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WO2013005014A1 - Gestion d'interférence pour des déploiements de porteuse à cheval - Google Patents

Gestion d'interférence pour des déploiements de porteuse à cheval Download PDF

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Publication number
WO2013005014A1
WO2013005014A1 PCT/GB2012/051537 GB2012051537W WO2013005014A1 WO 2013005014 A1 WO2013005014 A1 WO 2013005014A1 GB 2012051537 W GB2012051537 W GB 2012051537W WO 2013005014 A1 WO2013005014 A1 WO 2013005014A1
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WO
WIPO (PCT)
Prior art keywords
pathloss
user equipment
basestation
measurements
power
Prior art date
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Ceased
Application number
PCT/GB2012/051537
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English (en)
Inventor
Alan James Auchmuty Carter
Gbenga SALAMI
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Ubiquisys Ltd
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Ubiquisys Ltd
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Filing date
Publication date
Application filed by Ubiquisys Ltd filed Critical Ubiquisys Ltd
Publication of WO2013005014A1 publication Critical patent/WO2013005014A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/347—Path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/225—Calculation of statistics, e.g. average or variance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [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
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [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
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission
    • H04W52/282—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission taking into account the speed of the mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission
    • H04W52/285—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non-transmission taking into account the mobility of the user

Definitions

  • This invention relates to interference management, and in particular to methods and systems for setting power levels in a basestation of a cellular communications network, in order to manage levels of interference between devices in the network.
  • the invention is particularly, though not necessarily exclusively, relevant to setting power levels in a basestation in a small cell, or in a femtocell basestation.
  • WCDMA Wideband Code Division Multiple Access
  • UMTS Universal Mobile Telecommunications System
  • the second group of operators are those that may only have two UMTS carriers and do not have the luxury of assigning a relatively unused carrier to the femtocell population. Interference management is a relevant concern for this group of operators. Operators that fall within this group might for example have a spectrum policy whereby a single UMTS Rel 99 camping carrier is deployed throughout the operator's territory, and a Rel 99 and/or HSDPA (High Speed Downlink Packet Access) capacity carrier is deployed in certain regions of the territory. In general, HSDPA enabled phones are handed over to the HSDPA carrier when a call is established, and may remain on this carrier after the call is concluded. Alternatively, in certain deployments, the user may return to the camping carrier after call termination.
  • HSDPA High Speed Downlink Packet Access
  • a 2G GSM (Global System for Mobile communications) voice layer that is also deployed throughout the region and is used to provide coverage when there is no 3G coverage.
  • femtocells there are three options available to an operator deploying femtocells, namely (a) deploying the femtocells on the Rel 99 camping carrier (b) deploying the femtocells on the HSDPA carrier or (c) deploying the femtocells straddling (i.e. midway between) the Rel 99 and HSDPA carriers.
  • the UMTS standard can support up to three different Universal Terrestrial Radio Access (UTRA) Absolute Radio Frequency Channel Numbers (UARFCNs) in the Idle mode neighbour cell lists, including the serving UARFCN).
  • UTRA Universal Terrestrial Radio Access
  • URFCNs Absolute Radio Frequency Channel Numbers
  • a method of controlling the downlink power of a basestation in a cellular communications network comprising:
  • the measure of the pathloss is formed based on a plurality of pathloss measurements
  • Figure 1 illustrates a cellular communications network, in accordance with an aspect of the invention
  • Figure 2 illustrates a femtocell basestation, in accordance with an aspect of the invention
  • Figure 3 is a flow chart, illustrating an RRM configuration algorithm in accordance with an aspect of the present invention
  • Figure 4 is a flow chart, illustrating a method for setting a downlink power of a femtocell basestation, in accordance with an aspect of the invention
  • Figure 5 illustrates a step in the method of Figure 4.
  • Figure 1 shows a part of a cellular communications network 10.
  • FIG. 1 shows a macrolayer basestation 12, having a dedicated connection in to a core network (CN) 14 of the cellular communications network.
  • the macrolayer basestation 12 provides cellular service across a coverage area.
  • a building 16 which contains a femtocell basestation 18, which in this example is connected in to the core network (CN) 14 of the cellular communications network by means of an existing broadband internet connection 20.
  • CN core network
  • UE devices 22, 24, such as mobile phones, smartphones, internet access devices, portable computers or the like, are located in the coverage area of the network outside the building 16, while a user equipment device 26 is located within the building 16.
  • UE devices 22 such as mobile phones, smartphones, internet access devices, portable computers or the like.
  • FIG. 2 shows the femtocell basestation, or femto access point (AP), 18 in more detail.
  • the femtocell basestation 18 includes radio transceiver (TRX) circuitry 22.
  • the TRX circuitry 22 detects signals received by an antenna 24.
  • the TRX circuitry 22 is able to receive signals transmitted by UE devices on assigned system uplink (UL) frequencies, but is also able to receive signals transmitted by other basestations on assigned system downlink (DL) frequencies.
  • the TRX circuitry 22 also converts signals into a suitable form for transmission over the radio interface.
  • the femtocell basestation 18 also includes an internet interface 26, for establishing the connection over the internet to the core network 14 of the cellular network.
  • the femtocell basestation 18 operates under the control of a processor 28, which is responsible for various functions. The operation of the processor 28 will be described herein only to the extent required for an understanding of the present invention.
  • MNO Mobile Network Operator
  • RAN Radio Access Network
  • basestation 's RF parameters such as carrier frequency, transmit power levels, DL primary scrambling codes, neighbour cell lists etc.
  • RF parameters such as carrier frequency, transmit power levels, DL primary scrambling codes, neighbour cell lists etc.
  • a different approach to deployment is required, such as automatic configuration.
  • the femtocells are expected to coexist with the existing MNO networks, with the possibility of sharing radio resources such as carrier frequencies, and this presents a whole new set of challenges.
  • Radio Frequency (RF) interference impacts from the femto network and this requires careful control of femtocell RF parameters, so that the positive benefits of femtocells can be realised without causing impacts to the existing macro network.
  • RF Radio Frequency
  • the inputs to the Radio Resource Management (RRM) auto-configuration algorithms come mainly from measurements and information derived from the femto AP's network scanning function known as the Network Listen Mode.
  • the Network Listen Mode has two operational states, namely the Down Link Monitor Mode (DLMM) and the Fast Sniff Mode (FSM).
  • DLMM is typically invoked at power on to scan the surrounding 3G WCMDA and 2G GSM basestations, including neighbouring femto APs. This involves measuring signals levels, decoding broadcast channels and extracting radio frequency (RF) parameters associated with the surrounding macro network.
  • RF radio frequency
  • the FSM is periodically invoked after power on when the AP is idle, to collect short samples off the downlink (WCDMA and GSM), and in the process continuously refreshing information held about macro neighbours and neighbouring APs detected during previous DLMM runs, while also building up information on any newly detected macro neighbours or neighbouring APs.
  • the inputs to the RRM algorithms are complemented by UE measurements collected as users move around the femto AP coverage area, to help fine tune the femto APs RF parameters.
  • Figure 3 is a flow chart, showing a summary of the RRM process in the femtocell basestation 18, which may for example be a residential femtocell AP.
  • the femto AP On powering up, the femto AP connects to an access point management system (AP-MS) in the core network 14, runs through a series of diagnostic functions (i.e. self check, register with the management system, download most recent software load etc) and sets up its IP network configurations. Following the successful hardware and system configuration, the femto AP goes through a radio frequency (RF) auto-configuration. This auto- configuration occurs in several stages.
  • AP-MS access point management system
  • diagnostic functions i.e. self check, register with the management system, download most recent software load etc
  • RF radio frequency
  • the femto AP downloads (step 50 in Figure 3) from the management system RF parameters, such as the Universal Terrestrial Radio Access (UTRA) Absolute Radio Frequency Channel Numbers (UARFCNs), the maximum and minimum allowed total DL/UL transmit power levels, and the femto AP DL primary scrambling codes.
  • UTRA Universal Terrestrial Radio Access
  • URFCNs Universal Terrestrial Radio Access
  • DLMM Downlink Monitor Mode
  • BCH broadcast channels
  • SIBs System Information Blocks
  • RF optimisation takes place, as described in more detail below.
  • Down Link Monitor Mode is typically activated (step 52 in Figure 3) at power up, once per day, or when a change to the surrounding 3G WCDMA environment is detected by the FSM.
  • the femto AP can determine whether RF conditions are poor (step 54 in Figure 3), and, if so, can raise an alarm in step 56.
  • the femto AP performs a cell search and measurements on all possible carriers that it is allowed to operate on, as indicated by the management system, in order to detect the nearby 3G WCDMA or 2G GSM macrocells and any collocated femto AP primary scrambling codes.
  • the capabilities of DLMM include: detection of surrounding WCDMA basestations, including other femto APs and GSM basestations;
  • CPICH Common Pilot Channel
  • RSCP Received Signal Code Power
  • CPICH Ec/lo Relative Common Pilot Channel Energy per chip versus Noise
  • RSSI measurements on detected surrounding GSM basestations RSSI measurements on detected surrounding GSM basestations; extraction of cell system information from Broadcast Channels of detected WCDMA and GSM basestations, such as neighbour cells lists, cell ID, mobility parameters, CPICH transmit (Tx) Power, etc.; calculation of frequency offsets from detected surrounding 3G WCDMA and 2G GSM macrocells, which are used to correct for frequency drift in the femto AP's local frequency reference.
  • the detections and measurements made in the DLMM are used as inputs to the initial auto-configuration of the femto AP's RF parameters such as UARFCN carrier, primary scrambling codes, neighbour cell lists and DL/UL power setting (step 58 in Figure 3).
  • the access point can enter service in step 60 of Figure 3.
  • the femtocell access point can obtain information from UE measurement reports. This allows further control of RF parameters. For example, downlink and uplink powers can be optimised (step 62 in Figure 3), based on the femto AP UE measurement reports. The optimisation aims to minimise radio frequency (RF) leakage, and dead zones, outside the intended AP coverage area, and to avoid an uplink noise rise to the surrounding macrolayer (ML) node Bs.
  • RF radio frequency
  • HSDPA High Speed Downlink Packet Access
  • dynamic management of a noise rise target for High Speed Uplink Packet Access HSUPA can be performed (step 66 in Figure 3), aiming to limit the HSUPA power whenever HSUPA sessions could impact Release 99 services in the uplink.
  • DCH power management can be performed (step 68 in Figure 3) for DCHs, aiming to ensure that total DCH power available is available to all DCHs as needed, while also ensuring fair distribution of resources across DCHs.
  • DCH dynamic dedicated channel
  • DL/UL radio access bearer (RAB) rate adaption can be performed (step 70 in Figure 3) for Release.99 packet switched (PS) sessions that will reconfigure RABs to a lower data rate, for example when experiencing interference, and will restore the RAB to a higher data rate at an appropriate time, for example when no longer experiencing interference.
  • PS packet switched
  • UE measurements relating to basestations that it can detect can also be used (step 72 in Figure 3) to monitor for new macrolayer basestations on the same frequency as the femtocell.
  • FSM Fast Sniff Mode
  • the femto AP After successful power on, Fast Sniff Mode (FSM) is activated (step 80 in Figure 3) whenever the AP is idle (i.e. there is no active voice or data session in progress).
  • the femto AP In Fast Sniff Mode, the femto AP periodically (for example, every 90 seconds) tunes to the 3G WCDMA and 2G GSM DL frequency band, and samples the DL for about 20 milliseconds.
  • the detections, measurements made and information gathered by the FSM are used to update the femto AP's RF parameters, as indicated by step 82 in Figure 3. For example, neighbour cell lists are updated if a new WCDMA macro cell is detected. If changes, or significant events, are detected in the RF environment using the Fast Sniff Mode (FSM) of the Network Listen Mode function, this could indicate that that the initial RF parameters selected are no longer optimal, and could be used to trigger a rerun of the DLMM process for auto-configuration of the parameters in question.
  • FSM Fast Sniff Mode
  • one element of the interference management for the femtocell is the setting of the total downlink power as a function of the surrounding macro layer interference levels.
  • the AP will automatically and continuously adjust its DL power as shown in Figure 4.
  • the aim of this process is that the CPICH Ec/No of the femtocell is of sufficient quality to provide adequate coverage and performance for UEs on that cell within the expected femto coverage area, while causing minimal impact to macro layer CPICH Ec/lo quality.
  • the femtocell uses the DLMM and FSM to set the initial down link power and then uses the FSM and UE measurements to continue to adapt the down link power.
  • the process involves calculating statistics of the pathloss from the femtocell to the UE in the form of a histogram (step 100), as described in more detail below; calculating a loading margin (step 102), again as described in more detail below; and calculating a target value for the RSCP (step 104).
  • the target value for the RSCP can be calculated in any convenient manner, but Figure 4 shows at 106 one possible way of calculating the target RSCP.
  • the Majority_ZL_Pathloss 95 th percentile of the femto cell to UE path loss.
  • these measurements are gathered in a histogram (step 100) at times when the UE is considered to be mobile and not stationary over a window of time. Further details of the mobility detector are provided below.
  • the Target_RSCP when deployed on a clear carrier is a minimum RSCP value (typically -105dBm, where dBm is an abbreviation for the power ratio in decibel (dB) of the measured power referenced to one milliwatt) and acts as a floor.
  • a minimum RSCP value typically -105dBm, where dBm is an abbreviation for the power ratio in decibel (dB) of the measured power referenced to one milliwatt
  • dBm decibel
  • the Fixed_Loading_Offset is a database parameter that can be used to bias the maximum DL Transmit power.
  • the Loading_Margin is an additional power that is added to account for variability of the macro layer interference within the building and inter-cell interference caused by network loading. The determination of this Loading_Margin is described in more detail below.
  • the calculation of the downlink power relies on statistics relating to the variations in the pathloss between the femtocell and a UE that is within the coverage area of the femtocell.
  • the pathloss can be measured at various times, and the results used to generate these statistics.
  • a UE might remain stationary at one specific location within the coverage area for considerable periods of time. If so, the pathloss measurements at that location will have an undesirably large impact on the statistics.
  • a UE mobility detector algorithm is therefore used to detect whether a user is mobile or stationary. If a user is mobile, then the UE measurements would provide a good path loss fingerprint of the building.
  • the UE measurements would only provide the pathloss to a single point (or localized point) in the building, and would not provide a fingerprint of the pathloss throughout the expected coverage area.
  • the intra frequency measurements reports of the Received Signal Code Power (RSCP) and CPICH Ec/lo on the pilot channel are typically reported every second by the UE.
  • the path-loss measurement between the UE and the femto access point is calculated by subtracting the RSCP from the CPICH transmit power of the femto.
  • the mobility detector works by performing a stationary check on a sample set after every N th sample is received. The stationary check is based on the statistical variance of the samples received. This is compared against a stationary threshold.
  • the stationary threshold is a database parameter set at 10. The set of N samples which pass the stationary check are then used in the calculation of the Downlink femto transmit power.
  • Figure 5 shows the simulation results for the mobility detector.
  • the plot of the stationary variance versus the FAP operational time is shown.
  • the period showing the peaks above 10 indicate the period when the UE was mobile and the sample are used to adapt the downlink powers.
  • the stationary periods are also shown from 1 1 to 36 minutes on the horizontal axis.
  • the variance is calculated as:
  • the pathloss is calculated at regular intervals. Then, after every N samples, the N calculated pathloss values are compared with the mean of those N pathloss values. The N differences are squared, and the variance, or mean square difference o 2 is formed. Then, it is determined whether that variance exceeds a threshold value. If so, it is determined that the UE was moving during the time period covered by those N samples, and the calculated pathloss values from that period are used in calculating the downlink power. If the variance does not exceed the threshold value, it is determined that the UE was not moving during the time period covered by those N samples, and the calculated pathloss values from that period are ignored in calculating the downlink power.
  • the threshold value can also be made adaptable. For example, if the mean path loss is large (i.e. the user is some distance from the femtocell) for a particular sample set, then it could be expected that (assuming the same user behaviour) the variance of the path loss sample would be smaller than the variance of the path loss sample set when the average is lower (i.e. user is closer to femtocell). Such variability is to be expected due to radio propagation differences. Hence, the algorithm could bias the threshold value downwards as the average pathloss of the sample set increases. Alternatively, the algorithm could bias the threshold value upwards as the average path loss of the sample set decreases.
  • the mobility detector is used to obtain an improved pathloss fingerprint of the coverage area of the FAP.
  • the pathloss statistics obtained from the process are then used to dynamically adjust the femto (FAP) downlink power.
  • the calculation in step 108 also uses a value for a Loading Margin, as determined in step 102. That is, the adaptive down link femto cell power adaptation algorithm makes use of an ongoing downlink load margin calculation to determine the level of macro layer interference within the building. Although applicable to all spectrum deployments (clear carrier, occupied carrier and straddled carrier) this solution is of particular importance for a straddled carrier deployment as there is no macro layer RSCP measurement to provide an interference reference.
  • the calculation uses an X/Y clustering type algorithm, which excludes the effect of intra-cell loading and only reacts to the inter-cell interference. Intra-cell interference is essentially negated by the Orthogonal Variable Spreading Factor (OVSF) code orthogonality on the down link of a small cell.
  • the load margin calculation uses a X/Y cluster algorithm which is based on a combination of the 90% Transmit Code Power (referred to below as the majority_Tx_code_power) and the CPICH Ec/No (referred to below as the
  • Majority_ZL_EcNo Majority_ZL_EcNo measurements to determine the appropriate load margin.
  • the target CPICH Ec/No and the target transmit code power are typically set as database parameters. Alternatively, the target transmit code power could also be calculated adaptively as a function of femtocell loading.
  • the Transmit Code Power histogram (from whence the 90% is calculated) is gathered from layer 1 DL DCH code power measurements gathered across all calls - irrespective of service.
  • Load_margin Medium Loadmargin
  • Load_margin Low_Loadmargin
  • step 1 10 calculates a desired value, using a maximum value for the downlink power decrease, so that the desired value does not fluctuate excessively. Then, in step 1 12, the maximum downlink power value is set, to ensure that the desired value falls between the maximum and minimum allowed values obtained from the management system.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Quality & Reliability (AREA)
  • Electromagnetism (AREA)
  • Probability & Statistics with Applications (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de commande de la puissance de liaison descendante d'une station de base dans un réseau de communication cellulaire. La puissance de liaison descendante est commandée sur la base d'une mesure de la perte de trajet entre la station de base et au moins un dispositif d'équipement utilisateur dans une zone de couverture de la station de base. La mesure de la perte de trajet est formée sur la base d'une pluralité de mesures de perte de trajet. Une pluralité de mesures de perte de trajet sont réalisées, et, pour chaque mesure de perte de trajet, il est déterminé si l'équipement utilisateur est en mouvement ou immobile à l'instant où la mesure de perte de trajet est réalisée. Seules les mesures de perte de trajet réalisées lorsque l'équipement utilisateur est en mouvement sont utilisées lors de la formation de la mesure de la perte de trajet.
PCT/GB2012/051537 2011-07-01 2012-06-29 Gestion d'interférence pour des déploiements de porteuse à cheval Ceased WO2013005014A1 (fr)

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GB1111256.2 2011-07-01
GB1111256.2A GB2492409B (en) 2011-07-01 2011-07-01 Interference management for straddled carrier deployments

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US7398099B2 (en) * 2002-03-08 2008-07-08 Telefonaktiebolaget L M Ericsson (Publ) System and method for speed indication through transmit power control commands
US7869822B2 (en) * 2003-02-24 2011-01-11 Autocell Laboratories, Inc. Wireless network apparatus and system field of the invention
CA2516725A1 (fr) * 2003-02-24 2004-09-10 Autocell Laboratories, Inc. Systeme et procede de protocole d'acces sans fil
US8700083B2 (en) * 2007-08-10 2014-04-15 Qualcomm Incorporated Adaptation of transmit power based on maximum received signal strength

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GB2381417A (en) * 2001-10-24 2003-04-30 Ipwireless Inc Transmission power control based on path loss
WO2008112849A2 (fr) * 2007-03-13 2008-09-18 Qualcomm Incorporated Procédé et appareil de commande de puissance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109495960A (zh) * 2018-11-21 2019-03-19 Tcl移动通信科技（宁波）有限公司 远程调节路由器发射功率的方法、移动终端及存储介质

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GB2492409A (en) 2013-01-02
GB2492409B (en) 2015-07-08

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