KR20130126353A - Transmission point, user equipment, signaling method of csi-rs transmission subframe, and indentifying method of csi-rs transmission subframe - Google Patents
Transmission point, user equipment, signaling method of csi-rs transmission subframe, and indentifying method of csi-rs transmission subframe Download PDFInfo
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- KR20130126353A KR20130126353A KR1020120050421A KR20120050421A KR20130126353A KR 20130126353 A KR20130126353 A KR 20130126353A KR 1020120050421 A KR1020120050421 A KR 1020120050421A KR 20120050421 A KR20120050421 A KR 20120050421A KR 20130126353 A KR20130126353 A KR 20130126353A
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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
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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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
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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Abstract
Description
The present invention relates to an apparatus and method for allowing a terminal to receive a reference signal for channel measurement from a plurality of transmission terminals in a CoMP (Coordinated Multi-Point) environment in which the terminal can communicate with a plurality of transmission terminals.
As communications systems evolved, consumers, such as businesses and individuals, used a wide variety of wireless terminals. In a mobile communication system such as the current 3GPP family Long Term Evolution (LTE) and LTE-A (LTE Advanced), a high-speed and large-capacity communication system capable of transmitting and receiving various data such as video and wireless data, , It is required to develop a technology capable of transmitting large-capacity data based on a wired communication network. As one method for transmitting a large amount of data, a method (CoMP (Coordinated Multi-Point)) may be used in which a plurality of transmitters cooperate to communicate with a terminal.
In order to measure the downlink channel so as to efficiently perform the downlink communication, a channel status information reference signal (CSI-RS), which is a reference signal for measuring the downlink channel, may be transmitted from a transmitting end. When the terminal communicates with a plurality of cooperative transmission terminals, it is necessary to measure the downlink channel for each transmission terminal, and thus the terminal should receive the CSI-RS transmitted from the plurality of transmission terminals.
In order to receive the CSI-RS transmitted from the transmitter, the UE receives configuration information on the CSI-RS from the transmitter. The configuration information includes CSI-RS transmission subframe information indicating a subframe in which the CSI-RS is transmitted. However, in some subframes among the CSI-RS transmission subframes, the CSI-RS may not be transmitted to avoid collision with a channel or a signal used for another purpose. In an environment in which a plurality of transmitters cooperate to communicate with the UE, the UE should be able to identify a subframe in which the CSI-RS is not transmitted in order to avoid a collision not only in the transmitter but also in the other transmitter.
An object of the present invention is to provide an apparatus and method for allowing a terminal to receive a reference signal for channel measurement from a plurality of transmission terminals in a CoMP (Coordinated Multi-Point) environment in which the terminal can communicate with a plurality of transmission terminals. It is done.
An embodiment of the present invention is a transmission terminal included in a system in which a single terminal can communicate with a plurality of transmission terminals, and is scheduled to transmit a CSI-RS (Channel Status Information Reference Signal) using a period and an offset. A parameter setting unit for generating a parameter indicating a subframe in which the CSI-RS is actually transmitted among the RS transmission subframes; And a transmitter for transmitting the parameter to the terminal.
Another embodiment of the present invention is a terminal included in a system in which one terminal can communicate with a plurality of transmission terminals, and CSI- scheduled to transmit a Channel Status Information Reference Signal (CSI-RS) using a period and an offset. A parameter receiver configured to receive a parameter indicating a subframe in which the CSI-RS is actually transmitted among RS transmission subframes; And a subframe checking unit for checking a subframe in which the CSI-RS is actually transmitted using the parameter.
Another embodiment of the present invention is a CSI-RS transmission subframe signaling method executed in a transmission terminal included in a system in which one terminal can communicate with a plurality of transmission terminals. Generating a parameter indicating a subframe in which a CSI-RS is actually transmitted among CSI-RS transmission subframes in which a Status Information Reference Signal) is scheduled to be transmitted; And it provides a CSI-RS transmission subframe signaling method comprising the step of transmitting the parameter to the terminal.
Another embodiment of the present invention is a CSI-RS transmission subframe checking method performed in a terminal included in a system in which one terminal can communicate with a plurality of transmission terminals. Receiving a parameter indicating a subframe in which a CSI-RS is actually transmitted among CSI-RS transmission subframes in which information reference signals) are scheduled to be transmitted; And identifying a subframe in which the CSI-RS is actually transmitted using the parameter.
According to the present invention described above, in a CoMP (Coordinated Multi-Point) environment in which a terminal may communicate with a plurality of transmission terminals, the terminal may receive a reference signal for channel measurement from the plurality of transmission terminals.
1 illustrates an example of a wireless communication system in which a terminal communicates with one transmission terminal.
2 illustrates an example of a wireless communication system in which a terminal communicates with a plurality of transmission terminals.
3 is a flowchart illustrating a CSI-RS transmission subframe signaling method according to an embodiment.
4 is an exemplary diagram for describing a bitmap transmitted through higher layer signaling.
5 is a flowchart illustrating a CSI-RS transmission subframe signaling method according to another embodiment.
6 is an exemplary diagram for describing a bit value transmitted through higher layer signaling.
7 is a block diagram illustrating a configuration of a transmission terminal according to an embodiment.
8 is a block diagram illustrating a configuration of a terminal according to an embodiment.
Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
1 illustrates an example of a wireless communication system in which a terminal communicates with one transmitting end (eg, a base station).
Referring to FIG. 1, a wireless communication system includes a user equipment (UE) 10 and a transmission point (TP) 20 that performs uplink and downlink communication with the
In this specification, the
The transmitting
In addition, the
In order to check the downlink channel status, the
Information on the period and offset of the timing (subframe) at which the
I CSI - RS is a value transmitted from the
Even in a subframe configured to transmit the CSI-RS through the higher layer signaling, the CSI-RS may not be transmitted in the next subframe.
A. In the case of a frame structure type (FS) 2, that is, a time division duplex (TDD), the CSI-RS is not transmitted in a special subframe. The special subframe may exist at
B. CSI-RS is not transmitted in case of subframe where CSI-RS transmission collides with Primary Synchronization Signal (PSS) / Secondary Synchronization Signal (SSS), Physical Broadcast CHannel (PBCH), or System Information Block 1 (SIB1) message. Do not.
PSS:
SSS: transmitted in
PBCH: transmitted in
SIB1: SIB1 is a subframe index of the SFN (specific radio frame) when a value obtained by modularly calculating a SFN (which may correspond to an index of a radio frame) to 8 (SFN mod 8) is 0. In # 5, it is transmitted through PDSCH (Physical Downlink Shared CHannel). That is, it may be configured as a period of 80 ms (80 subframes).
C. A CSI-RS is not transmitted in a subframe configured for transmission of a paging message. In the case of FS 1 (FDD), it is transmitted at
The terminal 10 communicating with one transmitting end may know which subframe among the subframes scheduled to transmit the CSI-RS will not be transmitted. That is, the terminal 10 transmits a special subframe, a subframe in which a special subframe, a CSI-RS and a PSS, an SSS, a PBCH, or an SIB1 collide by information transmitted through higher layer signaling or a predefined rule, and a paging message is transmitted. Knowing subframes are known. The terminal 10 may know that the CSI-RS is not transmitted in these subframes.
On the other hand, in order to increase the communication efficiency of the communication network, the terminal receives information from a plurality of transmission terminals at the same time, or a plurality of transmission terminals are controlled by the same scheduler (scheduler) while transmitting information to the same terminal through the cooperative communication The use of coordinated multi-point (CoMP) wireless communication systems is being considered.
2 illustrates an example of a CoMP system in which a terminal communicates with a plurality of transmission terminals.
In the example of FIG. 2, the terminal 10 communicates with a plurality of transmission terminals 20 -A and 20 -B. The CoMP system shown in FIG. 2 is a homogeneous network in which a plurality of transmission terminals 20 -A and 20 -B have the same or similar level of coverage area (for example, a plurality of base stations), or The transmitters 20-A and 20-B may be heterogeneous networks having different levels of coverage area (eg, base station and RRH). The plurality of transmission terminals 20 -A and 20 -B may have the same or different cell IDs.
In the example of FIG. 2, the terminal 10 uses a cell of the transmitting end 20 -A as a serving cell and communicates with the transmitting ends 20 -A and 20 -B. For channel state measurement for downlink communication, the terminal 10 receives the CSI-RS A from the transmitting end 20-A and receives the CSI-RS B from the transmitting end 20-B. The configuration information for the CSI-RS A and the CSI-RS B may be transmitted at the transmitter 20-A or may be transmitted from the transmitter 20-A and the transmitter 20-B, respectively. However, the configuration information for each of the CSI-RS (for example, CSI-RS A, CSI-RS B) is transmitted from the serving cell (for example, the transmitter 20-A) to which the UE belongs. It is common to be. In this case, the configuration information may be transmitted through higher layer signaling such as RRC. Parameters transmitted through higher layer signaling for CSI-RS configuration include information on CSI-RS transmit antenna ports (antennaPortsCount) (2 bits in total) and information on CSI-RS resources (resourceConfig) (5 bits in total). It may include information on the CSI-RS transmission subframe (subframeConfig) (8-bit value in total), information on the CSI-RS transmission power (Pc), and the like. In addition, when generating a sequence for the CSI-RS in a CoMP environment, a virtual cell ID (X) (9-bit total value) that may be used instead of the cell ID may be included in configuration information delivered through higher layer signaling. The transmitter 20-A transmits both information related to the CSI-RS A transmitted from the transmitter 20-A and information related to the CSI-RS B transmitted from the transmitter 20-B through higher layer signaling. I can deliver it.
In this case, since the terminal 10 belongs to the transmission terminal 20 -A, the terminal 10 includes a time point (for TDD) at which a special subframe of the transmission terminal 20 -A is configured, PSS / SSS, PBCH, When the subframe for the transmission of the SIB1 message or the like is configured, and when the subframe for the transmission of the paging message is configured. However, since the terminal 10 does not belong to the transmission terminal 20 -B, the terminal 10 includes a time point at which a special subframe of the transmission terminal 20 -B is configured (for TDD), PSS / SSS, and PBCH. , When the subframe for the transmission of the SIB1 message, etc. is configured, and when the subframe for the transmission of the paging message is configured.
If the setting of the transmitting end 20-A and the setting of the transmitting end 20-B are related, the terminal 10 sets the setting of the transmitting end 20-B from the setting of the transmitting end 20-A. It may be possible to infer. However, even when the setting of the transmitting end 20-A and the setting of the transmitting end 20-B are related, the transmission subframe of the transmitting end 20-A and the subframe of the transmitting end 20-B are related. When this synchronization is not in place, analogy can be difficult.
Accordingly, a method for allowing the terminal 10 to know not only the cell to which it belongs but also a subframe that does not transmit CSI-RS caused by another cell or a transmitting end to which it does not belong may be required.
3 is a flowchart illustrating a CSI-RS transmission subframe signaling method according to an embodiment.
Referring to FIG. 3, the transmitting terminal 20-A to which the terminal 10 belongs transmits a parameter for CSI-RS configuration through higher layer signaling such as RRC (Radio Resource Control) (S310). The parameter for CSI-RS configuration may be set for each of one or more transmission terminals that may communicate with the terminal or may communicate with the terminal, and may be delivered to the terminal. That is, in the example of FIG. 2, the parameters for setting the CSI-RS are the parameters for setting the CSI-RS of the transmitting terminal 20-A to which the terminal belongs and the CSI-RS of the transmitting terminal 20-B to which the terminal does not belong. Contains parameters for configuration.
Parameters for configuring the CSI-RS include the above-described information on the CSI-RS transmission antenna port (antennaPortsCount), information on the CSI-RS resource (resourceConfig), information on the CSI-RS transmission subframe (subframeConfig), CSI-RS Information Pc about transmit power, and a virtual cell ID (X) that can be used for CSI-RS sequence generation.
In addition, the parameter for configuring the CSI-RS indicates a subframe in which the CSI-RS is not transmitted by the CSI-RS or the like by a special subframe, PSS / SSS, PBCH, SIB1, or a paging message among the CSI-RS transmission subframes. It may include a bitmap. The bitmap may be configured with a CSI-RS transmission period (P A ) (5, 10, 20, 40, or 80 subframes) as one bit value, and actually for each CSI-RS transmission period, the CSI-RS May indicate whether the subframe is transmitted or not. The bitmap may have a configuration period of bitmap information of 'P B ' and may be configured of the number of bits of P B / P A.
4 is an exemplary diagram for describing a bitmap transmitted through higher layer signaling.
In the example of FIG. 4, the period P A of the CSI-RS transmission subframe is 40 ms (40 subframes) based on the information (subframeConfig) (I CSI - RS in Table 1) for the CSI-RS transmission subframe. Is determined. On the other hand, the bitmap information construction period (P B ) is assumed to be 320 ms (320 subframes) as a value transmitted or previously set by higher layer signaling. In this case, the bitmap may consist of 8 (= P B / P A ) bits.
Of the eight CSI-RS transmission subframes, the subframe in which the CSI-RS is actually transmitted is 0 and the subframe in which the CSI-RS is not transmitted is 1, or the subframe in which the CSI-RS is transmitted is 1, and the CSI-RS is transmitted. A subframe in which no RS is transmitted may be zero.
In the example of FIG. 4, a second CSI-RS transmission subframe period (CSI-RS transmission period index # 1) and a sixth CSI-RS transmission period (CSI-RS transmission period index) of eight CSI-RS transmission subframe periods. If the CSI-RS transmission subframe belonging to # 5) is a subframe in which CSI-RS is not actually transmitted by a special subframe, PSS / SSS, PBCH, SIB1, paging message, etc., the bitmap consists of '01000100'. Can be.
In a first example, the bitmap information construction period P B may be a predefined value. When the period P A of the CSI-RS transmission subframe is determined based on the information (subframeConfig) for the CSI-RS transmission subframe, the number of bits of the bitmap will be P B / P A. In this example, the number of bits of the bitmap may be changed according to the period P A of the CSI-RS transmission subframe.
For example, the bitmap information construction period P B is 160 ms, 320 ms, 640 ms, 1280 ms, or an exponential multiple of 2 of the CSI-RS transmission period P A (2 i , i is an integer), or It may be one of 2560 ms, but is not limited thereto. In one example, the bitmap information configuration period P B is preset to 320 ms, and the period P A of the CSI-RS transmission subframe is based on the information about the CSI-RS transmission subframe (subframeConfig). When determined to be 40 ms, the bitmap may have a size of 8 (= P B / P A ) bits and indicate whether or not the CSI-RS is actually a subframe for each CSI-RS transmission subframe.
In a second example, the number of bits P B / P A of the bitmap may be a predefined value. When the period P A of the CSI-RS transmission subframe is determined based on the information (subframeConfig) for the CSI-RS transmission subframe, the bitmap information configuration period will be P B. In this example, the bitmap information configuration period may be changed according to the period P A of the CSI-RS transmission subframe.
For example, the number of bits in the bitmap may be one of 2, 4, 8, 16, or 32 as an exponential multiple of 2 (2 i , i is an integer). In one example, when the number of bits of the bitmap is preset to 8 and the period P A of the CSI-RS transmission subframe is determined to be 40 ms based on the information (subframeConfig) for the CSI-RS transmission subframe. The bitmap information configuration period P B may be 320 ms. Thus, for each CSI-RS transmission subframe with a period of 320 ms, it may be indicated whether or not the CSI-RS is a subframe in which the CSI-RS is actually transmitted.
In a third example, information about the number of bits P B / P A of the bitmap may be delivered through higher layer signaling. When the period P A of the CSI-RS transmission subframe is determined based on the information (subframeConfig) for the CSI-RS transmission subframe, the bitmap is based on the number of bits of the bitmap and the period of the CSI-RS transmission subframe. The information composition cycle can be calculated. In this example, the bitmap information configuration period may be changed according to the information about the period P A of the CSI-RS transmission subframe and the number of bits of the bitmap.
For example, the number of bits in a bitmap is a value that is an exponential multiple of 2 (2 i + j ), i is a predetermined value as a natural number of 1 or more, and j is an integer of 0 to k, which is transmitted through higher layer signaling. May be a value. In this case, the number of bits of the bitmap may have a value of 2 i , 2 i + 1 , 2 i + 2 , ..., 2 i + k-1 , or 2 i + k , and the period of constructing the bitmap information (P B ) may have a value of 2 i P A , 2 i + 1 P A , 2 i + 2 P A ,..., 2 i + k-1 P A , or 2 i + k P A. To specify the number of bits (or bitmap information construction period) of the bitmap, the value of j may be delivered through higher layer signaling, and the number of bits for indicating j value may be
Lt; / RTI >For example, when i = 1, k = 3, the bitmap information construction period P B is twice, four times, eight times, or sixteen times the period P A of the CSI-RS transmission subframe. 2 bits are required for information for indicating how many times of these, that is, information for indicating a bitmap information construction period. This 2-bit information can indicate whether or not the CSI-RS is actually a subframe for each CSI-RS transmission subframe within the bitmap information construction period P B. The size of the bitmap may be 2 bits, 4 bits, 8 bits, or 16 bits, and each bit corresponds to one CSI-RS transmission subframe.
For another example, when i = 2, k = 3, the bitmap information construction period P B is four times, eight times, sixteen times, or thirty-two times the period P A of the CSI-RS transmission subframe. 2 bits are required for information for indicating how many times of these, that is, information for indicating a bitmap information construction period. This 2-bit information can indicate whether or not the CSI-RS is actually a subframe for each CSI-RS transmission subframe within the bitmap information construction period P B. The size of the bitmap may be 4 bits, 8 bits, 16 bits, or 32 bits, and each bit corresponds to one CSI-RS transmission subframe.
For another example, when i = 1, k = 7, the bitmap information construction period P B is 2 times, 4 times, 8 times, 16 times the period P A of the CSI-RS transmission subframe. It can be 32 times, 64 times, 128 times, or 256 times, and three bits are required for information indicating how many times of these, that is, information indicating a bitmap information construction period. The 3-bit information can indicate whether or not the CSI-RS is actually a subframe for each CSI-RS transmission subframe within the bitmap information construction period P B. The bitmap may be 2 bits, 4 bits, 8 bits, 16 bits, 32 bits, 64 bits, 128 bits, or 256 bits, and each bit corresponds to one CSI-RS transmission subframe.
Referring back to FIG. 3, the terminal 10 receives a bitmap through higher layer signaling, and then, among the CSI-RS transmission subframes, the subframe and the CSI-RS are actually transmitted among the CSI-RS transmission subframes. The subframe that is not transmitted is checked (S320).
The transmitter 20-A or 20-B may include a subframe for transmitting a special subframe, a PSS / SSS, a PBCH, and a SIB1 message among the configured CSI-RS transmission subframes, and a subframe for transmitting a paging message. Except for actually transmitting the CSI-RS in the subframe in which the CSI-RS is transmitted (S330), the
5 is a flowchart illustrating a CSI-RS transmission subframe signaling method according to another embodiment.
Referring to FIG. 5, the transmitting end 20-A to which the terminal 10 belongs transmits a parameter for configuring CSI-RS through higher layer signaling such as RRC (Radio Resource Control) (S510). The parameter for CSI-RS configuration may be set for each of one or more transmission terminals that may communicate with the terminal or may communicate with the terminal, and may be delivered to the terminal. That is, in the example of FIG. 2, the parameters for setting the CSI-RS are the parameters for setting the CSI-RS of the transmitting terminal 20-A to which the terminal belongs and the CSI-RS of the transmitting terminal 20-B to which the terminal does not belong. Contains parameters for configuration.
Parameters for configuring the CSI-RS include the above-described information on the CSI-RS transmission antenna port (antennaPortsCount), information on the CSI-RS resource (resourceConfig), information on the CSI-RS transmission subframe (subframeConfig), CSI-RS Information Pc about transmit power, and a virtual cell ID (X) that can be used for CSI-RS sequence generation.
Also, the parameter for CSI-RS configuration is one subframe in which the CSI-RS is not transmitted by the CSI-RS due to a special subframe, PSS / SSS, PBCH, SIB1, paging message, etc. among the CSI-RS transmission subframes. It may include a bit value indicating.
The bit value may be a value indicating one subframe that does not actually transmit the CSI-RS among CSI-RS transmission subframes within a specific period P B. The CSI-RS is not transmitted in the subframe designated as the bit value among the CSI-RS transmission subframes within the specific period P B , and the CSI-RS is transmitted in the remaining subframes. When the period of the CSI-RS transmission subframe is P A (for example, 5, 10, 20, 40, or 80 subframes), P B / P A CSI-RS transmissions within a specific period P B There may be a subframe, and the bit value indicates a subframe in which the CSI-RS is not transmitted, and may have a value of 0 to P B / P A -1, and the number of bits for the bit value is
Lt; / RTI >6 is an exemplary diagram for describing a bit value transmitted through higher layer signaling.
In the example of FIG. 6, the period P A of the CSI-RS transmission subframe is 40 ms (40 subframes) based on the information (subframeConfig) (I CSI - RS in Table 1) for the CSI-RS transmission subframe. Is determined. On the other hand, the specific period (P B ) is assumed to be 320 ms (320 subframes) as a value that is transmitted to the upper layer signaling or set in advance. In this case, the bit value may have a value of 000 to 111.
In the example of FIG. 6, a CSI-RS transmission subframe belonging to a sixth CSI-RS transmission subframe period (CSI-RS transmission period index # 5) out of eight CSI-RS transmission subframe periods is a special subframe, PSS / In the case of a subframe in which the CSI-RS is not actually transmitted by the SSS, the PBCH, the SIB1, the paging message, or the like, the bit value may be '101' (5).
The specific period P B may be one of 320 ms (320 subframes), 640 ms (640 subframes), 1280 ms (1280 subframes), or 2560 ms (2560 subframes) equal to the transmission period of the paging message. have. Considering all the subframes for transmission of the special subframe, PSS / SSS, PBCH, and SIB1, these subframes may correspond to
In a first example, the specific period P B is a
For example, the specific period P B is preset in 320 ms (320 subframes), and the period P A of the CSI-RS transmission subframe is set in the information (subframeConfig) for the CSI-RS transmission subframe. When it is determined based on 40 subframes, the bit value has a range of '000' to '111' and can be represented by 3 bits.
In a second example, the specific period P B is indicated via higher layer signaling and is 320 ms (320 subframes), 640 ms (640 subframes), 1280 ms (1280 subframes), or 2560 ms (2560 subframes). ), But is not limited thereto. The transmitting end may transmit a value indicating a specific period P B through higher layer signaling. That is, the transmitting end transmits a value indicating a specific period P B and a value indicating a subframe in which the CSI-RS is not transmitted within the specific period P B through higher layer signaling. When the period P A of the CSI-RS transmission subframe is determined based on the information (subframeConfig) for the CSI-RS transmission subframe, the range of the bit value is 0 to P B / P A −1, and the bit value The number of bits of
. In this example, the range and number of bits of the bit value may be changed according to the value indicating the specific period P B and the period P A of the CSI-RS transmission subframe.For example, which of 320, 640, 1280, or 2560 subframes is designated as a specific period P B may be indicated by a 2-bit value through higher layer signaling. For (P B g., 2-bit value is '00' of the
In a third example, the specific period P B may be determined as a multiple of the CSI-RS transmission subframe period P A. The specific period P B may be an exponent (2 i )
For example, the specific period P B may be fixed to 32 times the CSI-RS transmission subframe period P A. In this case, the bit value indicating the subframe in which the CSI-RS is not transmitted has a range of '00000' to '11111', and the number of bits for indicating the bit value will be 5 bits.
As another example, the specific period P B may be indicated as one of 32 times, 64 times, 128 times, and 256 times the CSI-RS transmission subframe period P A. In this case, a value for indicating how many times the period P B is the CSI-RS transmission subframe period P A may be delivered through higher layer signaling. If the specific period P B is one of 32 times, 64 times, 128 times, and 256 times the CSI-RS transmission subframe period P A , the value for indicating how many times will be 2 bits. When it is determined how many times the specific period P B is the CSI-RS transmission subframe period P A , the bit value indicating the subframe in which the CSI-RS is not transmitted is determined.
Will have the number of bits.On the other hand, there may be a case where there is no subframe that does not actually transmit the CSI-RS within a specific period (P B ) (that is, CSI-RS is transmitted in all CSI-RS transmission subframes within a specific period (P B )). May be the case). In this case, the bit value may be a specific value indicating that there is no subframe that does not actually transmit the CSI-RS. Alternatively, the bit value may not be set and may not be transmitted to the terminal 10.
Referring back to FIG. 5, the terminal 10 receives a bit value through higher layer signaling, and then a subframe in which the CSI-RS is actually transmitted and the CSI-RS are transmitted among the CSI-RS transmission subframes using the bit value. The subframe that is not transmitted is checked (S520).
The transmitter 20-A or 20-B may include a subframe for transmitting a special subframe, a PSS / SSS, a PBCH, and a SIB1 message among the configured CSI-RS transmission subframes, and a subframe for transmitting a paging message. Except for actually transmitting the CSI-RS in the subframe in which the CSI-RS is transmitted (530), the
7 is a block diagram illustrating a configuration of a transmission terminal according to an embodiment.
Referring to FIG. 7, the
The first parameter setting unit 710 generates a first parameter that determines the period and offset of the subframe in which the CSI-RS is to be transmitted. The first parameter may be SubframeConfig of Table 1 and may be an 8-bit value of 0 to 154.
The second parameter setting unit 720 determines a subframe in which the CSI-RS is actually transmitted (or a subframe in which the CSI-RS is not transmitted) among the subframes in which the CSI-RS is transmitted. The CSI-RS may not be transmitted in a special subframe (in case of TDD) among the subframes in which the CSI-RS is to be transmitted and in a subframe in which the PSS / SSS / PBCH / SIB1 / paging message is transmitted.
The second parameter setting unit 720 may include a second parameter including information on a subframe in which the CSI-RS is actually transmitted (or a subframe in which the CSI-RS is not transmitted) among the subframes in which the CSI-RS is transmitted. Create
In one example, the second parameter may be a bitmap. Whether or not the CSI-RS is transmitted in each CSI-RS transmission subframe may be represented by one bit in the bitmap.
The information construction period P B of the bitmap may be a predefined fixed value. The size (bit number) of the bitmap may be determined according to the period P A of the CSI-RS transmission subframe.
Alternatively, the size (number of bits) of the bitmap may be a predefined fixed value. The information configuration period P B of the bitmap may be determined according to the period P A of the CSI-RS transmission subframe.
Alternatively, the size (number of bits) of the bitmap may be a value selected from among a plurality of values. In this case, the second parameter may further include information indicating the size of the bitmap in addition to the bitmap. The information configuration period P B of the bitmap may be determined according to the information indicating the size of the bitmap and the period P A of the CSI-RS transmission subframe.
In another example, the second parameter can be a bit value. When the CSI-RS is not transmitted in one of the CSI-RS transmission subframes within a specific period P B , the bit value may be a value indicating one subframe in which the CSI-RS is not transmitted.
The specific period P B may be a predefined fixed value. The range of bit values may be determined according to the period P A of the CSI-RS transmission subframe.
Alternatively, the specific period P B may be a value selected from a plurality of values. In this case, the second parameter may further include information indicating a specific period P B in addition to the bit value. The range of the bit value may be determined according to the information indicating the specific period P B and the period P A of the CSI-RS transmission subframe.
Alternatively, the range of the bit value (or a multiple indicating how many times the period P A of the CSI-RS transmission subframe is a predetermined period P B ) may be a predefined fixed value. The specific period P B may be determined according to the period P A of the CSI-RS transmission subframe.
Alternatively, the range of the bit value (or a multiple indicating how many times a particular period (P B) the period (P A of a CSI-RS subframe transmission)) may be a value selected from a plurality of values. In this case, the second parameter may further include information indicating a multiple in addition to the bit value. The specific period P B may be determined according to the information indicating the multiple and the period P A of the CSI-RS transmission subframe.
The
The CSI-
8 is a block diagram showing the configuration of a terminal according to an embodiment.
Referring to FIG. 8, the terminal 800 includes a parameter receiver 810, a
The parameter receiver 810 receives a first parameter indicating a period and an offset of a CSI-RS transmission subframe through which the CSI-RS is transmitted through higher layer signaling. In addition, the parameter receiver 810 differs from a second parameter indicating a subframe in which the CSI-RS is actually transmitted (or a subframe in which the CSI-RS is not transmitted) among the CSI-RS transmission subframes indicated by a period and an offset. Receive via layer signaling. The set of the first parameter and the second parameter received by the parameter receiver 810 may be plural, depending on a transmitting end through which the terminal 800 may communicate.
In one example, the second parameter may be a bitmap. Whether or not the CSI-RS is transmitted in each CSI-RS transmission subframe may be represented by one bit in the bitmap.
The information construction period P B of the bitmap may be a predefined fixed value. The size (bit number) of the bitmap may be determined according to the period P A of the CSI-RS transmission subframe.
Alternatively, the size (number of bits) of the bitmap may be a predefined fixed value. The information configuration period P B of the bitmap may be determined according to the period P A of the CSI-RS transmission subframe.
Alternatively, the size (number of bits) of the bitmap may be a value selected from among a plurality of values. In this case, the second parameter may further include information indicating the size of the bitmap in addition to the bitmap. The information configuration period P B of the bitmap may be determined according to the information indicating the size of the bitmap and the period P A of the CSI-RS transmission subframe.
In another example, the second parameter can be a bit value. When the CSI-RS is not transmitted in one of the CSI-RS transmission subframes within a specific period P B , the bit value may be a value indicating one subframe in which the CSI-RS is not transmitted.
The specific period P B may be a predefined fixed value. The range of bit values may be determined according to the period P A of the CSI-RS transmission subframe.
Alternatively, the specific period P B may be a value selected from a plurality of values. In this case, the second parameter may further include information indicating a specific period P B in addition to the bit value. The range of the bit value may be determined according to the information indicating the specific period P B and the period P A of the CSI-RS transmission subframe.
Alternatively, the range of the bit value (or a multiple indicating how many times the period P A of the CSI-RS transmission subframe is a predetermined period P B ) may be a predefined fixed value. The specific period P B may be determined according to the period P A of the CSI-RS transmission subframe.
Alternatively, the range of the bit value (or a multiple indicating how many times a particular period (P B) the period (P A of a CSI-RS subframe transmission)) may be a value selected from a plurality of values. In this case, the second parameter may further include information indicating a multiple in addition to the bit value. The specific period P B may be determined according to the information indicating the multiple and the period P A of the CSI-RS transmission subframe.
The
The CSI-
The
The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.
Claims (28)
A parameter setting unit configured to generate a parameter indicating a subframe in which a CSI-RS is actually transmitted among CSI-RS transmission subframes in which a CSI-RS transmission subframe is scheduled to be transmitted using a period and an offset; And
And a transmitter for transmitting the parameter to the terminal.
And the parameter comprises a bitmap in which one bit is allocated to each CSI-RS transmission subframe.
A period covered by the bitmap is fixed, or a number of bits of the bitmap is fixed.
The parameter further includes information indicating a period covered by the bitmap or the number of bits of the bitmap.
And the parameter is configured with a bit value indicating a subframe in which the CSI-RS is not actually transmitted.
A period covered by the bit value is fixed, or a range of the bit value is fixed.
And the parameter further includes information indicating a period covered by the bit value or a range of the bit value.
A parameter receiver configured to receive a parameter indicating a subframe in which a CSI-RS is actually transmitted among CSI-RS transmission subframes in which a CSI-RS transmission subframe is scheduled to be transmitted using a period and an offset; And
And a subframe checking unit for checking a subframe in which the CSI-RS is actually transmitted using the parameter.
The parameter is a terminal, characterized in that consisting of a bitmap is allocated one bit for each CSI-RS transmission subframe.
And a period covered by the bitmap is fixed, or the number of bits of the bitmap is fixed.
The parameter may further include information indicating a period covered by the bitmap or the number of bits of the bitmap.
The parameter is characterized in that the terminal is configured with a bit value indicating a subframe in which the CSI-RS is not actually transmitted.
And a period covered by the bit value is fixed, or a range of the bit value is fixed.
And the parameter further includes information indicating a period covered by the bit value or a range of the bit value.
Generating a parameter indicating a subframe in which the CSI-RS is actually transmitted among the CSI-RS transmission subframes in which the CSI-RS transmission channel is scheduled to be transmitted using the period and the offset; and
CSI-RS transmission subframe signaling method comprising the step of transmitting the parameter to the terminal.
The parameter is a CSI-RS transmission subframe signaling method, characterized in that consisting of a bitmap is allocated one bit for each CSI-RS transmission subframe.
CSI-RS transmission subframe signaling method characterized in that the period covered by the bitmap is fixed, or the number of bits of the bitmap is fixed.
The parameter may further include information indicating a period covered by the bitmap or the number of bits of the bitmap.
The parameter is a CSI-RS transmission subframe signaling method, characterized in that consisting of a bit value indicating a subframe that is not actually transmitted CSI-RS.
CSI-RS transmission subframe signaling method characterized in that the period covered by the bit value is fixed, or the range of the bit value is fixed.
The parameter may further include information indicating a period covered by the bit value or a range of the bit value.
Receiving a parameter indicating a subframe in which a CSI-RS is actually transmitted among CSI-RS transmission subframes in which a CSI-RS transmission subframe is scheduled to be transmitted using a period and an offset; And
And confirming the subframe in which the CSI-RS is actually transmitted using the parameter.
And wherein the parameter comprises a bitmap in which one bit is allocated to each CSI-RS transmission subframe.
And a period covered by the bitmap is fixed, or the number of bits of the bitmap is fixed.
The parameter further includes information indicating the period covered by the bitmap or the number of bits of the bitmap.
The parameter is a CSI-RS transmission subframe identification method, characterized in that consisting of a bit value indicating a subframe that is not actually transmitted CSI-RS.
And a period covered by the bit value is fixed, or a range of the bit value is fixed.
The parameter further includes information indicating a period covered by the bit value or a range of the bit value.
Priority Applications (2)
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KR1020120050421A KR20130126353A (en) | 2012-05-11 | 2012-05-11 | Transmission point, user equipment, signaling method of csi-rs transmission subframe, and indentifying method of csi-rs transmission subframe |
PCT/KR2013/003978 WO2013168976A1 (en) | 2012-05-11 | 2013-05-07 | Transmission end, terminal, csi-rs transmission subframe signaling method, and csi-rs transmission subframe checking method |
Applications Claiming Priority (1)
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KR1020120050421A KR20130126353A (en) | 2012-05-11 | 2012-05-11 | Transmission point, user equipment, signaling method of csi-rs transmission subframe, and indentifying method of csi-rs transmission subframe |
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KR1020120050421A KR20130126353A (en) | 2012-05-11 | 2012-05-11 | Transmission point, user equipment, signaling method of csi-rs transmission subframe, and indentifying method of csi-rs transmission subframe |
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KR101208549B1 (en) * | 2008-08-05 | 2012-12-05 | 엘지전자 주식회사 | Reference signal transmission method for downlink multiple input multiple output system |
KR101608777B1 (en) * | 2008-10-30 | 2016-04-04 | 엘지전자 주식회사 | Method of dl transmitting reference signal in a wireless communication having multiple antennas |
KR101012391B1 (en) * | 2008-11-11 | 2011-02-09 | 엘지전자 주식회사 | Method for subframe allocation inforamtion to downlink in wireless communication system |
JP5487294B2 (en) * | 2009-03-18 | 2014-05-07 | エレクトロニクス アンド テレコミュニケーションズ リサーチ インスチチュート | System for transmitting a reference signal having channel state information |
KR101790505B1 (en) * | 2010-06-01 | 2017-11-21 | 주식회사 골드피크이노베이션즈 | Apparatus and Method for allocating Channel State Information-Reference Signal dependent on Subframe Configuration in wireless communication |
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2012
- 2012-05-11 KR KR1020120050421A patent/KR20130126353A/en not_active Application Discontinuation
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