WO2013164024A1 - Procédé de commande de puissance de signaux de référence de sondage - Google Patents

Procédé de commande de puissance de signaux de référence de sondage Download PDF

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Publication number
WO2013164024A1
WO2013164024A1 PCT/EP2012/058096 EP2012058096W WO2013164024A1 WO 2013164024 A1 WO2013164024 A1 WO 2013164024A1 EP 2012058096 W EP2012058096 W EP 2012058096W WO 2013164024 A1 WO2013164024 A1 WO 2013164024A1
Authority
WO
WIPO (PCT)
Prior art keywords
mobile station
power control
reference signals
control parameter
sounding reference
Prior art date
Application number
PCT/EP2012/058096
Other languages
English (en)
Inventor
Pablo SOLDATI
Original Assignee
Huawei Technologies Co., Ltd.
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
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/EP2012/058096 priority Critical patent/WO2013164024A1/fr
Publication of WO2013164024A1 publication Critical patent/WO2013164024A1/fr

Links

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
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • 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
    • H04W52/06—TPC algorithms
    • H04W52/08—Closed loop power control
    • 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
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • 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 a method in a wireless communication system for power control of sounding reference signals. Furthermore, the invention also relates to a method in a network control node, a method in a mobile station, a network control node device and a mobile station device, a computer program, and a computer program product thereof.
  • Sounding reference signals are transmitted by a mobile terminal to estimate the uplink (UL) channel-state information (CSI) at different frequencies.
  • the channel-state estimate can then be used to support uplink transmission, e.g. for dynamic channel-dependent scheduling, as well as to estimate the downlink (DL) channel condition assuming downlink/uplink channel reciprocity.
  • Both periodic and aperiodic SRS can be configured by a serving cell controlling the mobile terminal.
  • the 3 GPP Long Term Evolution (LTE) employs a dedicated SRS power control procedure to reduce the interference created by SRS signals and ensure good channel-state estimates.
  • PUSCH physical uplink shared channel
  • Reusing the PUSCH power control parameters for SRS transmission is sound when the mobile terminal communicates in uplink and downlink with the same network control node device, e.g. the serving cell controlling the mobile station.
  • the downlink transmission points and the uplink reception points are geographically separated network control node devices, as in the case of heterogeneous networks or so called CoMP systems.
  • Coordinated multi-point (CoMP) operation was agreed as part of the 3GPP LTE Rel-11 for downlink and uplink, 3GPP TR 36.819, implying coordinated downlink transmission and/or uplink reception from/at multiple geographically separated points, forming a so called CoMP cooperating set.
  • the existing LTE uplink power control procedures need to be enhanced. For instance, the existence of multiple reception points of the same signal transmitted from a UE (mobile station) causes the problem of determining a single basic metric that encompasses the total attenuation when a signal is jointly received at multiple reception points.
  • the transmit power control procedure for sounding reference signals in the 3 GPP LTE Rel- 8/9/10 is tied to the open-loop and closed-loop power control parameters used for the transmission of the PUSCH channel as described in equation (1). It has been argued that for CoMP operation the power control procedure for sounding reference signals needs to be enhanced due to an imbalanced uplink/downlink propagation loss and due to the existence of multiple geographically separated network devices that are intended to receive the same sounding signals. In particular, several 3GPP papers, pointed out that sounding signals targeting network devices used for uplink reception from a mobile terminal, and sounding signals targeting network control devices used for downlink transmission to the same mobile terminal, may need two different transmit power settings. Two prior art solution approaches have been proposed to address this problem.
  • the first prior art solution approach consists of a SRS power control linked to the PUSCH power control (as in the LTE Rel-10 eq. (1)) with an increased range of the power offset ⁇ SRS OFFSET, ( ot ) -
  • the increased range of the power offset is meant to compensate for the propagation loss difference between the mobile terminal and the network devices used for uplink reception and downlink transmission, so that to guarantee a higher transmission power for sounding reference signals targeting network devices associated to the downlink transmission.
  • the drawback of this approach is twofold: firstly, the power offset i3 ⁇ 4Rs oFFSET,c( OT ) i s semi-statically configured by higher layer signalling from the serving cell controlling the mobile terminal.
  • the second prior art solution approach consists of introducing a separate SRS power control process to support the downlink operation in CoMP systems in addition to the power control for uplink CoMP reception, where the additional power control process is not tied to the power control of PUSCH.
  • An object of the present invention is to provide a solution which mitigates or solves the drawbacks and problems of prior art solutions.
  • the above mentioned objects are achieved by a method for power control of sounding reference signals (SRS) in a wireless communication system comprising one or more network control nodes and one or more mobile stations, wherein mobile stations are arranged for transmitting sounding reference signals (SRS) in the uplink for estimation of radio channel states; said method comprising the steps of:
  • SRS sounding reference signals
  • a method in a network control node of a wireless communication system comprising one or more network control nodes and one or more mobile stations, wherein mobile stations are arranged for transmitting sounding reference signals (SRS) in the uplink for estimation of radio channel states; said method comprising the steps of:
  • the above mentioned objects are achieved by a method in a mobile station of a wireless communication system comprising one or more network control nodes and one or more mobile stations, wherein mobile stations are arranged for transmitting sounding reference signals (SRS) in the uplink for estimation of radio channel states; said method comprising the steps of:
  • a network control node device of a wireless communication system comprising one or more network control node devices and one or more mobile station devices, wherein mobile station devices are arranged for transmitting sounding reference signals (SRS) in the uplink for estimation of radio channel states;
  • SRS sounding reference signals
  • a mobile station device of a wireless communication system comprising one or more network control node devices and one or more mobile station devices, wherein mobile station devices are arranged for transmitting sounding reference signals (SRS) in the uplink for estimation of radio channel states; said mobile station device being arranged to:
  • SRS sounding reference signals
  • the invention also relates to a computer program and a computer program product.
  • the present invention provides a solution that enhances the power control of sounding reference signals of conventional radio cellular systems for the case of a wireless communication system with coordinated multi-point transmission and reception.
  • the power control of sounding reference signals is enhanced by introducing a new parameter.
  • the new parameter provides a power adjustment for sounding reference signals used to estimate the downlink radio channel.
  • the present invention provides a solution for power control of sounding reference signals that, by introducing a new parameter within a current power control procedure of sounding reference signals used to estimate the uplink radio channel, can dynamically switch from a power control of sounding reference signals used to estimate the uplink radio channel to a power control of sounding reference signals used o estimate the downlink radio channel.
  • the present invention also enables to adjust the transmit power of sounding reference signals on a millisecond time-scale with minimal network signalling overhead and implementation complexity , when said sounding reference signals are used to estimate the downlink radio channel.
  • Fig. 1 illustrates a CoMP configuration with unbalanced uplink and downlink propagation loss
  • FIG. 2 illustrates an embodiment of the present invention. Detailed Description of the Invention
  • the present invention relates to a method for power control of SRSs transmitted in the uplink in a wireless communication system.
  • the method comprises the steps of: calculating, by at least one network control node, a power control parameter g when a downlink transmission to a mobile station is scheduled relating to a previous uplink transmission of SRSs from the mobile station; transmitting, by a network control node, the power control parameter g to the mobile station; receiving, by the mobile station, the power control parameter g; calculating, by the mobile station, a transmit power P for transmission of SRSs by using the power control parameter g; and transmitting, by the mobile station, SRSs with the calculated transmit power P.
  • the invention also relates to corresponding methods in a network control node and a mobile station.
  • the present method embeds an additional closed-loop mechanism within an existing SRS power control procedure with the objective of correcting the SRS transmit power when the SRSs shall reach downlink transmission points.
  • Fig. 2 illustrates the present method - when a downlink transmission to a mobile station is scheduled relating to a previous uplink transmission of SRSs from the mobile station, the network control node computes a power control parameter g that shall be used for power control of the SRSs.
  • the network control node computes the parameter g in an earlier subframe where a transmission of SRSs from the mobile station were scheduled.
  • the network control node calculating the power control parameter g is the network control node (with associated serving cell) that controls the mobile station.
  • the power control parameter g is expressed in dB, and may be signalled to the mobile station in a transmit power command (TPC) comprised in downlink control information, e.g. in a suitable control channel such as the physical downlink control channel (PDCCH) or the enhanced physical downlink control channel (ePDCCH) in LTE systems.
  • the power control parameter g is also preferably mobile station (UE) specific.
  • the transmit power command is represented by N number of bits, these N bits indicating different values for the power control parameter g.
  • the N bits specifying a mapping between a transmit power adjustment (expressed in dB) calculated at a serving cell controlling the mobile station and a finite set of possible transmit power adjustments.
  • An N-bit bitmap can be is used at the serving cell to map the calculated power adjustment g into a finite set of valued to be conveyed to the mobile station as the state of N information bits forming a transmit power control command.
  • the bitmap used by the serving cell to create the transmit power control command shall be known at the mobile station.
  • Table 1 An example of a simple 2-bit bitmap is, but not limited to, given in Table 1 below.
  • Table 1 the difference between a target received power in the uplink and the actual received power in the uplink for a previous transmission of SRSs is mapped into four values of g.
  • the mapping described in Table 1 is arbitrary and not limiting for the invention.
  • the calculated transmit power P is a minimum of: maximum allowed transmit power, and a sum of a value for the power control parameter g and a transmit power for the previous transmission of SRSs.
  • the maximum allowed power is the maximum transmit power the mobile station can use for transmission of SRS.
  • the present embodiment enables to dynamically adjust the transmit power of SRS by implicitly distinguishing whether the SRSs are used to estimate the uplink radio channel or the downlink radio channel.
  • the calculated transmit power P may be derived from the equation:
  • g i) is either the value of g received from the network control node as e.g. TPC for the transmission of SRS in subframe i, or zero if no TPC was issued for the transmission of SRS in subframe i according to an embodiment
  • P(i) and P MAX are defined according to 3GPP TS 36.213 Release 10, i.e. :
  • P CMAX (i) is the maximum uplink configured transmit power
  • S RS is the bandwidth of the SRS transmission in subframe i expressed in number of resource blocks
  • P 0 PUSCH (J) denoted the desired received power level per resource block set by higher layers by the serving cell controlling the mobile terminal;
  • PL c is the path loss estimate calculated in the mobile terminal in decibels
  • ccc(j) is a parameter provided by higher layers from the serving cell controlling the mobile terminal;
  • f c (i) is the current power control adjustment state sent to the mobile terminal from the for serving cell controlling the mobile terminal for uplink data channel power control.
  • 3GPP TS 36.213 Release 10 can also be useful, i.e.
  • the present invention embeds an additional closed-loop mechanism within the existing SRS power control procedure with the objective of correcting the SRS transmit power when the SRSs shall reach downlink transmission points.
  • the power control parameter g the following two main approaches may be used depending on where in the system the parameter is calculated.
  • the power control parameter g is set to zero if the mobile station does not receive any power control parameters related to the transmission of the SRSs.
  • the power control parameter g is calculated as a difference between a target received power in the uplink and an actual received power in the uplink for an earlier subframe where a SRS transmission from the mobile station is scheduled
  • power control parameter g is set to a predefined maximum transmission power value by a network control node controlling the mobile station if the SRSs are not received by any network control nodes of the system.
  • a plurality of network control nodes is associated with the downlink transmission to the mobile station.
  • each of them may calculate a power control parameter gj for the mobile station. Therefore, one power control parameter g has to be selected among a plural of power control parameters calculated by the different network control nodes.
  • This scenario is typical with coordinated multi-point operation, such as CoMP LTE, where a plurality of network control nodes is associated with the downlink transmission to a mobile station. It has been realized that one preferable selection criteria is to select the power control parameter g having a largest value among the plural power control parameters gj.
  • each of the power control parameters gj represents the required power adjustment for SRS to be correctly received at the network control node computing the power control parameter
  • selecting the power control parameter g as the largest value among the plural power control parameters gj ensures that the SRS are correctly received at the network control node with the worst channel conditions.
  • other selection criteria are possible.
  • any method according to the present invention may also be implemented in a computer program, having code means, which when run by processing means causes the processing means to execute the steps of the method.
  • the computer program is included in a computer readable medium of a computer program product.
  • the computer readable medium may comprises of essentially any memory, such as a ROM (Read-Only Memory), a PROM (Programmable Read-Only Memory), an EPROM (Erasable PROM), a Flash memory, an EEPROM (Electrically Erasable PROM), or a hard disk drive.
  • the present invention also relates to a network control node device and a mobile station device. It should also be realised that the network control node device and the mobile station device may be modified, mutatis mutandis, according to the different embodiments of the corresponding methods.
  • the term mobile station is used generically for all suitable mobile device such as mobile terminals, user equipment, etc.
  • the network control node device is a network device which has the necessary functions to calculate the new parameter.
  • the network control node device may also preferably also have the means to control the mobile station in the system.

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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 porte sur un procédé de commande de puissance de signaux de référence de sondage (SRS) dans un système de communication sans fil comprenant un ou plusieurs nœuds de commande de réseau et une ou plusieurs stations mobiles, des stations mobiles étant conçues pour émettre des signaux de référence de sondage (SRS) en liaison montante pour une estimation d'états de canal radio; ledit procédé comprenant les étapes consistant à : calculer, par au moins un nœud de commande de réseau, un paramètre de commande de puissance g lorsqu'une transmission en liaison descendante à destination d'une station mobile est planifiée relativement à une transmission en liaison montante précédente de signaux de référence de sondage (SRS) en provenance de ladite station mobile; transmettre, par un nœud de commande de réseau, ledit paramètre de commande de puissance g à ladite station mobile; recevoir, par ladite station mobile, ledit paramètre de commande de puissance g; calculer, par ladite station mobile, une puissance d'émission P pour l'émission de signaux de référence de sondage (SRS) par utilisation dudit paramètre de commande de puissance g; et émettre, par ladite station mobile, des signaux de référence de sondage (SRS) à ladite puissance d'émission P calculée. En outre, l'invention porte également sur un procédé dans un nœud de commande de réseau, un procédé dans une station mobile, un dispositif de nœud de commande de réseau et un dispositif de station mobile, un programme d'ordinateur et un produit programme d'ordinateur associés.
PCT/EP2012/058096 2012-05-03 2012-05-03 Procédé de commande de puissance de signaux de référence de sondage WO2013164024A1 (fr)

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PCT/EP2012/058096 WO2013164024A1 (fr) 2012-05-03 2012-05-03 Procédé de commande de puissance de signaux de référence de sondage

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
US20140334424A1 (en) * 2010-09-28 2014-11-13 Qualcomm Incorporated Methods and apparatus for power management in a wireless communication system
US9497714B2 (en) 2010-09-24 2016-11-15 Qualcomm Incorporated Power control for a network of access points
US20170208516A1 (en) * 2016-01-20 2017-07-20 Qualcomm Incorporated Techniques for providing uplink-based mobility
WO2019137051A1 (fr) * 2018-01-12 2019-07-18 中兴通讯股份有限公司 Procédé de contrôle de puissance, premier nœud de communication, et second nœud de communication
WO2021018078A1 (fr) * 2019-07-30 2021-02-04 中兴通讯股份有限公司 Procédé et dispositif de transmission et support de stockage lisible par ordinateur
CN113271656A (zh) * 2020-02-14 2021-08-17 上海诺基亚贝尔股份有限公司 定位参考信号的功率控制

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WO2010124241A2 (fr) * 2009-04-23 2010-10-28 Qualcomm Incorporated Signal de référence de sondage pour fonctionnement multipoint coordonné

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WO2010124241A2 (fr) * 2009-04-23 2010-10-28 Qualcomm Incorporated Signal de référence de sondage pour fonctionnement multipoint coordonné

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9497714B2 (en) 2010-09-24 2016-11-15 Qualcomm Incorporated Power control for a network of access points
US20140334424A1 (en) * 2010-09-28 2014-11-13 Qualcomm Incorporated Methods and apparatus for power management in a wireless communication system
US9451480B2 (en) * 2010-09-28 2016-09-20 Qualcomm Incorporated Methods and apparatus for power management in a wireless communication system
US20170208516A1 (en) * 2016-01-20 2017-07-20 Qualcomm Incorporated Techniques for providing uplink-based mobility
US11026142B2 (en) * 2016-01-20 2021-06-01 Qualcomm Incorporated Techniques for providing uplink-based mobility
US11510122B2 (en) 2016-01-20 2022-11-22 Qualcomm Incorporated Techniques for providing uplink-based mobility
WO2019137051A1 (fr) * 2018-01-12 2019-07-18 中兴通讯股份有限公司 Procédé de contrôle de puissance, premier nœud de communication, et second nœud de communication
US11452052B2 (en) 2018-01-12 2022-09-20 Zte Corporation Power control method, first communication node, and second communication node
WO2021018078A1 (fr) * 2019-07-30 2021-02-04 中兴通讯股份有限公司 Procédé et dispositif de transmission et support de stockage lisible par ordinateur
CN113271656A (zh) * 2020-02-14 2021-08-17 上海诺基亚贝尔股份有限公司 定位参考信号的功率控制
CN113271656B (zh) * 2020-02-14 2022-12-30 上海诺基亚贝尔股份有限公司 定位参考信号的功率控制

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