CN111586867B - Resource allocation method and device of SCMA (sparse code multiple access) system - Google Patents

Abstract

Embodiments of the present invention provide a resource allocation method and device for an SCMA system. The above method includes: sending a downlink reference signal to each terminal device based on subcarrier resources, receiving each first transmission quality information sent by each terminal device, and predicting The theoretical transmission rate when each codebook resource transmits data to each terminal device; according to the theoretical transmission rate and the historical average transmission rate of each terminal device, determine the priority of allocating the codebook resource to the terminal device; and determine the priority based on each codebook resource second transmission quality information when data is transmitted to each terminal device; codebook resources are allocated to each terminal device based on the priority and the second transmission quality information. When the solution provided in this embodiment is applied to allocate the resources of the SCMA system, the efficiency of allocating codebook resources to the terminal equipment can be improved, thereby improving the quality of the service provided for the terminal equipment.

Description

A kind of resource allocation method and device of SCMA system

technical field

The present invention relates to the technical field of wireless communication, and in particular, to a resource allocation method and device of an SCMA system.

Background technique

More and more terminal devices of users need to access the base station to realize communication. SCMA (Sparse Code MultipeAccess, sparse code division multiple access technology), as a non-orthogonal multiple access technology, can enable a large number of terminal devices to access the base station . In an SCMA system based on SCMA technology, when a base station provides communication services for each terminal device, it transmits data to each terminal device based on each codebook resource, thereby providing communication services to users. Therefore, before transmitting data to each terminal device, the base station needs to allocate resources of the SCMA system, and allocate codebook resources to each terminal device.

In the prior art, when the base station allocates codebook resources to each terminal device, the allocation is based on the transmission quality of each codebook resource when transmitting data to each terminal device. For example, assuming that the transmission quality of data transmitted to the terminal equipment UE1 based on the codebook resource S is better than the transmission quality of the data transmitted to the terminal equipment UE2, the codebook resource S can be determined as the codebook resource for data transmission to the terminal equipment UE1.

However, since the base station allocates codebook resources based on the transmission quality of each codebook resource when transmitting data to each terminal device, if the transmission quality of data transmission to a terminal device is always poor, it is difficult for the terminal device to allocate the codebook resources. to the codebook resource. In particular, when the number of terminal devices is much larger than the codebook resources, the terminal device may be unable to allocate the codebook resources for a long time, thus making it difficult to obtain communication services, which will cause the base station to allocate codebook resources to some terminal devices. The efficiency is low, and further, the quality of the service provided by the base station for these terminal equipment will also be reduced.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a resource allocation method and apparatus for an SCMA system, so as to improve the efficiency of allocating codebook resources to terminal equipment, thereby improving the quality of services provided to the terminal equipment. The specific technical solutions are as follows:

In a first aspect, an embodiment of the present invention provides a resource allocation method for an SCMA system, the method comprising:

Send downlink reference signals to each terminal device based on the subcarrier resources, so that each terminal device predicts, according to the received downlink reference signal, first transmission quality information when transmitting data to each terminal device itself based on the subcarrier resources;

Receive each first transmission quality information sent by each terminal device, and predict, according to the received first transmission quality information, a first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource, wherein the codebook The resources include at least one subcarrier resource;

Determine the priority of allocating each codebook resource to each terminal device according to the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device;

According to the predicted first theoretical transmission rate and the preset minimum transmission rate for transmitting data to each terminal device, determine the second transmission quality information when transmitting data to each terminal device based on each codebook resource;

Based on the determined priority and the second transmission quality information, codebook resources are allocated to each terminal device.

In an embodiment of the present invention, the first transmission quality information includes: a signal-to-noise ratio of at least one subcarrier resource,

The receiving each first transmission quality information sent by each terminal device, and predicting, according to the received first transmission quality information, the first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource, including:

Receive the signal-to-noise ratio of each subcarrier resource sent by each terminal device;

For each codebook resource, according to the received signal-to-noise ratio of each subcarrier resource included in the codebook resource, calculate the second theoretical transmission when data is transmitted to each terminal device based on each subcarrier resource included in the codebook resource For each terminal device, among the second theoretical transmission rates when transmitting data to the terminal device based on each subcarrier resource included in the codebook resource, a preset statistical analysis method is used to select a minimum second theoretical transmission rate rate, as the first theoretical transmission rate when transmitting data to the terminal device based on the codebook resource.

In an embodiment of the present invention, for each codebook resource, according to the received signal-to-noise ratio of each subcarrier resource included in the codebook resource, the calculation method based on each subcarrier resource included in the codebook resource to each terminal is calculated. The second theoretical transfer rate when the device transmits data, including:

Calculate the second theoretical transmission rate according to the following expression:

r _u,l (n)=B*log(1+SNR _u,l )

Where, u is the serial number of the terminal device, l is the serial number of the subcarrier resource, SNR _u,l is the signal-to-noise ratio of the lth subcarrier resource when transmitting data to the uth terminal device based on the lth subcarrier resource, and B is the subcarrier resource. Carrier frequency bandwidth, n is the sequence number of the transmission time interval, r _u,l (n) is the second theoretical transmission rate when data is transmitted to the uth terminal device based on the lth subcarrier resource in the nth transmission time interval.

In an embodiment of the present invention, the above-mentioned determining the priority of allocating each codebook resource to each terminal device according to the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device includes:

Calculate the ratio between the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device, determine the arrangement identifier of the calculated ratio according to the preset arrangement order, and use the determined identifier as the assignment of each codebook resource to each codebook resource. The priority of each end device.

In an embodiment of the present invention, the second transmission quality when transmitting data to each terminal device based on each codebook resource is determined according to the predicted first theoretical transmission rate and the preset minimum transmission rate for transmitting data to each terminal device. information, including:

For each terminal device, determine whether the first theoretical transmission rate when transmitting data to the terminal device based on the codebook resource is less than the preset minimum transmission rate for transmitting data to the terminal device;

If yes, according to the number of terminal devices, predict the second transmission quality information when data is transmitted to the terminal device based on the codebook resources;

If no, the preset transmission quality information is determined as the second quality information when data is transmitted to the terminal device based on the codebook resource.

In an embodiment of the present invention, the above-mentioned allocation of codebook resources to each terminal device based on the determined priority and the second transmission quality information includes:

For each terminal device, the weight of each codebook resource allocated to the terminal device is determined according to the priority of each codebook resource allocated to the terminal device and the second transmission quality information when each codebook resource transmits data to the terminal device ;

Based on the determined weights, codebook resources are allocated to each terminal device.

In an embodiment of the present invention, the above-mentioned allocation of codebook resources to each terminal device based on the determined priority and the second transmission quality information includes:

Based on the determined priority and the second transmission quality information, the Hungarian algorithm is used to allocate codebook resources to each terminal device.

In a second aspect, an embodiment of the present invention provides an apparatus for resource allocation of an SCMA system, the apparatus comprising:

A signal sending module, configured to send a downlink reference signal to each terminal device based on the subcarrier resources, so that each terminal device predicts, according to the received downlink reference signal, the first transmission quality information when transmitting data to each terminal device itself based on the subcarrier resources ;

A rate prediction module, configured to receive each first transmission quality information sent by each terminal device, and predict, according to the received first transmission quality information, a first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource, Wherein, the codebook resource includes at least one subcarrier resource;

a priority determining module, configured to determine the priority of allocating each codebook resource to each terminal device according to the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device;

a quality information determination module, configured to determine, according to the predicted first theoretical transmission rate and the preset minimum transmission rate for transmitting data to each terminal device, the second transmission quality information when transmitting data to each terminal device based on each codebook resource;

The codebook resource allocation module is configured to allocate codebook resources to each terminal device based on the determined priority and the second transmission quality information.

In an embodiment of the present invention, the first transmission quality information includes: a signal-to-noise ratio of at least one subcarrier resource,

The rate prediction module includes:

a signal-to-noise ratio receiving sub-module, configured to receive the signal-to-noise ratio of each subcarrier resource sent by each terminal device;

The rate prediction submodule is used for, for each codebook resource, according to the received signal-to-noise ratio of each subcarrier resource included in the codebook resource, calculate the transmission to each terminal device based on each subcarrier resource included in the codebook resource The second theoretical transmission rate when data is used, and for each terminal device, the preset statistical analysis method is used in the second theoretical transmission rate when data is transmitted to the terminal device based on each subcarrier resource included in the codebook resource. A second theoretical transmission rate is selected as the first theoretical transmission rate when transmitting data to the terminal device based on the codebook resource.

In an embodiment of the present invention, the above-mentioned rate prediction sub-module is specifically configured to calculate the second theoretical transmission rate according to the following expression:

r _u,l (n)=B*log(1+SNR _u,l )

Where, u is the serial number of the terminal device, l is the serial number of the subcarrier resource, SNR _u,l is the signal-to-noise ratio of the lth subcarrier resource when transmitting data to the uth terminal device based on the lth subcarrier resource, and B is the subcarrier resource. Carrier frequency bandwidth, n is the sequence number of the transmission time interval, r _u,l (n) is the second theoretical transmission rate when data is transmitted to the uth terminal device based on the lth subcarrier resource in the nth transmission time interval.

In an embodiment of the present invention, the above-mentioned priority determination module is specifically configured to calculate the ratio between the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device, and determine the calculated ratio according to a preset order. The identified identifier is used as the priority for allocating each codebook resource to each terminal device.

In an embodiment of the present invention, the quality information determination module is specifically configured to, for each terminal device, determine whether the first theoretical transmission rate when transmitting data to the terminal device based on the codebook resources is smaller than the data transmission rate to the terminal device. Preset the minimum transmission rate; if yes, predict the second transmission quality information when transmitting data to the terminal device based on codebook resources according to the number of terminal devices; if no, determine the preset transmission quality information to be based on the codebook The second quality information when the resource transmits data to the terminal device.

In an embodiment of the present invention, the above codebook resource allocation module is specifically configured to, for each terminal device, according to the priority of each codebook resource allocated to the terminal device and the priority of each codebook resource when transmitting data to the terminal device In the second transmission quality information, the weight of each codebook resource allocated to the terminal device is determined; based on the determined weight, the codebook resource is allocated to each terminal device.

In an embodiment of the present invention, the above codebook resource allocation module is specifically configured to use the Hungarian algorithm to allocate codebook resources to each terminal device based on the determined priority and the second transmission quality information.

In a third aspect, an embodiment of the present invention provides a base station, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

memory for storing computer programs;

The processor is configured to implement the method steps described in the first aspect above when executing the program stored in the memory.

In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the method steps described in the first aspect are implemented .

It can be seen from the above that when the solution provided by the embodiment of the present invention is applied to allocate the resources of the SCMA system, the codebook resources are allocated to each terminal device according to the determined priority and the second transmission quality information, and the above priority is It is determined according to the predicted first theoretical transmission rate and the historical average transmission rate when data is transmitted to each terminal device based on each codebook resource, and because the above-mentioned first theoretical transmission rate can be used to indicate that each codebook resource transmits data to each terminal The transmission rate when the device transmits data, and the historical average transmission rate of each terminal device can be used to represent the historically allocated resources of each terminal device. Therefore, when determining to allocate codebook resources to each terminal device according to the determined priority, On the basis that each terminal device can be allocated to the codebook resources as much as possible, the transmission rate when data is transmitted to the terminal device based on the allocated codebook resources can be improved. Therefore, compared with the prior art, the efficiency of allocating codebook resources for the terminal equipment by the base station is improved, thereby improving the quality of the service provided for the terminal equipment.

In addition, since the second transmission quality information is used to characterize the transmission quality when data is transmitted to each terminal device based on each codebook resource, when codebook resources are allocated to each terminal device based on the second transmission quality information, it is possible to make the allocation based on the allocated codebook resources. The codebook resources provided to the terminal equipment have higher service quality of the service requested by the terminal equipment. Therefore, the efficiency of allocating codebook resources for the terminal equipment by the base station is improved, and the service quality of the terminal equipment service provided to the terminal equipment based on the allocated codebook resources is also higher, which further improves the communication service for each terminal equipment. service quality.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic flowchart of a first method for resource allocation in an SCMA system according to an embodiment of the present invention;

2 is a signaling interaction diagram of a resource allocation method of an SCMA system according to an embodiment of the present invention;

3 is a schematic flowchart of a second method for resource allocation in an SCMA system according to an embodiment of the present invention;

4 is a schematic diagram of an efficient channel ratio according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a comparison of system throughput according to an embodiment of the present invention;

6 is a schematic diagram of a comparison of fairness of allocated codebook resources according to an embodiment of the present invention;

7 is a schematic diagram of a comparison of the number of valid users provided by an embodiment of the present invention;

8 is a schematic structural diagram of a resource allocation apparatus of an SCMA system according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a base station according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1 , FIG. 1 is a schematic flowchart of a first method for resource allocation of an SCMA system according to an embodiment of the present invention. The foregoing method includes S101-S105.

S101: Send a downlink reference signal to each terminal device based on subcarrier resources, so that each terminal device predicts, according to the received downlink reference signal, first transmission quality information when transmitting data to each terminal device based on subcarrier resources.

The above-mentioned subcarrier resources can be understood as: resources used for signal transmission.

The above-mentioned terminal devices may be mobile phones, tablet computers, computers and other devices used by users.

The above-mentioned downlink reference signal is a signal sent by the base station to the terminal device and used for estimating the transmission quality when transmitting data.

Specifically, when sending the downlink reference signal to each terminal device based on the subcarrier resources, the base station can simultaneously send the downlink reference signal to each terminal device based on the subcarrier resource, and can also send the downlink reference signal to each terminal device sequentially based on the subcarrier resource.

Since the difference in transmission quality of downlink reference signals transmitted based on closely spaced subcarrier resources is small, when sending downlink reference signals to each terminal device based on subcarrier resources, it is possible to transmit downlink reference signals based on subcarrier resources with a large space between subcarrier resources. The resource sends downlink reference signals to each terminal device.

The above-mentioned first transmission quality information is used to indicate the transmission quality when data is transmitted to each terminal device itself based on the subcarrier resources.

In an embodiment of the present invention, the above-mentioned first transmission information may include: a signal-to-noise ratio of at least one subcarrier resource.

When the terminal equipment predicts, according to the received downlink reference signal, the first transmission quality information when transmitting data to each terminal equipment itself based on the subcarrier resources, the above-mentioned first transmission quality information can be predicted according to any method in the prior art.

S102: Receive each first transmission quality information sent by each terminal device, and predict, according to the received first transmission quality information, a first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource.

The above codebook resources can be understood as: resources used for signal transmission. Since a channel is also a resource for transmitting signals, the above codebook resource can also be simply understood as a channel.

个码本资源，其中，

为码本资源的数量，n为子载波资源的数量，d_v为每个码本资源包括的子载波数量。The above codebook resources include at least one subcarrier resource. Specifically, the codebook resources may be determined according to the subcarrier resources in the SCMA system. For example, n consecutive subcarrier resources can be grouped into a group, and SCMA coding technology can be applied to the subcarrier resources of each group after the grouping to generate

codebook resources, where,

is the number of codebook resources, n is the number of subcarrier resources, and d _v is the number of subcarriers included in each codebook resource.

The above-mentioned first theoretical transmission rate when transmitting data to each terminal device based on each codebook resource can be understood as: the transmission rate of the base station when transmitting service data to each terminal device based on each codebook resource.

Since the above-mentioned first transmission quality information is used to indicate the transmission quality when transmitting signals to each terminal device based on each subcarrier resource, and the codebook resource includes at least one subcarrier resource, the base station according to the received first transmission quality information , the first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource can be predicted.

Specifically, when the above-mentioned first transmission quality information is represented by the signal-to-noise ratio of each subcarrier resource when transmitting a signal to each terminal device based on the subcarrier resource, the Shannon formula can be used to calculate the data transmitted to each terminal device based on each codebook resource The first theoretical transfer rate at .

After predicting the first theoretical transmission rate when transmitting data to each terminal device based on each codebook resource, a first theoretical transmission rate matrix can be constructed according to each predicted first theoretical transmission rate. The transmission rate when each codebook resource transmits data to each terminal device, therefore, the above matrix may also be called a user-codebook rate matrix.

S103: Determine the priority of allocating each codebook resource to each terminal device according to the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device.

Since the allocation of codebook resources is performed at each TTI (Transmission Time Interval, transmission time interval) moment, assuming that the moment of current resource allocation is time n, the above-mentioned historical average of data transmission to each terminal device based on each codebook resource The transmission rate can be understood as: the average real-time transmission rate when the base station transmits data to each terminal device based on the allocated codebook resources during the period from time TT1 1 to time TTI(n-1). The above TTI 1 time represents the time when the codebook resources are allocated for the first time, and the TTI(n-1) time represents the time when the codebook resources are allocated for the n-1 th time, that is, the previous time when the codebook resources are currently allocated.

Specifically, the historical average transmission rate T _u (n) of each of the above-mentioned terminal devices can be calculated according to the following formula.

When n=1, _{Tu (n)=r u (} n).

When n=2,3,...,N,

Among them, u is the serial number of the terminal device, n is the serial number of the transmission time interval, T _u (n) is the historical average transmission rate of the u-th terminal device during the n-th transmission time interval, and T _u (n-1) is the th The historical average transmission rate of the u-th terminal device at n-1 transmission time intervals, r _u (n) is the actual transmission rate of the u-th terminal device at the n-th transmission time interval, and r _u (n-1) is The actual transmission rate of the uth terminal device at the n-1th transmission time interval.

The aforementioned priorities of each codebook resource allocated to each terminal device are used to determine the sequence in which each codebook resource is allocated to each terminal device. When the priority of the codebook resource allocated to one terminal device is higher than that of another terminal device, it means that the codebook resource is preferentially allocated to the former terminal device.

Since the above-mentioned first theoretical transmission rate can be used to represent the transmission rate when each codebook resource transmits data to each terminal device, and the historical average transmission rate of each terminal device can be used to represent the historically allocated resources of each terminal device, therefore, In order to improve the data transmission rate and enable each terminal device to be allocated codebook resources as much as possible, it is possible to determine the allocation of each codebook resource based on the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device. Priority given to individual end devices. For example, the priority of allocating each codebook resource to each terminal device may be determined according to the weight of the first theoretical transmission rate and the weight of the historical average transmission rate of each terminal device.

After the priority of allocating each codebook resource to each terminal device is determined, a priority matrix may be constructed according to the priority of each codebook resource allocated to each terminal device. Specifically, when constructing the matrix, each row represents each terminal device, each column represents each codebook resource, and for each codebook resource, each element value is determined according to the priority assigned to each terminal device by the codebook resource. Since the above priority represents the priority of allocating each codebook resource to each terminal device, the above matrix may also be called a user-codebook priority matrix.

S104: According to the predicted first theoretical transmission rate and the preset minimum transmission rate for transmitting data to each terminal device, determine second transmission quality information when transmitting data to each terminal device based on each codebook resource.

The above-mentioned preset minimum transmission rate for data transmission to each terminal device may be: GBR (Guaranted Bit Rate, guaranteed bit rate) of each terminal device.

The foregoing second transmission quality information when data is transmitted to each terminal device based on each codebook resource is used to represent the transmission quality when data is transmitted to each terminal device based on each codebook resource.

The above-mentioned second transmission quality information can be represented by a quality score. When the transmission quality of the codebook resource when transmitting data to the terminal device is poor, the quality score is low; when the transmission quality of the codebook resource when transmitting data to the terminal device is good. , with a higher quality score.

Specifically, when the first theoretical transmission rate when transmitting data to the terminal equipment based on the codebook resources is lower than the preset minimum transmission rate for transmitting data to the terminal equipment, it means that the expected transmission requirements cannot be met based on the codebook resources.

When the first theoretical transmission rate when transmitting data to the terminal device based on the codebook resource is higher than the preset minimum transmission rate for transmitting data to the terminal device, it means that the service requested by the terminal device is provided to the terminal device based on the codebook resource business quality is high.

Therefore, the second transmission quality information when transmitting data to each terminal device based on each codebook resource can be determined according to the predicted first theoretical transmission rate and the preset minimum transmission rate for transmitting data to each terminal device.

When determining the second transmission quality information when transmitting data to each terminal device based on each codebook resource, a second transmission quality information matrix may be constructed according to the determined second transmission quality information. Since the above-mentioned second transmission quality information can be characterized by a quality score, a user-codebook quality score matrix can be constructed.

S105: Allocate codebook resources to each terminal device based on the determined priority and the second transmission quality information.

Based on the above analysis, it can be seen that when allocating codebook resources to each terminal device based on the determined priority, on the basis that each terminal device can be allocated to the codebook resources as much as possible, it is possible to improve the codebook resources based on the allocated codebook resources. The transmission rate when transmitting data to the end device. The second transmission quality information is used to characterize the transmission quality when data is transmitted to each terminal device based on each codebook resource. When codebook resources are allocated to each terminal device based on the second transmission quality information, it is This resource provides the terminal equipment with the service requested by the terminal equipment with high service quality. Therefore, based on the determined priority and the second transmission quality information, when allocating codebook resources to each terminal device, on the basis that each terminal device can be allocated to the codebook resources as much as possible, it is possible to improve the performance based on the allocated codebook resources. The transmission rate when this resource transmits data to the terminal device also makes the service quality of the terminal device service provided to the terminal device based on the allocated codebook resources higher.

In an embodiment of the present invention, the allocation of codebook resources to each terminal device based on the determined priority and the second transmission quality information in the above S105 may be implemented in the following manner.

For each terminal device, the weight of each codebook resource allocated to the terminal device is determined according to the priority of each codebook resource allocated to the terminal device and the second transmission quality information when each codebook resource transmits data to the terminal device ; Based on the determined weights, codebook resources are allocated to each terminal device.

When determining the weight of each codebook resource allocated to each terminal device, for each terminal device, the priority of each codebook resource allocated to the terminal device and the second priority when each codebook resource transmits data to the terminal device can be calculated. The sum of the transmission quality information can also be calculated as an average value between the priority assigned to the terminal device by each codebook resource and the second transmission quality information when each codebook resource transmits data to the terminal device.

In an embodiment of the present invention, a weight matrix may also be constructed according to the determined weights of each codebook resource allocated to each terminal device. The above weight matrix may also be referred to as a user-codebook weight matrix.

Specifically, when constructing the matrix, each row represents each terminal device, each column represents each codebook resource, and for each codebook resource, each element value is determined according to the weight assigned to each terminal device by the codebook resource.

For example, assuming that there are three codebook resources and three terminal devices, the priority range for assigning codebook resources to terminal devices is [1, 10], and 1 indicates the highest priority order, and 10 indicates the lowest priority order. The second transmission quality information of the data transmitted from the codebook resource to the terminal device is 1 or 100, where 1 indicates that the second transmission quality information is good, and 100 indicates that the second transmission quality information is poor.

Among them, the priority of the first codebook resource allocated to each terminal device is [1, 2, 3], and the transmission quality is [100, 1, 100], and the priority of the second codebook resource allocated to each terminal device is [ 3,1,2], the transmission quality is [100,1,100], the priority of the third codebook resource allocated to each terminal device is [1,2,3], and the transmission quality is [1,1,1] .

According to the above priority and the second transmission quality information, the weight matrix can be determined as:

Wherein, in the above weight matrix, the row represents each codebook resource, the column represents each terminal device, and each element value represents the weight of allocating the codebook resource corresponding to the row where the element is located to the terminal device corresponding to the column where the element is located value.

When allocating codebook resources to each terminal device based on the determined weight. It is possible to determine a variety of resource allocation schemes for allocating each codebook resource to each terminal device, determine the weight sum of each resource allocation scheme, and use the resource allocation scheme with the smallest weight sum as the final resource allocation scheme, so as to provide each terminal. The device allocates codebook resources.

For example, following the above example, there can be multiple resource allocation schemes.

A resource allocation scheme may be: allocating the codebook resources corresponding to the first row to the terminal equipment corresponding to the first column, allocating the codebook resources corresponding to the second row to the terminal equipment corresponding to the second column, and assigning the codebook resources corresponding to the third row to the terminal equipment corresponding to the second column. The corresponding codebook resources are allocated to the terminal equipment corresponding to the third column. According to the above matrix, the weight sum of the above resource allocation scheme can be calculated as: 101+2+4=107.

A resource allocation scheme may also be: allocating the codebook resources corresponding to the first row to the terminal equipment corresponding to the first column, allocating the codebook resources corresponding to the second row to the terminal equipment corresponding to the third column, and The codebook resource corresponding to the row is allocated to the terminal device corresponding to the second column. According to the above matrix, the weight sum of the above resource allocation scheme can be calculated as: 101+102+3=206.

According to this method, the weight sum of various resource allocation schemes can be calculated according to the above matrix, and the resource allocation scheme with the smallest weight sum can be selected as the final resource allocation scheme, thereby allocating resources to each terminal device according to the final resource allocation scheme.

It can be seen from the above that when applying the solution provided in this embodiment to allocate the resources of the SCMA system, the codebook resources are allocated to each terminal device according to the determined priority and the second transmission quality information, and the above priority is based on The predicted first theoretical transmission rate is determined based on the historical average transmission rate when each codebook resource transmits data to each terminal device, and because the above-mentioned first theoretical transmission rate can be used to indicate that each codebook resource is transmitted to each terminal device. The transmission rate when transmitting data, and the historical average transmission rate of each terminal device can be used to represent the historical resource allocation of each terminal device. Therefore, when the codebook resources are allocated to each terminal device according to the determined priority, the On the basis that each terminal device can be allocated to the codebook resources as much as possible, the transmission rate when data is transmitted to the terminal device based on the allocated codebook resources can be improved. Therefore, compared with the prior art, the efficiency of allocating codebook resources for the terminal equipment by the base station is improved, thereby improving the quality of the service provided for the terminal equipment.

In addition, since the second transmission quality information is used to characterize the transmission quality when data is transmitted to each terminal device based on each codebook resource, when codebook resources are allocated to each terminal device based on the second transmission quality information, it is possible to make the allocation based on the allocated codebook resources. The codebook resources provided to the terminal equipment provide the terminal equipment with the service requested by the terminal equipment with high service quality. Therefore, the efficiency of allocating codebook resources for the terminal equipment by the base station is improved, and the service quality of the terminal equipment service provided to the terminal equipment based on the allocated codebook resources is also higher, which further improves the communication service for each terminal equipment. service quality.

In an embodiment of the present invention, when the codebook resource includes at least one subcarrier resource, and the first transmission quality information includes the signal-to-noise ratio of at least one subcarrier resource, the receiving in S102 can be implemented according to the following steps A1-A3 Each first transmission quality information sent by each terminal device, and according to the received first transmission quality information, a first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource is predicted.

Step A1: Receive the signal-to-noise ratio of each subcarrier resource sent by each terminal device.

Since the codebook resource can include at least one subcarrier resource, after the base station sends the downlink reference signal to each terminal device based on each subcarrier resource, each terminal device can predict the transmission to itself based on each subcarrier resource according to the received downlink reference signal When the data is the signal-to-noise ratio of each sub-carrier resource, each terminal device sends the predicted signal-to-noise ratio of each sub-carrier resource to the base station.

Step A2: For each codebook resource, according to the received signal-to-noise ratio of each subcarrier resource included in the codebook resource, calculate the number of times when data is transmitted to each terminal device based on each subcarrier resource included in the codebook resource. Two theoretical transmission rates, and for each terminal equipment, among the second theoretical transmission rates when transmitting data to the terminal equipment based on each subcarrier resource included in the codebook resource, a preset statistical analysis method is used to select a second theoretical transmission rate. The theoretical transmission rate is used as the first theoretical transmission rate when data is transmitted to the terminal device based on the codebook resource.

Specifically, for each codebook resource, according to the received signal-to-noise ratio of each subcarrier resource included in the codebook resource, Shannon's formula can be used to calculate the transmission to each terminal device based on each subcarrier resource included in the codebook resource The second theoretical transfer rate for data.

In one embodiment of the present invention, the second theoretical transmission rate can be calculated according to the following expression.

r _u,l (n)=B*log(1+SNR _u,l )

Where, u is the serial number of the terminal device, l is the serial number of the subcarrier resource, SNR _u,l is the signal-to-noise ratio of the lth subcarrier resource when transmitting data to the uth terminal device based on the lth subcarrier resource, and B is the subcarrier resource. Carrier frequency bandwidth, n is the sequence number of the transmission time interval, r _u,l (n) is the second theoretical transmission rate when data is transmitted to the uth terminal device based on the lth subcarrier resource in the nth transmission time interval.

In this way, for each codebook resource, the above formula can more accurately calculate the second theoretical transmission rate when data is transmitted to each terminal device based on each subcarrier resource included in the codebook resource.

Specifically, the above-mentioned preset statistical analysis method may be: taking a minimum value, taking an average value, or taking a median value, and the like.

Taking the preset statistical analysis method as taking the minimum value as an example, it is assumed that the SCMA system includes the terminal equipment Ue1, and the two codebook resources are: S1 and S2, wherein S1 includes subcarrier resources S11 and S12, and S2 includes the subcarrier resources S11 and S12. Subcarrier resources S21 and S22.

The second theoretical transmission rate when data is transmitted to each terminal device based on each subcarrier resource is shown in Table 1 below.

Table 1

Ue1 Ue2 Subcarrier resource S11 R_{Ue1, S11} R_{Ue2, S11} Subcarrier resource S12 R_{Ue1, S12} R_{Ue2, S12} Subcarrier resource S21 R_{Ue1, S21} R_{Ue2, S21} Subcarrier resource S22 R_{Ue1, S22} R_{Ue2, S22}

Wherein, R _{Ue1 and S11} in the above Table 1 represent the second theoretical transmission rate when transmitting data to the terminal equipment Ue1 based on the subcarrier resource S11, and R _{Ue2 and S11} represent the second theoretical transmission rate when transmitting data to the terminal equipment Ue2 based on the subcarrier resource S12. Two theoretical transmission rates, similarly, R _{Ue1, S12} , R _{Ue1, S21} , R _{Ue1, S22} , R _{Ue2, S12} , R _{Ue2, S21} , R _{Ue2, S22} represent the data transmission rate to the terminal device based on each subcarrier resource The second theoretical transmission rate.

Based on the above Table 1, it can be determined that the first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource is shown in Table 2 below.

Table 2

Ue1 Ue2 Codebook Resource S1 Min(R_Ue1,S11,R_Ue1,S12) Min(R_Ue2,S11,R_Ue2,S12) Codebook resource S2 Min(R_Ue1,S21,R_Ue1,S22) Min(R_Ue2,S21,R_Ue2,S22)

Among them, Min(R _{Ue1, S11} , R _{Ue1, S12} ) in the above Table 2 represents the first theoretical transmission rate when transmitting data to the terminal equipment Ue1 based on the codebook resource S1, since R _{Ue1, S11} represents the subcarrier resource S11 The second theoretical transmission rate when the terminal equipment Ue1 transmits data, R _{Ue1, S12} represent the second theoretical transmission rate when transmitting data to the terminal equipment Ue1 based on the subcarrier resource S12, and the codebook resource S1 includes the subcarrier resources S11, S12, Therefore, the minimum value between R _{Ue1, S11} and R _{Ue1, S12} is taken as the first theoretical transmission rate when data is transmitted to the terminal device Ue1 based on the codebook resource S1. Similarly, Min(R _{Ue2, S11} , R _{Ue2, S12} ), Min(R _{Ue1, S21} , R _{Ue1, S22} ), Min(R _{Ue2, S21} , R _{Ue2, S22} ) are sent to each terminal based on each codebook resource The first theoretical transfer rate when the device transmits data.

In this way, since the codebook resource includes at least one subcarrier resource, and for each codebook resource, the second theoretical transmission rates when transmitting data to each terminal device based on each subcarrier resource included in the codebook resource are different, so the second theoretical transmission rate is different. , for each terminal equipment, among the second theoretical transmission rates when each subcarrier resource included in the codebook resource transmits data to the terminal equipment, a preset statistical analysis method is used to select a second theoretical transmission rate as the basis for the second theoretical transmission rate. The first theoretical transmission rate when the codebook resource transmits data to the terminal device can more accurately determine the first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource.

In an embodiment of the present invention, the above-mentioned S103 can be implemented in the following manner to determine the priority of allocating each codebook resource to each terminal device according to the predicted first theoretical transmission rate and the codebook resources that have been allocated to each terminal device class.

Calculate the ratio between the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device, determine the arrangement identifier of the calculated ratio according to the preset arrangement order, and use the determined identifier as the assignment of each codebook resource to each codebook resource. The priority of each end device.

In this way, the ratio between the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device is determined in accordance with the preset arrangement order to determine the arrangement identifier of the calculated ratio, and the determined identifier is used as the codebook resource for each codebook resource. The priority assigned to each terminal device, when the codebook resource is determined to be allocated to each terminal device according to the determined priority, on the basis that each terminal device can be allocated to the codebook resource as much as possible, it is possible to improve the performance based on the determined priority. The transmission rate when the allocated codebook resources transmit data to the terminal device

In an embodiment of the present invention, according to the predicted first theoretical transmission rate and the preset minimum transmission rate for data transmission to each terminal device in the above S104 can be implemented in the following manner, determining the transmission to each terminal device based on each codebook resource Second transmission quality information for data.

For each terminal device, determine whether the first theoretical transmission rate when transmitting data to the terminal device based on the codebook resources is less than the preset minimum transmission rate for transmitting data to the terminal device; if so, predict based on the number of terminal devices. The second transmission quality information when data is transmitted to the terminal device based on the codebook resource; if not, the preset transmission quality information is determined as the second quality information when data is transmitted to the terminal device based on the codebook resource.

Specifically, it is assumed that the above-mentioned second transmission quality information is represented by a quality score, and when the quality score is higher, it indicates that the transmission quality of the codebook resource when transmitting data to the terminal device is worse, and when the quality score is lower, it indicates that the codebook resource The better the transmission quality when transmitting data to the terminal equipment, therefore, when the predicted first theoretical transmission rate is less than the preset minimum transmission rate for transmitting data to each terminal equipment, the square or cube of the number of terminal equipment can be calculated, etc., The calculated value is determined as the second transmission quality information when data is transmitted to the terminal device based on the codebook resource.

When the predicted first theoretical transmission rate is greater than or equal to the preset minimum transmission rate for transmitting data to each terminal device, "1" may be determined as the second transmission quality information when transmitting data to the terminal device based on codebook resources.

In this way, according to the predicted first theoretical transmission rate and the preset minimum transmission rate for transmitting data to each terminal device, the second transmission quality information when transmitting data to each terminal device based on each codebook resource is determined, and based on the above-mentioned second transmission quality information When the quality information allocates codebook resources for each terminal device, it can make the transmission success rate higher when data is transmitted to the terminal device based on the allocated codebook resources.

On the basis of the foregoing embodiment, in an embodiment of the present invention, the codebook resource allocation to each terminal device based on the determined priority and the second transmission quality information in the foregoing S105 may also be implemented in the following manner.

Based on the determined priority and the second transmission quality information, the Hungarian algorithm is used to allocate codebook resources to each terminal device.

Specifically, when using the Hungarian algorithm to allocate codebook resources to each terminal device, the following steps may be followed.

Step 1: Determine the relationship between the number U of terminal devices and the number M of codebook resources in the SCMA system. When U<M, supplement the user-codebook weight matrix to M*M by adding 0; when U When ≥M, the user-codebook weight matrix is supplemented to a U*U matrix by supplementing 0. The above user-codebook weight matrix may be determined based on the user-codebook priority matrix and the user-codebook quality score matrix. For example, the sum of the user-codebook priority matrix and the user-codebook quality score matrix can be used as the user-codebook weight matrix.

Each of the following steps is to operate on the user-codebook weight matrix after 0-filling.

Step 2: For each row element, subtract the minimum value in the row element; and for each column element, subtract the minimum value in the column element.

Step 3: Traverse each row of elements, when there is only one independent 0 element in a row element, determine the independent 0 element as an independent 0 element, and mark the other 0 elements in the row and column where the 0 element is located as non-selectable 0 elements. The above independent 0 elements are: 0 elements that are not in the same row and in the same column as the selected independent 0 elements in the matrix. Follow the same operation to traverse each column of elements to determine the independent 0 elements and non-optional elements in each column.

When no new independent 0 element can be marked according to the method of the third step, go to the fourth step.

Step 4: Mark the remaining optional 0 elements with * as 0* elements.

Step 5: Traverse the elements of each row, determine the optional 0* element with the smallest column number in each row as an independent 0 element, and then mark the other 0* elements in the row and column where the element is located as non-optional elements, and obtain the pre- Select the matrix and mark all 0* elements as optional.

Step 6: Traverse each row of elements in the above pre-selection matrix. For the row without independent 0 elements, determine an optional 0* element in the row, record the first position of the element in the pre-selection matrix, and then in the An independent 0 element is determined in the column in the first position, the second position of the element in the preselected matrix is recorded, and the recursive operation is performed in the row in the second position.

When the end condition of the recursive operation is to find 0* elements, it is assumed that the position of the last independent 0 element in the preselected matrix is the third position. If the row in the third position is the first row, exit the operation on that row, and instead operate on the next row in the matrix. If the row in the third position is not the first row, delete the third position in the recorded pre-selection matrix and the position of the previous row of the third position, and then mark the 0* element at the position of the previous row of the third position is an optional element.

When the end condition of the recursive operation is to find an independent 0 element, the exchange operation is performed according to all the 0 elements recorded, that is, the 0* element is determined as the independent 0 element, and the independent 0 element is determined as the 0* element.

From the third step above to the sixth step above is used to find the maximum number of independent 0 elements.

Step 7: For the matrix obtained in step 6, traverse each row of elements. When a row has no independent 0 elements, mark the row as 1, and then check whether there are other 0 elements in the column. If there is, mark the column as 1, and perform the above operation on the row element where each 0 element is located, if not, end the operation. Continue to traverse each row element of the matrix, unmark the row elements marked as 1, and mark the row elements not marked as 1 as 1.

Step 8: Find elements in the matrix where all rows and columns are not marked as 1, and record the minimum element value. If there are no elements whose rows and columns are not marked as 1, go to the next step; if there is , subtract the recorded minimum element value from all element values on the row not marked 1, add all element values on the row marked 1 with the recorded minimum element value, and start executing the third step above.

The ninth step, initialize an allocation matrix Alloc_scheme of the same size as the pre-selection matrix, and assign a value of 1 at the same position of the above Alloc_scheme according to the position of each independent 0 element.

Among them, the position of the element whose matrix element is 1 is (u, m), u is the serial number of the codebook resource, m is the serial number of the terminal device, (u, m) indicates that the mth codebook resource is allocated to the uth codebook resource. Terminal Equipment. At the same time, there is only one 1 in each row and each column of the matrix, which represents a one-to-one correspondence between terminal devices and codebook resources.

When U>M, the supplemented U-M column in the allocation matrix Alloc_scheme is deleted and reduced to U*M.

When U<M, according to the actual transmission rates of the U terminal devices, the remaining resources allocated to the M-U virtual terminal devices are reallocated to the terminal devices that do not meet the GBR requirement.

Specifically, a new GBR requirement can be reset for a terminal device that does not meet the preset GBR requirement, and when a new GBR requirement is reset for a terminal device, the preset GBR requirement can be corresponding to the terminal device The difference between the first theoretical transmission rates is taken as the new GBR requirement of the terminal equipment. After re-determining the new GBR requirement for the terminal device, traverse the process from the first step to the ninth step to realize the reallocation of the remaining resources.

Based on the matrix Alloc_scheme obtained in the ninth step, codebook resources can be allocated to each terminal device.

Referring to FIG. 2, FIG. 2 is a signaling interaction diagram of a method for allocating codebook resources in an SCMA system according to an embodiment of the present invention. The above method includes S201-S206.

FIG. 2 includes a base station and a UE (User Equipment, user equipment), and the above-mentioned user equipment may also be referred to as terminal equipment.

S201: The base station sends a downlink reference signal to the UE based on the subcarrier resources.

S202: The UE estimates the signal-to-noise ratio of each subcarrier resource according to the received downlink reference signal.

S203: The UE sends the estimated SNR to the base station.

S204: The base station determines, according to the received signal-to-noise ratio, the priority of allocating each codebook resource to the UE and the transmission quality information when transmitting data to the UE based on each codebook resource.

S205: Based on the determined priority and transmission quality information, allocate codebook resources to the UE.

S206: Transmit downlink data to the UE based on the allocated codebook resources.

Referring to FIG. 3 , FIG. 3 is a schematic flowchart of a second method for resource allocation of an SCMA system according to an embodiment of the present invention. The above method includes S301-S305.

S301: Obtain a user-codebook rate matrix.

The above-mentioned user-codebook rate matrix is: a matrix constructed according to each of the first theoretical transmission rates predicted in the above-mentioned S102.

S302: Obtain a user-codebook priority matrix.

The above-mentioned user-codebook priority matrix is: a matrix constructed according to the priorities of allocating each codebook resource to each terminal device determined in the above S103.

S303: Obtain a user-codebook quality matrix.

The above user-codebook quality matrix is: a matrix constructed according to the second transmission quality information when data is transmitted to each terminal device based on each codebook resource determined in the above S104.

S304: Obtain a user-codebook weight matrix.

The above user-codebook weight matrix is: a matrix obtained by performing matrix addition on the user-codebook priority matrix obtained in S302 and the user-codebook quality matrix obtained in S303.

S305: Use the Hungarian algorithm for the user-codebook weight matrix to allocate codebook resources to each terminal device.

The following are experimental simulation results when the solutions provided by the embodiments of the present invention and other solutions are used in allocating the resources of the SCMA system.

It is assumed that the SCMA system includes 6 codebook resources, the carrier frequency is 2GHz, the subcarrier spacing is 15KHz, and the frequency resource is 60 subcarriers. The channel model is a large-scale fading path loss model plus a small-scale fading Rayleigh channel.

The above path loss model uses the logarithmic distance loss model, and the loss when the reference distance is 1m is obtained by the Friis transmission formula.

The service radius of the cell is 500m, the users are randomly distributed in the area more than 40m away from the base station, and the user's moving speed is 0.556km/h. The total scheduling duration is 100 TTIs, and the user's GBR is set to the same value, 256kbps and 316kbps.

Referring to FIG. 4, FIG. 4 is a schematic diagram of an efficient channel ratio provided by an embodiment of the present invention. The abscissa is the number of users, and the ordinate is the ratio of high-efficiency channels. The above-mentioned ratio of high-efficiency channels is: the ratio of channels whose theoretical transmission rate is higher than GBR when transmitting data to users in each channel to the total number of channels. The solid line in FIG. 4 represents the high-efficiency channel ratio when the GBR is 316Kbps, and the dotted line represents the high-efficiency information ratio when the GBR is 256Kbps.

It can be seen from Figure 4 that the increase in the GBR requirement will reduce the proportion of efficient channels.

Referring to FIG. 5 , FIG. 5 is a schematic diagram for comparison of system throughput provided by an embodiment of the present invention. The horizontal axis is the number of users, and the vertical axis is the throughput rate, in Mbps. FIG. 5 compares the solution proposed in the embodiment of the present invention with the SCMA-PF solution when the GBR is 256Kbps and the GBR is 316Kbps, and the system throughput of each solution under different GBR requirements is obtained.

It can be seen from FIG. 5 that, with the increase of the number of users, the system throughput of the solution proposed in the embodiment of the present invention increases under different GBR requirements.

Referring to FIG. 6, FIG. 6 is a schematic diagram of a comparison of fairness of resource allocation provided by an embodiment of the present invention. The abscissa is the number of users, and the ordinate is the fairness index for allocating codebook resources. FIG. 6 compares the solution proposed in the embodiment of the present invention with the SCMA-PF solution when the GBR is 256Kbps and the GBR is 316Kbps, and obtains the fairness degree of resource allocation of each solution under different GBR requirements.

It can be seen from FIG. 6 that when the GBR is 256Kbps, the fairness of the solution proposed by the embodiment of the present invention does not decrease much; when the GBR is 316Kbps, the fairness of the solution proposed by the embodiment of the present invention decreases more as the number of users increases, but In the end, it stabilized above 0.9.

Referring to FIG. 7 , FIG. 7 is a schematic diagram for comparing the number of valid users according to an embodiment of the present invention. The horizontal axis is the number of users, and the vertical axis is the number of valid users.

The above-mentioned valid users refer to terminal devices whose actual transmission rate is not less than GBR when transmitting to each terminal device based on each codebook resource after each codebook resource allocation is completed.

FIG. 7 compares the solution proposed in the embodiment of the present invention with the SCMA-PF solution when the GBR is 256Kbps and the GBR is 316Kbps, and the number of valid users of each solution under different GBR requirements is obtained.

It can be seen from FIG. 7 that when the GBR is 256Kbps, the number of effective users of the solution proposed by the embodiment of the present invention can reach the maximum number of serviceable users. When the GBR is 316Kbps, with the increase of the number of users, the solution proposed by the embodiment of the present invention can make The number of effective users is gradually increased to the maximum number of users that can be served.

Corresponding to the codebook resource allocation method in the SCMA system, an embodiment of the present invention further provides a codebook resource allocation apparatus in the SCMA system.

Referring to FIG. 8, FIG. 8 is a schematic structural diagram of a resource allocation apparatus of an SCMA system according to an embodiment of the present invention. The above devices include 801-805.

A signal sending module 801 is configured to send a downlink reference signal to each terminal device based on the subcarrier resources, so that each terminal device predicts, according to the received downlink reference signal, the first transmission quality when transmitting data to each terminal device itself based on the subcarrier resources information;

The rate prediction module 802 is configured to receive each first transmission quality information sent by each terminal device, and according to the received first transmission quality information, predict the first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource , wherein the codebook resource includes at least one subcarrier resource;

a priority determining module 803, configured to determine the priority of allocating each codebook resource to each terminal device according to the predicted first theoretical transmission rate and the historical average transmission rate of each terminal;

A quality information determination module 804, configured to determine the second transmission quality information when transmitting data to each terminal device based on each codebook resource according to the predicted first theoretical transmission rate and the preset minimum transmission rate for transmitting data to each terminal device ;

The codebook resource allocation module 805 is configured to allocate codebook resources to each terminal device based on the determined priority and the second transmission quality information.

It can be seen from the above that when applying the solution provided in this embodiment to allocate the resources of the SCMA system, the codebook resources are allocated to each terminal device according to the determined priority and the second transmission quality information, and the above priority is based on The predicted first theoretical transmission rate is determined based on the historical average transmission rate when each codebook resource transmits data to each terminal device, and because the above-mentioned first theoretical transmission rate can be used to indicate that each codebook resource is transmitted to each terminal device. The transmission rate when transmitting data, and the historical average transmission rate of each terminal device can be used to represent the historical resource allocation of each terminal device. Therefore, when the codebook resources are allocated to each terminal device according to the determined priority, the On the basis that each terminal device can be allocated to the codebook resources as much as possible, the transmission rate when data is transmitted to the terminal device based on the allocated codebook resources can be improved. Therefore, compared with the prior art, the efficiency of allocating codebook resources for the terminal equipment by the base station is improved, thereby improving the quality of the service provided for the terminal equipment.

In addition, since the second transmission quality information is used to represent the transmission quality when data is transmitted to each terminal device based on each codebook resource, when codebook resources are allocated to each terminal device based on the second transmission quality information, it is possible to make the allocation based on the allocated codebook resources. The codebook resources provided to the terminal equipment provide the terminal equipment with the service requested by the terminal equipment with high service quality. Therefore, the efficiency of allocating codebook resources for the terminal equipment by the base station is improved, and the service quality of the terminal equipment service provided to the terminal equipment based on the allocated codebook resources is also higher, which further improves the communication service for each terminal equipment. service quality.

In an embodiment of the present invention, the first transmission quality information includes: a signal-to-noise ratio of at least one subcarrier resource,

The rate prediction module 802 includes:

a signal-to-noise ratio receiving sub-module, configured to receive the signal-to-noise ratio of each subcarrier resource sent by each terminal device;

The rate prediction submodule is used for, for each codebook resource, according to the received signal-to-noise ratio of each subcarrier resource included in the codebook resource, calculate the transmission to each terminal device based on each subcarrier resource included in the codebook resource The second theoretical transmission rate when data is used, and for each terminal device, the preset statistical analysis method is used in the second theoretical transmission rate when data is transmitted to the terminal device based on each subcarrier resource included in the codebook resource. A second theoretical transmission rate is selected as the first theoretical transmission rate when transmitting data to the terminal device based on the codebook resource.

In this way, since the codebook resource includes at least one subcarrier resource, and for each codebook resource, the second theoretical transmission rates when transmitting data to each terminal device based on each subcarrier resource included in the codebook resource are different, so the second theoretical transmission rate is different. , for each terminal equipment, among the second theoretical transmission rates when each subcarrier resource included in the codebook resource transmits data to the terminal equipment, a preset statistical analysis method is used to select a second theoretical transmission rate as the basis for the second theoretical transmission rate. The first theoretical transmission rate when the codebook resource transmits data to the terminal device can more accurately determine the first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource.

In an embodiment of the present invention, the above-mentioned rate prediction sub-module is specifically configured to calculate the second theoretical transmission rate according to the following expression:

r _u,l (n)=B*log(1+SNR _u,l )

Where, u is the serial number of the terminal device, l is the serial number of the subcarrier resource, SNR _u,l is the signal-to-noise ratio of the lth subcarrier resource when transmitting data to the uth terminal device based on the lth subcarrier resource, and B is the subcarrier resource. Carrier frequency bandwidth, n is the sequence number of the transmission time interval, r _u,l (n) is the second theoretical transmission rate when data is transmitted to the uth terminal device based on the lth subcarrier resource in the nth transmission time interval.

In an embodiment of the present invention, the above-mentioned priority determination module is specifically configured to calculate the ratio between the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device, and determine the calculated ratio according to a preset order. The identified identifier is used as the priority for allocating each codebook resource to each terminal device.

In an embodiment of the present invention, the quality information determination module is specifically configured to, for each terminal device, determine whether the first theoretical transmission rate when transmitting data to the terminal device based on the codebook resources is smaller than the data transmission rate to the terminal device. Preset the minimum transmission rate; if yes, predict the second transmission quality information when transmitting data to the terminal device based on codebook resources according to the number of terminal devices; if no, determine the preset transmission quality information to be based on the codebook The second quality information when the resource transmits data to the terminal device.

In an embodiment of the present invention, the above codebook resource allocation module is specifically configured to, for each terminal device, according to the priority of each codebook resource allocated to the terminal device and the priority of each codebook resource when transmitting data to the terminal device In the second transmission quality information, the weight of each codebook resource allocated to the terminal device is determined; based on the determined weight, the codebook resource is allocated to each terminal device.

In an embodiment of the present invention, the above codebook resource allocation module is specifically configured to use the Hungarian algorithm to allocate codebook resources to each terminal device based on the determined priority and the second transmission quality information.

In this way, using the Hungarian algorithm to allocate codebook resources to each terminal device can improve the quality of service.

Corresponding to the resource allocation method of the SCMA system, an embodiment of the present invention further provides a base station.

Referring to FIG. 9, FIG. 9 is a schematic structural diagram of a base station according to an embodiment of the present invention, including a processor 901, a communication interface 902, a memory 903, and a communication bus 904, wherein the processor 901, the communication interface 902, and the memory 903 communicate through The bus 904 completes the communication with each other,

a memory 903 for storing computer programs;

The processor 901 is configured to implement the resource allocation method of the SCMA system provided by the embodiment of the present invention when executing the program stored in the memory 903 .

The communication bus mentioned in the above electronic device may be a peripheral component interconnect standard (Peripheral Component Interconnect, PCI) bus or an Extended Industry Standard Architecture (Extended Industry Standard Architecture, EISA) bus or the like. The communication bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

The communication interface is used for communication between the above electronic device and other devices.

The memory may include random access memory (Random Access Memory, RAM), and may also include non-volatile memory (Non-Volatile Memory, NVM), such as at least one disk memory. Optionally, the memory may also be at least one storage device located away from the aforementioned processor.

The above-mentioned processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; may also be a digital signal processor (Digital Signal Processing, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), Field-Programmable Gate Array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

In another embodiment provided by the present invention, a computer-readable storage medium is also provided, where a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the computer program provided by the embodiment of the present invention is implemented. A resource allocation method of SCMA system.

In another embodiment provided by the present invention, there is also provided a computer program product including instructions, which, when executed on a computer, enables the computer to implement a resource allocation method for an SCMA system provided by the embodiment of the present invention .

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center is by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that includes an integration of one or more available media. The usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, Solid State Disk (SSD)), among others.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

Each embodiment in this specification is described in a related manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the embodiments of the apparatus, the base station, and the computer-readable storage medium, since they are basically similar to the method embodiments, the description is relatively simple. The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (10)

1. a resource allocation method of SCMA system, is characterized in that, described method comprises: Send downlink reference signals to each terminal device based on the subcarrier resources, so that each terminal device predicts, according to the received downlink reference signal, first transmission quality information when transmitting data to each terminal device itself based on the subcarrier resources; Receive each first transmission quality information sent by each terminal device, and predict, according to the received first transmission quality information, a first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource, wherein the codebook The resources include at least one subcarrier resource; Determine the priority of allocating each codebook resource to each terminal device according to the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device; According to the predicted first theoretical transmission rate and the preset minimum transmission rate for transmitting data to each terminal device, determine the second transmission quality information when transmitting data to each terminal device based on each codebook resource; Codebook resources are allocated to each terminal device based on the determined priority and second transmission quality information, wherein the second transmission quality information is used to characterize the transmission quality when data is transmitted to each terminal device based on each codebook resource. 2. The method according to claim 1, wherein the first transmission quality information comprises: a signal-to-noise ratio of at least one subcarrier resource, The receiving each first transmission quality information sent by each terminal device, and predicting, according to the received first transmission quality information, the first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource, including: Receive the signal-to-noise ratio of each subcarrier resource sent by each terminal device; For each codebook resource, according to the received signal-to-noise ratio of each subcarrier resource included in the codebook resource, calculate the second theoretical transmission when data is transmitted to each terminal device based on each subcarrier resource included in the codebook resource For each terminal device, among the second theoretical transmission rates when transmitting data to the terminal device based on each subcarrier resource included in the codebook resource, a preset statistical analysis method is used to select a second theoretical transmission rate , as the first theoretical transmission rate when transmitting data to the terminal device based on the codebook resource. 3 . The method according to claim 2 , wherein, for each codebook resource, according to the received signal-to-noise ratio of each subcarrier resource included in the codebook resource, the calculation is based on the codebook resource including The second theoretical transmission rate of each subcarrier resource of , when transmitting data to each terminal device, including: Calculate the second theoretical transmission rate according to the following expression: r _u,l (n)=B*log(1+SNR _u,l ) Among them, u is the serial number of the terminal device, l is the serial number of the subcarrier resource, SNR _{u, l} is the signal-to-noise ratio of the lth subcarrier resource when transmitting data to the uth terminal device based on the lth subcarrier resource, and B is the subcarrier resource. Carrier frequency bandwidth, n is the sequence number of the transmission time interval, r _u,l (n) is the second theoretical transmission rate when data is transmitted to the uth terminal device based on the lth subcarrier resource in the nth transmission time interval. 4. The method according to claim 1, wherein the priority of allocating each codebook resource to each terminal device is determined according to the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device ,include: Calculate the ratio between the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device, determine the arrangement identifier of the calculated ratio according to the preset arrangement order, and use the determined identifier as the assignment of each codebook resource to The priority of each end device. 5 . The method according to claim 1 , wherein, according to the predicted first theoretical transmission rate and the preset minimum transmission rate for transmitting data to each terminal equipment, determining the transmission rate to each terminal equipment based on each codebook resource is determined. 6 . The second transmission quality information during data transmission, including: For each terminal device, determine whether the first theoretical transmission rate when transmitting data to the terminal device based on the codebook resource is less than the preset minimum transmission rate for transmitting data to the terminal device; If yes, according to the number of terminal devices, predict the second transmission quality information when data is transmitted to the terminal device based on the codebook resources; If no, the preset transmission quality information is determined as the second quality information when data is transmitted to the terminal device based on the codebook resource. 6. The method according to any one of claims 1-5, wherein the allocating codebook resources for each terminal device based on the determined priority and the second transmission quality information, comprising: For each terminal device, the weight of each codebook resource allocated to the terminal device is determined according to the priority of each codebook resource allocated to the terminal device and the second transmission quality information when each codebook resource transmits data to the terminal device ; Based on the determined weights, codebook resources are allocated to each terminal device. 7. The method according to any one of claims 1-5, wherein the allocating codebook resources for each terminal device based on the determined priority and the second transmission quality information, comprising: Based on the determined priority and the second transmission quality information, the Hungarian algorithm is used to allocate codebook resources to each terminal device. 8. A resource allocation device of an SCMA system, wherein the device comprises: A signal sending module, configured to send a downlink reference signal to each terminal device based on the subcarrier resources, so that each terminal device predicts, according to the received downlink reference signal, the first transmission quality information when data is transmitted to each terminal device itself based on the subcarrier resources ; a rate prediction module, configured to receive each first transmission quality information sent by each terminal device, and predict, according to the received first transmission quality information, a first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource, Wherein, the codebook resource includes at least one subcarrier resource; a priority determining module, configured to determine the priority of allocating each codebook resource to each terminal device according to the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device; a quality information determination module, configured to determine, according to the predicted first theoretical transmission rate and the preset minimum transmission rate for transmitting data to each terminal device, the second transmission quality information when transmitting data to each terminal device based on each codebook resource; A codebook resource allocation module, configured to allocate codebook resources to each terminal device based on the determined priority and the second transmission quality information, wherein the second transmission quality information is used to represent each terminal device based on each codebook resource Transmission quality when the device transmits data. 9. A base station, comprising a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; memory for storing computer programs; The processor is configured to implement the method steps of any one of claims 1-7 when executing the program stored in the memory. 10. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the method steps of any one of claims 1-7 are implemented.

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