WO2019030932A1 - ユーザ装置、及び参照信号送信方法 - Google Patents
ユーザ装置、及び参照信号送信方法 Download PDFInfo
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- WO2019030932A1 WO2019030932A1 PCT/JP2017/029227 JP2017029227W WO2019030932A1 WO 2019030932 A1 WO2019030932 A1 WO 2019030932A1 JP 2017029227 W JP2017029227 W JP 2017029227W WO 2019030932 A1 WO2019030932 A1 WO 2019030932A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0073—Allocation arrangements that take into account other cell interferences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
Definitions
- the present invention relates to a user equipment in a wireless communication system.
- NR next-generation communication standard
- LTE Long Term Evolution
- LTE-Advanced the next-generation communication standard
- a flexible duplex is studied, which flexibly controls resources used for DL communication and UL communication according to downlink (DL) traffic and uplink (UL) traffic generated.
- DL downlink
- UL uplink
- TDD Time Division Duplex
- DL and UL transmission directions are dynamically changed at certain time intervals such as subframes, slots and minislots. That is, as shown in FIG. 1A, in static TDD applied in LTE, a preset DL / UL configuration (configuration) common among cells is used. On the other hand, in dynamic TDD, as shown in FIG. 1B, individual DL / UL configurations are utilized in each cell. In dynamic TDD, DL / UL configuration is changed to semi-static or flexible.
- UL communication in another cell interferes with DL communication in a certain cell (victim cell)
- victim cell There may be a case where the user equipment in the victim cell can not properly receive the signal from the base station.
- each base station can reduce the influence from other cells / reduce the influence to other cells, It is conceivable to determine the DL / UL configuration of the own cell.
- a user apparatus in one cell transmits a reference signal
- a user apparatus in another cell measures the received power (for example, RSRP) of the reference signal and reports it to the base station. It is conceivable. This measurement is called UE-to-UE measurement (inter-user device measurement).
- the user device transmits UL signal transmission, DL signal reception, D2D (side link) signal transmission and reception And so on, transmission and reception of reference signals and transmission and reception of other signals occur simultaneously, and depending on the capability of the user equipment, transmission and reception of any of the signals may not be possible.
- LTE long term evolution
- the present invention has been made in view of the above, and provides a technique that enables a user apparatus to appropriately transmit or receive a reference signal for interference measurement in inter-user apparatus measurement. With the goal.
- a user equipment in a wireless communication system A setting information management unit that holds setting information for transmission of a reference signal used for interference measurement in another user apparatus; A signal transmission unit that transmits the reference signal based on the setting information; When the transmission of the reference signal and the transmission or reception of another signal compete with each other, the signal transmission unit determines whether to transmit the reference signal based on a predetermined priority.
- a user device is provided.
- a technology that enables a user apparatus to appropriately transmit or receive a reference signal for interference measurement in inter-user apparatus measurement.
- FIG. 2 is a diagram showing an example of a functional configuration of a user device 100.
- FIG. 2 is a diagram showing an example of a functional configuration of a base station 200. It is a figure which shows an example of the hardware constitutions of the user apparatus 100 and the base station 200.
- FIG. 2 is a diagram showing an example of a functional configuration of a user device 100.
- FIG. 2 is a diagram showing an example of a functional configuration of a base station 200. It is a figure which shows an example of the hardware constitutions of the user apparatus 100 and the base station 200.
- the radio communication system according to the present embodiment is assumed to support at least the LTE communication scheme. Therefore, when the wireless communication system operates, the existing technology defined by the existing LTE can be used as appropriate. However, the existing technology is not limited to LTE. Also, “LTE” used in this specification has a broad meaning including LTE-Advanced and LTE-Advanced and later, unless otherwise specified. The present invention is also applicable to communication systems other than LTE.
- FIG. 2 is a block diagram of the wireless communication system 10 in the present embodiment.
- radio communication system 10 in the present embodiment includes user apparatuses 101, 102 and 103 (hereinafter collectively referred to as user apparatus 100) and base stations 201, 202 and 203 (hereinafter base station 200).
- user apparatus 100 user apparatuses 101, 102 and 103
- base stations 201, 202 and 203 hereinafter base station 200.
- base station 200 base station
- the wireless communication system 10 supports dynamic TDD that can control UL and DL individually for each cell.
- the user device 100 is a communication device provided with a wireless communication function such as a smartphone, a mobile phone, a tablet, a wearable terminal, a communication module for M2M (Machine-to-Machine), etc. Use various communication services provided by 10.
- the user equipment may for example be called "UE”.
- the base station 200 is a communication device that provides one or more cells and performs wireless communication with the user device 100.
- three base stations 201, 202, 203 are illustrated as an example, but in general, a large number of base stations 200 are arranged to cover the service area of the wireless communication system 10.
- the base station may be called, for example, "gNB".
- both UL and DL may be OFDMA similar to DL of existing LTE, and UL / DL is the same as that of existing LTE.
- SC-FDMA / OFDMA similar to UL / DL may be used, or other signal waveforms may be used.
- the user apparatus 100 of this Embodiment transmits XSRS mentioned later as a UL signal, in the following description, unless it refuses, it shall not contain XSRS in a "UL signal.”
- the base stations are connected by a communication line (referred to as a backhaul), and information can be transmitted and received between the base stations using, for example, an X2 interface.
- the base stations are synchronized.
- base stations may be asynchronous. In the case of non-synchronization, for example, time shift information is exchanged between base stations, and substantially synchronous operation is possible.
- UL communication and DL communication are performed by several UL / DL patterns. However, it is not limited to these.
- time interval here is the width of one square frame in FIG. 3A (the same applies to B and C) (the width described as “E. g., Subframe, slot or Mini-slot”. ). This "time interval” may be referred to as TTI.
- the UL / DL transmission direction is fixedly set in a part of time intervals, and only the set communication direction is permitted in the relevant time intervals.
- a partial time interval and a section within the time interval (in the illustrated example, the sections at both ends within the time interval are fixedly set to DL and UL)
- UL / DL is fixedly set, and only the set transmission direction is permitted in the relevant time interval.
- UL communication / DL communication is possible at other time intervals.
- FIG. 4 is a diagram showing the frame configuration according to the pattern 3 shown in FIG. 3C in more detail.
- the above-mentioned "time interval" is called a slot.
- the slots used in the following may be replaced with TTI (transmission time interval), unit time frame, subframe, minislot.
- TTI transmission time interval
- the slot time length may be a fixed time length that does not change with the passage of time, or may be a time length that changes with packet size or the like.
- one slot has a leading time interval (DL control channel interval) for the downlink control channel, a time interval for data communication (data interval), and an uplink control channel. It may have a last time interval (UL control channel interval).
- DL control channel interval leading time interval
- data interval time interval for data communication
- UL control channel interval last time interval
- GP guard period
- UL control CH may be transmitted in a short time (eg, 1 symbol). Such a short time UL control CH is called Short PUCCH.
- the cell of the base station 201 is a victim cell, and the cell of the base station 202 and the cell of the base station 203 are both aggressor cells.
- the DL signal from the base station of the aggressor cell and the UL signal from the user apparatus of the aggressor cell become interference.
- the interference due to the UL signal from the user apparatus of the aggressor cell is an example of crosslink interference of DL and UL, for example, the UL data channel from the user apparatus 103 of the aggressor cell is victimized.
- the effect is large, such as interference with the cell's DL control channel.
- the user apparatus 103 of aggressor cell transmits a reference signal
- the user apparatus 101 of victim cell receives the reference signal, and measures the received power of the reference signal.
- the user apparatus 101 transmits the measurement result to the base station 201.
- a plurality of user devices in aggressor cells transmit reference signals
- a plurality of user devices in victim cells perform measurement of reference signals and measurement results, but here, as an example, user device 103 and a user The device 101 is shown.
- the base station 201 When the base station 201 recognizes that the interference from the aggressor cell is large, for example, based on the measurement result received from the user apparatus 101, the base station 201 adjusts the communication direction in the own cell in order to reduce the interference. Alternatively, the measurement result is transmitted to the base station 203 of the aggressor cell, and the base station 203 of the aggressor cell is caused to adjust the transmission direction.
- the reference signal may be SRS (Sounding Reference Signal), DM-RS (Demodulation Reference Signal), CSI-RS (Channel State Information Reference Signal), or RACH (Random Access Channel) Preamble. It may be other signals.
- SRS Sounding Reference Signal
- DM-RS Demodulation Reference Signal
- CSI-RS Channel State Information Reference Signal
- RACH Random Access Channel Preamble. It may be other signals.
- XSRS the reference signal used for UE-to-UE measurement
- normal SRS may be used as XSRS, and in this case, the SRS used for UE-to-UE measurement may be described as SRS.
- the received power which is a measured amount of XSRS
- the measurement amount of XSRS may be reception quality (RSRQ).
- RSRQ reception quality
- each of a plurality of user apparatuses present in each cell performs XSRS transmission and measurement of XSRS received from other cells.
- FIG. 6 is a diagram for describing a basic operation example between the base station 200 and the user apparatus 100 located in the cell (serving cell) of the base station 200.
- the base station 200 transmits XSRS transmission setting information and XSRS reception setting information to the user apparatus 100.
- the transmission of the configuration information is performed, for example, by any of broadcast information (may be referred to as system information), an RRC message, a MAC signal (eg, MAC CE), and DCI (PDCCH / EPDCCH).
- XSRS transmission setting information and XSRS reception setting information it is not essential to transmit both in S101, and transmit any one. It may be
- the XSRS transmission setting information includes, for example, information specifying a resource (time resource and / or frequency resource) for transmitting the XSRS. Also, the XSRS transmission setting information indicates that information specifying a priority, which will be described later, and / or a reference signal to be set (eg, SRS) is for XSRS (that is, for UE-to-UE measurement). It may contain information.
- the XSRS transmission setting information may include gap setting information (the arrival period of the gap, the gap time length, the gap start time position, and the like) for XSRS transmission. In addition, when normal SRS is used as XSRS, XSRS transmission setting information is setting information of normal SRS.
- the XSRS reception setting information includes, for example, information specifying a resource (time resource and / or frequency resource) to receive the XSRS.
- XSRS reception setting information indicates that information specifying a priority described later and / or a reference signal to be set (eg, SRS) is for XSRS (that is, for UE-to-UE measurement). It may contain information.
- the XSRS reception setting information may include gap setting information (the arrival period of the gap, the gap time length, the gap start time position, and the like) for XSRS reception.
- the resource for transmitting XSRS described above is, for example, a resource set as a resource for receiving XSRS in another cell, and the resource for receiving XSRS described above is set, for example, as a resource for transmitting XSRS in another cell It is a resource.
- step S102 the user apparatus 100 performs the XSRS transmission operation according to the XSRS transmission setting information.
- step S103 the user apparatus 100 performs the XSRS reception operation according to the XSRS reception setting information.
- FIG. 7 is a diagram showing signals that can be transmitted and received by the user apparatus 100 in which the cell of the base station 200 is a serving cell. As shown in FIG. 7, user apparatus 100 receives a DL signal from base station 200 and transmits a UL signal to base station 200. Also, the user apparatus 100 transmits and receives XSRS, and transmits and receives D2D signals.
- a resource is set in the user apparatus 100 that transmits XSRS, for example, so as to periodically transmit XSRS at a predetermined timing.
- this setting is assumed to be performed on a cell-by-cell basis, transmission of XSRS and transmission of other signals may conflict in a certain user apparatus.
- FIG. 8 shows a case where the user equipment 103 of the aggressor cell shown in FIG. 5 competes for the transmission of XSRS and the transmission of the Short PUCCH with a certain symbol.
- the contention means that only one signal can be transmitted at any one time (eg, symbol, slot).
- FIG. 8 shows the case where the resources of both signals overlap, but even when they do not overlap, competition may occur due to, for example, the restriction of UE capability.
- the user apparatus 101 of the victim cell is set to receive XSRS using the corresponding symbol. Therefore, for example, when the user apparatus 103 transmits Short PUCCH and drops XSRS, measurement can not be performed with resources that can be measured by the user apparatus 101, and measurement accuracy is degraded. On the other hand, when the user apparatus 103 drops the transmission of the Short PUCCH and transmits XSRS, although the user apparatus 101 can perform measurement, UL communication and DL communication in the user apparatus 103 may be degraded.
- the above example is an example of competition between XSRS transmission and other signal transmissions.
- Example 1 and Example 2 will be described as an example of a method capable of appropriately setting priorities.
- Example 1 In Example 1, XSRS is based on normal SRS. And in Example 1, two types of configuration (configuration) about SRS are provided.
- the setting of SRS used as XSRS (that is, used for UE-to-UE measurement) is called setting for XSRS, and setting of normal SRS (that is, SRS for UL sounding) is called setting for SRS.
- normal SRS setting information For example, normal SRS setting information
- XSRS setting information do not include identification information indicating that the setting information is for XSRS, and include the identification information (type) indicating that the setting information for XSRS is the setting information for XSRS.
- this identification information is assumed to be included in the XSRS transmission setting information, it may be included in the XSRS reception configuration information.
- the priority may be different between the information and the setting information for normal SRS.
- the setting information for normal SRS includes a value indicating that the priority of SRS is lower than the UL signal (eg Shrot PUCCH) as the priority, and the setting information for XSRS has the priority A value is included to indicate that XSRS has a higher priority than the UL signal (e.g. Shrot PUCCH).
- the priority is included in one or both of the XSRS transmission setting information and the XSRS reception setting information.
- the priority of SRS for XSRS transmission (assumed to be used only for UE-to-UE measurement) is used for both UE-to-UE measurement and UL sounding It may be set higher than the priority of the SRS (normal SRS) to be performed.
- the priority is not included in the setting information, that is, when the identification information indicating that the SRS setting for XSRS is included is included in the setting information, for example, the above-described priority regarding the SRS setting including the identification information Degrees apply.
- the time resource of SRS transmission with higher priority is set from the base station 200 to the user apparatus 100 with a time pattern (eg, a bit map with repetition in the time direction). It is also good.
- some transmission parameters may be common to normal SRS and XSRS.
- a transmission parameter of XSRS only a portion different from the transmission parameter of the normal SRS is set from the base station 200 to the user apparatus 100. Thereby, the amount of setting information can be reduced and overhead can be reduced.
- overhead can be reduced by setting the setting for XSRS transmission as a simple setting.
- pre-defined values for precoding for XSRS transmission, antenna port, etc. are used, and a value smaller than the amount used in normal SRS is used as the amount of cyclic shift.
- XSRS since XSRS is used for inter-cell measurement, it is considered that the path propagation delay is larger than that of normal SRS. Therefore, it is preferable to reduce the cyclic shift amount.
- the Comb interval may be, for example, at most 4 so that more users can be multiplexed than normal SRS.
- ⁇ Example of priority> An example of setting the priority between XSRS transmission, XSRS reception, DL reception, UL transmission, and D2D reception will be described below.
- the priority described below is applied to the case where a conflict occurs due to the limitation of the capability of the user apparatus. However, the following priority may be applied regardless of the presence or absence of the limitation of the capability of the user apparatus. In addition, the priority described below can also be applied when XSRS is not based on SRS. Also, the priority described below may be set from the base station 200 to the user apparatus 100 or may be predetermined in the user apparatus 100 without being set from the base station 200 to the user apparatus 100. It may be
- the user apparatus 100 can perform XSRS reception, measurement, and reporting in preference to D2D reception, so that DL communication performance can be protected.
- the priority indicated by “DL reception, UL transmission> XSRS transmission> XSRS reception” may be set.
- performance deterioration of DL and UL can be avoided by prioritizing DL reception and UL transmission over XSRS transmission and XSRS reception.
- the priority of XSRS transmission higher than the priority of XSRS reception in the XSRS reception resource (measurement resource), open the resource even though there is no possibility of XSRS reception (do not use for transmission). It is possible to avoid waste due to
- the user apparatus 100 when contention occurs, the user apparatus 100 does not receive the XSRS based on the priority, for example, that the user apparatus 100 does not perform the demodulation operation in the XSRS reception resource, and / or , Measurement operation (eg, reception power measurement operation) is not performed.
- Measurement operation eg, reception power measurement operation
- the priority indicated by “XSRS transmission> XSRS reception> DL reception> UL transmission” may be set. By this setting, it is possible to maintain the accuracy of UE-to-UE measurement.
- the priority indicated by “DL reception> XSRS transmission> UL transmission> XSRS reception” may be set. This configuration can maintain high UE-to-UE measurement accuracy while protecting DL reception.
- XSRS transmission is set to the symbol shown by A with respect to the user apparatus 103 of aggressor cell.
- the symbol shown in B is a symbol for normal SRS transmission.
- a symbol indicated by A is set as a resource for XSRS reception.
- the priority of XSRS transmission is set to be higher than the priority of PUCCH transmission, and the priority of SRS transmission is set to be lower than the priority of PUCCH transmission.
- the XSRS transmission and the PUCCH transmission compete for the symbol of A, the XSRS transmission is prioritized, and the PUCCH transmission is dropped. This makes it possible to maintain the accuracy of the measurement.
- PUCCH transmission is prioritized and SRS transmission is dropped. Thereby, UL control information can be transmitted.
- the base station 203 may not schedule UL transmission for the resource for which XSRS transmission is set for the user apparatus 103. . Thereby, the user apparatus 103 performing XSRS transmission can perform an operation on the premise that no contention with UL transmission occurs at the time of XSRS transmission.
- the symbol A is set as the XSRS transmission resource for the user apparatus 103, and the PUCCH resource is not allocated to the resource.
- normal SRS may compete with PUCCH, and in the example of FIG. 10, PUCCH is prioritized.
- normal SRS and XSRS are transparent. In other words, there is no difference between the normal SRS and XSRS for the user equipment on the transmitting side. That is, the user apparatus 100 of the aggressor cell transmits the normal SRS without distinguishing the normal SRS and the XSRS.
- the above-described XSRS reception setting information is set from the base station 200 in the user apparatus 100 that receives the SRS.
- the priority is included in the XSRS reception setting information.
- the above-described priority regarding XSRS reception is applied.
- the priority indicated by “DL reception, UL transmission (including SRS transmission)> SRS reception” is applied.
- the priority of SRS reception may be higher than the priority of D2D reception. Thereby, DL performance can be maintained.
- the user apparatus 100 applies the said priority based on the priority contained in XSRS reception setting information.
- the user apparatus 100 may apply the priority when XSRS reception is set by the XSRS reception setting information (does not include the priority).
- the user apparatus 103 of the aggressor cell is set to transmit the SRS with the symbols indicated by A, B, and C. Also, PUCCH transmission has higher priority than SRS transmission.
- the base station 203 When symbols B and C are set from the base station 203 as a PUCCH transmission resource in the user apparatus 103, the base station 203 notifies the setting information to the adjacent base station (here, the base station 201 of the Victim cell).
- the setting information may include priority information.
- the base station 201 does not set the resource as a measurement resource (the resource can be used for another purpose). Also, for example, when the measurement resource is preset, the base station 201 sends, to the user apparatus 101, RRC signaling or L1 signaling (eg, DCI) to stop the measurement in the measurement resource. You may instruct.
- RRC signaling or L1 signaling eg, DCI
- the base station 203 when the base station 203 recognizes that the measurement resource is set in the symbol C of the victim cell based on the information received from the base station 201.
- the user apparatus 103 may be instructed to stop PUCCH transmission and perform SRS transmission.
- Example 3 Next, Example 3 will be described.
- the third embodiment can be applied to any of the first embodiment, the second embodiment, the fourth embodiment, and the fifth embodiment.
- the priority of XSRS transmission and the priority of XSRS reception described in the first embodiment and the second embodiment can be applied, for example, in units of symbols. For example, assuming that symbol n shown in FIG. 12 is a symbol for XSRS transmission or XSRS reception, the priority is controlled in the symbol n. In addition to the symbol n, the symbol n-1 and / or the symbol n + 1 may be subjected to priority control in addition to the symbol n in consideration of switching between transmission and reception.
- symbol n may be a plurality of symbols.
- the user apparatus 100 transmits the specific UL transmission for a specific UL transmission (eg, PRACH transmission). May be prioritized over XSRS transmission or XSRS reception.
- a specific UL transmission eg, PRACH transmission
- the user apparatus 100 receives XSRS reception setting information from the base station 200 of the serving cell, and instead of or in addition to performing XSRS reception setting, sets the adjacent cell (eg, intra-band).
- UE-to-UE measurement may be performed by receiving system information transmitted from a base station in an adjacent cell).
- the user apparatus 100 receives system information transmitted from a base station of an adjacent cell, and based on the system information, configuration information (transmission resource) of SRS (may be XSRS which is not SRS) transmitted by the user apparatus of the adjacent cell.
- the resource information that the user equipment of the adjacent cell transmits SRS may be XSRS that is not SRS) based on the setting information, and receives the SRS (may be XSRS that is not SRS), and the UE -To-UE perform measurement.
- Example 4 A fourth embodiment will now be described.
- the fourth embodiment can be applied to any of the first embodiment, the second embodiment, the third embodiment, and the fifth embodiment.
- one or both of the gap for XSRS transmission and the gap for XSRS reception are set from the base station 200 to the user apparatus 100. Also, a gap that can be used for both XSRS transmission and XSRS reception may be set from the base station 200 to the user apparatus 100 without distinguishing between the gap for XSRS transmission and the gap for XSRS reception.
- the XSRS gap is a gap for XSRS transmission, a gap for XSRS reception, or a gap in which both transmission and reception of XSRS can be performed.
- transmission and reception of signals other than XSRS may be prohibited, and transmission and / or reception of signals other than XSRS may be permitted.
- the user apparatus 100 prioritizes XSRS transmission and / or XSRS reception over DL reception and / or UL transmission in the XSRS gap.
- the user apparatus 100 transmits XSRS even when the transmission of XSRS competes with transmission or reception of another signal in the XSRS gap set from the base station 200. Also, for example, in a gap set from the base station 200, the user apparatus 100 receives the XSRS even when the reception of the XSRS competes with the transmission or reception of another signal.
- receiving XSRS is synonymous with measuring the received power of XSRS.
- XSRS transmission / reception setting resources other than the XSRS gap even if the priority of “DL reception, UL transmission> XSRS transmission> XSRS reception” is set, XSRS transmission is performed in the XSRS gap. And / or XSRS reception is prioritized.
- specific UL transmission and / or specific DL reception may be prioritized over XSRS transmission and / or XSRS reception even within an XSRS gap.
- An example of a specific UL transmission is, for example, PRACH transmission (RACH preamble transmission).
- RACH preamble transmission RACH preamble transmission.
- a specific DL reception there is reception of a DL synchronization signal, reception of a DL broadcast signal, and reception of a DL reference signal.
- FIG. 13 is a diagram illustrating an example of the XSRS gap set in the user apparatus 100.
- an XSRS gap of 5-slot length (may be 5 symbols long) from i to i + 5 is set in the user apparatus 100.
- the said XSRS gap is an example of the gap in which both XSRS transmission and XSRS transmission are possible.
- the user apparatus 100 receives XSRS in a symbol group indicated by A. Also, a time D from the start of slot i to a time when the symbol group of A is opened by a time C of the number of symbols considering transmission / reception switching, and a symbol number of E from the symbol group of A taking into consideration transmission / reception switching E It is possible to make a UL transmission at time F from the moment it was opened to the moment the end of slot i + 5.
- a gap may be used for both XSRS measurement and DL measurement.
- a part of the existing measurement gap for DL measurement may be used as an XSRS gap for performing XSRS measurement.
- FIG. 14 An example in which both the measurement of XSRS and the measurement of DL are performed in the gap is shown in FIG.
- the user apparatus 100 using the illustrated gap performs DL measurement (here, measurement of the frequencies f1, f2, and f3) in 3 ⁇ 4 of the time of the entire gap, Measure XSRS in 1/4 time.
- the length of time for XSRS measurement in the gap is adjusted, for example, by a scaling factor set from the base station 200 or a preset scaling factor.
- the user apparatus 100 calculates the time length for XSRS measurement (T SRS ) according to the following equation, and calculates the time length in the gap Perform XSRS measurement at.
- T SRS T BASIC ⁇ (R SRS ⁇ (N freq, DL +1))
- T SRS is the time used for X SRS measurement.
- T BASIC is the total time of DL measurement and XSRS measurement (eg, the time length of the set gap).
- N BASIC and DL are the number of frequencies to be measured in the DL (eg, the number of inter-frequencies, inter-carriers, inter-RATs, etc.).
- R SRS is a scaling factor for DL measurement and XSRS measurement.
- R SRS is a value satisfying 0 ⁇ R SRS ⁇ 1.
- R SRS may be one or a number larger than one.
- R SRS may be set, for example, by higher layer signaling, or may be defined in advance. If R SRS is 1, then the XSRS measurement time will be the same as the time to measure one different frequency in the DL.
- XSRS measurement may not be performed on the measurement gap for DL measurement.
- measurement of XSRS is performed in the XSRS gap set for XSRS. This protects the DL measurement from the XSRS measurement.
- the measurement gap may be notified to other base stations by backhaul signaling. This enables transmission of XSRS in accordance with the time when the gap is set.
- Example 5 is an example for dropping XSRS transmission.
- the fifth embodiment can be applied to any of the first embodiment, the second embodiment, the third embodiment, and the fourth embodiment.
- the fifth embodiment will be described separately for the transmitting side and the receiving side.
- ⁇ Sender side> For example, when contention occurs between XSRS transmission and transmission of another signal due to, for example, the capacity limitation of the user apparatus 100, the user apparatus 100 may, for example, based on the priority relationship and / or gap setting described above. The XSRS transmission may be dropped. In addition, regardless of the presence or absence of the capability limitation of the user apparatus 100, the drop described below may be applied when a conflict occurs.
- the user apparatus 100 drops XSRS transmission in the XSRS reception gap set from the base station 200. Also, for example, the user apparatus 100 drops XSRS transmission in the measurement gap for DL measurement set from the base station 200.
- the user apparatus 100 drops XSRS in a time interval set from the base station 200 or in a preset time interval in an XSRS transmission opportunity.
- the time interval is, for example, one or more symbols.
- the user apparatus 100 may autonomously determine at which symbol the XSRS transmission is to be dropped.
- the “XSRS transmission opportunity” is, for example, an XSRS transmission resource set by the XSRS transmission setting information, a gap for XSRS transmission set by the XSRS transmission setting information, or the like.
- the user apparatus 100 drops the XSRS transmission in the overlapping time interval to perform measurement. It will be possible to do.
- the drop of XSRS transmission in the user apparatus 100 may be performed when an instruction (schedule) for DL reception is issued from the base station 200. Also, the user apparatus 100 may drop XSRS transmission in a symbol for which UL transmission or XSRS transmission has been prohibited from the base station 200 or in a DL symbol specified for the base station 200. In addition, as long as the user apparatus 100 does not receive an instruction for UL transmission or XSRS transmission from the base station 200, the user apparatus 100 may drop XSRS transmission. Thus, the base station 200 can stop the unexpected XSRS transmission.
- the decrease in measurement accuracy due to the XSRS transmission drop is avoided by a method based on Layer 3 filtering described in Non-Patent Document 1, for example.
- the measurement result (for example, RSRP) of XSRS obtained in the physical layer may be a predetermined threshold (set from the base station 200) or may be preset. If the measurement result obtained in the physical layer is larger than a predetermined threshold (which may be set from the base station 200 or may be preset), or Do not notify upper layer of measurement result. In addition, when the measurement result notified from the physical layer to the upper layer is smaller than a predetermined threshold (or larger than a predetermined threshold), the upper layer ignores the measurement result (used for calculation of the following equation) ) May be used.
- the user apparatus 100 calculates the measurement result in the upper layer based on the following equation, and reports the result to the base station 200.
- F n (1- ⁇ ) ⁇ F n-1 + ⁇ M n
- Mn is the most recent measurement received from the physical layer.
- F n is the updated post-filter measurement result.
- F n-1 is the previous measurement result.
- M 1 is set to F 0 .
- ⁇ is, for example, 1/2 (k / 4) .
- k is a value set from the base station 200 to the user apparatus 100, for example. This is an example, and a value used as ⁇ may be set from the base station 200 to the user apparatus 100, or a value set in advance as ⁇ may be used.
- FIG. 15 An example of the operation is shown in FIG.
- the user apparatus 100 determines that the measurement result (received power) is smaller than the threshold in the first and second XSRS receptions, the user apparatus 100 does not use these measurement results (drops). The same applies to the fourth and fifth times.
- the measurement result is passed from the physical layer to the upper layer, and the measurement result after filtering by the above equation is calculated in the upper layer. , And is transmitted to the base station 200 based on a predetermined report trigger (eg, arrival of a cycle).
- the measurement result is obtained in the physical layer, and filtering is performed in the upper layer (example: layer 3), but this is only an example, and the measurement execution (acquisition of the measurement result) and the filtering Any of the above may be performed in any layer.
- the user apparatus 100 when the user apparatus 100 can not sufficiently obtain the measurement result larger than the threshold, for example, the user apparatus 100 reports information indicating that there is no interference (or that the interference is small) to the base station 200. Do. In addition, when the user apparatus 100 can not sufficiently obtain a measurement result larger than the threshold, the user apparatus 100 may report a predetermined minimum value to the base station 200.
- the transmission power of XSRS may be the same power as normal SRS or PUSCH, or the same power plus an offset, or may be set to different transmission power parameters and / or different absolute values of transmission power. Transmission power setting is performed by higher layer signaling, for example.
- the interference level of the data channel can be estimated by measuring XSRS, and in the latter case, the propagation loss between the interference source and the user terminal can be estimated.
- RACH Preamble when transmitting RACH Preamble as XSRS, transmission is performed based on the signaling (trigger) from the base station with the set transmission power without applying Power ramping, and transmission is performed only once for a certain transmission trigger. Alternatively, transmission may be performed a predetermined number of times or a predetermined number of times.
- the user equipment in the connected state transmits little RACH Preamble, a fixed number of multiplex numbers are secured, and even rough synchronization can be detected. Therefore, when measuring inter-terminal interference at low frequency, RACH Preamble is used as XSRS. It is preferred to use. Note that, in the present specification and claims, RACH Preamble is an example of a reference signal.
- Each of user apparatus 100 and the base station 200 has all the functions described in the present embodiment. However, each of the user apparatus 100 and the base station 200 may be provided with a part of all the functions described in the present embodiment.
- the user apparatus 100 and the base station 200 respectively perform the function of performing the first embodiment, the function of performing the second embodiment, the function of performing the third embodiment, the function of performing the fourth embodiment, and the fifth embodiment. All of the functions may be provided, or any one or more of these functions may be provided.
- FIG. 16 is a diagram showing an example of a functional configuration of the user apparatus 100.
- the user apparatus 100 includes a signal transmission unit 110, a signal reception unit 120, and a setting information management unit 130.
- the signal receiving unit 120 includes a measuring unit 140.
- the functional configuration shown in FIG. 16 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the functional unit may be arbitrary.
- the signal transmission unit 110 is configured to generate a signal of the lower layer from the information of the upper layer, and wirelessly transmit the signal.
- the signal receiving unit 120 is configured to wirelessly receive various signals and acquire information of the upper layer from the received signals.
- the signal reception unit 120 measures the reception power by the measurement unit 140.
- the signal transmission unit 110 determines whether to transmit the XSRS based on the priority or the like at the time of competition between the XSRS and another signal, and determines to transmit.
- Send XSRS The signal transmission unit 110 also has a function of reporting the measurement result of the signal reception unit 120 to the base station 200.
- signal reception section 120 determines whether or not to receive XSRS based on priority etc. at the time of competition between XSRS and another signal, when it is determined to receive.
- Receive XSRS includes the function of performing the filtering process described in the fifth embodiment.
- the setting information management unit 130 has a storage unit that stores setting information set in advance and setting information dynamically and / or semi-statically transmitted from the base station 200 or the like.
- the setting information management unit 130 holds setting information for transmitting a reference signal used for measuring interference in another user apparatus, and the signal transmission unit 110 performs the reference signal based on the setting information.
- Send The signal transmission unit 120 determines whether to transmit the reference signal based on a predetermined priority when, for example, the transmission of the reference signal and the transmission or reception of another signal compete with each other. Do.
- the signal transmission unit 120 transmits the reference signal even when the transmission of the reference signal competes with the transmission or reception of the other signal in the gap set by the base station 200.
- the setting information management unit 130 holds setting information for receiving a reference signal used for interference measurement, and the signal receiving unit 120 receives the reference signal based on the setting information. .
- the signal receiving unit 120 determines whether to receive the reference signal based on a predetermined priority when, for example, the reception of the reference signal and the transmission or reception of another signal compete with each other.
- the signal receiving unit 120 receives the reference signal even when the reception of the reference signal and the transmission or reception of the other signal compete in the gap set from the base station 200. Also, for example, the signal receiving unit 120 measures the reception power of the reference signal, and executes the filtering process on the reception power larger than a predetermined threshold.
- FIG. 17 is a diagram showing an example of a functional configuration of the base station 200.
- the base station 200 includes a signal transmission unit 210, a signal reception unit 220, a scheduling unit 230, a setting information management unit 240, and an NW communication unit 250.
- the functional configuration shown in FIG. 17 is merely an example. As long as the operation according to the present embodiment can be performed, the function classification and the name of the functional unit may be arbitrary.
- the signal transmission unit 210 is configured to generate a signal of the lower layer from the information of the upper layer and wirelessly transmit the signal.
- the signal reception unit 220 is configured to wirelessly receive various signals and acquire information of the upper layer from the received signals.
- the scheduling unit 230 performs resource assignment to the user apparatus 100 and the like. For example, based on the measurement result from the user apparatus 100 received by the signal receiving unit 220, the scheduling unit 230 performs scheduling to avoid interference.
- the setting information management unit 240 includes a storage unit, stores the preset setting information, and has a function of determining and holding the setting information to be set to the user apparatus 100 dynamically and / or semi-statically.
- the NW communication unit 250 transmits and receives, for example, XSRS transmission setting information, XSRS reception setting information, or scheduling information for transmission / reception of a signal by the user apparatus with another base station.
- each functional block may be realized by one device physically and / or logically connected to a plurality of elements, or directly and two or more physically and / or logically separated devices. And / or indirectly (for example, wired and / or wirelessly) connected, and may be realized by the plurality of devices.
- both the user apparatus 100 and the base station 200 in the embodiment of the present invention may function as a computer that performs the process according to the present embodiment.
- FIG. 18 is a diagram showing an example of a hardware configuration of user apparatus 100 and base station 200 according to the present embodiment.
- Each of the above-described user device 100 and base station 200 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.
- the term “device” can be read as a circuit, a device, a unit, or the like.
- the hardware configuration of the user apparatus 100 and the base station 200 may be configured to include one or more of the devices indicated by 1001 to 1006 shown in the figure, or may be configured without including some devices. May be
- Each function in the user apparatus 100 and the base station 200 causes the processor 1001 to perform an operation by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and the communication by the communication apparatus 1004, the memory 1002 And by controlling the reading and / or writing of data in the storage 1003.
- the processor 1001 operates, for example, an operating system to control the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.
- CPU Central Processing Unit
- the processor 1001 reads a program (program code), a software module or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processing according to these.
- a program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
- the signal transmission unit 110, the signal reception unit 120, the setting information management unit 130, and the measurement unit 140 of the user apparatus 100 illustrated in FIG. 16 may be realized by a control program stored in the memory 1002 and operated by the processor 1001. Good.
- control program operating at 1001.
- the various processes described above have been described to be executed by one processor 1001, but may be executed simultaneously or sequentially by two or more processors 1001.
- the processor 1001 may be implemented by one or more chips.
- the program may be transmitted from the network via a telecommunication line.
- the memory 1002 is a computer readable recording medium, and includes, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). It may be done.
- the memory 1002 may be called a register, a cache, a main memory (main storage device) or the like.
- the memory 1002 can store a program (program code), a software module, and the like that can be executed to execute the process according to the embodiment of the present invention.
- the storage 1003 is a computer readable recording medium, and for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray A (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like may be used.
- the storage 1003 may be called an auxiliary storage device.
- the above-mentioned storage medium may be, for example, a database including the memory 1002 and / or the storage 1003, a server or any other suitable medium.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, or the like.
- the signal transmission unit 110 and the signal reception unit 120 of the user apparatus 100 may be realized by the communication apparatus 1004.
- the signal transmission unit 210 and the signal reception unit 220 of the base station 200 may be realized by the communication device 1004.
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside.
- the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured by a single bus or may be configured by different buses among the devices.
- the user apparatus 100 and the base station 200 each include a microprocessor, digital signal processor (DSP), application specific integrated circuit (ASIC), programmable logic device (PLD), field programmable gate array (FPGA), etc. It may be configured to include hardware, and part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented in at least one of these hardware.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- the configuration is a user apparatus in a wireless communication system, and holds setting information for transmitting a reference signal used for measuring interference in another user apparatus.
- a user apparatus characterized by determining whether to transmit the reference signal based on a predetermined priority. This configuration provides a technology that enables the user apparatus to appropriately transmit or receive a reference signal for interference measurement in inter-user apparatus measurement.
- the signal transmission unit may transmit the reference signal even when there is a competition between the transmission of the reference signal and the transmission or reception of the other signal in the gap set by the base station. With this configuration, an opportunity to transmit a reference signal can be secured, and measurement between user devices can be efficiently performed.
- the user apparatus in the wireless communication system further comprising: a setting information management unit that holds setting information for receiving a reference signal used for interference measurement; and the setting information.
- a signal reception unit for receiving the reference signal the signal reception unit based on a predetermined priority when reception of the reference signal and transmission or reception of another signal compete with each other.
- a user apparatus is provided, characterized in that it determines whether to receive the reference signal. This configuration provides a technology that enables the user apparatus to appropriately transmit or receive a reference signal for interference measurement in inter-user apparatus measurement.
- the signal receiving unit may receive the reference signal even when the reception of the reference signal and the transmission or reception of the other signal compete in a gap set from the base station. With this configuration, an opportunity to receive a reference signal can be secured, and measurement between user devices can be efficiently performed.
- the signal receiving unit may measure the reception power of the reference signal, and execute the filtering process on the reception power larger than a predetermined threshold. With this configuration, for example, even if the reference signal is dropped on the transmission side of the reference signal, an appropriate measurement result can be obtained on the reception side.
- the operations of multiple functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by multiple components.
- the order of processing may be changed as long as there is no contradiction.
- the user apparatus 100 and the base station 200 have been described using functional block diagrams for the convenience of the processing description, such an apparatus may be realized in hardware, software or a combination thereof.
- the software operated by the processor of the user apparatus 100 according to the embodiment of the present invention and the software operated by the processor of the base station 200 according to the embodiment of the present invention are random access memory (RAM), flash memory, read only It may be stored in memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.
- notification of information is not limited to the aspect / embodiment described herein, and may be performed by other methods.
- notification of information may be physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof.
- RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.
- Each aspect / embodiment described in the present specification is LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-Wide Band),
- the present invention may be applied to a system utilizing Bluetooth (registered trademark), other appropriate systems, and / or an advanced next-generation system based on these.
- the specific operation supposed to be performed by the base station 200 in this specification may be performed by the upper node in some cases.
- various operations performed for communication with the user equipment 100 may be performed by the base station 200 and / or other than the base station 200. It is clear that it may be done by a network node (for example but not limited to MME or S-GW etc).
- a network node for example but not limited to MME or S-GW etc.
- MME Mobility Management Entity
- the user equipment 100 may be a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, by those skilled in the art. It may also be called a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.
- Base station 200 may also be referred to by those skilled in the art in terms of NB (Node B), eNB (enhanced Node B), Base Station, or some other suitable terminology.
- NB Node B
- eNB enhanced Node B
- Base Station or some other suitable terminology.
- determining may encompass a wide variety of operations.
- “Judgment”, “decision” are, for example, judging, calculating, calculating, processing, processing, deriving, investigating, looking up (for example, a table) (Searching in a database or another data structure), ascertaining may be regarded as “decision”, “decision”, etc.
- “determination” and “determination” are receiving (e.g. receiving information), transmitting (e.g. transmitting information), input (input), output (output), access (Accessing) (for example, accessing data in a memory) may be regarded as “judged” or “decided”.
- the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- 100 user apparatus 110 signal transmitting unit 120 signal receiving unit 130 setting information managing unit 140 measuring unit 200 base station 210 signal transmitting unit 220 signal receiving unit 230 scheduling unit 240 setting information managing unit 250 NW communication unit 1001 processor 1002 memory 1003 storage 1004 communication Device 1005 Input Device 1006 Output Device
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Abstract
Description
しかし、ユーザ装置は、上記測定のための参照信号の送受信以外に、UL信号送信、DL信号受信、D2D(サイドリンク)信号送受信等の他の信号の送受信も行うため、参照信号の送受信と他の信号の送受信とが同時に発生し、ユーザ装置の能力によっては、いずれかの信号の送受信ができなくなる可能性がある。既存のLTE等の従来技術には、UE-to-UE measurementにおいて、このような状況に対処するための具体的な技術は存在しなかった。
他のユーザ装置において干渉の測定に使用される参照信号の送信のための設定情報を保持する設定情報管理部と、
前記設定情報に基づいて、前記参照信号を送信する信号送信部と、を備え、
前記信号送信部は、前記参照信号の送信と、他の信号の送信又は受信とが競合する場合において、所定の優先度に基づいて、当該参照信号を送信するか否かを決定する
ことを特徴とするユーザ装置が提供される。
図2は、本実施の形態における無線通信システム10の構成図である。図2に示すように、本実施の形態における無線通信システム10は、ユーザ装置101、102、103(以降、ユーザ装置100として総称されうる)及び基地局201、202、203(以降、基地局200として総称されうる)を含む。以下の実施の形態では、無線通信システム10は、前述したように、UL及びDLを各セル個別に制御可能なダイナミックTDDをサポートする。
前述したように、本実施の形態では、ダイナミックTDDを使用することから、ダイナミックTDDの構成例について説明する。
本実施の形態において想定しているユーザ装置100に対する干渉パターンについて図5を参照して説明する。図5において、基地局201のセルがvictim cellであり、基地局202のセル及び基地局203のセルはいずれもaggressor cellとする。図5に示すとおり、victim cellのユーザ装置101に対し、aggressor cellの基地局からのDL信号と、aggressor cellのユーザ装置(図5ではユーザ装置103)からのUL信号が干渉となる。特に、aggressor cellのユーザ装置(図5ではユーザ装置103)からのUL信号による干渉は、DLとULのクロスリンク干渉の例であり、例えば、aggressor cellのユーザ装置103からのULデータチャネルがvictim cellのDL制御チャネルに対する干渉になる等、その影響は大きい。
本実施の形態では、例えば図5に示す構成において、aggressor cellのユーザ装置103が参照信号を送信し、victim cellのユーザ装置101が当該参照信号を受信し、当該参照信号の受信電力を測定する。ユーザ装置101は、測定結果を基地局201に送信する。なお、実際には、aggressor cellの複数のユーザ装置が参照信号を送信し、victim cellの複数のユーザ装置が参照信号の測定及び測定結果報告を行うが、ここでは、例としてユーザ装置103とユーザ装置101を示している。
図7は、基地局200のセルをサービングセルとするユーザ装置100が送受信し得る信号を示す図である。図7に示すように、ユーザ装置100は、基地局200からDL信号を受信し、基地局200にUL信号を送信する。また、ユーザ装置100は、XSRSを送受信し、D2D信号を送受信する。
実施例1では、XSRSは、通常のSRSをベースとしている。そして、実施例1では、SRSについての2種類の設定(configuration)を設ける。
XSRS送信、XSRS受信、DL受信、UL送信、D2D受信間の優先度の設定例を以下に説明する。なお、以下で説明する優先度は、ユーザ装置の能力の制限により競合が発生する場合に適用される。ただし、ユーザ装置の能力の制限の有無に関わらずに、下記の優先度を適用してもよい。また、以下で説明する優先度は、XSRSが、SRSベースでない場合にも適用できる。また、以下で説明する優先度は、基地局200からユーザ装置100に設定されることとしてもよいし、基地局200からユーザ装置100への設定がされることなく、ユーザ装置100において予め定められたものとしてもよい。
図9を参照して具体例を説明する。図9に示す例では、aggressor cellのユーザ装置103に対し、Aで示すシンボルにXSRS送信が設定される。また、Bに示すシンボルは、通常のSRS送信のためのシンボルである。また、victim cellのユーザ装置101に対し、Aで示すシンボルが、XSRS受信用のリソースとして設定されている。また、XSRS送信の優先度がPUCCH送信の優先度よりも高く設定され、SRS送信の優先度がPUCCH送信の優先度よりも低く設定されている。
実施例2では、通常のSRSとXSRSとはトランスペアレントである。言い換えると、送信側のユーザ装置にとって、通常のSRSとXSRSとには違いがない。つまり、aggressor cellのユーザ装置100は、通常のSRSとXSRSとを区別することなく通常のSRSを送信する。
次に、実施例3を説明する。実施例3は、実施例1、実施例2、実施例4、実施例5のいずれにも適用できる。実施例1と実施例2で説明したXSRS送信の優先度及びXSRS受信の優先度はそれぞれ、例えば、シンボル単位で適用することができる。例えば、図12に示すシンボルnが、XSRS送信又はXSRS受信のためのシンボルであるとすると、当該シンボルnにおいて優先度が制御される。また、送信と受信の切り替えを考慮して、シンボルnに加えて、シンボルn-1及び/又はシンボルn+1が、シンボルnに加えて優先度の制御の対象とされてもよい。また、ここでは、XSRS送信又はXSRS受信のためのシンボルを1つのシンボルとしたが、XSRS送信又はXSRS受信のために複数シンボルが使用されてもよい。つまり、上記「シンボルn」が複数シンボルであってもよい。
次に、実施例4を説明する。実施例4は、実施例1、実施例2、実施例3、実施例5のいずれにも適用できる。
上記の式において、TSRSは、XSRS測定に使用する時間である。TBASICは、DL測定とXSRS測定のトータルの時間(例:設定されるギャップの時間長)である。NBASIC,DLは、DLにおいて測定対象となる周波数の数(例:異周波数(inter-frequency)、異キャリア(inter-carrier)、異RAT(inter-RAT)等の数)である。RSRSは、DL測定とXSRS測定のためのスケーリングファクタである。
次に、実施例5を説明する。実施例5は、XSRS送信のドロップについての実施例である。実施例5は、実施例1、実施例2、実施例3、実施例4のいずれにも適用できる。実施例5は、送信側と受信側に分けて説明する。
例えばユーザ装置100の能力制限により、XSRS送信と他の信号の送信とで競合が発生する場合に、ユーザ装置100は、例えば、これまでに説明した優先度の関係及び/又はギャップ設定に基づき、XSRS送信をドロップすることとしてよい。なお、ユーザ装置100の能力制限の有無にかかわらすに、競合が発生した場合に、以下で説明するドロップを適用してもよい。
送信側のユーザ装置によるXSRS送信ドロップにより、受信側のユーザ装置では、XSRSの測定精度が低下するという問題がある。
上記の式において、Mnは、物理レイヤから受け取った直近の測定結果である。Fnは、更新されたフィルタ後の測定結果である。Fn-1は、前回の測定結果である。なお、最初の測定結果(1回目の測定結果)を物理レイヤから取得したときに、F0にM1が設定される。αは、例えば1/2(k/4)である。ここで、kは、例えば、基地局200からユーザ装置100に設定される値である。なお、これは一例であり、αとして使用される値が基地局200からユーザ装置100に設定されることとしてもよいし、αとして事前に設定された値を使用してもよい。
以上説明した実施の形態の動作を実行するユーザ装置100及び基地局200の機能構成例を説明する。ユーザ装置100及び基地局200はそれぞれ、本実施の形態で説明した全ての機能を備える。ただし、ユーザ装置100及び基地局200はそれぞれ、本実施の形態で説明した全ての機能の中の一部の機能を備えることとしてもよい。例えば、ユーザ装置100及び基地局200はそれぞれ、実施例1を実施する機能、実施例2を実施する機能、実施例3を実施する機能、実施例4を実施する機能、実施例5を実施する機能のうちの全部の機能を備えても良いし、これらのうちのいずれか複数又はいずれか1つの機能を備えてもよい。
図16は、ユーザ装置100の機能構成の一例を示す図である。図16に示すように、ユーザ装置100は、信号送信部110と、信号受信部120と、設定情報管理部130を含む。信号受信部120は、測定部140を含む。図16に示す機能構成は一例に過ぎない。本実施の形態に係る動作を実行できるのであれば、機能区分及び機能部の名称はどのようなものでもよい。
図17は、基地局200の機能構成の一例を示す図である。図17に示すように、基地局200は、信号送信部210と、信号受信部220と、スケジューリング部230と、設定情報管理部240、NW通信部250を含む。
上記実施の形態の説明に用いたブロック図(図16~図17)は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及び/又はソフトウェアの任意の組み合わせによって実現される。また、各機能ブロックの実現手段は特に限定されない。すなわち、各機能ブロックは、物理的及び/又は論理的に複数要素が結合した1つの装置により実現されてもよいし、物理的及び/又は論理的に分離した2つ以上の装置を直接的及び/又は間接的に(例えば、有線及び/又は無線)で接続し、これら複数の装置により実現されてもよい。
以上、説明したように、本実施の形態によれば、無線通信システムにおけるユーザ装置であって、他のユーザ装置において干渉の測定に使用される参照信号の送信のための設定情報を保持する設定情報管理部と、前記設定情報に基づいて、前記参照信号を送信する信号送信部と、を備え、前記信号送信部は、前記参照信号の送信と、他の信号の送信又は受信とが競合する場合において、所定の優先度に基づいて、当該参照信号を送信するか否かを決定することを特徴とするユーザ装置が提供される。この構成により、ユーザ装置間測定において、ユーザ装置が、干渉の測定のための参照信号を適切に送信又は受信することを可能とする技術が提供される。
以上、本発明の実施の形態を説明してきたが、開示される発明はそのような実施形態に限定されず、当業者は様々な変形例、修正例、代替例、置換例等を理解するであろう。発明の理解を促すため具体的な数値例を用いて説明がなされたが、特に断りのない限り、それらの数値は単なる一例に過ぎず適切な如何なる値が使用されてもよい。上記の説明における項目の区分けは本発明に本質的ではなく、2以上の項目に記載された事項が必要に応じて組み合わせて使用されてよいし、ある項目に記載された事項が、別の項目に記載された事項に(矛盾しない限り)適用されてよい。機能ブロック図における機能部又は処理部の境界は必ずしも物理的な部品の境界に対応するとは限らない。複数の機能部の動作が物理的には1つの部品で行われてもよいし、あるいは1つの機能部の動作が物理的には複数の部品により行われてもよい。実施の形態で述べた処理手順については、矛盾の無い限り処理の順序を入れ替えてもよい。処理説明の便宜上、ユーザ装置100と基地局200は機能的なブロック図を用いて説明されたが、そのような装置はハードウェアで、ソフトウェアで又はそれらの組み合わせで実現されてもよい。本発明の実施の形態に従ってユーザ装置100が有するプロセッサにより動作するソフトウェア及び本発明の実施の形態に従って基地局200が有するプロセッサにより動作するソフトウェアはそれぞれ、ランダムアクセスメモリ(RAM)、フラッシュメモリ、読み取り専用メモリ(ROM)、EPROM、EEPROM、レジスタ、ハードディスク(HDD)、リムーバブルディスク、CD-ROM、データベース、サーバその他の適切な如何なる記憶媒体に保存されてもよい。
110 信号送信部
120 信号受信部
130 設定情報管理部
140 測定部
200 基地局
210 信号送信部
220 信号受信部
230 スケジューリング部
240 設定情報管理部
250 NW通信部
1001 プロセッサ
1002 メモリ
1003 ストレージ
1004 通信装置
1005 入力装置
1006 出力装置
Claims (6)
- 無線通信システムにおけるユーザ装置であって、
他のユーザ装置において干渉の測定に使用される参照信号の送信のための設定情報を保持する設定情報管理部と、
前記設定情報に基づいて、前記参照信号を送信する信号送信部と、を備え、
前記信号送信部は、前記参照信号の送信と、他の信号の送信又は受信とが競合する場合において、所定の優先度に基づいて、当該参照信号を送信するか否かを決定する
ことを特徴とするユーザ装置。 - 前記信号送信部は、基地局から設定されたギャップにおいて、前記参照信号の送信と、前記他の信号の送信又は受信とが競合する場合でも、当該参照信号を送信する
ことを特徴とする請求項1に記載のユーザ装置。 - 無線通信システムにおけるユーザ装置であって、
干渉の測定に使用される参照信号の受信のための設定情報を保持する設定情報管理部と、
前記設定情報に基づいて、前記参照信号を受信する信号受信部と、を備え、
前記信号受信部は、前記参照信号の受信と、他の信号の送信又は受信とが競合する場合において、所定の優先度に基づいて、前記参照信号を受信するか否かを決定する
ことを特徴とするユーザ装置。 - 前記信号受信部は、基地局から設定されたギャップにおいて、前記参照信号の受信と、前記他の信号の送信又は受信とが競合する場合でも、当該参照信号を受信する
ことを特徴とする請求項3に記載のユーザ装置。 - 前記信号受信部は、前記参照信号の受信電力を測定し、所定の閾値よりも大きな受信電力に対してフィルタリング処理を実行する
ことを特徴とする請求項3又は4に記載のユーザ装置。 - 無線通信システムにおけるユーザ装置が実行する参照信号送信方法であって、
前記ユーザ装置は、他のユーザ装置において干渉の測定に使用される参照信号の送信のための設定情報を設定情報管理部に保持しており、
前記参照信号の送信と、他の信号の送信又は受信とが競合する場合において、所定の優先度に基づいて、当該参照信号を送信するか否かを決定し、当該参照信号を送信すると決定した場合に、前記設定情報に基づいて、当該参照信号を送信する信号送信ステップ
を備えることを特徴とする参照信号送信方法。
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| CN201780093668.7A CN110999137A (zh) | 2017-08-10 | 2017-08-10 | 用户装置及参考信号发送方法 |
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| EP4243542B1 (en) * | 2019-02-15 | 2024-10-23 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Wireless communication method, terminal device, and network device |
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