WO2019161754A1 - Procédé et terminal d'accès aléatoire, et dispositif de réseau - Google Patents

Procédé et terminal d'accès aléatoire, et dispositif de réseau Download PDF

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Publication number
WO2019161754A1
WO2019161754A1 PCT/CN2019/075258 CN2019075258W WO2019161754A1 WO 2019161754 A1 WO2019161754 A1 WO 2019161754A1 CN 2019075258 W CN2019075258 W CN 2019075258W WO 2019161754 A1 WO2019161754 A1 WO 2019161754A1
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WIPO (PCT)
Prior art keywords
random access
access resource
terminal
information
indication information
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PCT/CN2019/075258
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English (en)
Chinese (zh)
Inventor
张向东
常俊仁
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华为技术有限公司
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Publication of WO2019161754A1 publication Critical patent/WO2019161754A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • 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
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access

Definitions

  • the present application relates to the field of wireless communications, and in particular, to a random access method, a terminal, and a network device.
  • a fifth-generation (5G) communication system uses a higher carrier frequency than Long Term Evolution (LTE), and generally uses a carrier frequency greater than 6 gigahertz (GHz), such as 28 GHz, 38 GHz, or The 60 GHz band, etc., to achieve wireless communication with greater bandwidth and higher transmission rate. Due to the high carrier frequency, the wireless signal it transmits undergoes more severe fading during spatial propagation, and it is difficult to detect the wireless signal even at the receiving end. To this end, beamforming (BF) technology is used in the 5G communication system to obtain a beam with good directivity to improve the power in the transmitting direction and improve the signal to interference ratio (Signal to Interference plus Noise Ratio) at the receiving end. SINR). The Beam Sweeping process is used in the 5G New Radio (NR) to determine the beam pair between the Transmission Reception Point (TRP) and the terminal.
  • GHz gigahertz
  • SINR Signal to Interference plus Noise Ratio
  • Each downlink beam base station sends a Synchronization Signal Block (SSB), including a primary and secondary synchronization signal and a Physical Broadcast Channel (PBCH), for the terminal to acquire downlink synchronization and necessary system information.
  • SSB Synchronization Signal Block
  • PBCH Physical Broadcast Channel
  • the base station configures the correspondence between one or more SSB slots and the random access resources through the system message, so that the terminal can learn the SSB after completing the downlink beam selection based on the SSB.
  • a random access resource initiates random access to the network.
  • the application provides a random access method, a terminal, and a network device to reduce the delay in the random access process.
  • the application provides a random access method, including:
  • the terminal selects a target random access resource according to the indication information
  • the terminal initiates a random access procedure by using the target random access resource.
  • the indication information includes: identifier information of a random access resource whose load satisfies a low load condition, and/or identifier information of a random access resource whose load satisfies a high load condition.
  • the identifier information is one or more of the following: a random access resource subset information, a preamble identifier subset information, a beam identifier, and a synchronization signal block identifier.
  • the indication information includes: when the identifier of the random access resource that satisfies the low load condition is loaded,
  • the terminal selects a target random access resource according to the indication information, and includes:
  • the terminal selects the target random access resource in a random access resource whose load satisfies a low load condition.
  • the indication information includes: when the identifier of the random access resource that satisfies the high load condition is loaded,
  • the terminal selects a target random access resource according to the indication information, and includes:
  • the terminal selects the target random access resource in a random access resource other than the random access resource whose load satisfies a high load condition.
  • the identification information includes a beam identification
  • the terminal Before the terminal selects the target random access resource according to the indication information, the terminal further includes:
  • the terminal selects a target random access resource according to the indication information, and includes:
  • the identification information includes a synchronization signal block identifier
  • the terminal selects a target random access resource according to the indication information, and includes:
  • the terminal before the terminal selects the target random access resource according to the indication information, the terminal further includes:
  • the terminal determines to change the current random access resource when the backoff information meets the preset condition.
  • determining, by the terminal, that the current random access resource is changed including:
  • the terminal determines to change the current random access resource when the backoff information is greater than the first preset threshold.
  • determining, by the terminal, that the current random access resource is changed including:
  • the terminal generates a backoff variable according to the backoff information
  • the terminal determines to change the current random access resource when the backoff variable is greater than the second preset threshold.
  • the application provides a random access method, including:
  • the terminal receives the backoff information sent by the network device
  • determining, by the terminal, that the current random access resource is changed including:
  • the terminal determines to change the current random access resource when the backoff information is greater than the first preset threshold.
  • determining, by the terminal, that the current random access resource is changed including:
  • the terminal generates a backoff variable according to the backoff information
  • the terminal determines to change the current random access resource when the backoff variable is greater than the second preset threshold.
  • the method further includes:
  • the terminal receives the indication information sent by the network device, where the indication information is used to indicate load information of the random access resource.
  • the indication information includes: identifier information of a random access resource whose load satisfies a low load condition, and/or identifier information of a random access resource whose load satisfies a high load condition.
  • the terminal can select the target random access resource by combining the load condition of the random access resource.
  • the identifier information is one or more of the following: a random access resource subset information, a preamble identifier subset information, a beam identifier, and a synchronization signal block identifier.
  • the terminal after determining that the current random access resource is changed, the terminal determines to change the current random access resource according to the backoff information.
  • the terminal selects a target random access resource according to the indication information
  • the terminal initiates a random access procedure by using the target random access resource.
  • the indication information includes: when the identifier of the random access resource that satisfies the low load condition is loaded,
  • the terminal selects a target random access resource according to the indication information, and includes:
  • the terminal selects the target random access resource in a random access resource whose load satisfies a low load condition.
  • the indication information includes: when the identifier of the random access resource that satisfies the high load condition is loaded,
  • the terminal selects a target random access resource according to the indication information, and includes:
  • the terminal selects the target random access resource in a random access resource other than the random access resource whose load satisfies a high load condition.
  • the application provides a random access method, including:
  • the network device determines indication information, where the indication information is used to indicate load information of the candidate random access resource
  • the network device sends the indication information to the terminal.
  • the indication information includes: identifier information of a random access resource whose load satisfies a low load condition, and/or identifier information of a random access resource whose load satisfies a high load condition.
  • the identifier information is one or more of the following: a random access resource subset information, a preamble identifier subset information, a beam identifier, and a synchronization signal block identifier.
  • the method further includes:
  • the network device sends backoff information to the terminal.
  • the application provides a random access method, including:
  • the network device determines the backoff information
  • the network device sends the backoff information to the terminal.
  • the application provides a terminal, including:
  • a receiving module configured to receive indication information sent by the network device, where the indication information is used to indicate load information of the candidate random access resource;
  • a processing module configured to select a target random access resource according to the indication information, and initiate a random access procedure by using the target random access resource.
  • the indication information includes: identifier information of a random access resource whose load satisfies a low load condition, and/or identifier information of a random access resource whose load satisfies a high load condition.
  • the identifier information is one or more of the following: a random access resource subset information, a preamble identifier subset information, a beam identifier, and a synchronization signal block identifier.
  • the indication information includes: when the identifier of the random access resource that satisfies the low load condition is loaded,
  • the processing module is specifically configured to select the target random access resource in a random access resource in which the load meets a low load condition.
  • the indication information includes: when the identifier of the random access resource that satisfies the high load condition is loaded,
  • the processing module is specifically configured to select the target random access resource in a random access resource other than the random access resource in which the load satisfies a high load condition.
  • the receiving module is further configured to receive backoff information sent by the network device;
  • the processing module is configured to determine to change the current random access resource when the backoff information meets a preset condition.
  • the application provides a terminal, including:
  • a receiving module configured to receive backoff information sent by the network device
  • the processing module is configured to determine to change the current random access resource when the preset information is met according to the backoff information.
  • the processing module is specifically configured to determine to change the current random access resource when the backoff information is greater than the first preset threshold.
  • the processing module is configured to generate a backoff variable according to the backoff information, and determine to change the current random access resource when the backoff variable is greater than a second preset threshold.
  • the receiving module is further configured to receive indication information sent by the network device, where the indication information is used to indicate load information of the candidate random access resource.
  • the indication information includes: identifier information of a random access resource whose load satisfies a low load condition, and/or identifier information of a random access resource whose load satisfies a high load condition.
  • the application provides a network device, including:
  • a processing module configured to determine indication information, where the indication information is used to indicate load information of a candidate random access resource
  • a sending module configured to send the indication information to the terminal.
  • the indication information includes: identifier information of a random access resource whose load satisfies a low load condition, and/or identifier information of a random access resource whose load satisfies a high load condition.
  • the identifier information is one or more of the following: a random access resource subset information, a preamble identifier subset information, a beam identifier, and a synchronization signal block identifier.
  • the sending module is further configured to send backoff information to the terminal.
  • the application provides a network device, including:
  • a processing module configured to determine backoff information
  • a sending module configured to send the backoff information to the terminal.
  • the present application provides a random access device, the device comprising a processor and a memory, wherein the memory is used to store a program, and the processor calls a program stored in the memory to perform the first aspect or the second aspect of the present application.
  • a method is provided, and the device may be a terminal or a chip on the terminal.
  • the application provides a random access device, the device includes a processor and a memory, the memory is used to store a program, and the processor calls a program stored in the memory to perform the third aspect or the fourth aspect of the present application.
  • the device may be a network device or a chip on a network device.
  • a communication device including a processor, and an interface.
  • the processor performs the functions of the processing module in the fifth to eighth aspects.
  • the interface completes the functions of the receiving module/sending module in the fifth to eighth aspects.
  • the present application provides a computer storage medium for storing a program for performing any one of the methods of any one of the above first to fourth aspects.
  • the network device sends the indication information to the terminal, where the indication information is used to indicate the load information of the candidate random access resource, and the terminal selects the target random access resource according to the indication information.
  • the random access procedure is initiated by using the foregoing target random access resource, and the random access resource that initiates the random access procedure is selected according to the load condition of the candidate random access resource, so as to minimize the delay of the random access.
  • FIG. 1 is a schematic structural diagram of a communication system provided by the present application.
  • FIG. 2 is a schematic flowchart of a random access method according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a beam number in an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a random access method according to another embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a network device according to an embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a terminal according to another embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a terminal according to another embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a terminal according to another embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of a network device according to another embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram of a network device according to another embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram of a network device according to another embodiment of the present disclosure.
  • the embodiments of the present application can be applied to a wireless communication system.
  • the wireless communication system mentioned in the embodiments of the present application includes but is not limited to: Narrow Band-Internet of Things (NB-IoT), global mobile Global System for Mobile Communications (GSM), Enhanced Data Rate for GSM Evolution (EDGE), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA) 2000 System (Code Division Multiple Access, CDMA2000), Time Division-Synchronization Code Division Multiple Access (TD-SCDMA), Long Term Evolution (LTE) and next-generation 5G mobile communication systems
  • NB-IoT Narrow Band-Internet of Things
  • GSM Global System for Mobile Communications
  • EDGE Enhanced Data Rate for GSM Evolution
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • CDMA2000 Code Division Multiple Access 2000 System
  • TD-SCDMA Time Division-Synchronization Code Division Multiple Access
  • LTE Long Term Evolution
  • next-generation 5G mobile communication systems The three application scenarios are enhanced
  • FIG. 1 is a schematic structural diagram of a communication system provided by the present application.
  • the communication system 01 includes a network device 101 and a terminal 102.
  • the network device 101 can also be connected to the core network.
  • Network device 101 may also be in communication with an internet protocol (IP) network 200, such as the Internet, a private IP network, or other data network.
  • IP internet protocol
  • Network devices provide services to terminals within coverage.
  • network device 101 provides wireless access to one or more terminals within range of network device 101.
  • network devices can communicate with each other.
  • the terminal device 102 includes but is not limited to a mobile station (MS, Mobile Station), a mobile terminal, a mobile telephone, a handset, and a portable device.
  • the terminal can communicate with one or more core networks via a radio access network (RAN), for example, the terminal can be a mobile phone (or "cellular" phone), with wireless communication capabilities.
  • RAN radio access network
  • the terminal 102 can also be a portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile device or device.
  • Network device 101 may be a device for communicating with terminal 102.
  • it may be a base transceiver station (BTS) in a GSM system or a CDMA system, or a base station (NodeB, NB) in a WCDMA system, or an evolved base station (eNB) in an LTE system.
  • BTS base transceiver station
  • NodeB, NB base station
  • eNB evolved base station
  • the network device may also be a relay station, an access point, an in-vehicle device, or the like.
  • D2D Device to Device
  • the network device may also be a terminal functioning as a base station.
  • the number and types of terminals included in the communication system 01 shown in FIG. 1 are merely exemplary, and the embodiment of the present application is not limited thereto.
  • it may also include more cellular terminals that communicate with network devices, or more D2D terminals that perform device-to-device D2D communication, which are not described in the drawings for the sake of brevity.
  • the communication system 01 may not be limited to include the network device and the terminal, and may also include a core network device or a device for carrying a virtualized network function, etc., which will be apparent to those skilled in the art. I will not elaborate on them here.
  • FIG. 2 is a schematic flowchart of a random access method according to an embodiment of the present disclosure. As shown in FIG. 2, the method includes:
  • the network device sends indication information to the terminal, where the indication information is used to indicate load information of the candidate random access resource.
  • the candidate random access resource may be a random access resource that is not currently used, or a random access resource that may be used in the future. Of course, not limited to this, it may also include random access resources that are not used in the future.
  • the load information of the candidate random access resource includes load information of one or more random access resources.
  • the indication information is sent to the terminal.
  • the terminal selects a target random access resource according to the foregoing indication information.
  • the terminal After receiving the indication information, the terminal selects the target random access resource according to the indication information.
  • the terminal initiates a random access process by using the target random access resource.
  • the terminal determines, by using the load information indicating the candidate random access resource indicated by the indication information, that the more suitable target random access resource initiates the random access procedure.
  • the random access resources include random access time-frequency resources and/or preambles.
  • the target random access resource includes a time-frequency resource and/or a sequence resource corresponding to a subset of random access time-frequency resources and/or a subset of preamble indices.
  • the batch access RACH resources may include: a Packet Random Access Channel (PRACH) configuration index, a speed identifier, a PRACH frequency domain offset, and the like. If it is an coverage enhancement scenario, the random access resource time-frequency subset (which may also include a repeated start subframe, a control channel repetition number, a frequency hopping mode, and the like).
  • PRACH Packet Random Access Channel
  • the random access resource time-frequency subset (which may also include a repeated start subframe, a control channel repetition number, a frequency hopping mode, and the like).
  • the initiating the random access procedure may be performed by the terminal transmitting, on the random access time-frequency resource in the target random access resource, a preamble corresponding to the preamble index subset in the target random access resource to the network device.
  • the random access preamble selected in the code may also use the foregoing target random access resource to send a random access request to the network device, and is not limited herein.
  • the initiating the random access procedure may be performed by the terminal transmitting, on the random access time-frequency resource in the target random access resource, a preamble corresponding to the preamble index subset in the target random access resource to the network device.
  • the random access preamble selected in the code may also use the foregoing target random access resource to send a random access request to the network device, and is not limited herein.
  • the terminal that is the execution subject in the present application is a terminal that satisfies the random access condition.
  • a terminal with a higher priority or lower priority in a random access procedure initiated in multiple terminals is a terminal that satisfies the random access condition.
  • the network device sends the indication information to the terminal, where the indication information is used to indicate the load information of the candidate random access resource, and the terminal selects the target random access resource according to the indication information, and uses the target random access resource to initiate the randomization.
  • the access process implements random access resources that initiate a random access procedure according to the load condition of the candidate random access resources, so as to minimize the delay of random access.
  • the indication information is used to indicate that the load satisfies a random access resource with a low load condition, and/or a random access resource whose load satisfies a high load condition.
  • the foregoing indication information includes: identifier information of a random access resource whose load satisfies a low load condition, and/or identifier information of a random access resource whose load satisfies a high load condition.
  • the indication information is used to indicate load information of the candidate random access resource, and may be a random access resource identifier indicating a random access resource or a load low load condition that satisfies a load low load condition, and/or The indication information indicates an identifier of a random access resource that satisfies a high load condition or a random access resource that bears a high load condition.
  • the network device may indicate a random access resource with a light load, and may also indicate a random access resource with a higher load.
  • the random access resource whose load meets the low load condition may refer to a random access resource whose load is lower than a preset threshold a. Alternatively, it may also refer to a random access resource with a lower load than other random access resources, for example, a total of M random access resources, and relatively low load N1 random access resources are considered to be load satisfied. Random access resources under low load conditions. M is an integer greater than 0, and N1 is an integer greater than 0 and less than or equal to M.
  • a random access resource whose load satisfies a high load condition may refer to a random access resource whose load is higher than a preset threshold b. Alternatively, it may also refer to a random access resource with a higher load than other random access resources, for example, a total of M random access resources, and relatively high load N2 random access resources are considered to be load satisfied. Random access resources under high load conditions. M is an integer greater than 0, and N2 is an integer greater than 0 and less than or equal to M.
  • the foregoing identifier information may be one or more of the following: a subset of RACH resources, a subset of preamble indices, a beam identifier, and a synchronization signal block (SSB) logo. That is, the load information of the corresponding random access resource is indicated by one or more of the information.
  • SSB synchronization signal block
  • the identification information of the random access resource indicating that the load satisfies the low load condition, and/or the identification information of the random access resource whose load satisfies the high load condition may be pre-defined or configured. Then, the identification information of the random access resource whose load satisfies the low load condition and/or the identification information of the random access resource whose load satisfies the high load condition are directly or indirectly indicated by the foregoing identification information.
  • the terminal may directly determine the corresponding random access resource.
  • the terminal may indirectly determine the corresponding random access resource.
  • the terminal may determine the SSB corresponding to the beam identifier according to the beam identifier before the terminal selects the target random access resource according to the indication information.
  • the terminal selects the target random access resource according to the indication information, and the terminal may determine, according to the SSB corresponding to the beam identifier, the random access resource associated with the SSB corresponding to the beam identifier, and then the random connection of the SSB associated with the beam identifier. In the resource, select the target random access resource.
  • the network device may configure the association between the SSB and the random access resource in advance through the configuration information, and then, after the network device indicates the beam identifier, determine the SSB corresponding to the beam, and then determine the random access corresponding to the SSB. Resources.
  • the terminal selects the target random access resource according to the indication information, and the terminal may determine the random access resource associated with the SSB according to the SSB, and then select the target random access in the random access resource associated with the SSB. Resources.
  • one or more SSBs may be associated with the same random access resource, for example, one or more SSBs are associated with the same random access resource subset/subset of subsets (subset of RACH resources/subset of Preamble indices), then, the subset of random access resources/preamble identifiers corresponding to one or more SSBs included in the indication information may be different from each other.
  • the subset of random access resources/the subset of preamble identifiers corresponding to one or more SSBs corresponding to one or more beam identifiers included in the indication information may be different from each other.
  • the indication information includes: identifier information of a random access resource whose load satisfies a low load condition.
  • the terminal selects the target random access resource according to the indication information, and the terminal may select the target random access resource in the random access resources in which the load satisfies the low load condition.
  • the probability that the random access resources satisfying the low load condition are selected as the target random access resources is improved.
  • the priority of the random access resources or the selection probability is determined in order from the low to the high, and no limitation is imposed herein.
  • the indication information includes: identifier information of the random access resource whose load meets a high load condition.
  • the terminal selects the target random access resource according to the indication information, and the terminal may select the target random access resource in the random access resource except the random access resource in which the load satisfies the high load condition.
  • the probability that the random access resources satisfying the high load condition are selected as the target random access resources is reduced.
  • the priority of the random access resources or the selection probability is determined in order from the highest to the lowest, and is not limited herein.
  • the terminal may further receive a backoff indicator (BI) sent by the network device, and determine, when the backoff information meets the preset condition, that the current random access resource is changed. .
  • BI backoff indicator
  • the terminal selects the target random access resource according to the indication when the backoff information satisfies the preset condition.
  • the random access resource is changed to reduce the delay, that is, the target random access resource is reselected, and the next random access is initiated on the new random access resource. Try it.
  • the changing the current random access resource may refer to reselecting the random access resource and initiating a new random access attempt on the new random access resource. For example, after the last random access attempt, if the terminal determines to change the current random access resource, the terminal may reselect the random access resource and initiate the next random access attempt on the reselected random access resource.
  • the terminal can maintain the same random access when the random access attempt is initiated on the new random access resource.
  • Preamble send count counter When a random access attempt is made, the terminal collects a preamble transmission counter. If the number of times the random access preamble is sent is greater than a predetermined value (for example, preambleTransMax), the random access may be considered as failed.
  • a predetermined value for example, preambleTransMax
  • the terminal can maintain the number of transmission times counter of the same random access preamble. In this way, when the sum of the number of transmissions of the random access preamble on the different random access resources is greater than the predetermined value, the terminal may also be considered as a random access failure.
  • the terminal may not maintain the same random access preamble transmission number counter, for example, independently count the number of times the random access preamble is sent on different random access resources. This application is not limited.
  • the terminal determines to change the current random access resource when the backoff information is greater than the first preset threshold.
  • the terminal first generates a backoff variable according to the backoff information (which can be recorded as “backoff value”), and determines to change the current random access resource when the backoff variable is greater than the second preset threshold.
  • backoff value the backoff information
  • the first preset threshold and the second preset threshold may be notified to the terminal after the network device is determined, or may be configured by the terminal itself, or specified in the standard, and the present application is not limited.
  • the terminal when there are multiple available random access resources, the terminal first considers the BI of the random access resource currently in use, and if the BI of the currently used random access resource satisfies the preset condition, then the terminal considers To replace the random access resource, you can use the above method to determine the target random access resource.
  • the BI corresponding to the target random access resource may be further considered. If the BI corresponding to the target random access resource does not meet the preset condition, the target random access resource may be used to initiate random access. process.
  • the network device may indicate whether the terminal further uses the BI after determining the new target random access resource, or the terminal itself may decide whether to use the BI after determining the new target random access resource.
  • the use of BI specifically means, for example, that the terminal continues to perform the backoff operation using the BI value.
  • the terminal may also reduce the backoff value according to the actual load condition, which is not specifically limited in this application.
  • the terminal may adjust the backoff information or the backoff variable according to the adjustment coefficient, and the adjustment coefficient may be configured by the network device or determined by the terminal itself. According to the preset rule, the original BI can be calculated together with the adjustment coefficient to obtain new backoff information.
  • the foregoing network device sends the indication information to the terminal, where the network device may send the indication information by means of a broadcast.
  • the network device periodically broadcasts the indication information.
  • the indication information may be sent after the backoff information.
  • the network device sends the indication information by sending the message of the backoff information.
  • the indication information may carry the reserved information in the Medium Access Control Subheader (MAC subheader) in the BI to carry the foregoing indication information.
  • MAC subheader Medium Access Control Subheader
  • the absolute information may be indicated, or the relative information may be indicated.
  • the absolute number of the beam may be indicated, and the relative number of the beam relative to the current beam of the terminal may also be indicated.
  • the E/T/R/R/BI MAC subheader indicates a type of MAC subheader, E represents an extended field, T represents a type field, R identifies a reserved bit field, and BI identifies a Backoff Indicator value field.
  • E represents an extended field
  • T represents a type field
  • R identifies a reserved bit field
  • BI identifies a Backoff Indicator value field.
  • FIG. 3 is a schematic diagram of a beam number in an embodiment of the present application.
  • the network device has 5 transmit beams, and the beam corresponding to SSB3 has the best signal quality for the terminal.
  • the terminal determines that the random access procedure is initiated on the random access resource corresponding to the SSB3, if the network device needs to allow the terminal to backoff the random access initiated by the random access resource corresponding to the SSB3, the network device sends the BI to the terminal.
  • the above indication information is carried by the reserved bits of the E/T/R/R/BI MAC subheader.
  • the two reserved bits may indicate the absolute number of one beam at a time.
  • an information bit may also be reserved, and the indication information is not indicated.
  • 00 in FIG. 3 does not indicate SSB1, but indicates that the network device does not send the indication information.
  • the two reserved bits can indicate up to three numbers.
  • FIG. 4 is a schematic diagram of another beam number in the embodiment of the present application.
  • the two reserved bits may indicate the relative numbers of the two beams at a time.
  • an information bit can also be reserved without indicating the above indication information.
  • the above 00 does not indicate SSB2 and SSB4, but indicates that the network device does not send the indication information.
  • FIG. 5 is a schematic flowchart of a random access method according to another embodiment of the present disclosure. As shown in FIG. 5, the method includes:
  • the terminal receives the backoff information sent by the network device.
  • the terminal determines to change the current random access resource when the preset information is met according to the backoff information.
  • the terminal does not have a large delay.
  • the terminal changes the random access resource to reduce the delay, that is, reselects the target random access resource.
  • the terminal determines to change the current random access resource when the backoff information is greater than the first preset threshold.
  • the terminal first generates a backoff variable according to the backoff information (which may be recorded as a “backoff value”), and determines to change the current random access resource when the backoff variable is greater than the second preset threshold.
  • the backoff information which may be recorded as a “backoff value”
  • the first preset threshold and the second preset threshold may be notified to the terminal after the network device is determined, or may be configured by the terminal itself, or specified in the standard, and the present application is not limited.
  • the network device may send indication information to the terminal, indicating load information of the candidate random access resource, as shown in the foregoing embodiment.
  • the indication information includes: identification information of the random access resource whose load satisfies the low load condition, and/or identification information of the random access resource whose load satisfies the high load condition.
  • the target random access resource after the change is selected in the random access resource whose load satisfies the low load condition.
  • the backoff variable is greater than the second preset threshold
  • determining that the current random access resource is changed is an example. If the indication information includes: the identifier of the random access resource whose load meets the low load condition, the terminal has the backoff variable greater than the second preset threshold. In the random access resource whose load satisfies the low load condition, the target random access resource after the change is selected.
  • the changed target random access resource is selected in the random access resource except the random access resource whose load satisfies the high load condition.
  • the terminal determines that the current random access resource is changed. If the indication information includes: the identifier of the random access resource whose load meets the high load condition, the terminal has the backoff variable greater than the second preset threshold. In the random access resource other than the random access resource whose load satisfies the high load condition, the target random access resource after the change is selected.
  • the method may be used in the foregoing method embodiments, and details are not described herein.
  • FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure. As shown in FIG. 6, the terminal may include: a receiving module 601 and a processing module 602, where:
  • the receiving module 601 is configured to receive indication information sent by the network device, where the indication information is used to indicate load information of the candidate random access resource.
  • the processing module 602 is configured to select a target random access resource according to the indication information, and initiate a random access procedure by using the target random access resource.
  • the indication information includes: identifier information of a random access resource whose load satisfies a low load condition, and/or identifier information of a random access resource whose load satisfies a high load condition.
  • the identifier information is one or more of the following: a random access resource subset information, a preamble identifier subset information, a beam identifier, and a synchronization signal block identifier.
  • the processing module 602 is specifically configured to select the target in the random access resource in which the load meets the low load condition. Random access resources.
  • the processing module 602 when the indication information includes: the identifier information of the random access resource that meets the high load condition, the processing module 602 is specifically configured to use, in addition to the random access resource that the load satisfies the high load condition. In the random access resource, the target random access resource is selected.
  • the receiving module 601 is configured to receive backoff information sent by the network device.
  • the processing module 602 is further configured to: when the backoff information meets a preset condition, determine to change the current random access resource.
  • the processing module 602 is specifically configured to: when the backoff information is greater than the first preset threshold, determine to change the current random access resource.
  • the processing module 602 is specifically configured to generate a backoff variable according to the backoff information, and determine to change the current random access resource when the backoff variable is greater than the second preset threshold.
  • processing module 602 is further configured to receive indication information that is sent by the network device, where the indication information is used to indicate load information of the candidate random access resource.
  • the indication information includes: identifier information of a random access resource whose load satisfies a low load condition, and/or identifier information of a random access resource whose load satisfies a high load condition.
  • FIG. 7 is a schematic structural diagram of a network device according to an embodiment of the present disclosure.
  • the network device may include: a determining module 801 and a sending module 802, where:
  • the determining module 801 is configured to determine indication information, where the indication information is used to indicate load information of the candidate random access resource.
  • the sending module 802 is configured to send the indication information to the terminal.
  • the indication information includes: identifier information of a random access resource whose load satisfies a low load condition, and/or identifier information of a random access resource whose load satisfies a high load condition.
  • the identifier information is one or more of the following: a random access resource subset information, a preamble identifier subset information, a beam identifier, and a synchronization signal block identifier.
  • the sending module 802 is further configured to send the backoff information to the terminal.
  • FIG. 8 is a schematic structural diagram of a terminal according to another embodiment of the present disclosure.
  • the terminal includes a processor 901, an application processor, a memory user interface, and other components (including a power source and the like not shown).
  • the above processing module may be the processor 901 and perform corresponding functions.
  • the sending module and/or the receiving module may be a wireless transceiver 903 in the figure, which performs corresponding functions through an antenna. It will be understood that the various elements shown in the figures are merely illustrative and are not essential elements of the embodiments.
  • the device can perform functions similar to the processor of Figure 8.
  • the device includes a processor, a transmit data processor, and a processor.
  • the above processing module may be the processor 110 and perform corresponding functions.
  • the sending module may be the transmitting data processor 111 of FIG. 10, and the receiving module may be the receiving data processor 112 of FIG.
  • a channel coder and a channel decoder are shown in the drawings, it is to be understood that these modules are not intended to be limiting, and are merely illustrative.
  • the processing device 1000 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem.
  • the communication device in this embodiment can be used as a modulation subsystem therein.
  • the modulation subsystem may include a processor 1003, an interface 1004.
  • the processor 1003 performs the functions of the foregoing processing module
  • the interface 1004 performs the functions of the foregoing sending module and/or the receiving module.
  • the modulation subsystem includes a memory 1006, a processor 1003, and a program stored on the memory and executable on the processor, the processor implementing the method described in the previous embodiments when the program is executed.
  • the memory 1006 may be non-volatile or volatile, and its location may be located inside the modulation subsystem or in the processing device 1000 as long as the memory 1006 can be connected to the The processor 1003 is sufficient.
  • a computer readable storage medium having stored thereon a method of executing execution of the terminal in the foregoing embodiment when the instruction is executed.
  • the communication device in this embodiment is a network device
  • the device shown in FIG. 11 which includes a processor 1201, an application processor, a memory user interface, and other components (including a power source and the like not shown).
  • the above processing module selection module, access module, determination module, etc.
  • the sending module and/or the receiving module may be a wireless transceiver 1203 in the figure, which performs corresponding functions through an antenna. It will be understood that the various elements shown in the figures are illustrative only and are not required to complete the embodiments.
  • the device includes a processor, a transmit data processor, and a processor.
  • the above processing module may be the processor 1301 and perform corresponding functions.
  • the sending module may be the transmitting data processor 1303 in FIG. 12, and the receiving module may be the receiving data processor 1305 in FIG.
  • a channel coder and a channel decoder are shown in the drawings, it is to be understood that these modules are not intended to be limiting, and are merely illustrative.
  • the processing device 1400 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem.
  • the network device in this embodiment can be used as a modulation subsystem therein.
  • the modulation subsystem may include a processor 1403, an interface 1404.
  • the processor 1403 performs the functions of the foregoing processing module
  • the interface 1404 performs the functions of the foregoing sending module and/or the receiving module.
  • the modulation subsystem includes a memory 1406, a processor 1403, and a program stored on the memory and executable on the processor, the processor implementing the above-described embodiment method when the program is executed.
  • the memory 1406 may be non-volatile or volatile, and its location may be located inside the modulation subsystem or in the processing device 1400 as long as the memory 1406 can be connected to the The processor 1403 is sufficient.
  • a computer readable storage medium having stored thereon a method of executing a network device execution when the instruction is executed.
  • the processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), or a field programmable gate array (FPGA). Or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a random access memory (RAM), a flash memory, a read-only memory (ROM), a programmable read only memory or an electrically erasable programmable memory, a register, etc.
  • RAM random access memory
  • ROM read-only memory
  • programmable read only memory or an electrically erasable programmable memory
  • register etc.
  • the storage medium is located in the memory 1002, and the processor 1001 reads the instructions in the memory 1002 and completes the steps of the above method in combination with its hardware.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in the various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .
  • the method proposed in this embodiment is mainly for the problem of how to handle the terminal if another RACH process is performed if a random access (RACH) process is being performed.
  • RACH random access
  • the terminal determines whether to stop the current random access and starts a new random access (RACH) process according to the current random access progress.
  • RACH new random access
  • the RACH process is about to be completed, and the current RACH process does not need to be stopped.
  • the terminal may determine whether to stop the current RACH process by combining the event priority of triggering the new RACH and the priority of the currently performed RACH event, and the progress of the current RACH.
  • the new trigger event has a high priority, and the ongoing RACH process can start, and the ongoing RACH process can be stopped to start a new RACH process.
  • the new trigger event has a low priority and the ongoing RACH process is about to be completed.
  • the original RACH process can be continued without stopping the ongoing RACH process.
  • the priority of the two criteria of triggering the event priority and the RACH progress may be defined, for example, the RACH progress criterion has a higher priority.
  • the terminal If a new event triggers a new RACH procedure and the priority is high, if the terminal does not stop the current RACH procedure, the terminal also needs to adjust the priority of the currently ongoing RACH procedure according to the event priority of the newly triggered RACH procedure.
  • the level for example, can determine the parameters of the BI based on the new priority.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un terminal d'accès aléatoire, et un dispositif de réseau. Le procédé comprend les étapes suivantes : le terminal reçoit des informations d'indication envoyées par le dispositif de réseau, les informations d'indication étant utilisées pour indiquer des informations de charge d'une ressource d'accès aléatoire candidate; le terminal sélectionne une ressource d'accès aléatoire cible, d'après les informations d'indication; et le terminal initie un processus d'accès aléatoire à l'aide de la ressource d'accès aléatoire cible. L'invention permet de sélectionner une ressource d'accès aléatoire pour initier un processus d'accès aléatoire d'après une condition de charge d'une ressource d'accès aléatoire candidate, ce qui réduit au maximum le retard d'accès aléatoire.
PCT/CN2019/075258 2018-02-26 2019-02-15 Procédé et terminal d'accès aléatoire, et dispositif de réseau WO2019161754A1 (fr)

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CN103118416A (zh) * 2011-11-16 2013-05-22 中兴通讯股份有限公司 一种控制网络拥塞的方法及装置
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