KR101526163B1 - Method for Transmitting and Receiving Configuration Information of Interference Measurement Resource, Method for Measuring Interference Measurement Resource, Terminal and Transmission Point thereof - Google Patents

Method for Transmitting and Receiving Configuration Information of Interference Measurement Resource, Method for Measuring Interference Measurement Resource, Terminal and Transmission Point thereof Download PDF

Info

Publication number
KR101526163B1
KR101526163B1 KR1020120144604A KR20120144604A KR101526163B1 KR 101526163 B1 KR101526163 B1 KR 101526163B1 KR 1020120144604 A KR1020120144604 A KR 1020120144604A KR 20120144604 A KR20120144604 A KR 20120144604A KR 101526163 B1 KR101526163 B1 KR 101526163B1
Authority
KR
South Korea
Prior art keywords
allocation information
interference signal
signal measurement
resource allocation
measurement resource
Prior art date
Application number
KR1020120144604A
Other languages
Korean (ko)
Other versions
KR20140032854A (en
Inventor
강승현
Original Assignee
주식회사 케이티
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR1020120099237 priority Critical
Priority to KR20120099237 priority
Priority to KR1020120116939 priority
Priority to KR20120116939 priority
Application filed by 주식회사 케이티 filed Critical 주식회사 케이티
Priority claimed from US14/017,458 external-priority patent/US9137810B2/en
Publication of KR20140032854A publication Critical patent/KR20140032854A/en
Application granted granted Critical
Publication of KR101526163B1 publication Critical patent/KR101526163B1/en

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J11/00Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023Interference mitigation or co-ordination
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/30Monitoring; Testing of propagation channels
    • H04B17/309Measuring or estimating channel quality parameters
    • H04B17/345Interference values
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035Resource allocation in a cooperative multipoint environment
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation
    • H04W72/0406Wireless resource allocation involving control information exchange between nodes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources

Abstract

The present invention relates to a method for transmitting allocation information of an interference signal measurement resource and a method for measuring an interference signal in a downlink CoMP environment.

Description

[0001] The present invention relates to an interference signal measurement resource allocation information transmission method and an interference signal measurement method, a transmission point, a terminal, and a transmission /

The present invention relates to a method and apparatus for transmitting or receiving interference signal measurement resource allocation information and allocation information for allocating interference signal measurement resources to be transmitted for channel state information measurement in a downlink CoMP state.

In a coordinated multi-point transmission / reception system (CoMP system) in which two or more different transmission points cooperate to transmit a signal, an interference signal measurement resource allocated for channel state information measurement It is necessary to transmit the signal measurement resource allocation information to the terminal and measure the interference signal to feedback the channel status information.

According to an aspect of the present invention, there is provided an interference cancellation method, comprising: constructing interference signal measurement resource allocation information used for a downlink interference signal measurement of a specific terminal; And transmitting the interference signal measurement resource allocation information distinguished by using the interference signal measurement resource index indicating the interference signal measurement resource allocation information to the terminal.

According to another aspect of the present invention, there is provided a method for measuring a downlink interference signal, comprising: receiving, from a transmission point, the interference signal measurement resource allocation information distinguished using an interference signal measurement resource index indicating interference signal measurement resource allocation information And measuring an interference signal according to the interference signal measurement resource allocation information.

According to still another aspect of the present invention, there is provided a method for measuring a downlink interference signal of a specific terminal, the method comprising: a controller configuring the interference signal measurement resource allocation information used for measuring a downlink interference signal of a specific terminal; And a transmitter for transmitting the signal measurement resource allocation information to the terminal.

According to another aspect of the present invention, the interference signal measurement resource allocation information discriminated using the interference signal measurement resource index indicating the interference signal measurement resource allocation information used for the downlink interference signal measurement of a specific terminal is received from the transmission point And a controller for measuring the interference signal according to the interference signal measurement resource allocation information.

1 shows an example of a wireless communication system to which embodiments are applied.
FIG. 2 illustrates a CSI - RS - Config Information elements of the message.
FIG. 3 shows locations of resource elements used for CSI-RS and ZP-CSI-RS transmission within one PRB pair.
4 is a flowchart illustrating a method of transmitting an interference signal measurement resource allocation information of a transmission point according to an exemplary embodiment of the present invention.
FIG. 5 illustrates an IMR index of the interference signal measurement resource allocation information according to the first embodiment.
FIG. 6 illustrates interference signal measurement resource allocation information of a transmission point according to the second embodiment.
7 shows how the IMR bitmap of the IMRConfigList field added for IMR allocation according to the third embodiment is constructed.
8 illustrates an IMR index of the interference signal measurement resource allocation information according to the fourth embodiment.
FIG. 9 shows a method of configuring T bits (T is a natural number of 1 or more) bitmap of zeroTxPowerSub-frameConfigList-r1x according to the fifth embodiment.
10 shows a method of configuring a T bit bitmap of zeroTxPowerSub-frameConfigList-r1x according to the fifth embodiment.
11 is a flowchart of a method of measuring an interference signal of a UE according to another embodiment of the present invention.
FIG. 12 is a diagram illustrating a configuration of a base station according to another embodiment.
13 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals 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.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a transmission / reception point. The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station (BS) or a cell, a Node-B, an evolved Node-B (eNB), a sector (Sector) ), A site, a base transceiver system (BTS), an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and an antenna.

That is, in the present specification, a transmission / reception point or a base station and a cell are comprehensive (eg, a base station controller) in a CDMA base station controller, a WCDMA NodeB, an eNB in a LTE or a sector It is meant to encompass various coverage areas such as megacels, macrocells, microcells, picocells, femtocells and relay nodes, remote radio heads (RRH), and radio range (RU) to be.

In this specification, a user terminal and a transmission / reception point are used in a generic sense as two transmitting and receiving subjects used to implement the technical or technical idea described in the present specification, and are not limited by a specific term or word. The user terminal and the transmission / reception point are used in a broad sense as two (uplink or downlink) transmission / reception subjects used to implement the technical or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In a system such as LTE and LTE-A, the uplink and downlink are configured based on one carrier or carrier pair to form a standard. The uplink and downlink transmit control information through a control channel such as a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel (PHICH), and a Physical Uplink Control CHannel And a data channel such as a Physical Downlink Shared CHannel (PDSCH), a Physical Uplink Shared CHannel (PUSCH), and the like. In this specification, the PDCCH is a concept including an ePDCCH.

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself . Herein, the transmission / reception point means a transmission point for transmitting / transmitting a signal or a reception point for receiving a signal or a transmission / reception point thereof. Accordingly, in the present specification, a subject that transmits / transmits a signal is referred to as a transmission / reception point or a transmission point, and a subject that receives a signal is referred to as a transmission / reception point or a reception point.

1 shows an example of a wireless communication system to which embodiments are applied.

Referring to FIG. 1, a wireless communication system 100 to which embodiments are applied includes a coordinated multi-point transmission / reception system (CoMP system) in which two or more transmission / reception points cooperatively transmit signals, A coordinated multi-antenna transmission system, and a cooperative multi-cell communication system. CoMP system 100 may include at least two or three transmission points 110,112, 114 and terminals 120,122.

The transmission points 110, 112 and 114 are connected to a base station or macro cell 110 (hereinafter referred to as 'eNB') and an eNB 110 through optical fibers or optical fibers, Or at least one pico cell (112 or 114, hereinafter referred to as RRH) having a low transmit power in a macro cell region. The eNB 110 and the RRHs 112 and 114 may have the same cell ID or different cell IDs.

Hereinafter, a downlink refers to a communication or communication path from the transmission point 110 or 112 to the terminal 120 and an uplink from the terminal 120 to the transmission point 110, 112 or 114 Quot; communication " or " communication path " In the downlink, the transmitter may be part of the transmission point 110, 112, 114, and the receiver may be part of the terminal 120, 122. In the uplink, the transmitter may be part of the terminal 120, and the receiver may be part of the transmission point 110, 112, 114.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH and PDSCH are transmitted and received'.

The transmission points 110, 112, and 114 perform downlink transmission to the UEs. The transmission points 110, 112, and 114 transmit downlink control information such as a physical downlink shared channel (PDSCH), which is a primary physical channel for unicast transmission, and scheduling, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission of an uplink data channel (for example, a physical uplink shared channel (PUSCH)) can be transmitted . Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

At this time, as described below with reference to the drawings, in the downlink CoMP situation, the transmission points -A and B 110 and 112 transmit the downlink signal to the first terminal 120 and the transmission points -A to C , 114 may transmit a downlink signal to the second terminal 122. [ The first terminal 120 may transmit the uplink signal to the receiving point-A 110 and the second terminal 122 may transmit the uplink signal to the receiving point-C 114 in the uplink CoMP state. At this time, it is assumed that the transmission point-A is a serving transmission point of the terminals 120 and 122 in the wireless communication system 110 shown in FIG.

1, the interference hypothesis (downlink CoMP measurement set and interference hypothesis) for calculating the interference item of the downlink CoMP measurement set and the SINR will be described below.

One UE has a unique CoMP measurement set. The CoMP measurement set is composed of one or more transmission points (TP) capable of transmitting downlink data to the UE. For example, the first terminal 120 may have a CoMP measurement set consisting of transmission points-A and B 110 and 112 and the second terminal 122 may be configured with transmission points-A through C (110, 112, 114) You can have a CoMP measurement set.

Assuming that each transmission point included in the CoMP measurement set is a serving transmission point transmitting a downlink signal to the UE, the UE may perform various CoMP (Single point transmission, Dynamic point selection (DPS) or Dynamic point blanking (CSI) feedback based on the channel status information / indication (CSI).

A terminal transmits two transmission points (transmission point-A 110 and transmission point-B 112) or three transmission points (transmission point-A 110 and transmission point-B 112) according to a serving transmission point and a CoMP method, For the CoMP measurement sets consisting of A (TP-A, 110), Transmission Point-B (TP-B, 112), Transmission Point-C .

Figure 112012103440931-pat00001

Figure 112012103440931-pat00002

S A , S B and S C represent the signal powers transmitted by the transmission point-A, transmission point-B and transmission point C, respectively, and I A and I B And I C represent the interference power transmitted from the transmission point-A, transmission point-B, and transmission point-C, respectively. In addition, I O represents the interference power transmitted from the transmission point is not included in the CoMP measurement set, N represents the background noise (background noise).

In order to calculate the various SINR values, the UE first receives the CSI-RS from all the transmission points existing in the CoMP measurement set, and calculates the signal power value of the corresponding transmission point.

In addition, the terminal must calculate the interference item of the SINR. To do this, the denominator of the SINR equation is first organized according to the interference hypothesis as shown in Table 3 below (when the CoMP measurement set is composed of two transmission points) and 4 (when the CoMP measurement set is composed of three transmission points) . The UE allocates an interference measurement resource (IMR) for each interference hypothesis, measures the signal power received through the corresponding IMR, and uses this value as an interference item of the SINR.

Figure 112012103440931-pat00003

Figure 112012103440931-pat00004

If one IMR is allocated for one interference hypothesis, the transmission points included in the CoMP measurement set may transmit the downlink signal to be received by the interference to the terminal in accordance with the interference hypothesis, as described in Tables 3 and 4, And does not transmit the downlink signal by muting the corresponding IMR so as not to occur.

The interference hypothesis for calculating the interference items of the downlink CoMP measurement set and the SINR has been described. Hereinafter, the CSI-RS allocation information transmission method will be described.

The serving transmission point 110 transmits the CSI - RS - Config message from the already defined RRC message (3GPP TS 36.331 V10.5 standard document) as shown in FIG. 2 Message to the UE, and transmits the CSI-RS allocation information to the UE.

At this time, CSI - RS - Config The definition of each field in the message is shown in Table 5.

Figure 112012103440931-pat00005

At this time, CSI - RS - Config (CSI-RS allocation information) to the CSI-RS of the serving transmission point is transmitted to the CSI-RS-r10 IE (Information Element) of the message. The zeroTxPowerCSI-RS-r10IE transmits information (muting information) about resource element muting that the serving transmission point does not transmit the downlink signal. If another transmission point uses the same resource element as the mutated resource element for CSI-RS transmission, the downlink signal of the serving transmission point does not interfere with the CSI-RS of another transmission point. Resource element The resource element used for muting is called ZP-CSI-RS.

FIG. 3 shows locations of resource elements used for CSI-RS and ZP-CSI-RS transmission within one PRB pair.

Referring to FIG. 3, in order to transmit one CSI-RS in one PRB pair composed of two slots, the same number of resources (2, 4, or 8) as the number of transmit antenna ports Element. In FIG. 3, the capital letters A to R indicate the positions of 2, 4, or 8 resource elements that are defined in advance to transmit one CSI-RS, respectively.

On the other hand, in order to transmit one ZP-CSI-RS within one PRB pair, four resource elements are always used irrespective of the number of transmit antenna ports.

RS and ZP-CSI-RS are transmitted only for a resource element position corresponding to FIG. 3 (a) when the frame structure is FDD, and FIG. 3 (a) and FIG. 3 RS and ZP-CSI-RS only for the resource element location corresponding to the location of the resource element.

The allocation information of the CSI-RS and the ZP-CSI-RS includes an RRC message ( CSI - RS - Config ) containing two types of information, a resource configuration and a subframe configuration Message) to the terminal.

The resource allocation information is configured in a bitmap format, and one bit position in the bitmap indicates a resource element position corresponding to one alphabet in FIG. The subframe allocation information informs the UE of the transmission period and the offset value in which the CSI-RS or the ZP-CSI-RS is transmitted in units of subframes using Table 6 below.

Figure 112012103440931-pat00006

In this case, in order to allocate the conventional CSI-RS, control information (for example, CSI - RS - Config Message) is not suitable for transmitting more than one CSI-RS and IMR allocation information to one terminal in the downlink CoMP situation.

Hereinafter, the method of transmitting the CRI-RS allocation information will be described. Hereinafter, the IMR allocation information using the ZP-CSI-RS allocation method and the method of transmitting the IMR resource allocation information will be described.

4 is a flowchart illustrating a method of transmitting an interference signal measurement resource allocation information of a transmission point according to an exemplary embodiment of the present invention.

4, a method 400 for transmitting an interference signal measurement resource allocation information of a transmission point according to an exemplary embodiment of the present invention includes an interference signal measurement resource allocation information (S410), and distinguishing each of the interference signal measurement resource allocation information using the interference signal measurement resource index and transmitting the interference signal measurement resource allocation information to the terminal (S420). More specifically, the serving transmission point identifies the allocated plurality of interference signal measurement resources using the interference signal measurement resource index, and when the serving transmission point requests CSI feedback to the terminal, it uses the interference signal measurement resource index The interference signal measurement resource allocation information (IMR allocation information) includes resource allocation information and subframe allocation information.

One Interference Measurement Resource (IMR) is composed of four resource elements in one PRB pair, like the ZP-CSI-RS. Like the ZP-CSI-RS, the transmission point transmits the IMR allocation information to the UE using the resource allocation information and the subframe allocation information.

Meanwhile, in step S420 of transmitting the interference signal measurement resource allocation information to the terminal, CSI-RS allocation information may be transmitted together with the IMR allocation information.

Hereinafter, in the downlink CoMP situation, the IMR allocation information for the IMR (Interference Measurement Resource) transmitted for the CSI measurement is distinguished / separated using the IMR index, the IMR allocation information is transmitted to the terminal, and the IMR Embodiments of the assignment information transmission method will be described in detail.

[Embodiment 1] Reuse of CSI - RS - Config message

The CSI-RS allocation information and the IMR allocation information for measuring the signal power of the transmission point are transmitted from the serving transmission point 110 transmitting the downlink signal to the terminal 120 or 122. Therefore, the serving transmission point 110 transmits the CSI-RS allocation information and the IMR allocation information required for each transmission point transmitted by all the transmission points in the CoMP measurement set to the CSI - RS - Config Message to the corresponding terminal 120 or 122 using the message.

The UE 120 or 122 receives CSI-RS allocation information transmitted by all the transmission points in the CoMP measurement set. Therefore, the serving transmission point 110 uses ZP-CSI-RS allocation information for resource element muting, which is used to suppress interference generated between the CSI-RS and the downlink signal between transmission points in the CoMP measurement set, to zeroTxPowerCSI-RS -r10 No need to explicitly send using IE.

In the first embodiment, the serving transmission point 110 CSI - RS - Config And transmits the CSI-RS allocation information and the IMR allocation information configured for each transmission point to the terminal 120 or 122 at the same time. First, the CSI-RS-r10 IE transmits the CSI-RS allocation information of the transmission point and the zeroTxPowerCSI-RS-r10 IE simultaneously transmits the IMR allocation information. In this case, the interference hypothesis that the transmission signal of the transmission point transmitting the CSI-RS acts as interference is not allocated to the IMR in the IMR allocation information.

For example, when transmitting the CSI-RS allocation information for the transmission point-A 110 to the CSI-RS-r10 IE, the zeroTxPowerCSI-RS-r10 IE includes the interference hypothesis I A included in Table 4 The IMR allocation information is transmitted only for the remaining interference hypotheses except hypothesis (for example, I A + I B + I O + N, I A + I B + I O + N, I A + I O + N).

When the IMR is allocated to each of the transmission points to which CSI-RSs are to be transmitted, the terminal 120 or 122 allocates an SINR value to each transmission point according to the interference hypothesis required for each transmission point without an instruction from the serving transmission point 110 Can be calculated.

The IMR allocated simultaneously through the zeroTxPowerCSI-RS-r10 IE is divided into a 16-bit bitmap (BIT STRING (SIZE (16)) of the zeroTxPowerResourceConfigList-r10 field. When the bitmap is set to '1' 5, the bitmap of the zeroTxPowerResourceConfigList-r10 field is "1000001010010000 ". In this case, the index of the ZP-CSI- The IMR-assigned ZP-CSI-RS indexes 0, 6, 8 and 11 may be IMR indexes 0 to 3, assuming 0, 6, 8 and 11 as shown in FIG.

In addition, the terminals 120 and 122 can distinguish / distinguish the respective IMRs by arranging only the part in which the bitmap is set to '1' as shown in FIG. 5, and attaching the IMR indexes in the order of bitmaps. Using the IMR index thus determined, the serving transmission point 110 may request the CSI feedback for the preferred interference hypothesis to the terminals 120 and 122.

[Embodiment 2] When allocation information is transmitted independently for each IMR

1 and 4, CSI-RS allocation information and IMR allocation information for measuring a signal power of a transmission point are transmitted from a serving transmission point 110, which transmits a downlink signal to a current terminal, (120 or 122). At this time, the IMR allocation information can be transmitted independently for each IMR. For example, as shown in FIG. 6, N resource allocation information (zeroTxPowerResourceConfigList-r1x in FIG. 6) independent of each IMR and N sub-frame allocation information (ZeroTxPowerSubframefig-r1x in Fig. 6). In other words, the terminal 120 or 122 may be configured with one or more IMR allocation information. In this case, the parameters that can be configured through the upper layer signaling for the IMR allocation information are ZP-CSI-RS configuration and Zero-power CSI-RS subframe configuration. Lt; / RTI >

Since the ZP-CSI-RS allocation information (zeroTxPowerCSI-RS-r1x) contains one IMR allocation information, the IMR index can be allocated in the order in which the IMR allocation information is transmitted.

Alternatively, when a plurality of resource allocation information and a subframe allocation are used, and one IMR allocation information is used for a plurality of IMRs using the same subframe allocation as in the first embodiment, the order in which the IMR allocation information is transmitted, The IMR index can be assigned by mixing the bitmap sequences used for allocation. First, the IMR index is increased in the order that the IMR allocation information is transmitted, and the IMR index is increased in the bitmap order used for resource allocation as in the [Embodiment 1] for the IMR allocation information for transmitting a plurality of IMRs. Allocate an index.

Alternatively, if the transmission order of the IMR allocation information is ambiguous, the values of the subframe allocations of all allocated IMRs may be sorted in ascending or descending order, and the IMR indexes may be allocated in the order of the subframe allocation values. If there is an IMR having the same subframe allocation value, the IMR index is incremented in the bitmap order used for resource allocation as in [Embodiment 1], and an IMR index is allocated to each IMR.

Using the IMR index thus determined, the serving transmission point 110 may request the terminal 120 or 122 for CSI feedback on the preferred interference hypothesis.

[Embodiment 3] A separate IE for assigning IMR to the CSI - RS - Config message is added

If resource element muting is used to suppress the interference caused by the transmission points in the CoMP measurement set for the CSI-RS transmission of the transmission point not included in the CoMP measurement set, ZP-CSI-RS allocation information for resource element muting Is transmitted using the zeroTxPowerResourceConfigList field of the zeroTxPowerCSI-RS IE as in the conventional case. In this case, in the third embodiment of the present invention, the CSI - RS - Config And an IMRConfigList field for assigning IMR allocation information to the zeroTxPowerCSI-RS IE of the message.

7 shows how the IMR bitmap of the IMRConfigList field added for IMR allocation according to the third embodiment is constructed.

Referring to FIG. 7, ZP-CSI-RS resource allocation information for resource element muting is transmitted as a bitmap of the zeroTxPowerResourceConfigList field. If the number of ZP-CSI-RS allocated as resource element muting is N, the IMRConfigList field is composed of (16-N) bit bitmaps. In other words, except for the ZP-CSI-RS resources allocated for resource element muting, the remaining ZP-CSI-RS resources are used to allocate the IMR.

The ZP-CSI-RS resource set to '0' in the bitmap for resource element muting is collected and used as a resource for allocating the IMR and reconstructed into an IMR bitmap. For example, assume that the index of ZP-CSI-RS used for resource element muting in FIG. 8 is 0, 6, 8, and 11 as shown in FIG. 12 ZP-CSI-RS resources excluding the four ZP-CSI-RS resources are used for IMR allocation and are reconstructed into 12-bit ((16-4) bits) IMR bitmaps. And sets the IMR allocated ZP-CSI-RS resource to '1' in the reconstructed IMR bitmap. For example, the ZP-CSI-RS index to which the IMR is assigned may be 2, 4, 9, and 14.

In addition, the UE may sort the ZP-CSI-RS with the IMR bitmap set to '1' as shown in FIG. 8, and then index each of the IMRs in the order of the bitmap. For example, the ZP-CSI-RS indexes 2, 4, 9 and 14 to which the IMR is assigned may be IMR indexes 0 to 3.

Using the IMR index thus determined, the serving transmission point 110 may request the terminal for CSI feedback on the preferred interference hypothesis.

[Embodiment 4] A method of allocating IMRs to a plurality of sub-frames

The CSI - RS - Config In a method of allocating an IMR using a message, an IMR set to be considered according to a transmission point is determined and the allocation information of the IMR set can be transmitted to each transmission point.

At this time, the subframe allocation information for the subframe in which the IMR exists uses the zeroTxPowerSubframeConfig-r10 field. Therefore, one CSI - RS - Config Only one subframe can be allocated to a message. In this case, the maximum number of IMR resources that can be allocated to one subframe is 16 (alphabetical uppercase letters A to R in Fig. 3) as shown in Fig.

However, as the number of transmission points included in the CoMP measurement set increases, the number of interference hypotheses to be considered increases accordingly. When the number of transmission points in a CoMP measurement set is N TP , the number of all interference hypotheses to be considered N IH is

Figure 112012103440931-pat00007
to be. Table 7 below shows the number of N IHs according to the number of N TPs .

Figure 112012103440931-pat00008

If the IMR is allocated considering a large number of interference hypotheses (N IH ), or if there are a large number of resources used for CSI-RS transmission and resource element muting in one subframe, there may be insufficient resources to allocate IMR . Therefore, the method of allocating the IMRs divided into several subframes will be described in detail in Embodiments 5 and 6.

[Embodiment 5] A method of allocating IMRs divided into a plurality of subframes

In order to select a plurality of subframes, the value of zeroTxPowerResourceConfigList used for allocating subframes of the ZP-CSI-RS may be used. Using the value of zeroTxPowerResourceConfigList, it is possible to obtain the start index of the subframe in which the ZP-CSI-RS is transmitted and the ZP-CSI-RS transmission period as the number of subframes. T denotes the number of subframes of the obtained transmission period.

All subframes within one transmission period can be used as subframes capable of IMR transmission. Alternatively, in order to reduce the signaling overhead, a subframe capable of IMR transmission can be selected in advance and the subframe allocation information can be transmitted to the terminal.

Here, the number S of subframes selected for transmission of the IMR may be a predefined value of a natural number equal to or greater than 1, or may provide the terminal with information on the S value variably defined by the system in an RRC message.

At this time, the S subframes may use a subframe having S consecutive subframe indexes starting from an index separated by an offset value O from the start index of the subframe period. Here, the offset value O may be any integer. For example, for the T = 10, S = 5, O = 1 and the start index i of the subframe period, the five subframe indexes available for IMR transmission are {i + 1, i + 2, i + 4, i + 5}.

Or S subframes may be subframes having S subframe indices selected starting at an index that is offset by an offset value O from the start index of the subframe period and spaced by? At this time, Δ can be defined as a function of T and S. For example, let T = 10, S = 3, O = 1 and the start index i of the subframe period. If it is defined as Δ = floor (T / S), Δ = 3 and three sub-

The lame indices are {i + 1, i + 4, i + 7}.

The index of the subframe in which the IMR transmission is possible can be expressed by Equation 1 as follows.

[Equation 1]

i + (O +? * s) mod T

In Equation (1), s = 0, 1, ... , Ceil (T /?) - 1.

In addition, even if information on the value of? Is given without information on the S value, if only the T and O values are known, a subframe capable of transmitting the IMR can be selected. Therefore, Δ that can be used in place of the S value may be a predefined value, or the system may provide information on the number of T values variably defined in the system to the UE in the RRC message.

The index of the subframe in which the IMR transmission is possible can be expressed by the following equation (2).

&Quot; (2) "

i + (O +? * s) mod T

In Equation (2), s = 0, 1, ... , Ceil (T /?) - 1. At this time, Ceil means upward. For example, Ceil (0.1) = 1.

Alternatively, a subframe in which an IMR can be transmitted among T subframes of a transmission period can transmit a separate IMR bitmap to the terminal by configuring an RRC message. In FIG. 9, zeroTxPowerSub-frameConfigList-r1x represents the T bit (T is a natural number greater than or equal to 1) bitmap, and transmits the bitmap for the selected S subframes as '1' and the remaining bitmap as '0' .

The IMR bitmap containing the IMR allocation information for each subframe is configured in the RRC message by the number of subframes S to which the IMR is allocated, and the IMR bitmap formed for each subframe is the same as that of Embodiments 1 to 3 Follow.

Also, the IMR index can be distinguished from the IMR index in the order of the subframe to which the IMR is allocated and the IMR bitmap to which the IMR is allocated within one cycle of the ZP-CSI-RS or the CSI-RS, have. Using the IMR index thus determined, the serving transmission point 110 may request the terminal for CSI feedback on the preferred interference hypothesis.

[Embodiment 6] A method of allocating IMRs divided into a plurality of subframes

It is possible to use the value of the subframeConfig used as the subframe allocation information used for the transmission of the CSI-RS instead of the zeroTxPowerResourceConfigList used in the fifth embodiment. Using the values 0 to 154 of the subframeConfig, it is possible to obtain the start index and the CSI-RS transmission period of the subframe in which the CSI-RS is transmitted as the number of subframes. Also, the obtained CSI-RS transmission period is used as a T value for the IMR transmission. The method for transmitting the IMR allocation information may be the same as the fifth embodiment.

At this time, all the subframes within one transmission period can be used as subframes capable of IMR transmission. Alternatively, in order to reduce the signaling overhead, a subframe capable of IMR transmission can be selected in advance and the subframe allocation information can be transmitted to the terminal.

Here, the number of subframes S selected for the IMR transmission may be a predefined value, or the system may provide the terminal with information on S values variably defined by the RRC message.

At this time, the S subframes may use a subframe having S consecutive subframe indexes starting from an index separated by an offset value O from the start index of the subframe period. Here, the offset value O may be any integer. For example, for the T = 10, S = 5, O = 1 and the start index i of the subframe period, the five subframe indexes available for IMR transmission are {i + 1, i + 2, i + 4, i + 5}.

Alternatively, the S subframes may use a subframe having S subframe indices starting at an index apart from the start index of the subframe period by an offset value O and being spaced by? At this time, Δ can be defined as a function of T and S. For example, let T = 10, S = 3, O = 1 and the start index i of the subframe period. If it is defined as Δ = floor (T / S), then Δ = 3, and the three subframe indices for which IMR transmission is possible are {i + 1, i + 4, i + 7}.

The index of a subframe capable of MR transmission can be expressed by Equation (3) as follows.

&Quot; (3) "

i + (O +? * s) mod T

In Equation (3), s = 0, 1, ... , S-1.

In addition, even if information on the value of? Is given without information on the S value, if only the T and O values are known, a subframe capable of transmitting the IMR can be selected. Therefore, Δ that can be used in place of the S value may be a predefined value, or the system may provide information on the number of T values variably defined in the system to the UE in the RRC message.

The index of the subframe in which the IMR transmission is possible can be expressed by Equation (4) as follows.

&Quot; (4) "

i + (O +? * s) mod T

In Equation (4), s = 0, 1, ... , Ceil (T /?) - 1.

Alternatively, a subframe in which an IMR can be transmitted among T subframes of a transmission period can transmit a separate IMR bitmap to the terminal by configuring an RRC message. Here, the zeroTxPowerSubframeConfig field used for allocating the subframe of the ZP-CSI-RS in the conventional technique or the embodiment 5 can be removed. The RRC message may be configured as shown in FIG. In FIG. 10, zeroTxPowerSub-frameConfigList-r1x represents the T bit bit map, and transmits the bit map for the selected S subframes as '1' and the remaining bit map as '0'.

The IMR bitmap containing the IMR allocation information for each subframe is configured in the RRC message by the number of subframes S to which the IMR is allocated, and the IMR bitmap formed for each subframe is the same as that of the first to third embodiments .

Also, the IMR index can be distinguished from the IMR index in the order of the subframe to which the IMR is allocated and the IMR bitmap to which the IMR is allocated within one cycle of the ZP-CSI-RS or the CSI-RS, have. Using the IMR index thus determined, the serving transmission point 110 may request the UE for CSI feedback on the preferred interference hypothesis.

Embodiments of the IMR allocation information transmission method for transmitting IMR allocation information to the UE using the IMR allocation information and the IMR index for the IMR in the abnormal downlink CoMP have been described in detail. The interference signal measurement method will be described in detail. Other embodiments are equally applicable.

11 is a flowchart of a method of measuring an interference signal of a UE according to another embodiment of the present invention.

11, an interference signal measurement method 1100 of a UE according to another embodiment of the present invention includes an interference signal measurement resource (IMR) index indicating an interference signal measurement resource allocation information used for measuring a downlink interference signal of a specific terminal (S1110) of receiving the interference signal measurement resource allocation information separated from the transmission point using the interference signal measurement resource allocation information (S11200) and measuring the interference signal according to the interference signal measurement resource allocation information (S11200).

The interference signal measurement resource allocation information includes a resource configuration and a subframe configuration.

The resource allocation information is composed of four resource elements in one physical resource block. The four resource elements can be configured with a ZP-CSI-RS allocation.

In step S1120, the interference signal measurement resource allocation information is received from the transmission point through the terminal-specific RRC message.

In the step S1120 of receiving the interference signal measurement resource allocation information from the transmission point, the CSI-RS allocation information may be received together with the interference signal measurement resource allocation information.

On the other hand, the UE receiving the interference signal measurement resource allocation information from the transmission point using the IMR index distinguishes the IMR allocation information by attaching the IMR index as described in the first to sixth embodiments, and using the IMR index, And measures the interference signal according to the hypothesis and feeds back the channel state information to the transmission point.

FIG. 12 is a diagram illustrating a configuration of a base station according to another embodiment.

12, a base station 1200 according to another embodiment includes a control unit 1210, a transmission unit 1220, and a reception unit 1230.

The controller 1210 controls the overall operation of the base station according to the CoMP operation required to perform the above-described present invention.

The transmitting unit 1220 and the receiving unit 1230 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

The base station 1200 described with reference to FIG. 12 performs all the interference signal resource transmission methods of the transmission points according to the first to sixth embodiments of the present invention through the control unit 1210, the transmission unit 1220, and the reception unit 1230 .

The controller 1210 configures the interference signal measurement resource allocation information used for the downlink interference signal measurement of the specific terminal. At this time, the transmitter 1220 identifies the interference signal measurement resource allocation information using the interference signal measurement resource index indicating the interference signal measurement resource allocation information, and transmits the interference signal measurement resource allocation information to the terminal. The transmitter 1120 may transmit the interference signal measurement resource allocation information to the terminal through the terminal-specific RRC message. The transmitting unit 1120 can transmit the CSI-RS allocation information together with the interference signal measurement resource allocation information.

13 is a diagram illustrating a configuration of a user terminal according to another embodiment of the present invention.

13, a user terminal 1300 according to another embodiment includes a receiving unit 1310, a control unit 1320, and a transmitting unit 1330.

The receiver 1310 receives downlink control information, data, and messages from the base station through the corresponding channel.

Also, the controller 1320 controls the overall operation of the base station according to the CoMP operation required to perform the above-described present invention.

The transmission unit 1330 transmits downlink control information, data, and a message to the base station through the corresponding channel.

The terminal 1300 described with reference to FIG. 13 can perform all of the interference signal measurement methods of the terminal through the receiving unit 1310, the control unit 1320, and the transmitting unit 1330 through Embodiments 1 through 6 of the present invention .

The receiving unit 1310 may receive the interference signal measurement resource allocation information distinguished from the transmission point by using the interference signal measurement resource index indicating the interference signal measurement resource allocation information used for the measurement of the downlink interference signal of the specific terminal. Meanwhile, the controller 1320 may measure the interference signal according to the interference signal measurement resource allocation information. At this time, the receiver 1320 can receive the interference signal measurement resource allocation information from the reception point through the UE-specific RRC message. Also, the receiver 1320 can receive the CSI-RS allocation information together with the interference signal measurement resource allocation information.

At this time, the interference signal measurement resource allocation information in the operation of the base station 1200 and the terminal 1300 may include resource allocation information and subframe allocation information. Meanwhile, the resource allocation information may be composed of four resource elements within one physical resource block pair. In this case, the four resource elements may be configured with ZP-CSI-RS allocation.

The description of the content specification relating to the standard specification mentioned in the above-mentioned embodiment is omitted for the sake of simplicity and constitutes a part of this specification. Therefore, it is to be understood that the content of some of the contents related to the above standard is added to or included in the scope of the present invention.

The following documents specifically attached form part of this specification as part of the already published documents. Therefore, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.

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 scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (24)

1. A method for transmitting interfering signal measurement resource allocation information in a transmission point of a transmission point in a wireless communication system including two or more different transmission points,
Constructing two or more interference signal measurement resource allocation information used for downlink interference signal measurement of a specific terminal; And
And transmitting the interference signal measurement resource allocation information discriminated by using the interference signal measurement resource index indicating the interference signal measurement resource allocation information to the terminal,
Wherein the interference signal measurement resource allocation information includes information on a resource element in which one or more of the two or more transmission points mutate.
The method according to claim 1,
Wherein the interference signal measurement resource allocation information includes resource allocation information and subframe allocation information.
3. The method of claim 2,
Wherein the resource allocation information includes configuration information for four resource elements in one pair of physical resource blocks.
The method according to claim 1,
And transmitting the interference signal measurement resource allocation information to the terminal in the step of transmitting the interference signal measurement resource allocation information to the terminal through the terminal-specific RRC message. Way.
1. A method for a terminal to measure an interference signal in a wireless communication system comprising two or more different transmission points,
The interference signal measurement resource allocation information discriminated using the interference signal measurement resource index indicating two or more interference signal measurement resource allocation information used for measuring a downlink interference signal of a specific terminal is transmitted to one of the transmission points ; And
Measuring an interference signal according to the interference signal measurement resource allocation information,
Wherein the interference signal measurement resource allocation information includes information on a resource element that is muted by at least one of the two or more transmission points.
6. The method of claim 5,
Wherein the interference signal measurement resource allocation information includes resource allocation information and subframe allocation information.
The method according to claim 6,
Wherein the resource allocation information includes configuration information for four resource elements in one physical resource block pair.
6. The method of claim 5,
Wherein the step of receiving the interference signal measurement resource allocation information from the transmission point comprises receiving the interference signal measurement resource allocation information from the transmission point through a terminal-specific RRC message.
In a wireless communication system including two or more different transmission points, at any one of the transmission points,
A controller configured to construct two or more interference signal measurement resource allocation information used for downlink interference signal measurement of a specific terminal; And
And a transmitter for transmitting the interference signal measurement resource allocation information identified using the interference signal measurement resource index indicating the interference signal measurement resource allocation information to the terminal,
Wherein the interference signal measurement resource allocation information includes information on resource elements to which one or more of the two or more transmission points mutate.
10. The method of claim 9,
Wherein the interference signal measurement resource allocation information includes resource allocation information and subframe allocation information.
11. The method of claim 10,
Wherein the resource allocation information includes configuration information for four resource elements in one physical resource block pair.
10. The method of claim 9,
Wherein the transmission unit transmits the interference signal measurement resource allocation information to the terminal through a terminal-specific RRC message.
A terminal connected to a wireless communication system including two or more different transmission points,
The interference signal measurement resource allocation information discriminated using the interference signal measurement resource index indicating two or more interference signal measurement resource allocation information used for measuring a downlink interference signal of a specific terminal is transmitted to one of the transmission points And a control unit And
And a controller for measuring an interference signal according to the interference signal measurement resource allocation information,
Wherein the interference signal measurement resource allocation information includes information on resource elements to which one or more of the two or more transmission points mutate.
14. The method of claim 13,
Wherein the interference signal measurement resource allocation information includes resource allocation information and subframe allocation information.
15. The method of claim 14,
Wherein the resource allocation information includes configuration information for four resource elements in one physical resource block pair.
14. The method of claim 13,
Wherein the receiving unit receives the interference signal measurement resource allocation information from the transmission point through a terminal-specific RRC message.
delete
delete
delete
delete
delete
delete
delete
delete
KR1020120144604A 2012-09-07 2012-12-12 Method for Transmitting and Receiving Configuration Information of Interference Measurement Resource, Method for Measuring Interference Measurement Resource, Terminal and Transmission Point thereof KR101526163B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020120099237 2012-09-07
KR20120099237 2012-09-07
KR1020120116939 2012-10-19
KR20120116939 2012-10-19

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US14/017,458 US9137810B2 (en) 2012-09-07 2013-09-04 Transmitting configuration information of interference measurement resource, and measuring interference
PCT/KR2013/007999 WO2014038857A1 (en) 2012-09-07 2013-09-05 Transmitting configuration information of interference measurement resource, and measuring interference
JP2015531004A JP6039810B2 (en) 2012-09-07 2013-09-05 Interference measurement resource setting information transfer and interference measurement
CN201380058356.4A CN104770041B (en) 2012-09-07 2013-09-05 Transmission interference measures the configuration information of resource and measurement interference

Publications (2)

Publication Number Publication Date
KR20140032854A KR20140032854A (en) 2014-03-17
KR101526163B1 true KR101526163B1 (en) 2015-06-05

Family

ID=50644250

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120144604A KR101526163B1 (en) 2012-09-07 2012-12-12 Method for Transmitting and Receiving Configuration Information of Interference Measurement Resource, Method for Measuring Interference Measurement Resource, Terminal and Transmission Point thereof

Country Status (3)

Country Link
JP (1) JP6039810B2 (en)
KR (1) KR101526163B1 (en)
CN (1) CN104770041B (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012109037A2 (en) * 2011-02-11 2012-08-16 Qualcomm Incorporated Method and apparatus for enabling channel and interference estimations in macro/rrh system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102223712B (en) * 2010-04-19 2015-03-11 华为技术有限公司 Transmission method, base station and user equipment for measurement reference signals
JP5092026B2 (en) * 2011-02-14 2012-12-05 株式会社エヌ・ティ・ティ・ドコモ Base station apparatus, mobile terminal apparatus, and communication control method
JP5526165B2 (en) * 2012-01-30 2014-06-18 株式会社Nttドコモ Wireless communication system, base station apparatus, user terminal, and channel state information measuring method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012109037A2 (en) * 2011-02-11 2012-08-16 Qualcomm Incorporated Method and apparatus for enabling channel and interference estimations in macro/rrh system

Also Published As

Publication number Publication date
JP6039810B2 (en) 2016-12-07
CN104770041B (en) 2018-11-27
KR20140032854A (en) 2014-03-17
CN104770041A (en) 2015-07-08
JP2015532819A (en) 2015-11-12

Similar Documents

Publication Publication Date Title
US10004065B2 (en) Method and apparatus for transreceiving downlink signal by considering antenna port relationship in wireless communication system
JP6215382B2 (en) Method and apparatus for improved control channel based operation in a wireless communication system
JP2018014732A (en) Method for interference cancellation in wireless communication system and apparatus therefor
US20170064678A1 (en) Method and apparatus for transmitting/receiving downlink signal considering antenna port relationship in wireless communication system
JP6286495B2 (en) Method and apparatus for receiving downlink signal in wireless communication system
JP2016140114A (en) Method and apparatus for receiving data in wireless communication system supporting cooperative transmission
JP6129374B2 (en) Method and apparatus for providing setting information of channel state information reference signal in wireless communication system supporting multiple antennas
US20180083757A1 (en) Method and apparatus for configuraton, measurement and reporting of channel state information for lte tdd with dynamic ul/dl configuration
JP6175187B2 (en) Method and apparatus for interference cancellation in a wireless communication system
JP2019134430A (en) Method for transmitting uplink control information and device therefor
JP6254659B2 (en) Method and apparatus for receiving or transmitting a downlink control signal in a wireless communication system
KR101857643B1 (en) User equipment and method for resource allocation and device-to-device discovery hopping
KR101925032B1 (en) Method and apparatus for estimating channel in wireless communication system
KR101938346B1 (en) Method, Terminal and Transmission/Reception Point for Controlling Transmit Power of Uplink Sounding Reference Signal
JP6437933B2 (en) Synchronous information receiving method for direct communication between terminals and apparatus therefor
US9930651B2 (en) Downlink control information configuration and acquisition method, base station and terminal
US9451488B2 (en) Method and apparatus for channel state information feedback in wireless communication system
KR101662088B1 (en) Method and device for transmitting channel state information in wireless communication system
JP6200944B2 (en) Method and apparatus for transmitting / receiving reference signal in wireless communication system
US9345017B2 (en) Method and apparatus for transreceiving downlink signal by considering antenna port relationship in wireless communication system
JP5703398B2 (en) Primary cell indication method and apparatus for demodulating control channel
KR101710394B1 (en) Method and apparatus of transmitting channel information for reference signal
KR20150035555A (en) Method and device for reporting channel state information in wireless communication system
EP2771991B1 (en) Method and apparatus for allocating resources in wireless communication system
US9712278B2 (en) Adjusting blind decoding of downlink control channel

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20180524

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20190528

Year of fee payment: 5