CN101778431A - Admission control method for user access in base station system and device thereof - Google Patents
Admission control method for user access in base station system and device thereof Download PDFInfo
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Abstract
The invention relates to an admission control method for user access in a base station system, comprising the following steps that: when receiving a service request of quality of service (QOS) of a user, the base station system acquires the current maximum available wireless bandwidth of a base station system in real time, acquires the current wireless bandwidth of the current distributed service flow of the base station system and obtains the current residual wireless bandwidth; and the base station system combines the QOS service flow grade of the user accessed into the base station system and the QOS service flow grade of the user of the current request according to the residual wireless bandwidth to carry out admission judgment on the QOS service flow of the user request. Correspondingly, the invention also provides an admission control device for user access in the base station system. The device comprises a service request receiving module, a residual wireless bandwidth acquiring module and an admission judging module. The method and the device determine whether the service flow is admitted by acquiring real-time wireless bandwidth information so as to ensure to provide the needed QOS service.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to an admission control method and an admission control device for user access in a base station system.
Background
In the period after the wireless communication technology has been developed into the third Generation mobile communication technology (3rd-Generation, 3G), voice service and low-speed data service in the period of the second Generation mobile communication technology (2nd Generation, 2G) have been developed into wireless broadband data service.
The Service contents that the 3G can provide to users are more and more extensive, including common user upload and download services, Quality of Service (QOS) services based on Internet Protocol (IP) carried audio and Video (e.g., Video Telephone (VT), Voice Over IP (VOIP) services), and QCHAT multicast services. If these services are implemented, the base station system should be able to provide the required bandwidth for these services and guarantee the quality of service of these services.
When providing access service for users with various types of services, a good base station system not only can provide the users with access service with QoS requirement and non-QoS access service, but also can not cause reduction of use experience of existing users in the base station system, can not reduce QOS level of the existing users in the base station system, and simultaneously enables access capability of the base station system to be as high as possible, thereby obtaining high investment income ratio for equipment operators. Currently, in order to meet the above requirement, a commonly adopted method is to perform resource admission control on the wireless bandwidth requested by the calling user. Several methods of resource admission control are proposed in the patent literature related to the already disclosed resource admission control.
In one of the conservative resource admission control methods, a base station system reserves a maximum bandwidth required by a service flow for each service flow requested by a user, and the reserved maximum bandwidth is maintained until the service period of the service flow is finished; and meanwhile, the maximum available bandwidth threshold of the base station system is set. When the total bandwidth of the maximum bandwidth reserved for all the service flows exceeds the maximum available bandwidth threshold of the base station system, the base station system directly rejects the admission request of the new service flow. The method has two problems, one is that the maximum bandwidth is reserved for the requested service flow, and the access capacity of a QOS user of a base station system is reduced; secondly, the method does not consider that the wireless bandwidth of the base station system is dynamically changed, even if the maximum bandwidth is reserved for all the service flows, the service quality of a QOS user which has access to the system can not be ensured under the condition that the quality of the wireless signal is deteriorated, and the use experience of the user is also influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an admission control method and device for user access in a base station system, thereby overcoming the problem of low access capacity of QOS users.
Patent documents on the application date of 2009, 24.4.78, application No. CN200910098058.3, publication No. CN101534528A, entitled "one call admission control method", disclose a call admission control method. In the method, admission probability is introduced to judge whether to access a new user according to the occupation condition of admission control resources, and a wireless bandwidth threshold of a base station system and the total bandwidth which can be allocated to the user by the base station system are preset. However, due to the time-varying characteristic of the wireless signal quality, the method does not fully consider that in the base station system, the actual maximum available wireless bandwidth of the base station system also changes dynamically, and how to acquire the dynamic wireless bandwidth of the system in real time is not described.
The present invention solves the above mentioned three problems in the conservative admission control method and CN 200910098058.3: the QOS user has low access capacity; 2. the fixed wireless bandwidth threshold is set, and how to improve the wireless bandwidth utilization rate of the system as much as possible under the condition of ensuring the QOS of the accessed user when the actual wireless bandwidth changes along with the change of the wireless signal quality is not considered. 3. Admission control for forward and reverse access traffic flows, respectively, is not considered.
In order to solve the above problem, the present invention provides an admission control method for user access in a base station system, which comprises:
when a base station system receives a user quality of service (QOS) service request, acquiring the current maximum available wireless bandwidth of the base station system in real time, and acquiring the wireless bandwidth of the current QOS service flow allocated to the base station system to obtain the current residual wireless bandwidth;
and the base station system performs admission judgment on the QOS service flow requested by the user according to the residual wireless bandwidth by combining the QOS service flow grade of the user accessed into the base station system and the QOS service flow grade of the user requested currently.
Further, the method also has the following characteristics:
the new QOS service flow requested by the user is a forward QOS service flow and/or a reverse QOS service flow; the current maximum available wireless bandwidth comprises a forward maximum available wireless bandwidth (MaxBWf) and/or a reverse maximum available wireless bandwidth (MaxBWr); the wireless bandwidth of the allocated QOS traffic flow includes allocated forward QOS traffic flow bandwidth (allocated bwf) and/or allocated reverse QOS traffic flow bandwidth (allocated bwr);
when the base station system receives a new QOS service request of a user, a forward identification and/or a reverse identification in the QOS service request are/is obtained;
and the base station system respectively carries out admission judgment on the forward QOS service flow and the reverse QOS service flow requested by a user according to the residual forward wireless bandwidth and the residual reverse wireless bandwidth.
Further, the method also has the following characteristics:
the specific steps of the base station system acquiring the current maximum available wireless bandwidth of the base station system in real time are as follows:
the base station system periodically collects and stores the maximum available wireless bandwidth calculation parameters; when the base station system acquires the current maximum available bandwidth of the base station system in real time, directly reading the stored maximum available wireless bandwidth calculation parameters, and calculating to obtain the maximum available wireless bandwidth; or,
the base station system periodically collects the maximum available wireless bandwidth calculation parameters, calculates and stores the maximum available wireless bandwidth; and when the base station system acquires the current maximum available bandwidth of the base station system in real time, directly reading the stored maximum available wireless bandwidth.
Further, the method also has the following characteristics:
when the user initiates the QOS service request, providing more than one group of QOS parameters, sequencing according to the priority of the QOS parameters, wherein the QOS parameters are arranged in the front to be optimal and then to be suboptimal; when the base station system receives a QOS forward service request of a user, carrying out admission control judgment according to an optimal group of QOS parameters requested by the user;
the admission judgment of the QOS service flow requested by the user specifically comprises the following steps:
judging whether the current residual wireless bandwidth resource is larger than or equal to the QOS service flow bandwidth requested by the user:
if the current residual wireless bandwidth of the base station system is more than or equal to the QOS service flow bandwidth requested by the user, directly admitting the QOS service flow requested by the user;
if the current residual wireless bandwidth of the base station system is smaller than the QOS service flow bandwidth requested by the user, the other set of sub-optimal QOS parameters provided by the user is continuously obtained to continuously carry out admission judgment.
Further, the method also has the following characteristics:
if the current residual wireless bandwidth of the base station system is smaller than the QOS service flow bandwidth requested in all QOS parameters provided by the user;
the base station system judges whether the requested user forward QOS service flow can be accepted by reducing the QOS service flow grade of the user who has accessed the base station system;
if yes, reducing at least one QOS service flow grade in the accessed system, and admitting the user forward QOS service flow;
otherwise, refusing to admit the QOS service flow requested by the user.
Further, the method also has the following characteristics:
after the base station system acquires the maximum available wireless bandwidth and the wireless bandwidth of the currently allocated QOS service flow, whether the maximum available wireless bandwidth is smaller than the wireless bandwidth of the currently allocated QOS service flow is judged;
and if the maximum available wireless bandwidth is not less than the wireless bandwidth of the currently allocated QOS service flow, the base station system reduces at least one accessed QOS service level until the maximum available wireless bandwidth acquired by the base station system in real time is more than or equal to the wireless bandwidth of the currently allocated QOS service flow.
Further, the method also has the following characteristics:
the reducing of the at least one QOS service level is specifically that the base station system properly reduces the scheduling priority of at least one service flow within the range allowed by the QOS service level according to the currently allocated QOS wireless bandwidth.
In order to solve the above problem, the present invention further provides an admission control device for user access in a base station system, where the device includes a service request receiving module, a remaining wireless bandwidth obtaining module, and an admission decision module:
the service request receiving module is used for receiving a user quality of service (QOS) service request, indicating the residual wireless bandwidth obtaining module and sending the QOS service flow grade requested by the user to the admission judging module;
the remaining wireless bandwidth acquiring module is used for acquiring the current maximum available wireless bandwidth of the base station system in real time after receiving the indication of the service request receiving module, acquiring the wireless bandwidth of the current QOS service flow allocated to the base station system, acquiring the current remaining wireless bandwidth and sending the current remaining wireless bandwidth to the admission judging module;
and the admission judgment module is used for acquiring the QOS service flow grade of the user accessed into the base station system and carrying out admission judgment on the QOS service flow requested by the user according to the residual wireless bandwidth by combining the QOS service flow grade of the user accessed into the base station system and the QOS service flow grade of the user requested currently.
Further, the device also has the following characteristics:
the device also comprises an acquisition module and a storage module;
the acquisition module is used for periodically acquiring the maximum available wireless bandwidth calculation parameters; obtaining the maximum available wireless bandwidth according to the maximum available wireless bandwidth calculation parameter, and sending the maximum available wireless bandwidth to the storage module, or directly sending the maximum available wireless bandwidth calculation parameter to the storage module;
the storage module is used for storing the maximum available wireless bandwidth or the maximum available wireless bandwidth calculation parameter sent by the acquisition module;
when the residual wireless bandwidth acquisition module acquires the current maximum available wireless bandwidth of the base station system in real time, the residual wireless bandwidth acquisition module directly reads the maximum available wireless bandwidth calculation parameters in the storage module and calculates to obtain the maximum available wireless bandwidth; or, directly reading the maximum available wireless bandwidth in the storage module.
Further, the device also has the following characteristics:
the apparatus also includes a downgrade module;
the acquisition module further sends the maximum available wireless bandwidth or the maximum available wireless bandwidth calculation parameter to the degradation judgment module;
the judging module is used for judging whether the maximum available wireless bandwidth is smaller than the wireless bandwidth of the QOS service flow which is distributed currently when the maximum available wireless bandwidth is obtained or the maximum available wireless bandwidth is obtained according to the maximum available wireless bandwidth calculation parameter and the wireless bandwidth of the QOS service flow which is distributed currently by the base station system is obtained; and if the maximum available wireless bandwidth is smaller than the wireless bandwidth of the currently allocated QOS service flow, the degradation module reduces at least one accessed QOS service level until the maximum available wireless bandwidth is larger than or equal to the wireless bandwidth of the currently allocated QOS service flow.
By adopting the method and the device, when a new QOS service flow of a user is accessed, real-time forward wireless bandwidth information and reverse wireless bandwidth information are acquired instead of the pre-configured bandwidth to determine whether to admit the service flow and which priority QOS service flow of the service flow, so that the required QOS service can be provided after the service flow is accessed. In another embodiment, the QOS traffic flow capacity of the system is maximized within an acceptable range for the QOS user. In another embodiment, the method also provides how to guarantee the use feeling of the QOS user who has accessed the system under the condition of the real-time change of the forward and reverse wireless bandwidth of the system caused by the real-time change of the wireless signal.
Drawings
Fig. 1 is an admission control process of a base station system according to an embodiment of the present invention;
fig. 2 is an admission judgment process of a base station system when a user forward QOS service flow is accessed according to an embodiment of the present invention;
fig. 3 is a process of a base station system adjusting QOS user traffic priority when the quality of a wireless signal changes;
fig. 4 is a schematic view of an admission control device according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not limited to the present invention.
The invention provides a method for judging whether to accept a new service flow by a base station system, which comprises the steps of obtaining the real-time forward wireless bandwidth residual condition and/or reverse wireless resource residual condition by the base station system when the base station system receives the new service flow request of a user, and comprehensively considering the QOS service flow grade of the user accessed into the base station system and the QOS service flow grade of the user requested currently.
In addition, the invention also considers that under the condition of changing the quality of the wireless signal, the priority of the forward service flow and/or the reverse service flow of the QOS service flow of the user which has accessed the system is adjusted, so that under the condition of deteriorating the quality of the wireless signal, the access service meeting the QOS requirement can still be provided for the service flow of the user which has the QOS requirement and accessed into the base station system.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In this embodiment, after receiving a new QOS service flow request from a user, a base station system obtains a current maximum available wireless bandwidth of the base station system in real time, obtains a wireless bandwidth of a QOS service flow currently allocated to the base station system, obtains a current remaining wireless bandwidth, and performs admission judgment on the new service flow requested by the user according to the remaining wireless bandwidth in combination with a QOS service flow class of the user already accessed to the base station system and a QOS service flow class of the user currently requested.
Wherein, the new QOS service flow requested by the user can be a forward QOS service flow and/or a reverse QOS service flow; the wireless bandwidth may be a forward wireless bandwidth and/or a reverse wireless bandwidth, and thus the current maximum available wireless bandwidth includes a forward maximum available wireless bandwidth MaxBWf and/or a reverse maximum available wireless bandwidth MaxBWr; the wireless bandwidth of the allocated QOS traffic flow comprises allocated forward QOS traffic flow bandwidth AllocatedBWf and/or allocated reverse QOS traffic flow bandwidth AllocatedBWr;
and the base station system respectively carries out admission judgment on the forward QOS service flow and the reverse QOS service flow requested by the user according to the residual forward wireless bandwidth and the residual reverse wireless bandwidth.
As shown in fig. 1, the method specifically comprises the following steps:
step 10, a base station system receives a new QOS service flow request of a user;
step 11, the base station system acquires the current maximum available wireless bandwidth of the base station system in real time, and acquires the current allocated QOS wireless bandwidth to obtain the current remaining maximum wireless bandwidth;
preferably, the base station system obtaining the current maximum available wireless bandwidth of the base station system in real time can be implemented by the following method:
the base station system periodically collects and stores the maximum available wireless bandwidth information; when the base station system acquires the maximum available bandwidth of the current base station system in real time, the base station system directly reads the stored maximum available wireless bandwidth information to acquire the maximum available wireless bandwidth, so that real-time acquisition can be realized.
In an embodiment, the base station system may periodically collect and store the maximum available wireless bandwidth calculation parameter; when the base station system acquires the maximum available bandwidth of the current base station system in real time, the base station system directly reads the stored maximum available wireless bandwidth calculation parameters and calculates to obtain the maximum available wireless bandwidth.
In another embodiment, the base station system may periodically collect the maximum available wireless bandwidth calculation parameter, calculate and store the maximum available wireless bandwidth; when the base station system acquires the maximum available bandwidth of the current base station system in real time, the base station system directly reads the stored maximum available wireless bandwidth.
Of course, the present invention is not limited to this, and for example, the maximum available wireless bandwidth of the current base station system may also be collected and calculated after receiving the user service flow request.
Wherein, for the forward maximum available wireless bandwidth:
the base station system periodically collects forward throughput ThruptF, forward time slot occupancy Idle and forward bandwidth adjustment factor BfFactor, and obtains the current maximum available forward wireless bandwidth MaxBWf of the base station system through calculation of MaxBWf ThruptF multiplied by BfFactor divided by Idle; the forward bandwidth adjustment factor BfFactor is related to the specific QOS access service type, and needs to be configured reasonably according to the specific service type and by combining with the application in engineering. The forward bandwidth adjustment factor BfFactor has a value range of: (0,1].
For the reverse maximum available wireless bandwidth:
the base station system periodically collects an occupation status bit (RA) and a reverse average throughput ThruptR of a reverse link, calculates a reverse idle ratio RABIdleRatio according to the RA, and calculates a current reverse maximum available wireless bandwidth MaxBWf of the base station system by combining a reverse bandwidth adjustment factor BrFactor and a MaxBWr. The brefactor is related to a specific QOS service type, and needs to be reasonably configured according to the specific service type and by combining with engineering application, and the value range of the reverse bandwidth adjustment factor brefactor is as follows: is (0, 1).
And step 13, the base station system carries out admission judgment on the user request service flow according to the residual wireless bandwidth.
The admission judgment of the QOS service flow requested by the user specifically comprises the following steps:
judging whether the current residual wireless bandwidth resource is larger than or equal to the QOS service flow bandwidth requested by the user:
if the current residual wireless bandwidth of the base station system is larger than or equal to the QOS service flow bandwidth requested by the user, directly admitting the QOS service flow requested by the user;
preferably, if the current remaining wireless bandwidth of the base station system is smaller than the QOS service flow bandwidth requested by the user, another set of sub-optimal QOS parameters provided by the user is continuously obtained to continue the admission judgment.
Of course, the method is not limited to this, and the admission may be directly rejected if the wireless bandwidth currently remaining in the base station system is smaller than the QOS traffic bandwidth requested by the user.
Taking the forward QOS service request as an example, after the base station system receives a new QOS service request from a user, the base station system obtains a forward identifier and/or a reverse identifier in the QOS service request, and if the service flow requested by the user has a forward QOS service flow, it is determined whether the real-time obtained forward maximum available wireless bandwidth MaxBWf minus the allocated forward QOS service flow bandwidth allocatedbvf is greater than or equal to the forward service flow bandwidth FlowBFReq applied by the user.
If MaxBWf-allocated bwf ═ FlowBFReq, that is, the current forward remaining wireless bandwidth of the base station system is greater than or equal to the forward QOS service flow bandwidth applied by the user, directly admitting the forward QOS service request applied by the user;
if the MaxBWf-allocatedBWf is less than the FlowBFReq, namely the current residual forward wireless bandwidth of the base station system does not meet the forward QOS service flow bandwidth applied by the user, the preferred mode does not directly initiate admission rejection, but continuously obtains another set of suboptimum QOS parameters provided by the user to continuously carry out admission judgment.
When a user initiates a QOS service request, more than one set of QOS parameters are usually provided, and sorted according to priority, usually the top is optimal, and the bottom is suboptimal, and reported to the base station system according to the order. When the system receives the QOS forward service request of the user, firstly, the admission control judgment is carried out according to the optimal group of QOS parameters requested by the user.
The admission process for user reverse QOS traffic flows is similar to the admission process for forward QOS traffic flows and will not be described in detail here.
Taking the forward service flow as an example, the step 12 and the step 13 are specifically shown in fig. 2, and include the following steps:
step 110: collecting forward throughput ThruptF and time slot occupancy Idle reported periodically by a base station;
step 120: obtaining the current maximum available forward wireless bandwidth MaxBWf of the base station system by combining a forward bandwidth adjustment factor BfFactor; acquiring the currently allocated forward wireless bandwidth in the base station system to obtain the current residual forward wireless bandwidth;
step 130: judging whether the residual forward wireless bandwidth of the base station system is more than or equal to the QOS forward service flow bandwidth applied by the user; if yes, go to step 140, otherwise go to step 150;
step 140, directly admitting the forward QOS service flow requested by the user, and ending;
step 150, judging whether the user can be admitted by reducing the priority of the user forward QOS service flow; if yes, go to step 160, otherwise go to step 170;
step 160, reducing the priority of QOS forward service flow of the user and receiving the forward QOS service flow, and ending;
step 170, judging whether the requested user forward QOS service flow can be admitted by reducing the priority of the QOS forward service flow of the user already accessed to the base station system; if yes, go to step 180, otherwise go to step 190;
step 180, reducing at least one QoS forward service flow priority already accessed into the system, admitting user forward QoS service flow, and ending;
step 190, system resources are tight, and the user is refused to accept the forward QOS service flow requested by the user.
If the user provides several sets of QOS parameters, the base station system performs admission judgment, and the result of admission judgment is that the current remaining forward wireless bandwidth of the base station system cannot meet the access service request of the user, which indicates that the forward wireless bandwidth of the current sector is short. But still does not directly initiate admission rejection, and the base station system identifies which QOS forward service flows are subjected to the downgrading process and then releases forward wireless bandwidth plus the current remaining wireless bandwidth of the sector, so that the QOS service request with the lowest priority of the user can be met. This is done to minimize the impact on the experience of using already accessed QOS users. On the other hand, if the user specifies that access must be made according to a certain set of QOS parameters, the base station system coordinates resources for the user according to the QOS forward traffic bandwidth specified by the user.
In addition, if the base station system obtains the forward maximum available wireless bandwidth MaxBWf < AllocatedBWf and/or the reverse maximum available wireless bandwidth MaxBWr < AllocatedBWr in real time, it indicates that the base station system cannot continue to provide service for the QOS service flow that has been accessed due to a change in wireless environment (e.g., a change in air interface environment (e.g., weather conditions), blockage of a building due to terminal movement, a change in user service mode, etc.). At this time, the base station system can further degrade the accessed QOS service flow, and in a manner of reducing at least one QOS service level, the base station system can still provide a service meeting the basic requirements for the accessed QOS user under the condition of the deterioration of the wireless environment. Taking the forward wireless bandwidth as an example, the process is shown in fig. 3, and may specifically include the following steps:
step 220: obtaining the current maximum available forward wireless bandwidth MaxBWf of the base station system by combining a forward bandwidth adjustment factor BfFactor; acquiring the currently allocated forward wireless bandwidth in the base station system to obtain the current residual forward wireless bandwidth;
and step 250, degrading at least one QOS service flow accessed into the base station system.
Preferably, the base station system selects the user with the highest forward QOS service flow grade and the user set allowed to perform the downgrading process, and randomly selects at least one forward QOS service flow to perform the downgrading operation until MaxBWf > AllocatedBWf is satisfied.
If the QOS service flow with the highest forward service flow grade still does not satisfy MaxBWf > allocatedBWf after being degraded, the similar degradation processing needs to be carried out on the suboptimal QOS forward service flow.
In addition, there are many optional ways to select the forward QOS service flow that needs to be degraded, for example, based on the limitation of traffic, some users download and upload services for a long time, occupy more system resources, need to limit the consumption of network resources by users, and especially the consumption in busy hours, etc., can consider to reduce the priority of users properly, etc., and the purpose is to make the forward maximum available wireless bandwidth of the base station system meet the bandwidth requirement of the forward QOS service flow of the QOS user that has been accessed in the system.
Preferably, the reducing at least one forward QOS service level specifically comprises: the base station system properly reduces the dispatching priority of at least one service flow within the allowed range of the QOS service level of the user according to the currently allocated QOS wireless bandwidth;
further, decreasing the scheduling priority of at least one traffic flow may be decreasing the bandwidth allocated to the user.
The processing of the reverse QOS traffic flow is similar to the forward and will not be described in detail here.
Correspondingly, the present embodiment further provides an admission control device for user access in a base station system for implementing the above admission control method, as shown in fig. 4, the admission control device includes a service request receiving module, a remaining wireless bandwidth acquiring module, and an admission determining module:
a service request receiving module, which is used for receiving a user quality of service (QOS) service request, indicating a residual wireless bandwidth obtaining module and sending the QOS service flow grade requested by the user to an admission judging module;
the residual wireless bandwidth acquisition module is used for acquiring the current maximum available wireless bandwidth of the base station system in real time after receiving the instruction of the service request receiving module, acquiring the wireless bandwidth of the current QOS service flow allocated to the base station system, obtaining the current residual wireless bandwidth and sending the current residual wireless bandwidth to the admission judgment module;
and the admission judgment module is used for acquiring the QOS service flow grade of the user accessed into the base station system and carrying out admission judgment on the QOS service flow requested by the user according to the residual wireless bandwidth by combining the QOS service flow grade of the user accessed into the base station system and the QOS service flow grade of the user requested currently.
Furthermore, the device also comprises an acquisition module and a storage module;
the acquisition module is used for periodically acquiring the maximum available wireless bandwidth calculation parameters; obtaining the maximum available wireless bandwidth according to the maximum available wireless bandwidth calculation parameter, and sending the maximum available wireless bandwidth to the storage module, or directly sending the maximum available wireless bandwidth calculation parameter to the storage module;
the storage module is used for storing the maximum available wireless bandwidth or the maximum available wireless bandwidth calculation parameter sent by the acquisition module;
when the residual wireless bandwidth acquisition module acquires the current maximum available wireless bandwidth of the base station system in real time, the residual wireless bandwidth acquisition module directly reads the maximum available wireless bandwidth calculation parameters in the storage module and calculates to obtain the maximum available wireless bandwidth; alternatively, the maximum available wireless bandwidth in the memory module is read directly.
Further, the apparatus also includes a downgrading module;
the acquisition module also sends the maximum available wireless bandwidth or the maximum available wireless bandwidth calculation parameter to the degradation judgment module;
the judging module is used for judging whether the maximum available wireless bandwidth is smaller than the wireless bandwidth of the QOS service flow which is currently allocated or not when the maximum available wireless bandwidth is acquired or the maximum available wireless bandwidth is acquired according to the maximum available wireless bandwidth calculation parameter and the wireless bandwidth of the QOS service flow which is currently allocated by the base station system is acquired; and if the maximum available wireless bandwidth is less than the wireless bandwidth of the currently allocated QOS service flow, the degradation module reduces at least one accessed QOS service level until the maximum available wireless bandwidth is more than or equal to the wireless bandwidth of the currently allocated QOS service flow.
After adopting the technical scheme, compared with the prior art, the invention has the following advantages: when a user QOS service flow is accessed, real-time forward wireless bandwidth information and reverse wireless bandwidth information are acquired instead of pre-configured bandwidth to determine whether to admit the service flow and which priority QOS service flow to admit the service flow so as to ensure that the service flow can provide required QOS service after being accessed. In addition, after the QOS service flows of all priorities of the user are tried to be failed to be admitted, the QOS service request of the user is not directly rejected, and the QOS service flow level of the accessed user is properly reduced within the allowed range of the priority of the QOS service flow of the accessed user. This has the advantage of maximizing the QOS traffic flow capacity of the base station system to the extent that the QOS traffic flow of the user is acceptable. In addition, the invention also provides how to ensure the use experience of the QOS user accessed to the system under the condition of real-time change of the system front and back wireless bandwidth caused by real-time change of wireless signals, namely periodically collecting the front and back real-time bandwidth of the base station system and comparing the front and back real-time bandwidth with the front and back wireless bandwidth of the allocated QOS service flow to determine whether to properly reduce the QOS priority level of the accessed QOS service flow or not, thereby ensuring the use experience of all users in the system.
An application example of the present invention will be described in detail below with reference to the above-described embodiments.
Example one: and (3) user forward QOS service flow admission process:
the forward wireless bandwidth information collected by the base station system comprises: ThruptF 2000kbps, IdleT 0.75; AllocatedBWf already allocated 2000 kbps; calculating the current forward maximum available bandwidth MaxBWf of the base station system to be 2133.3kbps, and then the current forward residual bandwidth to be 133.3 kbps;
if the priority of the forward QOS service flow requested in the current time is as follows:
BandReqF0＝200kbps；
BandReqF1＝150kbps；
BandReqF2＝120kbps；
therefore, the result of determining whether to admit the new user forward QOS service flow in the present application is as follows:
cannot accommodate BandReqF0 and BandReqF 1;
may receive the BandReqF2,
thus, the user forward QOS traffic admission is successful.
Example two: user reverse QOS service flow admission process:
the forward wireless bandwidth information collected by the base station system comprises: thruprtr 1239kbps, rabidledratio 0.56, BrFactor 0.8, AllocatedBWr 1600 kbps; calculating to obtain the current reverse maximum available bandwidth MaxBWr of 1770kbps of the base station system; the current forward residual bandwidth is 170 kbps;
if the priority of the reverse QOS service flow of the application is as follows:
BandReqR0＝200kbps；
BandReqR1＝150kbps；
BandReqR2＝120kbps；
therefore, the result of determining whether to admit the new user reverse QOS service flow in the present application is as follows:
cannot accept BandReqR 0;
may receive BandReqR 1;
thus, the user reverse QOS traffic admission is successful.
Example three: adjusting process of QOS reverse service flow priority when wireless signal quality changes:
the reverse wireless bandwidth information collected by the base station system comprises: thruprtr 1102kbps, rabidledratio 0.56, BrFactor 0.8; allocated AllocatedBWr 1600 kbps; the current reverse maximum available bandwidth MaxBWr of the base station system is 1575 kbps;
MaxBWr < AllocatedBWr, therefore, the reverse maximum available bandwidth of the base station system is not sufficient to accommodate all QOS reverse traffic flows in the system, requiring a reduction in the level of partially accessed QOS reverse traffic flows such that MaxBWr < AllocatedBWr.
Compared with the prior art, the invention realizes the dynamic admission of the forward and reverse service flows of the QOS user of the base station system. The forward throughput thruptF and the time slot occupancy Idle reported by the forward acquisition base station periodically are combined with a reverse bandwidth adjustment factor BfFactor to estimate the current maximum available wireless bandwidth MaxBWf of the system, and the bandwidth is compared with the sum of the bandwidth of the forward QOS service flow of a new user and the allocated bandwidth allocatedBWf of the forward QOS service flow to decide whether to admit the forward QOS service flow of the user or to downgrade the forward QOS service flow of the user, or to reduce the grade of the forward QOS service flows of other users in the system so as to successfully admit the forward QOS service flow. The reverse direction dynamically estimates the current reverse maximum available wireless bandwidth MaxBWr of the system by collecting the reverse throughput ThruptR reported periodically by the base station and the busy-idle ratio RABIdleRatio of the reverse RA, compares the current reverse maximum available wireless bandwidth MaxBWr with the sum of the reverse QOS service flow BandReqR applied by the new user and the reverse QOS service flow bandwidth AllocatedBWr already allocated by the system, and adopts a similar mode with the forward direction to carry out admission processing. Under the condition of wireless signal conversion, when no QOS user is accessed, the front and reverse maximum available wireless bandwidth MaxBWf and MaxBWr of the base station system are periodically and dynamically estimated, and compared with the front and reverse QOS service flow bandwidth already allocated in the system, so as to decide whether to reduce the level of part of QOS service flow in the base station system, and the system can provide service meeting the priority requirement of the service flow for all QOS service flows.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An admission control method for user access in a base station system comprises the following steps:
when a base station system receives a user quality of service (QOS) service request, acquiring the current maximum available wireless bandwidth of the base station system in real time, and acquiring the wireless bandwidth of the current QOS service flow allocated to the base station system to obtain the current residual wireless bandwidth;
and the base station system performs admission judgment on the QOS service flow requested by the user according to the residual wireless bandwidth by combining the QOS service flow grade of the user accessed into the base station system and the QOS service flow grade of the user requested currently.
2. The method of claim 1, wherein:
the new QOS service flow requested by the user is a forward QOS service flow and/or a reverse QOS service flow; the current maximum available wireless bandwidth comprises a forward maximum available wireless bandwidth (MaxBWf) and/or a reverse maximum available wireless bandwidth (MaxBWr); the wireless bandwidth of the allocated QOS traffic flow includes allocated forward QOS traffic flow bandwidth (allocated bwf) and/or allocated reverse QOS traffic flow bandwidth (allocated bwr);
when the base station system receives a new QOS service request of a user, a forward identification and/or a reverse identification in the QOS service request are/is obtained;
and the base station system respectively carries out admission judgment on the forward QOS service flow and the reverse QOS service flow requested by a user according to the residual forward wireless bandwidth and the residual reverse wireless bandwidth.
3. The method according to claim 1 or 2, wherein the step of the base station system acquiring the current maximum available wireless bandwidth of the base station system in real time specifically comprises:
the base station system periodically collects and stores the maximum available wireless bandwidth calculation parameters; when the base station system acquires the current maximum available bandwidth of the base station system in real time, directly reading the stored maximum available wireless bandwidth calculation parameters, and calculating to obtain the maximum available wireless bandwidth; or,
the base station system periodically collects the maximum available wireless bandwidth calculation parameters, calculates and stores the maximum available wireless bandwidth; and when the base station system acquires the current maximum available bandwidth of the base station system in real time, directly reading the stored maximum available wireless bandwidth.
4. The method of claim 1 or 2, wherein:
when the user initiates the QOS service request, providing more than one group of QOS parameters, sequencing according to the priority of the QOS parameters, wherein the QOS parameters are arranged in the front to be optimal and then to be suboptimal; when the base station system receives a QOS forward service request of a user, carrying out admission control judgment according to an optimal group of QOS parameters requested by the user;
the admission judgment of the QOS service flow requested by the user specifically comprises the following steps:
judging whether the current residual wireless bandwidth resource is larger than or equal to the QOS service flow bandwidth requested by the user:
if the current residual wireless bandwidth of the base station system is more than or equal to the QOS service flow bandwidth requested by the user, directly admitting the QOS service flow requested by the user;
if the current residual wireless bandwidth of the base station system is smaller than the QOS service flow bandwidth requested by the user, the other set of sub-optimal QOS parameters provided by the user is continuously obtained to continuously carry out admission judgment.
5. The method of claim 1, wherein:
if the current residual wireless bandwidth of the base station system is smaller than the QOS service flow bandwidth requested in all QOS parameters provided by the user;
the base station system judges whether the requested user forward QOS service flow can be accepted by reducing the QOS service flow grade of the user who has accessed the base station system;
if yes, reducing at least one QOS service flow grade in the accessed system, and admitting the user forward QOS service flow;
otherwise, refusing to admit the QOS service flow requested by the user.
6. The method of claim 1, 2 or 5, wherein:
after the base station system acquires the maximum available wireless bandwidth and the wireless bandwidth of the currently allocated QOS service flow, whether the maximum available wireless bandwidth is smaller than the wireless bandwidth of the currently allocated QOS service flow is judged;
and if the maximum available wireless bandwidth is not less than the wireless bandwidth of the currently allocated QOS service flow, the base station system reduces at least one accessed QOS service level until the maximum available wireless bandwidth acquired by the base station system in real time is more than or equal to the wireless bandwidth of the currently allocated QOS service flow.
7. The method of claim 6, wherein:
the reducing of the at least one QOS service level is specifically that the base station system properly reduces the scheduling priority of at least one service flow within the range allowed by the QOS service level according to the currently allocated QOS wireless bandwidth.
8. An admission control device for user access in a base station system is characterized in that the device comprises a service request receiving module, a residual wireless bandwidth obtaining module and an admission judging module:
the service request receiving module is used for receiving a user quality of service (QOS) service request, indicating the residual wireless bandwidth obtaining module and sending the QOS service flow grade requested by the user to the admission judging module;
the remaining wireless bandwidth acquiring module is used for acquiring the current maximum available wireless bandwidth of the base station system in real time after receiving the indication of the service request receiving module, acquiring the wireless bandwidth of the current QOS service flow allocated to the base station system, acquiring the current remaining wireless bandwidth and sending the current remaining wireless bandwidth to the admission judging module;
and the admission judgment module is used for acquiring the QOS service flow grade of the user accessed into the base station system and carrying out admission judgment on the QOS service flow requested by the user according to the residual wireless bandwidth by combining the QOS service flow grade of the user accessed into the base station system and the QOS service flow grade of the user requested currently.
9. The apparatus of claim 8, further comprising an acquisition module and a storage module;
the acquisition module is used for periodically acquiring the maximum available wireless bandwidth calculation parameters; obtaining the maximum available wireless bandwidth according to the maximum available wireless bandwidth calculation parameter, and sending the maximum available wireless bandwidth to the storage module, or directly sending the maximum available wireless bandwidth calculation parameter to the storage module;
the storage module is used for storing the maximum available wireless bandwidth or the maximum available wireless bandwidth calculation parameter sent by the acquisition module;
when the residual wireless bandwidth acquisition module acquires the current maximum available wireless bandwidth of the base station system in real time, the residual wireless bandwidth acquisition module directly reads the maximum available wireless bandwidth calculation parameters in the storage module and calculates to obtain the maximum available wireless bandwidth; or, directly reading the maximum available wireless bandwidth in the storage module.
10. The apparatus of claim 9, wherein the apparatus further comprises a downgrade module;
the acquisition module further sends the maximum available wireless bandwidth or the maximum available wireless bandwidth calculation parameter to the degradation judgment module;
the judging module is used for judging whether the maximum available wireless bandwidth is smaller than the wireless bandwidth of the QOS service flow which is distributed currently when the maximum available wireless bandwidth is obtained or the maximum available wireless bandwidth is obtained according to the maximum available wireless bandwidth calculation parameter and the wireless bandwidth of the QOS service flow which is distributed currently by the base station system is obtained; and if the maximum available wireless bandwidth is smaller than the wireless bandwidth of the currently allocated QOS service flow, the degradation module reduces at least one accessed QOS service level until the maximum available wireless bandwidth is larger than or equal to the wireless bandwidth of the currently allocated QOS service flow.
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