WO2011009359A1 - Procédé, système et dispositif de commande de puissance inverse pour résister à une saturation de puissance - Google Patents

Procédé, système et dispositif de commande de puissance inverse pour résister à une saturation de puissance Download PDF

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Publication number
WO2011009359A1
WO2011009359A1 PCT/CN2010/074278 CN2010074278W WO2011009359A1 WO 2011009359 A1 WO2011009359 A1 WO 2011009359A1 CN 2010074278 W CN2010074278 W CN 2010074278W WO 2011009359 A1 WO2011009359 A1 WO 2011009359A1
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WIPO (PCT)
Prior art keywords
reverse
terminal
cinr
base station
rssi
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PCT/CN2010/074278
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English (en)
Chinese (zh)
Inventor
唐枫
鲁绍贵
侯新宇
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中兴通讯股份有限公司
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Publication of WO2011009359A1 publication Critical patent/WO2011009359A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a directional power control method, system and apparatus for resisting power saturation. Background technique
  • the base station needs to provide services for the terminal, and the base station communicates with the terminal through the uplink and downlink links, specifically: the base station sends data to the terminal through the downlink, and the terminal sends data to the base station through the uplink, and is specific.
  • the base station can communicate with multiple terminals at the same time.
  • Orthogonal Frequency Division Multiple Access (OFDMA) technology can effectively resist multipath interference and narrowband interference, and the spectrum efficiency is relatively high, thus becoming the physical medium in wireless communication.
  • Mainstream technology in layer technology.
  • MIMO Multiple Input-Multiple Output
  • the technical advantage is more suitable for broadband mobile communication systems.
  • WiMAX Worldwide Interoperability for Microwave Access (WiMAX) system uses OFDMA technology as its physical layer core technology and is compatible with the WiMAX802.16e protocol, so it has strong competitiveness.
  • FIG. 1 For a WiMAX system using OFDMA technology, there is a curve as shown in FIG. 1 when it is running. According to the curve, a Received Signal Strength Indicator (RSSI) in a WiMAX system can be seen. When the value exceeds a certain limit value, it is XI in Fig. 1. When the value of the RSSI increases again, that is, when the transmission power is further increased, the reverse carrier interference noise ratio (CINR, Carrier to Interference plus Noise Ratios) Instead The decrease, that is, the direction power is reduced. Since the RSSI and the CINR are not linear, simply increasing the RSSI not only increases the CINR, but also causes the control of the direction power to fail, thereby forming a vicious circle, which seriously affects the performance of the system. Summary of the invention
  • the embodiments of the present invention provide a reverse power control method, system, and device for resisting power saturation, which are used to solve the problem of control failure of direction power caused by directional power saturation in the prior art, thereby affecting system performance. .
  • an embodiment of the present invention provides a reverse power control method for resisting power saturation, including:
  • the base station receives the terminal data sent by the terminal, and obtains a reverse received signal strength indicator RSSI of the terminal data;
  • the base station compares the RSSI with the set reverse maximum received signal strength indication, and controls the transmit power of the terminal according to the result of the comparison.
  • an embodiment of the present invention provides a reverse power control system that resists power saturation, including:
  • a base station configured to receive data sent by the terminal, obtain a reverse received signal strength indication RSSI of the terminal data, compare the RSSI with the set reverse maximum received signal strength indication, and transmit power to the terminal according to the comparison result.
  • an embodiment of the present invention further provides a base station, including:
  • a receiving and acquiring module configured to receive data sent by the terminal, and obtain a reverse received signal strength indicator RSSI of the terminal data
  • a control module configured to compare the RSSI with the set reverse maximum received signal strength indication, and control the transmit power of the terminal according to the comparison result.
  • the reverse power of the power saturation is provided by the embodiment of the present invention.
  • the control method, system and device compare the acquired reverse RSSI of the terminal data with the set reverse RSSImax, and control the transmission power of the terminal according to the comparison result.
  • the reverse power saturation is effectively controlled to improve the performance of the system.
  • the embodiment of the present invention adopts a method of reducing the power of the terminal or directly reducing the order of the UIUC, thereby avoiding the disadvantage of reducing the error rate caused by the indirect reduction of the power of the terminal;
  • the use of a low-order modulation method can reduce the packet error rate, thereby effectively controlling the reverse saturation of the power, thereby improving the performance of the system.
  • the present invention can solve the problem of control failure of directional power due to directional power saturation in the prior art, thereby affecting system performance.
  • Figure 1 is a schematic diagram showing the relationship between RSSI and CINR in a WiMAX system
  • FIG. 2 is a schematic flowchart of a reverse power control process according to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of performing reverse power control according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of an outer loop power saturation control process according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a reverse power control process combining outer loop control and inner loop control according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a system for reverse power control according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention. detailed description
  • the embodiment of the present invention provides a reverse power control method for resisting power saturation.
  • the method includes: receiving, by the base station, data sent by the terminal, and acquiring the reverse of the terminal data.
  • the received signal strength indicates RSSI
  • the base station compares the RSSI with the set reverse maximum received signal strength indication, and controls the transmit power of the terminal according to the comparison result.
  • Reverse the RSSI of the acquired terminal data and the reverse of the settings RSSImax compares, when the RSSI is saturated, the control reduces the power of the terminal or reduces the order of the UIUC, so that the reverse saturation of the power can be effectively controlled, thereby improving the performance of the system.
  • FIG. 2 shows the reverse power control.
  • the process mainly includes the following steps:
  • Step 201 The base station receives the data sent by the terminal, and obtains a reverse received signal strength indicator RSSI of the terminal data.
  • terminal data refers to data sent by the terminal.
  • Step 202 The base station compares the reverse RSSI with the set reverse maximum received signal strength indication, and controls the transmit power of the terminal according to the comparison result.
  • the base station before the base station acquires the reverse received signal strength indication RSSI of the terminal data, the base station also needs to acquire the reverse carrier interference signal to noise ratio CINR of the terminal data, and corresponding to the current adjusted coding mode of the saved terminal.
  • the CINR target value is compared with the CINR target value, and the subsequent steps are performed based on the comparison result.
  • each terminal corresponds to a modulation and coding mode, which is specifically represented by a correspondence between a terminal identifier and a modulation and coding mode, and a corresponding CINR target value is saved for each modulation and coding mode.
  • the base station determines that the current frame data of the terminal is to be subjected to reverse power control, the terminal identifier of the terminal is obtained, and the current modulation and coding mode corresponding to the terminal identifier is determined, and the current modulation and coding mode and the modulation code are used according to the current modulation and coding mode.
  • the correspondence between the mode and the CINR target value determines the CINR target value saved for the current modulation and coding mode.
  • the CINR and CINR target values are compared before the transmission power of the terminal is controlled, and the direction RSSI is compared with the reverse maximum received signal strength indication.
  • the order of the steps can be interchanged.
  • the reverse CINR is greater than the CINR target value, and the RSSI is not less than the set reverse maximum received signal strength indication, it is determined whether the current uplink interval usage code (UIUC, Uplink Interval Usage Code) is at the lowest level. And determining, according to the result of the judgment, a method for controlling the transmit power of the terminal, that is, when the UIUC is at the lowest level, the base station sends a command to the terminal to control the terminal to reduce the transmit power, otherwise, the base station decreases the UIUC.
  • UIUC Uplink Interval Usage Code
  • the base station sends a command to the terminal, and the control terminal decreases the transmit power.
  • the base station When the reverse CINR is not greater than the CINR target value, and when the RSSI is not less than the set reverse maximum received signal strength indication, the base station sends a command to the terminal to control the terminal to reduce the transmit power.
  • the base station When the reverse CINR is not greater than the CINR target value, and when the RSSI is less than the set reverse maximum received signal strength indication, the base station sends a command to the terminal to control the terminal to increase the transmit power.
  • the process of the base station acquiring the reverse CINR of the terminal data includes: the base station detecting the burst signal and the noise ratio according to the burst of the current frame data of the terminal, and obtaining the current frame data of the terminal.
  • the reverse carrier interference signal to noise ratio includes: the base station detecting the burst signal and the noise ratio according to the burst of the current frame data of the terminal, and obtaining the current frame data of the terminal.
  • FIG. 3 shows a reverse power control process.
  • the process of reverse power control is described below in conjunction with a specific embodiment.
  • the process mainly includes the following steps:
  • Step 301 When the base station receives the terminal data, determine whether the first power control period comes according to the set first power control period, and if yes, proceed to step 302; otherwise, wait for the next frame data of the terminal to arrive, and perform Step 301.
  • the first power control period refers to: a period in which power control processing is performed on current frame data of the terminal in the inner loop power saturation control process.
  • the first power control cycle can In terms of time, it can also be in units of frames. In the specific decision, it can be flexibly selected and modified as needed. That is, the determining whether the first power control period is coming, that is, determining whether to perform power control processing on the current frame data of the terminal.
  • Step 302 The base station acquires a reverse carrier interference signal-to-noise ratio CINR of the current frame data of the terminal, and determines whether the reverse carrier interference signal-to-noise ratio CINR is greater than a CINR target value saved for the current modulation and coding mode of the terminal, and if yes, Go to step 303; otherwise, proceed to step 304;
  • the CINR target value is a CINR value of a current modulation and coding mode for the terminal that is saved during the power control process.
  • Step 303 Obtain a reverse received signal strength indication RSSI of the current frame data of the terminal, determine whether the reverse received signal strength indicator RSSI is not less than a set maximum reverse received signal strength indicator RSSImax, and if yes, proceed to step 305; otherwise, proceed to step 305; , proceeding to step 306;
  • Step 304 Obtain a reverse received signal strength indication RSSI of the current frame data of the terminal, determine whether the reverse received signal strength indicator RSSI is not less than a set maximum reverse received signal strength indicator RSSImax, and if yes, proceed to step 306; otherwise, proceed to step 306; , proceeding to step 307;
  • Step 305 Determine whether the current UIUC is at the lowest level, and if it is the lowest order, perform steps
  • the UIUD is similar to the MCS (Modulation and Coding Scheme), except that the UIUC is a number that represents a certain MCS.
  • the correspondence table of the specific UIUC and MCS FECCode is sent to the terminal through the UCD.
  • Step 306 According to the protocol, the base station sends a command to the terminal to reduce the transmit power of the terminal.
  • the protocol is a WiMAX 802.16e protocol.
  • the commands sent by the base station to the terminal include: a Fast Power Control Message, a Power Control IE, and a Ranging command.
  • the purpose of reducing the power is to reduce the order of UIUC indirectly.
  • Step 307 the base station sends a command to the terminal to increase the transmit power of the terminal.
  • the commands sent by the base station to the terminal include: a Fast Power Control Message, a Power Control IE, and a Ranging command.
  • Step 308 The base station reduces the order of the UIUC, and adopts a low-order modulation mode.
  • the disadvantage of directly reducing the order of the UIUC can avoid the disadvantage of reducing the error rate caused by the indirect reduction of the power of the terminal, and adopting a low-order modulation method can reduce the packet error rate.
  • the value of the set RSSImax may be equal to the value of the XI, or XI is relatively close to the value, and the value of the RS SImax can be specifically set according to the relationship between different RSSI and CINR.
  • the reverse received signal strength of the data of the current frame of the terminal is not less than RSSImax, it indicates that the reverse power has reached a saturated state, and the continued increase of power may cause the reverse performance of the system to deteriorate. Therefore, the reverse signal reception strength needs to be limited to RSSImax to ensure that the reverse performance of the system is not affected.
  • FIG. 4 shows a process of the outer loop power saturation control, the process mainly comprising the following steps:
  • Step 401 The base station performs a cyclic redundancy check (CRC, Cyclic Redundancy Check) on the received terminal data, and a sequence header check sequence (HCS, Header Check Sequence) check, and cumulatively detects the number of frames according to the check result. And the number of errors.
  • CRC Cyclic Redundancy Check
  • HCS Header Check Sequence
  • the process of accumulating the number of frames and the number of error packets according to the result of the check mainly includes: the base station checks each frame of data sent by the received terminal, and performs verification on the PDU in the data burst, and the check mainly includes CRC checksum and HCS check, the base station checks CRC and HCS according to a certain period The result is a count of the packet error rate during the period.
  • the base station checks each frame of data sent by the received terminal, and performs verification on the PDU in the data burst, and the check mainly includes CRC checksum and HCS check, the base station checks CRC and HCS according to a certain period The result is a count of the packet error rate during the period.
  • the period may be the number of frames, for example, 10 frames, in which a total of 20 terminals of the terminal are received.
  • Step 402 The base station determines, according to the set second power control period, whether the second power control period comes when receiving the data sent by the terminal, and if yes, performing step 403; otherwise, waiting for the next frame data of the terminal to arrive. And step 402 is performed.
  • the second power control period refers to: a period in which power control processing is performed on current frame data of the terminal in an outer loop power saturation control process.
  • the second power control period may be in units of time or in units of frames, and the specific determination is to flexibly select according to needs.
  • Step 403 The base station calculates a reverse packet error rate PER according to the obtained number of frames and the number of error packets.
  • Step 404 The base station compares the calculated reverse PER with the set PER threshold values, and determines a reverse CINR target value according to the result of the threshold comparison and the calculated reverse CINR of the frame data sent by the terminal. .
  • the process of determining a reverse CINR target value for the current modulation and coding mode of the terminal according to the comparison result includes:
  • the target value of the reverse CINR is a difference between the reverse CINR of the frame data and the set first adjustment amount
  • the target value of the reverse CINR is the reverse CINR of the frame data and the set The difference between the two adjustments;
  • the target value of the reverse CINR is the sum of the reverse CINR of the frame data and the set third adjustment amount.
  • the PER first threshold value of the setting is greater than the set PER second threshold value, and the PER second threshold value is greater than the set PER third threshold value; where, the first, second, third Adjustment amount Mainly used for adjusting the first, second, and third threshold values, wherein the first and second adjustment amounts are performed in the same direction for the first and second threshold values, and the first adjustment amount is greater than the set Two adjustments.
  • the target value of the CINR is adjusted once every time the second power control period comes, and when the reverse PER is greater than the set PER first threshold, the inverse of the frame data is Adjusting the magnitude of a first adjustment amount downward to the CINR; when the reverse PER is between the set PER first threshold value and the PER second threshold value, adjusting the reverse CINR of the frame data downward one The size of the second adjustment amount; when the reverse PER is smaller than the set PER third threshold, the reverse CINR of the frame data is adjusted upward by a third adjustment amount.
  • the process of performing outer loop power control in the above embodiment mainly establishes a correspondence relationship between the transmission quality of the radio link and the target value of the inner loop power control CINR.
  • the CINR target value is determined by the outer loop power control, and the inner loop power control CINR target value is adjusted to a level that ensures good signal quality. Therefore, the quality of the received signal can be guaranteed, and the capacity of the system can be maximized.
  • the outer loop power control provides a dynamic and accurate CINR target value for the inner loop power control, and the outer loop power control can adjust the CINR target value according to the error packet rate based on the inner loop power control, so that the error packet rate is maintained at Within the allowable range.
  • FIG. 5 is a process of the reverse power control, and the process includes the following steps: Step 501: The base station receives the terminal The data is subjected to CRC check, and HCS check, and the number of frames detected and the number of error packets are accumulated according to the result of the check;
  • Step 502 The base station determines, according to the set second power control period, whether the second power control period comes when receiving the data sent by the terminal, and if yes, proceeding to step 503; otherwise, waiting for the arrival of the next frame data of the terminal, And proceeding to step 502;
  • Step 503 The base station calculates a reverse packet error rate PER according to the obtained number of frames and the number of error packets, and determines a reverse CINR target value of the terminal.
  • the determining, by the terminal, the reverse CINR target value of the current modulation and coding mode of the terminal includes: i. when the calculated reverse PER is greater than the set PER first threshold, the target value of the reverse CINR is the frame data. a difference between the reverse CINR and the set first adjustment amount;
  • the target value of the reverse CINR is the reverse CINR of the frame data and the set The difference between the two adjustments;
  • the target value of the reverse CINR is a sum of a reverse CINR of the frame data and a set third adjustment amount; wherein, the setting The PER first threshold is greater than the set PER second threshold, the set PER second threshold is greater than the set PER third threshold, and the set first adjustment is greater than the set second adjustment.
  • Step 504 When the base station receives the terminal data sent by the terminal, determining, according to the set first power control period, whether the first power control period is coming, that is, determining whether to perform power control processing on the current frame data of the terminal, if Go to step 505; otherwise, wait for the arrival of the next frame data of the terminal, proceed to step 504;
  • Step 505 The base station acquires a reverse carrier interference signal-to-noise ratio CINR of the current frame data of the terminal, and determines whether the reverse carrier interference signal-to-noise ratio CINR is greater than a saved CINR target value for the current modulation and coding mode of the terminal, and if yes, Go to step 506; otherwise, proceed to step 507;
  • Step 506 Obtain a reverse received signal strength indication RSSI of the current frame data of the terminal, determine whether the reverse received signal strength indicator RSSI is not less than a set maximum reverse received signal strength indicator RSSImax, and if yes, proceed to step 508; otherwise, proceed to step 508; Going to step 509;
  • Step 507 Obtain a reverse received signal strength indication RSSI of the current frame data of the terminal, determine whether the reverse received signal strength indicator RSSI is not less than a set maximum reverse received signal strength indicator RSSImax, and if yes, proceed to step 509; otherwise, proceed to step 509; Going to step 510;
  • Step 508 Determine whether the current UIUC is at the lowest level, if it is the lowest order, proceed to step 509, otherwise, proceed to step 511;
  • Step 509 According to the protocol, the base station sends a command to the terminal to reduce the transmission power of the terminal.
  • the protocol refers to the WiMAX 802.16e protocol;
  • Step 510 According to the protocol, the base station sends a command to the terminal to increase the transmit power of the terminal.
  • Step 511 The base station lowers the UIUC and adopts a low-order modulation mode.
  • FIG. 6 is a schematic structural diagram of a reverse power control system against power saturation according to an embodiment of the present invention, where the system includes:
  • a base station configured to receive data sent by the terminal, obtain a reverse received signal strength indication RSSI of the terminal data, compare the RSSI with the set reverse maximum received signal strength indication, and transmit power to the terminal according to the comparison result.
  • FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention, where the base station includes: a receiving and acquiring module 71, configured to receive data sent by the terminal, and obtain a reverse received signal strength indicator RSSI of the terminal data;
  • the control module 72 is configured to compare the RSSI with the set reverse maximum received signal strength indication, and control the transmit power of the terminal according to the comparison result.
  • the base station further includes:
  • the comparing module 73 is configured to obtain a reverse carrier interference signal to noise ratio (CINR) of the terminal data, and compare the CINR with a CINR target value corresponding to the saved current modulation and coding mode of the terminal.
  • CINR reverse carrier interference signal to noise ratio
  • the control module 72 includes:
  • the first control unit 721 is configured to determine whether the CINR is greater than a CINR target value, and the RSSI is not less than a set reverse maximum received signal strength indication, and determine whether the current uplink interval usage code UIUC is at a lowest level, according to the result of the determination. Controlling the transmit power of the terminal;
  • the second control unit 722 is configured to determine that the CINR is greater than a CINR target value, and when the RSSI is less than the set reverse maximum received signal strength indication, send a command to the terminal to control the terminal to reduce the transmit power.
  • the first control unit 721 includes:
  • the first control sub-unit 7211 is configured to send a command to the terminal to control the terminal to reduce the transmit power when the UIUC is at the lowest level;
  • the second control sub-unit 7212 is configured to reduce the order of the UIUC when the UIUC is not at the lowest order, and adopt a low-order modulation mode.
  • the control module 72 includes:
  • the third control unit 723 is configured to: when the CINR is not greater than the CINR target value, and the RSSI is not less than the set reverse maximum received signal strength indication, send a command to the terminal, and control the terminal to reduce the transmit power. ;
  • the fourth control unit 724 is configured to: when the CINR is not greater than the CINR target value, and the RSSI is less than the set reverse maximum received signal strength indication, send a command to the terminal to control the terminal to increase the transmit power.
  • the comparison module 73 includes:
  • the calculating unit 731 is configured to perform verification on the data sent by the terminal, and calculate a reverse packet error rate PER according to the result of the verification;
  • the comparison determining unit 732 is configured to compare the thresholds of the PER of the reverse PER preset value, and determine the reverse CINR target value according to the comparison result and the calculated reverse CINR of the terminal data.
  • the comparison determining unit 732 includes:
  • a first determining subunit 7321 configured to: when the reverse PER is greater than a set PER first threshold, the target value of the reverse CINR is a difference between a reverse CINR of the terminal data and a set first adjustment amount;
  • a second determining sub-unit 7322 configured to: when the reverse PER is less than the set PER first threshold, and greater than the set PER second threshold, the target value of the reverse CINR is the reverse of the terminal data The difference between the CINR and the set second adjustment amount;
  • a third determining subunit 7323 configured to when the reverse PER is less than a set PER third threshold
  • the target value of the reverse CINR is the sum of the reverse CINR of the terminal data and the set third adjustment amount.
  • Embodiments of the present invention provide a reverse power control method, system, and apparatus for resisting power saturation.
  • the method includes: receiving, by a base station, data sent by a terminal, acquiring a reverse RSSI of the terminal data, and inverting the RSSI and the setting.
  • the RSSImax is compared, and the transmission power of the terminal is controlled according to the comparison result.
  • the inverse RSSI of the obtained terminal data is compared with the set reverse RSSImax.
  • the control reduces the power of the terminal or reduces the order of the UIUC, so that the reverse saturation of the power can be effectively controlled, thereby improving the system. Performance.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention porte sur un procédé, un système et un dispositif de commande de puissance inverse qui permettent de résister à une saturation de puissance, résolvant ainsi le problème de l'état de la technique qui se trouve dans l’impossibilité de commander la puissance inverse suite à une saturation de puissance inverse, ce qui influence, par conséquent, le fonctionnement du système. Dans le procédé, une station de base reçoit les données transmises par un terminal, acquiert l'indicateur d'intensité inverse de signal reçu (RSSI) des données de terminal, compare ledit RSSI avec un indicateur d'intensité de signal inverse, reçu, maximal, prédéterminé (RSSImax), et commande la puissance de transmission du terminal selon le résultat de la comparaison. En comparant le RSSI acquis des données de terminal avec le RSSImax préréglé et en diminuant la puissance du terminal ou du niveau du code d'utilisation d'intervalle de liaison montante (UIUC) lorsque ledit RSSI est saturé, la saturation de puissance inverse peut être efficacement commandée et le fonctionnement du système peut ainsi être amélioré.
PCT/CN2010/074278 2009-07-22 2010-06-22 Procédé, système et dispositif de commande de puissance inverse pour résister à une saturation de puissance WO2011009359A1 (fr)

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CN2009101591830A CN101965044B (zh) 2009-07-22 2009-07-22 一种抵抗功率饱和的反向功率控制方法、系统及装置

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