CN108811038B - Non-orthogonal multiple access method and equipment for large-scale machine type communication - Google Patents
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Abstract
The embodiment of the invention provides a non-orthogonal multiple access method and equipment for large-scale machine type communication, wherein the method comprises the following steps: sending an uplink data transmission request to a base station to which the mobile terminal belongs, and generating a random number p; if the random number p is judged and obtained to be less than or equal to the control parameter of the extended access class prohibition, uplink transmission is carried out in the current time slot by a non-orthogonal multiple access method; wherein the uplink transmission is transmitted by a non-orthogonal multiple access method. The method provided by the invention divides the cell into L layers in the process of applying the distributed layered NOMA mechanism to uplink scheduling-free transmission, so that the number of competitive devices is reduced to one L of the number before layering.
Description
Technical Field
The embodiment of the invention relates to the field of 5G communication, in particular to a non-orthogonal multiple access method and equipment for large-scale machine type communication.
Background
With brand-new internet of things, market and creative demands of smart cities, smart homes, environment monitoring, industrial monitoring, food traceability and the like, the explosive development period of the global internet of things industry is driven. Meanwhile, the internet of things standardization work which is conducted at home and abroad in a fierce manner also enables the application of the internet of things technology to be more mature and stable. Machine-type communication (MTC) is one of the key technologies for developing the 5G internet of things. Large-scale machine-type communication (mtc) is one of three major 5G application scenarios defined by the International Telecommunications Union (ITU), and such scenarios need to solve the problems of large connection density, low terminal power consumption, deep coverage, and the like. These connection devices have small data volume per transmission, low data rate requirements, and insensitivity to latency, but have high requirements for power consumption, coverage capability, and support for large-scale synchronous communications. The existing cellular network uplink access is designed by adapting human voice communication and the like according to the characteristics of long connection time, large data volume of single connection, non-burst and the like. In the prior art, when an mtc large-scale low power consumption access is faced, the following problems exist, because there are many supported communication types, the resource capacity for the mtc is extremely limited, and the requirements of large-scale equipment burst and synchronous access cannot be met, and secondly, the uplink access technology of the conventional cellular network consistently inherits orthogonal access (OMA) and scheduling-based access, and when an mtc service facing a small burst packet, the problems of insufficient connection resources, huge scheduling signaling overhead, and the like often exist.
Disclosure of Invention
The embodiment of the invention provides a non-orthogonal multiple access method and equipment for large-scale machine type communication, which are used for solving the problems that in the prior art, when mMTC is accessed in a large-scale and low-power mode, the resource capacity for mMTC is extremely limited, the requirements of large-scale equipment on burst and synchronous access cannot be met, when mMTC services with burst small packets are faced, insufficient connection resources often exist, the occupied ratio of scheduling signaling is large, and the like.
The embodiment of the invention provides a non-orthogonal multiple access method for large-scale machine type communication, which comprises the following steps:
s1, sending an uplink data transmission request to the affiliated base station and generating a random number p;
s2, if judging and knowing that the random number p is less than or equal to the control parameter of the extended access class prohibition, carrying out uplink transmission in the current time slot by a non-orthogonal multiple access method;
wherein, the step S2 further includes:
and calculating the transmitting power, and selecting the sub-channel corresponding to the transmitting power for uplink transmission.
Wherein the step of calculating the transmission power specifically comprises:
obtaining a position layer according to the number of distributed layers and the distance between the position layer and the base station, and calculating and obtaining the transmitting power of the current time slot by utilizing a minimum transmitting power principle according to the preset receiving power and the channel gain of the base station;
the number of the distributed layering layers is obtained by sending a parameter request instruction to the base station or by receiving periodic broadcast of the base station.
Wherein, the step S2 further includes: and if the random number p is judged and known to be larger than the extended access class forbidden control parameter, waiting for the next time slot to carry out uplink transmission.
The embodiment of the invention provides a non-orthogonal multiple access method for large-scale machine type communication, which comprises the following steps: and calculating and obtaining the number of distributed layers and the extended access class forbidden control parameters of the base station according to the coverage radius of the base station, the number of target MTCDs and the MTCD average maximum transmitting power constraint, and sending the number of distributed layers and the extended access class forbidden control parameters of the base station to the target MTCDs, so that the target MTCDs can obtain the position layers of the target MTCDs according to the number of the layers and the distance from the target MTCDs to the base station.
Wherein the method further comprises:
receiving a parameter request instruction of the target MTCD and sending the number of distributed layers and the extended access class forbidden control parameters of the base station to the target MTCD;
or, adding the number of layers of the distributed layering and the extended access class barring control parameter into a broadcast signaling, and periodically broadcasting and sending the number of layers of the distributed layering and the extended access class barring control parameter to a target MTCD.
An embodiment of the present invention further provides a non-orthogonal multiple access device for large-scale machine type communication, including:
at least one processor; and at least one memory coupled to the processor, wherein: the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform operations comprising: sending an uplink data transmission request to a base station to which the mobile terminal belongs, and generating a random number p; and if the random number p is judged to be less than or equal to the control prohibition parameter of the extended access class, performing uplink transmission in the current time slot by a non-orthogonal multiple access method.
An embodiment of the present invention further provides a base station, including:
at least one processor; and at least one memory coupled to the processor, wherein: the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform operations comprising: and calculating and obtaining the number of distributed layers and the extended access class forbidden control parameters of the base station according to the coverage radius of the base station, the number of target MTCDs and the MTCD average maximum transmitting power constraint, and sending the number of distributed layers and the extended access class forbidden control parameters of the base station to the target MTCDs, so that the target MTCDs can obtain the position layers of the target MTCDs according to the number of the layers and the distance from the target MTCDs to the base station.
The non-orthogonal multiple access method and the device for large-scale machine type communication provided by the embodiment of the invention have the advantages that a distributed layered NOMA mechanism is applied to an uplink scheduling-free transmission process, a cell is divided into L layers, all channel resources can be used by each layer of device at the same time, but the number of competing devices is reduced to one L before layering, and based on the scheduling-free random access technology of the distributed layered NOMA, the distributed layered NOMA is used for providing multiple access resources, the scheduling-free transmission is used for avoiding a four-step handshake process of a random access process adopted by cellular networks such as LTE and the like, and the purposes of improving the success probability of random access and reducing the signaling overhead are achieved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a flowchart of a non-orthogonal multiple access method for massive machine type communication according to an embodiment of the present invention;
fig. 2 is a block diagram of a non-orthogonal multiple access apparatus for massive machine type communication according to another embodiment of the present invention;
fig. 3 is a schematic physical structure diagram of a non-orthogonal multiple access device for massive machine-type communication according to yet another embodiment of the present invention;
fig. 4 is a schematic physical structure diagram of a base station according to still another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a non-orthogonal multiple access method for massive machine-type communication according to an embodiment of the present invention, where the method includes:
s1, sending an uplink data transmission request to the affiliated base station and generating a random number p;
s2, if judging that the random number p is less than or equal to the control parameter of the extended access class forbidding, carrying out uplink transmission in the current time slot by a non-orthogonal multiple access method;
wherein the access class barring control parameter is calculated by the base station according to a base station coverage radius, a target MTCD number and a target MTCD average maximum transmit power constraint.
Specifically, when a target MTCD (mtc device) with an uplink transmission requirement is active to perform data transmission, a number p between 0 and 1 is randomly generated in the device, it is determined according to the generated random number p that the transmission is performed in the current timeslot or the transmission is performed in the next timeslot, and when the generated random number is less than or equal to EAB (Extended Access Class Barring) control parameter pEABAnd performing uplink transmission in the current time slot by a non-orthogonal multiple access method.
The access type prohibition control parameters are generated by a system base station end according to information such as the number of historical time slot users and the like, the value is greater than 0 and less than or equal to 1, the value is generated by an optimized system access capacity algorithm, the users with access type prohibition control parameter proportion can participate in competitive transmission in the users with uplink data transmission requirements in the current time slot, and the time slots of other users are silent. The access class prohibition control parameter can effectively control the number of users actually initiating uplink data transmission behavior in the current time slot so as to reduce the probability of contention conflict.
In uplink transmission, transmission is performed by using a Non-Orthogonal Multiple Access method, and specifically, a Non-scheduling random Access technology based on a distributed hierarchical NOMA (Non-Orthogonal Multiple Access), and signals of a plurality of devices can use resources with the same frequency simultaneously in a Non-Orthogonal manner through a power domain NOMA.
The receiving end utilizes a multi-device receiving technology, typically a SIC receiver, which demodulates the signals of each device one by one according to a certain sequence. After the signal of each device is demodulated, its signal is reconstructed and subtracted from the received signal without interfering with other devices. This successively demodulates the signals of all devices. Thus, by exploiting the power domain, the communication resources of the device are multiplied. In order to realize the SIC, the received power of the devices using the same frequency resource to the receiving end is required to have a certain power difference successively.
Therefore, first, the received power level and the corresponding received power are preset, for example, there are L received powers in the range of one base station, and the received powers are respectively v from large to small1＞v2＞...＞vLIf the signal-to-noise ratio of the receiving end is required to be at least gamma, and the decoding sequence of the receiving end is from large to small according to the receiving power, the sum of the co-frequency interference and the noise of the L signals is respectively as follows:
and through vl＝Γ(Vl+1), can give vl＝Γ(Γ+1)L-l. Thus, the receiving power level with the minimum receiving power difference is obtained, and the increase of the L value is facilitated.
Considering that the farther from the base station in the practical application scenario, the greater the signal fading due to large-scale fading. In order to reduce the transmission power of the uplink communication of the device, the whole cell is divided into L circular areas, called L layers, according to the distance from the base station. In view of the uniform distribution of the equipment, the basis for dividing the layers is to divide equally according to area, namely:
according to the distance from near to far, the preset arrival power of each layer of equipment is v1,v2,...,vL. The intended arrival power of devices of the same layer is the same. By reducing the expected value of the arrival power of the device far from the base station, the transmission power of the device in the whole system can be reduced.
By the method, a distributed hierarchical NOMA mechanism is applied to an uplink scheduling-free transmission process, a cell is divided into L layers, all channel resources can be used by each layer of equipment at the same time, but the number of competitive equipment is reduced to one L of the number of the equipment before layering, and based on the scheduling-free random access technology of the distributed hierarchical NOMA, multiplied access resources are provided by the distributed hierarchical NOMA, and a four-step handshake process of a random access process adopted by cellular networks such as LTE and the like is eliminated by the scheduling-free transmission, so that the purposes of improving the success probability of random access and reducing the signaling overhead are achieved.
On the basis of the above embodiment, the step S2 is further followed by: the step S2 further includes: and calculating the transmitting power, and selecting the sub-channel corresponding to the transmitting power for uplink transmission.
The step of calculating the transmission power specifically includes:
obtaining a position layer according to the number of distributed layers and the distance between the position layer and the base station, and calculating and obtaining the transmitting power of the current time slot by utilizing a minimum transmitting power principle according to the preset receiving power and the channel gain of the base station;
the number of the distributed layering layers is obtained by sending a parameter request instruction to the base station or by receiving periodic broadcast of the base station.
Wherein the step of calculating the MTCD transmit power specifically comprises: and obtaining a position layer of the MTCD according to the number L of the distributed layers and the distance between the MTCD and the base station, and calculating and obtaining the transmitting power of the MTCD in the current time slot by utilizing a minimum transmitting power principle according to preset receiving power and channel gain of the base station.
Specifically, assume that the radius of a certain cell is D, and a single macro base station is located at the center of the cell. Frequency spectrum bandwidth B of total uplink resource of systemTThe smallest uplink transmission resource unit is a subchannel with a bandwidth of B, and thus the subchannels have a common bandwidth
Sub-channel resources. The base station has wide coverage range and large MTCD base number, and is independently and uniformly distributed in each area of a cell.
When the target MTCD selects the time slot for uplink transmission, the distance d from the base station is mainly determined according to the positionkThrough dkThe target MTCD can obtain the position layer l of the base station, and the preset target receiving power is vlSince each MTCD knows its own channel state information, and the information gain g of the sub-channel in which it is locatedi,kCalculating the transmission power of the time slot according to the principle of minimizing the transmission power as follows:
in the formula, PkTransmit power, v, for a target MTCDlIs a preset target received power at location level l. When the corresponding transmitting power is calculated, the target MTCD sends uplink data to the base station through the power, and when the base station receives the uplink data and judges that the data transmitted this time is correct, an ACK signal is fed back to the target MTCD.
By the method, the expected arrival power of the user far away from the base station is reduced, so that the transmission power of the user in the whole system can be reduced.
On the basis of the above embodiment, the step S2 further includes: and if the random number p is judged and known to be larger than the extended access class forbidden control parameter, waiting for the next time slot to carry out uplink transmission.
Specifically, the random number generated in the judgment is larger than the extended access class forbidden control parameter pEABAnd if so, the target MTCD does not perform uplink transmission in the current time slot by the non-orthogonal multiple access method, and waits for the next time slot to perform the uplink transmission step.
On the basis of the above embodiment, the method further includes:
and calculating and obtaining the number of distributed layers and the extended access class prohibition control parameter of the base station according to the coverage radius of the base station, the number of target MTCDs and the target MTCD average maximum transmission power constraint, and sending the number of distributed layers and the extended access class prohibition control parameter of the base station to the target MTCDs, so that the target MTCDs obtain the position layers where the target MTCDs are located according to the number of layered layers and the distance from the base station.
Specifically, a base station at the center of a circular cell periodically predicts and updates the target MTCD number of its service area, denoted as Q. According to the known conditions of base station coverage radius, number of active users, user average maximum transmitting power constraint and the like, the base station executes system Access throughput maximization operation to obtain the next time slot optimization parameters, wherein the obtained optimization parameters comprise 2 parameters, one parameter is distributed layered NOMA layer number L, and the other parameter is EAB (Extended Access Class Barring) control parameter pEABThe access type prohibition control parameters are generated by a system base station end according to the information such as the number of historical time slot users and the like, the value is greater than 0 and less than or equal to 1, the value is generated by an optimized system access capacity algorithm, the users with access type prohibition control parameter proportion can participate in competitive transmission in the users with uplink data transmission requirements in the current time slot, and the time slots of other users are silent. The access class prohibition control parameter can effectively control the number of users actually initiating uplink data transmission behavior in the current time slot so as to reduce the probability of contention conflict. After obtaining the number L and p of the distributed layered NOMA layersEABAfter the two parameters, the base station adds the two parameters into the broadcast signaling in a broadcast mode, and periodically broadcasts all the MTCDs in the coverage area.
In addition, the step of sending the number of distributed tiers of the base station and the extended access class barring control parameter to the target MTCD may be receiving a parameter request instruction of the target MTCD and sending the number of distributed tiers of the base station and the extended access class barring control parameter to the target MTCD.
In another embodiment of the present invention, referring to fig. 2, fig. 2 is a block diagram of a non-orthogonal multiple access apparatus for massive machine type communication according to another embodiment of the present invention, where the apparatus according to the embodiment of the present invention includes: a random number generation module 21 and an access module 22.
Wherein, the random number generation module 21 is configured to send an uplink data transmission request to a base station to which the random number generation module belongs, generate a random number p,
the access module 22 is configured to perform uplink transmission in the current time slot by a non-orthogonal multiple access method if it is determined that the random number p is less than or equal to the extended access class barring control parameter
Specifically, when there is an active MTCD required for uplink transmission to perform data transmission, a number p between 0 and 1 is randomly generated in the device, it is determined according to the generated random number p that the transmission is performed in the current timeslot or the transmission is performed in the next timeslot, and when the generated random number is less than or equal to an EAB (Extended Access Class Barring) control parameter pEABAnd performing uplink transmission in the current time slot by a non-orthogonal multiple access method.
In uplink transmission, transmission is performed by using a Non-Orthogonal Multiple Access method, and specifically, a Non-scheduling random Access technology based on a distributed hierarchical NOMA (Non-Orthogonal Multiple Access), and signals of a plurality of devices can use resources with the same frequency simultaneously in a Non-Orthogonal manner through a power domain NOMA.
Therefore, first, the received power level and the corresponding received power are preset, for example, there are L received powers in the range of one base station, and the received powers are respectively v from large to small1＞v2＞...＞vLIf the signal-to-noise ratio of the receiving end is required to be at least gamma, and the decoding sequence of the receiving end is from large to small according to the receiving power, the sum of the co-frequency interference and the noise of the L signals is respectively as follows:
and through vl＝Γ(Vl+1), can give vl＝Γ(Γ+1)L-l. Thus, the receiving power level with the minimum receiving power difference is obtained, and the increase of the L value is facilitated.
Considering that the farther from the base station in the practical application scenario, the greater the signal fading due to large-scale fading. In order to reduce the transmission power of the uplink communication of the device, the whole cell is divided into L circular areas, called L layers, according to the distance from the base station. In view of the uniform distribution of the equipment, the basis for dividing the layers is to divide equally according to area, namely:
according to the distance from near to far, the preset arrival power of each layer of equipment is v1,v2,...,vL. The intended arrival power of devices of the same layer is the same. By reducing the expected value of the arrival power of the device far from the base station, the transmission power of the device in the whole system can be reduced.
By the device, a distributed layered NOMA mechanism is applied to an uplink scheduling-free transmission process, a cell is divided into L layers, each layer of device can use all channel resources simultaneously, but the number of competing devices is reduced to one L of the number of devices before layering, and based on the scheduling-free random access technology of the distributed layered NOMA, the distributed layered NOMA is used for providing multiple access resources, and the scheduling-free transmission is used for avoiding four-step handshaking processes of random access processes adopted by cellular networks such as LTE and the like, so that the purposes of improving the success probability of random access and reducing signaling overhead are achieved.
On the basis of the above embodiment, the apparatus further includes:
and the power calculation module is used for calculating the transmitting power and selecting the sub-channel corresponding to the transmitting power for uplink transmission.
Specifically, assume that the radius of a certain cell is D, and a single macro base station is located at the center of the cell. Frequency spectrum bandwidth B of total uplink resource of systemTThe smallest uplink transmission resource unit is a subchannel with a bandwidth of B, and thus the subchannels have a common bandwidth
Sub-channel resources. The base station has wide coverage range and large MTCD base number, and is independently and uniformly distributed in each area of a cell.
When the target MTCD selects the time slot for uplink transmission, the distance d from the base station is mainly determined according to the positionkThrough dkThe target MTCD can obtain the position layer l of the base station, and the preset target receiving power is vlSince each MTCD knows its own channel state information, and the information gain g of the sub-channel in which it is locatedi,kCalculating the transmission power of the time slot according to the principle of minimizing the transmission power as follows:
in the formula, PkTransmit power, v, for a target MTCDlIs a preset target received power at location level l. When the corresponding transmitting power is calculated, the target MTCD sends uplink data to the base station through the power, and when the base station receives the uplink data and judges that the data transmitted this time is correct, an ACK signal is fed back to the target MTCD.
By the device, the expected arrival power of the user far away from the base station is reduced, so that the transmission power of the user in the whole system can be reduced.
In still another embodiment of the present invention, there is provided a base station including:
and the parameter generation module is used for calculating and obtaining the number L of distributed layered layers and the extended access class forbidden control parameters of the base station according to the coverage radius of the base station, the target MTCD number and the MTCD average maximum transmitting power constraint.
And the broadcasting module is used for adding the distributed layered layer number L and the extended access class prohibition control parameters into a broadcasting signaling, and carrying out periodic broadcasting to send the distributed layered layer number L and the extended access class prohibition control parameters to the target MTCD.
Specifically, a base station at the center of a circular cell periodically predicts and updates the target MTCD number of its service area, denoted as Q. According to the known conditions of base station coverage radius, number of active users, user average maximum transmitting power constraint and the like, the base station executes system access throughput maximization operation to obtain the next time slot optimization parameters, wherein the obtained optimization parameters comprise 2 parameters, one parameter is distributedThe number of NOMA layers is L, and the other is EAB (Extended Access Class Barring) control parameter pEABAfter obtaining the number L and p of the distributed layered NOMA layersEABAfter the two parameters, the base station adds the two parameters into the broadcast signaling in a broadcast mode, and periodically broadcasts all the MTCDs in the coverage area.
Fig. 3 illustrates a physical structure diagram of a non-orthogonal multiple access device for large-scale machine type communication, and as shown in fig. 3, the server may include: a processor (processor)310, a communication Interface (communication Interface)320, a memory (memory)330 and a bus 340, wherein the processor 310, the communication Interface 320 and the memory 330 complete communication with each other through the bus 340. The communication interface 340 may be used for information transmission between the server and the smart tv. The processor 310 may call logic instructions in the memory 330 to perform the following method: sending an uplink data transmission request to a base station to which the mobile terminal belongs, and generating a random number p; and if the random number p is judged to be less than or equal to the control prohibition parameter of the extended access class, performing uplink transmission in the current time slot by a non-orthogonal multiple access method.
Fig. 4 illustrates a physical structure diagram of a base station, and the server may include: a processor (processor)410, a communication Interface 420, a memory (memory)430 and a bus 440, wherein the processor 410, the communication Interface 420 and the memory 430 are communicated with each other via the bus 440. The communication interface 440 may be used for information transmission between the server and the smart tv. The processor 410 may call logic instructions in the memory 430 to perform the following method: and calculating and obtaining the number of distributed layers and the extended access class prohibition control parameter of the base station according to the coverage radius of the base station, the number of target MTCDs and the MTCD average maximum transmission power constraint, so that the target MTCD obtains the position layer of the target MTCD according to the number of the layers and the distance from the base station, and sends the number of the distributed layers and the extended access class prohibition control parameter of the base station to the target MTCD.
In addition, the logic instructions in the memories 330 and 430 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The apparatus of the embodiment of the present invention may be configured to implement the technical solution of the embodiment of the non-orthogonal multiple access method for large-scale machine type communication provided in the foregoing embodiment, and the implementation principle and the technical effect are similar, which are not described herein again.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A non-orthogonal multiple access method for large scale machine type communication, comprising:
step S1, the communication equipment sends the uplink data transmission request to the affiliated base station and generates the random number p;
step S2, if the communication device judges that the random number p is less than or equal to the control parameter of the extended access class forbidding, the communication device carries out uplink transmission in the current time slot by a non-orthogonal multiple access method;
the access class prohibition control parameters are obtained by the base station through calculation according to the base station coverage radius, the MTCD (Massive machine-Type Communication Device) number and the MTCD average maximum transmitting power constraint;
and the base station effectively predicts the access requirement of the users in the current time slot according to the historical number of the users in the time slot, and then determines the target MTCD number according to the access requirement of the users in the current time slot.
2. The method according to claim 1, wherein the step S2 further comprises:
and calculating the transmitting power, and selecting the sub-channel corresponding to the transmitting power for uplink transmission.
3. The method according to claim 2, wherein the step of calculating the transmit power comprises:
the communication equipment obtains the position layer according to the number of distributed layered layers and the distance between the communication equipment and the base station, and calculates and obtains the transmitting power of the current time slot by utilizing a minimum transmitting power principle according to the preset receiving power and the channel gain of the base station;
the number of the distributed layering layers is obtained by sending a parameter request instruction to the base station or by receiving periodic broadcast of the base station.
4. The method according to claim 1, wherein the step S2 further comprises: and if the communication equipment judges that the random number p is larger than the extended access class forbidden control parameter, waiting for the next time slot to carry out uplink transmission.
5. A non-orthogonal multiple access method for large scale machine type communication, comprising:
a base station end calculates and obtains the number of distributed layered layers and the extended access class forbidden control parameters of the base station according to the base station coverage radius, the number of target MTCDs and the target MTCD average maximum transmitting power constraint, and sends the number of distributed layered layers and the extended access class forbidden control parameters of the base station to the target MTCDs, so that the target MTCDs can obtain the position layers of the target MTCDs according to the number of layered layers and the distance from the base station;
and the base station terminal effectively predicts the access requirement of the users in the current time slot according to the historical number of the users in the time slot, and then determines the number of the target MTCDs according to the access requirement of the users in the current time slot.
6. The method of claim 5, further comprising:
a base station end receives a parameter request instruction of the target MTCD and sends the number of distributed hierarchical layers and the extended access class forbidden control parameters of the base station to the target MTCD;
or, adding the number of layers of the distributed layering and the extended access class barring control parameter into a broadcast signaling, and periodically broadcasting and sending the number of layers of the distributed layering and the extended access class barring control parameter to a target MTCD.
7. A non-orthogonal multiple access device for large scale machine type communication, comprising:
at least one processor;
and at least one memory coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 1 to 4.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
9. A base station, comprising:
at least one processor;
and at least one memory coupled to the processor, wherein:
the memory stores program instructions executable by the processor, the processor invoking the program instructions to perform the method of any of claims 5 to 6.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 5 to 6.
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