Communication method, environment Internet of Things system, Internet of Things equipment and access network equipment

Abstract

The invention provides a communication method, an environment Internet of Things system, Internet of Things equipment and access network equipment, and relates to the technical field of Internet of Things. In the method, an access network device sends a first message to an IoT device; the IoT device determines a target access opportunity and a first frequency domain resource in response to the first message, and sends a second message to the access network device based on the target access opportunity and the first frequency domain resource, the access network device generates a third message based on the second message and sends the third message to the IoT device, and the IoT device determines a second frequency resource and / or target power according to the third message, and sending a fourth message to the access network equipment based on the second frequency resource and / or the target power. In the scheme, the access network equipment can avoid conflicts or interferences possibly existing in the uplink transmission process of the IoT equipment in the configuration stage, and the connection success rate of the IoT equipment and the access network equipment is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of Internet of Things, and more particularly, to a communication method, an environmental Internet of Things system, an Internet of Things device, an access network device and a program product. BACKGROUND

[0002] In recent years, Internet of Things (IoT) has attracted extensive attention in the field of wireless communication. By correlating more IoT devices with each other, production efficiency can be improved.

[0003] Generally, an IoT device communicates based on a wireless communication network, and its peak power consumption is generally greater than 10 mW (milliwatt). Since the power consumption of the IoT device is large, the IoT device is mostly powered by a battery. Therefore, when maintaining the IoT device, the battery needs to be manually replaced or the IoT device needs to be charged. This results in high maintenance cost. SUMMARY

[0004] The present application provides a communication method, an environmental Internet of Things system, an Internet of Things device and an access network device, which can improve the connection success rate of an IoT device and an access network device.

[0005] To achieve the above object, the present application adopts the following technical solutions:

[0006] In a first aspect, a communication method is provided, the method is applied to an IoT device, and the method comprises: receiving a first message, the first message is used for a resource used by the IoT device to send a second message; sending the second message in response to the first message, wherein the second message comprises a first identifier, or comprises the first identifier and first information, the first information comprises a device type and / or a maximum transmission power of the IoT device; receiving a third message, the third message is used for determining a frequency resource and a power used by the IoT device to send a fourth message; the third message is determined by an access network device based on the second message; determining a second frequency resource and / or a target power based on the third message, and sending the fourth message based on the second frequency resource and / or the target power.

[0007] In the application, the access network device sends a first message to the IoT device; the IoT device determines a target access occasion and a first frequency domain resource in response to the first message, and sends a second message to the access network device based on the target access occasion and the first frequency domain resource; the access network device generates a third message based on the second message and sends the third message to the IoT device; the IoT device determines a second frequency resource and / or a target power according to the third message, and sends a fourth message to the access network device based on the second frequency resource and / or the target power. In the scheme, the access network device can avoid the conflict or interference that may exist in the uplink transmission process of each IoT device in the configuration stage, and improve the connection success rate of the IoT device and the access network device.

[0008] In one of the embodiments, the sending of the second message in response to the first message comprises: determining a candidate occasion set composed of multiple candidate occasions based on the first message, the device type and / or the maximum transmission power of the IoT device; determining the target access occasion from the candidate occasion set, and sending the second message based on the target access occasion.

[0009] In the embodiments of the application, the determination of the target access occasion is related to the device type and / or the maximum transmission power of the IoT device, so the reporting occasions of the IoT devices can be classified according to the device type and / or the maximum transmission power, and the unordered access of all IoT devices can be avoided, thereby improving the connection success rate of the IoT device and the access network device.

[0010] In one of the embodiments, the first message comprises time domain resource indication information, the time domain resource indication information indicates one or more candidate occasion sets, and the sending of the second message in response to the first message comprises: determining a target candidate occasion set from the one or more candidate occasion sets according to the device type and / or the maximum transmission power of the IoT device; determining the target access occasion from the target candidate occasion set, and sending the second message based on the target access occasion.

[0011] In the embodiments of the application, the first message comprises time domain resource indication information, the time domain resource indication information indicates one or more candidate occasion sets, and the access network device manages the target access occasion used by the IoT device when reporting the second message through the first message, so the unordered access of all IoT devices can be avoided, thereby improving the connection success rate of the IoT device and the access network device.

[0012] In one of the embodiments, the candidate occasion set is a set of multiple candidate occasions that are continuous in the time domain.

[0013] In one of the embodiments, the time domain resource indication information includes a plurality of time domain indication parameters, the time domain indication parameters are used to determine one or more candidate time occasion sets, and the determining the target candidate time occasion set from the one or more candidate time occasion sets according to the device type and / or the maximum transmission power of the IoT device includes: determining a target time domain indication parameter from the plurality of time domain indication parameters according to the device type and / or the maximum transmission power of the IoT device; determining a time domain range according to the target time domain indication parameter, and determining the target candidate time occasion set according to the time domain range.

[0014] In the embodiments of the present application, the candidate time occasion set is calculated through the time domain indication parameter, the time domain indication parameter occupies a small number of bits in the first message, and the overhead of the first message can be saved. In addition, the target access time occasion used by the IoT device when reporting the second message is managed through the time domain indication parameter, and unordered access of all IoT devices is avoided. Therefore, the connection success rate of the IoT device and the access network device is improved.

[0015] In one of the embodiments, the sending the second message in response to the first message includes: determining a frequency domain resource set composed of a plurality of candidate frequency domain resources based on the first message, the device type and / or the maximum transmission power of the IoT device; determining the first frequency domain resource from the frequency domain resource set, and sending the second message based on the first frequency domain resource.

[0016] In the embodiments of the present application, the determination process of the first frequency domain resource is related to the device type and / or the maximum transmission power of the IoT device, so the frequency domain resource used by the IoT device when reporting the second message can be classified according to the device type and / or the maximum transmission power, and unordered access of all IoT devices is avoided. Therefore, the connection success rate of the IoT device and the access network device is improved.

[0017] In one of the embodiments, the first message includes frequency domain resource indication information, the frequency domain resource indication information indicates one or more frequency domain resource sets, and the sending the second message in response to the first message includes: determining a target frequency domain resource set from the one or more frequency domain resource sets according to the device type and / or the maximum transmission power of the IoT device; determining the first frequency domain resource from the target frequency domain resource set, and sending the second message based on the first frequency domain resource.

[0018] In one of the embodiments, the frequency domain resource set is a set of a plurality of frequency domain resources that are continuous in the frequency domain.

[0019] In one of the embodiments, the frequency domain resource indication information comprises a plurality of frequency domain indication parameters, the frequency domain indication parameters are used to determine one or more frequency domain resource sets, and the determining the target frequency domain resource set from the one or more frequency domain resource sets according to the device type and / or the maximum transmission power of the IoT device comprises: determining a target frequency domain indication parameter from the plurality of frequency domain indication parameters according to the device type and / or the maximum transmission power of the IoT device; determining a frequency domain range according to the target frequency domain indication parameter, and determining the target frequency domain resource set according to the frequency domain range.

[0020] In one of the embodiments, the third message comprises at least one of proximity indication information, frequency domain resource information, and power control information, the proximity indication is used to represent the distance between the IoT device and the access network device, and the determining the second frequency resource and / or the target power based on the third message comprises: determining the target power based on the proximity indication information and / or the power control information; and / or determining the second frequency resource based on the frequency domain resource information.

[0021] In one of the embodiments, the frequency domain resource information comprises any one of a frequency interval, a frequency value, and a frequency offset.

[0022] In one of the embodiments, the power control information further comprises any one of a power interval, a power value, and a power change amount.

[0023] In one of the embodiments, before the sending the second message in response to the first message, the method further comprises: receiving a paging-like message from the access network device, the paging-like message comprising an identifier of the access network device; and determining whether to respond to the first message according to the identifier of the access network device.

[0024] In a second aspect, a communication method is provided, the method being applied to an access network device, and the method comprising: sending a first message, the first message being used for an IoT device to send a second message; receiving the second message, the second message being sent by the IoT device in response to the first message, the second message comprising a first identifier or comprising the first identifier and first information, the first information comprising a device type and / or a maximum transmission power of the IoT device; sending a third message in response to the second message, the third message being used for the IoT device to determine a frequency resource and a power used by the IoT device to send a fourth message to the access network device; and receiving the fourth message, the fourth message being sent by the IoT device based on a second frequency resource and / or a target power, the second frequency resource and / or the target power being determined by the IoT device based on the third message.

[0025] In one of the embodiments, the target access occasion is determined by the IoT device from a set of candidate occasions, the set of candidate occasions is determined by the IoT device based on the first message, a device type and / or a maximum transmission power of the IoT device, and the set of candidate occasions comprises a plurality of candidate occasions.

[0026] In one of the embodiments, the first message comprises time domain resource indication information, the time domain resource indication information indicates one or more sets of candidate occasions, and the target access occasion is determined by the IoT device from a target set of candidate occasions, the target set of candidate occasions is determined by the IoT device from the one or more sets of candidate occasions according to the device type and / or the maximum transmission power of the IoT device.

[0027] In one of the embodiments, the set of candidate occasions comprises a plurality of candidate occasions which are continuous in time domain.

[0028] In one of the embodiments, the time domain resource indication information comprises a plurality of time domain indication parameters, the time domain indication parameters are used to determine one or more sets of candidate occasions, and the target set of candidate occasions is determined by the IoT device based on a target time domain indication parameter, the target time domain indication parameter is determined by the IoT device from the plurality of time domain indication parameters according to the device type and / or the maximum transmission power of the IoT device.

[0029] In one of the embodiments, the first frequency domain resource is determined by the IoT device from a set of frequency domain resources, the set of frequency domain resources is determined by the IoT device based on the first message, a device type and / or a maximum transmission power of the IoT device, and the set of frequency domain resources comprises a plurality of candidate frequency domain resources.

[0030] In one of the embodiments, the first message comprises frequency domain resource indication information, the frequency domain resource indication information indicates one or more sets of frequency domain resources, and the first frequency domain resource is determined by the IoT device from a target set of frequency domain resources, the target set of frequency domain resources is determined by the IoT device from the one or more sets of frequency domain resources according to the device type and / or the maximum transmission power of the IoT device.

[0031] In one of the embodiments, the set of frequency domain resources comprises a plurality of frequency domain resources which are continuous in frequency domain.

[0032] In one of the embodiments, the frequency domain resource indication information comprises a plurality of frequency domain indication parameters, and the frequency domain indication parameters are used to determine one or more frequency domain resource sets, wherein the target frequency domain resource set is determined according to a target frequency domain indication parameter, and the target frequency domain indication parameter is determined according to a device type and / or a maximum transmission power of the IoT device from the plurality of frequency domain indication parameters.

[0033] In one of the embodiments, the sending the third message in response to the second message comprises: in a case where the second message comprises the first identifier, acquiring at least one of an access occasion, a transmission power and a transmission frequency used by the IoT device when sending the second message in a process of receiving the second message, determining a device type and / or a maximum transmission power of the IoT device according to the at least one of the access occasion, the transmission power and the transmission frequency; generating the third message according to the device type and / or the maximum transmission power of the IoT device; and in a case where the second message comprises the first identifier and first information, generating the third message according to the first information.

[0034] In one of the embodiments, the third message comprises at least one of proximity indication information, frequency domain resource information and power control information, and the proximity indication information is used to represent a distance between the IoT device and the access network device.

[0035] In one of the embodiments, the frequency domain resource information comprises any one of a frequency interval, a frequency value and a frequency offset.

[0036] In one of the embodiments, the power control information further comprises any one of a power interval, a power value and a power change amount.

[0037] In one of the embodiments, before the sending the first message to the IoT device, the method further comprises:

[0038] sending a class paging message, wherein the class paging message comprises an identifier of the access network device, and the identifier of the access network device is used to trigger the IoT device to determine whether to respond to the first message.

[0039] In a third aspect, an environmental Internet of Things system is provided, comprising an IoT device and an access network device, wherein the IoT device performs the communication method in any one of the first aspect, and the access network device performs the communication method in any one of the second aspect.

[0040] In a fourth aspect, an environmental Internet of Things device is provided, comprising a module for performing the communication method in any one of the first aspect.

[0041] In a fifth aspect, an access network device is provided, comprising modules for performing the communication method according to any one of the above second aspects.

[0042] In a sixth aspect, a computer readable storage medium is provided, having stored therein computer programs or instructions, which, when executed by a communication device, implement the communication method according to any one of the above first aspects, or implement the communication method according to any one of the above second aspects.

[0043] In a seventh aspect, a computer program product is provided, comprising instructions which, when executed on a computer, cause the computer to perform the communication method according to any one of the above first aspects, or perform the communication method according to any one of the above second aspects. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 A schematic diagram of an environmental IoT system is shown;

[0045] Figure 2 A schematic diagram of another environmental IoT system is shown;

[0046] Figure 3 A schematic diagram of a communication method provided by an embodiment of the present application is shown;

[0047] Figure 4 A signaling interaction diagram of a communication method is shown;

[0048] Figure 5 A signaling interaction diagram of a communication method is shown;

[0049] Figure 6 An access flow schematic diagram is shown;

[0050] Figure 7 A signaling interaction diagram of a communication method is shown;

[0051] Figure 8 An access flow schematic diagram is shown;

[0052] Figure 9 A signaling interaction diagram of a communication method is shown;

[0053] Figure 10 A schematic block diagram of an IoT device provided by the present application is shown;

[0054] Figure 11 A schematic block diagram of another access network device provided by the present application is shown;

[0055] Figure 12 A schematic diagram of an information transmission scenario provided by the present application is shown. DETAILED DESCRIPTION

[0056] The technical solutions in the present application will be described below with reference to the drawings.

[0057] In order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, the same items or similar items with basically the same functions and effects are distinguished by using "first", "second", etc. For example, the first chip and the second chip are only used to distinguish different chips, and do not limit the sequence. Those skilled in the art can understand that "first", "second", etc. do not limit the quantity and execution sequence, and "first", "second", etc. also do not necessarily mean different.

[0058] It should be noted that in the embodiments of the present application, "exemplary" or "for example" is used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplary" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" is intended to present the relevant concept in a specific manner.

[0059] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" describes the association between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the following cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b, or c, can represent a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0060] In the present application, "indication" can include direct indication and indirect indication. For example, when describing an information indicating information I, the information can directly indicate I or indirectly indicate I, but it does not necessarily indicate that the information carries I.

[0061] In recent years, the Internet of Things (IoT) has received extensive attention in the field of wireless communication. By correlating more Internet of Things devices with each other, production efficiency can be improved.

[0062] Generally, the Internet of Things device is based on a wireless communication network for communication, and its peak power consumption is generally greater than 10 mW (milliwatt). Since the power consumption of the Internet of Things device is large, the Internet of Things device is mostly powered by a battery. Therefore, when maintaining the Internet of Things device, the battery needs to be manually replaced or the Internet of Things device needs to be charged.

[0063] However, on the one hand, manually replacing the battery or charging the Internet of Things device is cumbersome and prone to omissions and the like. On the other hand, it is expected that in the future, hundreds of thousands or even millions of Internet of Things devices will be interconnected to meet various application requirements. Thus, the workload of manually replacing the battery or charging the Internet of Things device will surge, resulting in high maintenance costs.

[0064] In addition, if the Internet of Things device is a device in a specific working condition place such as the power industry or the oil industry, the battery in the Internet of Things device may also cause safety hazards.

[0065] Therefore, a new Internet of Things technology is needed to support a battery-free Internet of Things device or an Internet of Things device that does not need to be manually replaced and does not need to be manually charged.

[0066] Currently, a scheme for using Radio Frequency Identification (RFID) technology to realize the Internet of Things is proposed.

[0067] In the Internet of Things, the execution process of the RFID technology is as follows: a reader transmits a radio frequency signal such as a carrier signal to a tag device arranged on a target object. After receiving the radio frequency signal, the tag device generates an induced current and enters a working state, triggering the tag device to modulate the information of the tag device (such as an identity document (ID) of the tag device) and transmit the modulated information of the tag device. After receiving the modulated information of the tag device, the reader transmits the signal to a signal processing module of the reader, and the signal processing module completes the processing of the signal (such as demodulation and decoding of the signal), and transmits the processed information of the tag device to a host connected to the reader. The host identifies the information of the tag device and makes corresponding processing and control according to the setting of the information of the tag device. It should be noted that the information of the tag device is bound to the information of the target object on which the tag device is arranged. Therefore, it can be understood that the information of the tag device represents the information of the target object on which the tag device is arranged.

[0068] In this scheme, the tag device stores energy by collecting energy, and realizes wireless access based on the carrier signal and the reader. Both the purpose of realizing the Internet of Things and the problem of the battery in the foregoing content can be avoided.

[0069] However, in the aforementioned RFID technologies, the reader can typically only acquire information from one tag device at a time and send that information to the host. In other words, each execution of this process can only identify one tag device. When information from multiple tag devices needs to be acquired, the reader must perform this process multiple times, resulting in low efficiency.

[0070] For example, in warehouse management applications, warehouses store a large number of materials, each tagged with a device that reports its information to the host computer. Furthermore, the materials in the warehouse are constantly changing, with large quantities of items entering or leaving the warehouse. If RFID technology is used, only one tag can be identified at a time, resulting in extremely low efficiency in material handling.

[0071] In addition, in RFID technology, the signal transmission distance between the reader and the tag device is within the range of 0-1 meter, which is relatively short and limits the signal coverage between the reader and the tag device.

[0072] To address the aforementioned technical problems, this application provides an environmental IoT system, comprising IoT devices and access network devices. The access network device sends a first message to the IoT device. In response to the first message, the IoT device determines a target access timing and a first frequency domain resource, and sends a second message to the access network device based on the target access timing and the first frequency domain resource. The access network device generates a third message based on the second message and sends it to the IoT device. The IoT device determines a second frequency resource and / or a target power based on the third message, and sends a fourth message to the access network device based on the second frequency resource and / or the target power. The fourth message carries an IoT device identifier. In this solution, the access network device can configure transmission resources for different IoT devices. Therefore, during the configuration phase, potential conflicts or interference during the uplink transmission of various IoT devices can be avoided. This reduces the likelihood of conflicts or interference between the IoT device and other IoT devices when the second or fourth message is sent, improving the connection success rate between the IoT device and the access network device.

[0073] The following section explains the IoT system for this environment and the relevant knowledge involved in this solution:

[0074] like Figure 1 As shown, Figure 1A schematic diagram of an ambient Internet of Things (IoT) system is shown, which includes IoT terminal devices (hereinafter referred to as IoT devices) and access network devices, wherein the IoT devices and the access network devices can communicate with each other by using radio frequency (RF) signals. In the embodiments of the present application, the IoT devices are passive devices, and the access network devices include readers. The access network devices and the IoT devices communicate with each other by using RF signals, which is essentially that the readers in the access network devices and the devices communicate with each other by using RF signals. Hereinafter, the access network devices are referred to as readers.

[0075] In the embodiments of the present application, the readers can send RF signals, and the passive devices located near the readers can detect the RF signals sent by the readers and return response RF signals to the readers, wherein the response RF signals can carry the relevant information of the devices, and the readers can detect and analyze the response RF signals.

[0076] Figure 1 An example of a reader and a device is shown in the ambient IoT system, wherein one reader can communicate with multiple devices, and the ambient IoT system can include multiple readers.

[0077] In the embodiments of the present application, Figure 1 The ambient IoT system shown in the above can be applied to various communication systems, such as the 5th generation (5G) mobile communication system or new radio access technology (NR) and future communication systems. The 5G mobile communication system can include a non-standalone (NSA) communication system and / or a standalone (SA) communication system.

[0078] In the embodiments of the present application, the readers can be base stations, micro base stations, mobile terminals, wearable devices, routers, repeaters, etc. that can communicate with base stations.

[0079] In the embodiments of the present application, the IoT devices are ambient IoT (A-IoT) devices, such as passive devices including smart tags, passive tags, active tags, small controllers, microcontrollers, microsensors, etc. The IoT devices can also refer to various products installed with A-IoT devices, such as personal wearable devices, cars, scooters, industrial control elements, smart home devices, and sub-mother handheld phones, etc. In one possible implementation, the IoT devices of the present application can be low-power devices or low-computing-power devices, or devices without batteries or with limited energy storage capacity.

[0080] From the perspective of power consumption, there are two orders of magnitude of modes in Ambient IoT, i.e., micro-watt and hundreds of micro-watt. The micro-watt level mode mainly relies on pure reflection backscattering to be implemented. That is, the base station sends a signal, and the device reflects the energy back. The characteristic is low energy consumption, generally about 1 micro-watt. The mode has a small order of magnitude of received and reflected energy, but it is enough to transmit low-flow data, and is suitable for electronic tag type scenarios.

[0081] The micro-watt level mode transmission range can be further expanded, i.e., the hundreds of micro-watt mode implements energy collection and drives an amplifier to transmit the signal a little farther. This mode collects and stores energy through a capacitor. For example, when a certain amount of voltage is collected, a small power amplifier can be driven, so as to amplify the signal to transmit farther, reaching the order of 100 micro-watts. In this mode, logistics tracking, environmental monitoring and other applications can be implemented.

[0082] From the power consumption level of the A-IoT device 120 and its ability to generate signals, the A-IoT device 120 can be divided into the following three categories:

[0083] Device1 (first device type): the peak power consumption is about ~ 1 μW (micro-watt), has energy storage, the initial sampling frequency offset (SFO) is as high as 10X ppm, and neither DL nor UL in the device has amplification function. The UL transmission of the device is backscattered on the carrier provided externally, and there is no independent signal generation.

[0084] Device2a (second device type): the peak power consumption is ≤ hundreds of μW, has energy storage, the initial sampling frequency offset (SFO) is as high as 10X ppm, and the device has DL and / or UL amplification function. The UL transmission of the device is backscattered on the carrier provided externally. There is no independent signal generation, and there is a power amplifier (PA), and the stored energy can be used to amplify the reflected signal.

[0085] Device2b (third device type): the peak power consumption is ≤ hundreds of μW, has energy storage, the initial sampling frequency offset (SFO) is as high as 10X ppm, and the device has DL and / or UL amplification function. The UL transmission of the device is generated internally. There is a power amplifier PA, and there is independent signal generation.

[0086] It can be seen that the device types of IoT devices are different, and their peak power consumptions are different, which means that their signal coverage ranges are different. In the embodiments of the present application, the signal coverage ranges of type 2a and type 2b are farther. In addition, type 2a and type 2b both contain power amplifiers, so the frequency adjustment function can be realized. Further, it can be seen that type 2b does not need an external device to provide a carrier signal, so the frequency adjustment capability is better, and the frequency adjustment range is larger.

[0087] In the embodiments of the present application, the IoT device and the access network device can communicate through a direct connection, as shown in Figure 1 In this case, the distance between the IoT device and the access network device is generally close, for example, both are arranged indoors, in a small space.

[0088] In another implementation manner, the IoT device can be connected with the access network device through an intermediate node, wherein the intermediate node is an electronic device with a reader function and can communicate with the base station through a network. As shown in Figure 2 Figure 2 Another schematic diagram of an ambient Internet of Things system is shown, which includes an outdoor base station, an intermediate node and a device, the intermediate node is a reader, the reader communicates with the device through a radio frequency signal, and the reader and the outdoor base station can communicate through a network. This case is suitable for the distance between the IoT device and the access network device being far away, which exceeds the signal coverage range of the IoT device. The relay is formed by adding the intermediate node.

[0089] In the embodiments of the present application, the intermediate node can be a mobile phone or other device supporting 5G NR.

[0090] It should be understood that Figure 1 and Figure 2 The architecture of the ambient Internet of Things system shown in Figure 1 and Figure 2 is only illustrative.

[0091] The information transmission scenarios of the above three devices are described below according to whether the excitation source CW is located inside the base station, as shown in Figure 12 R represents Reader, which can be a base station or an intermediate node (mobile phone), D represents Ambient IoT device, and CW represents a node providing an external carrier for the device for backscattering. CW can be external or the Reader itself. R2D represents downlink (Reader to Device), D2R represents uplink (Device to Reader), and CW2D represents external carrier to Device.​

[0092] In the embodiments of the present application, the two device types of device1 and device2a are IoT devices, and the excitation source of the IoT devices is CW, which can be integrated with the reader, as shown in Figure 12 (a) and (b) of FIG. 1, wherein the CW is integrated with the reader 1 (R for short) in the access network device, and in the case of providing an external carrier, the access network device assumes the function of the CW, and in the process of communication with the device (D for short), the access network device assumes the function of the R.

[0093] As shown in (a) of FIG. 1, when the access network device assumes the function of the CW, the downlink thereof is shown by the arrow corresponding to CW2D in (a) of FIG. 1; when the access network device assumes the function of the R, the downlink thereof is shown by the arrow corresponding to R2D in (a) of FIG. 1. Figure 12 As shown in (a) of FIG. 1, when the access network device assumes the function of the CW, the downlink thereof is shown by the arrow corresponding to CW2D in (a) of FIG. 1; when the access network device assumes the function of the R, the downlink thereof is shown by the arrow corresponding to R2D in (a) of FIG. 1. Figure 12 As shown in (a) of FIG. 1, when the access network device assumes the function of the CW, the downlink thereof is shown by the arrow corresponding to CW2D in (a) of FIG. 1; when the access network device assumes the function of the R, the downlink thereof is shown by the arrow corresponding to R2D in (a) of FIG. 1. Figure 12 As shown in (a) of FIG. 1, when the access network device assumes the function of the CW, the downlink thereof is shown by the arrow corresponding to CW2D in (a) of FIG. 1; when the access network device assumes the function of the R, the downlink thereof is shown by the arrow corresponding to R2D in (a) of FIG. 1. Figure 12 As shown in (a) of FIG. 1, when the access network device assumes the function of the CW, the downlink thereof is shown by the arrow corresponding to CW2D in (a) of FIG. 1; when the access network device assumes the function of the R, the downlink thereof is shown by the arrow corresponding to R2D in (a) of FIG. 1.

[0094] As shown in (b) of FIG. 1, it includes one device and two readers, which are represented by R1 and R2 respectively, and the device can communicate with R1 and R2, that is, in the present scheme, not only one reader can link multiple devices, but also one device can link more than one reader. Figure 12 As shown in (b) of FIG. 1, it includes one device and two readers, which are represented by R1 and R2 respectively, and the device can communicate with R1 and R2, that is, in the present scheme, not only one reader can link multiple devices, but also one device can link more than one reader. As shown in (b) of FIG. 1, it includes one device and two readers, which are represented by R1 and R2 respectively, and the device can communicate with R1 and R2, that is, in the present scheme, not only one reader can link multiple devices, but also one device can link more than one reader.

[0095] As shown in (b) of FIG. 1, it includes one device and two readers, which are represented by R1 and R2 respectively, and the device can communicate with R1 and R2, that is, in the present scheme, not only one reader can link multiple devices, but also one device can link more than one reader. Figure 12 As shown in (b) of FIG. 1, it includes one device and two readers, which are represented by R1 and R2 respectively, and the device can communicate with R1 and R2, that is, in the present scheme, not only one reader can link multiple devices, but also one device can link more than one reader. Figure 12 As shown in (b) of FIG. 1, it includes one device and two readers, which are represented by R1 and R2 respectively, and the device can communicate with R1 and R2, that is, in the present scheme, not only one reader can link multiple devices, but also one device can link more than one reader. Figure 12 As shown in (b) of FIG. 1, it includes one device and two readers, which are represented by R1 and R2 respectively, and the device can communicate with R1 and R2, that is, in the present scheme, not only one reader can link multiple devices, but also one device can link more than one reader. Figure 12 As shown in (b) of FIG. 1, it includes one device and two readers, which are represented by R1 and R2 respectively, and the device can communicate with R1 and R2, that is, in the present scheme, not only one reader can link multiple devices, but also one device can link more than one reader.

[0096] In the embodiments of the present application, the device can select a reader closer to itself for access, and the implementation process can be referred to the following description. Figure 12 As shown in (b) of FIG. 1, it includes one device and two readers, which are represented by R1 and R2 respectively, and the device can communicate with R1 and R2, that is, in the present scheme, not only one reader can link multiple devices, but also one device can link more than one reader.

[0097] In the embodiments of the present application, the excitation source of CW can also be set separately from the reader, as shown in (c) of FIG. 1, wherein the CW sends an external carrier signal to the D, and the downlink thereof is shown by the arrow corresponding to CW2D in (c) of FIG. 1. Figure 12 In the embodiments of the present application, the excitation source of CW can also be set separately from the reader, as shown in (c) of FIG. 1, wherein the CW sends an external carrier signal to the D, and the downlink thereof is shown by the arrow corresponding to CW2D in (c) of FIG. 1. Figure 12corresponding to D2R in (c) of FIG. 10. When the reader sends a downlink signal to the device, its downlink is as shown by the arrow corresponding to R2D in (c) of FIG. 10. Figure 12 corresponding to D2R in (c) of FIG. 10. When the reader sends a downlink signal to the device, its downlink is as shown by the arrow corresponding to R2D in (c) of FIG. 10. Figure 12 corresponding to D2R in (c) of FIG. 10. When the reader sends a downlink signal to the device, its downlink is as shown by the arrow corresponding to R2D in (c) of FIG. 10.

[0098] In the embodiments of the present application, for the device type of device2b, the external excitation source CW is not needed, in which case, the interaction process between the device and the reader can be as shown in (d) of FIG. 10. In this case, the access network device undertakes the function of communication, and its downlink is as shown by the arrow corresponding to R2D in (d) of FIG. 10. Figure 12 corresponding to D2R in (c) of FIG. 10. When the reader sends a downlink signal to the device, its downlink is as shown by the arrow corresponding to R2D in (c) of FIG. 10. Figure 3 corresponding to D2R in (c) of FIG. 10. When the reader sends a downlink signal to the device, its downlink is as shown by the arrow corresponding to R2D in (c) of FIG. 10. Figure 3 corresponding to D2R in (c) of FIG. 10. When the reader sends a downlink signal to the device, its downlink is as shown by the arrow corresponding to R2D in (c) of FIG. 10.

[0099] It should be noted that in the embodiments of the present application, the power of device1 and device2a uplink to the reader is also related to the distance from the CW node to the device.

[0100] In this case, when the CW is far away from the device, the carrier signal sent by the CW to the device can be small, and the power of the backscattering of the device, i.e., the power of D2R, is also small, so even if the device is actually very close to the reader, it can still be judged as far.

[0101] Based on this, the embodiments of the present application provide a processing scheme for proximity decision, in which the proximity decision is used to determine whether the device is close to the reader, and the reader performs the judgment process. In this scheme, the access network device can make the proximity decision, obtain the proximity indication, and notify the device of the proximity indication. On the one hand, the device can adjust its transmission power according to the proximity indication, for example, when the proximity indication indicates that the distance is close, the device can appropriately reduce the transmission power to reduce the power consumption. When the proximity indication indicates that the distance is far, the device can increase the transmission power to increase the probability of signal reception by the reader.

[0102] In addition, the device can also select access based on the proximity indication, where access selection means that the device decides to access which reader. After the device determines the reader to access, the device can no longer respond to the signals sent by other readers. Therefore, the proximity decision can avoid the device responding to too many inventory, command commands of different readers, save the power consumption of the device and avoid interference to the readers, and the concept of cell-like.

[0103] It should be understood that the embodiments of the present application only exemplarily illustrate several information transmission scenarios, and other information transmission scenarios are not shown.

[0104] The embodiments of the present application can be applied to the following scenarios:

[0105] Indoor & outdoor inventory, indoor & outdoor sensor data acquisition, indoor & outdoor positioning, indoor & outdoor command control, etc.

[0106] The communication method provided by the embodiments of the present application is described in detail below in combination with the accompanying drawings.

[0107] Reference is made to Figure 5 , Figure 4 A schematic interaction diagram of a communication method provided by an embodiment of the present application is shown. Next, each step of the method is described in detail.

[0108] In the embodiments of the present application, the IoT device and the access network device described above are taken as an example of the execution subject of the communication method, and the communication method is described. As an example but not limitation, the execution subject of the communication method can also be a chip corresponding to the IoT device and a chip corresponding to the access network device.

[0109] In S302, the access network device sends a first message to the IoT device.

[0110] The first message is used for the IoT device to determine the resource used when sending a second message to the access network device.

[0111] In the embodiments of the present application, the access network device sends the first message in the form of a radio frequency signal in the case where the IoT device needs to respond. For example, the scenarios where the IoT device needs to respond include the scenarios of inventory, positioning, control management of the IoT device or the material on which the IoT device is arranged, and the scenarios of acquiring temperature and humidity information.

[0112] The resource used by the IoT device when sending the second message comprises a frequency domain resource and a time domain resource. Based on this, the first message can comprise configured frequency domain resources and / or time domain resources, or the first message can comprise parameters for indicating the frequency domain resources and / or the time domain resources, or the first message can comprise a set of frequency domain resources and / or a set of time domain resources for the IoT device to select.

[0113] In an implementation manner, the first message can indicate one or more sets of candidate occasions.

[0114] In an implementation manner, the first message comprises time domain resource indication information, where the time domain resource indication information can be, for example, a time domain indication parameter, and the time domain indication parameter can be one or more.

[0115] Optionally, the time domain resource indication information can indicate a set of candidate occasions, where the set of candidate occasions refers to a set of multiple candidate occasions that are continuous in the time domain.

[0116] Optionally, the time domain resource indication information can indicate one or more sets of candidate occasions.

[0117] Optionally, the multiple sets of candidate occasions can be divided by the access network device based on grouping of multiple IoT devices that establish connections therewith, or based on other division rules. Optionally, the multiple sets of candidate occasions can be divided based on device types of the IoT devices. Optionally, the multiple sets of candidate occasions can be divided based on transmission power intervals of the IoT devices. Optionally, the multiple sets of candidate occasions can be divided based on both device types of the IoT devices and transmission power intervals of the IoT devices.

[0118] In another implementation manner, the first message comprises time domain resource indication information and frequency domain resource indication information. The description about the time domain resource indication information can refer to the above description. The frequency domain resource indication information can be, for example, a frequency domain indication parameter, and the frequency domain indication parameter can be one or more.

[0119] In an implementation manner, the first message can further indicate one or more sets of frequency domain resources.

[0120] Optionally, the frequency domain resource indication information can indicate a set of frequency domain resources, where the set of frequency domain resources refers to a frequency band comprising multiple continuous frequency domain resources.

[0121] Optionally, the frequency domain resource indication information can indicate one or more sets of frequency domain resources.

[0122] Optionally, the multiple frequency domain resource sets can be divided by the access network device based on grouping of the multiple IoT devices with which the connection is established, or based on other division rules. Optionally, the multiple frequency domain resource sets can be divided based on device type of the IoT devices. Optionally, the multiple frequency domain resource sets can be divided based on transmission power interval of the IoT devices. Optionally, the multiple frequency domain resource sets can be divided based on both device type of the IoT devices and transmission power interval of the IoT devices. Optionally, an isolation frequency band can be arranged between the multiple frequency domain resource sets.

[0123] In the embodiments of the present application, the time domain resource indication information and the frequency domain resource indication information included in the first message can be freely set based on requirements.

[0124] For example, the time domain resource indication information included in the first message indicates one time domain indication parameter, and the frequency domain resource indication information indicates multiple frequency domain indication parameters. The multiple frequency domain indication parameters indicate frequency domain resource sets that can be divided based on device type of the IoT devices.

[0125] For another example, the time domain resource indication information included in the first message indicates multiple candidate time set, and the frequency domain resource indication information indicates multiple frequency domain resource sets. The multiple candidate time set can be divided based on device type of the IoT devices, and the multiple frequency domain resource sets can be divided based on transmission power interval of the IoT devices.

[0126] In the embodiments of the present application, the specific implementation of the time domain resource indication information and the frequency domain resource indication information in the first message is not exhaustively listed, and any implementation combination manner belongs to the protection scope of the present scheme.

[0127] In an implementation manner, the access network device can establish a connection with the IoT device before sending the first message to the IoT device. In the embodiments of the present application, S301 can also be included.

[0128] In S301, the access network device sends a paging-like message.

[0129] The paging-like message includes an identifier of the access network device, and the identifier of the access network device is used to trigger the IoT device to determine whether to respond to the first message.

[0130] In the embodiments of the present application, the access network device can send the paging-like message in the form of a radio frequency signal.

[0131] In an implementation manner, the access network device can first send the paging-like message, and then send the first message after receiving a response message of the IoT device to the paging-like message.

[0132] In another implementation, the access network device can first send the paging-like message, but without paying attention to whether the response message of the IoT device is received, and directly send the first message.

[0133] In another implementation, the access network device can synchronously send the paging-like message and the first message.

[0134] In S303, the IoT device determines the target access occasion and the first frequency domain resource in response to the first message sent by the access network device, and sends a second message to the access network device based on the target access occasion and the first frequency domain resource.

[0135] In the embodiments of the present application, after receiving the first message, the IoT device can first determine whether to respond to the first message.

[0136] In one implementation, the IoT device can respond to any received first message without distinction, without paying attention to whether the connection with the access network device is established.

[0137] In another implementation, the IoT device can respond to the first message in the case of establishing the connection with the access network device, and not respond to the first message in the case of not establishing the connection.

[0138] The manner in which the IoT device establishes the connection with the access network device can include:

[0139] The IoT device receives the paging-like message sent by the access network device, and determines whether the access network device matches the IoT device according to the identifier of the access network device carried in the paging-like message. If the access network device matches the IoT device, the IoT device can send a response message to the access network device to establish the connection with the access network device. Alternatively, if the access network device matches the IoT device, the IoT device determines to establish the connection with the access network device by itself without responding to the access network device. If the access network device does not match the IoT device, the connection is not established, and the first message is not responded to.

[0140] The IoT device determines whether the access network device matches the IoT device according to the identifier of the access network device carried in the paging-like message, for example, the IoT device can store a string matching itself, and by comparing whether the identifier of the access network device and the string are consistent or associated, if the two are consistent or associated, it indicates that the access network device matches the IoT device. If the two are not consistent or associated, it indicates that the access network device does not match the IoT device.

[0141] In the embodiments of the present application, when the IoT device determines to respond to the first message, the IoT device can parse the first message to determine the target access occasion and the first frequency domain resource.

[0142] In an implementation, the first message can include configured frequency domain resources and / or time domain resources. In this case, the IoT device can determine the configured time domain resources as the target access occasion and / or the configured frequency domain resources as the first frequency domain resources. The access occasion can refer to a time slot.

[0143] In another implementation, the IoT device can determine a candidate occasion set according to the first message, and then determine the target access occasion from the candidate occasion set. Meanwhile, the IoT device can select any available frequency domain resource as the first frequency domain resource based on its own working frequency band.

[0144] For example, the first message indicates a candidate occasion set, which can be represented as [slot0~slot3], and the IoT device can select slot2 as the target access occasion from [slot0~slot3].

[0145] In another implementation, the first message indicates multiple occasion sets, and the access network device can perform group management on the IoT devices. Different occasion sets correspond to IoT devices in different groups. The IoT device can determine a candidate occasion set from the multiple occasion sets according to the group to which the IoT device belongs.

[0146] In another implementation, the IoT device can determine a candidate occasion set according to the first message, the device type of the IoT device, and / or the maximum transmit power of the IoT device, and then determine the target access occasion from the candidate occasion set. Meanwhile, the IoT device can select any available frequency domain resource as the first frequency domain resource based on its own working frequency band.

[0147] For example, the first message indicates multiple occasion sets, which are divided based on the device type and / or the transmit power interval. Then, the IoT device can determine a candidate occasion set from the first message based on its own device type and / or maximum transmit power.

[0148] In another implementation, the first message includes time domain resource indication information, which indicates one or more candidate occasion sets. The multiple candidate occasion sets indicated by the time domain resource indication information can be divided based on the device type and / or the transmit power interval.

[0149] The IoT device can determine a target candidate occasion set from the one or more candidate occasion sets according to its own device type and / or maximum transmit power, and then determine the target access occasion from the target candidate occasion set. Meanwhile, the IoT device can select any available frequency domain resource as the first frequency domain resource based on its own working frequency band.

[0150] Optionally, the time domain resource indication information can be a parameter value. The IoT device can calculate the parameter value based on a pre-set rule to determine one or more candidate occasion sets indicated by the time domain resource indication information.

[0151] For example, the parameter value corresponding to the time domain resource indication information is 2, and the 2 candidate occasion sets, e.g., [slot0~slot3][slot4~slot8], can be determined by calculating the time domain indication parameter based on the pre-set rule. Then the IoT device can select one of the 2 candidate occasion sets as the target candidate occasion set according to its device type and / or maximum transmission power.

[0152] For another example, the parameter value corresponding to the time domain resource indication information is 2A, and the 2 candidate occasion sets, e.g., [slot0~slot3][slot4~slot8], can be determined by calculating the time domain indication parameter based on the pre-set rule. A indicates that the 2 candidate occasion sets are divided based on the device type, and thus the IoT device can select one of the 2 candidate occasion sets as the target candidate occasion set based on its device type.

[0153] Optionally, the time domain resource indication information can include multiple time domain indication parameters, and the time domain indication parameters are used to determine one or more candidate occasion sets.

[0154] The IoT device determines a target time domain indication parameter from the multiple time domain indication parameters according to the device type and / or maximum transmission power of the IoT device, the target time domain indication parameter includes two adjacent time domain indication parameters; determines a time domain range according to the target time domain indication parameter, and determines a target candidate occasion set according to the time domain range.

[0155] For example, the multiple time domain indication parameters are represented by Q1, Q2, and Q3, respectively, wherein each time domain indication parameter is divided based on the device type and / or transmission power interval. For example, Q1 corresponds to a first device type, Q2 corresponds to a second device type, and Q3 corresponds to a third device type.

[0156] When the device type of the IoT device is the first device type, the IoT device can select a target time domain indication parameter (Q1) from the 3 time domain indication parameters, and then calculate, for example, [0, 2 Q1 ), according to Q1, wherein 2 Q1 indicates the candidate occasion number, and the target candidate occasion set is composed of 0 to 2 Q1 candidate occasions in the time domain interval.

[0157] When the device type of the IoT device is the second device type, the IoT device can select a target time domain indication parameter (Q1, Q2) from the 3 time domain indication parameters, at this time, the target time domain indication parameter includes two adjacent time domain indication parameters, and then a time domain interval is calculated for the target time domain indication parameter, for example, [2 Q1 , 2 Q2 ), based on 2 Q1 to 2 Q2 candidate time occasions in the time domain interval to form a target candidate time occasion set.

[0158] On the basis of the above-mentioned embodiments, in the embodiments of the present application, the IoT device can further determine a candidate time occasion set and a frequency domain resource set according to the first message, and then determine a target access time occasion from the candidate time occasion set and a first frequency domain resource from the frequency domain resource set.

[0159] The content that the IoT device determines the candidate time occasion set according to the first message can be referred to the description above, and will not be described here.

[0160] In the embodiments of the present application, the process that the IoT device determines the frequency domain resource set according to the first message can include the following implementation manners:

[0161] In one implementation manner, the IoT device can determine the frequency domain resource set according to the first message, and then determine the first frequency domain resource from the frequency domain resource set. At the same time, the IoT device can determine the target access time occasion by using any one of the implementation manners disclosed above.

[0162] Among them, the first message can directly indicate a frequency domain resource set, and the frequency domain resource set can be represented as [f1-f8], where f1 and f8 represent 8 frequency domain resources, and then the IoT device can select one from [f1-f8] as the first frequency domain resource.

[0163] In another implementation manner, the first message indicates a plurality of frequency domain sets, and the access network device can perform grouping management on the IoT devices, and different frequency domain sets correspond to the IoT devices in different groups. The IoT device can determine the frequency domain resource set from the plurality of frequency domain sets according to the group to which the IoT device belongs.

[0164] In another implementation manner, the IoT device can determine the frequency domain resource set according to the first message, the device type of the IoT device and / or the maximum transmission power, and then determine the first frequency domain resource from the frequency domain resource set.

[0165] For example, the first message indicates a plurality of frequency domain sets, and the plurality of frequency domain sets are divided based on the device type and / or the transmission power interval, and then the IoT device can determine the frequency domain resource set from the first message based on the device type and / or the maximum transmission power of the IoT device.

[0166] In another implementation, the first message comprises frequency domain resource indication information, the frequency domain resource indication information indicating one or more frequency domain resource sets. The one or more frequency domain resource sets indicated by the frequency domain resource indication information can be divided based on device type and / or transmit power interval.

[0167] The IoT device can determine a target frequency domain resource set from the one or more frequency domain resource sets according to the device type and / or maximum transmit power of the IoT device; and then determine the first frequency domain resource from the target frequency domain resource set.

[0168] Optionally, the frequency domain resource indication information can be a parameter value. The IoT device can calculate the parameter value based on a pre-set rule to determine the one or more frequency domain resource sets indicated by the frequency domain resource indication information.

[0169] For example, the parameter value corresponding to the frequency domain resource indication information is 4. The four frequency domain resource sets, for example, [f1-f8], [f9-f16], [f17-f24] and [f25-f32], can be determined by calculating the frequency domain indication parameter according to the pre-set rule. Then the IoT device can select one of the four frequency domain resource sets as the target frequency domain resource set according to the device type and / or maximum transmit power of the IoT device.

[0170] For another example, the parameter value corresponding to the frequency domain resource indication information is 3B. The three frequency domain resource sets, for example, [f1-f8], [f9-f16] and [f17-f24], can be determined by calculating the frequency domain indication parameter according to the pre-set rule. B indicates that the three frequency domain resource sets are divided based on transmit power interval. Therefore, the IoT device can select one of the three frequency domain resource sets as the target frequency domain resource set based on the transmit power interval in which the maximum transmit power of the IoT device is located.

[0171] Optionally, the frequency domain resource indication information can comprise a plurality of frequency domain indication parameters, the frequency domain indication parameters being used to determine the one or more frequency domain resource sets.

[0172] The IoT device determines a target frequency domain indication parameter from the plurality of frequency domain indication parameters according to the device type and / or maximum transmit power of the IoT device, the target frequency domain indication parameter comprising two adjacent frequency domain indication parameters; determines a frequency domain range according to the target frequency domain indication parameter, and determines a target frequency domain resource set according to the frequency domain range.

[0173] For example, the multiple frequency domain indication parameters are respectively denoted as f1, f2, f3, wherein each frequency domain indication parameter is based on the device type and / or the transmission power interval division. For example, the transmission power interval corresponding to f1 is denoted as class1, the transmission power interval corresponding to f2 is denoted as class2, and the transmission power interval corresponding to f3 is denoted as class3.

[0174] When the transmission power interval in which the maximum transmission power of the IoT device is located is class3, the IoT device can select a target frequency domain indication parameter (f2, f3) from the three frequency domain indication parameters, and then calculate a frequency resource interval according to (f2, f3), for example, [rb1, rb2). Based on the frequency resource interval, i.e., the target frequency domain resource set, the IoT device can determine the first frequency resource from the target frequency domain resource set [rb1, rb2).

[0175] In the embodiments of the present application, after the IoT device determines the target access occasion and the first frequency resource, the IoT device can send a second message to the access network device based on the target access occasion and the first frequency resource at the maximum transmission power of the IoT device.

[0176] In the embodiments of the present application, the content carried in the second message is different in different cases.

[0177] In one implementation manner, the second message includes the first identifier.

[0178] In another implementation manner, the second message includes the first identifier and first information, wherein the first information includes the device type and / or the maximum transmission power of the IoT device, and the maximum transmission power can also refer to the power interval in which the maximum transmission power is located.

[0179] That is, the first information can also include the device type of the IoT device and / or the power interval in which the maximum transmission power is located. The power interval reporting manner occupies fewer bits, and can save the resource overhead of the second message.

[0180] The first identifier is related to the identifier of the IoT device, and the first identifier can be determined based on the identifier of the IoT device.

[0181] If the first message indicates multiple candidate occasion sets and / or multiple frequency domain resource sets, or the time domain resource indication information included in the first message indicates multiple candidate occasion sets and / or the frequency domain resource indication information included in the first message indicates multiple frequency domain resource sets, or the time domain indication parameter included in the time domain resource indication information indicates multiple candidate occasion sets and / or the frequency domain indication parameter included in the frequency domain resource indication information indicates multiple frequency domain resource sets, the second message can only include the first identifier.

[0182] This is because, in these cases, the access network device has pre-configured the corresponding device type and / or transmission power interval for each candidate occasion set, and thus, when the IoT device sends the second message based on the target access occasion and / or the first frequency resource, the device type and / or the transmission power interval in which the maximum transmission power of the IoT device is located has been implicitly indicated. Therefore, the IoT device can not need to carry the first information in the second message.

[0183] In another implementation, if the first message indicates only one candidate occasion set and / or one frequency domain resource set, or the time domain resource indication information included in the first message indicates one candidate occasion set and / or one frequency domain resource set, or the time domain indication parameter included in the time domain resource indication information indicates one candidate occasion set and / or the frequency domain indication parameter included in the frequency domain resource indication information indicates one frequency domain resource set, the second message needs to report the first information and the first identifier to the access network device.

[0184] In S304, the access network device sends a third message to the IoT device based on the second message.

[0185] The third message is used by the IoT device to determine the frequency resource and power used when sending a fourth message to the access network device.

[0186] In the embodiments of the present application, the access network device needs to parse the second message after receiving the second message. In actual application, one access network device can correspond to multiple IoT devices, and the multiple IoT devices can send the second message in the same time domain resource and frequency domain resource. In this case, the access network device may fail to parse the second message.

[0187] When the access network device fails to parse, it cannot identify the IoT device that sends the second message, thereby causing the IoT device to fail to access. Correspondingly, the access network device also does not need to send the third message.

[0188] In the embodiments of the present application, when the access network device parses the second message and succeeds, the access network device can obtain the first identifier, which is used to indicate the identity of the IoT device. When the access network device sends the fourth message, the first identifier is attached in the fourth message, so as to enable the IoT device to identify the resource configured by the access network device in the fourth message.

[0189] In the embodiments of the present application, in the case that the second message comprises the first identifier, the access network device can obtain at least one of the access occasion, the transmission power and the transmission frequency used by the IoT device when sending the second message in the process of receiving the second message, and then the access network device can determine the device type and / or the maximum transmission power of the IoT device according to the at least one of the access occasion, the transmission power and the transmission frequency, and then generate the third message according to the device type and / or the maximum transmission power of the IoT device.

[0190] Optionally, the access network device can determine the device type and / or the maximum transmission power of the IoT device in combination with the first message and the obtained at least one of the access occasion, the transmission power and the transmission frequency.

[0191] In the embodiments of the present application, in the case that the second message comprises the first identifier and the first information, the access network device can generate the third message according to the device type and / or the maximum transmission power contained in the first information.

[0192] Optionally, the third message comprises at least one of proximity indication information, frequency domain resource information and power control information; the proximity indication is used to represent the distance between the IoT device and the access network device. The frequency domain resource information comprises any one of a frequency interval, a frequency value and a frequency offset. The power control information further comprises any one of a power interval, a power value and a power change amount.

[0193] In the embodiments of the present application, the process that the access network device generates the third message according to the device type and / or the maximum transmission power of the IoT device can comprise: the access network device can determine the proximity indication according to the maximum transmission power of the IoT device or the transmission power interval in which the maximum transmission power of the IoT device is located. And / or the access network device can determine the frequency domain resource information according to the transmission power corresponding to the second messages respectively received based on adjacent frequency domain resources within the same access occasion. And / or the access network device can determine the power control information based on the actual transmission power corresponding to the second messages respectively received based on adjacent frequency domain resources within the same access occasion. Then the access network device can generate the third message according to at least one of the proximity indication information, the frequency domain resource information and the power control information.

[0194] It should be noted that the access network device can receive the second messages sent by multiple IoT devices, for example, there are three IoT devices, which are represented as IoT1, IoT2 and IoT3 respectively, wherein the device type of IoT1 is the second type, the maximum transmission power is 5dbm, and the transmission frequency point is rb2; the device type of IoT2 is the second type, the maximum transmission power is 10dbm, and the transmission frequency point is rb1; the device type of IoT3 is the third type, the maximum transmission power is 20dbm, and the transmission frequency point is rb3. Wherein rb1, rb2 and rb3 are consecutive adjacent frequency points.

[0195] In this case, the second message sent by IoT1 and the fourth message that may be sent in the future are easily interfered by the second message sent by IoT3. In this case, the access network device can manage the power of IoT3 and / or IoT1 through the power control information to reduce the possibility of interference. The access network device can adjust the power of IoT3 and IoT1 when sending the fourth message through the power control information and / or the proximity indication in the third message. In this scheme, the IoT devices using adjacent frequency resources in the access process are close in power through power control, interference is avoided, and the access success rate is improved.

[0196] Optionally, the third message can be a message including resource configurations required by multiple IoT devices.

[0197] Optionally, the third message can include multiple messages, each message independently corresponding to a resource configuration required by an IoT device.

[0198] In the embodiments of the present application, the access network device needs to reply to the third message for multiple IoT devices, and the corresponding information of each IoT device includes the proximity indication, the frequency domain resource information used by the subsequent message (for example, the fourth message), and the power control information.

[0199] In this case,

[0200] 1. The proximity indication can be near, far, or no need to respond again. When not responding, the frequency domain resource information and the power control information are not needed.

[0201] 2. The frequency domain resource information is used to indicate the frequency domain resource used by the subsequent message (for example, the fourth message).

[0202] 3. The power control information can be a power interval indication or a delta power (bound with the device type). The delta power can be bound with the device type. The power control information can also not be sent, and the IoT device can adjust the transmission power of the subsequent message according to the proximity indication.

[0203] In S305, the IoT device determines the second frequency resource and the target power based on the third message sent by the access network device, and sends the fourth message to the access network device based on the second frequency resource and the target power.

[0204] In this case, the fourth message includes a second identifier, and the second identifier can be an identity of the IoT device.

[0205] In the embodiment of the present application, the access network device will send a third message to the IoT device in the case that the second message sent by the IoT device is correctly parsed. In this case, the IoT device can receive the third message.

[0206] In the case that the access network device cannot parse the second message sent by the IoT device, the access network device will not send a third message to the IoT device. In this case, the IoT device needs to wait for the next first message sent by the access network device, that is, re-enter the next access process, as shown in (b) of the above S302 and S303, until the third message is received. Figure 4

[0207] In the embodiment of the present application, the process in which the IoT device determines that the third message is received includes: the IoT device parses the received third message, and if the first identifier corresponding to the IoT device is found from the parsing result, it is determined that the third message is received. If the first identifier corresponding to the IoT device is not found from the parsing result, it means that the third message is not received.

[0208] In the embodiment of the present application, the IoT device can determine the target power based on the proximity indication information and / or power control information; and / or, the IoT device can determine the second frequency resource based on the frequency domain resource information.

[0209] In the embodiment of the present application, the IoT device can adjust the IoT transmit power to the target power on the second frequency resource (specified frequency resource) at the target access opportunity, so as to send a fourth message.

[0210] In another implementation scheme, the proximity indication can be near, far, or no longer respond, and when there is no response, there is no need for frequency resource and power control indication. The IoT device can determine according to the proximity indication. If it is determined that there is another more proximate access network device, the IoT device can report a no longer access request (similar to deregistration) to the access network device far away. After receiving the request, the access network device far away can confirm the no longer access request. In this way, the IoT device can no longer access the access network device far away.

[0211] In this implementation scheme, the IoT device selects a suitable access network device to access, saves power consumption, realizes a small cell effect, and improves system capacity.

[0212] ​In the embodiment of the application, the access network device sends a first message to the IoT device; the IoT device determines a target access occasion and a first frequency domain resource in response to the first message, and sends a second message to the access network device based on the target access occasion and the first frequency domain resource; the access network device generates a third message based on the second message and sends the third message to the IoT device; the IoT device determines a second frequency resource and / or a target power according to the third message, and sends a fourth message to the access network device based on the second frequency resource and / or the target power. The fourth message carries an IoT device identifier. In the scheme, the access network device can configure transmission resources for different IoT devices, so that conflicts or interferences that may exist in the uplink transmission process of each IoT device can be avoided in the configuration stage. Therefore, the IoT device is less likely to conflict or interfere with other IoT devices when sending the second message or the fourth message, and the connection success rate of the IoT device and the access network device is improved.

[0213] The embodiments of the application will be described below in combination with application scenarios.

[0214] Implementation scheme one

[0215] Please refer to Figure 5 , Figure 6 A signaling interaction diagram of a communication method is shown, and the method comprises the following steps:

[0216] In step 401, the access network device sends a paging-like message.

[0217] The paging-like message carries an identifier of the access network device.

[0218] In step 402, the IoT device receives the paging-like message and confirms that it matches the access network device.

[0219] In step 403, the access network device sends a first message.

[0220] The first message is used for the IoT device to determine resources used when sending a second message to the access network device.

[0221] The first message includes a time domain indication parameter, and the time domain indication parameter is one.

[0222] In step 404, the IoT device receives the first message, determines a target access occasion and a first frequency domain resource according to the first message, and sends the second message to the access network device based on the target access occasion and the first frequency domain resource.

[0223] The second message includes a first identifier and first information, and the first information includes a device type and / or a maximum transmission power of the IoT device. The first information can also include a transmission power interval in which the device type and / or the maximum transmission power of the IoT device is located.

[0224] At step 405, the access network device receives the second message, and determines a third message according to the second message.

[0225] The third message includes at least one of proximity indication information, frequency domain resource information, and power control information.

[0226] At step 406, the IoT device determines a second frequency resource and a target power according to the third message, and transmits a fourth message according to the second frequency resource and the target power.

[0227] In the embodiments of the present application, the IoT device carries the first information in the second message, so that the access network device can allocate frequency resources and perform power control for the IoT device in the third message. In subsequent message transmission, the IoT device adjusts the power based on the specified frequency resources, and reports the fourth message in the target access time slot, thereby completing the access to the access network device.

[0228] Implementation scheme two

[0229] Please refer to Figure 5 and Figure 6 , Figure 5 a signaling interaction diagram of a communication method is shown, Figure 5 an access flow diagram is shown.

[0230] As shown in (a) in Figure 6 , in one access flow, the communication method includes the following steps.

[0231] At step 501, the access network device transmits a paging-like message.

[0232] The paging-like message carries an identifier of the access network device.

[0233] At step 502, the IoT device receives the paging-like message and confirms the matching with the access network device.

[0234] At step 503, the access network device transmits a first message.

[0235] The first message is used by the IoT device to determine the resource used when transmitting a second message to the access network device;

[0236] The first message indicates a plurality of candidate opportunity sets, and the plurality of candidate opportunity sets are divided based on the device type and / or the transmission power interval of the IoT device.

[0237] At step 504, the IoT device receives the first message, determines a target access opportunity and a first frequency domain resource according to the first message, and transmits the second message to the access network device based on the target access opportunity and the first frequency domain resource.

[0238] The second message includes the first identifier.

[0239] The IoT device determines a target access occasion and / or a first frequency domain resource from a plurality of candidate occasion sets according to a device type and / or a maximum transmission power.

[0240] At step 505, the access network device receives the second message and determines the third message according to the second message.

[0241] The third message includes at least one of proximity indication information, frequency domain resource information, and power control information.

[0242] In the process of receiving the second message, the access network device probes the access occasion, the frequency domain resource, and the transmission power used by the second message. The third message is determined according to the access occasion, the frequency domain resource, and the transmission power used by the second message.

[0243] At step 506, the IoT device determines a second frequency resource and a target power according to the third message, and transmits a fourth message according to the second frequency resource and the target power.

[0244] It should be noted that in the embodiments of the present application, the access procedure includes multiple, such as Figure 7 As shown in (b) of FIG. 6, there are multiple access procedures for the IoT device that fails to access in the previous access procedure to access again.

[0245] In the embodiments of the present application, after receiving the fourth message, the access network device presents a result as shown in Figure 8 In slot1, 4 IoT devices of a first type or with a maximum transmission power greater than a preset first power threshold are accessed. In slotX, 4 IoT devices of a second type or with a maximum transmission power less than a preset second power threshold are accessed. The second power threshold is less than the first power threshold.

[0246] In the present scheme, one round includes multiple occasions (slots), and the access network device can indicate multiple Q values (Q1, Q2, Q3) according to the device type and the maximum transmission power interval of the IoT device. The IoT device can randomly select a slot to transmit in the time domain interval according to the device type and / or the maximum transmission power (or the maximum transmission power interval), such as [2 Q1 , 2 Q2 ).

[0247] The present scheme achieves an effect similar to the following: different IoT devices access the access network device in different time domain resources (slots) according to the device type and the size of the maximum transmission power.

[0248] It should be noted that the scheme can be extended to use different rounds in the embodiments of the present application.

[0249] For example, different rounds configure specific device types and / or specific transmission power intervals. After receiving the first message, the IoT device determines whether to respond to the first message according to its own device type and / or maximum transmission power (or interval).

[0250] If the device type and / or maximum transmission power (or interval) of the IoT device itself matches the specific device type and / or specific transmission power interval corresponding to the round in the first message, the first message is responded to. If not, the next first message is continued to be waited for.

[0251] Implementation scheme three

[0252] Please refer to Figure 7 and Figure 8 , Figure 8 a signaling interaction diagram of a communication method is shown, Figure 9 an access flow diagram is shown.

[0253] Step 701, the access network device sends a class paging message.

[0254] The class paging message carries the identifier of the access network device.

[0255] Step 702, the IoT device receives the class paging message and confirms the matching with the access network device.

[0256] Step 703, the access network device sends a first message.

[0257] The first message is used for the IoT device to determine the resource used when sending a second message to the access network device;

[0258] The first message indicates a plurality of frequency domain resource sets. The plurality of frequency domain resource sets are divided based on the device type and / or transmission power interval of the IoT device.

[0259] Step 704, the IoT device receives the first message, determines the target access occasion and the first frequency domain resource according to the first message, and sends the second message to the access network device based on the target access occasion and the first frequency domain resource.

[0260] The second message includes a first identifier.

[0261] The IoT device determines the target access occasion and / or the first frequency domain resource from the plurality of frequency domain resource sets according to the device type and / or maximum transmission power.

[0262] Step 705, the access network device receives the second message and determines a third message according to the second message.

[0263] The third message comprises at least one of proximity indication information, frequency domain resource information, and power control information.

[0264] In the process of receiving the second message, the access network device probes the access occasion, the frequency domain resource, and the transmission power used by the second message. The third message is determined according to the access occasion, the frequency domain resource, and the transmission power used by the second message.

[0265] In step 706, the IoT device determines the second frequency resource and the target power according to the third message, and transmits a fourth message according to the second frequency resource and the target power.

[0266] In the embodiments of the present application, one round includes multiple occasions (slots), and each occasion includes multiple frequency resources. The access network device can indicate multiple frequency resource intervals (rbl, rb2, rb3) according to the device type and the maximum transmission power interval of the IoT device. The IoT device can randomly select a frequency resource in the frequency resource interval according to the device type and / or the maximum transmission power (or the maximum transmission power interval) for transmission, such as rbl, rb2.

[0267] In the embodiments of the present application, after receiving the fourth message, the access network device presents a result as shown in Figure 9 The scheme achieves an effect similar to the following: Different IoT devices access different frequency domain resources (rb) according to the device type and the size of the maximum transmission power, wherein the device type and the maximum transmission power of the four IoT devices accessing in slot1 are not the same, and the device type and the maximum transmission power of the four IoT devices accessing in slotX are not the same.

[0268] Implementation scheme four

[0269] Please refer to Figure 10 to Figure 11 , Figure 10 A signaling interaction diagram of a communication method is shown.

[0270] In step 901, the access network device transmits a paging-like message.

[0271] The paging-like message carries the identifier of the access network device.

[0272] In step 902, the IoT device receives the paging-like message and confirms the matching with the access network device.

[0273] In step 903, the access network device transmits a first message.

[0274] The first message is used for the IoT device to determine resources used when sending the second message to the access network device;

[0275] The first message indicates a plurality of candidate occasion sets and a plurality of frequency domain resource sets. The plurality of frequency domain resource sets are divided based on a device type and / or a maximum transmission power interval of the IoT device, and the plurality of candidate occasion sets are divided based on the device type and / or the maximum transmission power interval of the IoT device.

[0276] At step 904, the IoT device receives the first message, determines a target access occasion and a first frequency domain resource according to the first message, and sends a second message to the access network device based on the target access occasion and the first frequency domain resource.

[0277] The second message includes the first identifier.

[0278] The IoT device determines the target access occasion and / or the first frequency domain resource from the plurality of candidate occasion sets and the plurality of frequency domain resource sets according to the device type and / or the maximum transmission power.

[0279] At step 905, the access network device receives the second message and determines a third message according to the second message.

[0280] The third message includes at least one of proximity indication information, frequency domain resource information, and power control information.

[0281] In the process of receiving the second message, the access network device detects the access occasion, the frequency domain resource, and the transmission power used by the second message. According to the access occasion, the frequency domain resource, and the transmission power used by the second message, the third message is determined.

[0282] At step 906, the IoT device determines a second frequency resource and a target power according to the third message, and sends a fourth message according to the second frequency resource and the target power.

[0283] In an embodiment of the present application, one round includes a plurality of occasions (slots), and each occasion includes a plurality of frequency resources. The access network device can indicate a plurality of Q values (Q1, Q2, Q3) according to the device type and the maximum transmission power interval of the IoT device, and the access network device can indicate a plurality of frequency resource intervals (rbl, rb2, rb3) according to the device type and the maximum transmission power interval of the IoT device.

[0284] The IoT device can randomly select a slot in the time domain interval according to the device type and / or the maximum transmission power (or the maximum transmission power interval) to send, such as [2 Q1 ,2 Q2) randomly selects slot transmission. And can be according to the device type and / or maximum transmit power (or maximum transmit power interval) in the frequency resource interval randomly select frequency resource transmission, such as [rb1, rb2) randomly select rb transmission.

[0285] It can be understood that, in order to realize the functions in the above embodiments, the IoT device and the access network device comprise the hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and method steps of each example described in the embodiments disclosed in the present application, the present application can be realized in the form of hardware or hardware and computer software. Whether a certain function is executed in hardware or computer software driven hardware depends on the specific application scenario and design constraints of the technical solution.

[0286] Figure 3 The structural schematic diagram of the possible communication device provided for the embodiments of the present application. These communication devices can be used to realize the functions of the IoT device or the access network device in the above method embodiments, and thus can also realize the beneficial effects possessed by the above method embodiments.

[0287] As Figure 11 shown, the IoT device 1000 comprises a processing unit 1001 and a transceiver unit 1002. The IoT device 1000 is used to realize the functions of the IoT device in the above embodiments.

[0288] When the IoT device 1000 is used for the functions in the above communication method: receiving a first message from the access network device, the first message is used for the IoT device to determine the resource used when sending a second message to the access network device; determining a target access occasion and a first frequency domain resource in response to the first message sent by the access network device, and sending the second message to the access network device based on the target access occasion and the first frequency domain resource, wherein the second message comprises a first identifier, or comprises the first identifier and first information, and the first information comprises the device type and / or maximum transmit power of the IoT device; receiving a third message sent by the access network device, the third message is used for the IoT device to determine the frequency resource and power used when sending a fourth message to the access network device; the third message is determined by the access network device based on the second message; determining a second frequency resource and / or target power based on the third message sent by the access network device, and sending the fourth message to the access network device based on the second frequency resource and / or target power.

[0289] For more detailed description of the above processing unit 1001 and transceiver unit 1002, please refer to the method shown in Figure 3 , which will not be repeated here.

[0290] As Figure 3As shown, the access network device 1100 includes a processing unit 1101 and a transceiver unit 1102. The access network device 1100 is configured to implement the method shown in Figure 3 .

[0291] When the access network device 1100 is configured to implement the functions in the method embodiment shown in ​ , it sends a first message to an IoT device, the first message is used for the IoT device to determine the resource used when sending a second message to the access network device; receives the second message sent by the IoT device in response to the first message, wherein the second message includes a first identifier, or includes the first identifier and first information, the first information includes the device type and / or the maximum transmit power of the IoT device; sends a third message to the IoT device based on the second message, the third message is used for the IoT device to determine the frequency resource and power used when sending a fourth message to the access network device; receives the fourth message sent by the IoT device based on the second frequency resource and the target power determined by the third message.

[0292] More detailed descriptions about the processing unit 1101 and the transceiver unit 1102 can be directly obtained by referring to the related descriptions in the method embodiment shown in ​ , and will not be repeated here.

[0293] The present application also provides a computer readable storage medium, the computer readable storage medium stores a computer program, the computer program includes program instructions, when the program instructions are executed, the communication method is realized.

[0294] The present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code runs on the computer, so that the computer executes the communication method.

[0295] It can be understood that the processor in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor can be a microprocessor, or any conventional processor.

[0296] The method steps in the embodiments of the present application can be realized by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, which can be stored in a random access memory (RAM), a flash memory, a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a network device or a terminal. Of course, the processor and the storage medium can also exist as discrete components in a network device or a terminal.

[0297] In the above embodiments, all or part of the embodiments can be realized by software, hardware, firmware, or any combination thereof. When realized by software, all or part of the embodiments can be realized in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When loaded and executed by a computer, all or part of the processes or functions described in the embodiments of the present application are performed. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer program or instructions can be stored in a computer-readable storage medium or transmitted by the computer-readable storage medium. The computer-readable storage medium can be any available medium accessible by a computer or a data storage device such as a server integrated with one or more available media. The available medium can be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; an optical medium, such as a DVD; or a semiconductor medium, such as a solid state disk (SSD).

[0298] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be mutually referred to if there is no special description and no logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0299] In the present application, "at least one" means one or more, "multiple" means two or more. The "and / or" describes the relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. In the textual description of the present application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship; in the formula of the present application, the character " / " indicates that the associated objects before and after are in a "division" relationship.

[0300] It can be understood that various numerical numbers involved in the embodiments of the present application are only distinguished for the convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial number of each process does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic.

Claims

1. A communication method, characterized in that, The method is applied to IoT devices, and the method includes: Receive a first message, the first message being the resources used by the IoT device when sending a second message; In response to the first message, a second message is sent, wherein the second message includes a first identifier, or includes the first identifier and first information, wherein the first information includes the device type and / or maximum transmit power of the IoT device; A third message is received, which is used to determine the frequency resources and power used by the IoT device when sending the fourth message; the third message is determined by the access network device based on the second message. Based on the third message, a second frequency resource and / or target power are determined, and a fourth message is sent based on the second frequency resource and / or the target power.

2. The method according to claim 1, characterized in that, The response to the first message to send the second message includes: Based on the first message, the device type of the IoT device, and / or the maximum transmit power, a candidate timing set consisting of multiple candidate timings is determined. The target access timing is determined from the candidate timing set, and the second message is sent based on the target access timing.

3. The method according to claim 1, characterized in that, The first message includes time-domain resource indication information, which indicates one or more candidate timing sets. The step of sending a second message in response to the first message includes: The target candidate timing set is determined from the one or more candidate timing sets based on the device type and / or maximum transmit power of the IoT device; The target access timing is determined from the target candidate timing set, and the second message is sent based on the target access timing.

4. The method according to claim 2 or 3, characterized in that, The candidate timing set is a set of multiple candidate timings that are consecutive in the time domain.

5. The method according to claim 3 or 4, characterized in that, The time-domain resource indication information includes multiple time-domain indication parameters, which are used to determine one or more candidate timing sets. The step of determining the target candidate timing set from the one or more candidate timing sets based on the device type and / or maximum transmit power of the IoT device includes: The target time domain indication parameter is determined from a plurality of time domain indication parameters based on the device type and / or maximum transmit power of the IoT device; The time domain range is determined based on the target time domain indication parameters, and the target candidate timing set is determined based on the time domain range.

6. The method according to any one of claims 1-5, characterized in that, The response to the first message to send the second message includes: Based on the first message, the device type and / or maximum transmit power of the IoT device, a set of frequency domain resources consisting of multiple candidate frequency domain resources is determined. The first frequency domain resource is determined from the set of frequency domain resources, and the second message is sent based on the first frequency domain resource.

7. The method according to claim 6, characterized in that, The first message includes frequency domain resource indication information, which indicates one or more frequency domain resource sets. The step of sending a second message in response to the first message includes: The target frequency domain resource set is determined from the one or more frequency domain resource sets based on the device type and / or maximum transmit power of the IoT device; The first frequency domain resource is determined from the target frequency domain resource set, and the second message is sent based on the first frequency domain resource.

8. The method according to claim 6 or 7, characterized in that, The frequency domain resource set is a collection of multiple frequency domain resources that are consecutive in the frequency domain.

9. The method according to claim 7 or 8, characterized in that, The frequency domain resource indication information includes multiple frequency domain indication parameters, which are used to determine one or more frequency domain resource sets. Determining the target frequency domain resource set from the one or more frequency domain resource sets based on the device type and / or maximum transmit power of the IoT device includes: The target frequency domain indication parameter is determined from a plurality of frequency domain indication parameters based on the device type and / or maximum transmit power of the IoT device; The frequency domain range is determined based on the target frequency domain indication parameters, and the target frequency domain resource set is determined based on the frequency domain range.

10. The method according to claim 1, characterized in that, The third message includes at least one of proximity indication information, frequency domain resource information, and power control information; the proximity indication is used to characterize the communication distance between the IoT device and the access network device; determining the second frequency resource and / or target power based on the third message includes: The target power is determined based on the proximity indication information and / or the power control information; and / or The second frequency resource is determined based on the frequency domain resource information.

11. The method according to any one of claims 10, characterized in that, The frequency domain resource information includes any one of frequency range, frequency value, and frequency offset.

12. The method according to any one of claims 10-11, characterized in that, The power control information also includes any one of the following: power range, power value, and power change.

13. The method according to any one of claims 1-12, characterized in that, The method further includes responding before the second message is sent from the first message: Receive a paging-like message from the access network device, the paging-like message including the identifier of the access network device; Whether to respond to the first message is determined based on the identifier of the access network device.

14. A communication method, characterized in that, The method is applied to an access network device, and the method includes: Send a first message, which is used by the IoT device to send a second message; Receive a second message, which is sent by the IoT device in response to the first message. The second message includes a first identifier, or includes the first identifier and first information, whereby the first information includes the device type and / or maximum transmit power of the IoT device. In response to the second message, a third message is sent, the third message being used by the IoT device to determine the frequency resources and power to use when sending a fourth message to the access network device; A fourth message is received, which is sent by the IoT device based on a second frequency resource and / or a target power, wherein the second frequency resource and / or the target power is determined by the IoT device based on the third message.

15. The method according to claim 14, characterized in that, The target access timing is determined by the IoT device from a candidate timing set, which is determined by the IoT device based on the first message, the device type of the IoT device, and / or the maximum transmit power. The candidate timing set includes multiple candidate timings.

16. The method according to claim 14, characterized in that, The first message includes time-domain resource indication information, which indicates one or more candidate timing sets. The target access timing is determined by the IoT device from the target candidate timing set, which is determined by the IoT device from the one or more candidate timing sets based on the IoT device's device type and / or maximum transmit power.

17. The method according to claim 15 or 16, characterized in that, The candidate timing set is a set of multiple candidate timings that are consecutive in the time domain.

18. The method according to claim 16 or 17, characterized in that, The time-domain resource indication information includes multiple time-domain indication parameters, which are used to determine one or more candidate timing sets. The target candidate timing set is determined by the IoT device based on the time-domain range determined by the target time-domain indication parameter. The target time-domain indication parameter is determined by the IoT device from multiple time-domain indication parameters according to the device type and / or maximum transmit power of the IoT device.

19. The method according to any one of claims 14-18, characterized in that, The first frequency domain resource is determined by the IoT device from a set of frequency domain resources. The set of frequency domain resources is determined by the IoT device based on the first message, the device type of the IoT device, and / or the maximum transmit power. The set of frequency domain resources includes multiple candidate frequency domain resources.

20. The method according to claim 19, characterized in that, The first message includes frequency domain resource indication information, which indicates one or more frequency domain resource sets. The first frequency domain resource is determined by the IoT device from the target frequency domain resource set, which is determined by the IoT device from the one or more frequency domain resource sets based on the IoT device's device type and / or maximum transmit power.

21. The method according to claim 19 or 20, characterized in that, The frequency domain resource set is a collection of multiple frequency domain resources that are consecutive in the frequency domain.

22. The method according to claim 20 or 21, characterized in that, The frequency domain resource indication information includes multiple frequency domain indication parameters, which are used to determine one or more frequency domain resource sets. The target frequency domain resource set is determined by the IoT device based on the target frequency domain indication parameters, which are determined by the IoT device from multiple frequency domain indication parameters based on the IoT device's device type and / or maximum transmit power.

23. The method according to any one of claims 14-22, characterized in that, The response to the second message to send a third message includes: If the second message includes the first identifier, during the process of receiving the second message, at least one of the following is obtained: the access timing, transmission power, and transmission frequency used by the IoT device when sending the second message. The device type and / or maximum transmission power of the IoT device are determined based on at least one of the access timing, transmission power, and transmission frequency. The third message is generated based on the device type and / or maximum transmit power of the IoT device; If the second message includes the first identifier and the first information, the third message is generated based on the first information.

24. The method according to claim 23, characterized in that, The third message includes at least one of proximity indication information, frequency domain resource information, and power control information; the proximity indication is used to characterize the communication distance between the IoT device and the access network device.

25. The method according to claim 24, characterized in that, The frequency domain resource information includes any one of frequency range, frequency value, and frequency offset.

26. The method according to claim 124, characterized in that, The power control information also includes any one of the following: power range, power value, and power change.

27. The method according to any one of claims 14-26, characterized in that, Before sending the first message to the IoT device, the method further includes: Send a paging message, the paging message including the identifier of the access network device, the identifier of the access network device being used to trigger the IoT device to determine whether to respond to the first message.

28. An environmental Internet of Things (IoT) system, characterized in that, It includes an IoT device and an access network device, wherein the IoT device performs the communication method according to any one of claims 1-13, and the access network device performs the communication method according to any one of claims 14-27.

29. An Internet of Things (IoT) device, characterized in that, Includes a module for performing the communication method as described in any one of claims 1-13.

30. An access network device, characterized in that, Includes a module for performing the communication method as described in any one of claims 14-27.

31. A computer-readable storage medium, characterized in that, The storage medium stores a computer program or instructions, which, when executed by a communication device, implement the communication method as described in any one of claims 1-13, or the communication method as described in any one of claims 14-27.

32. A computer program product containing instructions, characterized in that, When it is run on a computer, it causes the computer to perform the communication method as described in any one of claims 1-13, or to perform the communication method as described in any one of claims 14-27.

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