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WO2013078603A1 - Prach的发送功率的控制方法和装置 - Google Patents

Prach的发送功率的控制方法和装置 Download PDF

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Publication number
WO2013078603A1
WO2013078603A1 PCT/CN2011/083100 CN2011083100W WO2013078603A1 WO 2013078603 A1 WO2013078603 A1 WO 2013078603A1 CN 2011083100 W CN2011083100 W CN 2011083100W WO 2013078603 A1 WO2013078603 A1 WO 2013078603A1
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WIPO (PCT)
Prior art keywords
receiving point
comp
prach
target receiving
target
Prior art date
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Ceased
Application number
PCT/CN2011/083100
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English (en)
French (fr)
Inventor
徐月巧
徐海博
周华
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Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to PCT/CN2011/083100 priority Critical patent/WO2013078603A1/zh
Priority to CN201180074525.4A priority patent/CN104025671A/zh
Publication of WO2013078603A1 publication Critical patent/WO2013078603A1/zh
Priority to US14/289,176 priority patent/US20140269579A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/04—Transmission power control [TPC]
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—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]
    • H04W52/18—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
    • H04W52/247—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter sent by another terminal
    • 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]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • 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]
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for controlling transmission power of a physical random access channel (PRACH) in a Coordinated Multi-Point Transmission/Reception (CoMP) scenario.
  • PRACH physical random access channel
  • CoMP Coordinated Multi-Point Transmission/Reception
  • LTE-Advanced LTE-Advanced
  • CoMP Coordinated Multi-point Transmission
  • the cooperative transmission scenario uses the geographically adjacent transmission points to cooperatively transmit signals to the user, especially for the cell edge users, which can improve the signal quality and expand the coverage.
  • UL/DL CoMP uplink and downlink CoMP
  • CoMP homogenous network with intra-site CoMP
  • a homogeneous network with a high transmit power wireless remote head RRH
  • a heterogeneous network scenario with different cell IDs for macro cell range distribution low power RRH RRH
  • a semi-static or dynamic receiving point change can be configured for a CoMP user (User Equipment, UE).
  • a single point of receiving point (RP) including eNB or RRH
  • RP receiving point
  • eNB eNB
  • RRH target receiving point
  • Uplink synchronization ensures that all users in the RRH1 coverage reach the RRH1 at the same time, so that there is no interference between the uplink signals arriving by the users on the RRH1 to ensure the reception performance of the CoMP users.
  • the inventor finds that in order to establish uplink synchronization with the target receiving point, that is, the CoMP UE in FIG. 1 needs to establish uplink synchronization with RRH1, and the user needs to have an appropriate timing advance (Timing Advance, TA). Send an upstream signal.
  • Timing Advance Timing Advance
  • TA Timing Advance
  • how to obtain the TA value is not defined. If the TA value between the user and the target receiving point is obtained by using the PRACH as defined in the LTE standard or the LTE-Advaced standard, Then because the PRACH is sent to the target receiving point There is a problem with the control of the transmission power, and the expected effect cannot be obtained.
  • the purpose of the embodiments of the present invention is to provide a method and a device for controlling the transmission power of the PRACH when the user accesses the target receiving point in the uplink CoMP scenario, so as to ensure that the user accesses the target cell with the correct transmission power.
  • a method for controlling transmission power of a physical random access channel includes:
  • the original receiving point sends the relevant parameters of the target receiving point receiving the PRACH to the user equipment (CoMP UE) in the coordinated multipoint transmission system;
  • the original receiving point sends an index of the path loss value between the CoMP UE and the target receiving point to the CoMP UE, so that the CoMP UE determines the PRACH according to the target receiving power and the path loss value in the relevant parameters of the target receiving point receiving the PRACH. Transmit power.
  • a method for controlling transmission power of a PRACH includes:
  • the CoMP UE acquires the relevant parameters of the PRACH received by the target receiving point from the original receiving point;
  • the CoMP UE determines the path loss value between the target and the receiving point according to the index of the path loss value sent by the original receiving point;
  • the CoMP UE determines the transmission power of the PRACH according to the target received power in the relevant parameters of the PRACH received by the target receiving point and the path loss value.
  • an uplink synchronization method of a CoMP UE and a target receiving point includes:
  • the CoMP UE determines the transmit power of the PRACH of the CoMP UE to the target receiving point;
  • the CoMP UE transmits a PRACH to the target receiving point according to the determined transmit power of the PRACH; the CoMP UE performs uplink synchronization with the target receiving point according to the timing advance (TA) of the target receiving point feedback.
  • TA timing advance
  • a base station in a CoMP transmission system includes:
  • a first sending unit which sends a related parameter of the target receiving point to receive the PRACH to the CoMP UE; the second sending unit sends an index of the path loss value between the CoMP UE and the target receiving point to the CoMP UE, so that the CoMP UE is configured according to the CoMP UE.
  • the target receiving point receives the target received power and the path loss value in the relevant parameters of the PRACH to determine the transmit power of the PRACH.
  • a UE in a CoMP transmission system where the UE includes:
  • An acquiring unit which acquires, from the original receiving point, a related parameter that the target receiving point receives the PRACH;
  • a first determining unit configured to determine a path loss value between the target receiving point and the target receiving point according to an index of the path loss value sent by the original receiving point
  • a second determining unit that determines a transmission power of the PRACH according to the target reception power in the correlation parameter of the PRACH received by the target reception point and the path loss value.
  • a UE in a CoMP transmission system where the UE includes:
  • a determining unit that determines a transmit power of a PRACH of the CoMP UE to the target receiving point
  • a sending unit configured to send a PRACH to the target receiving point according to the determined transmit power of the PRACH; and a synchronization unit that performs uplink synchronization with the target receiving point according to the TA fed back by the target receiving point.
  • a computer readable program is provided, wherein, when the program is executed in a base station, the program causes a computer to perform a control method of a transmission power of the PRACH described above in the base station.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a control method of a transmission power of a PRACH described above in a base station.
  • a computer readable program wherein, when the program is executed in a user equipment, the program causes a computer to execute the foregoing method for controlling transmission power of a PRACH in the user equipment Or performing the foregoing uplink synchronization method of the CoMP UE and the target receiving point.
  • a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a control method of a transmission power of a PRACH described above in a user equipment, or performs the foregoing
  • the uplink synchronization method of the CoMP UE and the target receiving point The beneficial effects of the embodiments of the present invention are as follows:
  • the power control method and device for transmitting PRACH according to the embodiment of the present invention the CoMP UE can send the PRACH to the target receiving point with the correct transmit power, and obtain the TA between the CoMP UE and the target receiving point.
  • the value is established, and the uplink synchronization with the target receiving point is established, and then the target cell is accessed.
  • FIG. 1 is a schematic diagram of changes in an uplink receiving point of a CoMP UE
  • FIG. 2 is a flowchart of a method for controlling transmission power of a PRACH according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for controlling transmission power of a PRACH according to another embodiment of the present invention
  • FIG. 4 is a flowchart of a method for uplink synchronization of a CoMP UE and a target receiving point according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram showing the composition of a user equipment in a CoMP transmission system according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram showing the composition of a user equipment in a CoMP transmission system according to another embodiment of the present invention.
  • the embodiment of the present invention configures a single-point receiving scenario in which a semi-static or dynamic RP point changes are configured in an uplink CoMP scenario of the LTE-A system.
  • the user is required to send the PRACH to the target receiving point to obtain the TA value to establish the uplink synchronization with the target receiving point.
  • the embodiment of the present invention is not limited to the foregoing scenario, and is applicable to other scenarios involving the sending of the PRACH.
  • the user refers to the CoMP UE, that is, the user equipment in the CoMP transmission system.
  • the original receiving point and the target receiving point refer to the base station serving the user in the CoMP transmission system, where the base station is located. It can be a macro base station (such as an eNB) or a micro base station (such as an RRH).
  • the current method for obtaining uplink synchronization in the LTE standard is that the user is in the physical random access channel.
  • PRACH Physical Random Access Channel
  • RACH Preamble a random access preamble
  • Pcell Primary Cell
  • Scell Secondary Cell
  • CA Carrier Aggregation
  • the CoMP user sends the PRACH to the target receiving point to obtain a new uplink synchronization with the TA value of the target receiving point, according to LTE.
  • the uplink power control expression for sending PRACH is:
  • P PRACH min ⁇ P CMAXc (0, PREAMBLE _ RECEIVED _ TARGET _ POWER + PL c ⁇ _[dBm]
  • AMA X . « is the user defined in TS36.101 for the service at subframe i.
  • the maximum rated transmit power of cell c, PL £ is the path loss value of the user to the serving cell c, and the parameter " PREAMBLE_RECEIVED_TARGET_POWER " is a broadcast system message indicating the target received power value of the transmitted pilot, that is, the expected received power.
  • the parameter "PREAMBLE_RECEIVED_TARGET_POWER" in the above formula is a system message broadcast by the eNB to all users in its coverage, indicating the power value of the expected receiving user transmitting the PRACH of the eNB cell, and when the receiving point changes, The parameter should indicate the received PRACH power value of the target cell that the user desires to access at this time.
  • ⁇ in the above formula should indicate For the path loss value of the user and the target cell, the path loss of the user in the uplink CoMP and the target receiving point is compensated, and not the path loss value of the user and the eNB.
  • the embodiment of the invention provides a method for controlling the transmission power of the PRACH.
  • Figure 2 is a flow chart of the method. Referring to Figure 2, the method includes:
  • Step 201 The original receiving point sends the relevant parameter of the target receiving point to receive the PRACH to the user equipment (CoMP UE) in the coordinated multipoint transmission system;
  • a target interaction between the target receiving point and the original receiving point may be performed by a backhaul (backhaul line) such as a fiber connection, and a set of parameters of the related PRACH, such as a target received power of the received PRACH (PREAMBLE_RECEIVED_TARGET_POWER), power The power stepping (power Ramping Step), the maximum number of retransmissions of the PRACH sent, etc., tell the original receiving point.
  • the original receiving point then sends the relevant parameters of the PRACH received by the target receiving point to the CoMP user.
  • the original receiving point may notify the CoMP user of the relevant parameters of the target receiving point receiving the PRACH through UE-specific (User-Specific) dedicated RRC (Radio Resource Control) signaling, but This embodiment is not intended to be limiting. Therefore, the CoMP user can obtain the PREAMBLE_RECEIVED_TARGET_POWER value related to the target receiving point and the corresponding PRACH sending parameter through the RRC signaling sent by the original receiving point.
  • UE-specific User-Specific
  • RRC Radio Resource Control
  • the CoMP user can obtain the target received power of the target receiving point to receive the PRACH.
  • Step 202 The original receiving point sends an index of the path loss value between the CoMP UE and the target receiving point to the CoMP UE, so that the CoMP UE receives the PRACH related parameter according to the target receiving point.
  • the target received power and the path loss value determine the transmit power of the PRACH.
  • the eNB allocates multiple CSI-RS (Channel State Information-Reference Signal) resources to the CoMP UE, and each CSI-RS resource is associated with one possible uplink receiving point (RRH or eNB). ), thereby being used by the CoMP UE to measure its path loss value to each possible upstream reception point.
  • the eNB when configuring multiple CSI-RS resources for the CoMP UE, also informs the user of the index value corresponding to each CSI-RS resource, that is, establishes a resource index table, which is known by both the eNB and the user.
  • Each index value is associated with a unique CSI-RS resource, so that the path loss value of the uplink receiving point corresponding to the CSI-RS resource can be obtained.
  • the user needs to adopt a target receiving point (RRH) in the power control of transmitting the PRACH.
  • the path loss value that is, only the eNB needs to send the index value (ie, the index of the path loss value) of the CSI-RS resource corresponding to the RRH to the user.
  • the original receiving point may pass the downlink control information of the Physical Downlink Control Channel (PDCCH) command, for example, DCI (Downlink Control Information) format 1A (Format 1A), and the CoMP UE and the target receiving point.
  • the index of the path loss value is sent to the CoMP UE, and the index of the path loss value between the CoMP UE and the target receiving point may also be sent to the CoMP UE through the user-specific radio resource control signaling.
  • DCI format 1A carrying the physical downlink control channel command (PDCCH order) is used to transmit the index of the path loss value between the CoMP UE and the target receiving point to the CoMP UE
  • DCI format 1A carrying the physical downlink control channel command (PDCCH order)
  • the original receiving point triggers the user to send the PRACH by using the PDCCH order
  • the 3 bits used for the carrier indication in the carrier aggregation (CA) are reused.
  • Signaling, ⁇ "Carrier indicator - 0 or 3 bits" to indicate the path loss value index, for example, the index of the path loss value (PL, Path Loss) of the CoMP user to the target receiving point can be indicated by "CoMP index indicator" ( Index).
  • the present embodiment may also represent the above 3-bit by the 1-bit information "flag" in the DCI format 1A.
  • the content of the signaling indication is "Carrier indicator” in carrier aggregation or "CoMP index indicator” in CoMP.
  • the above 3-bit signaling is used for carrier indication by "flag: 0", that is, the above The 3 bit signaling belongs to the "carrier indicator” in the carrier aggregation; the above-mentioned 3-bit signaling is used to indicate the path loss value index by "flag:l”, that is, the above 3-bit signaling belongs to the "CoMP index indicator” in the CoMP.
  • the original receiving point also triggers the user to send the PRACH through the PDCCH order
  • a parameter "CoMP index indicator” is defined by using the remaining redundant bits to indicate The index of the path loss value PL between the CoMP user and the target receiving point. For example, use 3bit redundant bits to define the parameter "CoMP index indicator ⁇
  • the original receiving point for example, the eNB may indicate CoMP by sending a dedicated UE-specific RRC parameter.
  • the user sends the index of the path loss value PL used in the PRACH.
  • the original receiving point may send an index of the path loss value between the CoMP UE and the target receiving point to the CoMP UE.
  • the original receiving point sends the relevant parameter of the target receiving point to receive the PRACH and the index of the path loss value between the CoMP user and the target receiving point to the CoMP user, and the CoMP user can receive the target according to the target in the relevant parameter.
  • the power and the path loss value corresponding to the index are used to determine the transmit power of the PRACH by using the power control expression, and the determined PRACH transmit power is sent to the target receiving point.
  • the CoMP user can further adjust the transmission power of the transmitting PRACH according to parameters such as the power enhancement step size and the maximum number of retransmissions in the above related parameters.
  • the target receiving point After receiving the PRACH sent by the CoMP user, the target receiving point can feed back the corresponding TA value to the CoMP user, and the CoMP user can determine how much TA value to send the data to the target receiving point, thereby the CoMP user can receive the target. Point synchronization, and access to the cell under the jurisdiction of the target receiving point.
  • the CoMP UE can send the PRACH to the target receiving point with the correct transmit power, obtain the TA value between the CoMP UE and the target receiving point, establish uplink synchronization with the target receiving point, and then access the Target cell.
  • Embodiment 2 the same contents as in Embodiment 1 are incorporated in Embodiment 2.
  • the embodiment of the invention further provides a method for controlling the transmission power of the PRACH.
  • Figure 3 is a flow chart of the method. Referring to Figure 3, the method includes:
  • Step 301 The CoMP UE obtains the relevant parameters of the PRACH received by the target receiving point from the original receiving point.
  • the step 301 corresponds to the step 201 of the first embodiment.
  • the original receiving point interacts with the target receiving point to receive the relevant parameters of the PRACH.
  • the CoMP user can be notified by the UE-specific dedicated RRC signaling to receive the relevant parameters of the PRACH by the target receiving point, and details are not described herein again.
  • Step 302 The CoMP UE determines a path loss value between the target receiving point according to an index of the path loss value sent by the original receiving point.
  • Step 302 corresponds to step 202 of Embodiment 1, and the original receiving point may indicate CoMP user and target receiving by using DCI format 1A of PDCCH order (reusing signaling for carrier indication in CA or using remaining redundant bits)
  • the index of the path loss value between the points can also be passed through the dedicated UE-specific RRC
  • the parameter indicates the index of the path loss value between the CoMP user and the target receiving point, and details are not described herein again.
  • the CoMP user can determine the path loss value between it and the target receiving point.
  • Step 303 The CoMP UE determines the transmit power of the PRACH according to the target received power in the relevant parameters of the PRACH received by the target receiving point and the path loss value.
  • the CoMP user obtains the target receiving power of the target receiving point and the path loss value of the CoMP user to the target receiving point through steps 301 and 302, respectively, and then uses the two parameters to determine the transmit power of the PRACH, for example,
  • the parameter obtained in step 301 is taken as "PREAMBLE_RECEIVED_TARGET_POWER” in the above power control expression
  • the parameter obtained in step 302 is taken as "PL c " in the above power control expression.
  • the CoMP user may also use the target receiving point to receive other parameters of the PRACH, adjust the transmission power, or adjust the transmission of the PRACH.
  • the CoMP UE can send the PRACH to the target receiving point with the correct transmit power, obtain the TA value between the CoMP UE and the target receiving point, establish uplink synchronization with the target receiving point, and then access the Target cell.
  • the embodiment of the invention further provides an uplink synchronization method between a CoMP UE and a target receiving point.
  • Figure 4 is a flow chart of the method. Referring to Figure 4, the method includes:
  • Step 401 The CoMP UE determines the transmit power of the PRACH of the CoMP UE to the target receiving point.
  • the method of the third embodiment is implemented by the method of Embodiment 3, and the content of Embodiment 3 is incorporated herein, and details are not described herein again.
  • Step 402 The CoMP UE sends the determined PRACH transmission power to the target receiving point.
  • Step 403 The CoMP UE performs uplink synchronization with the target receiving point according to the timing advance (TA) of the target receiving point feedback.
  • TA timing advance
  • the CoMP UE obtains the TA to the target receiving point by sending the PRACH to the target receiving point, that is, the TA value can be used to send data to the target receiving point, thereby establishing synchronization with the target receiving point.
  • the CoMP UE can send the PRACH to the target receiving point with the correct transmit power, obtain the TA value between the CoMP UE and the target receiving point, establish uplink synchronization with the target receiving point, and then access the Target cell.
  • An embodiment of the present invention further provides a base station, as described in Embodiment 4 below. Because the base station solves the problem The principle is similar to the method for controlling the transmission power of the PRACH in the foregoing Embodiment 1. Therefore, the implementation of the base station can be referred to the implementation of the method in Embodiment 1, and the repeated description is omitted.
  • FIG. 5 is a schematic diagram of the composition of the base station.
  • the base station includes:
  • a first sending unit 501 which sends a related parameter of the target receiving point to receive the PRACH to the CoMP UE.
  • the second sending unit 502 sends an index of the path loss value between the CoMP UE and the target receiving point to the CoMP UE, so that the CoMP
  • the UE determines the transmit power of the PRACH according to the target received power and the path loss value in the relevant parameters of the target receiving point receiving the PRACH.
  • the base station further includes:
  • the interaction unit 503 performs signaling interaction with the target receiving point to obtain a related parameter that the target receiving point receives the PRACH.
  • the related parameters include a target receiving power, a power enhancement step, and a maximum number of retransmissions.
  • the first sending unit 501 is specifically configured to send, by using user-specific radio resource control signaling, a related parameter that the target receiving point receives the PRACH to the CoMP UE.
  • the second sending unit 502 is specifically configured to: send, by using a DCI format 1A that carries a PDCCH order, an index of a path loss value between the CoMP UE and the target receiving point to the CoMP UE; or The resource control signaling sends an index of the path loss value between the CoMP UE and the target receiving point to the CoMP UE.
  • the second sending unit 502 uses the signaling for performing the carrier indication in the DCI format 1A to indicate the index of the path loss value, and passes the 1 bit in the DCI format 1A.
  • the information distinguishes the content indicated by the signaling to send an index of the path loss value to the CoMP UE.
  • the second sending unit 502 indicates the index of the path loss value by using a redundant bit in the DCI format 1A to send the index of the path loss value to the CoMP UE.
  • the base station may be a macro base station in the CoMP transmission system, or may be a micro base station in the CoMP transmission system, as long as the receiving point of the uplink single point reception of the CoMP UE is included in the protection scope of the present invention.
  • the CoMP UE can send the PRACH to the target receiving point with the correct transmission power, obtain the TA value between the CoMP UE and the target receiving point, establish uplink synchronization with the target receiving point, and then access the Target cell.
  • An embodiment of the present invention further provides a user equipment, as described in Embodiment 5 below.
  • the implementation of the user equipment is similar to the method for controlling the transmission power of the PRACH in the foregoing embodiment 2. Therefore, the implementation of the user equipment may refer to the implementation of the method in Embodiment 2.
  • FIG. 6 is a schematic diagram of the composition of the UE.
  • the UE includes:
  • the obtaining unit 601 is configured to obtain, from the original receiving point, a related parameter that the target receiving point receives the PRACH, where the relevant parameters of the target receiving point receiving the PRACH include a target receiving power of the target receiving point receiving the PRACH, a power enhancement step size, and a maximum retransmission. The number of times.
  • a first determining unit 602 which determines a path loss value between the target receiving point and an index based on an index of the path loss value sent by the original receiving point;
  • the second determining unit 603 determines the transmission power of the PRACH according to the target receiving power and the path loss value in the relevant parameters of the PRACH received by the target receiving point.
  • the UE of the present embodiment obtains the target receiving power of the target receiving point and the path loss value of the CoMP user to the target receiving point through the obtaining unit 601 and the first determining unit 602, respectively, and then passes the second determining unit. 603.
  • Determine the transmit power of the PRACH by using the two parameters, for example, using the foregoing power control expression, using the parameter obtained by the obtaining unit 601 as the parameter that the PREAPBLE_RECEIVED_TARGET_POWER will pass through the first determining unit 602 in the power control expression.
  • the UE may also use the target receiving point to receive other parameters of the PRACH, adjust the transmission power, or adjust the transmission of the PRACH.
  • the UE in the embodiment of the present invention can send the PRACH to the target receiving point with the correct transmit power, obtain the TA value between the UE and the target receiving point, establish uplink synchronization with the target receiving point, and further access the target cell. .
  • An embodiment of the present invention further provides a user equipment, as described in Embodiment 6 below.
  • the method for solving the problem is similar to the method for the uplink synchronization of the CoMP UE and the target receiving point in the foregoing Embodiment 3. Therefore, the implementation of the user equipment can be implemented by referring to the method in Embodiment 3, and the repeated description is omitted.
  • FIG. 7 is a schematic diagram of the composition of the UE.
  • the UE includes: a determining unit 701, which determines a transmit power of the PRACH of the CoMP UE to the target receiving point, and a sending unit 702, which sends a PRACH to the target receiving point according to the determined transmit power of the PRACH;
  • the synchronization unit 703 performs uplink synchronization with the target receiving point according to the TA of the target receiving point feedback.
  • the determining unit 701 includes:
  • the obtaining module 7011 is configured to obtain, from the original receiving point, the related parameter that the target receiving point receives the PRACH; the first determining module 7012 determines the path loss value between the target receiving point and the target receiving point according to the index of the path loss value sent by the original receiving point;
  • the second determining module 7013 determines the transmission power of the PRACH according to the target receiving power and the path loss value in the relevant parameters of the PRACH received by the target receiving point.
  • the function of the component of the determining unit 701 can be implemented by using the composition of the UE in Embodiment 5, and details are not described herein again.
  • the UE in the embodiment of the present invention can send the PRACH to the target receiving point with the correct transmit power, obtain the TA value between the UE and the target receiving point, establish uplink synchronization with the target receiving point, and further access the target cell. .
  • 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 execute the control method of the transmission power of the PRACH described in Embodiment 1 in the base station.
  • 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 control method of the transmission power of the PRACH described in Embodiment 1 in the base station.
  • the embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a user equipment, the program causes the computer to execute the control method of the transmit power of the PRACH described in Embodiment 2 in the user equipment or The uplink synchronization method of the CoMP UE and the target receiving point described in Embodiment 3.
  • 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 control method of the transmit power of the PRACH described in Embodiment 2 in the user equipment or the third embodiment The uplink synchronization method of the CoMP UE and the target receiving point.
  • 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.
  • Logic components such as field programmable logic components, microprocessors, processors used in computers, and the like.
  • the invention also relates to A storage medium for storing the above programs, such as a hard disk, a magnetic disk, a compact disk, a DVD, a flash memory, or the like.

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Abstract

本发明实施例提供了一种物理随机接入信道（PRACH）的发送功率的控制方法和装置，所述方法包括：原接收点接收目标接收点发送的接收PRACH的相关参数；原接收点将所述目标接收点接收PRACH的相关参数发送给协作多点传输系统中的用户设备（CoMP UE）；原接收点将CoMP UE与目标接收点之间的路损值的索引发送给CoMP UE，以便CoMP UE根据所述目标接收点接收PRACH的相关参数中的目标接收功率和所述路损值确定PRACH的发送功率。通过本发明实施例的发送PRACH的功率控制方法和装置，CoMP UE可以以正确的发送功率发送PRACH到目标接收点，获得CoMP UE与目标接收点之间的TA值，建立与目标接收点的上行同步，进而接入到该目标小区。

Description

PRACH的发送功率的控制方法和装置 技术领域
本发明涉及通信领域， 尤其涉及一种协作多点传输 （Coordinated Multi-point Transmission/Reception, CoMP)场景下的物理随机接入信道（Physical Random Access Channel, PRACH) 的发送功率的控制方法和装置。 背景技术
在 LTE- Advanced ( LTE-A ) 系统中， 协作多点传输 ( Coordinated Multi-point Transmission, CoMP) 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，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) 定义了四种场景：
a)同构网络的站址间 CoMP (homogenous network with intra-site CoMP);
b)具有高发送功率无线远端单元 （Remote Radio Head, RRH) 的同构网络； c)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；
d)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， 对于上行 CoMP定义了两种场景： 多点联合接收 （Joint Reception, JR) 和单点接收 （Single Point Reception )。 单点接收的场景下， 可以给 CoMP用户 （User Equipment, UE) 配置半静态或动态的接收点变化。 当单点接收点 （Reception Point, RP) (包括 eNB或 RRH) 发生变化时， 例如， 图 1中 CoMP用户的上行单点接收点 从 eNB转变为 RRH1，UE需要建立跟目标接收点也即 RRH1的上行同步，保证 RRH1 覆盖范围内的所有用户上行信号同时到达 RRH1端，从而 RRH1端各个用户到达的上 行信号之间不存在干扰， 以保证 CoMP用户的接收性能。
发明人在实现本发明的过程中发现， 为建立与目标接收点的上行同步， 即图 1 中 CoMP UE需建立与 RRH1的上行同步， 该用户需要以适当的时间提前量 （Timing Advance, TA)发送上行信号。 然而， 目前在上行 CoMP单点接收的场景下， 并未定 义如何获得该 TA值， 如果采用 LTE标准或者 LTE-Advaced标准中定义的通过发送 PRACH来获得用户与目标接收点之间的 TA值， 则由于发送 PRACH到目标接收点 的发送功率的控制存在问题， 并不能得到预期的效果。
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 CoMP场景下用户接入目标接收点的时 候， PRACH的发送功率的控制方法和装置， 以保证用户以正确的发送功率接入到目 标小区。
根据本发明实施例的一个方面， 提供了一种物理随机接入信道 （PRACH) 的发 送功率的控制方法， 其中， 所述方法包括：
原接收点将目标接收点接收 PRACH的相关参数发送给协作多点传输系统中的用 户设备 （CoMP UE);
原接收点将 CoMP UE与目标接收点之间的路损值的索引发送给 CoMP UE,以便 CoMP UE根据所述目标接收点接收 PRACH的相关参数中的目标接收功率和所述路 损值确定 PRACH的发送功率。
根据本发明实施例的另一个方面， 提供了一种 PRACH的发送功率的控制方法， 其中， 所述方法包括：
CoMP UE从原接收点获取目标接收点接收 PRACH的相关参数；
CoMP UE根据原接收点发送的路损值的索引确定与目标接收点之间的路损值；
CoMP UE根据所述目标接收点接收 PRACH的相关参数中的目标接收功率和所 述路损值确定 PRACH的发送功率。
根据本发明实施例的再一个方面， 提供了一种 CoMP UE与目标接收点的上行同 步方法， 其中， 所述方法包括：
CoMP UE确定 CoMP UE到目标接收点的 PRACH的发送功率；
CoMP UE根据确定的 PRACH的发送功率向所述目标接收点发送 PRACH; CoMP UE根据目标接收点反馈的时间提前量 （TA) 进行与所述目标接收点的上 行同步。
根据本发明实施例的一个方面， 提供了一种 CoMP传输系统中的基站， 其中， 所 述基站包括：
第一发送单元， 其将目标接收点接收 PRACH的相关参数发送给 CoMP UE; 第二发送单元， 其将 CoMP UE与目标接收点之间的路损值的索引发送给 CoMP UE, 以便 CoMP UE根据所述目标接收点接收 PRACH的相关参数中的目标接收功率 和所述路损值确定 PRACH的发送功率。
根据本发明实施例的另一个方面， 提供了一种 CoMP传输系统中的 UE， 其中， 所述 UE包括：
获取单元， 其从原接收点获取目标接收点接收 PRACH的相关参数；
第一确定单元，其根据原接收点发送的路损值的索引确定与目标接收点之间的路 损值；
第二确定单元，其根据所述目标接收点接收 PRACH的相关参数中的目标接收功 率和所述路损值确定 PRACH的发送功率。
根据本发明实施例的再一个方面， 提供了一种 CoMP传输系统中的 UE， 其中， 所述 UE包括：
确定单元， 其确定 CoMP UE到目标接收点的 PRACH的发送功率；
发送单元， 其根据确定的 PRACH的发送功率向所述目标接收点发送 PRACH; 同步单元， 其根据目标接收点反馈的 TA进行与所述目标接收点的上行同步。 根据本发明实施例的一个方面， 提供了一种计算机可读程序， 其中， 当在基站中 执行该程序时，该程序使得计算机在所述基站中执行前述的 PRACH的发送功率的控 制方法。
根据本发明实施例的一个方面， 提供了一种存储有计算机可读程序的存储介质， 其中，该计算机可读程序使得计算机在基站中执行前述的 PRACH的发送功率的控制 方法。
根据本发明实施例的一个方面， 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所述用户设备中执行前述的 PRACH的发送 功率的控制方法， 或者执行前述的 CoMP UE与目标接收点的上行同步方法。
根据本发明实施例的一个方面， 提供了一种存储有计算机可读程序的存储介质， 其中，该计算机可读程序使得计算机在用户设备中执行前述的 PRACH的发送功率的 控制方法， 或者执行前述的 CoMP UE与目标接收点的上行同步方法。 本发明实施例的有益效果在于：通过本发明实施例的发送 PRACH的功率控制方 法和装置， CoMP UE可以以正确的发送功率发送 PRACH到目标接收点，获得 CoMP UE与目标接收点之间的 TA值， 建立与目标接收点的上行同步， 进而接入到该目标 小区。
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
参照以下的附图可以更好地理解本发明的很多方面。附图中的部件不是成比例绘 制的， 而只是为了示出本发明的原理。 为了便于示出和描述本发明的一些部分， 附图 中对应部分可能被放大或縮小。在本发明的一个附图或一种实施方式中描述的元素和 特征可以与一个或更多个其它附图或实施方式中示出的元素和特征相结合。此外，在 附图中，类似的标号表示几个附图中对应的部件， 并可用于指示多于一种实施方式中 使用的对应部件。 在附图中：
图 1是 CoMP UE的上行接收点发生变化示意图；
图 2是本发明实施例的 PRACH的发送功率的控制方法的流程图；
图 3是本发明另一实施例的 PRACH的发送功率的控制方法的流程图； 图 4是本发明实施例的 CoMP UE与目标接收点的上行同步方法的流程图； 图 5是本发明实施例的 CoMP传输系统中的基站的组成示意图；
图 6是本发明实施例的 CoMP传输系统中的用户设备的组成示意图；
图 7是本发明另一实施例的 CoMP传输系统中的用户设备的组成示意图。 具体实施方式 参照附图， 通过下面的说明书， 本发明实施例的前述以及其它特征将变得明显。 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 LTE-A系统的上行 CoMP 场景中， 用户配置了半静态或动态 RP点变化的单点接收场景为例， 并以用户向目标 接收点发送 PRACH获得 TA值建立与目标接收点的上行同步为前提， 但可以理解， 本发明实施例并不限于上述场景， 对于涉及发送 PRACH的其他场景均适用。
在以下的说明中， 除特殊说明外， 用户是指 CoMP UE, 也即 CoMP传输系统中 的用户设备， 原接收点和目标接收点是指 CoMP传输系统中为用户提供服务的基站， 这里的基站可以是宏基站 （如 eNB )， 也可以是微基站 （如 RRH)。
当前 LTE 标准中获得 TA 建立上行同步的方法是用户在物理随机接入信道中
(Physical Random Access Channel, PRACH)发送随机接入前导 （RACH Preamble )。 另夕卜， 在 LTE-Advaced标准化过程中， 对于载波聚合 （Carrier Aggregation, CA) 场 景下用户的上行接收点从 Pcell (Primary cell)变为 Scell ( Secondary cell) 时， 也定 义了用户通过发送 PRACH给 Scell获得用户与 Scell之间的 TA值， 以建立与 Scell 的上行同步。在上行 CoMP单点接收的场景下， 如果采用类似的方法， 当接收点发生 变化时， CoMP用户发送 PRACH给目标接收点， 以获得与目标接收点的 TA值建立 新的上行同步， 则根据 LTE R10, 发送 PRACH的上行功控表达式为：
PPRACH = min { PCMAXc (0, PREAMBLE _ RECEIVED _ TARGET _ POWER + PLc } _[dBm] 其中， AMAX,。«是 TS36.101 中定义的给用户配置在子帧 i时刻用于服务小区 c 的最大额定发送功率， PL£是用户到该服务小区 c 的路损值， 参数 " PREAMBLE_RECEIVED_TARGET_POWER "是广播的系统消息， 表示发送导频 的目标接收功率值， 也即期望的接收功率。
然而， 在上行 CoMP单点接收的场景下， 如果给用户配置了通过发送 PRACH建 立新的与目标接收点的上行同步， 并利用上述上行功控表达式确定 PRACH的发送功 率， 则原先 LTE R10 中 PRACH 的功控存在问题。 一方面， 上述公式中的参数 " PREAMBLE_RECEIVED_TARGET_POWER "是 eNB向其覆盖范围内的所有用户 广播的系统消息， 表示的是 eNB小区的期望接收用户发送 PRACH的功率值， 而当 接收点发生变化时， 该参数应该表示的是该用户此时期望接入的目标小区的接收 PRACH 功率值， 很显然， 这两个值是不同的； 另一方面， 上述公式中 ^ 应该表示 为用户与目标小区的路损值，补偿上行 CoMP中用户与目标接收点的路损，而并非用 户与 eNB的路损值。
基于此， 提出了本发明实施例的 PRACH的发送功率的控制方法和装置。
实施例 1
本发明实施例提供了一种 PRACH的发送功率的控制方法。图 2为该方法的流程 图， 请参照图 2， 该方法包括：
步骤 201 : 原接收点将目标接收点接收 PRACH的相关参数发送给协作多点传输 系统中的用户设备 （CoMP UE);
在步骤 201中， 目标接收点与原接收点之间可以通过 backhaul (回程线路）如光 纤连接等进行信令交互， 将相关 PRACH的一套参数， 如接收 PRACH的目标接收功 率 （PREAMBLE_RECEIVED_TARGET_POWER)， 功率增强步长 （power Ramping Step),发送 PRACH的最大重传次数等告诉原接收点。原接收点再将目标接收点接收 PRACH的相关参数发送给 CoMP用户。
在步骤 201的一个实施例中， 原接收点可以通过 UE-specific (用户专用）的专用 RRC (Radio Resource Control, 无线资源控制） 信令， 将目标接收点接收 PRACH的 相关参数告诉 CoMP用户， 但本实施例并不以此作为限制。 由此， CoMP用户通过原 接 收 点 发 送 的 RRC 信 令 ， 可 获 得 与 目 标 接 收 点 相 关 的 PREAMBLE_RECEIVED_TARGET_POWER值以及相应发送 PRACH的参数。
通过步骤 201， CoMP用户可以获得目标接收点接收 PRACH的目标接收功率。 步骤 202: 原接收点将所述 CoMP UE与所述目标接收点之间的路损值的索引发 送给所述 CoMP UE, 以便所述 CoMP UE根据所述目标接收点接收 PRACH的相关参 数中的目标接收功率和所述路损值确定 PRACH的发送功率。
在步骤 202中， eNB给 CoMP UE配置多个 CSI-RS (Channel State Information- Reference Signal, 信道状态信息 -导频信号） 资源， 每个 CSI-RS资源关联一个可能的 上行接收点 （RRH或 eNB)， 从而用于 CoMP UE测量其到每个可能的上行接收点的 路损值。 eNB在给 CoMP UE配置多个 CSI-RS资源的同时， 也告诉用户每个 CSI-RS 资源对应的索引值， 即建立一张资源索引表， eNB和用户双方已知。每个索引值关联 一个唯一的 CSI-RS资源， 从而能得到该 CSI-RS资源对应的上行接收点的路损值。 在本实施例中， 用户在发送 PRACH的功控中， 需要采用与目标接收点 （RRH)对应 的路损值， 即只需要 eNB将与该 RRH对应的 CSI-RS资源的索引值 （也即路损值的 索引） 发送给用户。
在步骤 202 中， 原接收点可以通过承载物理下行控制信道 （PDCCH, Physical Downlink Control Channel ) 命令的下行控制信息， 例如 DCI ( Downlink Control Information) format 1A (格式 1A)， 将 CoMP UE与目标接收点之间的路损值的索引 发送给 CoMP UE，也可以通过用户专用无线资源控制信令，将 CoMP UE与目标接收 点之间的路损值的索引发送给 CoMP UE。
如果通过承载物理下行控制信道命令 （PDCCH order) 的下行控制信息 （DCI format 1A)， 将 CoMP UE与目标接收点之间的路损值的索引发送给 CoMP UE, 则可 以有以下两种实施方式：
在一种实施方式中， 原接收点通过 PDCCH order触发用户发送 PRACH, 则在由 PDCCH order触发用户发送 PRACH的 DCI format 1A中， 重用用于载波聚合 （CA， Carrier Aggregation ) 中载波指示的 3比特信令， 艮卩 "Carrier indicator— 0 or 3 bits"来 表示路损值索引， 例如， 可以通过" CoMP index indicator "指示 CoMP用户到目标接 收点的路损值 （PL， Path Loss) 的索引 （index)。
在本实施方式中， 为了避免因重用用于 CA中载波指示的比特信令， 导致对载波 指示构成影响， 本实施方式还可以通过 DCI format 1A中的 1比特信息 "flag"来表 示上述 3 比特信令指示的内容， 是属于载波聚合中的 "Carrier indicator", 还是属于 CoMP中的 "CoMP index indicator^ 例如， 通过 "flag:0"表示上述 3比特信令用于 载波指示，也即表示上述 3bit信令属于载波聚合中的" carrier indicator";通过" flag:l " 表示上述 3比特信令用于指示路损值索引， 也即表示上述 3bit信令属于 CoMP中的 "CoMP index indicator "。
在另外一种实施方式中，原接收点也是通过 PDCCH order触发用户发送 PRACH, 则在承载 PDCCH order的 DCI format 1A中， 利用剩下的冗余比特， 定义一个参数 "CoMP index indicator",来指示 CoMP用户与目标接收点之间的路损值 PL的 index。 例如， 使用 3bit的冗余比特来定义参数 "CoMP index indicator^
如果通过用户专用无线资源控制信令， 将 CoMP UE与目标接收点之间的路损值 的索引发送给 CoMP UE,则原接收点，例如 eNB可以通过发送专用的 UE-specific RRC 参数来指示 CoMP用户发送 PRACH中所用路损值 PL的 index。 通过以上三种实施方式， 原接收点可以将 CoMP UE与目标接收点之间的路损值 的索引发送给 CoMP UE。
在本实施例中，原接收点将目标接收点接收 PRACH的相关参数和 CoMP用户与 目标接收点之间的路损值的索引发送给 CoMP用户， CoMP用户即可根据上述相关参 数中的目标接收功率以及上述索引对应的路损值， 利用上述功控表达式确定 PRACH 的发送功率， 以确定的 PRACH的发送功率发送 PRACH给目标接收点。 其中， 根据 上述相关参数中的功率增强步长和最大重传次数等参数， CoMP用户还可以进一步调 整发送 PRACH的发送功率。
目标接收点接收到 CoMP用户发送的 PRACH后， 即可将相应的 TA值反馈给 CoMP用户， CoMP用户即可确定以多大的 TA值发送数据给目标接收点，由此， CoMP 用户可以与目标接收点同步上， 并接入该目标接收点所辖的小区。
通过本发明实施例的方法， CoMP UE可以以正确的发送功率发送 PRACH到目 标接收点， 获得 CoMP UE与目标接收点之间的 TA值， 建立与目标接收点的上行同 步， 进而接入到该目标小区。
在实施例 1中， 从原接收点侧阐述了该 PRACH的发送功率的控制方法， 以下通 过实施例 2从用户设备侧对该 PRACH的发送功率的控制方法进行说明。 其中， 与实 施例 1相同的内容被合并于实施例 2。
实施例 2
本发明实施例还提供了一种 PRACH的发送功率的控制方法。图 3为该方法的流 程图， 请参照图 3， 该方法包括：
步骤 301： CoMP UE从原接收点获取目标接收点接收 PRACH的相关参数； 其中， 该步骤 301对应实施例 1的步骤 201， 原接收点在与目标接收点交互了目 标接收点接收 PRACH的相关参数后， 可以通过 UE-specific的专用 RRC信令告诉 CoMP用户该目标接收点接收 PRACH的相关参数， 在此不再赘述。
步骤 302: CoMP UE根据原接收点发送的路损值的索引确定与目标接收点之间 的路损值；
其中， 该步骤 302对应实施例 1 的步骤 202， 原接收点可以通过 PDCCH order 的 DCI format 1A (重用用于 CA中载波指示的信令或者利用剩下的冗余比特） 指示 CoMP用户与目标接收点之间的路损值的索引， 也可以通过专用的 UE-specific RRC 参数来指示 CoMP用户与目标接收点之间的路损值的索引，在此不再赘述。通过该路 损值的索引， CoMP用户可以确定其与目标接收点之间的路损值。
步骤 303: CoMP UE根据所述目标接收点接收 PRACH的相关参数中的目标接收 功率和所述路损值确定 PRACH的发送功率。
其中， CoMP用户通过步骤 301和步骤 302分别获得了目标接收点接收 PRACH 的目标接收功率和 CoMP用户到目标接收点的路损值后， 即可利用这两个参数确定 PRACH的发送功率， 例如利用前述的功控表达式， 将通过步骤 301获得的参数作为 上述功控表达式中的 "PREAMBLE_RECEIVED_TARGET_POWER"，将通过步骤 302 获得的参数作为上述功控表达式中的 " PLc "。 进一步的， CoMP用户还可以利用目 标接收点接收 PRACH的其他参数， 调整该发送功率或者调整 PRACH的发送。
通过本发明实施例的方法， CoMP UE可以以正确的发送功率发送 PRACH到目 标接收点， 获得 CoMP UE与目标接收点之间的 TA值， 建立与目标接收点的上行同 步， 进而接入到该目标小区。
实施例 3
本发明实施例还提供了一种 CoMP UE与目标接收点的上行同步方法。 图 4为该 方法的流程图， 请参照图 4， 该方法包括：
步骤 401： CoMP UE确定 CoMP UE到目标接收点的 PRACH的发送功率； 其中， 步骤 401可以通过实施例 3的方法来实现， 实施例 3的内容被合并于此， 在此不再赘述。
步骤 402: CoMP UE根据确定的 PRACH 的发送功率向所述目标接收点发送
PRACH;
步骤 403: CoMP UE根据目标接收点反馈的时间提前量 （TA) 进行与所述目标 接收点的上行同步。
其中， CoMP UE通过向目标接收点发送 PRACH获得了其到目标接收点的 TA后， 即可以这个 TA值， 向目标接收点发送数据， 进而建立与目标接收点的同步。
通过本发明实施例的方法， CoMP UE可以以正确的发送功率发送 PRACH到目 标接收点， 获得 CoMP UE与目标接收点之间的 TA值， 建立与目标接收点的上行同 步， 进而接入到该目标小区。
本发明实施例还提供了一种基站， 如下面的实施例 4所述。 由于该基站解决问题 的原理与上述实施例 1的 PRACH的发送功率的控制方法相似， 因此该基站的实施可 以参见实施例 1的方法的实施， 重复之处不再赘述。
实施例 4
本发明实施例还提供了一种 CoMP传输系统中的基站。图 5为该基站的组成示意 图， 请参照图 5， 该基站包括：
第一发送单元 501， 其将目标接收点接收 PRACH的相关参数发送给 CoMP UE; 第二发送单元 502， 其将 CoMP UE 与目标接收点之间的路损值的索引发送给 CoMP UE, 以便 CoMP UE根据所述目标接收点接收 PRACH的相关参数中的目标接 收功率和所述路损值确定 PRACH的发送功率。
在一个实施例中， 该基站还包括：
交互单元 503， 其与目标接收点进行信令交互， 获得目标接收点接收 PRACH的 相关参数。其中，所述相关参数包括目标接收功率、功率增强步长以及最大重传次数。
在一个实施例中，第一发送单元 501具体用于通过用户专用无线资源控制信令将 所述目标接收点接收 PRACH的相关参数发送给 CoMP UE。
在一个实施例中， 第二发送单元 502具体用于： 通过承载 PDCCH命令的 DCI format 1A， 将 CoMP UE与目标接收点之间的路损值的索引发送给 CoMP UE; 或者， 通过用户专用无线资源控制信令， 将 CoMP UE与目标接收点之间的路损值的索引发 送给 CoMP UE。
在本实施例的一个实施方式中， 第二发送单元 502利用所述 DCI format 1A中用 于进行载波指示的信令指示所述路损值的索引， 并通过所述 DCI format 1A中的 1比 特信息区分所述信令所指示的内容， 以将所述路损值的索引发送给 CoMP UE。
在本实施例的另外一个实施方式中， 第二发送单元 502利用所述 DCI format 1A 中的冗余比特指示所述路损值的索引， 以将所述路损值的索引发送给 CoMP UE。
在本实施例中， 该基站可以是 CoMP传输系统中的宏基站， 也可以是 CoMP传 输系统中的微基站， 只要作为 CoMP UE的上行单点接收的接收点都包含于本发明的 保护范围之内。
通过本发明实施例的基站， CoMP UE可以以正确的发送功率发送 PRACH到目 标接收点， 获得 CoMP UE与目标接收点之间的 TA值， 建立与目标接收点的上行同 步， 进而接入到该目标小区。 本发明实施例还提供了一种用户设备， 如下面的实施例 5所述。 由于该用户设备 解决问题的原理与上述实施例 2的 PRACH的发送功率的控制方法相似， 因此该用户 设备的实施可以参见实施例 2的方法的实施， 重复之处不再赘述。
实施例 5
本发明实施例还提供了一种 CoMP传输系统中的用户设备 （UE)。 图 6为该 UE 的组成示意图， 请参照图 6， 该 UE包括：
获取单元 601， 其从原接收点获取目标接收点接收 PRACH的相关参数； 其中， 这里的目标接收点接收 PRACH的相关参数包括目标接收点接收 PRACH 的目标接收功率、 功率增强步长、 最大重传次数等。
第一确定单元 602， 其根据原接收点发送的路损值的索引确定与目标接收点之间 的路损值；
第二确定单元 603， 其根据所述目标接收点接收 PRACH的相关参数中的目标接 收功率和所述路损值确定 PRACH的发送功率。
其中，本实施例的 UE通过获取单元 601和第一确定单元 602分别获得了目标接 收点接收 PRACH的目标接收功率和 CoMP用户到目标接收点的路损值后，即可通过 该第二确定单元 603， 利用这两个参数确定 PRACH的发送功率， 例如利用前述的功 控表达式， 将通过获取单元 601 获得的参数作为上述功控表达式中的 " PREAMBLE_RECEIVED_TARGET_POWER 将通过第一确定单元 602获得的参 数作为上述功控表达式中的 " PLc "。 进一步的， UE 还可以利用目标接收点接收 PRACH的其他参数， 调整该发送功率或者调整 PRACH的发送。
通过本发明实施例的 UE， 可以以正确的发送功率发送 PRACH到目标接收点， 获得该 UE与目标接收点之间的 TA值， 建立与目标接收点的上行同步， 进而接入到 该目标小区。
本发明实施例还提供了一种用户设备， 如下面的实施例 6所述。 由于该用户设备 解决问题的原理与上述实施例 3的 CoMP UE与目标接收点的上行同步方法相似， 因 此该用户设备的实施可以参见实施例 3的方法的实施， 重复之处不再赘述。
实施例 6
本发明实施例还提供了一种 CoMP传输系统中的用户设备 （UE)。 图 7为该 UE 的组成示意图， 请参照图 7， 该 UE包括： 确定单元 701， 其确定 CoMP UE到目标接收点的 PRACH的发送功率； 发送单元 702， 其根据确定的 PRACH 的发送功率向所述目标接收点发送 PRACH;
同步单元 703，其根据目标接收点反馈的 TA进行与所述目标接收点的上行同步。 在一个实施例中， 该确定单元 701包括：
获取模块 7011， 其从原接收点获取目标接收点接收 PRACH的相关参数； 第一确定模块 7012， 其根据原接收点发送的路损值的索引确定与目标接收点之 间的路损值；
第二确定模块 7013，其根据所述目标接收点接收 PRACH的相关参数中的目标接 收功率和所述路损值确定 PRACH的发送功率。
具体的，该确定单元 701的组成部分的功能可以通过实施例 5的 UE的组成来实 现， 在此不再赘述。
通过本发明实施例的 UE， 可以以正确的发送功率发送 PRACH到目标接收点， 获得该 UE与目标接收点之间的 TA值， 建立与目标接收点的上行同步， 进而接入到 该目标小区。
本发明实施例还提供了一种计算机可读程序，其中当在基站中执行该程序时， 该 程序使得计算机在所述基站中执行实施例 1所述的 PRACH的发送功率的控制方法。
本发明实施例还提供了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 1所述的 PRACH的发送功率的控制方法。
本发明实施例还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所述用户设备中执行实施例 2所述的 PRACH的发送功率的 控制方法或者实施例 3所述的 CoMP UE与目标接收点的上行同步方法。
本发明实施例还提供了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用户设备中执行实施例 2所述的 PRACH的发送功率的控制方法 或者实施例 3所述的 CoMP UE与目标接收点的上行同步方法。
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。逻辑 部件例如现场可编程逻辑部件、微处理器、计算机中使用的处理器等。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

权 利 要 求 书
1、 一种物理随机接入信道 （PRACH) 的发送功率的控制方法， 其中， 所述方法 包括：
原接收点将目标接收点接收 PRACH的相关参数发送给协作多点传输系统中的用 户设备 （CoMP UE);
原接收点将 CoMP UE与目标接收点之间的路损值的索引发送给 CoMP UE, 以便 CoMP UE根据所述目标接收点接收 PRACH的相关参数中的目标接收功率和所述路 损值确定 PRACH的发送功率。
2、 根据权利要求 1所述的方法， 其中， 所述方法还包括：
原接收点与目标接收点进行信令交互，获得目标接收点接收 PRACH的相关参数； 其中， 所述相关参数包括目标接收功率、 功率增强步长以及最大重传次数。
3、 根据权利要求 1所述的方法， 其中， 原接收点将所述目标接收点接收 PRACH 的相关参数发送给 CoMP UE, 包括：
原接收点通过用户专用无线资源控制信令将所述目标接收点接收 PRACH的相关 参数发送给 CoMP UE。
4、 根据权利要求 1所述的方法， 其中， 原接收点将 CoMP UE与目标接收点之间 的路损值的索引发送给 CoMP UE, 包括：
原接收点通过承载物理下行控制信道（PDCCH)命令的下行控制信息（DCI format 1A)， 将 CoMP UE与目标接收点之间的路损值的索引发送给 CoMP UE; 或者
原接收点通过用户专用无线资源控制信令， 将 CoMP UE与目标接收点之间的路 损值的索引发送给 CoMP UE。
5、 根据权利要求 4所述的方法， 其中， 原接收点通过承载 PDCCH命令的 DCI format 1A， 将 CoMP UE与目标接收点之间的路损值的索引发送给 CoMP UE, 包括： 原接收点利用所述 DCI format 1A中用于进行载波指示的信令指示所述路损值的 索引， 并通过所述 DCI format 1A中的 1比特信息区分所述信令所指示的内容； 或者 原接收点利用所述 DCI format 1A中的冗余比特指示所述路损值的索引。
6、 一种 PRACH的发送功率的控制方法， 其中， 所述方法包括：
CoMP UE从原接收点获取目标接收点接收 PRACH的相关参数； CoMP UE根据原接收点发送的路损值的索引确定与目标接收点之间的路损值； CoMP UE根据所述目标接收点接收 PRACH的相关参数中的目标接收功率和所 述路损值确定 PRACH的发送功率。
7、 一种 CoMP UE与目标接收点的上行同步方法， 其中， 所述方法包括： CoMP UE确定 CoMP UE到目标接收点的 PRACH的发送功率；
CoMP UE根据确定的 PRACH的发送功率向所述目标接收点发送 PRACH; CoMP UE根据目标接收点反馈的时间提前量 （TA) 进行与所述目标接收点的上 行同步。
8、根据权利要求 7所述的方法，其中，所述确定 CoMP UE到目标接收点的 PRACH 的发送功率， 包括：
CoMP UE从原接收点获取目标接收点接收 PRACH的相关参数；
CoMP UE根据原接收点发送的路损值的索引确定与目标接收点之间的路损值；
CoMP UE根据所述目标接收点接收 PRACH的相关参数中的目标接收功率和所 述路损值确定 PRACH的发送功率。
9、 一种 CoMP传输系统中的基站， 其中， 所述基站包括：
第一发送单元， 其将目标接收点接收 PRACH的相关参数发送给 CoMP UE; 第二发送单元， 其将 CoMP UE与目标接收点之间的路损值的索引发送给 CoMP
UE, 以便 CoMP UE根据所述目标接收点接收 PRACH的相关参数中的目标接收功率 和所述路损值确定 PRACH的发送功率。
10、 根据权利要求 9所述的基站， 其中， 所述基站还包括：
交换单元， 其与目标接收点进行信令交互， 获得目标接收点接收 PRACH的相关 参数；
其中， 所述相关参数包括目标接收功率、 功率增强步长以及最大重传次数。
11、 根据权利要求 9所述的基站， 其中， 所述第一发送单元具体用于通过用户专 用无线资源控制信令将所述目标接收点接收 PRACH的相关参数发送给 CoMP UE。
12、 根据权利要求 9所述的基站， 其中， 所述第二发送单元具体用于： 通过承载 PDCCH命令的 DCI format 1A， 将 CoMP UE与目标接收点之间的路损 值的索引发送给 CoMP UE; 或者
通过用户专用无线资源控制信令， 将 CoMP UE与目标接收点之间的路损值的索 引发送给 CoMP UE。
13、 根据权利要求 12所述的基站， 其中， 当所述第二发送单元通过承载 PDCCH 命令的 DCI format 1A，将 CoMP UE与目标接收点之间的路损值的索引发送给 CoMP UE时， 所述第二发送单元具体用于：
利用所述 DCI format 1A中用于进行载波指示的信令指示所述路损值的索引， 并 通过所述 DCI format 1A中的 1比特信息区分所述信令所指示的内容； 或者
利用所述 DCI format 1A中的冗余比特指示所述路损值的索引。
14、 一种 CoMP传输系统中的 UE， 其中， 所述 UE包括：
获取单元， 其从原接收点获取目标接收点接收 PRACH的相关参数；
第一确定单元， 其根据原接收点发送的路损值的索引确定与目标接收点之间的路 损值；
第二确定单元， 其根据所述目标接收点接收 PRACH的相关参数中的目标接收功 率和所述路损值确定 PRACH的发送功率。
15、 一种 CoMP传输系统中的 UE， 其中， 所述 UE包括：
确定单元， 其确定 CoMP UE到目标接收点的 PRACH的发送功率；
发送单元， 其根据确定的 PRACH的发送功率向所述目标接收点发送 PRACH; 同步单元， 其根据目标接收点反馈的 TA进行与所述目标接收点的上行同步。
16、 根据权利要求 15所述的 UE， 其中， 所述确定单元包括：
获取模块， 其从原接收点获取目标接收点接收 PRACH的相关参数；
第一确定模块， 其根据原接收点发送的路损值的索引确定与目标接收点之间的路 损值；
第二确定模块， 其根据所述目标接收点接收 PRACH的相关参数中的目标接收功 率和所述路损值确定 PRACH的发送功率。
17、 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 在所述基站中执行权利要求 1-5任一项所述的 PRACH的发送功率的控制方法。
18、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 机在基站中执行权利要求 1-5任一项所述的 PRACH的发送功率的控制方法。
19、 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 算机在所述用户设备中执行权利要求 6所述的 PRACH的发送功率的控制方法。
20、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 机在用户设备中执行权利要求 6所述的 PRACH的发送功率的控制方法。
21、 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 算机在所述用户设备中执行权利要求 7-8任一项所述的 CoMP UE与目标接收点的上 行同步方法。
22、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 机在用户设备中执行权利要求 7-8任一项所述的 CoMP UE与目标接收点的上行同步 方法。
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