WO2014038755A1 - Procédé d'évaluation de canal de liaison montante et système de communication - Google Patents

Procédé d'évaluation de canal de liaison montante et système de communication Download PDF

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Publication number
WO2014038755A1
WO2014038755A1 PCT/KR2012/011069 KR2012011069W WO2014038755A1 WO 2014038755 A1 WO2014038755 A1 WO 2014038755A1 KR 2012011069 W KR2012011069 W KR 2012011069W WO 2014038755 A1 WO2014038755 A1 WO 2014038755A1
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WIPO (PCT)
Prior art keywords
base station
reference signal
sounding reference
uplink
serving base
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PCT/KR2012/011069
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English (en)
Korean (ko)
Inventor
박규진
노민석
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주식회사 케이티
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Publication of WO2014038755A1 publication Critical patent/WO2014038755A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures

Definitions

  • the present invention relates to an uplink channel estimation method and a communication system.
  • MTC Machine Type Communication
  • DUs Digital Units
  • RUs Radio Units
  • each RU forms an independent cell.
  • Het-Net heterogeneous network
  • a cooperative communication technique between adjacent base stations has been proposed as a method for increasing uplink and downlink data rates of a terminal located in a cell boundary region.
  • a terminal located in a cell boundary area requires an uplink channel estimation method with a neighbor base station for cooperative communication.
  • a random UE performs a sounding reference signal for periodically or aperiodically measuring an uplink channel state for uplink channel estimation with a base station of a cell to which it is connected. , Hereinafter referred to collectively as 'SRS'.
  • RRC radio resource control
  • the terminal transmits the SRS according to the UE-specific parameter in an uplink subframe / bandwidth region where the cell-specific parameter is satisfied.
  • a method for enabling uplink channel measurement between a corresponding terminal and a neighboring cell by receiving an SRS transmission of a terminal located in a cell boundary region not only in a serving base station but also in a neighboring base station has been proposed. That is, as the necessity of uplink channel measurement with multiple base stations for cooperative communication has emerged, a method of sharing the SRS configuration information with a neighbor base station and receiving the neighbor base station has been proposed.
  • the conventional SRS is generated based on the physical cell ID (hereinafter, referred to as 'PCI') of the base station to which the terminal belongs, neighboring base stations having different PCIs cannot receive the SRS generated by the serving base station.
  • 'PCI' physical cell ID
  • an uplink signal of a terminal configured with uplink synchronization information (hereinafter, referred to as 'TA') based on a reception timing at a serving base station. It is also opaque whether is received in synchronization with a neighbor base station.
  • the SRS configuration information is determined by the parameters of the serving base station, even if the SRS configuration information is shared with the neighbor base station, at least the following two conditions must be additionally satisfied in order for the neighbor base station to receive the SRS.
  • the conventional SRS transmission scheme considering only uplink channel estimation with a single base station does not provide sufficient uplink channel estimation results for supporting various cooperative communication schemes in the CoMP scenario and HetNet.
  • the uplink channel estimation technique with a plurality of base stations limited to a limited scenario has a narrower application range, and thus, a design of a plurality of uplink channel estimation techniques applicable to various cell deployment scenarios is required. It is true.
  • the TA1 value which is uplink timing synchronization information with the serving base station
  • the TA2 value which is timing synchronization information for transmitting the uplink signal to the adjacent base station
  • Het-Net which is a generalized cell structure
  • uplink synchronization between cells is determined according to the difference in propagation delay of uplink. Differences can occur. Therefore, even when transmitting a reference signal for uplink channel estimation to a neighboring base station, a process of first obtaining a TA2 value of uplink synchronization information with a neighboring base station is necessary.
  • An object of the present invention is to provide a method and communication system for estimating an uplink channel of a multi-cell using a sequential sounding reference signal transmission technique.
  • the uplink channel estimation method is a method for estimating an uplink channel by a terminal, and additionally uplinks with a neighboring base station in addition to a first sounding reference signal configuration parameter for uplink channel estimation with a serving base station.
  • Receiving a second sounding reference signal configuration parameter for link channel estimation from the serving base station Transmitting a first sounding reference signal generated based on the first sounding reference signal configuration parameter to the serving base station; And transmitting a second sounding reference signal generated based on the second sounding reference signal configuration parameter to the adjacent base station.
  • the method may further include receiving second uplink synchronization information, which is uplink synchronization information with the neighboring base station.
  • Receiving may include.
  • the method may include receiving a random access channel response message including the second uplink synchronization information and the second sounding reference signal configuration parameter.
  • the method may include receiving an upper layer signaling response message including the second uplink synchronization information and the second sounding reference signal configuration parameter.
  • the method may include periodically or aperiodically transmitting the second sounding reference signal based on the second uplink synchronization information generated based on the second sounding reference signal configuration parameter.
  • a method for estimating an uplink channel includes: receiving, by a serving base station, an uplink channel, receiving a physical random access channel preamble from a terminal; And receiving, from the neighbor base station, second uplink synchronization information, which is uplink synchronization information with the neighbor base station, from the neighbor base station in addition to the first uplink synchronization information with the uplink synchronization information with the serving base station from the neighbor base station. It includes.
  • the method may include transmitting the second uplink synchronization information to the terminal through a response message in which two or more uplink synchronization information ID regions determined according to the degree of cell overlap are set.
  • It may include a random access channel response message or a higher layer signaling message.
  • the uplink channel estimation method in addition to the first sounding reference signal configuration parameter for uplink channel estimation with the serving base station, the second sounding reference signal configuration parameter for uplink channel estimation with the neighboring base station;
  • the method may further include allocating to the terminal.
  • the second sounding reference through a terminal specific radio resource control signaling including a sounding reference signal configuration ID information region for distinguishing whether the first sounding reference signal configuration parameter or the second sounding reference signal configuration parameter is included.
  • the method may include assigning a signal configuration parameter to the terminal.
  • the uplink channel estimation method may further include receiving a first sounding reference signal according to the first uplink synchronization information generated based on the first sounding reference signal configuration parameter from the terminal; And transmitting a result of estimating an uplink channel to the base station control apparatus based on the first sounding reference signal.
  • a method for estimating an uplink channel of an adjacent base station comprising: receiving, from a terminal, a physical random access channel preamble generated according to information allocated by a serving base station; Measuring uplink synchronization information between the terminal and an adjacent base station using the physical random access channel preamble and transmitting the measured uplink synchronization information to the serving base station; Receiving a sounding reference signal generated according to the uplink synchronization information from the terminal; And reporting an uplink channel estimation result estimated using the sounding reference signal to a base station controller.
  • It may be generated according to a sounding reference signal configuration parameter and uplink synchronization information for uplink channel estimation with the neighbor base station allocated by the serving base station.
  • the communication system further includes a second sounding reference signal configuration parameter for uplink channel estimation with the neighboring base station.
  • a serving base station for allocating a to a terminal and receiving a first sounding reference signal generated based on the first sounding reference signal configuration parameter from the terminal to estimate an uplink channel;
  • a neighboring base station receiving a second sounding reference signal generated based on the second sounding reference signal configuration parameter from the terminal to estimate an uplink channel;
  • a base station control apparatus for estimating a multi-uplink channel for inter-cell cooperative communication using a result of estimating an uplink channel received from the serving base station and a result of estimating an uplink channel received from the neighboring base station.
  • the first sounding reference signal is generated according to the first uplink synchronization information
  • the second sounding reference signal is generated according to the second uplink synchronization information
  • the serving base station may receive the second uplink synchronization information from the neighbor base station, and transmit the second uplink synchronization information to the terminal through a response message for the physical random access preamble received from the terminal. .
  • the serving base station In addition, the serving base station, the serving base station, and
  • a response message including the second uplink synchronization information and the second sounding reference signal configuration parameter may be transmitted to the terminal.
  • the serving base station In addition, the serving base station, the serving base station, and
  • the second uplink synchronization information may be transmitted to the terminal through a response message including an uplink synchronization information ID region.
  • the serving base station In addition, the serving base station, the serving base station, and
  • the second sounding reference signal configuration parameter may be transmitted to the terminal through terminal specific radio resource control signaling including a sounding reference signal ID.
  • the serving base station In addition, the serving base station, the serving base station, and
  • a physical downlink control channel including an indicator for distinguishing a sounding reference signal transmitted through terminal specific radio resource control signaling may be transmitted to the terminal.
  • the serving base station and the adjacent base station are identical to the serving base station and the adjacent base station.
  • It may be connected to the same base station control device or different base station control devices.
  • the serving base station and the adjacent base station are identical to the serving base station and the adjacent base station.
  • the base station control device controls the base station control device
  • It may include a cloud-based base station structure that is connected to the serving base station and the adjacent base station performs a base station control management function and is implemented as a virtual server that is centrally installed in a communication station.
  • the serving base station and the adjacent base station are identical to the serving base station and the adjacent base station.
  • Each cell included in an inter-cell cooperative communication group for a terminal located in a cell boundary region may be formed.
  • a heterogeneous network in which the serving base station and the neighboring base station having different cell coverages may overlap each other may be formed.
  • the serving base station and the adjacent base station are identical to the serving base station and the adjacent base station.
  • a plurality of small cells having a smaller cell radius than the macro cell may be formed.
  • the present invention not only the uplink channel estimation with the serving cell to which the terminal accesses, but also the SRS configuration and transmission scheme for the uplink channel estimation with the neighboring cell.
  • a second SRS configuration method for uplink channel estimation with a neighboring base station and a transmission scheme for the UE for the configured first SRS and the second SRS are provided. do.
  • Het-Net heterogeneous networks
  • CompMP scenario based on the uplink channel estimation result measured by the plurality of base stations, it is possible to provide a basis for determining whether the terminal enters a cooperative communication area (cell boundary area).
  • an independent path establishment method between uplink and downlink may provide a framework capable of providing a result of a base channel estimation for determining whether an uplink path is reset.
  • FIG. 1 is a block diagram of a communication system to which an embodiment of the present invention is applied.
  • FIG. 2 illustrates a cloud-based base station structure to which an embodiment of the present invention is applied.
  • FIG. 3 is a block diagram showing a schematic configuration of a serving base station according to an embodiment of the present invention.
  • FIG. 4 is a block diagram showing a schematic configuration of a neighbor base station according to an embodiment of the present invention.
  • FIG. 5 is a block diagram showing a schematic configuration of a base station control apparatus according to an embodiment of the present invention.
  • FIG. 6 is a block diagram showing a schematic configuration of a terminal according to an embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating a process of obtaining uplink synchronization information (TA) according to an embodiment of the present invention.
  • TA uplink synchronization information
  • FIG. 9 is a flowchart illustrating a process of generating a PRACH preamble according to an embodiment of the present invention.
  • FIG. 10 is a flowchart illustrating an uplink channel estimation method according to an embodiment of the present invention.
  • FIG. 11 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention.
  • FIG. 12 is a flowchart illustrating a method of determining a target terminal according to an embodiment of the present invention.
  • FIG. 13 is a flowchart illustrating a method of determining a target terminal according to another embodiment of the present invention.
  • FIG. 14 is a flowchart illustrating a method of determining a target terminal according to another embodiment of the present invention.
  • ... unit ... unit
  • module etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.
  • a terminal is a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment (User Equipment). It may also refer to a user equipment (UE), an access terminal (AT), and the like, and may include all or some functions of a terminal, a mobile terminal, a subscriber station, a portable subscriber station, a user device, an access terminal, and the like.
  • a base station includes an access point (AP), a radio access station (RAS), a node B (Node B), an advanced node B (evolved NodeB, eNodeB), transmission and reception It may also refer to a base transceiver station (BTS), a mobile multihop relay (MMR) -BS, and the like, and may perform all or part of functions of an access point, a wireless access station, a node B, an eNodeB, a transmission / reception base station, an MMR-BS, and the like. It may also include.
  • AP access point
  • RAS radio access station
  • Node B node B
  • eNodeB advanced node B
  • MMR mobile multihop relay
  • FIG. 1 is a block diagram of a communication system to which an embodiment of the present invention is applied
  • FIG. 2 illustrates a cloud-based base station structure to which an embodiment of the present invention is applied
  • FIG. 3 is a schematic diagram of a serving base station according to an embodiment of the present invention.
  • 4 is a block diagram showing a schematic configuration of a neighboring base station according to an embodiment of the present invention
  • Figure 5 is a block diagram showing a schematic configuration of a base station control apparatus according to an embodiment of the present invention
  • 6 is a block diagram showing a schematic configuration of a terminal according to an embodiment of the present invention.
  • Heterogeneous network Het-Net
  • Het-Net Heterogeneous network
  • a macro cell 300 serving as a service area of the first base station 100 and a small cell 400 serving as a service area of the second base station 200 overlap each other.
  • the small cell 400 covers a smaller area than the macro cell 300.
  • a plurality of small cells 400 may exist in one macro cell 300. That is, in one macro cell 300, a pico cell, a micro cell, and a femto cell by distributed low power remote radio heads (hereinafter referred to as 'RRH'). Small cells 400 such as) overlap.
  • Such a communication system is a cooperative multi-point scenario (CoMP scenario, Coordinated Multi-Point scenario) 3, 4 to increase the uplink and downlink data rate of the terminal located in the cell boundary region through cooperative communication between adjacent cells It may be a cloud-based base station structure introduced, as shown in FIG.
  • a general base station is referred to as a digital unit (hereinafter, referred to as 'DU') 800 and a radio unit (hereinafter referred to as 'RU') ( 900).
  • 'DU' digital unit
  • 'RU' radio unit
  • a typical base station includes a processing unit corresponding to each of the DU 800 and the RU 900 in one physical system, and one physical system is installed in the service area.
  • the DU 800 and the RU 900 are physically separated, and only the RU 900 is installed in the service area.
  • One DU 800 has a control management function for the plurality of RUs 900 forming each independent cell.
  • the DU 800 and the RU 900 may be connected by an optical cable.
  • the DU 800 is a part in charge of digital signal processing and resource management control functions of the base station, and is connected to a core system (not shown). And it is mainly installed in communication companies such as Internet data center (IDC, Internet Data Center).
  • IDC Internet Data Center
  • the DU 800 may use various wireless technologies such as Wideband Code Division Multiple Access (WCDMA), WiBro (WiBro, Wireless Broadband Internet), and Long Term Evolution (LTE) through a virtualization software. In this way, multiple DUs 800 may be operated as one.
  • WCDMA Wideband Code Division Multiple Access
  • WiBro WiBro
  • Wireless Broadband Internet Wireless Broadband Internet
  • LTE Long Term Evolution
  • the RU 900 is a part for amplifying and radiating the radio signal of the radio signal processing section of the base station to the antenna. That is, the RU 900 converts and amplifies the digital signal received from the DU 800 into a radio frequency (RF) signal according to a frequency band.
  • RF radio frequency
  • the first base station 100 and the second base station 200 are implemented with the RU 900 of FIG. 2. And it may be called eNB, RU, RRH (Remote Radio Heads).
  • the base station control apparatus 500 is implemented with the DU (800) of FIG. And it is connected to the first base station 100 and the second base station 200 to manage them.
  • first base station 100 and the second base station 200 are shown to be managed by a single base station control apparatus 500, the first base station 100 and the second base station 200 control the different base stations Each may be managed by the device 500.
  • the terminal 600 located in the cell boundary region is required to estimate an uplink channel with the neighbor base station 200.
  • the terminal 600 located in the cell boundary region is defined as a terminal located in the region where the first cell 300 is located but may be affected by the second cell 400.
  • the terminal 600 located in the cell boundary region is not only the first base station 100 currently connected, unlike the terminal 700 located at the center of the second cell 400 transmits and receives only a signal with the second base station 200.
  • a signal may also be transmitted and received with the second base station 200 which is an adjacent base station.
  • the first base station 100 will be described as a serving base station
  • the second base station 200 will be described as a neighbor base station based on the terminal 600 located in the cell boundary region.
  • the terminal 600 located in the cell boundary region receives the downlink physical channel and the physical signal from the serving base station 100 (1).
  • the downlink physical channel includes a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), and a physical broadcast channel (PBCH).
  • the physical signal includes a Common Reference Signal (CRS), a Primary Synchronization Signal (PSS) / Secondary Synchronization Signal (SSS), a Channel State Information-Reference Signal (CSI RS), a DeModulation-Reference Signal (DM RS), and the like.
  • CRS Common Reference Signal
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • CSI RS Channel State Information-Reference Signal
  • DM RS DeModulation-Reference Signal
  • the terminal 600 located in the cell boundary region according to the uplink channel state between the terminal 600 and the serving base station 100 and the uplink channel state between the terminal 600 and the second base station 200.
  • the channel and physical signals may be set to be transmitted to the serving base station 100 or may be set to be transmitted (2) to the second base station 200.
  • the uplink physical channel includes a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), a physical random access channel (PRACH), and the physical signal includes a sounding reference signal (SRS).
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • PRACH physical random access channel
  • SRS sounding reference signal
  • the target terminal 600 By estimating the uplink channel with the neighboring base station 200 as well as the uplink channel with the serving base station 100 to which the target terminal 600 is currently connected, the target terminal 600 needs the downlink cooperative communication between cells. It may be determined whether or not to determine whether to implement downlink cooperative communication between cells. Alternatively, handover of the target terminal 600 may be implemented. Alternatively, whether to implement UL path redirection of the target terminal 600 may be determined.
  • the uplink path reset refers to a state in which only the uplink is transmitted to the neighboring base station 200 while maintaining the downlink with the serving base station 100.
  • the serving base station 100 includes a communication unit 110, a memory 130, and a processor 150.
  • the communication unit 110 is connected to the processor 150, and transmits and receives a radio signal.
  • the communication unit 110 may include a baseband circuit for processing a radio signal.
  • the memory 130 is connected to the processor 150 and stores various information for driving the processor 150.
  • the memory 130 may be implemented as a medium such as a RAM such as a dynamic random access memory, a RAM random dynamic memory (DRAM), a synchronous DRAM, a static RAM, or the like.
  • the memory 130 may be inside or outside the processor 150 and may be connected to the processor 150 by various well-known means.
  • the processor 150 may be implemented as a central processing unit (CPU), other chipsets, microprocessors, or the like, and layers of the air interface protocol may be implemented by the processor 150.
  • the processor 150 includes an allocator 151, an uplink synchronization manager 153, a channel estimator 155, and a reporter 157.
  • the allocator 151 allocates dedicated RACH resources to the target terminal 600 according to the multi-uplink channel estimation instruction of the base station control apparatus 500.
  • the uplink sync management unit 153 is further adjacent to the first uplink sync information (hereinafter, referred to as TA1), which is sync information for uplink channel estimation between the serving base station 100 and the target terminal 600.
  • the second uplink synchronization information (hereinafter, referred to as "TA2"), which is synchronization information for uplink channel estimation between the base station 200 and the target terminal 600, is provided to the target terminal 600.
  • the channel estimator 155 estimates an uplink channel state based on a first sounding reference signal (hereinafter, referred to as a first SRS) received from the target terminal 600.
  • a first SRS first sounding reference signal
  • the channel estimator 155 uses the first RRS for estimating an uplink channel between the serving base station 100 and the target terminal 600 using radio resource control (hereinafter, referred to as 'RRC') parameters.
  • the configuration parameter is assigned to the target terminal 600.
  • the channel estimator 155 additionally includes a second sounding reference signal (hereinafter, referred to as a 'second SRS') for estimating an uplink channel between the neighbor base station 200 and the target terminal 600. ) Assigns configuration parameters to the target terminal 600.
  • a 'second SRS' second sounding reference signal
  • the reporter 157 receives the uplink channel estimation result from the channel estimator 155 and transmits the uplink channel estimation result to the base station control apparatus 500.
  • the report unit 157 receives the downlink channel estimation result received from the target terminal 600 and transmits the result to the base station control apparatus 500.
  • the neighbor base station 200 includes a communication unit 210, a memory 230, and a processor 250.
  • the communication unit 210 is connected to the processor 250, and transmits and receives a radio signal.
  • the communication unit 210 may include a baseband circuit for processing a radio signal.
  • the memory 230 is connected to the processor 250 and stores various information for driving the processor 250.
  • the memory 230 may be embodied in a medium such as RAM, such as dynamic random access memory, Rambus DRAM, synchronous DRAM, and static RAM.
  • the memory 230 may be inside or outside the processor 250 and may be connected to the processor 250 by various well-known means.
  • the processor 250 may be implemented as a central processing unit, other chipset, microprocessor, or the like, and the layers of the air interface protocol may be implemented by the processor 250.
  • the processor 250 includes an uplink synchronization manager 251, a channel estimator 253, a reporter 255, and a cell interference measurer 257.
  • the uplink synchronization management unit 251 when the uplink synchronization management unit 251 receives the dedicated PRACH preamble from the target terminal 600, the uplink synchronization management unit 251 measures TA2 and transmits the measured TA2 to the serving base station 100.
  • the channel estimator 253 receives the multi-uplink channel estimation instruction from the base station control apparatus 500.
  • the uplink channel state is estimated.
  • the reporter 255 transmits the uplink channel estimation result received from the channel estimator 253 to the base station controller 500.
  • the DL channel estimation result received from the target terminal 600 is transmitted to the base station control apparatus 500.
  • the cell interference signal transmitted from the cell interference measurement unit 257 is transmitted to the base station control apparatus 500.
  • the cell interference measuring unit 257 measures an interference signal due to a neighboring cell. That is, a strong interference signal is measured according to a predefined criterion in a specific UL band through a backhaul network.
  • the base station control apparatus 500 includes a communication unit 510, a memory 530, and a processor 550.
  • the communication unit 510 is connected to the processor 550 to transmit and receive a radio signal.
  • the communication unit 510 may include a baseband circuit for processing a radio signal.
  • the memory 530 is connected to the processor 550 and stores various information for driving the processor 550.
  • the memory 530 may be implemented as a medium such as a RAM such as dynamic random access memory, RAM bus DRAM, synchronous DRAM, static RAM, or the like.
  • the memory 530 may be inside or outside the processor 550, and may be connected to the processor 550 by various well-known means.
  • the processor 550 may be implemented as a central processing unit or other chipset, microprocessor, or the like, and the layers of the air interface protocol may be implemented by the processor 550.
  • the processor 550 includes a target determiner 551, an indicator 553, and a processor 555.
  • the target determiner 551 determines the target terminal 600 that requires the multi-uplink channel measurement instruction.
  • the target determiner 551 may determine the target terminal 600 based on the measurement report.
  • a channel quality indicator CQI
  • PUCCH which is a periodic control or aperiodic, for a channel dependent scheduling for maximizing frequency efficiency. It is defined to report Channel Quality Information (CSI) or Channel State Information (CSI).
  • CSI Channel Quality Information
  • CSI Channel State Information
  • the target terminal 600 Is defined to transmit downlink channel estimation results for the neighboring cell 400 as well as the serving cell 300 currently connected through PUSCH in the form of measurement report RRC signaling.
  • the target determination unit 551 may multi-up based on the downlink channel estimation result received through the channel quality indicator (CQI) or channel state information (CSI) reporting through the PUCCH or the measurement report Rc signaling through the PUSCH.
  • the target terminal 600 requiring the link channel estimation may be determined.
  • the target determiner 551 may determine the target terminal 600 based on the neighbor base station request. That is, multi-uplink channel estimation may be determined for the target terminal 600 scheduled in the uplink band in which cell interference is measured by receiving the cell interference signal from the neighbor base station 200.
  • the indicator 553 instructs the serving base station 100 and the neighbor base station 200 to multi-uplink channel estimation.
  • the processor 555 receives uplink channel estimation results from the serving base station 100 and the neighboring base station 200 with the target terminal 600, respectively, and performs multi-uplink channel estimation. That is, by comparing and analyzing the results of the uplink channel estimation, it is possible to determine whether to implement downlink cooperative communication between cells, whether to handover the target terminal 600, and whether to implement the uplink path resetting of the target terminal 600.
  • the target terminal 600 includes a communication unit 610, a memory 630, and a processor 650.
  • the communication unit 610 is connected to the processor 650, and transmits and receives a radio signal.
  • the communication unit 610 may include a baseband circuit for processing a radio signal.
  • the memory 630 is connected to the processor 650 and stores various information for driving the processor 650.
  • the memory 630 may be embodied in a medium such as RAM, such as dynamic random access memory, Rambus DRAM, synchronous DRAM, and static RAM.
  • the memory 630 may be inside or outside the processor 650 and may be connected to the processor 650 through various well-known means.
  • the processor 650 may be implemented as a central processing unit or other chipset, microprocessor, or the like, and the layers of the air interface protocol may be implemented by the processor 650.
  • the processor 650 includes an uplink synchronization acquisition unit 651, an uplink channel manager 653, and a downlink channel manager 655.
  • the uplink synchronization acquisition unit 651 generates a PRACH preamble according to the dedicated RACH resource configuration signal received from the serving base station 100, and transmits the PRACH preamble to the serving base station 100 and the neighboring base station 200 to serve the serving base station.
  • TA2 is obtained from (100).
  • the uplink channel manager 653 receives a second SRS configuration parameter from the serving base station 100 in addition to the first SRS configuration parameter from the serving base station 100.
  • the first SRS according to the first SRS configuration parameter and TA1 is generated and transmitted to the serving base station 100.
  • a second SRS according to the second SRS configuration parameter and TA2 is generated and transmitted to the neighbor base station 200.
  • the first SRS and the second SRS are sequentially transmitted.
  • the downlink channel manager 655 measures the downlink channel with the serving base station 100 periodically or aperiodically and transmits the downlink channel to the serving base station 100. In this case, when the downlink channel estimation result is less than or equal to a predetermined reference value, the downlink channel estimation result may be reported to the serving base station 100.
  • the downlink channel manager 655 estimates a downlink channel with the neighbor base station 200 and transmits the downlink channel to the neighbor base station 200.
  • FIG. 7 is a flowchart illustrating a process of obtaining uplink synchronization information (TA) according to an embodiment of the present invention.
  • the target determiner 551 of the base station control apparatus 500 determines a target terminal 600 requiring multi-uplink channel estimation (S101).
  • the target terminal 600 may be a terminal located in a boundary area between two or more base stations managed by the base station control apparatus 500 itself.
  • the base station control apparatus 500 may be a terminal located at a boundary area between two or more base stations managed by itself and the other base station control apparatus.
  • the indication unit 553 of the base station control apparatus 500 instructs the multi-uplink channel estimation instruction to the serving base station 100 and the adjacent base station 200 to which the target terminal 600 determined in step S101 is currently connected (Initiation of multi). -UL channel measurement) is transmitted (S103, S105).
  • the allocation unit 151 of the serving base station 100 instructs a random access procedure by transmitting a physical downlink control channel command (PDCCH order) to the target terminal 600 (S107).
  • PDCCH order physical downlink control channel command
  • the physical downlink control channel command includes RACH resource allocation information, and the format is PDCCH format 1A.
  • the PDCCH format 1A is scrambled with a cell radio network temporary identifier (C-RNTI) of the target terminal 600.
  • C-RNTI cell radio network temporary identifier
  • the RACH resource allocation information includes a PRACH preamble index (6 bits) and a PRACH mask index (Mask Index, 4 bits).
  • the uplink synchronization acquisition unit 651 of the target terminal 600 generates a PRACH preamble according to the RACH resource allocation information extracted from the physical downlink control channel command (PDCCH order) received in step S107, and the serving base station 100 (S109).
  • PDCCH order physical downlink control channel command
  • the uplink synchronization acquisition unit 651 of the target terminal 600 configures the PRACH preamble set through the PRACH preamble index information region through a PRACH resource index set through the PRACH mask index. Send according to the information.
  • the PRACH configuration information is received through cell-specific system information of the serving base station 100.
  • a PRACH configuration index, a PRACH-frequency offset, and a RACH-root-sequence (RACH_ROOT_SEQUENCE).
  • the uplink sync management unit 153 of the serving base station 100 measures TA1 (S111).
  • the RACH response message is included in the RACH response message and transmitted to the target terminal 600 (S113).
  • the uplink synchronization acquisition unit 651 of the target terminal 600 transmits the PRACH preamble generated according to the PRACH resource allocation information received in step S107 to the neighbor base station 200 (S115).
  • the physical downlink control channel command (PDCCH order) and PRACH configuration information is a value set in the serving base station 100 to which the target terminal 600 currently establishes a connection.
  • the neighbor base station 200 is a preamble index assigned to the target terminal 600 through the cell-specific PRACH configuration information of the serving base station 100 and the physical downlink control channel command (PDCCH order) (preamble index) and PRACH Mask Index value (knowledge value) should be known. Therefore, although not shown in the figure, the uplink synchronization management unit 251 of the neighboring base station 200 is a preamble index (preamble index) assigned to the target terminal 600 from the allocation unit 151 of the serving base station 100 and The PRACH mask index value can be obtained in advance. Alternatively, the allocation unit 151 of the serving base station 100 may obtain a preamble index and a PRACH mask index value allocated to the target terminal 600 through the base station control apparatus 500. have.
  • the uplink synchronization management unit 251 of the neighbor base station 200 measures TA2 (S117). And it transmits to the serving base station 200 (S119).
  • the uplink synchronization management unit 153 of the serving base station 200 includes TA2 received in step S119 in the RACH response message and transmits it to the target terminal 600 (S121).
  • the 'TA ID' information area may be included in the RACH Response message.
  • the uplink sync acquisition unit 651 of the target terminal 600 may identify whether the TA included in the RACH response message is TA1 or TA2 by checking the 'TA ID' information area.
  • the 'TA ID' information region is provided only for the serving base station 100 and the neighboring base station 200, that is, two TAs (TA1 value and TA2 value) in one UL band. ) Can be limited to settable.
  • the size of the 'TA ID' information area may be determined as 1 bit.
  • the 'TA ID' information area may enable two or more values to be set according to the number of TA values that can be stored in the target terminal 600 or the number of TA values that can be set in a cell. have.
  • the number of two or more TA values is set through cell-specific system information according to the degree of cell overlap at any base station.
  • the size of the 'TA ID' information area may be determined as log2N bit (s) according to the N value of the number of TAs that can be set.
  • the PRACH preamble is transmitted to the neighbor base station 200 using a random access procedure based on a physical downlink control channel command (PDCCH order) defined in the 3GPP LTE / LTE-A system. And, by measuring the TA2 value based on this can be informed to the target terminal 600 through the serving base station 200.
  • PDCCH order physical downlink control channel command
  • FIG. 8 is a flowchart illustrating a process of acquiring uplink synchronization information according to another embodiment of the present invention.
  • the target determiner 551 of the base station control apparatus 500 determines a target terminal 600 requiring multi-uplink channel estimation (S201).
  • the indication unit 553 of the base station control apparatus 500 transmits a multi-uplink channel estimation instruction to the serving base station 100 and the adjacent base station 200 to which the target terminal 600 determined in step S201 is currently connected ( S203, S205).
  • the allocation unit 151 of the serving base station 100 transmits the RACH resource allocation information to the target terminal 600 through higher layer signaling (S207).
  • the higher layer signaling includes radio resource control (hereinafter, referred to as 'RRC') signaling.
  • the uplink synchronization acquisition unit 651 of the target terminal 600 transmits the PRACH preamble generated according to the RACH resource allocation information acquired in step S207 to the serving base station 100 (S209).
  • the uplink synchronization management unit 153 of the serving base station 100 measures TA1 (S211).
  • the TA1 is included in the higher layer signaling response message and transmitted to the target terminal 600 (S213).
  • the higher layer signaling response message includes an RRC response message.
  • the uplink synchronization acquisition unit 651 of the target terminal 600 transmits the PRACH preamble generated according to the RACH resource allocation information received in step S207 to the neighbor base station 200 (S215).
  • the uplink sync management unit 251 of the neighbor base station 200 measures TA2 (S217). And it transmits to the serving base station 200 (S219).
  • the uplink synchronization management unit 153 of the serving base station 200 transmits an RRC response message including the TA2 received in step S219 to the target terminal 600 (S221).
  • each step illustrated in FIG. 9 may be added between steps S207 and S209 of FIG. 8.
  • Higher layer signaling uses RRC signaling as an embodiment.
  • FIG. 9 is a flowchart illustrating a process of generating a PRACH preamble according to an embodiment of the present invention.
  • the uplink synchronization acquisition unit 651 of the target terminal 600 receives an RRC signaling message from the serving base station 100 (S301).
  • the uplink sync acquisition unit 651 of the target terminal 600 determines whether the RRC signaling message received in step S301 includes cell-specific PRACH configuration information of the neighboring base station 200. (S303).
  • the uplink synchronization acquisition unit 651 of the target terminal 600 is based on the cell-specific PRACH configuration information RACH resource allocation information included in the RRC signaling message, that is, PRACH preamble index and PRACH mask index To interpret (S305).
  • the uplink sync acquisition unit 651 of the target terminal 600 the PRACH configuration information received through the cell-specific system information of the serving base station 100 in advance RACH resource allocation information is interpreted based on (S307).
  • the uplink sync acquisition unit 651 of the target terminal 600 determines whether the RRC signaling message received in step S301 includes a TA ID region (S309).
  • the uplink synchronization acquisition unit 651 of the target terminal 600 checks the RACH resource allocation information for each ID (S311).
  • a PRACH preamble for each TA ID is generated based on the information checked in step S311 (S313).
  • the PRACH preamble is generated based on the result analyzed in step S305 or S307 (S315).
  • each step described in FIGS. 10 to 11 is included after each step of FIGS. 7 and 8.
  • FIG. 10 is a flowchart illustrating a method for estimating an uplink channel according to an embodiment of the present invention, in which a case of transmitting periodic SRS is shown.
  • an uplink channel manager 653 of the target terminal 600 is present.
  • the first SRS configuration parameter includes a UE-specific first SRS configuration parameter received from the serving base station 100 through RRC signaling in advance.
  • the uplink channel manager 653 of the target terminal 600 transmits a first SRS periodically to the serving base station 100 (S405).
  • the channel estimator 155 of the serving base station 100 estimates an uplink channel based on the first periodic SRS (S407).
  • the reporting unit 157 of the serving base station 100 reports the channel estimation result of step S407 to the base station control apparatus 500 (S409).
  • the channel estimator 155 of the serving base station 100 allocates an additional second SRS configuration parameter to the target terminal 600 acquiring TA2 through UE-specific RRC signaling (S411). ).
  • the additional second SRS configuration parameter includes all UE-specific SRS configuration parameters. That is, cell-specific SRS subframe and SRS bandwidth, UE-specific SRS bandwidth, hopping pattern, frequency domain position ), Peerdicity, subframe configuration, antenna configuration, base sequence index, and cyclic shift index information. .
  • UE-specific RRC signaling is reconfiguration information about the first SRS configuration parameter with the previously set serving base station 100 or whether the UE-specific RRC signaling is the second SRS configuration parameter with the neighboring base station 200 is determined. It is necessary to distinguish.
  • UE-specific RRC signaling includes an SRS ID information region indicating whether reconfiguration information or a second SRS configuration parameter is included in the first SRS configuration parameter. May contain information.
  • the SRS ID information area may include the VCID (Virtual Cell ID) for recycling the TA ID information area or generating an SRS sequence.
  • VCID Virtual Cell ID
  • step S411 may be merged with step S121 of FIG. 7 or step S221 of FIG. 8. That is, the second SRS configuration parameter may be included together with TA2 in the RACH response message or the higher layer signaling message. This eliminates the need for a separate indicator to distinguish the second SRS configuration parameter.
  • the uplink channel manager 653 of the target terminal 600 sets the TA2 and the second SRS received from the serving base station 100 when the period according to the second SRS configuration parameter received in step S411 arrives (S413).
  • a second periodic SRS is generated according to the parameter (S415).
  • the second periodic SRS generated in step S415 is transmitted to the neighbor base station 200 (S417).
  • the channel estimator 253 of the neighbor base station 200 estimates an uplink channel based on the second periodic SRS (S419).
  • the report unit 255 of the neighbor base station 200 reports the result estimated in step S419 to the base station control apparatus 500 (S421).
  • the processor 555 of the base station control apparatus 500 estimates the multi-uplink channel using the estimation result reported in step S409 and the estimation result reported in step S421 (S419). That is, the processor 555 of the base station control apparatus 500 compares and analyzes the estimation result reported in step S409 and the estimation result reported in step S421 to determine whether to implement downlink cooperative communication between cells, whether the terminal 600 is handed over, It may be determined whether the uplink path reconfiguration of the terminal 600 is implemented.
  • the first SRS and the second SRS are periodically and repeatedly transmitted as a periodic SRS set to trigger type 0.
  • FIG. 11 is a flowchart illustrating an uplink channel estimation method according to another embodiment of the present invention, in which aperiodic SRS is used as an embodiment.
  • the uplink channel manager 653 of the target terminal 600 generates the first SRS configuration parameter and the aperiodic first SRS according to TA1 received from the serving base station 100 through RRC signaling in advance. (S501).
  • step S501 the aperiodic first SRS generated in step S501 is transmitted to the serving base station (S503).
  • the channel estimator 155 of the serving base station 100 estimates an uplink channel using the aperiodic first SRS received in step S503 (S505). The estimated result is reported to the base station control apparatus 500 (S507).
  • the channel estimator 155 of the serving base station 100 allocates an additional second SRS configuration parameter to the target terminal 600 acquiring TA2 through UE-specific RRC signaling (S509). ).
  • the trigger type (trigger type) 1 is set.
  • the channel estimator 155 of the serving base station 100 transmits triggering information for aperiodic SRS transmission through the PDCCH (S511). At this time, whether to request aperiodic transmission for the first SRS or the second SRS. Include a signal type indicator that indicates whether to request aperiodic transmission for. In this case, the signal type indicator may further define a 1 bit indication information region in the PDCCH.
  • the PDCCH includes only triggering information and requests aperiodic transmission for the first SRS using the SRS ID in UE-specific RRC signaling, or aperiodic transmission for the second SRS. It can indicate whether or not to request.
  • step S509 may be merged with step S121 of FIG. 7 or step S221 of FIG. 8. That is, the second SRS configuration parameter may be included together with TA2 in the RACH response message or the higher layer signaling message. This eliminates the need for a separate indicator to distinguish the second SRS configuration parameter.
  • the uplink channel manager 653 of the target terminal 600 checks the SRS type through the PDCCH received in step S511 (S513).
  • the uplink channel manager 653 of the target terminal 600 generates aperiodic second SRS according to the TA2 and the second SRS configuration parameters (S515). And it transmits to the adjacent base station 200 (S517).
  • the channel estimator 253 of the neighbor base station 200 estimates an uplink channel based on the aperiodic second SRS (S519).
  • the report unit 255 of the neighbor base station 200 reports the result estimated in step S519 to the base station control apparatus 500 (S521).
  • the processor 555 of the base station control apparatus 500 estimates the multi-uplink channel using the estimation result reported in step S507 and the estimation result reported in step S521 (S523).
  • the target determiner 551 of the base station control apparatus 500 determines a target terminal requiring multi-uplink channel estimation in FIGS. 7 and 8 will be described below.
  • FIG. 12 is a flowchart illustrating a method of determining a target terminal according to an embodiment of the present invention.
  • the downlink channel manager 655 of the target terminal 600 estimates a downlink channel of a serving cell currently being accessed (S601).
  • the estimated result is periodically or aperiodically reported to the serving base station 100 through the uplink control channel (PUCCH) (S603).
  • PUCCH uplink control channel
  • the reporting unit 157 of the serving base station 100 reports the estimation result received in step S603 to the base station control apparatus 500 (S605).
  • the target determiner 551 of the base station control apparatus 500 determines whether the corresponding terminal is the target terminal 600 requiring multi-uplink channel estimation based on the downlink channel estimation result received in step S605 (S607). ).
  • the downlink channel estimate may be determined as a terminal located at a cell boundary and may be determined as a terminal requiring a multi-uplink channel estimation indication.
  • FIG. 13 is a flowchart illustrating a method of determining a target terminal according to another embodiment of the present invention.
  • the downlink channel manager 655 of the target terminal 600 estimates a downlink channel of a serving cell currently being accessed (S701).
  • the estimation result satisfies the predefined condition (S703). For example, it may be determined whether a specific situation for handover support according to the movement of the terminal, that is, the result of downlink channel estimation with the serving cell is less than or equal to a predetermined threshold.
  • the downlink channel manager 655 of the target terminal 600 reports the estimation result periodically or aperiodically to the serving base station 100 through the uplink control channel (PUCCH). (S705). Then, the reporting unit 157 of the serving base station 100 reports the estimation result received in step S705 to the base station control apparatus 500 (S707).
  • the downlink channel manager 655 of the target terminal 600 estimates the downlink channel of the neighbor cell (S709), and reports the estimation result to the neighbor base station 200 (S711). Then, the report unit 255 of the neighbor base station 200 reports the estimation result received in step S711 to the base station control apparatus 500 (S713).
  • the target determiner 551 of the base station control apparatus 500 determines whether the corresponding terminal is the target terminal 600 that requires multi-uplink channel estimation based on the downlink channel estimation results received in steps S707 and S713. (S715).
  • the downlink channel estimation result for the neighboring cell as well as the serving cell currently connected is defined to be transmitted in the form of measurement report RRC signaling.
  • FIG. 14 is a flowchart illustrating a method of determining a target terminal according to another embodiment of the present invention.
  • the cell interference measuring unit 257 of the neighboring base station 200 is measured (S801). In operation S803, the measurement result is reported to the base station control apparatus 500.
  • the target determiner 551 of the base station control apparatus 500 determines the target terminal 600 requiring multi-uplink channel estimation based on the measurement result of the cell interference signal reported in step S803 (S805).
  • a dedicated PRACH resource for multi-uplink channel estimation may be allocated to a UE scheduled in a specific uplink band where a cell interference signal is detected.
  • the embodiments of the present invention described above are not only implemented through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiments of the present invention or a recording medium on which the program is recorded.

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Abstract

L'invention concerne un procédé pour évaluer un canal de liaison montante, et un système de communication. Le procédé pour évaluer le canal de liaison montante est exécuté par un terminal, et comprend les étapes consistant : à recevoir un deuxième paramètre de configuration de signal de référence de sondage qui est attribué par une station de base de desserte, pour évaluer un canal de liaison montante comprenant une station de base voisine en plus d'un premier paramètre de configuration de signal de référence de sondage pour estimer le canal de liaison montante comprenant la station de base de desserte; à transmettre un premier signal de référence de sondage qui est généré en fonction du premier paramètre de configuration de signal de référence de sondage, à la station de base de desserte; et à transmettre un second signal de référence de sondage qui est généré en fonction du deuxième paramètre de configuration de signal de référence de sondage, à la station de base voisine.
PCT/KR2012/011069 2012-09-10 2012-12-18 Procédé d'évaluation de canal de liaison montante et système de communication WO2014038755A1 (fr)

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WO2020028394A1 (fr) * 2018-08-02 2020-02-06 Qualcomm Incorporated Transmissions de signaux de référence de sondage appariées dans une opération de point de réception/multi-transmission
WO2021134698A1 (fr) * 2019-12-31 2021-07-08 华为技术有限公司 Procédé et appareil de configuration de période de signal de référence de sondage (srs)
WO2022204931A1 (fr) * 2021-03-30 2022-10-06 Apple Inc. Canal physique à accès aléatoire (prach) de cellule voisine ordonnancé par canal physique de contrôle descendant (pdcch) et temporisation basée sur groupe de faisceaux

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