CN108777857B - Access control method and system under coexistence scene of URLLC and mMTC - Google Patents

Access control method and system under coexistence scene of URLLC and mMTC Download PDF

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CN108777857B
CN108777857B CN201810864883.9A CN201810864883A CN108777857B CN 108777857 B CN108777857 B CN 108777857B CN 201810864883 A CN201810864883 A CN 201810864883A CN 108777857 B CN108777857 B CN 108777857B
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CN108777857A (en
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侯延昭
张泽宇
王强
陶小峰
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Beijing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
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    • H—ELECTRICITY
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    • H04W—WIRELESS COMMUNICATION NETWORKS
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    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
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Abstract

The embodiment of the invention provides an access control method and system under a URLLC and mMTC coexistence scene, wherein the method comprises the following steps: and for each subcarrier on the bandwidth of the Internet of things system, simultaneously accessing a plurality of URLLC devices and a plurality of mMTC devices according to a preset power distribution algorithm based on an uplink non-orthogonal multiple access (NOMA) mechanism. According to the access control method under the coexistence scene of URLLC and mMTC, the NOMA technology is used, and the multiple URLLC devices and the multiple mMTC devices share the same subcarrier according to the preset power distribution rule, so that the Internet of things system can support higher connection density, and the spectrum efficiency is improved.

Description

Access control method and system under coexistence scene of URLLC and mMTC
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to an access control method and system under the coexistence scene of URLLC and mMTC.
Background
Machine communication (MTC) is an important component of the internet of things (IoT), enabling communication from MTC devices to a central MTC server or group of MTC servers. The MTC device (MTCD) has an extremely wide application prospect, such as a wireless detection sensing device, a wireless control system of factory equipment and an intelligent transportation system. The International Telecommunications Union (ITU) has divided MTC into two categories: large-scale mtc (mtc) and ultra-reliable and low-latency communication (URLLC). Where mtc devices have a high connection density, a large number of low-cost and low-power MTCD devices, such as wireless sensor systems, may coexist in each cell. These devices transmit small packets with low latency requirements in an order of less than or equal to a few seconds. mtc devices need to communicate with high energy efficiency, and have low requirements for time delay and the like. Whereas URLLC requires reliable data transfer, a strict latency constraint of 10 milliseconds or less because it is used for mission critical applications such as medical internet of things systems and traffic system internet of things systems.
In NB-IoT, Frequency Division Multiple Access (FDMA) using Orthogonal Multiple Access (OMA) scheme can be divided into 48 or 12 subcarriers when the system bandwidth is accessed on one Physical Resource Block (PRB), i.e., a narrow bandwidth of 180 kHz. In the case of 48 subcarriers, each MTCD may be allocated a single subcarrier. In the case of 12 subcarriers, each MTCD may be allocated a single subcarrier or 3, 6, 12 consecutive subcarriers. With OFDMA, only one MTCD device per subcarrier is allowed to use, so it may not cope well with scenarios where a larger number of MTCD devices request linking in an LTE-a Pro network. When the number of devices is large, many devices cannot upload data to the base station in time due to no sub-carriers being allocated, which is extremely detrimental to the user experience, especially for devices with high rate and delay requirements, such as URLLC.
Therefore, there is a need for an access control method in a coexistence scenario of URLLC and mtc to solve the above problems.
Disclosure of Invention
In order to solve the above problem, embodiments of the present invention provide a method for configuring an uplink scheduling request and a terminal device, which overcome the above problem or at least partially solve the above problem.
In a first aspect, an embodiment of the present invention provides an access control method in a coexistence scenario of URLLC and mtc, including:
and for each subcarrier on the bandwidth of the Internet of things system, simultaneously accessing a plurality of URLLC devices and a plurality of mMTC devices according to a preset power distribution algorithm based on an uplink non-orthogonal multiple access (NOMA) mechanism.
In a second aspect, an embodiment of the present invention further provides an access control system in a coexistence scenario of URLLC and mtc, including:
and the access control module is used for simultaneously accessing a plurality of URLLC devices and a plurality of mMTC devices according to a preset power allocation algorithm on the basis of an uplink non-orthogonal multiple access (NOMA) mechanism for each subcarrier on the bandwidth of the Internet of things system.
A third aspect of the present invention provides an access control device in a coexistence scenario of URLLC and mtc, including:
a processor, a memory, a communication interface, and a bus; the processor, the memory and the communication interface complete mutual communication through the bus; the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the access control method in the coexistence scenario of URLLC and mtc.
A fourth aspect of the present invention provides a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the above method.
According to the access control method under the coexistence scene of URLLC and mMTC, the NOMA technology is used, and the multiple URLLC devices and the multiple mMTC devices share the same subcarrier according to the preset power distribution rule, so that the Internet of things system can support higher connection density, and the spectrum efficiency is improved.
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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 schematic flowchart of an access control method in a coexistence scenario of URLLC and mtc according to an embodiment of the present invention;
fig. 2 is a structural diagram of an access control system in a coexistence scenario of URLLC and mtc according to an embodiment of the present invention;
fig. 3 is a block diagram of an access control device in a coexistence scenario of URLLC and mtc according to an 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 described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, 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.
Currently, narrowband internet of things NB-IoT can achieve energy efficient communication within the bandwidth range of low cost MTC devices (MTCD) with a narrow bandwidth of 180kHz, but cannot provide connectivity for a large number of MTCD, including URLLC devices with high QOS requirements and MTC devices with low QOS requirements.
In order to solve the problem that a user cannot access or has a long waiting time when the number of users in a narrowband internet of things is large, fig. 1 is a schematic flow chart of an access control method in a coexistence scenario of URLLC and mtc according to an embodiment of the present invention, and as shown in fig. 1, the method includes:
110. and for each subcarrier on the bandwidth of the Internet of things system, simultaneously accessing a plurality of URLLC devices and a plurality of mMTC devices according to a preset power distribution algorithm based on an uplink non-orthogonal multiple access (NOMA) mechanism.
In step 110, it can be understood that the NOMA mechanism, i.e., NOMA technique, described in the embodiment of the present invention can implement sharing of multiple MTCD devices per subcarrier in each timeslot by using the NOMA technique in an NB-IoT system, which is very helpful for scenarios in which the number of devices in the IoT is large.
Further, if only a single URLLC device and at most one mtc device share a subcarrier, the utilization of frequency band resources is extremely wasteful, and for this problem, the embodiment of the present invention can allow multiple mtc devices and multiple URLLC devices to share the same subcarrier in an NB-IoT system according to a preset power allocation algorithm, thereby supporting higher connection density and improving spectrum efficiency.
The preset power allocation algorithm is determined in real time according to the information of the URLLC devices to be accessed and the information of the mtc devices to be accessed in the embodiment of the present invention.
For convenience of description, the embodiments of the present invention are described in the following scenarios as examples.
The embodiment of the invention assumes that an NB-IoT system comprises n subcarriers, wherein the subcarrier set is C, and U is { U ═ U }1,u2,u3,…uUDenotes the URLLC equipment set requesting upload information under the current base station, M ═ M1,m2,m3,…mMAnd represents the mMTC equipment set requesting for uploading information under the current base station. Further, it is assumed that the access priority of each URLLC device is the same, and the access priority of each mtc device is the same, and the priority of the URLLC device is higher than that of the mtc device. Meanwhile, assuming that the QOS requirements of the URLLC devices are the same, the QOS requirements of the mtc devices are also the same, and the channel state information CSI of the devices is known, a scenario where the URLLC devices and mtc devices upload information access together on the kth subcarrier can be represented as:
Figure BDA0001750667240000051
wherein s isu,kAndsm,krespectively represent a set of URLLC devices and a set of mMTC devices which use the kth subcarrier to send information, and the number of the URLLC devices and the number of the mMTC devices on the kth subcarrier are respectivelyNu,kAndNm,k。Xuand XmSent on behalf of URLLC device and mMTC device respectivelyMessage, hu,kAnd hm,kRespectively representing channel gains caused by fading and loss in the process of transmitting signals to a base station by the URLLC device and the mtc device, where σ is gaussian white noise, and each device can only use one subcarrier at this time, so that:
Figure BDA0001750667240000052
then for uplink NOMA the SIC receiver needs different arrival powers to distinguish the multiplexed UEs. In an ideal situation, the base station may distinguish the devices according to the magnitude of the arrival power of the information sent by each device, and since the URLLC has a high requirement on SINR rate and the like, it is assumed that the arrival power of the information sent by the URLLC device is greater than that of the mtc device, that is, | hu,k|2pu,k＞|hm,k|2pm,k. In the case of two URLLC devices, the arrival power of the signals transmitted by the URLLC devices differs, assuming that the signal strength of URLLC device 1 is greater than the signal strength of URLLC device 2, i.e. | hu1,k|2pu1,k＞|hu2,k|2pu2,kSince the interference that device 1 tolerates is the largest, device 1 is allowed to transmit at maximum power to guarantee its SINR requirements. The SINR of the signals received by the base station from URLLC device 1 and device 2 are respectively:
Figure BDA0001750667240000053
wherein N is0In order to be able to measure the noise power spectral density,
Figure BDA0001750667240000054
indicating interference to the URLLC device by the subsequently demodulated mtc device and the subsequently demodulated URLLC device. SINR of mtc device signals is:
Figure BDA0001750667240000061
wherein,
Figure BDA0001750667240000062
representing the interference caused by the next demodulated mtc device to the previous mth device.
The rate required by the URLLC equipment and the mMTC equipment under the condition of satisfying QOS is respectively RUAnd RmThat is, the SINR requirements of the base station receiving the signals of the devices are respectively:
Figure BDA0001750667240000063
and, each device also has a constraint limit on the maximum transmit power, i.e.
Figure BDA0001750667240000064
In summary, the embodiments of the present invention can substantially access MTCD devices as many as possible while satisfying respective QOS requirements, and can be expressed as:
Figure BDA0001750667240000065
wherein, WuAnd WmIs a weighting factor set according to the access priority, and W is the highest access priority of the URLLC equipmentu＝Wm+1。
According to the access control method under the coexistence scene of URLLC and mMTC, the NOMA technology is used, and the multiple URLLC devices and the multiple mMTC devices share the same subcarrier according to the preset power distribution rule, so that the Internet of things system can support higher connection density, and the spectrum efficiency is improved.
On the basis of the above embodiment, before simultaneously accessing a plurality of URLLC devices and a plurality of mtc devices according to a preset power allocation algorithm based on an uplink non-orthogonal multiple access (NOMA) mechanism for each subcarrier on the bandwidth of the internet of things system, the method further includes:
and determining the maximum number of URLLC devices which can be accessed by each subcarrier on the bandwidth of the Internet of things.
As can be seen from the foregoing description of the embodiments, the embodiments of the present invention need to access MTCD devices as many as possible while satisfying respective QOS requirements, and the priority of URLLC devices is higher than that of mtc devices, so the embodiments of the present invention need to preferentially satisfy the maximum number of URLLC devices that can be accessed on a subcarrier.
It can be understood that the larger the interference level that the URLLC device can tolerate, the more opportunities for mtc devices to access. Then the embodiment of the present invention essentially selects a device pair from the URLLC device set to maximize I at each subcarrier, which can be represented by the following equation:
Figure BDA0001750667240000071
the above formula takes as an example whether one subcarrier can access two URLLC devices, assuming that the channel gains of device a and device b satisfy Ga > Gb, and the NOMA receiver can accept the information of both devices simultaneously. When the signal strengths of the two devices are different, the demodulation order of the receiver is also different, and the maximum tolerable interference value is also different, which can be expressed as the following sub-formula:
Figure BDA0001750667240000072
then by solving the above equation can be calculated
Figure BDA0001750667240000081
If yes, I in the above formula has a solution, and then the device a and the device b may share the same subcarrier. On the contrary, if
Figure BDA0001750667240000082
If not, the formula I has no solution, and the subcarrier can only be used by one URLLC device.
On the basis of the above embodiment, the accessing, to each subcarrier on the bandwidth of the internet of things system, a plurality of URLLC devices and a plurality of mtc devices simultaneously according to a preset power allocation algorithm based on the NOMA mechanism includes:
for each subcarrier on the bandwidth of the Internet of things system, selecting a plurality of target URLLC devices meeting the requirement of a first channel from a URLLC device set based on a NOMA mechanism, wherein the number of the target URLLC devices is less than or equal to the maximum number of the URLLC devices which can be accessed by the current subcarrier;
selecting a plurality of target mMTC devices which meet the requirements of a second channel from the mMTC device set;
and simultaneously accessing the target URLLC devices and the target mMTC devices according to a preset power distribution algorithm.
It can be understood that, in the embodiment of the present invention, after the number of URLLC devices accessing a subcarrier needs to be determined, an mtc device accessing the same subcarrier needs to be determined, and in the determination process, the URLLC devices need to meet a first channel requirement, and the mtc device needs to meet a second channel requirement. It should be noted that, the first channel requirement is a determination rule for accessing to the URLLC device in the embodiment of the present invention, and similarly, the second channel requirement is a determination rule for accessing to the mtc device in the embodiment of the present invention, which is not a requirement existing in an actual transmission channel.
Further, while determining the accessed target URLLC device, the embodiment of the present invention may determine the transmission power of the target URLLC device, so as to perform data transmission according to the determined transmission power. Similarly, when determining the accessed target mtc device, the embodiment of the present invention may determine the transmission power of the target mtc device, so as to perform data transmission according to the determined transmission power.
On the basis of the foregoing embodiment, the selecting, in the URLLC device set, a number of target URLLC devices that meet the first channel requirement includes:
sorting the URLLC devices which are not accessed in the URLLC device set from large to small according to the channel gain to obtain a first sequence;
and dividing the first two URLLC devices included in the first sequence into a small group, and taking the URLLC device meeting the first channel requirement in the small group as the target URLLC device.
As can be seen from the content of the foregoing embodiments, the embodiments of the present invention may calculate, for each subcarrier, that the subcarrier can access two URLLC devices. It should be noted that accessing two URLLC devices is a preferable manner, and the manner of accessing more may refer to the manner of accessing two devices, and the access number is not specifically limited in the embodiment of the present invention.
Then there are two cases that can be actually distinguished, one is to be able to access two URLLC devices, and one is to be able to access only one URLLC device.
For a device that can only access one URLLC device, it can be understood that in order to make the accessed device tolerate the interference caused by mtc as much as possible, a device with good channel conditions needs to be selected to use the subcarrier.
Then, the URLLC device selection method provided by the embodiment of the present invention specifically includes: and sequencing the unaccessed URLLC devices in the URLLC device set from large to small according to the channel gain to obtain a first sequence, wherein the first sequence arranged at the top is the URLLC device with the best channel condition, and the device is the target URLLC device in the embodiment of the invention.
Meanwhile, the transmitting power of the uniquely determined target URLLC device is PmaxAnd the corresponding, if any,
Figure BDA0001750667240000101
in another case, if both URLLC devices in the group meet the first channel requirement, the transmit power of the URLLC device with larger channel gain in the group is PmaxThe transmission power of the URLLC device with smaller channel gain in the group is:
Figure BDA0001750667240000102
wherein, PmaxIs the maximum transmit power, h, of the deviceaThe channel gain h of the URLLC device with larger channel gain in the groupbFor the channel gain, γ, of the URLLC device with the smaller channel gain within the subgroupuThe signal to interference plus noise ratio of the URLLC device signal.
On the basis of the foregoing embodiment, the selecting a number of target mtc devices in the mtc device set that satisfy the second channel requirement includes:
according to the channel gain, the mMTC devices which are not accessed in the mMTC device set are sequenced from small to large to obtain a second sequence;
determining the first Q mMTC devices corresponding to the second sequence when the requirement of a second channel is met, and taking the first Q mMTC devices corresponding to the second sequence as the target mMTC devices.
As can be seen from the foregoing embodiments, after determining the target URLLC device accessed by the subcarrier, the mtc device needs to be accessed as many as possible. The access procedure can be described by the formula:
Figure BDA0001750667240000111
and when an mtc device is allocated on each subcarrier, all accessed devices cannot be larger than the maximum interference that a URLLC device can tolerate on the subcarrier where the mtc device is located, that is:
Figure BDA0001750667240000112
meanwhile, the SINR requirements of each accessed mtc device need to be met:
Figure BDA0001750667240000113
suppose there are m mMTC devices and the maximum interference tolerance level IkThe URLLC devices share subcarriers, and the signal strengths from device 1 to m increase in order, they need to satisfy the following conditions, respectively:
Figure BDA0001750667240000114
it can be seen from the above formula that if the signal of each mtc device from 1 to n just meets its SINR requirement, it can make the mtc device meet the SINR requirement
Figure BDA0001750667240000115
As small as possible. The maximum transmission power of each device is limited, and the device can be informedThe device with good condition uses larger transmitting power to improve the strength of the access signal to endure the interference caused by other devices. Thus the above formula can be rewritten as: p is a radical ofm|hm|2≥γmMTC(γmMTC+1)m-1N0B. The number of devices that each mtc device can tolerate causing interference to it is:
Figure BDA0001750667240000116
the relationship between the signal strength of the mtc device and the maximum interference value that the URLLC device can tolerate at the kth subcarrier may be: i isk≥((γmMTC+1)n-1)N0B, the number of mtc devices that can share resources with URLLC under each subcarrier is at most:
Figure BDA0001750667240000121
the specific steps for determining the target mtc device may be represented as:
step 1, initializing an unaccessed mMTC device set, and enabling a channel gain value G of an element in M to be in accordance with
Figure BDA0001750667240000122
Conversion is performed. The channel gain value in M can be taken as w numerical values, the set T of the taken numerical values is that elements in T are arranged from large to small as { T1,t2,t3,...tw}。
And step 2, initializing k to be 0.
And 3, k is k +1, selecting the kth subcarrier from the set R, and initializing i to 0.
And 4, selecting a first element from the set M, giving a channel gain value of the first element to x, wherein i is i +1, and making Y equal to the number of elements of which the channel gain value in M is equal to x.
Step 5, when i<when w is true, let Q ═ min { x, t (i) -t (i +1), Y }, merge the first Q elements in the set M into the set Mk of mtc devices under the kth subcarrier, Mk ═ Mk ∪ { M1,M2,...MQAnd removing it from the set M, M ═ M/{ M1,M2,...MQAnd updating the set T.
Step 6, when i<If w is not satisfied, let Q be min { x, t (i), Y }, merge the first Q elements in the set M into the mtc device group set Mk under the kth subcarrier, Mk be Mk ∪ { M ═ M {1,M2,...MQAnd removing it from the set M, M ═ M/{ M1,M2,...MQAnd updating the set T.
And 7, returning to the step 3 when X >0 and i < w are simultaneously satisfied.
And 8, sorting the elements in the Mk from low to high according to the size of the channel gain value as Mk ═ M1,M2,...MQAnd transmitting power of the ith device is as follows:
Figure BDA0001750667240000131
and 9, judging whether k < card (R) is true or not, if so, returning to the step 2, and if not, finishing the grouping process of the mMTC equipment.
It can be understood that, through the mtc device grouping process, a target mtc device to be accessed and the transmission power of each target mtc device can be determined.
Wherein, in the first Q mtc devices corresponding to the second sequence, the transmission power of the ith mtc device is:
Figure BDA0001750667240000132
wherein, γmSignal to interference plus noise ratio, N, for mMTC device signals0To noise power spectral density, hiIs the channel gain of the ith mtc device.
Fig. 2 is a structural diagram of an access control system in a coexistence scenario of URLLC and mtc according to an embodiment of the present invention, as shown in fig. 2, the system includes: an access control module 210, wherein:
the access control module 210 is configured to access, to each subcarrier on the bandwidth of the internet of things system, a plurality of URLLC devices and a plurality of mtc devices simultaneously according to a preset power allocation algorithm based on an uplink non-orthogonal multiple access (NOMA) mechanism.
Specifically, how to perform access control on the coexistence scenario of URLLC and mtc through the access control module 210 may be used to execute the technical scheme of the embodiment of the access control method in the coexistence scenario of URLLC and mtc shown in fig. 1, and the implementation principle and the technical effect are similar, which is not described herein again.
According to the access control system under the coexisting scene of the URLLC and the mMTC, the NOMA technology is used, and the multiple URLLC devices and the multiple mMTC devices share the same subcarrier according to the preset power distribution rule, so that the Internet of things system can support higher connection density, and the spectrum efficiency is improved.
The embodiment of the invention provides access control equipment under a URLLC and mMTC coexistence scene, which comprises: at least one processor; and at least one memory communicatively coupled to the processor, wherein:
fig. 3 is a structural block diagram of an access control device in a coexistence scenario of URLLC and mtc according to an embodiment of the present invention, and referring to fig. 3, the access control device in the coexistence scenario of URLLC and mtc includes: 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 processor 310 may call logic instructions in the memory 330 to perform the following method: and for each subcarrier on the bandwidth of the Internet of things system, simultaneously accessing a plurality of URLLC devices and a plurality of mMTC devices according to a preset power distribution algorithm based on an uplink non-orthogonal multiple access (NOMA) mechanism.
An embodiment of the present invention discloses a computer program product, which includes a computer program stored on a non-transitory computer readable storage medium, the computer program including program instructions, when the program instructions are executed by a computer, the computer can execute the methods provided by the above method embodiments, for example, the method includes: and for each subcarrier on the bandwidth of the Internet of things system, simultaneously accessing a plurality of URLLC devices and a plurality of mMTC devices according to a preset power distribution algorithm based on an uplink non-orthogonal multiple access (NOMA) mechanism.
Embodiments of the present invention provide a non-transitory computer-readable storage medium, which stores computer instructions, where the computer instructions cause the computer to perform the methods provided by the above method embodiments, for example, the methods include: and for each subcarrier on the bandwidth of the Internet of things system, simultaneously accessing a plurality of URLLC devices and a plurality of mMTC devices according to a preset power distribution algorithm based on an uplink non-orthogonal multiple access (NOMA) mechanism.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
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 (9)

1. An access control method under a URLLC and mMTC coexistence scene is characterized by comprising the following steps:
for each subcarrier on the bandwidth of the Internet of things system, simultaneously accessing a plurality of URLLC devices and a plurality of mMTC devices according to a preset power distribution algorithm based on an uplink non-orthogonal multiple access (NOMA) mechanism;
the method for simultaneously accessing a plurality of URLLC devices and a plurality of mMTC devices according to a preset power allocation algorithm on the basis of an uplink non-orthogonal multiple access (NOMA) mechanism for each subcarrier on the bandwidth of the Internet of things system comprises the following steps:
for each subcarrier on the bandwidth of the Internet of things system, selecting a plurality of target URLLC devices meeting the requirement of a first channel from a URLLC device set based on a NOMA mechanism, wherein the number of the target URLLC devices is less than or equal to the maximum number of the URLLC devices which can be accessed by the current subcarrier;
selecting a plurality of target mMTC devices which meet the requirements of a second channel from the mMTC device set;
and simultaneously accessing the target URLLC devices and the target mMTC devices according to a preset power distribution algorithm.
2. The method according to claim 1, wherein before the simultaneously accessing a plurality of URLLC devices and a plurality of mtc devices according to a preset power allocation algorithm based on an uplink non-orthogonal multiple access (NOMA) mechanism for each subcarrier on the internet of things system bandwidth, the method further comprises:
and determining the maximum number of URLLC devices which can be accessed by each subcarrier on the bandwidth of the Internet of things.
3. The method of claim 1, wherein selecting a number of target URLLC devices in a set of URLLC devices that meet a first channel requirement comprises:
sorting the URLLC devices which are not accessed in the URLLC device set from large to small according to the channel gain to obtain a first sequence;
and dividing the first two URLLC devices included in the first sequence into a small group, and taking the URLLC device meeting the first channel requirement in the small group as the target URLLC device.
4. The method of claim 3, wherein if both URLLC devices in the group meet the first channel requirement, the transmit power of the URLLC device with larger channel gain in the group is PmaxThe transmission power of the URLLC device with smaller channel gain in the group is:
Figure FDA0002330974860000021
wherein, PmaxIs the maximum transmit power, h, of the deviceaThe channel gain h of the URLLC device with larger channel gain in the groupbFor the channel gain, γ, of the URLLC device with the smaller channel gain within the subgroupuThe signal to interference plus noise ratio of the URLLC device signal.
5. The method of claim 1, wherein selecting a number of target mMTC devices in a set of mMTC devices that meet a second channel requirement comprises:
according to the channel gain, the mMTC devices which are not accessed in the mMTC device set are sequenced from small to large to obtain a second sequence;
determining the first Q mMTC devices corresponding to the second sequence when the requirement of a second channel is met, and taking the first Q mMTC devices corresponding to the second sequence as the target mMTC devices.
6. The method according to claim 5, wherein the transmission power of the ith mMTC device in the first Q mMTC devices corresponding to the second sequence is:
Figure FDA0002330974860000022
wherein, γmSignal to interference plus noise ratio, N, for mMTC device signals0To noise power spectral density, hiIs the channel gain of the ith mtc device.
7. An access control system in a coexistence scenario of URLLC and mtc, comprising:
the access control module is used for simultaneously accessing a plurality of URLLC devices and a plurality of mMTC devices according to a preset power distribution algorithm on the basis of an uplink non-orthogonal multiple access (NOMA) mechanism for each subcarrier on the bandwidth of the Internet of things system;
the method for simultaneously accessing a plurality of URLLC devices and a plurality of mMTC devices according to a preset power allocation algorithm on the basis of an uplink non-orthogonal multiple access (NOMA) mechanism for each subcarrier on the bandwidth of the Internet of things system comprises the following steps:
for each subcarrier on the bandwidth of the Internet of things system, selecting a plurality of target URLLC devices meeting the requirement of a first channel from a URLLC device set based on a NOMA mechanism, wherein the number of the target URLLC devices is less than or equal to the maximum number of the URLLC devices which can be accessed by the current subcarrier;
selecting a plurality of target mMTC devices which meet the requirements of a second channel from the mMTC device set;
and simultaneously accessing the target URLLC devices and the target mMTC devices according to a preset power distribution algorithm.
8. An access control device under the coexistence scene of URLLC and mMTC is characterized by comprising a memory and a processor, wherein the processor and the memory complete mutual communication through a bus; 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 6.
9. A non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform the method of any one of claims 1 to 6.
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