CN107071860B - Long Term Evolution (LTE) public safety network access control method and device - Google Patents
Long Term Evolution (LTE) public safety network access control method and device Download PDFInfo
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- CN107071860B CN107071860B CN201710080921.7A CN201710080921A CN107071860B CN 107071860 B CN107071860 B CN 107071860B CN 201710080921 A CN201710080921 A CN 201710080921A CN 107071860 B CN107071860 B CN 107071860B
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Abstract
The embodiment of the invention provides a Long Term Evolution (LTE) public safety network access control method and a device, wherein a first load increment generated to a communication system by a received user call request is determined; correcting the first load increment according to the channel quality of a channel used by the user call request and the current load of the communication system to obtain a second load increment after correcting the first load increment, wherein the lower the channel quality is, the higher the current load of the communication system is, the larger the correction amplitude of the corrected first load increment is, and the larger the corrected second load increment is compared with the first load increment; when the sum of the second load increment and the current load of the communication system is less than or equal to a preset threshold value, accessing a user call request; therefore, the call request with better channel quality can be preferentially accessed, the resource waste caused by the occupation of limited wireless resources by the call request with poorer channel quality is avoided, the utilization rate of the limited wireless resources is improved, and the accommodating capacity of a communication system is improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a Long Term Evolution (LTE) public safety network access control method and device.
Background
A public safety network refers to a communication network for general users or public safety agency personnel to communicate in case of an emergency.
The public safety network based on LTE (Long Term Evolution ) fully utilizes the advantages of LTE technology such as high bandwidth, low delay, full-time online, and the like, and is used for common users or public safety organization personnel on site in case of emergency, for example: firefighters, policemen, doctors, etc. provide reliable communication guarantees. If the reliable communication of safety mechanism personnel can not be ensured, the life and property of people are necessarily damaged.
Since most of the emergency areas are covered by cellular single-cell base stations, the communication complexity of the network is increased, the blocking rate is increased, the service quality of the users is deteriorated, and congestion is caused by a large number of users which are increased rapidly in a short time. Therefore, from the perspective of radio resource management, it is necessary to design a reasonable admission control policy for a public safety network to alleviate the problem of network congestion.
In the prior art, the call request is determined to be accessed or rejected by simply judging whether the load increment generated by the call request to a communication system is larger than a threshold value. However, although the load increment of the call request on the communication system is small, the channel quality of the channel used by the call request is poor, after the call request is accessed, the communication cannot be performed normally, limited wireless resources are occupied, resource waste is caused, and the accommodating capacity of the communication system is reduced on the whole.
Disclosure of Invention
The embodiment of the invention aims to provide a Long Term Evolution (LTE) public safety network admission control method and a device, which correct the load increment brought by a received call request for a communication system according to the channel quality of a channel used by the call request of a user and the current load of the communication system, judge whether to access the call request according to the corrected load increment, can preferentially access the call request with better channel quality, avoid the waste of resources caused by limited wireless resource occupation of the call request with poorer channel quality, and improve the receiving capacity of the communication system on the whole. The specific technical scheme is as follows:
the embodiment of the invention discloses a Long Term Evolution (LTE) public safety network access control method, which comprises the following steps:
determining a first load increment generated by the received user call request to the communication system;
correcting the first load increment according to the channel quality of a channel used by the user call request and the current load of the communication system to obtain a second load increment after correcting the first load increment, wherein the lower the channel quality is, the higher the current load of the communication system is, the larger the correction amplitude of the first load increment is, and the larger the corrected second load increment is compared with the first load increment;
and when the sum of the second load increment and the current load of the communication system is less than or equal to a preset threshold value, accessing the user call request.
Optionally, the determining a first load increment generated to the communication system by the received user call request includes:
when receiving a plurality of user call requests, acquiring a user call request with the highest priority according to the priorities of different user types, wherein the user type is the type of a user sending the user call request;
a first load increment to the communication system generated by the highest priority subscriber call request is determined.
Optionally, the determining a first load increment generated to the communication system by the received user call request includes:
when receiving the user call requests, acquiring load increment generated by the user call requests to a communication system, and taking the load increment corresponding to the user call request with the minimum load increment as a first load increment.
Optionally, the modifying the first load increment according to the channel quality of the channel used by the user call request to obtain a second load increment after the first load increment is modified includes:
obtaining a first parameter according to the channel quality and the current load of the communication system through a first preset formula;
and correcting the first load increment according to the first parameter through a second preset formula to obtain a second load increment after the first load increment is corrected.
Optionally, the first preset formula is as follows:
v ismSaid first parameter, said SIMR, representing said user mmA channel quality indicating a user call request of said user m, said
Represents an average channel quality, said M represents a constant factor, said sigma represents an amplification factor,
wherein, the C1Said C is2For the self-defined parameter, the rho represents the current load of the communication system, and the rho(th)Representing the preset threshold.
The second preset formula is as follows:
Δρ′m＝vmΔρm
the delta rho'mRepresenting the second load increment of user m, the vmThe first parameter, the Δ ρ, representing the user mmRepresenting said first load increment for user m.
The embodiment of the invention also discloses a long term evolution LTE public safety network access control device, which comprises:
a load increment module for determining a first load increment generated by the received user call request to the communication system;
a correction module, configured to correct the first load increment according to channel quality of a channel used by the user call request and a current load of the communication system, to obtain a second load increment obtained by correcting the first load increment, where a lower the channel quality is, a higher a current load of the communication system is, a larger correction amplitude is used to correct the first load increment, and the second load increment is larger than the first load increment;
and the access module is used for accessing the user call request when the sum of the second load increment and the current load of the communication system is less than or equal to a preset threshold value.
Optionally, the load increment module is specifically configured to:
when receiving a plurality of user call requests, acquiring a user call request with the highest priority according to the priorities of different user types, wherein the user type is the type of a user sending the user call request;
a first load increment to the communication system generated by the highest priority subscriber call request is determined.
Optionally, the load increment module is further specifically configured to:
when receiving the user call requests, acquiring load increment generated by the user call requests to a communication system, and taking the load increment corresponding to the user call request with the minimum load increment as a first load increment.
Optionally, the modification module is specifically configured to:
obtaining a first parameter according to the channel quality and the current load of the communication system through a first preset formula;
and correcting the first load increment according to the first parameter through a second preset formula to obtain a second load increment after the first load increment is corrected.
Optionally, the first preset formula in the correction module is:
v ismSaid first parameter, said SIMR, representing said user mmA channel quality indicating a user call request of said user m, said
Represents an average channel quality, said M represents a constant factor, said sigma represents an amplification factor,
whereinSaid C is1Said C is2For the self-defined parameter, the rho represents the current load of the communication system, and the rho(th)Representing the preset threshold;
the second preset formula is as follows:
Δρ′m＝vmΔρm
the delta rho'mRepresenting the second load increment of user m, the vmThe first parameter, the Δ ρ, representing the user mmRepresenting said first load increment for user m.
According to the method and the device for controlling the admission of the LTE public safety network, the load increment generated by the communication system by the call request can be corrected according to the channel quality of the channel used by the call request of the user and the current load of the communication system, and whether the call request is accessed or rejected is judged according to the corrected load increment, so that the call request with better channel quality can be preferentially accessed, the problem that the call request with poorer channel quality occupies limited wireless resources to cause resource waste is avoided, meanwhile, the screening effect of different call requests can be dynamically adjusted according to the current load state of the communication system, the problem of excessive rejection when the load of the communication system is lower is avoided, the utilization rate of the limited wireless resources is improved, and the accommodating capacity of the communication system is integrally improved. Of course, it is not necessary for any product or method of practicing the invention to achieve all of the above-described advantages at the same time.
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 flowchart of an LTE public safety network admission control method according to an embodiment of the present invention;
fig. 2 is a diagram illustrating rejection rate of a communication system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of throughput rates of communication systems with different customized parameters according to an embodiment of the present invention;
fig. 4 is another flowchart of an LTE public safety network admission control method according to an embodiment of the present invention;
fig. 5 is a structural diagram of an LTE public safety network admission control apparatus 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 flowchart of an LTE public safety network admission control method according to an embodiment of the present invention, including:
a first load increment to the communication system resulting from a received user call request is determined, step 101.
The LTE public safety network is a communication system for general users or public safety agency personnel to communicate when an emergency occurs.
The user call request may be a request for accessing the communication system and establishing a communication connection with another user through various communication devices, such as a mobile phone or a satellite phone.
The amount of traffic that can be carried by the communication system is limited, so that when a new user call request is received by the communication system, it is determined how much of the first load increment will be generated for the entire communication system if the user call request is accessed.
Upon accessing the subscriber call request to the communication system, a communication connection is established in the communication system, which communication connection will cause a corresponding load to the overall communication system, the newly added load being the first load increment.
The communication system may calculate a first load increment for a subscriber call request based on the subscriber call request prior to accessing the subscriber call request. Specifically, the method for calculating the first load increment belongs to the prior art, and is not described herein again.
The channel refers to a physical channel for transmitting information when a user communicates, and in the embodiment of the present invention, the channel refers to a radio channel using a radiation radio wave as a transmission mode, and a channel model adopts a rayleigh fading model.
The channel quality of a channel is used to indicate the goodness of the channel used for communication, and is determined by the signal-to-noise ratio of the channel.
The Channel Quality may be represented by a CQI (Channel Quality Indicator), which represents whether the current Channel Quality is good or bad, and corresponds to a signal-to-Noise Ratio (SINR), which is a Ratio of the strength of the received useful signal to the strength of the received Interference signal.
Specifically, the method for obtaining the channel quality belongs to the prior art, and an appropriate method can be selected from the prior art as needed to obtain the channel quality.
For example: the base-to-terminal SINR value may be expressed as:
wherein, PNoise(s)Representing the noise power, P, measured by the terminalInterferenceThe power of the interference signal measured by the terminal is represented, and P represents the received power of the useful signal transmitted by the target base station measured by the terminal, and can be calculated by the following formula.
If the link channel model between the base station and the terminal adopts a rayleigh fading model, the terminal measures the received power of the useful signal transmitted by the target base station as follows:
a denotes a shadow fading and an antenna gain, d denotes a distance of a transceiving end, α denotes a path loss exponent,
indicating small-size rayleigh fading.
The obtained first load increment may be corrected by the channel quality of the channel and the current load of the communication system. The current load of the communication system refers to the sum of various loads existing in the current communication system, and can reflect the congestion degree of the current communication system, and the higher the current load of the communication system is, the higher the congestion degree in the communication system is.
In practical application, in order to avoid waste of wireless communication resources caused by accessing a call request with poor channel quality as much as possible under the condition that the total load of a communication system is already high, when the channel quality is lower, the correction amplitude of the first load increment is larger, so that the corrected second load increment is larger than the original first load increment, and the second load increment is used for judging whether to access the user call request, so that the user call request with poor channel quality can be avoided from being accessed under the condition that the total load of the communication system is already high to a great extent.
Specifically, there are many ways to modify the first load increment according to the channel quality, for example, the first load increment may be calculated by the channel quality or an adjusted coefficient obtained according to the channel quality, so as to obtain the second load increment.
Referring to table 1, table 1 is a comparison table of the adjustment coefficient and the channel quality. When CQI is used to represent channel quality, a corresponding adjustment coefficient may be obtained according to table 1, and the first load increment is multiplied by the adjustment coefficient, so that a modified second load increment may be obtained.
TABLE 1
| Channel Quality (CQI) | ≥20 | 15～20 | 10～15 | ≤10 |
| |
1 | 1.2 | 1.5 | 2 |
It should be noted that each parameter in table 1 is only an optional parameter range, and may be set as required in practical applications.
And 103, accessing the user call request when the sum of the second load increment and the current load of the communication system is less than or equal to a preset threshold value.
The current load of the communication system refers to the total load of the communication system existing at present, and can be obtained by monitoring the communication system in real time.
The preset threshold may be a total load threshold of the communication system, and may be set as needed.
And after the second load increment is obtained, adding and summing the second load increment of the user call request and the current load of the communication system, and when the sum of the second load increment and the current load of the communication system is less than or equal to a preset threshold, considering that the channel quality of a channel adopted by the user call request is better, and the load increment generated by the system is smaller, so that the user call request can be accessed.
When the sum of the second load increment and the current load of the communication system is greater than the preset threshold, the load increment of the user call request to the communication system is considered to be overlarge, under the current load condition of the communication system, if the user call request is accessed, the waste of wireless resources is caused to the total communication system, so that other large number of user call requests cannot be accessed to the communication system in time, the rejection rate of the communication system is increased on the whole, and the communication system is blocked. Therefore, the user call request needs to be rejected, or the user call request is transferred to a waiting queue, and when the load of the communication system is reduced and the sum of the second load increment and the reduced load of the communication system is less than or equal to a preset threshold value, the user call request is accessed again.
The judgment process can be expressed by the following formula:
Δρ′m+ρ≤ρ(th)
wherein m represents a user, Δ ρ'mRepresenting a second load increment of the user m, p representing a current load already existing in the current communication system, p(th)Representing a preset threshold.
In the embodiment of the invention, the first load increment is corrected according to the channel quality of the channel used by the user call request and the current load of the communication system, and whether the user call request is accessed or rejected is judged according to the sum of the corrected second load increment and the current load of the current communication system, so that the call request with better channel quality can be preferentially accessed when the load of the communication system is higher, the problem that the call request with poorer channel quality occupies limited wireless resources to cause resource waste is avoided, meanwhile, the screening effect of different call requests can be dynamically adjusted according to the current load state of the communication system, the problem of excessive rejection when the load of the communication system is lower is avoided, the utilization rate of the limited wireless resources is improved, and the accommodating capacity of the communication system is integrally improved. And because whether the user call request is accessed or rejected is judged by the sum of the second load increment and the current load of the current communication system, the access control criterion which aims at minimizing the system load is realized, the utilization degree of wireless resources can be further reduced, and the system admission capacity is improved. The embodiment of the invention more reasonably utilizes the limited wireless resources and improves the system admission capacity on the whole, thereby reducing the rejection rate of the communication system on the whole and enabling more users to establish communication through the communication system. Referring to fig. 2, fig. 2 is a schematic diagram of rejection rate of the communication system according to the embodiment of the present invention. Communication of multiple services, such as communication of audio, communication of video, and communication of data, may be performed simultaneously in a communication system.
In fig. 2, a curve 211 is a rejection rate of a communication system that does not use the method provided by the embodiment of the present invention when data is communicated, and a curve 212 is a rejection rate of a communication system that uses the method provided by the embodiment of the present invention when data is communicated.
A curve 231 is a rejection rate of the communication system without using the method provided by the embodiment of the present invention when video communication is performed, and a curve 232 is a rejection rate of the communication system with using the method provided by the embodiment of the present invention when video communication is performed.
As can be seen from the figure, by applying the LTE public safety network admission control method provided by the embodiment of the present invention, when the number of users is high, the rejection rate of the communication system can be significantly reduced in each service type.
Optionally, in the method for controlling admission to an LTE public safety network according to the embodiment of the present invention, determining a first load increment generated by a received user call request to a communication system includes:
the method comprises the steps of firstly, when a plurality of user call requests are received, obtaining a user call request with the highest priority according to the priorities of different user types, wherein the user type is the type of a user sending the user call request.
In the communication system of the Long Term Evolution (LTE) public safety network, users can be ordinary users or public safety agency personnel, wherein the ordinary users can also belong to users in an area where an emergency happens and users outside the area where the emergency happens, and the users can be determined through the position of a base station providing communication service for the users. Therefore, users in a communication system can be classified into various types. Different types of customers may have different priority levels, for example, the priority level of public safety agency personnel may be higher and the priority of users outside the area where the emergency occurs may be lower.
When a plurality of user call requests are received, the user call request with the highest priority can be preferentially acquired according to the priority of the user type.
Specifically, different priorities are assigned to different client types, which belongs to the prior art and is not described herein again.
In a second step, a first load increment to the communication system for the highest priority subscriber call request is determined.
After the user call request with the highest priority is obtained, corresponding calculation can be performed on the user call request to obtain a first load increment of the user call request, and subsequent steps are performed.
In the embodiment of the invention, when a plurality of user call requests are received, the user call request with the highest priority is determined according to the priorities of different user types, and then the first load increment of the user call request is obtained, so that the user call request of an important user with higher priority can be preferentially accessed, and the reliable communication of the important user is ensured when an emergency occurs.
Optionally, in the method for controlling admission to an LTE public safety network according to the embodiment of the present invention, determining a first load increment generated by a received user call request to a communication system includes:
when receiving a plurality of user call requests under the same priority, acquiring load increment generated by the user call requests to a communication system, and taking the load increment corresponding to the user call request with the minimum load increment as a first load increment.
When a plurality of user call requests are received simultaneously, the load increment generated to the communication system by each user call request can be obtained. Then, the user call request with the minimum load increment is selected from the load increments corresponding to each user call request, and the load increment of the user call request is used as a first load increment to carry out the subsequent steps.
The formula can be used:
to represent the user call request with the minimum selected load increment, wherein m represents the user call request, since one user corresponds to one user call request, m can also represent the users at the same time, k represents the total user call request or the number of the users, and Δ ρmRepresenting the incremental load caused by the call request made by subscriber m.
When a plurality of user call requests are received, firstly, the load increment of each user call request is screened once, and the user call request with the minimum load increment is selected. And the load increment of the user call request is used as the first load increment to carry out the subsequent steps, so that the user call request with the minimum load increment can be accessed preferentially, and the accommodating capacity of the communication system is further reduced on the whole.
Optionally, in the method for controlling admission to an LTE public safety network according to the embodiment of the present invention, the modifying a first load increment according to a channel quality of a channel used by a user call request and a current load of a communication system to obtain a second load increment after the modifying of the first load increment includes:
first, a first parameter is obtained according to the channel quality and the current load of the communication system through a first preset formula.
When the first load increment is corrected according to the channel quality, a first parameter may be obtained through a preset first formula according to the channel quality and the current load of the communication system, where the first parameter is an adjustment coefficient used to correct the first load increment.
The channel quality may be specifically quantized and expressed using specific values. The first predetermined formula describes the first parameter as a function of the value of the channel quality and the current load of the communication system. Generally, when the channel quality is lower and the current load of the communication system is higher, the value of the first parameter may be made larger, so that the first load increment may be conveniently amplified through the first parameter, so that the obtained first parameter may more accurately reflect the situation of the channel quality being poor, and the user call request may be more difficult to access.
Specifically, the first preset formula may select an existing function or construct a function as needed according to the above-mentioned channel quality value and the corresponding relationship between the current load of the communication system and the first parameter, for example, the first preset formula may be a logarithmic function or some power function, and these function forms may all satisfy that when the channel quality value, the first parameter and the current load of the communication system are used as function variables, the smaller the channel quality value is, the larger the first parameter is.
And secondly, correcting the first load increment according to the first parameter through a second preset formula to obtain a second load increment after the first load increment is corrected.
The second predetermined formula is used to modify the first load increment using the first parameter. In practice, the first load increment is typically amplified using a first parameter. Therefore, the second preset formula can correct the first load increment according to the first parameter in an addition operation, a multiplication operation, an exponential operation or the like.
In the embodiment of the invention, a first parameter is obtained according to the channel quality through a first preset formula, and the first load increment is corrected according to the first parameter through a second preset formula to obtain a second load increment. Through the use of the first preset formula and the second preset formula, the correction of the first load increment according to the channel quality is more accurate and clear, and further, a reliable basis can be provided for judging whether to access or reject the user call request.
Optionally, in the LTE public safety network admission control method provided in the embodiment of the present invention, when SINR is used to represent channel quality, the first preset formula may be:
vmfirst parameter, SINR, representing user mmIndicating the channel quality of the user call request of user m,
denotes an average channel quality, M denotes a constant factor, σ denotes an amplification factor,
wherein, C1，C2For the custom parameters, ρ represents the current load already existing in the communication system, ρ(th)Representing a preset threshold.
SINR (Signal to interference plus noise ratio) with different channel qualities according to different users or user call requestsmThe first parameter v can be dynamically adjustedmTherefore, the user with good channel quality is selected to access the network. The constant factor M is used to ensure SINRm+ M > 0. SINR if new bearermThe value is greater than or equal to the average of the users already present in the system
Value, then v m1 is ═ 1; otherwise, v needs to be recalculatedm. The worse the channel quality of the channel used by the user or user call request m, the SINRmThe smaller the value, vmThe larger the value. Greater vmThis means a more conservative access criterion, the harder it is for the user to access the call request.
The amplification factor σ in the above formula functions to dynamically adjust v based on the current load of the communication systemmSize. When the system load degree is low, the current system load rho is smaller than a preset threshold rho(th)Half of and therefore a small value, for the first parameter vmThe amplification effect of (a) is also small. So that the first parameter v is nowmThe magnitude of the correction for the first load increment is less effective and avoids the problem of excessive rejection when the network load is low.
As the load level of the communication system increases, the congestion worsens, the value of σ increases exponentially, for the first parameter vmHaving a significant methodological effect, so that the first parameter vmThe magnitude of the correction to the first load increment is greatly increased, making it more difficult for a user with poor channel quality to call to request access to the network.
At this time, because the communication system has a high load degree and is seriously congested, although the user call request with poor channel quality is rejected, the communication system can be ensured to always access the user with good channel quality in a short time, thereby reducing the risk of wasting wireless resources. And the utilization rate of system spectrum resources is improved generally.
C1，C2When different values are selected as the customized parameters, the overall throughput of the communication system can be adjusted. Referring to fig. 3, fig. 3 is a schematic diagram of throughput rates of communication systems under different customized parameters according to an embodiment of the present invention. The reference curve is the throughput rate of the communication system when the admission control method provided by the embodiment of the invention is not used.
As can be seen from the figure, when C1＝10，C2When 3, the total throughput of the communication system is high, and C may be set to C1＝10，C2As a preferred value, 3.
In the embodiment of the present invention, the second preset formula is:
Δρ′m＝vmΔρm
Δρ′ma second load increment, v, representing user mmA first parameter, Δ ρ, representing user mmRepresenting a first load increment for user m.
And after the first parameter is obtained through the first preset formula, the first load is corrected through the second preset formula to obtain a second load increment.
In the exemplary embodiment of the invention, the first parameter v is determined by the amplification factor σmOn the premise of fully considering the channel quality of the channel used by the user call request, the current load condition of the communication system which is fully considered can dynamically adjust the first parameter according to the current load of the communication system, so that the user call request with poor channel quality can be accessed when the load of the communication system is low, and the user call request with poor channel quality is rejected when the load of the communication system is high, thereby further increasing the use efficiency and the total bearing capacity of the communication system.
Referring to fig. 4, fig. 4 is another flowchart of an LTE public safety network admission control method according to an embodiment of the present invention, including:
In step 403, it is determined whether the channel quality requested by the user call is greater than or equal to the average channel quality of the existing users in the communication system. Is determined promptly
Determining a first parameter vm。
In step 406, it is determined whether the sum of the second load increment and the current load of the communication system is less than or equal to a preset threshold. The second load increment is modified by the first parameter, which may be denoted as vmΔρm. The current load of the communication system may be denoted as p and the preset threshold may be denoted as p(th). That is, it is necessary to judge ρ + vmΔρm≤ρ(th)。
In step 407, when the sum of the second load increment and the current load of the communication system is less than or equal to the preset threshold, the user call request is accessed.
And step 408, rejecting the user call request when the sum of the second load increment and the current load of the communication system is larger than a preset threshold value.
Referring to fig. 5, fig. 5 is a structural diagram of an LTE public safety network admission control apparatus according to an embodiment of the present invention, including:
a load increment module 501 is configured to determine a first load increment that a received user call request generates to the communication system.
A modification module 502, configured to modify the first load increment according to a channel quality of a channel used by the user call request and a current load of the communication system, to obtain a second load increment after the first load increment is modified, where the lower the channel quality, the higher the current load of the communication system is, the larger a modification amplitude of the first load increment is modified, and the larger the second load increment is compared with the first load increment.
An accessing module 503, configured to access the user call request when a sum of the second load increment and the current load of the communication system is smaller than or equal to a preset threshold.
In the embodiment of the invention, the first load increment is corrected according to the channel quality of the channel used by the user call request and the current load of the communication system, and whether the user call request is accessed or rejected is judged according to the sum of the corrected second load increment and the current load of the current communication system, so that the call request with better channel quality can be preferentially accessed when the load of the communication system is higher, the resource waste caused by limited wireless resource occupation of the call request with poorer channel quality is avoided, meanwhile, the screening effect of different call requests can be dynamically adjusted according to the current load state of the communication system, the problem of excessive rejection when the load degree of the communication system is lower is avoided, the utilization rate of the limited wireless resource is improved, and the accommodating capacity of the communication system is integrally improved. And because whether the user call request is accessed or rejected is judged by the sum of the second load increment and the current load of the current communication system, the access control criterion which aims at minimizing the system load is realized, the utilization degree of wireless resources can be further reduced, and the system admission capacity is improved. The embodiment of the invention more reasonably utilizes the limited wireless resources and improves the system admission capacity on the whole, thereby reducing the rejection rate of the communication system on the whole and enabling more users to establish communication through the communication system.
The device of the embodiment of the invention is a device applying the LTE public safety network access control method, so that all the embodiments of the LTE public safety network access control method are suitable for the device and can achieve the same or similar beneficial effects.
Optionally, in the LTE public safety network admission control apparatus provided in the embodiment of the present invention, the load increment module 501 is specifically configured to:
when a plurality of user call requests are received, the user call request with the highest priority is obtained according to the priorities of different user types, wherein the user type is the type of the user sending the user call request.
A first load increment to the communication system generated by the highest priority subscriber call request is determined.
Optionally, in the LTE public safety network admission control apparatus provided in the embodiment of the present invention, the load increment module 501 is further specifically configured to:
when receiving the user call requests, acquiring load increment generated by the user call requests to a communication system, and taking the load increment corresponding to the user call request with the minimum load increment as a first load increment.
Optionally, in the LTE public safety network admission control apparatus provided in the embodiment of the present invention, the modifying module 502 is specifically configured to:
and obtaining a first parameter according to the channel quality and the current load of the communication system through a first preset formula.
And correcting the first load increment according to the first parameter through a second preset formula to obtain a second load increment after the first load increment is corrected.
Optionally, in the LTE public safety network admission control apparatus provided in the embodiment of the present invention, the first preset formula in the modification module 502 is:
v ismSaid first parameter, said SIMR, representing said user mmA channel quality indicating a user call request of said user m, said
Represents an average channel quality, said M represents a constant factor, said sigma represents an amplification factor,
wherein, the C1Said C is2For the self-defined parameter, the rho represents the current load of the communication system, and the rho(th)Representing the preset threshold.
The second preset formula is as follows:
Δρ′m＝vmΔρm
the delta rho'mRepresenting the second load increment of user m, the vmThe first parameter, the Δ ρ, representing the user mmRepresenting said first load increment for user m.
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, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
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 (6)
1. A Long Term Evolution (LTE) public safety network admission control method is characterized by comprising the following steps:
determining a first load increment generated by the received user call request to the communication system;
correcting the first load increment according to the channel quality of a channel used by the user call request and the current load of the communication system to obtain a second load increment after correcting the first load increment, wherein the lower the channel quality is, the higher the current load of the communication system is, the larger the correction amplitude of the first load increment is, and the larger the corrected second load increment is compared with the first load increment;
when the sum of the second load increment and the current load of the communication system is less than or equal to a preset threshold value, accessing the user call request;
the modifying the first load increment according to the channel quality of the channel used by the user call request and the current load of the communication system to obtain a second load increment after the first load increment is modified, includes:
obtaining a first parameter according to the channel quality and the current load of the communication system through a first preset formula;
correcting the first load increment according to the first parameter through a second preset formula to obtain a second load increment after the first load increment is corrected;
the first preset formula is as follows:
v ismSaid first parameter, said SIMR, representing said user mmA message representing the user's call request of said user mQuality of the road, said
Represents an average channel quality, said M represents a constant factor, said sigma represents an amplification factor,
wherein, the C1Said C is2For the self-defined parameter, the rho represents the current load of the communication system, and the rho(th)Representing the preset threshold;
the second preset formula is as follows:
Δρ′m＝vmΔρm
the delta rho'mRepresenting the second load increment of user m, the vmThe first parameter, the Δ ρ, representing the user mmRepresenting said first load increment for user m.
2. The method of claim 1, wherein determining the first load increment to be applied to the communication system by the received user call request comprises:
when receiving a plurality of user call requests, acquiring a user call request with the highest priority according to the priorities of different user types, wherein the user type is the type of a user sending the user call request;
a first load increment to the communication system generated by the highest priority subscriber call request is determined.
3. The method of claim 1, wherein determining the first load increment to be applied to the communication system by the received user call request comprises:
when receiving the user call requests, acquiring load increment generated by the user call requests to a communication system, and taking the load increment corresponding to the user call request with the minimum load increment as a first load increment.
4. A Long Term Evolution (LTE) public safety network admission control device is characterized by comprising:
a load increment module for determining a first load increment generated by the received user call request to the communication system;
a correction module, configured to correct the first load increment according to a channel quality of a channel used by the user call request and a current load of the communication system, to obtain a second load increment obtained by correcting the first load increment, where a lower channel quality is, a higher current load of the communication system is, a larger correction amplitude is used to correct the first load increment, and the second load increment is larger than the first load increment;
the access module is used for accessing the user call request when the sum of the second load increment and the current load of the communication system is less than or equal to a preset threshold value;
the correction module is specifically configured to obtain a first parameter according to the channel quality and the current load of the communication system through a first preset formula; correcting the first load increment according to the first parameter through a second preset formula to obtain a second load increment after the first load increment is corrected;
the first preset formula in the correction module is as follows:
v ismSaid first parameter, said SIMR, representing said user mmA channel quality indicating a user call request of said user m, said
Represents an average channel quality, said M represents a constant factor, said sigma represents an amplification factor,
wherein, the C1Said C is2For the self-defined parameter, the rho represents the current load of the communication system, and the rho(th)Representing the preset threshold;
the second preset formula is as follows:
Δρ′m＝vmΔρm
the delta rho'mRepresenting the second load increment of user m, the vmThe first parameter, the Δ ρ, representing the user mmRepresenting said first load increment for user m.
5. The apparatus of claim 4, wherein the load increment module is specifically configured to:
when receiving a plurality of user call requests, acquiring a user call request with the highest priority according to the priorities of different user types, wherein the user type is the type of a user sending the user call request;
a first load increment to the communication system generated by the highest priority subscriber call request is determined.
6. The apparatus of claim 4, wherein the load increment module is further specifically configured to:
when receiving the user call requests, acquiring load increment generated by the user call requests to a communication system, and taking the load increment corresponding to the user call request with the minimum load increment as a first load increment.
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| CN102438318A (en) * | 2011-12-30 | 2012-05-02 | 华为技术有限公司 | Method, equipment and system for adjusting feedback cycle of channel quality indicator (CQI) |
| CN103442406A (en) * | 2013-08-30 | 2013-12-11 | 京信通信***（中国）有限公司 | Access control method and device |
| CN104394555A (en) * | 2014-12-12 | 2015-03-04 | 重庆邮电大学 | Load-sensing-based dynamic interference management method for heterogeneous network |
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| CN102438318A (en) * | 2011-12-30 | 2012-05-02 | 华为技术有限公司 | Method, equipment and system for adjusting feedback cycle of channel quality indicator (CQI) |
| CN103442406A (en) * | 2013-08-30 | 2013-12-11 | 京信通信***（中国）有限公司 | Access control method and device |
| CN104394555A (en) * | 2014-12-12 | 2015-03-04 | 重庆邮电大学 | Load-sensing-based dynamic interference management method for heterogeneous network |
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