WO2015147524A1 - Terminal, station de base et son procédé de fonctionnement dans un système d'antenne distribué - Google Patents

Terminal, station de base et son procédé de fonctionnement dans un système d'antenne distribué Download PDF

Info

Publication number
WO2015147524A1
WO2015147524A1 PCT/KR2015/002882 KR2015002882W WO2015147524A1 WO 2015147524 A1 WO2015147524 A1 WO 2015147524A1 KR 2015002882 W KR2015002882 W KR 2015002882W WO 2015147524 A1 WO2015147524 A1 WO 2015147524A1
Authority
WO
WIPO (PCT)
Prior art keywords
value
base station
terminal
transmission point
reference signal
Prior art date
Application number
PCT/KR2015/002882
Other languages
English (en)
Korean (ko)
Inventor
남준영
고영조
Original Assignee
한국전자통신연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한국전자통신연구원 filed Critical 한국전자통신연구원
Priority to US15/128,695 priority Critical patent/US20170111090A1/en
Priority claimed from KR1020150040572A external-priority patent/KR20150111310A/ko
Publication of WO2015147524A1 publication Critical patent/WO2015147524A1/fr

Links

Images

Classifications

    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • 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

Definitions

  • a terminal a base station, and a method of operating the same in a distributed antenna system.
  • 4G mobile communication systems require 1000 times more frequency efficiency, 1000 times more energy efficiency, and 1000 times more device acceptance than 4G systems such as 3GPP LTE due to the rapid increase in data traffic.
  • Physical layer technologies for increasing frequency efficiency include network MIMO, interference alignment, relay networks, heterogeneous networks, large-scale antennas, and distributed antenna systems.
  • the distributed antenna system separates the functions of the base station from the radio unit (RU) and the digital unit (DU), and divides the radio signal processor (ie, the antenna part or the transmission point) into a plurality and distributes them.
  • the radio signal processor ie, the antenna part or the transmission point
  • MIMO Multi Input Multi Ouput
  • An object of the present invention is to provide a terminal, a base station, and an operation method of reducing feedback for channel state information in a distributed antenna system.
  • a method of operating a terminal communicating with a base station including first and second transmission points located at different locations may include receiving a reference signal for measuring a channel state from the base station, calculating a first value which is a ratio of a signal and a noise transmitted to the terminal using the reference signal, the reference signal Calculating a second value that is a ratio of interference and noise from the first transmission point, and calculating a third value that is a ratio of interference and noise from the second transmission point using the reference signal And feeding back information on the first to third values to the base station.
  • the base station may calculate channel state information for multiple transmission point MIMO using the first to third values.
  • the base station may perform scheduling for the multi-transmission point MIMO using the calculated channel state information.
  • the multi-transmission point MIMO may be a method in which data is transmitted to the terminal and other terminals other than the terminal with the same resource through the first and second transmission points.
  • the operating method of the terminal may include allocating the second value to a fourth value when the value obtained by dividing the second value by the first value is equal to or greater than a predetermined threshold, and assigning the third value to the fourth value. If the value divided by one value is smaller than the predetermined threshold, the method may further include allocating the third value to a fifth value, wherein the information on the second value corresponds to the fourth value. Information on the third value may correspond to the fifth value.
  • the fourth value and the fifth value may be one bit information.
  • the base station may be a small base station and the small base station may be wirelessly connected to the macro base station, and the small base station may be connected to a backhaul through the wireless and the macro base station.
  • the first transmission point and the second transmission point may be located in different buildings.
  • a method of operating a base station including first and second wireless signal processing units distributed to each other and a digital processing unit connected to the first and second wireless signal processing units.
  • the operating method of the base station may include transmitting a reference signal for measuring a channel state to a terminal, and receiving a first value, which is a ratio of a signal and a noise transmitted to the terminal, calculated using the reference signal, from the terminal. Receiving a second value from the terminal, the second value being a ratio of interference and noise by the first radio signal processor, calculated using the reference signal, and the second radio signal processor calculated using the reference signal. And receiving a third value, which is a ratio of interference and noise, from the terminal.
  • the operation method of the base station may further include calculating channel state information for multiple transmission point MIMO using the first to third values.
  • the operation method of the base station may further include performing scheduling for the multiple transmission point MIMO using the calculated channel state information.
  • the multi-transmission point MIMO may be a method in which the base station transmits data with the same resource to the terminal and other terminals other than the terminal through the first and second radio signal processing units.
  • the base station may be a small base station and the small base station may be wirelessly connected to the macro base station, and the small base station may be connected to a backhaul through the wireless and the macro base station.
  • a terminal for communicating with a base station including first and second transmission points that are distributed in different locations.
  • the terminal uses the RF module to receive a reference signal for channel state measurement from the base station, and the reference signal, to the first value and the second transmission point which is a ratio of interference and noise by the first transmission point.
  • a processor for calculating a second value that is a ratio of interference and noise.
  • the processor may calculate a third value, which is a ratio of a signal and a noise transmitted to the terminal, using the reference signal.
  • the RF module may feed back information about the first to third values to the base station.
  • the processor allocates the first value to a fourth value and divides the second value by the third value.
  • the second value may be assigned as the fifth value.
  • the RF module may feed back the third value, the fourth value, and the fifth value to the base station.
  • the fourth value and the fifth value may be 1 bit information.
  • the feedback overhead may be reduced by feeding back only a predetermined interference signal strength rather than measuring and reporting channel state information from all transmission points.
  • FIG. 1 is a diagram illustrating a wireless communication system according to an exemplary embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a small base station according to an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an environment in which a plurality of wireless signal processing units of FIG. 2 are concentrated.
  • FIG. 4 is a diagram illustrating interference and a signal in an MT-MIMO environment according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating a method of operating a terminal and a small base station in a distributed antenna system according to an exemplary embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a terminal according to an embodiment of the present invention.
  • a terminal may be a mobile terminal (MT), a mobile station (MS), an advanced mobile station (AMS), a high reliability mobile station (HR-MS). ), A subscriber station (SS), a portable subscriber station (PSS), an access terminal (AT), a user equipment (UE), or the like. It may include all or part of the functionality of AMS, HR-MS, SS, PSS, AT, UE, and the like.
  • a base station may be an advanced base station (ABS), a high reliability base station (HR-BS), a node B (node B), an advanced node B (evolved node B, eNodeB), access point (AP), radio access station (RAS), base transceiver station (BTS), mobile multihop relay (MMR) -BS, relay serving as a base station station, RS), a high reliability relay (HR-RS) serving as a base station, etc., and may also refer to ABS, Node B, eNodeB, AP, RAS, BTS, MMR-BS, RS, HR. It may include all or part of functions such as -RS.
  • FIG. 1 is a diagram illustrating a wireless communication system according to an exemplary embodiment of the present invention.
  • a wireless communication system includes a macro base station 100 and a plurality of small base stations 200.
  • the macro base station 100 is connected to the backhaul (core network) by wire and wirelessly connected to the plurality of small base stations 200.
  • the macro base station 100 provides a wireless backhaul link to the plurality of small base stations 200, and the plurality of small base stations 200 are wirelessly connected to the backhaul through the macro base station 100, respectively.
  • the macro base station 100 may include a large-scale antenna system.
  • the transmit antenna correlation exists in the channel between the macro base station 100 installed in the high building and the small base station 200 installed in the low building.
  • the transmission antenna correlation may be expressed as an angle of departure (AoD) and an angular spread (AS).
  • AoD angle of departure
  • AS angular spread
  • the macro base station 100 may transmit data while reducing energy loss. This is called a tunnel effect.
  • the small base station 200 needs to be implemented as a distributed antenna system (ie, a distributed receiving antenna array).
  • Analog beamforming may vary semi-statically according to terminal distribution in day and night time zones.
  • the small base station 200 is wirelessly connected to the backhaul network (core network) through the macro base station 100, it is possible to reduce the cost of building a dedicated wired network.
  • the small base station 200 has a distributed antenna system (distributed antenna array), which will be described in detail with reference to FIG. 2.
  • FIG. 2 is a diagram illustrating a small base station 200 according to an embodiment of the present invention.
  • the small base station 200 includes a digital processor DU 210 and a plurality of radio signal processors RU 220.
  • the plurality of wireless signal processing units 220 may be separated from each other and disposed in different buildings. As shown in FIG. 2, three wireless signal processing units may be disposed in the building A, three wireless signal processing units may be disposed in the building B, and three wireless signal processing units may be disposed in the building C. On the other hand, the plurality of wireless signal processing unit 220 is connected to each other through a dedicated network. Meanwhile, the plurality of wireless signal processing units 220 may include a plurality of antennas, respectively.
  • the digital processor DU 210 corresponds to the rest of the base station function of the small base station 200 except for the antenna part.
  • the digital processing unit DU 210 may select an optimal wireless signal processing unit according to an access link channel state with the terminal 300 from among the plurality of wireless signal processing units 200. That is, the digital processing unit DU 210 may turn on or off the operation of a specific antenna array (wireless signal processing unit) according to the distribution or channel state of the terminal 300.
  • the optimal transmission point that is, the wireless signal processor
  • the reconfigurable distributed antenna as described above, cooperative MIMO transmission is possible, and the terminal 300 can transmit and receive at a high transmission rate.
  • This cooperative MIMO transmission is similar to MU-MIMO (Multi User-MIMO), which has multiple transmission points and multiple reception points (terminals). However, since the transmission points are located at different locations, hereinafter, Multi Transmitter MIMO (MT-) is used. MIMO). That is, in MT-MIMO, a plurality of radio signal processing units located at different locations transmit data to a plurality of terminals (ie, multi-users) using the same resources. Meanwhile, the digital processing unit DU transmits control information through downlink control information (DCI) so that each terminal recognizes a transmission point assigned to each terminal.
  • DCI downlink control information
  • FIG. 3 is a diagram illustrating an environment in which the plurality of wireless signal processors 220 of FIG. 2 are concentrated.
  • the plurality of wireless signal processing units 220 are located at different locations, and service areas overlap each other. That is, cells serviced by the radio signal processing units 220 overlap each other and are densely packed. In the environment of FIG. 3, the cells are densely overlapped with each other, unlike typical cooperative transmissions in which the cells do not overlap each other. In such an environment in which cells overlap each other and are densely packed, signals transmitted by the plurality of wireless signal processing units 220 act as interference with each other.
  • a method of feeding back channel state information in a dense distributed antenna system environment as shown in FIG. 3 will be described.
  • the transmission point corresponds to one wireless signal processing unit RU 220 in FIGS. 2 and 3, and each of the plurality of transmission points may include a plurality of antennas.
  • the UE directly measures and reports channel state information (CQI) for MU-MIMO. That is, conventionally, the terminal directly calculates CQI (Channel Quality Indication) for MU-MIMO and feeds it back to the small base station. However, in the embodiment of the present invention, the terminal does not directly calculate the CQI for MU-MIMO. In the embodiment of the present invention, the terminal feeds back only predetermined information (for example, MTI described below) so that the small base station 100 can estimate the CQI for the MT-MIMO. When there are a plurality of transmission points, the UE needs to know all transmission powers of the transmission points in order to calculate the CQI for MT-MIMO.
  • CQI Channel Quality Indication
  • the terminal feeds back only predetermined information (for example, MTI) described below. Meanwhile, non-zero power channel state information-reference signal (CSI-RS) and zero power CSI-RS are appropriately allocated among the multiple transmission points.
  • predetermined information for example, MTI
  • FIG. 4 is a diagram illustrating interference and a signal in an MT-MIMO environment according to an embodiment of the present invention.
  • the transmission point Tx0 and the transmission point Tx1 are located at different locations, respectively, and correspond to the wireless signal processing unit 200 of FIG. 2. It is assumed that the transmission point TxO transmits data to the UE and transmits data using the same resources to other terminals (not shown) other than the UE. In addition, it is assumed that the transmission point Tx1 transmits data by using the same resource to another terminal other than the UE. In FIG. 4, it is assumed that two transmission points are provided for convenience. However, even if there are three or more transmission points, the embodiment of the present invention described below may be applied.
  • the CQI for MT-MIMO is called 'MT-CQI' for convenience.
  • MT-CQI corresponds to a Signal Interference Noise Ratio (SINR) of the UE
  • SINR Signal Interference Noise Ratio
  • Equation 1 N denotes the interference signal strength due to the background noise and other cells, and a constant 2 indicates that the power of the small base station 200 is divided by 1/2 and transmitted in two data streams. Subject to change.
  • the superscript indicates the index of the transmission point and the subscript indicates the precoding matrix index (PMI).
  • Equation 1 the denominator represents the noise and interference signal strength experienced by the UE, and the numerator represents the strength of its signal received by the UE. Dividing both the numerator and denominator by N in Equation 1 results in Equation 2 below.
  • INR represents an interference-to-noise ratio, which can be replaced by a multi-transmitter interference indicator (MTI) defined below.
  • MTI multi-transmitter interference indicator
  • SNR a (0) represents a noise ratio of the self signal S a 0 of the UE and corresponds to a CQI used in a general LTE system. Therefore, finally, MT-CQI can be expressed as Equation 3 below.
  • Equation 4 MTIs for efficient feedback may be defined as shown in Equation 4 below.
  • a UE calculates and transmits only information on CQI a (0) and MTI used in a general LTE system.
  • the UE UE calculates S a 0 / N, which is a ratio of the noise N to the signal S a 0 transmitted thereto, and feeds it back to the small base station 200.
  • the UE UE calculates I b (0) / N, which is the interference-to-noise ratio from the transmission point Tx0, and I c (1) / N, which is the interference-to-noise ratio from the transmission point Tx1, respectively.
  • Feedback to 200 According to this embodiment of the present invention, the feedback overhead of the terminal can be reduced.
  • the small base station 200 finally calculates the MT-CQI according to Equation 3 using the CQI a (0) , the MTI b (0) , and the MTI b (1) fed back from the UE.
  • the calculation of the MT-CQI is performed by the digital processor 210 of the small base station 200.
  • the digital processor 210 calculates the MT-CQI using the information CQI a (0) , MTI b (0) , and MTI b (1) fed back from the UE, thereby interfering with multiple transmission cores. The degree can be estimated. Through this, the digital processor 210 may perform scheduling and link adaptation for multiple users.
  • the small base station 200 ie, the digital processing unit DU
  • the MT-CQI can be easily calculated because the transmit power per data stream of the point is known. That is, the small base station 200 knows the transmission power for each transmission point and can flexibly schedule it.
  • the transmission point Tx1 transmits with equal power of 1/3 each using three PMIs c, d, and e.
  • the UE feeds back CQI a (0) MTI b (0) , MTI c (1) , MTI d (1) , and MTI e (1)
  • the small base station 200 transmits a transmission point (Tx1). Since the transmit power per data stream is known, MT-CQI can be calculated as shown in Equation 5 below.
  • the terminal cannot know the power of other transmission points except for its own transmission point (ie, the transmission point of the terminal), it is difficult for the terminal to calculate the MT-CQI. As a result, the terminal could not receive multiple data streams from multiple transmission points.
  • the UE simply feeds back only the CQI and the MTI, and the base station knows the transmission power of each transmission point, so that the MT-CQI can be easily calculated.
  • the MTI information fed back by the UE to the small base station 200 may reduce MIT overhead through the following method.
  • the UE may simplify the MUI into 1-bit information through a ratio of the MTI and the SNR a (0) as shown in Equation 6 below with respect to a specific threshold value x.
  • the terminal UE allocates '1' as the MTI information.
  • the UE allocates '0' as MTI information. That is, the UE does not feed back a fine interference level, but feedbacks the interference beam having a very small interference level and an interference beam that does not. As such, since the MTI feedback information is reduced to 1 bit information, the MTI feedback overhead can be reduced.
  • this 1-bit information has a high probability of MUI of 1 in a channel having a large spatial correlation (or angular spread) and a very small number of '0's in all bits, so that a compression sensing technique is used. In this case, the feedback overhead can be further reduced.
  • FIG. 5 is a diagram illustrating a method of operating a terminal and a small base station in a distributed antenna system according to an exemplary embodiment of the present invention.
  • the small base station 200 transmits a reference signal for measuring the channel state to the terminal (UE, 300) (S410).
  • the reference signal for measuring the channel state may be CSI-RS (Channel State Information-Reference Signal). Since the CSI-RS can be known to those skilled in the art, detailed description thereof will be omitted.
  • the small base station 200 according to the embodiment of the present invention has a plurality of transmission points distributed as shown in FIG. 2, and CSI-RS signals are transmitted through the plurality of transmission points.
  • the UE (UE) 300 calculates CQI a (0) of Equation 3 using the reference signal received from the small base station 200 (S420). As described above, CQI a (0) is a noise ratio, that is, S a 0 / N for the signal S a 0 transmitted from the terminal 300 to itself.
  • the terminal UE 300 calculates an MTI of Equation 4 using the reference signal received from the small base station 200 (S430). That is, the terminal UE 300 calculates an MTI which is an interference-to-noise ratio for each transmission point (radio signal processing unit) of the small base station. In case of two transmission points, the UE UE 300 transmits MTI b (0) (I b (0) / N, which is the interference-to-noise ratio from the transmission point Tx0) and MTI b (0) (transmission ) Calculate I c (1) / N, which is the interference-to-noise ratio from point Tx1.
  • the UE (UE, 300) feeds back the CQI a (0) calculated in step S420 and the MTI calculated in step S430 to the small base station 200 (S440).
  • the small base station 200 calculates the MT-CQI as shown in Equation 3 by using the CQI a (0) and the MTI fed back from the terminal (UE) 300 (S450). That is, since the small base station 200 knows the power allocation information of each transmission point, the small base station 200 may calculate the MT-CQI by applying Equation 3 below.
  • the small base station 200 performs scheduling and link adaptation for a multi-user using the MT-CQI calculated in step S450 (S460).
  • the small base station 200 may select a transmission point to transmit optimal data to multiple users among a plurality of transmission points through MT-CQI, and may select multiple users. Through this, interference mitigation between the transmission point and the terminal is possible.
  • FIG. 6 is a diagram illustrating a terminal according to an embodiment of the present invention.
  • the terminal 300 includes a processor 310, a memory 320, and an RF module 330.
  • the processor 310 may be configured to implement the procedures, methods, and functions described with reference to FIGS. 1 to 4.
  • the memory 320 is connected to the processor 310 and stores various information related to the operation of the processor 310.
  • the RF module 330 is connected to an antenna (not shown) and transmits or receives a radio signal.
  • the antenna may be implemented as a single antenna or multiple antennas (MIMO antenna).
  • the present invention can be used in a mobile communication system.

Abstract

L'invention concerne un terminal, une station de base et son procédé de fonctionnement dans un système d'antenne distribué. Une station de base peut comprendre des premier et second points d'émission situés à différents endroits. La station de base émet un signal de référence pour mesurer un état de canal à destination d'un terminal. Le terminal calcule une première valeur qui est un rapport d'un signal émis à destination du terminal sur le bruit, à l'aide du signal de référence reçu. En outre, le terminal calcule une deuxième valeur qui est un rapport du brouillage par un premier point d'émission sur le bruit et calcule une troisième valeur qui est un rapport du brouillage par un second point d'émission sur le bruit, à l'aide du signal de référence reçu. Le terminal transmet des informations sur les première à troisième valeurs à la station de base.
PCT/KR2015/002882 2014-03-25 2015-03-24 Terminal, station de base et son procédé de fonctionnement dans un système d'antenne distribué WO2015147524A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/128,695 US20170111090A1 (en) 2014-03-25 2015-03-24 Terminal and base station in distributed antenna system and operation method thereof

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
KR20140034879 2014-03-25
KR10-2014-0034879 2014-03-25
KR10-2014-0142858 2014-10-21
KR20140142858 2014-10-21
KR10-2014-0154769 2014-11-07
KR20140154769 2014-11-07
KR1020150040572A KR20150111310A (ko) 2014-03-25 2015-03-24 분산 안테나 시스템에서의 단말, 기지국 및 그 동작 방법
KR10-2015-0040572 2015-03-24

Publications (1)

Publication Number Publication Date
WO2015147524A1 true WO2015147524A1 (fr) 2015-10-01

Family

ID=54195964

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2015/002882 WO2015147524A1 (fr) 2014-03-25 2015-03-24 Terminal, station de base et son procédé de fonctionnement dans un système d'antenne distribué

Country Status (1)

Country Link
WO (1) WO2015147524A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120139469A (ko) * 2011-06-17 2012-12-27 삼성전자주식회사 협력 통신을 위한 피드백 송수신 방법 및 장치
WO2013065422A1 (fr) * 2011-10-31 2013-05-10 Nec Corporation Appareil et procédé pour le calcul et la remise d'informations d'état de canal
KR20130120712A (ko) * 2012-04-26 2013-11-05 삼성전자주식회사 무선 통신 시스템에서 간섭 정렬을 위한 방법 및 장치
KR20130134889A (ko) * 2012-05-31 2013-12-10 삼성전자주식회사 무선 통신 시스템에서 복수의 기지국이 협동하는 방법 및 장치
KR20140009519A (ko) * 2011-04-22 2014-01-22 차이나 아카데미 오브 텔레커뮤니케이션즈 테크놀로지 채널 품질 지시자의 보고 방법, 장치 및 시스템

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140009519A (ko) * 2011-04-22 2014-01-22 차이나 아카데미 오브 텔레커뮤니케이션즈 테크놀로지 채널 품질 지시자의 보고 방법, 장치 및 시스템
KR20120139469A (ko) * 2011-06-17 2012-12-27 삼성전자주식회사 협력 통신을 위한 피드백 송수신 방법 및 장치
WO2013065422A1 (fr) * 2011-10-31 2013-05-10 Nec Corporation Appareil et procédé pour le calcul et la remise d'informations d'état de canal
KR20130120712A (ko) * 2012-04-26 2013-11-05 삼성전자주식회사 무선 통신 시스템에서 간섭 정렬을 위한 방법 및 장치
KR20130134889A (ko) * 2012-05-31 2013-12-10 삼성전자주식회사 무선 통신 시스템에서 복수의 기지국이 협동하는 방법 및 장치

Similar Documents

Publication Publication Date Title
US10645721B2 (en) Channel sounding for frequency division duplex system
WO2011037413A2 (fr) Dispositif et procédé de gestion des interférences dans des cellules voisines comprenant de multiples noeuds d'émission et de réception
EP2923522B1 (fr) Systèmes et procédés pour éviter une interférence, estimer une voie et exécuter une autre signalisation dans une transmission multiutilisateur en duplex total
WO2012096449A2 (fr) Procédé et appareil de transmission coopérative à plusieurs cellules
WO2017026762A1 (fr) Technique de communication au moyen d'un signal de référence d'informations d'état de canal (csi-rs) dans un système de communication mobile
WO2016036174A1 (fr) Procédé et appareil d'estimation de qualité de canal en tenant compte d'une commande d'interférence et d'une communication coordonnée dans un système cellulaire
WO2010123295A2 (fr) Procédé collaboratif de communication dans un système cellulaire de communications sans fil et terminal destiné à mettre en oeuvre le procédé
WO2010120024A1 (fr) Procédé de coordination de matrices de précodage dans un système de communication sans fil
WO2016039586A1 (fr) Procédé de transmission et de réception de signal de référence dans un système de communications sans fil
WO2018230869A1 (fr) Procédé et dispositif de transmission de données dans un système de communication mobile
WO2015133793A1 (fr) Procédé et appareil de mappage d'antennes virtuelles pour un renvoi d'informations de mappage d'antennes virtuelles dans un système entrées multiples sorties multiples (mimo)
WO2009134093A2 (fr) Procédé d’allocation de ressources pour des utilisateurs périphériques à l’aide d’un mimo coopératif
WO2013112008A1 (fr) Procédé et système pour fournir un service dans un système de communication sans fil
WO2014007519A1 (fr) Appareil et procédé permettant d'exploiter des ressources dans un système de communication
WO2017078475A1 (fr) Procédé et dispositif pour émettre un signal de référence dans un système de communication
US20190123991A1 (en) Systems and Methods for a Sounding Frame in an IEEE 802.11AX Compliant Network
WO2017026863A1 (fr) Procédé et appareil d'émission et de réception de signal de référence dans un système de communication
WO2014073780A1 (fr) Système de traitement de signal, appareil de traitement de signal numérique et procédé de gestion de puissance de transmission dans ledit système
WO2010085048A2 (fr) Procédé et appareil pour la synchronisation inter-cellulaire dans un environnement multi-cellulaire
WO2016117875A1 (fr) Dispositif et procédé de transmission d'informations de commande pour transmission coopérative dans un système de communication sans fil
WO2013109053A1 (fr) Procédé et appareil permettant de transmettre des données dans un système de communication sans fil
WO2010101382A2 (fr) Système de communication comprenant une station de base femto et un terminal de communication, et procédé de communication associé
WO2017188769A2 (fr) Procédé et dispositif de configuration et d'émission d'un signal de référence dans un système de communication mobile au moyen de multiples antennes réseau
WO2010058890A2 (fr) Appareil et procédé pour assurer un service de diffusion et système associé
WO2013103202A1 (fr) Procédé et dispositif d'émission-réception pour communication coopérative à base de crs

Legal Events

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

Ref document number: 15769606

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 15128695

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15769606

Country of ref document: EP

Kind code of ref document: A1