CN111148249B - Network resource allocation method and device - Google Patents
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- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
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Abstract
The embodiment of the invention discloses a network resource allocation method and a device, which are applied to an LTE-U system, wherein the method comprises the following steps: receiving a downlink reference signal from a base station, and calculating to obtain the signal-to-interference-plus-noise ratios of different subcarriers of user equipment on each carrier component; then, the equivalent signal to interference plus noise ratio of the user equipment on the carrier component is obtained through conversion, and the channel quality of the user equipment on the carrier component is obtained according to a preset mapping relation; judging whether the user equipment is interfered by a Wi-Fi system or not according to the channel quality and a preset user equipment classification model; and allocating the network resources used by the user equipment according to whether the user equipment is interfered by the Wi-Fi system. By implementing the invention, the problem that the hidden terminal in the prior related technology influences the network resource allocation is solved, so that an optimal network resource allocation scheme is obtained to ensure the throughput of a downlink and the service quality requirement of a user.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a network resource allocation method and device.
Background
With the rapid growth in the number of mobile devices and applications, the limited licensed spectrum in existing cellular networks has difficulty meeting current mobile data service requirements. In addition, since the licensed spectrum is very scarce and expensive, operators propose an Unlicensed frequency band sharing technology (LTE-U), aiming to relieve mobile communication pressure through a large amount of available resources on the Unlicensed spectrum. The LTE-U utilizes existing carrier aggregation techniques to aggregate licensed and unlicensed frequency bands, thereby providing greater coverage area and network capacity. However, since the LTE-U and the Wi-Fi system use different unlicensed channel access mechanisms, the introduction of the LTE-U will seriously affect the performance of the system. Therefore, a fair and effective coexistence mechanism needs to be designed to ensure the harmonious coexistence of the two networks.
In the existing related art, two coexistence mechanisms exist, namely Listen Before Talk (Listen Before Talk, LBT) and Carrier Sense Adaptive Transmission (CSAT), and different areas require different mechanisms to ensure the harmonious coexistence of the LTE-U and the Wi-Fi system. In a scenario where LTE-U and Wi-Fi coexist, even if the two coexistence mechanisms are adopted, when an LTE-U transmitter is outside the sensing range of a Wi-Fi transmitter or a Wi-Fi transmitter is outside the sensing range of the LTE-U transmitter, neither of them can monitor the other, resulting in data collision and transmission failure, and generating a hidden terminal problem, so that the coexistence mechanism cannot guarantee fairness of the two systems, and affects allocation of network resources.
Disclosure of Invention
Therefore, the present invention provides a method and an apparatus for allocating network resources, so as to overcome the defect in the prior art that the coexistence mechanism in the related art may cause the LTE-U system and the Wi-Fi system to conflict, thereby affecting the network resource allocation.
According to a first aspect, an embodiment of the present invention discloses a network resource allocation method, which is applied to an LTE-U system, where the LTE-U system includes: the method comprises the following steps: receiving a downlink reference signal from a base station; calculating to obtain the signal to interference plus noise ratios of different subcarriers of the user equipment on each carrier component according to the downlink reference signal of the base station; converting according to the signal to interference plus noise ratios of different subcarriers of the user equipment on each carrier component to obtain an equivalent signal to interference plus noise ratio of the user equipment on the carrier component; obtaining the channel quality of the user equipment on the carrier component according to the equivalent signal-to-interference-plus-noise ratio of the user equipment on the carrier component and a preset mapping relation; judging whether the user equipment is interfered by a Wi-Fi system or not according to the channel quality of the user equipment on the carrier component and a preset user equipment classification model; and allocating the network resources used by the user equipment according to whether the user equipment is interfered by the Wi-Fi system.
With reference to the first aspect, in a first implementation manner of the first aspect, the signal-to-interference-plus-noise ratios of different subcarriers of the user equipment on each carrier component are calculated by the following formula:
wherein, the first and the second end of the pipe are connected with each other,
signal to interference plus noise ratio, representing different subcarriers of said user on respective carrier components, in conjunction with a channel selection algorithm, based on a channel selection algorithm>
And &>
Respectively representing the transmission power and the channel gain, sigma, of the user 2 Representing the power of additive white Gaussian noise, p w And g k,w Respectively representing the transmission power and channel gain, W, of Wi-Fi w,k Is a collection of radio access nodes around the user and using the same channel.
With reference to the first aspect, in a second implementation manner of the first aspect, the building the user equipment classification model includes: acquiring user equipment with classification labels and corresponding channel quality in a target time period, wherein the classification labels comprise users interfered by a Wi-Fi system and users not interfered by the Wi-Fi system; and obtaining a user equipment classification model according to the user equipment with the classification label in the target time period and the corresponding channel quality.
With reference to the first implementation manner of the first aspect, in a third implementation manner of the first aspect, the allocating network resources used by the user equipment according to whether the user equipment is interfered by the Wi-Fi system includes: according to the same type of user equipment which is not interfered by a Wi-Fi system on the subcarrier, determining the distribution limiting condition of the subcarrier and the downlink transmission rate of the user equipment; and determining the allocation of network resources in a downlink in the LTE-U system according to the allocation limiting condition of the subcarrier, the preset service quality limiting condition of the user equipment in the authorized frequency band, the preset service quality limiting condition on the unauthorized frequency band, the preset authorized power limiting condition and the preset power limiting condition on the unauthorized frequency band.
With reference to the third implementation manner of the first aspect, in a fourth implementation manner of the first aspect, the allocation of network resources in the downlink in the LTE-U system is calculated by the following formula:
wherein the content of the first and second substances,
indicating the allocation index of the sub-carriers.
With reference to the third implementation manner of the first aspect, in a fifth implementation manner of the first aspect, the downlink transmission rate of each type of user equipment that is not interfered by the Wi-Fi system is calculated by the following formula:
wherein, the first and the second end of the pipe are connected with each other,
denotes a downlink transmission rate of the user equipment, and B denotes a subchannel bandwidth of a downlink.
With reference to the third implementation manner of the first aspect, in a sixth implementation manner of the first aspect, the allocation restriction condition of the subcarriers, the preset qos restriction condition of the user equipment in the licensed frequency band and the qos restriction condition of the user equipment in the unlicensed frequency band, and the preset authorized power restriction condition and the preset power restriction condition of the user equipment in the unlicensed frequency band are calculated by the following formulas:
wherein, K m Representing a set of user equipments on said sub-carriers that are not interfered by the Wi-Fi system, the constraints (1 a) and (1 b) being presetThe constraint (1 c) represents a service quality limiting condition of the preset user equipment in the authorized frequency band, the constraint (1 d) represents a service quality limiting condition of the preset user equipment in the unlicensed frequency band, the constraint (1 e) represents a preset licensed power limiting condition, and the constraint (1 f) represents a preset unlicensed power limiting condition.
With reference to the third implementation manner of the first aspect, in a seventh implementation manner of the first aspect, the determining, according to the allocation restriction condition of the subcarrier, a preset qos restriction condition of the user equipment in the licensed frequency band and a qos restriction condition of the user equipment in the unlicensed frequency band, and a preset authorized power restriction condition and a preset power restriction condition of the user equipment in the unlicensed frequency band, allocation of network resources in a downlink in the LTE-U system includes: determining the allocation of the authorized resource according to the allocation limiting condition of the sub-carriers on the authorized frequency band, the preset service quality limiting condition of the user equipment in the authorized frequency band and the preset authorized power limiting condition, wherein the method comprises the following steps: calculating subcarrier distribution indexes according to a relaxation algorithm; according to the relaxed subcarrier distribution index, reducing the requirements of a preset service quality limiting condition and a preset power limiting condition of user equipment through a Lagrange dual decomposition algorithm, and obtaining the resource distribution problem on the authorized carrier component subcarrier; and adjusting the resource allocation on the authorized carrier wave division sub-carrier according to a preset power allocation limiting condition and a preset sub-carrier wave allocation limiting condition, and determining the allocation of the authorized resource.
With reference to the third implementation manner of the first aspect, in an eighth implementation manner of the first aspect, the allocation of the granted resources is determined by the following formula:
wherein the content of the first and second substances,
an allocation index representing a carrier component;
calculating the distribution limiting condition according to the sub-carriers on the authorized frequency band, the preset service quality limiting condition of the user equipment in the authorized frequency band and the preset authorized frequency band power limiting condition according to the following formula:
wherein the content of the first and second substances,
representing a downlink transmission rate of the user equipment on the licensed frequency band,
determining the rate of the user equipment on the authorized frequency band according to the result of resource allocation on the authorized frequency band by the following formula:
wherein the content of the first and second substances,
represents an allocation of an optimal subcarrier on an authorized carrier component, based on the number of subcarriers in the grant field, and>
indicating an optimal power allocation on the licensed carrier component.
With reference to the third implementation manner of the first aspect, in a ninth implementation manner of the first aspect, the determining, according to the allocation restriction condition of the subcarrier, a preset qos restriction condition of the user equipment in the licensed frequency band and a qos restriction condition of the user equipment in the unlicensed frequency band, and a preset authorized power restriction condition and a preset power restriction condition of the user equipment in the unlicensed frequency band, allocation of network resources in a downlink in the LTE-U system includes: determining the allocation of the unlicensed resources according to an allocation restriction condition of subcarriers on an unlicensed frequency band, a preset quality of service restriction condition of user equipment in the unlicensed frequency band, and a preset power restriction condition of the unlicensed frequency band, wherein the method comprises the following steps: calculating subcarrier distribution indexes according to a relaxation algorithm; according to the relaxed subcarrier distribution index, reducing the requirements of a preset service quality limiting condition and a preset power limiting condition of user equipment through a Lagrange dual decomposition algorithm, and obtaining the resource distribution problem on the unauthorized carrier component subcarrier; and adjusting the resource allocation on the unauthorized carrier wave division sub-carrier according to a preset power allocation limiting condition and a preset sub-carrier wave allocation limiting condition, and determining the allocation of the unauthorized resource.
With reference to the third implementation manner of the first aspect, in a tenth implementation manner of the first aspect, the allocation of the unlicensed resource is determined by the following formula:
wherein, the first and the second end of the pipe are connected with each other,
an allocation index representing a non-carrier component;
calculating the distribution limiting condition according to the sub-carriers on the unlicensed frequency band, the preset service quality limiting condition of the user equipment on the unlicensed frequency band and the preset unlicensed power limiting condition according to the following formula:
wherein the content of the first and second substances,
representing a downlink transmission rate of the user equipment on the unlicensed frequency band.
According to a second aspect, an embodiment of the present invention discloses a network resource allocation apparatus, including: a receiving module, configured to receive a downlink reference signal from a base station; a calculating module, configured to calculate, according to the downlink reference signal of the base station, a signal-to-interference-plus-noise ratio of different subcarriers of the ue on each carrier component; a conversion module, configured to convert, according to the signal to interference plus noise ratios of different subcarriers of the ue on each carrier component, to obtain an equivalent signal to interference plus noise ratio of the ue on the carrier component; a channel quality obtaining module, configured to obtain channel quality of the ue on a carrier component according to an equivalent signal-to-interference-plus-noise ratio of the ue on the carrier component and a preset mapping relationship; the judging module is used for judging whether the user equipment is interfered by the Wi-Fi system or not according to the channel quality of the user equipment on the carrier component and a preset user equipment classification model; and the allocation module is used for allocating the network resources used by the user equipment according to whether the user equipment is interfered by the Wi-Fi system.
According to a third aspect, an embodiment of the present invention discloses a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps of the network resource allocation method according to the first aspect or any one of the implementation manners of the first aspect.
The technical scheme of the invention has the following advantages: advantages of the independent claims and advantages of the dependent claims are described in turn, respectively.
1. The invention provides a network resource allocation method and a device, which are applied to an LTE-U system, wherein the method comprises the following steps: receiving a downlink reference signal from a base station, and calculating to obtain the signal-to-interference-plus-noise ratios of different subcarriers of user equipment on each carrier component; then, converting to obtain equivalent signal to interference plus noise ratio of the user equipment on the carrier component, and obtaining the channel quality of the user equipment on the carrier component according to a preset mapping relation; judging whether the user equipment is interfered by a Wi-Fi system or not according to the channel quality of the user equipment and a preset user equipment classification model; and allocating the network resources used by the user equipment according to whether the user equipment is interfered by the Wi-Fi system. By implementing the invention, the problem that the network resource allocation is influenced due to the hidden terminal problem in the prior art is solved, and the network resources on the authorized frequency band and the resources on the unauthorized frequency band are combined in the LTE-U system, so that an optimal network resource allocation scheme is obtained, and the throughput requirement of a downlink and the requirement of the service quality of a user are ensured.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram of a specific example of an LTE-U system according to the present invention;
fig. 2 is a flowchart of a specific example of a network resource allocation method in embodiment 1 of the present invention;
fig. 3 is a flowchart of a specific example of determining authorized resource allocation in a network resource allocation method according to embodiment 1 of the present invention;
fig. 4 is a flowchart of a specific example of determining unauthorized resource allocation in a network resource allocation method according to embodiment 1 of the present invention;
fig. 5 is a schematic block diagram of a specific example of a network resource allocation apparatus in embodiment 2 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The method and the device for allocating network resources provided by the embodiments of the present invention are applied to an LTE-U system, and as shown in fig. 1, the LTE-U system includes a base station, a user equipment, and a wireless Access node (Wi-Fi APs), and specifically, may be configured such that K user equipments and a plurality of Wi-Fi APs share network resources on an unauthorized frequency band. The base station provides downlink transmission rate for the user by aggregating a plurality of carrier components, the base station performs bidirectional communication with the user equipment through an uplink of the LTE-U system and a downlink of the LTE-U system, and a set of the plurality of carrier components can be represented by M = {0,1, \8230;, M }, wherein M =0 represents a carrier component on a licensed band, {1, \8230;, M } represents a set of carrier components on an unlicensed band. Each carrier component is divided into N sub-carriers, and the sub-carriers on the m carrier component can be set
And (4) showing.
In a scenario where an LTE-U system and a Wi-Fi system coexist, as shown in fig. 1, there may be four situations, and when a location of a user equipment is shown as a first user equipment 1, at this time, the first user equipment 1 only performs bidirectional communication with the LTE-U system, and is not affected by the Wi-Fi system; when the user equipment is in the radiation range of the LTE-U system base station, and at this time, no matter the position of the wireless access node is in the radiation range of the LTE-U system base station, or outside the radiation range of the LTE-U system base station, or on the radiation range of the LTE-U system base station, when the user equipment is in bidirectional communication with the LTE-U system, a hidden terminal problem is generated due to interference of the Wi-Fi system, as shown in fig. 1, the second user equipment 2, the third user equipment 3, and the fourth user equipment 4, that is, when the user in the LTE-U is interfered by the Wi-Fi system, that is, the Wi-Fi system contends for network resources on an unlicensed frequency band with the user in the LTE-U system, which affects normal use of network resources by the user, at this time, the LTE-U system adopts a channel access mechanism of carrier sense multiple access and collision avoidance, and the LTE-U system adopts a channel access mechanism of "Listen Before Talk" (Listen Before Talk, when the wireless access base station is outside the radiation range, which affects the wireless access node, or the other party cannot allocate a hidden terminal to the hidden terminal, which may cause a problem of hidden terminal to the problem of monitoring and a problem of the hidden terminal is solved.
An embodiment of the present invention provides a network resource allocation method, which may be applied in a wireless communication network, in a specific application scenario where new resources need to be developed due to insufficient resources caused by a rapid increase of the number of mobile devices and applications, and thus network resources need to be allocated again, as shown in fig. 2, the network resource allocation method in this embodiment includes:
step S11: a downlink reference signal is received from a base station. In this embodiment, a Base Station (BS) is an essential component of an LTE-U system, and the Base Station is a public mobile communication Base Station, which is a form of a radio Station, and refers to a radio transceiver Station that performs information transmission with user equipment through a mobile communication switching center in a certain radio coverage area; the base station communicates with the user equipment through a downlink, and the downlink reference signal comprises physical quantities such as transmission power, channel gain, additive white gaussian noise power existing in the transmission process and the like of the user equipment.
Step S12: and calculating the signal-to-interference-plus-noise ratio of different subcarriers of the user equipment on each carrier component according to the downlink reference signal of the base station.
Illustratively, the user equipment may be LTE-U users in an LTE-U system, where K user equipments may exist for communicating with the base station through a downlink respectively; the carrier component may be a carrier component on a licensed frequency band, denoted by M =0, or may be a set of carrier components on an unlicensed frequency band, denoted by {1, \8230;, M }, where a base station in the LTE-U system may provide a higher downlink transmission rate meeting a requirement of a user equipment for a plurality of user equipments by aggregating the carrier component on the licensed frequency band and the carrier component on the unlicensed frequency band, and specifically, each carrier component may be divided into N subcarriers, and thus, the subcarrier on the mth carrier component may be denoted by a set Nm; the Signal to Interference plus Noise Ratio (SINR) represents a Ratio of the strength of a received useful Signal to the strength of a received Interference Signal, that is, represents a Signal to Noise Ratio, specifically, the useful Signal may be a Signal component carrying effective information during channel transmission, and the Interference Signal may be Noise and an Interference Signal generated during channel transmission, for example, additive white gaussian Noise.
Step S13: and converting the signal to interference plus noise ratio of different subcarriers on each carrier component according to the user equipment to obtain the equivalent signal to interference plus noise ratio of the user equipment on the carrier component.
For example, after calculating the signal to interference plus noise ratios of different subcarriers of the ue on each carrier component according to the downlink reference signal, the wideband compression technique may convert the signal to interference plus noise ratios of different subcarriers of the ue on each carrier component into equivalent signal to noise ratios of the ue on the carrier component.
Step S14: obtaining the channel quality of the user equipment on the carrier component according to the equivalent signal-to-interference-plus-noise ratio of the user equipment on the carrier component and a preset mapping relation; in this embodiment, the preset mapping relationship may be channel qualities of different user equipments on a carrier component corresponding to different signal-to-interference-plus-noise ratios, specifically, the first signal-to-interference-plus-noise ratio is X1, the corresponding first channel quality is Y1, the second signal-to-interference-plus-noise ratio is X2, and the corresponding second channel quality is Y2, a fitting relationship curve of the signal-to-interference-plus-noise ratio and the channel quality may be obtained through a plurality of historical data fitting calculations, and the fitting relationship curve may be used as the preset mapping relationship, so that the equivalent signal-to-noise ratio of the user equipment on the carrier component obtained through the above steps may be obtained through the mapping relationship.
Step S15: and judging whether the user equipment is interfered by the Wi-Fi system or not according to the channel quality of the user equipment on the carrier component and a preset user equipment classification model.
For example, according to different channel qualities of different user equipments on a carrier component, the classification of the user equipments can be obtained through a preset user equipment classification model, and the classification is interfered by a Wi-Fi system or is not interfered by the Wi-Fi system.
Step S16: according to whether various user equipment is interfered by a Wi-Fi system to distribute network resources used by various user equipment, in the embodiment, firstly, the user equipment is confirmed to be interfered by the Wi-Fi system or not to be interfered by the Wi-Fi system, and for user equipment k which is not interfered by the Wi-Fi system, carrier components on an unauthorized frequency band in the network resources can be distributed, and the user equipment k belongs to a user set which can be distributed with resources of the unauthorized frequency band and can be represented by Km; for LTE-U user equipment interfered by a Wi-Fi system, the base station may allocate other carrier components to such user equipment to avoid interference of the Wi-Fi system, where the other carrier components may be carrier components on an authorized frequency band or carrier components on an unauthorized frequency band, that is, at this time, for all user equipment, it may be considered that interference of the Wi-Fi system is not received at this time. At this time, the network resources on the licensed frequency band and the network resources on the unlicensed frequency band may be allocated to the user equipment.
The embodiment of the invention provides a network resource allocation method and a device, which are applied to an LTE-U system, wherein the method comprises the following steps: receiving a downlink reference signal from a base station, and calculating to obtain the signal-to-interference-plus-noise ratios of different subcarriers of user equipment on each carrier component; then, converting to obtain equivalent signal to interference plus noise ratio of the user equipment on the carrier component, and obtaining the channel quality of the user equipment on the carrier component according to a preset mapping relation; judging whether the user equipment is interfered by a Wi-Fi system or not according to the channel quality of the user equipment and a preset user equipment classification model; and allocating the network resources used by the user equipment according to whether the user equipment is interfered by the Wi-Fi system. By implementing the invention, the problem that the network resource allocation is influenced due to the hidden terminal problem in the prior art is solved, and the network resources on the authorized frequency band and the resources on the unauthorized frequency band are combined in the LTE-U system, so that an optimal network resource allocation scheme is obtained, and the throughput requirement of a downlink and the requirement of the service quality of a user are ensured.
As an optional implementation manner of the present application, the step S12 specifically includes: calculating the signal-to-interference-plus-noise ratio of different subcarriers of the user equipment on each carrier component by the following formula:
wherein the content of the first and second substances,
signal to interference plus noise ratio, representing different sub-carriers of the user on each carrier component, is/are->
And &>
Respectively representing the transmission power and the channel gain, σ, of the user 2 Representing the power of additive white Gaussian noise, p w And g k,w Respectively representing the transmission power and channel gain, W, of Wi-Fi w,k Is in useA set of wireless access nodes around a user and using the same channel.
By the formula, the reference signal of the downlink is comprehensively considered when the user equipment communicates with the base station, and compared with the prior art, the signal-to-noise ratio of the user equipment on each carrier component can be more accurately obtained according to the signal-to-noise ratios on different subcarriers.
As an optional implementation manner of the present application, step S16, allocating network resources used by various user equipments according to whether the various user equipments are interfered by the Wi-Fi system specifically includes:
determining the distribution limiting conditions of the subcarriers and the downlink transmission rate of the user equipment according to the same user equipment which is not interfered by a Wi-Fi system on the subcarriers;
and determining the allocation of network resources in a downlink in the LTE-U system according to the allocation limiting condition of the sub-carrier, the preset service quality limiting condition of the user equipment in the authorized frequency band, the preset service quality limiting condition on the unauthorized frequency band, the preset authorized power limiting condition and the preset power limiting condition on the unauthorized frequency band.
Exemplarily, the constraint condition for allocation of subcarriers represents a constraint condition for allocation indexes of subcarriers in a carrier component in network resource allocation, specifically a constraint condition for subcarrier allocation indexes of a user equipment which can allocate network resources in an unlicensed band, and a constraint condition for subcarrier allocation indexes of a user equipment which cannot allocate network resources in an unlicensed band; the service quality limiting conditions comprise that service quality indexes comprise time delay, throughput, packet loss rate, fairness and the like; the power constraint is a power constraint that is to be satisfied by the power generated by the allocated network resource.
Specifically, the downlink transmission rate of each type of user equipment which is not interfered by the Wi-Fi system can be calculated by the following formula:
wherein, the first and the second end of the pipe are connected with each other,
denotes a downlink transmission rate of the user equipment, and B denotes a subchannel bandwidth of the downlink.
Specifically, the allocation of network resources in the downlink in LTE-U systems can be calculated by the following formula:
wherein the content of the first and second substances,
indicating the allocation index of the sub-carriers.
As an optional implementation manner of this application, the method for allocating network resources provided in the embodiment of the present invention further includes: calculating the distribution limit condition of the sub-carrier, the preset service quality limit condition of the user equipment on the authorized frequency band, the preset service quality limit condition on the unauthorized frequency band, the preset authorized power limit condition and the preset power limit condition on the unauthorized frequency band by the following formula:
wherein, K m The method comprises the steps that a user equipment set which is not interfered by a Wi-Fi system is represented on a subcarrier, constraints (1 a) and (1 b) are preset subcarrier allocation limiting conditions, constraint (1 c) represents a service quality limiting condition of preset user equipment in an authorized frequency band, constraint (1 d) represents a service quality limiting condition of the preset user equipment in an unauthorized frequency band, constraint (1 e) represents a preset authorized power limiting condition, and constraint (1 f) represents a preset unauthorized power limiting condition.
The allocation of the network resources of the downlink in the LTE-U system is obtained through the formula, compared with the existing network resource allocation scheme, the situation that the LTE-U system conflicts with the Wi-Fi system can be effectively avoided, so that the resources allocated on the unauthorized frequency band in the LTE-U system can not be interfered by the Wi-Fi system, the optimal network resource allocation scheme is obtained, the utilization rate of the network resources is improved, and the cost of the network resource allocation is reduced to a certain extent.
As an optional implementation manner of the present application, the method for allocating network resources provided in the embodiment of the present invention establishes a preset user equipment classification model, including: acquiring user equipment with classification labels and corresponding channel quality in a target time period, wherein the classification labels comprise users interfered by a Wi-Fi system and users not interfered by the Wi-Fi system; and obtaining a user equipment classification model according to the user equipment with the classification label in the target time period and the corresponding channel quality.
In this embodiment, the user equipment may upload the channel quality on each carrier component on the network resource through an uplink to the LTE-U base station, and the LTE-U base station may classify the user equipment by acquiring sample data with a label uploaded by a plurality of user equipment within a target time period, where the label of the user equipment may be interfered by a Wi-Fi system or may not be interfered by the Wi-Fi system, and obtaining a user equipment classification model through logistic regression binary classification algorithm training according to characteristics of the channel quality of each user equipment on different carrier components on the network resource. The assignable user set on the carrier component on each unlicensed frequency band can be determined through the user equipment classification model.
By establishing the user equipment classification model, in the network resource allocation scheme, the class of the user equipment can be more accurately determined through the user equipment classification model, and whether the user equipment is interfered by a Wi-Fi system or not can be more accurately determined, so that whether the user equipment belongs to the user class which can be allocated with the network resources on the unauthorized frequency band or not can be more accurately determined, the network resource allocation efficiency is improved, and the network resource allocation cost is reduced.
As an optional implementation manner of this application, a network resource allocation method provided in this embodiment of the present invention determines allocation of network resources in a downlink in an LTE-U system according to an allocation restriction condition of a subcarrier, a preset qos restriction condition of a user equipment in an authorized frequency band, a qos restriction condition on an unlicensed frequency band, and a preset power restriction condition of authorization and a power restriction condition on an unlicensed frequency band, where in this embodiment, allocation of network resources in a downlink in an LTE-U system may be split into a network resource allocation problem in an authorized frequency band and a network resource allocation problem in an unlicensed frequency band, and as shown in fig. 3, the method further includes:
determining the allocation of authorized resources according to the allocation limiting condition of subcarriers in the authorized frequency band, the downlink transmission rate of user equipment in the authorized frequency band, the preset service quality limiting condition of the user equipment in the authorized frequency band and the preset power limiting condition of the authorized frequency band, wherein the method comprises the following steps:
step S21: calculating subcarrier distribution indexes according to a relaxation algorithm; in this embodiment, by relaxing the subcarrier allocation index, that is, relaxing the constraint condition of the non-convex problem into the constraint condition of the convex problem, the resource allocation problem in the authorized frequency band may be converted from the non-convex problem into the convex problem, that is, after the network resource allocation problem in the authorized frequency band is converted into the convex problem, the local optimal solution is the global optimal solution, specifically, the relaxation algorithm is a common algorithm in solving the optimization problem, and the relaxation algorithm may be used, or the lagrangian relaxation algorithm may be used.
Step S22: and according to the relaxed subcarrier distribution index, reducing the requirements of the preset service quality limiting condition and the preset power limiting condition of the user equipment through a Lagrange dual decomposition algorithm, and obtaining the resource distribution problem on the authorized carrier component subcarrier. In this embodiment, after the resource allocation problem on the authorized frequency band is converted from the non-convex problem to the convex problem, a local optimal solution is obtained, which is then a global optimal solution, specifically, the above-mentioned qos constraint and the preset power allocation constraint of the ue are relaxed by a low-complexity lagrangian dual decomposition algorithm, so as to obtain the resource allocation problem on the carrier component on the authorized frequency band, and then, since the local optimal solution is the global optimal solution, the resource allocation problem on the carrier component on the authorized frequency band can be solved by solving the network resource allocation problem on a single subcarrier on the carrier component.
Step S23: and adjusting the resource allocation on the component subcarriers of the authorized carrier according to the preset power allocation limiting condition and the preset subcarrier allocation limiting condition, and determining the allocation of the authorized resources.
Specifically, the allocation of granted resources is determined by the following formula:
wherein the content of the first and second substances,
an allocation index representing a carrier component;
calculating the distribution limit condition according to the sub-carrier on the authorized frequency band, the preset service quality limit condition of the user equipment in the authorized frequency band and the preset authorized power limit condition according to the following formula:
wherein the content of the first and second substances,
representing a downlink transmission rate of a user equipment on the licensed frequency band;
determining the rate of the user equipment on the unlicensed frequency band according to the result of resource allocation on the licensed frequency band by the following formula:
wherein the content of the first and second substances,
indicating on a licensed carrier componentIs based on the optimal subcarrier allocation, is based on>
Indicating an optimal power allocation on the licensed carrier component.
The allocation of the network resources on the authorized frequency band in the LTE-U system is obtained through the formula, compared with the existing network resource allocation scheme, the problem of hiding a terminal is solved, the network resource allocation scheme is obtained, the allocation of the authorized resources is adjusted according to the system requirements, the allocation of the authorized frequency band resources is completed under the condition that the requirements of service quality of all users are met, the utilization rate of the network resources is improved, and the cost of the network resource allocation is reduced.
As an optional implementation manner of this application, in the network resource allocation method provided in this embodiment of the present invention, the allocation of network resources in a downlink in an LTE-U system is determined according to an allocation restriction condition of a subcarrier, a preset qos restriction condition of a user equipment in an authorized frequency band, a preset qos restriction condition on an unlicensed frequency band, and a preset power restriction condition of an authorization and a power restriction condition on an unlicensed frequency band, in this embodiment, the allocation of network resources in a downlink in an LTE-U system may be split into a network resource allocation problem on an authorized frequency band and a network resource allocation problem on an unlicensed frequency band, as shown in fig. 4, the network resource allocation method further includes:
determining the allocation of the unlicensed resources according to an allocation restriction condition of subcarriers on an unlicensed frequency band, a preset quality of service restriction condition of user equipment in the unlicensed frequency band, and a preset power restriction condition of the unlicensed frequency band, wherein the method comprises the following steps:
step S31: calculating subcarrier distribution indexes according to a relaxation algorithm; in this embodiment, by relaxing the subcarrier allocation index, that is, relaxing the constraint condition of the non-convex problem into the constraint condition of the convex problem, the resource allocation problem in the unlicensed frequency band may be converted from the non-convex problem into the convex problem, that is, after the network resource allocation problem in the unlicensed frequency band is converted into the convex problem, the local optimal solution is the global optimal solution, specifically, the relaxation algorithm is a common algorithm in solving the optimization problem, and may use the relaxation algorithm or the lagrangian relaxation algorithm.
Step S32: according to the relaxed subcarrier distribution index, reducing the requirements of a preset service quality limiting condition and a preset power limiting condition of user equipment through a Lagrange dual decomposition algorithm to obtain the resource distribution problem on the unauthorized carrier component subcarrier; and according to the reduced subcarrier distribution index, reducing the requirements of the preset service quality limiting condition and power limiting condition of the user equipment through a Lagrange dual decomposition algorithm to obtain the resource distribution problem on the subcarriers. In this embodiment, when the resource allocation problem in the unlicensed frequency band is converted from the non-convex problem to the convex problem, a local optimal solution is obtained, which is then a global optimal solution, specifically, the above-mentioned qos constraint condition and the preset power allocation constraint condition of the ue are relaxed by using a low-complexity lagrangian dual decomposition algorithm, so as to obtain the resource allocation problem in the carrier component in the unlicensed frequency band, and then, since the local optimal solution is the global optimal solution, the resource allocation problem in the carrier component in the unlicensed frequency band can be solved by solving the network resource allocation problem in a single subcarrier in the carrier component.
Step S33: and adjusting the resource allocation on the unauthorized carrier wave division sub-carrier waves according to a preset power allocation limiting condition and a preset sub-carrier wave allocation limiting condition, and determining the unauthorized resource allocation.
Specifically, the allocation of the unlicensed resources is determined by the following formula:
wherein the content of the first and second substances,
representAn allocation index of the non-carrier component;
calculating the distribution limiting condition according to the sub-carriers on the unlicensed frequency band, the preset service quality limiting condition of the user equipment on the unlicensed frequency band and the preset unlicensed power limiting condition according to the following formula:
wherein the content of the first and second substances,
representing a downlink transmission rate of the user equipment on the unlicensed frequency band.
The allocation of the network resources on the unlicensed frequency band in the LTE-U system is obtained through the formula, whether the user equipment is interfered by the Wi-Fi system or not is distinguished through a preset user equipment classification model, so that a network resource allocation scheme is obtained, after the unlicensed resource allocation is completed, the allocation of the unlicensed resources is adjusted again according to the relaxed subcarrier allocation index required by the system, the power limiting condition on the relaxed subcarrier and the service quality limiting condition, the utilization rate of the network resources is improved under the condition that the service quality requirements of all users are met and the downlink obtains the maximum throughput, and the cost of the network resource allocation is reduced.
Example 2
An embodiment of the present invention provides a network resource allocation apparatus, which may be applied to a wireless communication network, in a specific application scenario where new resources need to be developed due to insufficient resources caused by rapid increase of the number of mobile devices and applications, and network resources need to be reallocated, as shown in fig. 5, the apparatus includes:
the receiving module 41 is configured to receive a downlink reference signal from a base station, and details of implementation may refer to the related description of step S11 in the above method embodiment.
The calculating module 42 is configured to calculate, according to the downlink reference signal of the base station, to obtain the signal-to-interference-plus-noise ratios of different subcarriers of the ue on each carrier component, and the detailed implementation contents may refer to the related description of step S12 in the above method embodiment.
A converting module 43, configured to obtain an equivalent signal-to-interference-plus-noise ratio on the carrier component of the user equipment according to the conversion of the signal-to-interference-plus-noise ratios of different subcarriers on each carrier component of the user equipment, and for details of implementation, reference may be made to the related description of step S13 in the foregoing method embodiment.
The channel quality obtaining module 44 is configured to obtain the channel quality of the ue on the carrier component according to the equivalent signal-to-interference-plus-noise ratio of the ue on the carrier component and a preset mapping relationship, and for details, reference may be made to the related description of step S14 in the above method embodiment.
The determining module 45 is configured to determine whether the ue is interfered by the Wi-Fi system according to the channel quality of the ue on the carrier component and a preset ue classification model, and for details of implementation, reference may be made to the related description of step S15 in the foregoing method embodiment.
The allocating module 46 is configured to allocate network resources used by various user equipments according to whether the various user equipments are interfered by the Wi-Fi system, and the detailed implementation contents may refer to the related description of step S16 in the above method embodiment.
The embodiment of the invention discloses a network resource allocation device, which is applied to an LTE-U system, wherein the device comprises: the downlink reference signal from the base station received by the receiving module can obtain the signal to interference plus noise ratio of different subcarriers of the user equipment on each carrier component through the calculating module, and then the equivalent signal to interference plus noise ratio of the user equipment on the carrier component can be obtained through conversion by the converting module; the channel quality of the user equipment on the carrier component is obtained through the channel quality obtaining module according to the preset mapping relation, whether the user equipment is interfered by a Wi-Fi system or not is judged through the judging module according to the channel quality of the user equipment and the preset user equipment classification model, and finally network resources used by various user equipment are distributed. The method and the device have the advantages that the user equipment is classified by combining downlink reference signals in the communication process of the base station and the user equipment, network resources are distributed to the user equipment according to different categories, the problems that an LTE-U system and Wi-Fi in the existing network resource distribution technology are interfered with each other and cannot coexist fairly, and then network distribution is affected are solved, the efficiency of the network resources is improved, optimal network resources can be distributed to the user equipment, the downlink transmission rate is increased as much as possible under the requirement of guaranteeing the service quality of the user equipment, and the network communication performance is improved.
Example 3
The embodiment of the present invention further provides a non-transitory computer readable medium, where the non-transitory computer readable storage medium stores a computer instruction, and the computer instruction is used to enable a computer to execute the network resource allocation method described in any one of the above embodiments, where the storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid-State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (13)
1. A network resource allocation method is applied to an LTE-U system, and the LTE-U system comprises the following steps: the base station, the user equipment and the wireless access node are characterized in that the method comprises the following steps:
receiving a downlink reference signal from a base station;
calculating to obtain the signal to interference plus noise ratios of different subcarriers of the user equipment on each carrier component according to the downlink reference signal of the base station;
converting according to the signal to interference plus noise ratios of different subcarriers of the user equipment on each carrier component to obtain an equivalent signal to interference plus noise ratio of the user equipment on the carrier component;
obtaining the channel quality of the user equipment on the carrier component according to the equivalent signal-to-interference-plus-noise ratio of the user equipment on the carrier component and a preset mapping relation;
judging whether the user equipment is interfered by a Wi-Fi system or not according to the channel quality of the user equipment on the carrier component and a preset user equipment classification model;
and allocating the network resources used by the user equipment according to whether the user equipment is interfered by the Wi-Fi system.
2. The method according to claim 1, wherein the signal to interference plus noise ratio of different subcarriers of the user equipment on each carrier component is calculated by the following formula:
wherein the content of the first and second substances,
signal to interference plus noise ratio, representing different sub-carriers of said user on respective carrier components, is/are->
And &>
Respectively representing the transmission power and the channel gain, sigma, of the user 2 Representing the power of additive white Gaussian noise, p w And g k,w Respectively representing the transmission power and channel gain, W, of Wi-Fi w,k Is a set of radio access nodes around a user and using the same channel, m denotes an index value of a carrier component, k denotes an index value of an LTE-U user, n denotes an index value of a subcarrier, w denotes an index value of Wi-Fi, and m =0 denotes a carrier component on a licensed band.
3. The method of claim 1, wherein building the classification model of the user equipment comprises:
obtaining user equipment with classification labels and corresponding channel quality in a target time period, wherein the classification labels comprise users interfered by a Wi-Fi system and users not interfered by the Wi-Fi system;
and obtaining a user equipment classification model according to the user equipment with the classification label in the target time period and the corresponding channel quality.
4. The method of claim 2, wherein the allocating network resources used by the user equipment according to whether the user equipment is interfered by a Wi-Fi system comprises:
according to the same type of user equipment which is not interfered by a Wi-Fi system on the subcarrier, determining the distribution limiting condition of the subcarrier and the downlink transmission rate of the user equipment;
and determining the allocation of network resources in a downlink in the LTE-U system according to the allocation limiting condition of the sub-carrier, the preset service quality limiting condition of the user equipment in the authorized frequency band, the preset service quality limiting condition on the unauthorized frequency band, the preset authorized power limiting condition and the preset power limiting condition on the unauthorized frequency band.
5. The method according to claim 4, wherein the allocation of network resources in the downlink in the LTE-U system is calculated by the following formula:
wherein the content of the first and second substances,
represents an assignment index of the subcarrier, is present>
Representing a downlink transmission rate of the user equipment.
6. The method of claim 4, wherein the downlink transmission rate of each type of user equipment that is not interfered by the Wi-Fi system is calculated according to the following formula:
wherein, the first and the second end of the pipe are connected with each other,
represents a downlink transmission rate of the user equipment, B denotes the subchannel bandwidth of the downlink, is>
Indicating the allocation index of the sub-carriers.
7. The method of claim 4, wherein the allocation restriction condition of the sub-carriers, the predetermined QoS restriction condition of the UE in the licensed band and the QoS restriction condition of the UE in the unlicensed band, and the predetermined authorized power restriction condition and the predetermined unauthorized power restriction condition are calculated by the following formulas:
wherein, K m Representing a set of user equipments on said sub-carriers that are not interfered by the Wi-Fi system, the constraints (1 a) and (1 b) beingThe method comprises the steps of presetting subcarrier distribution limiting conditions, wherein constraint (1 c) represents the service quality limiting conditions of preset user equipment in an authorized frequency band, constraint (1 d) represents the service quality limiting conditions of the preset user equipment in an unauthorized frequency band, constraint (1 e) represents the preset authorized power limiting conditions, and constraint (1 f) represents the preset unauthorized power limiting conditions,
represents an allocation index for said sub-carrier>
Representing the downlink transmission rate of said user equipment, M representing the set of multiple carrier components, K representing the number of users, N m Representing the set of sub-carriers on the m-th carrier component, N 0 Representing a set of authorized carriers divided into sub-carriers,
an allocation index representing a sub-carrier on an authorized component carrier, in conjunction with a predetermined number of sub-carriers>
Indicates that the user equipment's downlink transmission rate, based on the granted component carrier, is greater than or equal to>
Indicating the transmission power, R, of the user in the licensed component carrier k,min Indicating the lowest rate for the k-th user,
represents the maximum transmission power over the authorized frequency band +>
Represents the maximum transmission power over the unlicensed frequency band, <' > is greater>
Indicating the lowest rate of the kth user in the licensed band.
8. The method of claim 4, wherein the determining the allocation of network resources in the downlink in the LTE-U system according to the allocation restriction condition of the sub-carriers, the preset qos restriction condition of the ue in the licensed frequency band and the qos restriction condition of the ue in the unlicensed frequency band, and the preset authorized power restriction condition and the qos restriction condition of the ue in the unlicensed frequency band comprises:
determining the allocation of authorized resources according to the allocation limitation condition of the subcarriers on the authorized frequency band, the preset service quality limitation condition of the user equipment in the authorized frequency band and the preset authorized frequency band power limitation condition, wherein the method comprises the following steps:
calculating subcarrier distribution indexes according to a relaxation algorithm;
according to the relaxed subcarrier distribution index, reducing the requirements of a preset service quality limiting condition and a preset power limiting condition of the user equipment through a Lagrange dual decomposition algorithm to obtain resource distribution on the authorized carrier component subcarriers;
and adjusting the resource allocation on the authorized carrier wave division sub-carrier according to a preset power allocation limiting condition and a preset sub-carrier wave allocation limiting condition, and determining the allocation of the authorized resource.
9. The method of claim 8, wherein the allocation of the granted resources is determined by the following equation:
wherein, the first and the second end of the pipe are connected with each other,
an assignment index representing a carrier component>
Indicating the transmission power of the user on the licensed component carrier, N 0 Representing a set of authorized carrier-component sub-carriers;
calculating the distribution limiting condition according to the sub-carriers on the authorized frequency band, the preset service quality limiting condition of the user equipment in the authorized frequency band and the preset authorized frequency band power limiting condition according to the following formula:
wherein the content of the first and second substances,
representing the downlink transmission rate of user equipment on said licensed band, K representing the number of users,
indicates that the kth user is at the lowest rate, in the authorized frequency band, is->
Represents a maximum transmission power over a licensed frequency band;
determining the rate of the user equipment on the authorized frequency band according to the result of resource allocation on the authorized frequency band by the following formula:
wherein, the first and the second end of the pipe are connected with each other,
represents an allocation of an optimal subcarrier on an authorized carrier component, based on the number of subcarriers in the grant field, and>
represents an optimal power allocation on an authorized carrier component>
Indicating the channel gain of the user in the licensed band.
10. The method of claim 4, wherein the determining the allocation of network resources in the downlink in the LTE-U system according to the allocation restriction condition of the sub-carriers, the preset qos restriction condition of the ue in the licensed frequency band and the qos restriction condition of the ue in the unlicensed frequency band, and the preset granted power restriction condition and the qos restriction condition of the ue in the unlicensed frequency band comprises:
determining the allocation of the unauthorized resource according to the allocation limiting condition of the sub-carrier on the unauthorized frequency band, the service quality limiting condition of the preset user equipment on the unauthorized frequency band and the power limiting condition of the preset unauthorized frequency band, wherein the method comprises the following steps:
calculating subcarrier distribution indexes according to a relaxation algorithm;
according to the relaxed subcarrier distribution index, reducing the requirements of a preset service quality limiting condition and a preset power limiting condition of the user equipment through a Lagrange dual decomposition algorithm to obtain resource distribution on the unauthorized carrier component subcarrier;
and adjusting the resource allocation on the unauthorized carrier wave division sub-carrier according to a preset power allocation limiting condition and a preset sub-carrier wave allocation limiting condition, and determining the allocation of the unauthorized resource.
11. The method of claim 10, wherein the allocation of the unlicensed resources is determined by the following equation:
wherein, the first and the second end of the pipe are connected with each other,
represents an allocation index of the subcarrier, when m ≠ 0, then ≠ 0>
Then represents the allocation index of the non-carrier component;
calculating the distribution limiting condition according to the sub-carriers on the unlicensed frequency band, the preset service quality limiting condition of the user equipment on the unlicensed frequency band and the preset power limiting condition of the unlicensed frequency band according to the following formula:
wherein the content of the first and second substances,
represents a downlink transmission rate of a user equipment on said unlicensed frequency band, -is>
Distribution index of sub-carriers on unlicensed component carriers, M denotes a set of multiple carrier components, K denotes the number of users, N m Representing the set of sub-carriers, R, on the m-th carrier component k,min Representing the lowest rate of the kth user>
Represents the maximum transmission power in the unlicensed frequency band>
Indicating the rate, K, of the user equipment on the licensed band m Representing the set of users of the m-th carrier component.
12. An apparatus for network resource allocation, the apparatus comprising:
a receiving module, configured to receive a downlink reference signal from a base station;
a calculating module, configured to calculate, according to the downlink reference signal of the base station, a signal-to-interference-plus-noise ratio of different subcarriers of the ue on each carrier component;
a conversion module, configured to convert, according to the signal to interference plus noise ratios of different subcarriers of the ue on each carrier component, to obtain an equivalent signal to interference plus noise ratio of the ue on the carrier component;
a channel quality obtaining module, configured to obtain channel quality of the ue on a carrier component according to an equivalent signal-to-interference-plus-noise ratio of the ue on the carrier component and a preset mapping relationship;
the judging module is used for judging whether the user equipment is interfered by the Wi-Fi system or not according to the channel quality of the user equipment on the carrier component and a preset user equipment classification model;
and the allocation module is used for allocating the network resources used by the user equipment according to whether the user equipment is interfered by the Wi-Fi system.
13. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the network resource allocation method according to any one of claims 1 to 11.
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