WO2013166695A1 - 上行探测参考信号的发送功率控制方法及其装置 - Google Patents

上行探测参考信号的发送功率控制方法及其装置 Download PDF

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Publication number
WO2013166695A1
WO2013166695A1 PCT/CN2012/075326 CN2012075326W WO2013166695A1 WO 2013166695 A1 WO2013166695 A1 WO 2013166695A1 CN 2012075326 W CN2012075326 W CN 2012075326W WO 2013166695 A1 WO2013166695 A1 WO 2013166695A1
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WIPO (PCT)
Prior art keywords
user equipment
power control
comp
point
difference
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PCT/CN2012/075326
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English (en)
French (fr)
Inventor
徐月巧
王轶
周华
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富士通株式会社
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Priority to PCT/CN2012/075326 priority Critical patent/WO2013166695A1/zh
Priority to CN201280072704.9A priority patent/CN104255073B/zh
Publication of WO2013166695A1 publication Critical patent/WO2013166695A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • 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
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff

Definitions

  • the present invention relates to the field of communications, and in particular, to a transmit power control method and apparatus for an uplink sounding reference signal (SRS) in a CoMP scenario.
  • SRS uplink sounding reference signal
  • the downlink transmission point and the uplink reception point of the user equipment (IE) of a cell are the same, and are all the same base station (Base Station, BS). Therefore, the UE only The uplink SRS needs to be sent to the downlink transmission point.
  • the power control value for transmitting the SRS may share an open-loop part and a closed-loop part of a physical uplink shared channel (PUSCH) power control value, and send the SRS with respect to the PUSCH.
  • the power control value is increased by a power offset value.
  • LTE-Advanced (LTE-A) systems Coordinated Multi-point (CoMP) transmission/reception is included as one of the key technologies in the LTE-A framework.
  • the cooperative transmission scenario uses the geographically adjacent transmission points to cooperatively transmit signals to the user or multi-point cooperatively to receive uplink signals from the user. For the cell edge users, the signal quality can be improved and the coverage can be expanded.
  • the following four scenarios are defined for Up/Down CoMP (UL/DL CoMP):
  • CoMP scenario 1 Site of a homogeneous network CoMP (Homogenous Network with Intra-site CoMP);
  • CoMP scenario 2 (Scenario 2): a homogeneous network with a high transmit power Radio Remote Head (RRH);
  • RRH Radio Remote Head
  • CoMP scenario 3 (Scenario 3): A heterogeneous network scenario with different cell IDs for low-power RRHs distributed by macro cell ranges;
  • CoMP Scenario 4 (Scenario 4): The macro cell range distributes heterogeneous network scenarios with the same cell ID for low-power RRHs.
  • the CoMP scenario 3 and the scenario 4 belong to a heterogeneous network scenario.
  • the macro eNB and the pico eNB (or the remote radio RRH) have different transmission powers, such as 10 MHz.
  • the downlink eNB's downlink transmit power is 46dBm
  • the pico eNB's transmit power It is 30dBm. Therefore, according to the existing reference signal received power (RSRP), the downlink transmission point of a certain UE is determined, and according to the distance from the UE to each service point, the uplink reception point of a certain UE is determined, and the downlink transmission point exists.
  • the case where the macro eNB and the uplink receiving point are pico eNBs. Therefore, there is a case where the uplink and downlink coverage are asymmetric, that is, the uplink coverage of the pico eNB is larger than the downlink coverage.
  • the downlink CoMP transmission point and the uplink CoMP reception point are different.
  • the transmit power of the SRS is mainly based on the power that the macro eNB can correctly receive, or the power that the RRH1 can correctly receive, so that There is a problem in transmitting power control of the Sounding Reference Signal (SRS).
  • SRS Sounding Reference Signal
  • the CoMP UE always transmits the SRS with a higher transmission power, which reduces the battery life of the user and causes greater interference to users serving in the RRH1; If the SRS transmission is adjusted according to the target of correctly receiving the SRS by RRH1, the CoMP UE always transmits the SRS with a lower transmission power, and the macro eNB may not receive the SRS correctly.
  • An embodiment of the present invention provides a method and a device for controlling a transmission power of an uplink sounding reference signal, and introducing an independent closed loop power control to an SRS power control of a downlink transmission point, and transmitting a closed loop power of the SRS to the downlink transmission point.
  • the control value is adjusted, and the power control value of the uplink SRS is sent to the downlink transmission point according to the adjusted closed-loop power control value, thereby solving the SRS power control problem currently existing in the heterogeneous network.
  • An aspect of the present invention provides a method for controlling a transmission power of an uplink sounding reference signal, which is used in a multi-point cooperation (CoMP) system.
  • the method includes :
  • the closed loop power control value, the power offset value, and the open loop power control value are used to determine a power control value for the current subframe to transmit the sounding reference signal to the downlink transmission point.
  • a method for controlling a transmission power of an uplink sounding reference signal is provided, which is used in a multi-point cooperation (CoMP) system.
  • CoMP multi-point cooperation
  • the serving cell to which the CoMP user equipment belongs sends the difference between the downlink transmission point and the path loss of the uplink receiving point to the CoMP user equipment to the CoMP user equipment, where the path loss difference is used by the user equipment to determine the user-specific closed loop power. Control the initial value; or,
  • the serving cell to which the CoMP user equipment belongs sends relevant information for determining the difference of the path loss to the CoMP user equipment, where the related information is used by the user equipment to determine the difference of the path loss, and determining the user-specific according to the difference of the path loss.
  • the initial value of the closed loop power control, the related information includes: a difference between a transmit power value of the downlink transmit point and the uplink receive point to transmit a pilot signal, or a difference between a transmit power value of the downlink transmit point and the uplink receive point to send a pilot signal, and the difference The difference between the received power of the downlink transmission point and the uplink receiving point and the received power of the CoMP user equipment.
  • a user equipment includes: an adjustment unit configured to use a user-specific closed loop power control initial value to transmit a sounding reference to the downlink transmission point The closed-loop power control value of the signal is adjusted; wherein, the initial value of the closed-loop power control dedicated to the user is determined according to the obtained difference between the downlink transmission point and the path loss of the uplink receiving point to the CoMP user equipment;
  • a first processing unit configured to determine, by using the closed loop power control value, the power offset value, and the open loop power control value, a power control value that the current subframe sends the sounding reference signal to the downlink transmission point.
  • a base station is provided, where the base station includes:
  • a first sending unit configured to send, to the CoMP user equipment, a difference between a path loss of the downlink sending point and the uplink receiving point to the CoMP user equipment, where the path loss is used for the user equipment Determine the user-specific closed loop power control initial value.
  • a base station is provided, where the base station includes:
  • a second sending unit configured to send, to the CoMP user equipment, related information that determines a difference of the path loss, where the related information is used by the user equipment to determine a difference of the path loss, and according to the path
  • the difference in path loss determines the initial value of the closed loop power control dedicated to the user
  • the related information includes: a difference between a transmit power value of the downlink transmit point and the uplink receive point to send a pilot signal, or a difference between a transmit power value of the downlink transmit point and the uplink receive point to send a pilot signal, and the downlink send point and The difference between the received power of the pilot signal sent by the uplink receiving point and the CoMP user equipment.
  • a computer readable program wherein when the program is executed in a user equipment, the program causes the computer to perform a transmission power of the uplink sounding reference signal as described above in the user equipment Control Method.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a transmission power control method of an uplink sounding reference signal as described above in a user equipment .
  • a computer readable program wherein when the program is executed in a base station, the program causes a computer to perform transmission of an uplink sounding reference signal as described above in the base station Power control method.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a transmission power control method of an uplink sounding reference signal as described above in a base station.
  • the beneficial effects of the embodiments of the present invention are: introducing an independent closed-loop power control by the SRS power control of the downlink transmission point, that is, the user-specific closed-loop power control initial value adjusts the closed-loop power control value of the SRS sent to the downlink transmission point, And determining, according to the adjusted closed-loop power control value, a power control value for transmitting the uplink SRS to the downlink transmission point, thereby solving the current SRS power control problem existing in the heterogeneous network.
  • Figure 1 is a schematic diagram of a CoMP scenario 3/4
  • FIG. 2 is a flowchart of a method for controlling transmission power of an uplink sounding reference signal according to Embodiment 1 of the present invention
  • FIG. 3 is a flowchart of a method for controlling transmission power of an uplink sounding reference signal according to Embodiment 3 of the present invention
  • FIG. 5 is a schematic structural diagram of a user equipment according to Embodiment 5 of the present invention.
  • FIG. 6 is a schematic structural diagram of a user equipment according to Embodiment 6 of the present invention.
  • Figure 7 is a block diagram showing the structure of a base station according to Embodiment 7 of the present invention.
  • FIG. 8 is a block diagram showing the configuration of a base station according to Embodiment 8 of the present invention. detailed description
  • the cell in which the UE is located has only one base station coverage, and both the uplink receiving point and the downlink sending point are the base station.
  • the power of transmitting SRS is determined according to formula (1).
  • ⁇ ⁇ is the transmission power of the uplink SRS sent by the user equipment to the serving cell c on the subframe, and its value is: peMAX .
  • the power control value is:
  • Pcmax , . ('') is the maximum configured to send the user equipment to the serving cell c on the subframe. Transmitting power
  • PsRS - OTFSET , e (Wi ) is a 4-bit parameter of the upper half semi-static configuration, indicating the power offset value of the transmission power of the SRS transmitted by the UE compared to the transmission power of the PUSCH transmitted by the UE.
  • RRC radio resource control
  • M sRS , c represents the bandwidth that the SRS sends to the serving cell c in the subframe, and is a resource block (Resource Block,
  • /c W represents the power control adjustment value
  • PUSeH consists of two parts: One part is the cell-specific parameter P provided by the upper layer. — N . MINAL PUSeH , the other part is the user-specific parameter P.
  • ⁇ PUSeH that is to say, ⁇ ⁇ is all in the community
  • the nominal power of the UE is semi-statically set, that is, the cell-specific nominal power, and each UE also has a UE-specific nominal power offset, that is, ⁇ . ⁇ PUSeH , the nominal power used by the UE is the sum of the two parts, P. ⁇ puseH .
  • the nominal power in the SRS power control can use the same value as in the PUSCH power control.
  • the upper layer informs the UE that the path loss compensation factor in the SRS power control can use the same value as in the PUSCH power control. Indicates the path loss value estimated by the UE based on the downlink reference signal, and the value used in the current PUSCH power control is used in the SRS power control.
  • the SRS may share the same open-loop part and closed-loop part in the PUSCH power control, that is, use the parameters Po pusa ⁇ , a c ), ⁇ ⁇ and 0' in the PUSCH power control. From equation (1), SRS power control adds an offset value relative to PUSCH power control.
  • FIG. 1 is a schematic diagram of a CoMP scenario 3/4.
  • the downlink of the CoMP UE is sent by the macro eNB, and since the CoMP UE is closer to RRH1, the uplink is received by the RRH1.
  • the transmission point of the DL CoMP is different from the reception point of the UL CoMP.
  • the SRS power control flow mechanism of the Rel_10 is no longer applicable.
  • the SRS is used not only to estimate the Channel State Information (CSI) but also to estimate the DL channel state information by utilizing the reciprocity of the uplink and downlink channels. That is, not only the receiving point of the UL CoMP needs to receive the SRS sent by the CoMP UE, but also the sending point of the DL CoMP needs to receive the SRS sent by the CoMP UE, so that the sending point of the DL CoMP can estimate the sending point of the DL CoMP to the CoMP.
  • CSI between UEs.
  • the SRS power control flow mechanism in Rel-10 is no longer applicable. the reason is:
  • both the Open Loop Power Control (OLPC) part and the Closed Loop Power Control (CLPC) part are bound to the PUSCH power control (PC). , that is, reuse the parameters of the open loop and closed loop of the PUSCH.
  • PC PUSCH power control
  • the dynamic change of the uplink path loss is compensated by the closed loop power control of the PUSCH, that is, by the closed loop power control adjustment value in the formula (1).
  • the SRS power control cannot be adjusted on the network to adapt to the change of the channel dynamics.
  • the existing SRS power control cannot dynamically adjust the transmit power of the SRS to adapt the CoMP UE to the DL.
  • the link of the CoMP transmission point is independent of the channel change of the link to the UL CoMP.
  • the power sent to the Macro eNB is higher than the power sent to the RRH1. If the Rel-10-SRS power control mechanism is maintained, the SRS transmit power is correctly received by the Nacro eNB. Power is dominant, either based on the power that RRH1 can correctly receive, both of which cause problems, as described in the background. Therefore, in the CoMP scenario of Rel-11, it is necessary to solve the SRS power control. The problem is that both the CSI estimation of the UL CoMP and the CSI estimation of the DL CoMP are facilitated.
  • the SRS power offset value of W ⁇ 2 is introduced with respect to the Rel-10 SRS power control, so that different SRS power offsets can be used for A-SRS transmission to DL CoMP and transmission to UL CoMP. value.
  • the SRS sent to the DL CoMP transmission point and sent to the UL CoMP receiving point is a different type of SRS.
  • the A-SRS is sent to the DL CoMP transmission point
  • the P_SRS is sent to the UL CoMP receiving point. Values are fine.
  • the SRS transmitted to the DL CoMP is an A-SRS
  • the SRS transmitted to the UL CoMP may be either an A-SRS or a P_SRS. Then three power offset values are needed at this time.
  • this method does not distinguish between DL CoMP, UL CoMP and dynamic, independent channel changes between the user links.
  • the embodiments of the present invention are mainly directed to introducing additional closed loop power control in the SRS power control to solve the above problem.
  • the transmission power control method and device for the uplink SRS in the CoMP scenario according to the embodiment of the present invention are described below by using an embodiment.
  • FIG. 2 is a flowchart of a method for controlling transmission power of an uplink sounding reference signal according to Embodiment 1 of the present invention.
  • the method is used in a multi-point cooperation (CoMP) system.
  • CoMP multi-point cooperation
  • the method includes:
  • Step 201 Adjust a closed-loop power control value of a sounding reference signal (SRS) sent to the downlink transmission point by using a user-specific (UE-Specifi c) closed-loop power control initial value; wherein, the user-specific closed-loop power control initial The value is determined according to the obtained difference between the downlink transmission point and the path loss of the uplink receiving point to the CoMP user equipment;
  • Step 202 Determine, by using the closed loop power control value, the power offset value, and the open loop power control value, a power control value that the current subframe sends the sounding reference signal to the downlink sending point.
  • the downlink transmission point is a DL CoMP transmission point, which may be a macro base station or a micro base station or an RRH;
  • the uplink receiving point is a UL CoMP receiving point, and may be a macro base station or a micro base station or an RRH.
  • the DL CoMP When the DL CoMP transmission point is different from the UL CoMP receiving point, the DL CoMP sends a link loss between the link between the CoMP UE and the link between the CoMP UE and the link between the UL CoMP receiving point and the CoMP UE. Independent of each other, and there is a difference in path loss. If the PUSCH power control mechanism works well, the SRS power sent to the UL CoMP receiving point can well compensate the path loss PL of the link between the UL CoMP receiving point and the CoMP UE.
  • the difference between the path loss between the PL of the CoMP UE and the PL of the CoMP UE and the PL of the CoMP UE depends on the user-specific Closed loop power control implementation.
  • the path loss difference between the DL CoMP transmission point and the UL CoMP receiving point to the CoMP UE is compensated by the initial value of the closed loop power control.
  • step 201 the closed loop power control initial value is determined using the DL CoMP transmission point and the UL CoMP reception point to the CoMP UE.
  • the closed loop power control initial value is represented by / ⁇ (0)
  • / £ (0) represents the closed-loop power control initial value in the power control value of the uplink SRS transmitted to the UL CoMP receiving point, which can adopt the same value as the PUSCH closed-loop power control. Therefore, unlike the closed-loop power control initial value of the PUSCH power control / £ (0), the UE-Specific closed-loop power control introduced in the power control of the SRS transmitted to the DL CoMP transmission point, its initial value / ⁇ (0) There is an offset value ⁇ £ relative to / £ (0).
  • the closed loop power control value can be adjusted using the cumulative power control mode and the absolute value power control mode.
  • the closed loop power control value of the current subframe is represented by .
  • the closed-loop power control value is expressed by the formula (3) as:
  • the closed loop power control value is expressed by the formula (4) as:
  • - ⁇ denotes the closed-loop power control value at the (z' -1)th subframe, 3 ⁇ 4USCH ;
  • C - ⁇ PUSCH indicates a transmission power control instruction (TPC) indicated by DCI signaling when a subframe (z' _ ⁇ PUSCH ) Command) value.
  • the PUSCH indicates the subframe label " PUSCH ;
  • PUSCH indicates the subframe offset.
  • ⁇ ⁇ 4; in the time division duplex (TDD) system, depending on the UL/DL configuration, ⁇ PUSCH takes different values.
  • step 202 the power control value of the SRS is sent to the DL CoMP transmission point by using the closed loop power control value / (0, the power offset value and the open loop power control value).
  • the power control value is represented by P E (0, expressed by formula (5) as:
  • the parameters of the open loop power control (OLPC) part 5 . — 1>1 ⁇ . (') + « £ ( ' £ may be the same as the parameter of the OLPC part of the SRS power control value sent to the UL CoMP receiving point, as may be the parameter of the PUSCH-based OLPC part.
  • P SRS --. FFSET ⁇ A power offset value in the SRS power control value sent to the UL CoMP receiving point may also be employed.
  • the method may further include:
  • Step 203 Determine, according to the determined power control value P E (0 and the transmit power P eMA ⁇ ( ) configured for the CoMP user equipment to send to the serving cell c in the current subframe, to send the CoMP user equipment to the downlink.
  • step 203 is an optional step.
  • an independent closed-loop power control value is introduced for the SRS power control sent to the downlink transmission point.
  • the path loss between the downlink transmission point and the uplink receiving point to the CoMP UE is used to determine the initial closed-loop power control.
  • the SRS power control problem existing in the network is used to determine the initial closed-loop power control.
  • the method may further include: receiving an instruction sent by the serving cell to which the CoMP user equipment belongs, where the instruction is used to indicate that the CoMP user equipment uses the closed loop power control value dedicated to the user to
  • the line transmission point transmits a closed loop power control value of the sounding reference signal for adjustment.
  • the base station of the serving cell may use lbit signaling to notify the CoMP UE. In this way, the CoMP UE adjusts the power control of the transmitting SRS of the UE according to the received command.
  • the CoMP user equipment is based on the same closed loop power control value as the PUSCH. It is determined that the SRS power is transmitted, which is similar to the prior art, and will not be described again here.
  • the method may further include: obtaining a difference between path loss of the downlink sending point and the uplink receiving point to the CoMP user equipment.
  • obtaining a difference between path loss of the downlink sending point and the uplink receiving point to the CoMP user equipment can be used:
  • the network determines the difference in path loss and notifies the UE, and the upper layer semi-static RRC signaling can be used for notification. Or use the following method:
  • the related information includes: a sending power value of the downlink signal sent by the downlink sending point and the uplink receiving point, or the downlink sending point and the uplink receiving point And a difference between a transmission power value of the transmitted pilot signal and a received power of the downlink signal sent by the downlink transmission point and the uplink receiving point to the CoMP user equipment; and determining, by using the correlation information, the path loss difference.
  • the UE after obtaining the difference of the path loss in the foregoing manner, for example, after receiving the random access response, the UE sends the SRS to the downlink CoMP transmission point, and the dedicated closed loop power control initial value may be the foregoing.
  • the SRS sent by the UE to the downlink CoMP transmission point is initially calculated as the difference between the path loss notified by the network side or calculated by the user side.
  • the method further includes: a user-specific nominal power offset P notified at the serving cell to which the CoMP user equipment belongs. ⁇ puse .
  • the change occurs, or the closed loop power control initial value is reset when the CoMP user equipment receives the random access response signal. That is, the difference of the path loss is obtained again from the network side, or the related information that determines the difference of the path loss is obtained, and the closed loop power control is obtained according to the re-acquired information. Initial value.
  • the user equipment can use the user-specific closed-loop power control according to the received indication, and solve the current SRS power control problem in the heterogeneous network; in addition, the closed loop can also be based on the information sent by the network side.
  • the power control initial value is reset.
  • Embodiment 2 of the present invention further provides a method for controlling transmission power of an uplink sounding reference signal.
  • the method is used in a coordinated multi-point (CoMP) system.
  • CoMP coordinated multi-point
  • the method includes:
  • the serving cell to which the CoMP user equipment belongs sends the difference between the downlink transmission point and the path loss of the uplink receiving point to the CoMP user equipment to the CoMP user equipment, where the path loss difference is used by the user equipment to determine the user-specific closed loop power. Control the initial value; or,
  • the serving cell to which the CoMP user equipment belongs sends relevant information for determining the difference of the path loss to the CoMP user equipment, where the related information is used by the user equipment to determine the difference of the path loss, and determining the user-specific according to the difference of the path loss.
  • the initial value of the closed loop power control, the related information includes: a difference between a transmit power value of the downlink transmit point and the uplink receive point to transmit a pilot signal, or a difference between a transmit power value of the downlink transmit point and the uplink receive point to send a pilot signal, and the difference The difference between the received power of the downlink transmission point and the uplink receiving point and the received power of the CoMP user equipment.
  • the base station of the serving cell to which the CoMP user equipment belongs may send the difference between the downlink transmission point and the path loss of the uplink receiving point to the CoMP user equipment, or send related information that determines the difference of the path loss.
  • the CoMP UE determines the initial value of the closed loop power control dedicated to the user according to the received information, thereby adjusting the closed loop power control value according to the initial value of the closed loop power control, and solving the current SRS power control existing in the heterogeneous network. problem.
  • the serving cell may update the difference of the path loss or the related information of the difference of the path loss according to a high-level radio resource control (RRC) signaling according to a predetermined time interval; or, the serving cell may receive according to the The signal quality of the uplink SRS determines whether to update the difference in path loss or to determine the correlation information related to the difference in path loss, thereby semi-statically configuring the difference in the path loss or the related information of the difference in the path loss.
  • RRC radio resource control
  • the method may further include: the serving cell to which the CoMP user equipment belongs sends an instruction to the CoMP user equipment, where the instruction is used to indicate that the CoMP user equipment uses a user-specific closed loop power control initial value to the downlink.
  • the sending point sends a closed loop power control value of the sounding reference signal for adjustment; or, the command It is used to indicate whether the CoMP user equipment adopts a user-specific closed loop power control initial value or adjusts a closed loop power control value that sends a sounding reference signal to the downlink transmission point by using the same closed loop power control initial value as the uplink data channel.
  • the closed loop power control value for transmitting the sounding reference signal to the downlink transmission point is not adjusted by using the same closed loop power control initial value as the uplink data channel, and the base station side and the UE side may not receive the indication by default.
  • the closed loop power control initial value is modulated with the uplink data channel.
  • the base station of the serving cell may notify the CoMP UE of the instruction by using lbit signaling in the DCI signaling.
  • the base station of the serving cell to which the user equipment belongs may send an instruction to the UE to indicate that the user uses dedicated closed-loop power control, so that the UE adjusts the power control of the SRS sent to the DL CoMP sending point according to the instruction. Solved the current SRS power control problem in heterogeneous networks.
  • the method further includes: determining, by the serving cell, a difference between a path loss of the downlink sending point and an uplink receiving point to the CoMP user equipment.
  • the difference in path loss is determined by the network and the CoMP user equipment is notified.
  • the network side notifies the CoMP user equipment to determine related information of the difference in path loss, so that the CoMP user equipment determines the difference in path loss according to the related information.
  • the method further includes: acquiring related information that determines a difference of the path loss; the related information includes: a transmit power of the downlink signal sent by the downlink sending point and the uplink receiving point, or the downlink sending point and uplink receiving a difference between a transmit power value of the transmit pilot signal and a difference between the received power of the downlink transmit point and the pilot signal sent by the uplink receive point to the CoMP user equipment; and the related information to be notified to the CoMP user equipment .
  • the CoMP user equipment can reset the user-specific closed loop power control initial value.
  • the method further includes: the serving cell notifying the CoMP user equipment user-specific nominal power offset p 1 0 - UE_PUSCH, changing ru- or the base station of the serving cell according to the received CoMP user equipment
  • the transmitted random access guides the CoMP user equipment to send a random access response signal.
  • the CoMP user equipment resets its initial value of the closed-loop power control, that is, obtains the difference between the path loss or the difference of the path loss from the network side.
  • the method for controlling the transmission power of the uplink sounding reference signal will be described in detail below with reference to the scenario shown in FIG.
  • This method is used in a multipoint coordination (CoMP) system, on the downlink of CoMP user equipment.
  • CoMP multipoint coordination
  • the sending point and the upstream receiving point are different.
  • the DL CoMP transmission point is a macro base station
  • the UE CoMP reception point is RRH1.
  • FIG. 3 is a flowchart of a method for controlling transmission power of an uplink sounding reference signal according to Embodiment 3 of the present invention.
  • the difference in path loss ⁇ is determined and notified by the network.
  • the method includes:
  • Step 301 The serving cell to which the CoMP user equipment belongs sends an instruction to the CoMP user equipment, where the instruction is used to indicate that the CoMP user equipment uses a user-specific closed-loop power control initial value to send a closed-loop power of the sounding reference signal to the downlink sending point.
  • the control value is adjusted;
  • the initial value of the closed-loop power control dedicated to the user is determined by the CoMP user equipment according to the obtained difference between the obtained downlink transmission point and the path loss of the uplink receiving point to the CoMP user equipment, and is specifically shown in formula (2).
  • the serving cell c to which the CoMP user equipment belongs may be a macro cell or a micro cell.
  • the serving cell is a macro cell
  • the base station of the serving cell c is The CoMP UE sends the instruction
  • the command may be placed in the downlink control information DCI to notify the CoMP UE, and the UE may be notified by 1 bit. If the 1 bit is "1", the user-specific closed loop may be used.
  • the power control value adjusts the closed-loop power control value for transmitting the SRS to the downlink transmission point; if the one bit is “0”, it may indicate that the SRS is sent to the downlink transmission point without using the user-specific closed-loop power control value.
  • the closed loop power control value is adjusted, such as using a PUSCH based closed loop power control value, and vice versa.
  • Step 302 The serving cell determines a difference between a path loss of the downlink sending point and the uplink receiving point to the CoMP user equipment, and notifies the CoMP user equipment of the path loss difference;
  • the difference in path loss is expressed by the formula (7) as:
  • APL PL - PL
  • the network can roughly estimate the received power difference 5 PP of the pilot signal sent by the uplink and downlink CoMP to the UE, for example, CoMP's RSRP threshold is 5 ?P, thus
  • the APL can be obtained by using the formula (7), but is not limited thereto, and can be obtained by other means.
  • the execution order of the steps 301 and 302 can be performed alternately or in parallel.
  • Step 303 The CoMP UE receives a difference ⁇ between the DL CoMP transmission point and the path loss of the UL CoMP uplink receiving point to the CoMP UE.
  • Step 304 Receive an instruction sent by the serving cell c to which the CoMP user equipment belongs;
  • step 303 and step 304 can be juxtaposed or replaced.
  • the method further includes:
  • Step 308 a user-specific nominal power offset notified by the serving cell c to which the CoMP UE belongs
  • the closed loop power control initial value (0) is reset.
  • the (0) can be reset using equation (2) ;
  • the serving cell c notifies the CoMP UE of the U E Puse through high layer radio resource control (RRC) signaling.
  • RRC radio resource control
  • the UE can determine the difference of the path loss ⁇ PL as the closed-loop power dedicated to the user.
  • the initial value of control ( ⁇ ) is equivalent to receiving the user-specific closed-loop power control initial value directly from the network side / ⁇ (0)
  • the UE CoMP receives the random access response signal, f where is the random access response
  • the TPC command value indicated in the signal, ⁇ ⁇ is the value indicated by the high layer signaling, indicating the power accumulation adjustment value of the UE transmitting the random access signal.
  • the closed loop power control value of the SRS sent to the downlink transmission point in the current subframe is adjusted, and the power control value of the uplink SRS is sent to the downlink transmission point according to the adjusted closed loop power control value, thereby solving the current heterogeneous The SRS power control problem existing in the network; in addition, the initial value of the closed loop power control can be reset.
  • 4 is a flowchart of a method for controlling transmission power of an uplink sounding reference signal according to Embodiment 4 of the present invention.
  • the network informs the UE to determine the information about the difference ⁇ of the path loss, and the user side determines the difference ⁇ of the path loss by itself.
  • the method includes:
  • Step 401 The serving cell to which the CoMP user equipment belongs sends an instruction to the CoMP user equipment, where the instruction is used to indicate that the CoMP user equipment uses a user-specific closed-loop power control initial value to send a closed-loop power of the sounding reference signal to the downlink sending point.
  • the control value is adjusted;
  • the initial value of the closed-loop power control dedicated to the user is determined by the CoMP user equipment according to the obtained difference between the obtained downlink transmission point and the path loss of the uplink receiving point to the CoMP user equipment, and is specifically shown in formula (2).
  • Step 401 is similar to step 301, and details are not described herein again.
  • Step 402 The serving cell to which the CoMP user equipment belongs sends the related information that determines the difference ⁇ of the path loss to the CoMP UE.
  • the related information includes: a transmission power value of the downlink transmission point and the uplink reception point, or a difference ⁇ between the downlink transmission point and the transmission power value of the uplink reception point transmission pilot signal, and the downlink transmission point and The difference between the received power of the pilot signal transmitted by the uplink receiving point and the received power of the CoMP user equipment is ⁇ 3 ⁇ 4? ⁇ ; the correlation information is used to determine the difference of the path loss ⁇ SRP .
  • Step 403 The CoMP UE receives information about the difference ⁇ between the DL CoMP transmission point and the path loss of the UL CoMP uplink receiving point to the CoMP UE sent by the serving cell, and uses the related information to determine the difference of the path loss.
  • ⁇ the difference between the DL CoMP transmission point and the path loss of the UL CoMP uplink receiving point to the CoMP UE sent by the serving cell, and uses the related information to determine the difference of the path loss.
  • Step 404 Receive an instruction sent by the serving cell c to which the CoMP user equipment belongs.
  • step 403 and step 404 can be juxtaposed or replaced.
  • steps 405 to 407 is similar to the step 20 of the step 20 shown in FIG. 2, and the step 408 is similar to the step 308, and details are not described herein again.
  • the network side notifies the relevant information of the difference of the path loss and sends a closed loop power control command
  • the user equipment can determine the difference of the path loss according to the received related information, and adopt the user-specific according to the received indication.
  • the closed loop power control thereby solving the current SRS power control problem in the heterogeneous network; in addition, the closed loop power control initial value can also be reset.
  • the embodiment of the invention further provides a base station and a user equipment, as described in the following embodiments.
  • the principle of the problem is solved by the base station and the user equipment.
  • the implementation of the base station and the user equipment can be implemented by referring to the method.
  • FIG. 5 is a block diagram showing the configuration of a user equipment according to Embodiment 5 of the present invention.
  • the user equipment 500 is a CoMP UE.
  • the downlink transmission point and the uplink reception point of the user equipment are different.
  • the user equipment 500 includes: an adjustment unit 501 and a first processing unit 502;
  • the adjusting unit 501 is configured to adjust, by using a user-specific closed-loop power control initial value, a closed-loop power control value of the sounding reference signal sent to the downlink sending point, where the user-specific closed-loop power control initial value is obtained according to the obtained Determining a difference between a path loss of the downlink transmission point and the uplink receiving point to the CoMP user equipment;
  • the first processing unit 502 is configured to determine, by using the closed loop power control value, the power offset value, and the open loop power control value, a power control value that the current subframe sends the sounding reference signal to the downlink transmission point.
  • the adjustment unit 501 and the first processing unit 502 are similar to the steps 201 and 202, and are not described herein again.
  • FIG. 6 is a block diagram showing the structure of a user equipment according to Embodiment 6 of the present invention.
  • the user equipment 600 is a CoMP UE.
  • the downlink transmission point and the uplink reception point of the user equipment are different.
  • the user equipment 600 includes: an adjustment unit 601 and a first processing unit 602, which function and adjust in the embodiment 5.
  • the function of the unit 501 and the first processing unit 502 is similar, and details are not described herein again.
  • the user equipment 600 may further include: a first receiving unit 603, where the first receiving unit 603 is configured to receive an instruction sent by a base station of a serving cell to which the CoMP user equipment belongs, where the instruction is used to indicate the The CoMP user equipment adjusts the closed-loop power control value for transmitting the sounding reference signal to the downlink transmission point by using the user-specific closed-loop power control value.
  • the adjusting unit 601 of the user equipment 600 can adjust the closed loop power control value for transmitting the sounding reference signal to the downlink sending point according to the instruction received by the first receiving unit 603 by using the user-specific closed loop power control value.
  • the user equipment 600 further includes a second processing unit 604, where the second processing unit 604 is configured to send the CoMP user equipment 600 to the current subframe according to the determined power control value and configuration.
  • the sending power of the serving cell is used to determine the power of the CoMP user equipment to send the sounding reference signal to the downlink sending point.
  • the specific processing procedure is similar to the step 203, and details are not described herein again.
  • the user equipment 600 further includes a first obtaining unit 605, where the first obtaining unit 605 is configured to obtain a difference between path loss of the downlink sending point and the uplink receiving point to the CoMP user equipment.
  • the path loss may be directly received from the base station of the serving cell to which the CoMP user equipment belongs; or the related information that determines the difference of the path loss is received from the base station of the serving cell to which the CoMP user equipment belongs, and the path loss is determined by using the information.
  • the difference is as in the foregoing embodiment ⁇ 4, and details are not described herein again.
  • the user equipment 600 further includes a second receiving unit 606 and a first reset unit 607;
  • the second receiving unit 606 is configured to receive a user-specific nominal power offset P notified by the serving cell to which the CoMP user equipment belongs. - UE PUSeH ; or receiving a random access response signal returned by the serving cell according to the random access preamble sent by the CoMP user equipment;
  • the first reset unit 607 is configured to use a user-specific nominal power offset P notified at the serving cell to which the CoMP user equipment belongs. — The PUSeH changes, or when the random access response signal is received, the closed loop power control initial value is reset.
  • the reset mode of the first reset unit 607 is as described in Embodiment 2-4, and details are not described herein again. It can be seen from the foregoing embodiment that the user equipment can use the user-specific closed-loop power control according to the received command, thereby solving the current SRS power control problem existing in the heterogeneous network; in addition, the initial value of the closed-loop power control can also be performed. Reset.
  • FIG. 7 is a block diagram showing the structure of a base station according to a seventh embodiment of the present invention.
  • the base station is a serving base station of the CoMP UE.
  • the base station 700 includes: a first sending unit 701, where the first sending unit 701 is configured to send, to the CoMP user equipment, a path loss of the downlink sending point and the uplink receiving point to the CoMP user equipment. Poor, the difference in path loss is used by the user equipment to determine a user-specific closed loop power control initial value.
  • the network side notifies the CoMP UE by the difference of the path loss, so that the CoMP UE can determine the initial value of the user-specific closed loop power control according to the difference of the path loss, and perform power adjustment based on the initial value. , solves the problems existing in the prior art.
  • the base station further includes a third processing unit 702 configured to determine a difference in path loss between the downlink transmission point and the uplink reception point to the CoMP user equipment.
  • the base station 700 further includes a third sending unit 703, where the third sending unit 703 is configured to send an instruction to the CoMP user equipment, where the instruction is used to indicate that the CoMP user equipment adopts a user-specific closed loop power control initial.
  • the value is adjusted by adjusting the closed-loop power control value of the sounding reference signal to the downlink transmission point; or, the instruction is used to indicate whether the CoMP user equipment adopts a user-specific closed-loop power control initial value or uses the same closed-loop power control as the uplink data channel.
  • the initial value is adjusted for the closed loop power control value that sends the sounding reference signal to the downlink transmission point.
  • the user equipment does not receive an instruction or performs a PUSCH-based closed-loop power when receiving an instruction to adjust the closed-loop power control value of the sounding reference signal to the downlink transmission point by using the same closed-loop power control initial value as the uplink data channel.
  • the network side may semi-statically configure the difference between the path losses, and notify the UE to reset the difference of the path loss.
  • the base station further includes a second reset unit 704 configured to semi-statically reset the difference in path loss, wherein the difference in path loss can be updated according to a predetermined time interval, or according to receiving The signal quality of the incoming uplink SRS determines whether the difference in path loss is updated.
  • the base station further includes a fourth transmitting unit 705 configured to notify the CoMP user equipment user-specific nominal power offset P. — UE puse . Or, configured to send the random access response signal to the CoMP user equipment according to the received random access sent by the CoMP user equipment. In both cases, after the UE receives the above information notified by the network side, the difference in path loss is reset.
  • the network side sends an instruction to the UE, and the network side determines the difference of the path loss and notifies the UE, so that the UE performs closed-loop power control according to the instruction, which solves the problem in the power control of the SRS in the prior art.
  • FIG. 8 is a block diagram showing the structure of a base station according to Embodiment 8 of the present invention.
  • the base station is a serving base station of the CoMP UE.
  • the base station 800 includes:
  • a second sending unit 801 configured to send, to the CoMP user equipment, related information that determines a difference of the path loss, where the related information is used by the user equipment to determine a difference of the path loss, and further Determining a user-specific closed loop power control initial value according to the difference in path loss;
  • the related information includes: a difference between a transmit power value of the downlink transmit point and the uplink receive point to send a pilot signal, or a difference between a transmit power value of the downlink transmit point and the uplink receive point to send a pilot signal, and the downlink send point and The difference between the received power of the pilot signal sent by the uplink receiving point and the CoMP user equipment.
  • the network side sends related information that determines the difference of the path loss to the UE, so that the UE performs closed-loop power control according to the related information, which solves the problem in the power control of the SRS in the prior art.
  • the base station 800 further includes a fourth processing unit 802 configured to acquire related information that determines the difference in the path loss.
  • the base station further includes: a third sending unit 703 and a fourth sending unit 704, which are not described herein again.
  • a third reset unit 805 is included that is configured to semi-statically reset the associated parameters that determine the difference in path loss.
  • the network side sends an instruction to the UE, and the network side notifies the information about the difference of the path loss, the UE determines the difference of the path loss according to the related information, and performs closed-loop power control according to the instruction, and solves the present problem.
  • the related information can also be configured semi-statically.
  • a base station has some or all of the components in FIG. 7 and FIG. 8 and will not be described here.
  • the embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a CoMP user equipment, the program causes the computer to execute the uplink sounding reference signal described in Embodiments 1, 3, and 4 in the CoMP user equipment.
  • the transmission power control method when the program is executed in a CoMP user equipment, the program causes the computer to execute the uplink sounding reference signal described in Embodiments 1, 3, and 4 in the CoMP user equipment.
  • An embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform transmission power control of an uplink sounding reference signal according to Embodiments 1, 3, and 4 in a CoMP user equipment. method.
  • the embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a base station, the program causes the computer to perform the transmission power control of the uplink sounding reference signal described in Embodiments 2, 3, and 4 in the base station. method.
  • the embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes the computer to execute the transmission power control method of the uplink sounding reference signal described in Embodiments 2, 3, and 4 in the base station.
  • the above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software.
  • the present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps.
  • the present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.
  • the present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that these descriptions are illustrative and not restrictive. A person skilled in the art can make various modifications and changes to the present invention within the scope of the

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Abstract

一种上行探测参考信号的发送功率控制方法，用于多点协作（CoMP）系统，在CoMP用户设备的下行发送点和上行接收点不同时，所述方法包括：采用用户专用的闭环功率控制初始值对向所述下行发送点发送探测参考信号的闭环功率控制值进行调整；其中，所述用户专用的闭环功率控制初始值根据获取的所述下行发送点与上行接收点到所述CoMP用户设备的路径损失之差确定；利用所述闭环功率控制值、功率偏置值和开环功率控制值确定当前子帧向所述下行发送点发送探测参考信号的功率控制值。通过该方法可解决异构网场景下的功率控制的问题。

Description

上行探测参考信号的发送功率控制方法及其装置 技术领域
本发明涉及通信领域，特别涉及一种在 CoMP场景下上行探测参考信号（Sounding Reference Signal, SRS) 的发送功率控制方法及其装置。 背景技术
目前在 Rel-10中， 处在一个小区 （cell) 的用户设备 （User Equipment, IE) 的下行发送点和上行接收点相同， 都是同一个基站 （Base Station, BS)， 因此， 该 UE只需向该下行发送点发送上行 SRS。 在 Rel-10的 SRS功率控制机制中， 发送 SRS 的功率控制值可共享物理上行共享信道 （Physical Uplink Share Channel, PUSCH) 功率控制值中的开环部分和闭环部分， 相对于 PUSCH, 发送该 SRS的功率控制值增加 了一项功率偏移值。
在 LTE-Advanced (LTE-A)系统中， 协作多点 (Coordinated Multi-point, CoMP) 传输 /接收作为关键技术之一被纳入到 LTE-A框架中。 协作传输场景利用地理位置相 邻的传输点协作发送信号给用户或是多点协作接收来自用户的上行信号，对于小区边 缘用户， 尤其能改善信号质量， 扩大覆盖范围。 在 3GPP LTE-A标准化过程中， 对于 上 /下行 CoMP (UL/DL CoMP) 定义了以下四种场景：
CoMP场景 1 (Scenario 1): 同构网络的站址间 CoMP (Homogenous Network with Intra-site CoMP);
CoMP场景 2 (Scenario 2)： 具有高发送功率无线远端单元 （Remote Radio Head, RRH) 的同构网络；
CoMP场景 3 (Scenario 3)： 宏小区范围分布低功率 RRH的具有不同小区 ID的异 构网络场景；
CoMP场景 4 (Scenario 4)： 宏小区范围分布低功率 RRH的具有相同小区 ID的异 构网络场景。
其中， CoMP场景 3和场景 4都属于异构网络场景， 因宏小区覆盖范围内宏基站 (macro eNB) 和微基站 （pico eNB) (或者远端无线头 RRH) 具有不同的发送功率， 如 10MHz带宽的系统下， macro eNB的下行发送功率为 46dBm， pico eNB的发送功率 为 30dBm。 因此按照现有参考信号接收功率 （Reference Signal Received Power, RSRP ) 决定某个 UE的下行发送点， 而根据 UE到各个服务点的距离决定某个 UE的上 行接收点， 会存在其下行发送点为 macro eNB而上行接收点为 pico eNB的情况。 所 以会存在上下行覆盖范围不对称的情况， 即 pico eNB的上行覆盖范围大于其下行覆 盖范围。
对于某个 CoMP UE,可能会存在下行 CoMP发送点和上行 CoMP接收点不同的情况。 在这种异构网络场景下， 若还采用 Rel-10的 SRS功控机制， SRS的发送功率要么以 macro eNB能够正确接收的功率为主， 要么以 RRH1能够正确接收的功率为主， 这样， 在发送上行探测参考信号 （Sounding Reference Signal, SRS ) 的功率控制方面会存 在问题。 即， 如果按照 macro eNB正确接收 SRS的目标调整 SRS发送功率， 则该 CoMP UE始终以较高的发送功率发送 SRS， 会降低用户的电池使用寿命， 并且对 RRH1内服 务的用户造成较大干扰;如果按照 RRH1正确接收 SRS的目标调整 SRS发送，则该 CoMP UE始终以较低的发送功率发送 SRS， 那么 macro eNB可能无法正确接收 SRS。 目前还 没有具体有效的解决上述发送 SRS的功率控制问题的方案。
应该注意， 上面对技术背景的介绍只是为了方便对本发明的技术方案进行清楚、 完整的说明， 并方便本领域技术人员的理解而阐述的。不能仅仅因为这些方案在本发 明的背景技术部分进行了阐述而认为上述技术方案为本领域技术人员所公知。
发明内容
本发明实施例的目的在于提供一种上行探测参考信号的发送功率控制方法及其 装置， 通过给下行发送点的 SRS功率控制引入一个独立闭环功率控制， 对向该下行发 送点发送 SRS的闭环功率控制值进行调整，并根据调整的闭环功率控制值确定向该下 行发送点发送上行 SRS的功率控制值，从而解决了当前在异构网中存在的 SRS功控问 题。
根据本发明实施例的一个方面提供了一种上行探测参考信号的发送功率控制方 法， 用于多点协作 （CoMP ) 系统， 在 CoMP用户设备的下行发送点和上行接收点不同 时， 该方法包括：
采用用户专用的闭环功率控制初始值对向该下行发送点发送的探测参考信号的 闭环功率控制值进行调整； 其中， 该用户专用的闭环功率控制初始值根据获取的该下 行发送点与上行接收点到该 CoMP用户设备的路径损失之差确定；
利用该闭环功率控制值、功率偏置值和开环功率控制值确定当前子帧向该下行发 送点发送探测参考信号的功率控制值。
根据本发明实施例的另一个方面提供了一种上行探测参考信号的发送功率控制 方法， 用于多点协作 （CoMP ) 系统， 在 CoMP用户设备的下行发送点和上行接收点不 同时， 该方法包括：
该 CoMP用户设备所属的服务小区向该 CoMP用户设备发送该下行发送点与该上行 接收点到该 CoMP用户设备的路径损失之差， 该路径损失之差用于该用户设备确定用 户专用的闭环功率控制初始值； 或者，
该 CoMP用户设备所属的服务小区向该 CoMP用户设备发送确定该路径损失之差的 相关信息， 该相关信息用于该用户设备确定该路径损失之差， 并根据该路径损失之差 确定用户专用的闭环功率控制初始值， 该相关信息包括： 该下行发送点与上行接收点 发送导频信号的发送功率值或者该下行发送点与上行接收点发送导频信号的发送功 率值的差值、 以及该下行发送点与上行接收点发送的导频信号到达该 CoMP用户设备 的接收功率的差值。
根据本发明实施例的另一个方面提供了一种用户设备， 该用户设备包括： 调整单元，该调整单元被配置用于采用用户专用的闭环功率控制初始值对向该下 行发送点发送的探测参考信号的闭环功率控制值进行调整； 其中， 该用户专用的闭环 功率控制初始值根据获取的该下行发送点与上行接收点到该 CoMP用户设备的路径损 失之差确定；
第一处理单元， 该第一处理单元被配置用于利用该闭环功率控制值、功率偏置值 和开环功率控制值确定当前子帧向该下行发送点发送探测参考信号的功率控制值。
根据本发明实施例的另一个方面提供了一种基站， 该基站包括：
第一发送单元， 该第一发送单元被配置用于向该 CoMP用户设备发送该下行发送 点与该上行接收点到该 CoMP用户设备的路径损失之差， 该路径损失之差用于该用户 设备确定用户专用的闭环功率控制初始值。
根据本发明实施例的另一个方面提供了一种基站， 该基站包括：
第二发送单元， 该第二发送单元被配置用于向该 CoMP用户设备发送确定该路径 损失之差的相关信息， 该相关信息用于该用户设备确定该路径损失之差， 并根据该路 径损失之差确定用户专用的闭环功率控制初始值；
其中， 该相关信息包括： 该下行发送点与上行接收点发送导频信号的发送功率值 或者该下行发送点与上行接收点发送导频信号的发送功率值的差值、以及该下行发送 点与上行接收点发送的导频信号到达该 CoMP用户设备的接收功率的差值。
根据本发明实施例的另一个方面提供了一种计算机可读程序，其中当在用户设备 中执行该程序时，该程序使得计算机在该用户设备中执行如上所述的上行探测参考信 号的发送功率控制方法。
根据本发明实施例的另一个方面提供了一种存储有计算机可读程序的存储介质， 其中所述计算机可读程序使得计算机在用户设备中执行如上所述的上行探测参考信 号的发送功率控制方法。
根据本发明实施例的另一个方面提供了一种计算机可读程序，其中当在基站中执 行所述程序时，所述程序使得计算机在所述基站中执行如上所述的上行探测参考信号 的发送功率控制方法。
根据本发明实施例的另一个方面提供了一种存储有计算机可读程序的存储介质， 其中所述计算机可读程序使得计算机在基站中执行如上所述的上行探测参考信号的 发送功率控制方法。
本发明实施例的有益效果在于：通过给下行发送点的 SRS功率控制引入一个独立 闭环功率控制，即用户专用的闭环功率控制初始值对向该下行发送点发送 SRS的闭环 功率控制值进行调整， 并根据调整的闭环功率控制值确定向该下行发送点发送上行 SRS的功率控制值， 从而解决了当前在异构网中存在的 SRS功控问题。
参照后文的说明和附图， 详细公开了本发明的特定实施方式， 指明了本发明的 原理可以被采用的方式。 应该理解， 本发明的实施方式在范围上并不因而受到限制。 在所附权利要求的精神和条款的范围内， 本发明的实施方式包括许多改变、修改和等 同。
针对一种实施方式描述和 /或示出的特征可以以相同或类似的方式在一个或更 多个其它实施方式中使用， 与其它实施方式中的特征相组合， 或替代其它实施方式中 的特征。
应该强调，术语 "包括 /包含"在本文使用时指特征、整件、步骤或组件的存在， 但并不排除一个或更多个其它特征、 整件、 步骤或组件的存在或附加。 附图说明
从以下结合附图的详细描述中， 本发明实施例的上述以及其他目的、 特征和优 点将变得更加显而易见， 在附图中：
图 1是 CoMP场景 3/4的示意图；
图 2是本发明实施例 1的上行探测参考信号的发送功率控制方法流程图； 图 3是本发明实施例 3的上行探测参考信号的发送功率控制方法流程图； 图 4是本发明实施例 4的上行探测参考信号的发送功率控制方法流程图； 图 5是本发明实施例 5的用户设备的构成示意图；
图 6是本发明实施例 6的用户设备的构成示意图；
图 7是本发明实施例 7的基站的构成示意图；
图 8是本发明实施例 8的基站的构成示意图。 具体实施方式
下面结合附图对本发明的各种实施方式进行说明。 这些实施方式只是示例性的， 不是对本发明的限制。为了使本领域的技术人员能够容易地理解本发明的原理和实施 方式， 本发明的实施方式以异构网场景的 CoMP场景 3和 CoMP场景 4为例进行说明， 但可以理解， 本发明并不限于上述系统， 对于涉及 SRS的发送功率控制的其他系统均 适用。
首先对目前 Rel-10中的 SRS功控进行说明。
在 Rel-10中， UE所处的小区只有一个基站覆盖， 其上行接收点和下行发送点都 是该基站。 其中， 按照公式 （1) 确定发送 SRS的功率。
O,尸 (m) + 101og10( SRSc) + o (j) + ac(j)-PLc +fc
(1) 如式 （1) 所示， ^ ^ 为用户设备在子帧 上向服务小区 c发送上行 SRS 的发 送功率， 其取值为： peMAX，。w和功率控制值的最小值。 其中， 该功率控制值为：
(w) + 101og10( SRSc) + JPo (j) + ac(j)-PLc+fc{i) 在公式 a)中， Pcmax，。('')是配置给用户设备在子帧 上发送给服务小区 c的最大 发送功率；
在功率控制值中， PsRS-OTFSET，e (Wi)是高层半静态配置的 4 比特参数， 表示相比于 UE发送 PUSCH的发送功率， UE发送 SRS的发送功率的功率偏移值。 m = 0表示触发类 型为 0的 SRS发送， 即周期的 SRS (Periodic SRS, P-SRS ) 发送， w = 1表示触发类 型为 1的 SRS发送， 即非周期的 SRS (Aperiodic SRS, A-SRS) 发送。 是由高层发 送的 UE 专用的无线资源控制 （ Radio Resource Control ， RRC ) 信令 (Upl inkPowerControlDedicated: deltaMCS-Enabled), 表示该功率控制中是否开启 基于 MCS的功率调整， = 1·25时， PsRs ，e( 数值范围为 [_3, i2] dB，步长为 idB ; = 0时， ^—^^^^( 数值范围为[-10. 5, 12] dB, 步长为 L 5dB;
MsRS，c表示 SRS在子帧 上发送给服务小区 c的带宽，以资源块（Resource Block,
RB) 的数量表示；
/c W表示功率控制调整值；
发送 PUSCH时，其功率控制中采用的标称功率 P。— PUSeH包含两部分： 一部分是高 层提供的小区特定参数 P。— N。MINAL PUSeH， 另外一部分是用户专用参数 P。― PUSeH， 也就 疋说， ^ 疋 ^ΝΒ为该小区内所有
UE半静态设定的标称功率， 即小区专用的标称功率， 每个 UE还有 UE专用的标称 功率偏移即 Ρ。― PUSeH， 最终 UE所使用的标称功率是两部分之和即 P。― puseH。 SRS功 率控制中其标称功率可采用与 PUSCH功率控制中相同的值。
是 3bit的路径损耗补偿因子， 由高层告知 UE， SRS功率控制中该路径损耗 补偿因子可采用与 PUSCH功率控制中相同的值。 表示 UE基于下行参考信号所估计的路径损耗值， SRS 功率控制中使用当前 PUSCH功率控制所用的值。
在上述 Rel-10的 SRS功率控制值中， SRS可共享 PUSCH功率控制中相同的开环 部分和闭环部分， 即使用 PUSCH功率控制中的参数 Po pusa^， ac ) , Ρ ^以及 0')， 从公式 （1 ) 可知， 相对于 PUSCH 功率控制， SRS 功率控制增加了一项偏移值
^c ^) 其次， 举例对异构网场景下 SRS功控的问题进行说明。
在 Rel-11异构网络场景的 CoMP场景 3和场景 4下， 由于 pico eNB (类似于 RRH， 即远端无线头） 和 macro eNB发送功率的差异， 对于某个 CoMP UE来说， 会存在其下 行 CoMP发送点和上行 CoMP接收点不同的情况。
图 1是 CoMP场景 3/4的示意图。如图 1所示， CoMP UE的下行是由宏基站（macro eNB) 发送信号， 而由于该 CoMP UE距离 RRH1更近， 其上行是由 RRH1接收信号。 在 此情况下， DL CoMP的发送点和 UL CoMP的接收点不同。 这样， 如果 DL CoMP的发送 点和 UL CoMP的接收点都需要获得 UE发送的 SRS， 则上述 Rel_10的 SRS功控流程机 制不再适用。
例如， 对于时分双工 （Time Division Duplexing, TDD) 系统， 利用上下行信道 的互惠性， SRS不仅用于估计 UL信道状态信息 (Channel State Information, CSI)， 还会用于估计 DL信道状态信息。 即不仅 UL CoMP的接收点需要接收该 CoMP UE发送 的 SRS， 而且该 DL CoMP的发送点也需要接收该 CoMP UE发送的 SRS， 以便该 DL CoMP 的发送点能够估计该 DL CoMP的发送点到 CoMP UE之间的 CSI。然而在图 1所示的 CoMP UE情况下， Rel-10中的 SRS功控流程机制已不再适用。 原因在于：
Rel-10的 SRS功控流程中， 其开环功控 (Open Loop Power Control, OLPC) 部 分与闭环功控 （Closed Loop Power Control, CLPC) 部分均与 PUSCH 功控 （power control, PC)绑定， 即重用 PUSCH的开环和闭环的参数。 而在图 1所示的 CoMP场景 下， 由于 DL CoMP的发送点与 UL CoMP的接收点不同， 在 DL CoMP到 UE之间的链路 与 UL CoMP到 UE之间的链路的路损变化相互独立， 且存在 DL链路与 UL链路的路损 差。 按照 Rel-10 SRS功控的流程， 上行路损的动态变化是通过 PUSCH闭环功控来补 偿的， 即通过公式 （1) 中的闭环功率控制调整值 《来补偿。 网络端不能单独调整 SRS功控以适应其信道动态的变化， 尤其是 SRS发送给该 DL CoMP的发送点时， 现有 SRS功控不能实现动态调整 SRS的发送功率以适应该 CoMP UE到该 DL CoMP发送点的 链路独立于到 UL CoMP的链路的信道变化。
此外， 在异构网络场景下， 发送给 Macro eNB的功率要高于发送给 RRH1的发送 功率， 如果保持 Rel-10—个 SRS功控机制流程， SRS的发送功率要么以 Nacro eNB 能够正确接收的功率为主， 要么以 RRH1能够正确接收的功率为主， 这两种情况均会 产生问题， 如背景技术所述。 因此， 在 Rel-11的 CoMP场景下， 需要解决 SRS功控的 问题， 从而既便于 UL CoMP的 CSI估计也便于 DL CoMP的 CSI估计。
当前 3GPP RAN1标准中正在讨论的解决方案主要有如下两种：
第一种：
在 SRS功控公式中引入多个功率偏移值 ^S-^sET^^ , m = 0, l, 2, ..., N - l r 且其 数值范围扩大。 在原 Rel-10的 SRS功控中，存在两个功率偏移值 Ρ 。 w = 0禾 p = 1时 对应的功率偏移值 ^ 。
在这种方法中， 相对于 Rel-10 SRS功控， 引入了 W≥ 2的 SRS功率偏移值， 从而 能够实现 A-SRS发送给 DL CoMP和发送给 UL CoMP时采用不同的 SRS功率偏移值。 其 中， 发送给 DL CoMP发送点和发送给 UL CoMP接收点的 SRS是不同类型的 SRS， 例如， 发送给 DL CoMP发送点的是 A-SRS , 而发送给 UL CoMP接收点的是 P_SRS， 则两个值 即可。 例如， 发送给 DL CoMP的 SRS是 A-SRS , 发送给 UL CoMP的 SRS既可以是 A-SRS 也可以是 P_SRS。 那么此时需要 3个功率偏移值。
然而目前，需要通过仿真验证此功率偏移值的范围需要扩大到多少以及需要几个 SRS功率偏移值即 W的数值大小。 而且这种方法并不能区分 DL CoMP, UL CoMP到该 用户链路之间的动态、 独立的信道变化。
第二种： 为发送给 DL CoMP的 SRS单独引入一个功率控制流程。 但目前没有具体 的实现方案。
本发明实施例主要针对在 SRS功控中引入额外的闭环功控以解决上述问题。以下 通过实施例来说明本发明实施例的 CoMP场景下上行 SRS的发送功率控制方法及其装 置。
图 2是本发明实施例 1的上行探测参考信号的发送功率控制方法流程图。该方法 用于多点协作 （CoMP ) 系统， 在 CoMP用户设备的下行发送点和上行接收点不同时， 如图 2所示， 在用户设备侧， 该方法包括：
步骤 201， 采用用户专用 （UE-Specifi c ) 的闭环功率控制初始值对向该下行发 送点发送的探测参考信号 （SRS ) 的闭环功率控制值进行调整； 其中， 该用户专用的 闭环功率控制初始值根据获取的该下行发送点与上行接收点到该 CoMP用户设备的路 径损失之差确定； 步骤 202， 利用该闭环功率控制值、 功率偏置值和开环功率控制值确定当前子帧 向该下行发送点发送探测参考信号的功率控制值。
在本实施例中， 下行发送点为 DL CoMP发送点， 可以是宏基站也可以是微基站或 RRH; 上行接收点为 UL CoMP接收点， 可以是宏基站也可以是微基站或 RRH。
当该 DL CoMP发送点和该 UL CoMP接收点不同时， 该 DL CoMP发送点到该 CoMP UE 之间的链路和该 UL CoMP接收点到该 CoMP UE之间的链路之间的路损变化相互独立， 且存在路损差值。 如果 PUSCH功控机制运行良好， 发送给该 UL CoMP接收点的 SRS功 控能够很好的补偿该 UL CoMP接收点到该 CoMP UE之间的链路的路径损失 PL。 此时 发送给该 DL CoMP发送点的 SRS功控中， 该 DL CoMP发送点到该 CoMP UE的 PL与该 UL CoMP接收点到该 CoMP UE的 PL之间的路径损失之差依赖于该用户专用的闭环功 控实现。 其中， 该 DL CoMP发送点和 UL CoMP接收点到该 CoMP UE的路损差值由闭 环功控的初始值补偿。
因此， 在步骤 201中， 利用 DL CoMP发送点和 UL CoMP接收点到该 CoMP UE的 路损差来确定闭环功率控制初始值。
在本实施例中， 该闭环功率控制初始值用/ ^ (0)表示， 该闭环功率控制初始值用 公式 （2 ) 表示为： (0) = /ε (0) + ΔΡ ( 2 )
在公式 （2 ) 中， /£ (0)表示发送给 ULCoMP接收点的上行 SRS的功率控制值中 的闭环功率控制初始值， 其可采用与 PUSCH闭环功率控制相同的值。 因此， 不同于 PUSCH功控的闭环功控初始值 /£ (0)，在发送给 DL CoMP发送点的 SRS的功率控制 中所引入的 UE-Specific闭环功控，其初始值/^ (0)相对于 /£ (0)存在一个偏移值 ΔΡ£。
此外， 在步骤 201中， 可采用累积功率控制方式和绝对值功率控制方式对闭环功 率控制值进行调整。 如当前子帧 的闭环功率控制值用 表示。
在采用累积功率控制方式时， 该闭环功率控制值用公式 （3 ) 表示为：
Κ (0 = K (i - 1) + δ H,c (i - K ) ( 3 )
在采用绝对值功率控制方式时， 该闭环功率控制值用公式 （4 ) 表示为：
(0 = ^PUSCH (Z _ ^ PUSCH ) ( 4 ) 在上述公式 （3 ) 和 （4 ) 中， — ^表示第 （z' -l ) 子帧时的闭环功率控制值， ¾USCH;C -^PUSCH)表示子帧（ z' _ ^PUSCH )时 DCI信令所指示的发送功率控制指令（TPC command)值。其中， PUSCH表示的是子帧标号 " PUSCH； PUSCH表示子帧偏移量。 频分双工 FDD (Frequency Division Duplexing) 系统中 ^ρυίίαι=4; 时分双工 （TDD) 系统中， 会根据不同的 UL/DL配置， ^PUSCH取不同的值。
在本实施例中， 在步骤 202中， 在利用该闭环功率控制值/ ^(0、功率偏置值和开 环功率控制值确定当前子帧 向该 DL CoMP发送点发送 SRS的功率控制值。 其中， 该 功率控制值用 PE(0表示， 用公式 （5) 表示为：
Pc (0 = ^S S OFFSET PUSCH,c (j) + ac(j)-PLc +hc{i) (5) 在公式 （5) 中的各个量的含义与公式 （1) 类似， 此处不再赘述。
其中， 开环功控 （OLPC) 部分的参数， 5。—1>1^ 。(') + «£( ' £可与发送给 UL CoMP接收点的 SRS功率控制值中的 OLPC部分的参数相同，如可为基于 PUSCH的 OLPC部分的参数。 另外， PSRS―。 FFSET^ )也可采用与发送给 UL CoMP接收点的 SRS 功率控制值中的功率偏移值。
这样， 在获得该功率控制值 (0后， 该方法还可包括：
步骤 203， 根据确定的该功率控制值 PE(0和配置给该 CoMP用户设备在该当前子 帧 上发送给服务小区 c的发送功率 PeMA^ ()来确定该 CoMP用户设备向该下行发送点 发送探测参考信号的功率 PSRS>£(0；
其中， 可从该 ^(0和预先配置给该 UE在子帧 上发送给服务小区 c的发送功率 MAX O中选择最小的值作为向 DL CoMP发送点发送上行 SRS的发送功率 PSRS )。 即尸 SRS,C ('·) = min { CMAX;C (), Pc () } ( 6 )
在本实施例中， 步骤 203为可选步骤。
由上述实施例可知，为发送给下行发送点的 SRS功率控制引入一个独立的闭环功 率控制值， 具体地， 利用下行发送点和上行接收点到该 CoMP UE的路损差来确定闭环 功率控制初始值，从而对当前子帧向该下行发送点发送 SRS的闭环功率控制值进行调 整， 并根据调整的闭环功率控制值确定向该下行发送点发送上行 SRS的功率控制值， 从而解决了当前在异构网中存在的 SRS功控问题。
在本实施例中， 该方法还可包括： 接收该 CoMP用户设备所属服务小区发送的指 令， 该指令用于指示该 CoMP用户设备采用该用户专用的闭环功率控制值对向所述下 行发送点发送探测参考信号的闭环功率控制值进行调整。其中， 该服务小区的基站可 采用 lbit的信令来通知该 CoMP UE。 这样使得该 CoMP UE根据接收到的指令对该 UE 的发送 SRS的功率控制进行调整。
在本实施例中，如果该用户设备未收到基站侧发送的指示或者接收到基站侧指示 基于与 PUSCH相同的闭环功率控制值时， 则该 CoMP用户设备基于与 PUSCH相同的闭 环功率控制值来确定发送 SRS功率， 与现有技术类似， 此次不再赘述。
在本实施例中， 该方法还可包括： 获取该下行发送点与上行接收点到该 CoMP用 户设备的路径损失之差。 其中， 可采用如下两种方式：
接收该 CoMP用户设备所属服务小区通知的该下行发送点与该上行接收点到所述 CoMP用户设备的路径损失之差；
在这种方式中， 由网络端决定该路径损失之差并通知该 UE, 可采用高层半静态 RRC信令通知。 或者采用如下方式：
接收该 CoMP用户设备所属服务小区发送的确定该路径损失之差的相关信息； 该 相关信息包括：该下行发送点与上行接收点发送导频信号的发送功率值或者该下行发 送点与上行接收点发送导频信号的发送功率值的差值、以及该下行发送点与上行接收 点发送的导频信号到达该 CoMP用户设备的接收功率的差值； 利用该相关信息确定所 述路径损失之差。
在本实施例中， 通过上述方式获得该路径损失之差后， 例如， 对于接收到随机接 入响应之后， 该 UE发给下行 CoMP发送点的 SRS， 其专用的闭环功率控制初始值可采 用上述公式（ 2 )计算获得，其中， = （Q) + ^ = ^P-P + Δ + ；其中 δ 是随机接入响应信号中指示的 TPC command值， " 是高层信令指示的值， 表示 UE发送随机接入信号的功率累积调整值。 例如， 对于其他情况， 该 UE发给下行 CoMP 发送点的 SRS， 其功率控制初始值为网络侧通知的或者用户侧计算获得的路径损失之 差。
在本实施例中， 该方法还包括： 在该 CoMP用户设备所属服务小区通知的用户专 用的标称功率偏移 P。― puse 。发生变化、 或者在该 CoMP用户设备接收到随机接入响 应信号时， 重置该闭环功率控制初始值。 即重新从网络侧获得路径损失之差、 或者获 得确定该路径损失之差的相关信息，并根据重新获取的上述信息来获得闭环功率控制 初始值。
由上述实施例可知， 用户设备可根据接收到的指示采用用户专用的闭环功率控 制， 解决了当前在异构网中存在的 SRS功控问题； 此外， 还可根据网络侧发送的信息 对该闭环功率控制初始值进行重置。
本发明实施例 2还提供一种上行探测参考信号的发送功率控制方法。该方法用于 多点协作 （CoMP ) 系统， 在 CoMP用户设备的下行发送点和上行接收点不同时， 在网 络端， 该方法包括：
该 CoMP用户设备所属的服务小区向该 CoMP用户设备发送该下行发送点与该上行 接收点到该 CoMP用户设备的路径损失之差， 该路径损失之差用于该用户设备确定用 户专用的闭环功率控制初始值； 或者，
该 CoMP用户设备所属的服务小区向该 CoMP用户设备发送确定该路径损失之差的 相关信息， 该相关信息用于该用户设备确定该路径损失之差， 并根据该路径损失之差 确定用户专用的闭环功率控制初始值， 该相关信息包括： 该下行发送点与上行接收点 发送导频信号的发送功率值或者该下行发送点与上行接收点发送导频信号的发送功 率值的差值、 以及该下行发送点与上行接收点发送的导频信号到达该 CoMP用户设备 的接收功率的差值。
由上述实施例可知， CoMP用户设备所属服务小区的基站可向该 UE发送该下行发 送点与该上行接收点到该 CoMP用户设备的路径损失之差、 或者发送确定该路径损失 之差的相关信息， 使得该 CoMP UE根据接收到的信息确定用户专用的闭环功率控制初 始值， 从而根据该闭环功率控制初始值对其闭环功率控制值进行调整， 解决了当前在 异构网中存在的 SRS功控问题。
在本实施例中， 该服务小区可通过高层无线资源控制 （RRC ) 信令按照预定时间 间隔更新该路径损失之差或者该确定路径损失之差的相关信息； 或者， 该服务小区可 根据接收到的上行 SRS 的信号质量确定是否更新该路径损失之差或者确定与该路径 损失之差相关的该相关信息，从而半静态地配置该路径损失之差或者该确定路径损失 之差的相关信息。
在本实施例中， 该方法还可包括： 该 CoMP用户设备所属的服务小区向该 CoMP用 户设备发送指令， 该指令用于指示该 CoMP用户设备采用用户专用的闭环功率控制初 始值对向该下行发送点发送探测参考信号的闭环功率控制值进行调整； 或者， 该指令 用于指示该 CoMP用户设备采用用户专用的闭环功率控制初始值还是采用与上行数据 信道相同的闭环功率控制初始值对向该下行发送点发送探测参考信号的闭环功率控 制值进行调整。
其中，对于不指示采用与上行数据信道相同的闭环功率控制初始值对向该下行发 送点发送探测参考信号的闭环功率控制值进行调整的情况， 在基站侧和 UE侧可默认 在未收到指示的情况下采用与上行数据信道相同的闭环功率控制初始值进行调制。
由本实施例中， 该服务小区的基站可通过 DCI信令中的 lbit信令将该指令通知 该 CoMP UE
由上述实施例可知， 用户设备所属服务小区的基站可向该 UE发送指示其采用用 户专用的闭环功率控制的指令， 使得 UE根据该指令对向 DL CoMP发送点发送的 SRS 的功率控制进行调整， 解决了当前在异构网中存在的 SRS功控问题。
在本实施例中， 该方法还包括： 该服务小区确定该下行发送点与上行接收点到该 CoMP 用户设备的路径损失之差。 在这种情况下， 由网络端确定该路径损失之差并通 知该 CoMP用户设备。
在另一个实施例中， 由网络侧通知该 CoMP用户设备确定该路径损失之差的相关 信息， 使得该 CoMP用户设备根据该相关信息确定该路径损失之差。 在这种情况下， 该方法还包括： 获取确定该路径损失之差的相关信息； 该相关信息包括： 该下行发送 点与上行接收点发送导频信号的发送功率或者该下行发送点与上行接收点发送导频 信号的发送功率值的差值、 以及该下行发送点与上行接收点发送的导频信号到达该 CoMP用户设备的接收功率的差值； 将获得的该相关信息通知该 CoMP用户设备。
在本实施例中， 该 CoMP用户设备可重置该用户专用的闭环功率控制初始值。 这 样， 该方法还包括： 该服务小区通知该 CoMP 用户设备用户专用的标称功率偏移 p 1 0— UE— PUSCH,发生变化 ru- 或者， 该服务小区的基站根据接收到的该 CoMP用户设备发送的随机接入前导向 该 CoMP用户设备发送随机接入响应信号。
在上述两种情况下， 该 CoMP用户设备会对其闭环功率控制初始值进行重置， 即 重新从网络侧获得该路径损耗之差或确定该路径损耗之差的相关信息。
下面结合附图 1 所示的场景对本发明实施例的上行探测参考信号的发送功率控 制方法进行详细说明。 该方法用于多点协作 （CoMP ) 系统， 在 CoMP用户设备的下行 发送点和上行接收点不同时。 其中， 对于 CoMP UE, 该 DL CoMP发送点为宏基站， 该 UE CoMP接收点为 RRH1。
图 3是本发明实施例 3的上行探测参考信号的发送功率控制方法流程图。在本实 施例中， 由网络端确定并通知路径损失之差 ΔΡ 。
在网络端， 如图 3所示， 该方法包括：
步骤 301， 该 CoMP用户设备所属的服务小区向该 CoMP用户设备发送指令， 该指 令用于指示该 CoMP用户设备采用用户专用的闭环功率控制初始值对向该下行发送点 发送探测参考信号的闭环功率控制值进行调整；
其中， 该用户专用的闭环功率控制初始值是该 CoMP用户设备根据获取的该下行 发送点与上行接收点到该 CoMP用户设备的路径损失之差 ΔΡ£确定， 具体见公式（2)。
在本实施例中， 该 CoMP用户设备所属服务小区 c可为宏小区， 也可为微小区； 在图 1所示的场景下， 该服务小区为宏小区， 则由该服务小区 c的基站向该 CoMP UE 发送该指令；
在本实施例中， 可将该指令置于下行控制信息 DCI中通知该 CoMP UE, 可采用 1 个比特来通知该 UE， 如该 1个比特为 " 1 "时， 可表示使用用户专用的闭环功率控制 值对向该下行发送点发送 SRS的闭环功率控制值进行调整； 如该 1个比特为 "0 "时， 可表示不使用用户专用的闭环功率控制值对向该下行发送点发送 SRS 的闭环功率控 制值进行调整， 如使用基于 PUSCH的闭环功率控制值， 反之亦然。
步骤 302， 该服务小区确定该下行发送点与上行接收点到该 CoMP用户设备的路 径损失之差， 并将该路径损失之差通知该 CoMP用户设备；
在本实施例中， 该路径损失之差 用公式 （7 ) 表示为：
APL = PL - PL
= AT - ARSRP 在公式 （7 ) 中， 7丽 ， ^∞分别表示 macro eNB和 pico eNB (或者为 RRH) 发 送导频信号的发送功率值， ^^^。和^^^^分别表示 UE接收来自 macro eNB和 pico eNB的导频信号的接收功率值。 网络端已知 macro eNB以及 pico eNB发送导频 信号的发送功率， 从而已知 AT值，此外网络端可以粗略估计上下行 CoMP发送的导频 信号到达 UE的接收功率差值 5 ?P， 例如将 CoMP的 RSRP门限值作为 5 ?P， 从而 可利用公式 （7 ) 获得该 APL 但不限于此， 还可通过其他方式获得 A^ ?P 在上述实施例中，步骤 301和 302的执行顺序可互置或并列执行。在用户设备侧： 步骤 303， 该 CoMP UE接收该 DL CoMP发送点与 UL CoMP上行接收点到该 CoMP UE 的路径损失之差 ΔΡ
步骤 304， 接收该 CoMP用户设备所属服务小区 c发送的指令；
该步骤 303和步骤 304的顺序可以并列或置换。
步骤 305〜步骤 307的执行过程与图 2所示的步骤 20广步骤 203类似， 此处不再 赘述。
在本实施例中， 该方法还包括：
步骤 308， 在该 CoMP UE 所属服务小区 c 通知的用户专用的标称功率偏移
UE— Puse 。发生变化、 或者在该 CoMP用户设备接收到该服务小区根据该 CoMP UE发 送的随机接入前导返回的随机接入响应信号时， 重置该闭环功率控制初始值 (0) 在本实施例中， 可采用公式 （2 ) 重置该 (0) ;
其中， 在该服务小区 c 通过高层无线资源控制 （RRC ) 信令通知该 CoMP UE 该 UE Puse 。发生变化， /£ (0) = 0， 这种情况下， 该 UE在接收到到网络侧发送的路径 损失之差 ^PL后， 可确定该路径损失之差 ^PL为该用户专用的闭环功率控制初始值 ^ (0)， 即相当于直接从网络侧接收用户专用的闭环功率控制初始值/ ^ (0) 在该 UE CoMP接收到随机接入响应信号时， f 其中， 是 随机接入响应信号中指示的 TPC command值， ^ ^是高层信令指示的值， 表示 UE 发送随机接入信号的功率累积调整值。 在这种情况下， 该 UE需要根据该路径损失之 差 ΔΡ£和 (0) = + 计算获得该用户专用的闭环功率控制初始值 hc (0) 由上述实施例可知， 由网络侧确定路径损失之差并发送闭环功控指令， 用户设备 可根据接收到的指示采用用户专用的闭环功率控制，其中利用下行发送点和上行接收 点到该 CoMP UE的路损差来确定闭环功率控制初始值， 从而对当前子帧向该下行发送 点发送 SRS的闭环功率控制值进行调整，并根据调整的闭环功率控制值确定向该下行 发送点发送上行 SRS的功率控制值，从而解决了当前在异构网中存在的 SRS功控问题； 此外， 还可对该闭环功率控制初始值进行重置。 图 4是本发明实施例 4的上行探测参考信号的发送功率控制方法流程图。在本实 施例中， 由网络端通知 UE确定路径损失之差 ΔΡ£的相关信息， 由用户侧自己确定该 路径损失之差 ΔΡ 。
在网络端， 如图 4所示， 该方法包括：
步骤 401， 该 CoMP用户设备所属的服务小区向该 CoMP用户设备发送指令， 该指 令用于指示该 CoMP用户设备采用用户专用的闭环功率控制初始值对向该下行发送点 发送探测参考信号的闭环功率控制值进行调整；
其中， 该用户专用的闭环功率控制初始值是该 CoMP用户设备根据获取的该下行 发送点与上行接收点到该 CoMP用户设备的路径损失之差 ΔΡ£确定， 具体见公式（2)。
步骤 401与步骤 301类似， 此处不再赘述。
步骤 402， 该 CoMP用户设备所属服务小区向该 CoMP UE发送确定该路径损失之 差 ΔΡ£的相关信息；
该相关信息包括：该下行发送点与上行接收点发送导频信号的发送功率值 Γ或者 该下行发送点与上行接收点发送导频信号的发送功率值的差值 ΔΓ、 以及该下行发送 点与上行接收点发送的导频信号到达该 CoMP用户设备的接收功率的差值 ΔΛ¾?Ρ； 利 用该相关信息确定该路径损失之差 ^SRP。
在用户设备侧：
步骤 403， 该 CoMP UE接收该服务小区发送的确定该 DL CoMP发送点与 UL CoMP 上行接收点到该 CoMP UE的路径损失之差 ΔΡ£的相关信息， 并利用该相关信息确定该 路径损失之差 ΔΡ ；
在本实施例中， 可采用公式 （7 ) 确定该路径损失之差 ΔΡ£， 此处不再赘述。 步骤 404， 接收该 CoMP用户设备所属服务小区 c发送的指令；
该步骤 403和步骤 404的顺序可以并列或置换。
步骤 405〜步骤 407的执行过程与图 2所示的步骤 20广步骤 204类似， 步骤 408 与步骤 308类似， 此处不再赘述。
由上述实施例可知， 由网络侧通知确定路径损失之差的相关信息并发送闭环功控 指令， 用户设备可根据接收到的相关信息确定该路径损失之差， 并根据接收到的指示 采用用户专用的闭环功率控制，， 从而解决了当前在异构网中存在的 SRS功控问题； 此外， 还可对该闭环功率控制初始值进行重置。 本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤是可以 通过程序来指令相关的硬件完成， 所述的程序可以存储于一计算机可读取存储介质 中， 该程序在执行时， 可以包括上述实施例方法中的全部或部分步骤， 所述的存储介 质可以包括： R0M、 RAM, 磁盘、 光盘等。
本发明实施例还提供了一种基站和用户设备， 如下面的实施例所述。 由于该基站 和用户设备解决问题的原理与上述基于基站和用户设备的上行探测参考信号的发送 功率控制方法相似， 因此该基站和用户设备的实施可以参见方法的实施， 重复之处不 再赘述。
图 5是本发明实施例 5的用户设备的构成示意图。 该用户设备 500为 CoMP UE。 在 CoMP系统架构下， 该用户设备的下行发送点和上行接收点不同， 如图 5所示， 该 用户设备 500包括： 调整单元 501和第一处理单元 502 ; 其中，
调整单元 501， 被配置用于采用用户专用的闭环功率控制初始值对向该下行发送 点发送的探测参考信号的闭环功率控制值进行调整； 其中， 该用户专用的闭环功率控 制初始值根据获取的该下行发送点与上行接收点到该 CoMP用户设备的路径损失之差 确定；
第一处理单元 502， 被配置用于利用该闭环功率控制值、 功率偏置值和开环功率 控制值确定当前子帧向该下行发送点发送探测参考信号的功率控制值。
在上述实施例中，调整单元 501和第一处理单元 502的工作方式与步骤 201和步 骤 202类似， 此处不再赘述。
图 6是本发明实施例 6的用户设备的构成示意图。 该用户设备 600为 CoMP UE。 在 CoMP系统架构下， 该用户设备的下行发送点和上行接收点不同， 如图 6所示， 该 用户设备 600包括： 调整单元 601和第一处理单元 602， 其作用与实施例 5中的调整 单元 501和第一处理单元 502的作用类似， 此处不再赘述。
如图 6所示，该用户设备 600还可包括：第一接收单元 603，该第一接收单元 603 被配置用于接收该 CoMP用户设备所属服务小区的基站发送的指令， 该指令用于指示 该 CoMP用户设备采用该用户专用的闭环功率控制值对向该下行发送点发送探测参考 信号的闭环功率控制值进行调整。这样， 该用户设备 600的调整单元 601可根据第一 接收单元 603 接收到的指令采用该用户专用的闭环功率控制值对向该下行发送点发 送探测参考信号的闭环功率控制值进行调整。 如图 6所示， 该用户设备 600还包括第二处理单元 604， 第二处理单元 604被配 置用于根据确定的该功率控制值和配置给该 CoMP用户设备 600在该当前子帧上发送 给服务小区的发送功率来确定该 CoMP用户设备向该下行发送点发送探测参考信号的 功率， 其具体处理过程与步骤 203类似， 此处不再赘述。
如图 6所示， 该用户设备 600还包括第一获取单元 605， 第一获取单元 605被配 置用于获取该下行发送点与上行接收点到该 CoMP用户设备的路径损失之差。 其中， 可直接从该 CoMP用户设备所属服务小区的基站接收该路径损失之差； 或者从该 CoMP 用户设备所属服务小区的基站接收确定该路径损失之差的相关信息，利用该信息确定 该路径损失之差， 如前述实施例 Γ4， 此处不再赘述。
如图 6所示， 还用户设备 600还包括第二接收单元 606和第一重置单元 607 ; 其 中，
第二接收单元 606， 被配置用于接收该 CoMP用户设备所属服务小区通知的用户 专用的标称功率偏移 P。— UE PUSeH； 或者接收所述服务小区根据该 CoMP用户设备发送的 随机接入前导返回的随机接入响应信号；
第一重置单元 607， 被配置用于在该 CoMP用户设备所属服务小区通知的用户专 用的标称功率偏移 P。— PUSeH发生变化、 或者在接收到随机接入响应信号时， 重置该 闭环功率控制初始值。
在本实施例中，第一重置单元 607的重置方式如实施例 2-4所述，此处不再赘述。 由上述实施例可知， 用户设备可根据接收到的指令采用用户专用的闭环功率控 制， 从而解决了当前在异构网中存在的 SRS功控问题； 此外， 还可对该闭环功率控制 初始值进行重置。
图 7是本发明实施例 7的基站构成示意图。 该基站为该 CoMP UE的服务基站。 如图 7所示， 该基站 700包括： 第一发送单元 701， 第一发送单元 701被配置用 于向该 CoMP用户设备发送该下行发送点与该上行接收点到该 CoMP用户设备的路径损 失之差， 该路径损失之差用于该用户设备确定用户专用的闭环功率控制初始值。
有上述实施例可知， 网络侧通过将该路径损失之差通知该 CoMP UE， 使得该 CoMP UE 可根据该路径损失之差确定用户专用的闭环功控的初始值， 并基于该初始值进行 功率调整， 解决了现有技术中存在的问题。
在本实施例中， 由网络侧直接确定该路径损失之差，在这种情况下，如图 7所示， 该基站还包括第三处理单元 702， 第三处理单元 702被配置用于确定该下行发送点与 上行接收点到该 CoMP用户设备的路径损失之差。
如图 7所示， 基站 700还包括第三发送单元 703， 第三发送单元 703被配置用于 向该 CoMP用户设备发送指令，该指令用于指示该 CoMP用户设备采用用户专用的闭环 功率控制初始值对向该下行发送点发送探测参考信号的闭环功率控制值进行调整；或 者， 该指令用于指示该 CoMP用户设备采用用户专用的闭环功率控制初始值还是采用 与上行数据信道相同的闭环功率控制初始值对向该下行发送点发送探测参考信号的 闭环功率控制值进行调整。
这样，用户设备未接收到指令或者在接收到采用与上行数据信道相同的闭环功率 控制初始值对向该下行发送点发送探测参考信号的闭环功率控制值进行调整的指令 时进行基于 PUSCH的闭环功率控制初始值进行功率调整；在接收到采用用户专用的闭 环功率控制初始值对向该下行发送点发送探测参考信号的闭环功率控制值进行调整 的指令时， 基于用户专用的闭环功率控制初始值进行功率调整。
在本实施例中， 网络侧可对该路径损耗之差进行半静态配置， 并且通知该 UE重 置该路径损耗之差。 这样， 该基站还包括第二重置单元 704， 第二重置单元 704被配 置用于半静态地重置该路径损失之差， 其中可按照预定时间间隔更新该路径损失之 差， 或者根据接收到的上行 SRS的信号质量确定是否更新该路径损失之差。
并且网络侧还通过信息通知该 UE重置该路径损失之差。 在这种情况下， 该基站 还包括第四发送单元 705， 该第四发送单元被配置用于通知该 CoMP用户设备用户专 用的标称功率偏移 P。— UE puse 。； 或者， 被配置用于根据接收到的该 CoMP用户设备发 送的随机接入前导向该 CoMP用户设备发送随机接入响应信号。在这两种情况下，当该 UE接收到网络侧通知的上述信息后， 对路径损耗之差进行重置。
由上述实施例可知， 网络侧向 UE发送指令， 且网络侧确定路径损失之差并通知 该 UE， 使得 UE根据指令进行闭环功率控制， 解决了现有技术中 SRS的功控中存在的 问题。
图 8是本发明实施例 8的基站构成示意图。 该基站为该 CoMP UE的服务基站。 如图 8所示， 基站 800包括：
第二发送单元 801， 第二发送单元 800被配置用于向该 CoMP用户设备发送确定 该路径损失之差的相关信息， 该相关信息用于该用户设备确定该路径损失之差， 并根 据该路径损失之差确定用户专用的闭环功率控制初始值；
其中， 该相关信息包括： 该下行发送点与上行接收点发送导频信号的发送功率值 或者该下行发送点与上行接收点发送导频信号的发送功率值的差值、以及该下行发送 点与上行接收点发送的导频信号到达该 CoMP用户设备的接收功率的差值。
由上述实施例可知， 网络侧向 UE发送确定路径损失之差的相关信息， 使得 UE根 据该相关信息进行闭环功率控制， 解决了现有技术中 SRS的功控中存在的问题。
如图 8所示， 该基站 800还包括第四处理单元 802， 被配置用于获取确定该路径 损失之差的相关信息。
与实施例 7类似， 该基站还包括： 第三发送单元 703和第四发送单元 704， 此处 不再赘述。
此外， 还包括第三重置单元 805， 被配置用于半静态地重置确定路径损失之差的 相关参数。
由上述实施例可知， 网络侧向 UE发送指令， 且网络侧通知确定路径损失之差的 相关信息， 该 UE根据该相关信息确定该路径损失之差， 并根据指令进行闭环功率控 制，解决了现有技术中 SRS的功控中存在的问题。此外，还可半静态配置该相关信息。
在图 7和图 8所示的实施例中， 各个部件可以根据实际情况自由组合。 例如， 一 个基站同时具备图 7和图 8中的部分或全部部件， 此处不再赘述。
本发明实施例还提供一种计算机可读程序，其中当在 CoMP用户设备中执行该程 序时， 该程序使得计算机在该 CoMP用户设备中执行实施例 1、 3、 4所述的上行探测 参考信号的发送功率控制方法。
本发明实施例还提供一种存储有计算机可读程序的存储介质， 其中该计算机可 读程序使得计算机在 CoMP用户设备中执行实施例 1、 3、 4所述的上行探测参考信号 的发送功率控制方法。
本发明实施例还提供一种计算机可读程序， 其中当在基站中执行该程序时， 该 程序使得计算机在该基站中执行实施例 2、 3、 4所述的上行探测参考信号的发送功率 控制方法。
本发明实施例还提供一种存储有计算机可读程序的存储介质， 其中该计算机可 读程序使得计算机在基站中执行实施例 2、 3、 4所述的上行探测参考信号的发送功率 控制方法。 本发明以上的装置和方法可以由硬件实现， 也可以由硬件结合软件实现。本发明 涉及这样的计算机可读程序， 当该程序被逻辑部件所执行时， 能够使该逻辑部件实现 上文所述的装置或构成部件， 或使该逻辑部件实现上文所述的各种方法或步骤。本发 明还涉及用于存储以上程序的存储介质， 如硬盘、 磁盘、 光盘、 DVD、 flash 存储器 等。 以上结合具体的实施方式对本发明进行了描述， 但本领域技术人员应该清楚， 这 些描述都是示例性的， 并不是对本发明保护范围的限制。本领域技术人员可以根据本 发明的精神和原理对本发明做出各种变型和修改，这些变型和修改也在本发明的范围 内。

Claims

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1、 一种上行探测参考信号的发送功率控制方法， 用于多点协作 （CoMP ) 系统， 在 CoMP用户设备的下行发送点和上行接收点不同时， 所述方法包括：
采用用户专用的闭环功率控制初始值对向所述下行发送点发送的探测参考信号 的闭环功率控制值进行调整； 其中， 所述用户专用的闭环功率控制初始值根据获取的 所述下行发送点与上行接收点到所述 CoMP用户设备的路径损失之差确定；
利用所述闭环功率控制值、功率偏置值和开环功率控制值确定当前子帧向所述下 行发送点发送探测参考信号的功率控制值。
2、 根据权利要求 1所述的方法， 其中， 所述方法还包括：
接收所述 CoMP用户设备所属服务小区的基站发送的指令， 所述指令用于指示所 述 CoMP用户设备采用所述用户专用的闭环功率控制初始值对向所述下行发送点发送 探测参考信号的闭环功率控制值进行调整。
3、 根据权利要求 1所述的方法， 其中， 所述方法还包括：
根据确定的所述功率控制值和配置给所述 CoMP用户设备在所述当前子帧上发送 给服务小区的发送功率来确定所述 CoMP用户设备向所述下行发送点发送探测参考信 号的功率。
4、 根据权利要求 1所述的方法， 其中， 所述方法还包括： 获取所述下行发送点 与上行接收点到所述 CoMP用户设备的路径损失之差。
5、 根据权利要求 4所述的方法， 其中， 所述获取下行发送点与上行接收点到所 述 CoMP用户设备的路径损失之差， 包括：
接收所述 CoMP用户设备所属服务小区通知的所述下行发送点与所述上行接收点 到所述 CoMP用户设备的路径损失之差； 或者，
接收所述 CoMP 用户设备所属服务小区发送的确定所述路径损失之差的相关信 息； 所述相关信息包括： 所述下行发送点与上行接收点发送导频信号的发送功率值或 者所述下行发送点与上行接收点发送导频信号的发送功率值的差值、以及所述下行发 送点与上行接收点发送的导频信号到达所述 CoMP用户设备的接收功率的差值； 利用所述相关信息确定所述路径损失之差。
6、 根据权利要求 1所述的方法， 其中， 所述用户专用的闭环功率控制初始值为 向所述上行接收点发送探测参考信号的功率控制值中的闭环功率控制初始值与所述 路径损失之差的和； 或者，
所述用户专用的闭环功率控制初始值为所述路径损失之差。
7、 根据权利要求 1所述的方法， 其中， 所述方法还包括：
在所述 CoMP用户设备所属服务小区通知的用户专用的标称功率偏移发生变化、 或者在所述 CoMP用户设备接收到随机接入响应信号时， 重置所述闭环功率控制初始 值。
8、 一种上行探测参考信号的发送功率控制方法， 用于多点协作 （CoMP ) 系统， 在 CoMP用户设备的下行发送点和上行接收点不同时， 所述方法包括：
所述 CoMP用户设备所属的服务小区向所述 CoMP用户设备发送所述下行发送点与 所述上行接收点到所述 CoMP用户设备的路径损失之差， 所述路径损失之差用于供所 述用户设备确定用户专用的闭环功率控制初始值； 或者，
所述 CoMP用户设备所属的服务小区向所述 CoMP用户设备发送确定所述路径损失 之差的相关信息， 所述相关信息用于供所述用户设备确定所述路径损失之差， 并根据 所述路径损失之差确定用户专用的闭环功率控制初始值， 所述相关信息包括： 所述下 行发送点与上行接收点发送导频信号的发送功率值或者所述下行发送点与上行接收 点发送导频信号的发送功率值的差值、以及所述下行发送点与上行接收点发送的导频 信号到达所述 CoMP用户设备的接收功率的差值。
9、 根据权利要求 8所述的方法， 其中， 所述服务小区通过高层半静态无线资源 控制信令发送所述路径损失之差或者所述确定路径损失之差的相关信息。
10、 根据权利要求 8所述的方法， 其中， 所述 CoMP用户设备所属的服务小区向 所述 CoMP用户设备发送指令，所述指令用于指示所述 CoMP用户设备采用用户专用的 闭环功率控制初始值对向所述下行发送点发送探测参考信号的闭环功率控制值进行 调整； 或者，
所述指令用于指示所述 CoMP用户设备采用用户专用的闭环功率控制初始值还是 采用与上行数据信道相同的闭环功率控制初始值对向所述下行发送点发送探测参考 信号的闭环功率控制值进行调整。
11、 根据权利要求 8所述的方法， 其中， 在向所述 CoMP用户设备发送所述路径 损失之差之前， 所述方法还包括： 确定所述下行发送点与上行接收点到所述 CoMP用户设备的路径损失之差。
12、 根据权利要求 8所述的方法， 其中， 在向所述 CoMP用户设备发送确定所述 路径损失之差的相关参数之前， 所述方法还包括：
获取确定所述路径损失之差的相关信息。
13、 根据权利要求 8所述的方法， 其中， 所述方法还包括：
通知所述 CoMP用户设备用户专用的标称功率偏移； 或者，
根据接收到的所述 CoMP用户设备发送的随机接入前导向所述 CoMP用户设备发送 随机接入响应信号。
14、 根据权利要求 8所述的方法， 其中， 所述方法还包括：
所述网络侧半静态地重置所述路径损失之差或确定路径损失之差的相关参数。
15、 一种用户设备， 所述用户设备包括：
调整单元，所述调整单元被配置用于采用用户专用的闭环功率控制初始值对向所 述下行发送点发送的探测参考信号的闭环功率控制值进行调整； 其中， 所述用户专用 的闭环功率控制初始值根据获取的所述下行发送点与上行接收点到所述 CoMP用户设 备的路径损失之差确定；
第一处理单元， 所述第一处理单元被配置用于利用所述闭环功率控制值、功率偏 置值和开环功率控制值确定当前子帧向所述下行发送点发送探测参考信号的功率控 制值。
16、 根据权利要求 15所述的用户设备， 其中， 所述用户设备还包括： 第一接收单元， 所述第一接收单元被配置用于接收所述 CoMP用户设备所属服务 小区的基站发送的指令， 所述指令用于指示所述 CoMP用户设备采用所述用户专用的 闭环功率控制初始值对向所述下行发送点发送探测参考信号的闭环功率控制值进行 调整。
17、 根据权利要求 15所述的用户设备， 其中， 所述用户设备还包括： 第二处理单元，所述第二处理单元被配置用于根据确定的所述功率控制值和配置 给所述 CoMP用户设备在所述当前子帧上发送给服务小区的发送功率来确定所述 CoMP 用户设备向所述下行发送点发送探测参考信号的功率。
18、 根据权利要求 15所述的用户设备， 其中， 所述用户设备还包括： 第一获取单元，所述第一获取单元被配置用于获取所述下行发送点与上行接收点 到所述 CoMP用户设备的路径损失之差。
19、 根据权利要求 15所述的方法， 其中， 所述用户专用的闭环功率控制初始值 为向所述上行接收点发送探测参考信号的功率控制值中的闭环功率控制初始值与所 述路径损失之差的和； 或者， 所述用户专用的闭环功率控制初始值为所述路径损失之 差。
20、 根据权利要求 15所述的用户设备， 其中， 所述用户设备还包括： 第二接收单元， 被配置用于接收所述 CoMP用户设备所属服务小区通知的用户专 用的标称功率偏移； 或者接收所述服务小区根据所述 CoMP用户设备发送的随机接入 前导返回的随机接入响应信号；
第一重置单元， 所述第一重置单元被配置用于在所述 CoMP用户设备所属服务小 区通知的用户专用的标称功率偏移发生变化、 或者在所述 CoMP用户设备接收到随机 接入响应信号时， 重置所述闭环功率控制初始值。
21、 一种基站， 所述基站包括：
第一发送单元， 所述第一发送单元被配置用于向所述 CoMP用户设备发送所述下 行发送点与所述上行接收点到所述 CoMP用户设备的路径损失之差， 所述路径损失之 差用于供所述用户设备确定用户专用的闭环功率控制初始值。
22、 根据权利要求 21所述的基站， 其中， 所述基站还包括：
第三处理单元，所述第三处理单元被配置用于确定所述下行发送点与上行接收点 到所述 CoMP用户设备的路径损失之差。
23、 一种基站， 所述基站包括：
第二发送单元， 所述第二发送单元被配置用于向所述 CoMP用户设备发送确定所 述路径损失之差的相关信息，所述相关信息用于供所述用户设备确定所述路径损失之 差， 并根据所述路径损失之差确定用户专用的闭环功率控制初始值；
其中， 所述相关信息包括： 所述下行发送点与上行接收点发送导频信号的发送功 率值或者所述下行发送点与上行接收点发送导频信号的发送功率值的差值、以及所述 下行发送点与上行接收点发送的导频信号到达所述 CoMP 用户设备的接收功率的差 值。
24、 根据权利要求 23所述的基站， 其中， 所述基站还包括：
第四处理单元， 获取确定所述路径损失之差的相关信息。
25、 根据权利要求 21或 23所述的基站， 其中， 所述基站还包括：
第三发送单元， 所述第三发送单元被配置用于向所述 CoMP用户设备发送指令， 所述指令用于指示所述 CoMP用户设备采用用户专用的闭环功率控制初始值对向所述 下行发送点发送探测参考信号的闭环功率控制值进行调整； 或者，
所述指令用于指示所述 CoMP用户设备采用用户专用的闭环功率控制初始值还是 采用与上行数据信道相同的闭环功率控制初始值对向所述下行发送点发送探测参考 信号的闭环功率控制值进行调整。
26、 根据权利要求 21或 23所述的基站， 其中， 所述基站还包括：
第四发送单元， 所述第四发送单元被配置用于通知所述 CoMP用户设备用户专用 的标称功率偏移； 或者， 被配置用于根据接收到的所述 CoMP用户设备发送的随机接 入前导向所述 CoMP用户设备发送随机接入响应信号。
27、 根据权利要求 21或 23所述的基站， 其中， 所述基站还包括：
第二重置单元，所述第二重置单元被配置用于半静态地重置所述路径损失之差或 确定路径损失之差的相关参数。
28、 一种计算机可读程序， 其中当在 CoMP用户设备中执行所述程序时， 所述程 序使得计算机在所述 CoMP用户设备中执行如权利要求 1至 7的任一项权利要求所述 的上行探测参考信号的发送功率控制方法。
29、 一种存储有计算机可读程序的存储介质， 其中所述计算机可读程序使得计 算机在 CoMP用户设备中执行如权利要求 1至 7的任一项权利要求所述的上行探测参 考信号的发送功率控制方法。
30、 一种计算机可读程序， 其中当在基站中执行所述程序时， 所述程序使得计 算机在所述基站中执行如权利要求 8至 14的任一项权利要求所述的上行探测参考信 号的发送功率控制方法。
31、 一种存储有计算机可读程序的存储介质， 其中所述计算机可读程序使得计 算机在基站中执行如权利要求 8至 14的任一项权利要求所述的上行探测参考信号的 发送功率控制方法。
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