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WO2010151196A1 - Procede et agencement dans un reseau de communications sans fil pour l'adaptation de reglage de commande de puissance - Google Patents

Procede et agencement dans un reseau de communications sans fil pour l'adaptation de reglage de commande de puissance Download PDF

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Publication number
WO2010151196A1
WO2010151196A1 PCT/SE2009/051038 SE2009051038W WO2010151196A1 WO 2010151196 A1 WO2010151196 A1 WO 2010151196A1 SE 2009051038 W SE2009051038 W SE 2009051038W WO 2010151196 A1 WO2010151196 A1 WO 2010151196A1
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WIPO (PCT)
Prior art keywords
value
srs
user equipment
deciding
power control
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/SE2009/051038
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English (en)
Inventor
David Astely
Magnus Lundevall
Jessica ÖSTERGAARD
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Publication of WO2010151196A1 publication Critical patent/WO2010151196A1/fr
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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
    • H04W52/146—Uplink power control
    • 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]
    • H04W52/30—Transmission power control [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. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure

Definitions

  • the present invention relates to a method and an arrangement in a radio network node, a method and an arrangement in signalling device, and a method and an arrangement in a wireless communications network.
  • it relates to adapting the Sounding Reference Signal "SRS" power control setting in the user equipment.
  • SRS Sounding Reference Signal
  • wireless terminals also known as mobile stations and/or User Equipment units (UEs) communicate via a Radio Access Network (RAN) to one or more core networks.
  • the wireless terminals can be mobile stations or user equipment units such as mobile telephones also known as "cellular" telephones, and laptops with wireless capability, e.g., mobile termination, and thus can be, for example, portable, pocket, hand-held, computer- included, or car-mounted mobile devices which communicate voice and/or data with radio access network.
  • the radio access network covers a geographical area which is divided into cell areas, with each cell area being served by a base station, e.g., a Radio Base Station (RBS) 1 which in some networks is also called "NodeB" or "B node” and which in this document also is referred to as a base station.
  • a cell is a geographical area where radio coverage is provided by the radio base station equipment at a base station site. Each cell is identified by an identity within the local radio area, which is broadcast in the cell.
  • the base stations communicate over the air interface operating on radio frequencies with the user equipment units within range of the base stations.
  • the Universal Mobile Telecommunications System (UMTS) is a third generation mobile communication system, which evolved from the Global System for Mobile Communications (GSM).
  • GSM Global System for Mobile Communications
  • 3GPP Third Generation Partnership Project
  • 3GPP has undertaken to evolve further the UTRAN and GSM based radio access network technologies.
  • this work regarding the 3G Long Term Evolution (LTE) system is ongoing
  • Sounding reference signals are known signals that are transmitted in the uplink from user equipments, so that the base station can estimate the uplink channels.
  • the channel estimates may be used for uplink Radio Resource Management (RRM) such as scheduling, link adaptation and power control, but also for downlink multiple antenna transmission and RRM 1 especially in case of Time Division Duplex (TDD) where the uplink and downlink use the same frequencies.
  • RRM Radio Resource Management
  • TDD Time Division Duplex
  • SRS may also be used to derive timing-control commands for uplink time alignment.
  • LTE Long Term Evolution
  • OFDM Orthogonal Frequency Division Multiplexing
  • UEs are configured by higher layers to transmit sounding reference signals in the last symbol of one or several Up Link (UL) subframes, or in case of TDD, in Uplink Part of Time Slot (UpPTS), which is a short uplink time slot with configurable length of one or two OFDM symbols positioned right after the guard period at a switch from downlink to uplink.
  • UpPTS Uplink Part of Time Slot
  • TDM time division multiplexing
  • different UEs may be separated in the sense that different UL subframes or different symbols in UpPTS are used.
  • SRS are transmitted using a repetition factor of two meaning that every second subcarrier is used.
  • code division multiplexing CDM may also be used within a set of subcarriers in the same OFDM symbol. More specifically, different cyclic shifts of a Zhadoff-Chu sequence are used for this purpose.
  • SRS transmissions are configured with * a certain bandwidth, indicating how many resource blocks (in the frequency domain) the sounding reference signal will cover and the starting position in the frequency domain
  • SRS transmissions are power controlled.
  • the SRS power control formula resembles the power control used for the data channel, the Physical Uplink Shared Channel (PUSCH).
  • the SRS power control involves e.g. compensation for the bandwidth used for sounding, e.g. using more power when the SRS uses larger bandwidth to keep the received power spectral density independent of the sounding bandwidth, compensation for the long-term estimate of noise and interference in the cell, and compensation for the UE's pathloss.
  • the goal of the power control is to make sure that uplink transmission of data on PUSCH and control on Physical Uplink Control Channel (PUCCH) is received at a desired quality level.
  • PUCCH Physical Uplink Control Channel
  • parameters in the UE are configurable. When the main purpose of SRS is to estimate uplink channel quality for scheduling and data transmission, parameters such as pathloss compensation are the same as for the PUSCH transmission so that the quality estimated from SRS are applicable to uplink data transmissions on PUSCH.
  • the parameter ⁇ used for SRS matches the ⁇ used for the PUSCH.
  • the object is achieved by a method in a base station, for adapting the SRS power control setting in a user equipment.
  • the base station decides an SRS specific fractional pathloss compensation factor " Os 0U ⁇ dm g value based on a specific purpose for using SRS received from the user equipment.
  • the or sou/1d , n9 value is decided independent of a value of a data specific fractional pathloss compensation factor "oc d a t a to be used for data transmission to the base station.
  • the base station then informs the user equipment to use the decided ⁇ ⁇ nd i n g value for adapting the SRS power control setting in the user equipment. This enables the user equipment to send SRS, using power according to the adapted power control setting.
  • the object is achieved by a method in a user equipment, for adapting the SRS power control setting in the user equipment.
  • the user equipment receives from the base station, information to use a decided SRS specific fractional pathloss compensation factor u ⁇ s ⁇ undin g'' value for adapting the SRS power control setting in the user equipment.
  • the a d di n g value has been decided by the base station based on a specific purpose for using SRS received from the user equipment, and is independent of a value of a data specific fractional pathloss compensation factor ⁇ / a value to be used for data transmission to the base station.
  • the user equipment adapts the SRS power control setting according to the a sou n di n g value comprised in the received information.
  • the object is achieved by a method in a wireless communications network, for adapting the SRS power control setting in a user equipment.
  • An SRS specific fractional pathloss compensation factor "o so u n d m g value is decided based on a specific purpose for using SRS received from the user equipment.
  • the a sound , ng value is decided independent of the value of a data specific fractional pathloss compensation factor oaa t a to be used for data transmission to a base station comprised in the wireless communications network.
  • the SRS power control setting is adapted in the user equipment according to the decided ⁇ soun ⁇ m g value, enabling the user equipment to send SRS 1 using power according to the adapted power control setting.
  • the object is achieved by a base station for adapting the Sounding Reference Signal "SRS" power control setting in a user equipment.
  • the base station comprises a deciding unit configured to decide an SRS specific fractional pathloss compensation factor ⁇ soun ⁇ mg value, based on a specific purpose for using SRS received from the user equipment.
  • the ihou n d m g value is decided independent of a value of a data specific fractional pathloss compensation factor ⁇ r a to be used for data transmission to the base station.
  • the base station further comprises an informing unit configured to inform the user equipment to use the decided ⁇ sound , ng value for adapting the SRS power control setting in the user equipment. This enables the user equipment to send SRS, using power according to the adapted power control setting.
  • the object is achieved by a user equipment, for adapting the SRS power control setting in the user equipment.
  • the user equipment comprises a receiving unit configured to receive from the base station, information to use a decided SRS specific fractional pathloss compensation factor " ⁇ so ⁇ ndmg" value, for adapting the SRS power control setting in the user equipment.
  • the ⁇ sounding value has been decided by the base station based on a specific purpose for using SRS received from the user equipment, and is independent of a value of a data specific fractional pathloss compensation factor c ⁇ ara value to be used for data transmission to the base station.
  • the user equipment further comprises an adapting unit configured to adapt the SRS power control setting according to the ⁇ so ⁇ nd ⁇ g value comprised in the received information.
  • the object is achieved by a wireless communications network, for adapting the SRS power control setting in a user equipment.
  • the wireless communications network comprises a deciding unit configured to decide a SRS specific fractional pathloss compensation factor " ⁇ S01/ ⁇ d/ng " value, based on a specific purpose for using SRS received from the user equipment.
  • the ⁇ sounrt ⁇ 9 value is decided independent of the value of a data specific fractional pathloss compensation factor "Odaia" to be used for data transmission to a base station comprised in the wireless communications network.
  • the wireless communications network further comprises an adapting unit configured to adapt the SRS power control setting in the user equipment according to the decided ⁇ soun ⁇ ng value. This enables the user equipment to send SRS, using power according to the adapted power control setting.
  • An advantage with the present solution is that it provides enhanced flexibility in the use of sounding, for example for downlink or uplink.
  • a further advantage with the present solution is that it provides enhanced sounding quality and/or capacity.
  • a yet further advantage with the present solution is that it provides a possibility to adapt sounding for several areas of applications.
  • Figure 1 is a schematic block diagram illustrating embodiments of a wireless communication network.
  • Figure 2 is a combined schematic block diagram and flowchart depicting embodiments of a method.
  • Figure 3 is a schematic block diagram illustrating embodiments of a base station.
  • Figure 4 is a schematic block diagram illustrating embodiments of a user equipment.
  • Figure 5 is a flowchart depicting embodiments of a method in a wireless communications network.
  • Figure 6 is a schematic block diagram illustrating embodiments of a wireless communications network.
  • Figure 7 is a flowchart depicting embodiments of a method in a base station.
  • Figure 8 is a flowchart depicting embodiments of a method in a user equipment.
  • Transmitter power control typically aims at maximizing the received signal power of desired signals, while limiting the generated interference.
  • the amount of interference generated to neighbour cells depends, among other things, on the path gain from the mobile-terminal to these cells. Terminals close to neighbour cells generate more interference than terminals far away. For a given interference level in a neighbour cell, terminals far away may hence transmit with a higher power than terminals near the cell. This may be accomplished by power control mechanisms including a fractional pathloss compensation factor ⁇ .
  • the terminal transmission power P, in dB is set according to
  • ⁇ ⁇ + a - PL
  • X is a parameter used to control the target received power
  • ⁇ the fractional pathloss compensation factor
  • PL the estimated pathloss.
  • ⁇ can be used to control the tradeoff between cell-edge quality and cell capacity.
  • Different physical transmissions, e.g. data, control and sounding may be power controlled depending on which physical channel the transmissions are made or depending on the type of transmission on a certain physical channel. In the case of data and sounding channels this looks like
  • the setting for SRS in the power control for 3GPP LTE is specified as follows:
  • CMAX is the configured UE transmitted power.
  • K s 125
  • PSRS _ OFFS E T j s a 4_ bit UE specific parameter semi-statically configured by higher layers with 1dB step size in the range [-3, 12] dB.
  • SR5 OFFSCT is a 4 " bit UE specific parameter semi-statically configured by higher layers with 1.5 dB step size in the range [-10.5,12] dB.
  • MsRS is the bandwidth of the SRS transmission in subframe i expressed in number of resource blocks.
  • ⁇ ⁇ is the current power control adjustment state for the PUSCH.
  • the setting for the PUSCH in the power control for 3GPP LTE is specified as follows:
  • CMAX is the configured UE transmitted power
  • ⁇ PUSCH CO j s the bandwidth of the PUSCH resource assignment expressed in number of resource blocks valid for subframe /.
  • a e ⁇ o, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, l ⁇ is a 3-bit cell specific parameter provided by higher layers.
  • a(j) 1.
  • the ⁇ term becomes ⁇ (l) and for PUSCH ⁇ is also ⁇ (l) except for (re)transmissions corresponding to a random access response grant, hence the ⁇ factor is the same and changing a changes a both for SRS.
  • the number of users using a certain frequency in each cell may be one and the power control parameters may be chosen to increase cell throughput and user throughput for users in the cell centre or close to the base station at the expense of cell edge data rates.
  • SRS transmissions used for downlink transmission in for example TDD
  • the sounding is used for beam forming with multiple antennas, the benefit of such techniques may be the greatest at the cell edge, but this then requires that accurate channel estimates can be obtained also from cell edge users.
  • FIG. 1 depicts a wireless communications network 100.
  • the wireless communications network 100 may use technologies such as LTE or the IEEE 802.16 family of standards, notably "Mobile WiMAX".
  • the wireless communications network 100 comprises a base station 110 serving a cell 115.
  • the base station 110 may be a base station such as a NodeB, an eNodeB, or any other network unit capable of communicating over a radio carrier with a user equipment being present in the within its reach.
  • a user equipment 120 is present within the first cell 115 and served by the first network node 110, and is in this case capable of communicating with the first network node 110 over a radio carrier.
  • the user equipment 120 may be a mobile phone, a Personal Digital Assistant (PDA), or any other radio communications network unit capable to communicate with a base station over a radio channel.
  • the user equipment 120 is referred to as UE in some of the figures.
  • the user equipment 120 transmits Sounding Reference Signals SRS 125 or sounding reference symbols.
  • SRS also may be interpreted as sounding reference symbols, to e.g. be used by the base station 110 for e.g. estimating the uplink channels.
  • the channel estimates may be used for uplink RRM such as scheduling, link adaptation and power control, but also for downlink multiple antenna transmission and RRM, especially in case of Time Division Duplex (TDD) where the uplink and downlink use the same frequencies.
  • SRS may also be used to derive timing-control commands for uplink time alignment.
  • the SRS transmissions from the user equipment 120 are power controlled.
  • the present solution provides a SRS specific fractional pathloss compensation factor, a soundi ⁇ g that is independent of the value of a ⁇ ate and that is decided based on what the SRS is used for.
  • the user equipment 120 behaviour when transmitting SRS may then be configured by the network, signalling to the user equipment 120 using higher layer RRC signalling.
  • the SRS power control is adapted to what the SRS is used for, such as best information for an application, which e.g. may be for uplink RRM or for downlink RRM including beam forming.
  • the SRS power control is further adapted to optimum, i.e. best possible, received SRS quality as mentioned above by providing the SRS specific fractional pathloss compensation factor, Osoun ⁇ ns-
  • Some embodiments provides the possibility of having different SRS power control settings in different types uplink subframes and transmission slots such a Uplink Part of Time Slot (UpPTS), as well as different settings over time in the same type of slot so that sounding resources for both uplink RRM and downlink RRM can be appropriately configured.
  • UpPTS Uplink Part of Time Slot
  • Some embodiments provide reducing the signalling for configuring the SRS.
  • the pathloss compensation is set to 1 for sending SRS in UpPTS which is then intended for downlink RRM including beam forming whereas the pathloss compensation in other ordinary uplink subframes is the same as for PUSCH since such sounding is then intended for uplink RRM.
  • the present solution method for adapting the SRS power control setting in a user equipment 120 will no be described with reference to the combined signalling diagram and flowchart depicted in Figure 2 and with reference to Figure 3 depicting the base station 110 and Figure 4 depicting the user equipment 120.
  • the method comprises the following steps, which steps may as well be carried out in another suitable order than described below:
  • Step 201 The base station 110 decides the SRS specific fractional pathloss compensation factor "dsoun d mg value, based on a specific purpose for using SRS received from the user equipment 120.
  • the a S0U n d mg value is decided independent of a value of a data specific fractional pathloss compensation factor " ⁇ W to be used for data transmission to the base station 110. This step may be performed in a deciding unit 310 within the base station 110 as depicted in Figure 3.
  • the base station informs the user equipment 120 to use the decided a sou ⁇ dmg value for adapting the SRS power control setting in the user equipment (120).
  • the information may be sent to the user equipment e.g. by signalling the information to the user equipment 120, or may be implicit (hardcoded), fixed value in the standard.
  • a sound ⁇ ng 1 such that it is never signalled but hardcoded in the user equipment 120.
  • This step may be performed in an informing unit 320 within the base station 110 as depicted in Figure 3.
  • the user equipment 120 receives the information from the base station 110.
  • the information may be received by a receiving unit 410 within the user equipment 120 as depicted in Figure 4.
  • a sound ⁇ ng may be a constant 1 , eliminating the need for sending it.
  • a soan ⁇ mg is not necessarily sent explicitly to the user equipment 120 with order to use it. Instead some other parameter may be signalled, such as e.g. the transmission mode used for downlink data transmission, which triggers the user equipment 120 to use the a ⁇ un ⁇ ng that it received in a previous time instance.
  • the user equipment 120 adapts the SRS power control setting according to the ccsoun ⁇ ing value comprised in the received information. This step may be performed by an adapting unit 420 within the user equipment 120 as depicted in Figure 4.
  • the user equipment 120 sends SRS using a power according to the adapted SRS power control setting.
  • This step may be performed by a sending unit 430 within the user equipment 120 as depicted in Figure 4.
  • the present solution method for adapting the SRS power control setting in a user equipment 120 will no be described with reference to the flowchart depicted in Figure 5 and with reference to Figure 6 depicting the wireless communications network 100.
  • This embodiment relates to the case wherein a node within the radio communications network 100, or the base station 110, decides the a ⁇ und i ng value, and the user equipment 120 is configured e.g. at factory and not receives the alpha from the base station 110.
  • the method comprises the following steps, which steps may as well be carried out in another suitable order than described below:
  • the wireless communications network 100 decides the SRS specific fractional pathloss compensation factor "ocsou n d m g" value, based on a specific purpose for using SRS received from the user equipment 120 in the base station 110.
  • the a ⁇ undi ⁇ g value is decided independent of the value of a data specific fractional pathloss compensation factor "ocdata" to be used for data transmission to a base station 110 comprised in the wireless communications network 100. This step may be performed in a deciding unit 610 within the wireless communications network 100 depicted in Figure 6.
  • Step 502 The user equipment 120 adapts the SRS power control setting in the user equipment 120 according to the decided ⁇ sounding value.
  • This step may be performed by an adapting unit 620 within the user equipment 120 depicted in Figure 6. It may be performed such that the user equipment 120 output power when transmitting SRS is set according to the ⁇ sou ⁇ di n g value.
  • the ⁇ so u n d m g value is hardcoded in the user equipment.
  • the user equipment 120 may then send SRS, using a power according to the adapted SRS power control setting. This step may be performed by a sending unit 630 within the user equipment 120 depicted in Figure 6.
  • Osounomg ⁇ or ⁇ SO undmg - ccdata should be used for all sounding either by means of user equipment specific higher layer signalling or being broadcasted as part of system information to all users in a cell.
  • the wireless communications network 100 performing the method steps above for adapting the SRS power control setting in the user equipment 120, will now be further described with reference to Figure 6.
  • the wireless communications network 100 comprises the deciding unit 610 configured to decide a SRS specific fractional pathloss compensation factor "oso un cW" value, based on a specific purpose for using SRS received from the user equipment 120.
  • the ⁇ soundmg value is decided independent of the value of a data specific fractional pathloss compensation factor " ⁇ t ⁇ a" to be used for data transmission to a base station
  • the deciding unit 610 is configured to decide that the CCS R S value is to be alternated between different values in different instants of time.
  • RRM Radio Resource Management
  • the specific purpose for using the SRS from the user equipment 120 may be for uplink RRM.
  • the deciding unit 610 further is configured to decide that the ⁇ so u n d mg value ⁇ 1.
  • the deciding unit 610 may be configured to decide the ⁇ sou n d m g value specifically for the user equipment 120. This enables the base station 110 to receive SRS from the user equipment 120 on a power level that differs from the power level of SRS received from other user equipments.
  • the GPP LTE TDD technology is used.
  • the deciding unit 610 may be configured to decide that the ⁇ soundmg value is one specific ⁇ soun d m g value in a Uplink Part of Time Slot "UpPTS" field of the special subframe in 3GPP LTE TDD, which special subframe comprises the switch point between downlink and uplink transmission.
  • the wireless communications network 100 comprises the user equipment 120.
  • the user equipment 120 comprises the adapting unit 620 configured to adapt the SRS power control setting in the user equipment 120 according to the decided ⁇ soundm g value. This enables the user equipment 120 to send SRS, using power according to the adapted power control setting.
  • the method steps performed in the base station 110 for adapting the SRS power control setting in a user equipment 120 will now be described with reference to a flowchart depicted in Figure 7.
  • the method comprises the following steps, which steps may as well be carried out in another suitable order than described below:
  • the base station 110 decides an SRS specific fractional pathloss compensation factor "ccso ⁇ n d m g " value.
  • the decision is based on a specific purpose for using SRS received from the user equipment 120.
  • the a sou ⁇ dirg value is decided independent of a value of a data specific fractional pathloss compensation factor "oc d a t a" to be used for data transmission to the base station 110.
  • this step of deciding comprises deciding that the a sound , ⁇ g value is to be alternated between different values in different instants of time.
  • this step of deciding comprises deciding the a sou nd i n g value is to be different in different types of transmission slots.
  • This step of deciding may in some embodiments comprise to decide that the ⁇ sounding value ⁇ 1.
  • this step of deciding may comprise that the ⁇ sou n di n g value is decided specifically for the user equipment 120. This enables the base station 110 to receive SRS from the user equipment 120 on a power level that differs from power level of SRS received from other user equipments.
  • this step of deciding comprises, deciding that the ⁇ SOu ⁇ d i ⁇ g value is one specific ⁇ sounding value in a Uplink Part of Time Slot "UpPTS" field of the special subframe in 3GPP LTE TDD.
  • the special subframe comprises the switch point between downlink and uplink transmission.
  • Step 702 The base station 110 informs the user equipment 120 to use the decided a sou ⁇ d ⁇ ng value for adapting the SRS power control setting in the user equipment 120. This enables the user equipment 120 to send SRS, using power according to the adapted power control setting.
  • this step is performed by signalling, using user equipment specific higher layer signalling or by broadcasting.
  • the base station 110 performing the method steps above for adapting the SRS power control setting in the user equipment 120, will now be further described with reference to Figure 3.
  • the base station 110 comprises the deciding unit 310 configured to decide an
  • SRS specific fractional pathloss compensation factor "a soundmg" value based on a specific purpose for using SRS received from the user equipment 120.
  • the ⁇ wi dm g value is decided independent of a value of a data specific fractional pathloss compensation factor "Odata" to be used for data transmission to the base station 110.
  • the deciding unit 310 is configured to decide that the ⁇ soun ⁇ ⁇ m g value is to be alternated between different values in different instants of time.
  • RRM Radio Resource Management
  • the deciding unit 310 may be configured to decide that the a ⁇ u ⁇ mg value is one specific a ⁇ m ⁇ mg value in a Uplink Part of Time Slot "UpPTS" field of the special subframe in 3GPP LTE TDD.
  • the special subframe comprises the switch point between downlink and uplink transmission.
  • the base station 110 further comprises the informing unit 320 configured to inform 202 the user equipment 120 to use the decided ⁇ soundmg value for adapting the SRS power control setting in the user equipment 120. This enables the user equipment 120 to send SRS, using power according to the adapted power control setting.
  • the informing unit 320 is configured to inform the user equipment 120 by signalling, using user equipment specific higher layer signalling or by broadcasting.
  • the method steps in the user equipment 120 for adapting the SRS power control setting in the user equipment 120 will now be described with reference to a flowchart depicted in Figure 8.
  • the method comprises the following steps, which steps may as well be carried out in another suitable order than described below:
  • the user equipment 120 receives from the base station 110, information to use a decided SRS specific fractional pathloss compensation factor u ⁇ SOund ⁇ ng " value, for adapting the SRS power control setting in the user equipment 120.
  • the ⁇ soun ⁇ mg value has been decided by the base station 110 based on a specific purpose for using SRS received from the user equipment 120 and is independent of a value of a data specific fractional pathloss compensation factor ct ⁇ a/a value to be used for data transmission to the base station 110.
  • the ⁇ sound ⁇ g value comprised in the received information is to be alternated between different values in different instants of time. In some embodiments the a sounding value comprised in the received information is different in different types of transmission slots.
  • the ⁇ so Un ⁇ g value comprised in the received information 1.
  • the a sounfJmg value comprised in the received information O 0313 .
  • the a S0U ndmg value comprised in the received information may be a specific a soun ⁇ m g value to be used when sending SRS in an Uplink Part of Time Slot "UpPTS" field of the special subframe.
  • the special subframe comprises the switch point between downlink and uplink transmission.
  • This step of receiving the information from the base station 110 may be received via user equipment specific higher layer signalling or via broadcasting.
  • the user equipment 120 adapts the SRS power control setting according to the a soundmg value comprised in the received information.
  • Step 803 The user equipment 120 sends SRS using a power according to the adapted SRS power control setting.
  • the user equipment 120 performing the method steps above for adapting the SRS power control setting in the user equipment 120, will now be further described with reference to Figure 4.
  • the user equipment 120 comprises the receiving unit 410 configured to receive from the base station 110, information to use a decided SRS specific fractional pathloss compensation factor " ⁇ so Urt r f , ng n value, for adapting the SRS power control setting in the user equipment 120.
  • the a S0Und mg value has been decided by the base station 110 based on a specific purpose for using SRS received from the user equipment 120 and is independent of a value of a data specific fractional pathloss compensation factor a ⁇ t a , a value to be used for data transmission to the base station 110.
  • the ⁇ so ⁇ n d m g value comprised in the received information may be adapted to be alternated between different values in different instants of time.
  • the ⁇ SOundmg value comprised in the received information may be adapted to be different in different types of transmission slots.
  • the ccsou n d m g value comprised in the received information may be a specific ⁇ sou ⁇ dmg value to be used when sending SRS in an Uplink Part of Time Slot "UpPTS" field of the special subframe, which special subframe comprises the switch point between downlink and uplink transmission.
  • the receiving unit 410 further is configured to receive the information from the base station 110 via user equipment specific higher layer signalling or via broadcasting.
  • the user equipment 120 further comprises the adapting unit 420 configured to adapt the SRS power control setting according to the ⁇ soundmg value comprised in the received information.
  • the user equipment 120 further comprises the sending unit 430 configured to send
  • the present mechanism for adapting the Sounding Reference Signal "SRS" power control setting in the user equipment 120 may be implemented through one or more processors, such as a processor 330 in the base station depicted in Figure 3, a processor 440 in the user equipment depicted in Figure 4, a processor 640 in the wireless communications network 100 and a processor 650 in the user equipment 120 within the wireless communications network 100 depicted in Figure 6, together with computer program code for performing the functions of the present solution.
  • the program code mentioned above may also be provided as a computer program product, for instance in the form of a data carrier carrying computer program code for performing the present solution when being loaded into the wireless communications network 100, and the user equipment 120.
  • One such carrier may be in the form of a CD ROM disc. It is however feasible with other data carriers such as a memory stick.
  • the computer program code can furthermore be provided as pure program code on a server and downloaded to the base station 110, the wireless communications network 100 and the user equipment 120 remotely.

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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 dans une station de base, permettant d'adapter le réglage de la commande de puissance de signaux de sondage de référence (SRS) dans un équipement utilisateur. Une valeur de facteur de compensation fractionnaire d'affaiblissement de propagation spécifique des signaux SRS "αsounding" est déterminée en fonction d'un objectif spécifique pour des signaux SRS reçus depuis l'équipement utilisateur. La valeur αsounding est determinée indépendamment d'une valeur d'un facteur de compensation fractionnaire d'affaiblissement de propagation spécifique de données "αdata" destiné à être utilisé pour la transmission de données vers la station de base. L'équipement utilisateur est informé qu'il doit utiliser la valeur αsounding pour adapter le réglage de commande de puissance des signaux SRS dans l'équipement utilisateur. Cela permet la transmission de signaux SRS par l'équipement utilisateur avec une puissance selon le réglage de commande de puissance adapté.
PCT/SE2009/051038 2009-06-26 2009-09-17 Procede et agencement dans un reseau de communications sans fil pour l'adaptation de reglage de commande de puissance Ceased WO2010151196A1 (fr)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102291812A (zh) * 2011-09-13 2011-12-21 电信科学技术研究院 上行功控参数配置及上行功控方法、系统和设备
WO2014185841A1 (fr) * 2013-05-16 2014-11-20 Telefonaktiebolaget L M Ericsson (Publ) Equipement utilisateur et procede pour emettre des signaux de reference de sondage
CN104349438A (zh) * 2013-07-24 2015-02-11 上海贝尔股份有限公司 确定上行传输功率的方法
CN105723781A (zh) * 2014-01-24 2016-06-29 Lg电子株式会社 在tdd型无线通信系统中在特殊子帧上控制探测参考信号的发射功率的方法及其设备
CN108365930A (zh) * 2017-01-26 2018-08-03 华为技术有限公司 上行测量参考信号的功率控制方法、网络设备及终端设备
US20180368081A1 (en) * 2017-06-16 2018-12-20 Qualcomm Incorporated Techniques and apparatuses for power headroom reporting in new radio
CN110557237A (zh) * 2015-11-25 2019-12-10 上海朗帛通信技术有限公司 一种降低网络延迟的无线通信方法和装置
CN116158153A (zh) * 2020-07-17 2023-05-23 株式会社Ntt都科摩 终端、无线通信方法以及基站
TWI807757B (zh) * 2021-04-06 2023-07-01 聯發科技股份有限公司 用於探測參考訊號之部分探測方法及其使用者設備

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005048491A1 (fr) * 2003-11-14 2005-05-26 Samsung Electronics Co., Ltd. Procede procurant une amplification de pilote dans e-dch de wcdma
US20080051126A1 (en) * 2006-08-22 2008-02-28 Shirish Nagaraj Method for allocating transmit power in a wireless communication system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005048491A1 (fr) * 2003-11-14 2005-05-26 Samsung Electronics Co., Ltd. Procede procurant une amplification de pilote dans e-dch de wcdma
US20080051126A1 (en) * 2006-08-22 2008-02-28 Shirish Nagaraj Method for allocating transmit power in a wireless communication system

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102291812B (zh) * 2011-09-13 2014-12-03 电信科学技术研究院 上行功控参数配置及上行功控方法、系统和设备
CN102291812A (zh) * 2011-09-13 2011-12-21 电信科学技术研究院 上行功控参数配置及上行功控方法、系统和设备
WO2014185841A1 (fr) * 2013-05-16 2014-11-20 Telefonaktiebolaget L M Ericsson (Publ) Equipement utilisateur et procede pour emettre des signaux de reference de sondage
US9900867B2 (en) 2013-05-16 2018-02-20 Telefonaktiebolaget Lm Ericsson (Publ) User equipment and a method for transmitting sounding reference signals
CN104349438A (zh) * 2013-07-24 2015-02-11 上海贝尔股份有限公司 确定上行传输功率的方法
CN104349438B (zh) * 2013-07-24 2018-11-02 上海诺基亚贝尔股份有限公司 确定上行传输功率的方法
CN105723781A (zh) * 2014-01-24 2016-06-29 Lg电子株式会社 在tdd型无线通信系统中在特殊子帧上控制探测参考信号的发射功率的方法及其设备
EP3099119A4 (fr) * 2014-01-24 2017-06-28 LG Electronics Inc. Procédé de réglage de puissance de transmission d'un signal de sondage de référence sur une sous-trame spécial dans un système de communications sans fil de type tdd et dispositif associé.
CN110557237A (zh) * 2015-11-25 2019-12-10 上海朗帛通信技术有限公司 一种降低网络延迟的无线通信方法和装置
CN108365930A (zh) * 2017-01-26 2018-08-03 华为技术有限公司 上行测量参考信号的功率控制方法、网络设备及终端设备
US11012948B2 (en) 2017-01-26 2021-05-18 Huawei Teclinologies Co., Ltd. Uplink measurement reference signal power control method, network device, and terminal device
EP3557808A4 (fr) * 2017-01-26 2019-12-18 Huawei Technologies Co., Ltd. Procédé de commande de puissance pour signal de référence de mesure de liaison montante, dispositif réseau et dispositif terminal
WO2018232127A1 (fr) * 2017-06-16 2018-12-20 Qualcomm Incorporated Procédé et appareil pour la commande de puissance de signaux de référence sonores
US10462755B2 (en) 2017-06-16 2019-10-29 Qualcomm Incorporated Techniques and apparatuses for power headroom reporting in new radio
CN110731105A (zh) * 2017-06-16 2020-01-24 高通股份有限公司 用于探通参考信号的功率控制的方法和装置
KR20200015560A (ko) * 2017-06-16 2020-02-12 퀄컴 인코포레이티드 사운딩 기준 신호들의 전력 제어를 위한 방법 및 장치
US20180368081A1 (en) * 2017-06-16 2018-12-20 Qualcomm Incorporated Techniques and apparatuses for power headroom reporting in new radio
TWI766042B (zh) * 2017-06-16 2022-06-01 美商高通公司 用於新無線電中的功率餘量報告的技術和裝置
KR102684296B1 (ko) 2017-06-16 2024-07-10 퀄컴 인코포레이티드 사운딩 기준 신호들의 전력 제어를 위한 방법 및 장치
CN116158153A (zh) * 2020-07-17 2023-05-23 株式会社Ntt都科摩 终端、无线通信方法以及基站
TWI807757B (zh) * 2021-04-06 2023-07-01 聯發科技股份有限公司 用於探測參考訊號之部分探測方法及其使用者設備

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