WO2011156974A1 - Procédé et appareil de surveillance de qualité de canal de liaison descendante - Google Patents

Procédé et appareil de surveillance de qualité de canal de liaison descendante Download PDF

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Publication number
WO2011156974A1
WO2011156974A1 PCT/CN2010/074090 CN2010074090W WO2011156974A1 WO 2011156974 A1 WO2011156974 A1 WO 2011156974A1 CN 2010074090 W CN2010074090 W CN 2010074090W WO 2011156974 A1 WO2011156974 A1 WO 2011156974A1
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WIPO (PCT)
Prior art keywords
time
frequency resources
antennas
network device
wireless subframe
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PCT/CN2010/074090
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English (en)
Chinese (zh)
Inventor
张晓博
郑方正
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上海贝尔股份有限公司
阿尔卡特朗讯
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Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to PCT/CN2010/074090 priority Critical patent/WO2011156974A1/fr
Priority to CN201080065247.1A priority patent/CN102792725B/zh
Publication of WO2011156974A1 publication Critical patent/WO2011156974A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams

Definitions

  • the present application relates to wireless communication systems, and more particularly to a method and apparatus for downlink channel quality monitoring in a wireless communication system. Background technique
  • the LTE-A (Long Term Evolution system-Advanced) considers two downlink reference signals, a DM RS (Demodulation Reference Signal) and a Channel Status Information Reference Signal (CSI RS).
  • the DM RS is used for PDSCH (Physical Downlink Shared Channel) demodulation.
  • the CSI RS is used for downlink channel quality monitoring (CQI/PMI/RI, Channel Quality Indicator/Precoding Matrix Indicator/Rank Indicator, channel quality indicator/precoding matrix indicator/rank indicator), and is a cell-specific pilot.
  • each RB (Resource Block) pair that is, corresponding to 1 subframe and 12 subcarriers, can set multiple reference signals.
  • only one channel state information reference signal is usually set for every 10 RB pairs, and the average CSI-RS transmitted by each antenna occupies one time-frequency resource particle in one RB pair containing the reference signal (RE, Resource Element ).
  • each RB pair has a total of 12 subcarriers multiplied by 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols (ie, 168) of time-frequency resource particles, some of which have been allocated for transmission of some control. information.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the base station can transmit signals with multiple antennas, such as two antennas, four antennas and eight antennas.
  • the base station may use an antenna instead of Antenna launch.
  • an antenna is used instead of eight antennas.
  • the inventors of the present invention have realized that in this case, if the resources of the CSI-RSs of the plurality of antennas are improperly allocated, the system performance may be adversely affected.
  • the transmit power on the OFDM symbol where the antenna is located may be Not enough, the power boosting requirement cannot be met, and the power of the OFDM symbol in which the other antennas that do not transmit the CSI-RS are originally located is reduced, so that the transmission power of the base station side is not fully utilized.
  • a method of performing downlink channel quality monitoring in a first network device has a first plurality of antennas.
  • the method includes the steps of: transmitting, by the first plurality of antennas, a first plurality of channel state information reference signals, respectively, on the first plurality of time-frequency resources in a first wireless subframe, where the first multiple The time-frequency resources share a time period within the first wireless subframe.
  • the first plurality of time-frequency resources for the CSI-RS share a time period, that is, the first plurality of channel state information reference signals share the time period, for example, one OFDM symbol, even if the base station transmits the CSI-RS from multiple antennas
  • the CSI-RS is transmitted as a single antenna, and the power of each OFDM symbol does not change, thereby maximizing the transmission power of the base station side, thereby improving the performance of the user terminal equipment receiving the CSI-RS.
  • the CSI-RS corresponding to one network device is transmitted within one time period instead of being transmitted in two consecutive time periods, the reception of the user terminal device can be compressed, thereby reducing the user terminal device. Power consumption.
  • a method of monitoring a downlink channel quality corresponding to a first network device in a user terminal device The first network device has a first plurality of antennas. The method includes the following steps:
  • the information reference signal is sent by the first network device on the first plurality of time-frequency resources in a first wireless subframe, respectively, via the first plurality of antennas, and
  • the first plurality of time-frequency resources share a time period in the first wireless subframe.
  • a channel quality indicating apparatus for performing downlink channel quality monitoring in a first network device.
  • the first network device has a first plurality of antennas.
  • the channel quality indicator device includes a transmitter, configured to send, by using the first plurality of antennas, a first plurality of channel state information reference signals on a first plurality of time-frequency resources in a first wireless subframe
  • the first plurality of time-frequency resources share a time period in the first wireless subframe.
  • a channel quality monitoring apparatus for monitoring a downlink channel quality corresponding to a first network device in a user terminal device.
  • the first network device has a first plurality of antennas.
  • the channel quality monitoring device includes:
  • a receiver for receiving a first plurality of channel state information reference signals, the first plurality of channel state information reference signals being the first plurality of devices in the first wireless subframe by the first network device Time-frequency resources, respectively transmitted via the first plurality of antennas, and
  • a processor configured to determine, according to the first plurality of channel state information reference signals, a downlink channel quality corresponding to the first network device,
  • the first plurality of time-frequency resources share a time period in the first wireless subframe.
  • Figure la to Figure If is a schematic diagram of a transmission mode of a CSI-RS corresponding to two antenna cases according to an embodiment of the present invention
  • FIGS. 2a to 2f are diagrams showing transmission modes of CSI-RSs corresponding to four antenna cases, according to an embodiment of the present invention.
  • 3a to 3f are diagrams showing transmission modes of CSI-RSs corresponding to eight antenna cases, according to an embodiment of the present invention.
  • FIG. 4 is a flow chart of a method in accordance with an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a channel quality monitoring apparatus in accordance with one embodiment of the present invention.
  • the same or similar reference numerals in the drawings represent the same or similar components. detailed description
  • the first network device has a first plurality of antennas.
  • Network devices can be implemented in a variety of ways, such as a base station or a relay station.
  • the network device corresponds to one cell, and one cell is identified by a cell ID (Cell ID).
  • Cell ID The number of antennas of the first plurality of antennas may be any value. Taking the LTE-A system as an example, the number of antennas of the first plurality of antennas may be two, four or eight.
  • the downlink channel refers to the channel used by the network device to transmit signals. Downlink channel quality monitoring may also be referred to as downlink channel quality estimation, downlink channel quality detection, or downlink channel quality measurement.
  • the method includes the steps of: transmitting, by the first plurality of antennas, a first plurality of channel state information reference signals, respectively, on the first plurality of time-frequency resources in the first wireless subframe, where the first plurality of time-frequency resource sharing A time period within the first wireless subframe.
  • the wireless subframes may have various lengths, for example, corresponding to the LTE-A system, and one wireless subframe has a length of 1 ms.
  • Each of the first plurality of time-frequency resources can pass
  • each time-frequency resource is one time-frequency resource particle, that is, one time-frequency resource corresponding to one OFDM symbol and one sub-carrier.
  • the first plurality of channel state information reference signals are the first plurality of CSI-RSs.
  • Each of the first plurality of antennas transmits a CSI-RS signal, and the CSI-RS signals of different antennas may be the same or different.
  • the number of antennas of the first plurality of antennas may be the same as or different from the number of time-frequency resources of the first plurality of time-frequency resources.
  • each antenna occupies an average of one time-frequency resource.
  • the first plurality of time-frequency resources share a time period within the first wireless subframe, that is, the first plurality of channel state information reference signals share the time period.
  • the first plurality of time-frequency resources are within one OFDM symbol.
  • the respective CSI-RSs of the first plurality of antennas may be frequency division multiplexed and/or code division multiplexed.
  • the first plurality of time-frequency resources used for the CSI-RS share the same time period (eg, within one OFDM symbol), even if the base station transmits the CSI-RS from the multiple antennas to the single-antenna transmission CSI-RS, each OFDM The power of the symbol does not change, thereby maximizing the transmission power of the base station side, thereby improving the performance of the user terminal equipment receiving the CSI-RS.
  • the CSI-RS corresponding to one network device is transmitted within one time period instead of being transmitted in two consecutive time periods, the reception of the user terminal device can be simplified, thereby reducing the user terminal device. Power consumption.
  • a wireless communication system has a plurality of network devices, and the first plurality of antennas of the first network device transmit CSI-RS and other network devices in the wireless communication system (such as network devices of neighboring cells) send CSI- There are many relationships between the ways of RS.
  • the second plurality of time-frequency resources in the first wireless subframe are used to send the second plurality of channel state information reference signals, respectively, via the second plurality of antennas of the second network device, the second plurality The time-frequency resource shares a time period within the first wireless subframe with the first plurality of time-frequency resources.
  • Each of the second plurality of antennas transmits a CSI-RS signal, and the CSI-RS signals of different antennas may be the same or different.
  • the number of antennas of the second plurality of antennas may be the same as or different from the number of time-frequency resources of the second plurality of time-frequency resources. Sharing, by the first plurality of time-frequency resources and the second plurality of time-frequency resources, a time period in the first wireless subframe, that is, the first plurality of channel state information reference signals and the second plurality of channel state information reference signals share a time segment.
  • the first plurality of time-frequency resources and the second plurality of time-frequency resources are all within one 0 FDM symbol.
  • the CSI-RSs corresponding to multiple network devices in a communication system are concentrated in one OFDM symbol, so that it is easier to find an OFDM symbol that is not used by the downlink reference signal of another communication system for CSI-
  • the RS transmission avoids collision with the downlink reference signals of other communication systems, which facilitates smooth evolution of the communication system, for example, avoids interference to the fifth antenna port in the R8 system.
  • a third plurality of time-frequency resources in a second wireless subframe are used to respectively transmit a third plurality of channel state information reference signals via a third plurality of antennas of a third network device, and third The number of antennas of the plurality of antennas is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include frequency resources occupied by the first plurality of time-frequency resources, and the third plurality of time-frequency resources and The temporal positional relationship between the second wireless subframes and the temporal positional relationship between the first plurality of time-frequency resources and the first wireless subframe are the same.
  • Each of the third plurality of antennas transmits a CSI-RS signal, and the CSI-RS signals of different antennas may be the same or different.
  • the number of antennas of the third plurality of antennas may be the same as or different from the number of time-frequency resources of the third plurality of time-frequency resources.
  • the temporal positional relationship between the time-frequency resource and the wireless subframe can be represented in various ways.
  • a radio subframe includes 14 OFDM symbols
  • the time position relationship between the time-frequency resource and the radio subframe can be represented by the label of the OFDM symbol occupied by the time-frequency resource.
  • the label of the OFDM symbol of the first plurality of time-frequency resources in the first wireless subframe and the third plurality of time-frequency resources are The labels of the OFDM symbols in the second radio subframe are the same.
  • the average number of time-frequency resources corresponding to each antenna is fixed.
  • the time-frequency resources corresponding to the third network device The number is greater than the time corresponding to the first network device The number of frequency resources.
  • the frequency resource occupied by the third plurality of time-frequency resources includes a frequency resource occupied by the first plurality of time-frequency resources, and a time-position relationship between the third plurality of time-frequency resources and the second wireless subframe and the first
  • the time position relationship between the multiple time-frequency resources and the first wireless subframe is the same. Therefore, for a network device with different antenna numbers, from the perspective of resource allocation mode, when the number of antennas is different, the CSI-RS is occupied.
  • the time-frequency resources have overlapping parts, that is, nested structures. This nested structure facilitates the system to configure the transmission mode of the CSI-RS.
  • a fourth plurality of time-frequency resources in a third wireless subframe are used to respectively transmit a fourth plurality of channel state information reference signals via a fourth plurality of antennas of a fourth network device, and fourth The number of the plurality of antennas is equal to the number of the first plurality of antennas, the temporal positional relationship between the fourth plurality of time-frequency resources and the third wireless subframe, and the first plurality of time-frequency resources and the first wireless subframe The time position relationship is the same, and the frequency resources occupied by the fourth plurality of time-frequency resources are the same as the frequency resources occupied by the first plurality of time-frequency resources.
  • Each of the fourth plurality of antennas transmits a CSI-RS signal, different antennas
  • the CSI-RS signals can be the same or different.
  • the number of antennas of the fourth plurality of antennas may be the same as or different from the number of time-frequency resources of the fourth plurality of time-frequency resources.
  • the fourth plurality of time-frequency resources are the same as the time position relationship between the fourth plurality of time-frequency resources and the third wireless subframe and the time position relationship between the first plurality of time-frequency resources and the first wireless subframe.
  • the occupied frequency resource is the same as the frequency resource occupied by the first plurality of time-frequency resources.
  • Figure la to Figure If is a schematic diagram of a transmission mode of a CSI-RS corresponding to two antenna cases, according to an embodiment of the present invention.
  • Figures la to lc show the case of a normal cyclic prefix (normal cyclic prefix).
  • the base station of each cell has two antennas.
  • the resource particles shaded in Figure la are resource particles that have been occupied by R8 and resource particles that have been allocated in R10. Resource particles that are not shaded are empty resource particles.
  • Figure lb shows some extra resource particles relative to Figure la because of the fact that the antenna port 5 is not used in R8.
  • Figure lc has some extra resource particles relative to Figure la because of the fact that antenna ports 2 and 3 are not used in R8. It can be seen that the resource particles within the OFDM symbol 10 are free, in any case.
  • the two antennas of each cell share two resource particles in the OFDM symbol 10 by means of code division multiplexing, and each antenna occupies one resource particle on average.
  • the base station of each cell has two antennas.
  • the resource particles shaded in Figure Id are resource particles that have been occupied by R8 and resource particles that have been allocated in R10. Resource particles that are not shaded are idle resource particles.
  • Figure le has some extra resource particles relative to Figure Id because of the fact that antenna port 5 is not used in R8.
  • the two antennas of each cell share the two resource particles in the OFDM symbol 8 by means of code division multiplexing, and each antenna occupies one resource particle on average.
  • FIGS. 2a through 2f are diagrams showing transmission modes of CSI-RSs corresponding to four antenna cases, according to an embodiment of the present invention.
  • Figures 2a to 2c show the transmission resources of CSI-RS allocated for three cells in the case of a normal cyclic prefix.
  • Figure 2a considers the use of antenna ports 2, 3 and 5 in R8.
  • Figure 2b considers the case where antenna port 5 is not used in R8.
  • Figure 2c considers the case where antenna ports 2 and 3 are not used in R8.
  • the base station of each cell has four antennas. Each of the two antennas of each cell shares the two resource particles in the OFDM symbol 10 by means of code division multiplexing, and each antenna occupies one resource particle on average.
  • Figure 2d to Figure 2f show the extended cyclic prefix
  • Figure 2d considers the use of antenna ports 2, 3 and 5 in R8.
  • Figure 2e considers the case where the antenna port 5 is not used in R8.
  • Figure 2f considers the case where antenna ports 2, 3 and 5 are not used in R8.
  • the base station of each cell has four antennas.
  • the base station of each cell has four antennas.
  • Each of the two antennas of each cell shares two resource particles in the OFDM symbol 8 by means of code division multiplexing, and each antenna occupies one resource particle on average.
  • 3a through 3f are diagrams showing transmission modes of CSI-RSs corresponding to eight antenna cases, according to an embodiment of the present invention.
  • Figures 3a to 3c show the transmission resources of CSI-RS allocated for one cell in the case of a normal cyclic prefix.
  • Figure 3a considers the use of antenna ports 2, 3 and 5 in R8.
  • Figure 3b considers the case where antenna port 5 is not used in R8.
  • Figure 3c considers the case where antenna ports 2 and 3 are not used in R8.
  • the base station of the cell has eight antennas. Each of the two antennas shares the two resource particles within the OFDM symbol 10 in a code division multiplexing manner, averaging one resource particle per antenna.
  • Figures 3d to 3f show the transmission resources of CSI-RS allocated for one cell in the case of extended cyclic prefix.
  • Figure 3d considers the use of antenna ports 2, 3 and 5 in R8.
  • Figure 3e considers the case where the antenna port 5 is not used in the R8.
  • Figure 3f considers the case where antenna ports 2, 3, and 5 are not used in R8.
  • the base station of the cell has eight antennas. Each of the two antennas shares the two resource particles in the OFDM symbol 8 by means of code division multiplexing, and each antenna occupies one resource particle on average.
  • the base station of the neighboring cell can use the next radio subframe to transmit CSI-RS signals, that is, time division multiplexing.
  • the base stations of different cells use the same CSI-RS transmission mode.
  • the base stations of three adjacent cells can use the next wireless subframe to transmit CSI-RS signals. That is, the time base multiplexing is used to make the base stations of different cells use the same CSI-RS transmission mode.
  • FIG. 4 is a flow chart of a method in accordance with one embodiment of the present invention.
  • a method of monitoring a downlink channel quality corresponding to a first network device in a user terminal device can be implemented in a variety of ways, such as a mobile phone or a laptop computer.
  • the first network device has a first plurality of antennas.
  • the method includes step 410, the user terminal device receives a first plurality of channel state information reference signals, where the first plurality of channel state information reference signals are used by the first network device in a first wireless subframe.
  • the first plurality of time-frequency resources are respectively sent via the first plurality of antennas.
  • the method further includes a step 420, the user terminal device monitors, according to the first plurality of channel state information reference signals, a downlink channel quality corresponding to the first network device, where the first plurality of time-frequency resources share the first wireless subframe. A time period.
  • the second plurality of time-frequency resources in the first wireless subframe are used to respectively send the second plurality of channel state information reference signals via the second plurality of antennas of the second network device,
  • the plurality of time-frequency resources share a time period in the first wireless subframe with the first plurality of time-frequency resources, that is, a time period shared by the first plurality of time-frequency resources.
  • a third plurality of time-frequency resources in a second wireless subframe are used to respectively transmit a third plurality of channel state information reference signals via a third plurality of antennas of a third network device
  • the number of antennas of the third plurality of antennas is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include frequency resources occupied by the first plurality of time-frequency resources, and the third plurality of times
  • the temporal positional relationship between the frequency resource and the second wireless subframe and the temporal positional relationship between the first plurality of time-frequency resources and the first wireless subframe are the same.
  • a fourth plurality of time-frequency resources in a third wireless subframe are used to respectively transmit a fourth plurality of channel state information reference signals via a fourth plurality of antennas of a fourth network device
  • the number of the fourth plurality of antennas is equal to the number of the first plurality of antennas
  • the time position relationship between the fourth plurality of time-frequency resources and the third wireless subframe is first
  • the time position relationship between the plurality of time-frequency resources and the first wireless subframe is the same, and the frequency resources occupied by the fourth plurality of time-frequency resources are the same as the frequency resources occupied by the first plurality of time-frequency resources.
  • a channel quality indicating apparatus for performing downlink channel quality monitoring in a first network device.
  • the first network device has a first plurality of antennas.
  • the channel quality indicator device includes a transmitter, configured to send, by using the first plurality of antennas, a first plurality of channel state information reference signals, respectively, on the first plurality of time-frequency resources in a first wireless subframe, where The first plurality of time-frequency resources share a time period within the first wireless subframe.
  • the second plurality of time-frequency resources in the first wireless subframe are used to respectively send the second plurality of channel state information reference signals via the second plurality of antennas of the second network device
  • the second plurality of time-frequency resources share a time period in the first wireless subframe with the first plurality of time-frequency resources, that is, a time period shared by the first plurality of time-frequency resources.
  • a third plurality of time-frequency resources in a second wireless subframe are used to transmit a third plurality of channel state information via a third plurality of antennas of a third network device, respectively.
  • a reference signal the number of antennas of the third plurality of antennas is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include frequency resources occupied by the first plurality of time-frequency resources, and the third The temporal positional relationship between the time-frequency resources and the second wireless subframe and the temporal positional relationship between the first plurality of time-frequency resources and the first wireless subframe are the same.
  • the fourth plurality of time-frequency resources in a third wireless subframe are used to transmit the fourth plurality of channel state information via the fourth plurality of antennas of the fourth network device, respectively.
  • a reference signal the number of the fourth plurality of antennas is equal to the number of the first plurality of antennas, the time position relationship between the fourth plurality of time-frequency resources and the third wireless subframe, and the first plurality of time-frequency resources and the first wireless
  • the time position relationship between the subframes is the same, and the frequency resources occupied by the fourth plurality of time-frequency resources are the same as the frequency resources occupied by the first plurality of time-frequency resources.
  • Figure 5 is a schematic diagram of a channel quality monitoring apparatus in accordance with one embodiment of the present invention. According to an embodiment of the fourth aspect of the present invention, there is provided a channel quality monitoring apparatus for monitoring a downlink channel quality corresponding to a first network device in a user terminal device.
  • the first network device has a first plurality of antennas.
  • the channel quality monitoring device 500 includes a receiver 510 and a processor 520.
  • the receiver 510 is configured to receive a first plurality of channel state information reference signals, where the first plurality of channel state information reference signals are used by the first network device, on the first plurality of time-frequency resources in a first wireless subframe. , transmitted via the first plurality of antennas, respectively.
  • the processor 520 is configured to determine, according to the first plurality of channel state information reference signals, a downlink channel quality corresponding to the first network device.
  • the first plurality of time-frequency resources share a time period within the first wireless subframe.
  • the second plurality of time-frequency resources in the first wireless subframe are used to respectively send the second plurality of channel state information reference signals via the second plurality of antennas of one second network device
  • the second plurality of time-frequency resources share a time period in the first wireless subframe with the first plurality of time-frequency resources, that is, a time period shared by the first plurality of time-frequency resources.
  • a third plurality of time-frequency resources in a second wireless subframe are used to respectively transmit a third plurality of channel state information via a third plurality of antennas of a third network device a reference signal, the number of antennas of the third plurality of antennas is greater than the number of antennas of the first plurality of antennas, and the frequency resources occupied by the third plurality of time-frequency resources include frequency resources occupied by the first plurality of time-frequency resources, and the third The temporal positional relationship between the time-frequency resources and the second wireless subframe and the temporal positional relationship between the first plurality of time-frequency resources and the first wireless subframe are the same.
  • a fourth plurality of time-frequency resources in a third wireless subframe are used to respectively transmit a fourth plurality of channel state information via a fourth plurality of antennas of a fourth network device a reference signal, the number of the fourth plurality of antennas is equal to the number of the first plurality of antennas, the time position relationship between the fourth plurality of time-frequency resources and the third wireless subframe, and the first plurality of time-frequency resources and the first wireless
  • the temporal positional relationship between sub-frames is the same,
  • the frequency resources occupied by the fourth plurality of time-frequency resources are the same as the frequency resources occupied by the first plurality of time-frequency resources.

Abstract

La présente invention concerne un procédé et un appareil de surveillance de qualité de canal de liaison descendante. Un premier dispositif de réseau a une première pluralité d'antennes. Le procédé consiste en ce que : sur une première pluralité de ressources temps-fréquence dans une première sous-trame radio, le premier dispositif de réseau envoie une première pluralité de signaux de référence d'informations d'état de canal (CSI RS) par l'intermédiaire de la première pluralité d'antennes, respectivement, la première pluralité de ressources temps-fréquence partageant une période de temps dans la première sous-trame radio. Parce que la pluralité de ressources temps-fréquence pour transmettre les CSI RS partagent la période de temps, c'est-à-dire que la pluralité de CSI RS partagent la période de temps, par exemple un symbole de multiplexage par répartition en fréquence orthogonale (OFDM), la puissance de chaque symbole OFDM ne changera pas même si une station de base passe de l'envoi des CSI RS par l'intermédiaire d'une pluralité d'antennes à l'envoi des CSI RS par l'intermédiaire d'une seule antenne ; ainsi, la puissance de transmission du côté station de base est augmentée à un maximum ; et en outre la performance de réception des CSI RS par un dispositif terminal d'utilisateur est améliorée.
PCT/CN2010/074090 2010-06-18 2010-06-18 Procédé et appareil de surveillance de qualité de canal de liaison descendante WO2011156974A1 (fr)

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CN108989008B (zh) * 2017-06-05 2021-12-14 华为技术有限公司 参考信号的传输方法、装置和设备

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