CN111586867B

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

Info

Publication number: CN111586867B
Application number: CN202010349626.9A
Authority: CN
Inventors: 聂高峰; 田辉; 陈晨钜
Original assignee: Beijing University of Posts and Telecommunications
Current assignee: Beijing University of Posts and Telecommunications
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2022-04-22
Anticipated expiration: 2040-04-28
Also published as: CN111586867A

Abstract

The embodiment of the invention provides a resource allocation method and a device of an SCMA system, wherein the method comprises the following steps: sending downlink reference signals to each terminal device based on subcarrier resources, receiving each first transmission quality information sent by each terminal device, and predicting theoretical transmission rate when data are transmitted to each terminal device based on each codebook resource; determining the priority for allocating codebook resources to the terminal equipment according to the theoretical transmission rate and the historical average transmission rate of each terminal equipment; determining second transmission quality information when data are transmitted to each terminal device based on each codebook resource; and allocating codebook resources for each terminal device based on the priority and the second transmission quality information. When the scheme provided by the embodiment is applied to the allocation of the resources of the SCMA system, the efficiency of allocating the codebook resources to the terminal equipment can be improved, and the quality of the service provided for the terminal equipment is further improved.

Description

Resource allocation method and device of SCMA (sparse code multiple access) system

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a resource allocation method and apparatus for an SCMA system.

Background

More and more user terminal devices need to be accessed to a base station to realize communication, and a Sparse Code Multiple Access (SCMA) is used as a non-orthogonal multiple Access technology to enable a large amount of terminal devices to be accessed to the base station. In an SCMA system based on the SCMA technique, when a base station provides a communication service to each terminal device, data is transmitted to each terminal device based on each codebook resource, thereby providing the communication service to a user. 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 a base station allocates codebook resources to each terminal device, the codebook resources are allocated based on transmission quality when each codebook resource transmits data to each terminal device. For example: the codebook resource S may be determined as the codebook resource for data transmission to terminal device UE1, assuming that the transmission quality of data transmission to terminal device UE1 is better than the transmission quality of data transmission to terminal device UE2 based on codebook resource S.

However, since the base station allocates the codebook resources based on the transmission quality when transmitting data to each terminal device per codebook resource, if the transmission quality when transmitting data to a terminal device is always poor, it is difficult for the terminal device to allocate the codebook resources. In particular, when the number of terminal devices is much larger than the codebook resources, the terminal devices may not be allocated with the codebook resources for a long time, and thus it is difficult to obtain communication services, which may result in inefficient allocation of codebook resources by the base station to some terminal devices, and further, may also reduce the quality of services provided by the base station to these terminal devices.

Disclosure of Invention

An object of the embodiments of the present invention is to provide a method and an apparatus for allocating resources of an SCMA system, so as to improve efficiency of allocating codebook resources to a terminal device, thereby improving quality of service provided to the terminal device. The specific technical scheme is as follows:

in a first aspect, an embodiment of the present invention provides a resource allocation method for an SCMA system, where the method includes:

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

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

determining the priority for distributing 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;

determining second transmission quality information when data are transmitted to each terminal device based on each codebook resource according to the predicted first theoretical transmission rate and a preset minimum transmission rate of the data transmitted to each terminal device;

and allocating codebook resources for each terminal device based on the determined priority and the second transmission quality information.

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

the receiving each first transmission quality information sent by each terminal device, and predicting a first theoretical transmission rate when transmitting data to each terminal device based on each codebook resource according to the received first transmission quality information, includes:

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

and for each codebook resource, calculating a second theoretical transmission rate when the data is transmitted to each terminal device based on each subcarrier resource included by the codebook resource according to the received signal-to-noise ratio of each subcarrier resource included by the codebook resource, and for each terminal device, selecting a minimum second theoretical transmission rate in a preset statistical analysis mode from the second theoretical transmission rates when the data is transmitted to the terminal device based on each subcarrier resource included by the codebook resource as a first theoretical transmission rate when the data is transmitted to the terminal device based on the codebook resource.

In an embodiment of the present invention, the calculating, for each codebook resource, a second theoretical transmission rate when transmitting data to each terminal device based on each subcarrier resource included in the codebook resource according to the received signal-to-noise ratio of each subcarrier resource included in the codebook resource includes:

the second theoretical transmission rate is calculated according to the following expression:

r_u,l(n)＝B*log(1+SNR_u,l)

wherein u is the serial number of the terminal device, l is the serial number of the subcarrier resource, SNR_u,lA signal-to-noise ratio of the l sub-carrier resource when transmitting data to the u terminal device based on the l sub-carrier resource, B is a sub-carrier frequency bandwidth, and n is a sequence of transmission time intervalsNumber r_u,lAnd (n) is a second theoretical transmission rate when data is transmitted to the u terminal equipment based on the l subcarrier resource in the nth transmission time interval.

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

and calculating the ratio between the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device, determining the arrangement identifier of the calculated ratio according to a preset arrangement sequence, and taking the determined identifier as the priority for distributing each codebook resource to each terminal device.

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

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

if so, predicting second transmission quality information when transmitting data to the terminal equipment based on codebook resources according to the number of the terminal equipment;

if not, determining the preset transmission quality information as second quality information when the data is transmitted to the terminal equipment based on the codebook resources.

In an embodiment of the present invention, the allocating codebook resources for each terminal device based on the determined priority and the second transmission quality information includes:

for each terminal device, determining the weight allocated to the terminal device by each codebook resource according to the priority allocated to the terminal device by each codebook resource 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 for the respective terminal devices.

and allocating codebook resources to each terminal device by adopting a Hungarian algorithm based on the determined priority and the second transmission quality information.

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

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, 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 piece of 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, where the codebook resource includes at least one subcarrier resource;

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

the quality information determining module is used for determining second transmission quality information when data are transmitted to each terminal device based on each codebook resource according to the predicted first theoretical transmission rate and a preset minimum transmission rate of the data transmitted to each terminal device;

and the codebook resource allocation module is used for allocating codebook resources for each terminal device based on the determined priority and the second transmission quality information.

the rate prediction module comprises:

the signal-to-noise ratio receiving submodule is used for receiving the signal-to-noise ratio of each subcarrier resource sent by each terminal device;

and the rate prediction sub-module is used for calculating a second theoretical transmission rate when the data is transmitted to each terminal device based on each subcarrier resource included by the codebook resource according to the received signal-to-noise ratio of each subcarrier resource included by the codebook resource aiming at each codebook resource, and selecting a second theoretical transmission rate as a first theoretical transmission rate when the data is transmitted to the terminal device based on the codebook resource by adopting a preset statistical analysis mode in the second theoretical transmission rates when the data is transmitted to the terminal device based on each subcarrier resource included by the codebook resource aiming at each terminal device.

In an embodiment of the present invention, the 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)

wherein u is the serial number of the terminal device, l is the serial number of the subcarrier resource, SNR_u,lA signal-to-noise ratio of the first sub-carrier resource when transmitting data to the u terminal device based on the first sub-carrier resource, B is a sub-carrier frequency bandwidth, n is a serial number of a transmission time interval, r_u,lAnd (n) is a second theoretical transmission rate when data is transmitted to the u terminal equipment based on the l subcarrier resource in the nth transmission time interval.

In an embodiment of the present invention, the priority determining module is specifically configured to calculate a ratio between the predicted first theoretical transmission rate and a historical average transmission rate of each terminal device, determine an arrangement identifier of the calculated ratio according to a preset arrangement order, and use the determined identifier as a priority for allocating each codebook resource to each terminal device.

In an embodiment of the present invention, the quality information determining module is specifically configured to determine, for each terminal device, whether a first theoretical transmission rate when transmitting data to the terminal device based on codebook resources is less than a preset minimum transmission rate for transmitting data to the terminal device; if so, predicting second transmission quality information when transmitting data to the terminal equipment based on codebook resources according to the number of the terminal equipment; if not, determining the preset transmission quality information as second quality information when the data is transmitted to the terminal equipment based on the codebook resources.

In an embodiment of the present invention, the codebook resource allocation module is specifically configured to determine, for each terminal device, a weight allocated to the terminal device by each codebook resource according to a priority allocated to the terminal device by each codebook resource and second transmission quality information when each codebook resource transmits data to the terminal device; based on the determined weights, codebook resources are allocated for the respective terminal devices.

In an embodiment of the present invention, the codebook resource allocation module is specifically configured to allocate codebook resources to each terminal device by using a hungarian algorithm 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, where the processor and the communication interface complete communication between the memory and the processor through the communication bus;

a memory for storing a computer program;

a processor configured to implement the method steps of the first aspect when executing the program stored in the memory.

In a fourth aspect, the present invention provides a computer-readable storage medium, in which a computer program is stored, and the computer program, when executed by a processor, implements the method steps described in the first aspect.

As can be seen from the above, when the scheme provided by the embodiment of the present invention is applied to allocate resources of the SCMA system, since codebook resources are allocated to each terminal device according to the determined priority and the second transmission quality information, and the priority 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 since the first theoretical transmission rate can be used to represent the transmission rate when data is transmitted to each terminal device by each codebook resource, and the historical average transmission rate of each terminal device can be used to represent the resource situation of each terminal device in historical allocation, when codebook resources are allocated to each terminal device according to the determined priority, on the basis that each terminal device can be allocated to codebook resources as much as possible, the transmission rate at which data is transmitted to the terminal device based on the allocated codebook resources can be increased. Therefore, compared with the prior art, the method and the device improve the efficiency of the base station for allocating the codebook resources to the terminal equipment, and further improve 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, the service quality of providing the service requested by the terminal device to the terminal device based on the allocated codebook resources can be higher. Therefore, the efficiency of allocating the codebook resources to the terminal equipment by the base station is improved, the service quality of providing the terminal equipment service to the terminal equipment based on the allocated codebook resources is higher, and the service quality of providing communication service for each terminal equipment is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

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

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

FIG. 3 is a flowchart illustrating a resource allocation method of a second SCMA system according to an embodiment of the present invention;

fig. 4 is a diagram illustrating an efficient channel occupation ratio according to an embodiment of the present invention;

FIG. 5 is a comparison of system throughput provided by embodiments of the present invention;

fig. 6 is a comparative diagram of fairness in allocating codebook resources according to an embodiment of the present invention;

fig. 7 is a comparison diagram of the number of effective users according to an embodiment of the present invention;

fig. 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 Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic flowchart of a resource allocation method of a first SCMA system according to an embodiment of the present invention, where the method includes S101 to S105.

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

The subcarrier resources described above can be understood as: resources for transmitting signals.

The terminal device can be a mobile phone, a tablet computer, a computer and the like used by a user.

The downlink reference signal is: the base station sends a signal to the terminal device for estimating the transmission quality when transmitting data.

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

Because the difference of the transmission quality of the downlink reference signals transmitted based on the closely spaced subcarrier resources is small, when the downlink reference signals are transmitted to each terminal device based on the subcarrier resources, the downlink reference signals can be transmitted to each terminal device based on the subcarrier resources with the large spacing between the subcarrier resources.

The 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 first transmission information may include: signal to noise ratio of at least one subcarrier resource.

When the terminal device predicts the first transmission quality information when transmitting data to each terminal device itself based on the subcarrier resources according to the received downlink reference signal, the first transmission quality information may be predicted according to any one of the methods in the prior art.

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

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

The codebook resource includes at least one subcarrier resource. Specifically, codebook resources may be determined based on subcarrier resources within the SCMA system. For example: the n consecutive sub-carrier resources may be grouped into one group, and the sub-carrier resources of each group after grouping may be generated by using the SCMA encoding technique

A plurality of codebook resources, wherein,

is the number of codebook resources, n is the number of subcarrier resources, d_vThe number of subcarriers included for each codebook resource.

The first theoretical transmission rate when transmitting data to each terminal device based on each codebook resource may be understood as: a transmission rate at which the base station transmits the service data to each terminal device based on each codebook resource.

Since the 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 can predict the first theoretical transmission rate when transmitting data to each terminal device based on each codebook resource according to the received first transmission quality information.

Specifically, when the 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, a shannon formula may be used to calculate a first theoretical transmission rate when transmitting data to each terminal device based on each codebook resource.

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 may be constructed according to each predicted first theoretical transmission rate, and since the first theoretical transmission rate represents the transmission rate when transmitting data to each terminal device based on each codebook resource, the matrix may also be referred to as a user-codebook rate matrix.

S103: and determining the priority for distributing 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 the codebook resources is performed at each TTI (Transmission Time Interval) Time, assuming that the current Time of resource allocation is n times, the historical average Transmission rate when data is transmitted to each terminal device based on each codebook resource may be understood as: the base station transmits an average value of real-time transmission rates at the time of transmitting data to the respective terminal apparatuses based on the allocated codebook resources during the period from the TT 11 time to the TTI (n-1) time. The TTI 1 time point mentioned above represents a time point at which the codebook resource is allocated for the first time, and the TTI (n-1) time point represents a time point at which the codebook resource is allocated for the (n-1) th time, that is, a previous time point at which the codebook resource is currently allocated.

Specifically, the historical average transmission rate T of each terminal device can be calculated according to the following formula_u(n)。

When n is 1, T_u(n)＝r_u(n)。

When N is 2,3, … …, N,

wherein 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 terminal device at the nth transmission time interval, T_u(n-1) is the historical average transmission rate of the u terminal device at the n-1 transmission time interval, r_u(n) is the actual transmission rate of the u terminal device at the n transmission time interval, r_uAnd (n-1) is the actual transmission rate of the u terminal equipment at the n-1 transmission time interval.

The priority of each codebook resource allocated to each terminal device is used for determining the sequence of each codebook resource allocated to each terminal device. When the priority of the code book resource to be allocated to one terminal device is higher than that of another terminal device, it indicates that the code book resource is preferentially allocated to the former terminal device.

Since the first theoretical transmission rate may be used to represent a transmission rate when each codebook resource transmits data to each terminal device, and the historical average transmission rate of each terminal device may be used to represent a resource condition historically allocated to each terminal device, in order to increase the data transmission rate and enable each terminal device to be allocated to the codebook resource as much as possible, the priority for allocating each codebook resource to each terminal device may be determined according to the predicted first theoretical transmission rate and the historical average transmission rate of each terminal device. For example: the priority for allocating each codebook resource to each terminal device may be determined based on a weight of the first theoretical transmission rate and a weight of a historical average transmission rate of each terminal device.

After determining the priority for allocating each codebook resource to each terminal device, a priority matrix may be constructed according to the priority for allocating each codebook resource 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 priority indicates a priority of allocating each codebook resource to each terminal device, the matrix may also be referred to as a user-codebook priority matrix.

S104: and determining second transmission quality information when the data is transmitted to each terminal device based on each codebook resource according to the predicted first theoretical transmission rate and a preset minimum transmission rate for transmitting the data to each terminal device.

The preset minimum transmission rate for transmitting data to each terminal device may be: GBR (guaranteed Bit Rate) of each terminal device.

The second transmission quality information when transmitting data to each terminal device based on each codebook resource is used for representing the transmission quality when transmitting data to each terminal device based on each codebook resource.

The second transmission quality information can be represented by a quality score, and when the transmission quality of the codebook resource for transmitting data to the terminal equipment is poor, the quality score is low; the quality score is higher when the transmission quality of the codebook resource for transmitting data to the terminal device is better.

Specifically, when a first theoretical transmission rate when transmitting data to the terminal device based on the codebook resources is lower than a preset minimum transmission rate for transmitting data to the terminal device, it indicates that an expected transmission requirement cannot be met based on the codebook resources.

When a first theoretical transmission rate when transmitting data to a terminal device based on codebook resources is higher than a preset minimum transmission rate for transmitting data to the terminal device, it indicates that the service quality of providing the service requested by the terminal device to the terminal device based on the codebook resources is higher.

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 the respective terminal devices based on the respective codebook resources, a second transmission quality information matrix may be constructed from the determined second transmission quality information. Since the second transmission quality information described above can be characterized by a quality score, a user-codebook quality score matrix can be constructed.

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

Based on the above analysis, when allocating codebook resources to each terminal device based on the determined priority, on the basis of allowing each terminal device to be allocated codebook resources as much as possible, the transmission rate when transmitting data to the terminal device based on the allocated codebook resources can be increased. And the second transmission quality information is used for representing the transmission quality when data are transmitted to each terminal device based on each codebook resource, and when the codebook resources are allocated to each terminal device based on the second transmission quality information, the service quality of the service requested by the terminal device provided to the terminal device based on the allocated codebook resources can be higher. 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 codebook resources as much as possible, the transmission rate when transmitting data to the terminal device based on the allocated codebook resources can be increased, and the service quality of providing the terminal device service to the terminal device based on the allocated codebook resources is higher.

In an embodiment of the present invention, the allocating codebook resources for each terminal device based on the determined priority and the second transmission quality information in S105 can be implemented as follows.

For each terminal device, determining the weight allocated to the terminal device by each codebook resource according to the priority allocated to the terminal device by each codebook resource 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 for the respective terminal devices.

When determining the weight of each codebook resource allocated to each terminal device, the sum of the priority of each codebook resource allocated to the terminal device and the second transmission quality information of each codebook resource transmitting data to the terminal device may be calculated for each terminal device, and the average value between the priority of each codebook resource allocated to the terminal device and the second transmission quality information of each codebook resource transmitting data to the terminal device may also be calculated.

In an embodiment of the present invention, a weight matrix may be further constructed according to the determined weights allocated to the terminal devices by the codebook resources. The weight matrix may also be referred to as a user-codebook weight matrix.

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

For example: assuming that there are three codebook resources and three terminal devices, the range of priorities for allocating the codebook resources to the terminal devices is [1,10], and 1 indicates the highest priority order and 10 indicates the lowest priority order. And the second transmission quality information of the data transmitted to the terminal equipment by the codebook resource is 1 or 100, wherein 1 represents that the second transmission quality information is better, and 100 represents that the second transmission quality information is worse.

Wherein, the priority of the first codebook resource allocated to each terminal device is [1,2,3] and the transmission quality is [100,1,100], the priority of the second codebook resource allocated to each terminal device is [3,1,2] and 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 priority and the second transmission quality information, the weight matrix can be determined as follows:

in the weight matrix, a row represents each codebook resource, a column represents each terminal device, and each element value represents a weight for allocating the codebook resource corresponding to the row of the element to the terminal device corresponding to the column of the element.

When codebook resources are allocated to the respective terminal devices based on the determined weights. The method can determine a plurality of resource allocation schemes for allocating each codebook resource to each terminal device, determine the scheme weight sum of each resource allocation scheme, and use the resource allocation scheme with the minimum weight sum as the final resource allocation scheme, thereby allocating the codebook resource to each terminal device.

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

One 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 allocating the codebook resources corresponding to the third row to the terminal equipment corresponding to the third column. The sum of the weights of the resource allocation schemes can be calculated according to the matrix as follows: 101+2+4 is 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 allocating the codebook resources corresponding to the third row to the terminal equipment corresponding to the second column. The sum of the weights of the resource allocation schemes can be calculated according to the matrix as follows: 101+102+3 is 206.

According to the method, the weight sum of various resource allocation schemes can be calculated according to the matrix, and the resource allocation scheme with the minimum weight sum is selected as the final resource allocation scheme, so that resources are allocated to each terminal device according to the final resource allocation scheme.

As can be seen from the above, when the scheme provided by this embodiment is applied to allocate resources of the SCMA system, since codebook resources are allocated to each terminal device according to the determined priority and the second transmission quality information, the priority 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 since the first theoretical transmission rate can be used to represent the transmission rate when data is transmitted to each terminal device by each codebook resource, and the historical average transmission rate of each terminal device can be used to represent the resource condition historically allocated to each terminal device, when codebook resources are allocated to each terminal device according to the determined priority, each terminal device can be allocated to codebook resources as much as possible, the transmission rate at which data is transmitted to the terminal device based on the allocated codebook resources can be increased. Therefore, compared with the prior art, the method and the device improve the efficiency of the base station for allocating the codebook resources to the terminal equipment, and further improve 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, the service quality of the service requested by the terminal device to be provided to the terminal device based on the allocated codebook resources can be made higher. Therefore, the efficiency of allocating the codebook resources to the terminal equipment by the base station is improved, the service quality of providing the terminal equipment service to the terminal equipment based on the allocated codebook resources is higher, and the service quality of providing communication service for each terminal equipment is further improved.

In an embodiment of the present invention, when the codebook resource includes at least one subcarrier resource and the first transmission quality information includes a signal-to-noise ratio of the at least one subcarrier resource, the receiving of each piece of first transmission quality information sent by each terminal device in S102 may be implemented according to the following steps a1 to A3, and the first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource may be predicted according to the received first transmission quality information.

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

Since the codebook resources may 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 may predict, according to the received downlink reference signal, a signal-to-noise ratio of each subcarrier resource when transmitting data to itself based on each subcarrier resource, and each terminal device sends the predicted signal-to-noise ratio of each subcarrier resource to the base station.

Step A2: and for each codebook resource, calculating a second theoretical transmission rate when the data is transmitted to each terminal device based on each subcarrier resource included by the codebook resource according to the received signal-to-noise ratio of each subcarrier resource included by the codebook resource, and for each terminal device, selecting a second theoretical transmission rate in a preset statistical analysis mode from the second theoretical transmission rates when the data is transmitted to the terminal device based on each subcarrier resource included by the codebook resource as a first theoretical transmission rate when the 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, a shannon formula may be used to calculate a second theoretical transmission rate when transmitting data to each terminal device based on each subcarrier resource included in the codebook resource.

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

r_u,l(n)＝B*log(1+SNR_u,l)

Thus, for each codebook resource, the second theoretical transmission rate when transmitting data to each terminal device based on each subcarrier resource included in the codebook resource can be more accurately calculated by adopting the formula.

Specifically, the preset statistical analysis method may be: taking the minimum value, taking the average value or taking the median value, etc.

Taking the above-mentioned preset statistical analysis manner as an example to take the minimum value, assuming that the SCMA system includes the terminal Ue1, the two codebook resources are: s1, S2, wherein S1 includes subcarrier resources S11, S12, and S2 includes subcarrier resources S21, S22.

A 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 in the above Table 1_Ue1，S11Denotes a second theoretical transmission rate, R, when data is transmitted to the terminal device Ue1 based on the subcarrier resource S11_Ue2，S11Denotes a second theoretical transmission rate when transmitting data to the terminal device Ue2 based on the subcarrier resource S12, and similarly, R_Ue1，S12、R_Ue1，S21、R_Ue1，S22、R_Ue2，S12、R_Ue2，S21、R_Ue2，S22Indicating a second theoretical transmission rate at which data is transmitted to the terminal device based on the respective subcarrier resources.

Based on table 1 above, it can be determined that the first theoretical transmission rate when data is transmitted to each terminal device based on each codebook resource is as 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)

Wherein Min (R) in Table 2_Ue1，S11,R_Ue1，S12) Denotes a first theoretical transmission rate when transmitting data to the terminal device Ue1 based on codebook resources S1, since R_Ue1，S11Denotes a second theoretical transmission rate, R, when data is transmitted to the terminal device Ue1 based on the subcarrier resource S11_Ue1，S12Representing a second theoretical transmission rate for data transmission to terminal device Ue1 based on subcarrier resources S12, and codebook resource S1 includes subcarrier resources S11, S12, and therefore R is assigned_Ue1，S11And R_Ue1，S12The minimum value of (d) is taken as the first theoretical transmission rate when transmitting data to the terminal device Ue1 based on the codebook resources S1. Similarly, Min (R)_Ue2，S11,R_Ue2，S12)、Min(R_Ue1，S21,R_Ue1，S22)、Min(R_Ue2，S21,R_Ue2，S22) Is a first theoretical transmission rate at which data is transmitted to the respective terminal device based on the respective codebook resources.

In this way, since the codebook resource includes at least one subcarrier resource, and the second theoretical transmission rate for transmitting data to each terminal device based on each subcarrier resource included in the codebook resource is different for each codebook resource, for each terminal device, a preset statistical analysis manner is adopted to select one second theoretical transmission rate as the first theoretical transmission rate for transmitting data to the terminal device based on the codebook resource in the second theoretical transmission rates for transmitting data to each terminal device based on each subcarrier resource included in the codebook resource, so that the first theoretical transmission rate for transmitting data to each terminal device based on each codebook resource can be determined more accurately.

In an embodiment of the present invention, determining the priority for allocating each codebook resource to each terminal device according to the predicted first theoretical transmission rate and the codebook resource already allocated to each terminal device in S103 may be implemented as follows.

In this way, the predicted ratio between the first theoretical transmission rate and the historical average transmission rate of each terminal device is used for determining the permutation identification of the calculated ratio according to the preset permutation sequence, the determined identification is used as the priority for allocating each codebook resource to each terminal device, and 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 far as possible, the transmission rate when data are transmitted to the terminal device based on the allocated codebook resource can be improved

In an embodiment of the present invention, the determining of 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 in S104 may be implemented as follows.

For each terminal device, judging whether a first theoretical transmission rate when transmitting data to the terminal device based on codebook resources is less than a preset minimum transmission rate for transmitting data to the terminal device; if so, predicting second transmission quality information when transmitting data to the terminal equipment based on codebook resources according to the number of the terminal equipment; if not, determining the preset transmission quality information as second quality information when the data is transmitted to the terminal equipment based on the codebook resources.

Specifically, it is assumed that the second transmission quality information is represented by a quality score, and the higher the quality score is, the worse the transmission quality when the codebook resource transmits data to the terminal device is, and the lower the quality score is, the better the transmission quality when the codebook resource transmits data to the terminal device is, so that when the predicted first theoretical transmission rate is less than the preset minimum transmission rate for transmitting data to each terminal device, the square or the third power of the number of the terminal devices may be calculated, and the calculated value may be 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 a preset minimum transmission rate at which data is transmitted to the respective terminal devices, "1" may be determined as the second transmission quality information at the time of transmitting data to the terminal devices based on the 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, second transmission quality information when data are transmitted to each terminal device based on each codebook resource is determined, and when codebook resources are allocated to each terminal device based on the second transmission quality information, the transmission success rate when data are transmitted to the terminal device based on the allocated codebook resources can be made higher.

On the basis of the foregoing embodiment, 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 S105 may also be implemented as follows.

Specifically, when the Hungarian algorithm is adopted to allocate codebook resources to each terminal device, the following steps can be adopted.

The first step is as follows: judging the relation between the number U of the terminal equipment and the number M of codebook resources in an SCMA system, and supplementing a user-codebook weight matrix into an M-M matrix by supplementing 0 when U is less than M; and when the U is larger than or equal to M, supplementing the user-codebook weight matrix into a matrix of U by supplementing 0. The user-codebook weight matrix may be determined based on a user-codebook priority matrix and a user-codebook quality score matrix. For example: the sum of the user-codebook priority matrix and the user-codebook quality score matrix may be used as the user-codebook weight matrix.

Each step is to operate the user-codebook weight matrix after 0 is complemented.

The second step is that: for each row of elements, subtracting the minimum value in the row of elements; and for each column element, subtracting the minimum value in that column element.

The third step: and traversing each row of elements, when only one independent 0 element exists in a certain row of elements, determining the independent 0 element as an independent 0 element, and marking other 0 elements in the row and the column where the 0 element is located as the unselected 0 elements. The independent 0 elements are: 0 elements in the same column and in the same row as the selected independent 0 elements in the matrix. According to the same operation, each column of elements is traversed, and independent 0 elements and non-selectable elements in each column are determined.

When no new independent 0 element is marked according to the method of the third step, the fourth step is performed.

The fourth step: the remaining optional 0 elements are marked with an x number as 0 x elements.

The fifth step: and traversing each row of elements, determining the optional 0-element with the minimum column number in each row as an independent 0 element, marking other 0-elements in the row and the column where the element is positioned as the unselected elements, obtaining a pre-selection matrix, and marking all 0-elements as optional elements.

And a sixth step: traversing each row element in the pre-selection matrix, determining an optional 0 element in the row for the row without the independent 0 element, recording a first position of the element in the pre-selection matrix, then determining the independent 0 element in a column in the first position, recording a second position of the element in the pre-selection matrix, and then performing a recursive operation in the row in the second position.

When the end condition of the recursive operation is to find 0 elements, assume that the position of the last independent 0 element in the pre-selected matrix is the third position. If a row in the third position is the first row, the row is exited for operation and the next row in the matrix is operated upon. If the row in the third position is not the first row, deleting the third position and a row position above the third position in the recorded pre-selection matrix, and then marking 0-element at the row position above the third position as an unselected element.

When the end condition of the recursion operation is to find the independent 0 element, the interchange operation is performed according to all the recorded 0 elements, that is, the 0 element is determined as the independent 0 element, and the independent 0 element is determined as the 0 element.

The number of independent 0 elements is found to be the maximum from the above-mentioned third step to the above-mentioned sixth step.

The seventh step: for the matrix obtained in the sixth step, each row element is traversed, when a certain row has no independent 0 element, the row is marked as 1, and then whether other 0 elements exist on the column is checked. If so, marking the column as 1, performing the above operation on the row element where each 0 element is located, and if not, ending the operation. And continuously traversing each row element of the matrix, unmarking the row element marked as 1, and marking the row element not marked as 1.

Eighth step: searching all the rows and columns in the matrix for the elements which are not marked as 1, recording the minimum element value, and carrying out the next step if all the rows and columns do not have the elements which are not marked as 1; if so, all element values on the row not marked 1 are subtracted by the recorded minimum element value, all element values on the row marked 1 are added by the recorded minimum element value, and the third step above is started.

And ninthly, initializing a distribution matrix Alloc _ scheme with the same size as the pre-selected matrix, and assigning a value of 1 at the same position of the Alloc _ scheme according to the position of each independent 0 element.

Wherein, the position (u, m) of the element with the matrix element of 1, u is the serial number of the codebook resource, m is the serial number of the terminal device, and (u, m) indicates that the mth codebook resource is allocated to the uth terminal device. Meanwhile, only one 1 exists in each row and each column in the matrix, which represents that the terminal equipment and the codebook resources are in one-to-one correspondence.

When U is larger than M, the supplementary U-M columns in the distribution matrix Alloc _ scheme are deleted and reduced to U M.

And when U is less than M, reallocating the residual resources allocated to the M-U virtual terminal devices to the terminal devices which do not reach the GBR requirement according to the actual transmission rate of the U terminal devices.

Specifically, a new GBR requirement may be reset for a terminal device that does not meet the predetermined GBR requirement, and when the new GBR requirement is reset for the terminal device, a difference between the predetermined GBR requirement and the first theoretical transmission rate corresponding to the terminal device may be used as the new GBR requirement for the terminal device. And after the new GBR requirement is determined for the terminal equipment again, traversing the processes from the first step to the ninth step to realize the reallocation of the residual resources.

Based on the matrix Alloc _ scheme obtained in the ninth step, codebook resources may be allocated to each terminal device.

Referring to fig. 2, fig. 2 is a signaling interaction diagram of a codebook resource allocation method of an SCMA system according to an embodiment of the present invention. The method includes S201-S206.

Fig. 2 includes a base station and a UE (User Equipment), which may also be referred to as a terminal device.

S201: and the base station sends downlink reference signals to the UE based on the subcarrier resources.

S202: and 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 signal-to-noise ratio to the base station.

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

S205: allocating codebook resources for the UE based on the determined priority and the transmission quality information.

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

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

S301: a user-codebook rate matrix is obtained.

The user-codebook rate matrix is: a matrix constructed from the respective first theoretical transmission rates predicted in S102 described above.

S302: a user-codebook priority matrix is obtained.

The user-codebook priority matrix is; a matrix constructed according to the priorities of allocating the respective codebook resources to the respective terminal devices determined in the above S103.

S303: a user-codebook quality matrix is obtained.

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

S304: a user-codebook weight matrix is obtained.

The user-codebook weight matrix is: and (4) performing matrix addition operation on the user-codebook priority matrix obtained in the step (302) and the user-codebook quality matrix obtained in the step (303) to obtain a matrix.

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

The following is an experimental simulation result when the scheme provided by the embodiment of the invention and other schemes are adopted to allocate resources of the SCMA system.

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

The path loss model uses a logarithmic distance loss model, and the loss at a reference distance of 1m is obtained by the fries Friis transmission formula.

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

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

As can be seen from fig. 4, an increase in GBR requirements results in a decrease in the effective channel fraction.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating comparison of system throughput according to an embodiment of the present invention. The abscissa is the number of users, and the ordinate is the throughput rate in Mbps. Fig. 5 compares the scheme proposed in the embodiment of the present invention with the SCMA-PF scheme in the case of GBR of 256Kbps and GBR of 316Kbps, and obtains the system throughput of each scheme under different GBR requirements.

As can be seen from fig. 5, as the number of users increases, the system throughput of the scheme proposed by the embodiment of the present invention increases under different GBR requirements.

Referring to fig. 6, fig. 6 is a schematic diagram illustrating a comparison of fairness in allocating resources according to an embodiment of the present invention. The abscissa is the number of users, and the ordinate is the fairness index of the allocated codebook resources. Fig. 6 is a comparison between the scheme proposed in the embodiment of the present invention and the SCMA-PF scheme in the case that GBR is 256Kbps and GBR is 316Kbps, so as to obtain the fairness of the allocated resources of the schemes under different GBR requirements.

As can be seen from fig. 6, when GBR is 256Kbps, the fairness of the scheme proposed by the embodiment of the present invention is reduced a little; when the GBR is 316Kbps, the fairness of the scheme proposed by the embodiment of the present invention decreases more as the number of users increases, but eventually stabilizes above 0.9.

Referring to fig. 7, fig. 7 is a schematic diagram illustrating a comparison of the number of valid users according to an embodiment of the present invention. The abscissa is the number of users and the ordinate is the number of valid users.

The effective users are: and after the allocation of the codebook resources is finished every time, the actual transmission rate is not less than the GBR terminal equipment when the codebook resources are transmitted to the terminal equipment.

Fig. 7 is a diagram comparing the scheme proposed in the embodiment of the present invention with the SCMA-PF scheme in the case where the GBR is 256Kbps and the GBR is 316Kbps, to obtain the number of active users for different GBR requirements for each scheme.

As can be seen from fig. 7, when the GBR is 256Kbps, the number of effective users in the scheme proposed by the embodiment of the present invention can reach the maximum number of serviceable users, and when the GBR is 316Kbps, the number of effective users can be gradually increased to the maximum number of serviceable users along with the increase of the number of users.

Corresponding to the codebook resource allocation method in the SCMA system, the embodiment of the invention also provides a codebook resource allocation device 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 and 805.

A signal sending module 801, configured to send a downlink reference signal to each terminal device based on a subcarrier resource, 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 resource;

a rate prediction module 802, configured to receive each piece of 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, where the codebook resource includes at least one subcarrier resource;

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

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

a codebook resource allocating module 805, configured to allocate codebook resources for each terminal device based on the determined priority and the second transmission quality information.

the rate prediction module 802 includes:

r_u,l(n)＝B*log(1+SNR_u,l)

Thus, the Hungarian algorithm is adopted to allocate codebook resources to each terminal device, and the service quality can be improved.

Corresponding to the resource allocation method of the SCMA system, the embodiment of the invention also 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, where the processor 901, the communication interface 902, and the memory 903 complete mutual communication through the communication bus 904,

a memory 903 for storing computer programs;

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

The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.

The communication interface is used for communication between the electronic equipment and other equipment.

The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.

The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) 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 further provided, in which a computer program is stored, and the computer program, when executed by a processor, implements a resource allocation method of an SCMA system provided by an embodiment of the present invention.

In yet another embodiment, a computer program product containing instructions is provided, which when executed on a computer causes the computer to implement a resource allocation method of an SCMA system provided by an embodiment of the present invention.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may 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 loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., 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, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the embodiments of the apparatus, the base station, and the computer-readable storage medium, since they are substantially similar to the embodiments of the method, the description is simple, and in relation to the above, reference may be made to the partial description of the embodiments of the method. The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for resource allocation in an SCMA system, the method comprising:

and allocating codebook resources to each terminal device based on the determined priority and second transmission quality information, wherein the second transmission quality information is used for representing the transmission quality when data are transmitted to each terminal device based on each codebook resource.

2. The method of claim 1, wherein the first transmission quality information comprises: the signal-to-noise ratio of at least one sub-carrier resource,

and for each codebook resource, calculating a second theoretical transmission rate when the data is transmitted to each terminal device based on each subcarrier resource included by the codebook resource according to the received signal-to-noise ratio of each subcarrier resource included by the codebook resource, and for each terminal device, selecting a second theoretical transmission rate in a preset statistical analysis mode from the second theoretical transmission rates when the data is transmitted to the terminal device based on each subcarrier resource included by the codebook resource as a first theoretical transmission rate when the data is transmitted to the terminal device based on the codebook resource.

3. The method according to claim 2, wherein said calculating, for each codebook resource, a second theoretical transmission rate for transmitting data to each terminal device based on each subcarrier resource included in the codebook resource according to the received signal-to-noise ratio of each subcarrier resource included in the codebook resource comprises:

r_u，l(n)＝B*log(1+SNR_u，l)

wherein u is the serial number of the terminal device, l is the serial number of the subcarrier resource, SNR_u，lA signal-to-noise ratio of the first sub-carrier resource when transmitting data to the u terminal device based on the first sub-carrier resource, B is a sub-carrier frequency bandwidth, n is a serial number of a transmission time interval, r_u，lAnd (n) is a second theoretical transmission rate when data is transmitted to the u terminal equipment based on the l subcarrier resource in the nth transmission time interval.

4. The method of claim 1, wherein determining the priority for 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 comprises:

5. The method of claim 1, wherein the determining 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 a preset minimum transmission rate for transmitting data to each terminal device comprises:

6. The method according to any of claims 1-5, wherein the allocating codebook resources for each terminal device based on the determined priority and second transmission quality information comprises:

7. The method according to any of claims 1-5, wherein the allocating codebook resources for each terminal device based on the determined priority and second transmission quality information comprises:

8. An apparatus for resource allocation in an SCMA system, the apparatus comprising:

and a codebook resource allocation module, configured to allocate codebook resources to each terminal device based on the determined priority and second transmission quality information, where the second transmission quality information is used to characterize transmission quality when data is transmitted to each terminal device based on each codebook resource.

9. A base station is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor and the communication interface are used for realizing the communication between the processor and the memory through the communication bus;

a memory for storing a computer program;

a processor for implementing the method steps of any of claims 1 to 7 when executing a program stored in the memory.

10. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of claims 1 to 7.