CN107370584B - Pilot frequency information sending method and device and pilot frequency information receiving method and device - Google Patents
Pilot frequency information sending method and device and pilot frequency information receiving method and device Download PDFInfo
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- CN107370584B CN107370584B CN201610319112.2A CN201610319112A CN107370584B CN 107370584 B CN107370584 B CN 107370584B CN 201610319112 A CN201610319112 A CN 201610319112A CN 107370584 B CN107370584 B CN 107370584B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
Abstract
The invention discloses a method for sending pilot frequency information, which is applied to a sending end and comprises the following steps: configuring a first type channel measurement reference pilot signal for a receiving end; determining a second type of channel measurement reference pilot signal generating interference on the first type of channel measurement reference pilot signal; sending parameter information of the second-type channel measurement reference pilot signal to the receiving end; the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all of ports in the first type of channel measurement reference pilot signal. The invention can improve the utilization rate of the pilot frequency resource.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for transmitting pilot information, and a method and an apparatus for receiving pilot information.
Background
In a wireless communication system, a transmitting end often adopts a plurality of antennas to obtain a higher transmission rate. The multiple antennas can improve the signal-to-noise ratio and support more spatial multiplexing layers, and compared with an open-loop multiple-input multiple-output (MIMO) technology in which a sending end does not use CSI (channel State information) information, an MIMO technology (closed-loop MIMO Precoding) technology using CSI information has higher capacity, and is a transmission technology widely used in the currently mainstream 4G (fourth generation mobile communication technology) standard. The core idea of the closed-loop MIMO precoding technology is that a receiving end feeds back channel information to a sending end, and the sending end uses some transmitting precoding technologies according to the obtained channel information, so that the transmission performance can be greatly improved. For single-user MIMO, a precoding vector which is matched with the channel characteristic vector information in a comparison mode can be directly used for sending precoding; for multi-user MIMO, relatively accurate channel information is also required for interference cancellation. Therefore, the acquisition of channel information plays a very important role. In some standard specifications of 4G technologies, a general procedure for acquiring downlink channel information of an FDD (Frequency Division duplex) system is as follows:
a transmitting end (base station) transmits a downlink Channel measurement-Reference signal (CSI-RS) to a receiving end, and generally, each antenna transmits a Channel measurement pilot signal. The positions of channel measurement pilot signals sent by different antennas on a time-frequency domain or a code domain are staggered, orthogonality can be kept without mutual interference, and each antenna corresponds to one CSI-RS port (port). And in LTE-A (Long Term Evolution-Advanced, subsequent Evolution of Long Term Evolution technology), CSI-RS (channel state information-reference signal) transmission of a maximum 8-antenna port at a base station side is supported. The base station also sends RRC (Radio Resource Control) signaling configuration CSI-RS (channel state information-reference signal) related position information and sending period information to the terminal. The sending content of the pilot signal at the base station side is determined by some rules agreed in advance, and the terminal can accurately acquire the sending content of the pilot signal of each port at each time-frequency position at the base station side.
The terminal receives configuration information of a channel information measurement pilot frequency CSI-RS sent by a base station side, CSI-RS pilot frequency signal receiving and detection are carried out at time frequency resource positions sent by each pilot frequency port informed by signaling, the received CSI-RS pilot frequency signals are obtained on each receiving antenna of the terminal side, and due to the fact that the terminal and the base station carry out agreement of pilot frequency sending signal contents at the time frequency resource positions of each sending port, the terminal can accurately obtain downlink pilot frequency sending signals, and then the terminal can carry out downlink channel estimation according to the received pilot frequency signals to obtain downlink channel response information between the receiving antenna of the terminal side and the sending antenna port of the base station side. In downlink channel estimation, the influence of noise and interference doping in actual pilot signal reception needs to be considered, and channel estimation can be performed by using algorithms such as LS, MMSE (Minimum Mean Square Error), IRC and the like, so as to finally obtain a downlink channel matrix matched with the number of transmission ports at each time-frequency resource position.
The terminal can estimate channel responses between the receiving antenna and the plurality of transmitting antenna ports according to the transmitting pilot signal content of each pilot port and the receiving pilot signal on each receiving antenna, namely, a channel matrix corresponding to each time-frequency resource position can be obtained, and then the optimal CSI information can be calculated according to the channel matrix. The CSI generally includes three types of PMI (Precoding Matrix index)/CQI (channel quality Indicator)/RI (Rank Indicator) information, and a Precoding Matrix, channel quality information, and the number of transmission layers are recommended to the base station in a feedback manner, respectively. And the terminal feeds back the calculated CQI/PMI/RI information to the base station through a control channel of an uplink physical layer or a data channel of the uplink physical layer. And the base station determines the number of transmission layers, the coding modulation mode and the sending precoding based on the feedback information of the terminal.
Therefore, the downlink channel information measurement pilot frequency CSI-RS plays a very important role in the acquisition process of the channel state information, and often affects the accuracy of the precoding information, the channel quality information, and the number of transmission layers information, thereby having a very large effect on the transmission performance of MIMO.
The downlink CSI-RS pilot frequency adopted in the 4G standard is a periodic CSI-RS pilot frequency, and in the time domain, considering that the change of a channel is not suddenly changed, the channel has certain time domain correlation, and the correlation time is longer than the duration 1ms of one subframe, so that all subframes are not required to be transmitted, and in order to save the overhead, the CSI-RS is generally transmitted periodically. The concept of the periodic pilot is that a base station transmits CSI-RS at certain periodic intervals, and the transmission positions may have different subframe position offsets.
As shown in table 1 below, in standard 36.211 of LTE, a CSI-RS subframe configuration (CSI reference signal subframe configuration) has the following structure:
TABLE 1
In Table 1, ICSI-RSThe configuration parameters of the CSI-RS are 0-154, and different values can correspond to different periods and subframe offsets of the CSI-RS. FIG. 1 shows a diagram of subframe position transmission corresponding to partial CSI-RS configuration examples, which correspond to I respectivelyCSI-RS＝0，ICSI-RS＝2，ICSI-RSConfiguration of 5.
In the frequency domain position, CSI-RS exists in each PRB (Physical Resource Block) pair, and the transmission pattern (pattern) of the same port is the same in different Physical Resource Block pairs (PRB pairs). The pattern (pattern) of the CSI-RS is shown in FIG. 2. The PRB pair may refer to the specification in LTE protocol 36.211, and typically includes 12 Frequency domain subcarriers and 14 time domain OFDM (Orthogonal Frequency Division Multiplexing) symbols.
In the LTE system, it is defined that 40 REs (Resource elements) in one PRB pair (pair) can be used as CSI-RS, and the PRB pair is divided into 5 patterns, where each pattern includes 8 REs, as shown in fig. 2. The CSI-RS pilot occupies 1RE per Port in one PRB pair on average, and all ports belonging to one CSI-RS resource (resource) need to be limited to one pattern # i shown in fig. 2. At present, the number of ports supported by a set of CSI-RS is 8 at most, so that when the number of ports is 8, 5 position candidates exist, and when the number of ports is 4, 10 positions are configurable. When the Port number is 2, there are 20 configurations.
The aperiodic CSI-RS is a pilot frequency triggered by a base station in real time, and the pilot frequency may be dynamically triggered, and may be sent for Channel measurement of a specific UE (User Equipment) or a UE group, exists in one or a few subframes, and does not perform long-time continuous transmission, and after the terminal obtains a sending position of the aperiodic CSI-RS through Control information transmitted in a PDCCH (Physical Downlink Control Channel) or an ePDCCH (Enhanced Physical Downlink Control Channel), pilot detection may be performed at a corresponding position. Compared with periodic pilot frequency, the aperiodic pilot frequency has the advantage of more flexible configuration and is very suitable for the pilot frequency configuration of UE specific, so that different UE can use different pilot frequency port virtualization technologies, and better channel information feedback efficiency can be obtained; when the number of users is small, the pilot frequency overhead is smaller than that of the periodic pilot frequency. As with the periodic CSI-RS, parameters (e.g., location, port number, sequence used) of the pilot transmission signal of the aperiodic CSI-RS may be pre-defined by the terminal with the base station or configured by higher layer signaling of the base station.
The aperiodic CSI-RS is generally a precoded pilot and is oriented to a specific user or a user group, but not oriented to all users in a cell, and the aperiodic CSI-RS can effectively reduce the number of ports during measurement by supporting precoding, thereby reducing the calculation amount of CSI feedback. Meanwhile, because the pilot frequency of each user is different, the users cannot share the pilot frequency like the periodic pilot frequency, and the resource utilization rate is reduced when the number of the users is large.
Therefore, there is a problem that the pilot resource utilization rate is low regardless of the periodic pilot or the aperiodic pilot.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a device for sending pilot frequency information and a method and a device for receiving pilot frequency information, which can improve the utilization rate of pilot frequency resources.
The embodiment of the invention provides a method for sending pilot frequency information, which is applied to a sending end and comprises the following steps:
configuring a first type channel measurement reference pilot signal for a receiving end;
determining a second type of channel measurement reference pilot signal generating interference on the first type of channel measurement reference pilot signal; sending parameter information of the second-type channel measurement reference pilot signal to the receiving end;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all of ports in the first type of channel measurement reference pilot signal.
Optionally, the parameters of the second type of channel measurement reference pilot signal include at least one of the following parameters:
the method comprises the steps of sending power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information.
Optionally, the method further comprises:
sending the set number K of the second type channel measurement reference pilot signals to a receiving end, wherein the K is greater than or equal to 1;
and sending interference port information of the first-class channel measurement reference pilot signals corresponding to the K sets of second-class channel measurement reference pilot signals to a receiving end.
Optionally, the configuring, for the receiving end, a first type of channel measurement reference pilot signal includes:
dividing the transmitting resources of the first type of channel measurement reference pilot signals configured for a receiving end into N groups, wherein N is greater than or equal to 1;
selecting M groups from N groups of sending resources of the first type channel measurement reference pilot signal, wherein M < ═ N;
the determining a second type of channel sounding reference pilot signal that interferes with the first type of channel sounding reference pilot signal comprises:
and determining a second-class channel measurement reference pilot signal corresponding to the transmission resource of the M groups of first-class channel measurement reference pilot signals.
Optionally, the transmission resource of the first type of channel measurement reference pilot signal includes: and sending time-frequency position resources of the first type of channel measurement reference pilot signals.
Optionally, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
The embodiment of the present invention further provides a device for sending pilot information, which is applied to a sending end, and includes:
the first configuration module is used for configuring a first type of channel measurement reference pilot signal for a receiving end;
a second configuration module, configured to determine a second type of channel measurement reference pilot signal that generates interference with the first type of channel measurement reference pilot signal; sending parameter information of the second-type channel measurement reference pilot signal to the receiving end;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all of ports in the first type of channel measurement reference pilot signal.
Optionally, the parameters of the second type of channel measurement reference pilot signal include at least one of the following parameters:
the method comprises the steps of sending power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information.
Optionally, the second configuration module is further configured to send a set number K of second-type channel measurement reference pilot signals to a receiving end, where K is greater than or equal to 1; and/or sending interference port information of the first-class channel measurement reference pilot signals corresponding to the K sets of second-class channel measurement reference pilot signals respectively to a receiving end.
Optionally, the first configuring module is configured to configure the first type of channel sounding reference pilot signal for the receiving end, and includes:
dividing the transmitting resources of the first type of channel measurement reference pilot signals configured for a receiving end into N groups, wherein N is greater than or equal to 1;
selecting M groups from N groups of sending resources of the first type channel measurement reference pilot signal, wherein M < ═ N;
a second configuration module for determining a second type of channel sounding reference pilot signal that interferes with the first type of channel sounding reference pilot signal, comprising:
and determining a second-class channel measurement reference pilot signal corresponding to the transmission resource of the M groups of first-class channel measurement reference pilot signals.
Optionally, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
The embodiment of the invention also provides a method for receiving the pilot frequency information, which is applied to a receiving end and comprises the following steps:
receiving configuration information of a first type of channel measurement reference pilot signal configured by a sending end;
receiving configuration information of a second type of channel measurement reference pilot signal generating interference on the first type of channel measurement reference pilot signal;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all of ports in the first type of channel measurement reference pilot signal.
Optionally, the parameters of the second type of channel measurement reference pilot signal include at least one of the following parameters:
the method comprises the steps of sending power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information.
Optionally, the method further comprises:
receiving the set number K of second-type channel measurement reference pilot signals sent by a sending end, wherein the K is greater than or equal to 1; and/or
And receiving interference port information of the first-class channel measurement reference pilot signals corresponding to the K sets of second-class channel measurement reference pilot signals respectively sent by the sending end.
Optionally, the receiving configuration information of the first type of channel measurement reference pilot signal configured by the transmitting end includes:
receiving configuration information of a first-class channel measurement reference pilot signal corresponding to M groups of sending resources selected from N groups of sending resources by a sending end;
the receiving configuration information of a second type of channel measurement reference pilot signal generating interference to the first type of channel measurement reference pilot signal includes:
and receiving configuration information of a second type channel measurement reference pilot signal corresponding to the sending resources of the M groups of first type channel measurement reference pilot signals.
Optionally, the transmission resource of the first type of channel measurement reference pilot signal includes: and sending time-frequency position resources of the first type of channel measurement reference pilot signals.
Optionally, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
The embodiment of the invention also provides a receiving device of the pilot frequency information, which is applied to a receiving end and comprises the following steps:
a first receiving module, configured to receive configuration information of a first-class channel measurement reference pilot signal configured by a sending end;
a second receiving module, configured to receive configuration information of a second type of channel measurement reference pilot signal that interferes with the first type of channel measurement reference pilot signal;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all of ports in the first type of channel measurement reference pilot signal.
Optionally, the parameters of the second type of channel measurement reference pilot signal include at least one of the following parameters:
the method comprises the steps of sending power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information.
Optionally, the second receiving module is further configured to receive a set number K of second-type channel measurement reference pilot signals sent by the sending end, where K is greater than or equal to 1; and/or receiving interference port information of the first-class channel measurement reference pilot signals corresponding to the K sets of second-class channel measurement reference pilot signals sent by the sending end respectively.
Optionally, the first receiving module is configured to receive configuration information of a first type of channel measurement reference pilot signal configured by a transmitting end, and includes:
receiving configuration information of a first-class channel measurement reference pilot signal corresponding to M groups of sending resources selected from N groups of sending resources by a sending end;
a second receiving module, configured to receive configuration information of a second type of channel measurement reference pilot signal that interferes with the first type of channel measurement reference pilot signal, including:
and receiving configuration information of a second type channel measurement reference pilot signal corresponding to the sending resources of the M groups of first type channel measurement reference pilot signals.
Optionally, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
The embodiment of the invention also provides a method for sending the pilot frequency information, which is applied to a sending end and comprises the following steps:
determining a channel measurement reference pilot signal configured for a receiving end;
and sending the port number of the channel measurement reference pilot signal to the receiving end.
Optionally, the method further comprises:
and sending the port number of the channel measurement reference pilot signal to the receiving end.
Optionally, determining a channel measurement reference pilot signal configured for the receiving end includes:
selecting 1 port from a port set P, wherein the ports in the port set P are multiplexed in a code division mode;
optionally, the port set P is { port15, port 16 };
the port15 and the port 16 are ports of a channel state information measurement reference signal in a long term evolution LTE system;
and the port selection information is notified to the receiving end through high-level or physical-level signaling.
Optionally, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
The embodiment of the present invention further provides a device for sending pilot information, which is applied to a sending end, and includes:
the configuration module is used for determining a channel measurement reference pilot signal configured for a receiving end;
a sending module, configured to send the number of ports of the channel measurement reference pilot signal to the receiving end.
Optionally, the sending module is further configured to send the port number of the channel measurement reference pilot signal to the receiving end.
Optionally, the configuring module is configured to determine a channel measurement reference pilot signal configured for the receiving end, and includes:
selecting 1 port from a port set P, wherein the ports in the port set P are multiplexed in a code division mode;
optionally, the port set P is { port15, port 16 };
the port15 and the port 16 are ports of a channel state information measurement reference signal in a long term evolution LTE system;
and the port selection information is notified to the receiving end through high-level or physical-level signaling.
Optionally, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
The embodiment of the invention also provides a method for receiving the pilot frequency information, which is applied to a receiving end and comprises the following steps:
determining the port number of a channel measurement reference pilot signal configured by a sending end;
and determining the port number according to the physical layer configuration signaling, the high layer configuration signaling or blind detection.
Optionally, when the number of the ports is 1, determining the port number according to a physical layer configuration signaling, a high layer configuration signaling, or blind detection includes:
selecting 1 port from a port set P, wherein the ports in the port set P are multiplexed in a code division mode.
Optionally, the port set P is { port15, port 16 };
the port15 and the port 16 are ports of a channel state information measurement reference signal in a long term evolution LTE system.
Optionally, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
The embodiment of the invention also provides a receiving device of the pilot frequency information, which is applied to a receiving end and comprises the following steps:
the first acquisition module is used for determining the port number of the channel measurement reference pilot signal configured by the sending end;
and the second acquisition module is used for determining the port number according to the physical layer configuration signaling, the high layer configuration signaling or blind detection.
Optionally, the second obtaining module is configured to determine, when the number of the ports is 1, a port number according to a physical layer configuration signaling, a high layer configuration signaling, or blind detection, and includes:
selecting 1 port from a port set P, wherein the ports in the port set P are multiplexed in a code division mode.
Optionally, the port set P is { port15, port 16 };
the port15 and the port 16 are ports of a channel state information measurement reference signal in a long term evolution LTE system.
Optionally, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
Compared with the prior art, the method and the device for sending the pilot frequency information, the method and the device for receiving the pilot frequency information, provided by the invention, have the advantages that the base station informs the terminal of the interference pilot frequency information during the space division multiplexing of the pilot frequency signal, so that the terminal can eliminate the interference during the pilot frequency signal receiving, and the utilization rate of the pilot frequency resource is improved. On the other hand, the pilot frequency port is flexibly configured, so that the utilization rate of pilot frequency resources is improved.
Drawings
Fig. 1 is a diagram illustrating subframe position transmission corresponding to a CSI-RS configuration example in LTE.
Fig. 2 is a schematic diagram of CSI-RS Pattern in LTE.
Fig. 3 is a flowchart of a method (transmitting end) for transmitting pilot information according to an embodiment of the present invention.
Fig. 4 is a flowchart of a method (receiving end) for transmitting pilot information according to an embodiment of the present invention.
Fig. 5 is a flowchart of another method (transmitting end) for transmitting pilot information according to an embodiment of the present invention.
Fig. 6 is a flowchart of another method (receiving end) for transmitting pilot information according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a pilot information transmitting apparatus (transmitting end) according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of a pilot information transmitting apparatus (receiving end) according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of another apparatus (transmitting end) for transmitting pilot information according to an embodiment of the present invention.
Fig. 10 is a schematic diagram of another pilot information transmitting apparatus (receiving end) according to an embodiment of the present invention.
Fig. 11-a is a diagram of pilot interference (two pilot signals) in example 1 of the present invention.
Fig. 11-b is a diagram of pilot interference (three pilot signals) in example 1 of the present invention.
Fig. 12 is a diagram illustrating pilot interference in example 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
As shown in fig. 3, an embodiment of the present invention provides a method for sending pilot information, which is applied to a sending end, and the method includes:
s110, configuring a first type channel measurement reference pilot signal for a receiving end;
s120, determining a second type of channel measurement reference pilot signal generating interference on the first type of channel measurement reference pilot signal; sending parameter information of the second-type channel measurement reference pilot signal to the receiving end;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all ports in the first type of channel measurement reference pilot signal;
wherein the first type of channel measurement reference pilot signal comprises one or more ports;
wherein the parameters of the second type of channel measurement reference pilot signals comprise at least one of the following parameters:
transmitting power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information;
sending the set number K of second type channel measurement reference pilot signals to a receiving end, wherein the K is greater than or equal to 1;
sending interference port information of first-class channel measurement reference pilot signals corresponding to K sets of second-class channel measurement reference pilot signals respectively to a receiving end;
the configuring the first type of channel measurement reference pilot signal for the receiving end includes:
dividing the transmitting resources of the first type of channel measurement reference pilot signals configured for a receiving end into N groups, wherein N is greater than or equal to 1;
selecting M groups from N groups of sending resources of the first type channel measurement reference pilot signal, wherein M < ═ N;
wherein the determining of the second type of channel sounding reference pilot signal that interferes with the first type of channel sounding reference pilot signal comprises:
determining a second type channel measurement reference pilot signal corresponding to the sending resource of the M groups of first type channel measurement reference pilot signals;
wherein, the transmission resource of the first type of channel measurement reference pilot signal comprises: sending time-frequency position resources of the first type of channel measurement reference pilot signals;
the first channel measurement reference pilot signal is a downlink pre-coding measurement reference pilot signal;
wherein, the receiving end includes: a user terminal;
the transmitting end comprises: a base station;
as shown in fig. 4, an embodiment of the present invention provides a method for sending pilot information, where the method is applied to a sending end, and the method includes:
s410, determining a channel measurement reference pilot signal configured for a receiving end;
s420, sending the number n of ports of the channel measurement reference pilot signal to the receiving end;
wherein the method further comprises:
sending the port number of the channel measurement reference pilot signal to the receiving end;
the determining of the channel measurement reference pilot signal configured for the receiving end includes:
selecting 1 port from a port set P, wherein the ports in the port set P are multiplexed in a code division mode;
the method further comprises the following steps:
sending port selection information to the receiving end;
the port selection information includes: a port number;
wherein the port set P is { port15, port 16 };
wherein the port set P is { port15, port 16, port 17, port 18 };
the port15 and the port 16 are ports of a channel state information measurement reference signal in a long term evolution LTE system;
the port selection information is notified to the receiving end through high-level or physical-level signaling;
wherein, the receiving end includes: a user terminal;
the transmitting end comprises: a base station;
as shown in fig. 5, an embodiment of the present invention provides a method for receiving pilot information, which is applied to a receiving end, and the method includes:
s510, receiving configuration information of a first type of channel measurement reference pilot signal configured by a sending end;
s520, receiving configuration information of a second type of channel measurement reference pilot signal generating interference to the first type of channel measurement reference pilot signal;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all ports in the first type of channel measurement reference pilot signal;
wherein the first type of channel measurement reference pilot signal comprises one or more ports;
wherein the parameters of the second type of channel measurement reference pilot signals comprise at least one of the following parameters:
transmitting power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information;
wherein the method further comprises:
receiving the set number K of second-type channel measurement reference pilot signals sent by a sending end, wherein the K is greater than or equal to 1; and/or
And receiving interference port information of the first-class channel measurement reference pilot signals corresponding to the K sets of second-class channel measurement reference pilot signals respectively sent by the sending end.
The receiving of the configuration information of the first-type channel measurement reference pilot signal configured by the transmitting end includes:
receiving configuration information of a first-class channel measurement reference pilot signal corresponding to M groups of sending resources selected from N groups of sending resources by a sending end;
the receiving configuration information of a second type of channel measurement reference pilot signal generating interference to the first type of channel measurement reference pilot signal includes:
receiving configuration information of a second type channel measurement reference pilot signal corresponding to the sending resources of the M groups of first type channel measurement reference pilot signals;
wherein, the transmission resource of the first type of channel measurement reference pilot signal comprises: sending time-frequency position resources of the first type of channel measurement reference pilot signals;
the first channel measurement reference pilot signal is a downlink pre-coding measurement reference pilot signal;
wherein, the receiving end includes: a user terminal;
the transmitting end comprises: a base station;
as shown in fig. 6, an embodiment of the present invention provides a method for receiving pilot information, which is applied to a receiving end, and the method includes:
s610, determining the port number n of the channel measurement reference pilot signal configured by the sending end;
s620, determining a port number according to the physical layer configuration signaling, the high layer configuration signaling or blind detection;
wherein the method further comprises:
when the number n of the ports is 1, determining the port number according to physical layer configuration signaling, high layer configuration signaling or blind detection, including:
selecting 1 port from a port set P, wherein the ports in the port set P are multiplexed in a code division mode;
wherein the port set P is { port15, port 16 };
the port15 and the port 16 are ports of a channel state information measurement reference signal in a long term evolution LTE system;
wherein, the receiving end includes: a user terminal;
the transmitting end comprises: a base station;
as shown in fig. 7, an embodiment of the present invention provides a device for sending pilot information, which is applied to a sending end, and includes:
the first configuration module is used for configuring a first type of channel measurement reference pilot signal for a receiving end;
a second configuration module, configured to determine a second type of channel measurement reference pilot signal that generates interference with the first type of channel measurement reference pilot signal; sending parameter information of the second-type channel measurement reference pilot signal to the receiving end;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all of ports in the first type of channel measurement reference pilot signal.
Wherein the parameters of the second type of channel measurement reference pilot signals comprise at least one of the following parameters:
the method comprises the steps of sending power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information.
The second configuration module is further configured to send the set number K of the second type of channel measurement reference pilot signals to a receiving end, where K is greater than or equal to 1; and/or sending interference port information of the first-class channel measurement reference pilot signals corresponding to the K sets of second-class channel measurement reference pilot signals respectively to a receiving end.
The first configuration module is configured to configure a first type of channel measurement reference pilot signal for a receiving end, and includes:
dividing the transmitting resources of the first type of channel measurement reference pilot signals configured for a receiving end into N groups, wherein N is greater than or equal to 1;
selecting M groups from N groups of sending resources of the first type channel measurement reference pilot signal, wherein M < ═ N;
a second configuration module for determining a second type of channel sounding reference pilot signal that interferes with the first type of channel sounding reference pilot signal, comprising:
and determining a second-class channel measurement reference pilot signal corresponding to the transmission resource of the M groups of first-class channel measurement reference pilot signals.
Wherein, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
The first type of channel measurement reference pilot signal is a downlink pre-coding measurement reference pilot signal.
As shown in fig. 8, an embodiment of the present invention provides a receiving apparatus for pilot information, which is applied to a receiving end, and includes:
a first receiving module, configured to receive configuration information of a first-class channel measurement reference pilot signal configured by a sending end;
a second receiving module, configured to receive configuration information of a second type of channel measurement reference pilot signal that interferes with the first type of channel measurement reference pilot signal;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all of ports in the first type of channel measurement reference pilot signal.
Wherein the parameters of the second type of channel measurement reference pilot signals comprise at least one of the following parameters:
the method comprises the steps of sending power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information.
The second receiving module is further configured to receive a set number K of second-type channel measurement reference pilot signals sent by the sending end, where K is greater than or equal to 1; and/or receiving interference port information of the first-class channel measurement reference pilot signals corresponding to the K sets of second-class channel measurement reference pilot signals sent by the sending end respectively.
The first receiving module is configured to receive configuration information of a first type of channel measurement reference pilot signal configured by a sending end, and includes:
receiving configuration information of a first-class channel measurement reference pilot signal corresponding to M groups of sending resources selected from N groups of sending resources by a sending end;
a second receiving module, configured to receive configuration information of a second type of channel measurement reference pilot signal that interferes with the first type of channel measurement reference pilot signal, including:
and receiving configuration information of a second type channel measurement reference pilot signal corresponding to the sending resources of the M groups of first type channel measurement reference pilot signals.
Wherein, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
The first type of channel measurement reference pilot signal is a downlink pre-coding measurement reference pilot signal.
As shown in fig. 9, an embodiment of the present invention provides a pilot information sending apparatus, which is applied to a sending end, and includes:
the configuration module is used for determining a channel measurement reference pilot signal configured for a receiving end;
and the sending module is used for sending the port number n of the channel measurement reference pilot signal to the receiving end.
The sending module is further configured to send the port number of the channel measurement reference pilot signal to the receiving end.
The configuration module is configured to determine a channel measurement reference pilot signal configured for a receiving end, and includes:
selecting 1 port from a port set P, wherein the ports in the port set P are multiplexed in a code division mode;
wherein the port set P is { port15, port 16 };
the port15 and the port 16 are ports of a channel state information measurement reference signal in a long term evolution LTE system;
and the port selection information is notified to the receiving end through high-level or physical-level signaling.
Wherein, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
As shown in fig. 10, an embodiment of the present invention provides a receiving apparatus for pilot information, which is applied to a receiving end, and includes:
the first acquisition module is used for determining the port number n of the channel measurement reference pilot signal configured by the sending end;
and the second acquisition module is used for determining the port number according to the physical layer configuration signaling, the high layer configuration signaling or blind detection.
The second obtaining module is configured to determine, when the number n of the ports is 1, a port number according to a physical layer configuration signaling, a high layer configuration signaling, or blind detection, and includes:
selecting 1 port from a port set P, wherein the ports in the port set P are multiplexed in a code division mode.
Wherein the port set P is { port15, port 16 };
the port15 and the port 16 are ports of a channel state information measurement reference signal in a long term evolution LTE system.
Wherein, the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
Example 1
This example mainly introduces the interference notification technology of the measurement pilot, which can multiplex some pilot ports or pilot port groups with better spatial orthogonality, for example, multiple users in the system need to perform channel measurement based on the pre-coding measurement pilot, and assuming that there are UE1, UE2, and … … UEm, which respectively correspond to the port groups g1, g2 … … gm of the channel measurement, and find some pilots that have better orthogonality between them similar to that shown in fig. 11-a or fig. 11-b. However, in practice, there is almost no interference, and the pilot frequency is different from the data, the data can perform multi-user precoding at the transmitting end according to the information of the channel to eliminate the interference, the pilot frequency cannot perform interference elimination by these means, on one hand, the unknown property of the channel information does not support the interference elimination at the transmitting end, and on the other hand, the interference elimination at the transmitting end affects the accuracy of the channel measurement. Therefore, the present invention considers the interference cancellation at the receiving end.
As shown in fig. 11-a or fig. 11-b, for UEi, we define precoded CSI-RS i as a first type of measurement pilot for channel measurement, and at this time, precoded CSI-RS j and/or CSI-RS k may be defined as a second type of measurement pilot, which potentially generates interference to the first type of measurement pilot; after determining the multiplexing mode, the base station respectively configures the information of the CSI-RS i and part or all of the information of the CSI-RS j and/or the CSI-RS k to the terminal.
The information of the second type measurement pilot frequency CSI-RS j and/or CSI-RS k notified to the user terminal by the base station can comprise at least one of the following a-f information:
a) the transmission power indication information is used for indicating the pilot transmission power of the CSI-RS j and/or the CSI-RS k, and can be the power relative to the first type of measurement pilot CSI-RS i; or may be an absolute value of power
b) Sequence parameter indication information, which is used for indicating sequence information so that a terminal can know information source sequence information of interference pilot frequency to carry out interference elimination;
c) the orthogonal code length indication information is used for indicating the code division multiplexing length used by the pilot frequency of the CSI-RS j and/or the CSI-RS k;
d) pilot density indication information for indicating a density of pilot ports of the CSI-RS j and/or CSI-RS k, such as 1RE/port/RB or 0.5 RE/port/RB;
e) port number indication information for indicating the port number of the pilot of the CSI-RS j and/or the CSI-RS k so that the port number can determine the size of the interference region;
f) pilot pattern (pattern) indication information for indicating positions of pilots of the CSI-RS j and/or the CSI-RS k so as to determine a specific interfered position;
it is noted that although precoding CSI-RS is the main application scenario, non-precoding CSI-RS is equally applicable.
Example 2
In example 1, the number K of the second type measurement pilots mainly exemplifies 1 or 2 cases, and actually, is not limited to 2 at most and can be flexibly determined according to the cases;
when flexibly determining, the base station needs to configure the terminal with the value of K, for example, if 1bit signaling is used, K may be separately indicated as 0/1; if 2bit signaling is employed, K may be indicated 0/1/2/3, respectively;
example 3
In addition to the pilot interference scenario in FIG. 11-a or FIG. 11-b, the pilot interference scenario in FIG. 12 may also occur: different sets of transmission resources correspond to different second type measurement pilot signals. In the case of fig. 12, the base station needs to consider that the corresponding second-type measurement pilot information that causes interference is notified to some or all of the transmission resource groups of the first-type measurement pilot. The resource group sending is divided based on time-frequency resource or port number.
Example 4
The terminal detects the configuration signaling to obtain the information of the corresponding first type measurement pilot frequency and the second type measurement pilot frequency, after the information is obtained, the terminal can utilize some existing interference elimination methods to suppress the interference, for example, if the interference pilot frequency sequence can be obtained, the interference signal can be extracted by utilizing the correlation of the sequence, and the interference signal is subtracted from the received signal.
Example 5
This example primarily describes flexible pilot port configuration. A code division mode is adopted for a CSI-RS port, a base station firstly determines a channel measurement reference pilot frequency configured for a terminal, if the number of ports is 1, port index selection information needs to be informed, and a typical situation is that a plurality of sets of pilot frequencies with the ports being 1 are configured to perform CSI-RS selection; the base station can support the port index selection information through high-level signaling; for example, 1bit to indicate whether port15 or 16 of code division multiplexing; may also be indicated by physical layer signaling; if there are more pilot code multiplexes in future versions, such as port15,16,17,18, a specific port index can be signaled in a similar manner;
example 6
In example 5, if the base station flexibly selects a port from a set of ports, but does not notify the terminal, the terminal may determine a port index by blindly detecting the ports included in the set, and perform channel measurement, where the set of ports may be { port15,16} or { port15,16,17,18 }.
In the method and the apparatus for transmitting and receiving pilot information and the apparatus for receiving pilot information provided in the foregoing embodiments, the base station notifies the terminal of the interference pilot information during space division multiplexing of the pilot signal, so that the terminal can perform interference cancellation when receiving the pilot signal, thereby improving the pilot resource utilization rate. On the other hand, the pilot frequency port is flexibly configured, so that the utilization rate of pilot frequency resources is improved.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the foregoing embodiments may also be implemented by using one or more integrated circuits, and accordingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
It should be noted that the present invention can be embodied in other specific forms, and various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (22)
1. A method for sending pilot frequency information is applied to a sending end, and comprises the following steps:
configuring a first type channel measurement reference pilot signal for a receiving end;
determining a second type of channel measurement reference pilot signal generating interference on the first type of channel measurement reference pilot signal; sending parameter information of the second-type channel measurement reference pilot signal to the receiving end;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all of ports in the first type of channel measurement reference pilot signal.
2. The method of claim 1, wherein:
the parameters of the second type of channel measurement reference pilot signal comprise at least one of the following parameters:
the method comprises the steps of sending power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information.
3. The method of claim 1, wherein the method further comprises:
sending the set number K of the second type channel measurement reference pilot signals to a receiving end, wherein the K is greater than or equal to 1;
and sending interference port information of the first-class channel measurement reference pilot signals corresponding to the K sets of second-class channel measurement reference pilot signals to a receiving end.
4. The method of claim 1, wherein:
the configuring the first type of channel measurement reference pilot signal for the receiving end includes:
dividing the transmitting resources of the first type of channel measurement reference pilot signals configured for a receiving end into N groups, wherein N is greater than or equal to 1;
selecting M groups from N groups of sending resources of the first type channel measurement reference pilot signal, wherein M < ═ N;
the determining a second type of channel sounding reference pilot signal that interferes with the first type of channel sounding reference pilot signal comprises:
and determining a second-class channel measurement reference pilot signal corresponding to the transmission resource of the M groups of first-class channel measurement reference pilot signals.
5. The method of claim 4, wherein:
the transmission resources of the first type of channel measurement reference pilot signals comprise: and sending time-frequency position resources of the first type of channel measurement reference pilot signals.
6. The method of any one of claims 1-5, wherein:
the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
7. A sending device of pilot frequency information is applied to a sending end and comprises:
the first configuration module is used for configuring a first type of channel measurement reference pilot signal for a receiving end;
a second configuration module, configured to determine a second type of channel measurement reference pilot signal that generates interference with the first type of channel measurement reference pilot signal; sending parameter information of the second-type channel measurement reference pilot signal to the receiving end;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all of ports in the first type of channel measurement reference pilot signal.
8. The apparatus of claim 7, wherein:
the parameters of the second type of channel measurement reference pilot signal comprise at least one of the following parameters:
the method comprises the steps of sending power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information.
9. The apparatus of claim 7, wherein:
the second configuration module is further configured to send the set number K of the second type channel measurement reference pilot signals to the receiving end, where K is greater than or equal to 1; and/or sending interference port information of the first-class channel measurement reference pilot signals corresponding to the K sets of second-class channel measurement reference pilot signals respectively to a receiving end.
10. The apparatus of claim 7, wherein:
a first configuration module, configured to configure a first type of channel measurement reference pilot signal for a receiving end, including:
dividing the transmitting resources of the first type of channel measurement reference pilot signals configured for a receiving end into N groups, wherein N is greater than or equal to 1;
selecting M groups from N groups of sending resources of the first type channel measurement reference pilot signal, wherein M < ═ N;
a second configuration module for determining a second type of channel sounding reference pilot signal that interferes with the first type of channel sounding reference pilot signal, comprising:
and determining a second-class channel measurement reference pilot signal corresponding to the transmission resource of the M groups of first-class channel measurement reference pilot signals.
11. The apparatus of any one of claims 7-10, wherein:
the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
12. A receiving method of pilot frequency information is applied to a receiving end, and the method comprises the following steps:
receiving configuration information of a first type of channel measurement reference pilot signal configured by a sending end;
receiving configuration information of a second type of channel measurement reference pilot signal generating interference on the first type of channel measurement reference pilot signal;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all of ports in the first type of channel measurement reference pilot signal.
13. The method of claim 12, wherein:
the parameters of the second type of channel measurement reference pilot signal comprise at least one of the following parameters:
the method comprises the steps of sending power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information.
14. The method of claim 12, wherein the method further comprises:
receiving the set number K of second-type channel measurement reference pilot signals sent by a sending end, wherein the K is greater than or equal to 1; and/or
And receiving interference port information of the first-class channel measurement reference pilot signals corresponding to the K sets of second-class channel measurement reference pilot signals respectively sent by the sending end.
15. The method of claim 12, wherein:
the receiving of the configuration information of the first-type channel measurement reference pilot signal configured by the transmitting end includes:
receiving configuration information of a first-class channel measurement reference pilot signal corresponding to M groups of sending resources selected from N groups of sending resources by a sending end;
the receiving configuration information of a second type of channel measurement reference pilot signal generating interference to the first type of channel measurement reference pilot signal includes:
and receiving configuration information of a second type channel measurement reference pilot signal corresponding to the sending resources of the M groups of first type channel measurement reference pilot signals.
16. The method of claim 15, wherein:
the transmission resources of the first type of channel measurement reference pilot signals comprise: and sending time-frequency position resources of the first type of channel measurement reference pilot signals.
17. The method of any one of claims 12-16, wherein:
the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
18. A receiving device of pilot frequency information is applied to a receiving end and comprises:
a first receiving module, configured to receive configuration information of a first-class channel measurement reference pilot signal configured by a sending end;
a second receiving module, configured to receive configuration information of a second type of channel measurement reference pilot signal that interferes with the first type of channel measurement reference pilot signal;
the first type of channel measurement reference pilot signal is used for the receiving end to perform channel measurement, and the second type of channel measurement reference pilot signal generates interference on part or all of ports in the first type of channel measurement reference pilot signal.
19. The apparatus of claim 18, wherein:
the parameters of the second type of channel measurement reference pilot signal comprise at least one of the following parameters:
the method comprises the steps of sending power indication information, sequence parameter indication information, orthogonal code length indication information, pilot frequency density indication information, port number indication information and pilot frequency pattern indication information.
20. The apparatus of claim 18, wherein:
the second receiving module is further configured to receive the set number K of the second type of channel measurement reference pilot signals sent by the sending end, where K is greater than or equal to 1; and/or receiving interference port information of the first-class channel measurement reference pilot signals corresponding to the K sets of second-class channel measurement reference pilot signals sent by the sending end respectively.
21. The apparatus of claim 18, wherein:
a first receiving module, configured to receive configuration information of a first type of channel measurement reference pilot signal configured by a sending end, including:
receiving configuration information of a first-class channel measurement reference pilot signal corresponding to M groups of sending resources selected from N groups of sending resources by a sending end;
a second receiving module, configured to receive configuration information of a second type of channel measurement reference pilot signal that interferes with the first type of channel measurement reference pilot signal, including:
and receiving configuration information of a second type channel measurement reference pilot signal corresponding to the sending resources of the M groups of first type channel measurement reference pilot signals.
22. The apparatus of any one of claims 18-21, wherein:
the receiving end includes: a user terminal;
the transmitting end comprises: and a base station.
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| CN201610319112.2A CN107370584B (en) | 2016-05-13 | 2016-05-13 | Pilot frequency information sending method and device and pilot frequency information receiving method and device |
| PCT/CN2017/084214 WO2017194010A1 (en) | 2016-05-13 | 2017-05-12 | Pilot information transmitting method and device, and pilot information receiving method and device |
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| CN201610319112.2A CN107370584B (en) | 2016-05-13 | 2016-05-13 | Pilot frequency information sending method and device and pilot frequency information receiving method and device |
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| WO2019222882A1 (en) * | 2018-05-21 | 2019-11-28 | Nokia Shanghai Bell Co., Ltd. | Channel state information feedback |
| CN111106842B (en) * | 2018-10-25 | 2022-04-22 | 中兴通讯股份有限公司 | Method for eliminating adjacent channel interference, electronic equipment and readable storage medium |
| CN110943819B (en) * | 2019-10-30 | 2022-08-30 | 深圳供电局有限公司 | Pilot frequency distribution method and device, computer equipment and computer readable storage medium |
| CN112994832B (en) * | 2019-12-13 | 2023-03-31 | 中国移动通信有限公司研究院 | Parameter determination method and device, related equipment and storage medium |
| CN116264488A (en) * | 2021-12-14 | 2023-06-16 | 维沃移动通信有限公司 | Interference measurement method, device, equipment and storage medium |
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| CN102055508A (en) * | 2009-11-02 | 2011-05-11 | 富士通株式会社 | Pilot frequency transmitting method and corresponding channel estimation method |
| CN102118867A (en) * | 2009-12-31 | 2011-07-06 | 电信科学技术研究院 | Measurement pilot transmission method and device |
| KR101241916B1 (en) * | 2010-02-07 | 2013-03-11 | 엘지전자 주식회사 | A method for transmitting downlink reference signal in multi-carrier supporting wireless communication system and an apparatus for the same |
| CN103763071B (en) * | 2010-08-02 | 2017-04-12 | 华为技术有限公司 | Method and device for notifying reference signal configuration information |
| EP3270652A1 (en) * | 2010-09-15 | 2018-01-17 | Huawei Technologies Co., Ltd. | System and method for channel state information feedback in wireless communications systems |
| US8982866B1 (en) * | 2010-10-08 | 2015-03-17 | Marvell International Ltd. | Data channel noise estimation using control channel |
| CN102195673A (en) * | 2011-02-25 | 2011-09-21 | 福建三元达通讯股份有限公司 | Method for eliminating pilot pollution |
| CN103840907B (en) * | 2012-11-20 | 2018-06-05 | 电信科学技术研究院 | A kind of method, system and equipment for transmitting pilot signal and signal measurement |
| US20140376464A1 (en) * | 2013-06-21 | 2014-12-25 | Electronics & Telecommunications Research Institute | Method for communication using large-scale antenna in multi-cell environment |
| CN105515725B (en) * | 2014-09-26 | 2020-07-07 | 中兴通讯股份有限公司 | Pilot frequency sending method, channel information measurement feedback method, sending end and receiving end |
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