CN101119131A - Method for estimating uplink load of user facility - Google Patents
Method for estimating uplink load of user facility Download PDFInfo
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- CN101119131A CN101119131A CNA2007101518183A CN200710151818A CN101119131A CN 101119131 A CN101119131 A CN 101119131A CN A2007101518183 A CNA2007101518183 A CN A2007101518183A CN 200710151818 A CN200710151818 A CN 200710151818A CN 101119131 A CN101119131 A CN 101119131A
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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 invention relates to the communication field, in particular to a User service processing technology in a wireless communication system, in particular to a method for estimating uplink load of User Equipment (UE) in a Code Division Multiple Access (CDMA) system.
Background
A WCDMA (Wideband Code Division Multiple Access) system is a CDMA-based Wideband cellular wireless communication system, and the WCDMA system can support a wider variety of service types and higher data rate service transmission capabilities. The HSUPA (High Speed Uplink packet access) technology is a technology for enhancing Uplink transmission capability of a WCDMA system. The HSUPA technology includes a shorter TTI (Transmission Time Interval), and based on key technologies such as a Node B scheduler, HARQ (Hybrid Automatic Retransmission request), and E-DCH (Enhanced dedicated Channel), the HSUPA system has a significant improvement in Transmission performance of uplink services, an increase of about 50% to 70% in system capacity, a decrease of 20% to 55% in delay of end-to-end packet, and an increase of about 50% in user packet call traffic compared to the conventional WCDMA version.
Referring to fig. 1, a functional structure of an HSUPA system is shown, and a WCDMA system using the HSUPA technology includes an RNC (Radio Network Controller), a Node B and a UE. Wherein, node B includes several Cells, the cell is the public wireless resource in the system for UE in the same area, in HSUPA, the uplink load degree of the system can be measured by the cell.
The Node B finishes the dispatching of the UE by taking a cell as a unit, the Node B puts the functions of controlling and dispatching user services in the Node B in HSUPA technology, the Node B sends different Grants (authorization commands) to different UEs according to the Scheduling Request of the user services, the occupation state of a Buffer area, the priority level of service flow, the uplink interference and the load of the cell and the processing capacity of a base station, the UE selects a proper transmission Format Combination (Enhanced Transport Format Combination) in an E-TFC Table (Enhanced Transport Format Combination Table) pre-configured to the UE by the RNC according to the authorization command of the Node B, and sends data with the size corresponding to the authorization size to the Node B by using the Power Offset (Power Offset) corresponding to the E-TFC Table.
In the HSUPA technique, grants are divided into AG (Absolute Grants) and RG (Relative Grants), where AG specifies the Absolute size of the transmit power ratio corresponding to the amount of data allowed to be sent by the UE, and RG specifies the Relative size of the transmit power ratio allowed to be sent by the UE, and the Relative size is expressed in steps, and its values may be UP (scheduling amount increased by one step), DOWN (scheduling amount decreased by one step), and HOLD (maintaining the existing scheduling amount).
The WCDMA system is a multi-user CDMA wireless system, and because the uplink UE transmission time in the cell of the WCDMA system is asynchronous, non-orthogonality of uplink transmission channels between different UEs is caused, and mutual interference of uplink transmission signals of different UEs is also caused, so the more uplink UE transmission channels exist in the cell, or the larger the UE transmission power is, the larger the uplink interference of the system is.
The WCDMA system must operate to control the uplink load L of each UE to keep the uplink load within a reasonable load threshold, otherwise the system will crash or drop a large number of UEs due to power ramp up caused by interference overload.
Therefore, in the high speed uplink packet access service, in order to effectively control the occurrence of uplink interference overload, the base station needs to schedule uplink load resources that can be used by each UE, so that each UE can more reasonably and fully utilize uplink radio resources according to a predetermined rule.
UE uplink load L i The accuracy of the estimation has a large impact on the performance of the scheduler, while the accuracy of the UE load depends on the SIR i The accuracy of the estimate. Taking the WCDMA system formulated by the 3GPP organization as an example, in the R99 and R5 versions of services, the uplink spreading gain is large, and the power (day) required for uplink channel demodulation is largeThe power received by the line port) tends to be less than the power of the interference noise. The interference noise suffered by a UE signal is mainly caused by the interference of background noise and other cells of other users, and the interference among the multipath of the UE signal is not dominant.
Therefore, the conventional UE uplink load estimation algorithm in R99 and R5 generally includes the following steps:
first, calculating the uplink received total signal P of the kth UE k ；
Second, interference I of k UE signal is calculated k ；
I k ＝I total -P k Equation 1
Wherein, I total Is the total noise of the cell.
And thirdly, calculating the signal-to-interference ratio of the kth UE.
The fourth step, calculate the load L of the kth UE k 。
P k ＝L k I total Equation 3
Wherein L is k For the load factor of the kth UE, then:
The above conventional SIR estimation algorithm and the conventional UE uplink load estimation algorithm in the prior art do not distinguish the mutual interference between the paths of the same UE, and therefore, the mutual interference between the paths is only approximately satisfied on the premise that the interference I of each path is very small compared with other noise N.
However, in the HSUPA service of the R6 version, in order to support the high-speed uplink service, the power of one UE is large, even larger than the noise N, so that the UE occupies most of the uplink resources, and the load of the UE may even exceed 0.5. The signal energy of the UE is large, and since the interference energy is greatly affected by the multipath signal energy, there is mutual interference between the paths. In consideration of interference between multipaths, a conventional SIR estimation algorithm is improved in estimating a load of a UE.
The step of determining the SIR using the improved SIR estimation algorithm is as follows:
first, calculating the uplink received total signal P of the kth UE k ：
Equation 5
The kth UE shares F paths in a receiving segment of the base station, wherein the signal energy of the F path is as follows: p is f，k ；
Second, calculating interference I of signal of kth UE k 。
Calculating the interference of each path:
I f ＝I total -P f，k equation 6
Wherein, I total Is the cell total noise;
calculating interference I of k UE signal k ：
And thirdly, calculating the signal to interference ratio of the kth UE.
The UE load is determined by substituting the obtained SIR into equation 4, but the improved SIR estimation algorithm generates a large error when used for load estimation in the conventional UE load estimation algorithm. For example, with antenna energy distribution: noise N =1, first path energy P 1 =2, second path energy P 2 =3, then the true value of SIR should be (2 + 3)/1 =5, corresponding to UE load L =5/6=0.83.
Interference of the first path during demodulation I 1 ＝P 2 + N =4, interference I of the second path 2 ＝P 1 + N =3, the interference ratio N is large, and the interference magnitudes of the two paths are different, and the improved SIR estimation algorithm is used to obtain SIR = 5/((3 + 4)/2) =1.43, and the load L =0.59 of the corresponding UE is greatly different from the true value. It can be seen that improved SIR is used in R99 and R5Estimation algorithms are used in conventional load estimation algorithms to estimate the UE load, which may cause large errors when the signal energy is large.
Disclosure of Invention
The invention aims to provide a method for estimating uplink load of user equipment, which is used for solving the problem of larger estimation error caused by multipath mutual interference in UE load estimation in the prior art.
In order to achieve the purpose, the invention utilizes multipath information and an improved SIR estimation algorithm to correct the traditional UE load estimation method, thereby accurately estimating the UE load and improving the estimation accuracy.
The invention is realized in such a way that:
a method for estimating uplink load of user equipment determines the load of the user equipment according to a signal-to-interference ratio of the user equipment and a multipath interference factor of the user equipment.
In the method for estimating the uplink load of the user equipment, the load of the user equipment is equal to the signal-to-interference ratio of the user equipment divided by 1 and the sum of the product of the signal-to-interference ratio of the user equipment and the multipath interference factor.
In the method for estimating the uplink load of the user equipment, the sir of the user equipment is obtained by comparing the calculated uplink received total signal of the user equipment with the calculated interference of the signal of the user equipment.
In the method for estimating the uplink load of the user equipment, the total uplink received signal of the user equipment is the sum of signal energy of all multipath signals of the user equipment in a receiving section of the base station.
In the method for estimating the uplink load of the user equipment, the interference of the signal of the user equipment is the average value of the interference of all multi-paths of the user equipment in a receiving section of a base station;
the interference of the multipath is the difference between the total noise of the cell where the user equipment is located and the signal energy of the multipath.
In the method for estimating the uplink load of the user equipment, the multipath interference factor is equal to the reciprocal of the total number of multipaths of the user equipment in the receiving section of the base station.
The method of the invention utilizes the multipath information of the uplink UE of the WCDMA system to correct the traditional load estimation algorithm, eliminates the influence of mutual interference among the multipath, can accurately calculate the load of the UE, improves the estimation precision of the uplink load of the UE, and further improves the performance of uplink HSUPA scheduling.
Drawings
Fig. 1 is a functional structure reference diagram of an HSUPA system;
FIG. 2 is a main flow chart of a method for implementing the present invention;
fig. 3 is a schematic diagram of simulation of the method of the present invention and the conventional method under different SIR conditions.
Detailed Description
The basic technical idea of the invention is to modify the traditional load estimation method by using the multipath information of the uplink UE of the WCDMA system, and overcome the problem of larger error caused by multipath mutual interference when the UE load is estimated at present.
The method of the present invention is described in detail below with reference to the figures and the detailed description.
As shown in fig. 2, which is a flowchart of the method of the present invention, compared with the conventional method, the method of the present invention considers the multi-path interference information of the UE when estimating the load, and mainly includes the following steps:
firstly, calculating and obtaining the signal interference ratio SIR of the UE by utilizing an improved SIR estimation algorithm k 。
Second, the multipath interference factor alpha of the kth UE is calculated k 。
Multipath interference factor alpha k The calculation method of (2) is as follows:
Wherein, F is the multipath number of the kth UE calculated by the existing method.
Thirdly, the obtained multipath interference factor alpha is utilized k And SIR k The load of the kth UE is calculated.
The estimation result L obtained in equation 11 k Is the UE that needs to be obtained k The precise load of.
According to the method, the influence of the mutual interference among the multipath can be eliminated, and the uplink load of the UE can be accurately estimated.
The energy distribution on the antenna is: noise N =1, the first path energy P1=2, and the second path energy P2=3, then the true value of SIR should be (2 + 3)/1 =5, and the load L =5/6=0.83 corresponding to UE.
The energy of one path includes the energy of all physical channels of the path, where the physical channels include DPCCH where pilot symbols are located, dedicated physical data channel DPDCH where traffic data is located, enhanced dedicated physical data channel E-DPDCH, and so on.
Interference of the first path during demodulation I 1 ＝P 2 + N =4, interference I of the second path 2 ＝P 1 + N =3, the interference ratio N is large, and the interference levels of the two paths are different. With the improved SIR estimation algorithm, the obtained SIR = 5/((3 + 4)/2) =1.43, the UE load calculated with the conventional load L =0.59, and the actual value is very different, in this case, the simulation is performed, and the UE load of the conventional method has an average value of 0.5952. And calculated by the method of the inventionThe load to the UE is L = SIR/(1 + SIR/2), and the simulation result of L = 1.43/(1 + 1.43/2) is 0.83, which is consistent with the real load of the UE.
As shown in fig. 3, the energy distribution on the antenna is: noise N =1, first path energy P 1 =2, second path energy P 2 If =3, the energy ratio between the two paths is kept at 3: 2, and the noise energy N is kept unchanged. The total energy of the two paths is adjusted, and the difference of the estimated values of the method and the traditional method is compared under the condition of different SIRs through simulation.
From fig. 3, the method of the present invention is consistent with the true load of the UE no matter how large the true SIR is. The larger the SIR, the larger the estimation error of the conventional method, whereas the estimation error of the inventive method is 0.
Some specific data in fig. 3 are as follows:
SIR true value UE load true value the method of the present invention UE load traditional 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 the above, it can be seen that the load estimation method of the present invention, at SIR =5, eliminates the error of about 24.5% of the conventional algorithm.
To further illustrate the effects of the present invention, an example of three diameters is described. On the antennaThe energy distribution of (a) is: noise N =1, first path energy P 1 =1, second path energy P 2 =2, third path energy P 3 =4, then the true value of SIR should be (1 +2+ 4)/1 =7, corresponding to UE load L =7/8=0.875.
The signal to interference ratio obtained by the improved SIR estimation algorithm is (1 +2+ 4)/((7 +6+ 4)/3) = 1.2353, and then the load of the UE is calculated to be 1.2353/(1 + 1.2353) = 0.5526 by adopting the traditional load estimation method. The estimated UE load by the method of the invention is 1.2353/(1 + 1.2353/3) =0.875.
It can be seen that the uplink load estimated by using the method of the present invention is consistent with the actual load of the UE, and it can be seen that, in the case of three paths, the error of about 32.3% of the conventional algorithm is eliminated when SIR =5 by using the load estimation method of the present invention.
Claims (6)
1. A method for estimating user equipment uplink load, characterized by:
and determining the load of the user equipment according to the calculated signal-to-interference ratio of the user equipment and the multipath interference factor of the user equipment.
2. A method for estimating user equipment uplink load according to claim 1, characterized by:
the load of the user equipment is equal to the signal-to-interference ratio of the user equipment divided by 1 and the sum of the product of the signal-to-interference ratio of the user equipment and the multipath interference factor.
3. Method for estimating the uplink load of a user equipment according to claim 1 or 2, characterized in that:
and the signal-to-interference ratio of the user equipment is obtained by comparing the calculated uplink receiving total signal of the user equipment with the calculated interference of the signal of the user equipment.
4. The method for estimating uplink load of a user equipment according to claim 3,
the total uplink receiving signal of the user equipment is the sum of signal energy of all multi-paths of the user equipment in a receiving section of the base station.
5. Method for estimating user equipment uplink load according to claim 3,
the interference of the signal of the user equipment is the average value of the interference of all multi-paths of the user equipment in a receiving section of the base station;
the interference of the multi-path is the difference between the total noise of the cell where the user equipment is located and the signal energy of the multi-path.
6. Method for estimating user equipment uplink load according to claim 1 or 2,
the multipath interference factor is equal to the inverse of the total number of multipaths in the receiving segment of the base station for the user equipment.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010145600A1 (en) * | 2009-06-29 | 2010-12-23 | 中兴通讯股份有限公司 | Method and system for controlling uplink rate |
| CN103503361A (en) * | 2013-01-24 | 2014-01-08 | 华为技术有限公司 | Method and apparatus controlling up load |
| 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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| JP2937681B2 (en) * | 1993-03-18 | 1999-08-23 | 沖電気工業株式会社 | Transmission power control method |
| AU3260195A (en) * | 1995-08-31 | 1997-03-19 | Nokia Telecommunications Oy | Method and device for controlling transmission power of a radio transmitter in a cellular communication system |
| KR100321865B1 (en) * | 1996-04-12 | 2002-03-08 | 다치카와 게이지 | Mehtod and instrument for measuring receiving sir and transmission power |
| CN1102308C (en) * | 1996-06-27 | 2003-02-26 | Ntt移动通信网株式会社 | Transmitted power controller |
| CN1132357C (en) * | 2000-08-21 | 2003-12-24 | 华为技术有限公司 | Method and device for measuring S/N ratio |
| CN1269324C (en) * | 2003-09-28 | 2006-08-09 | 中兴通讯股份有限公司 | SIR measuring method and device for WCDMA system up-link |
| CN100550703C (en) * | 2004-07-29 | 2009-10-14 | 大唐移动通信设备有限公司 | The method of sub-district volume calculation in the TD-SCDMA system |
| CN100411475C (en) * | 2004-08-12 | 2008-08-13 | 华为技术有限公司 | Up-load estimating method in mobile communication system |
| CN101127955B (en) * | 2007-08-16 | 2010-09-29 | 中兴通讯股份有限公司 | Estimation method of UE load in code division multi-address system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010145600A1 (en) * | 2009-06-29 | 2010-12-23 | 中兴通讯股份有限公司 | Method and system for controlling uplink rate |
| CN102349324A (en) * | 2009-06-29 | 2012-02-08 | 中兴通讯股份有限公司 | Method and system for controlling uplink rate |
| CN103503361A (en) * | 2013-01-24 | 2014-01-08 | 华为技术有限公司 | Method and apparatus controlling up load |
| 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 |
| 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 |
| 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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