WO2008072409A1 - 通信システム、通信装置及び通信方法、並びにコンピュータ・プログラム - Google Patents
通信システム、通信装置及び通信方法、並びにコンピュータ・プログラム Download PDFInfo
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- WO2008072409A1 WO2008072409A1 PCT/JP2007/069207 JP2007069207W WO2008072409A1 WO 2008072409 A1 WO2008072409 A1 WO 2008072409A1 JP 2007069207 W JP2007069207 W JP 2007069207W WO 2008072409 A1 WO2008072409 A1 WO 2008072409A1
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- 238000004891 communication Methods 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims description 33
- 238000004590 computer program Methods 0.000 title description 10
- 238000005516 engineering process Methods 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000012546 transfer Methods 0.000 abstract description 49
- 230000000875 corresponding effect Effects 0.000 description 11
- 241000652704 Balta Species 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 6
- 238000004422 calculation algorithm Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 230000006978 adaptation Effects 0.000 description 1
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- 238000007616 round robin method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/04—Scheduled access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
Definitions
- the present invention relates to a communication system, a communication apparatus and a communication method, and a computer for performing communication between a “host” such as a PC and a “device” that is a peripheral device such as a printer via a USB interface.
- a “host” such as a PC
- a “device” that is a peripheral device such as a printer via a USB interface.
- UWB Ultra Wide Band
- WUSB which adopts the multiband OFDM system promoted by the Wimedia Alliance as a standard for the physical layer and MAC layer
- the present invention relates to a communication system, a communication apparatus and a communication method for performing communication between a host and a device, and a computer program.
- the present invention relates to a communication system, a wireless communication apparatus and a wireless communication method, and a computer program that realizes isochronous transfer having priority over Balta transfer in WUSB, and in particular, isochronous transfer is performed.
- a communication system a wireless communication apparatus and a wireless communication method
- a computer program that realizes isochronous transfer having priority over Balta transfer in WUSB, and in particular, isochronous transfer is performed.
- V relates to a communication system, a wireless communication apparatus and a wireless communication method, and a computer program that perform priority communication in units of devices.
- USB Universal Serial Bus
- RS-232C serial port
- USB parallel port
- USB was initially designed by four companies, including Intel, Inc. The specifications are now being developed and managed by USB Implementers Forum, Inc. (USB—IF), now an NPO! /
- USB In USB, a specification group called a USB class is defined which is grouped according to functions of peripheral devices. Since devices created according to their respective class specifications provide the same functionality, class-compliant devices can be operated by class'drivers' and there is no need to have separate driver 'software for each device .
- USB is widely used as a technology that enables communication between a “host” such as a PC and a “device” that is a peripheral device such as a printer.
- Communication (transaction) using USB basically takes the form that scheduling is performed on the host side, communication is always started from the host side, and the device responds to this. Even when there is data to be sent from the device to the host, the device responds to inquiries from the host.
- both the host and device sides can have multiple logical channels (called “pipes” in USB) at the same time. The device partner is always the host. The end point of the pipe is called the end point.
- the USB supports a plurality of transfer modes so that it can be used for various purposes, and a different transfer mode can be designated for each noise.
- “Control transfer” mode is used for device configuration control
- “Interrupt transfer” mode is used to transfer small amounts of data from the keyboard and mouse in small chunks
- “Balta transfer” mode is used for storage devices and scanners. This is used to transfer a relatively large amount of data intermittently and reliably
- the “isochronous transfer” mode is used to transfer large amounts of data such as video and audio data.
- a priority relationship is defined between these transfer modes. For example, the isochronous transfer mode is prioritized over the balta transfer to guarantee the data transfer volume per unit time (however, in order to prevent the balta transfer from being completely stopped, the isochronous transfer mode is not used. There is an upper limit on the amount of occupancy). Also, all pipes with the same transfer mode are equal.
- USB is originally a transmission method using a wired cable, and USB 2.0, which realizes High Speed mode (maximum 480 Mbps) that can transfer at a speed exceeding IEEE1394 (maximum 400 Mbps) according to the standard, has become widespread. ing. Recently, the development of “Wireless USB”, which extends USB and combines wired safety, communication speed, and ease of use with wireless, is underway. For example, in consideration of many differences between wired USB and wireless USB, a mechanism for compensating a relatively significant error rate in wireless USB has been proposed (see, for example, Patent Document 1). thing).
- USB The wireless USB defined by IF (described above) is called “Certified Wireless Universal Serial Bus”.
- WUSB uses UWB (Ultra Wide Band), a wireless technology that uses ultra-wideband.
- UWB is a communication method that uses a very wide frequency band from 3.1 GHz to 10.6 GHz and realizes large-capacity wireless data transmission of about 100 Mbps at a short distance.
- I EEE802.15 3 and others have devised a UWB communication method that performs access control using a packet structure that includes a preamble.
- OFDM Orthogonal Frequency Division Multiplexing
- OFDM Orthogonal Frequency Division Multiplexing
- the band from 3.1 GHz to 10.6 GHz is divided into multiple subbands each having a width of 528 MHz, and frequency hopping (FH) is performed between the subbands.
- WUSB it is possible to communicate at a maximum speed of 480 Mbps at a communication range of 3 meters and at a maximum speed of 110 Mbps at 10 meters.
- WUSB uses a star topology and supports up to 127 devices on a single host.
- a digital camera operates as a device when connected to a computer, and operates as a host when sending an image directly to a printer.
- the bandwidth is managed using “Superframe” as a unit time, and one superframe further has 256 time slots (Media Access Slot: MAS). ).
- the WUSB host reserves the amount of MAS necessary for communication with the connected WUSB device (in other words, it does not reserve MAS from the WUSB device side). Since the isochronous transfer mode is processed with priority over other transfer modes, a certain amount of data transfer is guaranteed according to the number of MAS reservations for the WUSB cluster. However, it does not assign a specific MAS to exactly one pipe, but it is an implementation that changes the transaction schedule to some extent depending on the communication status!
- the MAC layer specification formulated by WiMedia is formulated so that, in addition to WUSB, higher layers such as Wirelessl394 and WiNet can simultaneously use multiband OFDM UWB. Has been. For this reason, it is assumed that two or more UWB communication systems with different upper layers coexist in the coverage area. In such cases, arbitration is performed in the MAC layer.
- the superframe is divided into 256 MASs and managed, and each upper layer using UWB reserves the necessary number of MASs for the MAC layer using Distributed Reservation Protocol (DRP). To do. Since each upper layer can occupy the reserved MAS, there is no interference between upper layers (for example, there is no interference between WUSB and Wireless 1394 or WiNet).
- DRP Distributed Reservation Protocol
- the WUSB host first estimates the bandwidth required for each WUS B device in order to calculate the number of required MASs. For example, for interrupt transfer or isochronous transfer, the required bandwidth is explicitly specified by the class driver of the WUSB device. On the other hand, since there is no explicit bandwidth specification for Balta transfer or control transfer, control such as dynamically increasing or decreasing the bandwidth allocated according to the queue length is required (however, this control algorithm is Since it is out of the scope of the present invention, detailed description is omitted here). When the WUSB host determines the number of MASs required for each WUSB device, it actually reserves the MASs using DRP.
- the use status of each MAS in the superframe is managed using the MAS management table (MAS Availability Information).
- MAS Availability Information the MAS usage status of each WUSB device is managed in the device information management table.
- the device information management table is provided with a device information entry including Device Availability Information consisting of a 256-bit bit mask for each WUSB device connected to the WUSB host (see Non-Patent Document 2, for example). )
- the procedure for communication management by the WUSB host using the MAS management table and the device information management table is as follows.
- Fig. 3 shows a configuration example of a device information management table used in the communication management procedure described above.
- Device Availability Info consists of a 256-bit length field, The MAS that can be executed by a chair is represented in bitmap format. In other words, in the MAS corresponding to the bit position written with 1 in the Device Availability Info field, the device is subject to transaction scheduling.
- FIG. 1 schematically shows the use status of the WUSB MAS in the superframe as indicated by Device Availability Info in Table 1. In the band indicated by the diagonal lines in the figure, all WUSB devices A to D in the WUSB cluster are candidates for S transactions.
- the WUSB specification defines a priority relationship between transfer modes (described above), and the bandwidth secured by the WUSB host is not evenly allocated to each WUSB device.
- WUSB can be transferred within the same time because the communication speed in the physical layer changes due to instability of the transmission path such as communication distance and communication status. The amount of data changes constantly. For this reason, in order to continue to guarantee the data transfer dormitory in the isochronous transfer mode, complicated control such as adding MAS reservation or ensuring the stability of the transmission path by link adaptation is required. .
- Patent Document 1 Japanese Patent Application Laid-Open No. 2006-216015
- Non-patent document 1 Wireless Universal serial Bus specification (May 12, 20 05 Revisionl. 0)
- Non-Patent Document 2 Wireless Host Controller Interface (WHCI) Specificatio for Certified Wireless Universal Serial Bus (June 16, 2006 Revisi onO. 95)
- WHCI Wireless Host Controller Interface
- An object of the present invention is to apply UWB, which is a radio technology using ultra-wideband, and to use WUSB that adopts the multiband OFD M system promoted by the Wimedia Alliance as a standard for the physical layer and the MAC layer. It is an object of the present invention to provide an excellent communication system, communication apparatus and communication method, and computer program that can suitably perform communication between a host and a device.
- a further object of the present invention is to provide an excellent communication system, communication apparatus and communication method, and computer program capable of performing priority communication on a device basis in a WUSB communication environment where isochronous transfer cannot be used. It is to provide.
- the present invention has been made in consideration of the above-mentioned problems.
- the first aspect of the present invention is that a bandwidth is reserved in units of a predetermined time slot for each superframe, and a plurality of devices are used.
- a communication system in which each device shares a time slot reserved in the cluster, time slot reservation means for reserving one or more time slots in a superframe for the cluster, and the reserved time This is a communication system characterized by comprising a time slot allocation means for allocating slots with a difference in transaction opportunities between devices in a cluster.
- system refers to a plurality of devices (or a function module for realizing a specific function). Yule refers to a logical collection of items, and whether or not each device or functional module is in a single enclosure is particularly questionable! / ⁇ (hereinafter the same).
- USB which is widely used as a general-purpose bus' interface standard, supports a plurality of transfer modes with priority relationships, and can specify different transfer modes for each pipe.
- WUSB which is formulated and managed by USB-IF, is representative.
- each pipe having the same transfer mode is treated fairly.
- a Balta transfer addressed to WUSB device A and a Balta transfer addressed to WUSB device B can send data at the same rate. This is achieved by the WUSB host acquiring MAS in a batch and scheduling the communication of each pipe fairly. Usually, scheduling such as round robin is used.
- the WUSB host is simultaneously used by a plurality of network upper layers adopting a physical layer and a MAC layer established by WiMedia Alliance, and from the superframe, Reserve the MAS to be used in the WUSB cluster, and allocate the reserved MAS with a difference in transaction opportunity between devices in the cluster! /.
- the WUSB host has a device information entry table (Device Availability Info) in which a MAS that can execute a transaction is described in a bit map format for each WUSB device in the WUSB cluster. Is used to manage the bandwidth allocation of MAS reserved in the super frame, but at least a part of the reserved MAS is allocated only to a specific WUSB device. In other words, instead of copying the contents of the MAS reserved in the WUSB cluster as it is to the device information entry for each WUSB device, all the MASs secured as the WUSB cluster should be copied. Share with all WUSB devices!
- Each WUSB device is assigned to a MAS marked in its device information entry.
- Transaction 'schedule subject In other words, when the time slot reserved for the WUSB cluster is reached in the superframe, the device information entry is referred to, and the device information entry indicates that the transaction can be executed. When transaction execution starts, transaction scheduling is performed.
- the WUSB host accepts transaction requests from applications and class drivers that use each WUSB device, and is based on the total bandwidth required for the transactions of each WUSB device in the WUSB cluster. ! /, Determine the number of time slots needed by the WUSB cluster, and reserve time slots in the superframe.
- the WUSB host registers the device information entry of each WUSB device in accordance with the number of time slots required for the transaction of each WUSB device in the WUSB cluster. For example, if the number of time slots required between WUSB devices is not uniform, such as when some pipes are in the isochronous transfer mode, at least some of the MAS reserved by the WUSB cluster will be assigned to a specific WUSB device. By assigning only to, there is a difference in transaction opportunities between WUSB devices.
- the second aspect of the present invention provides a process for performing bandwidth reservation in a cluster composed of a plurality of devices in a communication environment in which a plurality of network upper layers simultaneously use a superframe.
- a computer 'program written in a computer readable form for execution on a computer the computer allocating a time slot reservation procedure for the computer to reserve one or more time slots in a superframe for a cluster;
- a computer program according to the second aspect of the present invention is a predetermined process on a computer. It defines a computer 'program written in a computer-readable format to realize the logic.
- a cooperative action is exerted on the computer, and in the communication system according to the first aspect of the present invention, within the cluster. It is possible to operate as a host that oversees the operation of S.
- some of the MASs acquired by the WUSB host belong to a specific WUSB device by setting a scheduling mechanism of the WUSB host so that only a specific WUSB device can be used. Pipes are prioritized. Therefore, according to the present invention, it is possible to provide an excellent communication system, communication apparatus and communication method, and computer program capable of performing priority communication on a device basis in a WUSB communication environment in which isochronous transfer cannot be used. Can do.
- FIG. 1 is a functional block diagram for performing communication management using a MAS management table and a device information management table in a WUSB communication system.
- FIG. 2 is a diagram schematically showing the state of MAS usage of WUSB in the super frame indicated by Device Availability Info in Table 3.
- FIG. 3 is a diagram schematically showing the WUSB MAS usage status in the superframe indicated by Device Availability Info in Table 1.
- the present invention relates to a WUSB communication system using multiband OFDM UWB.
- WUSB uses the physical layer and MAC layer established by the WiMedia Alliance, and other upper layers such as Wirelessl394 and WiNet can be used simultaneously.
- WiMedi a Alliance, a network is operated every superframe of a predetermined time. Each superframe is further divided into 256 MASs, and the upper layer itself Reserve MAS to use.
- the WUSB host reserves the required number of MASs and performs transaction scheduling for each WUSB device in the W USB cluster.
- FIG. 1 shows a functional block diagram for performing communication management using the MAS management table and the device information management table in the WUSB communication system.
- Each functional block in the figure is implemented on, for example, a WUSB host that controls a single WUSB cluster.
- the class' driver is software for realizing a function specific to each device (in the case of a printer, data is sent and printed). For example, an application such as a spreadsheet calls a printer class 'driver to perform printing, or calls a mass storage class' driver to read or write a file. Upper layers such as class driver applications require transactions to communicate with WUSB devices.
- the MAS management table is a table that describes the reservation status of MASs in superframes in the upper layers of multiple networks that simultaneously use multiband OF DM UWB such as WUSB, Wirelessl394, and WiNet, and is managed in the MAC layer. ing .
- WUSB the host centrally reserves the MAS in the MAS management table.
- Table 2 shows an example of the structure of the MAS management table.
- each entry is provided in the MAS management table for each upper layer that requests a bandwidth in the superframe, and each entry is a 256-bit bit corresponding to each MAS in the superframe.
- MAS reservation status is managed using a map.
- the bit is set to 1 in the MAS position reserved for the WUSB cluster.
- the corresponding bit position of the “Other” upper layer entry is marked.
- another WUSB cluster another WUSB host and a WUSB device connected to it
- reserves the MAS reserves the MAS, The corresponding bit position of the “other” upper layer entry is marked.
- the MAS reservation in the MAS management table is exclusive and the same bit position is not marked across two or more entries.
- the device information management table conforms to the WHCI specification (for example, see Non-Patent Document 2) and the HWA specification (for example, refer to 8. 5. 3. 7 of Non-Patent Document 1).
- the MAS in which the device can execute transactions is shown in bitmap format. That is, each WUSB device is subject to a transaction 'schedule in the MAS corresponding to the bit position where 1 is written in its Device Availability Info field (described above).
- the device information management table assumes the same configuration as that shown in Table 1, and an entry is provided for each WU SB device connected to the WUSB host.
- the Device Availability Info field indicating the location of the available MAS of the WUSB device to be used and other information (encryption key, address, etc.) are recorded.
- the communication management unit queues transaction requests from higher layers.
- the communication management unit analyzes the transaction request from the upper layer, calculates the number of MAS required for communication with the WUSB device, and controls the registration of the reserved MAS by referring to the MAS management table. Do. Then, the reserved MAS is assigned to each WUSB device and registered in the device information management table. In normal WUSB, the same MAS information (that is, the entire MAS group reserved for the WUSB cluster) is registered in all entries in the device information management table (described above).
- Transaction 'The scheduler manages the transaction schedule of each WUSB device for each superframe. Specifically, when the MAS reserved by the WUSB host in the superframe is reached, one device is selected from the device group that has a transaction request in the queue, and the transaction is executed. At this time, referring to the device information management table, the MAS cannot be used! /, WUSB device (ie, a device that is not subject to transaction 'schedule where 1 is not written in the bit position corresponding to MAS) Is excluded. In addition, a WUSB device that can use the MAS.
- WUSB controller chip specifications such as WHCI (see Non-Patent Document 2) stipulate that the round robin method is used for Balta transfer.
- the WUSB host copies the contents of the MAS reserved in the MAS management table to the Device Availability Info of all entries in the device information management table as they are.
- the bitmap that represents the MAS assigned to the WUSB cluster on the MAS management table and the Device Availability Info bitmap for each device in the device information management tape node in the WUSB cluster have the same contents. All devices in the WUSB cluster will be given a fair transactional chance to the device.
- the communication management unit does not share the reserved MAS in the MAS management table with all WUSB devices, but at least a part of the reserved MAS. Is assigned only to specific WUSB devices (specifically, devices that use high-priority communications). In other words, the communication management unit changes the contents of Device Availability Info for each device that does not directly copy the contents of the MAS reserved in the MAS management table to the Device Availability Info of all entries in the device information management table.
- the communication management unit registers only one fifth of the MASs secured in the MAS management table in the Device Availability Info of Device A, and the other one fifth of the Device Availability of Device B. Register with Info, and register the rest with Device Availability Info for all devices in the WUSB cluster.
- some MASs interpret that only a specific WUSB device that can be shared by all WUSB devices in the WUSB cluster can execute transactions. The transaction 'scheduler inevitably selects the specific WUSB device when selecting a communication partner in some of these MASs.
- Table 3 below shows a configuration example of a device information management table when the contents of Device Availability Info are changed for each device.
- Each WUSB device is subject to a transaction schedule in the MAS marked in its Device Availability Info field (described above). Therefore, in some MASs, only specific devices are subject to transaction scheduling. In the example shown in Table 3, only the device A is transactional for the MAS marked only for device A. Scheduled, and only the device C is the transaction for the MAS marked only for device C. Device B In a MAS marked with and D, both devices B and D are subject to transaction scheduling.
- FIG. 2 schematically shows the WUSB MAS usage status in the superframe indicated by Device Availability Info in Table 3.
- time slot group # 1 only device A is a candidate for transaction, and in time slot groups # 2-1 and # 2-2, each device A to D is a candidate for transaction.
- group # 3 only device C is a candidate for transaction, and in time slot group # 4, devices B and D are candidates for transaction.
- the device information management table describes the transaction schedule within the WUSB cluster, and is changed on the MAS management table that manages the MAS reservation status with other upper layers. There is no.
- the bitmap that is the logical sum of Device Availability Info of each entry in the device information management table is the MAS management table.
- Table 4 shows the contents of the MAS management table that matches the device information management table shown in Figure 2.
- the communication management unit adds an entry for the device to the device information management table.
- the application or class' driver that uses the WUSB device specifies the bandwidth required for communication. If the bandwidth is not specified, the required bandwidth is estimated by referring to the length of the queue that holds the transaction waiting to be processed. If multiple end points are used at the same time, the specified or estimated bandwidths are summed. Then, the communication management unit registers the total bandwidth in the corresponding entry of the device information management table.
- the communication management unit registers the current communication speed (physical layer rate) with each WUSB device in the corresponding entry of the device information management table.
- the communication management unit calculates the number of MAS required for each device based on the physical layer rate and required bandwidth of each WUSB device. At the same time, the total number of required MASs is calculated.
- the communication management unit refers to the MAS management table and obtains the number of MASs already reserved.
- the communication management unit compares the number of necessary MASs with the number of reserved MASs. If the number of MAS is insufficient, DRP is used to reserve a free MAS. If there is an unnecessary MAS, the MAS is released. The reservation or release result is reflected in the MAS management table. (7) The communication management unit sets the location of the MAS where the device can be used, for Device Availability Info of each entry in the device information management table. If there is a device that started the transaction preferentially! /, Prepare a MAS that can be used only by some devices according to the number of MASs that the device needs.
- the algorithm for assigning each MAS reserved by the WUSB host on the MAS management table to the device in the WUSB cluster is not particularly limited.
- the class' driver notifies the communication management unit of the bandwidth required for requesting the transaction, and the communication management unit calculates the number of MASs necessary to send the bandwidth and calculates the device availability.
- the position of the MAS to be marked may be selected randomly.
- the necessary bandwidth may be notified independently of exchanging the transaction request, or if the bandwidth that was originally attached to the transaction request in the isochronous transfer mode is diverted! You can use this method! / In the latter case, the power that appears to be using the isochronous transfer mode from the class' driver is actually possible using the Balta transfer.
- a method for determining which device's transaction is given priority is also arbitrary.
- the device to prioritize the transaction can be determined by any of the following methods.
- Method 1 The application or class' driver notifies the communication management unit that “desired priority communication”.
- Method 2 Using the management tool, set information on which device the WUSB host administrator should prioritize in the communication manager.
- Method 3 A predetermined algorithm is incorporated into the communication management unit. For example, if the queue length is less than a certain value Adopt an algorithm that gives a priority communication system to the device above.
- the power described above centering on the embodiment applied to WUSB is not limited to this.
- the present invention can be similarly applied to various communication systems that reserve bandwidth in units of time slots at predetermined time intervals and share reserved time slots with devices in one cluster (or network).
- the application range is not limited to wireless communication, but includes various communication technologies.
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EP07828947A EP2093938A1 (en) | 2006-12-15 | 2007-10-01 | Communication system, communication device and communication method, and computer program |
CN2007800463764A CN101558672B (zh) | 2006-12-15 | 2007-10-01 | 通信系统、通信装置、通信方法 |
US12/519,047 US20100180058A1 (en) | 2006-12-15 | 2007-10-01 | Communication System, Communication Apparatus, Communication Method, and Computer Program |
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JP2006339236A JP2008153898A (ja) | 2006-12-15 | 2006-12-15 | 通信システム、通信装置及び通信方法、並びにコンピュータ・プログラム |
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WO2010013152A1 (en) * | 2008-07-28 | 2010-02-04 | Koninklijke Philips Electronics, N.V. | A group shared distributed reservation protocol |
JP5262535B2 (ja) * | 2008-10-01 | 2013-08-14 | 株式会社リコー | ワイヤレスusbホスト装置 |
US9202308B2 (en) * | 2011-12-28 | 2015-12-01 | Think Silicon Sa | Methods of and apparatus for assigning vertex and fragment shading operations to a multi-threaded multi-format blending device |
US9058680B2 (en) * | 2011-12-28 | 2015-06-16 | Think Silicon Ltd | Multi-threaded multi-format blending device for computer graphics operations |
US9378177B2 (en) * | 2012-07-06 | 2016-06-28 | Texas Instruments Incorporated | WiFi USB protocol |
KR20140119565A (ko) | 2013-04-01 | 2014-10-10 | 삼성전자주식회사 | 무선 통신 기반의 범용 직렬 버스 서비스를 위한 디바이스 및 그 연결 관리 방법 |
KR102133526B1 (ko) * | 2013-10-31 | 2020-07-13 | 삼성전자주식회사 | USB 어플리케이션 데이터의 QoS를 고려한 무선 전송 지원 기법 |
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US7181223B1 (en) * | 2000-06-21 | 2007-02-20 | Motorola, Inc. | Method for rapid uplink access by GSM GPRS/EDGE mobile stations engaged in voice over internet protocol packet transfer mode |
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JP4672674B2 (ja) * | 2004-02-06 | 2011-04-20 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | アドホックネットワーク用のビーコンプロトコル |
BRPI0508535A (pt) * | 2004-03-08 | 2007-08-14 | Koninkl Philips Electronics Nv | método e aparelho de computador principal, para comunicação computador principal-dispositivo em uma primeira rede wusb |
US20060072487A1 (en) * | 2004-09-22 | 2006-04-06 | Howard John S | Power conservation for a wireless device |
CN1859050A (zh) * | 2004-10-13 | 2006-11-08 | 三星电子株式会社 | 在分布式无线个域网中的装置和数据时隙分配方法 |
KR20070086975A (ko) * | 2004-12-09 | 2007-08-27 | 코닌클리즈케 필립스 일렉트로닉스 엔.브이. | 복수의 장치들 간의 공유 매체의 대역폭을 공유하는 방법과공유 매체 액세스 장치 |
KR100694298B1 (ko) * | 2005-12-08 | 2007-03-14 | 한국전자통신연구원 | 무선 유에스비 접속을 위한 무선 근거리 통신망 콤보액세스 포인트 장치 및 방법, 그리고 그 장치에서의소프트웨어 계층 구조 |
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JP2002217912A (ja) * | 2001-01-05 | 2002-08-02 | Samsung Electronics Co Ltd | 無線通信機器及びこれを適用した無線通信システム並びにその通信方法 |
JP2006216015A (ja) | 2004-12-03 | 2006-08-17 | Microsoft Corp | 無線usbハードウェアのスケジューリング |
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TWI368849B (ja) | 2012-07-21 |
TW200832148A (en) | 2008-08-01 |
CN101558672B (zh) | 2013-01-02 |
EP2093938A1 (en) | 2009-08-26 |
JP2008153898A (ja) | 2008-07-03 |
US20100180058A1 (en) | 2010-07-15 |
CN101558672A (zh) | 2009-10-14 |
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