WO2015151729A1 - 移動局、基地局、上りリンク信号送信方法及び上りリンク信号受信方法 - Google Patents
移動局、基地局、上りリンク信号送信方法及び上りリンク信号受信方法 Download PDFInfo
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- WO2015151729A1 WO2015151729A1 PCT/JP2015/056806 JP2015056806W WO2015151729A1 WO 2015151729 A1 WO2015151729 A1 WO 2015151729A1 JP 2015056806 W JP2015056806 W JP 2015056806W WO 2015151729 A1 WO2015151729 A1 WO 2015151729A1
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- uplink
- mobile station
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- 238000000034 method Methods 0.000 title claims description 44
- 230000008054 signal transmission Effects 0.000 title claims description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 254
- 230000004913 activation Effects 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 20
- 238000001514 detection method Methods 0.000 abstract description 9
- 238000007726 management method Methods 0.000 description 20
- 238000004891 communication Methods 0.000 description 8
- 230000009849 deactivation Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012790 confirmation Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Classifications
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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
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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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
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1896—ARQ related signaling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/146—Uplink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/248—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where transmission power control commands are generated based on a path parameter
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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]
Definitions
- the present invention relates to a mobile station, a base station, an uplink signal transmission method, and an uplink signal reception method.
- the current LTE (Long Term Evolution) system is operated in the frequency band assigned to the carrier.
- a frequency band is called a license band because it is used by a telecommunications carrier with a license.
- Transmission of uplink data in the license band is performed with resources allocated by the base station. Specifically, when the base station receives a buffer status report (BSR: Buffer Status Report) indicating that uplink data exists from the mobile station, the base station shares the physical uplink with the mobile station by the base station scheduler.
- a channel (PUSCH: Physical Uplink Shared Channel) resource is allocated, and an uplink grant (UL grant) is transmitted using a physical downlink control channel (PDCCH: Physical Downlink Control Channel).
- the mobile station transmits uplink data after a predetermined time (for example, 4 ms) after detecting UL grant (see Non-Patent Document 1).
- An unlicensed band is a frequency band used in WiFi or the like, and is a frequency band in which a plurality of systems can coexist without requiring a license.
- FIG. 1 shows uplink data transmission when this LBT method is applied to PUSCH transmission by UL grant.
- the base station executes LBT before PDCCH transmission, and transmits PDCCH when transmission is possible (S1).
- S1 When the mobile station receives PDCCH and detects UL grant, it executes LBT after a predetermined time, transmits uplink data if transmission is possible, and uplink data if transmission is impossible Cancel transmission.
- FIG. 1 shows a case where uplink data transmission is stopped (S2).
- the base station again performs LBT before transmitting the PDCCH, and transmits the PDCCH when transmission is possible (S3).
- the mobile station executes LBT after a predetermined time and transmits uplink data if transmission is possible (S4).
- the base station cannot determine whether the mobile station cannot detect UL grant and does not transmit uplink data, or whether the mobile station does not transmit uplink data based on the LBT result.
- the base station should perform adaptive control to ensure communication quality.
- uplink data when uplink data is not transmitted according to the result of LBT, adaptive control is unnecessary, and for example, LBT should be executed again by changing time or frequency. In such a case, since the communication quality is not bad, handling different from the case where the mobile station cannot detect the UL grant and does not transmit uplink data is necessary. If appropriate adaptive control is not performed by the base station, uplink data may not be transmitted / received.
- the present invention proposes an uplink signal transmission method in an unlicensed band.
- a mobile station is: A mobile station that communicates with a base station using an unlicensed band, A resource management unit for managing information on uplink transmission resources allocated by the base station; A transmission detector that detects whether transmission in the unlicensed band is possible before the allocated uplink transmission resource arrives; When transmission in the unlicensed band is possible, a transmission unit that transmits an uplink signal using the allocated uplink transmission resource; Have
- a base station is A base station that communicates with a mobile station using an unlicensed band, A resource setting unit for allocating uplink transmission resources to the mobile station; A receiving unit for receiving an uplink signal using an uplink transmission resource allocated to the mobile station; Have
- An uplink signal transmission method includes: An uplink signal transmission method in a mobile station that communicates with a base station using an unlicensed band, Managing information of uplink transmission resources allocated by the base station; Detecting whether transmission in the unlicensed band is possible before the allocated uplink transmission resource arrives; If transmission in the unlicensed band is possible, transmitting an uplink signal with the allocated uplink transmission resource; Have
- An uplink signal receiving method includes: An uplink signal reception method in a base station that communicates with a mobile station using an unlicensed band, Allocating uplink transmission resources to mobile stations; Receiving an uplink signal with an uplink transmission resource allocated to the mobile station; Have
- uplink signals can be transmitted and received between the base station and the mobile station in the unlicensed band.
- Diagram showing uplink data transmission using unlicensed band Functional block diagram of a base station according to an embodiment of the present invention
- Functional block diagram of a mobile station according to an embodiment of the present invention The sequence diagram which shows the communication procedure of the uplink data in the unlicensed band which concerns on the Example of this invention
- Flowchart of PUSCH transmission method in mobile station according to an embodiment of the present invention The figure which shows the example which discriminates the process number at the time of resending
- wireless communications system which concerns on the Example of this invention may utilize a license band, in order to ensure the connectivity of a mobile station (UE) and a base station (eNB).
- CA Carrier ⁇ Aggregation
- the license band may be treated as a primary cell that ensures the connectivity between the mobile station and the base station, and the unlicensed band may be treated as a secondary cell that is additionally set to the primary cell.
- the unlicensed band may be treated as a primary cell, and the license band may not be used.
- the LBT method is used for wireless access in the unlicensed band after confirming that no other device is transmitting a signal.
- the mobile station executes LBT after a predetermined time after detecting UL grant and transmits uplink data if transmission is possible, and transmission is impossible. In this case, uplink data transmission is stopped. Therefore, the base station cannot determine whether the mobile station cannot detect UL grant and does not transmit uplink data, or whether the mobile station does not transmit uplink data based on the LBT result.
- the base station allocates uplink transmission resources in the unlicensed band to the mobile station.
- the uplink transmission resource may be semi-statically allocated by an RRC (Radio Resource Control) layer instead of being dynamically allocated by UL resource.
- RRC Radio Resource Control
- the base station performs activation to make the uplink transmission resource available. This activation may be performed by the mobile station.
- the mobile station detects whether or not transmission is possible by executing LBT before the allocated uplink transmission resource arrives, and transmits uplink data if transmission is possible.
- the base station attempts reception using the allocated uplink transmission resource.
- uplink data transmission can be realized without using UL grant in the unlicensed band. Therefore, the base station does not need to consider the case where the mobile station cannot detect UL grant and does not transmit uplink data.
- FIG. 2 shows a functional block diagram of the base station 10 according to the embodiment of the present invention.
- the base station 10 includes a downlink (DL) signal transmission unit 101, an uplink (UL) signal reception unit 103, a resource setting unit 105, an activation control unit 107, and a physical uplink shared channel (PUSCH) reception unit. 109.
- the user equipment (UE) capability receiving unit 111 and the transmission power control unit 113 will be described later in the following modification.
- the DL signal transmission unit 101 transmits a signal including downlink data and control information to the mobile station using the license band and / or the unlicensed band. As information for receiving an uplink signal from a mobile station, the DL signal transmission unit 101 transmits information on uplink transmission resources allocated to the mobile station. In addition, the DL signal transmission unit 101 transmits control information for activating uplink transmission resources.
- the UL signal receiving section 103 receives a signal including uplink data and control information from a mobile station in a license band and / or an unlicensed band.
- the UL signal receiving unit 103 attempts to receive an uplink signal using an uplink transmission resource allocated to the mobile station.
- the resource setting unit 105 allocates uplink transmission resources to the mobile station.
- the uplink transmission resource may be semi-statically allocated by an RRC (Radio Resource Control) layer instead of being dynamically allocated by UL resource.
- RRC Radio Resource Control
- the activation control unit 107 activates the uplink transmission resource allocated to the mobile station. In order to avoid the UL signal reception unit 103 from attempting to receive an uplink signal even when there is no uplink signal, activation is performed to enable uplink transmission resources when necessary. . For example, the activation control unit 107 confirms a buffer status report (BSR) reported on the license band side, and activates the uplink transmission resource when the amount of uplink data is larger than a predetermined threshold.
- BSR buffer status report
- the PUSCH receiving unit 109 tries to demodulate and decode PUSCH from the signal received by the UL signal receiving unit 103 using the uplink transmission resource allocated by the resource setting unit 105.
- FIG. 3 shows a functional block diagram of the mobile station 20 according to the embodiment of the present invention.
- the mobile station 20 includes a DL signal reception unit 201, a UL signal transmission unit 203, a resource management unit 205, a timer management unit 207, a buffer management unit 209, a transmission detection unit 211, and a PUSCH transmission unit 213.
- the UE capability notification unit 215 and the transmission power control unit 217 will be described later in the following modification.
- the DL signal receiving unit 201 receives a signal including downlink data and control information from the base station in the license band and / or the unlicensed band. As information for transmitting an uplink signal to the base station, the DL signal receiving unit 201 receives information on the uplink transmission resource allocated by the base station. In addition, the DL signal reception unit 201 receives control information for activating uplink transmission resources.
- the UL signal transmission unit 203 transmits a signal including uplink data and control information to the base station using the license band and / or the unlicensed band.
- the UL signal transmission unit 203 transmits an uplink signal using an uplink transmission resource allocated by the base station.
- the resource management unit 205 manages information on uplink transmission resources allocated by the base station. Further, the resource management unit 205 activates the uplink transmission resource according to an instruction from the base station. The resource management unit 205 may autonomously activate the uplink transmission resource based on the amount of data in the buffer instead of the instruction from the base station.
- the timer management unit 207 releases or deactivates the uplink transmission resource after a predetermined period from the allocation or activation of the uplink transmission resource.
- Release of uplink transmission resources means deletion of uplink transmission resource information allocated to the mobile station, and uplink transmission by the base station again for uplink signal transmission. It needs to be assigned a resource and activated.
- the deactivation of the uplink transmission resource means that the uplink transmission resource is temporarily disabled while maintaining the uplink transmission resource allocated to the mobile station. In order to transmit a link signal, an uplink transmission resource may be activated.
- the buffer management unit 209 manages the amount of uplink data stored in the buffer of the mobile station. This amount of uplink data is reported to the base station in the buffer status report.
- the buffer status report may be reported in a license band.
- the transmission detection unit 211 detects whether or not transmission in the unlicensed band is possible before the uplink transmission resource allocated by the base station arrives. Specifically, the transmission detection unit 211 executes LBT to confirm that no other device is transmitting a signal before a predetermined period of the uplink transmission resource allocated for transmitting the uplink data. To do. When the LBT result can be transmitted, transmission by the PUSCH transmission unit 213 is permitted. On the other hand, when the LBT result cannot be transmitted, the transmission by the PUSCH transmission unit 213 is suspended.
- the PUSCH transmission unit 213 performs processing such as PUSCH encoding and modulation in order to transmit uplink data using PUSCH.
- processing such as PUSCH encoding and modulation in order to transmit uplink data using PUSCH.
- the PUSCH transmission unit 213 transmits uplink data via the UL signal transmission unit 203.
- FIG. 4 shows a communication procedure of uplink data in the unlicensed band according to the embodiment of the present invention.
- the resource setting unit 105 of the base station semi-statically allocates uplink transmission resources to the mobile station (S101).
- Semi-static allocation is not based on dynamic allocation as needed like UL grant, but on the assumption that it will be used for a certain period of time.
- the uplink transmission resource allocated once may be changed.
- the uplink transmission resource to be allocated may be specified by time and / or frequency, and may be associated with other setting information (for example, DRX config).
- the uplink transmission resource may be allocated after a predetermined time after returning from the DRX state to the non-DRX state by DRX config.
- the mobile station or the base station determines an uplink transmission resource from the different setting information.
- a single uplink transmission resource may be allocated to the mobile station, or a plurality of uplink transmission resources may be allocated. When a plurality of uplink transmission resources are allocated, each resource may be allocated so as not to overlap, or may be allocated overlappingly. For example, for the same mobile station, uplink transmission resources of nth subframe, n + 4 subframe, n + 8 subframe, n + 12 subframe, n + 16 subframe,. In addition to being set, uplink transmission resources of the nth subframe, the (n + 8) th subframe, the (n + 16) th subframe, and so on may be set.
- the same uplink transmission resource may be allocated to a plurality of mobile stations.
- the resource setting unit 105 notifies the mobile station of uplink transmission resources via the DL signal transmission unit 101. Allocation of uplink transmission resources may be notified by an RRC signal (RRC connection reconfiguration) as shown (S103). Further, in order to prevent data with strict delay requirements such as voice from being transmitted in the unlicensed band, the resource setting unit 105 includes a data type (specifically, bearer, A logical channel (LCH: logical channel) or a logical channel group (LCG: logical channel group) may be notified.
- a data type specifically, bearer, A logical channel (LCH: logical channel) or a logical channel group (LCG: logical channel group) may be notified.
- the resource management unit 205 of the mobile station sets up uplink transmission resources allocated by the base station.
- the completion of the setting may be notified by an RRC signal (RRC connection reconfiguration complete) (S105).
- the activation control unit 107 of the base station performs activation for enabling uplink transmission resources when necessary in order to avoid trying to receive uplink data even when there is no uplink data. Perform (S107). Specifically, the activation control unit 107 confirms the buffer status report reported on the license band side, and if the amount of uplink data is larger than a predetermined threshold, the U-plane to be transmitted in the unlicensed band Determine that data has occurred and activate uplink transmission resources. If the amount of uplink data is equal to or less than a predetermined threshold or if there is a concern about insufficient resources in the unlicensed band, the activation control unit 107 may deactivate the uplink transmission resource. Activation / deactivation of the uplink transmission resource may be performed by a MAC (Medium Access Control) layer signal MAC (CE) (MAC Control Element) or a physical layer signal.
- MAC Medium Access Control
- CE MAC Control Element
- the uplink transmission resource is activated / deactivated according to the instruction of the base station, but the uplink transmission resource may be activated / deactivated at the judgment of the mobile station. For example, when the amount of uplink data in the buffer status report is larger than a predetermined threshold, the mobile station autonomously activates the uplink transmission resource. Further, when the amount of uplink data in the buffer status report is equal to or less than a predetermined threshold, the uplink transmission resource is autonomously deactivated. In this case, the activation / deactivation of the mobile station may be reported to the base station using a license band.
- uplink transmission resources When multiple uplink transmission resources are allocated as described above, which one to activate may be specified using a resource identifier or the like. For example, for the same mobile station, uplink transmission resources of nth subframe, n + 4 subframe, n + 8 subframe, n + 12 subframe, n + 16 subframe,. When the uplink transmission resources of the nth subframe, the n + 8th subframe, the n + 16th subframe, etc. are set, either one of them is activated by the activation control unit 107. It may be activated.
- the PUSCH transmission unit 213 of the mobile station transmits the PUSCH using the allocated uplink transmission resource (S109).
- the mobile station transmission detection unit 211 executes LBT to detect whether transmission is possible before the activated uplink transmission resource arrives.
- the PUSCH transmission unit 213 of the mobile station transmits uplink data via the UL signal transmission unit 203, and when the LBT result cannot be transmitted, the UL signal transmission unit 203 Suspend transmission via.
- the transmission unit 213 may stop transmission of uplink data.
- the PUSCH transmission unit 213 may prioritize PUSCH transmission in the license band, or may prioritize PUSCH transmission in the unlicensed band.
- a modulation scheme (MCS: Modulation and Coding Scheme) used by the PUSCH transmission unit 213 in PUSCH transmission in the unlicensed band may be indicated by downlink control information in the license band of the base station.
- MCS Modulation and Coding Scheme
- PUSCH transmission may be performed using the instructed MCS for a predetermined period.
- a default setting is used. Also good.
- the PUSCH receiving unit 109 of the base station receives the PUSCH using the allocated uplink transmission resource (S109).
- the PUSCH receiving unit 109 may receive the PUSCH using the MCS indicated in the license band from the base station.
- MCS the allocated uplink transmission resource
- PUSCH may be received using default settings.
- the PUSCH receiving unit 109 of the base station transmits an acknowledgment (PHICH (Physical Hybrid-ARQ Indicator Channel) ACK or RLC (Radio Link Control ACK)) for the received uplink data via the DL signal transmitting unit 101.
- the delivery confirmation may be sent in the unlicensed band or may be sent in the license band.
- the activation control unit 107 of the base station deactivates the uplink transmission resource when the PUSCH reception is completed (S111). Specifically, the activation control unit 107 determines that the U-plane data to be transmitted in the unlicensed band is exhausted when the amount of uplink data in the buffer status report is equal to or less than a predetermined threshold, and the uplink Deactivate the sending resource. As described above, the uplink transmission resource may be deactivated at the judgment of the mobile station. Deactivation of uplink transmission resources may be performed for each resource.
- a timer may be used to deactivate the uplink transmission resource for each resource.
- the timer management unit 207 of the mobile station starts the timer when the uplink transmission resource is activated. Each time the uplink transmission resource is used, the corresponding timer may be restarted. Then, when the timer expires, the corresponding uplink transmission resource is deactivated.
- the uplink transmission resource allocated to the mobile station may be released after a predetermined time.
- the uplink transmission resource may be released by an RRC signal from the base station, or may be released based on a timer.
- the timer management unit 207 of the mobile station starts the timer when the uplink transmission resource is allocated.
- the timer may be restarted every time the uplink transmission resource is used.
- the timer expires, the uplink transmission resource is released.
- timers set in advance in the mobile station such as TA (Timing Advance) timer for uplink synchronization and sCellDeactivationTimer for deactivation of secondary cells may be used as the timer.
- FIG. 5 shows a flowchart of the PUSCH transmission method in the mobile station according to the embodiment of the present invention.
- the resource management unit 205 Prior to PUSCH transmission, the resource management unit 205 stores uplink transmission resource information received from the base station via the DL signal receiving unit 201. The resource management unit 205 also manages activation / deactivation of uplink transmission resources (S201).
- the buffer management unit 209 confirms the amount of uplink data in the buffer of the mobile station and detects that uplink data has occurred (S203).
- the buffer management unit 209 reports a buffer status report indicating the amount of uplink data to the base station.
- the transmission detection unit 211 executes LBT before a predetermined period of the uplink transmission resource (S205).
- the PUSCH transmission by the PUSCH transmission unit 213 When the LBT result cannot be transmitted (S205: No), the PUSCH transmission by the PUSCH transmission unit 213 is suspended. On the other hand, when the LBT result can be transmitted (S205: Yes) and the uplink transmission resource is activated (S207: Yes), the PUSCH transmission by the PUSCH transmission unit 213 is permitted. Even if the LBT result can be transmitted (S207: Yes), if the uplink transmission resource is not activated (S207: No), the PUSCH transmission by the PUSCH transmission unit 213 is suspended. Note that confirmation of activation of uplink transmission resources (S207) may be performed before confirmation of LBT (S205), or these confirmations may be performed simultaneously. When PUSCH transmission is permitted, the PUSCH transmission unit 213 transmits uplink data through the UL signal transmission unit 203 (S209).
- PUSCH transmission has been particularly described.
- other uplink signal transmissions for example, sounding reference signal (SRS: Sounding Reference Signal), physical uplink control channel (PUCCH: Physical) It is also applicable to Uplink Control Channel).
- SRS Sounding reference signal
- PUCCH Physical uplink control channel
- uplink data transmission can be realized without using UL grant, but HARQ (Hybrid Automatic Repeat Request) retransmission control using UL grant cannot be realized.
- HARQ Hybrid Automatic Repeat Request
- the mobile station associates the TTI (Transmission Time Interval) with the HARQ process number when it receives the UL grant. For example, if UL grant is received at the nth TTI, HARQ process number 0 is assigned to the nth TTI, HARQ process number 1 is assigned to the n + 1th TTI, and so on. Assign HARQ process number 7 to. Further, HARQ process number 0 is again assigned to the (n + 8) TTI, HARQ process number 1 is again assigned to the (n + 9) TTI, and HARQ process number 7 is similarly assigned to the (n + 15) TTI.
- TTI Transmission Time Interval
- the base station can specify the HARQ process number from the TTI.
- the base station since UL grant is not used in uplink data transmission in the unlicensed band described in the above embodiment, the base station cannot identify the HARQ process number from TTI.
- the PUSCH transmission unit 213 of the mobile station transmits the new transmission data and the corresponding retransmission data with a process number for retransmission control. That is, as shown in FIG. 6A, the HARQ process number is explicitly notified to the base station in the PUSCH.
- the PUSCH receiving unit 109 of the base station receives retransmission data according to the HARQ process number notified in the PUSCH.
- the PUSCH transmission unit 213 of the mobile station and the PUSCH reception unit 109 of the base station may associate the uplink transmission resource allocated by the base station with the process number. For example, as shown in FIG. 6B, an nth TTI, an n + 3 TTI, an n + 6 TTI, and an n + 8 TTI are allocated for PUSCH transmission in an unlicensed band. In this case, it may be assumed that uplink data corresponding to HARQ process number 1 is transmitted in the nth TTI and the n + 8 TTI. In this way, by transmitting uplink data having a specific HARQ process number using a specific uplink transmission resource, the base station can specify the HARQ process number from the TTI.
- the PUSCH transmission unit 213 of the mobile station may notify an NDI (New Data Indicator) indicating whether it is new transmission data or retransmission data.
- NDI New Data Indicator
- the amount of uplink transmission resources that can be used in a mobile station depends on the mobile station implementation (eg, memory or CPU). If the base station allocates uplink transmission resources excessively, the resources are wasted.
- the UE capability notification unit 215 of the mobile station notifies the base station of the mobile capability regarding the set amount of the uplink transmission resource.
- the mobile capability may be a value indicating how many uplink transmission resources can be set simultaneously.
- the mobile capability needs to be notified before the allocation of uplink transmission resources (S101 in FIG. 4). For example, to notify mobile functional capabilities such as UE category used for reporting the type of mobile unit, CA band combination for notifying the capability of the mobile unit for each CA band in carrier aggregation (set)
- the mobile capability regarding the set amount of the uplink transmission resource may be notified together with the message.
- the UE capability receiving unit 111 of the base station receives the mobile capability notified from the mobile station, and the resource setting unit 105 allocates an uplink transmission resource based on the received mobile capability. Note that, when the mobile functional power is not notified from the mobile station, the resource setting unit 105 may allocate an uplink transmission resource using a default value.
- uplink data transmission can be realized without using a UL grant, but the mobile station cannot receive a TPC (Transmission Power Control) command transmitted together with the UL grant. .
- TPC Transmission Power Control
- the transmission power control unit 217 of the mobile station controls the transmission power using the TPC command used for the uplink signal in the license band, that is, the TPC command transmitted together with the UL grant in the license band.
- the transmission power control unit 113 of the base station may perform transmission power control in the license band without performing transmission power control in the unlicensed band.
- the transmission power control unit 113 of the base station may perform transmission power control in the unlicensed band and notify the TPC command for the unlicensed band in the license band.
- the TPC command for the unlicensed band may be notified by MAC CE, which is a MAC layer signal of the license band.
- the transmission power control unit 217 of the mobile station controls the transmission power using the TPC command notified in the license band. Note that the transmission power control unit 113 of the base station and the transmission power control unit 217 of the mobile station control the transmission power even at the time of deactivation regardless of the activation state of the uplink transmission resource of the unlicensed band. Alternatively, the transmission power may be controlled when the uplink transmission resource of the unlicensed band is activated.
- the transmission power control unit 217 of the mobile station controls the transmission power using the TPC command used for the uplink signal in the license band, and additionally adds the TPC command for the unlicensed band notified in the license band. You may apply and control transmission power.
- the same uplink transmission resource may be allocated to a plurality of mobile stations.
- the base station needs to know which mobile station the PUSCH is from. Specifically, the base station was able to decode and decode CRC bits using identifiers (C-RNTI: Cell-Radio Network Temporary Identifiers) of multiple mobile stations associated with uplink transmission resources. In this case, it is possible to determine which mobile station the PUSCH is from.
- C-RNTI Cell-Radio Network Temporary Identifiers
- the PUSCH reception processing amount of the base station at this time increases in proportion to the number of mobile stations.
- an identifier (referred to as UC-RNTI here) set according to the uplink transmission resource is used. use.
- the resource setting section 105 of the base station allocates an uplink transmission resource to the mobile station, and associates an identifier (UC ⁇ ) for decoding uplink data in association with the uplink transmission resource.
- RNTI identifier for decoding uplink data in association with the uplink transmission resource.
- the resource management unit 205 of the mobile station manages information on an identifier (U-C-RNTI) for decoding uplink data in association with uplink transmission resources.
- the PUSCH transmission unit 213 of the mobile station When transmitting uplink data, the PUSCH transmission unit 213 of the mobile station scrambles the identifier set according to the uplink transmission resource, and uses the identifier (C-RNTI) of the mobile station together with the uplink data. Send.
- the identifier of the mobile station may be transmitted by being included in a MAC PDU (Protocol Data Unit).
- the PUSCH receiving unit 109 of the base station decodes the PUSCH using U-C-RNTI set according to the uplink transmission resource. Since U-C-RNTI does not depend on the mobile station but depends on the uplink transmission resource, the reception processing amount of the base station is reduced. Moreover, by using U-C-RNTI, erroneous detection of PUSCH, reception from an unauthorized mobile station, and the like can be avoided. On the other hand, the PUSCH receiving unit 109 of the base station can identify the mobile station that transmitted the PUSCH from the MAC PDU.
- uplink signals can be transmitted and received between a base station and a mobile station in an unlicensed band. Since the base station can receive the uplink data without using the UL grant, there is no need to consider the case where the mobile station cannot detect the UL grant and does not transmit the uplink data.
- the base station since the uplink transmission resources allocated semi-statically in advance are activated as necessary, the base station does not need to try to receive useless PUSCH.
- retransmission control and transmission power control by not using UL grant can be realized in the unlicensed band.
- the reception processing at the base station when the same uplink transmission resource in the unlicensed band is allocated to a plurality of mobile stations can be reduced. That is, the resources in the unlicensed band can be effectively used without complicating the reception process of the base station.
- the base station and the mobile station according to the embodiment of the present invention are described using functional block diagrams, but the base station and the mobile station according to the embodiment of the present invention may be hardware, software, or A combination thereof may be realized.
- the functional units may be used in combination as necessary.
- the method according to the embodiment of the present invention may be performed in an order different from the order shown in the embodiment.
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Abstract
Description
アンライセンスバンドを用いて基地局と通信する移動局であって、
基地局により割り当てられた上りリンク送信用リソースの情報を管理するリソース管理部と、
割り当てられた上りリンク送信用リソースが到来する前に、アンライセンスバンドにおける送信が可能であるか否かを検出する送信検出部と、
アンライセンスバンドにおける送信が可能である場合、割り当てられた上りリンク送信用リソースで上りリンクの信号を送信する送信部と、
を有する。
アンライセンスバンドを用いて移動局と通信する基地局であって、
移動局に対して上りリンク送信用リソースを割り当てるリソース設定部と、
移動局に割り当てた上りリンク送信用リソースで上りリンクの信号を受信する受信部と、
を有する。
アンライセンスバンドを用いて基地局と通信する移動局における上りリンク信号送信方法であって、
基地局により割り当てられた上りリンク送信用リソースの情報を管理するステップと、
割り当てられた上りリンク送信用リソースが到来する前に、アンライセンスバンドにおける送信が可能であるか否かを検出するステップと、
アンライセンスバンドにおける送信が可能である場合、割り当てられた上りリンク送信用リソースで上りリンクの信号を送信するステップと、
を有する。
アンライセンスバンドを用いて移動局と通信する基地局における上りリンク信号受信方法であって、
移動局に対して上りリンク送信用リソースを割り当てるステップと、
移動局に割り当てた上りリンク送信用リソースで上りリンクの信号を受信するステップと、
を有する。
図2に、本発明の実施例に係る基地局10の機能ブロック図を示す。基地局10は、下りリンク(DL)信号送信部101と、上りリンク(UL)信号受信部103と、リソース設定部105と、アクティベーション制御部107と、物理上りリンク共有チャネル(PUSCH)受信部109とを有する。移動機(UE)能力受信部111及び送信電力制御部113については以下の変形例にて後述する。
図3に、本発明の実施例に係る移動局20の機能ブロック図を示す。移動局20は、DL信号受信部201と、UL信号送信部203と、リソース管理部205と、タイマ管理部207と、バッファ管理部209と、送信検出部211と、PUSCH送信部213とを有する。UE能力通知部215及び送信電力制御部217については以下の変形例にて後述する。
図4に、本発明の実施例に係るアンライセンスバンドにおける上りリンクデータの通信手順を示す。
上記の実施例では、UL grantを用いることなく上りリンクデータ送信を実現することができるが、UL grantを用いたHARQ(Hybrid Automatic Repeat Request)再送制御が実現できなくなる。
次に、基地局が移動局に割り当てる上りリンク送信用リソースの量を制御する方法について説明する。
また、上記の実施例では、UL grantを用いることなく上りリンクデータ送信を実現することができるが、移動局は、UL grantと共に送信されるTPC(Transmission Power Control)コマンドを受信することができなくなる。
上記の実施例では、複数の移動局に対して同一の上りリンク送信用リソースが割り当てられてもよい。一方、同一の上りリンク送信用リソースを複数の移動局に割り当てた場合、基地局は、どの移動局からのPUSCHであるかを把握する必要がある。具体的には、基地局は、上りリンク送信用リソースに関連付けられている複数の移動局の識別子(C-RNTI:Cell-Radio Network Temporary Identifier)を用いてCRCビットを復号化し、復号化できた場合に、どの移動局からのPUSCHであるかを判別できる。
本発明の実施例によれば、アンライセンスバンドにおいて基地局と移動局との間で上りリンクの信号の送受信が可能になる。基地局は、UL grantを用いることなく、上りリンクデータを受信することができるため、移動局がUL grantを検出できずに上りリンクデータを送信しないという場合を考慮する必要がなくなる。
101 DL信号送信部
103 UL信号受信部
105 リソース設定部
107 アクティベーション制御部
109 PUSCH受信部
111 UE能力受信部
113 送信電力制御部
20 移動局
201 DL信号受信部
203 UL信号送信部
205 リソース管理部
207 タイマ管理部
209 バッファ管理部
211 送信検出部
213 PUSCH送信部
215 UE能力通知部
217 送信電力制御部
Claims (9)
- アンライセンスバンドを用いて基地局と通信する移動局であって、
基地局により割り当てられた上りリンク送信用リソースの情報を管理するリソース管理部と、
割り当てられた上りリンク送信用リソースが到来する前に、アンライセンスバンドにおける送信が可能であるか否かを検出する送信検出部と、
アンライセンスバンドにおける送信が可能である場合、割り当てられた上りリンク送信用リソースで上りリンクの信号を送信する送信部と、
を有する移動局。 - 上りリンク送信用リソースの割り当て又はアクティベーションから所定の期間後に、上りリンク送信用リソースを解放又はディアクティベーションするタイマ管理部を更に有する、請求項1に記載の移動局。
- 前記送信部は、新規送信データ及び対応する再送データに、再送制御用のプロセス番号を付与して送信する、請求項1又は2に記載の移動局。
- 上りリンク送信用リソースの設定量に関する移動機能力を基地局に通知する移動機能力通知部を更に有する、請求項1乃至3のうちいずれか1項に記載の移動局。
- ライセンスバンドにおける上りリンクの信号に用いられる送信電力制御コマンド又はライセンスバンドで通知された送信電力制御コマンドに従って送信電力を制御する送信電力制御部を更に有する、請求項1乃至4のうちいずれか1項に記載の移動局。
- 前記リソース管理部は、上りリンク送信用リソースに対応付けて上りリンクの信号を復号化するための識別子の情報を保持し、
前記送信部は、上りリンク送信用リソースに応じて設定された識別子によりスクランブル化を施して、上りリンクの信号と共に当該移動局の識別子を送信する、請求項1乃至5のうちいずれか1項に記載の移動局。 - アンライセンスバンドを用いて移動局と通信する基地局であって、
移動局に対して上りリンク送信用リソースを割り当てるリソース設定部と、
移動局に割り当てた上りリンク送信用リソースで上りリンクの信号を受信する受信部と、
を有する基地局。 - アンライセンスバンドを用いて基地局と通信する移動局における上りリンク信号送信方法であって、
基地局により割り当てられた上りリンク送信用リソースの情報を管理するステップと、
割り当てられた上りリンク送信用リソースが到来する前に、アンライセンスバンドにおける送信が可能であるか否かを検出するステップと、
アンライセンスバンドにおける送信が可能である場合、割り当てられた上りリンク送信用リソースで上りリンクの信号を送信するステップと、
を有する上りリンク信号送信方法。 - アンライセンスバンドを用いて移動局と通信する基地局における上りリンク信号受信方法であって、
移動局に対して上りリンク送信用リソースを割り当てるステップと、
移動局に割り当てた上りリンク送信用リソースで上りリンクの信号を受信するステップと、
を有する上りリンク信号受信方法。
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US20160337867A1 (en) | 2016-11-17 |
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JPWO2015151729A1 (ja) | 2017-04-13 |
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