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WO2013011763A1 - Système de communication sans fil, dispositif sans fil, terminal et procédé de communication sans fil - Google Patents

Système de communication sans fil, dispositif sans fil, terminal et procédé de communication sans fil Download PDF

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Publication number
WO2013011763A1
WO2013011763A1 PCT/JP2012/064560 JP2012064560W WO2013011763A1 WO 2013011763 A1 WO2013011763 A1 WO 2013011763A1 JP 2012064560 W JP2012064560 W JP 2012064560W WO 2013011763 A1 WO2013011763 A1 WO 2013011763A1
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WIPO (PCT)
Prior art keywords
transmission
combination
terminal
wireless communication
radio
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Ceased
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PCT/JP2012/064560
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English (en)
Japanese (ja)
Inventor
宮谷　徹彦
笹木　高広
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NEC Corp
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NEC Corp
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Publication of WO2013011763A1 publication Critical patent/WO2013011763A1/fr
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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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
    • 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
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Definitions

  • the present invention relates to a technique for efficiently performing downlink transmission in a wireless communication system in which all or some of a plurality of service areas (transmission points) to which the same cell identification number is assigned overlap.
  • LTE Long Term Evolution
  • MIMO Multiple Input Multiple Output
  • a precoding matrix is applied to improve radio characteristics.
  • Non-Patent Document 1 a mechanism is prepared in which the user terminal feeds back the optimum precoding matrix number (Precoding Matrix Indicator, PMI) selected from a finite number of precoding matrices specified in advance to the system side.
  • PMI Precoding Matrix Indicator
  • CQI Channel Quality Indicator
  • the identifier indicating the rank number is called Rank indicator; RI.
  • the above PMI / RI / CQI is reported by feedback from the user terminal, and downlink transmission is optimal It is controlled to be done.
  • CSI Channel-State Information
  • Transmission Mode 9 is newly defined, and not only the existing reference signal (CRS: Cell-specific Reference Signal) used for decoding the control channel common to cells, but also CSI-RS. PMI / RI / CQI can be obtained based on a new reference signal called The CSI-RS is transmitted by being orthogonalized so that each transmission antenna can be recognized individually.
  • CRS Cell-specific Reference Signal
  • 3GPP TS 36.211 V10.0.0 for example, 6.3.4
  • 2011.03 3GPP TS 36.213 V10.0.1 for example, Chapter 7.2
  • FIG. 1 is an example of a system configuration in which three service areas exist hierarchically, and it is assumed that the same cell identification number is assigned to these three service areas.
  • This system configuration is presented as a scenario 4 of CoMP (Coordinated multi-point transmission and reception) in Non-Patent Document 3.
  • two service areas constructed by two RRHs are arranged in a service area constructed by a macro base station (hereinafter simply referred to as a base station). Yes.
  • a service area constructed by a base station is generally called a macro cell.
  • the service area constructed by RRH is referred to as a small cell for convenience in this specification. The small cell does not mean that the macro cell and the cell identification number are different.
  • FIG. 1 shows an example in which the number of physical antennas of the base station is four, but these antennas are intended as correlation antennas.
  • two antennas with a +45 degree polarization plane are considered as one antenna when radio waves reach the user terminal due to correlation, and two antennas with a -45 degree polarization plane are also considered as one antenna.
  • the number of base station antennas observed at the terminal is substantially two antennas, and the antenna number is (0, 1).
  • Two RRHs also have two antennas, and the antenna numbers are (2, 3) and (4, 5), respectively.
  • this example is an example of CoMP scenario 4, and a system configuration in which the number of physical antennas of the base station is two and three small cells are provided may be cited as an example. Note that the total number of antennas in the entire system need not be eight.
  • two small cells arranged in the macro cell are assigned the same cell identification number as the macro cell.
  • the same control channel and broadcast information as the macro cell are transmitted from the transmitter in the small cell.
  • the same signal is received redundantly from the macro cell and the small cell, but since these signals are not received as interference, the reception level is increased.
  • the user terminal receives a signal indicating that the number of CRS ports is 2 wherever it is in the small cell.
  • control channel and broadcast information are not limited to being transmitted from both the macro cell and the small cell, and may be transmitted only from the macro cell or only from the small cell.
  • the CRS port is 2.
  • the system configuration of FIG. 1 can perform 2 ⁇ 2MIMO multiplex transmission at two locations, and the system throughput can be expected to be greatly improved as compared with a system configuration in which 2 ⁇ 2MIMO multiplex transmission can be performed only at one location within the same macro cell. .
  • the antenna numbers required for the two small cells in FIG. 1 are the RRH antenna numbers (2, 3) and (4, 5), respectively.
  • the number of antennas that can be recognized in the cell to which the user terminal belongs is the number of antennas that transmit the CSI-RS (2 antennas of base station and 2 antennas of RRH.
  • the system transmits CSI-RS of 6 antenna identifiers corresponding to antenna numbers 0, 1, 2, 3, 4 and 5) .
  • the user terminal does not know which two antennas are selected to achieve the optimum throughput for the system.
  • the signal level received from the RRH is not necessarily higher than the signal level received from the base station, and there is no guarantee that two RRH antennas will be selected.
  • the preferred antenna group (service area) based on the uplink signal level received by the base station is not necessarily downlinked.
  • the antenna group (service area) is not necessarily optimal from the viewpoint of the system throughput of the link. This can be understood by assuming the case where the signal level of the signal transmitted from the user terminal is measured at each of the base station and RRH in the state of FIG. In FIG.
  • the signal transmitted from the user terminal reaches each of the base station and RRH, but the signal level received by RRH is high (or the signal level received by the base station is below the noise level). This means that the received power from the base station and the RRH antennas received by the user terminal is not the same.
  • Codebook Subset Restriction limits the possible combinations of PMI in order to reduce the processing load on the user terminal. Codebook Subset Restriction is introduced in Non-Patent Document 2 and Non-Patent Document 4.
  • the current Codebook subset restriction requires CSI using all 8 antennas. Moreover, the antenna number used when obtaining CSI for each service area cannot be changed.
  • TM9 described above is allowed to perform arbitrary precoding, strictly speaking, it is not essential to obtain the above CSI. However, even in TM9, there are many cases where transmission using CSI is good. In other words, assuming MIMO multiplexing transmission in a plurality of local areas, which is a problem in the present invention, the number of antennas is limited in the local area, so when quoting FIG. .
  • an object of the present invention is to solve at least one of the above-described problems and to obtain transmission path associated information corresponding to a service area to be used as a system in a terminal, a wireless communication system, a wireless device, a terminal, To provide a wireless communication method.
  • the first wireless communication system of the present invention includes: N (N is a natural number greater than or equal to 2) service areas assigned with the same cell identification number, and at least one of each of the N service areas, a radio having a transmission antenna, A wireless communication system having a terminal that communicates with the wireless device within a service area, wherein all or part of the N service areas overlaps, At least one of the radios is Notification means for notifying the terminal of the combination of the transmission antennas; The terminal Feedback means for feeding back to the radio the transmission path associated information obtained using the combination of transmitting antennas notified from the notification means.
  • the second wireless communication system of the present invention is N (N is a natural number greater than or equal to 2) service areas assigned with the same cell identification number, and at least one of each of the N service areas, a radio having a transmission antenna, A wireless communication system having a terminal that communicates with the wireless device within a service area, wherein all or part of the N service areas overlaps,
  • the terminal Storage means for storing in advance the combination of the transmission antennas; Feedback means for feeding back to the radio the transmission path associated information obtained using the combination of transmission antennas stored in the storage means.
  • the radio of the present invention In a wireless communication system in which all or a part of N (N is a natural number of 2 or more) service areas to which the same cell identification number is assigned overlaps, a wireless device that constructs the service area and includes a transmission antenna There, A notification unit configured to notify the terminal of a combination of transmission antennas used when the terminal obtains transmission path associated information;
  • the terminal of the present invention In a wireless communication system in which all or a part of N (N is a natural number of 2 or more) service areas with the same cell identification number are overlapped, communication is performed within the service area with a radio device having a transmission antenna.
  • the first wireless communication method of the present invention includes: In a wireless communication system in which all or some of N (N is a natural number of 2 or more) service areas with the same cell identification number are overlapped, a wireless device that constructs the service area and includes a transmission antenna is provided. A wireless communication method to perform, The terminal notifies the terminal of a combination of transmission antennas used when the transmission path associated information is obtained.
  • the second wireless communication method of the present invention includes: In a wireless communication system in which all or a part of N (N is a natural number of 2 or more) service areas with the same cell identification number are overlapped, communication is performed within the service area with a radio device having a transmission antenna. A wireless communication method performed by a terminal, Pre-store the transmission antenna combination, The transmission path associated information obtained using the stored combination of transmission antennas is fed back to the radio.
  • the wireless device notifies the terminal of the combination of transmission antennas, and the terminal transmits the transmission path associated information obtained using the notified combination of transmission antennas to the wireless device. provide feedback.
  • the terminal stores the transmission antenna combination in advance, and feeds back the transmission path associated information obtained using the stored transmission antenna combination to the wireless device.
  • the terminal can obtain the transmission path associated information using a combination of transmission antennas corresponding to the service area to be used as the system.
  • FIG. 1 is a diagram illustrating an example of a configuration of a wireless communication system according to first to third embodiments of the present invention.
  • FIG. It is a block diagram which shows an example of a structure of the base station shown in FIG. It is a figure which shows an example which has arrange
  • FIG. 3 is a figure which shows the structure of the radio
  • the radio communication system of the present embodiment has the same system configuration as that of FIG. 1, and it is excluded to apply RRH to a base station 10 (a macro radio unit to be described later in the base station 10).
  • a small cell 200A, 200B which can be either a plurality of optical fibers or a single optical fiber as in a single stroke.
  • the base station 10 and the RRHs 20A and 20B are examples of the wireless device of the present invention.
  • the base station 10 includes a storage unit 11, a control unit 12, and a macro radio unit 13.
  • the storage unit 11 is a part that stores various types of information.
  • the control unit 12 is a part that controls various components in the base station 10 and performs various processes, and includes a baseband unit that is connected to the RRHs 20A and 20B via the optical fibers 40A and 40B.
  • the baseband part is composed of one or a plurality of baseband parts. Precoding matrix calculation in MIMO multiplex transmission is performed in this baseband part.
  • the baseband unit also generates CRS, CSI-RS, etc., and also generates and decodes signals that should be common between RRH20A, 20B and base station 10 and signals that should be independent. ing.
  • the control unit 12 also includes antenna configuration condition determining means of the present invention.
  • the macro wireless unit 13 is a part that performs wireless communication with the user terminal 30, and is an example of the notification means of the present invention.
  • the macro radio unit 13 includes four transmission / reception units so that transmission / reception can be performed from four antennas.
  • the number of antennas visible from the user terminal 30 outside the small cell area is two.
  • FIG. 5 shows an example in which four antennas are arranged so as to be correlated.
  • the RRHs 20A and 20B have a storage unit 21, a control unit 22, and an RRH radio unit 23.
  • the storage unit 21 is a part that stores various types of information.
  • the control unit 22 is a part that performs various processes by controlling the components in its own RRH20. Signals that should be common to the RRHs 20A and 20B and the base station 10 are performed by the control unit 12 of the base station 10 as described above.
  • the RRH radio unit 23 is a part that performs radio communication with the user terminal 30, and is an example of a notification unit of the present invention.
  • RRH20A, 20B should just have the RRH radio
  • the storage unit 21 may be provided in the base station 10.
  • a function corresponding to the control unit 22 is provided in the base station 10, and an interface unit 24 (not shown) serving as an interface for communicating control signals and baseband signals with the base station 10 is provided in the RRHs 20A and 20B. Also good.
  • the user terminal 30A includes a storage unit 31, a control unit 32, and a terminal radio unit 33.
  • the storage unit 31 is a part that stores various types of information.
  • the terminal radio unit 33 is a part that performs radio communication with the base station 10 and the RRH 20, and is a part of the feedback means of the present invention.
  • the control unit 32 is a part that controls various components in the user terminal 30A and performs various processes. For example, when connecting to the macro cell 100, the control unit 32 first receives system broadcast information as an initial stage. At this time, the control unit 32 decodes broadcast information and broadcast information as a result of superimposing two antennas from the base station 10 (four antennas but two antennas due to correlation) and two antennas from the RRH 20A.
  • the reference signal CRS is recognized as a total of two antennas because the transmission source antennas cannot be distinguished from each other.
  • control unit 32 After decoding the broadcast information, the control unit 32 exchanges individual user-specific information (for example, how much processing capability the user terminal 30A has) with the system side, and then downloads when necessary. Link or uplink communication is performed.
  • individual user-specific information for example, how much processing capability the user terminal 30A has
  • the control unit 32 selects an optimal precoding matrix from pre-defined precoding matrices, and corresponds to the selected precoding matrix number (PMI) Find CQI.
  • the terminal radio unit 33 feeds back these PM / CQI and RI as CSI (transmission path associated information).
  • the feedback destination may be the base station 10, the RRH 20A, or both the base station 10 and the RRH 20A.
  • the system side basically performs downlink communication using the CSI fed back from the user terminal 30A (Non-Patent Document 1).
  • the configuration of the user terminal 30B is the same as that of the user terminal 30A.
  • the problem is that when the user terminals 30A and 30B perform MIMO multiplex transmission in the respective small cells 200A and 200B, the current system regulations require that the user terminals 30A and 30B obtain PMI / CQI / RI. Is extremely difficult.
  • the incoming radio wave from the base station 10 and the incoming radio wave from the RRH 20A are observed superimposed on the user terminal 30A.
  • the incoming radio wave from the base station 10 and the incoming radio wave from the RRH 20B are observed superimposed on the user terminal 30B.
  • the incoming radio wave from the base station 10 is assumed. Therefore, it should be avoided to use a transmission line using CRS that is uniformly transmitted to macro cells and small cells.
  • CSI-RS is sent for 6 antennas (base station 10 has 4 antennas, but there are actually 2 antennas due to correlation.
  • RRH20A and 20B are 2 antennas for 2 each) Although it is possible to measure the transmission path of each antenna, it is not known which is the antenna from the base station 10 and which is the RRH20 antenna.
  • the antenna group (AG) (service area or restricted antenna set) is notified to the user terminals 30A and 30B.
  • the AG notified to the user terminals 30A and 30B is determined by the control unit 12 (antenna configuration condition determining means) of the base station 10. Further, the control unit 12 (antenna configuration condition determining means) of the base station 10 may assign an independent identification number to each AG. In this case, if the AG is a group of physical antennas, it becomes possible to identify which point or cell (100 or 200A or 200B) in the macro cell 100 is a serving point by the AG identification number. Therefore, AG management in the base station 10 is simplified.
  • the notification to the user terminals 30A and 30B may be performed by the base station 10 (that is, the macro radio unit 13 is a communication means), or may be performed by the RRHs 20A and 20B (that is, the RRH radio unit 23 is Communication means), both the base station 10 and the RRHs 20A and 20B may perform the same.
  • 1 is set to a bit corresponding to an antenna number included in the AG
  • 0 is set to a bit corresponding to an antenna number not included in the AG.
  • the antenna numbers included in each AG may overlap or may be complementary (this bitmap may be used as a codebook mask when the UE calculates CQI / PMI / RI).
  • 1 is set for the bits corresponding to the two antenna numbers, and 0 is set for the other bits. What is required is to specify which antenna the user terminals 30A and 30B should use to obtain the PMI / CQI / RI.
  • the CSI-RS port refers to a logical antenna port defined by 3GPP.
  • the present embodiment introduces the concept of a logical antenna port, that is, a CSI-RS port.
  • the antenna number used in the above description is a number for identifying a physical antenna or for identifying a CSI-RS port number.
  • the user terminals 30A and 30B request PMI, CQI, and RI for each of the notified one or more AGs.
  • the user terminals 30A and 30B may feed back all the results obtained for each AG, or may feed back one result that seems to be the best among the AGs.
  • the user terminals 30A and 30B need only obtain PMI / CQI / RI for the designated AG in the AG list.
  • the AG for obtaining PMI / CQI / RI is determined by the control unit 12 (antenna configuration condition determining means) of the base station 10, and various determination methods are conceivable. As the simplest example, there is a method of determining based on a measured value of received power at each uplink AG transmitted by the user terminals 30A and 30B.
  • the user terminals 30A and 30B since the AG is notified to the user terminals 30A and 30B, the user terminals 30A and 30B use the AG corresponding to the service area to be used as the system, using the transmission path associated information (PMI). / CQI / RI) can be obtained.
  • PMI transmission path associated information
  • the small cells 200A and 200B can simultaneously perform MIMO multiplex transmission using the same resource. At this time, the use of the same resource is restricted in the macro cell, but MIMO multiplex transmission is substantially possible at two locations. Therefore, the throughput of the entire system can be improved.
  • a transmission form using a plurality of AGs is not excluded. That is, for example, in FIG. 3, two small cells 200A and 200B are adjacent to each other, and a form in which transmission from two RRHs 20A and 20B is expected is not excluded.
  • the first handling method is a method that assumes an AG composed of 2 CSI-RS ports and handles two or more AGs by receiving CSI.
  • the second handling method is a method of handling by defining one AG composed of 4 CSI-RS ports and receiving CSI for that AG.
  • the macro cell 100 is excluded, and it is important to select a combination of transmitting antennas as disclosed in the present invention.
  • the present invention in order to help understanding, an example in which eight physical antennas are used as upper limits has been shown. However, the present invention should also assume a system in which there are antennas exceeding the number of CSI-RS ports. In this case, for example, in FIG. 3, the same CSI-RS port is allocated between the small cells 200A and 200B that are known not to physically reach radio waves (for some reason, the number of CSI-RS ports If you do not want to increase the number, it is possible to allocate the same CSI-RS port to a small cell away from the beginning).
  • the AG CSI-RS port of (0, 1) is assigned to the macro cell 100
  • the AG CSI-RS ports of (2, 3) and (4, 5) are assigned to the small cells 200A and 200B.
  • allocating (0, 1) to the macro cell 100 and (2, 3) to the respective small cells 200A and 200B is not excluded.
  • the AG of (2, 3) may not necessarily match the physical small cell.
  • Typical broadcast information includes MIB (Master Information Block) and SIB (System Information Block).
  • this RRC Connection Setup also includes a message defining CSI-RS called “CSI-RS-Config-r10” (this message itself is included in the message called “PhysicalConfigDedicated”) Present).
  • Non-patent Document 5 MAC Control Element in MAC (Media Access Control)
  • the packet data sent to the user terminals 30A and 30B is composed of several information elements.
  • the MAC Control Element in the figure can be used for purposes other than packet control. In the LTE-Advanced system specifications, it is also used for the purpose of timing adjustment and instructing the validity / invalidity of the wireless carrier frequency.
  • a plurality of DCI Formats are defined according to their use (Non-Patent Document 6).
  • the main point of the present invention is that the list of AGs, or the list of AGs and the AGs used for the PMI / CQI / RI measurement are individually notified for each user. It is not limited to.
  • (2) Second Embodiment Although the basic configuration of this embodiment is the same as that of the first embodiment, the point that the notification of AG to the user terminals 30A and 30B is not required is the same as the first embodiment. Is different.
  • the correspondence between the antenna number and the AG is stored in the storage unit 33 of the user terminals 30A and 30B as predetermined by the system.
  • the frequency / time position where the CSI-RS is inserted is determined one-to-one with the antenna number.
  • the user terminals 30A and 30B are preliminarily provided with two AGs in order from the youngest, or by using a fixed offset such as (0,4), (1,5), etc. Allocation is performed, and the allocated AG is stored in the storage unit 33.
  • control unit 32 obtains transmission path associated information (PMI / CQI / RI) for each AG allocated to the user terminal 30 of the control unit 32 and stored in the storage unit 33.
  • the terminal radio unit 33 feeds back transmission path associated information (PMI / CQI / RI) for each AG to the system side.
  • the user terminals 30A and 30B obtain the transmission path associated information (PMI / CQI / RI) using the AG corresponding to the service area to be used as the system. The effect that it can be obtained.
  • PMI / CQI / RI transmission path associated information
  • a method in which a problem can be solved while making use of an existing Codebook subset restriction by applying a new process to the existing Codebook subset restriction.
  • the basic configuration of this embodiment is the same as that of the first embodiment.
  • Non-Patent Document 1 The current Codebook is defined by Non-Patent Document 1 as follows.
  • the CSI-RS port mask pattern is introduced in the user terminals 30A and 30B.
  • the CSI-RS port mask pattern is, for example, when the second and third CSI-RS ports are enabled.
  • the control unit 32 of the user terminals 30A and 30B applies this mask pattern and obtains a new Codebook W ′ as follows.
  • control unit 32 of the user terminals 30A and 30B can obtain the CSI only for the desired CSI-RS element.
  • the user terminals 30A and 30B obtain the transmission path associated information (PMI / CQI / RI) using the AG corresponding to the service area to be used as the system. The effect that it can be obtained.
  • the CSI-RS port mask pattern may be derived from the AG described above by the user terminals 30A and 30B, or may be notified from the base station 10 to the user terminals 30A and 30B.
  • antenna group For example, in this specification, combinations of transmission antennas in each service area have been indicated by the expression antenna group (AG).
  • AG antenna group
  • the expression “antenna group” represents the same event, although several expression forms are assumed as follows.
  • a transmission point set transmission point set
  • a transmission / reception point set transmission and reception point set
  • an antenna set Antenna set
  • transmission point mask information transmission point mask information
  • transmission / reception point mask information which are combinations of transmission points (Transmission and reception point mask information).
  • the base station 10 and the RRHs 20A and 20B are connected by the optical fibers 40A and 40B.
  • the base station 10 and the RRHs 20A and 20B may be connected by a high-speed line, and are not limited to optical fibers. .

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

Abstract

La présente invention, qui comprend N zones de desserte (N étant un entier naturel supérieur à 2) auxquelles le même numéro d'identification de cellule est attribué, un dispositif sans fil comprenant en outre une antenne d'émission, au moins un tel dispositif étant compris dans les N zones de desserte respectives, et un terminal qui communique avec le dispositif sans fil dans les zones de desserte, est appliquée à un système de communication sans fil dans lequel les N zones de desserte se chevauchent entièrement ou partiellement. Au moins l'un des dispositifs sans fil comprend en outre un moyen de notification pour notifier au terminal une combinaison des antennes d'émission. Le terminal comprend en outre un moyen de rétroaction pour envoyer en rétroaction des informations auxiliaires de chemin de transmission qui sont obtenues à l'aide de la combinaison d'antennes d'émission concernant laquelle une notification est fournie par le moyen de notification.
PCT/JP2012/064560 2011-07-15 2012-06-06 Système de communication sans fil, dispositif sans fil, terminal et procédé de communication sans fil Ceased WO2013011763A1 (fr)

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JP2011-156810 2011-07-15
JP2011156810 2011-07-15

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06197059A (ja) * 1992-12-24 1994-07-15 Kokusai Electric Co Ltd ダイバーシチ通信方式
WO2009044704A1 (fr) * 2007-10-01 2009-04-09 Ntt Docomo, Inc. Dispositif de station de base, procédé d'émission, dispositif de station mobile et procédé de réception

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06197059A (ja) * 1992-12-24 1994-07-15 Kokusai Electric Co Ltd ダイバーシチ通信方式
WO2009044704A1 (fr) * 2007-10-01 2009-04-09 Ntt Docomo, Inc. Dispositif de station de base, procédé d'émission, dispositif de station mobile et procédé de réception

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
3GPP TR 36.819 VL.0.0, 3GPP, May 2011 (2011-05-01), pages 47 - 55 *
NEW POSTCOM: "Downlink CSI-RS signaling design for LTE-Advanced", 3GPP R1-104421, 27 August 2010 (2010-08-27) *
QUALCOMM INCORPORATED: "Signaling requirements for transparent MU-MIMO operation", 3GPP R1-103546, 2 July 2010 (2010-07-02) *
QUALCOMM INCORPORATED: "Signaling requirements for transparent MU-MIMO operation", 3GPP R1-105571, 15 October 2010 (2010-10-15) *

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