CN101119131B - Method for estimating uplink load of user facility - Google Patents
Method for estimating uplink load of user facility Download PDFInfo
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- CN101119131B CN101119131B CN2007101518183A CN200710151818A CN101119131B CN 101119131 B CN101119131 B CN 101119131B CN 2007101518183 A CN2007101518183 A CN 2007101518183A CN 200710151818 A CN200710151818 A CN 200710151818A CN 101119131 B CN101119131 B CN 101119131B
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Abstract
The invention discloses a method for estimating the riser load of user equipment. The method comprises the steps as follows: calculating signal interference ratio of a computer user equipment; calculating multi path interference factor of user equipment; confirming load of user equipment basing on the multi path interference factor and the signal interference ratio. The invention utilizes the multi path information of an uplink user equipment on a WCDMA system in order to correct the traditional load estimation algorithm, thus eliminating the interference affect of the multi pathes. Load on the computer user equipment can be precisely worked out. Load estimating precision of the user equipment is improved as well as scheduled performance of an uplink HSUPA.
Description
Technical field
The present invention relates to the communications field, be specifically related to the evaluation method of UE (User Equipment, the subscriber equipment) ascending load in the treatment technology of customer service in the wireless communication system, particularly CDMA (code division multiple access) system.
Background technology
WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA)) system is based on the broadband cellular wireless communication system of CDMA, and the WCDMA system can support a greater variety of types of service and the professional transmittability of high data rate more.HSUPA (High Speed Uplink Packet Access, high speed uplink packet inserts) technology is the enhancement techniques of WCDMA system to the uplink ability.The HSUPA technology has comprised shorter TTI (Transmission Time Interval, Transmission Time Interval), scheduler based on NodeB (base station), HARQ (Hybrid Automatic Retransmission request, mix automatic repeat requests) and E-DCH (Enhanced Dedicate Channel, enhancement type special channel) key technology such as, the HSUPA system is significantly improved on the transmission performance of uplink service than traditional WCDMA version, the increase of nearly 50%-70% on power system capacity, the minimizing of 20%-55% is arranged, 50% the increase of on the user grouping calling flow, having an appointment in the delay of end-to-end grouping bag.
Be illustrated in figure 1 as the functional structure reference diagram of HSUPA system, use the WCDMA system of HSUPA technology, comprised RNC (Radio Network Controller, radio network controller), Node B and UE.Wherein comprised some sub-districts (Cells) among the Node B, the sub-district is to be the common radio resources of UE service in the same area in the system, in HSUPA, by the sub-district can measuring system the ascending load degree.
Node B is that unit finishes with the sub-district to the scheduling of UE, in the HSUPA technology, the function that customer service is controlled and dispatched has been placed among the Node B, by the Scheduling Request (dispatch request) of Node B according to customer service, customer service Buffer Occupancy Status (seizure condition of buffering area), the priority level of Business Stream, the disposal ability of the uplink interference of sub-district and load and base station, different UE is sent different Grants (authorization command), UE is according to the authorization command of Node B, in the E-TFC table (Enhanced Transport Format Combination Table) of the pre-configured UE of giving of RNC, select suitable transformat to merge (Enhanced Transport Format Combination), and use this E-TFC to show pairing power excursion (Power Offset), send and the data of authorizing corresponding size to Node B.
In the HSUPA technology, authorize and be divided into AG (Absolute Grants, absolute grant) and RG (RelativeGrants, relative authorization), AG has specified the absolute size that allows the data volume pairing transmitting power ratio that UE can send, and RG has specified and has allowed the relative size that UE can the transmitting power ratio, this relative size is to express with the mode of step-length, and its value can be UP (improving the scheduling amount of a step-length), DOWN (reducing the scheduling amount of a step-length) and HOLD (keeping existing scheduling amount).
The WCDMA system is a multi-user's a cdma wireless system, because in the sub-district of WCDMA system, the time of up UE emission is asynchronous, caused the nonorthogonality of up send channel between the different UEs, also just caused up the interfering with each other of transmitting of different UEs, therefore exist up UE send channel number many more in the sub-district, or the transmitting power of UE is big more, the uplink interference of system is just big more.
The operation of WCDMA system must be controlled each UE ascending load L, ascending load is remained within the rational load-threshold, otherwise system will collapse because of the power ramp of disturbing overload to cause or serious problems such as a large amount of UE call drops.
Therefore, in high speed uplink packet access (HSUPA) business, scheduler is for the effectively generation of control uplink interference overload, and the base station need be dispatched the operable ascending load resource of each UE, so that allow each UE according to the predetermined more reasonable ascending wireless resource that utilizes more fully of rule.
UE ascending load L
iThe accuracy of estimation has considerable influence to the performance of scheduler, and the accuracy of UE load depends on SIR
iThe accuracy of estimation.The WCDMA system that organizes to set up with 3GPP is an example, and in the business of R99 and R5 version, because up spreading gain is bigger, the required power (power that antenna opening receives) of up channel demodulation is often less than the power of interference noise.The interference noise that UE signal is subjected to mainly is to be made an uproar and the interference of other other sub-district of user causes that the interference between the multipath of this UE signal itself is not in the highest flight the end of by.
Therefore, the traditional UE ascending load estimating algorithm in R99 and R5 generally includes following steps:
The first step is calculated the up reception resultant signal P of k UE
k
Second goes on foot, and calculates the interference I of the signal of k UE
k
I
k=I
Total-P
kFormula 1
Wherein, I
TotalIt is the overall noise of sub-district.
The 3rd goes on foot, and calculates the signal-to-jamming ratio of k UE.
The 4th goes on foot, and calculates the load L of k UE
k
P
k=L
kI
TotalFormula 3
L wherein
kBe the load factor of k UE, so have:
Traditional SIR algorithm for estimating and traditional UE ascending load algorithm for estimating in the above-mentioned prior art are not distinguished the phase mutual interference between each bar footpath of same UE, therefore can only just approximate establishment under the interference I in each bar footpath prerequisite that other noise N is very little relatively.
Yet in the HSUPA of R6 version business, in order to support the high speed uplink business, the power of a UE can be very big, even also bigger than noise N, just UE can take most of ascending resource like this, and its load even can surpass 0.5.The signal energy of UE is very big, because the energy that disturbs is subjected to the influence of multipath signal energy very big, so have the phase mutual interference between each bar footpath.Consider the interference between the multipath, when the load of UE is estimated, traditional SIR algorithm for estimating is improved.
Adopt the SIR algorithm for estimating after improving to determine that the step of SIR is as follows:
The first step is calculated the up reception resultant signal P of k UE
k:
K UE is in the total F bar of the receiver section of base station footpath, and wherein, the signal energy of f bar multipath is: P
F, k
Second goes on foot, and calculates the interference I of the signal of k UE
k
Calculate the interference in each footpath:
I
f=I
Tota/-P
F, kFormula 6
Wherein, I
TotalIt is the sub-district overall noise;
Calculate the interference I of the signal of k UE
k:
The 3rd goes on foot, and calculates the signal-to-jamming ratio of k UE.
The signal-to-jamming ratio substitution formula 4 that obtains is determined the UE load, but the SIR algorithm for estimating after the above-mentioned improvement is used for but producing when traditional UE load algorithm for estimating carries out load estimation bigger error.For example, distribute: noise N=1, article one footpath energy P with antenna energy
1=2, second footpath energy is P
2=3, then the actual value of SIR should be (2+3)/1=5, the load L=5/6=0.83 of corresponding UE.
The interference I in article one footpath in the demodulating process
1=P
2+ N=4, the interference I in second footpath
2=P
1+ N=3, interference ratio N is big, and the interference in two footpaths varies in size, with the SIR algorithm for estimating after the above-mentioned improvement, the SIR=5/ that obtains ((3+4)/2)=1.43, load L=0.59 and the actual value of corresponding UE differ greatly.This shows that the SIR algorithm for estimating after employing improves in R99 and R5 is used for traditional load algorithm for estimating and estimates the UE load, when signal energy is big, can bring bigger error.
Summary of the invention
The objective of the invention is to propose a kind of method that is used for estimating uplink load of user facility, in order to solve the bigger problem of estimation error that caused by the mutual interference of multipath phase in the UE load estimation that exists in the prior art.
In order to realize the foregoing invention purpose, the present invention utilizes the SIR algorithm for estimating after multipath information and the improvement, traditional UE load estimation method is revised, thereby estimated the UE load accurately, has improved estimation precision.
The present invention specifically is achieved in that
A kind of method that is used for estimating uplink load of user facility comprises:
The signal-to-jamming ratio SIR of step 1, calculating subscriber equipment
k, described SIR
kEqual the ratio of interference of the signal of the up reception resultant signal of subscriber equipment and subscriber equipment;
Step 2, calculate the many of described subscriber equipment through interference factor α
k, described α
kEqual the inverse of described subscriber equipment multipath sum in the receiver section of base station;
Step 3, utilize described SIR
kAnd α
kCalculate the load of described subscriber equipment, described load equals the signal-to-jamming ratio SIR of described subscriber equipment
kDivided by 1 with the signal-to-jamming ratio SIR of described subscriber equipment
kWith multipath interference factor α
kProduct and.
In the described method that is used for estimating uplink load of user facility, the up reception resultant signal of described subscriber equipment be subscriber equipment all multipaths in the receiver section of base station signal energy and.
In the described method that is used for estimating uplink load of user facility, the interference of the signal of described subscriber equipment is the average of subscriber equipment interference of all multipaths in the receiver section of base station;
The interference of described multipath is signal energy poor of subscriber equipment place sub-district overall noise and described multipath.
The method of the invention is utilized the multipath information of the uplink UE of WCDMA system, traditional load algorithm for estimating is revised, eliminated the influence of phase mutual interference between multipath, can calculate the load of UE accurately, improve UE ascending load estimation precision, and then improved the performance of up HSUPA scheduling.
Description of drawings
Fig. 1 is the functional structure reference diagram of HSUPA system;
Fig. 2 is for realizing the main flow chart of the method for the invention;
The schematic diagram of Fig. 3 under different SIR situations, the inventive method and conventional method being carried out emulation.
Embodiment
Basic fundamental thought of the present invention is to utilize the multipath information of the uplink UE of WCDMA system, and traditional load estimation method is revised, the problem than mistake that caused by the mutual interference of multipath phase when overcoming present UE load estimation.
Below in conjunction with the drawings and specific embodiments the method for the invention is elaborated.
Be illustrated in figure 2 as the flow chart of the inventive method, compare with traditional method, the inventive method has been considered the multipath interfere information of UE when the estimation load, and it mainly comprises the steps:
The first step is utilized the SIR algorithm for estimating after improving, and calculates the signal-to-jamming ratio SIR of UE
k
Second goes on foot, and calculates the multipath interference factor α of k UE
k
Multipath interference factor α
kComputational methods as follows:
Wherein, F is a multipath number of calculating k UE with existing method.
In the 3rd step, utilize the multipath interference factor α that obtains
kWith SIR
kCalculate the load of k UE.
The estimation that obtains in the formula 11 is L as a result
kNeed the UE that obtains exactly
kAccurate load.
According to the inventive method, the ascending load of UE is estimated in the influence that can eliminate phase mutual interference between multipath accurately.
Energy distribution on antenna is: noise N=1, and article one footpath energy P1=2, second footpath energy is P2=3, then the actual value of SIR should be (2+3)/1=5, the load L=5/6=0.83 of corresponding UE.
The energy in a so-called here footpath, the energy that has comprised these all physical channels of footpath, physical channel described here comprise, the DPCCH at frequency pilot sign place, the Dedicated Physical Data Channel DPDCH at business datum place, enhanced dedicated physical data channel E-DPDCH etc.
The interference I in article one footpath in the demodulating process
1=P
2+ N=4, the interference I in second footpath
2=P
1+ N=3, interference ratio N is big, and the interference in two footpaths varies in size.With improved SIR algorithm for estimating, the SIR=5/ that obtains ((3+4)/2)=1.43, load L=0.59 and the actual value of the UE that calculates with conventional load differ greatly, and carry out emulation in this case, and the average of the UE load of conventional method is 0.5952.And the inventive method calculates the UE load is L=SIR/ (1+SIR/2), and L=1.43/ (1+1.43/2) simulation result is 0.83, and is consistent with the real load of UE.
As shown in Figure 3, the Energy distribution on antenna is: noise N=1, article one footpath energy P
1=2, second footpath energy is P
2=3 o'clock, keep the energy proportion 3: 2 between two footpaths, keep noise energy N constant.Adjust the gross energy in two footpaths, under different SIR situations, compare the difference of the estimated value of the inventive method and conventional method by emulation.
From Fig. 3, no matter true SIR is much, and the inventive method is consistent with the real load of UE.SIR is big more, and the conventional method estimation error is just big more, and the estimation error of the inventive method is 0.
Some concrete data are as follows among Fig. 3:
SIR actual value UE load actual value the inventive method UE load conventional method UE load
0.5000 0.3333 0.3333 0.2857
1.0000 0.5000 0.5000 0.4000
1.5000 0.6000 0.6000 0.4615
2.0000 0.6667 0.6667 0.5000
2.5000 0.7143 0.7143 0.5263
3.0000 0.7500 0.7500 0.5455
3.5000 0.7778 0.7778 0.5600
4.0000 0.8000 0.8000 0.5714
4.5000 0.8182 0.8182 0.5806
5.0000 0.8333 0.8333 0.5882
From as can be seen above-mentioned, load estimation method of the present invention when SIR=5, has been eliminated the error of traditional algorithm about 24.5%.
In order to further specify effect of the present invention, describe for the example in three footpaths.Energy distribution on antenna is: noise N=1, article one footpath energy P
1=1, second footpath energy is P
2Article=2, three, the footpath energy is P
3=4, then the actual value of SIR should be (1+2+4)/1=7, the load L=7/8=0.875 of corresponding UE.
The signal-to-jamming ratio that obtains with the SIR algorithm for estimating after improving is (1+2+4)/((7+6+4)/3)=1.2353, and the load of adopting the conventional load evaluation method to calculate UE again is 1.2353/ (1+1.2353)=0.5526.The UE load that estimates with the method for the invention is 1.2353/ (1+1.2353/3)=0.875.
As can be seen, the ascending load that uses the inventive method estimation to obtain is consistent with the actual loading of UE, as can be seen, under the situation that has three footpaths, adopts load estimation method of the present invention when SIR=5, has eliminated the error of traditional algorithm about 32.3%.
Claims (3)
1. method that is used for estimating uplink load of user facility is characterized in that:
The signal-to-jamming ratio SIR of step 1, calculating subscriber equipment
k, described SIR
kEqual the ratio of interference of the signal of the up reception resultant signal of subscriber equipment and subscriber equipment;
Step 2, calculate the many of described subscriber equipment through interference factor α
k, described α
kEqual the inverse of described subscriber equipment multipath sum in the receiver section of base station;
Step 3, utilize described SIR
kAnd α
kCalculate the load of described subscriber equipment, described load equals the signal-to-jamming ratio SIR of described subscriber equipment
kDivided by 1 with the signal-to-jamming ratio SIR of described subscriber equipment
kWith multipath interference factor α
kProduct and.
2. the method that is used for estimating uplink load of user facility as claimed in claim 1 is characterized in that,
The up reception resultant signal of described subscriber equipment be subscriber equipment all multipaths in the receiver section of base station signal energy and.
3. the method that is used for estimating uplink load of user facility as claimed in claim 1 is characterized in that,
The interference of the signal of described subscriber equipment is the average of subscriber equipment interference of all multipaths in the receiver section of base station;
The interference of described multipath is signal energy poor of subscriber equipment place sub-district overall noise and described multipath.
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CN101605358B (en) * | 2009-06-29 | 2011-11-30 | 中兴通讯股份有限公司 | Uplink rate control method and system |
CN103503361B (en) * | 2013-01-24 | 2016-03-09 | 华为技术有限公司 | For controlling the method and apparatus of ascending load |
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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