WO2014188499A1 - Appareil et procédé de relais radio et terminal radio - Google Patents

Appareil et procédé de relais radio et terminal radio Download PDF

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Publication number
WO2014188499A1
WO2014188499A1 PCT/JP2013/063976 JP2013063976W WO2014188499A1 WO 2014188499 A1 WO2014188499 A1 WO 2014188499A1 JP 2013063976 W JP2013063976 W JP 2013063976W WO 2014188499 A1 WO2014188499 A1 WO 2014188499A1
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WIPO (PCT)
Prior art keywords
data
wireless terminal
access point
wireless
priority
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PCT/JP2013/063976
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English (en)
Japanese (ja)
Inventor
隆雄 清水
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富士通株式会社
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Priority to PCT/JP2013/063976 priority Critical patent/WO2014188499A1/fr
Publication of WO2014188499A1 publication Critical patent/WO2014188499A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
    • H04L67/61—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources taking into account QoS or priority requirements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]

Definitions

  • the present invention relates to a wireless relay device, a wireless terminal, and a wireless relay method.
  • the ad hoc configuration is a configuration in which wireless terminals communicate with each other on a one-to-one basis.
  • a distributed control method (DCF: Distributed Coordination Function) is used.
  • the infrastructure configuration is a configuration for performing communication between an AP (Access Point) and a wireless terminal.
  • Inflation configurations include a distributed control method (DCF) and an AP centralized control method (PCF: Point Coordination Function).
  • QoS guarantee there is IEEE 802.11e.
  • CSMA / CA Carrier Sense Multiple Access / Collision Avoidance
  • CD Carrier Sense Multiple Access / Collision Detection
  • PCF controls transmission on the wireless terminal side on the AP side.
  • polling is applied to each wireless terminal, so the load on the AP side is large.
  • IEEE802.11e Although a bandwidth guarantee system called IEEE802.11e has been standardized for QoS guarantee, IEEE802.11e is a bandwidth reservation method, control is complicated, and bandwidth efficiency is not improved.
  • an object of the present invention is to provide a wireless communication method that efficiently uses a bandwidth in wireless communication.
  • the first aspect is A wireless relay device wirelessly connected by one or more wireless terminals, An application request for requesting the wireless terminal to notify the size of data scheduled to be transmitted at a predetermined cycle and the priority of the data is transmitted to the wireless terminal, and a response to the application request is received from the wireless terminal.
  • a wireless communication unit A controller that generates schedule information for assigning a time for transmitting the data in the cycle based on the size of the data included in the response and the priority of the data;
  • the control unit controls the wireless communication unit to transmit the schedule information to the wireless terminal, and performs data transmission / reception control with the wireless terminal based on the schedule information.
  • a wireless relay device is assumed.
  • the above-described aspect may be realized by executing a program by the information processing apparatus. That is, the processing executed by each unit in the above-described aspect can be specified as a program for causing the information processing apparatus to execute, or a computer-readable recording medium on which the program is recorded. Moreover, you may identify with the method which an information processing apparatus performs the process which each above-mentioned means performs.
  • FIG. 1 is a diagram illustrating an example of a configuration of a system according to the present embodiment.
  • FIG. 2 is a diagram illustrating a configuration example of the access point 100.
  • FIG. 3 is a diagram illustrating a configuration example of the wireless terminal 200.
  • FIG. 4 is a diagram illustrating an example (1) of the operation sequence of the present embodiment.
  • FIG. 5 is a diagram illustrating an example (2) of the operation sequence of the present embodiment.
  • FIG. 6 is a diagram illustrating an example (3) of the operation sequence of the present embodiment.
  • FIG. 7 is a diagram illustrating an example of basic information.
  • FIG. 8 is a diagram illustrating an example of packet transmission time.
  • FIG. 9 is a diagram illustrating an example of a priority data schedule.
  • FIG. 1 is a diagram illustrating an example of a configuration of a system according to the present embodiment.
  • FIG. 2 is a diagram illustrating a configuration example of the access point 100.
  • FIG. 3 is a diagram illustrating a configuration example
  • FIG. 10 is a diagram illustrating an example of a schedule of best effort data.
  • FIG. 11 is a diagram illustrating an example of a voice sample period, codec time, and voice data transmission time at an access point in a wireless terminal.
  • FIG. 12 is a diagram illustrating an example of the relationship between the basic period and priority data.
  • FIG. 13 is a diagram illustrating an example of the relationship between the basic period and the priority data in the first modification.
  • FIG. 14 is a diagram illustrating an example of a voice sample period, a codec time, and a voice data transmission time at an access point in the wireless terminal according to the first modification.
  • FIG. 15 is a diagram illustrating an example of a relationship between a basic period and priority data in the second modification.
  • FIG. 1 is a diagram illustrating an example of a configuration of a system according to the present embodiment.
  • the system of the present embodiment includes an access point (AP) 100, a radio terminal 200A, and a radio terminal 200B.
  • Access point 100 and wireless terminal 200A are wirelessly connected.
  • Access point 100 and wireless terminal 200B are wirelessly connected.
  • the radio terminal 200A and the radio terminal 200B have the same configuration.
  • the radio terminal 200A and the radio terminal 200B are not distinguished, they are collectively referred to as the radio terminal 200.
  • the number of wireless terminals is not limited to two, and may be one or three or more.
  • the access point 100 is connected to a higher level network (WAN: Wide Area Network).
  • WAN Wide Area Network
  • FIG. 2 is a diagram illustrating a configuration example of the access point 100.
  • the access point 100 includes a CPU 102, a memory 104, a WiFi interface 106, a NIC (Network Interface Card) 108, and an antenna 110.
  • the access point 100 is an example of a wireless relay device.
  • the CPU 102 controls the access point 100 and performs a predetermined calculation.
  • the CPU 102 processes transmission / reception data with other communication devices.
  • the CPU 102 is an example of a control unit.
  • the CPU 102 creates a schedule.
  • the memory 104 stores a program executed by the CPU 102, data used by the CPU 102, and the like.
  • the memory 104 stores data to be transmitted and received, a schedule, and the like.
  • the WiFi interface 106 is an interface for wireless connection with other wireless devices such as the wireless terminal 200.
  • the WiFi interface 106 is an example of a wireless communication unit.
  • the NIC (Network Interface Card) 108 is an interface for connecting the access point 100 to a higher level network.
  • the access point 100 is connected to the host device via the NIC 108 and the network.
  • the access point 100 transmits and receives data to and from the host device via the NIC 108.
  • the antenna 110 receives a radio signal transmitted from another radio apparatus such as the radio terminal 200. In addition, the antenna 110 transmits a radio signal to be transmitted to another radio apparatus such as the radio terminal 200.
  • the access point 100 transmits and receives data and the like with the wireless terminal 200 via the WiFi interface 106 and the antenna 110.
  • FIG. 3 is a diagram illustrating a configuration example of the wireless terminal 200.
  • the wireless terminal 200 includes a CPU 202, a memory 204, a WiFi interface 206, and a user interface 208.
  • the CPU 202 controls the wireless terminal 200 and performs a predetermined calculation.
  • the CPU 202 processes transmission / reception data with the foot communication device.
  • the CPU 202 is an example of a control unit.
  • the CPU 202 creates a response (application information) to the application request.
  • the memory 204 stores a program executed by the CPU 202, data used by the CPU 202, and the like.
  • the memory 204 stores data to be transmitted, received data, a schedule, and the like.
  • the WiFi interface 206 is an interface for wireless connection with other wireless devices such as the access point 100.
  • the WiFi interface 206 is an example of a wireless communication unit.
  • the user interface 208 is an interface for exchanging information with the user of the wireless terminal 200.
  • the user interface 208 includes an input device and an output device.
  • the antenna 210 receives a wireless signal transmitted from another wireless device or the like such as the access point 100. In addition, the antenna 210 transmits a radio signal to be transmitted to other wireless devices such as the access point 100.
  • the wireless terminal 200 transmits / receives data and the like to / from the access point 100 via the WiFi interface 206 and the antenna 210.
  • the access point 100 and the wireless terminal 200 can be realized by using a general-purpose computer such as a personal computer (PC: Personal Computer) or a dedicated computer such as a server machine.
  • the wireless terminal 200 can be realized using a dedicated or general-purpose computer such as a smartphone, a mobile phone, or a car navigation device, or an electronic device equipped with a computer.
  • the computer that is, the information processing apparatus includes a processor, a main storage device, and an interface device with peripheral devices such as a secondary storage device and a communication interface device.
  • the main storage device and the secondary storage device are computer-readable recording media.
  • the processor loads a program stored in the recording medium into the work area of the main storage device and executes the program, and the peripheral device is controlled through the execution of the program, thereby realizing a function meeting a predetermined purpose. Can do.
  • the processor is, for example, a CPU (Central Processing Unit) or a DSP (Digital Signal Processor).
  • the main storage device includes, for example, a RAM (Random Access Memory) and a ROM (Read Only Memory).
  • the secondary storage device is, for example, an EPROM (Erasable Programmable ROM) or a hard disk drive (HDD, Hard Disk Drive).
  • the secondary storage device can include a removable medium, that is, a portable recording medium.
  • the removable medium is, for example, a USB (Universal Serial Bus) memory or a disc recording medium such as a CD (Compact Disc) or a DVD (Digital Versatile Disc).
  • the communication interface device is, for example, a LAN (Local Area Network) interface board or a wireless communication circuit for wireless communication.
  • LAN Local Area Network
  • Peripheral devices include input devices such as keyboards and pointing devices, output devices such as display devices and printers, in addition to the secondary storage devices and communication interface devices described above.
  • the input device may include a video / image input device such as a camera, and an audio input device such as a microphone.
  • the output device may include an audio output device such as a speaker.
  • the computer used as the access point 100 implements functions such as data transmission / reception and schedule creation by the processor loading and executing a program stored in the secondary storage device into the main storage device.
  • the memory 104 is provided in a storage area of the main storage device or the secondary storage device.
  • the computer used as the wireless terminal 200 implements functions such as data transmission / reception and telephone by the processor loading and executing the program stored in the secondary storage device into the main storage device.
  • the memory 204 is provided in a storage area of the main storage device or the secondary storage device.
  • FIG. 4 is diagrams illustrating an example of an operation sequence according to the present embodiment.
  • “A”, “B”, and “C” in FIG. 4 are connected to “A”, “B”, and “C” in FIG. 5, respectively.
  • “1” in FIG. 4 is connected to “1” in FIG.
  • “D”, “E”, and “F” in FIG. 5 are connected to “D”, “E”, and “F” in FIG. 6, respectively.
  • “2” in FIG. 5 is connected to “2” in FIG.
  • connection between the access point 100 and the wireless terminal 200A and the connection between the access point 100 and the wireless terminal 200B are completed by executing a communication procedure known in IEEE 802.11 or the like.
  • the access point 100 can acquire an identifier for identifying the wireless terminal 200A and the wireless terminal 200B that are wirelessly connected.
  • uplink is a direction from the wireless terminal 200 toward the access point 100.
  • Downlink is a direction from the access point 100 toward the wireless terminal 200.
  • the access point 100 transmits beacon information and basic information to all wireless terminals 200 (here, the wireless terminal 200A and the wireless terminal 200B) wirelessly connected to the access point 100 itself (SQ1001). From here, the basic period (P0) is started.
  • the beacon information is information on the access point 100 notified to the wireless terminal 200.
  • the beacon information includes identification information of the access point 100 and the like.
  • FIG. 7 is a diagram showing an example of basic information.
  • the basic information includes information such as protocol ID, length of one cycle (length of one basic cycle), number of users, broadcast program, and the like.
  • the protocol ID is identification information indicating a communication method according to the present embodiment.
  • the identification information is “VDFX”.
  • the wireless terminal 200 receives the basic information including the protocol ID, and recognizes that communication with the access point 100 is performed by the communication method according to the present embodiment.
  • the length of the basic period is 100 ms.
  • the length of the basic period is not limited to 100 ms.
  • the number of users is the number of wireless terminals 200 connected to the access point 100.
  • the broadcast program is, for example, a program table of a broadcast program using audio data and video data transmitted as multicast data.
  • the user of the wireless terminal 200 can select a broadcast program to view based on the program guide.
  • the access point 100 transmits an application request to the wireless terminal 200A that is the first wireless terminal (SQ1002).
  • the application request is a signal for requesting the wireless terminal 200 to notify the access point 100 of the data size and data class that the wireless terminal 200 intends to transmit to the access point 100.
  • Data classes include, for example, H type and BE type.
  • the H (High) type indicates data with high priority.
  • the BE (Best Effort) type indicates data with low priority.
  • Data with high priority is, for example, data that requires real-time performance.
  • the data with high priority includes, for example, IP phone data.
  • information about data scheduled to be transmitted in the basic cycle (P0) is requested.
  • Data with high priority is also referred to as priority data.
  • Data with low priority is also referred to as best effort data. Best effort data is an example of non-priority data.
  • the wireless terminal 200A When the wireless terminal 200A receives an application request addressed to the wireless terminal 200A from the access point 100, the wireless terminal 200A creates a data size and a data class that the wireless terminal 200A itself intends to transmit as application information (response). Transmit (SQ1003). If the wireless terminal 200A does not have data to be transmitted, the wireless terminal 200A transmits to the access point 100 as application information that there is no data to be transmitted.
  • the application information may include information other than the data size and the data class.
  • the access point 100 When the access point 100 receives the application information from the wireless terminal 200A, the access point 100 stores information (data size, data class) included in the application information in the memory 104.
  • the access point 100 transmits a confirmation response (Ack: Acknowledgement) to the application information to the wireless terminal 200A (SQ1004).
  • the access point 100 transmits an application request to the radio terminal 200B that is the second radio terminal (SQ1005).
  • the access point 100 may collectively transmit the confirmation response to the wireless terminal 200A and the application request to the wireless terminal 200B. Sending all together saves time compared to sending separately.
  • the wireless terminal 200B When receiving the application request from the access point 100, the wireless terminal 200B creates the data size and data class that the wireless terminal 200B intends to transmit as application information and transmits it to the access point 100 (SQ1006). If the wireless terminal 200B does not have data to transmit, the wireless terminal 200B transmits to the access point 100 as application information that there is no data to be transmitted.
  • the access point 100 When the access point 100 receives the application information from the wireless terminal 200B, the access point 100 stores the information (data size, data class) included in the application information in the memory 104. Further, the access point 100 transmits a confirmation response (Ack) to the application information to the radio terminal 200A (SQ1007).
  • Ack confirmation response
  • the access point 100 determines that the wireless terminal 200 does not have data to transmit.
  • the access point 100 creates a schedule based on the application information received from each wireless terminal 200, the size of data sent from the host device to the wireless terminal 200, and the like.
  • the schedule table is created for each of upstream priority data, downstream priority data, downstream priority multicast data, upstream best effort data, downstream best effort data, and upstream multicast best effort data.
  • the downlink data schedule is created based on the data addressed to the wireless terminal 200 received from the host device via the network.
  • the schedule is a schedule for the basic period (P0).
  • the schedule is an example of schedule information.
  • FIG. 8 is a diagram showing an example of packet transmission time.
  • the transmission time at 10 Mbps, 50 Mbps, and 100 Mbps with respect to a predetermined data capacity is shown.
  • an 864-byte IP packet corresponding to 100 ms of telephone voice is transmitted at 70 ⁇ s (100 Mbps).
  • FIG. 9 is a diagram showing an example of a priority data schedule.
  • classification, direction, order, ID, and time are set.
  • the division “S0” means transmission of upstream priority data.
  • the division “S01” means transmission of downlink priority data.
  • the division “S02” means transmission of downlink priority multicast data.
  • the direction indicates up or down.
  • the ID is an identifier that identifies each wireless terminal 200.
  • the time is the start time of the time allocated to transmit predetermined data. The allocated time is determined based on the size of data to be transmitted. For example, in the case of 100 Mbps, the time allocated to the wireless terminal 200 that is scheduled to transmit 864 bytes of data is 100 ⁇ s obtained by adding the response limit time 30 ⁇ s to the data transmission time 70 ⁇ s.
  • the response time limit is a time during which the access point 100 waits for a response.
  • the response time limit may be predetermined to a predetermined value.
  • the access point 100 may perform the following processing when data or an acknowledgment is not transmitted even if the response time limit is exceeded.
  • the time allocated to the multicast data may not include the response limit time. This is because the access point 100 does not request an acknowledgment for multicast data.
  • FIG. 10 is a diagram showing an example of a schedule of best effort data.
  • the classification, direction, order, ID, and time are set as in the schedule table of priority data.
  • the division “S1” means transmission of uplink best effort data.
  • the division “S11” means transmission of downlink best effort data.
  • the division “S12” means transmission of downlink best effort multicast data.
  • the access point 100 creates the schedule so as to be within 100 ms of the basic period (P0). If there is a lot of data to be transmitted and all the data does not fit within the basic period (P0), some of the best effort data is not included in the schedule. The best effort data not included in the schedule may be determined in any way.
  • the access point 100 transmits all the created schedules and the S0 start command to all the wireless terminals 200 (SQ1008). From here, transmission / reception of priority data between the access point 100 and the wireless terminal 200 is started.
  • the S0 start command is a signal notifying the wireless terminal 200 that the classification “S0” is started.
  • the access point 100 transmits a confirmation request signal to the wireless terminal 200A as the first wireless terminal according to the schedule (SQ1009).
  • the confirmation request signal is a signal that requests the wireless terminal 200 to transmit to the access point 100 the priority data that the wireless terminal 200 intends to transmit to the access point 100.
  • the confirmation request signal to the radio terminal 200A as the first radio terminal may be transmitted together with the S0 start command of the sequence SQ1008.
  • the wireless terminal 200A When receiving the confirmation request signal addressed to the wireless terminal 200A from the access point 100, the wireless terminal 200A transmits the priority data notified to the access point 100 by the application request to the access point 100 (SQ1010).
  • the access point 100 When the access point 100 receives the priority data from the radio terminal 200A, the access point 100 transmits an acknowledgment to the radio terminal 200A (SQ1011). Further, the access point 100 transmits a confirmation request signal to the wireless terminal 200B that is the second wireless terminal according to the schedule (SQ1012). The access point 100 may collectively transmit a confirmation response to the wireless terminal 200A and a confirmation request signal to the wireless terminal 200B. Sending all together saves time compared to sending separately. Further, the access point 100 transmits the priority data to the destination of the priority data via the network.
  • the wireless terminal 200A When the wireless terminal 200A does not receive the confirmation response to the transmission of the priority data, when the next application request is received, the wireless terminal 200A notifies the transmission of the priority data again and tries to transmit the priority data. Also good.
  • the wireless terminal 200B When the wireless terminal 200B receives the confirmation request signal addressed to the wireless terminal 200B from the access point 100, the wireless terminal 200B transmits the priority data notified to the access point 100 by the application request to the access point 100 (SQ1013).
  • the access point 100 When the access point 100 receives the priority data from the radio terminal 200B, the access point 100 transmits an acknowledgment to the radio terminal 200A (SQ1014).
  • the access point 100 may perform the following process when data or an acknowledgment is not transmitted even after the response time limit is exceeded. In this case, the access point 100 may update the schedule. For example, when the schedule is advanced because no data or the like is transmitted, the access point 100 can incorporate the transmission / reception of the best effort data that was not included in the schedule when creating the schedule into the schedule. The access point 100 transmits the updated schedule to the wireless terminal 200 together with the start command, for example.
  • the access point 100 does not transmit a confirmation request signal for requesting transmission of priority data to the wireless terminal 200 that does not have priority data to be transmitted.
  • the access point 100 transmits S01 and S02 start command to all the wireless terminals 200 (SQ1015).
  • the S01 and S02 start command is a signal that notifies the wireless terminal 200 that the sections “S01” and “S02” are started.
  • the access point 100 transmits downlink priority data addressed to the radio terminal 200A to the radio terminal 200A that is the first radio terminal according to the schedule (SQ1016).
  • the wireless terminal 200A When receiving the downlink priority data addressed to the wireless terminal 200A from the access point 100, the wireless terminal 200A transmits an acknowledgment to the access point 100 (SQ1017).
  • the access point 100 When the access point 100 receives the confirmation response from the radio terminal 200A, the access point 100 transmits downlink priority data addressed to the radio terminal 200B to the radio terminal 200B according to the schedule (SQ1018).
  • the wireless terminal 200B When receiving the downlink priority data addressed to the wireless terminal 200B from the access point 100, the wireless terminal 200B transmits an acknowledgment to the access point 100 (SQ1019).
  • the wireless terminal 200 that has received the downlink priority data stores the received data in the memory 204 and performs predetermined processing on the received data.
  • the access point 100 may transmit the next downlink priority data according to the schedule even when the confirmation response is not received even after a predetermined time has elapsed since the downlink priority data was transmitted.
  • the access point 100 transmits the downlink priority multicast data to all the radio terminals 200 according to the schedule (SQ1020).
  • the downlink priority multicast data is multicast data having a high priority.
  • the access point 100 transmits an S1 start command to all the wireless terminals 200 (SQ1021). From here, transmission / reception of the best effort data is started between the access point 100 and the wireless terminal 200.
  • the S1 start command is a signal notifying the wireless terminal 200 that the division “S1” is started.
  • the access point 100 transmits a confirmation request signal to the wireless terminal 200A as the first wireless terminal according to the schedule (SQ1022).
  • the confirmation request signal is a signal for requesting the wireless terminal 200 to transmit to the access point 100 the best effort data that the wireless terminal 200 intends to transmit to the access point 100.
  • the confirmation request signal to the radio terminal 200A as the first radio terminal may be transmitted together with the S1 start command of the sequence SQ1021.
  • the wireless terminal 200A When receiving the confirmation request signal addressed to the wireless terminal 200A from the access point 100, the wireless terminal 200A transmits the best effort data notified to the access point 100 by the application request to the access point 100 (SQ1023).
  • the access point 100 When the access point 100 receives the best effort data from the radio terminal 200A, the access point 100 transmits an acknowledgment to the radio terminal 200A (SQ1024). Further, the access point 100 transmits a confirmation request signal to the wireless terminal 200B as the second wireless terminal according to the schedule (SQ1025). The access point 100 may collectively transmit a confirmation response to the wireless terminal 200A and a confirmation request signal to the wireless terminal 200B. Sending all together saves time compared to sending separately. Further, the access point 100 transmits the priority data via the network with the received best effort data directed to the destination of the best effort data.
  • the wireless terminal 200A may notify the transmission of the best effort data again when the next application request is received.
  • the wireless terminal 200B When receiving the confirmation request signal addressed to the wireless terminal 200B from the access point 100, the wireless terminal 200B transmits the best effort data notified to the access point 100 by the application request to the access point 100 (SQ1026).
  • the access point 100 When the access point 100 receives the best effort data from the radio terminal 200B, the access point 100 transmits an acknowledgment to the radio terminal 200A (SQ1027).
  • the access point 100 does not transmit a confirmation request signal for requesting transmission of best effort data to the wireless terminal 200 that does not have the best effort data to be transmitted.
  • the access point 100 transmits S11 and S12 start command to all the wireless terminals 200 (SQ1028).
  • the S11 and S12 start command is a signal that notifies the wireless terminal 200 that the sections “S11” and “S12” are started.
  • the access point 100 transmits the downlink best effort data addressed to the radio terminal 200A to the radio terminal 200A as the first radio terminal according to the schedule (SQ1029).
  • the wireless terminal 200A When receiving the downlink best effort data addressed to the wireless terminal 200A from the access point 100, the wireless terminal 200A transmits an acknowledgment to the access point 100 (SQ1030).
  • the access point 100 When the access point 100 receives the confirmation response from the radio terminal 200A, the access point 100 transmits the downlink best effort data addressed to the radio terminal 200B to the radio terminal 200B according to the schedule (SQ1031).
  • the wireless terminal 200B When receiving the downlink best effort data addressed to the wireless terminal 200B from the access point 100, the wireless terminal 200B transmits an acknowledgment to the access point 100 (SQ1032).
  • the wireless terminal 200 that has received the downlink priority data stores the received data in the memory 204 and performs predetermined processing on the received data.
  • the access point 100 transmits the downlink best effort multicast data to all the radio terminals 200 according to the schedule (SQ1033).
  • the downlink best effort multicast data is multicast data having a low priority. Data with low priority is, for example, data that does not require real-time performance.
  • the basic period (P0) started in the sequence SQ1001 ends.
  • the access point 100 transmits beacon information and basic information to the radio terminal 200, whereby the next basic period (P1) is started (SQ1034).
  • the schedule generated by the access point 100 may be updated at any time. That is, when there is no response for a predetermined time from the radio terminal 200 to which the uplink transmission time is assigned based on the application information, the confirmation request signal may be sent to the next radio terminal 200 by moving up the schedule. In addition, when the schedule is changed, the updated schedule may be transmitted from the access point 100 to the wireless terminal 200 at the timing of transmitting each start command.
  • the wireless terminal 200 transmits uplink data.
  • the access point 100 may transmit uplink data according to the schedule received by the wireless terminal 200 from the access point 100 without transmitting the confirmation request signal. In this case, since the access point 100 does not transmit the confirmation request signal, the band use efficiency is improved.
  • Audio data is generated by codec processing.
  • the wireless terminal 200 makes a call using a telephone such as an IP phone via the network via the access point 100 and the host device.
  • audio data generated by codec processing by the wireless terminal 200 used as a telephone is transmitted to the host device via the access point 100.
  • the codec process is performed after the audio sample time has elapsed.
  • the audio data is transmitted to the access point 100 after the codec processing.
  • Voice data in a telephone is transmitted as data with high priority because real-time performance is required.
  • the time required for codec processing is codec time.
  • the delay time in the telephone includes at least a voice sample time, a codec time, a time until the voice data is transmitted after the codec processing, and a music data transmission time. In the telephone, it is required to shorten the delay time. If the time from the codec processing to the transmission of audio data is long, the delay time becomes long. If radio terminal 200 transmits audio data once in one basic period, the length of the audio sample period may be adjusted to the length of the basic period. By adjusting the length of the voice sample period to the length of the basic period, the delay time becomes substantially constant. If the length of the audio sample period is different from the length of the basic period, the time from the codec processing to the transmission of the audio data varies, and the delay time varies. That is, if the delay time fluctuates, the telephone quality may be degraded.
  • FIG. 11 is a diagram illustrating an example of a voice sample period, codec time, and voice data transmission time at an access point in a wireless terminal.
  • codec processing is started after an audio sample period has elapsed, and audio data is transmitted to access point 100 after completion of codec processing.
  • the audio data is transmitted based on the schedule of uplink priority data.
  • the wireless terminal 200 When receiving an application request from the access point 100, the wireless terminal 200 notifies that priority data (voice data) is scheduled to be transmitted in the application information.
  • the radio terminal 200 can shorten the delay time by adjusting the phase of the audio sample period so that the end time of the codec processing is immediately before the audio data transmission time. For example, the radio terminal 200 can shorten the delay time by adjusting the phase of the audio sample period so that the end time of the codec processing becomes the start time of the basic period. That is, the wireless terminal 200 sets a time obtained by subtracting the codec time and the voice sample period from the start time of the basic period as the start time of the voice sample period.
  • FIG. 12 is a diagram illustrating an example of the relationship between the basic period and the priority data.
  • transmission / reception of priority data is performed once at time ⁇ T within one basic period. That is, transmission / reception of uplink priority data, downlink priority data, and downlink priority multicast data is performed between the access point 100 and the wireless terminal 200 at time ⁇ T.
  • the application for upstream priority data is made at the beginning of the basic cycle. Therefore, the radio terminal 200 transmits the uplink priority data after waiting for a time ⁇ T at the maximum after transmitting the application information regarding the uplink priority data. If the waiting time until the priority data is transmitted becomes longer, for example, the quality of a service (such as a telephone) that uses the priority data decreases. Therefore, it is desirable that the waiting time until the priority data is transmitted is shorter. In the first modification, the time for transmitting and receiving priority data is divided into a plurality of times.
  • FIG. 13 is a diagram showing an example of the relationship between the basic period and the priority data in the first modification.
  • transmission / reception of priority data is performed twice at time ⁇ T / 2 within one basic period.
  • the access point 100 transmits an application request to all the wireless terminals 200 at the beginning of transmission / reception of each priority data.
  • the standby time of the priority data is a maximum time ⁇ T / 2, and the standby time is reduced as compared with the example of FIG.
  • priority data transmission / reception is divided into two, assuming that the basic period is 100 ms, priority data transmission / reception is started at intervals of 50 ms.
  • the transmission / reception of the best effort data is assigned at a time when the transmission / reception of the priority data is not performed.
  • the transmission time of the priority data is divided into two times within the basic period, but may be divided into two or more times.
  • Information on the number of divisions of the transmission time of the priority data may be included in the basic information and notified from the access point 100 to the wireless terminal 200, for example.
  • FIG. 14 is a diagram illustrating an example of a voice sample period, a codec time, and a voice data transmission time at an access point in the wireless terminal in the first modification.
  • the upper diagram in FIG. 14 is similar to that shown in FIG. 11 and is a comparative example.
  • the upper diagram in FIG. 14 shows the relationship among the voice sample period, codec time, and voice data transmission time when priority data transmission / reception time is assigned as shown in FIG.
  • the lower diagram of FIG. 14 shows the relationship between the voice sample period, the codec time, and the voice data transmission time when priority data transmission / reception time is assigned as shown in FIG. If the telephone delay time in the upper diagram of FIG. 14 is D, in the lower diagram of FIG. 14, the telephone delay time is approximately D / 2. That is, by dividing the transmission / reception of priority data into two times within one basic period, the delay time of the telephone can be almost halved.
  • Modification 2 In the second modification, the wireless terminal 200 connected to the access point 100 is divided into a plurality of groups, and the size of the priority data in the basic period is reduced, thereby reducing the waiting time.
  • FIG. 15 is a diagram illustrating an example of the relationship between the basic period and the priority data in the second modification.
  • the wireless terminal 200 is divided into a group A and a group B.
  • Each wireless terminal 200 belongs to group A or group B. Whether each wireless terminal 200 belongs to group A or group B may be determined in any way.
  • Half of the wireless terminals 200 belong to group A, and half of the wireless terminals 200 belong to group B.
  • the access point 100 shifts the phase of the basic period of group A and the phase of the basic period of group B by a half period (1/2 period).
  • the access point 100 causes the start time of the basic period (Pa1) of group A and the start time of the basic period (Pb1) of group B to be shifted by a half time of the basic period.
  • the access point 100 divides the wireless terminal 200 into two groups, but it may be divided into three or more groups.
  • the access point 100 shifts the start time of the basic period of each group by 1 / n time of the basic period.
  • the group to which the wireless terminal 200 belongs is notified from the access point 100 to each wireless terminal 200 by basic information, for example.
  • the transmission / reception time of the priority data in each basic cycle is approximately 1 ⁇ 2 of the transmission / reception time of the priority data in the example of FIG.
  • the schedule a schedule for group A and a schedule for group B are created.
  • the wireless terminal 200 When the wireless terminal 200 is divided into a plurality of groups, the priority data transmission / reception time in one basic period is reduced, and the standby time for priority data transmission is reduced.
  • the access point 100 transmits an application request to all wireless terminals 200 that are wirelessly connected.
  • the wireless terminal 200 that has received the application request notifies the access point of information (application information) of data scheduled to be transmitted.
  • the access point 100 creates a schedule for one basic period based on the application information received from the wireless terminal 200, the data addressed to the wireless terminal 200 from the host device, and the like.
  • the access point 100 creates a schedule for priority data and a schedule for best effort data.
  • the access point 100 transmits the schedule to the wireless terminal 200.
  • the access point 100 and the wireless terminal 200 transmit and receive priority data and best effort data based on the schedule.
  • the bandwidth usage efficiency between the access point 100 and the wireless terminal 200 is improved by grasping the data transmitted / received between the access point 100 and the wireless terminal 200 and creating a schedule.
  • the vertical band ratio is fixed or semi-fixed.
  • the upper / lower bandwidth ratio is not fixed, and the access point 100 can dynamically change the upper / lower bandwidth ratio according to the data amount, so that the bandwidth usage efficiency is improved.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un appareil de relais radio, auquel sont radio-connectés un ou plusieurs terminaux radio, qui comprend : une unité de communication radio qui transmet, aux terminaux radio, une requête d'application afin de demander aux terminaux radio de notifier l'appareil de relais radio des tailles de données à transmettre à des intervalles prédéfinis et des niveaux de priorité des données et qui reçoit, des terminaux radio, des réponses respectives à la requête d'application; et une unité de commande, qui génère, sur la base des tailles et des niveaux de priorité des données incluses dans la réponse, des informations de planification afin d'attribuer des heures pour transmettre les données aux intervalles. L'unité de commande commande l'unité de communication radio, afin de transmettre les informations de planification aux terminaux radio et commande l'émission-réception de données de/vers les terminaux radio, sur la base des informations de planification.
PCT/JP2013/063976 2013-05-20 2013-05-20 Appareil et procédé de relais radio et terminal radio WO2014188499A1 (fr)

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WO2020258301A1 (fr) * 2019-06-28 2020-12-30 华为技术有限公司 Procédé et appareil de communication

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WO2008050467A1 (fr) * 2006-10-27 2008-05-02 Mitsubishi Electric Corporation Procédé de communication de données, système de communication et terminal mobile
JP2009152880A (ja) * 2007-12-20 2009-07-09 Nippon Telegr & Teleph Corp <Ntt> 無線通信方法及び無線通信システム
JP2011101314A (ja) * 2009-11-09 2011-05-19 Hitachi Kokusai Electric Inc 無線通信システム
JP2011135577A (ja) * 2009-12-23 2011-07-07 Intel Corp グループリソース割り当てシステム及び技術
WO2011112741A1 (fr) * 2010-03-09 2011-09-15 Qualcomm Incorporated Communication montante multiutilisateur utilisant un système edca avec interrogation

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Publication number Priority date Publication date Assignee Title
WO2008050467A1 (fr) * 2006-10-27 2008-05-02 Mitsubishi Electric Corporation Procédé de communication de données, système de communication et terminal mobile
JP2009152880A (ja) * 2007-12-20 2009-07-09 Nippon Telegr & Teleph Corp <Ntt> 無線通信方法及び無線通信システム
JP2011101314A (ja) * 2009-11-09 2011-05-19 Hitachi Kokusai Electric Inc 無線通信システム
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WO2011112741A1 (fr) * 2010-03-09 2011-09-15 Qualcomm Incorporated Communication montante multiutilisateur utilisant un système edca avec interrogation

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