WO2012145974A1 - Procédé et dispositif permettant de déclencher un rapport de marge de puissance - Google Patents

Procédé et dispositif permettant de déclencher un rapport de marge de puissance Download PDF

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Publication number
WO2012145974A1
WO2012145974A1 PCT/CN2011/077886 CN2011077886W WO2012145974A1 WO 2012145974 A1 WO2012145974 A1 WO 2012145974A1 CN 2011077886 W CN2011077886 W CN 2011077886W WO 2012145974 A1 WO2012145974 A1 WO 2012145974A1
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WO
WIPO (PCT)
Prior art keywords
user equipment
power
power headroom
power management
timer
Prior art date
Application number
PCT/CN2011/077886
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English (en)
Chinese (zh)
Inventor
刘扬
黄亚达
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of WO2012145974A1 publication Critical patent/WO2012145974A1/fr

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Classifications

    • 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
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/365—Power headroom reporting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information

Definitions

  • the present invention relates to the field of communications, and in particular to a method and apparatus for triggering a power headroom report.
  • wireless communication systems use electromagnetic waves to communicate with fixed or mobile wireless communication user equipment (e.g., wireless telephones or devices such as notebooks, computers with wireless communication cards, etc., may be referred to as user equipment).
  • a User Equipment UE
  • the wireless communication channel divides the electromagnetic wave frequency into a plurality of carrier frequencies, and one carrier frequency or a plurality of carrier frequencies may constitute a wireless service area.
  • the user equipment can communicate with other devices in the system (such as control network elements or other user equipments) through one or more carriers.
  • the control network element of the wireless communication system can control other devices according to the communication protocol/technology agreed upon by the system.
  • the control network element includes a control station and a network.
  • the control station includes, but is not limited to, a base station (BS), a relay station (RS), and a user equipment.
  • BS base station
  • RS relay station
  • the user equipment may be selected in the user equipment according to a predetermined rule. As a temporary control station.
  • Communication protocols/technologies include, but are not limited to, GSM (Global System for Mobile Communications), CDMA (Code Division Multiple Access), EDGE (Enhanced Data Rate for GSM Evolution), Enhanced Data Rate for GSM Evolution Technology), CDMA2000, TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), HSPA (High Speed Packet Access), WCDMA (Wideband Code Division Multiple Access) Multiple Access), EVDO (Evolution Data Only), HSOPA (High Speed OFDM Packet Access), WiMAX (World Interoperability for Microwave Access) LTE (Long Term Evolution) and LTE-A (LTE-Advanced, Long Term Evolution - Advanced).
  • a wireless communication system can provide wireless coverage over a geographic area by a base station using a designated wireless channel, which is referred to as a cell.
  • the base station should be located in the center of the cell.
  • the base station can be divided into a macro base station, a micro (Pico) base station, and a femto base station.
  • a base station is also referred to as an enhanced Node B (eNodeB), and a pico base station is also referred to as a Home Base Station or a Home Enhanced Node Node (HeNodeB).
  • eNodeB enhanced Node B
  • HeNodeB Home Enhanced Node Node
  • one or more relay stations can be placed between the user equipment and the base station.
  • a relay station is equivalent to a base station.
  • the user equipment may also constitute an ad hoc network (or cluster), and a user equipment in the ad hoc network serves as a temporary control station to assist the system in management and temporary control.
  • the station can accept the control of the original control station and manage the subordinate user equipment.
  • the main processes of LTE uplink power control are:
  • the UE receives a TPC (transmitting power control);
  • the UE (user equipment) performs measurement of the received power of the downlink radio channel pilot, and calculates the path loss Pathless.
  • the UE calculates the transmit power P by using parameters such as Pathloss, uplink shared channel bandwidth, transport block format, and TPC; if the user equipment triggers PHR (power headroom report), and meet the transmission conditions, then the UE also needs to send the PHR on the uplink shared channel.
  • PHR power headroom report
  • the eNodeB (evolved base station) sends a TPC to the UE through the physical downlink control channel of the DCI Format 0/3/3A; and returns to the execution step (1).
  • the UE adopts a dynamic resource allocation mode and adopts adaptive modulation and coding (AMC).
  • AMC adaptive modulation and coding
  • the uplink transmit power of the LTE UE is related to the resource allocation and coding and modulation modes. Therefore, the individual power control modes are insufficient.
  • the PHR sent by the UE to the eNodeB is used as the resource budget information of the PUSCH, and provides a basis for the eNodeB to perform uplink resource allocation.
  • the eNodeB can allocate more radio resource blocks to the UE. If the PHR reflects that the UE has no power headroom, or does not have more power headroom, then the eNodeB can only Less radio resource blocks or low order modulation commands are allocated to the UE.
  • the PHR transmission frequency of the UE to the eNodeB is lower than the TPC transmission frequency of the eNodeB to the UE.
  • the sending of the PHR requires two steps: first, triggering, then reporting.
  • the UE triggers the PHR report when the periodic PHR timer expires or the path loss changes greatly or the PHR configuration/reconfiguration. After the UE obtains sufficient PUSCH resources for the PHR, the UE reports the PHR to the eNodeB.
  • PHR P CMAX -P ue tx
  • ⁇ 0 ⁇ is the configured maximum output power of the UE, PCMAX_L ⁇ PCMAX ⁇ PCMAX_H
  • PCMAX_L the configured maximum output power of the UE
  • PCMAX_H the configured maximum output power of the UE
  • the eNodeB controls the maximum transmit power of the UE to reduce the interference of the UE to the neighboring cell
  • the UE can design a responsible filter.
  • the UE reduces the maximum transmit power.
  • the former increases the cost of the UE, and the latter reduces the uplink capability of the UE.
  • the method of reducing the transmission power also called power reduce, PR
  • PR power reduce
  • a large number of UEs will adopt this method to achieve the requirement of out-of-band radiation.
  • the UE is not allowed to reduce power indefinitely, so that basic uplink services cannot be performed.
  • the maximum MPR Maximum Power Reduction
  • the size is related to the modulation and demodulation configuration of the transmitted data, and the occupied bandwidth. For example, in LTE, in protocol 36.101, different MPRs are set according to different transmission bandwidths and modem modes, as shown in Table 1 below: Set the actual PR value according to its own implementation, as long as PR ⁇ MPR is satisfied. Table 1
  • the UE subtracts the actual power backoff value based on the rated transmit power Ppowerclass, and also needs to consider the maximum transmit power allowed by the above network, taking the minimum of the two as the actual PCMAX.
  • the PHR is in dB and the power in the formula is in dBm.
  • the triggers reported by PHR mainly have the following three cases:
  • the PHR prohibit timer (prohibitPHR-Timer) times out, and the path loss is greater than the predetermined threshold dl-PathlossChange (in decibels dB) relative to the previous threshold of the PHR.
  • the PHR period timer (periodicPHR-Timer) times out;
  • the source of the power adjustment may be a regional SAR (Specific Absorption Rate), and the SAR requirement includes a power requirement of the user equipment when the power is close to the human body or the transmitter needs to work before the dual transmitter works. Adjustment and so on. Due to the MAX change caused by the power management of the user equipment, correspondingly, PH changes may occur. In this new situation, how the eNodeB and the user equipment evaluate the power headroom and how the user equipment performs the PHR report is an urgent problem to be solved. .
  • SAR Specific Absorption Rate
  • the current technology believes that a trigger condition should be set separately, the PHR prohibit timer (prohibitPHR-Timer) times out, and the user equipment power management value is greater than the DL-PathlossChange when the previous PHR reported the change amount. It is necessary to trigger the PHR.
  • the problem with this is: Since the threshold for reporting the amount of change is the same as the threshold for the existing path loss, the change in the power management value is actually independent of the path loss change, so the triggered PHR can easily cause false or missed reports, resulting in Resource waste or estimation error in power adjustment. In addition, if the change of the power variation in the SAR scenario is too frequent, the related PHR may be reported too much.
  • a primary object of the present invention is to provide a method and apparatus for triggering a power headroom report to at least solve the problem of inaccurate power headroom reporting in the prior art described above.
  • a power headroom report triggering method including: after a power headroom report timer expires, a user equipment triggers a power headroom report of a user equipment according to a user equipment power management influence; wherein, the user Device power management affects the amount of power change caused by user equipment power management.
  • the amount of power change caused by the power management of the user equipment is: the amount of power change caused by the power management that occurs at the current time relative to the last reported virtual power headroom reporting time.
  • the amount of power change caused by the power management of the user equipment is: the amount of power change caused by the power management that occurs at the current time relative to the last reported non-virtual power headroom reporting time.
  • the method before the power consumption report of the user equipment is triggered by the user equipment power management, the method further includes: performing filtering processing on the power management impact of the user equipment.
  • the filtering process is a layer three filtering process or a filtering process by a method of triggering the time TTT.
  • the user equipment triggers the power headroom report of the user equipment according to the power management of the user equipment, including: determining whether the power management impact of the user equipment is greater than a predetermined threshold, where the predetermined threshold is not equal to the downlink path loss threshold. ; If yes, trigger the power headroom report of the user equipment.
  • the predetermined threshold is less than the downlink path loss threshold.
  • the timeout period of the power headroom reporting timer is not equal to the timeout period of the power headroom reporting prohibition timer prohibitPHR-Timer.
  • the power headroom reporting timer is a power headroom reporting prohibition timer prohibitPHR-Timer.
  • a power headroom report triggering apparatus including: a power headroom reporting timer; and a triggering module configured to: after a power headroom reporting timer expires, according to user equipment power management impact and The path loss affects the reporting of the power headroom reported by the user equipment.
  • the power headroom report triggering further includes: a filtering module, configured to perform filtering processing on the power management impact of the user equipment.
  • the triggering module includes: a determining submodule, configured to determine whether the power management impact of the user equipment is greater than a predetermined threshold, wherein the predetermined threshold is not equal to the downlink path loss threshold; the triggering submodule is set to be in the user
  • the power headroom report of the user equipment is triggered.
  • the user equipment power headroom report is triggered according to the impact of the user equipment power management, which solves the problem of inaccurate power headroom reporting in the prior art, so that the base station side can make correct power adjustment according to the reported power headroom. , and thus achieve the effect of saving power adjustment overhead.
  • FIG. 1 is a flowchart of a power headroom report triggering method according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a power headroom report triggering method according to Embodiment 2 of the present invention
  • FIG. 3 is a flowchart according to the present invention.
  • FIG. 4 is a structural block diagram of a power headroom report triggering apparatus according to Embodiment 4 of the present invention
  • FIG. 5 is a structural block diagram of a power headroom report triggering apparatus according to Embodiment 5 of the present invention.
  • Step S104 After the power headroom reporting timer expires, the user equipment triggers the reporting of the power headroom report by the user equipment according to the power management of the user equipment; wherein, the user equipment power management affects the power variation value caused by the power management of the user equipment;
  • the user equipment power headroom report is triggered according to the power management impact of the user equipment, which solves the problem that the power headroom report is inaccurate in the prior art, so that the base station side can make correct power adjustment according to the reported power headroom. , and thus achieve the effect of saving power adjustment overhead.
  • the power headroom report timer in step S102 may be a timer in the prior art, such as a PHR prohibit timer (prohibitPHR-Timer), or may be a timer different from the prior art, and the timer is set to timeout. The time is less than or equal to the prohibitPHR-Timer timeout period.
  • filtering the instantaneous user equipment power management impact may be filtered to filter out frequently changing user equipment power impacts.
  • User equipment power management affects the amount of power change caused by user equipment power management, for example, the amount of power back-off that is limited to P-MPR, or the amount of change in P-MPR.
  • the predetermined threshold value in step S104 is a threshold value different from the existing downlink path loss change threshold value dlPathlossChange.
  • the threshold value may be independent of the downlink path loss change threshold value or may be related to the downlink path loss change threshold value.
  • the threshold is dlPathlossChange minus or plus an offset value.
  • Step S204 determining whether the power headroom timer has timed out.
  • Step S206 If the timer of the power headroom report expires, further determine whether the power management impact of the user equipment is greater than a predetermined threshold.
  • Step S208 if yes, triggering the user equipment power headroom report and restarting the power headroom report timer.
  • the power consumption of the user equipment affects the power variation caused by the power management of the user equipment, for example, the power backoff amount limited to the P-MPR, or the amount of change of the P-MPR.
  • the timer of the power headroom report may be a PHR prohibit timer (prohibitPHR-Timer) in the prior art.
  • the timer is a timer different from the prior art, and the timeout period of the timer is less than the PHR prohibit timer of the same period.
  • the predetermined threshold is different from the downlink loss change threshold (for example, dl-PathlossChange) in the prior art.
  • the predetermined threshold value may be set to a relative value of a predetermined threshold in the prior art. For example, the existing downlink path loss change threshold plus a predetermined negative or positive parameter value or the existing downlink loss change threshold is multiplied by a parameter less than or greater than 1 or directly set a lower than existing An independent threshold with a small or large threshold for changing the path loss.
  • Embodiment 3 3 is a flowchart of a method for triggering a power headroom report according to a third embodiment of the present invention. As shown in FIG. 3, the steps of the third embodiment are basically the same as those of the second embodiment, except that: the trigger power margin is increased before reporting.
  • the filtering step of the power variation step S306, to filter out the frequently changing user equipment power impact.
  • the filtering method may be an existing technology, for example, an L3 filtering method, and the power variation value of the user equipment power management value at a sampling time of a certain period, for example, 20 ms.
  • P-MPR_L a*P-MPR_L_old+( 1 -a) *P-MPR_new , where a ⁇ l, P-MPR_new is the user equipment power management value at the new sampling instant, and P-MPR——L is the filtering User equipment power management value, P-MPR_L_old is the user equipment power management value before sampling. Or it is filtered by the method of time to trigger (TTT), that is, after adding a specified time period ⁇ to the original trigger mechanism, when the power change amount changes beyond a predetermined threshold, ⁇ starts to start. If the condition persists for one cycle, the user equipment performs a PHR.
  • TTTT time to trigger
  • FIG. 4 is a structural block diagram of a power headroom report triggering apparatus according to Embodiment 4 of the present invention.
  • the apparatus includes: a power headroom reporting timer 20 and a triggering module 30.
  • the power headroom report timer 20 is coupled to the trigger module 30.
  • the triggering module 30 is configured to trigger the reporting of the power headroom reported by the user equipment according to the impact of the power management of the user equipment after the power headroom reporting timer expires.
  • FIG. 5 is a structural block diagram of a power headroom report triggering apparatus according to Embodiment 5 of the present invention. As shown in FIG.
  • the triggering module 30 further includes: a determining submodule 301 and a triggering submodule 302, in addition to the functional modules in the fourth embodiment.
  • the determining sub-module 301 is configured to determine whether the power management impact of the user equipment is greater than a predetermined threshold, where the predetermined threshold is greater than or less than a downlink path loss threshold.
  • the triggering sub-module 302 is configured to trigger a power headroom report of the user equipment if the power management impact of the user equipment is greater than a predetermined threshold.
  • the processing flow of the embodiment is the same as that of the first embodiment, that is, after the power headroom report timer expires, the user equipment triggers the report of the power headroom reported by the user equipment according to the power management impact; wherein, the user equipment power management influence is the user The power change value caused by device power management.
  • the predetermined threshold is a new threshold different from the existing downlink loss change threshold dlPathlossChange.
  • the new threshold value may be independent of the downlink path loss change threshold value, or may be related to the downlink path loss change threshold value, such as the new threshold is dlPathlossChange minus or plus an offset value.
  • the power consumption of the user equipment affects the power change value that is actually caused by the power management when the current time is compared with the previously reported virtual power headroom. That is, when in the carrier aggregation scenario, when the power headroom reported at time n is virtual, the P-MPR is artificially set to 0. At the time of n', the actual P-MPR judgment n is actually used. n' change. Or the user equipment power management affects the power change value due to power management that actually occurs at the current time relative to the previously reported non-virtual power headroom (when there is P-MPR and is not artificially set to 0).
  • the power headroom report of the user equipment is triggered according to the impact of the power management of the user equipment, which solves the problem that the power headroom report in the prior art is inaccurate.
  • the problem is that the base station side can make correct power adjustment according to the reported power headroom, thereby achieving the effect of saving power adjustment overhead.
  • the computing device may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif permettant de déclencher un rapport de marge de puissance. Ledit procédé se déroule de la manière suivante : quand un compteur de rapport de marge de puissance arrive à son terme, un équipement utilisateur déclenche, en fonction de l'influence de sa gestion de puissance, la remise par lui-même d'un rapport de marge de puissance. L'influence de la gestion de puissance de l'équipement utilisateur est une variation de puissance due à la gestion de puissance de l'équipement utilisateur. Grâce à la présente invention, le rapport de marge de puissance de l'équipement utilisateur est déclenché en fonction de l'influence de la gestion de puissance dudit équipement utilisateur, le problème des rapports de marge de puissance contenant des inexactitudes rencontré dans l'art antérieur est résolu, et le côté station de base peut donc ajuster correctement la puissance conformément à la marge de puissance rapportée, réduisant ainsi les coûts de l'ajustement de la puissance.
PCT/CN2011/077886 2011-04-28 2011-08-01 Procédé et dispositif permettant de déclencher un rapport de marge de puissance WO2012145974A1 (fr)

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CN201110108561.XA CN102761900B (zh) 2011-04-28 2011-04-28 功率余量报告触发方法及装置

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CN104053222B (zh) * 2013-03-14 2017-07-14 电信科学技术研究院 基站发射功率调整方法和装置
CN105357682B (zh) * 2015-11-27 2018-09-25 京信通信系统（中国）有限公司 一种功率余量报告的配置方法、装置及基站
CN107371229B (zh) * 2016-05-13 2022-10-11 中兴通讯股份有限公司 功率控制方法、装置及用户设备
CN109842926B (zh) * 2017-11-27 2021-06-29 华为技术有限公司 一种功率控制的方法、装置及系统
CN108401525B (zh) * 2017-12-25 2020-12-04 北京小米移动软件有限公司 功率余量报告传输方法和装置
WO2024168855A1 (fr) * 2023-02-17 2024-08-22 Apple Inc. Améliorations de rapport de réserve de puissance

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