CN102076070A - Method and device for adjusting expected received signal to noise ratio of terminal - Google Patents
Method and device for adjusting expected received signal to noise ratio of terminalDownload PDFInfo
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- CN102076070A CN102076070ACN2011100079984ACN201110007998ACN102076070ACN 102076070 ACN102076070 ACN 102076070ACN 2011100079984 ACN2011100079984 ACN 2011100079984ACN 201110007998 ACN201110007998 ACN 201110007998ACN 102076070 ACN102076070 ACN 102076070A
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- 238000012986modificationMethods0.000description2
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Abstract
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for adjusting an expected received signal-to-noise ratio of a terminal.
Background
The bandwidth of an LTE (Long Term Evolution) system is variable, and Power control can be performed based on a PSD (Power Spectral Density), so that the total transmission Power of the system can be changed along with the change of the bandwidth, thereby implementing matching between the MCS (Modulation and Coding Scheme), the bandwidth, and the total transmission Power.
The LTE system adopts an open loop and closed loop combined mode to carry out uplink power control, and the terminal determines open loop parameters based on the knowledge of the terminal on a channel and a resource allocation result, namely, the bandwidth allocated to the PUSCH by the ith subframeMPUSCH(i) Expectation after normalization of interference noiseTransmitting powerPo_PUSCH(j) Compensation factor alpha (j), downlink path loss PL estimated from downlink reference symbols, and power compensation delta derived from transmission efficiencyTF(i). However, the estimate of PL for the terminal may not be accurate, and therefore the base station may make closed loop adjustments to the terminal transmit power based on the expected and actual received quality of the signal.
Specifically, the base station determines the MCS of the current transmission according to the terminal resource allocation result, and obtains the cell-level PUSCH expected received signal-to-noise ratio according to the MCS table lookup, that is, the expected received signal-to-noise ratio of the current transmissionSINRTargetAnd obtaining the received SNR of the last uplink transmission from the physical layerSINRRECVQuantization ofSINRTargetAndSINRRECVand quantizes the value deltaPUSCHInforming the terminal through the downlink signaling, the terminal obtaining the current uplink transmission power dynamic deviation value through analyzing the signaling, that is, the base station adjusting the terminal transmission power based on the uplink signal receiving qualityf(i). The terminal determines the transmitting power according to the open-loop parameter and the dynamic deviation value, compares the magnitude relation between the transmitting power and the maximum transmitting power allowed by the terminal, and selects the smaller value of the transmitting power and the maximum transmitting power as the final transmitting power, as shown in the formula [1 ]]Shown in the figure:
PPUSCH(i)=min｛PCMAX,10log10(MPUSCH(i))+ Po_PUSCH(j)+α（j）·PL+△TF(i)+ f(i)｝[dBm]
……………………[1]
wherein,PPUSCH(i) Is the PUSCH transmit power of the ith uplink subframe of the terminal,PCMAXis the maximum transmit power allowed by the terminal,α（j）·PLis to compensate the path loss in the transmission process.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
the cell-level PUSCH expected received signal-to-noise ratio is a cell-level parameter obtained by simulation on the premise of maximizing system throughput, and a system simulation scene is different from an actual terminal transmission scene, so that the cell-level PUSCH expected received signal-to-noise ratio is different from the signal-to-noise ratio required by the terminal for transmitting the current service, and the quality of the uplink transmission service of the terminal after closed-loop power control cannot meet the expected requirement.
Specifically, when the expected receiving signal-to-noise ratio of the PUSCH at the cell level is lower than the signal-to-noise ratio required by the terminal for transmitting the current service, the receiving signal-to-noise ratio of the PUSCH at the terminal after the closed-loop power control adjustment is close to the expected receiving signal-to-noise ratio at the cell level and lower than the signal-to-noise ratio required by the terminal for transmitting the current service, which causes a block error rate affecting the service quality in uplink, and the base station cannot adjust any more, so that the service transmission quality is further deteriorated. When the expected received signal-to-noise ratio of the PUSCH at the cell level is higher than the signal-to-noise ratio required by the terminal for transmitting the current service, the received signal-to-noise ratio of the PUSCH at the terminal after closed loop power control adjustment is close to the expected received signal-to-noise ratio at the cell level and is higher than the signal-to-noise ratio required by the terminal for transmitting the current service, thereby wasting transmission power and causing interference to adjacent cells.
Disclosure of Invention
The invention aims to provide a method and a device for adjusting an expected receiving signal-to-noise ratio of a terminal so as to avoid failure of uplink closed loop power control, and the technical scheme adopted by the invention is as follows:
a method of adjusting an expected received signal-to-noise ratio of a terminal, comprising:
and the base station determines the error rate of the terminal and adjusts the expected receiving signal-to-noise ratio of the terminal according to the error rate of the terminal.
A base station, comprising:
the error rate determining module is used for determining the error rate of the terminal;
and the adjusting module is used for adjusting the expected receiving signal-to-noise ratio of the terminal according to the error rate of the terminal.
The embodiment of the invention has the advantages that the expected receiving signal-to-noise ratio of the terminal is adjusted according to the monitored uplink service transmission information of the terminal, so that the expected signal-to-noise ratio of the terminal approaches to the signal-to-noise ratio required by the terminal for transmitting the current service, the uplink closed loop power control failure can be effectively prevented, and the generation of power control dead angles is avoided. Of course, it is not necessary for any product that implements an embodiment of the invention to achieve all of the above-described advantages at the same time.
Drawings
Fig. 1 is a flowchart of a method for improving an expected received signal-to-noise ratio of a terminal according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for reducing an expected received signal-to-noise ratio of a terminal according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a base station in an embodiment of the present invention.
Detailed Description
In the technical scheme provided by the embodiment of the invention, the base station can monitor the uplink service transmission quality of the terminal and dynamically adjust the expected receiving signal-to-noise ratio of the terminal according to the monitoring result. Specifically, the base station may use the current expected received snr of the terminal as a reference value, obtain a dynamic offset value according to a monitoring result of the uplink service transmission quality of the terminal, and use the accumulation of the reference value and the dynamic offset value as the adjusted expected received snr of the terminal. In the above dynamic adjustment process, an adjustment step length and an adjustment threshold may be set.
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, a flowchart of a method for improving an expected received signal-to-noise ratio of a terminal in the embodiment of the present invention includes the following steps:
Specifically, after the cell is established, the base station may monitor the uplink service transmission quality of each terminal in the cell, and count uplink service transmission information of the terminal, where the uplink service transmission information of the terminal may include the number of data blocks cumulatively transmitted by the terminal, the bit error rate of the terminal, and the number of times that the actual received signal-to-noise ratio of the terminal approaches the expected received signal-to-noise ratio of the terminal. The number of times that the actual receiving signal-to-noise ratio of the terminal approaches the expected receiving signal-to-noise ratio of the terminal is the number of times that the absolute value of the difference between the actual receiving signal-to-noise ratio of the terminal and the expected receiving signal-to-noise ratio of the terminal is smaller than or equal to a preset value.
Specifically, if the bit error rate of the terminal is greater than or equal to ErrorBlockUpthresholdIf the current expected received signal-to-noise ratio of the terminal is determined to be too low, the terminal needs to be improvedAn expected received signal-to-noise ratio; otherwise, it is determined that the desired received signal-to-noise ratio of the terminal does not need to be improved.
Andstep 107, the base station empties the uplink service transmission information obtained by statistics.
It should be noted that afterstep 107 is executed,step 101 may be executed continuously. N in the above-mentioned embodimentblock、UpClosethreshold、ErrorBlockUpthreshold、UPstepAnd RamupthresholdThe device can be a preset fixed value and can also be dynamically adjusted according to requirements.
In addition, the execution sequence of theabove step 102 andstep 103 can be interchanged, that is, the number of times that the base station determines that the actual received signal-to-noise ratio of the terminal is close to the expected received signal-to-noise ratio of the terminal is not less than the UpClosethresholdThen, judging whether the quantity of the data blocks accumulatively transmitted by the terminal is not less than NblockThe object of the invention can be achieved as well.
In addition,step 102 andstep 103 in the embodiment of the present invention are preferred steps, and by determining a relationship between the number of data blocks that are cumulatively transmitted by the terminal, the number of times that the actual receiving signal-to-noise ratio of the terminal approaches the expected receiving signal-to-noise ratio of the terminal, and a preset value, the adjusted expected receiving signal-to-noise ratio of the terminal can approach the signal-to-noise ratio required by the terminal to transmit the current service; in other embodiments of the present invention,step 102 andstep 103 may not be executed, and accordingly, the base station may count only the error rate of the terminal and adjust the expected received signal-to-noise ratio of the terminal according to the error rate of the terminal, which may also achieve the object of the present invention.
The embodiment of the invention has the following advantages that because the expected receiving signal-to-noise ratio of the terminal is adjusted according to the monitored uplink service transmission information of the terminal, the adjusted expected receiving signal-to-noise ratio of the terminal approaches to the signal-to-noise ratio required by the terminal for transmitting the current service, the problem of uplink closed loop power control failure can be effectively prevented, the generation of power control dead angles is avoided, the uplink signal receiving quality of the terminal is improved, and the system throughput is improved. Of course, it is not necessary for any product that implements an embodiment of the invention to achieve all of the above-described advantages at the same time.
In the above embodiment, the base station improves the expected received signal-to-noise ratio of the terminal according to the uplink service transmission information of the terminal; in the embodiment of the invention, the base station can also reduce the expected receiving signal-to-noise ratio of the terminal according to the uplink service transmission information of the terminal.
As shown in fig. 2, a flowchart of a method for reducing an expected received signal-to-noise ratio of a terminal in the embodiment of the present invention includes the following steps:
Specifically, if the bit error rate of the terminal is less than or equal to ErrorBlockDownthresholdThen it is determined that the current expected received signal-to-noise ratio of the terminal is too high, and the terminal's expectation needs to be reducedReceiving a signal-to-noise ratio; otherwise, it is determined that the desired received signal-to-noise ratio of the terminal does not need to be reduced.
Instep 206, the base station lowers the desired received SNR of the terminal by Downstep。
It should be noted that afterstep 207 is executed,step 201 may be executed continuously. N in the above-mentioned embodimentblock、DownClosethreshold、ErrorBlockDownthreshold、DownstepAnd RamdownthresholdThe device can be a preset fixed value and can also be dynamically adjusted according to requirements.
In addition, the execution sequence ofstep 202 and step 203 can be interchanged, that is, the base station determines that the actual received signal-to-noise ratio of the terminal is close to the expected received signal-to-noise ratio of the terminal not less than the downlink closethresholdThen, judging whether the quantity of the data blocks accumulatively transmitted by the terminal is not less than NblockThe object of the invention can be achieved as well.
In addition,step 202 and step 203 in the embodiment of the present invention are preferred steps, and the relationship between the number of data blocks accumulated and transmitted by the terminal, the number of times that the actual receiving signal-to-noise ratio of the terminal approaches the expected receiving signal-to-noise ratio of the terminal, and the preset value is determined, so that the adjusted expected receiving signal-to-noise ratio of the terminal approaches the signal-to-noise ratio required by the terminal to transmit the current service; in other embodiments of the present invention,step 202 and step 203 may not be executed, and accordingly, the base station may count only the error rate of the terminal and adjust the expected received signal-to-noise ratio of the terminal according to the error rate of the terminal, which may also achieve the object of the present invention.
The embodiment of the invention has the following advantages that because the expected receiving signal-to-noise ratio of the terminal is adjusted according to the monitored uplink service transmission information of the terminal, the adjusted expected receiving signal-to-noise ratio of the terminal approaches to the signal-to-noise ratio required by the terminal for transmitting the current service, the problem of uplink closed loop power control failure can be effectively prevented, the generation of power control dead angles is avoided, the transmitting power of the terminal is reduced on the premise of ensuring the uplink receiving quality, the interference to the adjacent cell is prevented, and the transmission efficiency is improved. Of course, it is not necessary for any product that implements an embodiment of the invention to achieve all of the above-described advantages at the same time.
According to the method for adjusting the expected received signal-to-noise ratio of the terminal provided in the foregoing embodiment, an embodiment of the present invention further provides a device that applies the method for adjusting the expected received signal-to-noise ratio of the terminal.
As shown in fig. 3, a schematic structural diagram of a base station in the embodiment of the present invention includes:
and an error rate determining module 310, configured to determine an error rate of the terminal.
An adjusting module 320, configured to adjust an expected received signal-to-noise ratio of the terminal according to the bit error rate of the terminal determined by the bit error rate determining module 310.
The adjusting module 320 is specifically configured to increase an expected received signal-to-noise ratio of the terminal when the bit error rate of the terminal is greater than or equal to a first preset value; and when the error rate of the terminal is less than or equal to a second preset value, reducing the expected received signal-to-noise ratio of the terminal, wherein the second preset value can be less than the first preset value.
Specifically, the adjusting module 320 may increase the expected snr of the terminal by a third preset value when the absolute value of the difference between the expected snr of the terminal and the expected snr of the cell level is smaller than or equal to a fourth preset value after the expected snr of the terminal is increased by the third preset value; or after the expected received signal-to-noise ratio of the terminal is reduced by the fifth preset value, the absolute value of the difference between the expected received signal-to-noise ratio of the terminal and the expected received signal-to-noise ratio of the cell level is less than or equal to the sixth preset value, and the expected received signal-to-noise ratio of the terminal is increased by the fifth preset value.
The base station may further include:
the snr determining module 330 is configured to determine a number of times that an actual received snr of the terminal approaches an expected received snr of the terminal, that is, a number of times that an absolute value of a difference between the actual received snr of the terminal and the expected received snr of the terminal is smaller than or equal to a seventh preset value. Accordingly, the adjusting module 320 may be specifically configured to increase the expected received signal-to-noise ratio of the terminal when the number of times that the actual received signal-to-noise ratio of the terminal approaches the expected received signal-to-noise ratio of the terminal is greater than or equal to a sixth preset value in the signal-to-noise ratio determining module 330; the method and the device can also be specifically used for improving the expected received signal-to-noise ratio of the terminal when the number of times that the actual received signal-to-noise ratio of the terminal approaches the expected received signal-to-noise ratio of the terminal is greater than or equal to an eighth preset value.
The base station may further include:
a data block determining module 340, configured to determine the number of data blocks that are transmitted cumulatively by the terminal. Accordingly, the adjusting module 320 is specifically configured to adjust the expected received signal-to-noise ratio of the terminal according to the error rate of the terminal when the number of the data blocks that are determined by the signal-to-noise ratio determining module 330 and are cumulatively transmitted by the terminal is greater than or equal to a ninth preset value.
The embodiment of the invention has the advantages that because the expected receiving signal-to-noise ratio of the terminal is adjusted according to the monitored uplink service transmission information of the terminal, the adjusted expected receiving signal-to-noise ratio of the terminal approaches to the signal-to-noise ratio required by the terminal for transmitting the current service, the problem of uplink closed loop power control failure can be effectively prevented, the generation of power control dead angles is avoided, the uplink signal receiving quality of the terminal is improved, and the system throughput is improved; on the premise of ensuring the uplink receiving quality, the transmitting power of the terminal is reduced, the interference to the adjacent cell is prevented, and the transmission efficiency is improved. Of course, it is not necessary for any product that implements an embodiment of the invention to achieve all of the above-described advantages at the same time.
Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for enabling a terminal device (which may be a mobile phone, a personal computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (14)
1. A method for adjusting an expected received signal-to-noise ratio of a terminal, comprising:
and the base station determines the error rate of the terminal and adjusts the expected receiving signal-to-noise ratio of the terminal according to the error rate of the terminal.
2. The method of claim 1, wherein the base station adjusting the expected received signal-to-noise ratio of the terminal based on the bit error rate of the terminal comprises:
when the error rate of the terminal is greater than or equal to a first preset value, the base station improves the expected receiving signal-to-noise ratio of the terminal;
and when the error rate of the terminal is less than or equal to a second preset value, the base station reduces the expected receiving signal-to-noise ratio of the terminal, wherein the second preset value is less than the first preset value.
3. The method of claim 2, wherein the base station improving the expected received signal-to-noise ratio of the terminal comprises:
and if the absolute value of the difference between the expected received signal-to-noise ratio of the terminal and the expected received signal-to-noise ratio of the cell level is smaller than or equal to a fourth preset value after the expected received signal-to-noise ratio of the terminal is increased by a third preset value, the base station increases the expected received signal-to-noise ratio of the terminal by the third preset value.
4. The method of claim 2, wherein the base station reducing the expected received signal-to-noise ratio of the terminal comprises:
and if the absolute value of the difference between the expected received signal-to-noise ratio of the terminal and the expected received signal-to-noise ratio of the cell level is smaller than or equal to a sixth preset value after the expected received signal-to-noise ratio of the terminal is reduced by the fifth preset value, the base station improves the expected received signal-to-noise ratio of the terminal by the fifth preset value.
5. The method of claim 2, wherein before the base station improves the expected received signal-to-noise ratio of the terminal, further comprising:
and the base station determines that the times that the actual receiving signal-to-noise ratio of the terminal is close to the expected receiving signal-to-noise ratio of the terminal is larger than or equal to a sixth preset value, and the times that the actual receiving signal-to-noise ratio of the terminal is close to the expected receiving signal-to-noise ratio of the terminal are the times that the absolute value of the difference value between the actual receiving signal-to-noise ratio of the terminal and the expected receiving signal-to-noise ratio of the terminal is smaller than or equal to a seventh preset.
6. The method of claim 2, wherein before the base station reduces the expected received signal-to-noise ratio of the terminal, further comprising:
and the base station determines that the times that the actual receiving signal-to-noise ratio of the terminal is close to the expected receiving signal-to-noise ratio of the terminal is larger than or equal to an eighth preset value, and the times that the actual receiving signal-to-noise ratio of the terminal is close to the expected receiving signal-to-noise ratio of the terminal are the times that the absolute value of the difference value between the actual receiving signal-to-noise ratio of the terminal and the expected receiving signal-to-noise ratio of the terminal is smaller than or equal to a seventh preset.
7. The method of claim 1, wherein before the base station adjusting the expected received signal-to-noise ratio of the terminal according to the bit error rate of the terminal, further comprising:
and the base station determines that the number of the data blocks transmitted by the terminal in an accumulated mode is larger than or equal to a ninth preset value.
8. A base station, comprising:
the error rate determining module is used for determining the error rate of the terminal;
and the adjusting module is used for adjusting the expected receiving signal-to-noise ratio of the terminal according to the error rate of the terminal.
9. The base station of claim 8,
the adjusting module is specifically configured to increase an expected received signal-to-noise ratio of the terminal when the bit error rate of the terminal is greater than or equal to a first preset value; and when the error rate of the terminal is less than or equal to a second preset value, reducing the expected receiving signal-to-noise ratio of the terminal, wherein the second preset value is less than the first preset value.
10. The base station of claim 9,
the adjustment module is specifically configured to increase the expected received signal-to-noise ratio of the terminal by a third preset value when an absolute value of a difference between the expected received signal-to-noise ratio of the terminal and the expected received signal-to-noise ratio of the cell level is smaller than or equal to a fourth preset value after the expected received signal-to-noise ratio of the terminal is increased by the third preset value.
11. The base station of claim 9,
the adjustment module is specifically configured to increase the expected received signal-to-noise ratio of the terminal by a fifth preset value when an absolute value of a difference between the expected received signal-to-noise ratio of the terminal and the expected received signal-to-noise ratio of the cell level is smaller than or equal to a sixth preset value.
12. The base station of claim 9, further comprising:
a signal-to-noise ratio determining module for determining the number of times that the actual received signal-to-noise ratio of the terminal approaches the expected received signal-to-noise ratio of the terminal;
the adjusting module is specifically configured to increase the expected received signal-to-noise ratio of the terminal when the number of times that the actual received signal-to-noise ratio of the terminal approaches the expected received signal-to-noise ratio of the terminal is greater than or equal to a sixth preset value, where the number of times that the actual received signal-to-noise ratio of the terminal approaches the expected received signal-to-noise ratio of the terminal is the number of times that an absolute value of a difference between the actual received signal-to-noise ratio of the terminal and the expected received signal-to-noise ratio of the terminal is less than or equal to.
13. The base station of claim 9, further comprising:
a signal-to-noise ratio determining module for determining the number of times that the actual received signal-to-noise ratio of the terminal approaches the expected received signal-to-noise ratio of the terminal;
the adjusting module is specifically configured to increase the expected received signal-to-noise ratio of the terminal when the number of times that the actual received signal-to-noise ratio of the terminal approaches the expected received signal-to-noise ratio of the terminal is greater than or equal to an eighth preset value, where the number of times that the actual received signal-to-noise ratio of the terminal approaches the expected received signal-to-noise ratio of the terminal is the number of times that an absolute value of a difference between the actual received signal-to-noise ratio of the terminal and the expected received signal-to-noise ratio of the terminal is less than or equal to.
14. The base station of claim 8, further comprising:
the data block determining module is used for determining the number of the data blocks which are transmitted by the terminal in an accumulated mode;
the adjusting module is specifically configured to adjust an expected received signal-to-noise ratio of the terminal according to the error rate of the terminal when the number of data blocks cumulatively transmitted by the terminal is greater than or equal to a ninth preset value.
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| WO2019080097A1 (en)* | 2017-10-27 | 2019-05-02 | Hewlett Packard Enterprise Development Lp | Adjusting data rates in wireless networks |
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| CN101572940A (en)* | 2009-05-27 | 2009-11-04 | 新邮通信设备有限公司 | Uplink synchronization or uplink power control method, base station and user equipment |
| CN101873685A (en)* | 2009-04-27 | 2010-10-27 | 株式会社Ntt都科摩 | Method and communication terminal used in wireless communication system |
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| CN101388695A (en)* | 2008-11-04 | 2009-03-18 | 北京新邮通通信设备有限公司 | A kind of outer loop power control method |
| CN101873685A (en)* | 2009-04-27 | 2010-10-27 | 株式会社Ntt都科摩 | Method and communication terminal used in wireless communication system |
| CN101572940A (en)* | 2009-05-27 | 2009-11-04 | 新邮通信设备有限公司 | Uplink synchronization or uplink power control method, base station and user equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019080097A1 (en)* | 2017-10-27 | 2019-05-02 | Hewlett Packard Enterprise Development Lp | Adjusting data rates in wireless networks |
| US11082880B2 (en) | 2017-10-27 | 2021-08-03 | Hewlett Packard Enterprise Development Lp | Adjusting data rates in wireless networks |
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| C06 | Publication | ||
| PB01 | Publication | ||
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