WO2011090340A2 - Procédé et appareil pour émettre/recevoir des signaux dans un système d'antennes distribuées - Google Patents

Procédé et appareil pour émettre/recevoir des signaux dans un système d'antennes distribuées Download PDF

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Publication number
WO2011090340A2
WO2011090340A2 PCT/KR2011/000434 KR2011000434W WO2011090340A2 WO 2011090340 A2 WO2011090340 A2 WO 2011090340A2 KR 2011000434 W KR2011000434 W KR 2011000434W WO 2011090340 A2 WO2011090340 A2 WO 2011090340A2
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WIPO (PCT)
Prior art keywords
terminal
information
base station
ppi
antennas
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PCT/KR2011/000434
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English (en)
Korean (ko)
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WO2011090340A3 (fr
Inventor
강지원
임빈철
천진영
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020100047326A external-priority patent/KR101604702B1/ko
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to US13/575,020 priority Critical patent/US8867446B2/en
Publication of WO2011090340A2 publication Critical patent/WO2011090340A2/fr
Publication of WO2011090340A3 publication Critical patent/WO2011090340A3/fr
Priority to US14/446,610 priority patent/US9198047B2/en
Priority to US14/921,443 priority patent/US9621237B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving signals in a distributed antenna system.
  • a DAS method for eliminating shadow area and expanding coverage is provided by having a plurality of distributed antennas in an existing cell. Is being studied.
  • DAS Distributed Antenna System
  • a single base station is located at a distance of more than a predetermined distance inside a cell served by a base station.
  • a plurality of antennas are distinguished from a centralized antenna system (CAS) in which a plurality of base station antennas are centrally located in a cell in that a plurality of antennas are distributed at a distance apart from each other by a predetermined distance.
  • CAS centralized antenna system
  • CAS is generally a cellular-based system such as wideband code division multiple access (WCDMA), high speed packet access (HSPA), long term evolution (LTE) / long term evolution-advanced (LTE-A), and 802.16.
  • WCDMA wideband code division multiple access
  • HSPA high speed packet access
  • LTE long term evolution
  • LTE-A long term evolution-advanced
  • 802.16 802.16.
  • the DAS is distinguished from a femto cell in that each unit of a distributed antenna is responsible for all distributed antenna regions located in a cell at a base station in a cell center, rather than a region of the antenna itself.
  • each unit of a distributed antenna is responsible for all distributed antenna regions located in a cell at a base station in a cell center, rather than a region of the antenna itself.
  • a multi-hop relay system or an ad-hoc network is wirelessly connected between a base station and a remote station (RS).
  • RS remote station
  • each of the distributed antennas can transmit different signals to respective terminals adjacent to the antenna, which is also distinguished from a repeater structure that simply amplifies and transmits signals.
  • Such a DAS may be regarded as a kind of multiple input multiple output (MIMO) system in that distributed antennas may simultaneously transmit and receive different data streams to support a single or multiple mobile stations.
  • MIMO multiple input multiple output
  • the DAS is antennas distributed at various locations in a cell, and thus, a transmission area is reduced for each antenna as compared to the CAS, thereby reducing the transmission power.
  • by shortening the transmission distance between the antenna and the terminal to reduce the path loss to enable high-speed data transmission it is possible to increase the transmission capacity and power efficiency of the cellular system, and relatively to the CAS regardless of the position of the user in the cell It can satisfy the communication performance of uniform quality.
  • the base station and a plurality of distributed antennas are connected by a wired or dedicated line, signal loss can be reduced, and correlation and interference between antennas can be reduced, thereby having a high signal to interference plus noise ratio (SINR). .
  • SINR signal to interference plus noise ratio
  • the DAS reduces cellular base station cost and backhaul network maintenance cost in the next generation mobile communication system, and increases cellular service coverage, improves channel capacity, and SINR.
  • the present invention proposes a method for performing communication by transmitting system-related control information to terminals entering in a DAS cell to support a DAS.
  • the present invention also proposes a method of performing communication by transmitting information on a distributed antenna or antenna group independently allocated to each terminal or pilot pattern information for each antenna allocated to each terminal.
  • the present invention is to propose a method for generating and transmitting feedback information including antenna-related information by the terminal entering the DAS cell so that the DAS base station can efficiently allocate antenna resources for each terminal.
  • the present invention is to propose a method for performing channel estimation by converting the pilot pattern index used for each terminal transmitted from the DAS base station to a logical antenna index that is continuously listed so that the terminal can efficiently perform channel estimation do.
  • an aspect of the present invention provides a method for a terminal to receive a signal from a base station in a distributed antenna system (DAS).
  • the method comprises the steps of: 1) receiving control information regarding at least one effective transmit antenna assigned to the terminal among the plurality of antennas from the base station including a plurality of antennas; and 2) the at least one effective transmit antenna from the base station.
  • an aspect of the present invention provides a terminal for receiving a signal from a base station in a distributed antenna system (DAS).
  • the terminal includes a receiving module for receiving a signal and a distributed antenna of the base station used for downlink transmission based on a downlink signal received from a base station including a plurality of antennas positioned over a predetermined distance through the receiving module
  • a processor for generating feedback information relating to the transmitter and a transmission module for transmitting the feedback information to the base station, wherein at least one validity to be used for communication with the terminal among the plurality of antennas from the base station through the reception module; Control information regarding the transmit antenna can be received.
  • control information may include at least one of number information on the one or more effective transmit antennas, index information of the one or more effective transmit antennas, and signal reception strength information for each of the plurality of antennas. .
  • the terminal may map the at least one physical antenna index (PAI) to logical antenna indexes (LAI) according to a predetermined mapping rule.
  • the predetermined mapping rule may configure the LAI with an index of the effective transmit antenna according to the performance order according to the power gain for each effective transmit antenna.
  • control information may include one or more of one or more pilot pattern indexes (PPI) information supported for the terminal and PPI information affecting interference to the terminal.
  • PPI pilot pattern indexes
  • the terminal transmits feedback information including antenna-related information used for the downlink signal transmission based on the downlink signal received before the step 1) from the base station to the base station It may further comprise a step.
  • the control information may be determined based on the feedback information at the base station.
  • the feedback information is the signal reception strength for each of the plurality of antennas, the signal reception strength for one or more antennas the terminal of the plurality of antennas to use for feedback transmission, predetermined selection criteria It may include at least one of the number of antennas and / or index information that satisfies the candidate and the candidate PPI that satisfies a predetermined selection criteria.
  • the predetermined selection criterion may include whether a reception strength of a downlink signal received through some of the plurality of antennas is greater than or equal to a reference value.
  • the feedback information includes a Preferred Pilot Pattern Index (PPPI) requested by the terminal, wherein the PPPI is a reception of a channel estimated through a common pilot transmitted from the base station
  • PPPI Preferred Pilot Pattern Index
  • the strength or channel gain may include one or more PPIs that meet or exceed a predetermined reference value.
  • the feedback information includes channel state information estimated from each PPI included in the PPPI, a preferred order for one or more PPIs included in the PPPI, and a specific number of one or more PPIs included in the PPPI. It may further include at least one of the most preferred PPI of the and channel state information for the particular number of the most preferred PPI.
  • the specific number of the highest preference PPI may correspond to any one of system configuration parameter information, indication information determined and transmitted by the base station, and information arbitrarily determined by the terminal.
  • control information includes a set of indexes to be excluded among specific pilot pattern index (PPI) information supported for the terminal, the candidate PPI or the PPPI fed back from the terminal.
  • PPI specific pilot pattern index
  • e-PPI the index agreement indicator indicating whether the candidate PPI fed back from the terminal or the same PPI as the PPPI is used.
  • the control information may not include the specific PPI information and the e-PPI information.
  • the terminal may map the specific PPI to LAI according to a predetermined mapping rule.
  • the predetermined mapping rule may include configuring the LAI according to the performance order according to the power gain for each PPI.
  • the terminal may estimate the channel related information based on the converted LAI and may feedback the channel related information to the base station.
  • information about the predetermined mapping rule may be transmitted to the base station.
  • control information is configured independently for each terminal belonging to the DAS, and may be independently determined according to one or more of a location of the terminal and a frequency band used by the terminal.
  • the terminal when the terminal enters a cell area that provides a service at the base station, the terminal supports at least one of the DAS and the centralized antenna system from the base station; Indication information indicating that the device is present may be received. In this case, the indication information may be transmitted through the cell ID.
  • the antenna or the antenna group may be used interchangeably as an antenna port in LTE / LTE-A.
  • the DAS base station may perform communication by transmitting system-related control information to terminals entering the cell.
  • the DAS base station may perform communication by transmitting information on a distributed antenna or antenna group independently allocated to each terminal or pilot pattern information for each antenna allocated to each terminal according to DAS characteristics.
  • the terminal may generate and transmit feedback information including antenna-related information so that the base station can efficiently allocate antenna resources for each terminal.
  • the terminal can efficiently perform channel estimation by converting the pilot pattern index used for each terminal transmitted from the DAS base station into logical antenna indexes sequentially listed.
  • FIG. 1 is a diagram illustrating an example of a DAS structure to which the present invention is applied.
  • FIG. 2 is a diagram illustrating another example of a DAS structure to which the present invention is applied.
  • FIG. 3 is a diagram illustrating an example of a process of transmitting and receiving a signal between a base station and a terminal in a DAS according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating another example of a process of transmitting and receiving a signal between a base station and a terminal in a DAS according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating another example of a process of transmitting and receiving a signal between a base station and a terminal in a DAS according to an embodiment of the present invention.
  • FIG. 6 illustrates another example of a process of transmitting and receiving a signal between a base station and a terminal in a DAS according to an embodiment of the present invention.
  • FIG. 7 illustrates another example of a process of transmitting a signal to a terminal by a DAS base station according to an embodiment of the present invention.
  • FIG. 8 illustrates another example of a process of transmitting a signal to a terminal by a DAS base station according to an embodiment of the present invention.
  • FIG. 9 is a block diagram illustrating a base station and a terminal in which embodiments of the present invention can be performed.
  • a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), and the like.
  • the base station collectively refers to any node in the network stage that communicates with the terminal such as a Node B, an eNode B, a Base Station, and a Processing Server (PS).
  • UE user equipment
  • MS mobile station
  • PS Processing Server
  • FIG. 1 is a diagram illustrating an example of a DAS structure to which the present invention is applied.
  • the base station shown in FIG. 1 includes a plurality of antennas located in the center of a cell according to CAS, and are shown only for DAS antennas for simplicity of explanation.
  • a DAS having a plurality of antennas wired to a single base station located in a cell and distributed to various locations in a cell may be implemented in various ways according to the number and positions of the antennas. For example, a plurality of antennas may be distributed at regular intervals within a cell, or two or more antennas may be densely located at a specific place.
  • signal transmission of rank 2 or more is possible when the coverage of each antenna is overlapped regardless of how distributed antennas are located in a cell.
  • the rank represents the number of data streams that can be transmitted simultaneously through one or more antennas.
  • one base station serving one cell area is connected to a total of eight antennas in a wired manner, and each antenna may be located at a predetermined interval or various intervals over a predetermined distance in the cell.
  • each antenna may be located at a predetermined interval or various intervals over a predetermined distance in the cell.
  • an appropriate number of antennas may be used based on the signal transmission range of each antenna, the degree of coverage overlap and interference effect between adjacent antennas, and the distance between the antenna and the mobile terminal.
  • UE 1 when three terminals UE 1 to UE 3 are located in a cell as shown in FIG. 1 and UE 1 is located within a signal transmission range of antennas 1,2, 7, and 8, UE 1 is a base station.
  • the signal may be received from one or more of the antennas 1,2,7,8.
  • the antenna 3, 4, 5, 6 in the UE1 position because the distance between the antenna and the terminal is large, the path loss is likely to occur and the power consumption is increased, and the signals transmitted from the antennas 3, 4, 5, 6 are ignored. It can be as small as that.
  • UE 2 is located at a portion where the signal transmission ranges of antennas 6 and 7 overlap, so that signals transmitted through other antennas except antennas 6 and 7 are so small or weak that UE 3 is negligible. It can be located within close proximity to receive signals exclusively transmitted via antenna 3.
  • the DAS when the positions of a plurality of antennas in a cell are separated from each other, the DAS operates like a MIMO system.
  • the base station communicates with UE 1 through antenna group 1 consisting of one or more of antennas 1,2,7,8, antenna group 2 consisting of one or more of antennas 6,7 and UE 2, and antenna 3 with UE 3 simultaneously.
  • the antennas 4 and 5 may transmit or operate in a turned off state for the UE 3 and the UE 2, respectively.
  • the DAS system may vary in the number of data streams transmitted for each terminal when communicating with a single user / multiple users, and there may also be various antennas or antenna groups allocated to each mobile terminal located in a cell serviced by a base station.
  • An antenna or a group of antennas communicating with the terminal may be specified according to the location of the mobile terminal located in the cell, but may be adaptively changed according to the movement of the mobile terminal in the cell.
  • FIG. 2 is a diagram illustrating another example of a DAS structure to which the present invention is applied. Specifically, FIG. 2 illustrates an example of a system structure when a DAS is applied to a centralized antenna system using a multi-antenna based on a conventional cell.
  • a plurality of centralized antennas having a similar effect to path loss due to a very small antenna spacing compared to a cell radius in a center portion of a cell region adjacent to the base station in a cell region provided by the base station Antennas (CAs) may be located.
  • a plurality of distributed antennas (DAs) having a wider antenna spacing than CA and having different effects such as path loss may be located at intervals of a predetermined distance or more.
  • DA is composed of one or more antennas connected by one wire from a base station, and may be used in the same meaning as an antenna node or an antenna node for a DAS. That is, the antenna node includes one or more antennas, and one or more antennas constituting each antenna node are also wired. One or more DAs form one DA group to form a DA zone.
  • the DA group includes one or more DAs, and may be configured to be variable according to the location or reception state of the UE, or fixedly configured to the maximum number of antennas used in MIMO. In the case of IEEE 802.16m, the maximum number of antennas is 8 Tx.
  • the DA zone is defined as a range in which antennas forming the DA group can transmit or receive signals, and the cell region illustrated in FIG. 2 includes n DA zones.
  • the terminal belonging to the DA zone may communicate with at least one of the DAs configuring the DA zone, and the base station may increase the transmission rate by simultaneously using the DA and the CA when transmitting signals to the terminal belonging to the DA zone.
  • FIG. 2 illustrates a CAS including a DAS so that a base station and a UE may use a DAS in a conventional CAS structure using multiple antennas.
  • the positions of the CA and the DAs are illustrated to be separated for simplicity of description. It can be located in various ways depending on the implementation form.
  • the number of data streams per terminal may exist in the SU / MU MIMO communication, and a specific antenna or antenna group may be allocated to each terminal, and the specific antenna or antenna group allocated to the terminal is changed in real time. Can be.
  • the present invention determines a specific antenna or a group of antennas that can support communication with a corresponding terminal when the terminal enters a cell area in which a system supporting the DAS provides a service in a base station of the DAS system, and through signaling thereof
  • the present invention proposes a method of operating a DAS capable of transmitting and receiving a signal between a base station and a terminal belonging to the DAS.
  • the transmit antenna of the DAS may be one or more distributed antennas or antenna groups described above or may be mixed with one or more DA or DA groups described above.
  • the antenna / antenna group or the DA / DA group described above with reference to FIGS. 1 and 2 may be mixed to refer to one or more antenna ports.
  • the antenna or pilot pattern may be replaced with an antenna port.
  • One . First embodiment (antenna resource allocation through uplink signal measurement)
  • the DAS base station may determine a specific antenna or a group of antennas used for transmitting a downlink signal to the terminal based on the uplink signal transmitted from the terminal.
  • FIG. 3 is a diagram illustrating an example of a process of transmitting and receiving a signal between a base station and a terminal in a DAS according to an embodiment of the present invention.
  • a base station belonging to a DAS may perform ACK / NACK for data, pilot, feedback information, and data acknowledgment from a terminal that enters a cell area where a base station provides a service.
  • An uplink signal such as an Acknowledge / No-Acknowledge signal is received (S301).
  • the base station determines a transmission antenna for the corresponding terminal among all the antennas based on the result of measuring the strength of the received uplink signal.
  • antenna resources may be allocated in consideration of various conditions such as a load state of a base station, distribution in a cell of a terminal, and cooperation with an adjacent cell. For example, as the antenna resource allocation, one or more transmit antennas may be finally determined for each terminal or terminal group among all antennas of the base station (S302).
  • the base station transmits the DAS control information including the information on the transmission antenna corresponding to each terminal or terminal group through a control channel, preferably a dedicated control channel (S303).
  • a control channel preferably a dedicated control channel (S303).
  • Table 1 shows an example of the DAS control information according to an embodiment of the present invention.
  • Table 1 DAS control information i
  • the number of transmit antennas for a specific terminal or group of terminals ii Transmit antenna index information that the base station wants to use for a specific terminal or terminal group iii Signal reception strength information for each transmit antenna
  • DAS control information is i) the number of transmit antennas that the base station intends to use for the terminal, ii) the transmit antenna index information that the base station intends to use for the terminal, iii) transmission. It may include at least one of the signal reception strength for each antenna.
  • the DAS control information may be independent and vary for each terminal. Accordingly, the base station may transmit DAS control information according to a predetermined period or only when necessary, such as occurrence of an event in the terminal or the base station.
  • the base station may transmit a signal through a transmission antenna (or antenna group) specified according to the antenna allocation information for the corresponding terminal included in the DAS control information (S304).
  • the terminal may perform channel estimation for one or more transmission antennas specific to the terminal based on the received signal, and transmit the feedback information to the base station.
  • FIG. 4 is a diagram illustrating another example of a process of transmitting and receiving a signal between a base station and a terminal in a DAS according to an embodiment of the present invention.
  • the DAS base station may transmit antenna resource allocation information for allocating a specific antenna for each terminal among all antennas through pilot pattern information on the corresponding antenna.
  • a pilot includes a midamble independently configured for each antenna, a cell common reference signal (CRS), and a channel state information reference signal (CSI-RS). Signal).
  • Independent pilot patterns may be used for each antenna, or two or more antennas may use the same pilot pattern.
  • a terminal receiving a signal through the plurality of antennas may recognize this as a signal transmitted through one antenna. Therefore, when using a pilot pattern index (PPI) as the antenna resource allocation information, it may be represented by the number of independent pilot patterns allocated for antennas that can be effectively specified in the corresponding terminal, not the number of physical antennas. . For example, when the number of transmit antennas specified for one terminal is five and the same pilot pattern is allocated to three of the antennas, three PPIs for the terminal may be three.
  • PPI pilot pattern index
  • the base station receives an uplink signal such as data, pilot, feedback information, and an ACK / NACK signal for data acknowledgment from the terminal (S401), and measures the strength of the received uplink signal based on the result of the base station. Determining a transmission antenna for the corresponding terminal among all antennas (S402) corresponds to steps S301 and S302 of FIG. In this case, the base station may determine the pilot pattern used by the antennas for the corresponding terminal or terminal group rather than the antenna number and / or index information while allocating antenna resources for each terminal or terminal group. That is, as another example of antenna resource allocation, the PPI may be determined for each UE or UE group.
  • the same description will be omitted.
  • the base station transmits the DAS control information including the information on the transmission antenna for the terminal (S403).
  • Table 2 shows another example of the DAS control information according to an embodiment of the present invention.
  • another example of the DAS control information according to an embodiment of the present invention may include pilot pattern indexes (PPI) as transmission antenna allocation information for the corresponding terminal.
  • PPI pilot pattern indexes
  • the DAS control information may optionally further include information about a PPI (hereinafter referred to as an “interference PPI”) supporting another terminal near the corresponding terminal.
  • the interference PPI affects the target terminal but can be defined as, for example, a PPI that interferes with the target terminal because it supports other users.
  • the interfering PPI may or may not be transmitted differently from when the PPI is transmitted (eg, a period). After the UE receives the DAS control information including the PPI, scans signals transmitted through pilot patterns other than the PPI, and if the dominant signals can be determined as interference PPI, It may not include a separate interference PPI.
  • the terminal may derive information on the transmit antennas supported for the corresponding terminal among the base station antennas through the PPI.
  • the terminal generates feedback information by measuring channel related information such as channel quality information (CQI), precoding matrix index (PMI), and covariance matrix using PPI ( S404), it may be transmitted to the base station (S405).
  • CQI channel quality information
  • PMI precoding matrix index
  • S404 covariance matrix using PPI
  • the terminal may use the interference PPI to derive information on the interference antennas for the corresponding terminal, and determine feedback information such as PMI to reduce the interference.
  • the terminal may determine a PMI that may minimize interference effects from adjacent interference antennas and transmit feedback to the base station.
  • the terminal may determine the PMI that can maximize the interference effect from adjacent interference antennas and transmit feedback to the base station. That is, the feedback information may include information such as best / worst companion PMI of interfering antennas for the corresponding terminal.
  • the base station may transmit a downlink signal by configuring a precoding matrix for a transmission antenna allocated to a corresponding terminal in consideration of the PMI included in the feedback information to improve reception performance (S406).
  • the base station may transmit a signal by configuring a precoding matrix to minimize interference to a specific terminal when transmitting signals to other terminals using the interference antennas.
  • an antenna group for a corresponding terminal or an antenna group for another terminal may be changed.
  • the base station belonging to the DAS may determine the transmission antenna or antenna group for the terminal based on the feedback information on the antenna resource transmitted from the terminal.
  • FIG. 5 is a diagram illustrating another example of a process of transmitting and receiving a signal between a base station and a terminal in a DAS according to an embodiment of the present invention.
  • a terminal entering or moving in a cell area where a DAS base station provides a service receives a downlink signal transmitted through one or more distributed antennas from a base station.
  • the received signal may be measured to generate a feedback transmission.
  • An example of the feedback information may also include related information about the transmission antenna (S502).
  • Table 3 shows an example of feedback information generated by the UE belonging to the DAS according to an embodiment of the present invention.
  • the feedback information determined by the terminal includes: i) reception strength for all transmission antennas used in the downlink, ii) reception strength of the transmission antennas fed back by the terminal among all transmission antennas used in the downlink, and iii). Number of transmit antennas re-requested by the terminal, iv) number of transmit antennas satisfying the antenna resource selection criteria, v) index information of the transmit antennas re-requested by the terminal among all transmit antennas of the downlink, vi) all transmissions of the downlink It may include at least one of the index information of the transmit antenna satisfying the antenna resource selection criteria of the antennas.
  • Feedback information may be configured as a bitmap. When transmitting the transmission antenna index information of v) vi) through the bitmap, each bit constituting the bitmap may be configured to indicate the transmission antenna index.
  • an example of the antenna resource selection criterion may be the reception strength of the downlink signal, and may be selected as an antenna when the reception strength measured by the transmission antenna of each of the downlink transmission antennas for each transmission antenna is greater than or equal to a threshold.
  • the transmission antennas selected by the terminal according to the antenna resource selection criteria may include transmission antennas located at a distance adjacent to the terminal as an antenna used by the base station to support another terminal. It may also include antennas that support other DAS zones.
  • the terminal may transmit the above-described feedback information to the base station (S503).
  • the base station receiving the feedback information finally determines the downlink transmission antenna for each terminal.
  • the determination of the antenna resource allocation may be determined in the same manner as the received feedback information or in consideration of various conditions such as the feedback information and the load state of the base station, the distribution in the cell of the terminal, and the cooperation with neighboring cells, etc. S504).
  • the base station determines by considering the other conditions along with the feedback information, the transmission antennas selected by the terminal according to the antenna resource selection criteria are antennas used by the base station to support the other terminal is located at a distance adjacent to the terminal and the terminal; This is because it may also include antennas that affect interference between base stations.
  • the base station may transmit the DAS control information including the information on the transmission antenna finally determined for the terminal through a control channel, preferably a dedicated control channel (S505).
  • a control channel preferably a dedicated control channel (S505).
  • the DAS control information described above in Table 1 is only i) the number of transmit antennas that the base station intends to use for the terminal, ii) transmit antenna index information that the base station intends to use for the terminal, iii) signal strength information for each transmit antenna. In addition, iv) it may include information on the number of transmit antennas and / or indexes determined by the base station to use for the corresponding terminal among the transmit antennas transmitted by the terminal.
  • the DAS control information may be independent and vary for each terminal. Accordingly, the base station may transmit DAS control information according to a predetermined period or only when necessary, such as occurrence of an event in the terminal or the base station.
  • the base station may transmit the downlink signal using the transmission antenna finally determined for the terminal (S506).
  • the terminal belonging to the DAS may include the information on the pilot pattern in addition to the information on the transmission antenna, while transmitting the feedback information to the base station.
  • FIG. 6 illustrates another example of a process of transmitting and receiving a signal between a base station and a terminal in a DAS according to an embodiment of the present invention.
  • a terminal entering a cell area in which a DAS base station provides a service receives a downlink signal transmitted from the base station (S601).
  • the terminal derives index information of the pilot pattern detected by the terminal through the received downlink signal (S602).
  • the feedback information may further include PPI information regarding transmission antennas through downlink signal measurement in the?) Terminal as well as the feedback information described in Table 3 above.
  • the PPI determined by the terminal may not be the same as the PPI used when the actual base station transmits the downlink signal to the corresponding terminal.
  • the PPI is determined by the received signal from the terminal.
  • the candidate PPI determined by the terminal includes not only a PPI that can be efficiently used for communication between the terminal and the base station, but also an antenna located in an adjacent region of the terminal, which supports the communication with other terminals and interferes with the interference. can do.
  • the information on the interference PPI may be selectively included in the feedback information. For example, when the base station determines the PPI to use for the terminal in the process described below, the interference PPI can be derived by comparing with the PPI included in the feedback information, the interference PPI is not included in the candidate PPI generated in step S602 You may not.
  • the terminal transmits the generated feedback information to the base station (S603).
  • DAS control information for each terminal may be independent and variable. Therefore, the base station may transmit the DAS control information according to a predetermined period or only when necessary, such as occurrence of an event in the terminal or the base station.
  • the base station receiving the feedback information may finally determine a transmission antenna for the corresponding terminal in consideration of various conditions such as the load state of the base station, distribution in the cell of the terminal, and cooperation with an adjacent cell based on the feedback information ( S604).
  • the base station transmits the DAS control information including the information on the pilot pattern related to the transmission antenna finally determined for the terminal through the dedicated control channel (S605).
  • Pilot Pattern Indexes i) PPI for the determined transmit antennas; i) Excluded PPI for the PPI to be excluded among the feedback candidate PPIs; iii) Index Agreement Indicator.
  • Radio Resource Information for PPI Frequency / Time Division Resource Information of PPI Used 3) pilot sequence Multiple Orthogonal Pilot Sequences of PPI Determined 4) Additional Pilot Pattern Information Information about the pilot pattern added
  • DAS control information according to another embodiment of the present invention, 1) information on the PPI supported for communication with the terminal, i) a transmission antenna determined to use for communication with the terminal PPI information related to the PPI information, ii) a set of indices regarding PPIs to be excluded among the candidate PPIs fed back (hereinafter referred to as 'excluded PPI: e-PPI'), and iii) the same as the candidate PPIs included in the feedback information transmitted from the UE. It may include at least one of an index agreement indicator (AI) indicating whether to use a PPI.
  • AI index agreement indicator
  • the index agreement indicator indicates the use of the same PPI as the feedback candidate PPI, and if the index agreement indicator is set to '0', the feedback is returned. It may indicate using a PPI that is not the same as the candidate PPI.
  • the PAS information of i) may be included in the DAS control information.
  • the base station transmits the information on the PPI determined for the terminal in the DAS control information and transmits the antenna resource allocation information when the number of active terminals is larger than the number of base station antennas distributed in the cell area.
  • the base station may include the e-PPI information of ii) in the DAS control information. Since the terminal generates feedback information on channel quality according to downlink signal measurement and easy transmission antennas for the terminal, the base station does not transmit all of the PPI information determined for use for the terminal. Excluding the e-PPI information may be informed to the terminal. In this case, the index agreement indicator may be set to '0' or may not be included in the DAS control information.
  • the base station When transmitting the e-PPI, the base station separately signals to the terminal or includes in the DAS control information e-PPI information indicating whether PPIs excluded from the feedback information are interference PPIs supporting other terminals or are inactive. Can be sent. For example, when the base station determines to turn off specific antennas during a communication process with a corresponding terminal according to a predetermined criterion (for example, when an interference ratio of a specific antenna is greater than or equal to a predetermined criterion) among candidate PPIs that have been transmitted, The e-PPIs excluded from the feedback information may inform the terminal that they are inactive.
  • a predetermined criterion for example, when an interference ratio of a specific antenna is greater than or equal to a predetermined criterion
  • the e-PPI related information may be configured in a form of arranging indicators according to a preset order for PPIs excluded from the candidate PPIs fed back. For example, when the e-PPI related information is configured in a form of sequentially listing 1-bit indicators corresponding to each pilot pattern (for example, ascending or descending), when the e-PPI is set to '0', Inactive may be indicated, and if it is set to '1', it may indicate that it is an interference PPI.
  • the base station determines to use the same PPI as the candidate PPI included in the feedback information in the transmission antenna determination step (S604) for the terminal, by setting the above index agreement indicator to '1' and transmitting, the amount of transmission information is simplified can do.
  • the transmission of the e-PPI information as the information about the transmission antenna is efficient when the total number of antennas of the base station is larger than the number of active terminals located in the cell region. This is the same even when the base station uses only the same PPI fed back as the candidate PPI fed back, and transmits only the index agreement indicator without transmitting information about a separate PPI.
  • the base station may further include frequency / time division information of the pilot pattern used for the terminal in the DAS control information and transmit the same.
  • a radio resource can be multiplexed and allocated to each antenna or antenna group. For example, an FDM method using a divided frequency band or a TDM method divided into a time band can be used.
  • the base station may transmit resource information about a frequency band or a time band used for each of a plurality of specific antennas allocated to a specific terminal to the corresponding terminal.
  • the base station further includes pilot sequence information (eg, multiple orthogonal pilot sequence information) in the pilot pattern used for the corresponding UE in the DAS control information or pilot pattern information added when the pilot pattern is added.
  • pilot sequence information eg, multiple orthogonal pilot sequence information
  • the terminal may consider at least one of the frequency / time division information of the pilot pattern used for each terminal, pilot sequence information in the pilot pattern, and additional pilot pattern information among the above-described DAS control information.
  • the DAS control information may be transmitted only by the base station according to a predetermined period or only when necessary, such as when an event occurs in the terminal or the base station.
  • the base station may transmit a signal using a specific transmission antenna for communication with the corresponding terminal through the DAS control information (S607).
  • the terminal may transmit feedback feedback PPI information preferred to be used for communication with the base station.
  • PPI information preferred to be used for communication with the base station.
  • Table 5 shows another example of feedback information generated by a UE belonging to a DAS according to an embodiment of the present invention.
  • Table 5 feedback information i Receive Strength for All Transmit Antennas Used in Downlink ii Receive strength of one or more transmit antennas selected by a terminal among all transmit antennas used in downlink iii The number of transmit antennas that the terminal requests again iv Number of transmit antennas that meet antenna resource selection criteria v Index information of the transmit antenna re-requested by the terminal among all the downlink transmit antenna vi Index information of a transmission antenna that satisfies the antenna resource selection criteria among all transmission antennas of the downlink vii Preferred Pilot Pattern Indexes (PPPI) Information 1 Channel State Information estimated from each PPI in PPPI 2 Preferred Order of Pilot Pattern Indexes in PPPI 3 Among Pilot Pattern Indexes in PPPI A certain number of maximum preference patterns and their channel state information
  • Another example of feedback information according to an embodiment of the present invention is not only the feedback information described in Table 3 above, but also vii) Prefered Pilot Pattern Indexes regarding the transmission antennas determined by the UE. PPPI) information may be further included.
  • 'PPPI' may be defined as a pilot pattern index in which a reception intensity or channel gain of a channel estimated through a common pilot from a terminal point exceeds a predetermined threshold.
  • the information about the PPPI may not be included in the DAS control information, but may be transmitted at a predetermined cycle according to the speed of the terminal or the DAS antenna configuration, or as a separate signal when necessary, such as when an event occurs in the base station or the terminal.
  • the terminal is feedback information that can be provided by the base station to improve resource management performance such as scheduling and resource allocation between each terminal in the base station together with the PPPI.
  • 1 Channel State Information estimated from each PPI belonging to the PPPI.
  • CSI Channel State Information estimated from each PPI belonging to the PPPI.
  • CSI Channel State Information estimated from each PPI belonging to the PPPI.
  • CSI Channel State Information estimated from each PPI belonging to the PPPI.
  • CSI Channel State Information estimated from each PPI belonging to the PPPI.
  • CSI Channel State Information estimated from each PPI belonging to the PPPI.
  • CSI Channel State Information estimated from each PPI belonging to the PPPI.
  • CSI Channel State Information estimated from each PPI belonging to the PPPI.
  • a preferred order of pilot pattern indexes belonging to the PPPI a preferred order of pilot pattern indexes belonging to the PPPI
  • a specific number M of the maximum preferred patterns among the pilot pattern indexes belonging to the PPPI and their CSI information.
  • the CSI is general information related to the channel state and includes channel coefficients, channel gains, or covariance matrix or modulation and coding level information related thereto.
  • the CSI estimated from each PPI belonging to the PPPI of 1 is a feedback transmission of the state information of the channels estimated from the respective pilot patterns, and may be transmitted simultaneously or separately with the preferred order of the pilot pattern indexes belonging to the PPPI.
  • the information on the preferred order of PPIs belonging to the PPPI of 2 may be informed by transmitting ordered PPPIs listed in the preferred order when the PPPI is transmitted without separately signaling.
  • a specific number of maximum preferred pilot patterns and their CSI information correspond to a specific number of maximum preferred pilot patterns and the pilot pattern in order to reduce the overhead of information 1 and 2. It is to feed back channel status.
  • all terminals entering the corresponding cell may transmit the same number of maximum preferred pilot pattern index information.
  • the terminal may vary according to the indication information transmitted from the base station and is independent for each terminal. Can be.
  • the link quality may be determined by various criteria such as the number of CSIs exceeding a specific reference value, data requirements, and preferences.
  • the terminal is instructed to feed back only a certain number of PPPIs according to the indication of the base station among the PPPIs determined, or transmits a specific number of the maximum number of preferred pilot pattern index information, which is set at the time of initial setting for the system, to the ordered PPPI
  • a CSI (hereinafter, referred to as 'best-M CSI') for a predetermined number M of channels at the highest state may also be transmitted. That is, according to an embodiment of the present invention, the feedback information including the PPPI may include at least one of ordered PPPI, ordered PPPI, CSI corresponding to all PPPIs, and ordered PPPI and best-M CSI transmitted in a preferred order. .
  • the base station receiving the feedback information illustrated in Table 5 may transmit the DAS control information described in Table 4 to the terminal.
  • the DAS control information includes: i) PPI information about transmission antennas determined to be used for communication with the terminal, and ii) a set of indexes for PPIs to be excluded among the feedback PPPIs (hereinafter, 'excluded PPI: e- PPI '), and iii) at least one indicator indicating whether to use the same PPI as the PPPI transmitted from the terminal (hereinafter referred to as' index agreement indicator (AII)').
  • AII index agreement indicator
  • Such feedback information may be used when a base station belonging to a DAS determines to allocate a transmission antenna for each terminal, and may be transmitted by a predetermined period or when an event occurs in the terminal according to a terminal speed, a DAS antenna configuration, and the like.
  • feedback information may be transmitted to a base station through a physical uplink control channel (PUCCH) or a physical uplink control channel (PUSCH). Can be.
  • the feedback information according to the embodiment of the present invention includes an uplink primary fast feedback channel (PFBCH) or an uplink secondary fast feedback channel (SFBCH). It can be transmitted to the base station via. Or, it may be transmitted through a channel newly defined for the DAS.
  • PFBCH uplink primary fast feedback channel
  • SFBCH uplink secondary fast feedback channel
  • LAI logical antenna index
  • PPI physical antenna indexes
  • each UE may recognize and operate a DAS antenna based on PPI rather than PAI. That is, PAI and PPI may be distinguished from the terminal point of view.
  • each codebook should be mapped to antennas 1,2, 7, and 8, respectively, and an index for defining this process consistently and continuously is required.
  • each terminal uses the received PPI to provide channel related information such as CQI, PMI, and covariance matrix. It can be derived and sent back to the base station. Since the PPIs allocated for each terminal are an arbitrary subset of the available PPI sets, a consistent and continuous antenna index is required to use and measure channel-related information by using each terminal.
  • the DAS base station may use the LAI as index information about the base station antenna used for communication with each terminal.
  • the LAI may be configured as an integer from 0 to N_Tx (k) -1 or 1 to N_Tx (k).
  • a base station antenna corresponding to each terminal includes a transmission antenna used when a DAS base station transmits a downlink signal to a specific terminal, a base station antenna or transmission antenna that interferes with a specific terminal, and an interference antenna that interferes with a specific terminal.
  • UE 1 may receive a signal from one or more of antennas 1,2, 7, and 8, wherein antenna 7 supports UE 2 while being located in a coverage area capable of supporting UE 1. Accordingly, it may correspond to an interference antenna that may affect interference to UE 1. Therefore, the antenna corresponding to UE 1 may be antennas 1,2, 7, and 8 including both an antenna and an interference antenna used when the base station transmits data to UE 1.
  • the terminal may be divided into two types of different LAIs, such as a dedicated LAI and an interfering LAI. .
  • FIG. 7 illustrates another example of a process of transmitting a signal to a terminal by a DAS base station according to an embodiment of the present invention, and may be performed by the same process as the embodiment described above with reference to FIG. 4.
  • the base station receives an uplink signal from the terminal (S701), and determines a PPI for the corresponding terminal among all antennas of the base station based on the result of measuring the strength of the received uplink signal ( S702) and the step S703 of transmitting the DAS control information including the PPI as the information about the transmission antenna, correspond to steps S401 to S403 of FIG. Therefore, the same description will be omitted for simplicity.
  • the DAS control information may include the PPI to be used for each terminal described above in Table 2, and may optionally include information on the interference PPI affecting the corresponding terminal.
  • the terminal receiving the DAS control information performs a process of mapping the received PPI to the LAI (S704).
  • the process of mapping a PPI or PAI to an LAI may be configured in the ascending or descending order of the PPI or PAI, or may be mapped according to specific performance criteria such as power gain for each PPI.
  • the mapping of PPI or PAI to LAI may be performed in the same or independent manner in downlink and uplink.
  • the terminal may transmit information on the mapping rule of the LAI to the base station (S705).
  • the terminal may select a PMI from a coding matrix codebook based on the configured LAI, measure channel related information such as a CQI, a covariance matrix, generate feedback information, and transmit the generated feedback information to the base station (S706).
  • the feedback information may be transmitted simultaneously with the LAI mapping information or by separate signaling.
  • the base station may transmit a downlink signal to the terminal through the determined PPI (S707).
  • the terminal may convert the channel corresponding to the base station reception antenna PPI or PAI into LAI and use it for channel estimation and related precoding.
  • the base station may perform decoding by converting signals received from antennas corresponding to the received PPI or PAI of the terminal to LAI having a continuous characteristic.
  • the base station measures an uplink signal to determine an antenna specific to the corresponding terminal.
  • the terminal may select one or more antennas corresponding to the terminal itself from all the antennas of the base station based on the measurement result of the downlink signal, and perform mapping of the PPIs or PAIs to the LAIs of the corresponding antennas.
  • FIG. 8 illustrates another example of a process of transmitting a signal to a terminal by a DAS base station according to an embodiment of the present invention, and may be performed by the same process as the above-described embodiment of FIG. 6.
  • the terminal receives a downlink signal transmitted from a base station (S801).
  • information about the transmitting antenna may be generated by measuring the received signal and selecting antennas that satisfy a reception strength of a predetermined value or more (S802) and then transmitted to the base station (S803).
  • the base station receiving the uplink signal including the feedback information may determine an antenna that may be specified for communication with the corresponding terminal through the feedback information and the uplink reception strength (S804).
  • the base station transmits the DAS control information including the information on the transmission antenna finally determined for the terminal to the terminal (S805).
  • the terminal that has received the information about the transmission antenna determined through the DAS control information performs a process of mapping the received PPI to the LAI (S806).
  • the UE may feedback the LAI mapping information indicating that the UE is mapped to the LAI based on the power gain magnitude of each PPI (S807).
  • the UE feedback-transfers the preferred pilot pattern index (PPPI) in the order of preference in step S802 and maps the PPI to the LAI according to the PPI preference order
  • the base station maps the PPI to the LAI in the received PPI order. Since the mapping information can be derived, it is not necessary to transmit separate mapping information as in step S806.
  • the physical antenna index (PAI), the pilot pattern index (PPI), and the logic for one UE may not be the same for each UE according to the range of LAI accordingly.
  • Antenna index (LAI) may not be the same.
  • the base station may transmit a downlink signal to the terminal using a transmission antenna determined to be used for the terminal (S809).
  • the UE may convert a channel corresponding to a PPI (or PAI) for the uplink reception antenna into an LAI, perform channel estimation using the converted LAI, and transmit a precoded signal to a base station.
  • the base station receiving the signal may perform decoding by converting a signal received from antennas corresponding to the received PPI (or PAI) of the terminal into an LAI having a continuous characteristic.
  • an antenna port index may be mapped to an LAI.
  • PAI antenna port index
  • an antenna resource allocation used for one UE may be configured differently for each frequency band by applying a case of using the FDM scheme when allocating radio resources.
  • feedback information and / or DAS control information according to embodiments of the present invention may be transmitted for each frequency band.
  • an indicator indicating whether the feedback information and / or the DAS control information of the remaining frequency band other than the specific frequency band is different from that of the specific frequency band it is possible to reduce the amount of transmission information or increase the transmission accuracy. That is, whether or not the feedback information and / or DAS control information is transmitted in a specific frequency band for the terminal, and is independent of the feedback information and / or DAS control information transmitted in the specific frequency band in the remaining frequency band except the specific frequency band An indicator indicating a may be transmitted.
  • the feedback information and / or the DAS control information to be transmitted in the corresponding frequency band may be transmitted only when the information transmitted in the divided frequency band is not the same without transmitting a separate indicator.
  • Such embodiments of the present invention may be performed in an independent network consisting of DAS cells only in a system supporting DAS or may be mixed with a system supporting an existing CAS.
  • the base station may transmit information indicating that the system supports the DAS for the terminals entering the cell.
  • the cell area when the terminals first enter a cell supported by the DAS, the cell area includes broadcast information including cell ID information and DAS support indication information indicating whether the corresponding system supports the DAS. I can broadcast it.
  • the broadcast information may include a cell ID number, DAS support indication information, pilot pattern information used in a corresponding cell, maximum pilot pattern information to be supported, and the like.
  • the base station may directly indicate whether the base station supports CAS or DAS for terminals initially entering the cell through the DAS support indication information.
  • the DAS support indication information may be included in the cell ID information.
  • the cell ID is configured to include information for distinguishing the CAS and the DAS, such that the terminal receiving the cell ID supports the current CAS or the DAS through the cell ID. It can be derived whether it supports
  • cell IDs are classified hierarchically according to base station types such as macrocell BS, hotzone BS, and femtocell BS.
  • a cell ID corresponding to the base station may be configured according to the type of the base station, and may be classified into upper or lower layers to indicate whether the base station supports CAS or DAS.
  • the cell ID is broadcast through the PA-preamble and the SA-preamble.
  • base stations transmit a cell ID to a cell area through a CRS.
  • some of the signals constituting the cell ID may be allocated as a signal indicating that the system supports the DAS.
  • separate cell IDs may be configured by classifying CAS and DAS.
  • FIG. 9 is a block diagram illustrating a base station and a terminal in which embodiments of the present invention can be performed.
  • the terminal may operate as a transmitter in uplink and as a receiver in downlink.
  • the base station may operate as a receiving device in the uplink, and may operate as a transmitting device in the downlink. That is, the terminal and the base station may include a transmitter and a receiver for transmitting information or data.
  • the transmitting device and the receiving device may include a processor, a module, a part, and / or means for carrying out the embodiments of the present invention.
  • the transmitting apparatus and the receiving apparatus may include a module (means) for encrypting a message, a module for interpreting an encrypted message, an antenna for transmitting and receiving a message, and the like.
  • the left side shows a base station belonging to a DAS in a structure of a transmitting apparatus
  • the right side shows a terminal entering a cell served by a DAS base station in a structure of a receiving apparatus.
  • the transmitter and receiver may include antennas 901 and 902, receiver modules 910 and 920, processors 930 and 940, transmitter modules 950 and 960, and memories 970 and 980, respectively.
  • the antennas 901 and 902 are reception antennas for receiving a radio signal from the outside and transmitting the signals to the reception modules 910 and 920 and a transmission antenna for transmitting the signals generated by the transmission modules 950 and 960 to the outside. It is composed. Two or more antennas 901 and 902 may be provided when a multiple antenna (MIMO) function is supported.
  • MIMO multiple antenna
  • the antenna 901 of the transmitter illustrated in FIG. 9 represents one or more DAs selected based on a channel state, a location of a terminal, a distance between the base station and the terminal, etc. during communication among all the antennas of the base station.
  • the selected one or more DAs may be changed according to a change in position of the receiving apparatus, which is not fixed.
  • the receiving module 910 or 920 may decode and demodulate the radio signal received through the antenna from the outside, restore the original data to form the original data, and transmit the decoded data to the processors 930 and 940.
  • the receiving module and the antenna may be represented as a receiving unit for receiving a radio signal without being separated as shown in FIG. 9.
  • Processors 930 and 940 typically control the overall operation of the transmitter or receiver.
  • a controller function for performing the above-described embodiments of the present invention a medium access control (MAC) frame variable control function, a handover function, an authentication and encryption function, etc. according to service characteristics and a propagation environment may be performed.
  • MAC medium access control
  • the transmission modules 950 and 960 may perform predetermined coding and modulation on data scheduled from the processors 930 and 940 and transmitted to the outside, and then transmit the data to the antenna.
  • the transmitter module and the antenna may be represented as a transmitter for transmitting a radio signal without being separated as shown in FIG.
  • the memory 970 and 980 may store a program for processing and controlling the processor 930 and 940, and input / output data (in the case of a mobile terminal, an UL grant allocated from a base station, A function for temporarily storing system information, a station identifier (STID), a flow identifier (FID), an operation time, and the like may be performed.
  • a program for processing and controlling the processor 930 and 940 and input / output data (in the case of a mobile terminal, an UL grant allocated from a base station, A function for temporarily storing system information, a station identifier (STID), a flow identifier (FID), an operation time, and the like may be performed.
  • the memories 970 and 980 may include a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (eg, SD or XD memory). Etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EPEROM), programmable read-only memory (PROM), At least one type of storage medium may include a magnetic memory, a magnetic disk, and an optical disk.
  • RAM random access memory
  • SRAM static random access memory
  • ROM read-only memory
  • EPEROM electrically erasable programmable read-only memory
  • PROM programmable read-only memory
  • At least one type of storage medium may include a magnetic memory, a magnetic disk, and an optical disk.
  • the processor 930 of the transmitting end performs an overall control operation for the base station, and performs antenna resource allocation for selecting a transmission antenna or an antenna group for each terminal according to the embodiments of the present invention described above with reference to FIGS. 3 to 8.
  • a pilot pattern index (PPI) corresponding to each terminal may be configured.
  • the processor 930 of the transmitting end may configure the DAS control information including configuration information on the DAS system, information on an antenna or antenna group to be used for communication with each terminal, or information on a PPI.
  • the receiving apparatus receives a signal transmitted from the transmitting apparatus and the DAS control information through the receiving module 920, and thus, various setting information about the DAS system and information about an antenna or an antenna group used to perform communication with the transmitting apparatus. Can be obtained.
  • the processor 940 of the receiving apparatus performs the overall control operation of the terminal, and generates feedback information about the channel state by measuring the downlink signal transmitted from the transmitting apparatus. Further, according to the embodiments described above with reference to FIGS. 5 to 6, the base station antenna corresponding to the receiver may be determined through the reception strength of the downlink signal, and information about the base station antenna may be informed to the transmitter. In addition, according to the embodiments described above with reference to FIGS. 7 to 8, PPI or PAI transmitted from a transmitter may be converted into LAI, and feedback information may be generated based on the converted LAI and transmitted to the transmitter.
  • the base station is a controller function for performing the above-described embodiments of the present invention, orthogonal frequency division multiple access (OFDMA) packet scheduling, time division duplex (TDD) packet scheduling and channel multiplexing function MAC frame variable control function according to service characteristics and propagation environment, high speed traffic real time control function, handover function, authentication and encryption function, packet modulation and demodulation function for data transmission, high speed packet channel coding function and real time modem control function Etc.
  • OFDMA orthogonal frequency division multiple access
  • TDD time division duplex
  • MAC frame variable control function according to service characteristics and propagation environment
  • high speed traffic real time control function handover function
  • authentication and encryption function packet modulation and demodulation function for data transmission
  • high speed packet channel coding function and real time modem control function Etc may be performed through at least one of the above-described modules, or may further include additional means, modules or parts for performing such a function.
  • Embodiments of the present invention may be used in a base station or terminal, or other equipment in a wireless communication system.

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Abstract

L'invention concerne un terminal qui reçoit des signaux d'une station de base, et un procédé selon lequel le terminal reçoit des signaux de la station de base dans un système d'antennes distribuées (DAS). Le terminal reçoit, d'une station de base comportant une pluralité d'antennes, des informations de commande concernant une ou plusieurs antennes de transmission actives affectées au terminal, parmi ladite pluralité d'antennes, et reçoit des signaux provenant de la station de base par l'intermédiaire de l'antenne/des antennes de transmission active(s).
PCT/KR2011/000434 2010-01-25 2011-01-21 Procédé et appareil pour émettre/recevoir des signaux dans un système d'antennes distribuées WO2011090340A2 (fr)

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US13/575,020 US8867446B2 (en) 2010-01-25 2011-01-21 Method and apparatus for transceiving signals in a distributed antenna system
US14/446,610 US9198047B2 (en) 2010-01-25 2014-07-30 Method and apparatus for transceiving signals in a distributed antenna system
US14/921,443 US9621237B2 (en) 2010-01-25 2015-10-23 Method and apparatus for transceiving signals in a distributed antenna system

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US29815710P 2010-01-25 2010-01-25
US61/298,157 2010-01-25
KR10-2010-0047326 2010-05-20
KR1020100047326A KR101604702B1 (ko) 2010-01-25 2010-05-20 분산 안테나 시스템에서의 신호 송수신 방법 및 장치

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US201213575020A Continuation 2010-01-25 2012-07-24
US14/446,610 Division US9198047B2 (en) 2010-01-25 2014-07-30 Method and apparatus for transceiving signals in a distributed antenna system

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WO2019009471A1 (fr) * 2017-07-05 2019-01-10 원광대학교산학협력단 Procédé et dispositif d'exploitation de sous-ensemble d'antennes dans des communications mobiles de nouvelle génération

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