WO2012099369A2 - Appareil et procédé destinés à la transmission d'informations d'état de canal dans un système de communication sans fil - Google Patents

Appareil et procédé destinés à la transmission d'informations d'état de canal dans un système de communication sans fil Download PDF

Info

Publication number
WO2012099369A2
WO2012099369A2 PCT/KR2012/000379 KR2012000379W WO2012099369A2 WO 2012099369 A2 WO2012099369 A2 WO 2012099369A2 KR 2012000379 W KR2012000379 W KR 2012000379W WO 2012099369 A2 WO2012099369 A2 WO 2012099369A2
Authority
WO
WIPO (PCT)
Prior art keywords
channel state
state information
base station
subset
information
Prior art date
Application number
PCT/KR2012/000379
Other languages
English (en)
Korean (ko)
Other versions
WO2012099369A3 (fr
Inventor
권기범
안재현
김시형
박경민
Original Assignee
주식회사 팬택
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.)
Filing date
Publication date
Priority claimed from KR1020110013217A external-priority patent/KR20120083192A/ko
Application filed by 주식회사 팬택 filed Critical 주식회사 팬택
Priority to US13/979,071 priority Critical patent/US20130294351A1/en
Publication of WO2012099369A2 publication Critical patent/WO2012099369A2/fr
Publication of WO2012099369A3 publication Critical patent/WO2012099369A3/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present invention relates to wireless communication, and more particularly, to an apparatus and method for transmitting channel state information in a wireless communication system.
  • 3GPP LTE long term evolution
  • UMTS Universal Mobile Telecommunications System
  • 3GPP LTE uses orthogonal frequency division multiple access (OFDMA) in downlink and single carrier-frequency division multiple access (SC-FDMA) in uplink.
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier-frequency division multiple access
  • MIMO multiple input multiple output
  • LTE-A 3GPP LTE-Advanced
  • heterogeneous network As wireless communication technology develops, a heterogeneous network (hereinafter referred to as a heterogeneous network) environment is emerging.
  • Heterogeneous network environments include a macro cell, a femto cell, a pico cell, and the like.
  • the femto cell and pico cell are systems that cover an area smaller than the radius of the existing mobile communication service as compared to the macro cell.
  • a user terminal present in any one of a macrocell, a femtocell, and a picocell experiences inter-cell interference in which signal interference is caused by a signal generated from another cell.
  • An object of the present invention is to provide an apparatus and method for transmitting channel state information in a wireless communication system.
  • Another object of the present invention is to provide an apparatus and method for transmitting channel state information for each subset.
  • Another technical problem of the present invention is to provide a method for transmitting information on a binding relationship between a cell set and a subset to a terminal.
  • Another technical problem of the present invention is to provide an apparatus and method for aperiodically transmitting channel state information based on a binding relationship between a cell set and a subset.
  • Another technical problem of the present invention is to provide an apparatus and method for periodically transmitting channel state information.
  • Another technical problem of the present invention is to provide an apparatus and method for periodically transmitting channel state information for a plurality of merged subsets.
  • a method for transmitting channel state information by a terminal in a wireless communication system includes receiving information from a base station indicating linkage between a cell set including a serving cell and a subset including a subframe, a channel for the subframe on the serving cell. Constructing state information, receiving channel state information request information indicating the cell set from the base station, and transmitting the channel state information to the base station.
  • a terminal for transmitting channel state information in a wireless communication system includes a downlink receiver for receiving information indicating a binding relationship between a cell set including a serving cell and a subset including a subframe and channel state information request information indicating the cell set from the base station; And a channel state information constructing unit for measuring a channel state for the subframe, constituting channel state information indicating the measured channel state, and an uplink transmitter for transmitting the channel state information to the base station.
  • a method of receiving channel state information by a base station in a wireless communication system includes transmitting information indicating a binding relationship between a cell set including a serving cell and a subset including a subframe to the terminal, transmitting channel state information request information indicating the cell set to the terminal; And receiving the channel state information from the terminal.
  • a base station for receiving channel state information in a wireless communication system.
  • the base station includes a downlink transmitter for transmitting information indicating a binding relationship between a cell set including a serving cell and a subset including a subframe and channel state information request information indicating the cell set to a terminal, and the physical downlink.
  • a channel state information request information generation unit for generating the channel state information request information to be transmitted on a physical downlink control channel (PDCCH), and an uplink receiving unit for receiving the channel state information from the terminal.
  • PDCCH physical downlink control channel
  • a method in which a terminal periodically transmits channel state information in a wireless communication system may include determining whether there is at least one of a change in a report period of channel state information, a change of a subset, and a change of an ABS pattern. If there is a change of the subset, the channel state of the changed subset is present. And measuring, and if there is a change in the reporting period of the channel state information, transmitting channel state information indicating the measured channel state to the base station based on the changed report period of the channel state information. .
  • the subset includes at least one subframe to which the channel state information is to be reported.
  • the channel state information that changes with time is measured accurately and the channel state at the point of time desired by the scheduler Since information can be obtained, there is an effect of improving the scheduling gain for resource allocation of the serving cell.
  • FIG. 1 is a diagram schematically illustrating a concept of a heterogeneous network including a macro cell, a femto cell, and a pico cell.
  • FIG. 2 is a diagram schematically illustrating that a user terminal is affected by interference between a macro cell, a femto cell, and a pico cell in downlink.
  • FIG. 3 is a diagram illustrating a frame pattern for inter-cell interference coordination in a heterogeneous network system.
  • PCell primary serving cell
  • SCell secondary serving cell
  • FIG. 5 is a flowchart illustrating a method of transmitting channel state information according to an embodiment of the present invention.
  • FIG. 6 is a block diagram illustrating a terminal for transmitting channel state information and a base station for receiving according to an embodiment of the present invention.
  • FIG. 7 is a conceptual diagram illustrating a method of periodically transmitting channel state information for two subsets according to an embodiment of the present invention.
  • FIG. 8 is a flowchart illustrating a method of transmitting channel state information according to another embodiment of the present invention.
  • FIG. 9 is a flowchart illustrating a periodic transmission method of channel state information by a terminal according to an embodiment of the present invention.
  • FIG. 10 is a flowchart illustrating a process of selecting a periodic transmission method of channel state information by a base station according to an embodiment of the present invention.
  • the present specification describes a wireless communication network
  • the operation performed in the wireless communication network is performed in the process of controlling the network and transmitting data in the system (for example, the base station) that is in charge of the wireless communication network, or the corresponding wireless Work may be done at the terminal coupled to the network.
  • pico cells can generally be used in communication shadow areas that are not covered by macro cells alone, or in areas with high data service requirements, so-called hot zones.
  • Femtocells can generally be used in indoor offices or at home.
  • the wireless relay can supplement the coverage of the macro cell.
  • FIG. 1 is a diagram schematically illustrating a concept of a heterogeneous network including a macro cell, a femto cell, and a pico cell.
  • a macro base station 110, a femto base station 120, and a pico base station 130 are operated together in a heterogeneous network.
  • the macro base station 110, the femto base station 120, and the pico base station 130 each have their own cell coverages 111, 121, and 131.
  • a cell provided by the macro base station 110 is referred to as a macro cell 111, a cell provided by the femto base station 120, a femto cell 121, and a cell provided by the pico base station 130 is called a pico cell 131.
  • the femto base station 120 is a low power wireless access point, for example, a micro mobile base station used indoors, such as at home or office.
  • the femto base station 120 may access a mobile communication core network using DSL or cable broadband in a home or office.
  • the femto base station 120 is connected to a mobile communication network through a wired network such as the Internet network.
  • a terminal in the femto cell 121 may access a mobile communication network or an internet network through the femto base station 120.
  • the femto base station 120 supports a self-organization function.
  • Self-organization functions are classified into a self-configuration function, a self-optimization function, and a self-monitoring function.
  • Self-configuration is a feature that allows a wireless base station to be installed on its own based on an initial installation profile without going through a cell planning step.
  • Self-Optimization is a function that identifies neighboring base stations, obtains information, optimizes the neighboring base station list, and optimizes coverage and communication capacity according to subscriber and traffic changes.
  • Self-Monitoring is a function to control service performance not to be degraded through collected information.
  • the femto base station 120 may distinguish a registered user from an unregistered user and allow access only to the registered user.
  • Cells that allow access only to registered users are called Closed Subscriber Groups (“CSGs”), and access to general users is also called Open Subscriber Groups (“OSGs”). Is called). It is also possible to mix these two methods.
  • the femto base station 120 may be called a Home NodeB (HNB) or a Home eNodeB (HeNB).
  • HNB Home NodeB
  • HeNB Home eNodeB
  • the HNB and the HeNB are collectively referred to as the femto base station 120.
  • the femto base station 120 basically aims to provide specialized services only to members belonging to the CSG. However, depending on the operation mode setting of the femto base station 120 may also provide services to other users in addition to the CSG.
  • FIG. 1 illustrates a heterogeneous network composed of a macro cell, a femto cell, and a pico cell for convenience of description
  • the heterogeneous network may include a relay or another type of cell.
  • FIG. 2 is a diagram schematically illustrating that a user terminal is affected by interference between a macro cell, a femto cell, and a pico cell in downlink.
  • the terminal 200 and the femto base station 210 are located at a cell edge of a macro cell provided by the macro base station 220. If the femto base station 210 is in the CSG mode and the terminal 200 is not registered with the CSG with respect to the femto base station 210, the terminal 200 cannot connect to the femto base station 210 with strong signal strength and the femto base station ( Compared to the signal strength of 210, it is inevitably connected to the macro base station 220, which is relatively weak in signal strength. Therefore, in this case, the terminal 200 may receive an interference signal from the femto base station 210.
  • the terminal 200 may use a pico cell provided by the pico base station 230. However, the terminal 200 may be affected by the interference by the macro cell 220.
  • a macro cell to be more affected by the interference or to be more protected from the interference is a macro cell.
  • an aggressor cell that affects or is less affected by the Victim cell by the interference is a femto cell. This is more affected by the interference of the weak signal of the macro base station 220 than the strong signal output from the femto base station 210 in the vicinity, the user of the macro base station 220 than the user of the femto base station 210 Because there is much more. In other words, it is very likely that there are terminals that cannot move to the femto cell among the terminals in the macro cell entering the region where the signal of the femto base station 210 is strongly received.
  • Inter-Cell Interfernce Coordination or enhanced inter-cell interference coordination (eICIC) is a method of reducing inter-cell interference.
  • inter-cell interference coordination is a method for supporting reliable communication to a user when a user belonging to a big team cell is near an aggregator cell.
  • constraints may be imposed on the scheduler, for example, for the use of certain time and / or frequency resources.
  • constraints on how much power to use for a particular time and / or frequency resource may be imposed on the scheduler.
  • FIG. 3 is a diagram illustrating a frame pattern for inter-cell interference coordination in a heterogeneous network system.
  • a new frame pattern may be configured to adjust interference between heterogeneous cells (macro cell and femto cell or macro cell and pico cell).
  • the macro cell hardly transmits a signal, so the transmission power is very low. Therefore, in this case, since there is almost no signal transmitted in the subframe, such a subframe is called ABS (almost blank subframe: ABS).
  • ABS is used by the femto cell and used to rule out interference with the macro cell.
  • ABS is formed in a specific pattern in the radio frame for coordination of interference, which is called a frame pattern.
  • the frame pattern may be called an ABS pattern.
  • the interference is adjusted by variably configuring the ABS in any periodic section composed of a plurality of subframes.
  • TDM time division multiplexing
  • IRC inter-cell interference coordination
  • the present invention is limited to heterogeneous cells using time resources in subframe units, but this is only an example. That is, the technical idea of the present invention includes all embodiments in which heterogeneous cells divide time resources in slot units, frame units, or other definable units of time.
  • the TDM inter-cell interference coordination according to the present invention is described by specifying only the interference between the macro cell and the femto cell, but this is only an example, and it can be applied to the interference between the macro cell and the pico cell and the interference between the pico cell and the femto cell. .
  • the macro base station and the femto base station may perform communication based on the ABS pattern.
  • the first subframe may be dedicated to the macro base station
  • the second subframe may be dedicated to the femto base station.
  • the macro base station may use the second subframe only for terminals in the macro base station at a position where the signal of the femto base station cannot receive the second subframe used by the femto base station.
  • the femto base station may not perform the scheduling of the first subframe at all because it is used exclusively by the macro base station in the first subframe.
  • the base station needs to know the state of the downlink channel for scheduling.
  • the femto base station Since the femto base station has low interest in scheduling the first subframe, it is not necessary to receive the state of the downlink channel for the first subframe.
  • the macro base station and the femto base station need only know the state of the downlink channel for the subframe of interest.
  • performing the channel measurement on the subframe in which the base station to which the serving cell belongs does not transmit information to the terminal generates unnecessary power consumption, thereby shortening the life of the battery. This is to measure the channel only in the frame.
  • the macro base station or the femto base station may want to receive only channel state information (CSI) for a specific subframe corresponding to the operation of the ABS pattern from the terminal.
  • the specific subframe may be any subframe.
  • the specific subframe may be a subframe that is ABS or a subframe that is non-ABS. non-ABS is a concept in contrast to ABS.
  • the terminal may measure only the channel state for the subframe determined by the macro base station or the femto base station and feed back channel state information accordingly.
  • the set of subframes which are predetermined as the position (or target) where the UE measures the channel state, are called a subset.
  • the subset may be undefined at all or may be set to two.
  • the first subset may be ⁇ 0, 2, 4 ⁇ and the second subset may be ⁇ 1, 3, 5 ⁇ .
  • a is the index of the subframe.
  • the subset may be indicated by a bitmap.
  • a subframe included in a subset among the entire subframes 1, 2, 3, 4, and 5 is ⁇ 2, 4, 5 ⁇ .
  • the bitmap represents 01011. If the bit is 1, the corresponding subframe is included in the subset. If the bit is 0, the corresponding subframe is not included in the subset.
  • the subset configuration information is information related to the setting of the subset.
  • the subset configuration information may be transmitted to the terminal by Radio Resource Control (RRC) signaling of the base station.
  • RRC Radio Resource Control
  • the base station informs the terminal as subset configuration information that the first subset is set to ⁇ 0, 2, 4 ⁇ and the second subset is set to ⁇ 1, 3, 5 ⁇ .
  • the base station needs to indicate to the terminal a subset that requires channel state information from among a plurality of subsets. For example, the base station may request channel state information for the first subset or request channel state information for the second subset.
  • the terminal feeds back channel state information on the subset indicated by the base station. For example, when the base station indicates a second subset of ⁇ 1, 3, 5 ⁇ , the terminal may provide channel state information for subframe 1, channel state information for subframe 3, and channel state information for subframe 5; Feedback to the base station.
  • a subset indicator which is separate information indicating a subset, may be newly defined in downlink control information (or uplink grant) of format 0 or 4.
  • the subset indicator may be 1 bit, and if it is '0', it may indicate the first subset, and if it is '1', it may indicate the second subset.
  • adding the subset indicator separately may modify the format of the existing downlink control information, which may cause an additional blind decoding burden of the terminal.
  • channel state information a cell set will be described first, and a method of indicating a subset will be described in detail.
  • the channel state information refers to information representing a channel state of a transmission link (eg, downlink), and the channel state may be obtained by the UE measuring a CSI reference signal.
  • the channel state information may include, for example, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and the like.
  • CQI channel quality indicator
  • PMI precoding matrix indicator
  • RI rank indicator
  • the information may mean information derived by CQI / PMI / RI.
  • the CQI indicates the modulation and coding scheme (MCS) level suitable for the measured channel condition. For example, it is shown in Table 1 below.
  • Table 1 CQI index Modulation 0 out of range One QPSK 2 QPSK 3 QPSK 4 QPSK 5 QPSK 6 QPSK 7 16QAM 8 16QAM 9 16QAM 10 64QAN 11 64QAN 12 64QAN 13 64QAN 14 64QAN 15 64QAN
  • PMI provides information about a precoding matrix in a codebook based precoding.
  • PMI is associated with multiple input multiple output (MIMO). Feedback of the PMI from the MIMO is called closed loop MIMO.
  • RI is information on the number or rank of layers recommended by the terminal.
  • the rank may be defined as the number of non-zero eigenvalues of the MIMO channel matrix and the number of spatial streams that can be multiplexed.
  • the RI is always associated with one or more CQI feedback.
  • the fed back CQI is calculated assuming a specific RI value. Since the rank of the channel generally changes slower than the CQI, the RI can be fed back less than the CQI.
  • the transmission period of the RI may be a multiple of the CQI / PMI transmission period.
  • the channel state information may be transmitted through a Physical Uplink Control CHannel (PUCCH) or may be transmitted through a Physical Uplink Shared CHannel (PUSCH).
  • PUCCH Physical Uplink Control CHannel
  • PUSCH Physical Uplink Shared CHannel
  • the aperiodic transmission method is performed by requesting the terminal when the base station needs precise channel state information. This request is performed by the base station transmitting channel state request information to the terminal.
  • the channel state information request information may be included in downlink control information (DCI) of format 0 or format 4.
  • DCI downlink control information
  • Downlink control information of format 0 or format 4 may be referred to as an uplink grant.
  • Channel status information request information is defined as 1 bit or 2 bits.
  • 1-bit channel state information request information is used when the base station configures only one serving cell to the terminal, and 2-bit channel state information request information is used when the base station configures two or more serving cells to the terminal. In other words, after the first one serving cell is configured, 1-bit channel state information request information is used. Thereafter, the base station may additionally configure one or more serving cells to the terminal, and after the additional serving cells are configured, the 2-bit channel state information request information is used.
  • channel state information request information supporting a terminal in which at least one serving cell (or a plurality of component carriers) is configured may be defined.
  • the following table shows the content indicated by the 2-bit channel status information request information (CSI request information).
  • the channel state information when the value of the channel state information request information is 01, aperiodic channel state information reporting to the serving cell is triggered.
  • the channel state information relates to an uplink component carrier to which the channel state information is to be transmitted and a downlink component carrier configured based on uplink frequency information defined in a system information block (SIB) 2.
  • SIB system information block
  • the values of the channel state information request information are 10 and 11, this means triggering channel state information reporting for the serving cells of the first cell set and the second cell set, respectively.
  • the UE may determine channel state information for the first cell set, that is, channel state information for the serving cell 1, channel state information for the serving cell 2, and channel state for the serving cell 3; The information is transmitted to the macro base station or pico base station or femto base station.
  • CSI channel state information
  • RRM radio resource management
  • RLM radio link monitoring
  • the situation in which the main serving cell cannot be changed to another frequency band or base station is a situation where link performance of another frequency band or inter-base station is worse.
  • the base station may configure subsets of subframes separated from each other in order to obtain channel state information differently between subframes by applying an inter-cell interference coordination technique.
  • the UE may request measurement of channel state information in the corresponding subframe of the subset including the subframes. Accordingly, the terminal measures and reports channel state information in a subframe of the corresponding subset according to the channel state information request information (request value) requested from the base station, that is, by applying an inter-cell interference coordination technique according to the request of the base station. Inter-cell interference for the serving cell can be mitigated.
  • Channel Status Reference 0 Aperiodic channel status information of main serving cell measured based on first subset of channel status information
  • Channel State Reference 1 Aperiodic channel state information of the main serving cell measured based on the second channel state information subset
  • Channel State Reference 2 Aperiodic channel state information of the first secondary serving cell measured based on all subframes
  • Channel State Reference 3 Aperiodic channel state information of the second secondary serving cell measured based on all subframes
  • Channel Status Reference N Aperiodic channel status information of N-2nd secondary serving cell measured based on all subframes
  • the base station configures the first cell set as ⁇ channel state reference 0, channel state reference 2, channel state reference 3 ⁇ and sets the terminal to the cell interference coordination mode.
  • the terminal measures the channel state reference 0 of the primary serving cell based on the first channel state information subset and stores the channel state information measured based on the subset.
  • the terminal when the terminal receives the value '10' of the channel state information request information, the terminal receives the channel state information of the primary serving cell measured based on the first channel state information subset and the first and second secondary serving cells based on all subframes.
  • the channel state information is transmitted to the base station.
  • the base station configures the second cell set as ⁇ channel state reference 1, channel state reference 2, channel state reference 3 ⁇ and sets the terminal to the cell interference coordination mode.
  • the terminal when the terminal receives the value '11' of the channel state information request information from the base station, the terminal is the channel state information of the primary serving cell measured based on the second channel state information subset, and based on the first and second subframes The channel state information of the secondary serving cell is measured and transmitted to the base station.
  • the terminal does not apply the subset. That is, since the inter-cell interference adjustment mode is not set, there is no need to measure based on the channel state information subset.
  • the terminal does not perform the measurement operation based on the channel state information subset defined in the channel state reference 0 and the channel state reference 1.
  • the terminal measures the aperiodic channel state information of the main serving cell based on all subframes and transmits it to the base station.
  • the cell set configuration information may be transmitted by RRC signaling or Medium Access Control (MAC) signaling or physical layer signaling.
  • MAC Medium Access Control
  • the concept of a serving cell may be defined in carrier aggregation (CA).
  • CA carrier aggregation
  • Individual unit carriers bound by carrier aggregation are called component carriers (CC).
  • the CC used for downlink transmission is called a downlink CC (DL CC), and the CC used for uplink transmission is called an uplink CC (UL CC).
  • DL CC downlink CC
  • UL CC uplink CC
  • Each CC is defined by a bandwidth and a center frequency.
  • the CC may correspond to a serving cell.
  • the DL CC may configure one serving cell, or the DL CC and the UL CC may be connected to configure one serving cell. However, the serving cell is not configured with only one UL CC.
  • PCell primary serving cell
  • SCell secondary serving cell
  • the serving cell includes a main serving cell 405 and a secondary serving cell 420.
  • the remaining cells 400, 410, 415, 425, 430, 435, and 440 except the serving cell are called neighbor cells.
  • the primary serving cell 405 refers to one serving cell that provides security input and NAS mobility information in an RRC connection or re-establishment state.
  • at least one cell may be configured to form a set of serving cells together with the main serving cell 405.
  • the at least one cell is called a secondary serving cell 420. Therefore, one group may be composed of only one main serving cell 405 or one main serving cell 405 and at least one secondary serving cell 420.
  • the DL CC corresponding to the main serving cell 405 is referred to as DL PCC, and the UL CC corresponding to the main serving cell 405 is called UL PCC.
  • the DL CC corresponding to the secondary serving cell 420 is called a downlink sub-component carrier (DL SCC)
  • DL SCC downlink sub-component carrier
  • UL SCC uplink sub-component carrier
  • the main serving cell 405 and the secondary serving cell 420 have the following characteristics.
  • the main serving cell 405 is used for transmission of the PUCCH.
  • the main serving cell 405 is always activated, while the secondary serving cell 420 is a carrier that is activated / deactivated according to a specific condition.
  • the main serving cell 405 may be changed by a security key change or a handover procedure accompanying a RACH (Random Access CHannel) procedure.
  • RACH Random Access CHannel
  • MSG4 contention resolution
  • only the PDCCH indicating the MSG4 should be transmitted through the main serving cell 405, and the MSG4 information may be transmitted through the main serving cell 405 or the secondary serving cell 420.
  • NAS non-access stratum
  • the main serving cell 405 is always configured with a pair of DL PCC and UL PCC.
  • a different CC may be set as the main serving cell 405 for each terminal.
  • procedures such as reconfiguration, adding, and removal of the secondary serving cell 420 may be performed by the RRC layer.
  • RRC signaling may be used to transmit system information of the dedicated secondary serving cell.
  • main serving cell 405 and the secondary serving cell 420 are not necessarily limited to the above description, which is merely an example and may include more examples.
  • the macro base station or the femto base station may inform the terminal of the information on the binding relationship through the RRC signaling, or may broadcast to the terminal through the system information.
  • the binding relationship may be known in advance by the base station and the terminal. If there is a binding relationship between the reference information and the subset, the macro base station or the femto base station may automatically indicate only the reference information to the terminal to indicate the subset bound thereto. This eliminates the need for additional bits to explicitly indicate the subset.
  • the reference information is downlink information transmitted from the macro base station or the femto base station to the terminal, and may have various embodiments. Since the subset is related to the channel state information, it may be effective to define the information used in the transmission procedure of the channel state information as reference information.
  • the reference information having a binding relationship with the subset may be a cell set.
  • the binding relationship exists between the cell set and the subset.
  • the information about the binding relationship indicating the binding relationship between the cell set and the subset may be defined as shown in the following table.
  • the k-th cell set has a binding relationship with the k-th subset.
  • the k-th subset that depends on the cell set is automatically specified.
  • the cell set and the subset have the same indices. However, this is only an example and the indices may be different.
  • the information about the binding relationship may be included in the RRC configuration message in the RRC establishment procedure or the RRC reconfiguration message in the RRC reconfiguration procedure together with the cell set configuration information.
  • the reference information having a binding relationship with the subset may be channel state information request information. This adds an indication meaning of a subset to the channel state information request information. Accordingly, the code point of the channel state information request information is extended.
  • the channel state information request information may be configured as shown in Table 5.
  • the terminal feeds back channel state information corresponding to the second subset from the serving cell of the second cell set. do.
  • the channel state information request information may be configured as shown in Table 6.
  • the channel state information request information having a value of '11' is the same as that of '10', but the serving cell configuration is the same as the first cell set, but the terminal feeds back channel state information corresponding to the second subset.
  • the subset may include all kinds of serving cells (or DL CCs) for aperiodic transmission of channel state information.
  • the subset may include a primary serving cell and / or a secondary serving cell.
  • the serving cell indicating the CQI measurement subset is limited to the primary serving cell, the subset may include only the primary serving cell.
  • the cell sets indicated by '10' and '11' all include only the main serving cell, and the subsets are different.
  • the channel state information request information 10 or 11 requests channel state information for the first subset or the second subset for the primary serving cell.
  • the CSI request field may be configured in a manner of defining to transmit both channel state information of both measurement limit subsets with respect to the CSI request value 01. This may be expressed as shown in Table 7 below.
  • the 1-bit channel state information request information may be configured as follows.
  • Table 8 Value of CSI Request Instruction Subset 0 No request for aperiodic channel status information One Triggering of aperiodic channel state information reporting for serving cell 1, 2
  • the channel state information request information may be configured as shown in Table 9.
  • the channel state information request information having a value of '11' is different from '10' in indicating a configuration of the second cell set, but the terminal feeds back channel state information corresponding to the first subset. Is the same in.
  • the CSI request field may be configured in a manner of defining the CSI request values 10 and 11 in advance without transmitting the information on the channel state information measurement restriction subset through RRC signaling.
  • the CSI request field may be configured in a manner of defining to transmit both channel state information of both measurement limit subsets with respect to the CSI request value 01 based on Table 11.
  • the channel state information measurement limit mode all measurement values for the first and second measurement limit subsets are considered. 10 Only the trigger of channel state information reporting for the serving cell of the first cell set set by the upper layer is considered. In the channel state information measurement limit mode, only the measurement value for the first measurement limit subset is considered. 11 Only the trigger of channel state information reporting for the serving cell of the first cell set set by the upper layer is considered. In the channel state information measurement limit mode, only the measurement value for the second measurement limit subset is considered.
  • the 1-bit channel state information request information may be configured as follows.
  • Table 12 Value of CSI Request Instruction 0 No request for aperiodic channel status information One Trigger only on aperiodic channel state information reporting to the serving cell. In case of the channel state information measurement limit mode, all measurement values for the first and second measurement limit subsets are considered.
  • the base station may be any one of a macro base station, a femto base station, or a pico base station.
  • the base station transmits an RRC connection reconfiguration message including configuration information regarding cell set configuration information, subset configuration information, and channel state information to the terminal (S500).
  • At least one cell set is configured in the terminal by the cell set configuration information
  • at least one subset is configured in the terminal by the subset configuration information.
  • a binding relationship exists between at least one cell set and at least one subset configured in the terminal, and the binding relationship may be implicitly established between the base station and the terminal.
  • information about a separate binding relationship indicating the binding relationship may be included in the RRC connection reconfiguration message and transmitted.
  • the terminal may store information about the binding relationship.
  • Configuration information about the channel state information is information indicating the setting for the transmission of the CQI, PMI, RI.
  • the terminal performs reconfiguration of the RRC connection according to the RRC connection reconfiguration message, and transmits an RRC connection reconfiguration complete message to the base station (S505).
  • the terminal measures the channel state and configures channel state information (S510).
  • the channel state information includes at least one of CQI, PMI, and RI.
  • the UE measures the first channel state for subframes 1, 2 and 3 of the primary serving cell, the second channel state for subframes 1, 2 and 3 of the secondary serving cell 1, or the secondary serving
  • a third channel state of subframes 1, 2, and 3 of cell 2 may be measured.
  • the terminal may measure all of the first to third channel states. The terminal configures first channel state information indicating the first channel state, configures second channel state information indicating the second channel state, and configures third channel state information indicating the third channel state.
  • the base station transmits the channel state information request information to the terminal (S515).
  • the channel state information request information may be transmitted as included in downlink control information of format 0 or format 4 as described above.
  • the channel state information request information is transmitted through a physical downlink control channel (PDCCH).
  • the channel state information request information also includes a subset indication as shown in Tables 5 to 9, for example.
  • the terminal transmits channel state information to the base station (S520).
  • the terminal transmits at least one of the configured first to third channel state information to the base station. If the channel state information request information indicates the first cell set, the terminal transmits the first channel state information for the second subset bound to the first cell set to the base station. Or, if the channel state information request information indicates the second cell set, the terminal transmits the second channel state information and the third channel state information for the second subset bound to the second cell set to the base station.
  • Channel state information is transmitted through the PUSCH.
  • the base station may include a macro base station, a femto base station or a pico base station.
  • the terminal 600 includes a downlink receiver 605, an RRC connection reconfiguration unit 610, a channel state information configuration unit 615, and an uplink transmitter 620.
  • the downlink receiver 605 receives downlink information transmitted by the base station 650 in downlink, and the downlink information includes an RRC message and channel state information request information.
  • the RRC message includes an RRC Connection Reconfiguration message.
  • the RRC connection reconfiguration message includes at least one of cell set configuration information, subset configuration information, configuration information on binding relationship, and channel state information.
  • the channel state information request information is information that the base station requests channel state information from the terminal in aperiodic transmission of the channel state information.
  • the RRC connection reconfiguration unit 610 configures the cell set and the subset according to the instruction of the RRC connection reconfiguration message received by the downlink receiver 605, and sets the binding relationship between the cell set and the subset according to the information on the binding relationship. do.
  • the RRC connection reconfiguration unit 610 configures a parameter related to transmission of channel state information.
  • the UE includes a first channel state for subframes 1, 2 and 3 of the primary serving cell, a second channel state for subframes 1, 2 and 3 of the secondary serving cell 1 and subframes 1, 2, and 2 of the secondary serving cell 2
  • a third channel state for 3 is measured and channel state information for each channel state is configured.
  • the uplink transmitter 620 transmits uplink information to the base station 650.
  • the uplink information includes channel state information and an RRC connection reconfiguration complete message.
  • the uplink transmitter 620 transmits the channel state information configured by the channel state information configuration unit 615 to the base station 650 through the PUSCH. Alternatively, the uplink transmitter 620 transmits an RRC connection reconfiguration complete message to the base station 650 in response to the RRC connection reconfiguration message.
  • the base station 650 includes a downlink transmitter 655, an RRC message generator 660, a channel state information request information generator 665, and an uplink receiver 670.
  • the downlink transmitter 655 transmits the channel state information request information generated by the channel state information request information generator 665 to the terminal 600.
  • the downlink transmitter 655 transmits the RRC message generated by the RRC message generator 660 to the terminal 600.
  • the RRC message includes an RRC Connection Reconfiguration message.
  • the channel state information request information generator 665 generates the channel state information request information.
  • the channel state information request information may be transmitted as included in downlink control information of format 0 or format 4 as described above. In this case, the channel state information request information is transmitted through the PDCCH.
  • the channel state information request information also includes a subset indication as shown in Tables 5 to 9, for example.
  • the uplink receiver 670 receives uplink information transmitted by the terminal 600 in uplink.
  • the uplink information includes channel state information.
  • the terminal transmits the channel state information at a predetermined cycle. That is, even without the channel state information request information in the aperiodic transmission scheme, the UE voluntarily transmits the channel state information at a predetermined cycle.
  • the ABS pattern may be applied even in the periodic transmission method. Therefore, when the subset according to the ABS pattern is determined, the terminal transmits the channel state information for the subset at regular intervals.
  • each subset may include only different subframes.
  • each subset may include at least one common subframe.
  • all subsets may not include at least one subframe.
  • the other subset may include the remaining subframes except the subframes included in one subset.
  • one subset may include subframes that are ABS, and the other subset may include subframes that are non-ABS.
  • reporting periods may be set for each subset, or a common reporting period may be set.
  • the reporting period is different for each subset, for example, when the reporting period P1 is applied to the first subset and the reporting period P2 is applied to the second subset, the terminal may transmit channel state information according to the reporting period corresponding to the selected subset.
  • a common reporting period for example, when the reporting period P3 is applied to both the first subset and the second subset, the terminal transmits channel state information according to the reporting period P3 regardless of which subset is selected.
  • FIG. 7 is a conceptual diagram illustrating a method of periodically transmitting channel state information for two subsets according to an embodiment of the present invention. This is the case when a plurality of independent subsets are linked to the reporting period of one common channel state information. That is, not each subset has a separate reporting period, but the reporting period of channel state information for all subsets is the same.
  • the first subset # 1 is ⁇ 1, 3, 5, 6, ..., 40 ⁇
  • the second subset # 2 is ⁇ 2, 3, 5, ... , 39 ⁇ .
  • the first subset and the second subset may include different subframes or may include subframes common to each other.
  • the subframes commonly included in the first subset and the second subset are 3, 5,... Subframes 1, 6, ..., 40 are included only in the first subset
  • subframes 2, ..., 39 are included only in the second subset.
  • subframe 4 does not belong to both the first subset and the second subset. That is, the UE does not measure the channel state in subframe 4 even if any subset is indicated from the base station.
  • the reporting period of the channel state information is 2 subframes and transmission starts from subframe 2, the transmission of channel state information occurs in subframes 2, 4, 6, 8, ..., 38, 40. .
  • the UE measures the channel state in subframes 1, 3, 5, 6, ..., 40 belonging to the first subset and based on the reporting period, the subframes 2, 4, 6 Channel status information is transmitted at, 8, ..., 38, 40.
  • Channel state information measured in subframe 1 is measured in subframe 2
  • channel state information measured in subframe 3 is measured in subframe 4
  • channel state information measured in subframe 5 is measured in subframe 6, and subframe 6
  • the channel state information is transmitted in subframe 8, respectively.
  • the second subset ⁇ 2, 3, 5, ..., 39 ⁇ also corresponds to the subframes 2, 4, 6, 8, At 38, 40, the transmission of channel state information takes place.
  • channel state information for subframes 3 or 5 may be transmitted even if only one subset is specified. However, if the first subset and the second subset do not cross each other to include a common subframe, only the channel state information for the first subset is transmitted, and the channel state information for the second subset is not transmitted at all. Can be. Alternatively, even if the base station designates the second subset, channel state information for some subframes of the second subset may not be transmitted due to characteristics of the reporting period. As a result, the base station cannot obtain channel state information for some subframes. To solve this problem, the base station may use various methods.
  • the base station may adjust setting parameters of the channel state information to obtain channel state information for each required subset.
  • the base station may transmit the configuration parameter of the channel state information to the terminal in higher layer signaling, for example, RRC signaling.
  • Table 13 shows CQI report configuration information (CQI-ReportConfig) according to an embodiment of the present invention.
  • Table 13 -ASN1STARTCQI-ReportConfig :: SEQUENCE ⁇ cqi-ReportModeAperiodic ENUMERATED ⁇ rm12, rm20, rm22, rm30, rm31, spare3, spare2, spare1 ⁇ OPTIONAL,-Need OR reporting mode.
  • a new reporting mode may be added to the CQI reporting configuration information.
  • the CQI report configuration information includes a CQI-ReportPeriodic field.
  • the reporting period and subframe offset of the CQI or PMI are determined based on cqi-pmi-ConfigIndex (ICQI / PMI) which is a parameter in the CQI-ReportPeriodic field.
  • cqi-pmi-ConfigIndex (ICQI / PMI) may be defined as shown in the following table.
  • N p is a report period of CQI / PMI and N OFFSET, CQI indicates a subframe offset at which CQI / PMI reporting starts.
  • I CQI / PMI is divided into a plurality of I CQI / PMI levels. In Table 14, twelve levels are taken as an example.
  • RI-ConfigIndex (I RI ), which is a parameter for determining the reporting period and subframe offset of the RI , may be defined as shown in the following table.
  • M RI is a report period of RI and N OFFSET
  • the base station when there is a parameter (I CQI / PMI , I RI ) that determines the reporting period and subframe offset in which channel state information such as CQI / PMI / RI is transmitted, the base station changes the parameter to report period and / or sub You can change the frame offset. This allows the base station to obtain channel state information for each required subset.
  • the base station may be a macro base station, a femto base station or a pico base station.
  • a specific subset is already specified between the terminal and the base station, so that the terminal acquires channel state information for the specific subset.
  • the base station transmits changed configuration parameters different from the configuration parameters of the previous channel state information to the terminal (S800).
  • the changed configuration parameter value determines the reporting period and / or subframe offset of the channel state information.
  • a specific range of changed configuration parameters such as Table 14 or Table 15, is mapped to a specific combination of reporting periods and / or subframe offsets. Accordingly, the UE changes the reporting period and / or subframe offset (S805).
  • the terminal transmits channel state information on the designated subset to the base station based on the changed reporting period and / or the changed subframe offset (S810).
  • all kinds of subsets configured in the terminal are bound to the mapped reporting period and / or the mapped subframe offset.
  • a situation in which it is difficult for the base station to obtain desired channel state information may occur only by changing the configuration parameter of the channel state information. For example, if the base station cannot receive the reception frequency, resolution, etc. of the channel state information for each subset as necessary, or if the ABS pattern set in the serving cell is the channel state measurement and the like. Changes may occur for reasons of
  • the base station may change the designation of the subset. For example, suppose that the configuration of the subset is the first subset and the second subset, and the first subset is currently assigned to the terminal. The base station may designate a second subset to obtain desired channel state information in a given reporting period and subframe offset situation. That is, change the designation of the subset. In order to change the subset designation, the base station may transmit a subset indicator indicating the changed subset to the terminal.
  • the subset indicator may be sent in the form of higher layer signaling, eg, an RRC message, a MAC message. Alternatively, the subset indicator may be transmitted in the form of lower layer signaling, for example, physical layer signaling.
  • the base station can change the subset itself. For example, suppose that the configuration of the subset is the first subset and the second subset, and the first subset is currently assigned to the terminal.
  • the base station may transmit the changed third subset to the terminal in order to obtain desired channel state information in a given reporting period and subframe offset situation, and designate the third subset.
  • the third subset may be transmitted in a bitmap format.
  • the change of the subset itself may be performed by the RRC connection reconfiguration procedure.
  • the base station may change the ABS pattern for the subframe except for the subframe that should always be protected.
  • the base station may negotiate with an adjacent base station (or cell) that may affect the interference, and may change the ABS pattern within the limit that is not affected by the interference.
  • the information about the changed ABS pattern may be transmitted from the base station to the terminal by higher layer signaling, for example, RRC signaling.
  • the schemes (1), (2) and (3) may be applied independently or may be applied sequentially.
  • the scheduler of the base station may apply in the order (1)-> method (2)-> method (3).
  • the scheme (2) it is necessary to consider the setting parameter of the channel state information that can be changed due to the scheme (2).
  • scheme (3) consideration should be given to the configuration parameters of the subset or channel state information that may change due to scheme (3).
  • FIG. 9 is a flowchart illustrating a periodic transmission method of channel state information by a terminal according to an embodiment of the present invention.
  • the terminal determines whether there is a configuration parameter change, a subset change, or an ABS pattern change of channel state information (S900). If any one of a configuration parameter change, a subset change, and an ABS pattern change of channel state information is found, the terminal 'applies' the change to the terminal (S905).
  • the change of the configuration parameter of the channel state information may mean a change of the reporting period and / or the subframe offset of the channel state information.
  • 'application' refers to measuring a channel state based on a changed reporting period and / or a changed subframe offset.
  • 'apply' means that when the subset is changed, the UE designates the changed subset and measures the channel state in the subframe included in the changed subset.
  • 'apply' means that the terminal measures the channel state according to the changed ABS pattern when the ABS pattern is changed.
  • the terminal determines channel state information to be transmitted (S910).
  • a hole subframe When the UE transmits the channel state information, there may exist a subframe not included in all subsets as in subframe 4 of FIG. 7.
  • a hole subframe Assume that periodic transmission should occur in the next subframe of the hole subframe. Since the terminal cannot measure the channel state in the hole subframe, the terminal cannot transmit channel state information for the hole subframe in the next subframe. However, if there is a constraint that periodic transmission of channel state information should always be performed in the wireless system, the terminal should determine which subframe to transmit the channel state information instead of the hole subframe. For example, it is determined whether to transmit channel state information for subframe 3 or channel state information for subframe 2.
  • the base station and the terminal may determine 'channel state information to be transmitted' according to a predetermined protocol or by using higher layer signaling such as RRC signaling. Determination of channel state information is performed as follows.
  • the terminal determines the most recently obtained channel state information as 'channel state information to be transmitted'.
  • the UE may transmit the most recently obtained channel state information to a base station in any one of several subsets. For example, in FIG. 7, since the UE most recently acquires channel state information of subframe 3 in the first subset, the UE transmits channel state information of subframe 3 in subframe 5.
  • the terminal may transmit the most recently obtained channel state information to all the subsets to the base station. For example, in FIG. 7, since the UE most recently acquires channel state information of subframe 3 common to the first and second subsets, the UE transmits channel state information of subframe 3 in subframe 5.
  • the terminal determines the channel state information according to which subset of the channel state information transmitted immediately before. For example, if the immediately previous channel state information is for a subframe of the first subset, the terminal determines the most recently measured channel state information for the second subset as 'channel state information to be transmitted'.
  • the terminal determines 'channel state information to be transmitted' based on the number of transmission of channel state information for each subset.
  • the most recently measured channel state information for a subset having a small number of transmissions is determined as 'channel state information to be transmitted'. For example, when the number of transmissions of channel state information for the first subset is 5 and the number of transmissions of channel state information for the second subset is 3, the terminal receives the most recently measured channel state information in the second subset. send.
  • the above examples can be implemented by the terminal operating a merged subset (merged subset).
  • the merged subset is a subset of various kinds of subsets.
  • the terminal currently measures the channel state based on the first subset, the channel state for the second subset is also measured.
  • the terminal transmits the determined channel state information to the base station (S915). Transmission of the channel state information may be performed based on the changed reporting period and / or the changed subframe offset. Periodic channel state information may be transmitted through PUCCH or PUSCH.
  • the following four methods may be considered.
  • the four schemes are classified according to what restrictions are imposed on the measurement of channel conditions.
  • the default method is a case where the base station does not apply a limit to the terminal to measure the channel state. Accordingly, the terminal transmits channel state information to the base station according to a general periodic transmission scheme.
  • the base station may transmit information on the plurality of subsets to indicate the limited measurement in the terminal measuring the channel state.
  • a subset to be measured in the periodic channel state information reporting operation among the plurality of subsets may be limited to a single subset. Therefore, the terminal transmits the channel state information to the base station according to the configuration parameter of the channel state information bound to the specified subset limited to a single subset.
  • the other subsets except for the limited-specified subset may be used only for an operation that is not related to the periodic channel state information reporting operation (eg, aperiodic channel state information reporting).
  • the multiple subset binding method is when two or more subsets are bound to setting parameters of independent channel state information, respectively. Therefore, when the subset is designated, the terminal transmits the channel state information to the base station according to the configuration parameter of the channel state information bound to the specified subset.
  • the terminal may configure a merge subset by merging all of the currently set subsets, or may configure a merge subset that merges only the subsets specified by the base station. If only two subsets exist, the terminal may configure a merge subset in which the two subsets are merged even without separate signaling from the base station.
  • the terminal measures the channel state for the merge subset and transmits channel state information as a result of the measurement to the base station.
  • the base station may select to set one of the schemes (A) to (D) in the terminal.
  • FIG. 10 is a flowchart illustrating a process of selecting a periodic transmission method of channel state information by a base station according to an embodiment of the present invention.
  • the base station determines whether a reference value of the serving cell is greater than a threshold (S1000).
  • the reference value is a reference signal received power (RSRP) or reference signal received quality (RSRQ).
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • One example of a threshold is s-measure.
  • the s-measure is a comparison value used to perform RRM (Radio Resource Management) measurement for the neighbor cell. If the RSRP of the serving cell is larger than the s-measure, the UE does not perform the RRM measurement for the neighbor cell.
  • the serving cell may be a main serving cell or a secondary serving cell.
  • the base station selects the scheme (A) (S1005).
  • the base station determines whether the reference value of the serving cell is greater than the reference value of the neighbor cell (S1010). If the reference value of the serving cell is larger than the reference value of the neighbor cell, the base station determines the scheme (B) and scheme (based on any one of quality of service (QoS), transmission rate, and latency for downlink transmission). Any one of D) is selected, and either one of the method (C) and the method (D) is selected based on the resolution requirement (S1015). For example, if it is determined through the scheme (D) that the channel state information for each subset cannot satisfy the resolution requirement, the base station selects the scheme (D).
  • the terminal 600 and the base station 650 in FIG. 6 may each perform the following operation.
  • the downlink receiver 605 of the terminal 600 receives the changed configuration parameter for changing the configuration parameter of the channel state information from the base station 650.
  • the RRC connection reconfiguration unit 610 determines whether there is a configuration parameter change, a subset change, or an ABS pattern change of the channel state information. If any one of setting parameter change, subset change, and ABS pattern change of channel state information is found, the terminal applies the change to the terminal 600.
  • the channel state information constructing unit 615 determines the channel state information to be transmitted. As an example, the channel state information configuring unit 615 determines the most recently obtained channel state information as 'channel state information to be transmitted'. In one aspect, the channel state information configuring unit 615 may determine, as the channel state information, the channel state information most recently obtained in any one of the various subsets. In another aspect, the channel state information configuration unit 615 may determine the channel state information most recently obtained in all the subsets as the channel state information.
  • the channel state information configuring unit 615 determines the channel state information according to which subset of the channel state information transmitted immediately before. For example, if the channel state information transmitted immediately before is for a subframe of the first subset, the channel state information constructing unit 615 may refer to the channel state information most recently measured for the second subset as a 'channel to be transmitted. Status information '.
  • the channel state information configuring unit 615 determines 'channel state information to be transmitted' based on the number of transmission of the channel state information for each subset.
  • the most recently measured channel state information for a subset having a small number of transmissions is determined as 'channel state information to be transmitted'. For example, if the number of transmissions of channel state information for the first subset is 5 and the number of transmissions of channel state information for the second subset is 3, the channel state information configuration unit 615 is the most recent in the second subset. Transmit the measured channel state information.
  • the above examples may be implemented by the channel state information constructing unit 615 operating a merged subset.
  • the merged subset is a subset of various kinds of subsets.
  • the channel state information configuration unit 615 currently measures the channel state based on the first subset, the channel state information for the second subset is also measured.
  • the uplink transmitter 620 transmits the determined channel state information to the base station 650. Transmission of the channel state information may be performed based on the changed reporting period and / or the changed subframe offset. Periodic channel state information may be transmitted through PUCCH or PUSCH.
  • the RRC message generation unit 660 of the base station 650 generates a changed configuration parameter for changing the configuration parameter of the channel state information.
  • the downlink transmitter 655 transmits the changed configuration parameter to the terminal 600.
  • the channel state information request information generator 665 determines whether the reference value of the serving cell is greater than the threshold value.
  • the reference value is RSRP or RSRQ.
  • One example of a threshold is s-measure.
  • the s-measure is a comparison value used to perform the RRM measurement for the neighbor cell. If the RSRP of the serving cell is greater than the s-measure, the terminal 600 does not perform the RRM measurement for the neighbor cell.
  • the serving cell may be a main serving cell or a secondary serving cell.
  • the channel state information request information generation unit 665 selects the scheme (A).
  • the channel state information request information generator 665 determines whether the reference value of the serving cell is greater than the reference value of the neighbor cell. If the reference value of the serving cell is greater than the reference value of the neighbor cell, the channel state information request information generator 665 uses scheme (B) and scheme (D) based on any one of QoS, transmission rate, and delay for downlink transmission. Either one of the methods is selected, and one of the methods (C) and (D) is selected based on the resolution requirement. For example, if it is determined through the scheme (D) that the channel state information for each subset cannot satisfy the resolution request value, the channel state information request information generator 665 selects the scheme (D).
  • the uplink receiver 670 receives channel state information from the terminal 600.

Landscapes

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

Abstract

La présente invention concerne un procédé et un appareil destinés à la transmission d'informations d'état de canal dans un système de communication sans fil. Ledit procédé comprend : la réception, en provenance d'une station de base, d'informations indiquant un lien entre un ensemble de cellules comportant une cellule de desserte et un sous-ensemble incluant un secteur de trame ; l'élaboration d'informations d'état de canal pour le secteur de trame sur la cellule de desserte ; la réception, en provenance de la station de base, d'informations de demande d'informations d'état de canal indiquant l'ensemble de cellules ; et la transmission des informations d'état de canal à la station de base. Selon la présente invention, il est possible de mesurer avec précision les informations d'état de canal, qui varient à mesure que le temps passe, et de fournir les informations d'état de canal correspondant au moment souhaité par la station de base.
PCT/KR2012/000379 2011-01-17 2012-01-17 Appareil et procédé destinés à la transmission d'informations d'état de canal dans un système de communication sans fil WO2012099369A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/979,071 US20130294351A1 (en) 2011-01-17 2012-01-17 Apparatus and method for transmitting channel state information in a wireless communication system

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
KR10-2011-0004684 2011-01-17
KR20110004684 2011-01-17
KR10-2011-0012456 2011-02-11
KR20110012456 2011-02-11
KR10-2011-0013217 2011-02-15
KR1020110013217A KR20120083192A (ko) 2011-01-17 2011-02-15 무선통신 시스템에서 채널 상태 정보의 전송 장치 및 방법

Publications (2)

Publication Number Publication Date
WO2012099369A2 true WO2012099369A2 (fr) 2012-07-26
WO2012099369A3 WO2012099369A3 (fr) 2012-12-06

Family

ID=46516212

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2012/000379 WO2012099369A2 (fr) 2011-01-17 2012-01-17 Appareil et procédé destinés à la transmission d'informations d'état de canal dans un système de communication sans fil

Country Status (1)

Country Link
WO (1) WO2012099369A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014038801A1 (fr) * 2012-09-06 2014-03-13 엘지전자 주식회사 Procédé et terminal pour mesure de brouillage dans un réseau hétérogène comprenant une macro cellule et une cellule de petite taille co-existantes
WO2014052084A1 (fr) * 2012-09-28 2014-04-03 Intel Corporation Création de rapport de données d'état de canal périodiques pour des systèmes à agrégation de porteuses à duplexage par répartition dans le temps (tdd)
WO2015012900A1 (fr) * 2013-07-26 2015-01-29 Intel IP Corporation Signalisation d'informations d'interférence pour aider un matériel utilisateur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100075378A (ko) * 2008-12-24 2010-07-02 엘지전자 주식회사 제어 정보를 전송하는 방법 및 이를 위한 장치
KR20100082291A (ko) * 2009-01-08 2010-07-16 엘지전자 주식회사 Ｔｄｄ에 기반한 무선통신 시스템에서 데이터 중계 방법
KR20100091871A (ko) * 2009-02-11 2010-08-19 엘지전자 주식회사 무선통신 시스템에서 데이터 중계 방법
KR20100121445A (ko) * 2009-05-08 2010-11-17 엘지전자 주식회사 기준 신호에 대한 채널 정보를 전송하는 방법 및 장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100075378A (ko) * 2008-12-24 2010-07-02 엘지전자 주식회사 제어 정보를 전송하는 방법 및 이를 위한 장치
KR20100082291A (ko) * 2009-01-08 2010-07-16 엘지전자 주식회사 Ｔｄｄ에 기반한 무선통신 시스템에서 데이터 중계 방법
KR20100091871A (ko) * 2009-02-11 2010-08-19 엘지전자 주식회사 무선통신 시스템에서 데이터 중계 방법
KR20100121445A (ko) * 2009-05-08 2010-11-17 엘지전자 주식회사 기준 신호에 대한 채널 정보를 전송하는 방법 및 장치

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014038801A1 (fr) * 2012-09-06 2014-03-13 엘지전자 주식회사 Procédé et terminal pour mesure de brouillage dans un réseau hétérogène comprenant une macro cellule et une cellule de petite taille co-existantes
US9319919B2 (en) 2012-09-06 2016-04-19 Lg Electronics Inc. Method and terminal for measuring interference in heterogeneous network having co-existing macro cell and small-scale cell
WO2014052084A1 (fr) * 2012-09-28 2014-04-03 Intel Corporation Création de rapport de données d'état de canal périodiques pour des systèmes à agrégation de porteuses à duplexage par répartition dans le temps (tdd)
US9161254B2 (en) 2012-09-28 2015-10-13 Intel Corporation Periodic channel state information reporting for time division duplex (TDD) carrier aggregation systems
US9848351B2 (en) 2012-09-28 2017-12-19 Intel Corporation Periodic channel state information reporting for time division duplex (TDD) carrier aggregation systems
US9848353B2 (en) 2012-09-28 2017-12-19 Intel Corporation Periodic channel state information reporting for time division duplex (TDD) carrier aggregation systems
US11019522B2 (en) 2012-09-28 2021-05-25 Apple Inc. Periodic channel state information reporting for time division duplex (TDD) carrier aggregation systems
WO2015012900A1 (fr) * 2013-07-26 2015-01-29 Intel IP Corporation Signalisation d'informations d'interférence pour aider un matériel utilisateur
US9313812B2 (en) 2013-07-26 2016-04-12 Intel IP Corporation User equipment and evolved node-B supporting machine type communication and small data communication

Also Published As

Publication number Publication date
WO2012099369A3 (fr) 2012-12-06

Similar Documents

Publication Publication Date Title
WO2012111992A1 (fr) Appareil et procédé de transmission d'informations d'état de canal dans un système de communication sans fil
WO2018143760A1 (fr) Procédé de réalisation de mesure et équipement utilisateur
WO2012046997A1 (fr) Procédés et appareil d'activation de coordination de brouillage dans des réseaux hétérogènes
KR101925230B1 (ko) Hetnet 통신 시스템
WO2012138087A2 (fr) Dispositif et procédé de transmission d'informations de commande pour ajustement de brouillage entre cellules hétérogènes dans un système de communication sans fil
WO2018026224A1 (fr) Procédé pour qu'un terminal réalise une communication en liaison montante dans un système de communication sans fil, et terminal utilisant le procédé
WO2012091450A2 (fr) Procédés et appareils de requête de coordination de brouillage et de traitement de requête de coordination de brouillage entre cellules
WO2016036111A1 (fr) Procédé et appareil de gestion de ressources
WO2016163832A1 (fr) Procédé et dispositif de commande de puissance de transmission de système de communication sans fil au moyen de multiples antennes
WO2012060608A2 (fr) Procédé de coordination de brouillage entre cellules et station de base
WO2015065087A1 (fr) Appareil et procédé pour annuler un brouillage entre cellules dans un système de communication
WO2012064117A2 (fr) Procédé et dispositif de transmission et de réception d'un canal de commande de liaison descendante en vue de limiter l'interférence intercellulaire dans un système de communication sans fil
WO2013141624A1 (fr) Appareil et procédé pour la transmission de données de coordination d'interférences entre des cellules hétérogènes
WO2015009130A1 (fr) Procédé et appareil de communication coopérative dans un système de communication sans fil
WO2012093888A2 (fr) Dispositif et procédé permettant de sélectionner une cellule dans un système de communication sans fil
WO2014112716A1 (fr) Procédé pour effectuer une mesure en éliminant les interférences et terminal
KR20120083192A (ko) 무선통신 시스템에서 채널 상태 정보의 전송 장치 및 방법
WO2016053039A1 (fr) Procédé et appareil de transmission d'informations de système
WO2014077489A1 (fr) Procédé et terminal destinés à réaliser des mesures dans une zone d'extension de couverture de cellule à petite échelle lorsqu'une macrocellule et une cellule à petite échelle coexistent
WO2018026223A1 (fr) Procédé destiné à un terminal pour le rapport de marge de puissance dans un système de communication sans fil, et terminal mettant en œuvre ce procédé
WO2015111966A1 (fr) Système et procédé de transmission d'informations d'état de canal de multiples stations de base lte
WO2015020492A1 (fr) Procédé et appareil de commande de signalement adaptatif dans un environnement tdd
WO2012148192A2 (fr) Procédé pour la fourniture d'informations de contrôle de la puissance en liaison montante d'une station de base et procédé de contrôle de la puissance en liaison montante d'un équipement d'utilisateur, station de base associée et équipement d'utilisateur associé
WO2023027560A1 (fr) Procédé et dispositif de gestion de faisceau dans un système de communication sans fil
WO2014038755A1 (fr) Procédé d'évaluation de canal de liaison montante et système de communication

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12736564

Country of ref document: EP

Kind code of ref document: A2

WWE Wipo information: entry into national phase

Ref document number: 13979071

Country of ref document: US

NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12736564

Country of ref document: EP

Kind code of ref document: A2