Random access method and device

Abstract

The invention provides a random access method and device, and relates to the technical field of communication. The method comprises the steps that a service request is received, the service request is used for requesting to carry first indication information and second indication information, the first indication information is used for indicating a triggering reason, and the second indication information is used for indicating terminal equipment to be subjected to random access; obtaining a target success rate and a target data volume; if the target success rate is larger than the threshold success rate and the target data volume is smaller than or equal to the threshold data volume, an initial trigger message carrying third indication information is sent to the terminal device to be subjected to random access, and the third indication information is used for indicating random access through two-step random access. The method and the device are used for reducing the time delay of the random access in the A-IoT scene while ensuring the reliability of the random access in the A-IoT scene.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a random access method and device. Background Art

[0002] Passive Internet of Things (PIoT) is a battery-free IoT technology that uses a reader to power passive terminal devices to achieve communication. As PIoT technology continues to evolve, Ambient IoT (A-IoT) has been proposed in related technologies, and base stations are gradually able to support A-IoT.

[0003] In the A-IoT scenario, the terminal device (Device) usually tries to establish a connection with the base station through random access. Random access can be divided into 2-step random access and 4-step random access according to the number of access steps. Since 2-step random access only requires two signaling interactions to complete the random access process, the steps of signaling interaction are relatively reduced. Therefore, the access delay of 2-step random access is shorter, and the random access process can be completed faster. However, due to the simplified steps, the probability of errors in complex wireless environments is relatively high, and the reliability is low. 4-step random access requires four signaling interactions to complete the random access process. After multiple signaling interactions, resource allocation and access control can be completed more accurately. The reliability in complex environments is higher, but more signaling interaction steps will increase the overall access time and the access delay is longer. Therefore, how to reduce the delay of random access in A-IoT scenarios while ensuring the reliability of random access in A-IoT scenarios. Summary of the invention

[0004] The exemplary embodiments of the present application provide a random access method and apparatus for reducing the delay of random access in an A-IoT scenario while ensuring the reliability of random access in the A-IoT scenario.

[0005] In a first aspect, the present application provides a random access method, which is applied to a network access device, and the method includes:

[0006] Receive a service request sent by a core network, where the service request is used to request to carry first indication information and second indication information, where the first indication information is used to indicate a triggering cause, and the second indication information is used to indicate a terminal device to be randomly accessed;

[0007] Obtaining a target success rate and a target data volume; the target success rate is a success rate of sending a random access preamble message to a terminal device within a coverage area of ​​the network access device, and the target data volume is a data volume of the random access preamble message corresponding to a triggering cause indicated by the first indication information;

[0008] If the target success rate is greater than the threshold success rate, and the target data volume is less than or equal to the threshold data volume, an initial trigger message carrying third indication information is sent to the terminal device to be randomly accessed, and the third indication information is used to indicate random access through 2-step random access.

[0009] In a second aspect, the present application provides a network access device, including:

[0010] A receiving unit, configured to receive a service request sent by a core network, wherein the service request is used to request to carry first indication information and second indication information, wherein the first indication information is used to indicate a triggering cause, and the second indication information is used to indicate a terminal device to be randomly accessed;

[0011] a processing unit, configured to obtain a target success rate and a target data volume; the target success rate is a success rate of sending a random access preamble message to a terminal device within a coverage area of ​​the network access device, and the target data volume is a data volume of the random access preamble message corresponding to a triggering cause indicated by the first indication information;

[0012] A sending unit is used to send an initial trigger message carrying third indication information to a terminal device to be randomly accessed if the target success rate is greater than a threshold success rate and the target data volume is less than or equal to a threshold data volume, wherein the third indication information is used to indicate random access through two-step random access.

[0013] In a third aspect, the present application provides an electronic device, comprising: a memory and a processor, wherein the memory stores a computer program, and the processor is configured to implement the random access method described in the first aspect when executing the computer program.

[0014] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a computing device, the computing device implements the random access method described in the first aspect.

[0015] In a fifth aspect, the present application provides a chip comprising a processor and a memory, wherein the memory is used to store programs or instructions that can be run on the processor, and the processor is used to execute the programs or instructions to enable the random access method described in the first aspect.

[0016] In a sixth aspect, the present application provides a computer program product. When the computer program product is executed on a computer, the computer implements the random access method described in the first aspect.

[0017] It can be seen from the above technical scheme that the random access method provided by the present application first obtains the success rate of the random access preamble message sent by the terminal device within the coverage area of ​​the network access device and the data volume of the random access preamble message corresponding to the trigger reason indicated by the first indication information when the network access device receives the service request carrying the first indication information and the second indication information sent by the core network. When the success rate is greater than the threshold success rate and the data volume is less than or equal to the threshold data volume, an initial trigger message carrying the information for indicating random access through two-step random access is sent to the terminal device to be randomly accessed. Because when the success rate of terminal devices in the coverage area of ​​the network access device sending random access preamble messages is greater than the threshold success rate, and the data volume of the random access preamble messages is less than or equal to the threshold data volume, the terminal devices are more likely to successfully perform random access, and the access delay of two-step random access is shorter. Therefore, when the success rate of terminal devices in the coverage area of ​​the network access device sending random access preamble messages is greater than the threshold success rate, and the data volume of the random access preamble messages is less than or equal to the threshold data volume, sending an initial trigger message carrying a message indicating random access through two-step random access to the terminal devices to be randomly accessed can reduce the delay of random access in the A-IoT scenario while ensuring the reliability of random access in the A-IoT scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A topological schematic diagram of a communication system provided by some embodiments is shown;

[0019] Figure 2 A flowchart showing the steps of a random access method in some embodiments is shown;

[0020] Figure 3 A flowchart showing the steps of the random access method in some other embodiments is shown;

[0021] Figure 4 A schematic diagram of time domain resource allocation provided by some embodiments is shown;

[0022] Figure 5 A schematic diagram of frequency domain resource allocation provided by some embodiments is shown;

[0023] Figure 6 A schematic diagram showing time domain resource allocation of first communication resources provided by some embodiments is shown;

[0024] Figure 7 A schematic diagram showing frequency domain resource allocation of first communication resources provided by some embodiments is shown;

[0025] Figure 8 An interactive flow chart of a random access method provided in some embodiments is shown;

[0026] Fig. 9 An interactive flow chart of a random access method provided in some embodiments is shown;

[0027] Fig.10 An interactive flow chart of a random access method provided in some other embodiments is shown;

[0028] Fig.11 A schematic diagram showing time domain resource allocation of a second communication resource provided by some embodiments is shown;

[0029] Fig.12 A schematic diagram showing frequency domain resource allocation of second communication resources provided by some embodiments is shown;

[0030] Fig.13 An interactive flow chart of a random access method provided in some other embodiments is shown;

[0031] Fig.14 An interactive flow chart of a random access method provided in some other embodiments is shown;

[0032] Fig.15 A schematic diagram of the structure of a network access device in some embodiments of the present application is shown;

[0033] Fig.16 Schematic diagrams of the hardware structure of electronic devices in some embodiments of the present application are shown. DETAILED DESCRIPTION

[0034] It should be noted that the brief description of the terms in this application is only for the convenience of understanding the implementation methods described below. In order to make the purpose and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only part of the embodiments of this application, not all of the embodiments.

[0035] The following first describes the communication system provided in the embodiments of the present application.

[0036] Figure 1 A topological diagram of a communication system provided in some embodiments of the present application. Figure 1As shown, the communication system includes: a core network 11, a network access device 12 and a terminal device 13. Among them, a data transmission link is established between the core network 11 and the network access device 12. The core network 11 can send a service request to the network access device 12 through the data transmission link, and the network access device 12 can send an initial user equipment (User Equipment, UE) message to the core network 11 through the data transmission link after the terminal device 13 successfully accesses randomly. An A-IoT uplink and an A-IoT downlink can be established between the terminal device 13 and the network access device 12 by random access. After the A-IoT uplink and the A-IoT downlink are established between the terminal device 13 and the network access device 12 by random access, the terminal device 13 can send uplink A-IoT information to the network access device 12 through the A-IoT uplink, and receive A-IoT downlink information sent by the network access device 12 through the A-IoT downlink. Correspondingly, the network access device 12 can receive uplink A-IoT information sent by the terminal device 13 through the A-IoT uplink, and can also send A-IoT downlink information to the terminal device 13 through the A-IoT downlink.

[0037] In addition, a New Radio (NR) uplink and an NR downlink are established between the network access device 12 and the terminal device 13. The terminal device 13 can send uplink NR information to the network access device through the NR uplink, and receive NR downlink information sent by the network access device through the NR downlink. Correspondingly, the network access device 12 can receive uplink NR information sent by the terminal device 13 through the NR uplink, and can also send NR downlink information to the terminal device 13 through the NR downlink.

[0038] In addition, the network access device 12 can be a long term evolution (LTE), a long term evolution advanced (LTE-A), an evolutionary base station (eNB or eNodeB), a 5G network, a base station in a future communication system, or a reader integrated in a base station. The base station can include various macro base stations, micro base stations, home base stations, wireless remotes, reconfigurable intelligent surfaces (RIS), routers, wireless fidelity (WIFI) devices, etc.

[0039] Furthermore, the terminal device 13 can be a device with wireless transceiver function, which can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.). The terminal device can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, Ambient-IoT device, etc. The embodiments of the present application do not limit the application scenarios. The terminal may also be sometimes referred to as a terminal device (User Equipment, UE), an access terminal, a UE unit, a UE station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a UE terminal, a wireless communication device, a UE agent or a UE device, etc., and the embodiments of the present application are not limited to this. As an example, Figure 1 It is taken as an example that the terminal device 13 is an A-IoT device.

[0040] In addition, the communication system may also include: intermediate nodes and / or auxiliary nodes. An A-IoT uplink and an A-IoT uplink and downlink are established between the network access device and the terminal device through the intermediate nodes and / or auxiliary nodes. The terminal device sends uplink A-IoT information to the network access device through the intermediate nodes and / or auxiliary nodes, and receives A-IoT downlink information sent by the network access device through the intermediate nodes and / or auxiliary nodes. Correspondingly, the network access device can receive uplink A-IoT information sent by the terminal device through the intermediate nodes and / or auxiliary nodes, and send A-IoT downlink information to the terminal device through the intermediate nodes and / or auxiliary nodes.

[0041] It should be noted that Figure 1 A possible communication system for the random access method provided in the present application, but the embodiments of the present application are not limited to this. The communication system to which the random access method provided in the embodiments of the present application is applied may also include more communication devices, and the embodiments of the present application are not limited to this. The communication system can support the random access method provided based on the embodiments of the present application.

[0042] The present application provides a random access method, which is applied to a network access device, such as a base station (gNB) or a reader of a base station. Figure 2 A schematic diagram of the random access method provided in an embodiment of the present application is shown. Figure 2 As shown, the random access method may include:

[0043] Receive service requests sent by the core network.

[0044] The service request is used to request to carry first indication information and second indication information, the first indication information is used to indicate a triggering cause, and the second indication information is used to indicate a terminal device to be randomly accessed.

[0045] Furthermore, the triggering reason indicated by the first indication information may be: inventory or command.

[0046] Furthermore, the second indication information indicates that the number of terminal devices to be randomly accessed is 1.

[0047] Of course, the number of terminal devices to be randomly accessed indicated by the second indication information may also be multiple (greater than or equal to 2).

[0048] Furthermore, the second indication information may indicate the terminal devices to be randomly accessed in a manner that: the terminal devices to be randomly accessed are indicated by using device identification codes (Identification, ID) of the terminal devices to be randomly accessed.

[0049] Alternatively, the second indication information may indicate the terminal devices to be randomly accessed by indicating the terminal devices to be randomly accessed through the ID of the device group to which each terminal device to be randomly accessed belongs, the area to which each terminal device to be randomly accessed belongs, etc.

[0050] Get the target success rate and target data volume.

[0051] Among them, the target success rate is the success rate of sending random access preamble messages (Random Access Preamble Message, Msg1) by terminal devices within the coverage area of ​​the network access device, and the target data volume is the data volume of the random access preamble message corresponding to the triggering reason indicated by the first indication information.

[0052] During the 2-step random access and 4-step random access processes, the initial trigger message sent by the network access device to the terminal device is called Msg0, and the random access preamble message sent by the terminal device to the network access device in response to the initial trigger message (Msg0) is called Msg1. Therefore, the target success rate is the sending success rate of Msg1 within the coverage area of ​​the network access device, and the target data volume is the data volume of Msg1 corresponding to the trigger cause indicated by the first indication information.

[0053] In some embodiments, the network access device may save the correspondence between the trigger cause and the data volume of the random access preamble message, and obtain the data volume of the random access preamble message corresponding to the trigger cause indicated by the first indication information based on the correspondence between the trigger cause and the data volume of the random access preamble message.

[0054] Exemplarily, the correspondence between the triggering cause and the data amount of the random access preamble message may be shown in the following Table 1:

[0055] Table 1

[0056]

[0057] It is determined whether the target success rate is greater than a threshold success rate and whether the target data volume is less than or equal to a threshold data volume.

[0058] Among them, the threshold success rate can be set according to actual needs, for example, the threshold success rate can be set to 80%, 90%, etc., and the threshold data volume can be set according to actual needs, for example, the threshold data volume can be set to 96 bits, 100 bits, etc.

[0059] In the above steps, if the target success rate is greater than the threshold success rate and the target data volume is less than or equal to the threshold data volume, the following steps are performed: an initial trigger message carrying third indication information is sent to the terminal device to be randomly accessed.

[0060] The third indication information is used to indicate random access through 2-step random access.

[0061] That is, if the target success rate is greater than the threshold success rate and the target data volume is less than or equal to the threshold data volume, the terminal device is notified to perform random access through 2-step random access.

[0062] The random access method provided by the present application first obtains the success rate of random access preamble messages sent by terminal devices within the coverage area of ​​the network access device and the data volume of the random access preamble messages corresponding to the triggering cause indicated by the first indication information when the network access device receives a service request carrying first indication information and second indication information sent by the core network, and when the target success rate is greater than the threshold success rate and the target data volume is less than or equal to the threshold data volume, sends an initial trigger message carrying the instruction to perform random access through two-step random access to the terminal device to be randomly accessed. Because when the success rate of terminal devices in the coverage area of ​​the network access device sending random access preamble messages is greater than the threshold success rate, and the data volume of the random access preamble messages is less than or equal to the threshold data volume, the terminal devices are more likely to successfully perform random access, and the access delay of two-step random access is shorter. Therefore, when the success rate of terminal devices in the coverage area of ​​the network access device sending random access preamble messages is greater than the threshold success rate, and the data volume of the random access preamble messages is less than or equal to the threshold data volume, sending an initial trigger message carrying a message indicating random access through two-step random access to the terminal devices to be randomly accessed can reduce the delay of random access in the A-IoT scenario while ensuring the reliability of random access in the A-IoT scenario.

[0063] In the above steps, if the target success rate is less than or equal to the threshold success rate, and / or the target data volume is greater than the threshold data volume, the following steps are performed: an initial trigger message carrying fourth indication information is sent to the terminal device to be randomly accessed.

[0064] The fourth indication information is used to indicate random access through 4-step random access.

[0065] That is, excluding the case where the target success rate is greater than the threshold success rate and the target data volume is less than or equal to the threshold data volume, the network access device will notify the terminal device to perform random access through 4-step random access in the following three cases:

[0066] Case 1: The target success rate is less than or equal to the threshold success rate, and the target data volume is less than or equal to the threshold data volume;

[0067] Case 2: The target success rate is greater than the threshold success rate, and the target data volume is greater than the threshold data volume;

[0068] Case 3: The target success rate is less than or equal to the threshold success rate, and the target data volume is greater than the threshold data volume.

[0069] The random access method provided by the present application first obtains the success rate of random access preamble messages sent by terminal devices within the coverage area of ​​the network access device and the data volume of the random access preamble messages corresponding to the triggering cause indicated by the first indication information when the network access device receives a service request carrying first indication information and second indication information sent by the core network, and when the target success rate is less than or equal to the threshold success rate and / or the target data volume is greater than the threshold data volume, sends an initial trigger message carrying the instruction to perform random access through 4-step random access to the terminal device to be randomly accessed. When the success rate of random access preamble messages sent by terminal devices within the coverage area of ​​the network access device is less than or equal to the threshold success rate, and / or the data volume of the random access preamble messages is greater than the threshold data volume, the possibility of random access failure of the terminal device is relatively high, and the reliability of 4-step random access is relatively high in complex environments. Therefore, when the success rate of random access preamble messages sent by terminal devices within the coverage area of ​​the network access device is less than or equal to the threshold success rate, and / or the data volume of the random access preamble messages is greater than the threshold data volume, sending an initial trigger message carrying a message indicating random access through 4-step random access to the terminal devices to be randomly accessed can improve the reliability of random access in the A-IoT scenario.

[0070] Reference Figure 3 As shown, the random access method provided above also includes: before sending an initial trigger message carrying the third indication information or the fourth indication information to the terminal device to be randomly accessed, performing the following steps:

[0071] Determine whether the number of terminal devices to be randomly accessed is one.

[0072] That is, it is determined whether the service request is a request for random access to one terminal device or for anytime access to multiple terminal devices (two or more).

[0073] If the data of the terminal device to be randomly accessed is one, fifth indication information is added to the initial trigger message. The fifth indication information is used to indicate that random access is performed through contention-free random access (CFRA).

[0074] If the number of terminal devices to be randomly accessed exceeds one (more than one), it is determined whether the service request carries a device identification of each terminal device to be randomly accessed.

[0075] That is, when the number of terminal devices to be randomly accessed exceeds one, it is determined whether the second indication information indicates the terminal devices to be randomly accessed through the device identifiers of the terminal devices to be randomly accessed.

[0076] In the above steps, if the number of terminal devices to be randomly accessed is one, or the number of terminal devices to be randomly accessed is more than one, but the service request carries the device identification of each terminal device to be randomly accessed, then the following steps are performed: add the fifth indication information in the initial trigger message.

[0077] The fifth indication information is used to indicate random access through contention-free random access (Contention Free Random Access, CFRA).

[0078] When the target success rate is greater than the threshold success rate and the target data volume is less than or equal to the threshold data volume, after the fifth indication information is added to the initial trigger message, the initial trigger message sent by the network access device to the terminal device carries the third indication information and the fifth indication information, and the third indication information is used to indicate random access through 2-step random access, and the fifth indication information is used to indicate random access through CFRA. Therefore, the initial trigger message is used to instruct the terminal device to perform random access through 2-step contention-free random access.

[0079] When the target success rate is less than or equal to the threshold success rate, and / or the target data volume is greater than the threshold data volume, after the fifth indication information is added to the initial trigger message, the initial trigger message sent by the network access device to the terminal device carries the fourth indication information and the fifth indication information, and the fourth indication information is used to indicate random access through 4-step random access, and the fifth indication information is used to indicate random access through CFRA. Therefore, the initial trigger message is used to instruct the terminal device to perform random access through 4-step contention-free random access.

[0080] The above-mentioned random access method, when the number of terminal devices to be randomly accessed is one, or the number of terminal devices to be randomly accessed is more than one but the service request carries the device identification of each terminal device to be randomly accessed, will add fifth indication information for indicating random access based on CFRA in the initial trigger message. Therefore, the above-mentioned random access method can effectively reduce the collision probability of terminal devices when performing random access when the number of terminal devices to be randomly accessed is one, or the number of terminal devices to be randomly accessed is more than one but the service request carries the device identification of each terminal device to be randomly accessed.

[0081] In the above steps, if the number of terminal devices to be randomly accessed is more than one (greater than one, two or more), and the service request does not carry the device identification of each terminal device to be randomly accessed, then the following steps are performed: add the sixth indication information in the initial trigger message.

[0082] The sixth indication information is used to indicate random access through contention-based random access (Contention Based Random Access, CBRA).

[0083] When the target success rate is greater than the threshold success rate and the target data volume is less than or equal to the threshold data volume, after the sixth indication information is added to the initial trigger message, the initial trigger message sent by the network access device to the terminal device carries the third indication information and the sixth indication information, and the third indication information is used to indicate random access through 2-step random access, and the sixth indication information is used to indicate random access through CBRA. Therefore, the initial trigger message is used to instruct the terminal device to perform random access through 2-step contention-based random access.

[0084] When the target success rate is less than or equal to the threshold success rate, and / or the target data volume is greater than the threshold data volume, after the sixth indication information is added to the initial trigger message, the initial trigger message sent by the network access device to the terminal device carries the fourth indication information and the sixth indication information, and the fourth indication information is used to indicate random access through 4-step random access, and the sixth indication information is used to indicate random access through CBRA. Therefore, the initial trigger message is used to instruct the terminal device to perform random access through 4-step contention-based random access.

[0085] In addition, when the sixth indication information is added to the initial trigger message, a slot count parameter (Slot-Count Parameter, Q) may also be added to the initial trigger message.

[0086] Radio frequency identification (RFID) technology is a contactless automatic identification technology. RFID systems usually include a reader (such as the aforementioned network access device) and a tag (such as the aforementioned terminal device). The reader can send a selection signal to select one or more tags for inventory. The reader can also send a query signal to the tag to initiate an inventory cycle. The query signal can include a time slot count parameter. An inventory cycle can include 2 Q time slots, the reader can determine whether there is a tag in each time slot. When the tag receives the query signal, it can generate a value in the range [0, 2 Q -1] as the time slot counter. Each time a query repeat (QueryRep) signaling is received, the time slot counter is reduced by 1. When the time slot counter is equal to 0, the tag can send a random number. If the reader successfully receives the random number sent by the tag, the reader can send a confirmation message to the tag. When the reader finishes the inventory of a tag, it can also send a query repeat signaling to trigger the inventory of the next tag.

[0087] Further, when the initial trigger message is used to instruct the terminal device to perform random access through two-step competition-free random access, before sending the initial trigger message to the terminal device to perform random access, the method also includes: adding configuration information of dedicated resources for sending random access preamble messages in the initial trigger message.

[0088] That is, when the random access is instructed to be performed through the 2-step contention-free random access, configuration information of dedicated resources for sending the random access preamble message (Msg1) of the 2-step random access is also added to the initial trigger message.

[0089] Furthermore, the configuration information of the dedicated resources is time domain resource configuration information based on Time Division Multiple Access (TDMA).

[0090] For example, refer to Figure 4 As shown, Figure 4 The following is a schematic diagram of CFRA TDMA time domain resource allocation based on A-IoT in the above method. Figure 4 As shown, in TDMA mode, frequency domain resources are divided into non-overlapping A-IoT subchannel 41, first NR bandwidth 42, second NR bandwidth 43, first guard band 44 and second guard band 45. A-IoT subchannel 41 is between the first NR bandwidth 42 and the second NR bandwidth 43. The first guard band 44 is set between the A-IoT subchannel 41 and the first NR bandwidth 42. The second guard band 45 is set between the A-IoT subchannel 41 and the second NR bandwidth 43. The function of the first guard band 44 and the second guard band 45 is to prevent interference between the A-IoT service and the NR service. The frequency domain width of the first guard band 44 and the second guard band 45 can be 1 to 12 subcarriers, and the frequency domain width of the A-IoT subchannel 41 can be 1 to 12 subcarriers, or 2 to 4 resource blocks. Access opportunity #N includes multiple time slots ( Figure 4 However, due to TDMA time domain resource allocation, only one terminal device can be accessed during access opportunity #N, and other devices can only be accessed during the next access opportunity. Therefore, a resource block (RB) or multiple consecutive RBs in access opportunity #N can be configured as dedicated resources. Figure 4 The example of configuring a resource block in access opportunity #N as an A-IoT contention-free resource (a dedicated resource for sending a random access preamble message) is shown.

[0091] In some embodiments, the configuration information of the dedicated resources is frequency domain resource configuration information based on Frequency Division Multiple Access (TDMA).

[0092] For example, refer to Figure 5 As shown, Figure 5 The following is a schematic diagram of the CFRA FDMA time domain resource allocation based on A-IoT in the above method. Figure 5 As shown, in FDMA mode, frequency domain resources are divided into non-overlapping first A-IoT subchannel 51, second A-IoT subchannel 52, excitation source carrier 53, first NR bandwidth 54, first guard band 55, second NR bandwidth 56 and second guard band 57. The first A-IoT subchannel 51 and the second A-IoT subchannel 52 are respectively located on both sides of the excitation source carrier 53. The first guard band 55 is arranged between the first A-IoT subchannel 51 and the first NR bandwidth 54, and the second guard band 57 is arranged between the second A-IoT subchannel 52 and the second NR bandwidth 56. The function of the first guard band 55 and the second guard band 57 is to prevent interference between the A-IoT service and the NR service. The frequency domain width of the first guard band 55 and the second guard band 57 can be 1 to 12 subcarriers, and the frequency domain width of the first A-IoT subchannel 51 and the second A-IoT subchannel 52 can be 1 to 12 subcarriers, or 2 to 4 resource blocks. Access opportunity #N includes multiple time slots ( Figure 5 In the figure, the example in which access opportunity #N includes 5 time slots is still taken, one time slot includes two A-IoT sub-channels, and the bandwidth of each A-IoT sub-channel may be one RB or multiple RBs. Figure 5 In the figure, it is taken as an example that two A-IoT devices can be connected at the same time in one access opportunity N.

[0093] In some embodiments, when the initial trigger message is used to instruct a terminal device to perform random access through two-step contention-based random access, before sending the initial trigger message to the terminal device to perform random access, the method also includes: adding configuration information of public resources for sending a random access preamble message in the initial trigger message.

[0094] The configuration information of the public resources may be time domain resource configuration information based on TDMA.

[0095] The time domain resource configuration based on TDMA can refer to Figure 4 To avoid repetition, it will not be described here.

[0096] In addition, the configuration information of the common resources may also be frequency domain resource configuration information based on FDMA.

[0097] Frequency domain resource configuration based on FDMA can refer to Figure 5 To avoid repetition, it will not be described here.

[0098] In addition, when the initial trigger message is used to instruct the terminal device to perform random access through 4-step competition-free random access, before sending the initial trigger message to the terminal device to perform random access, the method also includes: adding configuration information of the first communication resource used to send the random access preamble message in the initial trigger message.

[0099] Furthermore, the configuration information of the first communication resource is time domain resource configuration information based on time division multiple access (Time Division Multiple Access, TDMA), including: a time domain offset of an access opportunity and a time domain length of an access opportunity.

[0100] Among them, the time domain offset of the access opportunity is used to indicate the number of orthogonal frequency division multiplexing (OFDM) symbols from the starting position of the access opportunity to the starting position of the uplink time slot to which the access opportunity belongs, and the time domain length of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the end position of the access opportunity.

[0101] For example, refer to Figure 6 As shown, Figure 6 This is a schematic diagram of TDMA-based time domain resource allocation for the first communication resource in the random access method. First, the number of uplink time slots for a round of access can be determined as N, starting from the downlink time slot where the terminal device receives the initial trigger message (the downlink time slot where the network access device sends the initial trigger message + time deviation). Secondly, the time domain symbol resources of each uplink time slot in a round of access, each access opportunity of the uplink time slot is represented by two parameters: the time domain offset of the access opportunity (Toffset_symb) and the time domain length of the access opportunity (Toccasion_symb). Among them, the time domain offset of the access opportunity is used to indicate the number of orthogonal frequency division multiplexing OFDM symbols from the starting position of the access opportunity to the starting position of the uplink time slot to which the access opportunity belongs, and the time domain length of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the end position of the access opportunity. Figure 6 In the figure, an uplink time slot has two access opportunities: access opportunity 61 and access opportunity 62. The time domain offset of access opportunity 61 is a, and the time domain length of access opportunity 61 is b. The time domain offset of access opportunity 62 is c, and the time domain length of access opportunity 62 is d. Therefore, the parameters of access opportunity 61 are (a, b), and the parameters of access opportunity 62 are (c, d).

[0102] Furthermore, the configuration information of the first communication resource is frequency domain resource configuration information based on frequency division multiple access (FDMA), including: a time domain offset of an access opportunity, a time domain length of an access opportunity, and a frequency domain resource of an access opportunity.

[0103] Among them, the time domain offset of the access opportunity is used to indicate the number of orthogonal frequency division multiplexing OFDM symbols from the starting position of the access opportunity to the starting position of the uplink time slot to which the access opportunity belongs, and the time domain length of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the end position of the access opportunity.

[0104] Among them, the time domain offset of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the starting position of the uplink time slot to which the access opportunity belongs, and the time domain length of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the end position of the access opportunity.

[0105] For example, refer to Figure 7 As shown, Figure 7 This is a schematic diagram of the FDMA frequency domain resource allocation for the first communication resource in the random access method. First, the number of uplink time slots for a round of access can be determined as N, starting from the downlink time slot where the terminal device receives the initial trigger message (the downlink time slot where the network access device sends the initial trigger message + time deviation). Secondly, the time domain symbol resources of each uplink time slot in a round of access, each access opportunity of the uplink time slot can be represented by three parameters: the time domain offset of the access opportunity (Toffset_symb), the time domain length of the access opportunity (Toccasion_symb), and the frequency domain resources of the access opportunity. Among them, the time domain offset of the access opportunity is used to indicate the number of orthogonal frequency division multiplexing OFDM symbols from the starting position of the access opportunity to the starting position of the uplink time slot to which the access opportunity belongs, and the time domain length of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the end position of the access opportunity. Figure 7 In the figure, a time slot has two access opportunities: access opportunity 71 and access opportunity 72 as an example, the time domain offsets of access opportunity 71 and access opportunity 72 are both A, and the time domain lengths of access opportunity 71 and access opportunity 72 are both B. That is, there are two frequency domain access opportunities at the same time domain access opportunity: the frequency domain resources of access opportunity 71 and access opportunity 72 are 1 to n resource blocks (RB).

[0106] Furthermore, the random access method provided above also includes: before sending the initial trigger message to the terminal device to be randomly accessed, adding second indication information to the initial trigger message. Sending the initial trigger message to the terminal device to be randomly accessed includes: broadcasting the initial trigger message carrying the second indication information.

[0107] Second indication information for indicating the terminal device to be randomly accessed is added to the initial trigger message, and the initial trigger message is broadcast. Therefore, the terminal device receiving the initial trigger message in the coverage area can determine whether it is the terminal device to be randomly accessed based on the second indication information, and then determine whether to send a random access preamble message to the network access device in response to the initial trigger message.

[0108] The random access method may further include:

[0109] After sending an initial trigger message carrying third indication information to a terminal device to be randomly accessed, receiving the random access preamble message sent by the target terminal device; wherein the target terminal device is any terminal device to be randomly accessed, and the random access preamble message carries a device permanent identifier of the target terminal device;

[0110] Sending a random access response message to the target terminal device, where the random access response message carries a confirmation of the device permanent identifier;

[0111] Send an initial user equipment UE message corresponding to the target terminal device to the core network.

[0112] In addition, the network access device accepts a random access preamble message sent by the target terminal device according to a random access opportunity through a public resource for sending a random access preamble message, wherein the random access opportunity includes: generating a random number based on a time slot count parameter as a random access opportunity, and using the random number as an initial value of an access counter, and when the value of the access counter is 0, sending a random access preamble message to the network access device through the public resource for sending a random access preamble message.

[0113] In addition, the random access preamble message also carries a temporary equipment identifier (Temporary Equipment Identifier Code, TEIC), that is, the random access preamble message carries the EPC and TEIC of the target terminal device.

[0114] The data volume of the device permanent identifier is 94 bits, and the data volume of the device temporary identifier is 16 bits, which are carried in the random access preamble message. Carrying the device temporary identifier in the random access preamble message can use the device temporary identifier instead of the device permanent identifier in the subsequent data transmission process, thereby reducing the amount of data to be transmitted and improving data transmission efficiency. In addition, the random access response message may also carry the aforementioned device temporary identifier and the aforementioned device permanent identifier.

[0115] In addition, the random access response message also carries the device index configured by the network access device for the target terminal device. That is, the network access device configures a device index for the newly discovered terminal device, thereby improving the security of communication.

[0116] The present application also provides a random access method, referring to Figure 8 As shown, the random access method includes:

[0117] S801. The core network sends a service request to a network access device.

[0118] Correspondingly, the network access device receives the service request sent by the core network.

[0119] The service request is used to request to carry first indication information and second indication information, the first indication information is used to indicate a triggering cause, and the second indication information is used to indicate a terminal device to be randomly accessed.

[0120] S802: The network access device obtains a target success rate and a target data volume.

[0121] Among them, the target success rate is the success rate of sending random access preamble messages to terminal devices within the coverage area of ​​the network access device, and the target data volume is the data volume of the random access preamble message corresponding to the triggering reason indicated by the first indication information.

[0122] S803: The network access device determines whether to select 2-step random access or 4-step random access for random access according to the target success rate and the target data volume.

[0123] The implementation method of determining whether to select 2-step random access or 4-step random access for random access according to the target success rate and the target data volume can refer to the above method. Specifically: if the target success rate is greater than the threshold success rate and the target data volume is less than or equal to the threshold data volume, it is determined to perform random access through 2-step random access; if the target success rate is less than or equal to the threshold success rate, and / or the target data volume is greater than the threshold data volume, it is determined to perform random access through 4-step random access.

[0124] S804: The network access device determines whether to perform random access through CFRA or CBRA according to the number of terminal devices to be randomly accessed and whether the service request carries a device identification of each terminal device to be randomly accessed.

[0125] The random access method shown above can be used to determine whether random access is performed through CFRA or CBRA according to the number of terminal devices to be randomly accessed and whether the service request carries the device identification of each terminal device to be randomly accessed. Specifically, if the number of terminal devices to be randomly accessed exceeds one, and the service request does not carry the device identification of each terminal device to be randomly accessed, it is determined that random access is performed through CBRA; if the number of terminal devices to be randomly accessed is one, or the number of terminal devices to be randomly accessed exceeds one, but the service request carries the device identification of each terminal device to be randomly accessed, it is determined that random access is performed through CFRA.

[0126] If it is determined through steps S803 and S804 to adopt two-step random access and contention-free random access, the following step S805 is executed:

[0127] S805. The network access device broadcasts initial access information including the second indication information, the third indication information, the sixth indication information, a time slot count parameter, and configuration information of a public resource for sending a random access preamble message.

[0128] Correspondingly, each terminal device located in the coverage area of ​​the network access device receives initial access information including the second indication information, the third indication information, the sixth indication information, the time slot count parameter and the configuration information of the public resources for sending the random access preamble message.

[0129] The second indication information is used to indicate the terminal device to be randomly accessed, the third indication information is used to indicate random access through 2-step random access, and the sixth indication information is used to indicate random access through CBRA.

[0130] S806: The target terminal device generates a random access opportunity based on the time slot count parameter.

[0131] The target terminal device is any terminal device to be randomly accessed.

[0132] S807: The target terminal device sends a random access preamble message to the network access device through the public resources used to send the random access preamble message according to the random access opportunity.

[0133] Correspondingly, the network access device receives the random access preamble message sent by the target terminal device.

[0134] The random access preamble message carries the Electronic Product Code (EPC) of the target terminal device.

[0135] S808. The network access device sends a random access response message (Random Access Response Message, Msg2) to the target terminal device.

[0136] Correspondingly, the target terminal device receives the random access response message sent by the network access device.

[0137] The random access response message carries a confirmation of the device permanent identifier.

[0138] S809: The network access device sends an initial UE message to the core network.

[0139] Correspondingly, the core network receives the initial UE message sent by the network access device.

[0140] Reference Fig. 9 As shown, if it is determined to adopt 2-step random access and contention-free random access, continue to perform the following steps:

[0141] S901. A network access device broadcasts initial access information including second indication information, third indication information, fifth indication information, and configuration information of dedicated resources for sending a random access preamble message.

[0142] Correspondingly, each terminal device located in the coverage area of ​​the network access device receives initial access information including the second indication information, the third indication information, the fifth indication information and the configuration information of the dedicated resources for sending the random access preamble message.

[0143] Among them, the second indication information is used to indicate the terminal device to be randomly accessed, the third indication information is used to indicate random access through 2-step random access, and the fifth indication information is used to indicate random access through CFRA.

[0144] S902. The target terminal device sends a random access preamble message to the network access device through a dedicated resource for sending a random access preamble message.

[0145] Correspondingly, the network access device receives the random access preamble message sent by the target terminal device.

[0146] The target terminal device is any terminal device to be randomly accessed, and the random access preamble message carries a permanent device identifier of the target terminal device.

[0147] Furthermore, the random access preamble message also carries a temporary identifier of the device.

[0148] S903: The network access device sends a random access response message to the target terminal device.

[0149] Correspondingly, the target terminal device receives the random access response message sent by the network access device.

[0150] The random access response message carries a confirmation of the device permanent identifier.

[0151] Furthermore, the random access response message also carries a device index configured by the network access device for the target terminal device.

[0152] S904: The network access device sends an initial UE message to the core network.

[0153] Correspondingly, the core network receives the initial UE message sent by the network access device.

[0154] Reference Fig.10 As shown, if the present application determines to adopt 4-step random access and contention-free random access, then continue to execute the following steps:

[0155] S1001. A network access device sends an initial trigger message carrying fourth indication information, fifth indication information and configuration information of a first communication resource to each terminal device to be randomly accessed.

[0156] Correspondingly, each terminal device to be randomly accessed receives an initial trigger message carrying the fourth indication information, the fifth indication information and the configuration information of the first communication resource.

[0157] The fourth indication information is used to indicate that random access is performed through 4-step random access, and the fifth indication information is used to indicate that random access is performed through CFRA.

[0158] Furthermore, the random access method provided above also includes: before sending the initial trigger message to the terminal device to be randomly accessed, adding second indication information to the initial trigger message. Sending the initial trigger message to the terminal device to be randomly accessed includes: broadcasting the initial trigger message.

[0159] Second indication information for indicating the terminal device to be randomly accessed is added to the initial trigger message, and the initial trigger message is broadcast. Therefore, the terminal device receiving the initial trigger message in the coverage area can determine whether it is the terminal device to be randomly accessed based on the second indication information, and then determine whether to perform random access in response to the initial trigger message.

[0160] S1002. The target terminal device sends a random access preamble message to the network access device through the first communication resource.

[0161] Correspondingly, the network access device receives the random access preamble message sent by the target terminal device via the first communication resource.

[0162] The target terminal device is any terminal device to be randomly accessed, and the random access preamble message carries a temporary equipment identifier (Temporary Equipment Identifier Code, TEIC) of the target terminal device.

[0163] S1003. The network access device sends random access response information to the target terminal device.

[0164] Correspondingly, the target terminal device receives the random access response information sent by the network access device.

[0165] The random access response information carries the device temporary identifier confirmation and the configuration information of the second communication resource used to send the first uplink scheduled transmission message (First Uplink Scheduled Transmission Message, Msg3).

[0166] In addition, the configuration information of the second communication resource is time domain resource configuration information based on TDMA, including: a time domain offset of the access opportunity and a time domain length of the access opportunity;

[0167] The time domain offset of the access opportunity is used to indicate the number of OFDM symbols from the start position of the access opportunity to the start position of the uplink time slot to which the access opportunity belongs, and the time domain length of the access opportunity is used to indicate the number of OFDM symbols from the start position of the access opportunity to the end position of the access opportunity. Fig.11 As shown, Fig.11 The present invention is a schematic diagram of the configuration of the second communication resource used to send the first uplink scheduling transmission information in the random access method. The random access response information sent by the network access device to the terminal device is sent on the downlink time slot 111 of the frame structure, and the first uplink scheduling transmission information sent by the terminal device to the network access device is scheduled in the uplink time slot 112 of the frame structure, and the time slot deviation between the two is Ts. After determining the uplink time slot 112 for sending the first uplink scheduling transmission information, the specific OFDM symbol resources of the TDMA access opportunity are represented by the time domain offset and the time domain length. Among them, the time domain offset of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the starting position of the uplink time slot to which the access opportunity belongs, and the time domain length of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the end position of the access opportunity. Fig.11In the figure, it is taken as an example that the uplink time slot 112 used for sending the first uplink scheduling transmission information has only one TDMA access opportunity: access opportunity 113; the time domain offset of access opportunity 113 is e and the time domain length is f.

[0168] In addition, the configuration information of the second communication resource is frequency domain resource configuration information based on FDMA, including: a time domain offset of the access opportunity, a time domain length of the access opportunity, and a frequency domain resource for accessing the video;

[0169] Among them, the time domain offset of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the starting position of the uplink time slot to which the access opportunity belongs, and the time domain length of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the end position of the access opportunity.

[0170] Reference Fig.12 As shown, Fig.12 The diagram is a configuration diagram of the second communication resource used to send Msg3 in the random access method. The random access response information sent by the network access device to the terminal device is sent in the downlink time slot 121 of the frame structure, and the Msg3 sent by the terminal device to the network access device is scheduled in the uplink time slot 122 of the frame structure, and the time slot deviation between the two is Ts. After determining the uplink time slot 122 for sending Msg3, the specific OFDM symbol resources of the FDMA access opportunity are represented by the time domain offset, the time domain length, and the frequency domain resources. Among them, the time domain offset of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the starting position of the uplink time slot to which the access opportunity belongs, and the time domain length of the access opportunity is used to indicate the number of OFDM symbols from the starting position of the access opportunity to the end position of the access opportunity. Fig.12 In the uplink time slot 122 used to send Msg3, there are two frequency domain access opportunities at the same time domain access opportunity: access opportunity 123 and access opportunity 124. The time domain offset of access opportunity 123 and access opportunity 124 is g, the time domain length is h, and the frequency domain resources of access opportunity 123 and access opportunity 124 are 1 to n RBs.

[0171] S1004. The target terminal device sends Msg3 to the network receiving device through the second communication resource.

[0172] Correspondingly, the network receiving device receives Msg3 sent by the target terminal device through the second communication resource.

[0173] Among them, Msg3 carries the Electronic Product Code (EPC) of the terminal device and uplink data.

[0174] In addition, the target terminal device sends Msg3 to the network receiving device, including: the target terminal device sends Msg3 to the network receiving device through the second communication resource.

[0175] S1005. The network receiving device sends a contention resolution message (ContentionResolution Message, Msg4) to the target terminal device.

[0176] Correspondingly, the target terminal device receives the contention resolution message sent by the network access device.

[0177] The contention resolution message carries confirmation of the device permanent identifier and downlink data.

[0178] S1006. The network access device sends an initial UE message to the core network.

[0179] Correspondingly, the core network receives the initial UE message sent by the network access device.

[0180] If it is determined to adopt 4-step random access and contention-based random access, the network access device sends an initial trigger message carrying the fourth indication information, the sixth indication information, the time slot count parameter and the configuration information of the first communication resource to each terminal device to be randomly accessed. Fig.13 As shown, the target terminal in the terminal device to be randomly accessed executes the following steps:

[0181] S1301. Receive an initial trigger message sent by a network access device.

[0182] The initial trigger message carries fourth indication information, sixth indication information and a time slot count parameter; the fourth indication information is used to indicate random access through 4-step random access, and the sixth indication information is used to indicate random access through CBRA.

[0183] In addition, the random access method provided above also includes: before sending the initial trigger message to the terminal device to be randomly accessed, adding second indication information to the initial trigger message. Sending the initial trigger message to the terminal device to be randomly accessed includes: broadcasting the initial trigger message.

[0184] Second indication information for indicating the terminal device to be randomly accessed is added to the initial trigger message, and the initial trigger message is broadcast. Therefore, the terminal device receiving the initial trigger message in the coverage area can determine whether it is the terminal device to be randomly accessed based on the second indication information, and then determine whether to perform random access in response to the initial trigger message.

[0185] S1302. Obtain a value of an access counter according to a timeslot counting parameter.

[0186] Further, obtaining a value of an access counter according to a timeslot counting parameter includes:

[0187] Randomly from [0, 2 Q ] as the value of the access counter. For example, if Q = 4, then an integer is randomly selected from [0, 16] as the value of the access counter.

[0188] S1303: Determine whether the value of the access counter is 0.

[0189] In the above step S1303, if it is determined that the value of the access counter is 0, step S1304 is executed.

[0190] S1304. Send Msg1 to the network access device.

[0191] Correspondingly, the network access device receives Msg1 sent by the target terminal device.

[0192] The random access preamble message carries a temporary equipment identifier (Temporary Equipment Identifier Code, TEIC) of the target terminal device.

[0193] In addition, sending Msg1 to the network access device includes: sending Msg1 to the network access device through the first communication resource.

[0194] If it is determined in step S1303 that the value of the access counter is not 0 (is a value greater than 0 and less than 2 Q Integer), the target terminal device executes step S1305.

[0195] S1305. When receiving the initial trigger message sent by the network access device, reduce the value of the access counter by one, and return to step S1303 to re-determine whether the value of the access counter is 0.

[0196] After the target terminal device executes step S1304 to send a random access preamble message to the network access device, the interaction process between the target terminal device, the network access device and the core network in the subsequent random access process is similar to the above embodiment, including: the network access device sends a random access response message to the target terminal device; the target terminal device sends Msg3 to the network receiving device; the network receiving device sends a contention resolution message to the target terminal device and sends an initial UE message to the core network. To avoid repetition, it is not described in detail here.

[0197] Exemplarily, the following takes the example that the terminal devices to be randomly accessed through 4-step contention-based random access include terminal devices A and terminal devices B, and the value of the access counter obtained by terminal device A according to the time slot count parameter is 0, and the value of the access counter obtained by terminal device B according to the time slot count parameter is 2 as an example to illustrate the implementation method of random access through 4-step contention-based random access. Fig.14 As shown, the random access method includes:

[0198] S1401. The network access device sends a first initial trigger message to terminal device A and terminal device B.

[0199] Correspondingly, terminal device A and terminal device B receive the first initial trigger message sent by the network access device.

[0200] Among them, the initial trigger message carries fourth indication information, sixth indication information, time slot count parameters and configuration information of the first communication resource. The fourth indication information is used to indicate random access through 4-step random access, and the sixth indication information is used to indicate random access through CBRA; the first initial trigger message is a trigger message for the first round and the first opportunity.

[0201] S1402. Terminal device A obtains the value of the access counter according to the timeslot counting parameter.

[0202] S1403. Terminal device B obtains the value of the access counter according to the timeslot counting parameter.

[0203] As shown above, the terminal device A obtains the access counter value of 0, and the terminal device B obtains the access counter value of 2 according to the time slot counting parameter.

[0204] S1404. Terminal device A sends a random access preamble message (Msg1) to the network access device.

[0205] S1405. The network access device sends a random access response message (Msg2) to terminal device A.

[0206] S1406. Terminal device A sends the first uplink scheduling transmission information (Msg3) to the network access device.

[0207] S1407. The network access device sends a contention resolution message (Msg4) to terminal device A.

[0208] S1408. The network access device sends a second initial trigger message to terminal device B.

[0209] The second initial trigger message is a trigger message of the first round at the second opportunity.

[0210] In addition, the second initial trigger message may only include the identifier of terminal device B and not include the time slot count parameter.

[0211] S1409. Terminal device B reduces the value of the access counter by one.

[0212] As shown above, terminal device B obtains the value of the access counter as 2 according to the time slot counting parameter, so after subtracting the value of the access counter by one, the value of the access counter is 1.

[0213] S1410. The network access device sends a third initial trigger message to terminal device B.

[0214] The third initial trigger message is a trigger message of the third opportunity in the first round.

[0215] In addition, the third initial trigger message may only include the identifier of the terminal device B and not include the time slot count parameter.

[0216] S1411. Terminal device B reduces the value of the access counter by one.

[0217] As shown above, after the last decrement, the value of the access counter is 1, and after the next decrement, the value of the access counter is 0, so the following steps are performed:

[0218] S1412. Terminal device B sends Msg1 to the network access device.

[0219] S1413. The network access device sends Msg2 to terminal device B.

[0220] S1414. Terminal device B sends Msg3 to the network access device.

[0221] S1415. The network access device sends Msg4 to terminal device B.

[0222] In addition, the random access method provided in the embodiment of the present application also includes: before the network access device sends an initial trigger message carrying fourth indication information to the terminal device to be randomly accessed, the network access device broadcasts a paging message within the coverage area.

[0223] The paging message carries the first indication information, the second indication information and access opportunity information; the access opportunity information includes the number of uplink time slots in one round of access and the number of access opportunities in one uplink time slot.

[0224] Reference Fig.15 As shown, the present application also provides a network access device 1500, and the network access device 1500 includes:

[0225] A receiving unit 151 is configured to receive a service request sent by a core network, where the service request is used to request to carry first indication information and second indication information, where the first indication information is used to indicate a triggering cause, and the second indication information is used to indicate a terminal device to be randomly accessed;

[0226] Processing unit 152 is used to obtain a target success rate and a target data volume; the target success rate is a success rate of sending random access preamble messages by terminal devices within the coverage area of ​​the network access device, and the target data volume is a data volume of the random access preamble message corresponding to the triggering cause indicated by the first indication information;

[0227] The sending unit 153 is used to send an initial trigger message carrying third indication information to the terminal device to be randomly accessed if the target success rate is greater than the threshold success rate and the target data volume is less than or equal to the threshold data volume, and the third indication information is used to indicate random access through 2-step random access.

[0228] Furthermore, the processing unit 152 is also used to determine whether the number of terminal devices to be randomly accessed is one before sending an initial trigger message carrying third indication information to the terminal devices to be randomly accessed, and, if the number of terminal devices to be randomly accessed is more than one, determine whether the service request carries the device identification of each terminal device to be randomly accessed; if the number of terminal devices to be randomly accessed is one, or the number of terminal devices to be randomly accessed is more than one but the service request carries the device identification of each terminal device to be randomly accessed, then add fifth indication information to the initial trigger message, and the fifth indication information is used to indicate random access through CFRA.

[0229] Furthermore, the processing unit 152 is further configured to add configuration information of dedicated resources for sending a random access preamble message to the initial trigger message before sending the initial trigger message carrying the third indication information to the terminal device to perform random access.

[0230] Further, the configuration information of the dedicated resources is time domain resource configuration information based on TDMA; or, the configuration information of the dedicated resources is frequency domain resource configuration information based on FDMA.

[0231] Furthermore, the processing unit 152 is also used to add sixth indication information in the initial trigger message if the number of terminal devices to be randomly accessed is more than one and the service request does not carry the device identifier of each terminal device to be randomly accessed, and the sixth indication information is used to indicate random access through CBRA.

[0232] Furthermore, the processing unit 152 is further configured to add configuration information of public resources for sending a random access preamble message to the initial trigger message before sending the initial trigger message carrying the third indication information to the terminal device to perform random access.

[0233] Further, the configuration information of the common resources is time domain resource configuration information based on TDMA; or, the configuration information of the common resources is frequency domain resource configuration information based on FDMA.

[0234] Furthermore, the processing unit 152 is further configured to add a timeslot count parameter to an initial trigger message before sending the initial trigger message carrying the third indication information to the terminal device to be randomly accessed.

[0235] Further, the processing unit 152 is further configured to add the second indication information to the initial trigger message before sending the initial trigger message carrying the third indication information to the terminal device to be randomly accessed;

[0236] The sending unit 153 is specifically configured to broadcast an initial trigger message carrying the second indication information and the third indication information.

[0237] Further, the receiving unit 151 is also used to receive a random access preamble message sent by a target terminal device after sending an initial trigger message carrying third indication information to the terminal device to be randomly accessed; the target terminal device is any terminal device to be randomly accessed, and the random access preamble message carries a device permanent identifier of the target terminal device;

[0238] The sending unit 153 is further configured to send a random access response message to the target terminal device, where the random access response message carries a confirmation of the device permanent identifier;

[0239] The sending unit is also used to send an initial user equipment UE message corresponding to the target terminal device to the core network.

[0240] Furthermore, the random access preamble message also carries a temporary device identifier of the target terminal device.

[0241] Furthermore, the random access response message also carries a device temporary identifier and a device permanent identifier.

[0242] Furthermore, the random access response message also carries a device index configured by the network access device for the target terminal device.

[0243] The network access device and terminal device provided in the present application can execute the above-mentioned random access method and can achieve the same or similar effects. To avoid redundancy, they will not be described in detail here.

[0244] The present application provides an electronic device. Fig.16 This is a structural diagram of an electronic device provided in the present application, the electronic device includes: a memory 161 and a processor 162, the memory 161 is used to store a computer program, and the processor 162 is used to execute the random access method provided in any of the above embodiments when executing the computer program.

[0245] The present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a computing device, the computing device implements the random access method provided in any of the above embodiments.

[0246] The present application also provides a chip, which includes a processor and a memory, wherein the memory is used to store programs or instructions that can be run on the processor, and the processor is used to execute the programs or instructions so that any of the random access methods in the above embodiments is executed.

[0247] The present application also provides a computer program product. When the computer program product runs on a computer, the computer implements the random access method of any of the above embodiments.

[0248] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0249] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A random access method, characterized in that: Applied to a network access device, the method comprises: Receive a service request sent by a core network, where the service request is used to request to carry first indication information and second indication information, where the first indication information is used to indicate a triggering cause, and the second indication information is used to indicate a terminal device to be randomly accessed; Obtaining a target success rate and a target data volume; the target success rate is a success rate of sending a random access preamble message to a terminal device within a coverage area of ​​the network access device, and the target data volume is a data volume of the random access preamble message corresponding to a triggering cause indicated by the first indication information; If the target success rate is greater than the threshold success rate, and the target data volume is less than or equal to the threshold data volume, an initial trigger message carrying third indication information is sent to the terminal device to be randomly accessed, and the third indication information is used to indicate random access through 2-step random access.

2. The method according to claim 1, characterized in that The method further comprises: Before sending an initial trigger message carrying third indication information to a terminal device to be randomly accessed, determining whether the number of the terminal device to be randomly accessed is one; If the number of terminal devices to be randomly accessed is more than one, determining whether the service request carries a device identifier of each terminal device to be randomly accessed; If the number of terminal devices to be randomly accessed is one, or the number of terminal devices to be randomly accessed is more than one and the service request carries the device identifier of each terminal device to be randomly accessed, then fifth indication information is added to the initial trigger message, and the fifth indication information is used to indicate random access through contention-free random access CFRA.

3. The method according to claim 2, characterized in that The method further comprises: Before sending an initial trigger message carrying the third indication information to a terminal device to perform random access, configuration information of dedicated resources for sending the random access preamble message is added to the initial trigger message.

4. The method according to claim 3, characterized in that The configuration information of the dedicated resources is time domain resource configuration information based on time division multiple access TDMA; or, the configuration information of the dedicated resources is frequency domain resource configuration information based on frequency division multiple access FDMA.

5. The method according to claim 2, characterized in that: The method further comprises: If the number of terminal devices to be randomly accessed is more than one, and the service request does not carry the device identification of each terminal device to be randomly accessed, then sixth indication information is added to the initial trigger message, and the sixth indication information is used to indicate random access through contention-based random access CBRA.

6. The method according to claim 5, characterized in that The method further comprises: Before sending an initial trigger message carrying the third indication information to a terminal device to perform random access, configuration information of a public resource for sending the random access preamble message is added to the initial trigger message.

7. The method according to claim 6, characterized in that The configuration information of the common resources is time domain resource configuration information based on TDMA; or, the configuration information of the common resources is frequency domain resource configuration information based on FDMA.

8. The method according to claim 5, characterized in that The method further comprises: Before sending an initial trigger message carrying the third indication information to a terminal device to be randomly accessed, a time slot count parameter is added to the initial trigger message.

9. The method according to claim 1, characterized in that: The method further comprises: Before sending an initial trigger message carrying the third indication information to a terminal device to be randomly accessed, adding the second indication information to the initial trigger message; The sending an initial trigger message carrying third indication information to a terminal device to be randomly accessed includes: Broadcast the initial trigger message carrying the second indication information and the third indication information.

10. The method according to any one of claims 1 to 9, characterized in that: The method further comprises: After sending an initial trigger message carrying third indication information to a terminal device to be randomly accessed, receiving the random access preamble message sent by a target terminal device; the target terminal device is any terminal device to be randomly accessed, and the random access preamble message carries a device permanent identifier of the target terminal device; Sending a random access response message to the target terminal device, where the random access response message carries a device permanent identifier confirmation; Send an initial user equipment UE message corresponding to the target terminal device to the core network.

11. The method according to claim 10, characterized in that The random access preamble message also carries a temporary device identifier of the target terminal device.

12. The method according to claim 11, characterized in that The random access response message also carries the device temporary identifier and the device permanent identifier.

13. The method according to claim 10, characterized in that The random access response message also carries a device index configured by the network access device for the target terminal device.

14. A network access device, characterized in that: include: A receiving unit, configured to receive a service request sent by a core network, wherein the service request is used to request to carry first indication information and second indication information, wherein the first indication information is used to indicate a triggering cause, and the second indication information is used to indicate a terminal device to be randomly accessed; a processing unit, configured to obtain a target success rate and a target data volume; the target success rate is a success rate of sending a random access preamble message to a terminal device within a coverage area of ​​the network access device, and the target data volume is a data volume of the random access preamble message corresponding to a triggering cause indicated by the first indication information; A sending unit is used to send an initial trigger message carrying third indication information to the terminal device to be randomly accessed if the target success rate is greater than the threshold success rate and the target data volume is less than or equal to the threshold data volume, wherein the third indication information is used to indicate random access through 2-step random access.

15. An electronic device, characterized in that: include: A memory and a processor, wherein the memory stores a computer program, and the processor is configured to implement the random access method according to any one of claims 1 to 13 when executing the computer program.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a computing device, the computing device implements the random access method according to any one of claims 1 to 13.

17. A chip, characterized in that: The chip includes a processor and a memory, the memory is used to store programs or instructions that can be run on the processor, and the processor is used to execute the program or instructions so that the random access method according to any one of claims 1 to 13 is executed.

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