CN102404778A - Load estimation method - Google Patents
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- CN102404778A CN102404778A CN2010102855345A CN201010285534A CN102404778A CN 102404778 A CN102404778 A CN 102404778A CN 2010102855345 A CN2010102855345 A CN 2010102855345A CN 201010285534 A CN201010285534 A CN 201010285534A CN 102404778 A CN102404778 A CN 102404778A
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Abstract
The invention provides a load estimation method. Based on the characteristic that a load is closely related to the occupancy rate of time-frequency resources of a long term evolution (LTE) system, a load ratio in a certain transmission direction is calculated according to bit rate required by accepted service closely related to the occupancy rate of the time-frequency resources and the maximum bit rate currently borne by the system, so that the estimation on the load in a certain direction of the LTE system is realized.
Description
Technical field
The present invention relates to the load evaluation technology in the mobile communication, particularly relate to the load estimating and measuring method in Long Term Evolution (LTE) system.
Background technology
At present, in LTE systematic research implementation procedure, a lot of radio resource management function modules all need be assessed the load state of LTE system, carry out rational algorithm design according to the size of load then.For example, admit the load state of control module needs assessment system, according to the size of system's surplus resources, rational judgement is made in the admittance request of customer service then with the professional resource that requires of request admittance; When system's generation overload conditions, admit control module to transship processings according to service feature to the business of having admitted, help system is recovered normally.Load balancing module need be to the load state of this sub-district, and especially the load state of cell edge is made assessment, to the loading condition of adjacent sub-district, confirms the switching of edge customer between the sub-district then.The downlink interference collaboration module also need be measured to cell edge high power user's load when carrying out downlink interference collaboration, in order to confirm the allocation proportion of high power PRB.
In the LTE standard agreement; Load to system; Defined the qualitative explanation of several kinds of load conditions such as low load, middle load, high capacity, overload, but the evaluates calculation method that is not directed against load defines, can't quantize estimation to the load of LTE system like this.Different algorithms adopts different load evaluation methods when the function of accomplishing separately, will cause the uncertain of system loading conditions assessment, influences the cooperation between the mutual and LTE system module between the algorithm.
Equally; Different equipment vendors adopt different computational methods when system load is assessed, cause the differentiation of load state assessment; So just have influence on the inconsistent of the mutual minizone load information of X2 interface, cause the cooperation of minizone and cooperation deviation to occur.
Design performance and stability that the accuracy of load estimation and change frequency can have influence on respective algorithms; In order to accomplish the smooth exploitation of LTE system function module; Improve the close fit between each functional module simultaneously; Strengthen the information interaction accuracy of minizone, be necessary to propose a kind of unified load estimating and measuring method.
The load estimating and measuring method of traditional 3-G (Generation Three mobile communication system) is to propose to code division multiple access system.And code division multiple access system is a kind of interference-limited system, and in this system, each user has used all running time-frequency resources simultaneously; Sign indicating number according to different comes user's data is carried out receiving demodulation; Along with the increase of number of users, the increase of traffic load, the phase mutual interference between the user just increases; User's signal to noise ratio just descends, so the method for measurement system load is most and admit factors such as total number of users, base station transmitting power, total interference power, signal to noise ratio closely related.For example, number of patent application is: proposed a kind of load evaluation method to base station transmitting power in a kind of wireless communication system acceptance controlling method of 200410027171.X, come the load of system is calculated; Number of patent application is: the method and apparatus of a kind of adaptive admission control of 200610103570.9, the load state to system has carried out computational analysis from aspects such as uplink interference power and down transmitting powers respectively.
For the LTE system that adopts the OFDM technology, all users share common running time-frequency resource, and different users can not take the transmission that identical running time-frequency resource carries out data, and the situation of phase mutual interference can not take place between the user in the sub-district like this.In this sense; The LTE system is a kind of running time-frequency resource limited systems; The method of weighing system load is main relevant with the running time-frequency resource occupancy (being the PRB occupancy) of system, and like this, the load estimating and measuring method of traditional 3G system is just no longer suitable for the LTE system.
The load estimating and measuring method of a kind of LTE of being applicable to system is not proposed at present as yet.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of load estimating and measuring method, and this method is applicable to the LTE system.
In order to achieve the above object, the technical scheme of the present invention's proposition is:
A kind of load estimating and measuring method, said method are used for long evolving system and specify the load estimation in the transmission direction, and said transmission direction is upstream or downstream, and this method may further comprise the steps:
Bit rate summation BR in a, the current said transmission direction that can bear of computing system
Total
All professional demand bit rate summation BR in b, the current said transmission direction of having admitted of computing system
Used
C, the duty ratio value L according to
in the said transmission direction of calculating.
In sum; The load estimating and measuring method that the present invention proposes; To closely related these characteristics of the running time-frequency resource occupancy of its load and system in the LTE system; Utilize and the current maximum bit rate that can bear of running time-frequency resource occupancy needed bit rate of closely-related admission service and system, calculate the duty ratio value in a certain transmission direction, thereby realize the estimation of the load on a certain direction in the LTE system.
Description of drawings
Fig. 1 is the schematic flow sheet of one embodiment of the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing and specific embodiment that the present invention is done to describe in detail further below.
Defined two kinds of types of service in the LTE system, a kind of is that GBR is professional, and another kind is that Non-GBR is professional.Agreement has been confirmed a bit rate that needs satisfy to the GBR business; Promptly guarantee bit rate; Because being some bit rates, the GBR business changes business more stably; Protocol definition is when satisfying the assurance bit rate of professional correspondence, and 98% grouping can both obtain time delay to be satisfied, thereby can ensure its QoS.Yet concerning the Non-GBR with data burst characteristic is professional; Agreement has only defined the requirement of time delay and packet loss rate; There is not bit speed to carry out requirement; Although this business is not very high to the requirement of time delay, whether be met in order to reflect its QoS, still need come the appropriate bit rate ABR of its demand is added up estimation through time delay and packet loss rate.
Through to carrying out simulation analysis behind the different Non-GBR business models; Find that the professional QoS satisfaction of Non-GBR (packet delay or Loss Rate do not surpass the activity ratio upper limit of protocol definition) improves along with the increase of the bit rate of distributing, but resource utilization descends thereupon but.This explanation; Professional QoS satisfaction and resource utilization ratio are a pair of conflicting variablees; In order to improve professional QoS, just having to wastes certain system resource, and will improve usage factor of system resource; Just have to reduce professional QoS satisfaction, the reason that this phenomenon occurs derives from the professional data burst of Non-GBR.So professional for Non-GBR, the bit rate of its distribution should be taken all factors into consideration its QoS of survice and ensure and resource utilization ratio, gets a compromise between the two.
Emulation finds simultaneously, along with the increase of Non-GBR business load, when reaching identical QoS satisfaction; The bit rate of service needed is but descending, and resource utilization is improving, and this is because a large amount of Non-GBR is professional; Its data burst occurs at different time point; Cause to use each other between the different business " free time " resource of distribution, make the resource utilization of whole LTE system be improved, cause the bit rate of business demand to descend.
Based on above-mentioned to the characteristics of LTE system and the analysis of simulation result; Core concept of the present invention is: based on realizing the estimation of load with closely-related two parameters of running time-frequency resource occupancy; Promptly confirm system's current maximum bit rate that can bear of the needed bit rate summation of admission service and system, the result that the ratio of the two is estimated as system load.Wherein, System the needed bit rate summation of admission service through the calculating of the professional and needed separately bit rate summation of GBR business to the Non-GBR that admitted respectively; When the bit rate of the Non-GBR service needed of having admitted is calculated, adopt and carry out the emulation statistics on the certain user satisfaction percent basis based on packetization delay or packet loss rate, so can reflect the real resource demand that this is professional; Simultaneously; When the professional bit rate demand summation of Non-GBR is calculated, adjust with parameter beta based on the load state that Non-GBR is professional, from just proofreading and correct more accurately to the business demand of system.
Fig. 1 is the schematic flow sheet of the embodiment of the invention one.It is as shown in Figure 1,
A kind of load estimating and measuring method, this method are used for long evolving system and specify the load estimation in the transmission direction, and said transmission direction is upstream or downstream, may further comprise the steps:
Bit rate summation BR in step 101, the current said transmission direction that can bear of computing system
Total
This step can take following method to realize:
The average transmission significant bit of the said transmission direction unit's of attending running time-frequency resource (PRB) is counted P in the statistics current preset measurement period
Average
According to BR
Total=N
PRB* P
Average/ T calculates said BR
Total, wherein, N
PRBBe the running time-frequency resource occupancy of the said transmission direction that comprises in preset every frame, T is the duration of a frame, and concrete value is 10 milliseconds.
Further, for the scene of CONSIDERING EDGE user and central user, or the scene of consideration high power frequency band and low-power frequency band, can adopt following method performing step 101, to improve in the above-mentioned scene to BR
TotalThe accuracy of calculating:
In the statistics current preset measurement period in the said transmission direction average transmission significant bit of the PRB of unit of central user or low-power frequency band count P
Average-centerThe average transmission significant bit of the PRB of unit of said transmission direction top edge user or high power frequency band is counted P in the statistics current preset measurement period
Average-edge
According to BR
Total=(N
PRB-center* P
Average-center+ N
PRB-edge* P
Average-edge)/T calculates said BR
Total, N wherein
PRB-centerBe the running time-frequency resource quantity that transmission direction central user described in preset every frame or low-power frequency band are planned, N
PRB-edgeBe the running time-frequency resource quantity that transmission direction edge customer described in preset every frame or high power frequency band are planned, T is the duration of a frame.
Said preset measurement period in the said method, preferable, be some frames; When the frame that is comprised for a long time, can improve the accuracy of calculating, but complexity can increase; When the frame that is comprised after a little while, then be prone to realize, but can reduce the accuracy of result of calculation; Those skilled in the art can be provided with suitable value according to actual needs, repeat no more at this.
All professional demand bit rate summation BR in step 102, the current said transmission direction of having admitted of computing system
Used
Particularly, this step can adopt following step to realize:
The said transmission direction that step 1021, statistical system have been admitted guarantees the demand bit rate summation that bit rate (GBR) is professional
Wherein, GBR
iRepresent in the said transmission direction demand bit rate that i GBR is professional, M is the professional quantity of GBR in the said transmission direction of the current admittance of system.
Here need to prove that for GBR is professional, comprises one in its QoS index and guarantee bit rate parameters, this parameter has promptly reflected the professional demand bit rate of GBR, therefore, the GBR here
iValue promptly confirm by the assurance bit rate parameters in the professional QoS index of i GBR.
Step 1022, confirm the professional demand bit rate summation of the non-assurance bit rate of said transmission direction (Non-GBR) that system admitted through emulation
ABR
jRepresent in the said transmission direction demand bit rate that j Non-GBR is professional, N is the professional quantity of Non-GBR in the said transmission direction of the current admittance of system, and β is the professional demand bit rate adjustment factor of Non-GBR, 0＜β＜1.
Here, ABR
jCan adopt following method to confirm:
Professional for each Non-GBR, confirm under the situation that satisfies preset traffic packets time delay satisfaction or preset packet loss rate the professional needed demand bit rate ABR of this Non-GBR through emulation
j
β can adopt following method to confirm:
Through emulation; Confirm when Non-GBR in the said transmission direction of having admitted in the system professional reach N the time, the value of β under the professional situation that satisfies the traffic packets time delay satisfaction preset or preset packet loss rate of Non-GBR in all said transmission directions.
Here need to prove; In practical application; Along with the increase of the Non-GBR of system total business volume, the professional demand bit rate of Non-GBR descends accordingly to some extent, therefore; Here introduced the adjustment parameter beta; This value is between 0 and 1, and this value will reduce along with the increase of Non-GBR number of services, so that
more can embody in the practical application exactly; Under the situation of certain Non-GBR total business volume, the professional demand bit rate summation of said transmission direction Non-GBR that system has admitted.
Can find out that through above-mentioned analysis this step can obtain the professional demand bit rate summation of all Non-GBR in the said transmission direction exactly through based on the emulation of satisfying under preset traffic packets time delay satisfaction or the preset packet loss rate
Thereby can accurately obtain all professional demand bit rate summation BR in the said transmission direction
Used
Step 1023, according to
Calculate said BR
Used
Through this step, can obtain the duty ratio value in the current upstream or downstream transmission direction.
Further, can also adopt following step that the load state in the current said transmission direction is judged according to the duty ratio value L that is obtained after the said step 103:
Whether judge said L less than preset low load threshold, if judge that then the load of current said transmission direction is low load;
Judge that whether said L is greater than preset low load threshold and smaller or equal to preset high load threshold, if the load of then judging current said transmission direction is middle load;
Judge that whether said L is greater than preset high load threshold and smaller or equal to preset overloading threshold, if the load of then judging current said transmission direction is high capacity;
Whether judge said L greater than preset overloading threshold, be overload if then judge the load of current said transmission direction.
For each threshold values that relates in the above-mentioned judgement, can suitable value be set according to actual needs by those skilled in the art, repeat no more at this.
In sum, more than being merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. load estimating and measuring method, said method are used for long evolving system and specify the load estimation in the transmission direction, and said transmission direction is upstream or downstream, it is characterized in that, this method may further comprise the steps:
Bit rate summation BR in a, the current said transmission direction that can bear of computing system
Total
All professional demand bit rate summation BR in b, the current said transmission direction of having admitted of computing system
Used
C, the duty ratio value L according to
in the said transmission direction of calculating.
2. method according to claim 1 is characterized in that, said step a is:
The average transmission significant bit of the said transmission direction unit's of attending running time-frequency resource (PRB) is counted P in the statistics current preset measurement period
Average
According to BR
Total=N
PRB* P
Average/ T calculates said BR
Total, wherein, N
PRBBe the running time-frequency resource occupancy of the said transmission direction that comprises in preset every frame, T is the duration of a frame.
3. method according to claim 1 is characterized in that, said step a is:
In the statistics current preset measurement period in the said transmission direction average transmission significant bit of the PRB of unit of central user or low-power frequency band count P
Average-centerThe average transmission significant bit of the PRB of unit of said transmission direction top edge user or high power frequency band is counted P in the statistics current preset measurement period
Average-edge
According to BR
Total=(N
PRB-center* P
Average-center+ N
PRB-edge* P
Average-edge)/T calculates said BR
Total, N wherein
PRB-centerBe the running time-frequency resource quantity that transmission direction central user described in preset every frame or low-power frequency band are planned, N
PRB-edgeBe the running time-frequency resource quantity that transmission direction edge customer described in preset every frame or high power frequency band are planned, T is the duration of a frame.
4. method according to claim 1 is characterized in that, said step b is:
The said transmission direction that b1, statistical system have been admitted guarantees the demand bit rate summation that bit rate (GBR) is professional
Wherein, GBR
iRepresent in the said transmission direction demand bit rate that i GBR is professional, M is the professional quantity of GBR in the said transmission direction of the current admittance of system;
B2, confirm the professional demand bit rate summation of the non-assurance bit rate of said transmission direction (Non-GBR) that system admitted through emulation
ABR
jRepresent in the said transmission direction demand bit rate that j Non-GBR is professional, N is the professional quantity of Non-GBR in the said transmission direction of the current admittance of system, and β is the professional demand bit rate adjustment factor of Non-GBR, 0＜β＜1;
B3, according to
Calculate said BR
Used
5. method according to claim 4 is characterized in that, ABR among the said step b2
jDefinite method be:
Professional for each Non-GBR, confirm under the situation that satisfies preset traffic packets time delay satisfaction or preset packet loss rate the professional needed demand bit rate ABR of this Non-GBR through emulation
j
6. method according to claim 4 is characterized in that, definite method of β is among the said step b2:
Through emulation; Confirm when Non-GBR in the said transmission direction of having admitted in the system professional reach N the time, the value of β under the professional situation that satisfies the traffic packets time delay satisfaction preset or preset packet loss rate of Non-GBR in all said transmission directions.
7. method according to claim 1 is characterized in that, further comprises after the said step c:
Whether judge said L less than preset low load threshold, if judge that then the load of current said transmission direction is low load;
Judge that whether said L is greater than preset low load threshold and smaller or equal to preset high load threshold, if the load of then judging current said transmission direction is middle load;
Judge that whether said L is greater than preset high load threshold and smaller or equal to preset overloading threshold, if the load of then judging current said transmission direction is high capacity;
Whether judge said L greater than preset overloading threshold, be overload if then judge the load of current said transmission direction.
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| CN103716839A (en) * | 2012-10-09 | 2014-04-09 | 中国移动通信集团公司 | Method and apparatus for load balancing configuration among base stations, and wireless network system |
| WO2015089786A1 (en) * | 2013-12-19 | 2015-06-25 | 华为技术有限公司 | Method and apparatus for determining performance indicator of communications network |
| TWI603637B (en) * | 2016-03-11 | 2017-10-21 | 國立中山大學 | Mobile communication system and handover method thereof |
| CN112333753A (en) * | 2020-11-27 | 2021-02-05 | 中国联合网络通信集团有限公司 | Method and device for evaluating number of accessible users |
| CN112367679A (en) * | 2020-11-27 | 2021-02-12 | 中国联合网络通信集团有限公司 | Method and device for evaluating number of accessible users |
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| CN112367679A (en) * | 2020-11-27 | 2021-02-12 | 中国联合网络通信集团有限公司 | Method and device for evaluating number of accessible users |
| CN112367679B (en) * | 2020-11-27 | 2023-05-26 | 中国联合网络通信集团有限公司 | Method and device for evaluating number of accessible users |
| CN112333753B (en) * | 2020-11-27 | 2023-05-26 | 中国联合网络通信集团有限公司 | Method and device for evaluating number of accessible users |
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