WO2022154543A1 - 논리 채널의 사용 가능한 harq 프로세스를 설정하는 방법 및 장치 - Google Patents
논리 채널의 사용 가능한 harq 프로세스를 설정하는 방법 및 장치 Download PDFInfo
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- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
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Definitions
- the present disclosure relates to the operation of a terminal and a base station in a mobile communication system. More specifically, the present disclosure relates to operations of a terminal and a base station related to a hybrid automatic repeat request (HARQ) process in a mobile communication system.
- HARQ hybrid automatic repeat request
- 5G mobile communication technology defines a wide frequency band to enable fast transmission speed and new services, and includes not only the frequency bands below 6 GHz ('Sub 6 GHz') such as 3.5 GHz (3.5 GHz), but also millimeter waves (28 GHz and 39 GHz). It can be implemented in the very high frequency band ('Above 6GHz') called mmWave).
- 6G mobile communication technology which is called a system after 5G communication (Beyond 5G), in order to achieve transmission speed 50 times faster than 5G mobile communication technology and ultra-low latency reduced by 1/10. Implementations in the Terahertz band (such as, for example, the 95 GHz to 3 THz band) are being considered.
- NR-U New Radio Unlicensed
- NTN Non Terrestrial Network
- the Intelligent Factory Intelligent Internet of Things, IIoT
- IAB Intelligent Internet of Things
- Mobility Enhancement including Conditional Handover and Dual Active Protocol Stack (DAPS) handover
- 2-step RACH 2-step RACH for simplifying random access procedures
- Standardization of the air interface architecture/protocol field for technologies such as NR is also in progress
- 5G baseline architecture e.g., Service based Architecture, Service based Interface
- MEC Mobile Edge Computing
- AI artificial intelligence
- ML machine learning
- this 5G mobile communication system is a new waveform (Waveform), Full Dimensional MIMO (FD-MIMO), and Array Antenna for guaranteeing coverage in the terahertz band of 6G mobile communication technology.
- multi-antenna transmission technology such as large scale antenna, metamaterial-based lens and antenna to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using OAM (Orbital Angular Momentum), RIS ( Not only Reconfigurable Intelligent Surface technology, but also full duplex technology, satellite, and AI (Artificial Intelligence) for frequency efficiency improvement and system network improvement of 6G mobile communication technology are utilized from the design stage and end-to-end -to-end)
- AI-based communication technology that realizes system optimization by internalizing AI support functions, and next-generation distributed computing technology that realizes services with complexity that exceed the limits of terminal computing power by utilizing ultra-high-performance communication and computing resources could be the basis for
- a method of a terminal in a communication system includes logical channel configuration information including first information on an available hybrid automatic repeat request (HARQ) mode corresponding to a logical channel and second information on available HARQ modes for each HARQ process ID.
- logical channel configuration information including first information on an available hybrid automatic repeat request (HARQ) mode corresponding to a logical channel and second information on available HARQ modes for each HARQ process ID.
- HARQ hybrid automatic repeat request
- a method of a base station in a communication system is provided.
- logical channel configuration information including first information on available HARQ modes corresponding to logical channels and serving cell configuration information including second information on available HARQ modes for each HARQ process ID terminal sending to; and receiving uplink data from the terminal, wherein the first information and the second information are used for a logical channel prioritization procedure, and the uplink data is based on a result of the logical channel prioritization procedure.
- a terminal of a communication system includes a transceiver; and serving cell configuration information connected to the transceiver and including logical channel configuration information including first information on available HARQ modes corresponding to logical channels and second information on available HARQ modes for each HARQ process ID a control unit for receiving from the base station, performing a logical channel prioritization procedure based on the first information and the second information, and transmitting uplink data to the base station based on the result of the logical channel prioritization procedure It is characterized in that it includes.
- a base station of a communication system includes a transceiver; and serving cell configuration information connected to the transceiver and including logical channel configuration information including first information on available HARQ modes corresponding to logical channels and second information on available HARQ modes for each HARQ process ID a control unit for transmitting to the terminal and receiving uplink data from the terminal, wherein the first information and the second information are used in a logical channel prioritization procedure, and the uplink data is used in the logical channel prioritization procedure. It is characterized in that it is based on the results.
- a method of setting an usable HARQ process of a logical channel and an apparatus capable of performing the same are provided.
- the terminal may be configured with an available (allowed) HARQ process for each logical channel, and data may be transmitted through the available HARQ process for each logical channel.
- the data may be retransmitted as much as a delay time requirement is satisfied.
- FIG. 1 is a diagram illustrating a structure of an NTN according to an embodiment of the present disclosure.
- FIG. 2 is a diagram illustrating an example in which a retransmission delay time occurs during uplink retransmission in NTN according to an embodiment of the present disclosure.
- LCP logical channel prioritization
- FIG. 4 is a diagram illustrating a method of applying an LCP restriction according to an embodiment of the present disclosure.
- FIG. 5 is a diagram illustrating a method of applying an LCP restriction according to an embodiment of the present disclosure.
- FIG. 6 is a diagram illustrating a method of applying an LCP restriction according to an embodiment of the present disclosure.
- FIG. 7 is a diagram illustrating a method of applying an LCP restriction according to an embodiment of the present disclosure.
- FIG. 8 is a diagram illustrating a method of applying an LCP restriction according to an embodiment of the present disclosure.
- FIG. 9 is a diagram illustrating an example of instructing uplink retransmission based on UE capability in NTN according to an embodiment of the present disclosure.
- FIG. 10 is a diagram illustrating a structure of a terminal according to an embodiment of the present disclosure.
- FIG. 11 is a diagram illustrating a structure of a base station according to an embodiment of the present disclosure.
- the base station is a subject performing resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network.
- the terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function.
- a downlink (DL) is a wireless transmission path of a signal transmitted from a base station to a terminal
- an uplink (UL) is a wireless transmission path of a signal transmitted from a terminal to a flag station.
- LTE or LTE-A system may be described below as an example, the embodiment of the present disclosure may be applied to other communication systems having a similar technical background or channel type.
- 5G mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in this, and the following 5G may be a concept including existing LTE, LTE-A and other similar services.
- 5G new radio
- the present disclosure may be applied to other communication systems through some modifications within a range that does not significantly depart from the scope of the present disclosure as judged by a person having skilled technical knowledge.
- each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions.
- These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions.
- These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory.
- the instructions stored in the flowchart block(s) may produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s).
- the computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).
- each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in the blocks to occur out of order. For example, two blocks shown one after another may in fact be performed substantially simultaneously, or it is possible that the blocks are sometimes performed in the reverse order according to the corresponding function.
- ' ⁇ unit' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and ' ⁇ unit' refers to what roles carry out
- '-part' is not limited to software or hardware.
- ' ⁇ unit' may be configured to reside on an addressable storage medium or may be configured to refresh one or more processors.
- ' ⁇ ' denotes components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables.
- components and ' ⁇ units' may be combined into a smaller number of components and ' ⁇ units' or further separated into additional components and ' ⁇ units'.
- components and ' ⁇ units' may be implemented to play one or more CPUs in a device or secure multimedia card.
- ' ⁇ unit' may include one or more processors.
- the method and apparatus proposed in the embodiments of the present disclosure are not limited to each embodiment, and may be applied using all or a combination of one or more embodiments proposed in the present disclosure or some embodiments.
- the embodiments of the present disclosure may be applied through some modifications within a range that does not significantly depart from the scope of the present disclosure as judged by a person having skilled technical knowledge.
- NTN non-terrestrial network
- the terminal 110 may communicate with the satellite base station 120 .
- a network that provides a communication service through an artificial satellite that is not located on the ground in this way may be referred to as a non-terrestrial network (NTN).
- NTN non-terrestrial network
- the satellite 120 independently acts as a base station or may serve to relay the signal of a 5G network gateway 130 that acts as a base station on the ground, and the actual role of the satellite may vary depending on the structure of the NTN.
- the 5G network gateway 130 may be connected to the core network 140 to transmit data from the core network and the external network to the terminal, or may transfer data from the terminal to the core network and the external network.
- the satellite 120 used in the NTN must be equipped with a 5G communication modem to enable wireless communication with the terminal, and in this case, it may be called a satellite base station. Since these artificial satellites are thousands of kilometers (km) to tens of thousands of kilometers away from the ground, radio waves transmitted between the terminal 110 and the satellite 120 have a longer propagation delay than a terrestrial network (TN). can have If it is necessary to exchange messages between the terminal 110 and the satellite base station 120 , the propagation delay time from the terminal 110 to the satellite base station 120 and the propagation delay from the satellite base station 120 to the terminal 110 .
- TN terrestrial network
- a round trip time (RTT) is required as much as the sum of the times, and in NTN, a large RTT may cause degradation of service quality. Therefore, in order to provide a service having a short delay time requirement in NTN, it is necessary to devise a method for transmitting data corresponding to the service by minimizing the propagation delay time or the round trip delay time.
- FIG. 2 is a diagram illustrating an example in which a retransmission delay time occurs during uplink retransmission in NTN according to an embodiment of the present disclosure.
- an uplink refers to a radio link that the terminal 210 transmits to the base station.
- a radio link from the terminal 210 to the satellite base station 220 or a radio link from the terminal 210 to the satellite base station 220 and connected to the satellite base station 220 to a 5G network gateway serving as a base station. can be called uplink.
- the satellite base station 220 may allocate resources (uplink grants) that can be transmitted in uplink to the terminal 210 ( 230 ).
- the base station 220 may transmit uplink resource allocation information to the terminal 210 through a downlink control information (DCI) format of a physical downlink control channel (PDCCH).
- DCI downlink control information
- the terminal 210 that has decoded the received DCI can know the location and detailed information of the radio resource where the actual uplink transmission will occur.
- the time when the terminal 210 receives the uplink resource allocation information 230 is a time when the base station 220 transmits the uplink resource allocation information to the terminal 210 by a propagation delay time 235 .
- the terminal 210 may transmit uplink data to the satellite base station 220 ( 240 ).
- the time point at which the satellite base station 220 receives the uplink data is a time point that has passed by the propagation delay time 245 from the time point at which the terminal 210 transmits the uplink data.
- the base station 220 may allocate an uplink resource for retransmission ( 250 ).
- the base station 220 may also transmit the allocation information of uplink resources for retransmission to the terminal 210 through the DCI format of the PDCCH, and the terminal 210 that has decoded the received DCI content may cause actual uplink transmission to occur.
- the terminal 210 may transmit uplink data corresponding to the retransmission to the satellite base station 220 ( 260 ).
- the time point at which the satellite base station 220 receives the uplink data becomes a time point that has passed by the propagation delay time 265 from the time point at which the terminal 210 transmits the uplink data. As shown in FIG.
- the retransmission delay time 270 including the propagation delay time is also long due to the long propagation delay times 235 , 245 , 255 , 265 .
- the retransmission delay time may also be referred to as a retransmission round trip time (RTT).
- RTT retransmission round trip time
- the retransmission delay time becomes long due to the long propagation delay time, and according to the long retransmission delay time, it is difficult to provide data having a short delay time requirement, which may result in performance degradation. Meanwhile, it may be unnecessary from the viewpoint of delay time requirements for the base station to allocate uplink radio resources for retransmission and the terminal to perform retransmission.
- the base station may set to the terminal whether to perform uplink retransmission for each HARQ process.
- the configuration message for whether to perform such uplink retransmission may be transmitted in a MAC CE (medium access control-control element) format or DCI (downlink control information) format.
- MAC CE medium access control-control element
- DCI downlink control information
- uplink transmission between a satellite base station and a terminal is exemplified, but this is only for convenience of description, and the present disclosure is not limited thereto.
- the propagation delay time changes to the sum of the propagation delay time between the satellite base station and the terminal and the propagation delay time between the satellite base station and the 5G network gateway, but the phenomenon that the retransmission delay time increases is the same. can be clearly explained.
- LCP logical channel prioritization
- a radio bearer is a control signal for transmitting control information such as a radio resource control (RRC) message or a non-access stratum (NAS) message.
- RRC radio resource control
- NAS non-access stratum
- SRB radio resource control
- SRB data radio bearer that transmits user data.
- the radio bearer may have an entity of a service data adaptation protocol (SDAP), a packet data convergence protocol (PDCP), and a radio link control (RLC) layer.
- SDAP service data adaptation protocol
- PDCP packet data convergence protocol
- RLC radio link control
- Each RLC device of the radio bearer may correspond to a MAC device, and the MAC device transmits data in one or more cells.
- One cell may have several hybrid automatic repeat request (HARQ) processes, and the MAC device may transmit and receive packets for each HARQ process.
- HARQ hybrid automatic repeat request
- cell 1 and cell 2 each have 8 HARQ processes, and each HARQ process has a HARQ process ID (HPI) from 0 to 7.
- HPI HARQ process ID
- this is merely an assumption for convenience of description, and the present disclosure is not limited thereto. That is, the number of HARQ processes that each cell has may vary according to a communication system or a terminal.
- different configuration information may be configured for each radio bearer according to requirements such as delay and reliability of information transmitted by the radio bearer.
- performing multiple retransmissions may increase the delay time of information transmitted by the radio bearer. If the information transmitted by the radio bearer requires a short delay time, a plurality of retransmissions may correspond to information that is no longer needed at the time of reception because it already exceeds the delay time requirement. On the other hand, if information transmitted by a certain radio bearer is valid regardless of the long delay time, it is possible to increase the accuracy by performing a plurality of retransmissions.
- data transmission may be performed by adjusting the number of retransmissions according to a delay time requirement.
- the terminal cannot know the number of uplink transmissions set by the base station. Therefore, the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission according to the number of retransmissions.
- the base station determines the number of retransmissions for each HARQ process to be used, and the terminal can set the available (allowed) HARQ process for each logical channel from the base station, data is transmitted through the HARQ process that can be used for each logical channel. and, for the transmitted data, as much retransmission that satisfies the delay time requirement may be performed.
- a list of available (allowed) HARQ processes may be included in a logical channel configuration in an RRC message transmitted by the base station to the terminal.
- the terminal prioritizes the logical channel (logical channel prioritization) action can be performed. After performing the logical channel prioritization operation, the terminal may perform uplink transmission by including data on the logical channel for which the size of the transmittable resource is secured in the uplink radio resource.
- each cell has a HARQ process ID from 0 to (the number of HARQ processes in the cell) - 1, and this ID value can be unique only in that cell. Therefore, when configuring a HARQ process usable in a MAC device, the ID of the available HARQ process may be commonly applied to the HARQ process of a cell connected to all MAC devices (or within a cell group). Through this, in the case of carrier aggregation in which a plurality of cells are configured, it is possible to set an available HARQ process commonly applied to all cells in the MAC device, thereby preventing an increase in configuration overhead.
- all HARQ processes configured for the logical channel may be used.
- a list of HARQ process IDs that can be used in all cells connected to the MAC device (or within a cell group) may be included.
- 1 and 2 may be included in the list of available HARQ processes.
- FIG. 4 is a diagram illustrating a method of applying an LCP restriction according to an embodiment of the present disclosure.
- a radio bearer includes a control signal radio bearer (SRB) that transmits control information such as an RRC message or a NAS message and a data radio bearer that transmits user data.
- SRB control signal radio bearer
- the radio bearer may have SDAP, PDCP, and RLC layer devices.
- the SRB may not have an SDAP device.
- Each RLC device of the radio bearer may correspond to a MAC device, and the MAC device transmits data in one or more cells.
- One cell may have several HARQ processes, and the MAC device may transmit/receive packets for each HARQ process. Referring to FIG. 4 , in the embodiment of FIG.
- cell 1 and cell 2 each have eight HARQ processes, and each HARQ process has a HARQ process ID (HPI) from 0 to 7.
- HPI HARQ process ID
- this is merely an assumption for convenience of description, and the present disclosure is not limited thereto. That is, the number of HARQ processes that each cell has may vary according to a communication system or a terminal.
- different configuration information may be configured for each radio bearer according to requirements such as delay time and accuracy of information transmitted by the radio bearer.
- performing multiple retransmissions may increase the delay time of information transmitted by the radio bearer. If the information transmitted by the radio bearer requires a short delay time, a plurality of retransmissions may correspond to information that is no longer needed at the time of reception because it already exceeds the delay time requirement. On the other hand, if information transmitted by a certain radio bearer is valid regardless of the long delay time, it is possible to increase the accuracy by performing a plurality of retransmissions.
- data transmission may be performed by adjusting the number of retransmissions according to a delay time requirement.
- the terminal cannot know the number of uplink transmissions set by the base station. Therefore, the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission according to the number of retransmissions.
- the base station determines the number of retransmissions for each HARQ process to be used, and if the terminal can set an available (allowed) HARQ process for each logical channel from the base station, data is transmitted through the HARQ process that can be used for each logical channel. and, for the transmitted data, as much retransmission that satisfies the delay time requirement may be performed.
- a list of available (allowed) HARQ processes for each cell may be included in the logical channel configuration in the RRC message transmitted by the base station to the terminal.
- the terminal may perform a logical channel priority operation.
- the terminal may perform uplink transmission by including data on the logical channel for which the size of the transmittable resource is secured in the uplink radio resource.
- Each cell has a HARQ process ID from 0 to (number of HARQ processes in the cell) - 1, and this ID value can be unique only in that cell. Therefore, when setting an available HARQ process in a specific cell, the ID of the available HARQ process can be applied only to the corresponding cell. Through this, in the case of carrier aggregation in which a plurality of cells are configured, it is possible to obtain an advantage in that cells can be independently operated by setting an HARQ process that can be used for different cells. In the logical channel of the embodiment of FIG.
- a cell ID may be used for configuration to identify which cell is an available HARQ process.
- a list of HARQ process IDs usable in each cell may be included instead of such a bitmap.
- the cell ID may be used for configuration in order to identify which HARQ process is available for which cell.
- FIG. 5 is a diagram illustrating a method of applying an LCP restriction according to an embodiment of the present disclosure.
- a radio bearer includes a control signal radio bearer (SRB) that transmits control information such as an RRC message or a NAS message and a data radio bearer that transmits user data.
- SRB control signal radio bearer
- the radio bearer may have SDAP, PDCP, and RLC layer devices.
- the SRB may not have an SDAP device.
- Each RLC device of the radio bearer may correspond to a MAC device, and the MAC device transmits data in one or more cells.
- One cell may have several HARQ processes, and the MAC device may transmit/receive packets for each HARQ process. Referring to FIG. 5 , in the embodiment of FIG.
- cell 1 and cell 2 each have eight HARQ processes, and each HARQ process has a HARQ process ID (HPI) from 0 to 7.
- HPI HARQ process ID
- different configuration information may be configured for each radio bearer according to requirements such as delay time and accuracy of information transmitted by the radio bearer. As described above in FIG. 2 , in a communication system with a long propagation delay time, such as NTN, since the retransmission delay time is long, performing multiple retransmissions may increase the delay time of information transmitted by the radio bearer.
- a plurality of retransmissions may correspond to information that is no longer needed at the time of reception because it already exceeds the delay time requirement.
- information transmitted by a certain radio bearer is valid regardless of the long delay time, it is possible to increase the accuracy by performing a plurality of retransmissions.
- data transmission may be performed by adjusting the number of retransmissions according to a delay time requirement.
- the terminal cannot know the number of uplink transmissions set by the base station.
- the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission according to the number of retransmissions.
- the base station determines the number of retransmissions for each HARQ process to be used, and if the terminal can set an available (allowed) HARQ process for each logical channel from the base station, data is transmitted through the HARQ process that can be used for each logical channel. and, for the transmitted data, as much retransmission that satisfies the delay time requirement may be performed.
- a method of setting a usable HARQ process for each logical channel applied by the MAC device is shown.
- a list of available (allowed) HARQ processes may be included in the RRC message transmitted by the base station to the terminal for logical channel setup.
- the terminal in order to allow data to be transmitted only through the uplink radio resource of the HARQ process ID included in the list of available HARQ processes for the corresponding logical channel, the terminal may perform a logical channel priority operation. After performing the logical channel prioritization operation, the terminal may perform uplink transmission by including data on the logical channel for which the size of the transmittable resource is secured in the uplink radio resource.
- each cell has a HARQ process ID from 0 to (the number of HARQ processes in the cell) - 1, and this ID value can be unique only in that cell. Therefore, when configuring a HARQ process usable in a MAC device, the ID of the available HARQ process may be commonly applied to the HARQ process of a cell connected to all MAC devices (or within a cell group). Through this, in the case of carrier aggregation in which a plurality of cells are configured, it is possible to set an available HARQ process that is commonly applied to all cells in the MAC device, thereby preventing an increase in configuration overhead. Meanwhile, in the embodiment of FIG.
- the available HARQ processes may be indicated based on the lowest offset (min available HPI) of the available HARQ process IDs and the number of available HARQ processes. For example, for the logical channel of the embodiment of FIG. 5, the lowest offset (min available HPI) of the available HARQ process ID is set to 0, and the number of available HARQ processes is set to 6, so that the HPI It may indicate that a HARQ process greater than or equal to the lowest offset and less than or equal to (the lowest offset of the available HARQ process ID) + (the number of available HARQ processes) - 1 is an available HARQ process. That is, in the embodiment of FIG.
- all HARQ processes configured for the corresponding logical channel may be used. Also, if the lowest value offset of the available HARQ process ID is omitted, the lowest value offset may be assumed to be a value of 0.
- FIG. 6 is a diagram illustrating a method of applying an LCP restriction according to an embodiment of the present disclosure.
- a radio bearer includes a control signal radio bearer (SRB) that transmits control information such as an RRC message or a NAS message and a data radio bearer that transmits user data.
- SRB control signal radio bearer
- the radio bearer may have SDAP, PDCP, and RLC layer devices.
- the SRB may not have an SDAP device.
- Each RLC device of the radio bearer may correspond to a MAC device, and the MAC device transmits data in one or more cells.
- One cell may have several HARQ processes, and the MAC device may transmit/receive packets for each HARQ process. Referring to FIG. 6 , in the embodiment of FIG.
- cell 1 and cell 2 each have eight HARQ processes, and each HARQ process has a HARQ process ID (HPI) from 0 to 7.
- HPI HARQ process ID
- different configuration information may be configured for each radio bearer according to requirements such as delay time and accuracy of information transmitted by the radio bearer.
- performing multiple retransmissions may increase the delay time of information transmitted by the radio bearer. If the information transmitted by the radio bearer requires a short delay time, a plurality of retransmissions may correspond to information that is no longer needed at the time of reception because it already exceeds the delay time requirement. On the other hand, if information transmitted by a certain radio bearer is valid regardless of the long delay time, it is possible to increase the accuracy by performing a plurality of retransmissions.
- data transmission may be performed by adjusting the number of retransmissions according to a delay time requirement.
- the terminal cannot know the number of uplink transmissions set by the base station. Therefore, the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission according to the number of retransmissions.
- the base station determines the number of retransmissions for each HARQ process to be used, and if the terminal can set an available (allowed) HARQ process for each logical channel from the base station, data is transmitted through the HARQ process that can be used for each logical channel. and, for the transmitted data, as much retransmission that satisfies the delay time requirement may be performed.
- a list of available (allowed) HARQ processes for each cell may be included in the logical channel configuration in the RRC message transmitted by the base station to the terminal.
- the terminal may perform a logical channel priority operation.
- the terminal may perform uplink transmission by including data on the logical channel for which the size of the transmittable resource is secured in the uplink radio resource.
- each cell has a HARQ process ID from 0 to (number of HARQ processes in the cell) - 1, and this ID value can be unique only in that cell. Therefore, when a HARQ process usable in a specific cell is set, the ID of the usable HARQ process can be applied only in the corresponding cell. Through this, in the case of carrier aggregation in which a plurality of cells are configured, it is possible to obtain an advantage in that cells can be independently operated by setting an HARQ process that can be used for different cells. Meanwhile, in the embodiment of FIG.
- the available HARQ processes may be indicated based on the lowest offset (min available HPI) of the available HARQ process IDs for each cell and the number of available HARQ processes. For example, for the logical channel of the embodiment of FIG. 6 , the lowest offset (min available HPI) of the HARQ process ID available in cell 1 is set to 0, and the number of available HARQ processes is set to 6, so that the HARQ available for HPI is set to 6. It may indicate that a HARQ process greater than or equal to the lowest offset of the process ID and less than or equal to (the lowest offset of the available HARQ process ID) + (the number of available HARQ processes) - 1 is an available HARQ process.
- FIG. 7 is a diagram illustrating a method of applying an LCP restriction according to an embodiment of the present disclosure.
- a radio bearer includes a control signal radio bearer (SRB) that transmits control information such as an RRC message or a NAS message and a data radio bearer that transmits user data.
- SRB control signal radio bearer
- the radio bearer may have SDAP, PDCP, and RLC layer devices.
- the SRB may not have an SDAP device.
- Each RLC device of the radio bearer may correspond to a MAC device, and the MAC device transmits data in one or more cells.
- One cell may have several HARQ processes, and the MAC device may transmit/receive packets for each HARQ process. Referring to FIG. 7 , in the embodiment of FIG.
- cell 1 and cell 2 each have 8 HARQ processes, and each HARQ process has HARQ process IDs (HPIs) from 0 to 7.
- HPIs HARQ process IDs
- this is merely an assumption for convenience of description, and the present disclosure is not limited thereto. That is, the number of HARQ processes that each cell has may vary according to a communication system or a terminal.
- different configuration information may be configured for each radio bearer according to requirements such as delay time and accuracy of information transmitted by the radio bearer.
- performing multiple retransmissions may increase the delay time of information transmitted by the radio bearer. If the information transmitted by the radio bearer requires a short delay time, a plurality of retransmissions may correspond to information that is no longer needed at the time of reception because it already exceeds the delay time requirement. On the other hand, if information transmitted by a certain radio bearer is valid regardless of the long delay time, it is possible to increase the accuracy by performing a plurality of retransmissions.
- data transmission may be performed by adjusting the number of retransmissions according to a delay time requirement.
- the terminal cannot know the number of uplink transmissions set by the base station. Therefore, the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission according to the number of retransmissions.
- the base station determines the number of retransmissions for each HARQ process to be used, and if the terminal can receive the available (allowed) HARQ process for each logical channel from the base station, data is transmitted through the HARQ process that can be used for each logical channel. and, for the transmitted data, as much retransmission that satisfies the delay time requirement may be performed.
- FIG. 7 shows a method of designating a usable HARQ process ID through the HARQ process type.
- HARQ process types there may be three types of HARQ process types: Type 1 (T1), Type 2 (T2), and Type 3 (T3).
- This may be configured through a cell-specific configuration (eg, ServingCellConfig) or a cell group configuration common to the MAC layer (eg, CellGroupConfig).
- the HARQ process type may be configured for each HARQ process ID of the cell, which is a cell-specific configuration (eg, ServingCellConfig_) or a cell group configuration common to the MAC layer (eg, , CellGroupConfig).
- the HARQ process type allowed for logical channel configuration of the RRC message transmitted by the base station to the terminal may be included.
- the terminal in order to allow data to be transmitted only through the uplink radio resource (uplink grant) of the HARQ process ID corresponding to the available HARQ process type for the corresponding logical channel, the terminal may perform a logical channel priority operation. have. After performing the logical channel prioritization operation, the terminal may perform uplink transmission by including data on the logical channel for which the size of the transmittable resource is secured in the uplink radio resource.
- Each cell shown in the embodiment of FIG. 7 has a HARQ process ID from 0 to (the number of HARQ processes in the cell) - 1, and this ID value can be unique only in that cell. Therefore, when configuring a HARQ process usable in a MAC device, the ID of the available HARQ process may be commonly applied to the HARQ process of a cell connected to all MAC devices (or within a cell group). Through this, in the case of carrier aggregation in which a plurality of cells are configured, it is possible to set an available HARQ process that is commonly applied to all cells in the MAC device, thereby preventing an increase in configuration overhead. Meanwhile, in the embodiment of FIG.
- FIG. 8 is a diagram illustrating a method of applying an LCP restriction according to an embodiment of the present disclosure.
- a radio bearer includes a control signal radio bearer (SRB) that transmits control information such as an RRC message or a NAS message and a data radio bearer that transmits user data.
- SRB control signal radio bearer
- the radio bearer may have SDAP, PDCP, and RLC layer devices.
- the SRB may not have an SDAP device.
- Each RLC device of the radio bearer may correspond to a MAC device, and the MAC device transmits data in one or more cells.
- One cell may have several HARQ processes, and the MAC device may transmit/receive packets for each HARQ process. Referring to FIG. 8 , in the embodiment of FIG.
- cell 1 and cell 2 each have eight HARQ processes, and each HARQ process has a HARQ process ID (HPI) from 0 to 7.
- HPI HARQ process ID
- different configuration information may be configured for each radio bearer according to requirements such as delay time and accuracy of information transmitted by the radio bearer.
- performing multiple retransmissions may increase the delay time of information transmitted by the radio bearer. If the information transmitted by the radio bearer requires a short delay time, a plurality of retransmissions may correspond to information that is no longer needed at the time of reception because it already exceeds the delay time requirement. On the other hand, if information transmitted by a certain radio bearer is valid regardless of the long delay time, it is possible to increase the accuracy by performing a plurality of retransmissions.
- data transmission may be performed by adjusting the number of retransmissions according to a delay time requirement.
- the terminal cannot know the number of uplink transmissions set by the base station. Therefore, the terminal cannot adjust the number of retransmissions or determine whether to perform data transmission according to the number of retransmissions.
- the base station determines the number of retransmissions for each HARQ process to be used, and if the terminal can set an available (allowed) HARQ process for each logical channel from the base station, data is transmitted through the HARQ process that can be used for each logical channel. and, for the transmitted data, as much retransmission that satisfies the delay time requirement may be performed.
- the embodiment of FIG. 8 shows a method of designating an HARQ process of a separate group.
- the HARQ process of a separate group may be referred to as a special HARQ process.
- Which HARQ process is a special HARQ process may be configured in the UE for each cell or for each cell group. If the HARQ process ID of the special HARQ process in common among cells in the cell group is the same, the base station may inform the UE of the special HARQ process by setting the ID of the special HARQ process in the cell group configuration.
- each cell may inform the UE of the special HARQ process by setting the special HARQ process ID in cell configuration.
- FIG. 8 it is assumed that each cell has a HARQ process ID of a special HARQ process.
- a setting value indicating whether a special HARQ process can be used for a logical channel may be included in the logical channel setting in the RRC message that the base station makes to the terminal.
- the terminal prioritizes the logical channel action can be performed. After performing the logical channel prioritization operation, the terminal may perform uplink transmission by including data on the logical channel for which the size of the transmittable resource is secured in the uplink radio resource.
- a HARQ process other than a special HARQ process may be used for the corresponding logical channel.
- FIG. 9 is a diagram illustrating an example of instructing uplink retransmission based on UE capability in NTN according to an embodiment of the present disclosure.
- the time required for data transmission is increased due to the long propagation delay time 970 . This can be several times the RTT time depending on the number of retransmissions. In this case, continuous data transmission may not be performed for a limited number of HARQ processes set in the terminal 910 .
- the terminal 910 having an infinite number of HARQ processes is also limited by practical limitations such as memory problems. Therefore, the terminal 910 may report the number of HARQ processes that can be used in each cell to the base station 920 through the terminal capability message (922).
- the terminal capability message may include the number of HARQ processes commonly supported by the terminal 910 in each cell or the number of HARQ processes supported by the terminal for each cell.
- the terminal capability message since the terminal capability message also follows the general NTN data transmission, it may arrive at the base station 920 after experiencing a propagation delay time 925 .
- the base station 920 may allocate uplink resources to the terminal 910 ( 930 ), and perform uplink transmission 940 and retransmission 960 based on information in the message. .
- FIG. 10 is a diagram illustrating a structure of a terminal according to an embodiment of the present disclosure.
- the terminal may include a transceiver 1010 , a controller 1020 , and a memory 1030 .
- the controller may be defined as a circuit or an application-specific integrated circuit or at least one processor.
- the transceiver 1010 may transmit/receive signals to and from other network entities.
- the transceiver 1010 may receive, for example, system information from a base station, and may receive a synchronization signal or a reference signal.
- the controller 1020 may control the overall operation of the terminal according to the embodiment proposed in the present disclosure. For example, the controller 1020 may control a signal flow between blocks to perform an operation according to the above-described flowchart.
- the memory 1030 may store at least one of information transmitted/received through the transceiver 1010 and information generated through the control unit 1020 .
- FIG. 11 is a diagram illustrating a structure of a base station according to an embodiment of the present disclosure.
- the base station may include a transceiver 1110 , a controller 1120 , and a memory 1130 .
- the controller 1120 may be defined as a circuit or an application specific integrated circuit or at least one processor.
- the transceiver 1110 may transmit/receive a signal to/from another network entity.
- the transceiver 1110 may transmit, for example, system information to the terminal, and may transmit a synchronization signal or a reference signal.
- the controller 1120 may control the overall operation of the base station according to the embodiment proposed in the present disclosure. For example, the controller 1120 may control a signal flow between blocks to perform an operation according to the above-described flowchart.
- the memory 1130 may store at least one of information transmitted and received through the transceiver 1110 and information generated through the control unit 1120 .
- FIGS. 1 to 11 of the present disclosure may include methods in which at least one or more drawings are combined according to various implementations.
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Abstract
Description
Claims (15)
- 통신 시스템에서 단말의 방법에 있어서,기지국으로부터, 논리 채널에 대응되는 사용 가능한 HARQ(hybrid automatic repeat request) 모드에 대한 제1 정보를 포함하는 논리 채널 설정 정보 및 HARQ 프로세스 ID 별 사용 가능한 HARQ 모드에 대한 제2 정보를 포함하는 서빙 셀 설정 정보를 수신하는 단계;상기 제1 정보 및 상기 제2 정보에 기반하여, 논리 채널 우선화(prioritization) 절차를 수행하는 단계; 및상기 논리 채널 우선화 절차의 결과에 기반하여, 상향링크 데이터를 상기 기지국에 전송하는 단계를 포함하는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 논리 채널 우선화 절차를 수행하는 단계는,상기 제1 정보 및 상기 제2 정보에 기반하여, 상향링크 그랜트와 연관된 HARQ 프로세스 ID의 사용 가능한 HARQ 모드와 대응되는 논리 채널을 확인하는 단계; 및상기 확인된 논리 채널에 상기 상향링크 그랜트에 대한 자원을 할당하는 단계를 포함하는 것을 특징으로 하는 방법.
- 제2항에 있어서,상기 상향링크 그랜트는 상기 기지국으로부터 수신한 DCI(downlink control information)에 기반하여 확인되는 것을 특징으로 하는 방법.
- 제1항에 있어서,상기 사용 가능한 HARQ 모드는 제1 모드 및 제2 모드 중 하나인 것을 특징으로 하는 방법.
- 통신 시스템에서 기지국의 방법에 있어서,논리 채널에 대응되는 사용 가능한 HARQ(hybrid automatic repeat request) 모드에 대한 제1 정보를 포함하는 논리 채널 설정 정보 및 HARQ 프로세스 ID 별 사용 가능한 HARQ 모드에 대한 제2 정보를 포함하는 서빙 셀 설정 정보를 단말에 전송하는 단계; 및상기 단말로부터, 상향링크 데이터를 수신하는 단계를 포함하며,상기 제1 정보 및 상기 제2 정보는 논리 채널 우선화 절차에 사용되고,상기 상향링크 데이터는 상기 논리 채널 우선화 절차의 결과에 기반하는 것을 특징으로 하는 방법.
- 제5항에 있어서,상기 제1 정보 및 상기 제2 정보는 상기 논리 채널 우선화 절차에서 상향링크 그랜트와 연관된 HARQ 프로세스 ID의 사용 가능한 HARQ 모드와 대응되는 논리 채널을 확인하는데 사용되며,상기 확인된 논리 채널에 상기 상향링크 그랜트에 대한 자원이 할당되는 것을 특징으로 하는 방법.
- 제6항에 있어서,상기 상향링크 그랜트는 상기 단말에 전송한 DCI(downlink control information)에 기반하여 확인되는 것을 특징으로 하는 방법.
- 제5항에 있어서,상기 사용 가능한 HARQ 모드는 제1 모드 및 제2 모드 중 하나인 것을 특징으로 하는 방법.
- 통신 시스템의 단말에 있어서,송수신부; 및상기 송수신부와 연결되고,기지국으로부터, 논리 채널에 대응되는 사용 가능한 HARQ(hybrid automatic repeat request) 모드에 대한 제1 정보를 포함하는 논리 채널 설정 정보 및 HARQ 프로세스 ID 별 사용 가능한 HARQ 모드에 대한 제2 정보를 포함하는 서빙 셀 설정 정보를 수신하고,상기 제1 정보 및 상기 제2 정보에 기반하여, 논리 채널 우선화(prioritization) 절차를 수행하며,상기 논리 채널 우선화 절차의 결과에 기반하여, 상향링크 데이터를 상기 기지국에 전송하는 제어부를 포함하는 것을 특징으로 하는 단말.
- 제9항에 있어서,상기 제어부는,상기 제1 정보 및 상기 제2 정보에 기반하여, 상향링크 그랜트와 연관된 HARQ 프로세스 ID의 사용 가능한 HARQ 모드와 대응되는 논리 채널을 확인하며,상기 확인된 논리 채널에 상기 상향링크 그랜트에 대한 자원을 할당하는 것을 특징으로 하는 단말.
- 제10항에 있어서,상기 상향링크 그랜트는 상기 기지국으로부터 수신한 DCI(downlink control information)에 기반하여 확인되는 것을 특징으로 하는 단말.
- 제9항에 있어서,상기 사용 가능한 HARQ 모드는 제1 모드 및 제2 모드 중 하나인 것을 특징으로 하는 단말.
- 통신 시스템의 기지국에 있어서,송수신부; 및상기 송수신부와 연결되고,논리 채널에 대응되는 사용 가능한 HARQ(hybrid automatic repeat request) 모드에 대한 제1 정보를 포함하는 논리 채널 설정 정보 및 HARQ 프로세스 ID 별 사용 가능한 HARQ 모드에 대한 제2 정보를 포함하는 서빙 셀 설정 정보를 단말에 전송하고,상기 단말로부터, 상향링크 데이터를 수신하는 제어부를 포함하며,상기 제1 정보 및 상기 제2 정보는 논리 채널 우선화 절차에 사용되고,상기 상향링크 데이터는 상기 논리 채널 우선화 절차의 결과에 기반하는 것을 특징으로 하는 기지국.
- 제13항에 있어서,상기 제1 정보 및 상기 제2 정보는 상기 논리 채널 우선화 절차에서 상향링크 그랜트와 연관된 HARQ 프로세스 ID의 사용 가능한 HARQ 모드와 대응되는 논리 채널을 확인하는데 사용되며,상기 확인된 논리 채널에 상기 상향링크 그랜트에 대한 자원이 할당되는 것을 특징으로 하는 기지국.
- 제14항에 있어서,상기 상향링크 그랜트는 상기 단말에 전송한 DCI(downlink control information)에 기반하여 확인되며,상기 사용 가능한 HARQ 모드는 제1 모드 및 제2 모드 중 하나인 것을 특징으로 하는 기지국.
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US18/261,420 US20240072944A1 (en) | 2021-01-14 | 2022-01-13 | Method and device for configuring available harq process of logical channel |
KR1020237024131A KR20230124013A (ko) | 2021-01-14 | 2022-01-13 | 논리 채널의 사용 가능한 harq 프로세스를 설정하는방법 및 장치 |
EP22739736.1A EP4262116A1 (en) | 2021-01-14 | 2022-01-13 | Method and device for configuring available harq process of logical channel |
CN202280010123.6A CN116803031A (zh) | 2021-01-14 | 2022-01-13 | 用于配置逻辑信道的可用harq进程的方法及装置 |
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US202163137607P | 2021-01-14 | 2021-01-14 | |
US63/137,607 | 2021-01-14 |
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US (1) | US20240072944A1 (ko) |
EP (1) | EP4262116A1 (ko) |
KR (1) | KR20230124013A (ko) |
CN (1) | CN116803031A (ko) |
WO (1) | WO2022154543A1 (ko) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020089858A1 (en) * | 2018-11-01 | 2020-05-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Lch mapping to harq process id for non-terrestrial networks |
KR20200103790A (ko) * | 2018-02-14 | 2020-09-02 | 구글 엘엘씨 | Nr을 위한 harq 버퍼 관리 방법 |
WO2020193609A1 (en) * | 2019-03-28 | 2020-10-01 | Telefonaktiebolaget Lm Ericsson (Publ) | Logical channel prioritization for pre-emption |
WO2020223453A2 (en) * | 2019-04-30 | 2020-11-05 | Idac Holdings, Inc. | Open loop harq in wireless systems |
-
2022
- 2022-01-13 US US18/261,420 patent/US20240072944A1/en active Pending
- 2022-01-13 EP EP22739736.1A patent/EP4262116A1/en active Pending
- 2022-01-13 CN CN202280010123.6A patent/CN116803031A/zh active Pending
- 2022-01-13 KR KR1020237024131A patent/KR20230124013A/ko unknown
- 2022-01-13 WO PCT/KR2022/000685 patent/WO2022154543A1/ko active Application Filing
Patent Citations (4)
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KR20200103790A (ko) * | 2018-02-14 | 2020-09-02 | 구글 엘엘씨 | Nr을 위한 harq 버퍼 관리 방법 |
WO2020089858A1 (en) * | 2018-11-01 | 2020-05-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Lch mapping to harq process id for non-terrestrial networks |
WO2020193609A1 (en) * | 2019-03-28 | 2020-10-01 | Telefonaktiebolaget Lm Ericsson (Publ) | Logical channel prioritization for pre-emption |
WO2020223453A2 (en) * | 2019-04-30 | 2020-11-05 | Idac Holdings, Inc. | Open loop harq in wireless systems |
Non-Patent Citations (1)
Title |
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ERICSSON: "Harmonizing UL CG enhancements in NR-U and URLLC", 3GPP DRAFT; R2-2008881, vol. RAN WG2, 22 October 2020 (2020-10-22), pages 1 - 6, XP051941960 * |
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CN116803031A (zh) | 2023-09-22 |
US20240072944A1 (en) | 2024-02-29 |
EP4262116A1 (en) | 2023-10-18 |
KR20230124013A (ko) | 2023-08-24 |
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