WO2021184278A1 - Procédé et système d'accès aléatoire - Google Patents

Procédé et système d'accès aléatoire Download PDF

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Publication number
WO2021184278A1
WO2021184278A1 PCT/CN2020/080123 CN2020080123W WO2021184278A1 WO 2021184278 A1 WO2021184278 A1 WO 2021184278A1 CN 2020080123 W CN2020080123 W CN 2020080123W WO 2021184278 A1 WO2021184278 A1 WO 2021184278A1
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Prior art keywords
equipment
resource
ground
channel
location
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PCT/CN2020/080123
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English (en)
Chinese (zh)
Inventor
李鹏
徐玺钰
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海能达通信股份有限公司
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Priority to PCT/CN2020/080123 priority Critical patent/WO2021184278A1/fr
Publication of WO2021184278A1 publication Critical patent/WO2021184278A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • This application relates to the field of communication technology, and in particular to random access methods and systems.
  • Aerial equipment (such as drones) has a wide range of applications in photographing, disaster relief, express delivery, surveying, etc. As the application scenarios become more abundant and related technologies continue to mature, communication technologies related to aerial equipment have flourished.
  • the present application provides a random access method and system, which can connect aerial equipment to the current communication system, so that the base station can satisfy both the ground equipment access and the aerial equipment access, and the user equipment Access also identifies the user equipment as ground equipment or aerial equipment.
  • the present invention provides the following technical features:
  • a random access method is applied to a base station in a long-term evolution system.
  • the base station stores a channel resource index table, wherein the channel resource index table includes channel resource positions belonging to ground equipment and channel resource positions belonging to air equipment, Moreover, the position of the channel resource belonging to the ground equipment and the position of the channel resource belonging to the aerial equipment do not overlap; the method includes:
  • the access signal of the user equipment is detected at the resource location belonging to the ground equipment, identify the user equipment as a ground equipment and access the communication system;
  • the access signal of the user equipment is detected at the resource location belonging to the air equipment, the user equipment is identified as an air equipment and accesses the communication system.
  • the broadcast system message includes a PRACH configuration index parameter, and a channel frequency domain offset parameter;
  • the method of using ground equipment detection to perform detection at the location of channel resources belonging to ground equipment, and using the detection method of air equipment to perform detection at the location of channel resources belonging to air equipment includes:
  • the current channel resource configuration parameter set includes channel resource parameters belonging to ground equipment and channels belonging to air equipment Resource parameters;
  • the current resource location belonging to the ground device is calculated
  • the current resource location belonging to the air device is calculated
  • the ground equipment detection method is used to perform detection at the current channel resource position belonging to the ground equipment
  • the air equipment detection method is used to perform detection at the current channel resource position belonging to the air equipment.
  • the channel resource parameters of the ground equipment include the system frame number and the subframe number; wherein, the combined result of the system frame number and the subframe number corresponding to the ground equipment , And, the combined result of the system frame number and subframe number corresponding to the air equipment is different;
  • the calculation based on the channel resource parameter of the ground device and the channel frequency domain offset parameter to obtain the current resource location belonging to the ground device includes:
  • the frequency domain resource location and the time domain resource location of the ground equipment are determined as the current resource location of the ground equipment.
  • the channel resource parameters of the air equipment include the system frame number and the subframe number; wherein, the combined result of the system frame number and the subframe number corresponding to the air equipment , And, the combined result of the system frame number and subframe number corresponding to the ground equipment is different;
  • the calculation based on the channel resource parameter of the air device and the channel frequency domain offset parameter to obtain the current resource location belonging to the air device includes:
  • the frequency domain resource location and the time domain resource location of the air equipment are determined as the current resource location of the air equipment.
  • the channel resource parameter of the ground equipment includes a quadruple Among them, the ground equipment corresponds to the quadruple, and the air equipment corresponds to the quadruple is different;
  • the calculation based on the channel resource parameter of the ground device and the channel frequency domain offset parameter to obtain the current resource location belonging to the ground device includes:
  • the frequency domain starting resource position of the ground equipment is calculated according to the preset formula, and the 6 resource blocks starting from the frequency domain starting resource position are regarded as the ground equipment The frequency domain resource location;
  • System frame indicating the location of accessible resources
  • Indicate the first half frame or the second half frame of the accessible resource location Indicates the index of the subframe where the location of the accessible resource is located after the special subframe, Respectively indicate whether the accessible resource locations are all system frames, even-numbered frames or odd-numbered frames, Indicate whether the location of the accessible resource is the first half frame or the second half frame;
  • the frequency domain resource location and the time domain resource location of the ground equipment are determined as the current resource location of the ground equipment.
  • the channel resource parameter of the air equipment includes a quadruple Among them, the ground equipment corresponds to the quadruple, and the air equipment corresponds to the quadruple is different;
  • the calculation based on the channel resource parameter of the air device and the channel frequency domain offset parameter to obtain the current resource location belonging to the air device includes:
  • the frequency domain starting resource position of the air equipment is calculated according to the preset formula, and the 6 resource blocks starting from the frequency domain starting resource position are regarded as the air equipment The frequency domain resource location;
  • System frame indicating the location of accessible resources
  • Indicate the first half frame or the second half frame of the accessible resource location Indicates the index of the subframe where the location of the accessible resource is located after the special subframe, Respectively indicate whether the accessible resource locations are all system frames, even-numbered frames or odd-numbered frames, Indicate whether the location of the accessible resource is the first half frame or the second half frame;
  • the frequency domain resource location and the time domain resource location of the air equipment are determined as the current resource location of the air equipment.
  • the channel resource index table stored by the base station includes:
  • both the base station and the user equipment store the FDD channel resource index table; among them, the FDD channel resource index table includes multiple channel resource configuration parameter sets, and each channel resource configuration parameter set includes The channel resource parameters of the ground equipment and the channel resource parameters of the air equipment;
  • both the base station and the user equipment store a TDD channel resource index table, and the TDD channel resource index table includes a TDD time domain channel resource index table after dividing time domain resources, or, for TDD frequency domain channel resource index table after frequency domain resource division;
  • the FDD channel resource index table includes multiple channel resource configuration parameter sets, and each channel resource configuration parameter set includes channel resource parameters belonging to ground equipment and channel resource parameters belonging to air equipment.
  • Optional include:
  • the determining the resource location corresponding to the broadcast system message and the device type includes: determining the resource of the ground device corresponding to the broadcast system message Location;
  • the determining the resource location corresponding to the broadcast system message and the device type includes: determining the resource corresponding to the broadcast system message and belonging to the air device Location.
  • a random access system includes a base station and a plurality of user terminals.
  • the base station and the user terminals each store a channel resource index table, wherein the channel resource index table includes channel resource positions belonging to ground equipment and channels belonging to air equipment Resource location, and the channel resource location belonging to the ground equipment and the channel resource location belonging to the aerial equipment do not overlap;
  • the user terminal is configured to receive a broadcast system message sent by a base station, and based on the broadcast system message and the device type of the user equipment, determine the resource location corresponding to the broadcast system message and the device type, and send it to the resource The location sends an access signal;
  • the base station is used to send broadcast system messages to the user equipment in the cell for the user equipment to send access signals, use the ground equipment detection method to detect the position of the channel resources belonging to the ground equipment, and use the air equipment detection method to perform the detection in the air
  • the channel resource location of the device is detected. If the user equipment's access signal is detected at the resource location of the ground device, the user equipment is identified as a ground device and connected to the communication system. If the user equipment is detected at the resource location of the air device If the access signal is detected, the user equipment is identified as an aerial device and connected to the communication system.
  • This application proposes a random access method. Since the resource location of the air device is added to the channel resource index table, and the channel resource location of the ground device and the channel resource location of the air device do not overlap, so that the user equipment can access the resource to which it belongs. Send an access signal at the location.
  • the base station may use a detection method suitable for ground equipment to detect the access signal at the resource location belonging to the ground equipment, and if it can be detected, it will access the user equipment and identify the equipment type as ground equipment.
  • the base station can use a detection method suitable for aerial equipment to detect the access signal at the resource location belonging to the aerial equipment, and if it can be detected, it will access the user equipment and identify the equipment type as an aerial equipment.
  • this application can realize random access of ground equipment and aerial equipment in an existing communication system, and can identify the equipment type of user equipment at the same time of access, so that a single cell can support both ground equipment and support The purpose of aerial equipment.
  • 1a-1c are schematic structural diagrams of a random access system provided by an embodiment of this application.
  • FIG. 2 is a flowchart of a random access method provided by an embodiment of the application
  • FIG. 3 is a flowchart of another random access method provided by an embodiment of this application.
  • FIG. 4 is a flowchart of another random access method provided by an embodiment of this application.
  • Fig. 5 is a flowchart of another random access method provided by an embodiment of the application.
  • base stations need to provide customized algorithms for air equipment, including interference cancellation, coordinated cell handover, power control, code rate control, etc.
  • the premise that the base station provides the above customized algorithms is that the user equipment can access the base station, and, The base station can recognize that the user equipment is an aerial equipment.
  • this application provides a second technical idea:
  • the existing communication system namely the Long Term Evolution System (LTE) is used to realize the access of the air equipment and the identification of the air equipment.
  • LTE Long Term Evolution System
  • ground equipment The existing user equipment in the LTE system is usually used on the ground, so it is called ground equipment.
  • the moving speed of ground equipment is slow, so it can also be called low-speed equipment, and the flying speed of aerial equipment is faster, so it can also be called high-speed equipment.
  • this application provides a third technical idea:
  • 3GPP provides a communication protocol: In a cell of the LTE system, ground equipment uses existing methods to access the base station, and air equipment uses 3GPP to provide a communication protocol for air equipment to access the base station. In order to identify the accessed user equipment, the base station needs to perform signaling interaction with the user equipment, thereby identifying that the user equipment is a ground device or an air device.
  • the base station antenna beam has priority for ground coverage, and there will be a large gain loss in the air. In this case, the stability of the base station using the 3GPP communication protocol by the air equipment is poor.
  • the access process and the identification process are two independent processes.
  • the high-speed movement of the air device will cause a large frequency offset in the signaling interaction.
  • the accuracy of base station recognition will be greatly reduced.
  • this application provides a fourth technical idea: it is suitable for existing LTE systems, and can accurately achieve random access of ground equipment and air equipment in a cell, and when user equipment randomly accesses the base station, Accurately identify user equipment as low-speed equipment or high-speed equipment, so that the base station can subsequently distinguish between air equipment and ground equipment.
  • the present application provides a random access system, including a base station 100 and multiple user terminals 200.
  • Multiple user terminals within the cell of the base station can access the base station to communicate and interact with the base station after being powered on. Or, user terminals in other cells can access the base station to communicate with the base station after entering the range of the base station cell. It is understandable that there is a physical random access channel (PRACH) between the base station and the user equipment, and the user equipment can send an access signal to the physical random access channel for the base station to use the physical random access channel. Receive access signal.
  • PRACH physical random access channel
  • a channel resource index table is set in both the base station and the ground equipment, but the original channel resource index table only has the resource location of the ground equipment, which is not applicable to the air equipment.
  • this application adds air equipment to the channel resource index table, that is, the resource locations of the air equipment that are part of the resource locations that are not originally occupied by the ground equipment and cannot send access signals.
  • Fig. 1b for resource allocation in the time domain
  • Fig. 1c for a schematic diagram of resource allocation in the frequency domain. That is, the air equipment is allocated a resource location for sending an access signal to the physical random access channel, and the resource location of the ground equipment does not overlap with the resource location of the air equipment.
  • the air equipment and the ground equipment will send the access signal at their respective resource locations, and the base station will perform detection on the physical random access channel.
  • the access signal is detected from the resource location of the ground equipment, the user equipment is accessed, and the access signal of the ground equipment is identified, and subsequent operations are performed according to the processing operation of the ground equipment.
  • the user equipment If an access signal is detected from the resource location of the air equipment, the user equipment is accessed, and the access signal of the air equipment is identified, and subsequent operations are performed according to the processing operation of the air equipment.
  • the following specifically describes the execution process of the base station and the user equipment.
  • this application needs to perform channel resource allocation operations on the physical random access channel in advance, that is, to allocate channel resources for air equipment.
  • Time Division Duplex TDD
  • Frequency Division Duplex FDD
  • this application provides two implementation manners, and any one of the two implementation manners can be used for channel resource allocation.
  • the first implementation time domain resource allocation.
  • the principle of time domain resource allocation is to separate ground equipment and air equipment from the time domain, and distinguish ground equipment and air equipment through different time domains.
  • the base station stores the updated FDD random access configuration table.
  • Table 1 is an FDD random access configuration table applicable to ground equipment and air equipment, where there are 64 PRACH configuration indexes (0-63), and different configuration indexes indicate different channel resource allocation situations. There are 4 preamble formats (0 ⁇ 3).
  • the channel resources of ground equipment and air equipment are distinguished by the system frame number and subframe number. Table 1 shows that the channel resources of ground equipment and air equipment do not overlap.
  • The'-' in Table 1 indicates that this configuration does not support the allocation of time domain resources different from ground equipment for air equipment access; and the list is only an example to illustrate the time domain resource allocation method of air equipment, and the specific configuration values are not limited only In the table above.
  • a quadruple is used to determine the resource location.
  • the quadruple of the air equipment is added, and the quadruple of the ground equipment and the quadruple of the air equipment are added.
  • the tuples are different.
  • Table 2 is an FDD random access configuration table applicable to ground equipment and air equipment, where there are 64 PRACH configuration indexes (0-63), and different configuration indexes indicate different channel resource allocation situations.
  • Ground equipment resources and air equipment resources are distinguished by a four-tuple method.
  • Table 2 shows that the channel resources of ground equipment and air equipment do not overlap.
  • f RA is the frequency domain resource index
  • Indicate the position of the accessible resource is the first half frame and the second half frame
  • PRACH format 4 is only accessed on the special subframe
  • Table 2'-' indicates that this configuration does not support the allocation of time domain resources different from ground equipment for air equipment access; and the list is only an example to illustrate the time domain resource allocation method of air equipment, and the specific configuration values are not limited to The table above.
  • the second implementation mode frequency domain resource allocation.
  • the principle of frequency domain resource allocation is as follows: the ground equipment and the air equipment are separated in the frequency domain, and the frequency domain of the ground equipment and the frequency domain of the air equipment belong to different positions.
  • the base station originally stores an FDD random access configuration table suitable for ground equipment.
  • the random access configuration table only one frequency domain resource location is allocated for each subframe for random access, that is, one time domain corresponds to one frequency domain Location.
  • the FDD channel resource index table is consistent with Table 1, and will not be repeated here.
  • Table 1 obtained for time domain resource allocation and Table 2 obtained for frequency domain resource allocation will be slightly different, because one subframe of the original LTE system can allocate 1 to 6 frequency domain resources. Add 1 to 2 air device resource locations near the domain resource location (different configurations are selected according to the actual access probability of the air device), and the same resource locations do not overlap.
  • Table 3 is a TDD random access configuration table applicable to ground equipment and air equipment, where there are 64 PRACH configuration indexes (0-63), and different configuration indexes indicate different channel resource allocation situations.
  • Ground equipment resources and air equipment resources are distinguished by a four-tuple method. From Table 3, it can be seen that the channel resources of ground equipment and air equipment do not overlap.
  • f RA is the frequency domain resource index
  • Indicate the position of the accessible resource is the first half frame and the second half frame
  • PRACH format 4 is only accessed on the special subframe
  • Table 3'-' indicates that this configuration does not support the allocation of time domain resources different from ground equipment for air equipment access; and the list is only an example to illustrate the time domain resource allocation method of air equipment, and the specific configuration values are not limited to The table above.
  • the base station and user equipment After allocating channel resources for ground equipment and air equipment, the base station and user equipment will store channel resource index tables for subsequent use.
  • the base station and the user equipment need to store Table 1 (of course, the content in Table 1 can be changed according to actual conditions).
  • the base station and the user equipment need to store Table 2 or Table 3 (of course, the contents of Table 2 and Table 3 can be changed according to actual conditions).
  • the following describes the random access process between the user equipment and the base station. Since there is a time division duplex communication mode and a frequency division duplex communication mode between the user equipment and the base station, the two communication modes are respectively introduced in detail below.
  • Step S201 The base station generates a broadcast system message and sends it to each user equipment in the cell.
  • the channel resource index table stored by the base station and the user equipment is Table 1.
  • the same channel resource index table is used for time domain resource allocation and frequency domain resource allocation.
  • the base station will select an applicable current channel resource configuration parameter set according to the application scenario, for example, select the current channel resource configuration parameter set with a PRACH configuration index (PRACH Configuration Index) of 0 Channel resource configuration parameter set.
  • PRACH Configuration Index PRACH Configuration Index
  • the base station generates a broadcast system message.
  • the broadcast system message includes: PRACH Configuration Index (PRACH Configuration Index), and channel frequency domain offset (prach-FreqOffset).
  • PRACH Configuration Index PRACH Configuration Index
  • prach-FreqOffset channel frequency domain offset
  • Step S202 From the channel resource index table, determine a current channel resource configuration parameter set corresponding to the PRACH configuration index parameter, where the current channel resource configuration parameter set includes channel resource parameters belonging to ground equipment and channel resource parameters belonging to air Channel resource parameters of the device.
  • the current channel resource configuration parameter set includes channel resource parameters belonging to ground equipment (system frame number is "even”, subframe number is "1”) and channel resource parameters belonging to air equipment (system frame number is "odd", The subframe number is "1").
  • Step S203 Based on the channel resource parameter of the ground device and the channel frequency domain offset parameter, the current resource location belonging to the ground device is calculated.
  • S1 Use the channel frequency domain offset parameter as the frequency domain starting resource position of the ground equipment, and 6 resource blocks starting from the frequency domain starting resource position as the frequency domain resource position of the ground equipment.
  • the channel frequency domain offset parameter is used as the frequency domain starting resource position of the ground equipment, and then the 6 resource blocks starting from the frequency domain starting resource position are used as the frequency domain of the ground equipment. Domain resource location.
  • S2 Determine the system frame number and subframe number as the time domain resource location of the ground equipment.
  • S3 Determine the frequency domain resource location and the time domain resource location of the ground equipment as the current resource location of the ground equipment.
  • Step S204 Based on the channel resource parameter of the air device and the channel frequency domain offset parameter, the current resource location belonging to the air device is calculated.
  • S1 Determine the offset of the frequency domain starting resource position of the aerial equipment relative to the frequency domain starting resource position of the ground equipment.
  • the frequency domain positions of aerial equipment and ground equipment are different, so set Indicates the offset of the frequency domain starting resource position of the aerial equipment relative to the frequency domain starting resource position of the ground equipment.
  • S2 Determine the frequency domain starting resource position of the ground equipment and the sum of the offset as the frequency domain starting resource position of the aerial equipment, and 6 resource blocks starting from the frequency domain starting resource position As the frequency domain resource location of the aerial equipment.
  • set up Indicates the starting resource location of ground equipment; set Indicates the starting resource location of the air equipment.
  • the calculation method can refer to formula (1).
  • S3 Use the system frame number and subframe number as the time domain resource location of the air device.
  • S4 Determine the frequency domain resource location and time domain resource location of the air equipment as the current resource location of the air equipment.
  • Step S205 Use the ground equipment detection method to perform detection at the current channel resource position belonging to the ground equipment, and use the air equipment detection method to perform detection at the current channel resource position belonging to the air equipment.
  • the detection method of ground equipment is an existing detection method
  • the detection method of air equipment is a detection method of air equipment provided by the 3GPP protocol.
  • the current channel resource location of the ground equipment determined by the base station in step S203 is performed using the ground device detection algorithm.
  • the current channel resource location of the air device determined in step S204 is detected using the detection method of the air device.
  • Step S206 If an access signal of the user equipment is detected at the resource location belonging to the ground equipment, identify the user equipment as a ground equipment and access the communication system.
  • the base station detects the access signal of the user equipment at the resource location belonging to the ground equipment, it is undoubtedly determined that the equipment type of the user equipment is ground equipment, and the ground equipment is connected to the ground equipment in the access mode of the ground equipment. Base station, and use the processing method of ground equipment for subsequent processing.
  • Step S207 If an access signal of the user equipment is detected at the resource location belonging to the air equipment, identify the user equipment as an air equipment and access the communication system.
  • the base station detects the access signal of the user equipment at the resource position belonging to the air equipment, it is undoubtedly determined that the equipment type of the user equipment is the air equipment, and the air equipment is connected to the air equipment by the air equipment access method.
  • Base station and adopt the processing method of aerial equipment for subsequent processing.
  • Step S301 Receive the broadcast system message sent by the base station.
  • the user equipment receives the broadcast system message sent by the base station.
  • the broadcast system message includes: PRACH Configuration Index (PRACH Configuration Index) and channel frequency domain offset (prach-FreqOffset).
  • Step S302 Determine a resource location corresponding to the broadcast system message and the device type based on the broadcast system message and the device type of the user equipment.
  • the user equipment also stores a channel resource index table.
  • the stored table 1 (the content of Table 1 can be changed according to actual application scenarios, and this step is only an illustrative example).
  • the determining the resource location corresponding to the broadcast system message and the device type includes: determining the resource of the ground device corresponding to the broadcast system message Location.
  • the process of determining the resource location of the ground equipment can refer to the process of step S203, which is consistent with the process of determining the resource location of the ground equipment by the base station, and will not be repeated here.
  • the determining the resource location corresponding to the broadcast system message and the device type includes: determining the resource corresponding to the broadcast system message and belonging to the air device Location.
  • the process of determining the resource location of the ground equipment may refer to the process of step S204, which is the same as the process of determining the resource location of the air equipment by the base station, and will not be repeated here.
  • Step S303 Send an access signal to the resource location.
  • Another column in the resource index table of Table 1 is the preamble sequence format.
  • PRACH Configuration Index PRACH Configuration Index
  • the corresponding preamble sequence format in Table 1 is "0"
  • the user The device can generate an access signal in a format in which the preamble sequence is "0".
  • an access signal is sent according to the resource location determined in step S302, so that the base station can access the user equipment based on the access signal.
  • Step S401 The base station generates a broadcast system message and sends it to each user equipment in the cell.
  • the channel resource index table stored by the base station and the user equipment is Table 2 or Table 3.
  • Table 2 is used for time domain resource allocation
  • Table 3 is used for frequency domain resource allocation.
  • the base station will select an applicable current channel resource configuration parameter set according to the application scenario, for example, select the current channel resource configuration parameter set with a PRACH configuration index (PRACH Configuration Index) of 0 Channel resource configuration parameter set.
  • PRACH Configuration Index PRACH Configuration Index
  • the base station generates a broadcast system message.
  • the broadcast system message includes: PRACH Configuration Index (PRACH Configuration Index), and channel frequency domain offset (prach-FreqOffset).
  • PRACH Configuration Index PRACH Configuration Index
  • prach-FreqOffset channel frequency domain offset
  • Step S402 From the channel resource index table, determine the current channel resource configuration parameter set corresponding to the PRACH configuration index parameter; wherein, the current channel resource configuration parameter set includes the channel resource parameters belonging to ground equipment and those belonging to the air Channel resource parameters of the device.
  • the current channel resource configuration parameter set includes channel resource parameters belonging to ground equipment (quadruple (0,1,0,2)) and channel resource parameters belonging to air equipment (quadruple (0,1,0,1) )).
  • Step S403 Based on the channel resource parameter of the ground device and the channel frequency domain offset parameter, the current resource location belonging to the ground device is calculated.
  • the frequency domain starting resource position of the ground equipment is calculated according to a preset formula, and the 6 resource blocks starting from the frequency domain starting resource position are taken as The frequency domain resource location of the ground equipment.
  • the frequency domain starting resource position of the ground equipment is calculated by formula (3), and then the 6 resource blocks starting from the frequency domain starting resource position are used as the frequency domain resource position of the ground equipment.
  • System frame indicating the location of accessible resources, Indicate the first half frame or the second half frame of the accessible resource location, Indicates the index of the subframe where the location of the accessible resource is located after the special subframe, Respectively indicate whether the accessible resource location is all system frames, even frames or odd frames, Indicates whether the location of the accessible resource is the first half frame or the second half frame.
  • the time domain resource location of the ground equipment can be determined through the last three parameters in the quadruple.
  • the quadruple of the ground equipment is (0,1,0,2)
  • the following three "1", "0” and "2" are used to determine the time domain resource location.
  • S3 Determine the frequency domain resource location and the time domain resource location of the ground equipment as the current resource location of the ground equipment.
  • Step S404 Based on the channel resource parameter of the air device and the channel frequency domain offset parameter, the current resource location belonging to the air device is calculated.
  • the frequency domain start resource position of the air equipment is calculated according to the preset formula through the frequency domain resource index f RA and the channel frequency domain offset parameter, and the 6 resource blocks starting from the frequency domain start resource position are taken as The frequency domain resource location of the aerial equipment.
  • the frequency domain start resource position of the air equipment is calculated by formula (3), and then the 6 resource blocks starting from the frequency domain start resource position are used as the frequency domain resource position of the air equipment.
  • System frame indicating the location of accessible resources, Indicate the first half frame or the second half frame of the accessible resource location, Indicates the index of the subframe where the location of the accessible resource is located after the special subframe, Respectively indicate whether the accessible resource locations are all system frames, even-numbered frames or odd-numbered frames, Indicates whether the location of the accessible resource is the first half frame or the second half frame.
  • the time domain resource location of the air equipment can be determined through the last three parameters in the quadruple.
  • the quadruple of the air equipment is (0,1,0,1)
  • the following three "1", "0” and "1" are used to determine the time domain resource location.
  • S3 Determine the frequency domain resource location and the time domain resource location of the air equipment as the current resource location of the air equipment.
  • Step S405 Use the ground equipment detection method to perform detection at the current channel resource position belonging to the ground equipment, and use the air equipment detection method to perform detection at the current channel resource position belonging to the air equipment.
  • the detection method of ground equipment is an existing detection method
  • the detection method of air equipment is a detection method of air equipment provided by the 3GPP protocol.
  • the current channel resource location of the ground equipment determined by the base station in step S403 is performed using the ground device detection algorithm.
  • the current channel resource location of the air device determined in step S404 is detected using the detection method of the air device.
  • Step S406 If the access signal of the user equipment is detected at the resource location belonging to the ground equipment, identify the user equipment as a ground equipment and access the communication system.
  • the base station detects the access signal of the user equipment at the resource location belonging to the ground equipment, it is undoubtedly determined that the equipment type of the user equipment is ground equipment, and the ground equipment is connected to the ground equipment in the access mode of the ground equipment. Base station, and use the processing method of ground equipment for subsequent processing.
  • Step S407 If an access signal of the user equipment is detected at the resource location belonging to the air equipment, identify the user equipment as an air equipment and access the communication system.
  • the base station detects the access signal of the user equipment at the resource position belonging to the air equipment, it is undoubtedly determined that the equipment type of the user equipment is the air equipment, and the air equipment is connected to the air equipment by the air equipment access method.
  • Base station and adopt the processing method of aerial equipment for subsequent processing.
  • Step S501 Receive a broadcast system message sent by a base station.
  • the user equipment receives the broadcast system message sent by the base station.
  • the broadcast system message includes: PRACH Configuration Index (PRACH Configuration Index) and channel frequency domain offset (prach-FreqOffset).
  • Step S502 Determine a resource location corresponding to the broadcast system message and the device type based on the broadcast system message and the device type of the user equipment.
  • the user equipment also stores a channel resource index table.
  • the stored table 2 or table 3 (the content of table 2 or table 3 can be changed according to actual application scenarios. This step is only for illustration sexual examples).
  • the determining the resource location corresponding to the broadcast system message and the device type includes: determining the resource of the ground device corresponding to the broadcast system message Location.
  • the process of determining the resource location of the ground equipment may refer to the process of step S403, which is consistent with the process of determining the resource location of the ground equipment by the base station, and will not be repeated here.
  • the determining the resource location corresponding to the broadcast system message and the device type includes: determining the resource corresponding to the broadcast system message and belonging to the air device Location.
  • the process of determining the resource location of the ground equipment can refer to the process of step S404, which is the same as the process of determining the resource location of the air equipment by the base station, and will not be repeated here.
  • Step S503 Send an access signal to the resource location.
  • the access signal is sent according to the resource location determined in step S502, so that the base station can access the user equipment based on the access signal.
  • the user equipment can send an access signal at the resource location to which it belongs.
  • the base station may use a detection method suitable for ground equipment to detect the access signal at the resource location belonging to the ground equipment, and if it can be detected, it will access the user equipment and identify the equipment type as ground equipment.
  • the base station can use a detection method suitable for aerial equipment to detect the access signal at the resource location belonging to the aerial equipment, and if it can be detected, it will access the user equipment and identify the equipment type as an aerial equipment.
  • this application can realize random access of ground equipment and aerial equipment in an existing communication system, and can identify the equipment type of user equipment at the same time of access, so that a single cell can support both ground equipment and support The purpose of aerial equipment.
  • the function described in the method of this embodiment is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium readable by a computing device.
  • a computing device which may be a personal computer, a server, a mobile computing device, or a network device, etc.
  • a computing device which may be a personal computer, a server, a mobile computing device, or a network device, etc.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks and other media that can store program codes. .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un système d'accès aléatoire. Une station de base stocke une table d'indices de ressources de canal. La table d'indices de ressources de canal comporte un emplacement de ressources de canal appartenant à un équipement au sol et un emplacement de ressources de canal appartenant à un équipement aérien, et l'emplacement de ressources de canal appartenant à l'équipement au sol et l'emplacement de ressources de canal appartenant à l'équipement aérien ne se chevauchent pas. Le procédé comporte les étapes consistant à: envoyer un message de système de diffusion à un équipement d'utilisateur dans une cellule, utiliser un procédé de détection d'équipement au sol pour effectuer une détection dans un emplacement de ressources de canal appartenant à un équipement au sol, et utiliser un procédé de détection d'équipement aérien pour effectuer une détection dans un emplacement de ressources de canal appartenant à un équipement aérien; si un signal d'accès de l'équipement d'utilisateur est détecté dans l'emplacement de ressources appartenant à l'équipement au sol, identifier l'équipement d'utilisateur en question en tant qu'équipement au sol, et connecter celui-ci à un système de communication; et si un signal d'accès de l'équipement d'utilisateur est détecté dans l'emplacement de ressources appartenant à l'équipement aérien, identifier l'équipement d'utilisateur en question en tant qu'équipement aérien, et connecter celui-ci au système de communication. La présente invention réalise l'accès à l'équipement aérien et à l'équipement au sol, et identifie le type d'équipement.
PCT/CN2020/080123 2020-03-19 2020-03-19 Procédé et système d'accès aléatoire WO2021184278A1 (fr)

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CN110199566A (zh) * 2017-02-13 2019-09-03 高通股份有限公司 无人机用户设备指示
CN110447270A (zh) * 2017-03-23 2019-11-12 交互数字专利控股公司 针对飞行器的基于高度路径损耗的功率控制
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