A non-orthogonal multiple access hybrid access method

Abstract

The application provides a non-orthogonal multiple access hybrid access method, belonging to the field of communication, and mainly improving utilization of NOMA transmission resources; the application dynamically divides multiple power layers used for NOMA transmission into a licensed power layer set and an unlicensed power layer set by an access node, the licensed power layer is centrally scheduled and allocated to specific terminal nodes for licensed access by the access node, and the unlicensed power layer is open to multiple terminal nodes, allowing them to perform unlicensed access through random competition. Since the method of the application allows dynamic sharing of the same power layer resources, it breaks the strict resource boundary division between licensed access and unlicensed access in the prior art, avoids resource idling or overload caused by dynamic changes in services, and significantly improves the overall utilization of power and spectrum resources.

Description

Technical Field

[0001] This invention belongs to the field of communication technology and mainly relates to a non-orthogonal multiple access hybrid access method. Background Technology

[0002] With the rapid development of mobile internet, the Internet of Things (IoT), machine-to-machine (M2M) communication, and other services, fifth-generation mobile communication systems (5G) and future wireless communication networks need to simultaneously meet diverse Quality of Service (QoS) requirements, such as ultra-high speed, massive connectivity, low latency, and high reliability. Traditional orthogonal multiple access (such as OFDMA) suffers from limited spectrum efficiency due to orthogonal resource allocation, making it difficult to support massive connectivity.

[0003] Non-orthogonal multiple access (NOMA) technology, especially power domain NOMA, significantly improves spectral efficiency and the number of user connections by allowing different user equipment (UEs) to transmit at different power levels on the same time-frequency resource block (RB) and separating the signal at the receiving end through serial interference cancellation (SIC). It is considered one of the key technologies to meet the above requirements.

[0004] In a power-domain NOMA system, both uplink and downlink transmissions are multiplexed by multiple users based on the power domain. The base station (BS) or access point (AP) divides the available power into multiple power layers, and each user is assigned to a specific power layer. To meet the Quality of Service (QoS) requirements of different services, a NOMA system needs to support two access methods simultaneously: Granted Access: Suitable for periodic, high-bandwidth, or quality-of-service (QoS) guaranteed services. Users need to request dedicated power layer resources from the base station.

[0005] Grant-Free Access: Suitable for bursty, small data packet or latency-sensitive services (such as IoT / M2M). Users can send data directly on predefined resources without complex scheduling request processes, thereby reducing signaling overhead and access latency.

[0006] In existing technical solutions, a typical power domain NOMA resource allocation scheme involves dividing the base station (BS) or access point (AP) into multiple power layers and scheduling one terminal device to perform uplink transmission for each power layer. In this scheme, the BS or AP needs to know the uplink demands of the terminal devices in advance, resulting in significant overhead. Furthermore, if a terminal device has some urgent, low-latency services that are not scheduled by the BS or AP, this leads to increased latency and decreased service quality. Existing solutions typically perform a strict, static division of time-frequency resources or power layers between licensed and unlicensed access. However, due to the highly dynamic and bursty nature of user traffic in time and space, this static division leads to low resource utilization: when there are few licensed users, licensed resources are idle; when there are many unlicensed users, insufficient competition for resources intensifies collisions. Summary of the Invention

[0007] In order to overcome the shortcomings of existing technologies and improve resource utilization, this invention provides a non-orthogonal multiple access hybrid access method.

[0008] The technical solution adopted by this invention to solve its technical problem is as follows: A non-orthogonal multiple access hybrid access method is applied on the access side, wherein the access side divides the power layers; the power layers include a licensed power layer set and an unlicensed power layer set, and includes the following steps: Step B1: The access side receives the scheduling request SR sent by the terminal side; Step B2: The access side parses the transmission bandwidth and QoS of the data to be transmitted in the scheduling request SR; the access side determines the access type based on the transmission bandwidth and QoS of the data to be transmitted, and the access type includes authorized access and unauthorized access; Step B3: If the access type is an authorized access service, the access side selects a power layer from the authorized power layer set and generates power layer resource indication information; if the access type is an unauthorized access service, the access side selects a power layer from the unauthorized power layer set and generates power layer resource indication information. The access side issues an uplink grant on the downlink control channel; the uplink grant includes authorized power layer resource indication information; the power layer resource indication information includes one or more power layers; Step B4: The access side receives data on the resources indicated by the power layer resource information; Step B5: The access side parses the received data. If the parsing is successful, an ACK message is sent to the terminal. Step B6: The access side periodically updates the power layer.

[0009] Furthermore, the process of determining the access type is as follows: If the transmission bandwidth of any user's data to be transmitted is greater than the preset bandwidth threshold, the user's access type is authorized access service; if the transmission bandwidth of any user's data to be transmitted is less than or equal to the preset bandwidth threshold, the user's access type is unauthorized access service. If any user's QoS is greater than the preset reliability threshold, the user's access type is authorized access service; if any user's QoS is less than or equal to the preset reliability threshold, the user's access type is unauthorized access service.

[0010] Furthermore, the step of updating the power layer on the access side is as follows: If the proportion of service requests with QoS greater than the preset reliability threshold received by the access side is greater than the preset proportion threshold, then the power layer is reduced from the unlicensed power layer set and the reduced power layer is added to the licensed power layer set. If the collision rate on the unlicensed power layer at the access side is greater than the collision threshold, the random access efficiency will decrease. To reduce the pressure of traffic competition, the power layers will be reduced from the unlicensed power layer set and the reduced power layers will be added to the licensed power layer set. If the number of randomly accessed terminals in the unlicensed power layer continues to decrease within a fixed period on the access side, then the power layer is reduced from the unlicensed power layer set and the reduced power layer is added to the licensed power layer set. If the access side detects that the number of access requests for the unlicensed power layer continues to increase within a fixed period and the collision rate is lower than the collision threshold, then the power layer is reduced from the authorized power layer set and the reduced power layer is added to the unlicensed power layer set. If the access side detects that there is an unused power layer within a fixed period of authorized power layers, the unused power layer will be added to the unlicensed power layer set.

[0011] Furthermore, the power layer resource indication information is generated using a bitmap indication method, a start-end index method, or a list indication method; The process of generating power layer resource indication information using the bitmap indication method is as follows: Set a bitmap of length N, with each bit corresponding to a power layer; where N is the total number of power layers; set the bit corresponding to the allocated power layer to 1, and set the remaining bitmap to 0, and use the bitmap as the power layer resource indication information; for example, bit '1' indicates that the power layer is an unlicensed power layer, and '0' indicates that it is a licensed power layer; The process of generating power layer resource indication information using the start-end index method is as follows: index the power layer number, and the power layer resource indication information is the start index and end index of the allocated power layer; the start-end index method is suitable for scenarios where power layers are allocated continuously; The process of generating power layer resource indication information using the list indication method is as follows: index the number of power layers, and the power layer resource indication information is an index list of the allocated power layers.

[0012] A non-orthogonal multiple access hybrid access method, applied to the terminal side, includes the following steps: Step U1: The terminal sends a scheduling request SR; Step U2: The terminal side parses the power layer resource indication information in the uplink authorization, and the terminal side transmits data in the power layer of the power layer resource indication information; Step U3: The terminal receives the ACK message; if the ACK message is received, the transmission is successful; if the ACK message reception times out, the data is retransmitted.

[0013] The intersection between the authorized power layer set and the unauthorized power layer set is either empty or not empty, meaning that the two sets share some or all of the same power layers, which allows them to overlap, thereby avoiding resource idleness or overload caused by dynamic changes in business.

[0014] The beneficial effects of this invention are as follows: Because the method allows both licensed and unlicensed access to dynamically share the same power layer resources, it breaks the strict resource boundary division between licensed and unlicensed access in existing technologies, avoiding resource idleness or overload caused by dynamic changes in services, thereby significantly improving the overall utilization rate of power and spectrum resources. This invention provides an efficient unlicensed access channel for bursty, small-data-packet services, eliminating the complex scheduling request and authorization signaling interaction process, greatly reducing access latency and signaling overhead, meeting the low-latency, high-volume connection service requirements of 5G and future networks, and reducing access latency and signaling overhead. Base stations or access points can dynamically and flexibly adjust the division of licensed / unlicensed power layers according to real-time network status and service QoS requirements. For high-priority or latency-sensitive services, deterministic guarantees can be provided through licensed scheduling, and priority access opportunities can be obtained in the unlicensed pool through a channel reservation mechanism, enhancing system flexibility and service quality assurance. Attached Figure Description

[0015] Figure 1 This is a flowchart of Embodiment 1 of the present invention; Figure 2 This is a flowchart of Embodiment 2 of the present invention. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] A non-orthogonal multiple access hybrid access method is applied on the access side, wherein the access side divides the power layers; the power layers include a licensed power layer set and an unlicensed power layer set, and includes the following steps: Step B1: The access side receives the scheduling request SR sent by the terminal side; Step B2: The access side parses the transmission bandwidth and QoS of the data to be transmitted in the scheduling request SR; The access side determines the access type based on the transmission bandwidth and QoS of the data to be transmitted. The access types include authorized access and unauthorized access. The process for determining the access type is as follows: If the transmission bandwidth of any user's data to be transmitted is greater than the preset bandwidth threshold, the user's access type is authorized access service; if the transmission bandwidth of any user's data to be transmitted is less than or equal to the preset bandwidth threshold, the user's access type is unauthorized access service. If any user's QoS is greater than the preset reliability threshold, the user's access type is authorized access service; if any user's QoS is less than or equal to the preset reliability threshold, the user's access type is unauthorized access service.

[0018] Step B3: If the access type is an authorized access service, the access side selects a power layer from the authorized power layer set and generates power layer resource indication information; if the access type is an unauthorized access service, the access side selects a power layer from the unauthorized power layer set and generates power layer resource indication information. The access side issues an uplink grant on the downlink control channel; the uplink grant includes authorized power layer resource indication information; the power layer resource indication information includes one or more power layers; Step B4: The access side receives data on the resources indicated by the power layer resource information; Step B5: The access side parses the received data. If the parsing is successful, an ACK message is sent to the terminal. Step B6: The access side periodically updates the power layer; return to step B1; The steps for updating the power layer on the access side are as follows: If the proportion of service requests with QoS greater than the preset reliability threshold received by the access side is greater than the preset proportion threshold, then the power layer is reduced from the unlicensed power layer set and the reduced power layer is added to the licensed power layer set. If the collision rate on the unlicensed power layer at the access side is greater than the collision threshold, the random access efficiency will decrease. To reduce the pressure of traffic competition, the power layers will be reduced from the unlicensed power layer set and the reduced power layers will be added to the licensed power layer set. If the number of randomly accessed terminals in the unlicensed power layer continues to decrease within a fixed period on the access side, then the power layer is reduced from the unlicensed power layer set and the reduced power layer is added to the licensed power layer set. If the access side detects that the number of access requests for the unlicensed power layer continues to increase within a fixed period and the collision rate is lower than the collision threshold, then the power layer is reduced from the authorized power layer set and the reduced power layer is added to the unlicensed power layer set. If the access side detects that there is an unused power layer in the licensed power layer within a fixed period, the unused power layer will be added to the unlicensed power layer set. A non-orthogonal multiple access hybrid access method, applied to the terminal side, includes the following steps: Step U1: The terminal sends a scheduling request SR; Step U2: The terminal side parses the power layer resource indication information in the uplink authorization, and the terminal side transmits data in the power layer of the power layer resource indication information; Step U3: The terminal receives the ACK message; if the ACK message is received, the transmission is successful; if the ACK message reception times out, the data is retransmitted. The power layer resource indication information is generated using bitmap indication method, start-end index method, or list indication method; The process of generating power layer resource indication information using the bitmap indication method is as follows: Set a bitmap of length N, with each bit corresponding to a power layer; where N is the total number of power layers; for example, bit '1' indicates that the power layer is an unlicensed power layer, and '0' indicates that it is a licensed power layer; The process of generating power layer resource indication information using the start-end index method is as follows: index the total number of power layers, and indicate the start and end indexes of the unlicensed power layers; the start-end index method is suitable for scenarios where power layers are allocated continuously; The process of generating power layer resource indication information using the list indication method is as follows: index the total number of power layers and list the indexes of all unlicensed power layers; This invention is applicable to wireless communication systems comprising at least one first access node (such as a base station (BS) or access point (AP)) and multiple first terminal nodes (such as user equipment (UE) or site (STA)). The system employs power domain non-orthogonal multiple access (NOMA) technology, where the first access node and the first terminal nodes transmit uplink data on the same time-frequency resource block through different power layers. The complete communication process is as follows: the first terminal node generates a transmission request and reports service characteristics; the first access node determines the service type and access method accordingly; subsequently, it divides the power layer, allows multiple users to access the uplink and transmit data, and finally, the first access node receives and processes the data. This invention's method is applied to the dynamic allocation of the power layer and the uplink channel access steps after the first access node determines the terminal access method and before data transmission.

[0019] The core idea of ​​this invention is that the first access node dynamically divides the multiple power layers used for NOMA transmission into a "licensed power layer set" and an "unlicensed power layer set." The licensed power layers are centrally scheduled and allocated by the first access node to specific first terminal nodes for licensed access. The unlicensed power layers are open to multiple first terminal nodes, allowing them to access the network unlicensed through random contention. The two sets can share some or all of the same power layers, meaning overlap is allowed.

[0020] Dynamicity refers to the ability of base stations or access points to dynamically and flexibly adjust the division of licensed / unlicensed power layers based on real-time network conditions and service QoS requirements.

[0021] Specifically, the update timing of the power layer partitioning includes, but is not limited to, scenarios such as changes in service load, changes in resource usage, changes in network congestion status, or when a periodic reconfiguration timer is triggered.

[0022] Furthermore, the update action includes: re-dividing the licensed power layer set and the unlicensed power layer set; adjusting the power range corresponding to each power layer; and updating the power layer resource indication information, and broadcasting the new power layer configuration to the terminal through the downlink control channel.

[0023] The criteria for classifying authorized access services include periodic transmission, large bandwidth requirements, and high reliability requirements; for example, when the bandwidth required by the service exceeds a preset bandwidth threshold (e.g., 1 MHz), or the target reliability exceeds a preset reliability threshold (e.g., PER≤10). -5 When this occurs, the service is classified as an authorized access service.

[0024] The criteria for classifying unauthorized access services include bursty transmission, small data packet length, and low access waiting latency. For example, when the service packet length is not greater than a preset packet length threshold (e.g., 200 B-500 B), or the latency requirement is not greater than a preset latency threshold (e.g., 1 ms-5 ms), or the service can tolerate limited collisions, the service is determined to be an unauthorized access service.

[0025] 1. Conditions for adding a power layer to the authorized power layer set; When one of the following conditions occurs, the first access node can allocate more power layers to the licensed power layer set: 1) As the number of requests for critical business or highly reliable services in the system increases, more authorized and controllable resources are needed to ensure service quality. 2) The collision rate on the unlicensed power layer is significantly increased, and the efficiency of random access is reduced. To alleviate the pressure of traffic contention, the proportion of licensed access needs to be increased. 3) When network congestion occurs, it is necessary to centrally allocate uplink resources to enhance network controllability and stability.

[0026] In the above scenario, the first access node will publish new power layer resource indication information through the downlink control channel, adjust some power layers that originally belonged to the unlicensed power layer set to the licensed power layer set, and send out the adjusted bitmap or index information. The terminal side will then adjust its uplink access behavior accordingly.

[0027] 2. Conditions for reducing the number of power layers in the unlicensed power layer set; The first access node may reduce the number of power layers in the unlicensed power layer set when the following conditions occur: 1) If the number of random access terminals on the unlicensed power layer decreases during a certain period, the probability of service conflicts will decrease. At this time, the number of unlicensed power layers can be appropriately reduced to improve resource utilization. 2) Certain power layers need to be used temporarily for scheduling specific authorized services and do not need to be widely exposed; 3) When there is illegal interference or other security risks, reduce the degree of openness and improve control precision.

[0028] At this point, the first access node will reclaim part of the unlicensed power layer as an authorized power layer or temporarily shut it down. New power layer indication information will be sent out in real time, and the terminal will select the access method based on the latest information.

[0029] Example 1: This embodiment describes the authorized transmission scheduling method of the first access node (such as an AP) in an uplink transmission scenario, and instructs the unlicensed power layer to allow terminals to compete for access. The process is as follows: Figure 1 As shown.

[0030] Step 1 (Resource Configuration and Instructions): Step 1.1: The first access node divides all power layers into two sets: the "licensed power layer set" and the "unlicensed power layer set".

[0031] Step 1.2: The first access node sends a first control packet. The first control packet contains power layer resource indication information, which is used to clearly inform all first terminal nodes in the cell of the currently available unlicensed power layer.

[0032] Bitmap indication method: Set up a bitmap with a length of N equal to the total number of power layers. Each bit corresponds to a power layer. For example, bit '1' indicates that the power layer is an unlicensed power layer, and '0' indicates that it is a licensed power layer.

[0033] Start and end index method: indicates the start and end indexes of the unlicensed power layer, which is suitable for scenarios where the power layer is continuously allocated.

[0034] List-based indexing: Directly lists the indices of all unlicensed power tiers; Step 2 (Authorized Transmission Scheduling): The first access node selects one or more power layers from the “authorized power layer set” to schedule uplink data transmission for a specific first terminal node (e.g., UE1).

[0035] Step 3 (Authorized terminal node transmission): The first terminal node (e.g., UE1) scheduled by the first access node transmits uplink data at the scheduled authorized power layer.

[0036] Step 4 (Unauthorized terminals compete for access): After receiving the first control packet sent by the first access node, one or more first terminal nodes (e.g., UE2 and UE3) with unlicensed access requirements parse the power layer resource indication information in the packet to obtain the set of unlicensed power layers currently available for random contention.

[0037] They will select a power layer from the set of unlicensed power layers according to a preset random contention strategy. The random contention strategy includes, but is not limited to: Random selection strategy: Select one layer randomly and uniformly from the available power layers.

[0038] The backoff-based contention strategy: Before transmitting, each terminal node randomly selects a backoff value within a contention window. Uplink data is only transmitted on that power layer when the backoff counter decrements to zero and the selected power layer is not perceived as "occupied" at the current moment (e.g., through power detection or NAV mechanisms).

[0039] Step 5 (Receiving and Processing): The first access node receives data at all power layers (including licensed and unlicensed). For data transmitted using the licensed power layer, the first access node directly performs SIC decoding based on pre-defined scheduling information. For data transmitted using the unlicensed power layer, the first access node performs blind detection.

[0040] Terminal nodes with transmission needs send service requirement report messages to report service characteristics. The service requirement report messages include information such as data size and latency requirements. Subsequently, the first access node receives the service requirement report messages, parses out the data size, latency requirements, and other information, and determines the service type (authorized access service or unauthorized access service) accordingly. Based on the service requirements, it dynamically divides multiple power layers into an "authorized power layer set" and an "unauthorized power layer set". Then, it sends a first control packet, which contains power layer resource indication information to clearly inform all first terminal nodes in the cell of the currently available unauthorized power layers.

[0041] For a first terminal node (such as UE1) with authorized access requirements, the first access node selects one or more power layers from the "authorized power layer set" and sends downlink control information (authorization scheduling) to UE1 to indicate parameters such as the transmission resource blocks and allocated power layers of UE1. After receiving and parsing the downlink control information (authorization scheduling) sent by the base station, UE1 accesses the channel and transmits uplink data according to the specified power and time-frequency resource blocks.

[0042] The first terminal node (such as UE2 or UE3) with unlicensed access requirements receives the first control packet sent by the first access node, parses out the power layer resource indication information in it, selects a power layer access channel from the available unlicensed power layer set according to a preset random contention strategy, and transmits uplink data.

[0043] Example 2: Capacity Negotiation and Parameter Configuration This embodiment describes the capability negotiation and parameter configuration process for the hybrid channel access function between the first terminal node and the first access node. The process can be found in [link to flowchart]. Figure 2 .

[0044] Step 1 (Capability Reporting): During association or reassociation, the first terminal node sends a first management frame to the first access node. This first management frame contains an authorization capability indication field, which indicates whether the terminal node supports the unlicensed access method proposed in this invention (including receiving power layer indication, performing unlicensed random contention, performing channel reservation, etc.).

[0045] Step 2 (Parameter Configuration and Enabling): After receiving the capability report from the first terminal node, the first access node replies with a second management frame. This second management frame contains an authorization configuration information element. This information element contains at least one or more of the following parameters: Function enable indicator: Clearly indicates whether the unauthorized access function is enabled.

[0046] Power layer partitioning update cycle: Indicates the cycle during which the first access node broadcasts power layer resource indication information.

[0047] Unlicensed Power Layer Set: A list of unlicensed power layers used to indicate the initial or default configuration.

[0048] Contention parameters: used to indicate the minimum / maximum contention window, backoff algorithm type, or other contention control parameters during the unlicensed access process.

[0049] Reservation parameters: used to indicate the maximum allowed channel reservation duration or the maximum backoff value.

[0050] Step 3 (Function Activation): After successfully receiving and parsing the second management frame, the first terminal node activates its local hybrid access function based on the authorization configuration information contained therein. Subsequently, in subsequent communications, it will perform authorized or unauthorized data transmission according to the latest power layer resource indication information and contention parameters broadcast by the first access node.

[0051] During association or reassociation, the first terminal node sends a first management frame to the first access node. This first management frame includes an authorization capability indication field, indicating whether the terminal node supports the unlicensed access method proposed in this invention. Upon receiving the first management frame from the first terminal node, the first access node replies with a second management frame. This second management frame includes an authorization configuration information element. If the terminal node does not support the unlicensed access method proposed in this invention, the authorization configuration information element in the second management frame only contains a function enable indication parameter, which is disabled, indicating that the terminal node does not enable the unlicensed access function. If the terminal node supports the unlicensed access method proposed in this invention, the function enable indication parameter in the authorization configuration information element of the second management frame is enabled, indicating that the terminal node enables the unlicensed access function. Furthermore, the authorization configuration information element of the second management frame also configures parameters such as the power layer partitioning update cycle, the unlicensed power layer set, contention parameters, and reservation parameters.

[0052] After successfully receiving and parsing the second management frame, the first terminal node activates its local hybrid access function based on the authorization configuration information contained therein. Subsequently, in subsequent communications, it will perform authorized or unauthorized data transmission according to the latest power layer resource indication information and contention parameters broadcast by the first access node.

Claims

1. A non-orthogonal multiple access hybrid access method applied to an access side, characterized in that, The access side is divided into power layers; the power layers include a set of licensed power layers and a set of unlicensed power layers, including the following steps: Step B1: The access side receives the scheduling request SR sent by the terminal side; Step B2: The access side parses the transmission bandwidth and QoS of the data to be transmitted in the scheduling request SR; The access side determines the access type based on the transmission bandwidth and QoS of the data to be transmitted. The access types include authorized access and unauthorized access. Step B3: If the access type is authorized access service, the access side selects a power layer from the authorized power layer set and generates power layer resource indication information; If the access type is an unauthorized access service, the access side selects a power layer from the unauthorized power layer set and generates power layer resource indication information. The access side issues an uplink grant on the downlink control channel; the uplink grant includes authorized power layer resource indication information; the power layer resource indication information includes one or more power layers; Step B4: The access side receives data on the resources indicated by the power layer resource information; Step B5: The access side parses the received data. If the parsing is successful, an ACK message is sent to the terminal. Step B6: The access side periodically updates the power layer.

2. The non-orthogonal multiple access hybrid access method according to claim 1, characterized in that, The process for determining the access type is as follows: If the transmission bandwidth of any user's data to be transmitted is greater than the preset bandwidth threshold, the user's access type is authorized access service; if the transmission bandwidth of any user's data to be transmitted is less than or equal to the preset bandwidth threshold, the user's access type is unauthorized access service. If any user's QoS is greater than the preset reliability threshold, the user's access type is authorized access service; if any user's QoS is less than or equal to the preset reliability threshold, the user's access type is unauthorized access service.

3. The non-orthogonal multiple access hybrid access method according to claim 1, characterized in that, The steps for updating the power layer on the access side are as follows: If the proportion of service requests with QoS greater than the preset reliability threshold received by the access side is greater than the preset proportion threshold, then the power layer is reduced from the unlicensed power layer set and the reduced power layer is added to the licensed power layer set. If the collision rate on the unlicensed power layer at the access side is greater than the collision threshold, the random access efficiency will decrease. To reduce the pressure of traffic competition, the power layers will be reduced from the unlicensed power layer set and the reduced power layers will be added to the licensed power layer set. If the number of randomly accessed terminals in the unlicensed power layer continues to decrease within a fixed period on the access side, then the power layer is reduced from the unlicensed power layer set and the reduced power layer is added to the licensed power layer set. If the access side detects that the number of access requests for the unlicensed power layer continues to increase within a fixed period and the collision rate is lower than the collision threshold, then the power layer is reduced from the authorized power layer set and the reduced power layer is added to the unlicensed power layer set. If the access side detects that there is an unused power layer within a fixed period of authorized power layers, the unused power layer will be added to the unlicensed power layer set.

4. The non-orthogonal multiple access hybrid access method according to claim 1, characterized in that, The power layer resource indication information is generated using bitmap indication method, start-end index method, or list indication method; The process of generating power layer resource indication information using the bitmap indication method is as follows: set a bitmap of length N, with each bit corresponding to a power layer; where N is the total number of power layers; set the bit corresponding to the allocated power layer to 1, and set the remaining bitmap to 0, and use the bitmap as the power layer resource indication information; The process of generating power layer resource indication information using the start-end index method is as follows: index the power layer number, and the power layer resource indication information is the start index and end index of the allocated power layer; The process of generating power layer resource indication information using the list indication method is as follows: index the number of power layers, and the power layer resource indication information is an index list of the allocated power layers.

5. A non-orthogonal multiple access hybrid access method, applied to the terminal side, characterized in that, Includes the following steps: Step U1: The terminal sends a scheduling request SR; Step U2: The terminal side parses the power layer resource indication information in the uplink authorization, and the terminal side transmits data in the power layer of the power layer resource indication information; Step U3: The terminal receives the ACK message; if the ACK message is received, the transmission is successful; if the ACK message reception times out, the data is retransmitted.

6. A storage medium, characterized in that, It stores a computer program, which, when executed by a processor, implements the steps of the non-orthogonal multiple access hybrid access method according to any one of claims 1-5.

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