WO2011087212A2 - Appareil et procédé destinés à configurer une porteuse de composants dans un système de communication sans fil - Google Patents

Appareil et procédé destinés à configurer une porteuse de composants dans un système de communication sans fil Download PDF

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Publication number
WO2011087212A2
WO2011087212A2 PCT/KR2010/008841 KR2010008841W WO2011087212A2 WO 2011087212 A2 WO2011087212 A2 WO 2011087212A2 KR 2010008841 W KR2010008841 W KR 2010008841W WO 2011087212 A2 WO2011087212 A2 WO 2011087212A2
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cell
information
preferred
terminal
priority
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PCT/KR2010/008841
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English (en)
Korean (ko)
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WO2011087212A3 (fr
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김기태
안재현
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주식회사 팬택
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Priority claimed from KR1020100053057A external-priority patent/KR20110083455A/ko
Application filed by 주식회사 팬택 filed Critical 주식회사 팬택
Priority to US13/518,326 priority Critical patent/US8811268B2/en
Publication of WO2011087212A2 publication Critical patent/WO2011087212A2/fr
Publication of WO2011087212A3 publication Critical patent/WO2011087212A3/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

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to an apparatus and method for configuring a component carrier for determining a preferred CC including at least one CC.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution Advanced
  • Communication system The next generation communication system is not only required to develop a technology capable of transmitting a large amount of data corresponding to a wired communication network, but also minimizes the reduction of information loss and increases the system transmission efficiency, thereby making it possible to improve system performance. There is a demand for a detection method.
  • HetNet heterogeneous network
  • the HetNet means a communication system in which a second network node exists in a coverage area of a first network node in the same communication system.
  • a macro cell which means a general cell, and a smaller cell, a micro cell or a pico cell, a hot spot, or a relay node.
  • a communication system composed of a Node) or a Femto Cell may be assumed.
  • at least one femto cell may support a terminal under the control of a femto base station (Femto BS), the femto base station may be named a home base station (Home eNodeB).
  • small coverage cells existing inside a macro cell such as a micro cell, pico cell, hot spot or femto cell, are limited in their transmission power.
  • ICI inter-cell interference
  • pico cells and the like have a potential of rapidly changing the inter-cell interference ratio due to various environmental factors of the macro cell.
  • An object of the present invention is to provide an apparatus and method for determining a preferred component carrier including at least one component carrier in a wireless communication system.
  • the present invention also provides an apparatus and method for configuring a component carrier for a second station considering the first station in a wireless communication system.
  • Another object of the present invention is to provide an apparatus and method for determining a preferred CC for use by a first station and a second station in a wireless communication system using a plurality of CCs.
  • the present invention also relates to an apparatus and method for configuring a preferred component carrier (Preferred CC) for use by a second station that is within coverage of a first station in a wireless communication system.
  • Preferred CC preferred component carrier
  • the present invention also provides an apparatus and method for determining a preferred component carrier to be used by a second station on the basis of usage information for each component carrier of an adjacent first station in a wireless communication system having a first station and a second station. I would like to.
  • the present invention is to provide an apparatus and method for configuring a CC using the priority information for each CC received by the receiving device linked to the second station in a wireless communication system having a first station and a second station. .
  • the present invention is to provide an apparatus and method for determining the priority of the CC in consideration of the received signal power for each CC in a wireless communication system.
  • the present invention is to provide an apparatus and method for changing the priority information for the CC in consideration of the received signal power for each CC in a wireless communication system.
  • a method of performing interference coordination in a multi-component carrier system may further include receiving usage information regarding a component carrier (hereinafter referred to as CC) assigned to a first cell, and preferentially assigning the second cell based on usage information regarding a CC allocated to the first cell. Determining a preferred CC including at least one CC, and transmitting information on the preferred CC including the at least one CC to the terminal.
  • CC component carrier
  • an apparatus for performing interference coordination in a multi-component carrier system preferentially transmits to a second cell in consideration of a transmitting / receiving unit for receiving usage information about a component carrier (hereinafter referred to as CC) assigned to the first cell and usage information about a CC assigned to the first cell. And a determining unit for determining a preferred CC including at least one CC to be allocated.
  • CC component carrier
  • a method of performing interference coordination in a multi-component carrier system may include determining a preferred CC including at least one CC to be preferentially allocated to a second cell in consideration of usage information on a CC assigned to the first cell, and indicating the determined preferred CC. And transmitting the preferred CC information to the second cell.
  • an apparatus for performing interference coordination in a multi-component carrier system may include a preferred CC determiner configured to determine a preferred CC including at least one CC to be preferentially allocated to a second cell in consideration of usage information on a CC allocated to a first cell, and the determined preference. And a transmitter in the second cell for transmitting preferred CC information indicating a CC.
  • a method for performing interference coordination by a terminal in a multi-component carrier system may further include receiving, from the base station, information about a preferred CC including at least one CC to be preferentially assigned to the second cell based on usage information about the CC allocated to the first cell. Determining priority of CCs to be used by the terminal in consideration of information on a preferred CC including, and at least one CC configuration request according to the identified priority, to at least one CC to be used Requesting at least one of a resource allocation request for the resource allocation request and a change request of a preferred CC to the base station.
  • a terminal for performing interference coordination in a multi-component carrier system is provided.
  • the terminal is a preferred CC information receiving unit for receiving information on the preferred CC including at least one CC to be preferentially allocated to the second cell based on the usage information about the CC assigned to the first cell, the at least one CC
  • CC configuration unit for checking the priority of the CC to be used by the terminal, and according to the identified priority, at least one CC configuration request or use
  • a resource allocation unit for transmitting at least one request to the base station to the base station of the step of requesting resource allocation for at least one CC, or request to change the preferred CC.
  • a plurality of CCs can be efficiently operated while reducing intercell interference (ICI) and improving transmission efficiency.
  • ICI intercell interference
  • FIG. 1 is a diagram schematically illustrating a wireless communication system to which an embodiment of the present invention is applied.
  • FIG 2 shows an example of HetNet to which the present embodiment can be applied.
  • FIG 3 shows an example of a component carrier that can be used in the present invention.
  • FIG. 4 is a diagram illustrating different coverage for each component carrier to which the present invention is applied.
  • FIG. 5 is a view illustrating a concept of setting a preferred CC set in consideration of service coverage according to the present invention.
  • FIG. 6 is a view illustrating a concept of setting a preferred CC set in consideration of the load ratio according to the present invention.
  • FIG. 7 is a view illustrating a concept of setting a preferred CC set in consideration of service support according to the present invention.
  • FIG 8 shows an example of a HetNet system configuration to which the present invention is applied.
  • FIG. 9 is a flowchart for determining a preferred CC set according to the present invention.
  • FIG. 10 illustrates a flow of determining preferred CC set by receiving usage information for each CC according to the present invention.
  • FIG. 11 is a functional block diagram of an apparatus for determining a preferred component carrier set according to an embodiment of the present invention.
  • 12 and 13 are flowcharts illustrating an operation of a receiving apparatus connected to a second station included in coverage of one or more first stations according to an embodiment of the present invention.
  • FIG. 14 is a block diagram of a receiving apparatus to which the present embodiment is applied.
  • a station may refer to a fixed communication device or a mobile communication device constituting a communication node existing within the same communication system.
  • the fixed communication device may be a fixed network node such as a base station (BS), a macro base station (macro BS), a pico base station (pico BS), a relay node, a femto BS or a home BS.
  • the mobile communication device includes a communication node having mobility, such as a user equipment (UE), a mobile station, and the like.
  • the first station may be a communication node existing in the LTE system
  • the second station may include a device supporting a Bluetooth or 802.11 (WLAN) system.
  • Each station includes a fixed or mobile communication device.
  • the present invention provides efficient inter-cell interference coordination in consideration of a case where not only inter-cell interference between nodes in a heterogeneous network in a homogeneous communication system but also inter-device interference between network devices can occur in a wireless communication system.
  • a user terminal is a network node in an LTE and LTE-A communication system, and a communication system (e.g., a microphone, a printer, a mouse, etc.) wirelessly connected to the user terminal in a Bluetooth manner is connected in an 802.11 manner.
  • a communication system e.g., a microphone, a printer, a mouse, etc.
  • 802.11 manner 802.11 manner.
  • FIG. 1 illustrates a wireless communication system to which embodiments of the present invention are applied.
  • Wireless communication systems are widely deployed to provide various communication services such as voice and packet data.
  • a wireless communication system includes a user equipment (UE) 10 and a base station 20 (BS).
  • the terminal 10 and the base station 20 are applied with a preferred component carrier (CC) determination technique as described in the following embodiments.
  • Terminal 10 in the present specification is a generic concept that means a user terminal in wireless communication, WCDMA, UE (User Equipment) in LTE, HSPA, etc., as well as MS (Mobile Station), UT (User Terminal) in GSM ), It should be interpreted as a concept that includes all the communication nodes such as SS (Subscriber Station), wireless device (wireless device).
  • a base station 20 or a cell generally refers to a fixed station communicating with the terminal 10 and includes a Node-B, an evolved Node-B, and a Base Transceiver. It may be called other terms such as a System, an Access Point, a Relay Node, and the like.
  • the base station will be defined as an eNB.
  • the eNB 20 or the cell should be interpreted in a comprehensive sense indicating some areas covered by the base station controller (BSC) in the CDMA, the NodeB of the WCDMA, and the like.
  • BSC base station controller
  • the term encompasses various coverage areas of network nodes such as micro cells, pico cells, hot spots, femto cells, and relay nodes.
  • the terminal 10 and the eNB 20 are two transmitting and receiving entities used to implement the technology or technical idea described in the present specification and are used in a comprehensive sense and are not limited by the terms or words specifically referred to. .
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • OFDM-FDMA OFDM-FDMA
  • OFDM-TDMA OFDM-TDMA
  • OFDM-CDMA OFDM-CDMA
  • the uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.
  • TDD time division duplex
  • FDD frequency division duplex
  • One embodiment of the present invention is resource allocation in the fields of asynchronous wireless communication evolving into Long Term Evolution (LTE) and LTE-advanced through GSM, WCDMA, HSPA, and synchronous wireless communication evolving into CDMA, CDMA-2000 and UMB.
  • LTE Long Term Evolution
  • GSM Global System for Mobile communications
  • WCDMA High Speed Packet Access
  • HSPA High Speed Packet Access
  • CDMA Code Division Multiple Access-2000
  • UMB Universal Mobile Broadband
  • a wireless communication system to which an embodiment of the present invention is applied may support uplink and / or downlink HARQ, and may use a channel quality indicator (CQI) for link adaptation.
  • CQI channel quality indicator
  • multiple access schemes for downlink and uplink transmission may be different. For example, downlink uses Orthogonal Frequency Division Multiple Access (OFDMA), and uplink uses Single Carrier-Frequency Division Multiple Access (SC-FDMA). ) Is the same as can be used.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • the layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) model, which are well known in communication systems.
  • the physical layer may be divided into a second layer L2 and a third layer L3, and the physical layer belonging to the first layer provides an information transfer service using a physical channel.
  • one radio frame may include 10 subframes, and one subframe may include two slots. .
  • the basic unit of data transmission is a subframe unit, and downlink or uplink scheduling is performed on a subframe basis.
  • One slot may include a plurality of OFDM symbols in the time domain and at least one subcarrier in the frequency domain, and one slot may include 7 or 6 OFDM symbols.
  • each time slot may include seven symbols in the time domain and twelve sub-carriers in the frequency domain.
  • the frequency domain may be referred to as a resource block (RB), but is not limited thereto.
  • one of the communication systems currently used uses one carrier having a constant frequency bandwidth (up to 20 MHz), and in such a wireless communication system, system information (SI) of one component carrier is transmitted as a corresponding component carrier.
  • SI system information
  • CC component carrier
  • component carriers in addition to the frequency band allocated for the LTE system, up to five 20 MHz component carriers can be extended to have a bandwidth of up to 100 MHz, and thus, at least one component carrier (Component Carrier) A technology that can be bundled and used is called carrier aggregation technology (hereinafter referred to as 'CA').
  • 'CA' carrier aggregation technology
  • the number of CCs available for CA may be five or more depending on service extension.
  • a frequency band that can be allocated to the component carrier may be continuous or discontinuous.
  • a plurality of component carriers may be classified into three types: backwards compatible carrier, non-backwards compatibility carrier, and extension carrier, depending on characteristics. It can be divided into.
  • a compatible carrier (referred to as “backwards compatible carrier” or “BC” or “BC”) is a carrier that can be applied to all existing versions of LTE, and may operate as a single (single) carrier or a carrier aggregation. It can also act as part of).
  • BC backwards compatible carrier
  • FDD frequency division duplex
  • non-backwards compatibility carrier or “non-compatible carriers” or “NBC”
  • NBC non-compatible carriers
  • an extension carrier (hereinafter referred to as an extension carrier or “extension carrier” or “ExC”) may not be operated singly (only) and is used only as part of at least one component carrier set including a carrier that can be used alone. It is a carrier wave used only for bandwidth expansion.
  • the compatible carrier (BC) or incompatible carrier (NBC) may maintain a Radio Resource Control (RRC) _IDLE state or an RRC_CONNECTED state, in particular can be fully connected in the RRC_CONNECTED state. Even in the RRC_IDLE state, some system information may be received and maintained in a state capable of accessing a corresponding carrier (CC or CELL).
  • RRC Radio Resource Control
  • HetNet includes not only network nodes of a network in which various communication systems are mixed, but also a comprehensive system including a network system of a cell structure having network nodes of a network composed of multiple layers. It should be interpreted as meaning.
  • FIG 2 shows an example of HetNet to which the present embodiment can be applied.
  • the network nodes constituting the system include macro cells having long coverage and short coverage femto existing within the coverage of the macro cells.
  • Cells Femto Cell
  • a femto cell is used as a generic term for all cells or network nodes having a smaller coverage than a macro cell such as a micro cell, a pico cell, a hot spot, a femto cell, a relay node, and thus, a broader meaning than the general meaning of the term. It should be interpreted in a comprehensive sense.
  • the femto cell corresponds to the coverage of the femto eNB or home eNB. In general, femto cells among network nodes have narrower service coverage than macro cells due to the limitation of transmission power.
  • the time resource or the frequency resource should be restricted for a cell such as a femto cell or a pico cell having a lower priority of band allocation than the macro cell, and the macro cell is considered an aggressor cell.
  • the constrained femto cell, or pico cell is considered a victim cell.
  • FIG 3 shows an example of a component carrier that can be used in the present invention.
  • each component carrier is defined as a maximum of 20 MHz, and each component carrier is one of three types of the above-described compatible carrier, incompatible carrier, and extended carrier, and a femto cell having a narrow RF coverage is also LTE-A. It can operate in the CA mode of the system, and can additionally use multiple CCs as needed.
  • a UE in each cell may configure a UE-specific CC set
  • a Radio Resource Control (RRC) connection may be configured with a configured CC set.
  • RRC Radio Resource Control
  • a carrier indicator of 3 bits may be used to distinguish each CC.
  • the carrier indicator (carrier indicator) may be represented with an 8-bit length in a field determined in one-to-one correspondence with each CC.
  • a UE receiving a service from the femto cell may also configure a UE-specific CC set.
  • inter-cell interference control is a factor directly affecting the performance of the femto cell.
  • CCs component carriers
  • a UE receiving a service from a femto cell may have to follow a procedure such as frequent component carrier change or resource reallocation due to different inter-cell interference for each carrier.
  • a component carrier may be defined continuously or discontinuously due to a structural characteristic of adding a component carrier according to a situation. Therefore, since the center frequency and the set bandwidth may be different for each component carrier, propagation characteristics may also be different for each component carrier.
  • FIG. 4 is a diagram illustrating different coverage for each component carrier to which the present invention is applied.
  • a femto eNB and a UE when a femto eNB and a UE form a link for the first time, the UE selects one of the previously visited allowed closed subscribed group (CSG) cells through an autonomous search to establish a link. It is supposed to form.
  • CSG closed subscribed group
  • a femto cell since a CC configuration procedure is additionally required in a communication system using a plurality of CCs, a femto cell also needs such a CC configuration procedure.
  • the femto cell may also follow the same series of procedures. Considering such a situation, when a femtocell is operated in a communication system using a plurality of CCs, interference between cells may occur, and such problems may be summarized as follows.
  • intercell interference is a factor of intercell interference of a macro cell. More specifically, it may be determined by factors such as setting of a CC set that may be different for each UE, a load rate that may be different for each CC (number of users per CC or frequency band occupancy of users by CC), and propagation characteristics that may be different for each CC. Interference occurs between macro cells.
  • interference from the macro cell may be different for each component carrier, and services from the femto eNB may be caused by the interference of the macro cell.
  • the receiving UE is likely to perform a procedure such as frequent CC change or resource reallocation.
  • various deployment scenarios considered in femto cells are related to inter-cell interference coordination (ICIC), and UE-specific considering inter-cell interference using multiple CCs.
  • IOC inter-cell interference coordination
  • UE-specific considering inter-cell interference using multiple CCs.
  • a method for determining a preferred component carrier set to be used by a second cell included in coverage of one or more first cells in such a HetNet system includes a CC of the one or more first cells adjacent to the second cell. It is intended to include a configuration for receiving the respective usage information, and determines the preferred CC to be used by the second cell based on the received priority for each CC.
  • the usage information for each CC is detailed usage information for each CC which is one or more of coverage information for each CC of the neighboring first cell, load information for each CC, and support CC availability information, and the preferred CC determines the received CC.
  • the priority of the CC is given by using at least one of the third methods of giving priority to the unsupported CC of the first cell. Then, the preferred CC can be determined accordingly.
  • the usage information for each CC is priority information for each CC for each first cell, and the determining of the preferred CC may determine the preferred CC according to the priority information for each CC.
  • a cell is used in terms of terms such as a station or a network node, or a macro cell and a femto cell, and the plurality of cells may be cells of a homogeneous communication system or cells of different heterogeneous communication systems. It is to be understood that the term is not limited to the general meaning and refers to some or all of the communication elements of various coverages.
  • a macro cell or a macro eNB as an example of a first cell or a first station
  • a femto cell or a femto eNB as an example of a second cell or a second station
  • the present invention is not limited thereto, but may be applied to a communication environment in which cells / stations of a communication system having a homogeneous network using various component carriers or devices of a communication system having a heterogeneous network are mixed.
  • 5 to 7 illustrate the first to third schemes applied to determine the preferred component carrier set of the second cell (femto cell) from the usage information for each component carrier of the first cell (macro cell) according to the present invention. It is a figure explaining a concept and a principle.
  • FIG. 5 is a view illustrating a concept of setting a preferred CC set in consideration of service coverage according to the present invention.
  • the first method of the present invention is to select a preferred component carrier of a second cell in consideration of an order of component carriers having a long coverage among a plurality of component carriers set in the first cell.
  • the femto cell may be located in an area that may be greatly affected by inter-cell interference from the macro cell.
  • Cross-carrier scheduling can be applied for such a communication environment.
  • the preferred CC set of the femto cell may be set by using the difference in service coverage that may occur due to different propagation characteristics of the CC. That is, by preferentially using a CC having short service coverage of the macro cell in the femto cell, interference from the macro cell can be avoided with a certain probability according to the position of the femto cell eNB.
  • the coverage of CC3 is the shortest and the coverage of CC1 is the longest among the set CCs of the macro cell eNB.
  • the femto cell HeNB configures a preferred CC set with a priority of CC configuration in the order of CC3 ⁇ CC2 ⁇ CC1.
  • service coverage among CC-use information of a macro cell may be defined in the following three ways, but is not limited thereto.
  • a service coverage is defined using the same SINR-based distribution area information of a macro cell, wherein the eNB of the macro cell has a long-term averaged SINR distribution using the location-based SINR information of the UE. Can be estimated.
  • the service coverage area may be defined using a transmission power attenuation distribution.
  • the service coverage area may be defined using channel quality index (CQI) information and location information of the UE reported to the eNB of the macro cell.
  • CQI channel quality index
  • FIG. 6 is a view illustrating a concept of setting a preferred CC set in consideration of the load ratio according to the present invention.
  • the second method of the present invention is to select a preferred component carrier of a second cell in order of component carriers having a low load factor among a plurality of component carriers set in the first cell.
  • a plurality of CCs may be used at the same time, but users are not always evenly distributed to all CCs. That is, the UE of the macro cell may be concentrated or distributed in a specific CC in some cases.
  • a CC that is configured as a backward-compatible (BC) carrier and simultaneously accommodates an existing LTE UE and an LTE-A UE, a non-backward compatible (NBC) carrier and an extension More UEs may be concentrated than carriers.
  • BC backward-compatible
  • NBC non-backward compatible
  • the load rate may differ for each CC.
  • the higher the load rate the more UEs using the CC, and since the UE can occupy more frequency bands, the femtocell can receive a lot of interference from the CC of the macro cell with a relatively high load rate.
  • the preferred CC set of the femto cell HeNB is set in the order of the low load rate among the CCs set in the macro cell eNB, interference from the macro cell can be relatively lowered.
  • the load ratio of CC1 is the highest
  • the load ratio of CC2 is the lowest
  • the load ratio of CC3 is the middle among the set CCs of the macro cell eNB
  • the femtocell HeNB is loaded in the order of low load ratio CC2 ⁇ CC3 ⁇ CC1 in order to determine the preferred CC set.
  • the CC-specific load rate set in the macro cell may be defined using at least one of the number of UEs currently distributed by CC, the size of a frequency band currently used by CC, and a transmission rate currently measured by CC, but
  • the load factor may be defined in consideration of other factors and not limited thereto.
  • FIG. 7 is a view illustrating a concept of setting a preferred CC set in consideration of service support according to the present invention.
  • the third method of the present invention preferentially selects a non-supported CC as a preferred component carrier from a plurality of component carriers.
  • the eNB may have a structure capable of providing a communication service by determining the number of CCs that can be accommodated according to the number of users or a traffic load.
  • the eNB may extend the service area by using eight component carriers.
  • the eNB may support only a certain number of CCs in consideration of the traffic load of the system, and the eNB may increase the number of supported CCs in consideration of the traffic load of the system. There will be. At this time, the supported CC may be randomly increased or may be increased in a predetermined unique order.
  • the macro cell may transmit information on the supported CC or non-supported CCs to the femto eNB.
  • the macro eNB may determine CCs supporting communication according to a traffic load in a predetermined order or randomly, CCs supporting communication for each macro eNB may be the same or different. Therefore, since CCs that do not support communication for each macro eNB do not form a link with the UE, the femtocell appears to be a zero power CC.
  • a non-supported CC among the CCs of the macro cell is defined as a preferred CC set of the femto cell, interference from the macro cell can be relatively lowered.
  • the macro cell eNB uses CC1, CC4, and CC5 as a supported CC, and CC2 and CC3 are non-supported CCs that are not used by the macro cell.
  • the CC2 and CC3, which are unsupported CCs, become CCs having no inter-cell interference (ICI) in the femto cell HeNB, and therefore, the femtocell HeNB may preferentially set CC2 or CC3 as a preferred CC set.
  • ICI inter-cell interference
  • FIG 8 shows an example of a HetNet system configuration to which the present invention can be applied.
  • the HetNet system shown in FIG. 8 includes two eNBs 800 and 805 as macro cells which are examples of the first cell or the first network node, and the second cell or second network existing within the coverage of the two eNBs.
  • An example of a node includes a HeNB (Home eNB) 810, which is a femto eNB, and an MME / SAE gateway 820, which is a core network node capable of communicating with the eNB or the HeNB, through an S1 interface.
  • HeNB Home eNB
  • MME / SAE gateway 820 which is a core network node capable of communicating with the eNB or the HeNB, through an S1 interface.
  • the present invention is not limited to the eNB, HeNB, MME / SAE gateway, etc. of FIG. 8, but may be a core network configuration other than the MME / SAE gateway.
  • the HeNB 810 may be connected to a core network (MME / SAE gateway) using, for example, HTTP, that is, the Internet network, and usage information for each component carrier transmitted from eNBs which are macro cells is illustrated in FIG. 8.
  • MME / SAE gateway a core network
  • HTTP that is, the Internet network
  • usage information for each component carrier transmitted from eNBs which are macro cells is illustrated in FIG. 8.
  • it may be delivered to the HeNB through an S1 interface or direct communication.
  • the direct communication includes broadcasting information transmitted by the macrocell eNB to the HeNB.
  • two types of communication may be performed between the eNBs 800 and 805, which are the macro cell eNBs, and the HeNB 810, which is a femtocell.
  • element carrier information is received from a macro eNB including a corresponding cluster base station through a gateway and an MME or a specific server above the local base station.
  • a gateway since it is connected to a LAN, information on a component carrier can be received by wire from a gateway or a server.
  • the usage information for each component carrier of the macro cell may be included in the broadcasting information transmitted by the eNB. This requires additional eNB-wide resource allocation, and the HeNB must include a device or a procedure capable of listening to the macrocasting broking information.
  • a method of transmitting through the terminal should be used.
  • the information is transmitted to the terminal, and the terminal will be a method of transmitting the information to the macro eNB.
  • the reverse is also possible.
  • the macro cell transmits detailed usage information for each CC to the femto cell, and the femto cell sets its own preferred CC using the detailed usage information for each CC.
  • the macro cell may determine the priority for each CC according to the first to third schemes described above, and then transmit only the priority information for each CC to the femtocell directly or through another network node.
  • each "CC-specific usage information" transmitted from a macro cell to a femtocell or a preferred CC set processing apparatus includes "CC-specific detailed usage information” such as service coverage information, load ratio information, and supported / non-supported CC information for each CC and the like.
  • CC-specific detailed usage information such as service coverage information, load ratio information, and supported / non-supported CC information for each CC and the like.
  • a macro cell, etc. is a concept including " CC priority information " which means a priority for each CC determined by one or more of the above-described first to third methods.
  • the femtocell or preferred CC set processing apparatus uses the corresponding femto for each CC using the detailed usage information for each CC.
  • the preferred CC set of the cell may be determined, which is referred to herein as the first embodiment.
  • the macro cell determines the priority for each CC suitable for a specific femto cell, calculates priority information for each CC, and delivers the priority information to a femto cell or a preferred CC set processing apparatus. It will be referred to as a second embodiment.
  • the preferred CC set determination device for determining the preferred CC set of a specific femto cell by one or more of the above-described first to third methods may be implemented in the femto cell, but is not limited thereto. It is implemented at the server level as a component.
  • the server level refers to some components of the core network that determine the preferred CC set of the femto cell by using the information transmitted from the macro cell, but is not limited to a specific component.
  • the preferred CC set determiner receives the "detailed usage information for each CC" such as service coverage information, load rate information, support / non-support CC information for each CC, directly determine the priority for each CC, and then determine the final preferred CC set Although it may be determined, only the function of determining a final preferred CC set therefrom after receiving the priority information for each CC, which means the priority for each CC determined by one or more of the first to third methods described above, by the macro cell or the like. It could be done.
  • the "detailed usage information for each CC” such as service coverage information, load rate information, support / non-support CC information for each CC
  • the service coverage of the three CCs used in the macro cell is measured in the order CC1> CC2> CC3
  • only the service coverage order of the corresponding CC is transmitted to the femtocell eNB as priority information for each CC. It may be implemented, specifically, as shown in the following example.
  • the macro cell sorts the index for each CC.
  • the CC may have a 3-bit CC index
  • the CC having a short service coverage of the macro cell has a priority of use in the femto cell eNB (HeNB). Therefore, the transmission order of each CC is classified through the CC index. For example, when the CC1 index is defined as 001, the CC2 index is 010, the CC3 index is 011, and the like, they are classified in the order of CC3-CC2-CC1.
  • the macro cell is a CC set for use by a femto cell, for example, CC3-CC2-CC1 as a preferred CC set for a femto cell, that is, '011 010 001' for each CC.
  • the priority information is transmitted to the femto eNB or the preferred CC set processing apparatus.
  • the femtocell eNB or server-level preferred CC set determination apparatus may use CC-specific usage information (CC-specific detailed usage information or CC-specific priority information, etc.) transmitted from each macro cell. ) Is used to determine the priority of each specific femtocell for each CC, and the preferred CC set is determined by randomly assigning some regions.
  • CC-specific usage information CC-specific detailed usage information or CC-specific priority information, etc.
  • the principle of determining the preferred CC set of the femto cell using the CC-specific usage information transmitted from the macro cell can be summarized as follows.
  • a CC having a shorter service coverage is set as a priority.
  • the CC having the low load factor among the CCs used in the macro cell is set as a priority. In this way, the load rates of all CCs cannot always be the same, and a certain CC assumes that no link forming UE can exist.
  • Priority is set to non-supported CC (restriction of use of macro cell). This is because, for some reason, the eNB of the macro cell does not use all CCs and can adjust the number of supported CCs in consideration of the communication environment, and the specific CCs are unsupported CCs and these unsupported CCs are the preferred CC set of the femtocell. Is set to.
  • FIG. 9 is a flowchart for determining a preferred CC set according to the present invention.
  • a preferred CC set determination of a specific femto cell will be described.
  • a method for determining a preferred component carrier to be used by a second cell included in the coverage of one or more first cells by using the preferred component carrier set determination device, wherein the one or more adjacent to the second cell are used. And receiving usage information for each CC of the first cell and determining a preferred CC to be used by the second cell based on the received usage information for each CC.
  • the preferred CC set determination device implemented in the femto cell or the server level receives the usage information for each CC of one or more macro cells adjacent to a specific femto cell (S910). .
  • the type (type) of the received CC-specific usage information is determined, and the usage information for each CC is classified according to the type (S920).
  • the type of usage information for each CC refers to a type of usage information for each CC used in the first to third methods, specifically, service coverage information for each CC, load rate information for each CC, and each It may be detailed CC-specific usage information such as information indicating whether CC is supported / non-supported or may be priority information for each CC that is already determined by the first to third schemes.
  • the preferred CC set determination apparatus adjusts or grasps the priority of the CCs to be used in the corresponding femtocell according to the type of the usage information for each CC (S930, S933, and S936), and determines the final preferred CC set (S940).
  • the process of checking the type of the usage information for each CC or classifying the usage information for each CC according to the type may be omitted.
  • the process of adjusting the priority of the CC according to the type of the usage information for each CC is described in more detail, if the usage information for each CC of the received macro cell is service coverage information, priority is given in order of shorter coverage. (S930), if the received CC-specific usage information is the CC load rate, the priority is given in order of the lower CC (S933), and if the received CC-specific usage information is the supported CC, Priority is given to the unsupported CC of the corresponding macro cell (S936).
  • the final preferred CC set is determined based on it (S940).
  • step S940 there may be some CCs having the same priority in some cases.
  • the preferred CC set may be finally determined by setting the priority of the CCs in random or index order.
  • a “preferred component carrier (CC) set” means a set of one or more CCs suitable for allocation to a second cell, and is not necessarily limited to “set”, and at least one or more of high priority. It is used in the same concept as the “preferred component carrier (CC)" which is a component carrier.
  • the priority according to the first scheme is CC3 ⁇ CC2 ⁇ CC1.
  • the priority according to the second scheme is CC3 ⁇ CC1 ⁇ CC2
  • the priority according to the third scheme is CC4, CC5 ⁇ CC1, CC2, CC3.
  • Table 1 Coverage (Type 1) Load factor (2nd type) CC support (3rd type) CC # 1 versus Load medium Support CC CC # 2 medium Large load Support CC CC # 3 small Small load Support CC CC # 4 - - Unsupported CC CC # 5 - - Unsupported CC
  • the priority of the CC to be allocated to the corresponding femto cell may be CC4, CC5 ⁇ CC3 ⁇ CC1 or CC2, and accordingly, the preferred CC set of the femto cell is CC4, CC5. May be determined as CC3.
  • the corresponding CC may be set as the CC of the femtocell again in a specific order in the determined preferred CC set.
  • FIG. 9 illustrates that the preferred CC set determination apparatus determines the final preferred CC (set) after directly prioritizing CCs by receiving coverage information, load ratio information, supported CC availability information, etc. of the first cell.
  • the preferred CC set determining apparatus may determine the preferred CC set immediately after receiving the priority information for each CC of each first cell from the first cell or another network element.
  • the preferred CC set determination method as shown in FIG. 9 may be applied between an eNB that manages an attack cell and a victim cell.
  • An eNB that controls an attack cell is called an attack base station (aggressor BS), and an eNB that controls a victim cell is called a victim BS (victim BS).
  • the attack base station and the victim base station are relatively determined between eNBs in interference coordination.
  • the component carrier allocation priority may be increased.
  • the victim eNB will be a macro eNB and the attack eNB will be a femto eNB.
  • the preferred CC set may be used to prevent the system frequency bands of the first station and the second station from overlapping.
  • a first preferred CC set including CC1 and CC2 may be determined for the first station
  • a preferred CC set including CC3 and CC4 may be determined for the second station.
  • the subject that determines the preferred CC set may be a first or second station, and according to the third embodiment, the subject that determines the preferred CC set may be a terminal.
  • the terminal may transmit the information on the preferred CC set to the eNB as statistical information (statistics) between devices of the heterogeneous communication system.
  • FIG. 10 illustrates a flow of determining a preferred CC set of a femto cell after receiving usage information for each CC from two or more macro cells according to the present invention.
  • the preferred CC set (preferred CC set) i for the CC of the first macro cell is determined and stored (S1030).
  • N means the number of all macro cells adjacent to the femto cell.
  • the CCs are assigned to the femtocells first, and the priority is given to the CC with the lowest coverage or load rate among all other macrocells.
  • the preferred CC set may be determined in the same manner as to assign.
  • the subject that transmits the usage information for each CC is a terminal
  • the subject that receives the usage information for each CC and determines a preferred CC set is each device that communicates with the terminal. Can be heard.
  • the CC set apparatus is a device that communicates with a terminal or a component of a device.
  • the apparatus for determining a preferred component carrier set 1100 is an apparatus for determining a set of preferred component carriers to be used by a second network node included in coverage of a first network node, and the component carrier from one or more first network nodes.
  • Receiving per-use information requesting at least one CC configuration corresponding to the set of preferred CCs, requesting resource allocation for at least one CC to be used, and requesting a change of the preferred CC
  • the transceiver 1110 further performs a function of transmitting a set of preferred component carriers determined by the preferred CC determiner 1120 to the terminal.
  • the preferred component carrier set determining apparatus 1100 may further include a storage unit 1130 that stores priority information of component carriers for each first network node.
  • the apparatus for determining a preferred component carrier set 1100 may be included in a femto eNB, which is a second network node, but is not limited thereto.
  • MME / SAE gateway, which is a macro cell or eNB, or other core network element, which is a first network node. It may also be implemented inside of other servers.
  • the apparatus for determining a preferred component carrier set 1100 is an eNB of an LTE system from a first network node to a first station, and determines a preferred component carrier set to be used by a second station included in the coverage of the first station. It may include a device.
  • the second station may be a device supporting a Bluetooth or 802.11 (WLAN) system.
  • the apparatus for determining a preferred component carrier set 1100 may include a transceiver 1110 which receives usage information for each component carrier from a first station, and a preferred component carrier to be used by the second station node based on the received usage information for each component carrier. And a preferred CC determiner 1120 that determines and sets the set. In some cases, it may further include a storage unit 1130 for storing the priority information of the component carrier for each first station.
  • the first network node is described as including the first station
  • the second network node is described as including the term including the second station.
  • the preferred CC determiner 1120 selects a preferred component carrier in order of component carriers having short coverage from among a plurality of component carriers set in the first network node, and a first method.
  • a preferred CC set to be allocated to the second network node may be determined according to at least one of the third schemes selected as the preferred CC.
  • the " use information for each CC” includes " detailed use information for each CC " such as service coverage information for each CC, load rate information, support / non-supported CC information, and the above-described first method to the macro cell. It is a concept including "CC-specific priority information” meaning the priority for each CC determined by one or more of the third scheme.
  • the preferred CC determiner 1120 receives the "CC detailed usage information" from the first network node when the usage information for each CC is "detailed usage information for each CC", and then directly determine the priority for each CC and finally Determine the preferred CC set. Meanwhile, when the usage information for each CC is "CC priority information”, after receiving "CC priority information" from the first network node, only the function of determining a final preferred CC set therefrom may be performed.
  • the transceiver 1110 in the preferred CC set determination device 1100 further performs the function of transmitting the determined preferred CC set information to the receiving device. That is, the preferred CC set determining apparatus 1100 selects a signaling method for transmitting the preferred CC set information or the priority information for each CC, which is determined or received from the outside, and then the preferred CC set information or the priority for each CC by the selected signaling method. The ranking information may be transmitted to the terminal.
  • the priority information for each CC is used to remove or adjust the interference caused by collision of CCs when the cell of the second station is included in the cell coverage of the first station in the multi-component carrier system.
  • Information is referred to as information for interference coordination (ICI) or simply interference coordination information. In the following description, for the sake of consistency of description, the interference coordination information will be uniformly used.
  • ICI interference coordination
  • the signaling method according to the present embodiment may be one of dedicated signaling or RRC signaling, but is not limited thereto.
  • the receiver includes a user terminal (UE) connected to a second station included in the coverage of one or more first stations.
  • the transmitter may include a macro eNB, a pico eNB, a hot spot, or a femto eNB as a fixed network node capable of communicating with the UE.
  • the UE receives priority information for each CC transmitted from the first eNB (S1210).
  • the first eNB may directly receive priority information for each CC from the second eNB or calculate priority information for each CC based on detailed usage information for each CC received from the second eNB.
  • the first eNB may broadcast corresponding CC-specific priority information to UE (s) linked to (linked to) the first eNB.
  • the broadcast priority information for each CC is information used to adjust interference in the frequency domain of the UE and may be referred to as information for interference adjustment.
  • all UE (s) forming a link with the first eNB may acquire 'priority information for each CC' and may periodically update existing information.
  • the method of using the priority information for each CC by the receiving apparatus is largely divided into two.
  • the receiving device that receives priority information for each CC from the first eNB uses the priority information for each CC received at the time of initial resource allocation for establishing a link with the first eNB.
  • Configure CC and request resource allocation (S1220).
  • Receiving apparatus re-executes the overall CC configuration due to a sudden decrease in channel performance between the first eNB and the user who formed the link, or resource-specific for each CC, such as when the rank change of priority information for each CC is large
  • Check whether the allocation is necessary S1230
  • the resource reassignment by CC may be requested by the first eNB to request the resource reassignment by CC (S1240).
  • the user terminal or the receiving apparatus can respond more quickly from inter-cell interference, and can relatively reconsider frequency efficiency by preferentially using a CC having a low inter-cell interference.
  • Resource allocation function using a combination of priority information for each CC and received signal power measurement information of the user.
  • the receiving apparatus or the user terminal receives priority information for each CC transmitted from the first eNB (S1310).
  • the priority information for each CC takes into account the average intercell interference in a cell, the inter-cell interference environment for each CC may not coincide with the received priority information. Therefore, the receiving apparatus may apply a process of measuring received signal power of each CC and comparing them for each CC.
  • the reception apparatus determines whether to use priority information for each CC received from the first eNB when measuring the reception signal power for each CC (S1320), and measures the reception signal power for each CC (S1330).
  • it is determined whether to use the priority information for each CC received from the first eNB by the receiver in step S1320, according to a general power measurement method when measuring RSRP (Reference Signal Received Power) It may be performed by determining whether to measure the received signal power for each CC or whether to perform the received signal measurement in consideration of priority information for each CC (information received from the first eNB) according to the present embodiment.
  • RSRP Reference Signal Received Power
  • the measurement period of the intra-frequency RSRP is set to 200 ms.
  • the terminal reports the average value of the RSRP measured during the 200 ms period to the eNB, and performs the same process in CC units in the LTE-A system. Therefore, the received signal power measurement discussed in the present embodiment is not an operation that is additionally performed for the presented invention, but is one of operations performed by the terminal in the existing system operation process.
  • the receiver determines whether the measured reception signal power for each CC conflicts with priority information for each CC (S1340).
  • the receiving apparatus changes the priority for each CC according to the measured reception signal power for each CC (S1350).
  • the magnitude of the received signal power measured by the user may be greater than a reference value.
  • the present invention is not limited thereto, and includes all cases where a predetermined adjustment is required for the priority of each CC set by the femto eNB.
  • the process of changing the priority of each CC according to the measured reception signal power of each CC is resource allocation to the next-order CC when the magnitude of the received signal power measured by the user is larger than the reference even if the priority of each CC is higher than the above. May include, but is not limited to, requesting priority.
  • the receiving apparatus After the receiving apparatus changes the priority for each CC according to the measured reception signal power for each CC, the receiving apparatus updates priority information for each CC (S1360) and reconfigures the CC according to the updated priority information for each CC.
  • a request for a request, a change in a preferred CC, or a resource allocation for each CC is requested (S1370).
  • the embodiment shown in FIG. 13 makes it possible to supplement a coverage hole of a technique of forming a link or resource allocation using only priority user information for each CC.
  • cell coverage of a first eNB is included in cell coverage of a second eNB, and as an example, the first eNB is a femto eNB and the second eNB is a macro eNB.
  • the first eNB may be a communication device supporting a Bluetooth or 802.11 (WLAN) system
  • the second eNB may be an eNB connected to an LTE system.
  • the receiving device is a station or a component of a station, such as a terminal, which is a mobile network node in a homogeneous network system.
  • the receiving device of FIG. 14 is a device or components of devices connected to a terminal in a heterogeneous network system.
  • the receiving apparatus 1400 basically includes a priority information receiving unit 1410 for each CC, a CC configuration unit 1420, and a resource allocating unit 1430, depending on the received signal power for each CC.
  • the received signal power measurement unit 1440 and the priority change unit 1450 for each CC may be included.
  • the priority information receiver 1410 for each CC performs a function of receiving “CC priority information”, which means priority for each CC.
  • Priority for each CC is determined by one or more of the above-described first to third schemes by the preferred component carrier set determining apparatus 1100.
  • the preferred component carrier set determining apparatus 1100 may be included in a femto eNB or a home eNB (HeNB), which is a first eNB, or a macro eNB, which is a second eNB, or another core network element, such as an MME / SAE, a gateway, or another server. Is implemented.
  • the first eNB may be an eNB connected to an LTE system
  • the second eNB may be a communication device supporting a Bluetooth or 802.11 (WLAN) system.
  • the CC configuration unit 1420 and the resource allocation unit 1430 basically configure the CC using the received priority information for each CC and request a resource allocation, but due to a sudden decrease in channel performance, the overall CC configuration ( reconfigure, request change of preferred CC when the priority change of priority information by CC is large, or request resource reassignment by CC to femto eNB if resource reassignment is needed. Can be performed additionally.
  • CC component 1420 and the resource allocator 1430 have been described separately, but may be implemented in a form that is integrated into software or hardware as one block or added to another component as necessary. There will be.
  • the CC set determination unit for determining the preferred CC set based on the priority information for each CC received from the femto cell may be further provided.
  • the priority information receiving unit 1410 for each CC or the CC set determining unit periodically receives information according to a predetermined period, and then checks whether there is a change in the existing preferred CC set, and then changes the priority information for each CC. If the preferred CC set needs to be updated, the update process can be performed.
  • the received signal power measuring unit 1440 measures the received signal power for each CC and transmits the received signal power to the priority change unit 1450 for each CC.
  • the CC priority changing unit 1450 determines whether the measured CC received signal power conflicts with CC priority information, and if the measured CC received signal power conflicts with CC priority information, the measured information is measured. This function changes the priority of each CC according to the received signal power of each CC.
  • the magnitude of the received signal power measured by the user may be increased even if the priority of each CC is a second order. If it is larger than the standard, there is a case of preferentially requesting resource allocation to a next-order CC, but the present invention is not limited thereto, and includes all cases in which a predetermined adjustment is required for the priority for each CC determined by the femto eNB.
  • a preferred CC set which is a CC that a femtocell eNB can form a link with the UE in consideration of inter-cell interference of neighboring macro cells. Accordingly, inter-cell interference can be efficiently reduced by using component carriers.
  • the femto eNB can be provided with an environment that can form a more stable link with the terminal, there is an effect that it can efficiently operate a plurality of component carriers.
  • a component carrier configuration between a femtocell eNB and a UE in a communication environment in which various cells based on Orthogonal Frequency Division Multiplexing (OFDM) using a plurality of component carriers (CC) are mixed In the present invention, a femtocell eNB proposes a component carrier configuration method that can minimize interference from neighboring macro cells using a preferred CC for each component carrier, thereby reducing interference between neighboring cells of heterogeneous networks and improving transmission efficiency. The effect is that you can.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

La présente invention concerne un appareil et un procédé destinés à configurer une porteuse de composants préférée (CC) à utiliser par une première station et une seconde station dans un système de communication sans fil employant une pluralité de porteuses de composants (CCs). Selon la présente invention, il est possible d'abaisser l'interférence inter-cellule (ICI) avec des cellules adjacentes entre la première station et la seconde station, et d'améliorer l'efficacité de la transmission. En outre, l'invention peut exploiter efficacement la pluralité de porteuses de composants.
PCT/KR2010/008841 2010-01-13 2010-12-10 Appareil et procédé destinés à configurer une porteuse de composants dans un système de communication sans fil WO2011087212A2 (fr)

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KR10-2010-0003064 2010-01-13
KR20100003064 2010-01-13
KR10-2010-0053057 2010-06-04
KR1020100053057A KR20110083455A (ko) 2010-01-13 2010-06-04 무선 통신 시스템에서의 선호 요소 반송파 결정 방법 및 장치와, 그를 이용하는 요소 반송파 구성방법 및 수신장치

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WO2013147505A1 (fr) * 2012-03-27 2013-10-03 Samsung Electronics Co., Ltd. Procédé et appareil permettant de transmettre des informations de faisceau dans un système de communication sans fil

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