WO2015115784A1 - Procédé et appareil pour distribuer une charge entre des cellules, et atténuation d'interférences dans un système de communication sans fil - Google Patents

Procédé et appareil pour distribuer une charge entre des cellules, et atténuation d'interférences dans un système de communication sans fil Download PDF

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Publication number
WO2015115784A1
WO2015115784A1 PCT/KR2015/000879 KR2015000879W WO2015115784A1 WO 2015115784 A1 WO2015115784 A1 WO 2015115784A1 KR 2015000879 W KR2015000879 W KR 2015000879W WO 2015115784 A1 WO2015115784 A1 WO 2015115784A1
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WIPO (PCT)
Prior art keywords
base station
terminal
cell
spare area
macro
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PCT/KR2015/000879
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English (en)
Korean (ko)
Inventor
전병욱
김은용
맹승주
전남열
한승희
Original Assignee
삼성전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020140040220A external-priority patent/KR102226464B1/ko
Application filed by 삼성전자 주식회사 filed Critical 삼성전자 주식회사
Priority to JP2016549125A priority Critical patent/JP6704347B2/ja
Priority to US15/114,626 priority patent/US10999774B2/en
Priority to CN201580006389.3A priority patent/CN106105286B/zh
Priority to EP15744012.4A priority patent/EP3101936B1/fr
Publication of WO2015115784A1 publication Critical patent/WO2015115784A1/fr

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    • 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
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
    • H04W16/08—Load shedding arrangements
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for load balancing and interference mitigation between cells in a heterogeneous network wireless communication system.
  • mobile communication systems have been developed to provide voice services while guaranteeing user activity.
  • mobile communication systems are gradually expanding to not only voice but also data services, and now they have developed to the extent that they can provide high-speed data services.
  • a shortage of resources and users demand faster services, and thus, a more advanced mobile communication system is required.
  • LTE Long Term Evolution
  • 3GPP The 3rd Generation Partnership Project
  • LTE is a technology that implements high-speed packet-based communication with a transmission rate of up to 100 Mbps.
  • various methods are discussed.
  • the network structure can be simplified to reduce the number of nodes located on the communication path, or the wireless protocols can be as close to the wireless channel as possible.
  • the present invention has been made to solve the above problems, and an object of the present invention is to provide a method and apparatus for effectively managing a terminal by a base station in a heterogeneous network mobile communication system in which a macro cell and a small cell are mixed.
  • an object of the present invention is to provide a method and apparatus for the base station effectively manages the terminal, cell load balancing and interference mitigation.
  • an inter-cell load balancing method of a first base station is provided to the second base station to distribute the inter-cell load. And setting a spare area for the spare area, and controlling the load distribution between base stations according to the spare area.
  • a first base station for distributing loads between cells includes a transceiver for transmitting and receiving a signal to and from a terminal or the second base station, and a load between cells. And a controller configured to set a spare area for the second base station to distribute and to distribute the load between the base stations according to the spare area.
  • the measurement report method of the terminal is a step of receiving a measurement report setup message from the first base station, the spare area for the second base station Detecting an entry or departure of a signal; and transmitting a measurement report to the first base station according to the setting of the measurement report setting message.
  • the terminal performing the measurement report receives a transmission and reception unit for transmitting and receiving a signal with the base station, and receives the measurement report setting message from the first base station, And a control unit for detecting entry or departure into the spare area for the second base station and controlling to transmit the measurement report to the first base station according to the setting of the measurement report setting message.
  • the present invention it is possible to increase the radio resource efficiency of a network by providing an inter-cell load balancing method and an inter-cell interference coordination method in a heterogeneous network mobile communication system in which a macro base station and a small base station are mixed.
  • an inter-cell load balancing method and an inter-cell interference coordination method it is possible to adaptively reflect the load balancing state of the network.
  • HetNet heterogeneous network
  • FIG. 2 is a diagram illustrating cell area extension of a small base station in a mobile communication system having a heterogeneous network structure
  • FIG 3 illustrates a network (network) structure according to an embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating an internal structure of a macro base station according to an embodiment of the present invention.
  • FIG. 5 is a block diagram illustrating an internal structure of a small base station according to an embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a concept of a state of a terminal when cell area extension is applied according to an embodiment of the present invention.
  • FIG. 7 is a diagram illustrating an example of cell-specific and terminal-specific small cell extension region configuration according to an embodiment of the present invention.
  • FIG. 8 is a diagram illustrating an example of a state transition diagram of a terminal when cell area extension is applied according to an embodiment of the present invention.
  • FIG. 9 is a diagram illustrating a measurement report setting and a terminal state management method for terminal state management of a macro base station according to an exemplary embodiment of the present invention.
  • FIG. 10 is a diagram illustrating a measurement report setting and a terminal state management method for terminal state management of a small base station according to an embodiment of the present invention.
  • FIG. 11 illustrates a schematic load balancing operation of a macro base station and a small base station according to an embodiment of the present invention.
  • FIG. 12 is a diagram illustrating an example of a method for calculating an ABS ratio of a macro base station according to an embodiment of the present invention.
  • FIG. 13 is a diagram illustrating a handover determination method for load balancing of a macro base station and a small base station according to an embodiment of the present invention.
  • FIG. 14 is a flowchart illustrating a load handover operation procedure of a macro base station and a small base station according to an embodiment of the present invention.
  • the 15 illustrates an example of operations and message flows of the macro base station 1510, the small base station 1520, and the terminal 1530 when performing load balancing handover from the macro base station to the small base station according to an embodiment of the present invention.
  • FIG. 16 illustrates a concept of an integrated load balancing method in which a load balancing handover and a CRE region adjustment are combined according to an embodiment of the present invention.
  • FIG. 17 is a flowchart illustrating a process of performing load balancing between integrated cells by combining load balancing handover and CRE region adjustment of a macro base station and a small base station according to an embodiment of the present invention.
  • FIG. 18 is a diagram illustrating a load balancing handover procedure of a base station in an integrated cell load balancing operation procedure combining load balancing handover and CRE region adjustment according to an embodiment of the present invention.
  • 19 is a block diagram showing the internal structure of a terminal according to an embodiment of the present invention.
  • each block of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in flow chart block (s). It creates a means to perform the functions. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block (s).
  • Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart block (s).
  • each block may represent a portion of a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
  • logical function e.g., a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
  • the functions noted in the blocks may occur out of order.
  • the two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the corresponding function.
  • ' ⁇ part' used in the present embodiment refers to software or a hardware component such as an FPGA or an ASIC, and ' ⁇ part' performs certain roles.
  • ' ⁇ ' is not meant to be limited to software or hardware.
  • ' ⁇ Portion' may be configured to be in an addressable storage medium or may be configured to play one or more processors.
  • ' ⁇ ' means components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, and the like. Subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables.
  • the functionality provided within the components and the 'parts' may be combined into a smaller number of components and the 'parts' or further separated into additional components and the 'parts'.
  • the components and ' ⁇ ' may be implemented to play one or more CPUs in the device or secure multimedia card.
  • an embodiment of the present invention will be described for a method and apparatus for load balancing and inter-cell interference coordination in a heterogeneous network mobile communication system in which a macro cell and a small cell are mixed.
  • a heterogeneous network mobile communication system in which a macro base station and a small base station are mixed when the small base station (or cell) is additionally constructed and operated so as to overlap the existing macro base station (or cell) area, the macro base station is operated.
  • An apparatus and a method for distributing a load between a network and the small base station and mitigating the interference effect of the macro base station on the small base station are described.
  • HetNet Heterogeneous Network
  • Further network construction may include reducing macro cell area by increasing macro cell base station offices, or additionally constructing small output cells of low output within the macro cell area.
  • Addition of small base stations is advantageous in terms of cost compared to macro base station expansion, but due to the difference in output between the macro base station and the small base station and the difference in antenna installation position, the load of the existing macro cell may not be sufficiently distributed to the additional small cells. have.
  • FIG. 2 is a diagram illustrating cell area extension of a small base station in a mobile communication system having a heterogeneous network structure.
  • CRE cell range expansion
  • the terminal measures the reception power of neighboring cells, and the cell having the largest measured reception power is selected.
  • the cell region extension method is a method of expanding a region where a corresponding cell is selected as a serving cell as shown in FIG. 210 by applying a cell specific offset to a reception power measurement of a terminal.
  • the small cell terminal located in the cell extension region may not be able to communicate normally due to interference of the macro cell downlink cell that is stronger than the service small cell signal, an inter-cell interference control method is required.
  • the interference source macro base station restricts specific signal transmission, channel transmission, and activity in some subframes, and the subframe is called ABS (Almost Blank Subframe).
  • Terminals of the small cell receive less interference from the macro cell in the corresponding subframe, and the small base station may use the subframe for transmission to the terminal for which strong interference is expected from the macro cell.
  • the information about the ABS is exchanged through the X2 interface between base stations.
  • the X2 interface is a wired interface.
  • the interference experienced by the terminal of the small cell may cause a large difference depending on whether the macro cell is ABS and non-ABS.
  • the UE measures and reports a cell
  • a standard for limiting resources to be measured (measurement resource restriction) and reporting for each limited resource has been established.
  • a direct and simple method of distributing a load of a macro cell to small cells is to apply a cell-specific offset to a small cell, thereby collectively for terminals located in an extended cell region. Handover to a small cell.
  • the cell specific offset may be set by the serving base station through user-specific signaling for each terminal. Therefore, in consideration of the signaling overhead, it is difficult to dynamically change the cell specific offset for the purpose of expanding the cell area of the small cell according to the load balancing state of the macro cell and the small cell.
  • the time domain inter-cell interference coordination standard is an inter-base station signaling for performing interference mitigation for a small cell of a macro cell in a heterogeneous network, a signal between a base station and a terminal, a measurement resource limitation of a terminal, and performance requirements of a terminal.
  • the minimum standard that includes is specified.
  • the present invention is derived from the above necessity, and provides a method and apparatus for performing radio resource management in a heterogeneous network mobile communication system in which a macro cell and a small cell are mixed.
  • the present invention also provides a method and apparatus for load balancing between a macro cell and a small cell in a heterogeneous network mobile communication system in which the macro cell and the small cell are mixed.
  • the present invention also provides a method and apparatus for coordinating interference between a macro cell and a small cell in a heterogeneous network mobile communication system in which the macro cell and the small cell are mixed.
  • FIG. 3 is a diagram illustrating a network (network) structure according to an embodiment of the present invention.
  • At least one small base station 330 is overlapped with each other in the cell region 320 of the macro base station 310.
  • the macro base station 310 has an X2 interface with at least one peripheral macro base station or one or more peripheral small base stations.
  • Small base station 330 has an X2 interface with at least one peripheral macro base station or one or more small base stations.
  • the small base station 220 may have a cell area 340 in which the small base station 220 may provide a service.
  • the cell region 340 may be extended 350 according to an embodiment of the present invention.
  • the macro base station 310 may cooperate with at least one small base station 330 to perform load balancing and inter-cell interference coordination.
  • the small base station 330 may perform an inter-cell load balancing function and an inter-cell interference coordination function in cooperation with at least one macro base station 310.
  • a macro base station and a small base station counterpart that perform load balancing between cells and indirect coordination between cells may be referred to as an 'eICIC partner base station (or cell)'.
  • the small base station 330 may perform cell area expansion from the macro base 310 station for load balancing purposes.
  • the macro base station according to the embodiment of the present invention includes an inter-cell load balancing controller and an inter-cell interference coordination unit.
  • the inter-cell load balancing controller of the macro base station includes a macro cell extension area terminal manager 405, a self and neighbor cell load information manager 410, a load balancing handover determination unit 415, and a load balancing handover control unit 420. can do.
  • the inter-cell interference coordination unit of the macro base station includes a self and neighboring cell load information management unit 410, an ABS ratio determination unit 425, an ABS pattern generator 430, a wireless packet scheduler 435, and a measurement resource control unit 440 of the terminal. It may include an interface with a small base station.
  • the macro cell extension area terminal manager 405 receives MR information received from a terminal having a macro cell as a serving cell, and manages the terminal into a CRE terminal state and a non-CRE terminal state.
  • the macro cell extension area terminal manager 405 transmits the corresponding information to the load balancing handover determination unit 415 and the load balancing handover control unit 420 as outputs.
  • the magnetic and neighbor cell load information management unit 410 receives the neighbor cell load information received from the neighbor base station and the magnetic cell load information received from the magnetic cell load calculation unit 445 and manages the cell load list.
  • the magnetic and neighbor cell load information management unit 410 transmits the corresponding information to the load balancing handover determination unit 415 and the ABS ratio determination unit 425 as an output.
  • the self cell load calculation unit 445 receives the packet scheduling information from the radio packet scheduler 435 as an input and calculates the load of the own cell.
  • the magnetic cell load calculator 445 transmits the result to the magnetic and neighboring cell load information manager 410 as an output.
  • the load balancing handover determination unit 415 receives the magnetic and neighbor cell information from the magnetic and neighbor cell load information management unit 410 as an input, determines whether to distribute the magnetic cell load to neighbor cells, and outputs offload determination information as an output. It is transmitted to the load balancing handover control unit 420.
  • the ABS ratio determination unit 425 receives the magnetic and peripheral cell load information from the magnetic and peripheral cell load information management unit 410 as an input, determines the ABS ratio, and outputs the ABS ratio information as the ABS pattern generator 430. To pass on.
  • the load balancing handover performing unit 420 receives the CRE terminal information from the CRE terminal from the macro cell CRE terminal management unit 405 and the load balancing handover determination information from the load balancing handover determination unit 415 as a load balancing hand. Perform over operation.
  • the ABS pattern generator 430 receives an ABS ratio from the ABS ratio determiner 425, determines an ABS pattern, and transmits the ABS pattern to the wireless wireless packet scheduler 435 and the eICIC partner small base station as an output. .
  • the wireless packet scheduler 435 receives the ABS pattern from the ABS pattern generator 430 as an input, schedules a radio resource to the terminal in consideration of the ABS pattern, and transmits the scheduling result to the magnetic load calculator 445 as an output. do.
  • the macro base station is composed of a plurality of blocks, and each block performs a different function, the present invention is not limited thereto.
  • the macro base station may include a transmitting and receiving unit for transmitting and receiving a signal with a terminal or a small base station, and the control unit may be implemented to perform all of the above functions.
  • the controller may set a spare area for the small base station to distribute the load between cells and control the terminal to be managed according to the spare area.
  • the controller may divide and manage a terminal having the macro base station as a serving base station into a macro cell base station spare area terminal and a macro cell non spare area terminal.
  • the controller may determine whether load balancing is required and control to handover any terminal to the second base station when load balancing is required.
  • the controller may be configured to perform the load based on at least one of whether the inter-cell interference control function is activated, whether or not the inter-cell interference control partner cell is present, the currently applied ABS (Almost Blank Subframe) ratio, or whether the macro cell spare region terminal is present. You can determine if you need to be distributed.
  • the controller may select at least one terminal for load balancing, request a measurement report from the selected terminal, and control to receive the measurement report from the selected terminal in response to the request.
  • the controller may select a terminal located in the spare area for the second base station having a load of an arbitrary second base station less than or equal to a predefined threshold value as the terminal for load balancing.
  • the controller may determine a terminal having the largest reference signal received power (RSRP) for the small base station as the terminal to perform the handover.
  • RSRP reference signal received power
  • the controller may control to transmit the measurement report setting message configured to perform the measurement report to the terminals when any terminal enters or leaves the spare area.
  • the controller may receive a measurement report from the terminal moved to the spare area and control the terminal moved to the spare area to be a macro cell spare area terminal.
  • the controller may receive a measurement report from the terminal leaving the spare area and control the terminal leaving the spare area to be a macro cell non- spare area terminal.
  • the small base station may include an inter-cell load balancing controller and an inter-cell interference coordination unit.
  • the inter-cell load balancing controller of the small base station includes a small cell extension area terminal manager 505, a self and neighbor cell load information manager 510, a load balancing handover determination unit 515, and a load balancing handover control unit 520. do.
  • the inter-cell interference coordination unit of the small base station may include an interface with the magnetic and neighbor cell load information management unit 510, the radio packet scheduler 525, the radio resource measurement control unit 530 of the terminal, and the small base station.
  • the small CRE terminal manager 505 may receive MR information received from a terminal having a small cell as a serving cell, and manage the terminal by dividing the terminal into a CRE terminal state and a non-CRE terminal state.
  • the small CRE terminal manager 505 may transmit the corresponding information to the load balancing handover determination unit 515 and the load balancing handover control unit 520 as an output.
  • the magnetic and neighbor cell load information management unit 510 may receive the neighbor cell load information received from the neighbor base station and the magnetic cell load information received from the magnetic cell load calculation unit 535 and manage a cell load list. .
  • the magnetic and neighbor cell load information management unit 510 may transmit the corresponding information to the load balancing handover determination unit 515 as an output.
  • the self cell load calculator 535 receives the packet scheduling information from the radio packet scheduler 525 as an input, calculates the load of the own cell, and transmits the result to the self and neighbor cell load information manager 510 as an output. do.
  • the load balancing handover determination unit 515 receives magnetic and neighbor cell information from the magnetic and neighbor cell load information management unit 510 as an input, determines whether to distribute the magnetic cell load to neighbor cells, and outputs offload determination information as an output. It is transmitted to the load balancing handover control unit 520.
  • the load balancing handover performing unit 520 receives the CRE terminal information from the CRE terminal from the small CRE terminal management unit 505 and the load balancing handover determination information from the load balancing handover determination unit 515 as load balancing handover. Perform the action.
  • the radio packet scheduler 525 receives ABS pattern information from an eICIC partner macro base station as an input, schedules a radio resource to the terminal in consideration of the ABS pattern, and transmits the scheduling result to the magnetic load calculator 535 as an output.
  • the small base station is composed of a plurality of blocks, and each block performs a different function
  • the present invention is not limited thereto.
  • any control unit may be implemented to perform all of the above functions. Since this has been described with reference to FIG. 4, a detailed description thereof will be omitted.
  • a method of load balancing between a macro base station and a small base station includes: managing a cell area extension terminal, collecting load information of a self and a neighboring cell, and determining whether to perform offload , And performing a load balancing handover.
  • the load balancing method will be described in detail.
  • FIG. 6 is a diagram illustrating a concept of a state of a terminal when cell area extension is applied according to an embodiment of the present invention.
  • cell area after cell area extension 620 compared to the "cell area before cell area extension 610" of the small base station is called a cell extension area (CRE area or spare area).
  • the 'cell area after cell area extension 620' may be used as meaning not including 'the cell area before cell area extension 610'.
  • a terminal located in the cell extension region of the small cell and serving as a serving cell is referred to as a "macro cell CRE terminal" (or “macro cell spare region terminal") 610.
  • a terminal excluding a macro cell CRE terminal among the terminals using the macro cell as a serving cell is referred to as a macro cell non-CRE terminal (or a macro cell non- spare area terminal).
  • a terminal located in the cell extension region of the small cell and serving as the serving cell is referred to as a "small cell CRE terminal” (or “small cell spare area terminal") 630.
  • a terminal other than a "small cell CRE terminal” among terminals having the small cell as a serving cell is referred to as a "small cell non-CRE terminal” ("small cell non- spare area terminal”) 640.
  • the cell extension area is operated as a shared cell area of the macro cell and the pico cell, not a unique cell area of the macro cell or the small cell.
  • FIG. 7 is a diagram illustrating an example of cell-specific and terminal-specific small cell extension area configuration according to an embodiment of the present invention.
  • the extent expansion (CRE bias or CRE offset) of the small cell may be differently applied to the small cell or the terminal specific according to whether the terminal supports the interference coordination function between time domain cells and the ability to cancel neighbor cell interference.
  • the macro base station and the small base station may differentially apply the degree of small cell expansion to the terminal providing the service by receiving the inter-cell interference condition function and the neighbor cell interference cancellation capability information as inputs. This will be described with reference to FIG. 7.
  • the macro base station 710 supports a time domain inter-cell interference function among terminals providing a service, and a small cell first cell extended region (or small cell first spare area) 720 for a terminal that does not support the neighbor cell interference cancellation function. ) May be set to the UE-specific small cell extension area.
  • the macro base station 710 supports a time domain inter-cell interference function among the terminals providing a service, and a small cell second cell extension further extended compared to the small cell first extended region to a terminal supporting the neighbor cell interference cancellation function.
  • the area (or the small cell second spare area) 730 may be set as the terminal specific small cell extension area.
  • the small cell second spare area 730 is wider than the small cell first spare area 720 because the small cell second spare area 730 is for a terminal that supports the neighbor cell interference cancellation function.
  • the terminal may more effectively cancel the interference from the neighbor cell through the neighbor cell interference cancellation function. Therefore, since the terminal can effectively remove interference compared to the terminal that does not support the neighbor cell interference cancellation function, it can be provided from the small base station 740 through a wider area.
  • FIG. 8 is a diagram illustrating an example of a state transition diagram of a terminal when cell area extension is applied according to an embodiment of the present invention.
  • the terminal is a 'macro cell non-CRE terminal' 810, 'macro cell CRE terminal' 820, 'small cell non-CRE terminal' 830, 'small cell CRE terminal' It may have a state of any one of 840.
  • the macro base station may manage a state of a terminal using the base station as a serving base station according to the macro state CRE UE and a macro cell non-CRE UE according to the terminal state transition diagram.
  • the small base station may manage a state of a terminal using the base station as a serving base station by classifying the small cell CRE UE and the small cell non-CRE UE according to the terminal state transition diagram.
  • a terminal that does not support the time domain inter-cell interference coordination function may have one of a macro cell non-CRE terminal state and a macro cell CRE terminal state.
  • the terminal for supporting the interference coordination function between time domain cells may have one of a macro cell non-CRE terminal state, a macro cell CRE terminal state, a small cell CRE terminal state, and a small cell CRE terminal state.
  • the macro base station may set the measurement report condition to the macro cell terminal that does not support the interference coordination function between time domain cells using an A3 event as shown in Table 1 below.
  • the terminal may perform a measurement report when the following measurement report condition is satisfied.
  • the macro base station receiving the measurement report may control the terminal to handover to the small cell.
  • the macro base station may manage the terminal as a small cell non-CRE terminal state for the terminal that has performed the handover.
  • the small base station may set the measurement report condition to the small cell terminal that does not support the time-domain interference coordination function using the A3 event as shown in Table 2 below.
  • the terminal may perform a measurement report when the following measurement report condition is satisfied.
  • the small base station receiving the measurement report may control the terminal to handover to the macro cell.
  • the small base station manages the terminal as a macro cell non-CRE terminal state.
  • the macro base station may control the macro cell CRE terminal to perform handover for load balancing to the small base station in consideration of load conditions of the macro base station and the small base station.
  • the small base station may control the small cell CRE terminal to perform handover for load balancing to the macro base station in consideration of the load conditions of the macro base station and the small base station.
  • FIG. 9 is a diagram illustrating a measurement report setting and a terminal state management method for terminal state management of a macro base station according to an exemplary embodiment of the present invention.
  • the macro base station 910 is a measurement report triggering condition for classifying a terminal serving the macro cell into a macro cell non-CRE terminal state and a macro cell CRE terminal state, and the small size in the macro cell. Measurement reporting conditions for initiating handover to a cell may be set.
  • the macro base station 910 when the macro base station 910 specifies the measurement report condition for dividing the macro cell non-CRE terminal and the macro cell CRE terminal, the macro base station 910 provides the measurement report conditions to the macro terminal and the example of Table 3 below. Likewise, it can be set using A3 event.
  • Mmacro is the RSRP (Reference Symbol Received Power) of the macro cell
  • Mpico is the RSRP of the small cell
  • Off is the A3-offset parameter
  • Hys is the hysteresis parameter
  • Ocp is the Cell Individual Offset (CIO) of the primary (or serving) cell. May mean the CIO of the neighbor cell.
  • parameter values in Table 3 below are differentially adjustable values according to network conditions and neighbor cell interference cancellation performance of the terminal as an example of an operation assuming 6 dB extension of the small cell region.
  • the terminal When the terminal enters the macro CRE region in the macro non-CRE region, the terminal satisfies the following measurement report conditional expression and performs a measurement report.
  • the macro base station 910 receiving the measurement report of the terminal transitions the state of the terminal, specifically, the state of the terminal transitions from the macro cell non-CRE terminal state to the macro cell CRE terminal state.
  • the macro base station 910 may add the small cell to the cell trigger list (cellTriggeredList) of the terminal.
  • the macro base station receiving the measurement report of the terminal transitions the state of the terminal, and more specifically, transitions the state of the terminal from the macro cell CRE terminal state to the macro cell non-CRE terminal state and the small cell in the cellTriggerList of the terminal. Delete it.
  • the macro base station receiving the measurement report of the terminal may control the terminal to perform handover to the small base station.
  • the macro base station 910 receiving the measurement report of the terminal maintains the macro cell CRE terminal state with respect to the terminal and adds a second small cell to cellsTriggeredList.
  • the macro base station 910 In response to the measurement report of the terminal, the macro base station 910 maintains the macro cell CRE terminal state for the terminal and deletes the second small cell from cellsTriggeredList.
  • FIG. 10 is a diagram illustrating a measurement report setting and a terminal state management method for terminal state management of a small base station according to an exemplary embodiment of the present invention.
  • the small base station sets a measurement report condition for classifying a terminal serving the small cell into a small cell non-CRE terminal and a small cell CRE terminal, and a measurement report condition for starting a handover from the small cell to a macro cell. Can be.
  • the small base station When the small base station specifies the measurement report condition for distinguishing the small cell non-CRE terminal and the small cell CRE terminal, the small base station sets the measurement report condition to the small cell terminal using the A3 event as shown in the example of Table 4 below. Can be.
  • Mmacro is the RSRP of the macro cell
  • Mpico is the RSRP of the small cell
  • Off is A3-offset
  • Hys is hysteresis
  • Ocp is the Cell Individual Offset (CIO) of the primary (or serving) cell
  • Ocn is the CIO of the neighbor cell.
  • parameter value of Table 4 is an example that can be applied differently for each cell and terminal according to network conditions and neighbor cell interference cancellation performance of the terminal as an example of an operation assuming 6 dB extension of the small cell region.
  • the terminal Upon entering the small cell CRE region from the small cell non-CRE region, the terminal satisfies the following measurement report conditional expression and performs a measurement report.
  • the small base station 910 receiving the measurement report of the terminal transitions the state of the terminal, and more specifically, the state of the terminal transitions from the small cell CRE terminal state to the small cell non-CRE terminal state.
  • the terminal when the small cell CRE terminal configured according to Table 4 enters the small cell non-CRE region from the small cell CRE region, the terminal satisfies the following measurement reporting equation and performs a measurement report. do.
  • the small base station 1010 receiving the measurement report of the terminal transitions the state of the terminal, and more specifically, transitions the state of the terminal from the small cell CRE terminal state to the small cell non-CRE terminal state.
  • the small cell CRE terminal configured according to Table 4 when the small cell CRE terminal configured according to Table 4 enters the non-CRE region of the macro cell from the CRE region, the following measurement report expression is satisfied and the measurement report is performed.
  • the small base station 1010 receiving the measurement report of the terminal may control the terminal to perform a handover to the macro base station 1020.
  • the first small cell 1010 CRE terminal configured according to Table 4 enters the second small cell CRE region from the second small cell 1030 CRE region. Satisfy the equation and perform a measurement report.
  • the macro base station 1020 receiving the measurement report of the terminal may control the terminal to perform a handover to the macro base station 1020.
  • the macro base station and the small base station may receive the scheduling result of the radio packet scheduler as an input and calculate load information of the own cell. Since the cell load information calculation method may be out of the scope of the present invention, a detailed description thereof will be omitted.
  • the macro base station and the small base station collect and manage the load information of the weekly cell received from the neighboring cell and the self cell load information received from the cell load calculator.
  • FIG. 11 is a diagram illustrating a schematic load balancing operation of a macro base station and a small base station according to an embodiment of the present invention.
  • the macro base station determines the ABS ratio 1120 at predetermined cycles and macro CRE at predefined cycles. It may be determined 1130 whether to perform load balancing handover to the small base station for the UE.
  • the small base station may determine whether to perform a load balancing handover of the small cell CRE UE to the macro base station at a predetermined period.
  • FIG. 12 is a diagram illustrating an example of a method for calculating an ABS ratio of a macro base station according to an embodiment of the present invention.
  • the macro base station determines whether ABS is performed or not. If the condition including the eICIC function activation, etc. is satisfied, the macro base station determines whether ABS is performed or not. When the macro base station performs ABS, the macro base station and the small base station determine whether offloading is performed through load balancing handover.
  • ABS ratio it is determined whether ABS is performed or not based on information including the cell load of the macro cell, the cell load of the small cell, and the CRE terminal ratio of the macro base station.
  • the load of the macro base station is greater than or equal to the predefined THM0
  • the load of the small base station is less than or equal to the predefined THP0
  • the CRE terminal ratio of the macro base station is greater than or equal to THCRE, 1, it is determined to perform ABS at a predetermined ABS ratio.
  • the macro base station may perform the operation every predefined period T0.
  • the macro base station may determine the ABS ratio from information including the number of terminals for each terminal state and the load for each cell.
  • the macro base station may not perform ABS when the load of the macro base station is less than or equal to the predefined THM1 and the load of the small base station is less than or equal to THP1.
  • the macro base station may periodically perform the operation every predefined time T1.
  • the macro base station selects a predefined ABS pattern corresponding to the ABS rate.
  • FIG. 13 is a diagram illustrating a handover determination method for load balancing between a macro base station and a small base station according to an embodiment of the present invention.
  • the macro base station determines whether a load balancing handover is required for the macro cell CRE terminal to the eICIC partner small cell. To judge.
  • the macro base station determines whether to perform a load balancing handover from information including the load degree of the macro base station and the load degree of the small base station. As an example, if the load of the macro base station is greater than THM2 1310 and the load of the small base station is less than THP2 1320, the macro base station may perform a load balancing hand error from the macro cell CRE terminal to the small base station. The macro base station may perform the above operation periodically at a predefined time T2.
  • the small base station needs a load balancing handover of the small cell CRE terminal to the eICIC partner small cell when the conditions including whether the eICIC function is activated, whether there is an eICIC partner cell, presently applied ABS ratio, and whether there is a small cell CRE terminal are satisfied. Determine whether or not.
  • the small base station determines whether to perform load balancing handover from the information including the load degree of the small base station and the load degree of the macro base station.
  • the small base station may perform a load balancing hand error from the small cell CRE terminal to the macro base station.
  • the small base station may perform the above operation periodically.
  • FIG. 14 is a flowchart illustrating a load handover operation procedure of a macro base station and a small base station according to an embodiment of the present invention.
  • the macro base station may determine the load balancing handover of the macro cell CRE terminal to the small base station.
  • step S1420 the macro base station requests a measurement report to any one or more of the macro cell CRE terminal.
  • step S1430 the macro base station that has received the measurement report from the terminal selects one or more terminals to perform load balancing handover from among the terminals that have received the measurement report.
  • the macro base station may control the terminal to perform handover to the small cell.
  • the CRE small cell load of the terminal may be limited to a terminal having a predefined THP2 or less.
  • the macro base station may select the order of the largest RSRP for the small base station.
  • the macro base station is a small terminal having the largest RSRP for each terminal.
  • the base station may be selected and the terminal may be selected in order of the largest terminal.
  • the small base station may determine the load balancing handover of the small cell CRE terminal to the macro base station.
  • the small base station requests the measurement report to any one or more of the small cell CRE terminal.
  • the small base station Upon receiving the measurement report from the terminal, the small base station selects one or more terminals to perform load balancing handover among the terminals that have received the measurement report.
  • the small base station hands over the terminal to the macro cell.
  • the macro base station having the largest measurement report value may be limited to the case where the macro base station is the eICIC partner of the small base station.
  • the 15 illustrates an example of operations and message flows of the macro base station 1510, the small base station 1520, and the terminal 1530 when performing load balancing handover from the macro base station to the small base station according to an embodiment of the present invention. to be.
  • the macro base station 1510 may determine whether to hand over the macro cell terminal to the small cell 1520 for load balancing.
  • the macro base station 1510 selects one or more arbitrary terminals 1530 among the macro cell CRE terminals in step S1510.
  • the macro base station 1510 transmits an RRC message for an RRCConnectionReconfiguration to the terminal 1530 and requests the terminal to perform a measurement report.
  • step S1525 the terminal 1530 receiving the message transmits an RRC message for a measurement report including measurement information about neighbor cells to the macro base station 1510.
  • step S1530 the macro base station 1510 selects a load balancing handover target terminal based on neighbor cell measurement value information in the measurement report RRC message received from each terminal 1530.
  • step S1535 the macro base station 1510 requests the terminal 1530 to handover to the small base station 1520 by transmitting a HandoverRequest X2 message to the small base station 1520 subject to the handover.
  • the small base station 1520 Upon receiving the message, the small base station 1520 transmits a HandoverRequestAcknowledgement X2 message to the macro base station 1510 when it is determined that the service can be provided to the terminal 1530.
  • the macro base station 1510, the small base station 1520, and the terminal 1530 perform a handover execution and a handover completion procedure in steps S1545 and S1550 following the above procedure.
  • the macro base station inter-cell interference coordination includes: calculating magnetic cell load information, collecting magnetic and neighbor cell load information, determining an ABS ratio, determining an ABS pattern; And performing wireless packet scheduling according to the ABS pattern.
  • the macro base station receives the scheduling result of the radio packet scheduler as an input and calculates load information of its own cell.
  • the cell load information may be calculated based on information including a radio resource usage rate.
  • the macro base station collects and manages the load information of the weekly cell received from the neighboring cell and the self cell load information received from the cell load calculator.
  • the macro base station may determine to include an ABS ratio from information including macro cell load information, small cell load information, and macro cell CRE terminal ratio.
  • the macro base station determines an ABS pattern corresponding to the ABS ratio determined through the above process.
  • the macro base station delivers to the eICIC partner small base station through an X2 message including ABS pattern information and measurement subset information determined through the above process.
  • the macro base station performs radio packet scheduling in consideration of the ABS pattern determined through the above process.
  • the signal and channel transmitted by the ABS and the signal and channel not transmitted by the ABS follow a predefined rule.
  • a method for coordinating interference between cells by a small base station may include calculating magnetic cell load information, collecting magnetic and neighbor cell load information, and receiving ABS pattern information through an X2 message received from an ICIC partner base station.
  • a process for performing wireless packet scheduling in consideration of an ABS pattern is included.
  • the small base station receives the scheduling result of the radio packet scheduler as an input and calculates load information of its own cell.
  • the cell load information may be calculated based on radio resource utilization information.
  • the small base station collects and manages the load information of the weekly cell received from the neighboring cell and the self cell load information received from the cell load calculator.
  • the small base station performs radio packet scheduling in consideration of the ABS pattern of the eICIC partner macro base station.
  • the small base station mitigates macro cell interference for the terminal by first allocating radio resources of a protected subframe corresponding to the ABS to a terminal having a large interference from the macro base station in the radio packet scheduling process.
  • the small base station instructs the terminal serving as the serving base station to perform measurement resource restriction.
  • the small base station receives the scheduling result of the radio packet scheduler as an input and calculates load information of its own cell.
  • the small base station delivers the magnetic cell load information to the eICIC partner macro base station via an X2 message.
  • FIG. 16 is a diagram illustrating a concept of an integrated load balancing method in which a load balancing handover and a CRE region adjustment are combined according to an embodiment of the present invention.
  • FIG. 16 an example of an operation of combining the above-described "method using distributed load handover” and “small cell extension region adjustment method” will be described with reference to FIGS. 8 to 15.
  • the macro base station 1610 manages a terminal having a macro base station as a serving base station by classifying a macro cell CRE terminal state and a macro cell non-CRE state.
  • the macro base station 1610 is a 'macro cell non-CRE region' of the entire macro cell region except for the region from the small cell center to the maximum CRE outer boundary 1615 of the small cell.
  • the macro base station 1610 is a 'macro cell CRE area' of the area from the 'maximum CRE outer boundary of the small cell' 1615 to 'current CRE outer boundary of the small cell' 1620, the terminal located in the area
  • the state of is defined as 'macro cell CRE terminal state' (1619).
  • the small base station 1630 divides and manages a terminal having the small base station as a serving base station into a small cell CRE terminal state and a small cell non-CRE state.
  • the small base station 1630 defines the cell area before the small cell extension as the "small cell non-CRE area” as the "small cell non-CRE terminal state" (1632).
  • the small base station 1630 is a 'small cell CRE area' to the area from the 'cell area boundary before the small cell expansion' to the 'current CRE outer boundary' 1620 as the 'small cell CRE area' and the state of the terminal located in the corresponding area 'small cell' CRE region terminal state '1635.
  • the macro base station 1610 and the small base station 1630 commonly define an area as a common service area 1640 from the current small cell CRE outer boundary to the macro cell CRE area outer boundary.
  • the macro base station 1610 sets two measurement report A3-events for the measurement report to a terminal having the macro base station as the serving base station.
  • the boundary is a boundary at which the UE performs handover from the macro cell to the small cell.
  • the small base station 1630 sets two measurement report A3-events for the measurement report to a terminal having the small base station as the serving base station.
  • the boundary is used by the small base station 1630 to distinguish the terminal into a small cell non-CRE terminal and a small cell CRE terminal.
  • Mmacro is the macro cell RSRP
  • Mpico is the pico cell RSRP
  • CRE_offset_max is the maximum cell range extension applicable to the small cell
  • CRE_offset_current is the cell area extension currently applied to the small cell
  • Off is A3-offset.
  • the small base station 1630 divides and manages a terminal having the small base station as a serving base station into a small cell CRE terminal state and a small cell non-CRE state.
  • the macro base station 1610 may limit the area where the small cell CRE terminal is located to a part of the CRE area.
  • the network is defined as a common service area 1640 in an area in which the macro cell CRE UE and the small cell CRE UE are co-located.
  • the macro base station 1610 determines the common service area terminal from the macro cell CRE terminal when load balancing handover is required.
  • a load balancing handover target terminal is selected among common service area terminals among macro base stations.
  • the macro base station performs load balancing handover.
  • FIG. 17 is a flowchart illustrating a process of performing load balancing between integrated cells by combining load balancing handover and CRE region adjustment of a macro base station and a small base station according to an embodiment of the present invention.
  • step S1710 the base station initializes the counter Cnt to zero.
  • step S1720 the base station determines whether the base station is overloaded from information including its cell load information.
  • step S1730 If it is determined that the overload condition, the base station proceeds to step S1730. On the other hand, if it is determined that the steady state, the base station repeats the step S1720 again.
  • the base station determines whether load balancing handover can be performed as described above with reference to FIG. 13. If the condition is satisfied, the base station proceeds to step S1740. On the other hand, if the condition is not satisfied, the base station proceeds to step S1750.
  • step S1740 the base station performs a load balancing handover operation, and may move back to step S1720.
  • the base station proceeds to step S1750, and increases the counter Cnt by one.
  • the base station proceeds to step S1760, and determines whether the value of Cnt exceeds the predefined parameter THcnt.
  • step S1770 the base station proceeds to step S1770 to perform the small cell extension area change request operation. Otherwise, the base station moves to step S1720.
  • step S1770 that is, in the small cell extension area change request operation, the macro base station requests the small cell area extension, and the small base station requests the small cell area reduction.
  • FIG. 18 illustrates a load balancing handover procedure of a base station in a load balancing operation procedure between integrated cells in which load balancing handover and CRE region adjustment are combined according to an embodiment of the present invention.
  • the macro base station may determine to perform a handover for load balancing the macro cell CRE terminal to the small base station.
  • the macro base station requests a measurement report to any one or more of the macro cell CRE terminal.
  • the macro base station distinguishes the common service area terminal from the received measurement report.
  • the common service area terminal is a macro terminal satisfying Mmacro + Off> Mpico + CRE_offset_current and Mmacro ⁇ Mpico + Off + CRE_offset_current.
  • step S1840 the macro base station selects one or more terminals to perform measurement reporting and load balancing handover among the common service area terminals.
  • the macro base station controls the terminal to handover to the small cell.
  • the macro base station may limit the CRE small cell load of the terminal to a terminal having a predefined THP2 or less.
  • the macro base station may select the order of the largest RSRP for the small base station.
  • a terminal is a macro cell CRE terminal for a plurality of small cells
  • the macro base station has an RSRP for each terminal.
  • the large small base station may be selected, and the value of each terminal may be selected in order of the largest terminal.
  • the small base station may determine to perform a handover for load balancing the small cell CRE terminal to the macro base station.
  • step S1820 the small base station requests the measurement report to any one or more of the small cell CRE terminal.
  • step S1830 the small base station identifies the common service area terminal from the received measurement report.
  • the common service area terminal is a small cell terminal that satisfies Mmacro + Off> Mpico + CRE_offset_current and Mmacro ⁇ Mpico + Off + CRE_offset_current.
  • step S1840 the small base station selects one or more terminals to perform measurement reporting and load balancing handover among the common service area terminals.
  • the small base station may control the terminal to handover to the macro cell.
  • the macro base station having the largest measurement report value may be limited to an eICIC partner of the small base station.
  • the terminal of the present invention may include a transceiver 1910 and a controller 1920.
  • the transceiver 1910 may transmit and receive a signal by forming a wireless channel with a base station.
  • the controller 1920 controls the signal flow between blocks so that the terminal can operate according to an embodiment of the present invention.
  • the controller 1920 may control to receive the measurement report setting message from the macro base station or the small base station. Subsequently, the controller 1920 may detect entry or departure into the spare area for the small base station. The controller 1920 may perform a measurement according to the setting of the measurement report setting message and then control the measurement result to be transmitted to the macro base station or the small base station.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil pour distribuer une charge entre des cellules et atténuer les interférences dans un système de communication sans fil. Le procédé pour distribuer une charge entre des cellules par une première station de base dans un système de communication sans fil de réseau hétérogène comprenant la première station de base et une seconde station de base afin de résoudre le problème précité, consiste à établir une zone réservée à la seconde station de base de manière à distribuer une charge entre les cellules, et à gérer un terminal en fonction de la zone réservée.
PCT/KR2015/000879 2014-01-28 2015-01-28 Procédé et appareil pour distribuer une charge entre des cellules, et atténuation d'interférences dans un système de communication sans fil WO2015115784A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2016549125A JP6704347B2 (ja) 2014-01-28 2015-01-28 無線通信システムでセル間の負荷分散及び干渉緩和のための方法及び装置
US15/114,626 US10999774B2 (en) 2014-01-28 2015-01-28 Method and apparatus for inter-cell load distribution and interference mitigation in wireless communication system
CN201580006389.3A CN106105286B (zh) 2014-01-28 2015-01-28 用于无线通信系统中的小区间负载分布和干扰抑制的方法和装置
EP15744012.4A EP3101936B1 (fr) 2014-01-28 2015-01-28 Procédé et appareil pour distribuer une charge entre des cellules, et atténuation d'interférences dans un système de communication sans fil

Applications Claiming Priority (4)

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US201461932513P 2014-01-28 2014-01-28
US61/932,513 2014-01-28
KR10-2014-0040220 2014-04-03
KR1020140040220A KR102226464B1 (ko) 2014-01-28 2014-04-03 무선 통신 시스템에서 셀 간 부하 분산 및 간섭 완화를 위한 방법 및 장치

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