CN101938822A - Reverse power control method and reverse power control device - Google Patents
Reverse power control method and reverse power control device Download PDFInfo
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- CN101938822A CN101938822A CN2009101520159A CN200910152015A CN101938822A CN 101938822 A CN101938822 A CN 101938822A CN 2009101520159 A CN2009101520159 A CN 2009101520159A CN 200910152015 A CN200910152015 A CN 200910152015A CN 101938822 A CN101938822 A CN 101938822A
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Abstract
The invention discloses a reverse power control method and a reverse power control device. When a communication system is seriously congested, the emission power of a mobile terminal is adjusted to improve the congesting situation. The method comprises: according to the current wideband resource use ratio, within the preset wideband resource use ratio range and the corresponding relationship of each congesting level, determining the congesting level of the current band width; in the preset power control strategy corresponding to each congesting level, selecting a power control strategy corresponding to the determined congesting level; and according to the selected power control strategy, indicating the mobile terminal to adjust the emission power.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of backward power control method and reverse power control device.
Background technology
For various types of communication systems such as OFDMA, WCDMA, power control fast and accurately is the basic demand that guarantees communication system performance, particularly the control of the power of up link is particularly important, if do not carry out power control, the portable terminal of overpower emission will make the communication conditions of whole sub-district block.Usually power control can be divided into forward power control (promptly controlling the transmitting power of base station) and reverse power control (promptly controlling the transmitting power of portable terminal), wherein reverse power control for guarantee power system capacity and communication quality, to overcome problems such as decline and solution near-far interference even more important.
The reverse power control up-link power control (Uplink Power Control) that is otherwise known as, transmitting power by real-time each portable terminal of adjustment, make in this sub-district arbitrary portable terminal no matter how far from the base station, when signal arrives base station receiver, just reach the required minimum signal-noise ratio threshold of assurance communication quality, thereby guarantee power system capacity.
Existing Uplink Power Control Technology mainly contains reverse open Loop Power control, the control of back closed loop power and the control of backward external ring power.
The signal that reverse open Loop Power control is sent all travelling carriages has identical performance number when arriving the base station.
The control of back closed loop power is to assist portable terminal by the base station, corrects the open loop power prediction that portable terminal is made rapidly, makes portable terminal remain optimal transmitting power.The base station to demodulation after the signal to noise ratio (SNR of reverse traffic channel signal, Signal-to-Noise Ratio) detects once at regular intervals, then itself and the threshold value of setting in advance (or claiming set point) are compared, if the SNR that receives is higher than threshold value, an instruction that reduces mobile terminal emitting power is just sent in the base station on forward channel; Otherwise, just send an instruction that increases mobile terminal emitting power.
The control of backward external ring power is for the attenuation that adapts to wireless channel changes, and dynamically adjusts the signal-noise ratio threshold in the control of back closed loop power.For example, in voice service, that influence service quality is the frame error rate (FER of system, Frame Error Rate), therefore the backward channel FER statistical value of receiving at the base station end will be as the index of adjusting the thresholding signal to noise ratio, make power control directly and communication quality interrelate, improve on the signal to noise ratio and not only be embodied in.
Yet above-mentioned existing backward power control method is the current congestion situation of taking into account system not all, thereby can't heavy congestion occur in system the time, improves the congestion situation of system by reverse power control.
Summary of the invention
The embodiment of the invention provides a kind of backward power control method, in order to when heavy congestion appears in communication system, improves congestion condition by the transmitting power of adjusting portable terminal.
Accordingly, the embodiment of the invention also provides a kind of reverse power control device.
The technical scheme that the embodiment of the invention provides is as follows:
A kind of backward power control method comprises: according to current bandwidth resource utilization and the bandwidth resources utilization rate scope of being scheduled to and the corresponding relation of each congestion level, determine the current congestion grade; And according to the current congestion grade of determining, and the predetermined power control strategy corresponding with each congestion level, select the power control strategy corresponding with the current congestion grade; And according to the power control strategy of selecting, indicating mobile terminal is adjusted transmitting power.
A kind of reverse power control device comprises: determining unit is used for determining the current congestion grade according to current bandwidth resource utilization and the bandwidth resources utilization rate scope of being scheduled to and the corresponding relation of each congestion level; Selected cell is used for the current congestion grade determined according to determining unit, and the predetermined power control strategy corresponding with each congestion level, selects the power control strategy corresponding with the current congestion grade; Indicating member is used for the power control strategy selected according to selected cell, and indicating mobile terminal is adjusted transmitting power.
The embodiment of the invention is determined the current congestion grade of reflection current congestion degree at first according to current bandwidth resource utilization index and the bandwidth resources utilization rate scope of being scheduled to and the corresponding relation of each congestion level; According to the current congestion grade of determining, from the predetermined power control strategy corresponding, select the power control strategy corresponding with the current congestion grade with each congestion level; And according to the power control strategy of selecting, indicating mobile terminal is adjusted transmitting power, provides feasible when system's generation heavy congestion, by the transmitting power of control portable terminal, improves the solution of system congestion situation.
Description of drawings
Fig. 1 is the main realization principle flow chart of the embodiment of the invention;
Fig. 2 is the schematic diagram of the power control strategy of idle grade correspondence in the embodiment of the invention;
Fig. 3 is the schematic diagram of the power control strategy of embodiment of the invention mild or moderate congestion level correspondence;
Fig. 4 is the schematic diagram of the power control strategy of moderate congestion level correspondence in the embodiment of the invention;
Fig. 5 is the schematic diagram of the power control strategy of heavy congestion grade correspondence in the embodiment of the invention;
The structural representation of the reverse power control device that Fig. 6 provides for the embodiment of the invention.
Embodiment
Because existing reverse power control scheme is according to communication quality indexs such as frame error rate, indicating mobile terminal is adjusted transmitting power, the current congestion situation of taking into account system not, thereby can't in system the congestion condition of system appear improving when congested by reverse power control.The embodiment of the invention is selected different power control strategies by the congestion situation current according to system, and comes indicating mobile terminal to adjust transmitting power according to the power control strategy of selecting, and has solved the problems referred to above that prior art exists.
Be explained in detail to the main realization principle of embodiment of the invention technical scheme, embodiment and to the beneficial effect that should be able to reach below in conjunction with each accompanying drawing.
As shown in Figure 1, the main realization principle process of the embodiment of the invention is as follows:
To introduce an embodiment in detail and come the main realization principle of the inventive method is explained in detail and illustrates according to foregoing invention principle of the present invention below.
Usually the base station in the mobile communication system is be unit with time slot (slot), distributes bandwidth resources to portable terminal, so can determine the bandwidth behaviour in service that system is current according to the number of timeslots of distributing to each portable terminal.The bandwidth utilization rate accounts for the percentage of the available time slot sum of system for the number of timeslots of distributing to the portable terminal use.
Default 3 bandwidth utilization rate threshold values in the embodiment of the invention: no congestion threshold PerOfNoCongestion, slight congestion threshold PerOfLightCongestion, moderate congestion threshold PerOfMiddleCongestion; For example PerOfNoCongestion is 10%, PerOfLightCongestion is 30%, PerOfMiddleCongestion is 60%.
Based on above-mentioned bandwidth utilization rate threshold value, 4 congestion level have been set:, be idle grade when system resource utilization rate during smaller or equal to no congestion threshold PerOfNoCongestion; When system resource utilization rate during, be slight congestion level greater than no congestion threshold PerOfNoCongestion and smaller or equal to slight congestion threshold PerOfLightCongestion; When system resource utilization rate during, be the moderate congestion level greater than slight congestion threshold PerOfLightCongestion and smaller or equal to moderate congestion threshold PerOfMiddleCongestion; When system resource utilization rate during, be the heavy congestion grade greater than moderate congestion threshold PerOfMiddleCongestion.
Wherein, the value of above-mentioned 3 bandwidth utilization rate threshold values can dynamically be adjusted, and also can adopt other modes to set the quantity and the corresponding bandwidth utilization rate scope of congestion level in addition.
The congestion level that system is current at first according to bandwidth utilization rate and the above-mentioned predetermined bandwidth resources utilization rate scope and the corresponding relation of each congestion level of current system, is determined in the base station when the backward power of portable terminal is controlled.
Then, from the corresponding respectively power control strategy of each predetermined congestion level, select and the corresponding power control strategy of system's current congestion grade.
In the present embodiment, predetermined corresponding with each congestion level respectively power control strategy is based on the reverse signal to noise ratio of the Frame that portable terminal sends and current modulation coding mode corresponding set point, and is specific as follows:
Please refer to accompanying drawing 2, schematic diagram for the power control strategy of idle grade correspondence, the signal to noise ratio of the reverse data frame that portable terminal is sent is at first determined in the base station, the signal to noise ratio of reverse data frame is that the average power of each sub-carrier signal of pulse in the reverse data frame sent according to portable terminal of the physical layer processing unit in the base station and the ratio between the noise signal average power are determined in the present invention, enter step 201
Please refer to accompanying drawing 3, be the schematic diagram of the power control strategy of slight congestion level correspondence:
Please refer to accompanying drawing 4, be the schematic diagram of the power control strategy of moderate congestion level correspondence:
Step 404, indicating mobile terminal reduces transmitting power, for example by sending PowerControlIE, Fast PowerControl Message constant power control messages to portable terminal, informs that portable terminal reduces transmitting power;
Please refer to accompanying drawing 5, be the schematic diagram of the power control strategy of heavy congestion grade correspondence:
At last, according to the power control strategy of selecting current congestion grade correspondence, indicating mobile terminal is adjusted transmitting power.
Above-mentioned power control strategy is based on the set point of the reverse signal to noise ratio of the Frame that portable terminal sends and current modulation coding mode correspondence in the embodiment of the invention, in the time of can also selecting other to help heavy congestion to occur equally, can help the mobile terminal power of mitigation system congestion condition to adjust strategy in system.
The reverse power control scheme that the embodiment of the invention proposes is applicable to polytype wireless communication system, CDMA or for example based on OFDM (OFDMA, Orthogonal Frequency Division Multiple Access) and in the worldwide interoperability for microwave access of MIMO (Multiple-Input Multiple-Output) technology (WiMAX, the Worldwide Interoperability for Microwave Access) system.
The embodiment of the invention at first according to current bandwidth resource utilization index and predetermined bandwidth resources utilization rate scope and each corresponding relation that reflects the congestion level of different congestion severities, is determined the current congestion grade; And according to the current congestion grade of determining, from the power control strategy of each predetermined congestion level correspondence, select the power control strategy of current congestion grade correspondence, in the present embodiment, at different Congestion Level SPCCs, select different power control strategies, for example, when the current congestion grade is comparatively serious, selection can improve the power control strategy of the congestion condition of system by the transmitting power of adjusting portable terminal, for example tends to reduce the power control strategy of mobile terminal emitting power; And according to the power control strategy of selecting, indicating mobile terminal is adjusted transmitting power, and the feasible reverse power control of passing through is provided, and improves the solution of system congestion situation.
Correspondingly, the embodiment of the invention also provides a kind of reverse power control device, and as shown in Figure 6, this device comprises determining unit 601, selected cell 602 and indicating member 603, and is specific as follows:
Determining unit 601 according to the current bandwidth resource utilization, in the corresponding relation of predetermined bandwidth resources utilization rate scope and each congestion level, is determined the congestion level of current bandwidth;
Indicating member 603 is used for the power control strategy selected according to selected cell 602, and indicating mobile terminal is adjusted transmitting power.
Preferably, above-mentioned reverse power control device can be arranged in the base station.
Preferably, above-mentioned reverse power control device can be arranged in the WiMAX base station.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1. a backward power control method is characterized in that, comprising:
According to the current bandwidth resource utilization, in the corresponding relation of predetermined bandwidth resources utilization rate scope and each congestion level, determine the congestion level of current bandwidth;
In the predetermined power control strategy corresponding, select and the corresponding power control strategy of determining of congestion level with each congestion level; And
According to the power control strategy of selecting, indicating mobile terminal is adjusted transmitting power.
2. the method for claim 1 is characterized in that, described congestion level comprises idle grade at least, and the power control strategy corresponding with described idle grade is:
When the signal to noise ratio of the reverse data frame that sends at portable terminal was not less than the set point of current modulation coding mode correspondence, the portable terminal that indication sends described reverse data frame reduced transmitting power.
3. the method for claim 1 is characterized in that, described congestion level comprises idle grade at least, and the power control strategy corresponding with described idle grade is:
When the signal to noise ratio of the reverse data frame that sends at portable terminal was lowest-order less than the set point of current modulation coding mode correspondence and current modulation coding mode, the portable terminal that indication sends described reverse data frame improved transmitting power.
4. the method for claim 1 is characterized in that, described congestion level comprises slight congestion level at least, and the power control strategy corresponding with described slight congestion level is:
The signal to noise ratio of the reverse data frame that sends at portable terminal is during less than the set point of current modulation coding mode correspondence, and the portable terminal that indication sends described reverse data frame improves transmitting power.
5. the method for claim 1 is characterized in that, described congestion level comprises slight congestion level at least, and the power control strategy corresponding with described slight congestion level is:
When the signal to noise ratio of the reverse data frame that sends at portable terminal was not less than the set point of current modulation coding mode correspondence and current modulation coding mode for high-order, indication sent the portable terminal reduction transmitting power of described reverse data frame.
6. the method for claim 1 is characterized in that, described congestion level comprises the moderate congestion level at least, and the power control strategy corresponding with described moderate congestion level is:
The signal to noise ratio of the reverse data frame that sends at portable terminal is during less than the set point of current modulation coding mode correspondence, and the portable terminal that indication sends described reverse data frame improves transmitting power.
7. the method for claim 1 is characterized in that, described congestion level comprises the moderate congestion level at least, and the power control strategy corresponding with described moderate congestion level is:
During for high-order, indication sends the portable terminal reduction transmitting power of described reverse data frame to the signal to noise ratio of the reverse data frame that sends at portable terminal less than the set point of current modulation coding mode correspondence and current modulation coding mode.
8. the method for claim 1 is characterized in that, described congestion level comprises the moderate congestion level at least, and the power control strategy corresponding with described moderate congestion level is:
The signal to noise ratio of the reverse data frame that sends at portable terminal is not less than the set point of current modulation coding mode correspondence and when being not high-order than the set point of the modulation coding mode correspondence of current modulation coding mode higher order and current modulation coding mode, the portable terminal that indication sends described reverse data frame improves transmitting power.
9. the method for claim 1 is characterized in that, described congestion level comprises the heavy congestion grade at least, and the power control strategy corresponding with described heavy congestion grade is:
At current modulation coding mode is the signal to noise ratio of the reverse data frame that sends of high-order and portable terminal during less than the set point of current modulation coding mode correspondence, and the portable terminal that indication sends described reverse data frame improves transmitting power.
10. the method for claim 1 is characterized in that, described congestion level comprises the heavy congestion grade at least, and the power control strategy corresponding with described heavy congestion grade is:
When the signal to noise ratio of the reverse data frame correspondence that sends for high-order and portable terminal at current modulation coding mode was not less than the set point of current modulation coding mode correspondence, the portable terminal that indication sends described reverse data frame reduced transmitting power.
11. the method for claim 1 is characterized in that, described congestion level comprises the heavy congestion grade at least, and the power control strategy corresponding with described heavy congestion grade is:
At current modulation coding mode is not the signal to noise ratio of the reverse data frame correspondence that sends of high-order and portable terminal during less than the set point of high order modulation coded system correspondence, and the portable terminal that indication sends described reverse data frame improves transmitting power.
12. a reverse power control device is characterized in that, comprising:
Determining unit is used for according to the current bandwidth resource utilization, in the corresponding relation of predetermined bandwidth resources utilization rate scope and each congestion level, determines the congestion level of current bandwidth;
Selected cell is used for selecting the corresponding power control strategy of determining with determining unit of congestion level at the predetermined power control strategy corresponding with each congestion level;
Indicating member is used for the power control strategy selected according to selected cell, and indicating mobile terminal is adjusted transmitting power.
13. device as claimed in claim 12 is characterized in that, described device is arranged in the base station.
14. device as claimed in claim 13 is characterized in that, described base station is the worldwide interoperability for microwave access base station.
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| CN 200910152015 CN101938822B (en) | 2009-07-02 | 2009-07-02 | Reverse power control method and reverse power control device |
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| CN 200910152015 CN101938822B (en) | 2009-07-02 | 2009-07-02 | Reverse power control method and reverse power control device |
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| WO2012113261A1 (en) * | 2011-02-23 | 2012-08-30 | 中兴通讯股份有限公司 | Method and system for the base station power saving |
| WO2012149737A1 (en) * | 2011-05-05 | 2012-11-08 | 中兴通讯股份有限公司 | Mobile terminal and method thereof for implementing power consumption control |
| CN102791020A (en) * | 2011-05-20 | 2012-11-21 | 纬创资通股份有限公司 | Mobile device, method of adjusting radio transmission power, and computer program product |
| CN110708257A (en) * | 2014-09-02 | 2020-01-17 | 华为技术有限公司 | Method and equipment for transmitting data |
| CN111989955A (en) * | 2018-04-26 | 2020-11-24 | 华为技术有限公司 | Power adjustment method and related equipment |
| CN113473529A (en) * | 2021-07-05 | 2021-10-01 | 中国联合网络通信集团有限公司 | Congestion control method and vehicle-mounted terminal |
| CN114500357A (en) * | 2020-10-27 | 2022-05-13 | 北京华为数字技术有限公司 | Path determination method and device |
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| CN114500357B (en) * | 2020-10-27 | 2024-02-09 | 北京华为数字技术有限公司 | Path determination method and device |
| CN113473529A (en) * | 2021-07-05 | 2021-10-01 | 中国联合网络通信集团有限公司 | Congestion control method and vehicle-mounted terminal |
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