
  • the BI parameters in the random access fallback indication correspond to different time values under different types of terminals.
  • the base station performs a random access fallback indication by using a backoff delay parameter value in the BI value, and the value of the backoff delay parameter has a mapping relationship with different types of terminals.
  • the BI parameter in the preset random access fallback indication of the base station corresponds to different time values under different types of terminals, and the random is determined according to the terminal type. After accessing the time value corresponding to the BI parameter in the backoff indication, random access is initiated according to the time value.
  • the value of the backoff delay parameter in the BI value is calculated according to the mapping relationship between the terminal type and the value of the backoff delay parameter, and random access is initiated according to the time determined by the value of the backoff delay parameter.
  • the base station indicates a BI value, and the terminals with different requirements map them to different backoff delay parameter values.
  • BI a BI value
  • the traditional LTE indicates 10ms
  • the NR can be expressed as a shorter value for the low latency terminal. , such as 1ms.
  • the base station side receives a random access request (Msg1) sent by the terminal in the cell, and sends a backoff indication in the Msg2 random access response according to the terminal density, the collision probability, and the random access resource usage, and indicates the terminal that fails the random access.
  • Msg1 a random access request
  • the time parameter for the next random access attempt The time parameter for the next random access attempt.
  • the base station does not need to know the terminal type.
  • the base station indicates, in the backoff indication of the random access response, a plurality of BI values to perform a random access fallback indication, where the BI value is determined according to user requirements and/or terminal types of the terminal.
  • the terminal is classified, so that different types of terminals can apply different fallback parameters, including: performing different classifications for the terminal, and different types of (category) terminals applying different fallback parameters, and classifying the basis.
  • different types of terminals including: performing different classifications for the terminal, and different types of (category) terminals applying different fallback parameters, and classifying the basis.
  • a terminal type a QCI requirement of the terminal or the terminal service, a network or a RAN side slice to which the terminal or the terminal service belongs; and/or when the terminal has multiple services
  • the service requirement that triggers the random access is used as the current terminal requirement, and the terminal type is defined accordingly, and the application's fallback parameter is determined.
  • the base station indicates, in the backoff indication of the random access response, a plurality of BI values to perform a random access fallback indication, where the BI value is determined according to user requirements and/or terminal types of the terminal.
  • the BI value determined according to the user requirement of the terminal and/or the terminal type is initiated. Random access.
  • the base station when the base station indicates, by using a backoff indication of the random access response, a plurality of BI values to perform a random access fallback indication, the base station type indication and the BI parameter corresponding to the terminal type are carried in the MAC subheader. , indicating the BI value of the terminal.
  • the terminal priority indication of the terminal and the BI parameter corresponding to the priority of the terminal may also be carried in the MAC subheader.
  • the base station indicates a plurality of BI values in the backoff indication of the random access response, and specifies a terminal type corresponding to the BI value.
  • the BI MAC subheader needs to be modified to indicate multiple BI values.
  • FIG. 6 is a schematic diagram of the MAC subheader 1 indicating multiple BI values
  • FIG. 7 is a schematic diagram of the MAC subheader 2 indicating multiple BI values.
  • the MAC subheader indicating multiple BI values may be as shown in FIG. 6 or FIG. 7.
  • P indicates the corresponding terminal type or terminal priority, “BI1” and “BI2”.
  • "" is a fallback indication for different types of terminals.
  • the random access response carries multiple BI values for different demanding terminals.
  • the BI MAC subheader can be referred to FIG. 6 or FIG. 7.
  • the base station side receives a random access request (Msg1) sent by the terminal in the cell, and sends a backoff indication in the random access response (Msg2) according to the terminal density, the collision probability, and the random access resource usage, indicating that the terminals of different types are randomly
  • Msg1 a random access request
  • Msg2 a backoff indication in the random access response
  • the BI MAC sub-header carries the terminal type priority indication and the BI parameter corresponding to each priority.
  • the BI parameters corresponding to the different terminal types are mapped to the actual delay parameters.
  • the values can be the same or different.
  • the base station indicates a plurality of BI values to perform a random access fallback indication in the backoff indication of the random access response
  • the BI parameter corresponding to the priority indicates the BI value of the terminal.
  • Terminal side The terminal determines its own terminal type, reads the corresponding BI domain according to the terminal type and its priority, and maps the vehicle rollback delay parameter value. After the random access fails, the terminal calculates the time to re-initiate the random access attempt according to the obtained backoff delay parameter, and initiates a new random access attempt. That is, when the BI value of the terminal is determined according to the correspondence between the user requirement of the terminal and the BI value, and the random access is initiated according to the BI value, the priority indication according to the user requirement of the terminal carried in the MAC sub-header is The BI parameter corresponding to the priority determines the BI value of the terminal.
  • the base station selects a BI value corresponding to the terminal type, and may further include: instructing the terminal to return to the terminal by indicating the BI value to perform the random access fallback indication in the backoff indication of the random access response.
  • a threshold for the re-entry when the terminal is smaller than the threshold of the back-off value, the uniform distribution algorithm is used to calculate the time when the random access is re-established, and when the threshold is greater than the threshold of the back-off value, the non-uniform distribution algorithm is used to calculate the time for re-random access; Or, the access factor is indicated to the terminal, and the higher the terminal delay requirement, the greater the terminal access probability indicated by the access factor.
  • the method further includes: receiving a threshold of a backoff value indicated by the base station to the terminal, and when the terminal is smaller than the threshold of the backoff value, using a uniform distribution algorithm to calculate a time when the random access is re-established, and when the threshold is greater than the threshold of the backoff value, using a non-
  • the uniform distribution algorithm calculates the time when the random access is re-executed; or, receives the access factor indicated by the base station to the terminal, and corrects the BI value according to the access factor, wherein the access factor indicated by the base station is higher in the terminal delay requirement The terminal access probability indicated by the access factor is larger.
  • the random access resources are not uniformly used, and the random access request (Msg1) collision probability is increased.
  • Msg1 random access request
  • two BIs are indicated, one corresponding to T1 and one corresponding to T2, where T1 ⁇ T2, assuming that a low-latency terminal and an ordinary terminal simultaneously receive the back-off indication at the moment and both randomly fail to access.
  • the probability of initiating Msg1 is 1/T1+1/T2 at any time in the 0-T1 time period after the random access failure, and the probability of initiating Msg1 at any time in the T1-T2 time period. Is 1/T2.
  • the backoff value indicated by different BI lengths uses different algorithms to select the time to resend Msg1. For example, if a backoff value threshold Th is set and the corresponding backoff value T ⁇ Th of BI is used, the random distribution is used to re-randomize. At the time of access, when T>Th, a non-uniform distribution algorithm is adopted, so that the probability of selection in the previous part of the time period is lower than the probability of selection in the latter part of the time period.
  • Manner 2 The access factor F is introduced to modify the backoff parameter.
  • the access factor of the low-latency user is large. If the time delay is low, the user with less delay requirement has a smaller access factor in the previous part. The probability of initiating random access in the first half is low. If there are no multiple BI values, the access factor is 1.
  • the base station selects a BI value corresponding to the user requirement, and further includes, by indicating a BI value in the backoff indication of the random access response, to perform a random access fallback indication, further including
  • the base station indicates the threshold of the backoff value to the terminal.
  • the terminal uses a uniform distribution algorithm to calculate the time for re-random access, and when the BI parameter of the terminal is greater than the threshold of the back-off value, the non-uniform distribution algorithm is used for calculation. The moment of random access.
  • the method further includes: the terminal receiving the threshold of the backoff value indicated by the base station to the terminal, where the BI parameter of the terminal is less than the When the threshold value is returned, the uniform distribution algorithm is used to calculate the time when the random access is re-established. When the BI parameter of the terminal is greater than the threshold of the back-off value, the non-uniform distribution algorithm is used to calculate the time for re-random access.
  • Step 1 The terminal receives the threshold BITh of the back-off indication algorithm, and the threshold may be carried in the system message or may be carried in the random access response;
  • Step 2 The terminal initiates a random access procedure. If a BI parameter is received, the corresponding backoff delay parameter is calculated and stored.
  • Step 3 After the random access fails, the terminal compares the received BI parameter with the threshold BITh. If it is less than the threshold, the terminal may use the uniform distribution to calculate the next random access attempt time. If it is greater than the threshold, the terminal adopts The non-uniform algorithm makes the probability of selecting a time point close to the current random access failure time lower than the probability of selecting a time point far from the current random access failure time.
  • the base station after determining, by the base station, the user requirement of the terminal, the base station selects a BI parameter value corresponding to the user requirement, and further performs a random access fallback indication by indicating a BI value in the backoff indication of the random access response.
  • the method includes: the base station indicates an access factor to the terminal, and the lower the delay required by the user demand of the terminal is, the larger the access factor is.
  • the method further includes: the terminal receiving the access factor indicated by the base station to the terminal, and the BI parameter value of the terminal according to the access factor. Make corrections.
  • Step 1 The terminal initiates a random access procedure. If a random access response carrying multiple BI domains is received, the BI domain valid for the terminal is determined according to the terminal classification, and the fallback delay corresponding to the BI domain is determined according to the mapping rule. Parameter value
  • Step 2 After the random access fails, if the terminal type applies a backoff delay parameter with a small value, the uniform random allocation attempt time can be used to calculate the next random access attempt time. For a large backoff delay parameter, a non-uniform algorithm is adopted, so that the probability of selecting a time point close to the current random access failure time is lower than the probability of selecting a time point far from the current random access failure time.
  • the embodiment of the present invention further provides a base station side device, a user equipment, and a long-term evolution multi-carrier upgrade system in a long-term evolution multi-carrier upgrade system, and the principle of solving the problem and the long-term evolution multi-carrier
  • the methods for dynamically allocating uplink control channel reserved resources in the upgrade system are similar. Therefore, the implementation of these devices can be referred to the implementation of the method, and the repeated description is not repeated.
  • FIG. 8 is a schematic structural diagram of a random access device after random access rollback on the terminal side, as shown in the figure, which may include:
  • the sending module 801 is configured to send a random access request Msg1 to the base station;
  • the receiving module 802 is configured to receive a random access fallback indication sent by the base station, where the random access backoff indication is used to indicate that different types of terminals apply different fallback parameters, and re-initiate random access after the random access fails;
  • the sending module 801 is further configured to initiate random access according to the random access backoff indication.
  • the sending module is further configured to: when the default backoff parameter is 0 in the random access fallback indication, initiate random access on the latest resource; wherein, in the random access back indication, The default backoff parameter of a specific terminal is 0, and the specific terminal is a low-latency user type terminal or a low-latency service type terminal.
  • the sending module is further configured to: when the random access request Msg1 is sent to the base station, send the random access to the corresponding random access resource according to the terminal type on the different random access resources allocated by the base station in advance for different types of terminals. Access request Msg1.
  • the sending module is further configured to: when the random access is initiated according to the random access fallback indication, the BI parameter in the preset random access fallback indication of the base station corresponds to different time values under different types of terminals. After determining the time value corresponding to the BI parameter in the random access fallback indication according to the terminal type, the random access is initiated according to the time value.
  • the sending module is further configured to: when the random access is initiated according to the random access fallback indication, is a plurality of BI values indicated in the backoff indication of the random access response, according to user requirements of the terminal and/or Or the BI value determined by the terminal type initiates random access.
  • the sending module is further configured to: when the base station indicates, by using the back-off indication of the random access response, the multiple access, to perform the random access fallback indication, by using the terminal type indication and the terminal in the MAC sub-header
  • the BI parameter corresponding to the type indicates the BI value of the terminal.
  • the terminal is classified according to one of the following contents or a combination thereof: a terminal type, a QCI requirement of the terminal user service, a QCI requirement of the terminal service, a network to which the terminal belongs, a network to which the terminal service belongs, and a terminal to which the terminal belongs.
  • the RAN side slice slice, the RAN side slice slice to which the terminal service belongs, and/or, when the terminal has multiple services, the service request that triggers the random access is used as the current terminal requirement and the terminal is classified accordingly.
  • the receiving module is further configured to receive a threshold of a backoff value indicated by the base station to the terminal, where the sending module is further configured to calculate, by using a uniform distribution algorithm, a time for re-random random access when the threshold is less than the threshold value, When the threshold value is backed off, the non-uniform distribution algorithm is used to calculate the time when the random access is re-established.
  • the receiving module is further configured to receive an access factor that is indicated by the base station to the terminal; the sending module is further configured to modify the BI value according to the access factor, where the access factor indicated by the base station is higher when the terminal delay requirement is higher. The terminal access probability indicated by the access factor is larger.
  • FIG. 9 is a schematic structural diagram of a base station side random access back indication device, as shown in the figure, which may include:
  • the request receiving module 901 is configured to receive a random access request Msg1 sent by the terminal;
  • the indication module 902 is configured to send a random access fallback indication, indicating that different types of terminals apply different fallback parameters, and re-initiate random access after the random access fails.
  • the indication module is further configured to: in the random access fallback indication, a default backoff parameter for a specific terminal is 0, and the specific terminal is a low latency user type terminal or a low latency service type terminal.
  • the random access fallback indication is allocated according to the random access resource that receives the random access request, and the terminal of the corresponding type and the requirement is allocated, wherein different random access resources are allocated in advance for different types of terminals.
  • the BI parameters in the random access fallback indication correspond to different time values under different types of terminals.
  • the indication module is further configured to indicate, in the backoff indication of the random access response, a plurality of BI values to perform a random access fallback indication, where the BI value is determined according to a user requirement of the terminal and/or a terminal type.
  • the indication module is further configured to: when the random access back indication is indicated by indicating multiple BI values in the backoff indication of the random access response, by carrying the terminal type indication and the terminal type in the MAC subheader The corresponding BI parameter indicates the BI value of the terminal.
  • the indication module is further configured to: before the sending the random access fallback indication, further: classifying the terminal, and applying different backoff parameters to the terminal of different types, including: using the terminal according to one of the following contents or a combination thereof Classification: terminal type, QCI requirement of the end user service, QCI requirement of the terminal service, the network to which the terminal belongs, the network to which the terminal service belongs, the RAN side slice slice to which the terminal belongs, and the RAN side slice slice to which the terminal service belongs And/or, when the terminal has multiple services, the service demand that triggers the random access is taken as the current terminal requirement and the terminal is classified accordingly.
  • the indication module is further configured to: after determining the terminal type, select a BI value corresponding to the terminal type, and further perform a random access fallback indication by indicating a BI value in the backoff indication of the random access response.
  • the method includes: indicating a threshold of a backoff value to the terminal, and using a uniform distribution algorithm to calculate a time for re-performing random access when the terminal is smaller than the threshold of the back-off value, and performing a non-uniform distribution algorithm to calculate re-run when the threshold is greater than the threshold of the back-off value
  • the time of random access; or, the access factor is indicated to the terminal, and the higher the terminal delay requirement, the greater the terminal access probability indicated by the access factor.
  • FIG. 10 is a schematic structural diagram of a base station, as shown in the figure, the base station includes:
  • the processor 1000 is configured to read a program in the memory 1020 and perform the following process:
  • the transceiver 1010 is configured to receive and transmit data under the control of the processor 1000, and performs the following processes:
  • the default backoff parameter for a specific terminal is 0, and the specific terminal is a low delay user type terminal or a low delay service type terminal.
  • the random access fallback indication is allocated according to the random access resource that receives the random access request, and the terminal allocates different random access resources to different types of terminals in advance.
  • the BI parameters in the random access fallback indication correspond to different time values under different types of terminals.
  • the base station indicates, in the backoff indication of the random access response, a plurality of BI values to perform a random access fallback indication, where the BI value is determined according to user requirements and/or terminal types of the terminal.
  • the base station when the base station indicates, by using a backoff indication of the random access response, a plurality of BI values to perform a random access fallback indication, the base station type indication and the BI parameter corresponding to the terminal type are carried in the MAC subheader. , indicating the BI value of the terminal.
  • the method before the base station sends the random access fallback indication, the method further includes: classifying the terminal, and applying different backoff parameters to the terminal of different types, including: classifying the terminal according to one or a combination of the following: the terminal Type, QCI requirement of the end user service, QCI requirement of the terminal service, the network to which the terminal belongs, the network to which the terminal service belongs, the RAN side slice slice to which the terminal belongs, the RAN side slice slice to which the terminal service belongs, and/or
  • the service request that triggers the random access is used as the current terminal requirement, and the terminal is classified according to the same.
  • the base station determines the terminal type, selecting a BI value corresponding to the terminal type, and performing a random access fallback indication by indicating a BI value in the backoff indication of the random access response, further includes: indicating to the terminal The threshold of the back-off value, when the terminal is smaller than the threshold of the back-off value, the uniform distribution algorithm is used to calculate the time for re-random access, and when the threshold is greater than the threshold of the back-off value, the non-uniform distribution algorithm is used to calculate the time for re-random access.
  • the access factor is indicated to the terminal, and the higher the terminal delay requirement, the greater the terminal access probability indicated by the access factor.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1000 and various circuits of memory represented by memory 1020.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • Bus interface 1030 provides an interface.
  • the transceiver 1010 can be a plurality of components, including a transmitter and a transceiver, providing means for communicating with various other devices on a transmission medium.
  • the processor 1000 is responsible for managing the bus architecture and general processing, and the memory 1020 can store data used by the processor 1000 in performing operations.
  • the terminal includes: a processor 1100, configured to read a program in the memory 1120, and perform the following processes: performing data processing according to a transceiver requirement; and the transceiver 1110 is configured to be in the processor.
  • the random access when the default backoff parameter is 0 in the random access fallback indication, the random access is initiated on the latest resource; wherein, in the random access back indication, the default back to the specific terminal The retreat parameter is 0, and the specific terminal is a low-latency user type terminal or a low-latency service type terminal.
  • the random access request Msg1 when the random access request Msg1 is sent to the base station, the random access request Msg1 is sent on the corresponding random access resource according to the terminal type on the different random access resources allocated by the base station in advance for different types of terminals.
  • the BI parameter in the preset random access fallback indication of the base station is different according to different terminal values of different types of terminals, and is determined according to the terminal type. After the time value corresponding to the BI parameter in the random access back indication, the random access is initiated according to the time value.
  • the multiple BI values indicated in the backoff indication of the random access response are determined according to user requirements and/or terminal types of the terminal.
  • the BI value initiates random access.
  • the base station when the base station indicates, by using a backoff indication of the random access response, a plurality of BI values to perform a random access fallback indication, the base station type indication and the BI parameter corresponding to the terminal type are carried in the MAC subheader. , indicating the BI value of the terminal.
  • the terminal is classified according to one of the following contents or a combination thereof: a terminal type, a QCI requirement of the terminal user service, a QCI requirement of the terminal service, a network to which the terminal belongs, a network to which the terminal service belongs, and a terminal to which the terminal belongs.
  • the RAN side slice slice, the RAN side slice slice to which the terminal service belongs, and/or, when the terminal has multiple services, the service request that triggers the random access is used as the current terminal requirement and the terminal is classified accordingly.
  • the implementation further includes: receiving a threshold of a backoff value indicated by the base station to the terminal, and when the terminal is smaller than the threshold of the backoff value, using a uniform distribution algorithm to calculate a time for re-performing random access, when the threshold is greater than the threshold of the backoff value,
  • the non-uniform distribution algorithm calculates the time when the random access is re-executed; or, receives the access factor indicated by the base station to the terminal, and corrects the BI value according to the access factor, wherein the access factor indicated by the base station is more demanded in the terminal delay
  • the terminal access probability indicated by the access factor is higher when the time is high.
  • the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1100 and various circuits of memory represented by memory 1120.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • Bus interface 1140 provides an interface.
  • the transceiver 1110 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium.
  • the user interface 1130 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 can store data used by the processor 1100 in performing operations.
  • the user with high latency is required to default back to 0 in the random access fallback indication; or, after the random access fails, ignore the backoff indicator and immediately re-initiate on the most recent resource. Random access attempt.
  • the base station configures different random access time-frequency resources (PRACH resources) for users with different delay requirements, and the base station determines the RA-RNTI according to the received PRACH resource time-frequency position, and schedules the random access including the back-off indication BI.
  • PRACH resources random access time-frequency resources
  • the network side can determine the terminal delay requirement according to the location of the PRACH resource, and indicate a reasonable backoff time length parameter.
  • the terminal with different delay requirements is the random access request Msg1 sent on different PRACH resources, and can determine where the RA-RNTI receives the random access response and receives the corresponding BI. This method requires that the random access time-frequency resources of terminals of different requirements are completely separated.
  • the base station indicates a BI value, and the terminals with different requirements map it to different backoff delay parameter values.
  • the base station indicates a plurality of BI values in the backoff indication of the random access response, and specifies a terminal type corresponding to the BI value.
  • the terminal determines the rollback parameters of the application according to the service requirements for triggering the random access. For example, when the terminal has the URLLC service, the backoff parameter with the minimum delay is used. Large delay backoff parameter.
  • a scheme for homogenizing random access resource delays in multiple sets of BI parameters is further provided.
  • the subsequent random access process can be effectively initiated, which not only ensures fast access of the terminal with low delay, but also averages random access resources and reduces random access. Enter the probability of collision to maximize the random access success rate.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

本发明公开了一种随机接入回退后的随机接入及指示方法、装置，包括：基站接收终端发送的随机接入请求Msg1；发送随机接入回退指示，指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入。终端接收基站发送的随机接入回退指示，所述随机接入回退指示用以指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入；根据所述随机接入回退指示发起随机接入。采用本发明，能够克服当前的随机接入回退机制不能适应当前多样化的用户需求的问题，进一步的，能够解决用户不能快速接入网络，导致后续业务数据传输阻塞的问题。

Description

一种随机接入回退后的随机接入及指示方法、装置
本申请要求在2017年3月24日提交中国专利局、申请号为201710184460.8、发明名称为“一种随机接入回退后的随机接入及指示方法、装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无线通信技术领域，特别涉及一种随机接入回退后的随机接入及指示方法、装置。
背景技术
长期演进(Long Term Evolution，LTE)***的随机接入分为竞争随机接入和非竞争随机接入两种。
竞争随机接入用于以下目的：终端初始接入，无线资源控制(Radio Resource Control，RRC)连接重建，切换，非同步状态下RRC连接态时下行数据到达，RRC连接态时上行数据到达，RRC连接态时的定位。
图1为竞争随机接入过程示意图，如图1所示，主要分为四步：
Msg1：用户设备(User Equipment，UE，也称终端)选择随机接入前导码(preamble)和物理随机接入信道(Physical Random Access Channel，PRACH)资源并利用该PRACH资源向基站发送所选的随机接入前导码。
Msg2：基站接收到随机接入前导码，计算定时提前量TA(Time Alignment，时间对准)，并向UE发送随机接入响应，随机接入响应中包含该定时提前量信息和针对Msg3的上行调度信息(UL grant)，以及网络侧分配的小区无线网络临时标识(Cell-Radio Network Temporary Identifier，C-RNTI)。承载Msg2调度消息的物理下行控制信道(physical downlink control channel，PDCCH)用随机接入-无线网络临时标识(Random Access-Radio Network Temporary，RA-RNTI)加扰，RA-RNTI在10ms窗内与发送Msg1的时频资源唯一对应；另外Msg2中还携带随机接入前导码ID，UE通过RA-RNTI和随机接入前导码ID确定该Msg2是与其发送的Msg1对应的。
Msg3：UE在Msg2指定的上行调度信息(UL grant)上发送上行传输，不同的随机接入原因，Msg3上行传输的内容不同，比如对于初始接入，Msg3传输的是RRC连接建立请求。
Msg4：竞争解决消息，UE根据Msg4可以判断随机接入是否成功。对于初始接入UE，竞争解决成功后临时C-RNTI自动转化为UE在该小区的用于唯一标识UE的C-RNTI。
非竞争随机接入用于切换、下行数据到达、定位和获取上行定时。图2为非竞争随机接入过程示意图，如图2所示，主要分为三步：
Msg0：基站向UE分配用于非竞争随机接入的专用随机接入前导码以及随机接入使用的PRACH资源。
Msg1：UE根据Msg0的指示，在指定的PRACH资源上向基站发送指定的专用随机接入前导码。基站接收到Msg1后根据Msg1计算上行定时提前量TA。
Msg2：基站向UE发送随机接入响应，随机接入响应中包含定时提前量信息、后续上行传输资源分配上行调度信息(UL grant)，定时提前量用于UE后续上行传输的定时关系。
终端发送Msg1后，如果基站接收到终端发送的随机接入请求Msg1，不能接入该终端(例如由于随机接入请求用户数太多，没有足够资源等原因)，则在随机接入响应中携带回退指示(Backoff Indicator，BI)。LTE中回退指示携带在媒体接入控制(Media Access Control，MAC)子头中，图3为E/T/R/R/BI MAC子头结构示意图，如图3所示，其中“E”用于指示下一个MAC子头是携带随机接入前导码ID的MAC子头还是随机接入响应(Random Access Response，RAR)，“T”用于指示本子头后续是BI值还是随机接入前导码ID，“R”是预留比特，“BI”用于指示回退时间参数。终端根据BI指示的数值，采用均匀分布算法在0～BI域指示的数值之间取一个时刻值，在该时刻重新发送Msg1，即发起新的随机接入。当小区随机接入负荷大时，基站指示较大的回退值，延迟终端重新发起随机接入的时间；当小区随机接入负荷小时，基站指示较小的回退值，随机接入失败的终端可以很快发起新的随机接入尝试。
现有技术的不足在于，当前的随机接入回退机制不能适应当前多样化的用户需求，可能导致该用户不能快速接入网络，导致后续业务数据传输阻塞。
发明内容
本发明实施例提供了一种随机接入回退后的随机接入及指示方法、装置，用以解决当前的随机接入回退机制不能适应当前多样化的用户需求的问题。
第一方面，本发明实施例提供了一种随机接入回退后的随机接入方法，包括：向基站发送随机接入请求Msg1；接收基站发送的随机接入回退指示，所述随机接入回退指示用以指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入；根据所述随机接入回退指示发起随机接入。
可选地，在所述随机接入回退指示中默认回退参数为0时，在最近的资源上发起随机接入；其中，在所述随机接入回退指示中，对特定终端的默认回退参数为0，特定终端为低时延用户类型终端或低时延业务类型终端。
可选地，在向基站发送随机接入请求Msg1时，是在基站预先为不同类型的终端分配的不同随机接入资源上，根据终端类型在相应的随机接入资源上发送随机接入请求Msg1。
可选地，在根据所述随机接入回退指示发起随机接入时，是在基站预设随机接入回退指示中的BI参数在不同类型终端下对应不同的时间值下，根据终端类型确定所述随机接入回退指示中的BI参数对应的时间值后，根据该时间值发起随机接入。
可选地，在根据所述随机接入回退指示发起随机接入时，是在随机接入响应的回退指示中指示的多个BI值中，根据终端的用户需求和/或终端类型确定的BI值发起随机接入。
可选地，在基站通过在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示时，是通过在MAC子头中携带该终端类型指示和该终端类型对应的BI参数，指示该终端的BI值的。
可选地，所述终端是根据以下内容之一或者其组合进行分类：终端类型、终端用户业务的服务质量等级指示(Quality of Service Class Indicator，QCI)需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的RAN侧切片slice、该终端业务所属的RAN侧切片slice；和/或，当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
可选地，进一步包括：接收基站向终端指示的回退值门限，终端在小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，在大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；或，接收基站向终端指示的接入因子，并根据接入因子对BI值进行修正，其中，基站指示的接入因子在终端时延需求越高时所述接入因子指示的终端接入概率越大。
第二方面，本发明实施例提供了一种随机接入回退指示方法，包括：基站接收终端发送的随机接入请求Msg1；发送随机接入回退指示，指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入。
可选地，在所述随机接入回退指示中，对特定终端的默认回退参数为0，该特定终端为低时延用户类型终端或低时延业务类型终端。
可选地，所述随机接入回退指示是根据接收随机接入请求的随机接入资源为对应类型和需求的终端分配的，其中，基站预先为不同类型的终端分配不同的随机接入资源。
可选地，所述随机接入回退指示中的BI参数在不同类型终端下对应不同的时间值。
可选地，基站在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示，所述BI值是根据终端的用户需求和/或终端类型确定的。
可选地，在基站通过在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示时，是通过在MAC子头中携带该终端类型指示和该终端类型对应的BI参数，指示该终端的BI值的。
可选地，基站在发送随机接入回退指示前，还包括：对终端进行分类，并使不同类型终端应用不同的回退参数，包括：根据以下内容之一或者其组合对终端进行分类：终端类型、终端用户业务的QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的RAN侧切片slice、该终端业务所属的RAN侧切片slice；和/或，当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
可选地，基站确定终端类型后，选择与该终端类型相对应的BI值，并通过在随机接入响应的回退指示中指示BI值进行随机接入回退指示时，进一步包括：向终端指示回退值门限，终端在小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，在大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；或，向终端指示接入因子，终端时延需求越高所述接入因子指示的终端接入概率越大。
第三方面，本发明实施例提供了一种随机接入回退后的随机接入装置，包括：发送模块，用于向基站发送随机接入请求Msg1；接收模块，用于接收基站发送的随机接入回退指示，所述随机接入回退指示用以指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入；发送模块进一步用于根据所述随机接入回退指示发起随机接入。
可选地，发送模块进一步用于在所述随机接入回退指示中默认回退参数为0时，在最近的资源上发起随机接入；其中，在所述随机接入回退指示中，对特定终端的默认回退参数为0，特定终端为低时延用户类型终端或低时延业务类型终端。
可选地，发送模块进一步用于在向基站发送随机接入请求Msg1时，是在基站预先为不同类型的终端分配的不同随机接入资源上，根据终端类型在相应的随机接入资源上发送随机接入请求Msg1。
可选地，发送模块进一步用于在根据所述随机接入回退指示发起随机接入时，是在基站预设随机接入回退指示中的BI参数在不同类型终端下对应不同的时间值下，根据终端类型确定所述随机接入回退指示中的BI参数对应的时间值后，根据该时间值发起随机接入。
可选地，发送模块进一步用于在根据所述随机接入回退指示发起随机接入时，是在随机接入响应的回退指示中指示的多个BI值中，根据终端的用户需求和/或终端类型确定的BI值发起随机接入。
可选地，发送模块进一步用于在基站通过在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示时，是通过在MAC子头中携带该终端类型指示和该终端类型对应的BI参数，指示该终端的BI值的。
可选地，所述终端是根据以下内容之一或者其组合进行分类：终端类型、终端用户业务的QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的RAN侧切片slice、该终端业务所属的RAN侧切片slice；和/或，当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
可选地，接收模块进一步用于接收基站向终端指示的回退值门限；发送模块进一步用于在小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，在大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；或，接收模块进一步用于接收基站向终端指示的接入因子；发送模块进一步用于根据接入因子对BI值进行修正，其中，基站指示的接入因子在终端时延需求越高时所述接入因子指示的终端接入概率越大。
第四方面，本发明实施例提供了一种随机接入回退指示装置，包括：请求接收模块，用于接收终端发送的随机接入请求Msg1；指示模块，用于发送随机接入回退指示，指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入。
可选地，指示模块进一步用于在所述随机接入回退指示中，对特定终端的默认回退参数为0，该特定终端为低时延用户类型终端或低时延业务类型终端。
可选地，所述随机接入回退指示是根据接收随机接入请求的随机接入资源为对应类型和需求的终端分配的，其中，预先为不同类型的终端分配不同的随机接入资源。
可选地，所述随机接入回退指示中的BI参数在不同类型终端下对应不同的时间值。
可选地，指示模块进一步用于在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示，所述BI值是根据终端的用户需求和/或终端类型确定的。
可选地，指示模块进一步用于在通过在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示时，是通过在MAC子头中携带该终端类型指示和该终端类型对应的BI参数，指示该终端的BI值的。
可选地，指示模块进一步用于在发送随机接入回退指示前，还包括：对终端进行分类，并使不同类型终端应用不同的回退参数，包括：根据以下内容之一或者其组合对终端进行 分类：终端类型、终端用户业务的QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的RAN侧切片slice、该终端业务所属的RAN侧切片slice；和/或，当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
可选地，指示模块进一步用于在确定终端类型后，选择与该终端类型相对应的BI值，并通过在随机接入响应的回退指示中指示BI值进行随机接入回退指示时，进一步包括：向终端指示回退值门限，终端在小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，在大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；或，向终端指示接入因子，终端时延需求越高所述接入因子指示的终端接入概率越大。
第五方面，提供一种终端，该终端包括：处理器、收发机和存储器；所述收发机，用于在所述处理器的控制下接收和发送数据，所述处理器，用于读取所述存储器中的程序，执行上述第一方面中任一项所述的方法。
第六方面，提供一种基站，该装置包括：处理器、收发机和存储器；所述收发机，用于在所述处理器的控制下接收和发送数据，所述处理器，用于读取所述存储器中的程序，执行上述第二方面中任一项所述的方法。
第七方面，提供一种计算机可读存储介质，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行上述第一方面中任一项所述的方法。
第八方面，提供一种计算机可读存储介质，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行上述第二方面中任一项所述的方法。
在本发明实施例提供的技术方案中，基站在确定发送随机接入回退指示时，会指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入；而终端则会根据自身类型和/或基站发送的随机接入回退指示发起随机接入，由于在回退、发起随机接入过程中，考虑到了终端类型等用户需求，因此能够克服当前的随机接入回退机制不能适应当前多样化的用户需求的问题，进一步的，能够解决用户不能快速接入网络，导致后续业务数据传输阻塞的问题。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本发明的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1为背景技术中竞争随机接入过程示意图；
图2为背景技术中非竞争随机接入过程示意图；
图3为背景技术中E/T/R/R/BI MAC子头结构示意图；
图4为本发明实施例中基站侧随机接入回退指示方法实施流程示意图；
图5为本发明实施例中终端侧随机接入回退后的随机接入方法实施流程示意图；
图6为本发明实施例中指示多个BI值的MAC子头1示意图；
图7为本发明实施例中指示多个BI值的MAC子头2示意图；
图8为本发明实施例中终端侧的随机接入回退后的随机接入装置结构示意图；
图9为本发明实施例中基站侧随机接入回退指示装置结构示意图；
图10为本发明实施例中基站结构示意图；
图11为本发明实施例中终端结构示意图。
具体实施方式
发明人在发明过程中注意到：
当前的随机接入回退机制对所有终端都是一样的，但是，在下一代无线(next generation Radio，NR)***中引入多样化的用户需求，使得不同用户有不同的时延可靠性要求，对于要求快速接入的用户，如超高可靠性与超低时延通信(Ultra Reliable&Low Latency Communication，URLLC)用户，这种机制可能导致该用户不能快速接入网络，导致后续业务数据传输阻塞。
基于此，本发明实施例中将提供一种解决在NR***中如何针对多样化的终端和业务需求的技术方案，通过该方案，在随机接入失败后，能够有效发起后续随机接入过程，既保障低时延需求终端快速接入，又使得随机接入资源利用平均化，降低随机接入碰撞概率，从而最大化随机接入成功率。下面结合附图对本发明的具体实施方式进行说明。
在说明过程中，分别会涉及到终端侧以及基站侧的实施，有的方案仅需终端侧实施，有的方案仅需基站侧实施，有的方案需终端侧以及基站侧配合实施，下面将会分别进行说明，然后还将给出实施的实例以更好地理解本发明实施例中给出的方案的实施。
图4为基站侧随机接入回退指示方法实施流程示意图，如图所示，可以包括：
步骤401、基站接收终端发送的随机接入请求，其中，所述随机接入请求为Msg1消息；
步骤402、基站发送随机接入回退指示，所述随机接入回退指示用以指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入。
图5为终端侧随机接入回退后的随机接入方法实施流程示意图，如图所示，可以包括：
步骤501、终端向基站发送随机接入请求，其中，所述随机接入请求为Msg1消息；
步骤502、终端接收基站发送的随机接入回退指示，所述随机接入回退指示用以指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入；
步骤503、终端根据随机接入回退指示发起随机接入。
方案实施中，针对不同需求的用户，在随机接入失败后采用不同的回退参数，使得低时延用户能快速接入网络。
实施中，基站在发送随机接入回退指示前，还可以包括：对终端进行分类，并使不同类型终端应用不同的回退参数。其中，对终端进行分类，可包括：根据以下内容之一或者其组合对终端进行分类：终端类型、终端用户业务的QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的RAN侧切片(slice)、该终端业务所属的RAN侧切片；和/或，当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
具体的，对终端进行分类，使得不同类型终端可以应用不同的回退参数，包括以下一种方式之一或其组合：
方式一：为终端进行不同的分类，不同类型(category)的终端应用不同的回退参数，分类依据为以下一种或其组合：终端类型、该终端或该终端户业务的QCI需求、该终端或该终端业务所属的网络或RAN侧切片。
分类依据为：终端类型，如增强机器类通信(Enhanced Machine Type Communications，eMTC)类型终端或URLLC类型终端，和/或，该终端或该终端户业务的QCI需求，和/或，该终端或该终端业务所属的网络或RAN(Radio Access Network，无线接入网)侧切片slice等。低时延终端或有低时延业务的终端可以定义为更高的优先级。
方式二：当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此定义终端类型，确定应用的回退参数。
当终端具有多种业务时，根据触发随机接入的业务需求，确定应用的回退参数，如终端有URLLC业务时采用最小时延的回退参数，只有时延要求不高的业务时采用较大时延的回退参数。
下面对基站侧进行指示和/或终端侧再次发起新的随机接入的几种方式进行说明。
方式一
该方式下，在终端的用户需求为低时延用户时，忽略BI，在最近的资源上发起随机接入。具体可以如下：
基站侧：在所述随机接入回退指示中，对特定终端的默认回退参数设置为0，该特定终端为低时延用户类型终端或低时延业务类型终端。
终端侧：在所述随机接入回退指示中默认回退参数为0，且该终端为低时延用户类型终端或低时延业务类型终端时，在最近的资源上发起随机接入。
实施中，也可以采用另一种方式，也即：对于低时延用户，即时延要求高的用户，随机接入失败后忽略回退指示(backoff indicator)，立刻在最近的资源上重新发起随机接入尝试，即发送Msg1。此时的BI MAC子头可以参见图3所示。
具体实施可以如下：
实施例一
本例中，对于特定类型终端，终端可自行忽略回退指示，当然也可以采用在所述随机接入回退指示中默认回退参数为0时，在最近的资源上发起随机接入的方式。
基站侧：接收小区内终端发送的随机接入请求(Msg1)，根据终端密度、碰撞概率和随机接入资源使用情况，在随机接入响应(Msg2)中发送回退指示，指示随机接入失败的终端下次发起随机接入尝试的时间参数，例如指示默认回退参数为0。
终端侧：终端判断自己的终端类型，如果是对时延要求非常严格，要求极低接入时延的终端，可以忽略回退参数，判断随机接入失败后立即发起下一次随机接入尝试；或者，在确定所述随机接入回退指示中默认回退参数为0时，在最近的资源上发起随机接入；否则，如果是对时延要求不严格的终端，则在随机接入失败后，应用基站侧发送的BI参数，计算下次随机接入尝试的时刻并发起随机接入。
方式二
本例中，基站为不同类型的终端分配不同的随机接入资源，基站根据接收随机接入请求的随机接入资源为对应类型和需求的终端分配回退指示。
基站侧：
随机接入回退指示是根据接收随机接入请求的随机接入资源为对应类型和需求的终端分配的，其中，基站预先为不同类型的终端分配不同的随机接入资源。
具体的，基站根据接收到的PRACH资源时频位置确定RA-RNTI，并在随机接入响应窗内用RA-RNTI调度发送随机接入响应，该随机接入响应中携带针对该终端的用户需求的BI指示，所述PRACH资源时频位置是基站预先为不同类型的终端分配的。
终端侧：
在向基站发送随机接入请求(Msg1)时，是在基站预先为不同类型的终端分配的不同随机接入资源上，根据终端类型在相应的随机接入资源上发送随机接入请求(Msg1)。
具体的，根据终端的用户需求确定对应的PRACH资源时频位置，并在该位置上发送Msg1，并在随机接入响应窗内用RA-RNTI接收随机接入响应后，根据随机接入响应中携带的BI指示发起随机接入。
实施中，基站为不同时延要求的用户配置不同的随机接入时频资源(PRACH资源)，基站根据接收到的PRACH资源时频位置确定RA-RNTI，并以此调度包含回退指示BI的随机接入响应，只有在该时频资源上发送过Msg1的终端遵循该回退指示。这样，网络侧可以根据PRACH资源位置判断终端时延要求，并指示合理的回退时间长度参数。而对于终端来说，不同时延要求的终端是在不同的PRACH资源上发送的随机接入请求(Msg1)，可以确定在何处以何种RA-RNTI接收随机接入响应，并接收到对应的BI。这种方案下不同需求的终端的随机接入时频资源完全分开。此时的BI MAC子头可以参考图3。
具体实施可以如下：
实施例二
本例中，不同需求终端配置不同的随机接入资源(时频资源)，从而接收不同的BI值。
基站侧：
步骤一：分配两组或多组随机接入资源，每组随机接入资源具有不重叠的时频资源位置，每组时频资源对应一类终端。
步骤二：基站在配置的随机接入时频资源上接收随机接入请求(Msg1)，根据该随机接入时频资源位置确定终端类型，并确定终端需求，只要是时延需求。
步骤三：基站如果无法接入该终端，则根据该终端发送随机接入请求(Msg1)的时频资源，确定随机接入响应窗，并根据该时频资源位置计算出RA-RNTI，在随机接入响应窗内用RA-RNTI调度发送随机接入响应，该随机接入响应中携带针对该终端或该类终端的BI指示。
终端侧：
步骤一：终端接收基站侧发送的随机接入资源配置，满足随机接入资源对应不同的终端类型。
步骤二：终端根据自己的类型和业务需求，从对应的随机接入资源组中选择最近的随机接入时频资源发送随机接入请求。
步骤三：终端依据发送随机接入请求(Msg1)的时频资源，确定随机接入响应窗并计算接收随机接入响应所用的RA-RNTI，在随机接入响应窗内用RA-RNTI接收随机接入响应，如果该随机接入响应中携带BI指示，则在随机接入失败后使用该BI指示计算重新发起随机接入尝试的时刻，并发起新的随机接入尝试。
方式三
本例中，基站为终端发送回退指示，对于不同类型终端，BI指示域有不同的映射表，相同的BI参数针对不同的终端可用映射为不同的时间值。
基站侧：
随机接入回退指示中的BI参数在不同类型终端下对应不同的时间值。
具体的，基站通过BI值中的回退时延参数数值进行随机接入回退指示，回退时延参数数值与不同类型终端有映射关系。
终端侧：
在根据所述随机接入回退指示发起随机接入时，是在基站预设随机接入回退指示中的BI参数在不同类型终端下对应不同的时间值下，根据终端类型确定所述随机接入回退指示中的BI参数对应的时间值后，根据该时间值发起随机接入。
具体的，根据终端类型与回退时延参数数值的映射关系计算BI值中的回退时延参数数值，并根据该回退时延参数数值确定的时刻发起随机接入。
如，基站指示一个BI值，不同需求的终端将其映射为不同的回退时延参数数值，例如BI＝1时，传统LTE中表示10ms，NR中对于低时延终端可以表示为更短值，如1ms。
具体实施可以如下：
实施例三
本例中，不同需求终端将相同BI值映射为不同时间值。
基站侧：接收小区内终端发送的随机接入请求(Msg1)，根据终端密度、碰撞概率和随机接入资源使用情况，在Msg2随机接入响应中发送回退指示，指示随机接入失败的终端下次发起随机接入尝试的时间参数。
终端侧：终端判断自己的终端类型，根据终端类型计算BI域对应的回退时延参数，例如BI＝1，时延要求不高的终端解读为10ms，低时延高的终端解读为1ms。终端在随机接入失败后，根据解读出的回退时延参数，计算重新发起随机接入尝试的时刻，并发起新的随机接入尝试。
本实施例中基站可以不用知道终端类型。
方式四
本例中，基站在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示，所述BI值是根据终端的用户需求和/或终端类型确定的。
具体的，如前所述，对终端进行分类，使得不同类型终端可以应用不同的回退参数，包括：为终端进行不同的分类，不同类型(category)的终端应用不同的回退参数，分类依 据为以下一种或其组合：终端类型、该终端或该终端户业务的QCI需求、该终端或该终端业务所属的网络或RAN侧切片(slice)；和/或，当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此定义终端类型，确定应用的回退参数。
基站侧：
基站在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示，所述BI值是根据终端的用户需求和/或终端类型确定的。
终端侧：
在根据所述随机接入回退指示发起随机接入时，是在随机接入响应的回退指示中指示的多个BI值中，根据终端的用户需求和/或终端类型确定的BI值发起随机接入。
实施中，在基站通过在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示时，是通过在MAC子头中携带该终端类型指示和该终端类型对应的BI参数，指示该终端的BI值的。
实施中也还可以是在MAC子头中携带该终端的终端优先级指示和该终端优先级对应的BI参数。
实施中，基站在随机接入响应的回退指示中指示多个BI值，并指定该BI值对应的终端类型(category)。这种方式下需要修改BI MAC子头，以便用以指示多个BI值，图6为指示多个BI值的MAC子头1示意图，图7为指示多个BI值的MAC子头2示意图，指示多个BI值的MAC子头可以如图6或图7所示，图6中，固定携带2个BI域，“P”指示对应的终端类型或指终端优先级，“BI1”和“BI2”是针对不同类型终端的回退指示。图7中，回退指示可以有一个或多个，“E1”域用于指示后续是否有另一个BI值。
具体实施可以如下：
实施例四
本例中，随机接入响应中携带针对不同需求终端的多个BI值，例中BI MAC子头可以参见图6或图7所示。
基站侧：接收小区内终端发送的随机接入请求(Msg1)，根据终端密度、碰撞概率和随机接入资源使用情况，在随机接入响应(Msg2)中发送回退指示，指示不同类型终端随机接入失败后，下次发起随机接入尝试的时间参数，BI MAC子头中携带终端类型优先级指示和每种优先级对应的BI参数，不同终端类型对应的BI参数映射到实际时延参数的取值可以相同或不同。也即，在基站通过在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示时，是通过在MAC子头中携带该终端的用户需求的优先级指示和该种优先级对应的BI参数指示该终端的BI值的。
终端侧：终端判断自己的终端类型，根据终端类型及其优先级读取对应的BI域，并映射车回退时延参数数值。终端在随机接入失败后，根据获取的回退时延参数，计算重新发起随机接入尝试的时刻，并发起新的随机接入尝试。也即，在根据终端的用户需求与BI值的对应关系确定该终端的BI值，并根据该BI值发起随机接入时，是根据MAC子头中携带的终端的用户需求的优先级指示和该种优先级对应的BI参数确定该终端的BI值的。
方式五
基站侧：
基站确定终端类型后，选择与该终端类型相对应的BI值，并通过在随机接入响应的回退指示中指示BI值进行随机接入回退指示时，还可以进一步包括：向终端指示回退值门限，终端在小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，在大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；或，向终端指示接入因子，终端时延需求越高所述接入因子指示的终端接入概率越大。
终端侧：
还可以进一步包括：接收基站向终端指示的回退值门限，终端在小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，在大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；或，接收基站向终端指示的接入因子，并根据接入因子对BI值进行修正，其中，基站指示的接入因子在终端时延需求越高时所述接入因子指示的终端接入概率越大。
实施中，针对不同终端引入了多个BI值后，可能存在的一个问题是随机接入资源使用不均匀，增大随机接入请求(Msg1)碰撞概率。例如在子帧1指示了两个BI，一个对应T1，一个对应T2，其中T1<T2，假设有一个低时延终端和一个普通终端同时收到该时刻的回退指示并都随机接入失败需要发起随机接入，则在随机接入失败后的0-T1时间段内任意时刻，发起Msg1的概率为1/T1+1/T2，在T1-T2时间段内任意时刻，发起Msg1的概率为1/T2。为了解决这个问题，可以采用以下任意一种方式：
方式1：不同的BI长度指示的回退值采用不同的算法选择重新发送Msg1的时刻，如设置一个回退值门限Th，BI对应的回退值T<Th时，采用均匀分布计算重新进行随机接入的时刻，T>Th时，采用非均匀分布算法，使得前部分时间段选择的概率低于后部分时间段选择的概率。
方式2：引入接入因子F对回退参数做修正，低时延用户的接入因子较大，如为1，时延要求不严格的用户在前部分时间段内接入因子较小，使得在前半段发起随机接入的概率较低。如果没有多种BI值，则接入因子都为1。
具体实施可以如下：
实施例五
本例中，不同需求终端采用不同算法选择重新发起随机接入时刻(根据门限确定)。
实施中，在基站在确定终端的用户需求后，选择与该用户需求相对应的BI值，并通过在随机接入响应的回退指示中指示BI值进行随机接入回退指示时，进一步包括：基站向终端指示回退值门限。终端在该终端的BI参数小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，在该终端的BI参数大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻。
在终端根据终端的用户需求与BI值以及随机接入时刻算法的对应关系发起随机接入时，进一步包括：终端接收基站向终端指示的回退值门限，终端在该终端的BI参数小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，在该终端的BI参数大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻。
步骤一：终端接收回退指示算法的门限值BITh，该门限值可以是***消息中携带的，也可以是随机接入响应中携带的；
步骤二：终端发起随机接入过程，如果接收到BI参数，计算并存储其对应的回退时延参数；
步骤三：终端在随机接入失败后，比较接收到的BI参数与门限值BITh的大小，如果小于门限值，可以采用均匀分布计算下次随机接入尝试时刻，如果大于门限，则采用非均匀算法，使得选择离本次随机接入失败时刻近的时间点的概率低于选择离本次随机接入失败时刻远的时间点的概率。
实施例六
本例中，不同需求终端采用不同算法选择重新发起随机接入时刻(根据是否有多个BI参数确定)。
实施中，在基站在确定终端的用户需求后，选择与该用户需求相对应的BI参数值，并通过在随机接入响应的回退指示中指示BI值进行随机接入回退指示时，进一步包括：基站向终端指示接入因子，在终端的用户需求需要的时延越低接入因子越大。
在根据终端的用户需求与BI值以及随机接入时刻算法的对应关系发起随机接入时，进一步包括：终端接收基站向终端指示的接入因子，并根据接入因子对该终端的BI参数值进行修正。
步骤一：终端发起随机接入过程，如果接收到携带多个BI域的随机接入响应，根据终端分类确定对该终端有效的BI域，并根据映射规则确定该BI域对应的回退时延参数数 值；
步骤二：终端在随机接入失败后，如果该终端类型应用的是数值较小的回退时延参数，可以采用均匀分布计算下次随机接入尝试时刻，如果该终端类型应用的是数值较大的回退时延参数，则采用非均匀算法，使得选择离本次随机接入失败时刻近的时间点的概率低于选择离本次随机接入失败时刻远的时间点的概率。
基于同一发明构思，本发明实施例中还提供了一种长期演进多载波升级***中的基站侧设备、用户设备、及长期演进多载波升级***，由于这些设备解决问题的原理与长期演进多载波升级***中动态分配上行控制信道预留资源的方法相似，因此这些设备的实施可以参见方法的实施，重复之处不再赘述。
图8为终端侧的随机接入回退后的随机接入装置结构示意图，如图所示，可以包括：
发送模块801，用于向基站发送随机接入请求Msg1；
接收模块802，用于接收基站发送的随机接入回退指示，所述随机接入回退指示用以指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入；
发送模块801进一步用于根据所述随机接入回退指示发起随机接入。
实施中，发送模块进一步用于在所述随机接入回退指示中默认回退参数为0时，在最近的资源上发起随机接入；其中，在所述随机接入回退指示中，对特定终端的默认回退参数为0，特定终端为低时延用户类型终端或低时延业务类型终端。
实施中，发送模块进一步用于在向基站发送随机接入请求Msg1时，是在基站预先为不同类型的终端分配的不同随机接入资源上，根据终端类型在相应的随机接入资源上发送随机接入请求Msg1。
实施中，发送模块进一步用于在根据所述随机接入回退指示发起随机接入时，是在基站预设随机接入回退指示中的BI参数在不同类型终端下对应不同的时间值下，根据终端类型确定所述随机接入回退指示中的BI参数对应的时间值后，根据该时间值发起随机接入。
实施中，发送模块进一步用于在根据所述随机接入回退指示发起随机接入时，是在随机接入响应的回退指示中指示的多个BI值中，根据终端的用户需求和/或终端类型确定的BI值发起随机接入。
实施中，发送模块进一步用于在基站通过在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示时，是通过在MAC子头中携带该终端类型指示和该终端类型对应的BI参数，指示该终端的BI值的。
实施中，所述终端是根据以下内容之一或者其组合进行分类：终端类型、终端用户业 务的QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的RAN侧切片slice、该终端业务所属的RAN侧切片slice；和/或，当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
实施中，接收模块进一步用于接收基站向终端指示的回退值门限；发送模块进一步用于在小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，在大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻。或，接收模块进一步用于接收基站向终端指示的接入因子；发送模块进一步用于根据接入因子对BI值进行修正，其中，基站指示的接入因子在终端时延需求越高时所述接入因子指示的终端接入概率越大。
图9为基站侧随机接入回退指示装置结构示意图，如图所示，可以包括：
请求接收模块901，用于接收终端发送的随机接入请求Msg1；
指示模块902，用于发送随机接入回退指示，指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入。
实施中，指示模块进一步用于在所述随机接入回退指示中，对特定终端的默认回退参数为0，该特定终端为低时延用户类型终端或低时延业务类型终端。
实施中，所述随机接入回退指示是根据接收随机接入请求的随机接入资源为对应类型和需求的终端分配的，其中，预先为不同类型的终端分配不同的随机接入资源。
实施中，所述随机接入回退指示中的BI参数在不同类型终端下对应不同的时间值。
实施中，指示模块进一步用于在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示，BI值是根据终端的用户需求和/或终端类型确定的。
实施中，指示模块进一步用于在通过在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示时，是通过在MAC子头中携带该终端类型指示和该终端类型对应的BI参数，指示该终端的BI值的。
实施中，指示模块进一步用于在发送随机接入回退指示前，还包括：对终端进行分类，并使不同类型终端应用不同的回退参数，包括：根据以下内容之一或者其组合对终端进行分类：终端类型、终端用户业务的QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的RAN侧切片slice、该终端业务所属的RAN侧切片slice；和/或，当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
实施中，指示模块进一步用于在确定终端类型后，选择与该终端类型相对应的BI值，并通过在随机接入响应的回退指示中指示BI值进行随机接入回退指示时，进一步包括： 向终端指示回退值门限，终端在小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，在大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；或，向终端指示接入因子，终端时延需求越高所述接入因子指示的终端接入概率越大。
为了描述的方便，以上所述装置的各部分以功能分为各种模块或单元分别描述。当然，在实施本发明时可以把各模块或单元的功能在同一个或多个软件或硬件中实现。
在实施本发明实施例提供的技术方案时，可以按如下方式实施。
图10为基站结构示意图，如图所示，基站中包括：
处理器1000，用于读取存储器1020中的程序，执行下列过程：
根据收发机需要进行数据处理；
收发机1010，用于在处理器1000的控制下接收和发送数据，执行下列过程：
接收终端发送的随机接入请求Msg1；发送随机接入回退指示，指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入。
实施中，在所述随机接入回退指示中，对特定终端的默认回退参数为0，该特定终端为低时延用户类型终端或低时延业务类型终端。
实施中，所述随机接入回退指示是根据接收随机接入请求的随机接入资源为对应类型和需求的终端分配的，其中，基站预先为不同类型的终端分配不同的随机接入资源。
实施中，所述随机接入回退指示中的BI参数在不同类型终端下对应不同的时间值。
实施中，基站在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示，所述BI值是根据终端的用户需求和/或终端类型确定的。
实施中，在基站通过在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示时，是通过在MAC子头中携带该终端类型指示和该终端类型对应的BI参数，指示该终端的BI值的。
实施中，基站在发送随机接入回退指示前，还包括：对终端进行分类，并使不同类型终端应用不同的回退参数，包括：根据以下内容之一或者其组合对终端进行分类：终端类型、终端用户业务的QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的RAN侧切片slice、该终端业务所属的RAN侧切片slice；和/或，当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
实施中，基站确定终端类型后，选择与该终端类型相对应的BI值，并通过在随机接入响应的回退指示中指示BI值进行随机接入回退指示时，进一步包括：向终端指示回退值门限，终端在小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻， 在大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；或，向终端指示接入因子，终端时延需求越高所述接入因子指示的终端接入概率越大。
其中，在图10中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器1000代表的一个或多个处理器和存储器1020代表的存储器的各种电路链接在一起。总线架构还可以将诸如***设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口1030提供接口。收发机1010可以是多个元件，即包括发送机和收发机，提供用于在传输介质上与各种其他装置通信的单元。处理器1000负责管理总线架构和通常的处理，存储器1020可以存储处理器1000在执行操作时所使用的数据。
图11为终端结构示意图，如图所示，终端包括：处理器1100，用于读取存储器1120中的程序，执行下列过程：根据收发机需要进行数据处理；收发机1110，用于在处理器1100的控制下接收和发送数据，执行下列过程：向基站发送随机接入请求Msg1；
接收基站发送的随机接入回退指示，所述随机接入回退指示用以指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入；根据所述随机接入回退指示发起随机接入。
实施中，在所述随机接入回退指示中默认回退参数为0时，在最近的资源上发起随机接入；其中，在所述随机接入回退指示中，对特定终端的默认回退参数为0，特定终端为低时延用户类型终端或低时延业务类型终端。
实施中，在向基站发送随机接入请求Msg1时，是在基站预先为不同类型的终端分配的不同随机接入资源上，根据终端类型在相应的随机接入资源上发送随机接入请求Msg1。
实施中，在根据所述随机接入回退指示发起随机接入时，是在基站预设随机接入回退指示中的BI参数在不同类型终端下对应不同的时间值下，根据终端类型确定所述随机接入回退指示中的BI参数对应的时间值后，根据该时间值发起随机接入。
实施中，在根据所述随机接入回退指示发起随机接入时，是在随机接入响应的回退指示中指示的多个BI值中，根据终端的用户需求和/或终端类型确定的BI值发起随机接入。
实施中，在基站通过在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示时，是通过在MAC子头中携带该终端类型指示和该终端类型对应的BI参数，指示该终端的BI值的。
实施中，所述终端是根据以下内容之一或者其组合进行分类：终端类型、终端用户业务的QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的RAN侧切片slice、该终端业务所属的RAN侧切片slice；和/或，当终端具有多 种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
实施中，进一步包括：接收基站向终端指示的回退值门限，终端在小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，在大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；或，接收基站向终端指示的接入因子，并根据接入因子对BI值进行修正，其中，基站指示的接入因子在终端时延需求越高时所述接入因子指示的终端接入概率越大。
其中，在图11中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器1100代表的一个或多个处理器和存储器1120代表的存储器的各种电路链接在一起。总线架构还可以将诸如***设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口1140提供接口。收发机1110可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元。针对不同的用户设备，用户接口1130还可以是能够外接内接需要设备的接口，连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。
处理器1100负责管理总线架构和通常的处理，存储器1120可以存储处理器1100在执行操作时所使用的数据。
综上所述，在本发明实施例提供的技术方案中，针对不同需求的用户，在随机接入失败后采用不同的指示，使得低时延用户能快速接入网络。具体提供了如下方案：
对于低时延用户，即时延要求高的用户，在随机接入回退指示中默认回退参数为0；或者，随机接入失败后忽略回退指示backoff indicator，立刻在最近的资源上重新发起随机接入尝试。
基站为不同时延要求的用户配置不同的随机接入时频资源(PRACH资源)，基站根据接收到的PRACH资源时频位置确定RA-RNTI，并以此调度包含回退指示BI的随机接入响应，只有在该时频资源上发送过Msg1的终端遵循该回退指示。这样，网络侧可以根据PRACH资源位置判断终端时延要求，并指示合理的回退时间长度参数。而对于终端来说，不同时延要求的终端是在不同的PRACH资源上发送的随机接入请求Msg1，可以确定在何处以何种RA-RNTI接收随机接入响应，并接收到对应的BI。这种方法要求不同需求的终端的随机接入时频资源完全分开。
基站指示一个BI值，不同需求的终端将其映射为不同的回退时延参数数值。
基站在随机接入响应的回退指示中指示多个BI值，并指定该BI值对应的终端类型(category)。
为终端进行不同的分类，不同类型(category)的终端应用不同的BI值。
当终端具有多种业务时，根据触发随机接入的业务需求，确定应用的回退参数，如终端有URLLC业务时采用最小时延的回退参数，只有时延要求不高的业务时采用较大时延的回退参数。
还进一步提供了在多组BI参数时，使得随机接入资源时延均匀化的方案。
采用上述的各方案，容易看出，在随机接入失败后，能够有效发起后续随机接入过程，既保障低时延需求终端快速接入，又使得随机接入资源利用平均化，降低随机接入碰撞概率，从而最大化随机接入成功率。
本领域内的技术人员应明白，本发明的实施例可提供为方法、***、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(***)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (50)

  1. 一种随机接入回退后的随机接入方法，其特征在于，包括：
    终端向基站发送随机接入请求；
    所述终端接收基站发送的随机接入回退指示，所述随机接入回退指示用以指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入；
    所述终端根据所述随机接入回退指示发起随机接入。
  2. 如权利要求1所述的方法，其特征在于，所述终端根据所述随机接入回退指示发起随机接入，包括：
    若所述随机接入回退指示中默认回退参数为0，且所述终端为低时延用户类型终端或低时延业务类型终端，则所述终端在最近的资源上发起随机接入；其中，在所述随机接入回退指示中，对特定终端的默认回退参数设置为0，所述特定终端为低时延用户类型终端或低时延业务类型终端。
  3. 如权利要求1所述的方法，其特征在于，所述终端向基站发送随机接入请求，包括：
    所述终端在基站预先为不同类型的终端分配的不同随机接入资源上，根据所述终端的终端类型，在相应的随机接入资源上发送随机接入请求。
  4. 如权利要求1所述的方法，其特征在于，所述终端根据所述随机接入回退指示发起随机接入，包括：
    所述终端根据终端类型确定所述随机接入回退指示中的回退指示BI参数对应的时间值后，根据确定出的时间值发起随机接入；其中，所述随机接入回退指示中的BI参数，在不同类型终端下对应不同的时间值。
  5. 如权利要求1所述的方法，其特征在于，所述终端根据所述随机接入回退指示发起随机接入，包括：
    所述终端在随机接入响应的回退指示中指示的多个BI值中，根据终端的用户需求和/或终端类型确定的BI值发起随机接入。
  6. 如权利要求5所述的方法，其特征在于，所述随机接入响应的回退指示中指示多个BI值，是通过在媒体接入控制MAC子头中携带多个终端类型指示以及分别与所述多个终端类型对应的BI参数实现的。
  7. 如权利要求1所述的方法，其特征在于，所述终端是根据以下内容之一或者其组合进行分类：
    终端类型、终端用户业务的服务质量等级指示QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的无线接入网RAN侧切片、该终端业务所属的RAN侧切片；和/或，
    当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
  8. 如权利要求1至7任一所述的方法，其特征在于，进一步包括：
    所述终端接收所述基站指示的回退值门限，若所述随机接入回退指示所指示的所述终端的BI参数值小于所述回退值门限，则所述终端采用均匀分布算法计算重新进行随机接入的时刻，若所述随机接入回退指示所指示的所述终端的BI参数值大于所述回退值门限，则所述终端采用非均匀分布算法计算重新进行随机接入的时刻；
    或，所述终端接收所述基站指示的接入因子，并根据所述接入因子对所述随机接入回退指示所指示的所述终端的BI参数值进行修正，其中，所述接入因子在终端时延需求越高时所述接入因子指示的终端接入概率越大。
  9. 一种随机接入回退指示方法，其特征在于，包括：
    基站接收终端发送的随机接入请求；
    所述基站发送随机接入回退指示，所述随机接入回退指示用于指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入。
  10. 如权利要求9所述的方法，其特征在于，在所述随机接入回退指示中，对特定终端的默认回退参数设置为0，所述特定终端为低时延用户类型终端或低时延业务类型终端。
  11. 如权利要求9所述的方法，其特征在于，所述随机接入回退指示是根据接收随机接入请求的随机接入资源为对应类型和需求的终端分配的，其中，基站预先为不同类型的终端分配不同的随机接入资源。
  12. 如权利要求9所述的方法，其特征在于，所述随机接入回退指示中的回退指示BI参数在不同类型终端下对应不同的时间值。
  13. 如权利要求9所述的方法，其特征在于，所述随机接入响应的回退指示中指示多个BI值进行随机接入回退指示，所述BI值是根据终端的用户需求和/或终端类型确定的。
  14. 如权利要求13所述的方法，其特征在于，所述随机接入响应的回退指示中指示多个BI值，是通过在媒体接入控制MAC子头中携带多个终端类型指示以及分别与所述多个终端类型对应的BI参数实现的。
  15. 如权利要求9所述的方法，其特征在于，所述基站在发送随机接入回退指示前，还包括：
    对终端进行分类，并使不同类型终端应用不同的回退参数；
    其中，所述对终端进行分类，包括：
    根据以下内容之一或者其组合对终端进行分类：终端类型、终端用户业务的服务质量等级指示QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的无线接入网RAN侧切片、该终端业务所属的RAN侧切片；和/或，
    当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
  16. 如权利要求9至15任一所述的方法，其特征在于，进一步包括：
    所述基站向终端指示回退值门限，若所述随机接入回退指示所指示的所述终端的BI参数值小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，若所述随机接入回退指示所指示的所述终端的BI参数值大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；
    或，所述基站向终端指示接入因子，终端时延需求越高所述接入因子指示的终端接入概率越大。
  17. 一种随机接入回退后的随机接入装置，其特征在于，包括：
    发送模块，用于向基站发送随机接入请求；
    接收模块，用于接收基站发送的随机接入回退指示，所述随机接入回退指示用以指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入；
    所述发送模块进一步用于根据所述随机接入回退指示发起随机接入。
  18. 如权利要求17所述的装置，其特征在于，所述发送模块，具体用于：
    若所述随机接入回退指示中默认回退参数为0，且所述终端为低时延用户类型终端或低时延业务类型终端，则在最近的资源上发起随机接入；其中，在所述随机接入回退指示中，对特定终端的默认回退参数设置为0，所述特定终端为低时延用户类型终端或低时延业务类型终端。
  19. 如权利要求17所述的装置，其特征在于，所述发送模块，具体用于：
    在基站预先为不同类型的终端分配的不同随机接入资源上，根据所述终端的终端类型，在相应的随机接入资源上发送随机接入请求。
  20. 如权利要求17所述的装置，其特征在于，所述发送模块，具体用于：
    根据终端类型确定所述随机接入回退指示中的回退指示BI参数对应的时间值后，根据确定出的时间值发起随机接入；其中，所述随机接入回退指示中的BI参数，在不同类型终端下对应不同的时间值。
  21. 如权利要求17所述的装置，其特征在于，所述发送模块，具体用于：
    在随机接入响应的回退指示中指示的多个BI值中，根据终端的用户需求和/或终端类型确定的BI值发起随机接入。
  22. 如权利要求21所述的装置，其特征在于，所述发送模块，具体用于：
    通过在媒体接入控制MAC子头中携带多个终端类型指示以及分别与所述多个终端类型对应的BI参数，实现在所述随机接入响应的回退指示中指示多个BI值。
  23. 如权利要求17所述的装置，其特征在于，所述终端是根据以下内容之一或者其组合进行分类：终端类型、终端用户业务的服务质量等级指示QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的无线接入网RAN侧切片、该终端业务所属的RAN侧切片；和/或，
    当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
  24. 如权利要求17至23任一所述的装置，其特征在于，所述接收模块，进一步用于：接收基站向终端指示的回退值门限；所述发送模块，进一步用于：在所述随机接入回退指示所指示的所述终端的BI参数值小于所述回退值门限时，采用均匀分布算法计算重新进行随机接入的时刻，在所述随机接入回退指示所指示的所述终端的BI参数值大于所述回退值门限时，采用非均匀分布算法计算重新进行随机接入的时刻；
    或，所述接收模块，进一步用于接收基站向终端指示的接入因子；所述发送模块，进一步用于根据所述接入因子对所述随机接入回退指示所指示的所述终端的BI参数值进行修正，其中，基站指示的接入因子在终端时延需求越高时所述接入因子指示的终端接入概率越大。
  25. 一种随机接入回退指示装置，其特征在于，包括：
    请求接收模块，用于接收终端发送的随机接入请求；
    指示模块，用于发送随机接入回退指示，所述随机接入回退指示用于指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入。
  26. 如权利要求25所述的装置，其特征在于，所述指示模块，进一步用于：
    在所述随机接入回退指示中，对特定终端的默认回退参数设置为0，所述特定终端为低时延用户类型终端或低时延业务类型终端。
  27. 如权利要求25所述的装置，其特征在于，所述随机接入回退指示是根据接收随机接入请求的随机接入资源为对应类型和需求的终端分配的，其中，预先为不同类型的终端分配不同的随机接入资源。
  28. 如权利要求25所述的装置，其特征在于，所述随机接入回退指示中的回退指示BI参数在不同类型终端下对应不同的时间值。
  29. 如权利要求25所述的装置，其特征在于，所述指示模块，具体用于：
    在随机接入响应的回退指示中指示多个BI值进行随机接入回退指示，所述BI值是根据终端的用户需求和/或终端类型确定的。
  30. 如权利要求29所述的装置，其特征在于，所述指示模块，具体用于：
    在媒体接入控制MAC子头中携带多个终端类型指示以及分别与所述多个终端类型对应的BI参数。
  31. 如权利要求25所述的装置，其特征在于，所述指示模块，进一步用于：
    在发送随机接入回退指示前，对终端进行分类，并使不同类型终端应用不同的回退参数；其中，所述对终端进行分类，包括：
    根据以下内容之一或者其组合对终端进行分类：终端类型、终端用户业务的服务质量等级指示QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的无线接入网络网络RAN侧切片、该终端业务所属的RAN侧切片；和/或，
    当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
  32. 如权利要求25至31任一所述的装置，其特征在于，所述指示模块，进一步用于：
    向终端指示回退值门限，若所述随机接入回退指示所指示的所述终端的BI参数值小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，若所述随机接入回退指示所指示的所述终端的BI参数值大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；
    或，向终端指示接入因子，终端时延需求越高所述接入因子指示的终端接入概率越大。
  33. 一种终端，其特征在于，包括：处理器、收发机和存储器；
    所述处理器，用于读取所述存储器中的程序，执行下列过程：通过所述收发机向基站发送随机接入请求，接收基站发送的随机接入回退指示，所述随机接入回退指示用以指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入；以及，根据所述随机接入回退指示发起随机接入；
    所述收发机，用于在所述处理器的控制下接收和发送数据。
  34. 如权利要求33所述的终端，其特征在于，所述处理器，具体用于：
    若所述随机接入回退指示中默认回退参数为0，且所述终端为低时延用户类型终端或低时延业务类型终端，则在最近的资源上发起随机接入；其中，在所述随机接入回退指示 中，对特定终端的默认回退参数设置为0，所述特定终端为低时延用户类型终端或低时延业务类型终端。
  35. 如权利要求33所述的终端，其特征在于，所述处理器，具体用于：
    在基站预先为不同类型的终端分配的不同随机接入资源上，根据所述终端的终端类型，通过所述收发机在相应的随机接入资源上发送随机接入请求。
  36. 如权利要求33所述的终端，其特征在于，所述处理器，具体用于：
    根据终端类型确定所述随机接入回退指示中的回退指示BI参数对应的时间值后，根据确定出的时间值，通过所述收发机发起随机接入；其中，所述随机接入回退指示中的BI参数，在不同类型终端下对应不同的时间值。
  37. 如权利要求33所述的终端，其特征在于，所述处理器，具体用于：
    在随机接入响应的回退指示中指示的多个BI值中，根据终端的用户需求和/或终端类型确定的BI值发起随机接入。
  38. 如权利要求37所述的终端，其特征在于，所述随机接入响应的回退指示中指示多个BI值，是通过在媒体接入控制MAC子头中携带多个终端类型指示以及分别与所述多个终端类型对应的BI参数实现的。
  39. 如权利要求33所述的终端，其特征在于，所述处理器，具体用于：
    根据以下内容之一或者其组合，多终端进行分类：
    终端类型、终端用户业务的服务质量等级指示QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的无线接入网RAN侧切片、该终端业务所属的RAN侧切片；和/或，
    当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
  40. 如权利要求33至39任一所述的终端，其特征在于，所述处理器，进一步用于：
    通过所述收发机接收所述基站指示的回退值门限，若所述随机接入回退指示所指示的所述终端的BI参数值小于所述回退值门限，则采用均匀分布算法计算重新进行随机接入的时刻，若所述随机接入回退指示所指示的所述终端的BI参数值大于所述回退值门限，则采用非均匀分布算法计算重新进行随机接入的时刻；
    或，通过所述收发机接收所述基站指示的接入因子，并根据所述接入因子对所述随机接入回退指示所指示的所述终端的BI参数值进行修正，其中，所述接入因子在终端时延需求越高时所述接入因子指示的终端接入概率越大。
  41. 一种基站，其特征在于，包括：处理器、收发机和存储器；
    所述处理器，用于读取所述存储器中的程序，执行下列过程：通过所述收发机接收终端发送的随机接入请求；以及，发送随机接入回退指示，所述随机接入回退指示用于指示不同类型终端应用不同的回退参数，在随机接入失败后重新发起随机接入；
    所述收发机，用于在所述处理器的控制下接收和发送数据。
  42. 如权利要求41所述的基站，其特征在于，在所述随机接入回退指示中，对特定终端的默认回退参数设置为0，所述特定终端为低时延用户类型终端或低时延业务类型终端。
  43. 如权利要求41所述的基站，其特征在于，所述随机接入回退指示是根据接收随机接入请求的随机接入资源为对应类型和需求的终端分配的，其中，基站预先为不同类型的终端分配不同的随机接入资源。
  44. 如权利要求41所述的基站，其特征在于，所述随机接入回退指示中的BI参数在不同类型终端下对应不同的时间值。
  45. 如权利要求41所述的基站，其特征在于，所述随机接入响应的回退指示中指示多个BI值进行随机接入回退指示，所述BI值是根据终端的用户需求和/或终端类型确定的。
  46. 如权利要求45所述的基站，其特征在于，所述随机接入响应的回退指示中指示多个BI值，是通过在MAC子头中携带多个终端类型指示以及分别与所述多个终端类型对应的BI参数实现的。
  47. 如权利要求41所述的基站，其特征在于，所述处理器，进一步用于：
    在发送随机接入回退指示前，对终端进行分类，并使不同类型终端应用不同的回退参数；
    其中，所述对终端进行分类，包括：
    根据以下内容之一或者其组合对终端进行分类：终端类型、终端用户业务的QCI需求、终端业务的QCI需求、该终端所属的网络、该终端业务所属的网络、该终端所属的RAN侧切片、该终端业务所属的RAN侧切片；和/或，
    当终端具有多种业务时，将触发随机接入的业务需求作为当前终端需求并据此对终端进行分类。
  48. 如权利要求41至47任一所述的基站，其特征在于，所述处理器，进一步用于：
    通过所述收发机向终端指示回退值门限，若所述随机接入回退指示所指示的所述终端的BI参数值小于所述回退值门限时采用均匀分布算法计算重新进行随机接入的时刻，若所述随机接入回退指示所指示的所述终端的BI参数值大于所述回退值门限时采用非均匀分布算法计算重新进行随机接入的时刻；
    或，通过所述收发机向终端指示接入因子，终端时延需求越高所述接入因子指示的终端接入概率越大。
  49. 一种计算机存储介质，其特征在于，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行权利要求1-8任一项所述的方法。
  50. 一种计算机存储介质，其特征在于，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行权利要求9-16任一项所述的方法。
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