CN101141157B - Uplink power control method and network side equipment - Google Patents
Uplink power control method and network side equipment Download PDFInfo
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Abstract
The present invention discloses an uplink power control method and a network side device to enable users to reduce power loss of wireless terminals to acquire the same transmission rate. In the present invention, a network side selects a MCS for a corresponding wireless terminal according to measured uplink SINR and maximum BLER threshold and notifies the wireless terminal to reduce its uplink transmission power while a difference between the SINR and a SINR needed for the maximum BLER threshold of the MCS. While the network side notifies the MCS selected by the wireless terminal, the network side informs the wireless terminal of reducing its uplink transmission power by dispatching an uplink control command. When the wireless terminal receives one uplink power control command, the wireless terminal reduces its uplink transmission power by one step length.
Description
Technical field
The present invention relates to moving communicating field, particularly the uplink power control technology of wireless terminal.
Background technology
3-G (Generation Three mobile communication system) Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division MultipleAccess, be called for short " WCDMA ") system owing to its strong multimedia communication capacity, high-speed data transmission speed and efficiently many advantages such as the availability of frequency spectrum gain great popularity, and become the developing goal of future mobile communications.Yet the development has no limits for technology, and mobile multimedia communication demand that rises and more and more nervous Radio Resource have also proposed more and more higher requirement to the performance of WCDMA system rapidly.
In with the cellular communication system headed by the WCDMA, the received signal quality of wireless terminal is relevant with several factors, as the distance of terminal and base station and neighbor cell base station, path loss index, Rayleigh rapid fading, noise etc.In order to improve power system capacity, peak data rate and cell coverage area, the uplink downlink of system is dealt with the fluctuating of signal quality by link adaptation techniques.Link adaptation techniques commonly used has power control.
Power control can be divided into open Loop Power control and closed power control.Open Loop Power control mainly is to come rough estimate path loss and shadow fading by the known beacon signal that receiving terminal utilizes transmitting terminal to send, and adjusts the transmitting power of receiving terminal with this.The basic ideas of closed power control are signal interference ratio (the Signal to Interference Ratio of the signal that received by the receiving terminal measurement, abbreviation " SIR ") and by judgement provide power control instruction, send transmitting terminal to by feedback channel, carry out by transmitting terminal and adjust transmitted power.
In WCDMA, the wireless terminal in the same sub-district works in same frequency, and the base station only relies on both to distinguish them by spreading code separately.The path loss that is in the wireless terminal of cell edge will exceed much than the path loss of the wireless terminal of close base station location.If do not take the control of certain power, when near the transmitting power of the wireless terminal of base station when excessive, the communication that is easy to block the cell edge wireless terminal produces the problem of " near-far interference ".
To this, mainly adopted fast closed-loop power control to avoid among the WCDMA.In the fast closed-loop power control of up link, the base station is measured the sir value of signal on the up link continually, and it is compared with the target SIR value.If the sir value that records is higher than the target SIR value, the base station just orders wireless terminal to reduce power; If the sir value that records is lower than target SIR value, the base station just orders wireless terminal to improve power.To each wireless terminal, the frequency of this " measurement-indication-reaction " is 1500 times/second, change than any tangible path loss is all fast, and in fact, even the speed of the Rayleigh rapid fading that produces than the wireless terminal with the motion of low speed or middling speed is also fast.Closed power control just can effectively prevent the unbalanced phenomenon of emergent power in the uplink signal of base station reception like this.Adopt same fast closed-loop power control technology in the down link,, when the interference from other sub-districts that is subjected to increases, also can increase signal transmission power in the down link when wireless terminal is in cell edge.
Along with the user is more and more higher to the demand of transmitting high speed data, the procotol of having released R4, R5, R6 three phases is subsequently successively organized in the WCDMA standard formulation, introduced high speed downlink packet access (HighSpeed Downlink Packet Access, be called for short " HSDPA ") technology and high speed uplink packet access (High Speed Uplink Packet Access is called for short " HSUPA ") technology.Different with the fast power control technology in the WCDMARelease99 version, main adaptive modulation and coding (Adaptive Modulation and Coding is called for short " the AMC ") technology of using among HSDPA and the HSUPA.
The basic principle of AMC is dynamically to select only code rate and modulation system according to current channel conditions.When signal to noise ratio is low, can adopt strong coding of error correcting capability and low-order-modulated combination to improve its antijamming capability by self adaptation; When signal to noise ratio is higher, then can adopt redundant less coding and high order modulation to improve data rate.
The link circuit self-adapting function of HSDPA and AMC technology make near the wireless terminal of base station (or have on the short-term meaning good SIR wireless terminal) can obtain the more coded modulation combination of high data rate, and this has just improved user's throughput free of chargely.Otherwise wireless terminal is far away more from the base station, and the data rate of the modulating-coding combination of then being adopted is low more.
Specifically, when adopting AMC, link circuit self-adapting is adjusted Modulation and Coding Scheme (MCS) dynamically according to certain criterion.Usually by data receiver channel quality is measured, as measure Signal to Interference plus Noise Ratio (Signal-to-Noise Ratio where noise includes both thermalnoise and interference of Uplink/Downlink, be called for short " SINR "), and according to the measurement result of resulting channel quality, in conjunction with the hard thresholding of appointment, select suitable MCS.A kind of method commonly used is according to the SINR measurement result, in conjunction with the hard thresholding of Block Error Rate (Block Error Rate is called for short " BLER "), selects suitable MCS.As shown in Figure 1, the corresponding different SINR-BLER performance curve of different MCS schemes, receiving terminal is with reference to these performance curves, according to detected SINR value (channel quality that reflects this terminal), satisfying under the prerequisite that the BLER of system requires, promptly BLER less than under the prerequisite of hard thresholding (as BLER＜10
-2, BLER＜10
-3Deng), select the highest MCS of transmission rate.
In actual applications, there is following problem: waste the transmitting power of wireless terminal, strengthened the burden of wireless terminal.
Cause the main cause of this situation to be, because in the prior art, when alternative MCS scheme is insufficient, in the SINR-BLER performance curve, SINR spacing between some adjacent curve can bigger (more than spacing 1db), thereby satisfying under the situation of specifying the hard thresholding of BLER, the SINR value of the channel reality SINR more required than the MCS of the final selection of AMC exceeds more.Do not consider under the situation of deviation that channel SINR measures and time delay that this moment, actual SINR existed more more than neededly, had caused the waste of the transmitting power of wireless terminal, had strengthened the burden of wireless terminal.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of ascending power control method and network equipment thereof, makes to obtain under the situation of identical traffic speed the user, reduces the power dissipation of wireless terminal.
For achieving the above object, the invention provides a kind of ascending power control method, comprise following steps:
Network side is selected Modulation and Coding Scheme according to the Signal to Interference plus Noise Ratio of the up link that measures and the maximum Block Error Rate thresholding that presets for corresponding wireless terminal;
If the difference of the described Signal to Interference plus Noise Ratio that measures and described selected Modulation and Coding Scheme required Signal to Interference plus Noise Ratio under described maximum Block Error Rate thresholding is greater than preset value, then described network side notifies described wireless terminal to reduce the transmitting power of described up link.
Wherein, described network side notifies this wireless terminal to reduce its up-link transmission power by issuing the up link control command.
In this external described method, described wireless terminal is whenever received once described up-link power control command, and its up-link transmission power is reduced a step-length.
In this external described method, according to the described up link Signal to Interference plus Noise Ratio that records, under the prerequisite that satisfies described maximum Block Error Rate thresholding, described network side is that described wireless terminal is selected the highest Modulation and Coding Scheme of transmission rate.
In this external described method, described network side is controlled the up-link power of described wireless terminal by base station selected described Modulation and Coding Scheme.
The present invention also provides a kind of network equipment, comprises:
Select module, be used for selecting Modulation and Coding Scheme for corresponding wireless terminal according to the Signal to Interference plus Noise Ratio of the up link that measures and the maximum Block Error Rate thresholding that presets;
Notification module is used to notify wireless terminal to reduce the transmitting power of its up link;
Judge module, whether the difference that is used to judge Modulation and Coding Scheme required Signal to Interference plus Noise Ratio under described maximum Block Error Rate thresholding that the described Signal to Interference plus Noise Ratio that measures and described selection module are selected is greater than preset value, if greater than described preset value, then indicate described notification module to notify described wireless terminal to reduce the transmitting power of its up link.
Wherein, described notification module also notifies this wireless terminal described selected Modulation and Coding Scheme in the transmitting power of notifying described wireless terminal to reduce its up link.
In this external described network equipment, described notification module notifies described wireless terminal to reduce the transmitting power of its up link by sending the up-link power control command; The once described up-link power control command of the every transmission of described notification module indicates described wireless terminal that its up-link transmission power is reduced a step-length.
In this external described network equipment, described selection module is according to the described up link Signal to Interference plus Noise Ratio that records, under the prerequisite that satisfies maximum Block Error Rate thresholding, for described wireless terminal is selected the highest Modulation and Coding Scheme of transmission rate.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, network side is selected MCS according to the SINR and the maximum BLER thresholding of the up link that measures for corresponding wireless terminal, and the difference that deducts selected MCS required SINR gained under maximum BLER thresholding at the SINR that measures is during greater than preset value, and the notice wireless terminal reduces the transmitting power of its up link.Make wireless terminal under the fixed situation of its transmission rate, only provide and satisfy the necessary transmitting power of this transmission rate, when avoiding or reducing the power dissipation of wireless terminal, also reduced to other users in the sub-district and to the interference of neighbor cell.
Network side notifies this wireless terminal to reduce its up-link transmission power by issuing the up link control command in its selected MCS of notice wireless terminal.Make this wireless terminal when adjusting MCS, can adjust transmitting power with matching, in time reduce the power consumption of wireless terminal, alleviate the burden of wireless terminal.
Wireless terminal is whenever received the up-link power control command one time, its up-link transmission power is reduced a step-length, high-frequency is adjusted its up-link transmission power by a small margin, effectively avoid influencing each other, improved the compatibility of the present invention and prior art with slow power control of the prior art.
According to the up link SINR that records, under the prerequisite that satisfies maximum BLER thresholding, network side is that wireless terminal is selected the highest MCS of transmission rate, makes wireless terminal under the situation that does not influence its message transmission rate, the unnecessary power dissipation that reduction may exist.
Description of drawings
Fig. 1 is a SINR-BLER reference curve distribution schematic diagram under the awgn channel;
Fig. 2 is the ascending power control method flow chart according to first embodiment of the invention;
Fig. 3 is the structure chart according to the network equipment of second embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Core of the present invention is, network side is selected MCS according to the SINR and the maximum BLER thresholding of the up link that measures for corresponding wireless terminal, and the difference that deducts selected MCS required SINR gained under maximum BLER thresholding at the SINR that measures is during greater than preset value, and notice respective wireless terminal reduces the transmitting power of this up link.Impel wireless terminal under the fixed situation of its transmission rate, only provide and satisfy the necessary transmitting power of this transmission rate, avoid or reduce the power dissipation of wireless terminal and network side, and reduce this wireless terminal to other users in the sub-district and to the interference of neighbor cell.
According to inventive principle, be that the base station is an example below, the first embodiment of the invention ascending power control method is described with the network equipment.
As shown in Figure 2, in step 210, the base station of network side is measured the up link of wireless terminal, according to the SINR of the up link that measures, under the prerequisite that satisfies the maximum BLER thresholding that presets, for the wireless terminal of correspondence is selected the highest MCS of speed.
Then enter step 220, the base station judges that whether its SINR that measures deducts the difference of MCS gained behind SINR required under the maximum BLER thresholding of current selected greater than preset value, if not then entering step 250, otherwise, if greater than preset value, then enter step 230, the base station issues this selected MCS and up link control command to corresponding wireless terminals, notifies this wireless terminal to reduce its up-link transmission power by this up link control command.In the prior art, because some condition restriction, alternative MCS scheme is insufficient sometimes, as shown in Figure 1, in the SINR-BLER performance curve, SINR gap ratio between some adjacent curve is big (more than spacing 1db), thereby satisfying under the situation of specifying the hard thresholding of BLER, the SINR of the wireless terminal up link reality MCS required SINR more selected than the base station exceeds more, under the situation of the deviation of not considering channel SINR measurement and time delay, this moment, there be more having more than needed in actual SINR, and caused the waste of wireless terminal part transmitting power.Therefore in this step, the base station compares MCS required SINR under maximum BLER thresholding of actual SINR of wireless terminal and current selected, during greater than preset value, notifies this wireless terminal to reduce the transmitting power of its up link in both difference.Thereby under the situation of determining the wireless terminal transmission rate, impel it that actual emission power is reduced to and satisfy the necessary transmitting power of corresponding transmission rate, thereby avoid or reduce the power dissipation of wireless terminal, and reduce wireless terminal to other users in the sub-district and to the interference of neighbor cell.
Then enter step 240, after wireless terminal is received this up-link power control command, with step-length of up-link transmission power reduction of this terminal.
Because the base station is short to wireless terminal up link sense cycle, high these characteristics of frequency, be engraved in when making the base station the current transmitting power of wireless terminal is judged, and when transmitting power is higher, in time notify wireless terminal to reduce transmitting power, correspondingly, wireless terminal is whenever received once the up-link power control command from the base station, just its up-link transmission power is reduced a step-length, accomplish that high-frequency adjusts its up-link transmission power by a small margin, effectively avoid influencing each other with slow power control of the prior art, in influence technique effect not, improve the compatibility of the present invention and prior art.
In the difference of MCS required SINR under maximum BLER thresholding of SINR that base station measurement arrives and current selected during not greater than preset value, show that current up-link transmission power of wireless terminal and the MCS that selectes are complementary, do not form waste, enter step 250, the base station only issues this selected MCS, process ends to corresponding wireless terminals.
The second embodiment of the invention network equipment is included as the selection module that wireless terminal is selected MCS as shown in Figure 3; Be used to notify wireless terminal to reduce the notification module of its up-link transmission power; And judge module, be used to judge that whether the SINR that measures deducts the difference of selected MCS gained behind SINR required under the predetermined maximum BLER thresholding greater than preset value.In the present embodiment, this network equipment is the base station.
Specifically, after the base station is measured the up link of wireless terminal, by the SINR that selects module according to the up link that measures, under the prerequisite that satisfies maximum BLER thresholding, for this wireless terminal is selected the highest MCS of transmission rate.Follow by judge module according to selecting the selected MCS of module, judge that whether the SINR that measures deducts the difference of this MCS gained behind SINR required under the maximum BLER thresholding greater than preset value, if greater than preset value, then indicate notification module to notify this wireless terminal to reduce the transmitting power of its up link.Thereby under the situation of determining the wireless terminal transmission rate, impel it that actual emission power is adjusted into and satisfy the necessary transmitting power of this transmission rate, thereby avoid or reduce the power dissipation of wireless terminal, and reduce wireless terminal to other users in the sub-district and to the interference of neighbor cell.This notification module is according to the indication of judge module, when this wireless terminal issues selected MCS, issue the up link control command, notify this wireless terminal to reduce its up-link transmission power by this order, make this wireless terminal when adjusting MCS, can adjust transmitting power with matching.And, the once described up-link power control command of every transmission, indicate described wireless terminal that its up-link transmission power is reduced a step-length, thereby high-frequency is adjusted its up-link transmission power by a small margin, effectively avoid influencing each other with slow power control of the prior art, in influence technique effect not, improve the compatibility of the present invention and prior art.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. an ascending power control method is characterized in that, comprises following steps:
Network side is selected Modulation and Coding Scheme according to the Signal to Interference plus Noise Ratio of the up link that measures and the maximum Block Error Rate thresholding that presets for corresponding wireless terminal;
If the difference of the described Signal to Interference plus Noise Ratio that measures and described selected Modulation and Coding Scheme required Signal to Interference plus Noise Ratio under described maximum Block Error Rate thresholding is greater than preset value, then described network side notifies described wireless terminal to reduce the transmitting power of described up link.
2. ascending power control method according to claim 1 is characterized in that, described network side notifies this wireless terminal to reduce its up-link transmission power by issuing the up link control command.
3. ascending power control method according to claim 2 is characterized in that, described wireless terminal is whenever received once described up-link power control command, and its up-link transmission power is reduced a step-length.
4. ascending power control method according to claim 1, it is characterized in that, according to the described up link Signal to Interference plus Noise Ratio that records, under the prerequisite that satisfies described maximum Block Error Rate thresholding, described network side is that described wireless terminal is selected the highest Modulation and Coding Scheme of transmission rate.
5. according to each described ascending power control method in the claim 1 to 4, it is characterized in that described network side is controlled the up-link power of described wireless terminal by base station selected described Modulation and Coding Scheme.
6. a network equipment is characterized in that, comprises:
Select module, be used for selecting Modulation and Coding Scheme for corresponding wireless terminal according to the Signal to Interference plus Noise Ratio of the up link that measures and the maximum Block Error Rate thresholding that presets;
Notification module is used to notify wireless terminal to reduce the transmitting power of its up link;
Judge module, whether the difference that is used to judge Modulation and Coding Scheme required Signal to Interference plus Noise Ratio under described maximum Block Error Rate thresholding that the described Signal to Interference plus Noise Ratio that measures and described selection module are selected is greater than preset value, if greater than described preset value, then indicate described notification module to notify described wireless terminal to reduce the transmitting power of its up link.
7. network equipment according to claim 6 is characterized in that, described notification module also notifies this wireless terminal described selected Modulation and Coding Scheme in the transmitting power of notifying described wireless terminal to reduce its up link.
8. network equipment according to claim 7 is characterized in that, described notification module notifies described wireless terminal to reduce the transmitting power of its up link by sending the up-link power control command; The once described up-link power control command of the every transmission of described notification module indicates described wireless terminal that its up-link transmission power is reduced a step-length.
9. network equipment according to claim 6, it is characterized in that, described selection module is used for the up link Signal to Interference plus Noise Ratio that records according to described, under the prerequisite that satisfies maximum Block Error Rate thresholding, is that described wireless terminal is selected the highest Modulation and Coding Scheme of transmission rate.
10. according to each described network equipment in the claim 6 to 9, it is characterized in that described network equipment is the base station.
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| CN2006101519995A CN101141157B (en) | 2006-09-08 | 2006-09-08 | Uplink power control method and network side equipment |
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| CA2770699C (en) | 2009-08-12 | 2020-07-21 | Research In Motion Limited | System and method for association and uplink adaptation in a relay network |
| CA2770701C (en) * | 2009-08-12 | 2017-03-14 | Research In Motion Limited | System and method for modulation and coding scheme adaptation and power control in a relay network |
| CN101711058B (en) * | 2009-12-15 | 2012-12-05 | 中兴通讯股份有限公司 | Resource allocation method and resource allocation system |
| CN102271389B (en) * | 2010-06-04 | 2014-03-19 | 中兴通讯股份有限公司 | Uplink power control method and system |
| CN102291809B (en) * | 2010-06-21 | 2016-04-13 | 中兴通讯股份有限公司 | The method that ascending exterior ring power controls and device |
| CN102404836B (en) * | 2010-09-16 | 2015-05-20 | 中兴通讯股份有限公司 | Method and device for acquiring transmission power control (TPC) command |
| CN102088725B (en) | 2011-02-23 | 2015-01-21 | 华为技术有限公司 | Uplink power detection method, device and base station equipment |
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| WO2014131184A1 (en) * | 2013-02-28 | 2014-09-04 | Empire Technology Development Llc | Controlling peak-to-average power ratio (papr) |
| CN104468026B (en) * | 2013-09-24 | 2018-04-27 | 普天信息技术研究院有限公司 | The system of selection of Modulation and Coding Scheme and device |
| CN105024785B (en) * | 2014-04-30 | 2019-02-26 | 普天信息技术有限公司 | Determine the method and system of downlink MCS |
| US10021704B2 (en) * | 2014-10-29 | 2018-07-10 | Telefonaktiebolaget Lm Ericsson (Publ) | System and method for toggling transmission parameters in a heterogeneous network |
| CN106922206B (en) * | 2014-11-21 | 2021-08-31 | 华为技术有限公司 | Method, device and equipment for determining modulation coding order |
| CN104469921B (en) * | 2014-12-04 | 2017-10-10 | 杭州敦崇科技股份有限公司 | Wireless packet-by-packet Poewr control method and device |
| CN104468048B (en) * | 2014-12-15 | 2018-03-27 | 武汉理工大学 | Determine that HARQ I types can use the method for AMC schemes according to merging method is retransmitted |
| CN105873213B (en) * | 2015-01-20 | 2019-11-19 | 电信科学技术研究院 | A kind of method and apparatus carrying out uplink scheduling |
| WO2016154924A1 (en) * | 2015-03-31 | 2016-10-06 | 华为技术有限公司 | Transmitting power adjusting method and device |
| CN109842459B (en) * | 2017-11-25 | 2021-03-30 | 华为技术有限公司 | Data reporting method, receiving method and related device |
| WO2022115998A1 (en) * | 2020-12-01 | 2022-06-09 | 华为技术有限公司 | Power control method and apparatus |
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| CN1790966A (en) * | 2004-12-17 | 2006-06-21 | 中兴通讯股份有限公司 | Self-adaptive code modulating method |
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| CN1790966A (en) * | 2004-12-17 | 2006-06-21 | 中兴通讯股份有限公司 | Self-adaptive code modulating method |
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