CN108322245B - Channel state reference signal sending method, device and receiving method and mobile terminal - Google Patents
Channel state reference signal sending method, device and receiving method and mobile terminal Download PDFInfo
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- CN108322245B CN108322245B CN201710030892.3A CN201710030892A CN108322245B CN 108322245 B CN108322245 B CN 108322245B CN 201710030892 A CN201710030892 A CN 201710030892A CN 108322245 B CN108322245 B CN 108322245B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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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
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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Abstract
The invention provides a channel state reference signal sending method, a channel state reference signal sending device, a channel state reference signal receiving method and a mobile terminal, wherein the method comprises the following steps: dividing all antenna ports into a preset number of port groups, wherein each port group comprises a plurality of antenna ports; determining and sending the reference signals of the antenna ports sent on each physical resource block PRB corresponding to the current reference signal sending period according to the position of the current reference signal sending period in the preset cyclic period and the preset cyclic shift rule; the cyclic shift rule includes: and sequentially transmitting the reference signals of the port groups on different PRBs corresponding to the same frequency domain in a cycle period, and sequentially transmitting the reference signals of the port groups on the PRBs corresponding to the same reference signal transmission period. For a certain antenna port, the link channel state information reference signals are sequentially and circularly transmitted on each PRB, so that the transmission of the channel state reference signals of all antenna ports on each PRB can be completed, and the accuracy of channel estimation is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for sending a channel state reference signal, a method for receiving the channel state reference signal, and a mobile terminal.
Background
A Full-dimensional multiple-Input-multiple-Output (FD-MIMO) technology adopts a two-dimensional active large-scale antenna array, can fully utilize spatial degrees of freedom in horizontal and vertical dimensions to realize 3D beamforming, and simultaneously provides services for a large number of terminals at the same frequency, thereby greatly improving system capacity, and is widely regarded as one of 5G key technologies. Currently, the latest 3GPP TS 36.211R13 can support downlink Channel State information reference Signal (CSI-RS) design for 16 transmit antennas at most. However, FD-MIMO technology in future 5G systems is likely to employ more antennas (e.g. 32, 64, 128, or even 256), and more antennas means more Resource Elements (REs) will be allocated for CSI-RS, thereby greatly reducing the resources for transmitting effective transmission data.
The conventional transmission method of the link channel state information reference signal generally adopts a frequency division multiplexing method. In the transmission process of frequency division multiplexing, for a certain antenna port, a link channel state information reference signal is always transmitted on certain fixed PRBs (Physical Resource blocks), and other PRBs are obtained by difference values, so that the performance of channel estimation in a frequency domain is deteriorated, and the channel estimation accuracy is poor.
Disclosure of Invention
The embodiment of the invention provides a channel state reference signal sending method, a channel state reference signal sending device, a channel state reference signal receiving method and a mobile terminal, and aims to solve the problem of poor channel estimation accuracy.
In a first aspect, an embodiment of the present invention provides a method for sending a channel state reference signal, including:
dividing all antenna ports into a preset number of port groups, wherein each port group comprises a plurality of antenna ports;
determining and sending the reference signals of the antenna ports sent on each physical resource block PRB corresponding to the current reference signal sending period according to the position of the current reference signal sending period in the preset cyclic period and the preset cyclic shift rule;
wherein the cyclic period includes a reference signal transmission period that is an integral multiple of the preset number, and the cyclic shift rule includes: and sequentially transmitting the reference signals of the port groups on different PRBs corresponding to the same frequency domain in the cycle period, and sequentially transmitting the reference signals of the port groups on the PRBs corresponding to the same reference signal transmission period.
In a second aspect, an embodiment of the present invention further provides a method for receiving a link channel state information reference signal, including:
receiving a cyclic shift rule sent by a base station;
determining a reference signal sent in a PRB currently transmitted by a base station according to the shifting rule;
estimating downlink Channel State Information (CSI) of all antenna ports in the currently transmitted PRB according to a time-frequency two-dimensional interpolation algorithm;
the method comprises the steps of sequentially sending reference signals of all port groups on different PRBs corresponding to the same frequency domain in a cycle period, and sequentially sending the reference signals of all the port groups on all the PRBs corresponding to the same reference signal sending period.
In a third aspect, an embodiment of the present invention further provides a device for sending a channel state reference signal, including:
the grouping module is used for dividing all the antenna ports into a preset number of port groups, and each port group comprises a plurality of antenna ports;
the transmission determining module is used for determining and transmitting the reference signals of the antenna ports transmitted on each physical resource block PRB corresponding to the current reference signal transmission period according to the position of the current reference signal transmission period in the preset cyclic period and the preset cyclic shift rule;
wherein the cyclic period includes a reference signal transmission period that is an integral multiple of the preset number, and the cyclic shift rule includes: and sequentially transmitting the reference signals of the port groups on different PRBs corresponding to the same frequency domain in the cycle period, and sequentially transmitting the reference signals of the port groups on the PRBs corresponding to the same reference signal transmission period.
In a third aspect, an embodiment of the present invention further provides a mobile terminal, including:
a receiving module, configured to receive a cyclic shift rule sent by a base station;
a reference signal determining module, configured to determine, according to the shift rule, a reference signal sent in a PRB currently transmitted by a base station;
the estimation module is used for estimating the downlink channel state information CSI of all antenna ports in the currently transmitted PRB according to a time-frequency two-dimensional interpolation algorithm;
the method comprises the steps of sequentially sending reference signals of all port groups on different PRBs corresponding to the same frequency domain in a cycle period, and sequentially sending the reference signals of all the port groups on all the PRBs corresponding to the same reference signal sending period.
In this way, in the embodiment of the present invention, all the antenna ports are divided into the port groups of the preset number, and each port group includes a plurality of antenna ports; determining and sending the reference signals of the antenna ports sent on each physical resource block PRB corresponding to the current reference signal sending period according to the position of the current reference signal sending period in the preset cyclic period and the preset cyclic shift rule; wherein the cyclic period includes a reference signal transmission period that is an integral multiple of the preset number, and the cyclic shift rule includes: and sequentially transmitting the reference signals of the port groups on different PRBs corresponding to the same frequency domain in the cycle period, and sequentially transmitting the reference signals of the port groups on the PRBs corresponding to the same reference signal transmission period. In the transmission process of frequency division multiplexing, for a certain antenna port, the link channel state information reference signal is circularly transmitted on each PRB in sequence, so that the transmission of the channel state reference signals of all antenna ports on each PRB can be completed, and the accuracy of channel estimation is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a channel state reference signal transmission method according to a first embodiment of the present invention;
fig. 2 is a diagram of a corresponding relationship between PRBs and an interface group in a channel state reference signal transmission method according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a time-frequency two-dimensional cyclic shift based transmission example of 32 antenna ports in a channel state reference signal transmission method according to an embodiment of the present invention;
fig. 4 is one of flowcharts of a channel state reference signal transmission method according to a second embodiment of the present invention;
fig. 5 is a second flowchart of a csi-rs transmission method according to a second embodiment of the present invention;
fig. 6 is a flowchart of a method for transmitting csi reference signals according to a third embodiment of the present invention;
fig. 7 is a structural diagram of a channel state reference signal transmission apparatus according to a fourth embodiment of the present invention;
fig. 8 is a block diagram of a mobile terminal according to a fifth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
First embodiment
Referring to fig. 1, fig. 1 is a flowchart of a method for sending a csi reference signal according to an embodiment of the present invention, as shown in fig. 1, including the following steps:
the channel state reference signal sending method provided by the embodiment of the invention is mainly applied to an FD-MIMO system with the number of antennas larger than or equal to 16 and used for managing the sending of the reference signal. In particular, the reference signal may comprise an uplink channel state information reference signal, SRS-RS, or a downlink channel state information reference signal, CSI-RS.
Specifically, the number of the antenna ports may be set according to actual needs, and in an embodiment, the number of the antenna ports may be 16, 32, 64, 128, or the like. The grouping condition of the antenna ports is related to the total number of the antenna ports and the number of the antenna ports used for transmitting the reference signal on each PRB, and the specific grouping number can be set according to the actual situation. For example, for an FD-MIMO system with an antenna port number of 32, if the number of antenna ports used for transmitting reference signals on each PRB is 8, all antenna ports may be divided into 4 port groups, where each port group includes 8 antenna ports. As shown in fig. 2, the port groups include a first port group, a second port group, a third port group and a fourth port group, wherein the number of antenna ports corresponding to the first port group is 15 to 22, the number of antenna ports corresponding to the second port group is 23 to 30, the number of antenna ports corresponding to the third port group is 31 to 38, and the number of antenna ports corresponding to the fourth port group is 39 to 46. In the following embodiments, the implementation process of each flow will be described in detail by taking this as an example.
102, determining and transmitting a reference signal of an antenna port transmitted on each physical resource block PRB corresponding to a current reference signal transmission period according to the position of the current reference signal transmission period in a preset cyclic period and a preset cyclic shift rule;
wherein the cyclic period includes a reference signal transmission period that is an integral multiple of the preset number, and the cyclic shift rule includes: and sequentially transmitting the reference signals of the port groups on different PRBs corresponding to the same frequency domain in the cycle period, and sequentially transmitting the reference signals of the port groups on the PRBs corresponding to the same reference signal transmission period.
In this step, when the 32 antenna ports are applied, the cycle period is 4 times the reference signal transmission period. That is, 4 transmission periods are required to be transmitted in one cycle period. The position of the current reference signal transmission period in the preset cycle period comprises that the current reference signal transmission period is the number of times of transmission in the cycle period. The time length of the reference signal transmission period may be set according to actual needs, for example, in this embodiment, optionally, the transmission period may be one subframe or one slot, where one subframe is two slots. In other embodiments, other time lengths may be used for definition, and are not further limited herein.
In this embodiment, sequentially sending the reference signals of each port group on different PRBs corresponding to the same frequency domain in the cycle period means that different PRBs in the same frequency domain send the reference signal of one port group in the current reference signal sending period, and send the reference signal of the next port group in the next reference signal sending period. As shown in fig. 3, the PRB0 transmits the reference signal of the first port group in the first reference signal transmission period, the PRB0 transmits the reference signal of the second port group in the second reference signal transmission period, the PRB0 transmits the reference signal of the third port group in the third reference signal transmission period, the PRB0 transmits the reference signal of the fourth port group in the fourth reference signal transmission period, and the PRB0 transmits the reference signal of the first port group in the first reference signal transmission period.
The reference signals of the port groups are sequentially transmitted on the PRBs corresponding to the same reference signal transmission period, for example, the PRB0 transmits the reference signal of the first port group, the PRB1 transmits the reference signal of the second port group, the PRB2 transmits the reference signal of the third port group, the PRB3 transmits the reference signal of the fourth port group, the PRB4 transmits the reference signal of the first port group, the PRB5 transmits the reference signal of the second port group, the PRB6 transmits the reference signal of the third port group, and the PRB7 transmits the reference signal of the fourth port group in the same reference signal transmission period.
In this way, in the embodiment of the present invention, all the antenna ports are divided into the port groups of the preset number, and each port group includes a plurality of antenna ports; determining and sending the reference signals of the antenna ports sent on each physical resource block PRB corresponding to the current reference signal sending period according to the position of the current reference signal sending period in the preset cyclic period and the preset cyclic shift rule; wherein the cyclic period includes a reference signal transmission period that is an integral multiple of the preset number, and the cyclic shift rule includes: and sequentially transmitting the reference signals of the port groups on different PRBs corresponding to the same frequency domain in the cycle period, and sequentially transmitting the reference signals of the port groups on the PRBs corresponding to the same reference signal transmission period. In the transmission process of frequency division multiplexing, for a certain antenna port, the link channel state information reference signal is circularly transmitted on each PRB in sequence, so that the transmission of the channel state reference signals of all antenna ports on each PRB can be completed, and the accuracy of channel estimation is improved.
Second embodiment
Further, based on the foregoing embodiment, in this embodiment, the cyclic shift rule further includes a cyclic shift index, and the determining, according to the position of the current reference signal transmission period in the preset cyclic period and the preset cyclic shift rule, the reference signal of the antenna port transmitted on each physical resource fast PRB corresponding to the current reference signal transmission period includes: number N according to PRBPRBAnd the sum of the current reference signal transmission period and the numerical value I identified by the position of the current reference signal transmission period in the preset cycle period is divided by the remainder obtained by the preset number to determine the port group to be transmitted of each PRB.
In the present embodiment, each PRB is correspondingly provided with its corresponding number, as shown in fig. 3, 4 PRBs are taken as an example for explanation, for example, the number of the PRB0 is 0, the number of the PRB1 is 1, the number of the PRB2 is 2, and the number of the PRB3 is 3. The position of the current reference signal transmission period in the preset cycle period comprises that the current reference signal transmission period is the transmission of the second time in the cycle period, for example, the first transmission, and the value identified by the position of the previous reference signal transmission period in the preset cycle period is 0; if the signal is transmitted for the second time, the value marked by the position of the transmission period of the front reference signal in the preset cycle period is 1; if the third transmission is carried out, the numerical value identified by the position of the front reference signal transmission period in the preset cycle period is 2; as in the fourth transmission, the value identified by the position of the pre-reference signal transmission period in the preset cycle period is 3.
In this embodiment, in a cyclic period, when a reference signal is transmitted for the first time, a remainder obtained by dividing a preset number by a sum of a number of each PRB and a numerical value identified by a position of a current reference signal transmission period in a preset cyclic period includes: the remainder value for PRB0 is 0, the remainder value for PRB1 is 1, the remainder value for PRB2 is 2, and the remainder value for PRB3 is 3. Therefore, it can be determined that the port group to be sent by the PRB is: the port groups transmitted by the PRB0 are 15-22, the port groups transmitted by the PRB1 are 23-30, the port groups transmitted by the PRB2 are 31-38, and the port groups transmitted by the PRB3 are 39-46.
When the reference signal is transmitted for the second time, according to the sum of the serial number of each PRB and the numerical value identified by the position of the current reference signal transmission period in the preset cycle period, the remainder obtained by dividing by the preset number includes: the remainder value for PRB0 is 1, the remainder value for PRB1 is 2, the remainder value for PRB2 is 3, and the remainder value for PRB3 is 4. Therefore, it can be determined that the port group to be sent by the PRB is: the port groups transmitted by the PRB0 are 23-30, the port groups transmitted by the PRB1 are 31-38, the port groups transmitted by the PRB2 are 39-46, and the port groups transmitted by the PRB3 are 15-22. And the like, and the cyclic shift is performed in sequence.
Further, in the above embodiment, the shifting manner is one bit per time, however, in other embodiments, a plurality of bits may be shifted. Specifically, different values may be set for the numerical value identified by the position of the current reference signal transmission period in the preset cycle period, for example, when two bits need to be shifted, the following setting may be performed: the current reference signal sending period is the first sending in the cycle period, and the numerical value marked by the position of the previous reference signal sending period in the preset cycle period is 0; the current reference signal sending period is the second sending in the cycle period, and the numerical value marked by the position of the previous reference signal sending period in the preset cycle period is 2; the current reference signal sending period is the third sending in the cycle period, and the numerical value identified by the position of the previous reference signal sending period in the preset cycle period is 4; the current reference signal transmission period is the fourth transmission in the cycle period, and the value identified by the position of the previous reference signal transmission period in the preset cycle period is 6.
Further, referring to fig. 4, before the step 102, the method further includes:
It should be noted that the above-mentioned channel state reference signal transmission method may be applied in a base station, and may also be applied in a relay (e.g. a signal amplifier) between the base station and a mobile terminal, and when the reference signal is an uplink channel state information reference signal SRS-RS, the channel state reference signal transmission method is applied in the relay, and the receiving terminal is the base station; when the reference signal is a downlink channel state information reference signal CSI-RS, the channel state reference signal transmission method is applied to a relay or a base station, and the receiving terminal is a mobile terminal.
In this embodiment, when the mobile terminal establishes RRC connection with the base station, the cyclic shift rule may be sent to a corresponding receiving terminal. After the receiving terminal receives the cyclic shift rule, it determines the reference signals transmitted in the transmitted PRBs.
Further, referring to fig. 5, before the step 101, the method further includes:
and 105, setting the calculated quotient to be subjected to a rounding operation as the preset number.
For example, for an FD-MIMO system with an antenna port number of 32, if the number of antenna ports used for transmitting reference signals on each PRB is 8, the preset number may be set to 4. In other embodiments, if a quotient obtained by dividing the total number of antenna ports by the maximum number of antenna ports used for transmitting the reference signal in each PRB carries a decimal point, a value obtained by performing an rounding operation may be set as the preset number. For example, the number of antenna ports is 32, and the number of antenna ports used for transmitting reference signals on each PRB is 7, the preset number may be set to 5, and the antenna ports may be divided into 8 groups, where 4 port groups are 7 antenna ports, and 1 port group is 4 antenna ports.
It should be noted that, if the number of PRBs divided by the number of port groups is not an integer, the reference signals of all antenna ports are cyclically transmitted in each PRB, so that the estimation accuracy of the link csi can be effectively improved.
Third embodiment
Referring to fig. 6, a flow chart of an embodiment of a link channel state information reference signal receiving method according to the present invention is provided, the link channel state information reference signal receiving method includes:
the method comprises the steps of sequentially sending reference signals of all port groups on different PRBs corresponding to the same frequency domain in a cycle period, and sequentially sending the reference signals of all the port groups on all the PRBs corresponding to the same reference signal sending period.
The link channel state information reference signal receiving method provided by the embodiment of the invention is mainly applied to a mobile terminal, when the mobile terminal accesses a base station network, a cyclic shift rule sent by a base station is received, then a reference signal CSI-RS sent by the base station and sent in a currently transmitted PRB is analyzed according to the cyclic shift rule, the correlation of a wireless channel in a time domain and a frequency domain is utilized, the downlink channel state information CSI of all antenna ports in the currently transmitted PRB is estimated through a time-frequency two-dimensional interpolation algorithm, and then the estimated CSI is fed back to the base station.
In the embodiment of the invention, a cyclic shift rule sent by a base station is received; determining a reference signal sent in a PRB currently transmitted by a base station according to the shifting rule; estimating downlink Channel State Information (CSI) of all antenna ports in the currently transmitted PRB according to a time-frequency two-dimensional interpolation algorithm; the method comprises the steps of sequentially sending reference signals of all port groups on different PRBs corresponding to the same frequency domain in a cycle period, and sequentially sending the reference signals of all the port groups on all the PRBs corresponding to the same reference signal sending period. In the transmission process of frequency division multiplexing, for a certain antenna port, the link channel state information reference signal is circularly transmitted on each PRB in sequence, so that the transmission of the channel state reference signals of all antenna ports on each PRB can be completed, and the accuracy of channel estimation is improved.
Fourth embodiment
Referring to fig. 7, fig. 7 is a structural diagram of a csi reference signal transmitting apparatus according to an embodiment of the present invention, which can achieve the details of the csi reference signal transmitting method in the first to second embodiments and achieve the same effects. As shown in fig. 7, the csi reference signal transmitter 700 includes:
a grouping module 701, configured to divide all antenna ports into port groups of a preset number, where each port group includes multiple antenna ports;
a sending determining module 702, configured to determine and send a reference signal of an antenna port sent on each physical resource block PRB corresponding to a current reference signal sending period according to a position of the current reference signal sending period in a preset cyclic period and a preset cyclic shift rule;
wherein the cyclic period includes a reference signal transmission period that is an integral multiple of the preset number, and the cyclic shift rule includes: and sequentially transmitting the reference signals of the port groups on different PRBs corresponding to the same frequency domain in the cycle period, and sequentially transmitting the reference signals of the port groups on the PRBs corresponding to the same reference signal transmission period.
Optionally, the sending determining module 702 is specifically configured to: and determining a port group to be transmitted of each PRB according to the remainder obtained by dividing the remainder obtained by the preset number by the sum of the number of the PRB and the numerical value identified by the position of the current reference signal transmission period in the preset cycle period.
Optionally, the apparatus further comprises:
and the sending module is used for sending the cyclic shift rule to a receiving terminal for receiving the reference signal, so that the receiving terminal can determine the reference signal sent in the currently transmitted PRB according to the cyclic shift rule and estimate the link channel state information of all antenna ports in the currently transmitted PRB according to a time-frequency two-dimensional interpolation algorithm.
Optionally, the apparatus further comprises:
a calculation module, configured to calculate a quotient obtained by dividing the total number of antenna ports by a maximum number of antenna ports used for transmitting a reference signal on each PRB;
and the setting module is used for setting the calculated quotient obtained by carrying out one-way rounding operation as the preset number.
Optionally, the reference signal includes an uplink channel state information reference signal SRS-RS or a downlink channel state information reference signal CSI-RS.
In this way, in the embodiment of the present invention, all the antenna ports are divided into the port groups of the preset number, and each port group includes a plurality of antenna ports; determining and sending the reference signals of the antenna ports sent on each physical resource block PRB corresponding to the current reference signal sending period according to the position of the current reference signal sending period in the preset cyclic period and the preset cyclic shift rule; wherein the cyclic period includes a reference signal transmission period that is an integral multiple of the preset number, and the cyclic shift rule includes: and sequentially transmitting the reference signals of the port groups on different PRBs corresponding to the same frequency domain in the cycle period, and sequentially transmitting the reference signals of the port groups on the PRBs corresponding to the same reference signal transmission period. In the transmission process of frequency division multiplexing, for a certain antenna port, the link channel state information reference signal is circularly transmitted on each PRB in sequence, so that the transmission of the channel state reference signals of all antenna ports on each PRB can be completed, and the accuracy of channel estimation is improved.
Fifth embodiment
Referring to fig. 8, fig. 8 is a structural diagram of a mobile terminal according to an embodiment of the present invention, which can implement details of a channel state reference signal transmission method in a third embodiment and achieve the same effect. As shown in fig. 8, the mobile terminal 800 includes:
a receiving module 801, configured to receive a cyclic shift rule sent by a base station;
a reference signal determining module 802, configured to determine, according to the shift rule, a reference signal sent in a PRB currently transmitted by a base station;
an estimating module 803, configured to estimate downlink channel state information CSI of all antenna ports in the currently transmitted PRB according to a time-frequency two-dimensional interpolation algorithm;
the method comprises the steps of sequentially sending reference signals of all port groups on different PRBs corresponding to the same frequency domain in a cycle period, and sequentially sending the reference signals of all the port groups on all the PRBs corresponding to the same reference signal sending period.
In the embodiment of the invention, a cyclic shift rule sent by a base station is received; determining a reference signal sent in a PRB currently transmitted by a base station according to the shifting rule; estimating downlink Channel State Information (CSI) of all antenna ports in the currently transmitted PRB according to a time-frequency two-dimensional interpolation algorithm; the method comprises the steps of sequentially sending reference signals of all port groups on different PRBs corresponding to the same frequency domain in a cycle period, and sequentially sending the reference signals of all the port groups on all the PRBs corresponding to the same reference signal sending period. In the transmission process of frequency division multiplexing, for a certain antenna port, the link channel state information reference signal is circularly transmitted on each PRB in sequence, so that the transmission of the channel state reference signals of all antenna ports on each PRB can be completed, and the accuracy of channel estimation is improved.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for transmitting csi (channel state reference signal), comprising:
dividing all antenna ports into a preset number of port groups, wherein each port group comprises a plurality of antenna ports;
sending a cyclic shift rule to a receiving terminal for receiving the reference signal, so that the receiving terminal determines the reference signal sent in the currently transmitted PRB according to the cyclic shift rule and estimates the link channel state information of all antenna ports in the currently transmitted PRB according to a time-frequency two-dimensional interpolation algorithm;
determining and sending the reference signals of the antenna ports sent on each physical resource block PRB corresponding to the current reference signal sending period according to the position of the current reference signal sending period in the preset cyclic period and the preset cyclic shift rule;
wherein the cyclic period includes a reference signal transmission period that is an integral multiple of the preset number, and the cyclic shift rule includes: and sequentially transmitting the reference signals of the port groups on different PRBs corresponding to the same frequency domain in the cycle period, and sequentially transmitting the reference signals of the port groups on the PRBs corresponding to the same reference signal transmission period.
2. The method according to claim 1, wherein the step of determining the reference signals of the antenna ports transmitted on each physical resource block PRB corresponding to the current reference signal transmission period according to the position of the current reference signal transmission period in a preset cyclic period and a preset cyclic shift rule comprises: and determining a port group to be transmitted of each PRB according to the remainder obtained by dividing the remainder obtained by the preset number by the sum of the number of the PRB and the numerical value identified by the position of the current reference signal transmission period in the preset cycle period.
3. The method according to any one of claims 1 to 2, wherein the step of dividing all antenna ports into a predetermined number of port groups is preceded by the step of:
calculating the quotient of the total number of antenna ports divided by the maximum number of antenna ports used for transmitting the reference signals on each PRB;
and setting the value obtained by carrying out one-way rounding operation on the calculated quotient as the preset number.
4. The method of claim 1, wherein the reference signal comprises an uplink channel state information reference signal or a downlink channel state information reference signal.
5. A method for receiving a link channel state information reference signal, the method comprising:
a receiving terminal receives a cyclic shift rule transmitted by a base station as a transmitting terminal;
the receiving terminal determines a reference signal sent in the PRB currently transmitted by the base station according to the cyclic shift rule;
the receiving terminal estimates the downlink channel state information CSI of all antenna ports in the currently transmitted PRB according to a time-frequency two-dimensional interpolation algorithm; wherein the cyclic shift rule is transmitted by a transmitting terminal to a receiving terminal for receiving the reference signal;
the method comprises the steps of sequentially sending reference signals of all port groups on different PRBs corresponding to the same frequency domain in a cycle period, and sequentially sending the reference signals of all the port groups on all the PRBs corresponding to the same reference signal sending period.
6. A channel state reference signal transmission apparatus, comprising:
the grouping module is used for dividing all the antenna ports into a preset number of port groups, and each port group comprises a plurality of antenna ports;
a sending module, configured to send a cyclic shift rule to a receiving terminal for receiving the reference signal, so that the receiving terminal determines, according to the cyclic shift rule, the reference signal sent in the currently transmitted PRB, and estimates, according to a time-frequency two-dimensional interpolation algorithm, link channel state information of all antenna ports in the currently transmitted PRB;
the transmission determining module is used for determining and transmitting the reference signals of the antenna ports transmitted on each physical resource block PRB corresponding to the current reference signal transmission period according to the position of the current reference signal transmission period in the preset cyclic period and the preset cyclic shift rule;
wherein the cyclic period includes a reference signal transmission period that is an integral multiple of the preset number, and the cyclic shift rule includes: and sequentially transmitting the reference signals of the port groups on different PRBs corresponding to the same frequency domain in the cycle period, and sequentially transmitting the reference signals of the port groups on the PRBs corresponding to the same reference signal transmission period.
7. The apparatus of claim 6, wherein the transmission determination module is specifically configured to: and determining a port group to be transmitted of each PRB according to the remainder obtained by dividing the remainder obtained by the preset number by the sum of the number of the PRB and the numerical value identified by the position of the current reference signal transmission period in the preset cycle period.
8. The apparatus of any one of claims 6 to 7, further comprising:
a calculation module, configured to calculate a quotient obtained by dividing the total number of antenna ports by a maximum number of antenna ports used for transmitting a reference signal on each PRB;
and the setting module is used for setting the calculated quotient obtained by carrying out one-way rounding operation as the preset number.
9. The apparatus of claim 6, wherein the reference signal comprises an uplink channel state information reference signal or a downlink channel state information reference signal.
10. A mobile terminal, characterized in that the mobile terminal, as a receiving terminal, comprises:
a receiving module, configured to receive a cyclic shift rule sent by a base station serving as a sending terminal;
a reference signal determining module, configured to determine, according to the cyclic shift rule, a reference signal sent in a PRB currently transmitted by a base station;
the estimation module is used for estimating the downlink channel state information CSI of all antenna ports in the currently transmitted PRB according to a time-frequency two-dimensional interpolation algorithm; wherein the cyclic shift rule is transmitted by a transmitting terminal to a receiving terminal for receiving the reference signal;
the method comprises the steps of sequentially sending reference signals of all port groups on different PRBs corresponding to the same frequency domain in a cycle period, and sequentially sending the reference signals of all the port groups on all the PRBs corresponding to the same reference signal sending period.
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| CN102594516A (en) * | 2011-01-07 | 2012-07-18 | 中兴通讯股份有限公司 | Method and system for processing reference signal of channel state information |
| CN104158574A (en) * | 2009-08-14 | 2014-11-19 | Lg电子株式会社 | Method and apparatus for transmitting downlink reference signal in wireless communication system that supports multiple antennas |
| WO2016010390A1 (en) * | 2014-07-18 | 2016-01-21 | 삼성전자 주식회사 | Synchronization method and device for device-to-device communication in wireless communication system |
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| CN104158574A (en) * | 2009-08-14 | 2014-11-19 | Lg电子株式会社 | Method and apparatus for transmitting downlink reference signal in wireless communication system that supports multiple antennas |
| CN102594516A (en) * | 2011-01-07 | 2012-07-18 | 中兴通讯股份有限公司 | Method and system for processing reference signal of channel state information |
| WO2016010390A1 (en) * | 2014-07-18 | 2016-01-21 | 삼성전자 주식회사 | Synchronization method and device for device-to-device communication in wireless communication system |
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