WO2019035434A1 - 無線基地局及び通信制御方法 - Google Patents
無線基地局及び通信制御方法 Download PDFInfo
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- WO2019035434A1 WO2019035434A1 PCT/JP2018/030169 JP2018030169W WO2019035434A1 WO 2019035434 A1 WO2019035434 A1 WO 2019035434A1 JP 2018030169 W JP2018030169 W JP 2018030169W WO 2019035434 A1 WO2019035434 A1 WO 2019035434A1
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- capability information
- capability
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- base station
- parameter
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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
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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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
- H04W8/24—Transfer of terminal data
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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
- H04W88/08—Access point devices
Definitions
- the present invention relates to a wireless base station that includes a central apparatus and a distributed apparatus and performs wireless communication with a user apparatus and a communication control method.
- LTE Long Term Evolution
- LTE-Advanced LTE-Advanced
- 5G New Radio (NR) 5G New Radio
- NR radio base station
- gNB radio base station
- CU central unit
- DU distributed unit
- HLS Higher Layer Split
- RRC Radio Resource Control Layer
- PDCP Packet Data Convergence Protocol Layer
- RLC Radio Link Control Layer
- Non-Patent Document 1 it has been proposed to manage parameters in units of user equipment (UE) in CU and manage parameters in units of cells in DU on the premise of HLS (see Non-Patent Document 1).
- the CU can hold UE capability information (UE Capability) and information from the core network (for example, UE type, QoS Class Identifier (QCI), etc.), so UE specific parameters are set. It is possible. In addition, it is expected that information on resources related to DU can be easily implemented in multi-vendor operation, since the degree of interdependence between CU and DU can be suppressed by avoiding management by CU as much as possible.
- UE Capability UE capability information
- QCI QoS Class Identifier
- UE Capability is notified from the UE to the gNB via the RRC layer. Also, according to the above-mentioned HLS, RRC will be provided in the CU.
- the DU needs to manage also the parameters affected by the UE Capability.
- DU can not recognize the content of UE Capability managed by CU, and there is a problem that it can not set the suitable parameter according to the content of UE Capability managed by CU side.
- the present invention has been made in view of such a situation, and the central unit (CU) manages capability information of the UE, which is a type of parameter for each user device (UE), and the capability information is used according to the capability information.
- An object of the present invention is to provide a radio base station and a communication control method capable of determining appropriate parameters in accordance with the contents of capability information even when the affected parameters are managed by the distributed device (DU).
- wireless base station 200 including a first device (central device 210) and a second device (distributed device 260) and performing wireless communication with a user device (user device 300).
- the first apparatus acquires capability information acquisition unit (capability information acquisition unit for acquiring capability information (UE Capability) indicating capability of the user apparatus from the user apparatus via a radio resource control layer (RRC)).
- capability information acquisition unit for acquiring capability information (UE Capability) indicating capability of the user apparatus from the user apparatus via a radio resource control layer (RRC)
- a capability information transfer unit for transferring the capability information acquired by the capability information acquisition unit to the second device, the second device controlling the wireless communication Parameter holding unit (parameter holding unit 263) for holding the parameters to be selected, a capability information receiving unit (ability information receiving unit 265) for receiving the capability information transferred by the first device, and the capability information receiving unit The said ability information Based on, and a parameter determining unit that determines the contents of the parameters in accordance with the contents of the capability information (parameter determination unit 267).
- One aspect of the present invention is a communication control method by a wireless base station that includes a first device and a second device and performs wireless communication with a user device, wherein the first device performs the capability of the user device.
- Acquiring the capability information to be indicated from the user apparatus via the radio resource control layer; transferring the acquired capability information to the second device by the first device; and the second device The steps of holding parameters for controlling wireless communication, the second device receiving the capability information transferred by the first device, and the second device based on the capability information received. And determining the content of the parameter according to the content of the capability information.
- FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10.
- FIG. 2 is an overall block diagram of the wireless communication system 10.
- FIG. 3 is a functional block diagram of the central unit 210.
- FIG. 4 is a functional block diagram of the distribution device 260.
- FIG. 5 is a conceptual diagram of a management operation of capability information (UE Capability) of the user device 300 by the central device 210 and the distribution device 260.
- FIG. 6 is a diagram illustrating an operation example (operation example 1) in which the distribution device 260 determines a parameter for controlling wireless communication with the user apparatus 300 based on the UE capability of the user apparatus 300.
- FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10.
- FIG. 2 is an overall block diagram of the wireless communication system 10.
- FIG. 3 is a functional block diagram of the central unit 210.
- FIG. 4 is a functional block diagram of the distribution device 260.
- FIG. 5 is a conceptual diagram of a management operation of capability information (UE Capability)
- FIG. 7 is a diagram illustrating an operation example (operation example 2) in which the distribution device 260 determines a parameter for controlling wireless communication with the user apparatus 300 based on the UE capability of the user apparatus 300.
- FIG. 8 is a diagram illustrating an operation example (operation example 3) in which the distribution device 260 determines a parameter for controlling wireless communication with the user apparatus 300 based on the UE capability of the user apparatus 300.
- FIG. 9 is a diagram illustrating an operation example (operation example 4) in which the distribution device 260 determines a parameter for controlling wireless communication with the user apparatus 300 based on the UE capability of the user apparatus 300.
- FIG. 10 is a diagram showing an example of the hardware configuration of the central apparatus 210 and the distribution apparatus 260.
- FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to the present embodiment.
- the wireless communication system 10 is a wireless communication system according to Long Term Evolution (LTE) and 5G (NR) which is a successor system to LTE.
- LTE Long Term Evolution
- NR 5G
- LTE (including LTE-Advanced) is appropriately referred to as "4G" from the viewpoint of making it correspond to 5G.
- the wireless communication system 10 realizes LTE assisted operation in which 5G complements 4G.
- the radio communication system 10 includes a core network 20, a radio base station 100, a radio base station 200, and a user apparatus 300.
- the core network 20 is also called Evolved Packet Core (EPC), and is configured of a mobility management entity (MME), a serving gateway (S-GW), a PDN gateway (P-GW), and the like.
- EPC Evolved Packet Core
- the radio base station 100 is a 4G radio base station and is also called an eNodeB.
- the radio base station 100 is connected to an apparatus (node) configuring the core network 20 via the S1-MME or S1-U interface.
- the radio base station 200 is a 5G radio base station and is also called gNodeB.
- the radio base station 200 is connected to the radio base station 100 via an X2 interface (here, conveniently referred to as X2-AP ', X2-U').
- the user apparatus 300 can perform wireless communication with the wireless base station 100 and the wireless base station 200.
- the user device 300 may be called a wireless communication terminal or a mobile station.
- the radio base station 200 and the user apparatus 300 perform massively MIMO beam generation with higher directivity by controlling radio signals transmitted from a plurality of antenna elements, and carrier aggregation using a plurality of component carriers (CCs). It is possible to support CA), dual connectivity (DC) in which component carriers are simultaneously transmitted between a plurality of radio base stations and a user apparatus 300, and the like.
- CA component carriers
- DC dual connectivity
- FIG. 2 is an overall block diagram of the wireless communication system 10.
- the radio base station 100 is configured by a central unit 110 and a remote unit 160.
- the radio base station 200 is configured by a central unit 210 and a distribution unit 260.
- the radio base station 100 and the radio base station 200 may include devices other than the central device and the distribution device.
- the central apparatus 210 constitutes a first apparatus
- the distribution apparatus 260 constitutes a second apparatus.
- FIG. 2 is an overall block diagram of the wireless communication system 10.
- the radio base station 100 is configured by a central unit 110 and a remote unit 160.
- the radio base station 200 is configured by a central unit 210 and a distribution unit 260.
- the radio base station 100 and the radio base station 200 may include devices other than the central device and the distribution device.
- the central unit 110 has a radio physical layer (L1), a medium access control layer (MAC), a radio link control layer (RLC), and a packet data convergence protocol layer (PDCP). Further, central apparatus 110 has a radio resource control layer (RRC) as an upper layer of PDCP.
- L1 radio physical layer
- MAC medium access control layer
- RLC radio link control layer
- PDCP packet data convergence protocol layer
- RRC radio resource control layer
- the remote device 160 can be remotely located projecting from the location of the central device 110.
- the remote device 160 includes a radio unit (RF) such as a power amplifier (PA) / low noise amplifier (LNA), a radio transmission / reception module, and a modulation / demodulation module.
- RF radio unit
- PA power amplifier
- LNA low noise amplifier
- the central unit 110 is also called a digital processing unit (Digital Unit (DU)) or a Central Unit (CU), and the remote unit 160 is also called a radio processing unit (Radio Unit (RU)) or a Remote Unit (RU).
- the central unit 110 and the remote unit 160 are connected by a wired transmission path called a front hole.
- a front hole As an interface between the central unit 110 and the remote unit 160, for example, Common Public Radio Interface (CPRI) is used.
- CPRI Common Public Radio Interface
- the central unit 210 and the distribution unit 260 correspond to the central unit 110 and the remote unit 160 described above, but have different layer configurations.
- the central unit 210 has a radio resource control layer (RRC).
- the distribution device 260 includes a radio link control layer (RLC), a medium access control layer (MAC), a radio physical layer (L1) and a radio unit (RF).
- RLC radio link control layer
- MAC medium access control layer
- L1 radio physical layer
- RF radio unit
- Such layer separation between the central unit 210 and the distribution unit 260 is called higher layer split (HLS).
- HLS higher layer split
- the central unit 210 is called a Central Unit (CU)
- the distribution unit 260 is called a Distributed Unit (DU).
- the central unit 210 is connected to the central unit 110 via the X2-AP 'and X2-U' interfaces.
- the central unit 210 takes charge of processing of the RRC / Service Data Adaptation Protocol (SDAP) / PDCP layer
- the distributing device 260 takes charge of processing of the layer below RLC. It is assumed.
- central apparatus 210 and the distribution apparatus 260 will be appropriately abbreviated as CU and DU.
- FIG. 3 is a functional block diagram of the central unit 210.
- the central apparatus 210 includes an X2 IF unit 211, a capability information acquisition unit 213, a capability information transfer unit 215, a parameter storage unit 217, and an F1 IF unit 219.
- the X2 IF unit 211 provides an interface for realizing communication with the central apparatus 110.
- the X2 IF unit 211 is an interface (X2) that directly connects the central apparatus 110 and the central apparatus 210. Transmission / reception data of the user apparatus 300 is relayed to the radio base station 100 via the X2 IF unit 211.
- the capability information acquisition unit 213 acquires capability information (UE Capability) indicating the capability of the user apparatus 300. Specifically, the capability information acquisition unit 213 releases the Access Stratum (AS) supported by the user device 300, and the maximum number of bits that can be transmitted and received per capability (for example, TTI (Transmission Time Interval)) for each UE Capability. , And layer 2 buffer size), frequency band (including band combination), and information indicating capability of the user apparatus 300 regarding carrier aggregation (CA) and the like.
- AS Access Stratum
- CA carrier aggregation
- the UE capability may be equivalent to, for example, the UE-EUTRA-Capability defined in 3GPP TS 36.331 chapter 6.3.6. Also, UE Capability may include 5G-specific capability information. Also, in the UE Capability, capability information that can be managed by the central unit 210 provided from the core network 20, for example, information related to UE type (UE type) and QoS (QoS Class Identifier) (QCI) etc. may be included.
- UE type UE type
- QoS QoS Class Identifier
- the capability information acquisition unit 213 acquires the capability information from the user apparatus 300 via the radio resource control layer (RRC). Specifically, the capability information acquisition unit 213 can acquire capability information included in an RRC message (for example, UE Capability information) transmitted by the user apparatus 300.
- RRC radio resource control layer
- the capability information transfer unit 215 transfers the capability information (UE Capability) acquired by the capability information acquisition unit 213 to the distribution device 260. Specifically, the capability information transfer unit 215 transfers the UE capability to the distribution device 260 via the F1 IF unit 219.
- the capability information transfer unit 215 can transfer only the capability information related to the determination of the parameter by the parameter determination unit 267 of the distribution device 260 described later to the distribution device 260. Specifically, the capability information transfer unit 215 transfers, to the distribution device 260, only the capability information of the user apparatus 300 that is required to determine the parameters held by the parameter holding unit 263 of the distribution device 260.
- modulation schemes 256 QAM, 64 QAM, etc.
- ue-CategoryDL / UL Chopter TS36.306 4.1A
- UE-EUTRA-Capability defined in Chapter 3GPP TS 36.331 6.3.6 corresponds.
- the capability information transfer unit 215 can decode the encoded capability information. In this case, the capability information transfer unit 215 transfers the decrypted capability information to the distribution device 260.
- the parameter holding unit 217 can hold a plurality of parameters for controlling wireless communication with the user device 300. Specifically, the parameter holding unit 217 basically holds UE-based parameters in accordance with Higher Layer Split (HLS). However, as described above, the UE capability is appropriately transferred to the distribution device 260.
- HLS Higher Layer Split
- the F1 IF unit 219 provides an interface for realizing communication between the central device 210 and the distributed device 260.
- the F1 IF unit 219 is an interface (referred to as F1) that directly connects the central apparatus 210 and the distribution apparatus 260. Transmission / reception data of the user device 300 is relayed to the distribution device 260 via the F1 IF unit 219.
- FIG. 4 is a functional block diagram of the distribution device 260. As shown in FIG. As shown in FIG. 4, the distribution device 260 includes an F1 IF unit 261, a parameter holding unit 263, a capability information receiving unit 265, a parameter determination unit 267, and a wireless communication unit 269.
- the F1 IF unit 26 similar to the F1 IF unit 219, provides an interface for realizing communication between the central apparatus 210 and the distribution apparatus 260.
- the parameter storage unit 263 can store a plurality of parameters for controlling wireless communication with the user device 300.
- the parameter holding unit 263 basically holds cell-based parameters in accordance with Higher Layer Split (HLS).
- HLS Higher Layer Split
- the UE capability is appropriately transferred from the central apparatus 210.
- the capability information reception unit 265 receives the capability information (UE Capability) transferred by the central apparatus 210. Specifically, the capability information reception unit 265 receives the UE capability via the F1 IF unit 261.
- the capability information reception unit 265 has a memory that temporarily holds the UE capability transferred by the central apparatus 210, and provides the UE capability held in the memory to the parameter determination unit 267.
- the capability information receiving unit 265 can receive the capability information encoded (RRC encoded) in the radio resource control layer.
- the capability information reception unit 265 decodes the received UE capability.
- the capability information reception unit 265 can also receive the capability information encoded in RRC from the user apparatus 300 instead of the central apparatus 210.
- the capability information receiving unit 265 decodes the capability information received from the user device 300.
- the parameter determination unit 267 determines the content of the parameter held by the distribution device 260 among the parameters for controlling the wireless communication with the user device 300. Specifically, the parameter determination unit 267 determines the content (set value) of the parameter held by the parameter holding unit 263.
- the parameter determining unit 267 determines the content of the parameter according to the content of the UE Capability.
- a maximum MCS Modulation and Coding Scheme determined based on a modulation scheme (256 QAM, 64 QAM, etc.) supported by the above-mentioned user apparatus 300 can be mentioned.
- the parameter determining unit 267 may truncate at least a part of the UE Capability.
- the parameter determination unit 267 holds the memory in the memory first.
- the UE Capability data that overflows from the memory may be discarded using part of the UE Capability being stored.
- the parameter determining unit 267 may notify the central unit 210 of the discarded or discarded amount, or the discarded portion.
- the central unit 210 may grasp the memory use status (or memory free capacity) in the distribution unit 260, and the central unit 210 may cut part of the information and transfer it to the distribution unit 260.
- the wireless communication unit 269 performs wireless communication with the user device 300. Specifically, the wireless communication unit 269 performs wireless communication with the user device 300 according to the 5G specification. As described above, the wireless communication unit 269 can support Massive MIMO, carrier aggregation (CA), dual connectivity (DC), and the like.
- Massive MIMO Massive MIMO
- CA carrier aggregation
- DC dual connectivity
- FIG. 5 is a conceptual diagram of a management operation of capability information (UE Capability) of the user apparatus 300 by the central apparatus 210 and the distribution apparatus 260.
- UE Capability capability information
- UE capabilities of the user apparatus 300 are transmitted and received between the central unit 210 (CU) and the distribution unit 260 (DU).
- the distribution device 260 determines the content of parameters for controlling wireless communication with the user device 300 based on the UE Capability received from the central device 210 (or the UE capability received directly from the user device 300).
- the parameters (parameters in units of cells) determined in the DU are also determined in consideration of the setting content of the UE capability. Also, in the present embodiment, an interface between CU and DU necessary for transmission and reception of such UE capability is provided.
- FIG. 6 shows an operation example (Operation Example 1) in which the distribution device 260 determines a parameter for controlling wireless communication with the user apparatus 300 based on the UE Capability of the user apparatus 300.
- the central unit 210 CU
- the central unit 210 obtains the UE capability transmitted by the user apparatus 300 (step 1). Specifically, the central unit 210 acquires UE Capability included in a message of RRC (for example, UE Capability information).
- RRC for example, UE Capability information
- UE Capability may be assumed to be UE-EUTRA-Capability (see 3GPP TS 36.331, Section 6.3.6). Also, the central apparatus 210 may acquire capability information (UE type, QCI, etc.) of the user apparatus 300 from the core network 20, for example, via the radio base station 100 instead of the user apparatus 300.
- capability information UE type, QCI, etc.
- the central unit 210 selects the UE capabilities to be transferred to the distribution unit 260 (step 2). Specifically, the central unit 210 selects an item to be transferred to the distribution device 260 among the items of the ability to configure the acquired UE capability.
- the central apparatus 210 can notify the distributed apparatus 260 of capability information related to the function to which the distributed apparatus 260 corresponds.
- the central apparatus 210 may select all items of the acquired UE Capability as transfer targets according to the criteria, or may select some items of the UE Capability as transfer targets.
- the central unit 210 transfers the selected UE capability to the distribution unit 260 (step 3).
- the distribution device 260 determines the content of the parameter for wireless communication control with the user device 300 based on the transferred UE capability (step 4). Specifically, the distribution device 260 determines the content of the wireless communication control parameter according to the content of the UE capability.
- the wireless communication control parameter may simply be called a wireless parameter.
- the distribution device 260 executes communication control for the user device 300 based on the contents of the determined wireless communication control parameter (step 5).
- the distribution device 260 may truncate at least a part of the UE capabilities transferred when the UE capabilities transferred by the central device 210 overflow.
- FIG. 7 illustrates an operation example (operation example 2) in which the distribution device 260 determines a parameter for controlling wireless communication with the user apparatus 300 based on the UE capability of the user apparatus 300.
- the central unit 210 CU decodes the acquired UE capability, and transfers the decoded UE capability to the distribution unit 260 (DU).
- CU central unit 210
- the central unit 210 acquires UE Capability as in the first operation example, but UE Capability is encoded (RRC encoded) (step 1, RRC encoded in the figure). That is, in the operation example 1, although the item of the capability to configure the UE capability may be directly transferred to the DU as an information element (IE), the UE capability included in the RRC-encoded user equipment 300 message is transferred to the DU If necessary, as in this operation example, the central unit 210 decodes the UE capability that has been RRC encoded.
- RRC encoded RRC encoded
- Step 2 is the same as the operation example 1, and the central unit 210 decodes the UE capability that has been RRC encoded (step 3).
- the central unit 210 transfers the selected UE capability to the distribution unit 260 (step 4).
- the transferred UE Capability is decoded (Decoded in the figure). Steps 5 and 6 of this operation example are the same as steps 4 and 5 of operation example 1.
- the distribution device 260 since the distribution device 260 does not have to decode the UE capabilities transferred from the central device 210 and only the necessary UE capabilities are transferred in the distribution device 260, the distribution device 260 is implemented. Power and performance can be reduced.
- the central unit 210 may not only decode the UE capability but also extract only the portion necessary for determining the wireless communication control parameter in the distributed device 260 among the items of the capability that requires transfer. . Furthermore, the central unit 210 may convert the extracted part into another format (such as Index format) different from the UE capability, and transfer the converted UE capability to the distribution unit 260.
- another format such as Index format
- FIG. 8 shows an operation example (Operation Example 3) in which the distribution device 260 determines a parameter for controlling wireless communication with the user apparatus 300 based on the UE Capability of the user apparatus 300.
- the distribution device 260 (DU) acquires the UE capability directly from the user apparatus 300 and decodes the acquired UE capability.
- portions different from the operation examples 1 and 2 will be mainly described.
- the distribution device 260 acquires the UE capability encoded (RRC encoded) from the user device 300 (step 1).
- RRC encoded UE capability encoded
- the distribution device 260 decodes the acquired UE Capability, and recognizes the content of the UE Capability (step 2).
- the distribution device 260 determines the content of the parameter for wireless communication control with the user device 300 based on the decoded UE Capability (step 3).
- Step 4 is the same as step 5 of the operation example 1.
- FIG. 9 shows an operation example (Operation Example 4) in which the distribution device 260 determines a parameter for controlling wireless communication with the user apparatus 300 based on the UE Capability of the user apparatus 300.
- the central unit 210 (CU) transfers the encoded UE capability to the distribution unit 260 (DU).
- CU central unit 210
- DU distribution unit 260
- Steps 1 and 2 shown in FIG. 9 are the same as steps 1 and 2 of the operation example 2.
- the central unit 210 transfers the selected UE capability to the distribution unit 260 (step 3).
- the transferred UE capabilities are not decoded but are encoded (RRC encoded) (RRC encoded in the figure).
- the distribution device 260 decodes the acquired UE Capability, and recognizes the content of the UE Capability (step 4).
- the distribution device 260 determines the content of the parameter for wireless communication control with the user device 300 based on the decoded UE Capability (step 5). Step 6 is the same as step 6 of the operation example 2.
- the central unit 210 since the central unit 210 does not need to decode the UE capability and transfer the decoded UE capability to the distribution unit 260, it may also contribute to the reduction of the capability and performance that the central unit 210 should implement.
- the central unit 210 transfers the UE capability acquired from the user device 300 to the distribution unit 260. Also, the distribution device 260 determines the content of the wireless communication control parameter according to the content of the UE capability based on the received UE capability.
- the central unit 210 manages the capability information (UE Capability) of the UE, which is a type of parameter for each user equipment (UE), and the distributed unit 260 (DU) determines the parameters affected by the capability information. Even when managing with the above, the distributed device 260 can determine appropriate parameters according to the content of the capability information.
- UE Capability capability information
- DU distributed unit 260
- the central unit 210 (capability information transfer unit 215) can transfer only the UE capability related to the determination of the wireless communication control parameter in the distribution unit 260 to the distribution unit 260.
- the capabilities and performance that the distributed device 260 should implement can be reduced.
- the amount of data transmitted and received between CU and DU can be suppressed.
- the distribution unit 260 when the UE Capability transferred by the central unit 210 overflows, the distribution unit 260 can truncate at least a part of the UE Capability. Therefore, the distributed device 260 can determine the wireless communication control parameters based on the UE capability while reducing the capability and performance that the distributed device 260 should implement.
- the central apparatus 210 (capability information transfer unit 215) can decode the UE Capability encoded in RRC and transfer the decoded UE Capability to the distribution apparatus 260. For this reason, the distributed device 260 does not have to decode the UE capabilities transferred from the central device 210, and only the required UE capabilities are transferred in the distributed device 260. Can be reduced.
- the distribution device 260 (capability information reception unit 265) can also receive the UE Capability encoded in RRC and decode the received UE Capability. As a result, only the necessary UE Capability is transferred in the distribution device 260, so the ability and performance to be implemented by the distribution device 260 can be reduced. On the other hand, since the central unit 210 does not need to decode the UE capability and transfer the decoded UE capability to the distribution unit 260, it may also contribute to the reduction of the capability and performance that the central unit 210 should implement.
- the distribution device 260 (the capability information reception unit 265) can also receive the capability information encoded in RRC from the user device 300 instead of the central device 210.
- the provision of the UE capability to the distribution device 260 can reduce the capability and performance to be implemented by the central device 210 since there is no need to go through the central device 210.
- HLS higher layer split
- the central unit 210 acquires the UE capability, and transfers the acquired UE capability to the distribution unit 260 (DU).
- the form does not have to be this way.
- the user apparatus 300 uses a DU (Physical Random Access Channel) frequency resource, a time resource, or a random access preamble (RA preamble) or a Msg 3 LCID (Logical channel ID) or the like.
- the UE's UE capability may be detected.
- the DU transfers (notifies) the detected corresponding UE Capability to the CU.
- the UE capability does not necessarily have to notify the CU.
- the user apparatus 300 simultaneously connects with a plurality of DUs (for example, dual connectivity), the UE capability is notified to another DU to which the user apparatus 300 connects via the CU, and is shared.
- the CU determines a parameter related to the UE capability
- the CU needs to notify the UE capability.
- each functional block may be realized by one physically and / or logically coupled device, or directly and / or indirectly two or more physically and / or logically separated devices. It connects (for example, wired and / or wirelessly), and may be realized by a plurality of these devices.
- FIG. 10 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.
- Each functional block (see FIGS. 3 and 4) of the device is realized by any hardware element of the computer device or a combination of the hardware elements.
- the processor 1001 operates, for example, an operating system to control the entire computer.
- the processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.
- CPU central processing unit
- the memory 1002 is a computer readable recording medium, and includes, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). It 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) capable of executing the method according to the above-described embodiment, a software module, and the like.
- the storage 1003 is a computer readable recording medium, and for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray A (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like may be used.
- the storage 1003 may be called an auxiliary storage device.
- the above-mentioned recording medium may be, for example, a database including the memory 1002 and / or the storage 1003, a server or other appropriate medium.
- the communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, or the like.
- the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside.
- the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside.
- the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured by a single bus or may be configured by different buses among the devices.
- notification of information is not limited to the above-described embodiment, and may be performed by another method.
- notification of information may be physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (for example, RRC signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (for example)). Master Information Block), SIB (System Information Block), other signals, or a combination of these, or RRC signaling may be referred to as an RRC message, eg, RRC Connection Setup message, RRC It may be a Connection Reconfiguration message or the like.
- DCI Downlink Control Information
- UCI Uplink Control Information
- RRC signaling for example, RRC signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (for example)
- MIB for example
- Master Information Block Master Information Block
- SIB System Information Block
- RRC signaling may be referred to as an RRC message, eg, RRC Connection Setup message, RRC It
- the input / output information may be stored in a specific place (for example, a memory) or may be managed by a management table. Information to be input or output may be overwritten, updated or added. The output information may be deleted. The input information may be transmitted to another device.
- the specific operation performed by the radio base station 200 may be performed by another network node (device). Also, the function of the radio base station 200 may be provided by a combination of a plurality of other network nodes.
- the channels and / or symbols may be signals, where relevant.
- the signal may be a message.
- the terms “system” and “network” may be used interchangeably.
- the parameter or the like may be represented by an absolute value, may be represented by a relative value from a predetermined value, or may be represented by another corresponding information.
- radio resources may be indexed.
- the radio base station 100 and the radio base station 200 can accommodate one or more (for example, three) cells (also referred to as sectors). If the 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 base station RRH for indoor use: Remote Communication service can also be provided by Radio Head.
- a base station subsystem eg, a small base station RRH for indoor use: Remote Communication service can also be provided by Radio Head.
- cell refers to a portion or all of the coverage area of a base station and / or a base station subsystem serving communication services in this coverage.
- base station eNodeB
- gNB gNodeB
- access point access point
- femtocell small cell, and so on.
- the user equipment 300 may be a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, by those skilled in the art. It may also be called a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.
- the phrase “based on” does not mean “based only on,” unless expressly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”
- any reference to an element using the designation "first,” “second,” etc. as used herein does not generally limit the quantity or order of those elements. These designations may be used herein as a convenient way of distinguishing between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be taken there, or that in any way the first element must precede the second element.
- the central unit manages capability information of the UE, which is a type of parameter for each user equipment unit (UE), and distributes parameters affected by the capability information. Even when managing with a device (DU), it is useful because the DU can determine an appropriate parameter according to the content of the capability information.
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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LTEの後継システムである5G(NR)に従った無線通信システムである。
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、中央装置210及び分散装置260の機能ブロック構成について説明する。
図3は、中央装置210の機能ブロック構成図である。図3に示すように、中央装置210は、X2 IF部211、能力情報取得部213、能力情報転送部215、パラメータ保持部217及びF1 IF部219を備える。
(QCI)など)が含まれてもよい。
図4は、分散装置260の機能ブロック構成図である。図4に示すように、分散装置260は、F1 IF部261、パラメータ保持部263、能力情報受信部265、パラメータ決定部267及び無線通信部269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、無線基地局200が、ユーザ装置300の能力情報(UE Capability)を管理する動作について説明する。
図5は、中央装置210及び分散装置260によるユーザ装置300の能力情報(UE Capability)の管理動作の概念図である。
図6は、ユーザ装置300のUE Capabilityに基づいて、分散装置260がユーザ装置300との無線通信を制御するパラメータを決定する動作例(動作例1)を示す。本動作例では、中央装置210(CU)は、取得したUE Capabilityを分散装置260(DU)に転送する。つまり、CU及びDUの両方が、UE Capabilityを管理(保持)する。
図7は、ユーザ装置300のUE Capabilityに基づいて、分散装置260がユーザ装置300との無線通信を制御するパラメータを決定する動作例(動作例2)を示す。本動作例では、中央装置210(CU)は、取得したUE Capabilityを復号し、復号したUE Capabilityを分散装置260(DU)に転送する。以下、動作例1と異なる部分について主に説明し、同様の部分については適宜説明を省略する。
図8は、ユーザ装置300のUE Capabilityに基づいて、分散装置260がユーザ装置300との無線通信を制御するパラメータを決定する動作例(動作例3)を示す。本動作例では、分散装置260(DU)は、ユーザ装置300から直接UE Capabilityを取得し、取得したUE Capabilityを復号する。以下、動作例1,2と異なる部分について主に説明する。
図9は、ユーザ装置300のUE Capabilityに基づいて、分散装置260がユーザ装置300との無線通信を制御するパラメータを決定する動作例(動作例4)を示す。本動作例では、中央装置210(CU)は、符号化されたUE Capabilityを分散装置260(DU)に転送する。以下、動作例1,2と異なる部分について主に説明する。
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、中央装置210は、ユーザ装置300から取得したUE Capabilityを分散装置260に転送する。また、分散装置260は、受信したUE Capabilityに基づいて、当該UE Capabilityの内容に応じた無線通信制御用パラメータの内容を決定する。
以上、実施形態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。
さらに、「基地局」「eNB」、「セル」、及び「セクタ」という用語は、本明細書では互換的に使用され得る。基地局は、固定局(fixed station)、NodeB、eNodeB(eNB)、gNodeB(gNB)、アクセスポイント(access point)、フェムトセル、スモールセルなどの用語で呼ばれる場合もある。
20 コアネットワーク
100 無線基地局
110 中央装置
160 遠隔装置
200 無線基地局
210 中央装置
211 X2 IF部
213 能力情報取得部
215 能力情報転送部
217 パラメータ保持部
219 F1 IF部
260 分散装置
261 F1 IF部
263 パラメータ保持部
265 能力情報受信部
267 パラメータ決定部
269 無線通信部
300 ユーザ装置
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 (7)
- 第1装置と第2装置とを含み、ユーザ装置との無線通信を実行する無線基地局であって、
前記第1装置は、
前記ユーザ装置の能力を示す能力情報を、無線リソース制御レイヤを介して前記ユーザ装置から取得する能力情報取得部と、
前記能力情報取得部が取得した前記能力情報を前記第2装置に転送する能力情報転送部と
を備え、
前記第2装置は、
前記無線通信を制御するパラメータを保持するパラメータ保持部と、
前記第1装置によって転送された前記能力情報を受信する能力情報受信部と、
前記能力情報受信部が受信した前記能力情報に基づいて、前記能力情報の内容に応じた前記パラメータの内容を決定するパラメータ決定部と
を備える無線基地局。 - 前記能力情報転送部は、前記パラメータ決定部による前記パラメータの決定に関連する前記能力情報のみを前記第2装置に転送する請求項1に記載の無線基地局。
- 前記パラメータ決定部は、前記第1装置によって転送された前記能力情報がオーバーフローすると判定した場合、前記能力情報の少なくとも一部を切り詰める請求項1に記載の無線基地局。
- 前記能力情報転送部は、前記無線リソース制御レイヤにおいて符号化された前記能力情報を復号し、復号した前記能力情報を前記第2装置に転送する請求項1に記載の無線基地局。
- 前記能力情報受信部は、前記無線リソース制御レイヤにおいて符号化された前記能力情報を受信し、受信した前記能力情報を復号する請求項1に記載の無線基地局。
- 前記能力情報受信部は、前記無線リソース制御レイヤにおいて符号化された前記能力情報を前記ユーザ装置から受信し、受信した前記能力情報を復号する請求項1に記載の無線基地局。
- 第1装置と第2装置とを含み、ユーザ装置との無線通信を実行する無線基地局による通信制御方法であって、
前記第1装置が、前記ユーザ装置の能力を示す能力情報を、無線リソース制御レイヤを介して前記ユーザ装置から取得するステップと、
前記第1装置が、取得した前記能力情報を前記第2装置に転送するステップと、
前記第2装置が、前記無線通信を制御するパラメータを保持するステップと、
前記第2装置が、前記第1装置によって転送された前記能力情報を受信するステップと、
前記第2装置が、受信した前記能力情報に基づいて、前記能力情報の内容に応じた前記パラメータの内容を決定するステップと
を含む通信制御方法。
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JP2019536769A JP7221869B2 (ja) | 2017-08-16 | 2018-08-13 | 無線基地局及び通信制御方法 |
EP18847036.3A EP3672303B1 (en) | 2017-08-16 | 2018-08-13 | Wireless base station and communication control method |
CA3071762A CA3071762A1 (en) | 2017-08-16 | 2018-08-13 | Radio base station and communication control method |
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CA3071762A1 (en) | 2019-02-21 |
US20200228964A1 (en) | 2020-07-16 |
JPWO2019035434A1 (ja) | 2020-09-03 |
EP3672303B1 (en) | 2023-11-29 |
PL3672303T3 (pl) | 2024-03-11 |
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