WO2015170630A1 - 移動局、基地局、上りリンクデータ量報告方法及び上りリンクデータのリソース割り当て方法 - Google Patents
移動局、基地局、上りリンクデータ量報告方法及び上りリンクデータのリソース割り当て方法 Download PDFInfo
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- WO2015170630A1 WO2015170630A1 PCT/JP2015/062718 JP2015062718W WO2015170630A1 WO 2015170630 A1 WO2015170630 A1 WO 2015170630A1 JP 2015062718 W JP2015062718 W JP 2015062718W WO 2015170630 A1 WO2015170630 A1 WO 2015170630A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
Definitions
- the present invention relates to a mobile station, a base station, an uplink data amount report method, and an uplink data resource allocation method.
- carrier aggregation CA: Carrier Aggregation
- CC Component Carrier
- a mobile station In carrier aggregation, a mobile station (UE: User Equipment) can communicate with a base station (eNB: evolved NodeB) using a plurality of component carriers simultaneously.
- eNB evolved NodeB
- a highly reliable primary cell PCell: Primary Cell
- SCell Secondary Cell
- the primary cell is a cell similar to the serving cell of the LTE system, and is a cell for ensuring connectivity between the mobile station and the network.
- the secondary cell is a cell that is added to the primary cell and set in the mobile station. The addition and deletion of the secondary cell are executed by RRC (Radio Resource Control) configuration.
- a mobile station divides one EPS (Evolved Packet System) bearer or packet sequence by a predetermined method, and divides each divided packet sequence into a plurality of base stations.
- Bearer splits Bearer Split
- eNB # 2 When receiving the divided packet sequence via CC # 2, eNB # 2, which is a non-anchor node base station, transfers the received packet sequence to eNB # 1, which is an anchor base station. Upon reception of the packet sequence transferred from eNB # 2, eNB # 1 reorders the packet sequence received via CC # 1 and the packet sequence received from eNB # 2, thereby receiving a packet sequence from the mobile station. And reconstructed packet sequence is transferred to a core node (CN: Core Node).
- CN Core Node
- CG Cell Group
- the semi-static data amount ratio setting method may not be able to improve the uplink throughput if the data amount ratio is not set appropriately. For example, when communication quality deteriorates and throughput sufficient to transmit data allocated to a certain cell cannot be realized, the data allocated to the cell stays in the transmission buffer that holds the uplink data to be transmitted Will do.
- an object of the present invention is to efficiently transmit uplink data in Dual Connectivity.
- a mobile station is: A mobile station that communicates using component carriers under a plurality of base stations, A receiving unit that receives setting information related to a method for reporting the amount of uplink data from the base station; A buffer state management unit for managing the amount of uplink data stored in the transmission buffer; A transmission control unit that selects a transmission destination base station of the data amount of the uplink data according to the setting information related to the method of reporting the data amount of the uplink data; A transmitter for reporting the amount of uplink data to the selected base station; It is characterized by having.
- a base station is: A base station in a wireless communication system in which a mobile station communicates using component carriers under the control of a plurality of base stations, A transmission unit for transmitting setting information related to a method for reporting the amount of uplink data; A resource allocation unit that allocates resources for transmitting uplink data according to setting information related to a method for reporting the amount of uplink data; It is characterized by having.
- An uplink data amount reporting method includes: An uplink data amount report method in a mobile station that communicates using component carriers under the control of a plurality of base stations, Receiving, from the base station, setting information related to a method for reporting the amount of uplink data, Managing the amount of uplink data stored in the transmission buffer; Selecting a transmission destination base station for the amount of uplink data according to the setting information regarding the method for reporting the amount of uplink data; Reporting the amount of uplink data to the selected base station; It is characterized by having.
- An uplink data resource allocation method includes: A resource allocation method for uplink data in a base station in a wireless communication system in which a mobile station communicates using component carriers under the control of a plurality of base stations, Transmitting configuration information regarding a method for reporting the amount of uplink data; Allocating resources for transmitting uplink data according to setting information related to a method for reporting the amount of uplink data, It is characterized by having.
- FIG. 3 is a sequence diagram illustrating a method for allocating uplink data resources according to an embodiment of the present invention. The flowchart which shows operation
- a communication system including a mobile station that performs communication using component carriers under the control of a plurality of base stations
- carrier aggregations a connection form in which mobile stations communicate using component carriers (CC) under the control of different base stations is called Dual Connectivity.
- Dual Connectivity a base station corresponding to a primary cell (PCell) is called a master base station (MeNB: Master eNB), and a base station corresponding to a secondary cell (SCell) is a secondary base station (SeNB: Secondary eNB). Called.
- BSR Buffer Status Report
- (A) Method of transmitting BSR to designated base station (FIG. 3A)
- the base station is prohibited from reporting the same amount of uplink data to both base stations by RRC signaling in advance (double BSR). Further, the base station designates a base station to which the mobile station should transmit uplink data. In this case, the mobile station transmits a BSR to the designated base station.
- (B) Method of transmitting BSR to any base station (FIG. 3B)
- the base station is prohibited from reporting the same amount of uplink data to both base stations in advance by RRC signaling.
- the base station does not designate a base station to which the mobile station should transmit uplink data. In this case, the mobile station transmits a BSR to any one of the base stations.
- the base station transmits setting information indicating any one of FIGS. 3A to 3C to the mobile station as a BSR reporting method.
- the mobile station selects a base station to which the BSR is transmitted according to the received setting information, and transmits the BSR to the selected base station.
- the wireless communication system includes a mobile station (UE) and a base station (MeNB and SeNB).
- the wireless communication system supports Dual Connectivity in which a mobile station performs simultaneous communication using component carriers CC # 1 and CC # 2 provided by a plurality of base stations.
- the mobile station has a Dual Connectivity function. Is used to communicate with the master base station (MeNB) and the secondary base station (SeNB).
- the mobile station has a Dual Connectivity function for simultaneous communication with multiple base stations.
- the mobile station may be any appropriate information processing apparatus having a wireless communication function such as a smartphone, a mobile phone, a tablet, or a mobile router.
- the mobile station includes a CPU (Central Processing Unit) such as a processor, a memory device such as a RAM (Random Access Memory) and a flash memory, a wireless communication device for transmitting and receiving wireless signals to and from the base station, and the like.
- a CPU Central Processing Unit
- a memory device such as a RAM (Random Access Memory) and a flash memory
- a wireless communication device for transmitting and receiving wireless signals to and from the base station, and the like.
- each function and process of the mobile station described later may be realized by the CPU processing or executing data or a program stored in the memory device.
- the mobile station is not limited to the hardware configuration described above, and may be configured by a circuit that realizes one or more of the processes described below.
- the base station wirelessly connects to the mobile station, thereby transmitting a downlink (DL) packet received from a network device such as an upper station or a server connected to a core network (not shown) to the mobile station.
- the uplink (UL) packet received from the mobile station is transmitted to the network device.
- one base station functions as a master base station (MeNB) or a primary base station, and the other base station functions as a secondary base station (SeNB).
- the master base station controls simultaneous communication by Dual-Connectivity between the mobile station and both base stations, and also controls communication with an upper core network (not shown).
- the master base station transmits setting information indicating one of FIGS. 3A to 3C to the mobile station as a BSR reporting method.
- FIG. 4 shows a configuration diagram of the base station 10 according to the embodiment of the present invention.
- the base station 10 is a master base station that sets a component carrier for a mobile station for simultaneous communication using Dual Connectivity.
- the base station 10 includes an uplink (UL) signal reception unit 101, a downlink (DL) signal transmission unit 103, a component carrier (CC) setting unit 105, and a resource allocation unit 107.
- UL uplink
- DL downlink
- CC component carrier
- the UL signal receiving unit 101 receives an uplink signal from a mobile station. For setting the component carrier, the UL signal receiving unit 101 receives a measurement result (MeasurementMeasureReport) of the radio quality from the mobile station. In addition, regarding the allocation of uplink data resources, the UL signal reception unit 101 receives a BSR indicating the amount of uplink data from the mobile station.
- a measurement result MeasurementMeasureReport
- the DL signal transmission unit 103 transmits a downlink signal to the mobile station.
- the DL signal transmission unit 103 transmits RRC signaling (RRC Connection Reconfiguration) including the component carrier setting information to the mobile station.
- RRC signaling RRC Connection Reconfiguration
- the component carrier setting information notified by RRC signaling includes setting information related to the BSR reporting method. Specifically, three methods shown in FIGS. 3A to 3C, that is, (A) a method of reporting a BSR to a designated base station among a master base station and a secondary base station (FIG. 3A), (B ) Either a method of reporting BSR to either the master base station or the secondary base station (FIG.
- the DL signal transmission unit 103 transmits resource allocation information (UL grant) indicating uplink data resources.
- UL grant resource allocation information
- CC setting section 105 manages component carriers set between mobile stations.
- CC setting section 105 sets the component carrier of the primary cell in response to a connection request (RRC Connection Request) from the mobile station.
- the CC setting part 105 sets the component carrier of a secondary cell based on the measurement result (Measurement
- the component carrier setting information is transmitted from the DL signal transmission unit 103 to the mobile station by RRC signaling.
- Resource allocation unit 107 allocates uplink resources based on the BSR received from the mobile station. However, when the BSR is specified to be transmitted to another base station (secondary base station) by the method shown in FIG. 3A or 3B, the resource allocation unit 107 needs to allocate uplink resources to the mobile station. There is no. In addition, when the method for reporting the BSR to both the master base station and the secondary base station is designated, the resource allocation unit 107 does not allocate duplicate resources in cooperation with other base stations (secondary base stations). It may be.
- FIG. 5 shows a configuration diagram of the mobile station 20 according to the embodiment of the present invention.
- the mobile station 20 includes a DL signal reception unit 201, a UL signal transmission unit 203, a CC setting unit 205, a transmission buffer unit 207, a buffer state management unit 209, and a transmission control unit 211.
- the DL signal receiving unit 201 receives a downlink signal from the base station.
- the DL signal receiving unit 201 receives RRC signaling (RRCRRConnection Reconfiguration) including component carrier setting information from the base station.
- RRC signaling RRCRRConnection Reconfiguration
- the component carrier setting information notified by RRC signaling includes setting information related to the BSR reporting method.
- the DL signal reception unit 201 receives resource allocation information (UL grant) indicating the resources of uplink data.
- the UL signal transmission unit 203 transmits an uplink signal to the base station.
- the UL signal transmission unit 203 transmits a measurement result (Measurement ⁇ Report) of the radio quality to the base station.
- the UL signal transmission unit 203 transmits a BSR indicating the amount of uplink data to the base station.
- CC setting section 205 sets a component carrier with the base station according to the component carrier setting information from the base station.
- CC setting section 205 sets the component carrier of the primary cell according to the component carrier setting information (RRC Connection Reconfiguration).
- RRC Connection Reconfiguration the component carrier setting information
- CC setting part 205 sets the component carrier of a secondary cell according to the setting information (RRC
- the transmission buffer unit 207 is a storage device that stores uplink data to be transmitted.
- the buffer status management unit 209 manages the amount of data stored in the transmission buffer unit 207. For example, the buffer state management unit 209 determines the number of bytes of data stored in the transmission buffer unit 207 and notifies the transmission control unit 211 of the determined number of bytes. Further, the buffer state management unit 209 monitors the amount of data stored in the transmission buffer unit 207 and notifies the transmission control unit 211 of the monitored data amount periodically or in response to occurrence of a predetermined notification event. May be. Further, the buffer state management unit 209 may detect the amount of data stored in the transmission buffer unit 207 in response to an instruction from the transmission control unit 211 and notify the transmission control unit 211 of the detected data amount. Good.
- the transmission control unit 211 selects a BSR transmission destination base station according to the setting information regarding the BSR reporting method.
- the transmission control unit 211 selects the designated base station as the transmission destination of the BSR when notified of the method (FIG. 3A) for reporting the BSR to the designated base station among the master base station and the secondary base station. To do.
- the BSR transmitted to the designated base station indicates the data amount of the uplink data managed by the buffer state management unit 209.
- the transmission control unit 211 sets the BSR transmission destination as the master base station and the secondary base station. Choose one.
- the master base station may be selected, the secondary base station may be selected, or the master base station and the secondary base station may be selected alternately or at a specific ratio for each transmission of the BSR.
- the amount of uplink data may be divided by the ratio when reporting the BSR. For example, when the master base station and the secondary base station are selected at a ratio of 4: 3, 4/7 of the amount of uplink data managed by the buffer state management unit 209 is reported to the master base station, 3/7 may be reported to the secondary base station.
- the transmission control unit 211 uses both the master base station and the secondary base station as the BSR transmission destination. Select. In this case, the BSR transmitted to both the master base station and the secondary base station indicates the data amount of the same uplink data managed by the buffer state management unit 209.
- FIG. 6 shows a method for allocating uplink data resources according to an embodiment of the present invention.
- the UL signal transmission unit 203 of the mobile station (UE) periodically transmits the measurement result (Measurement Report) of the radio quality to the master base station (MeNB) (step S101).
- the CC setting unit 105 of the master base station sets the component carrier of the primary cell or the secondary cell based on the measurement result (Measurement Report) of the radio quality, and the RRC signaling including the component carrier setting information from the DL signal transmission unit 103 (RRC Connection Reconfiguration) is transmitted (step S103).
- This RRC Connection Reconfiguration includes setting information related to the BSR transmission method.
- the CC setting unit 205 of the mobile station sets the component carrier according to the component carrier setting information, and when the setting of the component carrier is completed, the UL signal transmission unit 203 transmits a completion notification (RRC Connection) Reconfiguration Complete) to the base station. (Step S105).
- the buffer state management unit 209 of the mobile station When uplink data is generated in the mobile station, the buffer state management unit 209 of the mobile station notifies the transmission control unit 211 of the amount of data stored in the transmission buffer unit 207.
- the transmission control unit 211 of the mobile station selects a base station that is the transmission destination of the data amount of the uplink data according to the setting information regarding the BSR reporting method included in RRC Connection Reconfiguration, and the UL signal transmission unit 203 BSR indicating the amount of data is transmitted to the base station (step S107).
- the BSR is transmitted to both base stations, but according to the setting information regarding the BSR reporting method included in RRC Connection Reconfiguration, the BSR is a designated base station, one of the base stations, or It is transmitted to both base stations.
- the resource allocation unit 107 of the base station allocates uplink resources based on the BSR received from the mobile station, and transmits resource allocation information (UL grant) to the mobile station from the DL signal transmission unit 103 (step S109).
- UL grant is transmitted from both base stations, but UL grant is transmitted from the base station (designated base station, one of the base stations, or both base stations) that has received the BSR. Sent.
- FIG. 7 shows a flowchart showing the operation of the mobile station according to the embodiment of the present invention.
- the buffer state management unit 209 of the mobile station detects whether uplink data has occurred periodically or in response to the occurrence of a predetermined notification event (step S201), and when uplink data has occurred, Perform the following processing.
- the transmission control unit 211 confirms whether or not transmission of a BSR having the same data amount to both base stations (double BSR) is prohibited by the RRC configuration from the base station (step S203). If transmission of BSR to both base stations is not prohibited (step S203: NO), the transmission control unit 211 transmits the BSR having the same data amount to both base stations from the UL signal transmission unit 203 (step S203). S205).
- the transmission control unit 211 designates a base station that transmits uplink data, that is, a base station that transmits BSR. It is confirmed whether or not (step S207).
- the base station that transmits the BSR is designated (step S207: YES)
- the transmission control unit 211 transmits the BSR from the UL signal transmission unit 203 to the designated base station (step S209).
- the base station that transmits the BSR is not designated (step S207: NO)
- the transmission control unit 211 transmits the BSR from the UL signal transmission unit 203 to any one of the base stations (step S211).
- uplink data can be efficiently transmitted in dual connectivity. More specifically, it is possible to improve the throughput of uplink data per user as compared with the semistatic data amount ratio setting method.
- double BSR the method of transmitting BSR of the same amount of data to both base stations.
- the base station and the mobile station according to the embodiment of the present invention are described using functional block diagrams, but the base station and the mobile station according to the embodiment of the present invention may be hardware, software, or A combination thereof may be realized.
- the functional units may be used in combination as necessary.
- the method according to the embodiment of the present invention may be performed in an order different from the order shown in the embodiment.
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Abstract
Description
複数の基地局の配下のコンポーネントキャリアを用いて通信する移動局であって、
基地局から、上りリンクデータのデータ量の報告方法に関する設定情報を受信する受信部と、
送信バッファに格納されている上りリンクデータのデータ量を管理するバッファ状態管理部と、
上りリンクデータのデータ量の報告方法に関する設定情報に従って、上りリンクデータのデータ量の送信先の基地局を選択する送信制御部と、
選択された基地局に上りリンクデータのデータ量を報告する送信部と、
を有することを特徴とする。
移動局が複数の基地局の配下のコンポーネントキャリアを用いて通信する無線通信システムにおける基地局であって、
上りリンクデータのデータ量の報告方法に関する設定情報を送信する送信部と、
上りリンクデータのデータ量の報告方法に関する設定情報に従って、上りリンクデータを送信するためのリソースを割り当てるリソース割り当て部と、
を有することを特徴とする。
複数の基地局の配下のコンポーネントキャリアを用いて通信する移動局での上りリンクデータ量報告方法であって、
基地局から、上りリンクデータのデータ量の報告方法に関する設定情報を受信するステップと、
送信バッファに格納されている上りリンクデータのデータ量を管理するステップと、
上りリンクデータのデータ量の報告方法に関する設定情報に従って、上りリンクデータのデータ量の送信先の基地局を選択するステップと、
選択された基地局に上りリンクデータのデータ量を報告するステップと、
を有することを特徴とする。
移動局が複数の基地局の配下のコンポーネントキャリアを用いて通信する無線通信システムにおける基地局での上りリンクデータのリソース割り当て方法であって、
上りリンクデータのデータ量の報告方法に関する設定情報を送信するステップと、
上りリンクデータのデータ量の報告方法に関する設定情報に従って、上りリンクデータを送信するためのリソースを割り当てるステップと、
を有することを特徴とする。
基地局が事前にRRCシグナリングにより、同じ上りリンクデータのデータ量を双方の基地局に報告すること(double BSR)を禁止する。更に、基地局は、移動局が上りリンクデータを送信すべき基地局を指定する。この場合、移動局は、指定された基地局にBSRを送信する。
基地局が事前にRRCシグナリングにより、同じ上りリンクデータのデータ量を双方の基地局に報告することを禁止する。基地局は、移動局が上りリンクデータを送信すべき基地局を指定しない。この場合、移動局は、いずれかの基地局にBSRを送信する。
基地局が事前にRRCシグナリングにより、同じ上りリンクデータのデータ量を双方の基地局に報告することを許可する。この場合、移動局は、双方の基地局にBSRを送信する。
図3A~図3Cに示されるように、無線通信システムは、移動局(UE)及び基地局(MeNB及びSeNB)を有する。無線通信システムは、移動局が複数の基地局により提供されるコンポーネントキャリアCC#1,CC#2を用いて同時通信するDual Connectivityをサポートし、図示されるように、移動局は、Dual Connectivity機能を利用して、マスター基地局(MeNB)及びセカンダリ基地局(SeNB)と通信する。
図4に、本発明の実施例に係る基地局10の構成図を示す。基地局10は、Dual Connectivityによる同時通信のため、移動局に対してコンポーネントキャリアを設定するマスター基地局である。基地局10は、上りリンク(UL)信号受信部101と、下りリンク(DL)信号送信部103と、コンポーネントキャリア(CC)設定部105と、リソース割り当て部107とを有する。
図5に、本発明の実施例に係る移動局20の構成図を示す。移動局20は、DL信号受信部201と、UL信号送信部203と、CC設定部205と、送信バッファ部207と、バッファ状態管理部209と、送信制御部211とを有する。
図6に、本発明の実施例に係る上りリンクデータのリソース割り当て方法を示す。
本発明の実施例によれば、Dual Connectivityにおいて上りリンクデータを効率的に送信することが可能になる。より具体的には、セミスタティックなデータ量比率設定方法に比べて、ユーザ当たりの上りリンクデータのスループットを改善することが可能になる。
101 UL信号受信部
103 DL信号送信部
105 CC設定部
107 リソース割り当て部
20 移動局
201 DL信号受信部
203 UL信号送信部
205 CC設定部
207 送信バッファ部
209 バッファ状態管理部
211 送信制御部
Claims (8)
- 複数の基地局の配下のコンポーネントキャリアを用いて通信する移動局であって、
基地局から、上りリンクデータのデータ量の報告方法に関する設定情報を受信する受信部と、
送信バッファに格納されている上りリンクデータのデータ量を管理するバッファ状態管理部と、
上りリンクデータのデータ量の報告方法に関する設定情報に従って、上りリンクデータのデータ量の送信先の基地局を選択する送信制御部と、
選択された基地局に上りリンクデータのデータ量を報告する送信部と、
を有する移動局。 - 前記送信制御部は、上りリンクデータのデータ量をマスター基地局とセカンダリ基地局とのうち指定された基地局に報告する方法を示す設定情報が受信された場合、上りリンクデータのデータ量の送信先として、指定された基地局を選択する、請求項1に記載の移動局。
- 前記送信制御部は、上りリンクデータのデータ量をマスター基地局とセカンダリ基地局とのいずれかに報告する方法を示す設定情報が受信された場合、上りリンクデータのデータ量の送信先として、マスター基地局とセカンダリ基地局とのいずれかを選択する、請求項1に記載の移動局。
- 前記送信制御部は、上りリンクデータのデータ量をマスター基地局とセカンダリ基地局との双方に報告する方法を示す設定情報が受信された場合、上りリンクデータのデータ量の送信先として、マスター基地局とセカンダリ基地局との双方を選択する、請求項1に記載の移動局。
- 前記受信部は、マスター基地局からのRRC(Radio Resource Control)シグナリングにより設定情報を受信する、請求項1乃至4のうちいずれか1項に記載の移動局。
- 移動局が複数の基地局の配下のコンポーネントキャリアを用いて通信する無線通信システムにおける基地局であって、
上りリンクデータのデータ量の報告方法に関する設定情報を送信する送信部と、
上りリンクデータのデータ量の報告方法に関する設定情報に従って、上りリンクデータを送信するためのリソースを割り当てるリソース割り当て部と、
を有する基地局。 - 複数の基地局の配下のコンポーネントキャリアを用いて通信する移動局での上りリンクデータ量報告方法であって、
基地局から、上りリンクデータのデータ量の報告方法に関する設定情報を受信するステップと、
送信バッファに格納されている上りリンクデータのデータ量を管理するステップと、
上りリンクデータのデータ量の報告方法に関する設定情報に従って、上りリンクデータのデータ量の送信先の基地局を選択するステップと、
選択された基地局に上りリンクデータのデータ量を報告するステップと、
を有する上りリンクデータ量報告方法。 - 移動局が複数の基地局の配下のコンポーネントキャリアを用いて通信する無線通信システムにおける基地局での上りリンクデータのリソース割り当て方法であって、
上りリンクデータのデータ量の報告方法に関する設定情報を送信するステップと、
上りリンクデータのデータ量の報告方法に関する設定情報に従って、上りリンクデータを送信するためのリソースを割り当てるステップと、
を有する上りリンクデータのリソース割り当て方法。
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JP2016517876A JPWO2015170630A1 (ja) | 2014-05-07 | 2015-04-27 | 移動局、基地局、上りリンクデータ量報告方法及び上りリンクデータのリソース割り当て方法 |
CN201580021861.0A CN106233806A (zh) | 2014-05-07 | 2015-04-27 | 移动台、基站、上行链路数据量报告方法及上行链路数据的资源分配方法 |
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