WO2020194731A1 - 無線基地局及びユーザ装置 - Google Patents
無線基地局及びユーザ装置 Download PDFInfo
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- WO2020194731A1 WO2020194731A1 PCT/JP2019/013837 JP2019013837W WO2020194731A1 WO 2020194731 A1 WO2020194731 A1 WO 2020194731A1 JP 2019013837 W JP2019013837 W JP 2019013837W WO 2020194731 A1 WO2020194731 A1 WO 2020194731A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/24—Negotiation of communication capabilities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/27—Control channels or signalling for resource management between access points
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
- H04W76/16—Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/02—Data link layer protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/12—Setup of transport tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
Definitions
- the present invention relates to a radio base station and a user device that execute dual connectivity.
- LTE Long Term Evolution
- LTE-Advanced LTE-Advanced
- 5G New Radio (NR) or Next Generation (NG) LTE successor systems
- RObust Header Compression compresses the header (IP / UDP / RTP header) by using the fact that the header in the same packet stream changes (or does not change) in a specific pattern. ) Is adopted.
- the memory area that can be used for header compression / decompression processing according to ROHC differs depending on the implementation of the user device (User Equipment, UE) and network (wireless base station, etc.).
- the UE notifies the network of the maximum number of header compression sessions (which may be called ROHC sessions) that can be set at the same time as the UE's capability. Specifically, the UE notifies the network of maxNumberROHC-ContextSessions (see Non-Patent Document 1).
- the UE and the network set a maximum value called maxCID so that the number of memory areas used for the header compression / decompression process does not exceed the capacity of the UE and the capacity of the network (see Non-Patent Document 2).
- the UE has dual connectivity that connects to multiple nodes (radio base stations) with different wireless access technologies (RAT), specifically, master node (MN) and secondary node (SN) at the same time.
- RAT wireless access technologies
- MN master node
- SN secondary node
- MR-DC Multi-Radio Dual Connectivity
- MN and SN radio base station independently determine the setting contents required for communication with the UE without recognizing the setting state of the other node. Therefore, if MN and SN set their own header compression sessions based on maxCID, specifically, ROHC sessions, the UE as a whole is required to set the number of ROHC sessions that exceeds maxNumberROHC-ContextSessions. there is a possibility.
- the present invention has been made in view of such a situation, and a radio base station and a user who can more reliably set a header compression session even when a predetermined dual connectivity (MR-DC) is executed.
- the purpose is to provide the device.
- One aspect of the present invention is the radio base station (eNB100A), wherein the user device executes dual connectivity based on the maximum number of header compression sessions (maxNumberROHC-ContextSessions) that can be set by the user device (UE200).
- the control unit (control unit 130) that determines the allocation number (maxCID) of the header compression session that can be set by the radio base station and the other radio base station (gNB100B), and the allocation information indicating the allocation number are the other radio bases. It is provided with a transmission unit (transmission unit 110) for transmitting to a station.
- One aspect of the present invention is a user device (UE200), which is a radio base station (UE200) in which the user device executes dual connectivity based on the maximum number of header compression sessions (maxNumberROHC-ContextSessions) that can be set by the user device.
- the control unit (control unit 230) that determines the allocation number (maxCID) of the header compression session that can be set with the eNB100A) and other radio base stations (gNB100B), and at least the radio base station and the allocation information indicating the allocation number It is provided with a transmission unit (transmission unit 210) that transmits to any of the other radio base stations.
- UE200 user device
- UE200 is a receiver that receives a header compression session setting request from either a radio base station or another radio base station on which the user device executes dual connectivity (UE200). It includes a receiving unit 220) and a control unit (control unit 230) that accepts the setting request even when a header compression session that exceeds the maximum number of header compression sessions that can be set by the user device is set.
- FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10.
- FIG. 2 is a functional block configuration diagram of the eNB 100A.
- FIG. 3 is a functional block configuration diagram of the UE 200.
- FIG. 4A is a diagram showing an example of determining the number of allocations (maxCID) of the conventional ROHC session.
- FIG. 4B is a diagram showing a determination example of the number of allocated ROHC sessions (maxCID) according to the present embodiment.
- FIG. 5 is a diagram showing an operation flow (No. 1) for determining the number of ROHC session allocations by the eNB 100A.
- FIG. 6 is a diagram showing an operation flow (No. 2) for determining the number of ROHC session allocations by the eNB 100A.
- FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10.
- FIG. 2 is a functional block configuration diagram of the eNB 100A.
- FIG. 3 is a functional block configuration diagram of the UE 200.
- FIG. 4A is
- FIG. 7 is a diagram showing an operation flow for determining the number of ROHC session allocations by the UE 200.
- FIG. 8 is a diagram showing an operation flow when the UE 200 receives a setting request for a ROHC session exceeding the capacity.
- FIG. 9 is a diagram showing an example of the hardware configuration of the eNB 100A, gNB 100B, and UE 200.
- FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the present embodiment.
- the wireless communication system 10 is a wireless communication system that complies with Long Term Evolution (LTE) and 5G New Radio (NR).
- LTE Long Term Evolution
- NR 5G New Radio
- LTE Long Term Evolution
- 4G Long Term Evolution
- 5G New Radio
- the wireless communication system 10 includes Evolved Universal Terrestrial Radio Access Network 20 (hereinafter, E-UTRAN20) and Next Generation-Radio Access Network 30 (hereinafter, NG RAN30). Further, the wireless communication system 10 includes a user device 200 (hereinafter, UE200).
- E-UTRAN20 Evolved Universal Terrestrial Radio Access Network 20
- NG RAN30 Next Generation-Radio Access Network 30
- UE200 user device 200
- E-UTRAN20 includes eNB100A, which is a wireless base station that complies with LTE.
- NG RAN30 includes gNB100B, which is a radio base station according to 5G (NR).
- the E-UTRAN20 and NGRAN30 may be eNB100A or gNB100B) may be simply referred to as a network.
- the eNB100A, gNB100B and UE200 support carrier aggregation (CA) that uses multiple component carriers (CC), and dual connectivity (DC) that simultaneously transmits component carriers between multiple NG-RAN Nodes and the UE. be able to.
- CA carrier aggregation
- CC component carriers
- DC dual connectivity
- the eNB 100A constitutes the master node (MN) and the gNB100B constitutes the secondary node (SN).
- Multi-Radio Dual Connectivity (MR-DC) specifically, E-UTRA-NR Dual Connectivity ( EN-DC) is executed.
- the eNB 100A constitutes a radio base station
- the gNB 100B constitutes another radio base station.
- UE200 executes communication using bearer B11 and bearer B12 set via eNB100A, and bearer B21 set via gNB100B.
- the bearers B11, B12 and B21 may be Data Radio Bearer (DRB) or Signaling Radio Bearer (SRB).
- DRB Data Radio Bearer
- SRB Signaling Radio Bearer
- the UE 200 supports Internet Protocol (IP), User Datagram Protocol (UDP) and Real-Time Transport Protocol (RTP), with an IP / UDP / RTP header added. Send and receive packets.
- IP Internet Protocol
- UDP User Datagram Protocol
- RTP Real-Time Transport Protocol
- the eNB100A, gNB100B and UE200 are equipped with a packet data convergence protocol layer (PDCP), and execute processing according to RObust Header Compression (ROHC) that compresses and decompresses the IP / UDP / RTP header part.
- PDCP packet data convergence protocol layer
- ROHC RObust Header Compression
- the eNB100A (or gNB100B) does not have to implement some functions related to determining the number of ROHC session allocations described below.
- the UE200 does not have to implement some functions related to determining the number of ROHC session allocations described below.
- the function for determining the number of ROHC session allocations may be implemented in either eNB100A (or gNB100B) or UE200. However, it does not prevent mounting on both eNB100A (gNB100B) and UE200.
- FIG. 2 is a functional block configuration diagram of the eNB 100A.
- the eNB 100A includes a transmission unit 110, a reception unit 120, and a control unit 130.
- the gNB100B also has almost the same configuration as the eNB100A except that the communication method is different.
- the transmission unit 110 transmits a downlink signal (DL signal) according to LTE. Further, the transmission unit 110 transmits a message to the gNB 100B according to a predetermined message format or via the inter-node interface.
- DL signal downlink signal
- the transmitter 110 can perform communication with the gNB100B via the X2 / Xn interface and send / receive messages between nodes to / from the gNB100B.
- the transmission unit 110 transmits to the gNB 100B a header compression session that can be set by the eNB 100A or the gNB 100B, specifically, allocation information indicating the number of allocations of the ROHC session.
- the receiving unit 120 receives the UL signal according to LTE.
- the receiving unit 120 can receive the allocated number of ROHC sessions determined by the UE 200.
- the receiving unit 120 receives the inter-node message transmitted from the gNB 100B via the X2 / Xn interface.
- the transmitter 110 and receiver 120 serve as a protocol stack for the UE 200, such as a physical layer (PHY), a medium access control layer (MAC), a wireless link control layer (RLC), and a packet data convergence protocol layer (PDCP). It also has a radio resource control layer (RRC).
- PHY physical layer
- MAC medium access control layer
- RLC wireless link control layer
- PDCP packet data convergence protocol layer
- RRC radio resource control layer
- the transmitting unit 110 and the receiving unit 120 execute the compression / decompression processing of the IP / UDP / RTP header according to ROHC in the PDCP layer.
- the ROHC session described above is set between PDCP entities (between eNB100A and UE200) where the compression / decompression process is executed.
- the PDCP entity shares the configured ROHC session context (including the IP / UDP / RTP header change pattern contained in the IP flow).
- the control unit 130 executes control regarding the UL signal transmitted by the transmission unit 110 and the DL signal received by the reception unit 120.
- control unit 130 executes control regarding the number of ROHC session allocations. Specifically, the control unit 130 determines the number of ROHC session allocations that can be set by the eNB 100A or gNB 100B, respectively.
- the eNB100A determines the number of ROHC sessions allocated to the eNB100A or gNB100B based on the maximum number of ROHC sessions that can be set by the UE200.
- maxNumberROHC-ContextSessions specified in 3GPP TS 38.306 can be used.
- maxNumberROHC-ContextSessions is defined as follows.
- maxNumberROHC-ContextSessions is notified from UE200 to the network as a kind of capability of UE200.
- maxCID specified in 3GPP TS 38.331 can be used.
- maxCID is specified as follows.
- maxCID indicates the maximum value of the identification number that identifies the ROHC session (context session).
- maxCID is set to a value so that the memory area (corresponding to the number of ROHC sessions) used for header compression / decompression processing according to ROHC does not exceed the capacity of eNB100A, gNB100B and UE200.
- control unit 130 can determine the number of ROHC session allocations that can be set by the eNB 100A and gNB 100B on which the UE 200 executes dual connectivity (MR-DC) based on the maxNumberROHC-ContextSessions corresponding to the UE 200.
- MR-DC dual connectivity
- the number of ROHC session allocations (maxCID) is notified from the network to the UE200.
- the UE200 determines and determines the number of ROHC session allocations to be assigned to the eNB 100A and gNB 100B, respectively, as described later.
- the number of allocations can also be notified to the network (eNB100A and gNB100B).
- control unit 130 can determine the number of allocations assigned to the eNB 100A and the number of allocations assigned to the gNB 100B based on maxNumberROHC-ContextSessions. For example, when maxNumberROHC-ContextSessions is "4", the control unit 130 can determine the number of allocations assigned to the eNB 100A and the number of allocations assigned to the gNB 100B to be "2", respectively. The number of allocations may be "2" or less.
- maxCID indicates the maximum value of the identification number for identifying the ROHC session to be set, and the identification number starts from "0".
- the maxCID assigned to the eNB100A and the maxCID assigned to the gNB100B are "1", respectively.
- control unit 130 may determine the number of ROHC sessions allocated to the gNB100B based on the maxNumberROHC-ContextSessions and the number of ROHC sessions set by the eNB100A as UE200.
- control unit 130 may determine the number of ROHC sessions allocated to gNB100B to be "3". The number of allocations may be "3" or less.
- control unit 130 can set the ROHC session based on the number of allocations transmitted from the UE 200.
- FIG. 3 is a functional block configuration diagram of the UE 200. As shown in FIG. 3, the UE 200 includes a transmission unit 210, a reception unit 220, and a control unit 230.
- the transmission unit 210 transmits an uplink signal (UL signal) according to LTE or NR.
- the transmission unit 210 transmits allocation information indicating the number of allocations of ROHC sessions to the network.
- the transmission unit 210 can transmit allocation information indicating the number of allocations (maxCID) of ROHC sessions to at least one of eNB100A and gNB100B.
- the allocation information may be notified to the network as the capability of UE200.
- the receiving unit 220 receives the downlink signal (DL signal) according to LTE or NR.
- the receiving unit 220 receives the allocation number from the network.
- the transmitting unit 210 and the receiving unit 220 are a physical layer (PHY), a medium access control layer (MAC), a wireless link control layer (RLC), and a packet data convergence protocol layer (PDCP) as a protocol stack for a network. And so on. Although not shown in FIG. 3, the transmitting unit 210 and the receiving unit 220 also have a radio resource control layer (RRC) as the protocol stack.
- PHY physical layer
- MAC medium access control layer
- RLC wireless link control layer
- PDCP packet data convergence protocol layer
- RRC radio resource control layer
- the transmitting unit 210 and the receiving unit 220 process short packets such as voice packets, so that the transmission unit 210 and the reception unit 220 use the Internet Protocol (IP), the User Datagram Protocol (UDP), and the Real-time Transport Protocol. Supports (RTP).
- IP Internet Protocol
- UDP User Datagram Protocol
- RTP Real-time Transport Protocol. Supports
- the control unit 230 executes control regarding the UL signal transmitted by the transmission unit 210 and the DL signal received by the reception unit 220.
- control unit 230 executes control regarding the number of ROHC session allocations. Specifically, the control unit 230 can set the eNB100A and gNB100B for which the UE200 executes dual connectivity (MR-DC) based on the maximum number of ROHC sessions (maxNumberROHC-ContextSessions) that can be set by the UE200. Determine the number of allocations.
- MR-DC dual connectivity
- maximum number of ROHC sessions maximum number of ROHC sessions
- control unit 230 can determine the number of ROHC session allocations (maxCID) that can be set for each of the eNB 100A and gNB 100B, similarly to the control unit 130 of the eNB 100A described above.
- control unit 230 may determine the number of allocations in response to a request from the network. That is, the control unit 230 does not have to determine the number of allocations when there is no request from the network.
- FIG. 4A shows an example of determining the number of conventional ROHC session allocations (maxCID).
- FIG. 4B shows an example of determining the number of allocated ROHC sessions (maxCID) according to the present embodiment. Specifically, FIG. 4B shows an example of determining the number of ROHC session allocations (maxCID) during MR-DC (EN-DC) execution with eNB100A (MN) and gNB100B (SN).
- the UE 200 and the network use only the memory area below the identification number indicated by maxCID (for example, “memory area # 3” in the UE 200), that is, four memory areas.
- maxCID for example, “memory area # 3” in the UE 200
- ROI session Use only the following.
- UE200 executes dual connectivity with eNB100A (MN) and gNB100B (SN)
- MN eNB100A
- SN gNB100B
- maxNumber ROHC-ContextSessions of UE200 (Here, "4") must be set so as not to exceed.
- ROHC sessions that can be set in MN and SN are allocated so as not to exceed the maxNumberROHC-ContextSessions.
- maxNumberROHC-ContextSessions is the maximum number of ROHC sessions in UE units. Therefore, if multiple DRBs for which ROHC is available are set, it is necessary to set the maxCID of each DRB so that maxNumberROHC-ContextSessions is not exceeded.
- the maxCID of each bearer should be set so as not to exceed maxNumberROHC-ContextSessions. It is stipulated that it needs to be set.
- a voice packet is a typical type of packet to which ROHC is applied.
- the voice packet has the following configuration.
- IPv4 / IPv6 20/40 Byte -UDP header: 8 Byte ⁇ RTP header: 12 Byte -Payload: 32 Byte
- IPv4 / IPv6 20/40 Byte -UDP header: 8 Byte ⁇
- RTP header 12 Byte -Payload: 32 Byte
- the IP / UDP / RTP header can be compressed to a minimum of 3 bytes.
- FIG. 5 shows an operation flow (No. 1) for determining the number of ROHC session allocations by the eNB 100A.
- the eNB100A determines the number of ROHC sessions that can be used by each node (MN and SN) including its own node (S10).
- the eNB100A determines the number of ROHC session allocations (maxCID) that can be set by MN and SN, respectively, based on the maxNumberROHC-ContextSessions of UE200. More specifically, the eNB 100A distributes the maximum number of ROHC sessions (for example, "4") based on maxNumberROHC-ContextSessions to MN and SN (each "2").
- the eNB100A notifies the other node (gNB100B) of the determined number of allocations (S20). Specifically, the eNB 100A can explicitly or implicitly notify the gNB 100B of the determined allocation number by the following method.
- eNB100A notifies gNB100B of the number of allocations assigned to the decision-making body node.
- the decision-making body node (eNB100A) notifies gNB100B of the number of allocations assigned to the other node (gNB100B).
- the number of allocations for each bearer may be notified, or when a plurality of bearers are set, the sum of the number of allocations (maxCID) set in the decision-making node (eNB100A) may be notified.
- the other node may consider the number of ROHC sessions that can be set by the other node as a predetermined predetermined value when the allocation number is not notified. For example, a minimum value (0), a default value (15), or a value obtained by dividing maxNumberROHC-ContextSessions by a predetermined value (number of nodes, etc.) can be used.
- FIG. 6 shows an operation flow (No. 2) for determining the number of ROHC session allocations by the eNB 100A.
- the eNB100A sets up a ROHC session with UE200 (S110). Specifically, the eNB100A configures one or more ROHC sessions as UE200 based on a ROHC session configuration request from the UE200 or network.
- the eNB100A notifies the other node (gNB100B) of the value corresponding to the number of ROHC sessions set as UE200 (S120). Specifically, the eNB 100A determines the number of allocations assigned to the gNB 100B based on the maxNumber ROHC-ContextSessions of the UE 200 and the set number of ROHC sessions set by the eNB 100A as the UE 200.
- the number of ROHC sessions allocated to the gNB100B can be the same notification method as in operation example 1.
- any node may request the desired number of allocations from the other node (SN). Upon receiving the request, the node (MN) may respond that the desired quota is acceptable, and if not, notify the other node of the acceptable quota.
- the other node may consider that the desired number of allocations has been accepted by the MN.
- the eNB 100A and the gNB 100B can exchange the above-mentioned information by either communication via the X2 / Xn interface or transmission / reception of messages between nodes.
- eNB100A is the main body, but gNB100B may be the main body.
- gNB100B may be MN (that is, NE-DC) or SN.
- the eNB 100A and the gNB 100B may exchange the capability information indicating that the above-mentioned allocation number determination process can be performed in advance.
- the UE 200 determines the number of ROHC sessions allocated to the eNB 100A and gNB 100B based on the maxNumberROHC-ContextSessions of the UE200 (operation example 1). Further, the UE 200 accepts the allocated number of ROHC sessions exceeding the maxNumberROHC-ContextSessions of the UE 200 even when the network notifies the allocated number (operation example 2).
- FIG. 7 shows an operation flow for determining the number of ROHC session allocations by the UE 200.
- the UE 200 determines the number of ROHC sessions that each node, specifically the eNB 100A (MN) and gNB 100B (SN), can use (S210).
- MN eNB 100A
- SN gNB 100B
- the method for determining the number of ROHC sessions is the same as the operation example 1 for determining the number of ROHC sessions allocated by the eNB 100A described above.
- the UE200 distributes the value of maxNumberROHC-ContextSessions of the UE200 between each wireless access technology (RAT), in other words, into each cell group.
- RAT wireless access technology
- the distribution method may be simply divided into two, or may be proportional to the number of DRBs supported by each RAT.
- UE200 notifies eNB100A (MN) and gNB100B (SN) of the determined number of allocations (S220).
- MN eNB100A
- SN gNB100B
- the UE200 may notify the determined number of allocations as the ability of the UE200 in each RAT. Note that the UE 200 may notify only one of the nodes of the allocated number, and the node that receives the allocated number may notify the value corresponding to the other node.
- the UE 200 may determine the number of allocations in response to a request from the network. That is, the UE 200 may execute the above-mentioned determination operation only when the network requests the determination of the allocation number.
- FIG. 8 shows an operation flow when the UE 200 receives a setting request for a ROHC session exceeding the capacity.
- the UE200 receives a ROHC session setting request with the eNB100A (MN) or gNB100B (SN) (S310).
- MN eNB100A
- SN gNB100B
- the UE200 determines whether or not the capacity of the UE200 is exceeded when the ROHC session is set based on the setting request (S320).
- UE200 determines whether maxCID exceeds maxNumberROHC-ContextSessions.
- UE200 allows the setting request even if maxCID exceeds maxNumberROHC-ContextSessions (S330).
- UE200 notifies the network that the capacity of UE200 has been exceeded by accepting the setting request (S340).
- the UE200 may notify that the capacity of the UE200 has been exceeded, or may notify that the number of ROHC sessions has exceeded. Further, the UE 200 may notify the information of the target bearer (for example, DRB-ID).
- the target bearer for example, DRB-ID
- the UE200 may discard the PDU (packet).
- the UE 200 notifies the network in advance of the capacity information (for example, 1-bit information) indicating that it can respond to the above-mentioned operation of determining the number of allocations and the operation when the ROHC session setting request exceeding the capacity is received. May be good.
- the capacity information for example, 1-bit information
- the eNB 100A determines the number of ROHC sessions allocated to the eNB 100A or gNB 100B based on the maximum number of ROHC sessions that can be set by the UE 200, and transmits the allocation information indicating the number of allocations to the gNB 100B.
- the UE200 determines the number of ROHC session allocations assigned to the eNB100A or gNB100B based on the maximum number of ROHC sessions that the UE200 can configure, and assigns the allocation information indicating the number of allocations to at least one of the eNB100A and gNB100B. Send.
- the eNB 100A and gNB 100B were determined not to exceed the maximum number of ROHC sessions (maxNumberROHC-ContextSessions) that the UE 200 can set, even when the UE 200 performs dual connectivity, specifically MR-DC. ROHC sessions can be set up based on the number of allocations.
- the eNB 100A can determine the number of allocations assigned to the eNB 100A and the number of allocations assigned to the gNB 100B based on the maxNumberROHC-ContextSessions of UE200. Therefore, the number of ROHC sessions assigned to each node can be efficiently determined while avoiding exceeding the capacity of UE200.
- the eNB 100A can determine the number of ROHC sessions allocated to the gNB 100B based on the maxNumber ROHC-ContextSessions of the UE 200 and the number of ROHC sessions set by the eNB 100A as the UE 200. Therefore, even if a certain number of ROHC sessions have already been set, the number of ROHC sessions assigned to each node can be efficiently determined while avoiding exceeding the capacity of UE200.
- the UE 200 can determine the number of ROHC session allocations in response to a request from the network. Therefore, even when multiple types of UEs with different supported releases are mixed, the network can instruct the UE200, which supports the operation of determining the allocation number of ROHC sessions, to perform the operation, and also supports the operation. Backward compatibility with older releases of UEs that haven't been released can also be ensured.
- the eNB100A determines the number of ROHC session allocations, but instead of the MN, the gNB100B (SN) may determine the number of ROHC session allocations.
- maxCID was used as the number of ROHC sessions allocated, but maxCID does not necessarily have to be used.
- maxCID indicates the maximum value of the identification number that identifies the ROHC session to be set, but a new parameter that directly indicates the number of ROHC session allocations may be used.
- the voice packet is mentioned as an application to which ROHC is applied, but even if a short packet in which the ratio of the header to the payload is large, for example, a packet for Industrial IoT (IIoT) is targeted. Good.
- IIoT Industrial IoT
- each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by using two or more physically or logically separated devices). , Wired, wireless, etc.) and may be realized using these plurality of devices.
- the functional block may be realized by combining the software with the one device or the plurality of devices.
- Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption.
- broadcasting notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but only these.
- a functional block that makes transmission function is called a transmitting unit or a transmitter.
- the method of realizing each is not particularly limited.
- FIG. 9 is a diagram showing an example of the hardware configuration of the device.
- the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.
- the word “device” can be read as a circuit, device, unit, etc.
- the hardware configuration of the device may be configured to include one or more of each of the devices shown in the figure, or may be configured not to include some of the devices.
- Each functional block of the device (see FIGS. 2 and 3) is realized by any hardware element of the computer device or a combination of the hardware elements.
- the processor 1001 performs the calculation, controls the communication by the communication device 1004, and the memory. It is realized by controlling at least one of reading and writing of data in 1002 and storage 1003.
- Processor 1001 operates, for example, an operating system to control the entire computer.
- the processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.
- CPU central processing unit
- the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- a program program code
- a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used.
- the various processes described above may be executed by one processor 1001 or may be executed simultaneously or sequentially by two or more processors 1001.
- Processor 1001 may be implemented by one or more chips.
- the program may be transmitted from the network via a telecommunication line.
- the memory 1002 is a computer-readable recording medium, and is composed of at least one such as ReadOnlyMemory (ROM), ErasableProgrammableROM (EPROM), Electrically ErasableProgrammableROM (EEPROM), and RandomAccessMemory (RAM). May be done.
- the memory 1002 may be called a register, a cache, a main memory (main storage device), or the like.
- the memory 1002 can store a program (program code), a software module, or the like that can execute the method according to the embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like.
- Storage 1003 may be referred to as auxiliary storage.
- the recording medium described above may be, for example, a database, server or other suitable medium containing at least one of memory 1002 and storage 1003.
- the communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.
- Communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of.
- FDD frequency division duplex
- TDD time division duplex
- the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside.
- the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information.
- the bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.
- the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA).
- the hardware may implement some or all of each functional block.
- processor 1001 may be implemented using at least one of these hardware.
- information notification includes physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI), upper layer signaling (eg, RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block)). (MIB), System Information Block (SIB)), other signals or combinations thereof.
- DCI Downlink Control Information
- UCI Uplink Control Information
- RRC signaling may also be referred to as an RRC message, for example, RRC Connection Setup. ) Message, RRC Connection Reconfiguration message, etc. may be used.
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- SUPER 3G IMT-Advanced
- 4th generation mobile communication system 4th generation mobile communication system
- 5G 5 th generation mobile communication system
- Future Radio Access FAA
- New Radio NR
- W-CDMA registered trademark
- GSM registered trademark
- CDMA2000 Code Division Multiple Access 2000
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi (registered trademark))
- IEEE 802.16 WiMAX®
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth®
- other systems that utilize suitable systems and at least next-generation systems extended based on them. It may be applied to one.
- a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).
- the specific operation performed by the base station in the present disclosure may be performed by its upper node (upper node).
- various operations performed for communication with a terminal are performed by the base station and other network nodes other than the base station (for example, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.).
- S-GW network node
- the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).
- Information and signals can be output from the upper layer (or lower layer) to the lower layer (or upper layer).
- Input / output may be performed via a plurality of network nodes.
- the input / output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information can be overwritten, updated, or added. The output information may be deleted. The input information may be transmitted to another device.
- the determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).
- the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit notification, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.
- Software is an instruction, instruction set, code, code segment, program code, program, subprogram, software module, whether called software, firmware, middleware, microcode, hardware description language, or another name.
- Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted to mean.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- a transmission medium For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
- wired technology coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.
- wireless technology infrared, microwave, etc.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.
- a channel and a symbol may be a signal (signaling).
- the signal may be a message.
- the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.
- system and “network” used in this disclosure are used interchangeably.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented.
- the radio resource may be one indicated by an index.
- Base Station BS
- Wireless Base Station Wireless Base Station
- NodeB NodeB
- eNodeB eNodeB
- gNodeB gNodeB
- Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
- the base station can accommodate one or more (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio)). Communication services can also be provided by Head: RRH).
- a base station subsystem eg, a small indoor base station (Remote Radio)
- Communication services can also be provided by Head: RRH).
- cell refers to a base station that provides communication services in this coverage, and part or all of the coverage area of at least one of the base station subsystems.
- MS mobile station
- UE user equipment
- Mobile stations can be subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless, depending on the trader. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like.
- the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be.
- at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation.
- at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter).
- communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- Each aspect / embodiment of the present disclosure may be applied to the configuration.
- the mobile station may have the function of the base station.
- words such as "up” and “down” may be read as words corresponding to communication between terminals (for example, "side”).
- the uplink, downlink, and the like may be read as side channels.
- the mobile station in the present disclosure may be read as a base station.
- the base station may have the functions of the mobile station.
- connection means any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two “connected” or “combined” elements.
- the connections or connections between the elements may be physical, logical, or a combination thereof.
- connection may be read as "access”.
- the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain.
- Electromagnetic energy with wavelengths in the microwave and light (both visible and invisible) regions, etc. can be considered to be “connected” or “coupled” to each other.
- the reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot (Pilot) depending on the applicable standard.
- RS Reference Signal
- Pilot pilot
- references to elements using designations such as “first”, “second” as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.
- the term "A and B are different” may mean “A and B are different from each other”.
- the term may mean that "A and B are different from C”.
- Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
- Wireless communication system 20 E-UTRAN 30 NG RAN 100A eNB 100B gNB 110 Transmitter 120 Receiver 130 Control 200 UE 210 Transmitter 220 Receiver 230 Control B11, B12, B21 Bearer 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus
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Abstract
Description
図1は、本実施形態に係る無線通信システム10の全体概略構成図である。無線通信システム10は、Long Term Evolution(LTE)及び5G New Radio(NR)に従った無線通信システムである。なお、LTEは4Gと呼ばれてもよいし、NRは、5Gと呼ばれてもよい。
次に、無線通信システム10の機能ブロック構成について説明する。具体的には、eNB100A及びUE200の機能ブロック構成について説明する。
図2は、eNB100Aの機能ブロック構成図である。図2に示すように、eNB100Aは、送信部110、受信部120及び制御部130を備える。なお、gNB100Bも、通信方式が異なる点を除き、eNB100Aと概ね同様の構成を有する。
maxNumberROHC-ContextSessionsは、UE200の能力(capability)の一種として、UE200からネットワークに通知される。
The total value of MAX_CIDs across all bearers for the UE should be less than or equal to the value of maxNumberROHC-ContextSessions parameter as indicated by the UE. The network configures the same value for maxCID in both rohc and uplinkOnlyROHC.
つまり、maxCIDは、ROHCセッション(コンテキストセッション)を識別する識別番号の最大値を示す。maxCIDは、ROHCに従ったヘッダ圧縮・解凍処理に用いるメモリ領域(ROHCセッションの数と対応する)がeNB100A、gNB100B及びUE200の能力を超過しないような値に設定される。
図3は、UE200の機能ブロック構成図である。図3に示すように、UE200は、送信部210、受信部220及び制御部230を備える。
次に、無線通信システム10の動作について説明する。具体的には、UE200及びネットワーク(eNB100A, gNB100B)によるROHCセッションの割り当て数(maxCID)の決定例、eNB100Aによる当該割り当て数の決定動作、及びUE200による当該割り当て数の決定動作について説明する。
図4Aは、従来のROHCセッションの割り当て数(maxCID)の決定例を示す。図4Bは、本実施形態に係るROHCセッションの割り当て数(maxCID)の決定例を示す。具体的には、図4Bは、eNB100A(MN)及びgNB100B(SN)とのMR-DC(EN-DC)実行時におけるROHCセッションの割り当て数(maxCID)の決定例を示す。
・UDPヘッダ: 8 Byte
・RTPヘッダ: 12 Byte
・ペイロード: 32 Byte
ROHCを適用することによって、IP/UDP/RTPヘッダを最小3byteまで圧縮することができる。
次に、eNB100AがROHCセッションの割り当て数を決定する場合における動作フローについて説明する。eNB100Aは、ROHCセッションの割り当て数の決定に関して、gNB100Bとのコーディネーションを実行する。
図5は、eNB100AによるROHCセッションの割り当て数の決定動作フロー(その1)を示す。
・決定主体ノード(eNB100A)が、他方のノード(gNB100B)に割り当てられた割り当て数をgNB100Bに通知する
なお、ベアラ単位の割り当て数が通知されてもよいし、ベアラが複数設定される場合には、決定主体ノード(eNB100A)に設定されている割り当て数(maxCID)の和が通知されてもよい。
図6は、eNB100AによるROHCセッションの割り当て数の決定動作フロー(その2)を示す。
次に、UE200がROHCセッションの割り当て数を決定する場合における動作フローについて説明する。UE200は、UE200のmaxNumberROHC-ContextSessionsに基づいて、eNB100A及びgNB100BへのROHCセッションの割り当て数を決定する(動作例1)。また、UE200は、UE200のmaxNumberROHC-ContextSessionsを超過するROHCセッションの割り当て数がネットワークから通知された場合でも、当該割り当て数を受け入れる(動作例2)。
図7は、UE200によるROHCセッションの割り当て数の決定動作フローを示す。図7に示すように、UE200は、各ノード、具体的には、eNB100A(MN)及びgNB100B(SN)が用いることができるROHCセッション数を決定する(S210)。
図8は、UE200が能力以上のROHCセッションの設定要求を受信した場合における動作フローを示す。
上述した実施形態によれば、以下の作用効果が得られる。具体的には、eNB100Aは、UE200が設定できるROHCセッションの最大数に基づいて、eNB100AまたはgNB100Bに割り当てられるROHCセッションの割り当て数を決定し、当該割り当て数を示す割り当て情報をgNB100Bに送信する。
以上、実施例に沿って本発明の内容を説明したが、本発明はこれらの記載に限定されるものではなく、種々の変形及び改良が可能であることは、当業者には自明である。
20 E-UTRAN
30 NG RAN
100A eNB
100B gNB
110 送信部
120 受信部
130 制御部
200 UE
210 送信部
220 受信部
230 制御部
B11, B12, B21 ベアラ
1001 プロセッサ
1002 メモリ
1003 ストレージ
1004 通信装置
1005 入力装置
1006 出力装置
1007 バス
Claims (5)
- 無線基地局であって、
ユーザ装置が設定できるヘッダ圧縮セッションの最大数に基づいて、前記ユーザ装置がデュアルコネクティビティを実行する前記無線基地局及び他の無線基地局がそれぞれ設定できるヘッダ圧縮セッションの割り当て数を決定する制御部と、
前記割り当て数を示す割り当て情報を前記他の無線基地局に送信する送信部と
を備える無線基地局。 - 前記制御部は、前記最大数に基づいて、前記無線基地局に割り当てられる前記割り当て数、及び前記他の無線基地局に割り当てられる前記割り当て数を決定する請求項1に記載の無線基地局。
- 前記制御部は、前記最大数と、前記無線基地局が前記ユーザ装置と設定しているヘッダ圧縮セッションの設定数とに基づいて、前記他の無線基地局に割り当てられる前記割り当て数を決定する請求項1に記載の無線基地局。
- ユーザ装置であって、
前記ユーザ装置が設定できるヘッダ圧縮セッションの最大数に基づいて、前記ユーザ装置がデュアルコネクティビティを実行する無線基地局及び他の無線基地局とそれぞれ設定できるヘッダ圧縮セッションの割り当て数を決定する制御部と、
前記割り当て数を示す割り当て情報を少なくとも前記無線基地局及び前記他の無線基地局の何れかに送信する送信部と
を備えるユーザ装置。 - 前記制御部は、ネットワークからの要求に応じて前記割り当て数を決定する請求項4に記載のユーザ装置。
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PCT/JP2019/013837 WO2020194731A1 (ja) | 2019-03-28 | 2019-03-28 | 無線基地局及びユーザ装置 |
EP19921038.6A EP3952432B1 (en) | 2019-03-28 | 2019-03-28 | Radio base station, radio communication system and method |
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US17/598,678 US20220159509A1 (en) | 2019-03-28 | 2019-03-28 | Radio base station and user equipment |
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JP2016532373A (ja) * | 2013-08-08 | 2016-10-13 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | 複数のアクセスノード間でユーザ機器処理能力を割り振るための技術 |
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CN104519585B (zh) * | 2013-09-27 | 2018-08-31 | 上海诺基亚贝尔股份有限公司 | 调度用户设备的方法和装置 |
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EP3598793A4 (en) * | 2017-03-14 | 2020-09-23 | NTT DoCoMo, Inc. | WIRELESS COMMUNICATION DEVICE AND WIRELESS COMMUNICATION METHOD |
US20180343697A1 (en) * | 2017-05-26 | 2018-11-29 | Mediatek Inc. | UE Category and Capability Indication for Co-existed LTE and NR Devices |
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CN109429217B (zh) * | 2017-06-23 | 2021-11-19 | 中国移动通信有限公司研究院 | 一种信息交互方法、第一基站、第二基站和移动通信终端 |
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-
2019
- 2019-03-28 WO PCT/JP2019/013837 patent/WO2020194731A1/ja unknown
- 2019-03-28 JP JP2021508653A patent/JP7382394B2/ja active Active
- 2019-03-28 US US17/598,678 patent/US20220159509A1/en not_active Abandoned
- 2019-03-28 CN CN201980094379.8A patent/CN113615242A/zh active Pending
- 2019-03-28 KR KR1020217031880A patent/KR102743755B1/ko active Active
- 2019-03-28 EP EP19921038.6A patent/EP3952432B1/en active Active
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JP2016532373A (ja) * | 2013-08-08 | 2016-10-13 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | 複数のアクセスノード間でユーザ機器処理能力を割り振るための技術 |
Non-Patent Citations (6)
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"Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Multi-connectivity; Stage 2 (Release 15", 3GPP TS 37.340, December 2018 (2018-12-01) |
"Technical Specification Group Radio Access Network; NR; Radio Resource Control (RRC) protocol specification (Release 15", 3GPP TS 38.331, December 2018 (2018-12-01) |
"Technical Specification Group Radio Access Network; NR; User Equipment (UE) radio access capabilities (Release 15", 3GPP TS 38.306, December 2018 (2018-12-01) |
3GPP TS 38.331 |
CATT: "UE capability coordination", 3GPP TSG-RAN WG2# 85 R2-140176, 10 February 2014 (2014-02-10), XP050737406 * |
NSN; NOKIA CORPORATION: "MeNB-initiated procedures for dual connectivity", 3GPP TSG-RAN WG2#86 R2-142307, 19 May 2014 (2014-05-19), XP050790215 * |
Also Published As
Publication number | Publication date |
---|---|
JP7382394B2 (ja) | 2023-11-16 |
US20220159509A1 (en) | 2022-05-19 |
EP3952432A1 (en) | 2022-02-09 |
KR102743755B1 (ko) | 2024-12-18 |
EP3952432B1 (en) | 2024-11-06 |
CN113615242A (zh) | 2021-11-05 |
EP3952432A4 (en) | 2022-11-02 |
JPWO2020194731A1 (ja) | 2020-10-01 |
KR20210142127A (ko) | 2021-11-24 |
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