US20230030623A1 - Method and Device for Notifying Channel Occupation Time, and Base Station and User Equipment - Google Patents
Method and Device for Notifying Channel Occupation Time, and Base Station and User Equipment Download PDFInfo
- Publication number
- US20230030623A1 US20230030623A1 US17/954,212 US202217954212A US2023030623A1 US 20230030623 A1 US20230030623 A1 US 20230030623A1 US 202217954212 A US202217954212 A US 202217954212A US 2023030623 A1 US2023030623 A1 US 2023030623A1
- Authority
- US
- United States
- Prior art keywords
- channel
- symbols
- time slot
- time
- uplink
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 64
- 230000005540 biological transmission Effects 0.000 claims abstract description 40
- 238000001228 spectrum Methods 0.000 abstract description 23
- 230000011664 signaling Effects 0.000 description 9
- 238000004590 computer program Methods 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 4
- 101150116295 CAT2 gene Proteins 0.000 description 2
- 101100392078 Caenorhabditis elegans cat-4 gene Proteins 0.000 description 2
- 101100326920 Caenorhabditis elegans ctl-1 gene Proteins 0.000 description 2
- 101100126846 Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987) katG gene Proteins 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Images
Classifications
-
- 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
-
- H04W72/042—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/002—Transmission of channel access control information
- H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
- H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance
-
- 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
- H04W72/0446—Resources in time domain, e.g. slots or frames
-
- 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 disclosure generally relates to wireless communication technology field, and more particularly, to a method and a device for notifying channel occupation time, a base station and a user equipment.
- a radio frame with a time domain length of 10 ms is divided into 10 subframes with a same length of 1 ms, and each subframe may include multiple time slots according to according to different subcarrier intervals.
- Each time slot includes a certain number of symbols, and a number of symbols is determined by Cyclic Prefix (CP) type.
- CP Cyclic Prefix
- LTE Long Term Evolution
- GP Guard Period
- SF Slot Format
- the SF may be configured in three ways: semi-static cell-level Radio Resource Control (RRC) signaling configuration; User Equipment (UE) specific RRC signaling configuration; and dynamically sending Slot Format Indication (SFI) to a group of UEs through Physical Downlink Control Channel (PDCCH), that is, dynamic slot format information.
- RRC Radio Resource Control
- UE User Equipment
- SFI Slot Format Indication
- PDCCH Physical Downlink Control Channel
- the SFI information carried on the PDCCH may indicate format of one or more time slots on one or more carriers.
- the UE obtains an index information and the index information points to a UE-specific table.
- the UE specific table tells which symbols in the time slot are uplink (UL), which symbols are downlink (DL), and which symbols are “flexible”.
- the UE-specific table is configured and combined in a single-slot-format table.
- the single-slot-format table includes all time slot formats (less than 256) supported in NR. It has been determined that time slot format in the single-slot-format table (as shown in Table 1) includes at most two downlink/uplink (D/U) switching points in each time slot.
- a time slot starts with zero or more DL symbols and ends with zero or more UL symbols, with Unknown symbols in the middle which has at least one Unknown symbol, and at least one DL symbol or at least one UL symbol.
- first seven symbols of the time slot start with zero or more DL symbols and end with at least one UL symbol in Symbol 6, the middle of which is Unknown symbols; and last seven symbols start with zero or more DL symbols, end with zero or more UL symbols, and has zero or more Unknown symbols in the middle.
- 3GPP standards organizations are researching on how to deploy NR networks on unlicensed spectrum, so as to achieve purposes of fair and effective use of unlicensed spectrum and improve data transmission rate in a NR system.
- licensed spectrum and unlicensed spectrum can be combined in a way that is similar to carrier aggregation, that is, a UE and a gNB (which means a 5G base station) may work in both licensed spectrum and unlicensed spectrum.
- a UE and a gNB which means a 5G base station
- LBT Listen-Before-Talk
- LAA Licensed Assisted Access
- nodes in the unlicensed spectrum determines whether a current channel is available or not before data transmission through Clear Channel Assessment (CCA).
- CCA Clear Channel Assessment
- energy detection is used to determine whether the channel is occupied or not in any LBT process.
- Some regional regulations stipulate an energy detection threshold. If energy received by a node is higher than this threshold, the channel is considered as busy.
- LAA License Assisted Access
- a channel access process that is also called Cat 4 channel access
- PDSCH Physical Downlink Shared Channel
- EPDCCH Packet Control Channel
- a channel access process that is also called Cat 2 channel access
- Type 1 channel access is based on Cat 4 channel access
- Type 2 channel access is based on a fixed time length (Cat 2) channel access which has at least 25 us of LBT before transmission.
- Type 1 a channel is detected to determine if it is in an idle state during a defer duration T d , the value of N in Step 4 is 0, and N increases with a sensing slot duration. Steps in Type 1 channel access process are described as follows.
- Step 3 sense the channel for an additional sensing slot duration, and if the additional sensing slot duration is idle, go to step 4; otherwise, go to step 5.
- Step 5 sense the channel for an additional defer duration T d until either a busy sensing slot is detected within the additional defer duration T d or all sensing slots of the additional defer duration T d are detected to be idle.
- Step 6 if the channel is sensed to be idle during all the sensing slot durations of the additional defer duration T d , go to step 4; otherwise, go to step 5.
- MCOT Maximum Channel Occupy Time
- channel access Type 1 and Type 2 The two processes described above may be referred to as channel access Type 1 and Type 2 hereinafter.
- a base station In an unlicensed spectrum, after finishing LBT and accessing a channel successfully, a base station cannot notify a UE of the channel occupation situation, thus it cannot share the channel with the UE effectively.
- Embodiments of the present disclosure provide a method and a device for notifying channel occupation time, a base station and a user equipment, wherein a time slot format information is sent through a PDCCH, so as to notify a UE of the channel occupation situation, thereby sharing the channel with the UE effectively and improving channel occupation rate.
- a method for notifying channel occupation time is provided, wherein the method applies to a base station, including: in an unlicensed spectrum, performing Listen-Before-Talk (LBT) and conducting channel access; and when a channel is accessed successfully, sending a time slot format information which indicates one or more time slots of one or more cells to a UE through a PDCCH, so as to notify the UE that the base station accesses the channel and occupies the channel.
- LBT Listen-Before-Talk
- sending a time slot format information which indicates one or more time slots of one or more cells to a UE through a PDCCH includes: sending the time slot format information which indicates one or more time slots of one or more cells to the UE through Downlink Control Information (DCI) 2-0 of the PDCCH.
- DCI Downlink Control Information
- performing Listen-Before-Talk (LBT) and conducting channel access includes: conducting channel access according to Type 1.
- a transmission period of the PDCCH or an absolute time corresponding to a number of time slot formats indicating a corresponding cell in the PDCCH is less than or equal to a current maximum channel occupation time, all the time slot format information in the PDCCH is channel occupation information.
- the time slot format information in the PDCCH includes channel occupation information and channel release information.
- the channel occupation information includes: when an absolute time corresponding to a number of all time slot formats indicating a corresponding cell in the PDCCH is less than or equal to the maximum channel occupation time, or an absolute time corresponding to a number of partial time slot formats indicating a corresponding cell is less than or equal to the maximum channel occupation time, using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation.
- using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation includes: using all D to indicate that the channel is occupied in an entire time slot, the base station sends downlink data in the entire time slot, and the UE needs to receive; using all U to indicate that the channel is occupied in the entire time slot and the UE can send uplink data in the entire time slot; in a switching point, using D+X+U or X+U to indicate that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol; and in two switching points, indicating that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol.
- the channel release information includes: when a length forma of the absolute time corresponding to the number of time slot formats in the PDCCH indicating a corresponding cell exceeds the maximum channel occupation time, using a specific time slot format to indicate that the maximum channel occupation tine is exceeded or channel release.
- using a specific time slot format to indicate that the maximum channel occupation time is exceeded or channel release includes: using all X to indicate that the maximum channel occupation time is exceeded or channel release in the entire time slot; using DL+X to indicate that the maximum channel occupation time is exceeded or channel release in some time slots; and using all X to indicate that a corresponding cell has not been accessed successfully or the channel is released.
- a method for notifying channel occupation time including: in an unlicensed spectrum, receiving a time slot format information sent by a base station through a PDCCH after the base station accesses a channel successfully, wherein the time slot format information indicates one or more time slots of one or more cells; according to the slot format information, acquiring channel occupation information and channel release information; and according to the channel occupation information and the channel release information, performing downlink reception, uplink transmission or channel access in symbols of each time slot.
- acquiring channel occupation information and channel release information includes: acquiring at least one of the following information: whether the base station accesses the channel successfully or not, a length of channel occupation time, a timing for channel release, and an allocation information of downlink symbols and uplink symbols in each time slot during the channel occupation time.
- performing downlink reception, uplink transmission or channel access in symbols of each time slot includes: receiving a downlink signal or channel in the downlink symbols indicating time slot format.
- performing downlink reception, uplink transmission or channel access in symbols of each time slot includes: in the uplink symbols indicating time slot format, performing channel access according to Type 2 channel access process, or sending an uplink channel or signal directly without performing LBT.
- performing downlink reception, uplink transmission or channel access in symbols of each time slot includes: in the uplink symbols and flexible symbols indicating time slot format, performing channel access according to Type 2 channel access process, or sending a dynamic uplink channel or signal triggered by a physical layer signaling directly without performing LBT.
- a device for notifying channel occupation time wherein the device is located at a base station, including: an access unit, configured to perform LBT and conduct channel access in an unlicensed spectrum; and a transmission unit, when a channel is accessed successfully, configured to send a slot format information which indicates one or more time slots of one or more cells to a UE through a PDCCH, so as to notify the UE that the base station accesses the channel and occupies the channel.
- the transmission unit is configured to send the slot format information which indicates one or more time slots of one or more cells to the UE through DCI 2-0 of the PDCCH.
- the access unit performs channel access according to Type 1.
- a transmission period of the PDCCH or an absolute time corresponding to a number of time slot formats indicating a corresponding cell in the PDCCH is less than or equal to a current maximum channel occupation time, all the time slot format information in the PDCCH is channel occupation information.
- the time slot format information in the PDCCH includes channel occupation information and channel release information.
- the channel occupation information includes: when an absolute time corresponding to a number of all time slot formats indicating a corresponding cell in the PDCCH is less than or equal to the maximum channel occupation time, or an absolute time corresponding to a number of partial time slot formats indicating a corresponding cell is less than or equal to the maximum channel occupation time, using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation.
- using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation includes: using all D to indicate that the channel is occupied in an entire time slot, the base station sends downlink data in the entire time slot, and the UE needs to receive; using all U to indicate that the channel is occupied in the entire time slot and the UE can send uplink data in the entire time slot; in a switching point, using D+X+U or X+U to indicate that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol; and in two switching points, indicating that the channel is occupied in the entire slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol.
- the channel release information includes: when a length of the absolute time corresponding to the number of time slot formats in the PDCCH indicating corresponding cell exceeds the maximum channel occupation time, using a specific time slot format to indicate that the maximum channel occupation time is exceeded or channel release.
- using a specific time slot format to indicate that the maximum channel occupation time is exceeded or channel release includes: using all X to indicate that the maximum channel occupation time is exceeded or channel release in the entire time slot; using DL+X to indicate that the maximum channel occupation time is exceeded or channel release in some time slots; and using all X to indicate that a corresponding cell has not been accessed successfully or the channel is released.
- a device for notifying channel occupation time wherein the device is located at a user equipment, including: a reception unit, configured to receive a slot format information which is sent by a base station through a PDCCH after accessing a channel successfully in an unlicensed spectrum, wherein the slot format information indicates one or more time slots of one or more cells; an acquiring unit, configured to acquire channel occupation information and channel release information according to the time slot format information; and a processing unit, configured to perform downlink reception, uplink transmission or channel access in symbols of each time slot, according to the channel occupation information and the channel release information.
- the acquiring unit acquires at least one of the following information: whether the base station accesses the channel successfully or not, a length of channel occupation time, a timing for channel release, and an allocation information of downlink symbols and uplink symbols in each time slot during the channel occupation time.
- the processing unit receives a downlink signal or channel in the downlink symbols indicating time slot format.
- the processing unit performs channel access according to Type 2 channel access process, or sends an uplink channel or signal directly without performing LBT.
- the processing unit performs channel access according to Type 2 channel access process, or sends a dynamic uplink channel or signal triggered by a physical layer signaling directly without performing LBT.
- a base station having a device for notifying channel occupation time described above wherein the device is located at the base station.
- a user equipment having a device for notifying channel occupation time described above wherein the device is located at the user equipment.
- a method and a device for notifying channel occupation time, a base station and a user equipment are provided. After accessing a channel successfully, the base station sends a time slot format information through a PDCCH to the UE, so as to notify the UE of the channel occupation situation, thereby sharing the channel with the UE effectively and improving channel occupation rate and system performance.
- FIGS. 1 to 5 are exemplary settings of 14 symbols in a time slot according to prior art
- FIG. 6 schematically illustrates a flow chart of a method for notifying channel occupation time according to an embodiment
- FIG. 7 schematically illustrates a flow chart of a method for notifying channel occupation time according to another embodiment
- FIG. 8 schematically illustrates a structural diagram of a device for notifying channel occupation time according to an embodiment
- FIG. 9 schematically illustrates a structural diagram of a device for notifying channel occupation time according to another embodiment.
- Embodiments of the present disclosure provide a method for notifying channel occupation time, wherein the method applies to a base station.
- the method includes S 11 and S 12 .
- the base station performs Listen-Before-Talk (LBT) and conducts channel access.
- LBT Listen-Before-Talk
- a search space carrying DCI 2-0 in a PDCCH is sent according to a high-level signaling configuration, which includes a transmission period and an offset.
- a UE periodically monitors the PDCCH according to the configuration.
- the DCI 2-0 may include time slot formats of multiple slots of multiple cells, wherein a number of cells and a number of slots in each cell are configured by the high-level signaling.
- the base station when a channel is accessed successfully, the base station sends a time slot format information which indicates one or more time slots of one or more cells to the UE through the PDCCH, so as to notify the UE that the base station accesses the channel and occupies the channel.
- the base station sends the time slot format information which indicates one or more time slots of one or more cells to the UE through DCI 2-0 of the PDCCH.
- a method for notifying channel occupation time is provided.
- the base station sends the time slot format information through the PDCCH to the UE, so as to notify the UE of the channel occupation situation. Therefore, after accessing the channel successfully, the base station can share the channel with the UE effectively, thereby improving channel occupation rate and system performance.
- a gNB only after a gNB access the channel according to Type 1, it can send the time slot format information which indicates one or more time slots of one or more cells to the UE.
- duration of Maximum Channel Occupy Time is determined according to channel access priority class, and transmission period of the PDCCH is configured semi-statically.
- the transmission period of the PDCCH or an absolute time corresponding to a number of time slot formats indicating a corresponding cell in the PDCCH is less than or equal to a current MCOT, all the time slot format information in the PDCCH is channel occupation information.
- the time slot format information in the PDCCH includes channel occupation information and channel release information.
- the channel occupation information includes: when an absolute time corresponding to a number of all time slot formats indicating a corresponding cell in the PDCCH is less than or equal to the MCOT, or an absolute time corresponding to a number of partial time slot formats indicating a corresponding cell is less than or equal to the MCOT, using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation.
- all D (format 0 in Table 1) is used to indicate that the channel is occupied in an entire time slot, the gNB sends downlink data in the entire time slot, and the UE needs to receive; all U (format 1 in Table 1) is used to indicate that the channel is occupied in the entire time slot and the UE can send uplink data in the entire time slot; in a switching point, D+X+U (format 19-45 in Table 1) or X+U (format 8-15 in Table 1) is used to indicate that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol; and in two switching points (format 46-55 in Table 1), it is indicated that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol.
- D+X+U format 19-45 in Table 1
- the channel release information includes: when a length of the absolute time corresponding to the number of time slot formats in the PDCCH indicating a corresponding cell exceeds the maximum channel occupation time, using a specific time slot format to indicate that the MCOT is exceeded or channel release.
- all X (format 2 in Table 1) is used to indicate that the MCOT is exceeded or channel release in the entire time slot; and DL+X (format 3-7, 16, 17 and 18 in Table 1) is used to indicate that the MCOT is exceeded or channel release in some time slots.
- the time slot format of the PDCCH indicates a plurality of serving cells
- a specific time slot format is used to indicate no channel occupation, the MCOT is exceeded, or channel release.
- all X format 2 in Table 1 is used to indicate that a corresponding serving cell has not been accessed successfully or the channel is released.
- a method for notifying channel occupation time is provided, wherein the method applies to a user equipment,.
- the method includes S 21 , S 22 and S 23 .
- the UE receives a time slot format information sent by a base station through a PDCCH after the base station accesses a channel successfully, wherein the time slot format information indicates one or more time slots of one or more cells.
- the UE receives the time slot format information sent by the base station through DCI 2-0 of the PDCCH, wherein the time slot format information indicates one or more time slots of one or more cells.
- the UE acquires channel occupation information and channel release information.
- the UE After receiving the DCI 2-0 of the PDCCH, the UE acquires the channel occupation information and the channel release information according to the slot format information and acquires at least one of the following information: whether the gNB accesses the channel successfully or not, a length of channel occupation time, a timing for channel release, and an allocation information of downlink symbols and uplink symbols in each time slot during the channel occupation time.
- the UE performs downlink reception, uplink transmission or channel access in symbols of each time slot.
- a method for notifying channel occupation time is provided.
- the base station After accessing the channel successfully, the base station sends the time slot format information through the PDCCH to the UE, so as to notify the UE the channel occupation information and the channel release information.
- the UE performs downlink reception, uplink transmission or channel access in symbols of each time slot, thereby sharing the channel with the UE effectively and improving channel occupation rate and system performance.
- the UE performing downlink reception, uplink transmission or channel access in symbols of each time slot includes: in the downlink symbols indicating time slot format, the UE receives a downlink signal or channel; in the uplink symbols indicating the slot format, the UE performs channel access according to Type 2 channel access process (short LBT), or sending an uplink channel or signal directly without performing LBT, wherein the uplink channel or signal may be a periodic signal, such as a periodic Sounding Reference Signal (SRS), a Physical Uplink Control Channel (PUCCH), a configured uplink authorized transmission, or it may also be an uplink channel configured by a high-level signaling, such as a Physical Random-Access Channel (PRACH); and in the uplink symbols and flexible symbols indicating the slot format, the UE performs channel access according to Type 2 channel access process (short LBT), or sending a dynamic uplink channel or signal triggered by a physical layer signaling directly without performing LBT, for example, a nonperi
- a device for notifying channel occupation time is provided, wherein the device is located at a base station.
- the device includes:
- an access unit 11 configured to perform LBT and conduct channel access in an unlicensed spectrum
- a transmission unit 12 when a channel is accessed successfully, configured to send a slot format information which indicates one or more time slots of one or more cells to a UE through a PDCCH, so as to notify the UE that the base station accesses the channel and occupies the channel.
- a device for notifying channel occupation time is provided.
- the base station sends the time slot format information through the PDCCH to the UE, so as to notify the UE of the channel occupation situation. Therefore, after accessing the channel successfully, the base station can share the channel with the UE effectively, thereby improving channel occupation rate and system performance.
- the transmission unit 12 is configured to send the slot format information which indicates one or more time slots of one or more cells to the UE through DCI 2-0 of the PDCCH.
- the access unit 11 performs channel access according to Type 1.
- a transmission period of the PDCCH or an absolute time corresponding to a number of time slot formats indicating a cone ding cell in the PDCCH is less than or equal to a current maximum channel occupation time, all the time slot format information in the PDCCH is channel occupation information.
- the time slot format information in the PDCCH includes channel occupation information and channel release information.
- the channel occupation information includes: when an absolute time corresponding to a number of all time slot formats indicating a corresponding cell in the PDCCH is less than or equal to the maximum channel occupation time, or an absolute time corresponding to a number of partial time slot formats indicating a corresponding cell is less than or equal to the maximum channel occupation time, using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation.
- using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation includes: using all D to indicate that the channel is occupied in an entire time slot, the base station sends downlink data in the entire time slot, and the UE needs to receive; using all U to indicate that the channel is occupied in the entire time slot and the UE can send uplink data in the entire time slot; in a switching point, using D+X+U or X+U to indicate that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol; and in two switching points, indicating that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol.
- the channel release information includes: when a length of the absolute time corresponding to the number of time slot formats in the PDCCH indicating a corresponding cell exceeds the maximum channel occupation time, using a specific time slot format to indicate that the maximum channel occupation time is exceeded or channel release.
- using a specific time slot format to indicate that the maximum channel occupation time is exceeded or channel release includes: using all X to indicate that the maximum channel occupation time is exceeded or channel release in the entire time slot; using DL+X to indicate that the maximum channel occupation time is exceeded or channel release in some time slots; and using all X to indicate that a corresponding cell has not been accessed successfully or the channel is released.
- the device provided in the embodiments described above can be used to execute the technical solutions provided in the above method embodiments which applies to a base station.
- the implementation principles and technical effects are similar, which will not be described in detail herein again.
- a device for notifying channel occupation time is provided, wherein the device is located at a user equipment.
- the device includes:
- a reception unit 21 configured to receive a slot format information which is sent by a base station through a PDCCH after accessing a channel successfully in an unlicensed spectrum, wherein the slot format information indicates one or more time slots of one or more cells;
- an acquiring unit 22 configured to acquire channel occupation information and channel release information according to the time slot format information
- a processing unit 23 configured to perform downlink reception, uplink transmission or channel access in symbols of each time slot, according to the channel occupation information and the channel release information.
- a device for notifying channel occupation time After accessing the channel successfully, the base station sends the time slot format information through the PDCCH to the UE, so as to notify the UE the channel occupation information and the channel release information. According to the channel occupation information and the channel release information, the UE performs downlink reception, uplink transmission or channel access in symbols of each time slot, thereby sharing the channel with the UE effectively and improving channel occupation rate and system performance.
- the acquiring unit 22 acquires at least one of the following information: whether the base station accesses the channel successfully or not, a length of channel occupation time, a timing for channel release, and an allocation information of downlink symbols and uplink symbols in each time slot during the channel occupation time.
- the processing unit 23 receives a downlink signal or channel in the downlink symbols indicating time slot format.
- the processing unit 23 performs channel access according to Type channel access process, or sends an uplink channel or signal directly without performing LBT.
- the processing unit 23 performs channel access according to Type 2 channel access process, or sends a dynamic uplink channel or signal triggered by a physical layer signaling directly without performing LBT.
- the device provided in the embodiments described above can be used to execute the technical solutions provided in the above method embodiments which applies to a user equipment.
- the implementation principles and technical effects are similar, which will not be described in detail herein again.
- a base station having a device for notifying channel occupation time described above wherein the device is located at the base station.
- a user equipment having a device for notifying channel occupation time described above wherein the device is located at the user equipment.
- the computer program can be stored in a computer-readable storage medium, and when the computer program is executed, the computer program can include processes of the foregoing methods described in the embodiment.
- the storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), or a Random Access Memory (RAM), etc.
Abstract
A method and a device for notifying channel occupation time, a base station and a user equipment. The method which applies to a base station includes: in an unlicensed spectrum, performing LBT and channel access; and when a channel is accessed successfully, sending a time slot format information which indicates one or more time slots of one or more cells to a UE through a PDCCH. The method which applies to a user equipment includes: in an unlicensed spectrum, receiving time slot format information, sent by a base station via a PDCCH after channel access is successfully completed, indicating one or more time slots of one or more cells; acquiring channel occupation information and channel release information according to the time slot format information; and according to the channel occupation information and the channel release information, performing downlink reception, uplink transmission or channel access in symbols of each time slot.
Description
- This application is a Continuation Application of the U.S. patent application Ser. No. 16/969,544 filed on Aug. 12, 2020, which is the national phase of International Application No. PCT/CN2019/080926, filed on Apr. 2, 2019, which claims priority to Chinese Patent Application No. 201810290152.8, filed on Apr. 3, 2018, and entitled “METHOD AND DEVICE FOR NOTIFYING CHANNEL OCCUPATION TIME, AND BASE STATION AND USER EQUIPMENT”, the entire disclosure of which is incorporated herein.
- The present disclosure generally relates to wireless communication technology field, and more particularly, to a method and a device for notifying channel occupation time, a base station and a user equipment.
- In a 3rd Generation Partnership Project (3GPP) New Radio (NR) system, a radio frame with a time domain length of 10 ms is divided into 10 subframes with a same length of 1 ms, and each subframe may include multiple time slots according to according to different subcarrier intervals. Each time slot includes a certain number of symbols, and a number of symbols is determined by Cyclic Prefix (CP) type. Compared with a Long Term Evolution (LTE) special subframe structure which has a fixed 10 types of downlink, Guard Period (GP) and uplink symbols, Slot Format (SF) is introduced in a NR system, wherein each time slot includes a certain number of downlink, flexible (denoted by ‘X’) and uplink symbols. The SF may be configured in three ways: semi-static cell-level Radio Resource Control (RRC) signaling configuration; User Equipment (UE) specific RRC signaling configuration; and dynamically sending Slot Format Indication (SFI) to a group of UEs through Physical Downlink Control Channel (PDCCH), that is, dynamic slot format information. The SFI information carried on the PDCCH may indicate format of one or more time slots on one or more carriers. After the SFI is detected, the UE obtains an index information and the index information points to a UE-specific table. The UE specific table tells which symbols in the time slot are uplink (UL), which symbols are downlink (DL), and which symbols are “flexible”. The UE-specific table is configured and combined in a single-slot-format table. The single-slot-format table includes all time slot formats (less than 256) supported in NR. It has been determined that time slot format in the single-slot-format table (as shown in Table 1) includes at most two downlink/uplink (D/U) switching points in each time slot.
-
TABLE 1 for- symbol number in a time slot mat 0 1 2 3 4 5 6 7 8 9 10 11 12 13 0 D D D D D D D D D D D D D D 1 U U U U U U U U U U U U U U 2 X X X X X X X X X X X X X X 3 D D D D D D D D D D D D D X 4 D D D D D D D D D D D D X X 5 D D D D D D D D D D D X X X 6 D D D D D D D D D D X X X X 7 D D D D D D D D D X X X X X 8 X X X X X X X X X X X X X U 9 X X X X X X X X X X X X U U 10 X U U U U U U U U U U U U U 11 X X U U U U U U U U U U U U 12 X X X U U U U U U U U U U U 13 X X X X U U U U U U U U U U 14 X X X X X U U U U U U U U U 15 X X X X X X U U U U U U U U 16 D X X X X X X X X X X X X X 17 D D X X X X X X X X X X X X 18 D D D X X X X X X X X X X X 19 D X X X X X X X X X X X X U 20 D D X X X X X X X X X X X U 21 D D D X X X X X X X X X X U 22 D X X X X X X X X X X X U U 23 D D X X X X X X X X X X U U 24 D D D X X X X X X X X X U U 25 D X X X X X X X X X X U U U 26 D D X X X X X X X X X U U U 27 D D D X X X X X X X X U U U 28 D D D D D D D D D D D D X U 29 D D D D D D D D D D D X X U 30 D D D D D D D D D D X X X U 31 D D D D D D D D D D D X U U 32 D D D D D D D D D D X X U U 33 D D D D D D D D D X X X U U 34 D X U U U U U U U U U U U U 35 D D X U U U U U U U U U U U 36 D D D X U U U U U U U U U U 37 D X X U U U U U U U U U U U 38 D D X X U U U U U U U U U U 39 D D D X X U U U U U U U U U 40 D X X X U U U U U U U U U U 41 D D X X X U U U U U U U U U 42 D D D X X X U U U U U U U U 43 D D D D D D D D D X X X X U 44 D D D D D D X X X X X X U U 45 D D D D D D X X U U U U U U 46 D D D D D X U D D D D D X U 47 D D X U U U U D D X U U U U 48 D X U U U U U D X U U U U U 49 D D D D X X U D D D D X X U 50 D D X X U U U D D X X U U U 51 D X X U U U U D X X U U U U 52 D X X X X X U D X X X X X U 53 D D X X X X U D D X X X X U 54 X X X X X X X D D D D D D D 55 D D X X X U U U D D D D D D 56- Reserved 255 - Details are described as follows.
- 1. There is no switching point in a time slot: 14 downlink symbols (as shown in
FIG. 1 ), or 14 Unknown symbols (as shown inFIG. 3 ), or 14 uplink symbols (as shown inFIG. 2 ). - 2. There is one D/U switching point in a time slot (as shown in
FIG. 4 ): a time slot starts with zero or more DL symbols and ends with zero or more UL symbols, with Unknown symbols in the middle which has at least one Unknown symbol, and at least one DL symbol or at least one UL symbol. - 3. There is two D/U switching points in a time slot (as shown in
FIG. 5 ): first seven symbols of the time slot start with zero or more DL symbols and end with at least one UL symbol in Symbol 6, the middle of which is Unknown symbols; and last seven symbols start with zero or more DL symbols, end with zero or more UL symbols, and has zero or more Unknown symbols in the middle. - 3GPP standards organizations are researching on how to deploy NR networks on unlicensed spectrum, so as to achieve purposes of fair and effective use of unlicensed spectrum and improve data transmission rate in a NR system. There are three ways to use unlicensed spectrum in a NR system: first, a NR cell in an unlicensed spectrum is used as a primary cell; second, a UE accesses a NR cell in an unlicensed spectrum through a LTE cell; and third, a UE accesses a NR cell in an unlicensed spectrum through a NR cell. In the last two ways, licensed spectrum and unlicensed spectrum can be combined in a way that is similar to carrier aggregation, that is, a UE and a gNB (which means a 5G base station) may work in both licensed spectrum and unlicensed spectrum.
- In a 3GPP LTE system, a Listen-Before-Talk (LBT) process is used to achieve coexistence of Licensed Assisted Access (LAA) of different operators and other systems in unlicensed spectrum. In the LBT process, nodes in the unlicensed spectrum determines whether a current channel is available or not before data transmission through Clear Channel Assessment (CCA). Thus energy detection is used to determine whether the channel is occupied or not in any LBT process. Some regional regulations stipulate an energy detection threshold. If energy received by a node is higher than this threshold, the channel is considered as busy. There are two channel access processes supported in LTE License Assisted Access (LAA) downlink transmission: a channel access process (that is also called Cat 4 channel access) that needs to send Physical Downlink Shared Channel (PDSCH)/PDCCH/enhanced PDCCH (EPDCCH), and a channel access process (that is also called Cat 2 channel access) that needs to send discovery reference signals. Similarly, these two channel access processes are also supported in LAA uplink transmission, which are called Type 1 channel access and Type 2 channel access. Type 1 channel access is based on Cat 4 channel access, and Type 2 channel access is based on a fixed time length (Cat 2) channel access which has at least 25 us of LBT before transmission.
- Type 1: a channel is detected to determine if it is in an idle state during a defer duration Td, the value of N in Step 4 is 0, and N increases with a sensing slot duration. Steps in Type 1 channel access process are described as follows.
- Step 1: set N=Ninit, where Ninit is a random number uniformly distributed between 0 and CWp, and go to step 4.
- Step 2: if N>0 and eNB/gNB chooses to decrement a counter, set N=N−1.
- Step 3: sense the channel for an additional sensing slot duration, and if the additional sensing slot duration is idle, go to step 4; otherwise, go to step 5.
- Step 4: if N=0, stop; otherwise, go to Step 2.
- Step 5: sense the channel for an additional defer duration Td until either a busy sensing slot is detected within the additional defer duration Td or all sensing slots of the additional defer duration Td are detected to be idle.
- Step 6: if the channel is sensed to be idle during all the sensing slot durations of the additional defer duration Td, go to step 4; otherwise, go to step 5.
- In the channel access process described above, different Maximum Channel Occupy Time (MCOT) is required according to different channel access priorities. The MCOT which means a maximum available time period of the channel, is shown as Tmcot,p in Table 2.
-
TABLE 2 Channel Access allowed Priority CWp Class (p) mp CWmin, p CWmax, p Tmcot, p sizes 1 1 3 7 2 ms {3, 7} 2 1 7 15 3 ms {7, 15} 3 3 15 63 8 or 10 ms {15, 31, 63} 4 7 1 1023 8 or 10 ms {15, 31, 63, 127, 255, 511, 1023} - Type 2: if the channel is detected for at least Tdrs=25 us, average energy is lower XThresh, and transmission time is less than 1 ms, downlink or uplink data can be sent on a channel transmitted by an unauthorized cell.
- The two processes described above may be referred to as channel access Type 1 and Type 2 hereinafter.
- In an unlicensed spectrum, after finishing LBT and accessing a channel successfully, a base station cannot notify a UE of the channel occupation situation, thus it cannot share the channel with the UE effectively.
- Embodiments of the present disclosure provide a method and a device for notifying channel occupation time, a base station and a user equipment, wherein a time slot format information is sent through a PDCCH, so as to notify a UE of the channel occupation situation, thereby sharing the channel with the UE effectively and improving channel occupation rate.
- In an embodiment of the present disclosure, a method for notifying channel occupation time is provided, wherein the method applies to a base station, including: in an unlicensed spectrum, performing Listen-Before-Talk (LBT) and conducting channel access; and when a channel is accessed successfully, sending a time slot format information which indicates one or more time slots of one or more cells to a UE through a PDCCH, so as to notify the UE that the base station accesses the channel and occupies the channel.
- In some embodiments, sending a time slot format information which indicates one or more time slots of one or more cells to a UE through a PDCCH includes: sending the time slot format information which indicates one or more time slots of one or more cells to the UE through Downlink Control Information (DCI) 2-0 of the PDCCH.
- In some embodiments, performing Listen-Before-Talk (LBT) and conducting channel access includes: conducting channel access according to Type 1.
- In some embodiments, if a transmission period of the PDCCH or an absolute time corresponding to a number of time slot formats indicating a corresponding cell in the PDCCH is less than or equal to a current maximum channel occupation time, all the time slot format information in the PDCCH is channel occupation information.
- In some embodiments, if the transmission period of the PDCCH or the absolute time corresponding to the number of time slot formats indicating a corresponding cell in the PDCCH is greater than the current maximum channel occupation time, the time slot format information in the PDCCH includes channel occupation information and channel release information.
- In some embodiments, the channel occupation information includes: when an absolute time corresponding to a number of all time slot formats indicating a corresponding cell in the PDCCH is less than or equal to the maximum channel occupation time, or an absolute time corresponding to a number of partial time slot formats indicating a corresponding cell is less than or equal to the maximum channel occupation time, using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation.
- In some embodiments, using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation includes: using all D to indicate that the channel is occupied in an entire time slot, the base station sends downlink data in the entire time slot, and the UE needs to receive; using all U to indicate that the channel is occupied in the entire time slot and the UE can send uplink data in the entire time slot; in a switching point, using D+X+U or X+U to indicate that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol; and in two switching points, indicating that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol.
- In some embodiments, the channel release information includes: when a length forma of the absolute time corresponding to the number of time slot formats in the PDCCH indicating a corresponding cell exceeds the maximum channel occupation time, using a specific time slot format to indicate that the maximum channel occupation tine is exceeded or channel release.
- In some embodiments, using a specific time slot format to indicate that the maximum channel occupation time is exceeded or channel release includes: using all X to indicate that the maximum channel occupation time is exceeded or channel release in the entire time slot; using DL+X to indicate that the maximum channel occupation time is exceeded or channel release in some time slots; and using all X to indicate that a corresponding cell has not been accessed successfully or the channel is released.
- In an embodiment of the present disclosure, a method for notifying channel occupation time is provided, wherein the method applies to a user equipment, including: in an unlicensed spectrum, receiving a time slot format information sent by a base station through a PDCCH after the base station accesses a channel successfully, wherein the time slot format information indicates one or more time slots of one or more cells; according to the slot format information, acquiring channel occupation information and channel release information; and according to the channel occupation information and the channel release information, performing downlink reception, uplink transmission or channel access in symbols of each time slot.
- In some embodiments, according to the slot format information, acquiring channel occupation information and channel release information includes: acquiring at least one of the following information: whether the base station accesses the channel successfully or not, a length of channel occupation time, a timing for channel release, and an allocation information of downlink symbols and uplink symbols in each time slot during the channel occupation time.
- In some embodiments, according to the channel occupation information and the channel release information, performing downlink reception, uplink transmission or channel access in symbols of each time slot includes: receiving a downlink signal or channel in the downlink symbols indicating time slot format.
- In some embodiments, according to the channel occupation information and the channel release information, performing downlink reception, uplink transmission or channel access in symbols of each time slot includes: in the uplink symbols indicating time slot format, performing channel access according to Type 2 channel access process, or sending an uplink channel or signal directly without performing LBT.
- In some embodiments, according to the channel occupation information and the channel release information, performing downlink reception, uplink transmission or channel access in symbols of each time slot includes: in the uplink symbols and flexible symbols indicating time slot format, performing channel access according to Type 2 channel access process, or sending a dynamic uplink channel or signal triggered by a physical layer signaling directly without performing LBT.
- In an embodiment of the present disclosure, a device for notifying channel occupation time is provided, wherein the device is located at a base station, including: an access unit, configured to perform LBT and conduct channel access in an unlicensed spectrum; and a transmission unit, when a channel is accessed successfully, configured to send a slot format information which indicates one or more time slots of one or more cells to a UE through a PDCCH, so as to notify the UE that the base station accesses the channel and occupies the channel.
- In some embodiments, the transmission unit is configured to send the slot format information which indicates one or more time slots of one or more cells to the UE through DCI 2-0 of the PDCCH.
- In some embodiments, the access unit performs channel access according to Type 1.
- In some embodiments, if a transmission period of the PDCCH or an absolute time corresponding to a number of time slot formats indicating a corresponding cell in the PDCCH is less than or equal to a current maximum channel occupation time, all the time slot format information in the PDCCH is channel occupation information.
- In some embodiments, if the transmission period of the PDCCH or the absolute time corresponding to the number of time slot formats indicating a corresponding cell in the PDCCH is greater than the current maximum channel occupation time, the time slot format information in the PDCCH includes channel occupation information and channel release information.
- In some embodiments, the channel occupation information includes: when an absolute time corresponding to a number of all time slot formats indicating a corresponding cell in the PDCCH is less than or equal to the maximum channel occupation time, or an absolute time corresponding to a number of partial time slot formats indicating a corresponding cell is less than or equal to the maximum channel occupation time, using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation.
- In some embodiments, using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation includes: using all D to indicate that the channel is occupied in an entire time slot, the base station sends downlink data in the entire time slot, and the UE needs to receive; using all U to indicate that the channel is occupied in the entire time slot and the UE can send uplink data in the entire time slot; in a switching point, using D+X+U or X+U to indicate that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol; and in two switching points, indicating that the channel is occupied in the entire slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol.
- In some embodiments, the channel release information includes: when a length of the absolute time corresponding to the number of time slot formats in the PDCCH indicating corresponding cell exceeds the maximum channel occupation time, using a specific time slot format to indicate that the maximum channel occupation time is exceeded or channel release.
- In some embodiments, using a specific time slot format to indicate that the maximum channel occupation time is exceeded or channel release includes: using all X to indicate that the maximum channel occupation time is exceeded or channel release in the entire time slot; using DL+X to indicate that the maximum channel occupation time is exceeded or channel release in some time slots; and using all X to indicate that a corresponding cell has not been accessed successfully or the channel is released.
- In an embodiment of the present disclosure, a device for notifying channel occupation time is provided, wherein the device is located at a user equipment, including: a reception unit, configured to receive a slot format information which is sent by a base station through a PDCCH after accessing a channel successfully in an unlicensed spectrum, wherein the slot format information indicates one or more time slots of one or more cells; an acquiring unit, configured to acquire channel occupation information and channel release information according to the time slot format information; and a processing unit, configured to perform downlink reception, uplink transmission or channel access in symbols of each time slot, according to the channel occupation information and the channel release information.
- In some embodiments, the acquiring unit acquires at least one of the following information: whether the base station accesses the channel successfully or not, a length of channel occupation time, a timing for channel release, and an allocation information of downlink symbols and uplink symbols in each time slot during the channel occupation time.
- In some embodiments, the processing unit receives a downlink signal or channel in the downlink symbols indicating time slot format.
- In some embodiments, in the uplink symbols indicating time slot format, the processing unit performs channel access according to Type 2 channel access process, or sends an uplink channel or signal directly without performing LBT.
- In some embodiments, in the uplink symbols and flexible symbols indicating time slot format, the processing unit performs channel access according to Type 2 channel access process, or sends a dynamic uplink channel or signal triggered by a physical layer signaling directly without performing LBT.
- In an embodiment of the present disclosure, a base station having a device for notifying channel occupation time described above is provided, wherein the device is located at the base station.
- In an embodiment of the present disclosure, a user equipment having a device for notifying channel occupation time described above is provided, wherein the device is located at the user equipment.
- According to embodiments of the present disclosure described above, a method and a device for notifying channel occupation time, a base station and a user equipment are provided. After accessing a channel successfully, the base station sends a time slot format information through a PDCCH to the UE, so as to notify the UE of the channel occupation situation, thereby sharing the channel with the UE effectively and improving channel occupation rate and system performance.
-
FIGS. 1 to 5 are exemplary settings of 14 symbols in a time slot according to prior art; -
FIG. 6 schematically illustrates a flow chart of a method for notifying channel occupation time according to an embodiment; -
FIG. 7 schematically illustrates a flow chart of a method for notifying channel occupation time according to another embodiment; -
FIG. 8 schematically illustrates a structural diagram of a device for notifying channel occupation time according to an embodiment; and -
FIG. 9 schematically illustrates a structural diagram of a device for notifying channel occupation time according to another embodiment. - To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following clearly describes the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall be within the protection scope of the present invention.
- Embodiments of the present disclosure provide a method for notifying channel occupation time, wherein the method applies to a base station. Referring to
FIG. 6 , the method includes S11 and S12. - S11: in an unlicensed spectrum, the base station performs Listen-Before-Talk (LBT) and conducts channel access.
- First, a search space carrying DCI 2-0 in a PDCCH is sent according to a high-level signaling configuration, which includes a transmission period and an offset. A UE periodically monitors the PDCCH according to the configuration. the DCI 2-0 may include time slot formats of multiple slots of multiple cells, wherein a number of cells and a number of slots in each cell are configured by the high-level signaling.
- S12: when a channel is accessed successfully, the base station sends a time slot format information which indicates one or more time slots of one or more cells to the UE through the PDCCH, so as to notify the UE that the base station accesses the channel and occupies the channel.
- Specifically, the base station sends the time slot format information which indicates one or more time slots of one or more cells to the UE through DCI 2-0 of the PDCCH.
- According to the embodiment of the present disclosure described above, a method for notifying channel occupation time is provided. The base station sends the time slot format information through the PDCCH to the UE, so as to notify the UE of the channel occupation situation. Therefore, after accessing the channel successfully, the base station can share the channel with the UE effectively, thereby improving channel occupation rate and system performance.
- In some embodiments, only after a gNB access the channel according to Type 1, it can send the time slot format information which indicates one or more time slots of one or more cells to the UE.
- When the gNB uses a Type 1 channel to access one serving cell or a plurality of serving cells, duration of Maximum Channel Occupy Time (MCOT) is determined according to channel access priority class, and transmission period of the PDCCH is configured semi-statically.
- In some embodiments, if the transmission period of the PDCCH or an absolute time corresponding to a number of time slot formats indicating a corresponding cell in the PDCCH is less than or equal to a current MCOT, all the time slot format information in the PDCCH is channel occupation information.
- In some embodiments, if the transmission period of the PDCCH or the absolute time corresponding to the number of time slot formats indicating a corresponding cell in the PDCCH is greater than the current MCOT, the time slot format information in the PDCCH includes channel occupation information and channel release information.
- In some embodiments, the channel occupation information includes: when an absolute time corresponding to a number of all time slot formats indicating a corresponding cell in the PDCCH is less than or equal to the MCOT, or an absolute time corresponding to a number of partial time slot formats indicating a corresponding cell is less than or equal to the MCOT, using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation.
- In some embodiments, all D (format 0 in Table 1) is used to indicate that the channel is occupied in an entire time slot, the gNB sends downlink data in the entire time slot, and the UE needs to receive; all U (format 1 in Table 1) is used to indicate that the channel is occupied in the entire time slot and the UE can send uplink data in the entire time slot; in a switching point, D+X+U (format 19-45 in Table 1) or X+U (format 8-15 in Table 1) is used to indicate that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol; and in two switching points (format 46-55 in Table 1), it is indicated that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol.
- In some embodiments, the channel release information includes: when a length of the absolute time corresponding to the number of time slot formats in the PDCCH indicating a corresponding cell exceeds the maximum channel occupation time, using a specific time slot format to indicate that the MCOT is exceeded or channel release.
- In some embodiments, all X (format 2 in Table 1) is used to indicate that the MCOT is exceeded or channel release in the entire time slot; and DL+X (format 3-7, 16, 17 and 18 in Table 1) is used to indicate that the MCOT is exceeded or channel release in some time slots.
- When the time slot format of the PDCCH indicates a plurality of serving cells, if some of the serving cells are not accessed successfully, a specific time slot format is used to indicate no channel occupation, the MCOT is exceeded, or channel release. Specifically, all X (format 2 in Table 1) is used to indicate that a corresponding serving cell has not been accessed successfully or the channel is released.
- In an embodiment of the present disclosure, a method for notifying channel occupation time is provided, wherein the method applies to a user equipment,. Referring to
FIG. 7 , the method includes S21, S22 and S23. - S21: in an unlicensed spectrum, the UE receives a time slot format information sent by a base station through a PDCCH after the base station accesses a channel successfully, wherein the time slot format information indicates one or more time slots of one or more cells.
- Specifically, the UE receives the time slot format information sent by the base station through DCI 2-0 of the PDCCH, wherein the time slot format information indicates one or more time slots of one or more cells.
- S22: according to the slot format information, the UE acquires channel occupation information and channel release information.
- Specifically, after receiving the DCI 2-0 of the PDCCH, the UE acquires the channel occupation information and the channel release information according to the slot format information and acquires at least one of the following information: whether the gNB accesses the channel successfully or not, a length of channel occupation time, a timing for channel release, and an allocation information of downlink symbols and uplink symbols in each time slot during the channel occupation time.
- S23: according to the channel occupation information and the channel release information, the UE performs downlink reception, uplink transmission or channel access in symbols of each time slot.
- According to the embodiment of the present disclosure described above, a method for notifying channel occupation time is provided. After accessing the channel successfully, the base station sends the time slot format information through the PDCCH to the UE, so as to notify the UE the channel occupation information and the channel release information. According to the channel occupation information and the channel release information, the UE performs downlink reception, uplink transmission or channel access in symbols of each time slot, thereby sharing the channel with the UE effectively and improving channel occupation rate and system performance.
- In some embodiments, according to the channel occupation information and the channel release information, the UE performing downlink reception, uplink transmission or channel access in symbols of each time slot includes: in the downlink symbols indicating time slot format, the UE receives a downlink signal or channel; in the uplink symbols indicating the slot format, the UE performs channel access according to Type 2 channel access process (short LBT), or sending an uplink channel or signal directly without performing LBT, wherein the uplink channel or signal may be a periodic signal, such as a periodic Sounding Reference Signal (SRS), a Physical Uplink Control Channel (PUCCH), a configured uplink authorized transmission, or it may also be an uplink channel configured by a high-level signaling, such as a Physical Random-Access Channel (PRACH); and in the uplink symbols and flexible symbols indicating the slot format, the UE performs channel access according to Type 2 channel access process (short LBT), or sending a dynamic uplink channel or signal triggered by a physical layer signaling directly without performing LBT, for example, a nonperiodic SRS, a dynamic Physical Uplink Shared Channel (PUSCH).
- In an embodiment of the present disclosure, a device for notifying channel occupation time is provided, wherein the device is located at a base station. Referring to
FIG. 8 , the device includes: - an
access unit 11, configured to perform LBT and conduct channel access in an unlicensed spectrum; and - a
transmission unit 12, when a channel is accessed successfully, configured to send a slot format information which indicates one or more time slots of one or more cells to a UE through a PDCCH, so as to notify the UE that the base station accesses the channel and occupies the channel. - According to the embodiment of the present disclosure described above, a device for notifying channel occupation time is provided. The base station sends the time slot format information through the PDCCH to the UE, so as to notify the UE of the channel occupation situation. Therefore, after accessing the channel successfully, the base station can share the channel with the UE effectively, thereby improving channel occupation rate and system performance.
- In some embodiments, the
transmission unit 12 is configured to send the slot format information which indicates one or more time slots of one or more cells to the UE through DCI 2-0 of the PDCCH. - In some embodiments, the
access unit 11 performs channel access according to Type 1. - In some embodiments, if a transmission period of the PDCCH or an absolute time corresponding to a number of time slot formats indicating a cone ding cell in the PDCCH is less than or equal to a current maximum channel occupation time, all the time slot format information in the PDCCH is channel occupation information.
- In some embodiments if the transmission period of the PDCCH or the absolute time corresponding to the number of time slot formats indicating a corresponding cell in the PDCCH is greater than the current maximum channel occupation time, the time slot format information in the PDCCH includes channel occupation information and channel release information.
- In some embodiments, the channel occupation information includes: when an absolute time corresponding to a number of all time slot formats indicating a corresponding cell in the PDCCH is less than or equal to the maximum channel occupation time, or an absolute time corresponding to a number of partial time slot formats indicating a corresponding cell is less than or equal to the maximum channel occupation time, using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation.
- In some embodiments, using a specific time slot format to indicate it is within the maximum channel occupation time or channel occupation includes: using all D to indicate that the channel is occupied in an entire time slot, the base station sends downlink data in the entire time slot, and the UE needs to receive; using all U to indicate that the channel is occupied in the entire time slot and the UE can send uplink data in the entire time slot; in a switching point, using D+X+U or X+U to indicate that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol; and in two switching points, indicating that the channel is occupied in the entire time slot, wherein the UE can send uplink data on an UL symbol, send downlink data on a DL symbol, and perform channel access on an X symbol.
- In some embodiments, the channel release information includes: when a length of the absolute time corresponding to the number of time slot formats in the PDCCH indicating a corresponding cell exceeds the maximum channel occupation time, using a specific time slot format to indicate that the maximum channel occupation time is exceeded or channel release.
- In some embodiments, using a specific time slot format to indicate that the maximum channel occupation time is exceeded or channel release includes: using all X to indicate that the maximum channel occupation time is exceeded or channel release in the entire time slot; using DL+X to indicate that the maximum channel occupation time is exceeded or channel release in some time slots; and using all X to indicate that a corresponding cell has not been accessed successfully or the channel is released.
- The device provided in the embodiments described above can be used to execute the technical solutions provided in the above method embodiments which applies to a base station. The implementation principles and technical effects are similar, which will not be described in detail herein again.
- In an embodiment of the present disclosure, a device for notifying channel occupation time is provided, wherein the device is located at a user equipment. Referring to
FIG. 9 , the device includes: - a
reception unit 21, configured to receive a slot format information which is sent by a base station through a PDCCH after accessing a channel successfully in an unlicensed spectrum, wherein the slot format information indicates one or more time slots of one or more cells; - an acquiring
unit 22, configured to acquire channel occupation information and channel release information according to the time slot format information; and - a
processing unit 23, configured to perform downlink reception, uplink transmission or channel access in symbols of each time slot, according to the channel occupation information and the channel release information. - According to the embodiment of the present disclosure described above, a device for notifying channel occupation time is provided. After accessing the channel successfully, the base station sends the time slot format information through the PDCCH to the UE, so as to notify the UE the channel occupation information and the channel release information. According to the channel occupation information and the channel release information, the UE performs downlink reception, uplink transmission or channel access in symbols of each time slot, thereby sharing the channel with the UE effectively and improving channel occupation rate and system performance.
- In some embodiments, the acquiring
unit 22 acquires at least one of the following information: whether the base station accesses the channel successfully or not, a length of channel occupation time, a timing for channel release, and an allocation information of downlink symbols and uplink symbols in each time slot during the channel occupation time. - In some embodiments, the
processing unit 23 receives a downlink signal or channel in the downlink symbols indicating time slot format. - In some embodiments, in the uplink symbols indicating the slot format, the
processing unit 23 performs channel access according to Type channel access process, or sends an uplink channel or signal directly without performing LBT. - In some embodiments, in the uplink symbols and flexible symbols indicating the slot format, the
processing unit 23 performs channel access according to Type 2 channel access process, or sends a dynamic uplink channel or signal triggered by a physical layer signaling directly without performing LBT. - The device provided in the embodiments described above can be used to execute the technical solutions provided in the above method embodiments which applies to a user equipment. The implementation principles and technical effects are similar, which will not be described in detail herein again.
- In an embodiment of the present disclosure, a base station having a device for notifying channel occupation time described above is provided, wherein the device is located at the base station.
- In an embodiment of the present disclosure, a user equipment having a device for notifying channel occupation time described above is provided, wherein the device is located at the user equipment.
- Those skilled in the art can understand that a part or all of the methods described in the embodiments of the present disclosure can be performed by a computer program instructing a related hardware. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed, the computer program can include processes of the foregoing methods described in the embodiment. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), or a Random Access Memory (RAM), etc.
- Although the present disclosure has been disclosed above with reference to preferred embodiments thereof, it should be understood that the disclosure is presented by way of example only, and not limitation. Those skilled in the art can modify and vary the embodiments without departing from the spirit and scope of the present disclosure.
Claims (18)
1. A method for notifying channel occupation time, comprising:
receiving, by a User equipment (UE), Downlink Control Information (DCI) 2-0 through Physical Downlink Control Channel (PDCCH), wherein the DCI 2-0 comprises time slot format information, and the time slot format information indicates one or more time slots of one or more cells;
acquiring, by the UE, a length of channel occupation time and an allocation information of downlink symbols, uplink symbols and flexible symbols in each time slot during the channel occupation time based on the DCI 2-0; and
performing downlink reception, uplink transmission or channel access, by the UE, in symbols of each time slot based on the allocation information.
2. The method according to claim 1 , wherein said performing downlink reception, uplink transmission or channel access in symbols of each time slot based on the allocation information comprises:
in the uplink symbols of time slots, performing channel access according to Type 2 channel access process.
3. The method according to claim 1 , wherein said performing downlink reception, uplink transmission or channel access in symbols of each time slot based on the allocation information comprises:
in the uplink symbols of time slots, sending an uplink channel or signal directly without performing Listen-Before-Talk (LBT).
4. The method according to claim 1 , wherein said performing downlink reception, uplink transmission or channel access in symbols of each time slot based on the allocation information comprises:
in the downlink symbols of time slots, receiving a downlink signal or channel.
5. The method according to claim 1 , wherein said performing downlink reception, uplink transmission or channel access in symbols of each time slot based on the allocation information comprises:
in uplink symbols and flexible symbols of time slots, performing channel access according to Type 2 channel access process.
6. The method according to claim 1 , wherein said performing downlink reception, uplink transmission or channel access in symbols of each time slot based on the allocation information comprises:
in uplink symbols and flexible symbols of time slots, sending an uplink channel or signal directly without performing LBT.
7. A method for notifying channel occupation time, comprising:
performing, by a base station, access process; and
sending, by the base station, Downlink Control Information (DCI) 2-0 through Physical Downlink Control Channel (PDCCH), wherein the DCI comprises time slot format information, and the time slot format information indicates one or more time slots of one or more cells,
wherein the DCI 2-0 is used for a UE to acquire a length of channel occupation time and an allocation information of downlink symbols, uplink symbols and flexible symbols in each time slot during the channel occupation time based on the time slot format information and perform downlink reception, uplink transmission or channel access in symbols of each time slot based on the allocation information.
8. The method according to claim 7 , wherein the DCI 2-0 is used for the UE to:
perform channel access according to Type 2 channel access process in the uplink symbols of time slots.
9. The method according to claim 7 , wherein the DCI 2-0 is used for the UE to:
send an uplink channel or signal directly without performing Listen-Before-Talk (LBT) in the uplink symbols of time slots.
10. The method according to claim 7 , wherein the DCI 2-0 is used for the UE to:
receive a downlink signal or channel in the downlink symbols of time slots.
11. The method according to claim 7 , wherein the DCI 2-0 is used for the UE to:
perform channel access according to Type 2 channel access process in uplink symbols and flexible symbols of each time slots.
12. The method according to claim 7 , wherein the DCI 2-0 is used for the UE to:
send an uplink channel or signal directly without performing LBT in uplink symbols and flexible symbols of each time slots.
13. A user equipment for notifying channel occupation time, comprising a device configured to:
receive Downlink Control Information (DCI) 2-0 through Physical Downlink Control Channel (PDCCH), wherein the DCI 2-0 comprises time slot format information, and the time slot format information indicates one or more time slots of one or more cells;
acquire a length of channel occupation time and an allocation information of downlink symbols, uplink symbols and flexible symbols in each time slot during the channel occupation time based on the DCI 2-0; and
perform downlink reception, uplink transmission or channel access in symbols of each time slot based on the allocation information.
14. The user equipment according to the claim 13 , wherein the device further is configured to:
in the uplink symbols of time slots, perform channel access according to Type 2 channel access process.
15. The user equipment according to the claim 13 , wherein the device further is configured to:
send an uplink channel or signal directly without performing Listen-Before-Talk (LBT) in the uplink symbols of time slots.
16. The user equipment according to the claim 13 , wherein the device further is configured to:
send an uplink channel or signal directly without performing LBT in the uplink symbols of time slots.
17. The user equipment according to the claim 13 , wherein the device further is configured to:
perform channel access according to Type 2 channel access process in uplink symbols and flexible symbols of each time slots.
18. The user equipment according to the claim 11 , wherein the device further is configured to:
send an uplink channel or signal directly without performing LBT in uplink symbols and flexible symbols of each time slots.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17/954,212 US20230030623A1 (en) | 2018-04-03 | 2022-09-27 | Method and Device for Notifying Channel Occupation Time, and Base Station and User Equipment |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810290152.8A CN110351874B (en) | 2018-04-03 | 2018-04-03 | Method, device, base station and user equipment for notifying channel occupation time |
CNPCT/CN2019/080926 | 2018-04-03 | ||
CN201810290152.8 | 2018-04-03 | ||
PCT/CN2019/080926 WO2019192449A1 (en) | 2018-04-03 | 2019-04-02 | Method and device for notifying channel occupation time, and base station and user equipment |
US202016969544A | 2020-08-12 | 2020-08-12 | |
US17/954,212 US20230030623A1 (en) | 2018-04-03 | 2022-09-27 | Method and Device for Notifying Channel Occupation Time, and Base Station and User Equipment |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US202016969544A Continuation | 2018-04-03 | 2020-08-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20230030623A1 true US20230030623A1 (en) | 2023-02-02 |
Family
ID=68100093
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/969,544 Active 2039-04-04 US11477822B2 (en) | 2018-04-03 | 2019-04-02 | Method and device for notifying channel occupation time, and base station and user equipment |
US17/954,212 Abandoned US20230030623A1 (en) | 2018-04-03 | 2022-09-27 | Method and Device for Notifying Channel Occupation Time, and Base Station and User Equipment |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/969,544 Active 2039-04-04 US11477822B2 (en) | 2018-04-03 | 2019-04-02 | Method and device for notifying channel occupation time, and base station and user equipment |
Country Status (3)
Country | Link |
---|---|
US (2) | US11477822B2 (en) |
CN (1) | CN110351874B (en) |
WO (1) | WO2019192449A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019237360A1 (en) * | 2018-06-15 | 2019-12-19 | 北京小米移动软件有限公司 | Method and device for determining uplink and downlink switching points |
WO2020013536A1 (en) * | 2018-07-10 | 2020-01-16 | 엘지전자 주식회사 | Method for receiving slot format-related information in wireless communication system, and terminal using same |
KR102522568B1 (en) * | 2018-08-03 | 2023-04-17 | 삼성전자주식회사 | Method and apparatus for indicating channel occupancy time in wireless communication system |
CN109314989A (en) * | 2018-08-30 | 2019-02-05 | 北京小米移动软件有限公司 | Indicate, determine the method, apparatus and storage medium of the transmission direction of transmission unit |
US11089626B2 (en) * | 2018-09-26 | 2021-08-10 | Mediatek Singapore Pte. Ltd. | Listen before talk and channel access priority class for PUCCH in new radio unlicensed |
WO2021088064A1 (en) * | 2019-11-08 | 2021-05-14 | Oppo广东移动通信有限公司 | Information transmission method and apparatus, relevant device, and storage medium |
EP4014660A4 (en) * | 2019-11-17 | 2022-08-31 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Methods for channel access procedure switching |
WO2021098863A1 (en) * | 2019-11-21 | 2021-05-27 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Methods for pdcch monitoring, user equipment, base station, and computer readable media |
EP4072216A4 (en) * | 2019-12-06 | 2022-11-23 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Wireless communication method, terminal device, and network device |
US11497027B2 (en) * | 2020-01-21 | 2022-11-08 | Qualcomm Incorporated | Half duplex FDD user equipment operation |
WO2021203245A1 (en) * | 2020-04-07 | 2021-10-14 | 北京小米移动软件有限公司 | Method and apparatus for instructing to transmit data, communication device, and storage medium |
CN114727421A (en) * | 2021-01-05 | 2022-07-08 | 展讯通信(上海)有限公司 | Uplink signal transmission method and device, storage medium, terminal and base station |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015165084A1 (en) | 2014-04-30 | 2015-11-05 | 华为技术有限公司 | Method and device for scheduling unlicensed spectrum, and user equipment (ue) |
CN105636178A (en) * | 2014-11-07 | 2016-06-01 | 中兴通讯股份有限公司 | Unlicensed carrier occupation method and device |
US10271325B2 (en) * | 2014-11-17 | 2019-04-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Channel access in listen before talk systems |
CN106304386B (en) * | 2015-05-18 | 2020-11-06 | 上海诺基亚贝尔股份有限公司 | Method for triggering random backoff mechanism of LBT in LTE LAA |
CN106612557B (en) * | 2015-10-26 | 2020-02-18 | 中国移动通信集团公司 | Transmission method of downlink ACK/NACK information, base station and user equipment |
US10511413B2 (en) * | 2016-02-03 | 2019-12-17 | Ofinno, Llc | Hybrid automatic repeat requests in a wireless device and wireless network |
CN107295696B (en) * | 2016-04-01 | 2023-05-30 | 中兴通讯股份有限公司 | Channel access method, device, UE and base station |
KR102565631B1 (en) * | 2017-08-04 | 2023-08-10 | 엘지전자 주식회사 | Method and Apparatus for Autonomous Transmission |
US11546940B2 (en) * | 2018-01-10 | 2023-01-03 | Idac Holdings, Inc. | Channel access methods and listen-before-talk solutions for new radio operation in unlicensed bands |
-
2018
- 2018-04-03 CN CN201810290152.8A patent/CN110351874B/en active Active
-
2019
- 2019-04-02 WO PCT/CN2019/080926 patent/WO2019192449A1/en active Application Filing
- 2019-04-02 US US16/969,544 patent/US11477822B2/en active Active
-
2022
- 2022-09-27 US US17/954,212 patent/US20230030623A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
CN110351874A (en) | 2019-10-18 |
CN110351874B (en) | 2021-07-23 |
WO2019192449A1 (en) | 2019-10-10 |
US20210007143A1 (en) | 2021-01-07 |
US11477822B2 (en) | 2022-10-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20230030623A1 (en) | Method and Device for Notifying Channel Occupation Time, and Base Station and User Equipment | |
US20200305191A1 (en) | Method and apparatus for transmitting and receiving signal in communication system supporting unlicensed band | |
EP3440887B1 (en) | Systems and methods for self-deferral with downlink and uplink transmission opportunity sharing | |
CN106453182B (en) | Preamble sending method and device | |
US20190200386A1 (en) | Channel access method and device, user equipment, base station, and computer storage medium | |
US10548143B2 (en) | Methods, apparatuses, and systems for interference-dependent cross-carrier scheduling for license assisted access uplink | |
CN110999506A (en) | RACH procedures in unlicensed spectrum | |
US11844109B2 (en) | Controlling AUL transmissions when coexisting with scheduled UEs | |
US20210068135A1 (en) | User equipment and base station involved in transmission of uplink control data | |
US11206686B2 (en) | Listen before talk for uplink transmission | |
US11770718B2 (en) | Unlicensed channel sharing method and device, storage medium, terminal and base station | |
EP3768013A1 (en) | Terminal device, base station device, and communication method | |
WO2018196092A1 (en) | Random access method and device | |
US20200100093A1 (en) | Detecting or sending discovery signal, associated base station, and associated user equipment | |
CN113541907A (en) | Method and device for detecting downlink control information and user equipment | |
US20220022054A1 (en) | Method and device for determining occupied slots, storage medium, and user equipment | |
US20190159252A1 (en) | Uplink Transmission Method Based on Licensed-Assisted Access LAA System, and Apparatus | |
US20220046681A1 (en) | Method and device for reporting uplink control information, storage medium, and user equipment | |
WO2020029924A1 (en) | Transmission resource sharing | |
KR20200112680A (en) | Method and apparatus for transmitting and receiving signal in communication system supporting unlicensed band | |
KR20210018050A (en) | Method for reducing power consumption of terminal in unlicensed band communication, and apparatus therefor |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: FINAL REJECTION MAILED |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: RESPONSE AFTER FINAL ACTION FORWARDED TO EXAMINER |
|
STPP | Information on status: patent application and granting procedure in general |
Free format text: NON FINAL ACTION MAILED |