WO2017171026A1 - ユーザ端末、無線基地局及び無線通信方法 - Google Patents
ユーザ端末、無線基地局及び無線通信方法 Download PDFInfo
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- WO2017171026A1 WO2017171026A1 PCT/JP2017/013651 JP2017013651W WO2017171026A1 WO 2017171026 A1 WO2017171026 A1 WO 2017171026A1 JP 2017013651 W JP2017013651 W JP 2017013651W WO 2017171026 A1 WO2017171026 A1 WO 2017171026A1
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- transmission
- lbt
- user terminal
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- signal
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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
- H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
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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
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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
- H04W74/0833—Random access procedures, e.g. with 4-step access
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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
- H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
- H04W74/0875—Non-scheduled access, e.g. ALOHA using a dedicated channel for access with assigned priorities based access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to a user terminal, a radio base station, and a radio communication method in a next-generation mobile communication system.
- LTE Long Term Evolution
- 5G 5th generation mobile communication system
- LTE of 8-12 the specification has been performed on the assumption that exclusive operation is performed in a frequency band (also referred to as a licensed band) licensed by a telecommunications carrier (operator).
- a frequency band also referred to as a licensed band
- the license band for example, 800 MHz, 1.7 GHz, 2 GHz, and the like are used.
- UE User Equipment
- Rel. 13 In LTE it is considered to expand the frequency of the LTE system using an unlicensed spectrum band (also referred to as an unlicensed band) that can be used in addition to the license band.
- an unlicensed spectrum band also referred to as an unlicensed band
- Non-patent document 2 As the unlicensed band, for example, the use of a 2.4 GHz band or a 5 GHz band that can use Wi-Fi (registered trademark) or Bluetooth (registered trademark) is being studied.
- LAA License-Assisted Access
- DC Dual Connectivity
- SA unlicensed band stand-alone
- 3GPP TS 36.300 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2” AT & T, Drivers, Benefits and Challenges for LTE in Unlicensed Spectrum, 3GPP TSG-RAN Meeting # 62 RP-131701
- Wi-Fi In the unlicensed band, in order to coexist with LTE, Wi-Fi or other systems of other operators, the introduction of an interference control function is being studied.
- LBT Listen Before Talk
- CCA Carrier Channel Assessment
- the presence / absence of transmission and / or the transmission timing is changed based on the listening result performed before transmission. For example, when a UL signal is transmitted in an unlicensed band based on an uplink transmission instruction (for example, UL grant) received by a user terminal from a radio base station, the radio base station and the user terminal perform listening before transmission. Is called.
- an uplink transmission instruction for example, UL grant
- the UL data transmission corresponding to the UL grant is affected by the UL listening result even though the radio base station is listening before transmitting the DL signal (UL grant) instructing the transmission of the UL signal. Then, unless both DL and UL listening are successful, UL transmission cannot be performed, and UL signals may not be transmitted for a long period of time.
- signals important for communication such as uplink control information including a delivery confirmation signal (HARQ-ACK) used for DL retransmission control is greatly restricted by listening, communication may not be performed properly. . Therefore, in considering the UL standard for listening, it is important to be able to realize appropriate UL communication.
- HARQ-ACK delivery confirmation signal
- the present invention has been made in view of the above points, and provides a user terminal, a radio base station, and a radio communication method capable of realizing appropriate UL communication in a communication system using a cell in which application of listening is specified.
- the purpose is to provide.
- One aspect of the user terminal of the present invention is a control for controlling transmission of UL data based on a receiving unit that receives a DL signal including a UL transmission instruction, the UL transmission instruction, and a channel access operation before UL transmission. And the control unit performs control so as to perform a channel access operation with random backoff.
- appropriate UL communication can be realized in a communication system using a cell in which application of listening is defined.
- 1A and 1B are diagrams illustrating an example of a communication method using listening (channel access operation). It is a figure which shows the example of application of random backoff.
- 3A and 3B are diagrams for explaining the first mode (condition 1) of the present embodiment.
- 4A and 4B are diagrams for describing the first mode (condition 1) of the present embodiment.
- 5A and 5B are diagrams for explaining the first mode (condition 1) of the present embodiment.
- 7A and 7B are diagrams for explaining the second mode (condition 2) of the present embodiment.
- 8A and 8B are diagrams for explaining a third mode (condition 3) of the present embodiment.
- 10A to 10C are diagrams for explaining a UL LBT information notification method according to the present embodiment. It is a figure which shows an example of schematic structure of the radio
- LTE / LTE-A in an unlicensed band
- an interference control function is required for coexistence with LTE, Wi-Fi, or other systems of other operators.
- a system that operates LTE / LTE-A in an unlicensed band is generally referred to as LAA, LAA-LTE, LTE-U, U-, regardless of whether the operation mode is CA, DC, or SA. It may be called LTE or the like.
- a transmission point for example, a radio base station (eNB), a user terminal (UE), or the like
- a carrier of an unlicensed band may be referred to as a carrier frequency or simply a frequency
- another entity for example, another user terminal
- the transmission point executes listening (LBT: Listen Before Talk) at a timing before a predetermined period from the transmission timing.
- LBT Listen Before Talk
- the transmission point that executes LBT searches the entire target carrier band (for example, one component carrier (CC)) at a timing before a predetermined period before the transmission timing, and other devices It is confirmed whether (for example, a radio base station, a user terminal, a Wi-Fi device, etc.) is communicating in the carrier band.
- CC component carrier
- Listening is whether a signal exceeding a predetermined level (for example, predetermined power) is transmitted from another transmission point or the like before a transmission point (for example, a radio base station, a user terminal, etc.) transmits a signal. This is the operation of detecting / measuring whether the channel is free or busy.
- the listening performed by the radio base station and / or the user terminal may be referred to as channel access procedure, LBT, CCA (Clear Channel Assessment), carrier sense, or the like.
- the transmission point When the transmission point can confirm that no other device is communicating, the transmission point performs transmission using the carrier. For example, when the reception power measured by the LBT (reception signal power during the LBT period) is equal to or less than a predetermined threshold, the transmission point determines that the channel is in an idle state (LBT idle ) and performs transmission.
- LBT idle the reception power measured by the LBT (reception signal power during the LBT period) is equal to or less than a predetermined threshold
- the transmission point determines that the channel is in an idle state (LBT idle ) and performs transmission.
- “the channel is idle” means that the channel is not occupied by a specific system, and the channel is idle, the channel is clear, the channel is free, and the like.
- the transmission point when the transmission point detects that another device is in use even in a part of the target carrier band, the transmission point stops its transmission process. For example, if the transmission point detects that the received power of a signal from another device related to the band exceeds a predetermined threshold, the transmission point determines that the channel is busy (LBT busy ) and transmits Do not do. In the case of LBT busy , the channel can be used only after performing LBT again and confirming that it is in an idle state. Note that the channel idle / busy determination method using the LBT is not limited to this.
- FIG. 1 shows an example of a communication method using listening (channel access operation).
- FIG. 1A shows DL transmission and
- FIG. 1B shows UL transmission.
- DL transmission when the result of listening (DL-LBT) performed by the radio base station before DL transmission is LBT-idle, a period in which DL transmission (DL burst transmission) without LBT is allowed is set. (FIG. 1A).
- the period during which continuous transmission is allowed without performing LBT is the DL maximum channel occupancy period (DL MCOT: DL Maximum Channel Occupancy Time), channel occupancy period, burst period ( Also called burst transmission period, burst length, maximum burst length, maximum allowable burst length, Maximum burst length).
- DL MCOT DL Maximum Channel Occupancy Time
- UL transmission In the case of UL transmission, if the result of the listening (UL-LBT) performed by the user terminal before transmitting UL data is LBT-idle, a period during which UL data transmission (UL burst transmission) without LBT is allowed is set. (FIG. 1B).
- the period during which continuous transmission is allowed without performing LBT is the UL maximum channel occupation period (UL MCOT: UL Maximum Channel Occupancy Time), channel occupation period, burst period ( Also called burst transmission period, burst length, maximum burst length, maximum allowable burst length, Maximum burst length).
- interference control based on the LBT mechanism in the LAA system, interference between the LAA and Wi-Fi, interference between the LAA systems, and the like can be avoided. Further, even when transmission points are controlled independently for each operator who operates the LAA system, interference can be reduced without grasping each control content by the LBT.
- Random backoff means that even if the channel is idle (idle state), each transmission point does not start transmission immediately but waits for transmission for a randomly set period (counter value) If the channel is clear, it refers to the mechanism that starts transmission.
- each transmission point starts data transmission when it is determined by listening that the channel is idle (idle state).
- the possibility of collision between the transmission points increases. Therefore, in order to suppress collision between transmission points, even if the channel becomes idle, each transmission point does not transmit immediately, but waits for transmission for a set period at random and collides between transmission points. Suppresses the probability of randomness (random backoff).
- This LBT mechanism with random backoff is called category 4.
- an LBT mechanism without random backoff is called category 2 (an LBT mechanism in which transmission is permitted immediately after a predetermined time (also called defer duration (D_eCCA)).
- the back-off period set for each transmission point can be determined based on a counter value (random value) set at random.
- the range of the counter value is determined based on the contention window (CW: Contention Window) size. For example, a random backoff counter value is set randomly from a range of 0 to CW size (integer value).
- the CW size is set between the maximum CW value CWmax, p and the minimum CW value CWmin, p.
- a channel access priority class is set by a predetermined waiting time parameter (mp), CWmax, p, CWmin, p, and TMCOT, p.
- the priority class is set as follows.
- Figure 2 shows an example of random backoff application.
- the transmission point generates a counter value for random backoff when the CCA determines that the channel is idle.
- the counter value is held until it can be confirmed that the channel is free for a predetermined period (also referred to as defer period (D_eCCA)).
- D_eCCA defer period
- the transmission point performs sensing in a predetermined time unit (for example, eCCA slot time unit), and when the channel is free, the counter value is decreased, and the counter value is When it reaches zero, transmission can be performed.
- a predetermined time unit for example, eCCA slot time unit
- the counter value is determined from the range associated with the CW size.
- FIG. 2 shows a case where a random value is selected from 1 to 16 as the back-off period. In this way, by controlling transmission based on the random backoff counter value in listening, transmission opportunities can be distributed among a plurality of transmission points to be fair.
- UL grant is transmitted by DL transmission in DL MCOT
- UL data transmission is performed in DL MCOT
- UL grant is transmitted in DL transmission in DL MCOT
- UL data is transmitted outside the DL MCOT.
- a case where part or all of the transmission is performed is considered.
- UL LBT When UL grant is transmitted by DL transmission in DL MCOT and UL data transmission is performed in the DL MCOT, DL LBT is performed, and DL MCOT is set based on the result, so the UL LBT is set.
- Conditions may be relaxed. For example, UL data transmission may be permitted by performing UL LBT for a short time (for example, about 25 ms). Moreover, you may abbreviate
- the conditions applied to DL LBT include the presence / absence of random backoff (category 2, category 4), the category and / or priority class set in each category, UL traffic type, and combinations thereof. . Accordingly, it is possible to realize appropriate UL communication in a communication system using a cell in which application of listening is defined.
- a DL signal including a UL transmission instruction (UL grant) is received, and based on the UL transmission instruction and UL listening (UL LBT) performed before UL transmission.
- UL transmission instruction UL grant
- UL LBT UL listening
- appropriate UL communication is realized by performing control so as to perform a channel access operation with random backoff.
- UL communication is appropriately performed while achieving fairness of LBT load by an appropriate combination of DL LBT and UL LBT.
- the DL LBT used for transmitting the UL grant there is no restriction on the DL LBT used for transmitting the UL grant, that is, it is set in the category (category 2, category 4) and / or each category (category 2, category 4). Categorized using priority class.
- the conditions of UL LBT are determined based on the conditions of DL LBT.
- a combination of the DL LBT condition and the UL LBT condition predetermined condition
- the predetermined condition is notified from the radio base station to the user terminal.
- predetermined conditions are roughly divided into three conditions as follows. These predetermined conditions are determined according to the conditions of DL LBT. In the following description, categories 2 and 4 will be described as examples of listening categories, but the present embodiment is not limited to this.
- Condition 1 In condition 1, DL LBT is category 4 (with random backoff), priority classes 3 and 4, and UL LBT is category 2 (without random backoff). This condition 1 is suitable when large packet data is transmitted by UL.
- Condition 2 In condition 2, DL LBT is category 4 (with random backoff), priority classes 1 and 2, and UL LBT is category 4 (with random backoff).
- UL LBT is differentiated between priority classes 1 and 2 and priority classes 3 and 4.
- the priority classes 1 and 2 are suitable for UL transmission of small packet data. In the case of the degree classes 3 and 4, it is suitable when the large packet data is transmitted by UL.
- Condition 3 In condition 3, DL LBT is set to category 2 (without random backoff), and UL LBT is set to category 4 (with random backoff).
- UL LBT is differentiated between priority classes 1 and 2 and priority classes 3 and 4.
- the priority classes 1 and 2 are suitable for UL transmission of small packet data. In the case of the degree classes 3 and 4, it is suitable when the large packet data is transmitted by UL.
- Condition 1 In the condition 1, when the priority class 3 or the priority class 4 of the DL LBT of category 4 (with random backoff) is applied to the DL transmission including the UL grant, the UL transmission is performed outside the DL MCOT. If so, apply Category 2 (no random backoff) UL LBT.
- FIG. 3 to 5 are diagrams for explaining the first aspect (condition 1) of the present invention.
- the radio base station instructs the user terminal to use the category 2 UL LBT with the UL grant.
- the user terminal sets UL MCOT in category 2 UL LBT.
- a plurality of UL MCOTs may be set according to the UL traffic type (traffic priority class) as shown in FIG. 3B.
- UL traffic type traffic priority class
- multiple subframes may be used for UL MCOT at a time.
- the UL MCOT may be used to determine whether the radio base station schedules a plurality of subframes, and determines how many subframes are actually used when the user terminal is scheduled for a plurality of subframes. May be used to
- UL MCOT with a value smaller than UL MCOT corresponding to the highest priority Traffic Priority class (the Traffic Priority class number in FIG. 3B is small) cannot be selected.
- a UL MCOT with a traffic priority class longer than 1 cannot be selected. That is, in condition 1, as shown in FIG. 4A, if there is UL traffic of traffic priority class 3 or 4 in the UL buffer, UL MCOT of traffic priority class 3 or 4 can be selected ( Fairness), UL MCOT with traffic priority class 1 or 2 cannot be selected (unfairness).
- the radio base station instructs the user terminal to use the category 2 UL LBT with the UL grant.
- the user terminal sets UL MCOT in category 2 UL LBT.
- a plurality of UL MCOTs may be set according to the UL traffic type (traffic priority class) as shown in FIG. 3B.
- UL traffic type traffic priority class
- this UL MCOT may be used to determine whether a radio base station schedules multiple subframes, and determines how many subframes are actually used when a user terminal is scheduled for multiple subframes. May be used to
- Category 2 UL LBT may be used both inside and outside the DL MCOT.
- UL transmission can be performed only within the range of UL MCOT from the timing at which UL transmission is started.
- FIG. 5 shows a specific example in the case of multi-subframe scheduling.
- the radio base station instructs the user terminal to use a category 2 UL LBT with a UL grant.
- the user terminal performs category 2 UL LBT.
- it is a busy state 3 times continuously and is an idle state 4th time.
- the user terminal sets UL MCOT.
- UL MCOT when a specific traffic priority class is selected, first traffic of a traffic priority class with a number smaller than the number of the specific traffic priority class is transmitted, and then the remaining resources in UL MCOT Only when there is a traffic priority class number higher than a specific traffic priority class number may be transmitted together.
- traffic of traffic priority class 2 is transmitted, and then traffic of traffic priority class 3 is transmitted. That is, the traffic priority class 2 and 3 traffic is transmitted by UL MCOT, and the buffer corresponding to the traffic priority class 4 cannot be transmitted and is held in the user terminal.
- condition 1 the information that associates the UL MCOT and the traffic priority class shown in FIG. 3B may be notified from the radio base station to the user terminal by higher layer signaling or downlink control information. You may share beforehand. Also, this information may be sent by LCG (Logical Channel Groups) that sends QCI (Qos Class Indicator).
- LCG Logical Channel Groups
- the information (traffic priority class number) for identifying the UL MCOT shown in FIG. 3B may be notified from the radio base station by upper layer signaling or downlink control information.
- the user terminal may select from the information associated with.
- the lower the traffic priority class number the higher the traffic priority is set.
- the present invention is not limited to this, and the higher the traffic priority class number, You may set so that a priority may be high.
- Condition 2 (Second aspect: Condition 2) In the condition 2, when the priority class 1 or the priority class 2 of the DL LBT of category 4 (with random backoff) is applied to the DL transmission including the UL grant, the UL transmission is performed outside the DL MCOT. If so, apply Category 4 (with random backoff) UL LBT.
- condition 2 are diagrams for explaining the second aspect (condition 2) of the present invention.
- the radio base station instructs the user terminal to use the category 4 UL LBT with a UL grant.
- Condition 2 defines a priority class for category 4 UL LBT.
- the user terminal sets UL MCOT in category 4 UL LBT.
- the priority class is, for example, as shown in FIG. 6, and is set by a predetermined waiting time parameter (mp), CWmax, p, CWmin, p, and TMCOT, p.
- the priority class is set as follows.
- the transmission time length is limited to be short. Therefore, the UL transmission length is set to the UL MCOT of the designated priority class. It is set not to exceed.
- the instructed priority class It is set so as not to be longer than the minimum length required to send traffic of the following class numbers.
- User terminal sets UL MCOT in category 4 UL LBT as described above.
- UL MCOT traffic with a number higher than the priority class number instructed by the radio base station is transmitted after all traffic in the priority class with a number less than or equal to the priority class number instructed by the radio base station is transmitted. It can be sent only when there are extra resources.
- condition 2 the information that associates the UL MCOT and the priority class shown in FIG. 6 may be notified from the radio base station to the user terminal by higher layer signaling or downlink control information. May be shared. Also, this information may be sent by LCG (Logical Channel Groups) that sends QCI (Qos Class Indicator).
- LCG Logical Channel Groups
- FIG. 7 shows a specific example in the case of condition 2.
- the radio base station instructs the user terminal to use a category 4 UL LBT with a UL grant.
- the user terminal performs category 4 UL LBT (here, the random back-off value is 3) instructed from the radio base station.
- the priority class is notified from the radio base station to the user terminal, or is shared in advance by the radio base station and the user terminal.
- transmission is performed with a minimum length necessary for transmitting traffic of a number equal to or lower than the priority class number instructed by the radio base station.
- the traffic of the priority class number instructed by the radio base station is 3, and the priority class number is 3 or less (1 to 3). If there is a surplus resource, traffic with a number higher than the priority class number instructed by the wireless base station (traffic number 4 in FIG. 7B) can be transmitted.
- the shorter UL MCOT is set as the priority class number is smaller.
- the present invention is not limited to this, and even if the priority class number is larger, the shorter UL MCOT is set. good.
- Condition 3 (Third aspect: Condition 3)
- condition 3 when a category 2 (without random backoff) DL LBT is applied to a DL transmission including a UL grant, category 4 (with random backoff) is used when performing UL transmission outside the DL MCOT. ) UL LBT is applied.
- FIG. 8 is a diagram for explaining a third aspect (condition 3) of the present invention.
- the radio base station instructs the user terminal to use the category 4 UL LBT with a UL grant.
- the UL grant is transmitted to the user terminal at the time of DL transmission in the DL MCOT.
- a priority class is defined for category 4 UL LBT (see FIG. 6).
- the user terminal sets UL MCOT in category 4 UL LBT.
- condition 3 when a short predetermined waiting time or a small CW size is applied for fairness, the transmission time length is limited to be short. Therefore, the UL transmission length is set to UL MCOT of the instructed priority class. It is set not to exceed. Further, in the condition 3, in order to prevent intentional transmission for a long time by including low priority traffic even though a short predetermined waiting time or a small CW size is applied, the designated priority class It is set so as not to be longer than the minimum length required to send traffic of the following class numbers.
- User terminal sets UL MCOT in category 4 UL LBT as described above.
- UL MCOT traffic with a number higher than the priority class number instructed by the radio base station is transmitted after all traffic in the priority class with a number less than or equal to the priority class number instructed by the radio base station is transmitted. It can be sent only when there are extra resources.
- condition 3 the information that associates the UL MCOT and the priority class shown in FIG. 6 may be notified from the radio base station to the user terminal by higher layer signaling or downlink control information. May be shared. Also, this information may be sent by LCG (Logical Channel Groups) that sends QCI (Qos Class Indicator).
- LCG Logical Channel Groups
- FIG. 8 shows a specific example in the case of condition 3.
- the radio base station instructs the user terminal to use the category 4 UL LBT (in FIG. 8A, only the UL grant is transmitted by DL transmission).
- the user terminal performs UL LBT of category 4 of the priority class instructed from the radio base station.
- the priority class is notified from the radio base station to the user terminal, or is shared in advance by the radio base station and the user terminal.
- transmission is performed with a minimum length necessary for transmitting traffic of a number equal to or lower than the priority class number instructed by the radio base station.
- traffic with a priority class number of 3 designated by the radio base station and with a priority class number of 3 or less (1 to 3) is transmitted. If there is a surplus resource, traffic with a number higher than the priority class number instructed by the radio base station (traffic number 4 in FIG. 8B) can be transmitted.
- the shorter UL MCOT is set as the priority class number is smaller.
- the present invention is not limited to this, and even if the priority class number is larger, the shorter UL MCOT is set. good.
- Information on UL LBT includes, for example, LBT type (category 2 or category 4), CW size or random backoff value for category 4, priority class and / or MCOT, presence of UL LBT gap for CCA, The length of UL LBT gap for CCA (for example, the number of symbols), ED (Energy detection) threshold (for example, presence / absence of coexistence WiFi), and the like are included.
- Pieces of information are notified from the radio base station to the user terminal by UL grant or common PDCCH. For example, these pieces of information are notified by the number of bits as shown in FIG.
- FIG. 10A an example of a bit table representing the presence or absence of a UL LBT gap is shown in FIG. 10A, and an example of a bit table representing the length of a UL LBT gap is shown in FIG. 10B.
- FIG. 10C shows an example of a bit table that simultaneously indicates the presence or absence of a UL LBT gap and the length of the UL LBT gap.
- the information (bit table or the like) shown in FIG. 9 or FIG. 10 is notified from the radio base station to the user terminal by higher layer signaling, or held and shared in advance by the radio base station and the user terminal.
- the bit information is notified from the station to the user terminal by UL grant or common PDCCH.
- the UL LBT priority class of category 4 is notified from the radio base station to the user terminal. Therefore, it is necessary to report to the radio base station which traffic type is held from the user terminal side.
- the traffic type is reported from the user terminal to the radio base station, for example, it can be performed using at least one of higher layer signaling, MAC signaling, and physical layer signaling.
- the user terminal may determine the priority class of the UL LBT of category 4 based on the type of uplink traffic. This eliminates the need to notify the user terminal of the category 4 UL LBT priority class from the radio base station.
- wireless communication system Wireless communication system
- the radio communication method according to each of the above aspects is applied.
- wireless communication method which concerns on each said aspect may be applied independently, respectively, and may be applied in combination.
- FIG. 11 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention.
- carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied.
- the wireless communication system 1 may be referred to as SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), or the like.
- a radio communication system 1 shown in FIG. 11 includes a radio base station 11 that forms a macro cell C1, and radio base stations 12a to 12c that are arranged in the macro cell C1 and form a small cell C2 narrower than the macro cell C1. .
- the user terminal 20 is arrange
- the user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 that use different frequencies simultaneously by CA or DC. In addition, the user terminal 20 can apply CA or DC using a plurality of cells (CC) (for example, six or more CCs). Further, the user terminal can use the license band CC and the unlicensed band CC as a plurality of cells.
- CC cells
- Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (referred to as an existing carrier or a legacy carrier).
- a carrier having a relatively high frequency band for example, 3.5 GHz, 5 GHz, etc.
- the same carrier may be used.
- the configuration of the frequency band used by each radio base station is not limited to this.
- a wired connection for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.
- a wireless connection It can be set as the structure to do.
- the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- RNC radio network controller
- MME mobility management entity
- Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.
- the radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like.
- the radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point.
- the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.
- Each user terminal 20 is a terminal compatible with various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier-frequency division multiple access
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there.
- the uplink and downlink radio access schemes are not limited to these combinations, and OFDMA may be used in the uplink.
- downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Also, MIB (Master Information Block) is transmitted by PBCH.
- PDSCH downlink shared channel
- PBCH Physical Broadcast Channel
- SIB System Information Block
- MIB Master Information Block
- Downlink L1 / L2 control channels include downlink control channels (PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel)), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), etc. Including. Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH. The number of OFDM symbols used for PDCCH is transmitted by PCFICH. The HAICH transmission confirmation information (ACK / NACK) for PUSCH is transmitted by PHICH.
- EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.
- an uplink shared channel shared by each user terminal 20
- an uplink control channel PUCCH: Physical Uplink Control Channel
- PRACH Physical Random Access Channel
- User data and higher layer control information are transmitted by the PUSCH.
- Uplink control information including at least one of delivery confirmation information (ACK / NACK) and radio quality information (CQI) is transmitted by PUSCH or PUCCH.
- a random access preamble for establishing connection with a cell is transmitted by the PRACH.
- the radio base station transmits a DL signal including a UL transmission instruction, and transmits a predetermined condition for UL listening for UL data transmission after DL listening before DL signal transmission.
- FIG. 12 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention.
- the radio base station 12 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106.
- the transmission / reception unit 103 includes a transmission unit and a reception unit.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access
- Retransmission control for example, HARQ (Hybrid Automatic Repeat reQuest) transmission processing
- HARQ Hybrid Automatic Repeat reQuest
- the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.
- the transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal.
- the radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
- the transmission / reception unit (reception unit) 103 receives uplink control information and uplink data transmitted from the user terminal. For example, the transmission / reception unit (reception unit) 103 receives the uplink control information (UCI) on an uplink channel other than the uplink shared channel (for example, LAA SCell) whose transmission is controlled based on the listening result. As an uplink channel, an uplink control channel and / or an uplink shared channel of another cell (for example, license band CC) can be used.
- the transmission / reception unit (transmission unit) 103 transmits a DL signal (for example, UL grant) to the user terminal. In addition, the transmission / reception unit (transmission unit) 103 transmits a predetermined UL listening condition for UL data transmission after DL listening before DL signal transmission.
- the transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device that is described based on common recognition in the technical field according to the present invention.
- the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.
- the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102.
- the transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102.
- the transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, state management of the radio base station 10, and radio resource management.
- the transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface.
- the transmission path interface 106 transmits and receives (backhaul signaling) signals to and from the adjacent radio base station 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). Also good.
- CPRI Common Public Radio Interface
- X2 interface also good.
- FIG. 13 is a diagram illustrating an example of a functional configuration of the radio base station according to the present embodiment. Note that FIG. 13 mainly shows functional blocks of characteristic portions in the present embodiment, and the wireless base station 10 also has other functional blocks necessary for wireless communication.
- the baseband signal processing unit 104 includes a control unit (scheduler) 301, a transmission signal generation unit (generation unit) 302, a mapping unit 303, a reception signal processing unit 304, a measurement unit 305, It is equipped with.
- the control unit 301 can control transmission / reception of the transmission / reception unit (transmission unit) 103.
- the control unit 301 controls reception of uplink control information and uplink data.
- the control unit 301 controls DL LBT (listening) by the measurement unit 305, and controls transmission of the downlink signal to the transmission signal generation unit 302 and the mapping unit 303 according to the DL LBT result.
- the control unit 301 may be a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- control unit 301 controls the DL LBT of category 2 and the DL LBT of category 4.
- the control unit 301 controls the DL LBT based on predetermined conditions (condition 1 to condition 3) of the DL LBT. That is, the control unit 301 performs control so that the category 4 DL LBT (with random backoff) is performed when the predetermined condition is the condition 1 and the condition 2, and when the predetermined condition is the condition 3, the DL of the category 2 is performed. Control to perform LBT.
- the control unit 301 controls the DL LBT of category 4
- the control unit 301 distinguishes and controls the priority classes 1 and 2 and the priority classes 3 and 4.
- the control unit 301 controls to notify the user terminal of predetermined conditions (condition 1 to condition 3) of UL LBT.
- the transmission signal generation unit 302 generates a DL signal (including a downlink data signal and a downlink control signal) based on an instruction from the control unit 301, and outputs the DL signal to the mapping unit 303.
- transmission signal generation section 302 generates a downlink data signal (PDSCH) including user data and outputs it to mapping section 303.
- the transmission signal generation unit 302 generates a downlink control signal (PDCCH / EPDCCH) including DCI (UL grant) and outputs the downlink control signal (PDCCH / EPDCCH) to the mapping unit 303.
- the transmission signal generation unit 302 generates downlink reference signals such as CRS and CSI-RS, and outputs them to the mapping unit 303.
- the mapping unit 303 maps the DL signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs the DL signal to the transmission / reception unit 103.
- the mapping unit 303 can be a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the UL signal (HARQ-ACK, PUSCH, etc.) transmitted from the user terminal 20.
- the processing result is output to the control unit 301.
- the reception signal processing unit 304 outputs the reception signal and the signal after reception processing to the measurement unit 305.
- the reception signal processing unit 304 may be configured by a signal processor, a signal processing circuit or a signal processing device, and a measuring device, a measurement circuit or a measuring device, which are described based on common recognition in the technical field according to the present invention. it can.
- the measurement unit 305 performs measurement on the received signal.
- the measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 305 Based on the instruction from the control unit 301, the measurement unit 305 performs DL LBT on a carrier (for example, an unlicensed band) in which LBT is set, and the DL LBT result (for example, whether the channel state is idle or busy). The determination result is output to the control unit 301.
- the measurement unit 305 performs channel detection for a predetermined time (defer duration) in the category 2 DL LBT, and the predetermined time (defer duration) and an additional period (an additional slot set at random) in the category 4 DL LBT. Period) channel detection.
- the measurement unit 305 may measure, for example, the received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality)), channel state, and the like of the received signal. .
- the measurement result may be output to the control unit 301.
- a user terminal controls a UL data transmission based on a receiving unit that receives a DL signal including a UL transmission instruction, a UL transmission instruction, and a UL listening performed before the UL transmission.
- a DL signal including a UL transmission instruction, a UL transmission instruction, and a UL listening performed before the UL transmission.
- FIG. 14 is a diagram showing an example of the overall configuration of a user terminal according to an embodiment of the present invention.
- the user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205.
- the transmission / reception unit 203 may include a transmission unit and a reception unit.
- the radio frequency signals received by the plurality of transmission / reception antennas 201 are each amplified by the amplifier unit 202.
- Each transmitting / receiving unit 203 receives the downlink signal amplified by the amplifier unit 202.
- the transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204.
- the transmission / reception unit (reception unit) 203 receives a DL signal (for example, downlink control information, downlink data) transmitted from the radio base station.
- the transmission / reception unit (reception unit) 203 transmits uplink control information and uplink data for the received DL signal.
- the transmission / reception unit 203 can be a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention.
- the baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal.
- the downlink user data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer.
- broadcast information in the downlink data is also transferred to the application unit 205.
- uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like.
- the data is transferred to the transmission / reception unit 203.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it.
- the radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.
- FIG. 15 is a diagram illustrating an example of a functional configuration of the user terminal according to the present embodiment. Note that FIG. 15 mainly shows functional blocks of characteristic portions in the present embodiment, and the user terminal 20 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 15, the baseband signal processing unit 204 included in the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. I have.
- the control unit 401 obtains, from the received signal processing unit 404, a downlink control signal (a signal transmitted by PDCCH / EPDCCH) and a downlink data signal (a signal transmitted by PDSCH) transmitted from the radio base station 10.
- the control unit 401 controls the generation of the uplink control signal and the uplink data signal based on the downlink control signal, the result of determining the necessity of retransmission control for the downlink data signal, and the like.
- the control unit 401 can control the transmission signal generation unit 402, the mapping unit 403, the reception signal processing unit 404, and the measurement unit 405.
- the control unit 401 can control transmission / reception of the transmission / reception unit (transmission unit) 103.
- the control unit 401 controls transmission of uplink control information and uplink data.
- the control unit 401 controls UL LBT (listening) by the measurement unit 405, and controls transmission of the uplink signal to the transmission signal generation unit 402 and the mapping unit 403 according to the UL LBT result.
- the control unit 401 may be a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.
- the control unit 401 controls the UL LBT based on the predetermined conditions (condition 1 to condition 3) of the UL LBT notified from the radio base station. That is, the control unit 401 performs control so that the category 2 UL LBT is performed when the predetermined condition is the condition 1, and the category 4 UL LBT (with random backoff) when the predetermined condition is the condition 2 and the condition 3. ). Further, when controlling the UL LBT of category 4, the control unit 401 controls the priority classes 1 and 2 and the priority classes 3 and 4 separately. Further, the control unit 401 controls the UL channel occupation period (UL MCOT) set after the UL LBT based on the traffic type (priority) of the uplink data signal.
- UL MCOT UL channel occupation period
- the transmission signal generation unit 402 generates a UL signal based on an instruction from the control unit 401 and outputs the UL signal to the mapping unit 403. For example, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401.
- the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the UL grant is included in the downlink control signal notified from the radio base station 10.
- the transmission signal generation unit 402 may be a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.
- the mapping unit 403 maps the uplink signal (uplink control signal and / or uplink data) generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio resource to the transmission / reception unit 203.
- the mapping unit 403 may be a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.
- the reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the DL signal (for example, downlink control signal transmitted from the radio base station, downlink data signal transmitted by PDSCH, etc.). I do.
- the reception signal processing unit 404 outputs information received from the radio base station 10 to the control unit 401 and the measurement unit 405.
- the reception signal processing unit 404 outputs broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401, for example.
- the reception signal processing unit 404 may be configured by a signal processor, a signal processing circuit or a signal processing device, and a measuring device, a measurement circuit or a measuring device which are described based on common recognition in the technical field according to the present invention. it can. Further, the reception signal processing unit 404 can constitute a reception unit according to the present invention.
- the measurement unit 405 performs measurement on the received signal.
- the measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.
- the measurement unit 405 Based on an instruction from the control unit 401, the measurement unit 405 performs UL LBT on a carrier (for example, an unlicensed band) in which LBT is set, and the UL LBT result (for example, whether the channel state is idle or busy). The determination result is output to the control unit 401.
- the measurement unit 405 performs channel detection for a predetermined time (defer duration) in the category 2 UL LBT, and the predetermined time (defer duration) and additional period (additional slots set at random) in the category 4 UL LBT. Period) channel detection.
- the measurement unit 405 may measure, for example, the received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality)), channel state, and the like of the received signal. .
- the measurement result may be output to the control unit 401.
- a DL signal including a UL transmission instruction is transmitted from a radio base station, and this DL signal is received by a user terminal.
- transmission of UL data is controlled based on the UL transmission instruction and the UL LBT performed before the UL transmission.
- UL LBT is performed under predetermined conditions (conditions 1 to 3) notified from the radio base station.
- each functional block (components) are realized by any combination of hardware and / or software.
- the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one physically coupled device, or may be realized by two or more physically separated devices connected by wire or wirelessly and by a plurality of these devices. Good.
- a radio base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs processing of the radio communication method of the present invention.
- FIG. 16 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.
- the wireless base station 10 and the user terminal 20 described above 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 “apparatus” can be read as a circuit, a device, a unit, or the like.
- the hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.
- Each function in the radio base station 10 and the user terminal 20 is obtained by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation, and communication by the communication device 1004, This is realized by controlling reading and / or writing of data in the memory 1002 and the storage 1003.
- the processor 1001 controls the entire computer by operating an operating system, for example.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.
- CPU central processing unit
- the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.
- the processor 1001 reads programs (program codes), software modules, and data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- programs program codes
- software modules software modules
- data data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these.
- the program a program that causes a computer to execute at least a part of the operations described in the above embodiments is used.
- the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks.
- the memory 1002 is a computer-readable recording medium, and may be configured by at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), RAM (Random Access Memory), and the like, for example.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store programs (program codes), software modules, and the like that can be executed to implement the wireless communication method according to an embodiment of the present invention.
- the storage 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk, and a flash memory, for example. .
- the storage 1003 may be referred to as an auxiliary storage device.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.
- a network device for example, the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission path interface 106, and the like described above may be realized by the communication device 1004.
- the input device 1005 is an input device (for example, a keyboard, a mouse, etc.) that accepts external input.
- the output device 1006 is an output device (for example, a display, a speaker, etc.) that performs output to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (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 with a single bus or may be configured with different buses between apparatuses.
- the radio base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured including hardware, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by 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 channel and / or symbol may be a signal (signaling).
- the signal may be a message.
- a component carrier CC may be called a cell, a frequency carrier, a carrier frequency, or the like.
- the radio frame may be configured with one or a plurality of periods (frames) in the time domain.
- Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe.
- a subframe may be composed of one or more slots in the time domain.
- a slot may be composed of one or more symbols (OFDM symbols, SC-FDMA symbols, etc.) in the time domain.
- the radio frame, subframe, slot, and symbol all represent a time unit when transmitting a signal.
- Different names may be used for the radio frame, the subframe, the slot, and the symbol.
- one subframe may be referred to as a transmission time interval (TTI)
- a plurality of consecutive subframes may be referred to as a TTI
- one slot may be referred to as a TTI.
- the subframe or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Also good.
- TTI means, for example, a minimum time unit for scheduling in wireless communication.
- a radio base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI.
- the definition of TTI is not limited to this.
- a resource block is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks.
- the RB may be called a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.
- the resource block may be composed of one or a plurality of resource elements (RE: Resource Element).
- RE Resource Element
- 1RE may be a radio resource region of 1 subcarrier and 1 symbol.
- the structure of the above-described radio frame, subframe, slot, symbol, and the like is merely an example.
- the configuration such as the cyclic prefix (CP) length can be variously changed.
- information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information.
- the radio resource may be indicated by a predetermined index.
- software, instructions, information, etc. may be transmitted / received via a transmission medium.
- software may use websites, servers, or other devices using wired technology (coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.
- the radio base station in this specification may be read by the user terminal.
- each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device).
- the user terminal 20 may have a function that the wireless base station 10 has.
- words such as “up” and “down” may be read as “side”.
- the uplink channel may be read as a side channel.
- a user terminal in this specification may be read by a radio base station.
- the wireless base station 10 may have a function that the user terminal 20 has.
- notification of predetermined information is not limited to explicitly performed, but is performed implicitly (for example, by not performing notification of the predetermined information). May be.
- notification of information is not limited to the aspect / embodiment described in this specification, and may be performed by other methods.
- notification of information includes physical layer signaling (eg, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (eg, RRC (Radio Resource Control) signaling, broadcast information (MIB (Master Information Block)). ), SIB (System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
- the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.
- the MAC signaling may be notified by, for example, a MAC control element (MAC CE (Control Element)).
- MAC CE Control Element
- Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) ), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other suitable wireless communication methods and / or based on them It may be applied to an extended next generation system.
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Abstract
Description
(優先度クラス1)
mp=1、CWmin,p=3、CWmax,p=7、TMCOT,p=2ms、許可CWpサイズ=3,7
(優先度クラス2)
mp=1、CWmin,p=7、CWmax,p=15、TMCOT,p=3ms、許可CWpサイズ=7,15
(優先度クラス3)
mp=3、CWmin,p=15、CWmax,p=63、TMCOT,p=8ms又は10ms、許可CWpサイズ=15,31,63
(優先度クラス4)
mp=7、CWmin,p=15、CWmax,p=1023、TMCOT,p=8ms又は10ms、許可CWpサイズ=15,31,63,127,255,511,1023
条件1では、DL LBTをカテゴリ4(ランダムバックオフあり)で、優先度クラス3,4とし、UL LBTをカテゴリ2(ランダムバックオフなし)とする。この条件1は、ラージパケットデータをUL送信する場合に適している。
条件2では、DL LBTをカテゴリ4(ランダムバックオフあり)で、優先度クラス1,2とし、UL LBTをカテゴリ4(ランダムバックオフあり)とする。UL LBTは、優先度クラス1,2の場合と優先度クラス3,4の場合に区別されており、優先度クラス1,2の場合はスモールパケットデータをUL送信する場合に適しており、優先度クラス3,4の場合はラージパケットデータをUL送信する場合に適している。
条件3では、DL LBTをカテゴリ2(ランダムバックオフなし)とし、UL LBTをカテゴリ4(ランダムバックオフあり)とする。UL LBTは、優先度クラス1,2の場合と優先度クラス3,4の場合に区別されており、優先度クラス1,2の場合はスモールパケットデータをUL送信する場合に適しており、優先度クラス3,4の場合はラージパケットデータをUL送信する場合に適している。
条件1においては、カテゴリ4(ランダムバックオフあり)のDL LBTの優先度クラス3又は優先度クラス4がULグラントを含むDL送信に適用された場合に、そのDL MCOTの外でUL送信を行う場合に、カテゴリ2(ランダムバックオフなし)のUL LBTを適用する。
条件1の手順においては、まず、図3Aに示すように、無線基地局がユーザ端末に対してカテゴリ2のUL LBTを使うことをULグラントで指示する。ユーザ端末は、カテゴリ2のUL LBTにおけるUL MCOTを設定する。ここで、UL MCOTについては、図3Bに示すように、ULトラフィックタイプ(トラフィック優先度クラス)に応じて複数設定しても良い。例えば、優先度の高いトラフィックについては、一度に複数のサブフレームをUL MCOTに使って良いとすることができる。また、このUL MCOTは、無線基地局が複数のサブフレームをスケジューリングするかどうかの判断に使っても良く、ユーザ端末が複数のサブフレームをスケジューリングされた場合に実際に何サブフレーム使うかを判断するために使っても良い。
条件2においては、カテゴリ4(ランダムバックオフあり)のDL LBTの優先度クラス1又は優先度クラス2がULグラントを含むDL送信に適用された場合に、そのDL MCOTの外でUL送信を行う場合に、カテゴリ4(ランダムバックオフあり)のUL LBTを適用する。
条件2の手順においては、まず、無線基地局がユーザ端末に対してカテゴリ4のUL LBTを使うことをULグラントで指示する。条件2においては、カテゴリ4のUL LBT用に優先度クラスを定義する。その後、ユーザ端末は、カテゴリ4のUL LBTにおけるUL MCOTを設定する。
(優先度クラス1)
mp=1、CWmin,p=1、CWmax,p=3、TMCOT,p=1ms、許可CWpサイズ=1,3
(優先度クラス2)
mp=1、CWmin,p=3、CWmax,p=4、TMCOT,p=2ms、許可CWpサイズ=3,4
(優先度クラス3)
mp=3、CWmin,p=4、CWmax,p=6、TMCOT,p=8ms又は10ms、許可CWpサイズ=4,5,6
(優先度クラス4)
mp=3、CWmin,p=4、CWmax,p=7、TMCOT,p=8ms又は10ms、許可CWpサイズ=4,5,6,7
条件3においては、カテゴリ2(ランダムバックオフなし)のDL LBTがULグラントを含むDL送信に適用された場合に、そのDL MCOTの外でUL送信を行う場合に、カテゴリ4(ランダムバックオフあり)のUL LBTを適用する。
条件3の手順においては、まず、無線基地局がユーザ端末に対してカテゴリ4のUL LBTを使うことをULグラントで指示する。条件3においては、DL MCOT内のDL送信の際にULグラントのみをユーザ端末に送信する。条件3においても、条件2と同様にカテゴリ4のUL LBT用に優先度クラスを定義する(図6参照)。その後、ユーザ端末は、カテゴリ4のUL LBTにおけるUL MCOTを設定する。
以下、本発明の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、上記各態様に係る無線通信方法が適用される。なお、上記各態様に係る無線通信方法は、それぞれ単独で適用されてもよいし、組み合わせて適用されてもよい。
本実施の形態において、無線基地局は、UL送信指示が含まれるDL信号を送信すると共に、DL信号の送信前のDLリスニング後のULデータ送信のためのULリスニングの所定条件を送信する。
本実施の形態において、ユーザ端末は、UL送信指示が含まれるDL信号を受信する受信部と、UL送信指示と、UL送信前に行うULリスニングとに基づいてULデータの送信を制御する制御部と、を有し、制御部において、DL信号の送信前のDLリスニング後にULデータ送信を行う場合、無線基地局から通知される所定条件でULリスニングを行う。
なお、上記実施形態の説明に用いたブロック図は、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、物理的に結合した1つの装置により実現されてもよいし、物理的に分離した2つ以上の装置を有線又は無線で接続し、これら複数の装置により実現されてもよい。
Claims (6)
- UL送信指示が含まれるDL信号を受信する受信部と、
前記UL送信指示と、UL送信前のチャネルアクセス動作とに基づいてULデータの送信を制御する制御部と、を有し、
前記制御部は、ランダムバックオフありのチャネルアクセス動作を行うように制御することを特徴とするユーザ端末。 - 前記ランダムバックオフありのチャネルアクセス動作がUL送信指示で指示されることを特徴とする請求項1記載のユーザ端末。
- 前記ランダムバックオフのバックオフ期間はコンテンションウィンドウサイズに基づいて決定され、前記コンテンションウィンドウサイズと優先度クラスとが関連付けられていることを特徴とする請求項1又は請求項2に記載のユーザ端末。
- 前記優先度クラスは無線基地局から指示されることを特徴とする請求項3記載のユーザ端末。
- UL送信指示が含まれるDL信号を送信する送信部と、
前記DL信号の送信前のチャネルアクセス動作を適用して前記DL信号の送信を制御する制御部と、を有し、
前記送信部は、ランダムバックオフありのチャネルアクセス動作をUL送信指示で指示することを特徴とする無線基地局。 - 無線基地局において、UL送信指示が含まれるDL信号を送信するステップと、
ユーザ端末において、UL送信指示が含まれるDL信号を受信するステップと、
ユーザ端末において、前記UL送信指示と、UL送信前のチャネルアクセス動作とに基づいてULデータの送信を制御するステップと、を有し、
ULデータの送信を制御するステップにおいて、ランダムバックオフありのチャネルアクセス動作を行うように制御することを特徴とする無線通信方法。
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| JP2017184201A (ja) | 2017-10-05 |
| CA3017311A1 (en) | 2017-10-05 |
| EP3429304A4 (en) | 2019-02-27 |
| US12273922B2 (en) | 2025-04-08 |
| JP6239672B2 (ja) | 2017-11-29 |
| EP3429304A1 (en) | 2019-01-16 |
| CN108886820A (zh) | 2018-11-23 |
| US20200305199A1 (en) | 2020-09-24 |
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