CN101511120B - Accommodation control method and device - Google Patents
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Abstract
The invention provides an admission control method which includes steps as follows: when a terminal processes access, confirming a connected terminal amount of a subdistrict accessed by the terminal whether lesser than a maximum terminal amount of the subdistrict, confirming the terminal whether can access the subdistrict according with a corresponding subdistrict state. The invention also provides a device for realizing admission control, the method and the device can realize a sharing information admission efficiently, increase system performance and service quality.
Description
Technical Field
The present invention relates to admission control technologies, and in particular, to an admission control method and an admission control device.
Background
With the development of mobile communication technology, High Speed Packet Access (HSPA) technology, including High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA) and HSPA +, has been introduced in succession in order to improve peak traffic rates and system capacity. The HSPA system adopts high-order modulation, such as 16 Quadrature Amplitude Modulation (QAM) and 64QAM, as well as Adaptive Modulation Coding (AMC), hybrid automatic repeat request (HARQ), Node B fast scheduling, and Multiple Input Multiple Output (MIMO) and other key technologies, which greatly improves the traffic peak rate and the overall throughput of the cell.
In the HSPA system, the resource sharing characteristic makes the RNC need not consider the code channel factor when admitting the terminal, therefore, the current admission control algorithm is mainly based on the fixed terminal number, the admission control method flow in the prior art is: firstly, configuring an admission terminal number threshold for an RNC according to the resource number, control channel overhead and the like, wherein the terminal number threshold is collectively called as a maximum terminal number hereinafter; then, when the terminal accesses, the RNC judges whether the number of the access terminals is less than the threshold, if so, the terminal is admitted to access the shared channel cell, otherwise, the terminal is refused to access the shared channel cell.
The admission control scheme described above is relatively simple and easy to implement, but has some problems, mainly two aspects:
on one hand, the unreasonable value of the maximum terminal number influences the system performance. Under the conditions of different channels and different resource numbers, the value of the maximum terminal number may be different, so that if the value of the maximum terminal number is not proper, the system performance is influenced. If the maximum terminal number is large, the number of access terminals is large, and the data rate of the edge terminal may not be guaranteed or the data rate of the high-priority terminal may be affected; and if the maximum terminal number is too small, the resource utilization rate is low, and the scheduling gain is low.
On the other hand, an admission control strategy based on the number of fixed terminals is only from the viewpoint of cell capacity, and whether the access of a new terminal can damage the service quality of a terminal connected in a cell is not considered, although cell resources are shared by multiple terminals, the resources are limited after all, under the condition of a certain scheduling algorithm, the probability that each terminal in the cell obtains service is smaller as the number of terminals sharing the resources is larger, and particularly when the scheduling priorities of the terminals are not greatly different, the probability that the terminal obtains service is rapidly reduced along with the increase of the number of the terminals, so that the service quality of the terminal can not be effectively guaranteed.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide an admission control method and apparatus, which can effectively implement admission of a shared channel and improve system performance and service quality.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides an admission control method, which comprises the following steps:
when the terminal accesses, after determining that the number of connected terminals of a cell accessed by the terminal is less than the maximum number of terminals of the cell, determining whether the terminal can access the cell according to the cell state corresponding to the cell.
Wherein the method further comprises: when the terminal accesses, when the number of the connected terminals of the cell accessed by the terminal is determined to be not less than the maximum number of the terminals of the cell, the terminal is refused to access the cell.
The method further comprises the following steps: and determining whether the terminal can access the cell according to the cell state corresponding to the cell and the condition of distributing relevant special resources for the terminal.
The determining whether the terminal can access the cell according to the condition of allocating the relevant dedicated resource to the terminal and the cell state of the cell specifically comprises:
when the radio network controller RNC successfully distributes related special resources for the terminal and the RNC determines that the cell state is allowed to be accessed according to the cell state variable, the terminal is admitted to be accessed to the cell; otherwise, rejecting the terminal to access the cell.
After determining that the number of connected terminals of the cell accessed by the terminal is less than the maximum number of terminals of the cell, the method further includes:
according to the first access or the re-access of the terminal, the RNC correspondingly sends a wireless link establishment or reconfiguration request message to the base station Node B; and, the message includes shared channel use indication information.
The method further comprises the following steps:
node B receives the message, and determines that the message contains shared channel use indication information, then determines the state of the cell according to the state variable of the cell, if the state of the cell is determined to be allowed to access, then Node B allocates corresponding resources for the terminal according to the message, and then correspondingly returns a message of successful establishment of a wireless link or successful reconfiguration to RNC; if the cell state is determined to be access refusal, the Node B correspondingly returns a message of radio link establishment failure or reconfiguration failure to the RNC.
After determining that the number of connected terminals of the cell accessed by the terminal is less than the maximum number of terminals of the cell, the method further includes:
the RNC allocates relevant dedicated resources to the terminal.
The determining whether the terminal can access the cell according to the condition of allocating the relevant dedicated resource to the terminal and the cell state corresponding to the cell specifically comprises: when the message that the establishment of the wireless link is successful or the reconfiguration is successful is received and the relevant special resources are successfully distributed, allowing the terminal to access the cell; and if not, rejecting the terminal to access the cell.
The setting method of the cell state variable specifically comprises the following steps:
counting the number of scheduling requests and scheduling allowances in a counting period, and calculating and outputting a measured value according to the number when the counting period is up;
comparing the output measurement value with an admission control factor, and setting a cell state variable to allow access if the output measurement value is not less than the admission control factor; otherwise, setting the state variable of the cell as access refusal.
The calculation output measurement value is specifically:
wherein eta ismeasureFor the initial output measurement value, M is the number of scheduling requests in a statistical period, N is the number of scheduling allowables in a statistical period, N represents that the statistical period is N TTIs, j represents the serial numbers of all TTIs in a statistical period, NjRepresents the scheduling allowance number, M, in the jth TTI in the statistical periodjIndicating the number of scheduling requests in the jth TTI in the counting period.
After calculating the output measurement, the setup method further includes:
and smoothing the output measurement value:
ηi＝f·ηi-1+(1-f)·ηmeasure
wherein eta isiIs the smoothed output measurement value, eta, corresponding to the ith statistical periodi-1Is the output measured value after the smoothing processing corresponding to the i-1 th statistical period, i is not less than1, and η00, f is the smoothing factor.
The invention also provides a device for realizing admission control, which comprises: the system comprises a terminal number judging module, an access judging module, a cell state setting module, a message generating module and a data sending module; wherein,
the terminal number judging module is used for determining to send a judging signal to the access judging module or send a failure message generating signal to the message generating module according to whether the number of terminals connected in a cell corresponding to a device to which the terminal belongs is less than the maximum terminal number supported by the cell when the terminal requests to access;
the access judgment module is used for searching the cell state from the cell state setting module after receiving the judgment signal; when the cell state is the access permission state, a success message generation signal is sent to a message generation module; when the cell state is access refusal, a failure message generation signal is sent to a message generation module;
the cell state setting module is used for correspondingly returning the current setting value of the cell state variable when the access judging module searches the cell state;
the message generating module is used for correspondingly generating an access failure message or an access success message and sending the access failure message or the access success message to the data sending module after receiving the failure message generating signal or the success message generating signal;
and the data sending module is used for sending the message to the terminal when receiving the access success message or the access failure message.
The access judging module is further used for distributing relevant special resources for the terminal;
correspondingly, when the cell state is allowed to be accessed and the terminal is successfully allocated with the relevant special resources, the success message generation signal is sent; and when the cell state is access rejection or the failure of allocating the relevant special resources for the terminal, sending the failure message generation signal.
The cell state setting module is further configured to: and calculating an output measurement value according to the scheduling request variable and the scheduling permission variable obtained by statistics, and correspondingly setting a cell state variable according to the magnitude relation between the output measurement value and the admission judgment factor.
The cell state setting module includes: the device comprises a quantity counting module, a calculating module, a setting module and an information interaction module; wherein,
the quantity counting module is used for counting the scheduling requests and the scheduling allowed quantity in a counting period and sending the quantity information to the calculating module when the counting period is up;
the calculation module is used for calculating an output measurement value according to the quantity information and sending the calculated output measurement value to the setting module;
the setting module is used for setting the state variable of the cell as the permission access or the rejection access according to whether the output measured value is not less than the admission judgment factor;
and the information interaction module is used for returning the current set value of the cell state variable to the access judgment module when the access judgment module inquires the cell state variable.
The invention also provides another device for realizing admission control, which comprises: the system comprises a data receiving module, a message judging module, an access judging module, a resource allocation module, a cell state setting module, a message generating module and a data sending module; wherein,
the data receiving module is used for receiving a wireless link establishment or reconfiguration request message sent by the RNC and then sending the message to the message judging module and the resource allocation module;
the message judging module is used for determining to send a judging signal to the access judging module or send an allocation control signal to the resource allocation module according to whether the received message contains shared channel use indication information;
the access judging module is used for searching the cell state from the cell state setting module after receiving the judging signal, and sending an allocation control signal to the resource allocation module when the cell state is allowed to be accessed; when the cell state is access refusal, a failure message generation signal is sent to a message generation module;
the resource allocation module is used for carrying out corresponding resource allocation after receiving the message and the allocation control signal, and then sending a successful message generation signal to the message generation module;
the cell state setting module is used for correspondingly returning the current setting value of the cell state variable when the access judging module inquires the cell state variable;
a message generating module, configured to generate a corresponding radio link establishment success message or reconfiguration success message, or a radio link establishment failure message or reconfiguration failure message after receiving the signal, and send the message to a data sending module;
and the data sending module is used for sending the message to the corresponding RNC after receiving the message.
Wherein the cell state setting module is further configured to: and calculating an output measurement value according to the scheduling request variable and the scheduling permission variable obtained by statistics, and correspondingly setting a cell state variable according to the magnitude relation between the output measurement value and the admission judgment factor.
The cell state setting module includes: the device comprises a quantity counting module, a calculating module, a setting module and an information interaction module; wherein,
the quantity counting module is used for counting the scheduling requests and the scheduling allowed quantity in a counting period and sending the quantity information to the calculating module when the counting period is up;
the calculation module is used for calculating an output measurement value according to the quantity information and sending the calculated output measurement value to the setting module;
the setting module is used for setting the state variable of the cell as the permission access or the rejection access according to whether the output measured value is not less than the admission judgment factor;
and the information interaction module is used for returning the current set value of the cell state variable to the access judgment module when the access judgment module inquires the cell state variable.
When the terminal accesses the shared channel, the admission control method and the admission control device not only judge whether the terminal is admitted according to the relation between the number of the connected terminals of the cell accessed by the terminal and the maximum number of the terminals of the cell, but also judge whether the terminal is admitted according to the condition of distributing relevant special resources for the terminal and the state of the cell corresponding to the cell, thereby making up the influence on the system performance caused by improper dereferencing of the maximum number of the terminals, reducing the system load and improving the system performance; and the ratio of the scheduling permission related to the service quality and the statistic of the scheduling request is used as the basis for setting the cell state and further as the criterion for accessing the shared channel by the user, thereby effectively realizing the admission of the shared channel, improving the service quality for the user and increasing the satisfaction degree of the user.
Drawings
Fig. 1 is a schematic flow chart of an admission control method when a cell state is set in an RNC according to the present invention;
FIG. 2 is a flow chart of an admission control method when a cell state is set at a Node B according to the present invention;
FIG. 3 is a flow chart of a cell status setting method according to the present invention;
FIG. 4 is a schematic structural diagram of an apparatus for implementing admission control according to the present invention;
FIG. 5 is a schematic structural diagram of an apparatus for implementing admission control according to the present invention;
fig. 6 is a schematic structural diagram of a cell status setting module according to the present invention.
Detailed Description
The main idea of the invention is as follows: and when the terminal accesses and determines that the number of connected terminals of the cell accessed by the terminal is less than the maximum number of terminals of the cell, determining whether the terminal can access the cell according to the condition of allocating related special resources for the terminal and the cell state corresponding to the cell. The setting of the cell state may be at the RNC side or at the Node B side.
Hereinafter, the implementation of the admission control method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
The admission control method provided by the invention can be suitable for HSUPA systems, shared channels of R4, HSDPA, HSPA +, 3GPP Long Term Evolution (LTE) systems and the like. In the following embodiments, a Low Chip Rate (LCR) Time Division Duplex (TDD) HSUPA system is exemplified.
Fig. 1 is a schematic flow chart of an admission control method when a cell state is set in an RNC according to the present invention, as shown in fig. 1, the method includes:
step 101: when the terminal is accessed for the first time or accessed again, the RNC judges whether the number of the connected terminals in the cell which the terminal wants to access is less than the maximum number of the terminals of the HSUPA service supported by the cell, if so, executing the step 102; otherwise, step 105 is performed.
Here, the first access of the terminal is an access process initiated when the terminal initially accesses the network; re-access by a terminal is an access procedure initiated when the terminal is handed over from one cell to another. Specifically, how to set the maximum number of terminals and how to perform the determination belong to the known technology, and are not described herein again.
Step 102: the RNC allocates a downlink dedicated channel for the terminal, and if the downlink dedicated channel is successfully allocated, step 103 is executed; otherwise, step 105 is performed.
The resources allocated by the RNC to the terminal vary according to the system to which the admission control method of the present invention is applied, for example, in HSDPA, uplink and downlink dedicated channels are allocated to the user, and in HSPA +, no dedicated resources are allocated to the user. In the following description, the above cases are collectively referred to as: the RNC allocates relevant dedicated resources to the terminal.
Wherein, how to allocate the relevant dedicated resources by the RNC belongs to the known technology, and is not described herein again.
Step 103: the RNC discriminates the cell state according to the cell state variable, and if the cell state variable is access-allowed, the RNC performs step 104, and if the cell state variable is access-denied, the RNC performs step 105.
The RNC specifically determines the cell state as follows: and judging the value of the corresponding cell state variable which represents the cell state, and obtaining the current cell state according to the current set value of the cell state variable. The setting method for representing the cell state variable may use the method shown in fig. 3, and a detailed description of a cell state variable setting method flow will be performed in the description of fig. 3, which is not described herein again.
In addition, in the embodiment shown in fig. 1, the determination of the cell state and the cell state variable may also be completed in the Node B, which will be described in detail in the embodiment described in fig. 2 and will not be described again here.
As illustrated in fig. 3, the cell states are divided into two types: allow access and deny access.
Step 104: and the RNC returns a corresponding access success message to the terminal, and the current process is finished.
Step 105: RNC returns relative access failure message to terminal, and the current flow is finished.
Further, in the embodiment shown in fig. 1, the order of step 102 and step 103 may be reversed, i.e. step 102 and step 103 may be transformed into:
step 102': the RNC firstly determines the cell status, taking the cell status representation method shown in fig. 3 as an example, and executes step 103' when the cell status is allowed to access; otherwise, step 105 is performed.
Step 103': RNC distributes special channel for HSUPA terminal downlink, if the downlink special channel distribution is successful, then step 104 is executed; otherwise, step 105 is performed.
Fig. 2 is a flowchart illustrating an admission control method when the cell state is set in a Node B according to the present invention, as shown in fig. 2, the method includes:
step 201: when the terminal is accessed for the first time or accessed again, the RNC judges whether the HSUPA terminal connected in a certain cell is smaller than the maximum terminal number of the HSUPA service supported by the cell, if so, the step 202 is executed; otherwise, step 210 is performed.
Specifically, how to set the maximum number of terminals and how to perform the determination belong to the known technology, and are not described herein again.
Step 202: the RNC allocates a downlink dedicated channel for the terminal, and if the downlink dedicated channel is successfully allocated, step 203 is executed; otherwise, step 210 is performed.
Wherein, how to allocate the downlink dedicated channel by the RNC belongs to the known technology, and is not described herein again.
Step 203: RNC sends wireless link establishment or reconfiguration request message to Node B, requesting Node B to allocate resources such as control channel.
Wherein, according to the terminal accessed in step 201 is the first access or the re-access, the RNC correspondingly sends a radio link establishment or reconfiguration request message to the Node B. When the terminal desiring access in step 201 needs to access the shared channel, the shared channel use instruction information is included in the radio link setup message or the reconfiguration request message in this step.
The shared channel use indication information, which is used to indicate whether the shared channel needs to be used, includes, for example, an Information Element (IE): enhanced dedicated channel information (E-DCH information), high speed downlink shared channel (HS-DSCH) information, and the like.
Step 204: after receiving the radio link establishment or reconfiguration request message sent by the RNC, the Node B determines whether the message contains the shared channel use indication information, and if so, performs step 205; otherwise, step 207 is performed.
Wherein, the Node B may specifically determine how to perform the message by using the related technology in the prior art, and details are not described here.
The adding of the shared channel use indication information to the message in step 203 and the performing of step 204 are all cases in which the terminal performing access in actual application does not perform shared channel access.
In the method provided by the present invention, the message sent in step 203 may not be added with the shared channel use indication information, and step 204 may be omitted. At this time, after receiving the message, the Node B directly performs step 205.
Step 205: node B judges the state of the cell according to the state variable of the cell, if the state variable of the cell is refused to access, then execute step 206; if the cell state variable is allowed access, step 207 is executed.
The same as the operation in step 103, except that the operation is done by the Node B, instead of the RNC as described in step 103.
Step 206: the Node B returns a radio link setup or reconfiguration failure message to the RNC, after which step 208 is performed.
Wherein, according to the wireless link establishment message or the reconfiguration request message received by the Node B, the wireless link establishment failure message or the reconfiguration failure message is correspondingly returned. How to generate the failure message and return the failure message to the RNC belongs to the known technology, and is not described herein again.
Step 207: according to the received message, Node B configures relative resource, and returns the message of establishing wireless link or reconfiguring success to RNC.
The resource information to be configured is carried in the received radio link establishment message or reconfiguration request message, and it belongs to a known technology how to perform resource configuration according to the message, and is not described herein again. Furthermore, as described in step 204, since the embodiment shown in fig. 2 includes a case that the channel requested to be accessed by the terminal is not a shared channel, the resource configured by the Node B may not be a shared resource.
Wherein, according to the wireless link establishment message or the reconfiguration request message received by the Node B, the successful message of wireless link establishment or the successful message of reconfiguration is correspondingly returned.
Step 208: the RNC receives the message returned by the Node B and determines the type of the message, and if the message is a radio link setup or reconfiguration success message, step 209 is executed, and if the message is a radio link setup or reconfiguration failure message, step 210 is executed.
Step 209: and returning an access success message to the terminal to admit the terminal to access the corresponding cell, and ending the current process.
Step 210: and returning an access failure message to the terminal to refuse the terminal to access the corresponding cell, and ending the current process.
Fig. 3 is a flowchart illustrating a method for setting a cell state variable according to the present invention. Before proceeding with the detailed description of the steps shown in fig. 3, the following definitions are first introduced:
scheduling request: scanning the cache information of all terminals by taking a Transmission Time Interval (TTI) as a scanning Interval, and once finding that data exists in the cache of a certain terminal, considering that a scheduling request is triggered;
scheduling allows: with TTI as a scanning interval, the scheduler sends scheduling grant information to the terminal once, which is a scheduling grant. The scheduling allows messages to be information necessary for data transmission or reception, such as assignment of code channels.
As shown in fig. 3, the method for setting cell state variables of the present invention includes:
step 301: the initial values of the initialized scheduling request variable M and the scheduling permission variable N are 0, the Cell State variable Cell _ Access _ State is initialized to be allowed to be accessed, and the admission judgment factor is alpha.
The scheduling request variable is used for recording the counted number of the scheduling requests in one TTI; the scheduling permission variable is used for recording the counted number of scheduling permission in one TTI; the Cell State variable Cell _ Access _ State includes two conditions, which are respectively: allowing access and denying access; the admission decision factor α is a preset value, and may be set autonomously according to specific situations, and may be obtained through simulation and other manners, and how to obtain the admission decision factor through simulation belongs to the known technology, and is not described herein again.
Step 302: and counting the number of scheduling requests and scheduling grants in the period T, and respectively recording the number into a scheduling request variable M and a scheduling grant variable N.
Wherein step 302 continues the statistics throughout the execution.
Step 303: and judging whether the counting period is reached, if so, executing the step 304, otherwise, continuing to judge until the counting period is reached, and executing the step 304.
Step 304: according to scheduling request variable M and scheduling permission variable NCalculating the output measurement value etameasureSmoothening it to ηiStep 305 is executed; then, the scheduling request variable M and the scheduling grant variable N are reset to 0, and step 302 is executed.
Wherein eta ismeasureThe calculation formula of (c) may be:
Wherein 0 < etameasureLess than or equal to 1, and, in etameasureThe reason for adding the constants a and b to the calculation formula (2) is to prevent the denominator from being equal to 0, so the values of a and b should be generally as small as possible, for example, the values of a and b are both less than or equal to 1; however, when the statistical period T is larger and the statistical values of M and N are larger, for example, the values of M and N may be 100 or even larger, at this time, ηmeasureCalculated according to M and N, and does not influence etameasureIn the principle of calculation accuracy, a and b may also be greater than 1, and are not limited herein.
Or, when the period T is n TTIs, the ratio of the scheduling allowance to the number of scheduling requests in each TTI may be obtained, and then the calculation of the output measurement value is performed, where the formula is:
wherein j represents the sequence number of each TTI in a statistical period, NjRepresents the scheduling allowance number, M, in the jth TTI in the statistical periodjIndicating the number of scheduling requests in the jth TTI in the counting period.
Further, η with the first onemeasureIn the calculation formula, the principle of taking the values of a and b is the same, and the values of a and b are generally less than or equal to 1, but when the values of M and N in one TTI are large, the case that the values of a and b are greater than 1 is not excluded.
In addition, the output measurement value eta corresponding to the statistical period T is calculated according to the output measurement value corresponding to each TTImeasureIn this case, the method flow from step 301 to step 307 can be used, and the difference is that in step 302, the scheduling grant and the number N of scheduling requests counted in each TTI are stored separatelyjAnd Mj(ii) a Accordingly, in step 304, all N are reset each time a statistical period T is reachedjAnd Mj。
Of course, in practical applications, there may be other ways to implement this calculation, such as: similarly, the method flow from step 301 to step 307 is used, and in step 302, N corresponding to each TTI is obtained according to statisticsjAnd MjDirectly calculating and storing an output measured value corresponding to the TTI; correspondingly, in step 304, the average value of the output measurement values is obtained directly according to the stored output measurement values corresponding to each TTI within the statistical period T, that is, the output measurement value η corresponding to the statistical periodmeasure. At this time, it is not M and N that needs to be reset, but variables of output measurement values corresponding to each TTI are stored.
Will etameasureIs smoothed to etaiThe calculation formula of (2) is as follows: etai＝f·ηi-1+(1-f)·ηmeasureWhere f is a smoothing factor, η0When the current statistical period number is i, η is equal to 0iRepresenting the output measured value after the smoothing processing corresponding to the current statistical period; etai-1Indicates the currentThe output measurement value after the smoothing processing corresponding to the previous statistical period of the statistical period, that is, the output measurement value after the smoothing processing corresponding to the i-1 th statistical period. Since i represents the serial number of the statistical period, the value of i is an integer not less than 1.
Wherein the initially calculated output measurement η may also be usedmeasureAs a criterion in step 305, namely: directly determining eta in step 305measureWhether or not > -. alpha is true.
How to implement the calculation in practical application belongs to the known technology, and is not described herein again.
Step 305: judgment of etaiIs α true? If yes, go to step 306; if not, go to step 307.
Step 306: and setting the Cell State variable Cell _ Access _ State as the allowed Access, and ending the current process.
Specifically, how to set the variable belongs to the known technology, and details are not described here.
Step 307: and setting a Cell State variable Cell _ Access _ State as Access rejection.
In the setting method shown in fig. 3, the cell state variables are represented by using the access permission and the access rejection, but the specific representation method of the cell state is not limited here, and the setting method may be set autonomously in practical applications.
Fig. 4 is a schematic structural diagram of an apparatus for implementing admission control according to the present invention, which may be used as an RNC in an admission control method according to the present invention, as shown in fig. 4, the apparatus includes: a terminal number judging module 410, an access judging module 420, a cell state setting module 430, a message generating module 440 and a data transmitting module 450; wherein,
the terminal number determining module 410 is configured to determine whether the number of terminals connected in a cell corresponding to a device to which the terminal belongs is less than the maximum number of terminals supported by the cell when the terminal requests access, and if so, send a determination signal to the access determining module 420, and if not, send a failure message generation signal to the message generating module 440.
The access determining module 420 is configured to, after receiving the determining signal, allocate the relevant dedicated resource to the terminal, search the cell state for the cell state setting module 430, and send a success message generation signal to the message generating module 440 when the allocation of the relevant dedicated resource to the terminal is successful and the cell state is allowed to be accessed, or send a failure message generation signal to the message generating module 440.
A cell state setting module 430, configured to calculate an output measurement value according to the scheduling request variable and the scheduling permission variable obtained through statistics, and set a cell state variable according to a size relationship between the output measurement value and the admission decision factor; and is further configured to correspondingly return the current setting value of the cell state variable when the access determining module 420 searches for the cell state.
The message generating module 440 is configured to generate an access failure message or an access success message correspondingly after receiving the failure message generating signal or the success message generating signal, and send the access failure message or the access success message to the data sending module 450.
A data sending module 450, configured to send the message to the terminal when receiving the access success message or the access failure message.
Fig. 5 is a schematic structural diagram of an apparatus for implementing admission control according to the present invention, where the apparatus may be applied to an admission control method according to the present invention as a Node B, as shown in fig. 5, the apparatus includes: a data receiving module 510, a message judging module 520, an access judging module 530, a resource allocating module 540, a cell state setting module 550, a message generating module 560 and a data transmitting module 570; wherein,
the data receiving module 510 is configured to receive a radio link setup or reconfiguration request message sent by the RNC, and send the message to the message determining module 520 and the resource allocating module 540.
A message judging module 520, configured to judge whether the received message contains shared channel use indication information, and if the received message contains the shared channel use indication information, send a judgment signal to the access judging module 530; if the information is not contained, an allocation control signal is sent to the resource allocation module 540. The allocation control signal is used to control the resource allocation module 540 to perform corresponding resource allocation according to the message.
An access determining module 530, configured to query the cell state setting module 550 for a cell state variable after receiving the determining signal, send an allocation control signal to the resource allocating module 540 when the returned cell state variable is access-allowed, and send a failure message generating signal to the message generating module 560 when the cell state variable is access-denied.
The resource allocation module 540 is configured to perform corresponding resource allocation after receiving the message and the allocation control signal, and then send a successful message generation signal to the message generation module 560.
A cell state setting module 550, configured to calculate an output measurement value according to the scheduling request variable and the scheduling permission variable obtained through statistics, and set a cell state variable according to a size relationship between the output measurement value and the admission decision factor; and is further configured to correspondingly return the current setting value of the cell state variable when the access determining module 530 searches for the cell state.
The message generating module 560 is configured to generate a corresponding radio link setup success message or reconfiguration success message, or a radio link setup failure message or reconfiguration failure message, after receiving the signal, and send the message to the data sending module 570.
A data sending module 570, configured to send the message to a corresponding RNC after receiving the message.
The cell state setting module shown in fig. 4 and 5 may also be composed of four modules, as shown in fig. 6, including: the device comprises a quantity counting module 610, a calculating module 620, a setting module 630 and an information interaction module 640; wherein,
the quantity counting module 610 is configured to count the number of scheduling requests and scheduling grants in a counting period, and send the quantity information to the calculating module 620 when the counting period arrives.
And a calculating module 620, configured to calculate an output measurement value according to the quantity information, and send the calculated output measurement value to a setting module 630.
A setting module 630, configured to determine whether the output measurement value is not less than the admission decision factor, if so, set the cell state variable as allowed access, and if not, set as denied access.
And the information interaction module 640 is configured to return the current value of the cell state variable to the corresponding module when the corresponding module queries the cell state variable. The corresponding module is an access judging module 420 in fig. 4, and an access judging module 530 in fig. 5.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (16)
1. An admission control method, characterized in that the method comprises:
when the terminal accesses, determining whether the connected terminal number of the cell accessed by the terminal is less than the maximum terminal number of the cell, determining whether the terminal can access the cell according to the cell state corresponding to the cell,
the method for setting the cell state variable comprises the following steps: counting the number of scheduling requests and scheduling allowances in a counting period, and calculating and outputting a measured value according to the number when the counting period is up; comparing the output measurement value with an admission control factor, and setting a cell state variable to allow access if the output measurement value is not less than the admission control factor; otherwise, setting the state variable of the cell as access refusal.
2. The method of claim 1, further comprising: when the terminal accesses, when the number of the connected terminals of the cell accessed by the terminal is determined to be not less than the maximum number of the terminals of the cell, the terminal is refused to access the cell.
3. The method of claim 1, further comprising: and determining whether the terminal can access the cell according to the cell state corresponding to the cell and the condition of distributing relevant special resources for the terminal.
4. The method according to claim 3, wherein determining whether the terminal can access the cell according to the situation of allocating the relevant dedicated resource to the terminal and the cell status of the cell specifically comprises:
when the radio network controller RNC successfully distributes related special resources for the terminal and the RNC determines that the cell state is allowed to be accessed according to the cell state variable, the terminal is admitted to be accessed to the cell; otherwise, rejecting the terminal to access the cell.
5. The method of claim 3, wherein after determining that the number of connected terminals in the cell accessed by the terminal is less than the maximum number of terminals in the cell, the method further comprises:
according to the first access or the re-access of the terminal, the RNC correspondingly sends a wireless link establishment or reconfiguration request message to the base station Node B; and, the message includes shared channel use indication information.
6. The method of claim 5, further comprising:
node B receives the message, and determines that the message contains shared channel use indication information, then determines the state of the cell according to the state variable of the cell, if the state of the cell is determined to be allowed to access, then Node B allocates corresponding resources for the terminal according to the message, and then correspondingly returns a message of successful establishment of a wireless link or successful reconfiguration to RNC; if the cell state is determined to be access refusal, the Node B correspondingly returns a message of radio link establishment failure or reconfiguration failure to the RNC.
7. The method of claim 5 or 6, wherein after determining that the number of connected terminals in the cell accessed by the terminal is less than the maximum number of terminals in the cell, the method further comprises:
the RNC allocates relevant dedicated resources to the terminal.
8. The method according to claim 6, wherein determining whether the terminal can access the cell according to the situation of allocating the relevant dedicated resource to the terminal and the cell state corresponding to the cell specifically includes: when the message that the establishment of the wireless link is successful or the reconfiguration is successful is received and the relevant special resources are successfully distributed, allowing the terminal to access the cell; and if not, rejecting the terminal to access the cell.
9. The method according to claim 1, wherein said calculating an output measurement is in particular:
wherein eta ismeasureFor outputting the measured value, M is the number of scheduling requests in a statistical period, N is the number of scheduling allowables in a statistical period, N represents that the statistical period is N TTIs, j represents the serial numbers of all TTIs in a statistical period, NjRepresents the scheduling allowance number, M, in the jth TTI in the statistical periodjIndicating the number of scheduling requests in the jth TTI in the counting period.
10. The method of claim 9, wherein after calculating the output measurement, the setting method further comprises:
and smoothing the output measurement value:
ηi＝f·ηi-1+(1-f)·ηmeasure
wherein eta isiIs the smoothed output measurement value, eta, corresponding to the ith statistical periodi-1Is the output measured value after the smoothing processing corresponding to the i-1 th statistical period, i is an integer not less than 1 and eta00, f is the smoothing factor.
11. An apparatus for implementing admission control, the apparatus comprising: the system comprises a terminal number judging module, an access judging module, a cell state setting module, a message generating module and a data sending module; wherein,
the terminal number judging module is used for determining to send a judging signal to the access judging module or send a failure message generating signal to the message generating module according to whether the number of terminals connected in a cell corresponding to a device to which the terminal belongs is less than the maximum terminal number supported by the cell when the terminal requests to access;
the access judgment module is used for distributing relevant special resources for the terminal after receiving the judgment signal and searching the cell state to the cell state setting module; when the cell state is allowed to be accessed and the terminal is successfully allocated with the relevant special resources, a success message generation signal is sent to a message generation module; when the cell state is that access is refused or the allocation of relevant special resources to the terminal fails, a failure message generation signal is sent to a message generation module;
the cell state setting module is used for correspondingly returning the current setting value of the cell state variable when the access judging module searches the cell state;
the message generating module is used for correspondingly generating an access failure message or an access success message and sending the access failure message or the access success message to the data sending module after receiving the failure message generating signal or the success message generating signal;
and the data sending module is used for sending the message to the terminal when receiving the access success message or the access failure message.
12. The apparatus of claim 11, wherein the cell status setting module is further configured to: and calculating an output measurement value according to the scheduling request variable and the scheduling permission variable obtained by statistics, and correspondingly setting a cell state variable according to the magnitude relation between the output measurement value and the admission judgment factor.
13. The apparatus of claim 12, wherein the cell status setting module comprises: the device comprises a quantity counting module, a calculating module, a setting module and an information interaction module; wherein,
the quantity counting module is used for counting the scheduling requests and the scheduling allowed quantity in a counting period and sending the quantity information to the calculating module when the counting period is up;
the calculation module is used for calculating an output measurement value according to the quantity information and sending the calculated output measurement value to the setting module;
the setting module is used for setting the state variable of the cell as the permission access or the rejection access according to whether the output measured value is not less than the admission judgment factor;
and the information interaction module is used for returning the current set value of the cell state variable to the access judgment module when the access judgment module inquires the cell state variable.
14. An apparatus for implementing admission control, the apparatus comprising: the system comprises a data receiving module, a message judging module, an access judging module, a resource allocation module, a cell state setting module, a message generating module and a data sending module; wherein,
the data receiving module is used for receiving a wireless link establishment or reconfiguration request message sent by the RNC and then sending the message to the message judging module and the resource allocation module;
the message judging module is used for determining to send a judging signal to the access judging module or send an allocation control signal to the resource allocation module according to whether the received message contains shared channel use indication information;
the access judging module is used for searching the cell state from the cell state setting module after receiving the judging signal, and sending an allocation control signal to the resource allocation module when the cell state is allowed to be accessed; when the cell state is access refusal, a failure message generation signal is sent to a message generation module;
the resource allocation module is used for carrying out corresponding resource allocation after receiving the message and the allocation control signal, and then sending a successful message generation signal to the message generation module;
the cell state setting module is used for correspondingly returning the current setting value of the cell state variable when the access judging module inquires the cell state variable;
a message generating module, configured to generate a corresponding radio link establishment success message or reconfiguration success message, or a radio link establishment failure message or reconfiguration failure message after receiving the signal, and send the message to a data sending module;
and the data sending module is used for sending the message to the corresponding RNC after receiving the message.
15. The apparatus of claim 14, wherein the cell status setting module is further configured to: and calculating an output measurement value according to the scheduling request variable and the scheduling permission variable obtained by statistics, and correspondingly setting a cell state variable according to the magnitude relation between the output measurement value and the admission judgment factor.
16. The apparatus of claim 15, wherein the cell status setting module comprises: the device comprises a quantity counting module, a calculating module, a setting module and an information interaction module; wherein,
the quantity counting module is used for counting the scheduling requests and the scheduling allowed quantity in a counting period and sending the quantity information to the calculating module when the counting period is up;
the calculation module is used for calculating an output measurement value according to the quantity information and sending the calculated output measurement value to the setting module;
the setting module is used for setting the state variable of the cell as the permission access or the rejection access according to whether the output measured value is not less than the admission judgment factor;
and the information interaction module is used for returning the current set value of the cell state variable to the access judgment module when the access judgment module inquires the cell state variable.
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