WO2009107180A1 - Communication terminal device and reception method - Google Patents

Communication terminal device and reception method Download PDF

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Publication number
WO2009107180A1
WO2009107180A1 PCT/JP2008/003727 JP2008003727W WO2009107180A1 WO 2009107180 A1 WO2009107180 A1 WO 2009107180A1 JP 2008003727 W JP2008003727 W JP 2008003727W WO 2009107180 A1 WO2009107180 A1 WO 2009107180A1
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WO
WIPO (PCT)
Prior art keywords
mode
timer
reception
received data
communication terminal
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PCT/JP2008/003727
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French (fr)
Japanese (ja)
Inventor
庸介 中塚
星 吉行
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パナソニック株式会社
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Publication of WO2009107180A1 publication Critical patent/WO2009107180A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0209Power saving arrangements in terminal devices
    • H04W52/0225Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • H04W52/0232Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal according to average transmission signal activity
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a communication terminal apparatus and a receiving method that operate in a power save mode, and more particularly, to a communication terminal apparatus in a wireless LAN (WLAN: Wireless Local Area Network) system to which a power save function for reducing power consumption is applied, and the same It relates to the receiving method.
  • WLAN Wireless Local Area Network
  • wireless LAN As a representative technique of wireless LAN, there is a method standardized by the IEEE (Institute of Electrical and Electronics Electronics) 802 Committee. Examples of the system standardized by the IEEE 802 committee include the IEEE 802.11 standard system, the IEEE 802.11a standard system, the IEEE 802.11b standard system, and the IEEE 802.11g standard system. Further, Bluetooth (registered trademark) is a wireless communication protocol defined by IEEE 802.15.1.
  • the communication standard related to wireless LAN-compatible communication terminals defines a power save mode (PS mode) in which the reception of packets addressed to the device from the access point is periodically stopped to intermittently become a nap and save power.
  • PS mode power save mode
  • the power consumption of the wireless LAN unit is large, so if it is always turned on, the battery of the portable device will be consumed in a short time. Therefore, the reception of packets addressed to itself from the access point is periodically performed, and at least a part of the wireless communication unit (A / D converter may be included) that consumes much power during the packet reception stop period. Turn off the power supply to reduce power consumption.
  • the IEEE802.11 wireless LAN has a power management function for suppressing the battery consumption of the terminal.
  • a method for changing the power management mode and a terminal station that is in the power saving state are AP ( A method for sending and receiving data to / from Access Point is defined.
  • the terminal (station) operation mode related to power management includes active mode and power save mode.
  • the active mode the terminal station is in an awake state in which transmission / reception is possible at all times, and in the power save mode, the awake state and the doze state that operates with a minimum power that cannot be transmitted / received are intermittently changed to operate in the power save mode.
  • a terminal that can send and receive a frame can only send and receive frames when in the Awake state.
  • the terminal operating in the power save mode performs a reception operation by shifting from the Doze state to the Awake state in accordance with the timing of the beacon transmitted from the base device.
  • the terminal notifies the AP of the change of the operation mode when the operation mode transitions between the power save mode and the active mode.
  • the power management bit in the frame control field of the frame transmitted by the terminal station is used to notify the AP.
  • the AP When the AP is notified of the operation in the power save mode, the AP temporarily buffers the data addressed to the terminal station operating in the power save mode, and the packet is buffered by the traffic indication map (TIM: Traffic Indication Map) in the Beacon. To be informed. Data destined for terminal stations operating in active mode is not buffered.
  • TIM Traffic Indication Map
  • the reception operation in the power save mode of the terminal station is performed by shifting from the Doze state to the Awake state in accordance with the Beacon timing from the AP. Whether or not the data addressed to the terminal station is accumulated from the AP is notified by the TIM information element, and when there is data addressed to the local station, the data is transmitted from the AP by transmitting a control frame called PS-Poll. Pull out. The presence / absence of data accumulated in the AP can be confirmed in the frame control field, and as soon as it is gone, it is possible to transition to the Doze state.
  • the legacy power save that performs the reception operation as described above since the same number of control frames need to be transmitted with respect to the received data, the data reception is considered in consideration of the transmission current and the bandwidth for transmitting the control frame. Depending on the amount, there are situations where reception in the active mode can be received more efficiently.
  • the active mode it is possible to efficiently transmit and receive as described above, but power consumption is not suppressed. Therefore, when the mobile station maintains the standby state in the active mode, the power consumption is not suppressed, so it is necessary to switch to the power save mode to save the power consumption.
  • transitioning to the active mode it is necessary to return to the power save mode in terms of power consumption, and it is necessary to set the timing. In active mode, the presence or absence of data is not notified, so it is not known when to shift to active mode.
  • FIGS. 1A and 1B are diagrams for explaining an example of a data transmission / reception process in each reception mode.
  • FIG. 1A shows a reception sequence in the power save mode
  • FIG. 1B shows a reception sequence in the active mode.
  • FIG. 1A shows a case where transmission / reception is performed in the power save mode.
  • the power save mode shifts to the power save mode by the timer operation in the active mode.
  • the terminal station changes from the Doze state to the Awake state at the Beacon reception timing, and receives the Beacon. If buffer data exists, PS-Poll is transmitted and data is received until the MoreData flag becomes 0. When the MoreData flag becomes 0, the state transitions to the Doze state to suppress power consumption.
  • FIG. 1B shows a case where transmission / reception is performed in an active mode.
  • the Doze state is changed to the Awake state, and the Beacon is received.
  • a notification packet for canceling the power save is transmitted to the AP for reception in the active mode.
  • a timer is started each time a reception confirmation response (ACK) of each data is transmitted, and when data is not received for a certain period of time, a power save transition notification packet is transmitted to enter the Doze state.
  • ACK reception confirmation response
  • this timer is given as fixed, and there is a problem that efficient switching is not necessarily performed.
  • Patent Document 1 describes a wireless communication method that saves power by sequentially switching between an active mode and a power save mode in a WLAN. According to the wireless communication method described in Patent Document 1, packet loss due to packet delay or buffer overflow when the terminal station operates in the power save mode is reduced, and a drop in throughput due to control frame transmission is prevented. Electricity can be realized. JP 2007-19607 A
  • the timer is not always optimally set.
  • FIG. 2A and 2B are diagrams for explaining an example of a data transmission / reception process using a timer value.
  • FIG. 2A shows a reception sequence when the timer is short
  • FIG. 2B shows a reception sequence when the timer is long.
  • An object of the present invention is to provide a communication terminal device and a receiving method capable of optimizing switching between an active mode and a power save mode to achieve optimum reception and power saving.
  • the communication terminal apparatus of the present invention is a communication terminal apparatus having an active mode and a power save mode based on a polling process by PS-Poll, monitoring received traffic, and maintaining a packet interval of received data and the number of received data Receiving traffic monitoring means, a control means for setting a timer value of a timer that transitions from the Awake state in the active mode to the power save mode and transitions to the Doze state based on the held packet interval of the received data, and in each mode A configuration is adopted that includes a reception interval, the number of received data, and a reception mode determining means for switching modes based on the time of the timer in the active mode.
  • the reception method of the present invention is a reception method of a communication terminal apparatus having an active mode and a power save mode based on a polling process by PS-Poll, which monitors received traffic, and is a packet interval of received data and the number of received data
  • a selection step of switching modes based on the reception interval and the number of received data and the timing of the timer in the active mode.
  • the timer for shifting from the Awake state at the time of reception in the active mode to the Doze state of the power save mode is appropriately and appropriately set.
  • a reduction in throughput due to the shortening of the timer and a reduction in power consumption due to the continuous acquisition of data transmitted from the network due to the extension of the timer can be suppressed.
  • optimal reception can be performed by switching the reception mode so that the device awake state is minimized by the number of received packets and the timer value.
  • the reception data interval in each reception mode is maintained, the reception mode is selected so as to minimize the awake time according to the number of reception data and the timer time, and switching at the timing of each beacon makes it possible to change the energy at the time of reception. Consumption can be optimized.
  • the block diagram which shows the structure of the communication terminal device which concerns on embodiment of this invention The flowchart which shows the operation
  • movement which sets the timer value of the timer determination part of the communication terminal device which concerns on this Embodiment The flowchart which shows the receiving method selection by the notification of the application part of the communication terminal device which concerns on this Embodiment
  • FIG. 3 is a block diagram showing a configuration of a communication terminal apparatus according to an embodiment of the present invention. This embodiment is an example applied to a wireless terminal station of a WLAN-equipped terminal.
  • the wireless communication system includes a communication terminal device, an access point AP, and a network.
  • a communication terminal device 100 is a portable terminal device such as a PHS (Personal Handy-Phone System) / cell phone, PDA (Personal Digital Assistant) having a wireless LAN function, and performs wireless communication by connecting to an AP.
  • Communication terminal apparatus 100 has an active mode and a power save mode based on a polling process by PS-Poll.
  • the communication terminal device 100 receives a beacon from an AP existing in the vicinity, and acquires the AP network name, the communication speed of the communication device, the security strength, the communication channel, and the radio wave strength.
  • the communication terminal device 100 includes an antenna 101, a wireless communication unit 102, a power supply control unit 103, a traffic monitoring unit 104, a timer determination unit 105, a timer control unit 106, a MAC (Medium Access Control) medium control unit 107, and a memory 108.
  • a reception mode determination unit 109 and an application unit 110 are included in the communication terminal device 100.
  • the antenna 101 transmits a transmission signal input from the wireless communication unit 102 while the communication terminal apparatus 100 outputs a reception signal to the wireless communication unit 102.
  • the wireless communication unit 102 performs processing for wirelessly transmitting data input from the MAC control unit 107. In addition, the wireless communication unit 102 performs processing for outputting the received data to the MAC control unit 107 and the traffic monitoring unit 104.
  • the power supply control unit 103 turns on and off the circuit of the wireless communication unit 102.
  • the power control unit 103 controls the power supply of the wireless communication unit 102 in accordance with the power on / off request from the MAC control unit 107.
  • the traffic monitoring unit 104 monitors the packet quality of received data input from the wireless communication unit 102, the number of received data, the line quality such as RSSI (Received Signal Strength Indicator) and transmission speed, and the result is sent from the MAC control unit 107. When a notification of traffic end is received, it is written in the memory 108. In addition, the traffic monitoring unit 104 requests the timer determination unit 105 to reset the timer when quality improvement and deterioration are detected in the line quality monitoring.
  • RSSI Receiveived Signal Strength Indicator
  • the timer determination unit 105 Upon receiving a timer determination request from the traffic monitoring unit 104, the timer determination unit 105 determines a timer value with reference to the active mode reception interval 111 and the line quality 114 of the memory 108, and sends the value to the timer control unit 106. At the same time, it is stored in the timer value 115 of the memory 108.
  • the timer determination unit 105 has a function as a control unit that sets a timer value of a timer that shifts from the active mode Awake state to the power save mode and transitions to the Doze state based on the held packet interval of the received data. For example, when the received traffic monitoring unit 104 monitors the received packet interval and there is no traffic for a certain period of time, the timer determining unit 105 sets a timer time for transition to the Doze state.
  • the timer control unit 106 has a timer for measuring the time from the Awake state in the active mode to the power save mode and transitioning to the Doze state, and counts the timer based on the control of the MAC control unit 107.
  • the timer control unit 106 counts up to the timer time notified by the timer determination unit 105, the timer control unit 106 notifies the MAC control unit 107 of a timeout.
  • the MAC control unit 107 performs control for passing and transmitting data input from the application unit 110 to the wireless communication unit 102, and performs control for passing data received by the wireless communication unit 102 to the application unit 110.
  • the MAC control unit 107 is characterized by performing the following mode switching control in addition to the basic function of access control in the wireless section.
  • the MAC control unit 107 controls the power supply control unit 103 based on the reception mode notified from the reception mode determination unit 109. That is, when receiving in the power save mode, when there is a notification that there is data addressed to the own station from the received data input from the wireless communication unit 102, control is performed to transmit PS-Poll from the wireless communication unit 102, When receiving a notification that there is no data addressed to the own station, the power supply control unit 103 is requested to turn off the wireless communication unit 102. When receiving in the active mode with a timer function, upon receiving a notification that there is data addressed to the own station, the power supply control unit 103 is requested to turn on the power to the wireless communication unit 102 and the wireless communication unit 102 is notified of the release of power saving.
  • the wireless communication unit 102 transmits a packet notifying the transition to the power save mode and requests the power supply control unit 103 to turn off the wireless communication unit 102. Further, the traffic monitoring unit 104 is notified of the traffic end.
  • the power control unit 103 is requested to turn on the wireless communication unit 102.
  • the MAC control unit 107 controls the start and stop of the timer control unit 106 according to the reception mode notified by the reception mode determination unit 109.
  • the timer control unit 106 is requested to clear the timer count.
  • the MAC control unit 107 transmits a reception mode determination request to the reception mode determination unit 109 periodically such as a DTIM (Delivery Traffic Indication Message) interval.
  • a DTIM Delivery Traffic Indication Message
  • the memory 108 holds the reception interval 111 in the active mode, the reception interval 112 in the power save mode, the number of received data 113, and the line quality 114 detected by the traffic monitoring unit 104. In addition, the memory 108 holds a timer value 115 determined by the timer determination unit 109.
  • the reception mode determination unit 109 receives the reception mode determination request from the MAC control unit 107, the reception interval 111 in the active mode, the reception interval 112 in the power save mode, the reception data number 113 and the timer written in the memory 108 With reference to value 115, a reception mode in which the power can be disconnected for a longer time is determined, and the MAC control unit 107 is notified of the reception mode.
  • the reception mode determination unit 109 selects a mode in which the awake time is shortened based on the reception interval and the number of reception data in each mode and the timer in the active mode.
  • reception mode determination section 109 selects a reception mode in which the awake state of WLANCHIP (device) is shorter from the received reception interval, number of received data, and timer in each reception mode, and the communication terminal Device 100 can receive in that mode.
  • the application unit 110 is a communication application operating in the wireless terminal station, passes data to be transmitted to the MAC control unit 107, and receives received data by the MAC control unit 107.
  • the communication terminal device 100 is connected to the AP after being activated, and enters a standby state when the application unit 110 is not operating. Due to power consumption, the default reception mode is reception in the power save mode, and normal power save operation is performed. That is, an intermittent reception operation is performed at a DTIM interval.
  • the application unit 110 When the application unit 110 operates, communication is actually started.
  • the MAC control unit 107 detects the presence of a downlink packet addressed to itself by Beacon received by the wireless communication unit 102, the communication terminal apparatus 100 performs wireless communication with PS-Poll in the power save reception mode operation.
  • a downlink packet is acquired by transmitting from the unit 102.
  • the power supply control unit 103 is controlled to turn off the wireless communication unit 102 and transition to the Doze state.
  • the MAC control unit 107 controls the power supply control unit 103 to supply power to the wireless communication unit 102 in order to receive Beacon, and transitions to the Awake state.
  • the downstream packet is monitored by the traffic monitoring unit 104, and information on the line quality such as the reception interval, the number of received data, and RSSI in each reception mode is held in the memory 108. Based on the information, the reception mode determination unit 109 selects a reception mode that saves more power and notifies the MAC control unit 107 of the reception mode.
  • the timer determination unit 105 receives a timer determination request from the traffic monitoring unit 104, the timer determination unit 105 determines a timer value by referring to information in the memory 108, passes the timer value to the timer control unit 106, and holds the timer value in the memory 108. .
  • the MAC control unit 107 passes a reception mode determination request to the reception mode determination unit 109 in accordance with the WakeUP timing.
  • the MAC control unit controls the power supply control unit 103 based on the set reception mode.
  • the timer control unit 106 is instructed by the MAC control unit 107 to start the timer when the mode is switched to the active reception mode, and is instructed to stop the timer when the mode is switched to the power save reception mode.
  • the communication terminal apparatus 100 During reception in the active mode, when the presence of a downstream packet addressed to the own station is detected by the MAC control unit 107 by the Beacon received by the wireless communication unit 102, the communication terminal apparatus 100 notifies the access point of canceling the power save. To send a packet.
  • the MAC control unit 107 requests the timer control unit 106 to clear the timer count when transmitting an ACK response to the received packet.
  • the traffic quality is changed in the traffic monitoring unit 104, for example, when a decrease in transmission speed or a decrease in RSSI is detected, a request for timer setting is issued to the timer determining unit 105, and the timer is set again. Is set.
  • the updated timer value is passed to the timer control unit 106 and the memory 108.
  • the timer control unit 106 receives a timer value timeout notification
  • the wireless communication unit 102 determines that there is no received packet held by the AP and transmits a packet for notifying the power save transition from the wireless communication unit 102.
  • the power supply control unit 103 is controlled to turn off the power of the wireless communication unit 102, and the state transitions to the Doze state.
  • the application unit 110 passes a communication end notification to the MAC control unit 107.
  • the MAC control unit 107 requests the power supply control unit 103 to power off the wireless communication unit 102.
  • FIG. 4 is a flowchart showing the operation of the communication terminal apparatus 100 when receiving the power save mode.
  • S indicates each step of the flow.
  • step S11 the MAC control unit 107 controls the power supply control unit 103 in the DTIM cycle to supply power to the wireless communication unit 102, transition to the awake state, and receive a beacon.
  • step S12 the MAC control unit 107 analyzes the Beacon information passed from the wireless communication unit 102 to confirm whether the data addressed to itself is buffered in the AP.
  • the MAC control unit 107 controls the power supply control unit 103 to turn off the power of the wireless communication unit 102 and transitions to the Doze state until the next DTIM timing.
  • the MAC control unit 107 passes PS-Poll to the wireless communication unit 102 and transmits it in step S13.
  • the wireless communication unit 102 passes the received data extracted by PS-Poll to the traffic monitoring unit 104 and the MAC control unit 107.
  • step S14 when the received data is passed, the traffic monitoring unit 104 counts the number of received data and measures the data interval.
  • step S15 when receiving the reception data extracted by PS-Poll from the wireless communication unit 102, the MAC control unit 107 transmits an ACK and confirms whether the data addressed to the own station is still buffered in the AP from the reception data. . If the data addressed to the own station is still buffered, the process returns to step S13 to transmit the PS-Poll again, continue to receive the buffered data, and repeat until there is no buffer for the data addressed to the own station.
  • the MAC control unit 107 controls the power supply control unit 103 to turn off the wireless communication unit 102, and transitions to the Doze state. In addition, the MAC control unit 107 notifies the traffic monitoring unit 104 of the end of traffic. As a result, the traffic monitoring unit 104 ends the measurement in step S17, the measured reception interval is the power save reception interval 112, the counted received data number is the received data number 113, and the line state such as RSSI is the line quality. 114 is stored in the memory 108.
  • the MAC control unit 107 when the MAC control unit 107 receives a notification of traffic information update completion from the traffic monitoring unit 104, the MAC control unit 107 requests the reception mode determination unit 109 to select a reception mode.
  • the reception mode determination unit 109 refers to the memory 108, determines a reception mode in which the power-off time of the wireless communication unit 102 is shorter, based on the reception interval, the number of received data, and the timer value in each reception mode, and performs MAC control.
  • the notification is sent to the unit 107 and this flow ends.
  • FIG. 5 is a flowchart showing the operation of the communication terminal apparatus 100 when receiving the active mode.
  • step S21 the MAC control unit 107 controls the power supply control unit 103 in the DTIM cycle to supply power to the wireless communication unit 102, transit to the awake state, and receive a beacon.
  • step S22 the MAC control unit 107 analyzes the Beacon information passed from the wireless communication unit 102 to confirm whether the data addressed to itself is buffered in the AP.
  • the MAC control unit 107 controls the power supply control unit 103 to turn off the power of the wireless communication unit 102 and transitions to the Doze state until the next DTIM timing.
  • step S23 the MAC control unit 107 transmits a NULL packet for notifying the AP of cancellation of power saving to the wireless communication unit 102 and enters the active mode.
  • step S24 the MAC control unit 107 requests the timer control unit 106 to start the timer count.
  • step S25 the MAC control unit 107 waits until data is received in the awake state or a time-out is notified from the timer control unit 106.
  • the wireless communication unit 102 passes the received data to the traffic monitoring unit 104 and the MAC control unit 107 in step S26.
  • the traffic monitoring unit 104 counts the number of received data and measures the data interval.
  • the MAC control unit 107 transmits ACK, clears the timer count, and newly requests the timer control unit 106 to start the timer count (return from step S26 to step S24).
  • step S27 When there is no reception data for a certain period of time and the MAC control unit 107 receives a timeout notification from the timer control unit 106 (step S27), the MAC control unit 107 notifies the AP of the power save mode transition in step S28. A NULL packet is transmitted, and a transition is made to the power save mode.
  • step S29 the MAC control unit 107 controls the power supply control unit 103 to turn off the wireless communication unit 102, and transitions to the Doze state.
  • step S30 the MAC control unit 107 notifies the traffic monitoring unit 104 of the end of traffic, so that the traffic monitoring unit 104 ends the measurement, and the received reception counted as the reception interval 111 in the active mode is the measured reception interval.
  • the number of data is stored in the memory 108 as the number of received data 113, and the line state such as RSSI is stored as the line quality 114.
  • the traffic monitoring unit 104 Upon receiving the traffic end notification, the traffic monitoring unit 104 notifies the timer determination unit 105 of the timer update.
  • the timer determination unit 105 Upon receiving the timer update notification in step S31, the timer determination unit 105 refers to the memory 108 and calculates a timer value based on the information on the active mode reception interval 111 and the line quality 114. The calculated timer value is stored in the timer value 115 of the memory 108 and passed to the timer control unit 106.
  • the MAC control unit 107 when the MAC control unit 107 receives a notification of traffic information update completion from the traffic monitoring unit 104, the MAC control unit 107 requests the reception mode determination unit 109 to select a reception mode.
  • the reception mode determination unit 109 refers to the memory 108, determines a reception mode with a shorter power-off time of the wireless communication unit 102 based on the reception interval, the number of received data, and the timer value in each reception mode, and performs MAC control.
  • the notification is sent to the unit 107 and this flow ends.
  • reception mode setting method in the reception mode determination unit 109 will be described in detail.
  • FIG. 6 is a flowchart showing the operation of the communication terminal device 100 when the reception mode is selected.
  • step S41 when receiving a notification that there is no data buffer in the power save mode or when a timeout occurs in the active mode, the MAC control unit 107 informs the reception mode determination unit 109 of the reception mode at the next Beacon WakeUP. Request the determination to the reception mode determination unit.
  • the reception mode determination unit 109 that has received the request refers to the active mode reception interval 111, the power save mode reception interval 112, the reception data number 113, and the timer value 115 from the memory 109.
  • step S43 the reception mode determination unit 109 confirms whether data is held in the active mode reception interval 111 and the power save mode reception interval 112.
  • the reception mode determination unit 109 compares the number of received data with a preset threshold value, and determines which mode is advantageous based on the result.
  • the threshold value here is, for example, 10 values.
  • step S43 when the reception interval in each reception mode is held, in step S45, the reception mode determination unit 109 estimates the awake time in the active mode and the awake time in the power save mode from the reference data, Compare which mode has a longer awake time.
  • the awake time in each mode is calculated by the following equations (1) and (2).
  • Awake time in active mode reception interval 111 in active mode ⁇ number of received data 113 + timer value 115 (1)
  • Awake time in power save mode reception interval 112 in power save mode x number of received data 113 (2) The results of the above formulas (1) and (2) are compared, and a mode with a short reception time is selected.
  • step S46 the reception mode determination unit 109 The control unit 107 is requested to receive in the active mode at the next Beacon timing.
  • step S44 If the number of received data is less than the threshold value in step S44, or if it is determined in step S45 that the awake time in the power save mode is short (Active> PS), a reception mode determination unit in step S47. 109 requests the MAC control unit 107 to receive in the power save mode at the next Beacon timing.
  • step S48 the MAC control unit 107 that has received the notification of the reception mode at the next Beacon timing from the reception mode determination unit 109 performs a reception operation according to the notified mode, and ends this flow.
  • FIG. 7 is a flowchart showing an operation of calculating the timer value of the timer determination unit 105.
  • the traffic monitoring unit 104 when the traffic monitoring unit 104 receives a traffic completion notification from the MAC control unit 107 in step S51, the traffic monitoring unit 104 notifies the timer determination unit 105 of a timer determination request.
  • step S52 the timer determination unit 105 that has received the request refers to the active mode reception time interval 111 that is traffic information from the memory.
  • step S53 the timer determination unit 105 calculates the average value of the acquired reception intervals 111 in the active mode and sets it as a timer.
  • the set timer is held in the timer value 115 of the memory 108 and is passed to the timer control unit 106.
  • step S54 the timer control unit 106 uses the timer value passed from the timer determination unit 105 and counts the timer when receiving a timer count start request from the MAC control unit 107. As a result, the determined timer is reflected. The operation is performed in the reception mode notified by the MAC control unit 107.
  • the average value calculation is illustrative and is not limited.
  • it can be carried out by other specific methods such as a maximum value of the designated number of packets and a value in which the designated number of packets is distributed in the dispersion value characteristic of the packet interval.
  • timer determination unit 105 determines a timer.
  • FIG. 8 is a flowchart showing the operation of setting the timer value of the timer determination unit 105.
  • step S61 the traffic monitoring unit 104 receives the timeout notification from the timer control unit 106 by the MAC control unit 107, or transmits the received traffic end notification in the power save mode. Check whether notification has been made.
  • the traffic monitoring unit 104 confirms the transmission speed of the received data in step S62. This is because when the transmission rate decreases or increases, the timer is optimized in accordance with the reception interval corresponding to the transmission rate.
  • step S63 the traffic monitoring unit 104 checks the value of the reception characteristic of RSSI or SNR (Signal power to Noise ⁇ power Ratio). This is because when the RSSI or SNR decreases, retransmission or the like occurs due to the deterioration of the reception characteristics, and therefore the reception interval is assumed to fluctuate accordingly. Therefore, it is necessary to optimize the timer accordingly. If there is a decrease in RSSI or SNR reception characteristics, the process proceeds to step S64, and if there is no decrease in RSSI or SNR reception characteristics, the process returns to step S61.
  • RSSI or SNR Signal to Noise ⁇ power Ratio
  • step S61 to step S63 if a timer setting trigger is detected, the traffic monitoring unit 104 makes a timer setting request to the timer determining unit 105 in step S64.
  • FIG. 9 is a flowchart showing reception method selection based on notification from the application unit 110.
  • step S71 the MAC control unit 107 receives a download request such as HTTP GET.
  • a download request such as HTTP GET is notified to the MAC control unit 107 by the application unit 110
  • the reception method in the active mode can efficiently acquire data, and therefore the reception method in the active mode is selected. Therefore, in step S72, the MAC control unit 107 requests the timer control unit 106 for timer count.
  • step S73 the MAC control unit 107 transmits a power save cancellation request to the AP, starts reception in the active mode, and ends this flow.
  • the traffic monitoring unit 104 monitors the packet interval of received data and the number of received data, and the timer determining unit 105 sets the received packet interval of received data. Based on the Awake state in the active mode, the timer value of the timer of the timer control unit 106 that shifts to the power save mode and transitions to the Doze state is set. For example, the timer determination unit 105 sets a timer time for transition to the Doze state when there is no traffic for a certain period of time.
  • the reception mode determination unit 109 selects a reception mode in which the awake state of the WLANCHIP (device) is shorter based on the reception interval and the number of reception data in each mode and the timer of the active mode, and the communication terminal apparatus 100 Reception can be performed in that mode.
  • the communication terminal device 100 sets the timer in the active mode according to the line state including the data interval and the retransmission according to the transmission rate of the received data, thereby reducing the throughput due to the timer becoming shorter than the reception data interval.
  • a terminal when a terminal receives data in legacy power saving of a wireless LAN-equipped terminal, it is necessary to transmit the same number of PS-Polls as the received data, and power and bandwidth are used for the transmission of the PS-Poll. Depending on the number of data, it may be inefficient. However, in the reception in the active mode, since there is no agreement on the transition to the Doze state, the timer must be set appropriately. On the other hand, in the present embodiment, communication terminal apparatus 100 appropriately sets a timer for shifting from the Awake state at the time of reception in the active mode to the Doze state in the power save mode based on the interval of received data and the wireless state. .
  • the reception data interval in each reception mode is held, the reception mode is selected so as to minimize the awake time based on the number of reception data and the timer time, and the timing is changed for each beacon. Energy consumption during reception can be optimized.
  • the traffic monitoring unit 104 monitors packet quality of received data, the number of data, and line quality such as RSSI and transmission speed.
  • the wireless state includes the above-described WLAN beacon or RSSI, SNR, and throughput of the received packet, for example, the PER (Packet Error Rate) of the WLAN transmission packet, the number of discarded packets, the number of times the WLAN packet is retransmitted, ACK, wireless LAN
  • PER Packet Error Rate
  • the names of a communication terminal device, a WLAN-equipped wireless terminal station, and a mode switching control method are used. However, this is for convenience of explanation, and a wireless terminal device, a wireless communication system, a reception mode switching method, etc. Of course, it may be.
  • any part of the communication terminal device and the reception method for example, the type, number and connection method of the MAC control unit may be used.
  • the reception method of the communication terminal apparatus described above is also realized by a program for causing this reception method to function.
  • This program is stored in a computer-readable recording medium.
  • the communication terminal apparatus and reception method according to the present invention can be widely applied to a wireless communication system in which a communication terminal apparatus constituting a wireless LAN and a wireless base station are connected.
  • the present invention can be widely applied to portable electronic devices having a wireless communication function such as notebook personal computers and PDAs.

Abstract

Disclosed are a communication terminal device and reception method in which the switching between an active mode and a power save mode can be optimized to promote the optimum reception and power saving. A traffic monitoring section (104) of a communication terminal device (100) monitors the packet interval of the received data and the number of received data. A timer determining section (105) sets the timer value of the timer of a timer control section (106), which moves from the Awake state of the active mode to the power save mode and transits to the Doze state on the basis of the packet interval of the received data held. For example, if there is no traffic for a certain period of time, the timer determining section (105) sets timer time to transit to the Doze state. A reception mode determining section (109) selects a reception mode in which the Awake state of WLANCHIP (device) becomes shorter on the basis of the reception intervals and the number of received data in the modes and the timing of the timer in the active mode.

Description

通信端末装置及び受信方法Communication terminal device and reception method
 本発明は、パワーセーブモードで動作する通信端末装置及び受信方法に関し、詳細には、電力消費を抑えるパワーセーブ機能が適用される無線LAN(WLAN:Wireless Local Area Network)システムにおける通信端末装置及びその受信方法に関する。 The present invention relates to a communication terminal apparatus and a receiving method that operate in a power save mode, and more particularly, to a communication terminal apparatus in a wireless LAN (WLAN: Wireless Local Area Network) system to which a power save function for reducing power consumption is applied, and the same It relates to the receiving method.
 近年、敷設の容易性、導入コストの経済性等を考慮して、オフィスや家庭等で、無線LANを構築するケースが増えてきている。無線LANの代表的な技術には、IEEE(Institute of Electrical and Electronics Engineers)802委員会により規格化された方式がある。IEEE802委員会で規格化された方式とは、例えばIEEE802.11標準方式,IEEE802.11a標準方式,IEEE802.11b標準方式,IEEE802.11g標準方式などが挙げられる。また、IEEE802.15.1で規定される無線通信プロトコルには、Bluetooth(登録商標)がある。 In recent years, the number of cases where a wireless LAN is constructed in an office, a home, or the like in consideration of easiness of installation and economics of introduction cost is increasing. As a representative technique of wireless LAN, there is a method standardized by the IEEE (Institute of Electrical and Electronics Electronics) 802 Committee. Examples of the system standardized by the IEEE 802 committee include the IEEE 802.11 standard system, the IEEE 802.11a standard system, the IEEE 802.11b standard system, and the IEEE 802.11g standard system. Further, Bluetooth (registered trademark) is a wireless communication protocol defined by IEEE 802.15.1.
 無線LAN対応の通信端末に関する通信規格では、アクセスポイントからの自機宛てのパケットの受信を定期的に停止することによって、間欠的に仮眠状態となり電力を節約するパワーセーブモード(PSモード)が規定されている(例えば、IEEE802.11規格参照)。無線LAN対応の通信端末装置では、無線LAN部の消費電力が大きいため、常にオンさせておくと、携帯機器のバッテリが短期間に消耗してしまう。そこで、アクセスポイントからの自機宛てのパケットの受信を定期的に行うようにし、パケットの受信停止期間において、電力消費の多い無線通信部の少なくとも一部(A/D変換器が含まれる場合がある)の電源をオフし、電力消費を抑える。 The communication standard related to wireless LAN-compatible communication terminals defines a power save mode (PS mode) in which the reception of packets addressed to the device from the access point is periodically stopped to intermittently become a nap and save power. (See, for example, the IEEE 802.11 standard). In a wireless LAN-compatible communication terminal device, the power consumption of the wireless LAN unit is large, so if it is always turned on, the battery of the portable device will be consumed in a short time. Therefore, the reception of packets addressed to itself from the access point is periodically performed, and at least a part of the wireless communication unit (A / D converter may be included) that consumes much power during the packet reception stop period. Turn off the power supply to reduce power consumption.
 IEEE802.11無線LANには、端末のバッテリ消費量を抑制するためのパワーマネジメント機能があり、標準規格においては、パワーマネジメントモードの変更を行うための方法と、パワーセーブ中の端末局がAP(Access Point)とデータを送受信するための方法が規定されている。 The IEEE802.11 wireless LAN has a power management function for suppressing the battery consumption of the terminal. According to the standard, a method for changing the power management mode and a terminal station that is in the power saving state are AP ( A method for sending and receiving data to / from Access Point is defined.
 パワーマネジメントに関する端末(ステーション)の動作モードとしては、アクティブモードとパワーセーブモードがある。アクティブモードにおいては、端末局は常時送受信が可能なAwake状態であり、パワーセーブモードにおいてはAwake状態と送受信不能な最小限の電力で動作するDoze状態を間欠に遷移し、パワーセーブモードで動作している端末がフレームの送受信を行えるのは、Awake状態のときのみである。 The terminal (station) operation mode related to power management includes active mode and power save mode. In the active mode, the terminal station is in an awake state in which transmission / reception is possible at all times, and in the power save mode, the awake state and the doze state that operates with a minimum power that cannot be transmitted / received are intermittently changed to operate in the power save mode. A terminal that can send and receive a frame can only send and receive frames when in the Awake state.
 パワーセーブモードで動作する端末は、ベース装置から送信されるビーコンのタイミングに合わせて、Doze状態からAwake状態に移行して受信動作を行う。また、端末は、パワーセーブモードとアクティブモードの間の動作モード遷移時には、APに動作モードの変更を通知する。 The terminal operating in the power save mode performs a reception operation by shifting from the Doze state to the Awake state in accordance with the timing of the beacon transmitted from the base device. In addition, the terminal notifies the AP of the change of the operation mode when the operation mode transitions between the power save mode and the active mode.
 パワーマネジメントの動作モードを変更する場合は、端末局が送信するフレームのフレーム制御フィールド内にあるパワーマネジメントビットを使用し、APに通知する。 When changing the operation mode of power management, the power management bit in the frame control field of the frame transmitted by the terminal station is used to notify the AP.
 APにパワーセーブモードでの動作を通知すると、APはパワーセーブで動作する端末局宛のデータを一時的にバッファリングし、Beacon内のトラフィック表示マップ(TIM:Traffic Indication Map)により、パケットがバッファされていることを通知する。アクティブモードで動作する端末局宛のデータはバッファされない。 When the AP is notified of the operation in the power save mode, the AP temporarily buffers the data addressed to the terminal station operating in the power save mode, and the packet is buffered by the traffic indication map (TIM: Traffic Indication Map) in the Beacon. To be informed. Data destined for terminal stations operating in active mode is not buffered.
 端末局のパワーセーブモード時における受信動作は、APからのBeaconタイミングに合わせてDoze状態からAwake状態に移行して受信動作を行う。APから端末局宛のデータが蓄積されるか否かをTIM情報要素により通知を受け、自局宛のデータがある場合には、PS-Pollという制御フレームを送信することで、APからデータを引き出す。APに蓄積されたデータの有無はフレーム制御フィールドで確認ができ、なくなり次第すぐにDoze状態に遷移が可能となる。 The reception operation in the power save mode of the terminal station is performed by shifting from the Doze state to the Awake state in accordance with the Beacon timing from the AP. Whether or not the data addressed to the terminal station is accumulated from the AP is notified by the TIM information element, and when there is data addressed to the local station, the data is transmitted from the AP by transmitting a control frame called PS-Poll. Pull out. The presence / absence of data accumulated in the AP can be confirmed in the frame control field, and as soon as it is gone, it is possible to transition to the Doze state.
 しかし、上記のような受信動作を実施するレガシーパワーセーブにおいては、受信データに対して同数の制御フレームの送信が必要となるため、その送信電流や制御フレーム送信用の帯域を考慮すると、データ受信量によってはアクティブモードでの受信の方が効率よく受信できる状況がある。 However, in the legacy power save that performs the reception operation as described above, since the same number of control frames need to be transmitted with respect to the received data, the data reception is considered in consideration of the transmission current and the bandwidth for transmitting the control frame. Depending on the amount, there are situations where reception in the active mode can be received more efficiently.
 アクティブモードにおいては、上記のように効率よく送受信することが可能であるが、消費電力が抑制されない。そのため、移動局がアクティブモードにおいて待機状態を維持する場合は、消費電力が抑制されないため、パワーセーブモードに切り替え電力消費を節約する必要がある。アクティブモードに遷移した場合は、消費電力的にパワーセーブモードに戻す必要があり、そのタイミングを設定する必要がある。アクティブモードではデータの有り無しが通知されないため、いつアクティブモードに移行すべきか分からない。 In the active mode, it is possible to efficiently transmit and receive as described above, but power consumption is not suppressed. Therefore, when the mobile station maintains the standby state in the active mode, the power consumption is not suppressed, so it is necessary to switch to the power save mode to save the power consumption. When transitioning to the active mode, it is necessary to return to the power save mode in terms of power consumption, and it is necessary to set the timing. In active mode, the presence or absence of data is not notified, so it is not known when to shift to active mode.
 アクティブモードとパワーセーブモードを自動的に切り替える方法としては、タイマを用いてデータの送受信がない待機状態が長く続く場合に、アクティブモードからパワーセーブモードに切り替える方法が従来から使われている。 As a method of automatically switching between the active mode and the power save mode, a method of switching from the active mode to the power save mode when a standby state in which no data is transmitted and received continues for a long time using a timer has been conventionally used.
 図1A,Bは、各受信モードにおけるデータ送受信過程の例を説明する図であり、図1Aはパワーセーブモードでの受信シーケンスを、図1Bはアクティブモードでの受信シーケンスをそれぞれ示す。 FIGS. 1A and 1B are diagrams for explaining an example of a data transmission / reception process in each reception mode. FIG. 1A shows a reception sequence in the power save mode, and FIG. 1B shows a reception sequence in the active mode.
 図1Aは、パワーセーブモードでの送受信を行う場合である。パワーセーブモードは、アクティブモードでのタイマ動作によりパワーセーブモードに移行する。端末局は、Beacon受信タイミングでDoze状態からAwake状態となりBeaconを受信する。バッファデータが存在する場合には、MoreDataフラグが0になるまで、PS-Pollを送信しデータを受信する。MoreDataフラグが0になると、Doze状態に遷移し電力消費を抑える。 FIG. 1A shows a case where transmission / reception is performed in the power save mode. The power save mode shifts to the power save mode by the timer operation in the active mode. The terminal station changes from the Doze state to the Awake state at the Beacon reception timing, and receives the Beacon. If buffer data exists, PS-Poll is transmitted and data is received until the MoreData flag becomes 0. When the MoreData flag becomes 0, the state transitions to the Doze state to suppress power consumption.
 図1Bは、送受信時をアクティブモードで行う場合である。Beacon受信タイミングでDoze状態からAwake状態となりBeaconを受信する。バッファデータが存在する場合には、アクティブモードで受信するために、APにパワーセーブを解除するための通知パケットを送信する。各データの受信確認応答(ACK)を送信毎にタイマを起動し、一定時間データを受信しない場合には、パワーセーブ移行の通知パケットを送信し、Doze状態となる。しかし、このタイマは固定として与えられ、必ずしも効率の良い切り替えが行われていない問題がある。 FIG. 1B shows a case where transmission / reception is performed in an active mode. At the Beacon reception timing, the Doze state is changed to the Awake state, and the Beacon is received. When the buffer data exists, a notification packet for canceling the power save is transmitted to the AP for reception in the active mode. A timer is started each time a reception confirmation response (ACK) of each data is transmitted, and when data is not received for a certain period of time, a power save transition notification packet is transmitted to enter the Doze state. However, this timer is given as fixed, and there is a problem that efficient switching is not necessarily performed.
 また、特許文献1には、WLANにおけるアクティブモードとパワーセーブモードの切り替えを順次行い、省電力化する無線通信方法が記載されている。特許文献1記載の無線通信方法によると、端末局がパワーセーブモードで動作する場合のパケット遅延やバッファ溢れによるパケットロスを低減して、制御フレーム送信によるスループットの低下を防止し、リアルタイム通信において省電力化を実現することができる。
特開2007-19607号公報
Patent Document 1 describes a wireless communication method that saves power by sequentially switching between an active mode and a power save mode in a WLAN. According to the wireless communication method described in Patent Document 1, packet loss due to packet delay or buffer overflow when the terminal station operates in the power save mode is reduced, and a drop in throughput due to control frame transmission is prevented. Electricity can be realized.
JP 2007-19607 A
 しかしながら、このような従来のパワーセーブモードで動作する無線端末装置にあっては、アクティブモードにおいてもAPがバッファリングされた端末局宛のデータの有無を通知しており、これは802.11規格に規定されている機能ではない。よってAP側にもそのような機能を新規に追加する必要があり、汎用のAPでは動作が困難となる。 However, in such a wireless terminal device operating in the conventional power save mode, the presence / absence of data addressed to the terminal station where the AP is buffered is notified even in the active mode, which is the 802.11 standard. It is not a function specified in. Therefore, it is necessary to newly add such a function to the AP side, which makes it difficult to operate with a general-purpose AP.
 また、タイマに同期してアクティブモードに移行するため、同期処理が必要となることや、リアルタイム通信のような周期的なトラフィックには適用できるが、ダウンロードのような周期的でないトラフィックには適用できないという課題がある。 In addition, since it shifts to the active mode in synchronization with the timer, synchronization processing is necessary and it can be applied to periodic traffic such as real-time communication, but it cannot be applied to non-periodic traffic such as download. There is a problem.
 また、従来のように固定値のタイマを設定し、その間受信データがない場合にパワーセーブモードに切り替える制御方法においては、タイマが常に最適な設定であるとは限らない。 Also, in a control method in which a fixed timer is set as in the prior art and the power saving mode is switched when there is no received data during that period, the timer is not always optimally set.
 図2A,Bは、タイマ値によるデータ送受信過程の例を説明する図であり、図2Aはタイマが短いときの受信シーケンスを、図2Bはタイマが長いときの受信シーケンスをそれぞれ示す。 2A and 2B are diagrams for explaining an example of a data transmission / reception process using a timer value. FIG. 2A shows a reception sequence when the timer is short, and FIG. 2B shows a reception sequence when the timer is long.
 図2Aに示すように、タイマ設定が短すぎる場合には、APにバッファされているDataを全て取ることができずパワーセーブ状態になる可能性があり、電力消費は低減されるもののスループットが低下することになる。また、図2Bに示すように、タイマが長すぎる場合は、APにバッファされたデータを受信後に新規にネットワークから送信されるデータを受信し続けることになり、電力消費が抑制できない。 As shown in FIG. 2A, if the timer setting is too short, not all the data buffered in the AP can be taken, and there is a possibility that the power saving state may occur, and the power consumption is reduced but the throughput is reduced. Will do. Also, as shown in FIG. 2B, if the timer is too long, it continues receiving new data transmitted from the network after receiving data buffered in the AP, and power consumption cannot be suppressed.
 本発明の目的は、アクティブモードとパワーセーブモードの切り替えを最適化して、最適な受信と省電力化を図ることができる通信端末装置及び受信方法を提供することである。 An object of the present invention is to provide a communication terminal device and a receiving method capable of optimizing switching between an active mode and a power save mode to achieve optimum reception and power saving.
 本発明の通信端末装置は、アクティブモードと、PS-Pollによるポーリング処理に基づくパワーセーブモードとを有する通信端末装置であって、受信トラフィックを監視し、受信データのパケット間隔及び受信データ数を保持する受信トラフィック監視手段と、保持された受信データのパケット間隔に基づいて、アクティブモードのAwake状態からパワーセーブモードに移行しDoze状態に遷移するタイマのタイマ値を設定する制御手段と、各モードにおける受信間隔及び受信データ数と、アクティブモードにおける前記タイマの計時に基づいて、モードを切り替える受信モード決定手段と、を備える構成を採る。 The communication terminal apparatus of the present invention is a communication terminal apparatus having an active mode and a power save mode based on a polling process by PS-Poll, monitoring received traffic, and maintaining a packet interval of received data and the number of received data Receiving traffic monitoring means, a control means for setting a timer value of a timer that transitions from the Awake state in the active mode to the power save mode and transitions to the Doze state based on the held packet interval of the received data, and in each mode A configuration is adopted that includes a reception interval, the number of received data, and a reception mode determining means for switching modes based on the time of the timer in the active mode.
 本発明の受信方法は、アクティブモードと、PS-Pollによるポーリング処理に基づくパワーセーブモードとを有する通信端末装置の受信方法であって、受信トラフィックを監視し、受信データのパケット間隔及び受信データ数を保持する監視ステップと、保持された受信データのパケット間隔に基づいて、アクティブモードのAwake状態からパワーセーブモードに移行しDoze状態に遷移するタイマのタイマ値を設定する制御ステップと、各モードにおける受信間隔及び受信データ数と、アクティブモードにおける前記タイマの計時に基づいて、モードを切り替える選択ステップとを有する。 The reception method of the present invention is a reception method of a communication terminal apparatus having an active mode and a power save mode based on a polling process by PS-Poll, which monitors received traffic, and is a packet interval of received data and the number of received data And a control step for setting a timer value of a timer that shifts from the Awake state in the active mode to the power save mode and transitions to the Doze state based on the packet interval of the held reception data. And a selection step of switching modes based on the reception interval and the number of received data and the timing of the timer in the active mode.
 本発明によれば、受信データのパケット間隔によりタイマを設定することにより、アクティブモードにおける受信時のAwake状態からパワーセーブモードのDoze状態に移るタイマを適宜、最適に設定するので、受信データ間隔よりタイマが短くなることによるスループットの低下や、タイマが長くなることで新規にネットワークから送信されるデータを取り続けることによる電力消費を抑えることができる。 According to the present invention, by setting the timer according to the packet interval of the received data, the timer for shifting from the Awake state at the time of reception in the active mode to the Doze state of the power save mode is appropriately and appropriately set. A reduction in throughput due to the shortening of the timer and a reduction in power consumption due to the continuous acquisition of data transmitted from the network due to the extension of the timer can be suppressed.
 また、受信パケット数とタイマ値によりデバイスのAwake状態が最小となるように受信モードを切り替えることで、最適な受信を行うことができる。 Also, optimal reception can be performed by switching the reception mode so that the device awake state is minimized by the number of received packets and the timer value.
 また、各受信モードにおける受信データの間隔を保持し、受信データ数とそのタイマ時間とによりAwake時間を最小となるように受信モードを選択し、Beacon毎のタイミングで切り替えることで、受信時のエネルギ消費を最適化することができる。 Also, the reception data interval in each reception mode is maintained, the reception mode is selected so as to minimize the awake time according to the number of reception data and the timer time, and switching at the timing of each beacon makes it possible to change the energy at the time of reception. Consumption can be optimized.
IEEE802.11で規定されたパワーセーブモードを有する無線端末局の受信モードにおけるデータ送受信過程の例を説明する図The figure explaining the example of the data transmission / reception process in the reception mode of the radio | wireless terminal station which has the power save mode prescribed | regulated by IEEE802.11. IEEE802.11で規定されたパワーセーブモードを有する無線端末局の受信モードにおけるデータ送受信過程の例を説明する図The figure explaining the example of the data transmission / reception process in the reception mode of the radio | wireless terminal station which has the power save mode prescribed | regulated by IEEE802.11. IEEE802.11で規定されたパワーセーブモードを有する無線端末局のタイマ値によるデータ送受信過程の例を説明する図The figure explaining the example of the data transmission / reception process by the timer value of the radio | wireless terminal station which has the power save mode prescribed | regulated by IEEE802.11. IEEE802.11で規定されたパワーセーブモードを有する無線端末局のタイマ値によるデータ送受信過程の例を説明する図The figure explaining the example of the data transmission / reception process by the timer value of the radio | wireless terminal station which has the power save mode prescribed | regulated by IEEE802.11. 本発明の実施の形態に係る通信端末装置の構成を示すブロック図The block diagram which shows the structure of the communication terminal device which concerns on embodiment of this invention 本実施の形態に係る通信端末装置のパワーセーブモード受信時の動作を示すフロー図The flowchart which shows the operation | movement at the time of power save mode reception of the communication terminal device which concerns on this Embodiment 本実施の形態に係る通信端末装置のアクティブモード受信時の動作を示すフロー図The flowchart which shows the operation | movement at the time of active mode reception of the communication terminal device which concerns on this Embodiment 本実施の形態に係る通信端末装置の受信モード選択時の動作を示すフロー図The flowchart which shows the operation | movement at the time of the reception mode selection of the communication terminal device which concerns on this Embodiment 本実施の形態に係る通信端末装置のタイマ決定部のタイマ値を算出する動作を示すフロー図The flowchart which shows the operation | movement which calculates the timer value of the timer determination part of the communication terminal device which concerns on this Embodiment 本実施の形態に係る通信端末装置のタイマ決定部のタイマ値を設定する動作を示すフロー図The flowchart which shows the operation | movement which sets the timer value of the timer determination part of the communication terminal device which concerns on this Embodiment 本実施の形態に係る通信端末装置のアプリケーション部の通知による受信方法選択を示すフロー図The flowchart which shows the receiving method selection by the notification of the application part of the communication terminal device which concerns on this Embodiment
 以下、本発明の実施の形態について図面を参照して詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
 (実施の形態)
 図3は、本発明の一実施の形態に係る通信端末装置の構成を示すブロック図である。本実施の形態は、WLAN搭載端末の無線端末局に適用した例である。無線通信システムは、通信端末装置、アクセスポイントAP、及びネットワークを備えて構成される。
(Embodiment)
FIG. 3 is a block diagram showing a configuration of a communication terminal apparatus according to an embodiment of the present invention. This embodiment is an example applied to a wireless terminal station of a WLAN-equipped terminal. The wireless communication system includes a communication terminal device, an access point AP, and a network.
 図3において、通信端末装置100は、無線LAN機能を有するPHS(Personal Handy-Phone System)/携帯電話機、PDA(Personal Digital Assistants)等の携帯端末装置であり、APに接続して無線通信を行う。通信端末装置100は、アクティブモードと、PS-Pollによるポーリング処理に基づくパワーセーブモードとを有する。通信端末装置100は、周辺に存在するAPからBeaconを受信して、APのネットワーク名、通信機器の通信速度、セキュリティ強度、通信チャンネル、及び電波強度を取得する。 In FIG. 3, a communication terminal device 100 is a portable terminal device such as a PHS (Personal Handy-Phone System) / cell phone, PDA (Personal Digital Assistant) having a wireless LAN function, and performs wireless communication by connecting to an AP. . Communication terminal apparatus 100 has an active mode and a power save mode based on a polling process by PS-Poll. The communication terminal device 100 receives a beacon from an AP existing in the vicinity, and acquires the AP network name, the communication speed of the communication device, the security strength, the communication channel, and the radio wave strength.
 通信端末装置100は、アンテナ101、無線通信部102、電源制御部103、トラフィック監視部104、タイマ決定部105、タイマ制御部106、MAC(Medium Access Control:媒体アクセス制御)制御部107、メモリ108、受信モード決定部109、及びアプリケーション部110を備えて構成される。 The communication terminal device 100 includes an antenna 101, a wireless communication unit 102, a power supply control unit 103, a traffic monitoring unit 104, a timer determination unit 105, a timer control unit 106, a MAC (Medium Access Control) medium control unit 107, and a memory 108. A reception mode determination unit 109 and an application unit 110.
 アンテナ101は、通信端末装置100が受信信号を無線通信部102に出力するとともに、無線通信部102から入力される送信信号を送信する。 The antenna 101 transmits a transmission signal input from the wireless communication unit 102 while the communication terminal apparatus 100 outputs a reception signal to the wireless communication unit 102.
 無線通信部102は、MAC制御部107から入力されたデータを無線で送信する処理を行う。また、無線通信部102は、受信したデータをMAC制御部107及びトラフィック監視部104へ出力する処理を行う。電源制御部103により、無線通信部102の回路の電源の投入及び切断が行われる。 The wireless communication unit 102 performs processing for wirelessly transmitting data input from the MAC control unit 107. In addition, the wireless communication unit 102 performs processing for outputting the received data to the MAC control unit 107 and the traffic monitoring unit 104. The power supply control unit 103 turns on and off the circuit of the wireless communication unit 102.
 電源制御部103は、MAC制御部107からの電源投入及び切断の要求に従い、無線通信部102の電源を制御する。 The power control unit 103 controls the power supply of the wireless communication unit 102 in accordance with the power on / off request from the MAC control unit 107.
 トラフィック監視部104は、無線通信部102から入力された受信データのパケット間隔、受信データ数及びRSSI(Received Signal Strength Indicator)や伝送速度等の回線品質をモニタし、その結果をMAC制御部107からトラフィック終了の通知を受けるとメモリ108に書き込む。また、トラフィック監視部104は、回線品質のモニタにおいて、品質の改善及び悪化が検出された場合には、タイマ決定部105にタイマの再設定の要求を行う。 The traffic monitoring unit 104 monitors the packet quality of received data input from the wireless communication unit 102, the number of received data, the line quality such as RSSI (Received Signal Strength Indicator) and transmission speed, and the result is sent from the MAC control unit 107. When a notification of traffic end is received, it is written in the memory 108. In addition, the traffic monitoring unit 104 requests the timer determination unit 105 to reset the timer when quality improvement and deterioration are detected in the line quality monitoring.
 タイマ決定部105は、トラフィック監視部104からのタイマ決定要求を受けると、メモリ108のアクティブモード時受信間隔111及び回線品質114を参照してタイマ値を決定し、その値をタイマ制御部106に渡すとともに、メモリ108のタイマ値115に格納する。タイマ決定部105は、保持された受信データのパケット間隔に基づいて、アクティブモードのAwake状態からパワーセーブモードに移行しDoze状態に遷移するタイマのタイマ値を設定する制御手段としての機能を有する。例えば、受信トラフィック監視部104が、受信パケット間隔をモニタすることで一定時間トラフィックが無い場合に、タイマ決定部105は、Doze状態に遷移するタイマ時間を設定する。 Upon receiving a timer determination request from the traffic monitoring unit 104, the timer determination unit 105 determines a timer value with reference to the active mode reception interval 111 and the line quality 114 of the memory 108, and sends the value to the timer control unit 106. At the same time, it is stored in the timer value 115 of the memory 108. The timer determination unit 105 has a function as a control unit that sets a timer value of a timer that shifts from the active mode Awake state to the power save mode and transitions to the Doze state based on the held packet interval of the received data. For example, when the received traffic monitoring unit 104 monitors the received packet interval and there is no traffic for a certain period of time, the timer determining unit 105 sets a timer time for transition to the Doze state.
 タイマ制御部106は、アクティブモードのAwake状態からパワーセーブモードに移行しDoze状態に遷移する計時を行うタイマを有し、MAC制御部107の制御に基づきタイマをカウントする。タイマ制御部106は、タイマ決定部105により通知されたタイマ時間までカウントした場合は、MAC制御部107にタイムアウト通知を行う。 The timer control unit 106 has a timer for measuring the time from the Awake state in the active mode to the power save mode and transitioning to the Doze state, and counts the timer based on the control of the MAC control unit 107. When the timer control unit 106 counts up to the timer time notified by the timer determination unit 105, the timer control unit 106 notifies the MAC control unit 107 of a timeout.
 MAC制御部107は、アプリケーション部110から入力されたデータを無線通信部102へ渡し送信するための制御を、また、無線通信部102で受信したデータをアプリケーション部110に渡す制御を行う。MAC制御部107は、上記無線区間のアクセス制御の基本機能に加え、以下のモード切替制御を行うことを特徴とする。 The MAC control unit 107 performs control for passing and transmitting data input from the application unit 110 to the wireless communication unit 102, and performs control for passing data received by the wireless communication unit 102 to the application unit 110. The MAC control unit 107 is characterized by performing the following mode switching control in addition to the basic function of access control in the wireless section.
 MAC制御部107は、受信モード決定部109から通知された受信モードに基づき、電源制御部103を制御する。すなわち、パワーセーブモードにおいて受信する場合は、無線通信部102から入力された受信データにより、自局宛データあり通知がある場合には、無線通信部102からPS-Pollを送信する制御を行い、自局宛データがない通知を受けた場合には、電源制御部103に無線通信部102の電源切断を要求する。タイマ機能付きアクティブモードにおいて受信する場合には、自局宛データありの通知を受けると、電源制御部103に無線通信部102に電源投入を要求するとともに、無線通信部102からパワーセーブ解除を通知するパケットを送信する。タイマ制御部107により、タイムアウト通知を受けた場合には、無線通信部102よりパワーセーブモード移行を通知するパケットを送信するとともに、電源制御部103に無線通信部102の電源切断を要求する。さらに、トラフィック終了の通知をトラフィック監視部104に通知する。 The MAC control unit 107 controls the power supply control unit 103 based on the reception mode notified from the reception mode determination unit 109. That is, when receiving in the power save mode, when there is a notification that there is data addressed to the own station from the received data input from the wireless communication unit 102, control is performed to transmit PS-Poll from the wireless communication unit 102, When receiving a notification that there is no data addressed to the own station, the power supply control unit 103 is requested to turn off the wireless communication unit 102. When receiving in the active mode with a timer function, upon receiving a notification that there is data addressed to the own station, the power supply control unit 103 is requested to turn on the power to the wireless communication unit 102 and the wireless communication unit 102 is notified of the release of power saving. Send a packet. When the timer control unit 107 receives a timeout notification, the wireless communication unit 102 transmits a packet notifying the transition to the power save mode and requests the power supply control unit 103 to turn off the wireless communication unit 102. Further, the traffic monitoring unit 104 is notified of the traffic end.
 また、アプリケーション部110から送信データを受け取った場合には、電源制御部103に無線通信部102の電源投入を要求する。 Further, when transmission data is received from the application unit 110, the power control unit 103 is requested to turn on the wireless communication unit 102.
 MAC制御部107は、受信モード決定部109により通知された受信モードによりタイマ制御部106の開始及び停止を制御する。また無線通信部102からデータを受信した場合には、タイマ制御部106にタイマカウントのクリアを要求する。 The MAC control unit 107 controls the start and stop of the timer control unit 106 according to the reception mode notified by the reception mode determination unit 109. When data is received from the wireless communication unit 102, the timer control unit 106 is requested to clear the timer count.
 また、MAC制御部107は、DTIM(Delivery Traffic Indication Message)間隔等周期的に受信モード決定部109に受信モード決定要求を送信する。 In addition, the MAC control unit 107 transmits a reception mode determination request to the reception mode determination unit 109 periodically such as a DTIM (Delivery Traffic Indication Message) interval.
 メモリ108は、トラフィック監視部104により検出されたアクティブモード時受信間隔111、パワーセーブモード時受信間隔112、受信データ数113、及び回線品質114を保持する。また、メモリ108は、タイマ決定部109により決められたタイマ値115を保持する。 The memory 108 holds the reception interval 111 in the active mode, the reception interval 112 in the power save mode, the number of received data 113, and the line quality 114 detected by the traffic monitoring unit 104. In addition, the memory 108 holds a timer value 115 determined by the timer determination unit 109.
 受信モード決定部109は、MAC制御部107からの受信モード決定要求を受けたときに、メモリ108に書き込まれたアクティブモード時受信間隔111、パワーセーブモード時受信間隔112、受信データ数113やタイマ値115を参照し、より長く電源を切断できる受信モードを決定し、MAC制御部107に受信モードを通知する。受信モード決定部109は、各モードにおける受信間隔及び受信データ数と、アクティブモードにおけるタイマの計時に基づいて、Awake時間が短くなるモードを選択する。すなわち、受信モード決定部109は、各Beaconタイミングにおいて、保持された各受信モードにおける受信間隔、受信データ数及びタイマから、WLANCHIP(デバイス)のAwake状態がより短くなる受信モードを選択し、通信端末装置100はそのモードで受信を行うことができる。 The reception mode determination unit 109 receives the reception mode determination request from the MAC control unit 107, the reception interval 111 in the active mode, the reception interval 112 in the power save mode, the reception data number 113 and the timer written in the memory 108 With reference to value 115, a reception mode in which the power can be disconnected for a longer time is determined, and the MAC control unit 107 is notified of the reception mode. The reception mode determination unit 109 selects a mode in which the awake time is shortened based on the reception interval and the number of reception data in each mode and the timer in the active mode. That is, at each Beacon timing, reception mode determination section 109 selects a reception mode in which the awake state of WLANCHIP (device) is shorter from the received reception interval, number of received data, and timer in each reception mode, and the communication terminal Device 100 can receive in that mode.
 アプリケーション部110は、当該無線端末局で動作中の通信アプリケーションであり、送信するデータをMAC制御部107に渡し、受信データはMAC制御部107により受け取る。 The application unit 110 is a communication application operating in the wireless terminal station, passes data to be transmitted to the MAC control unit 107, and receives received data by the MAC control unit 107.
 以下、上述のように構成された通信端末装置の動作を説明する。まず、通信端末装置100の全体動作について述べる。 Hereinafter, the operation of the communication terminal apparatus configured as described above will be described. First, the overall operation of communication terminal apparatus 100 will be described.
 通信端末装置100は起動後、APと接続処理が行われ、アプリケーション部110が動作していない場合には、待ち受け状態となる。電力消費の関係上、受信モードのデフォルトはパワーセーブモードによる受信となり、通常のパワーセーブ動作を実施する。すなわち、DTIM間隔による間欠受信動作を行う。 The communication terminal device 100 is connected to the AP after being activated, and enters a standby state when the application unit 110 is not operating. Due to power consumption, the default reception mode is reception in the power save mode, and normal power save operation is performed. That is, an intermittent reception operation is performed at a DTIM interval.
 アプリケーション部110が動作すると、実際に通信が開始される。無線通信部102で受信されたBeaconにより、MAC制御部107において自局宛の下りパケットの存在が検出されると、通信端末装置100は、パワーセーブ受信モードの動作において、PS-Pollを無線通信部102から送信することで下りパケットを取得する。全下りパケットを取得したときは、電源制御部103を制御し無線通信部102の電源を切断し、Doze状態に遷移する。DTIM間隔後、MAC制御部107はBeaconを受信するために、電源制御部103を制御し無線通信部102の電源を供給し、Awake状態に遷移する。 When the application unit 110 operates, communication is actually started. When the MAC control unit 107 detects the presence of a downlink packet addressed to itself by Beacon received by the wireless communication unit 102, the communication terminal apparatus 100 performs wireless communication with PS-Poll in the power save reception mode operation. A downlink packet is acquired by transmitting from the unit 102. When all downlink packets are acquired, the power supply control unit 103 is controlled to turn off the wireless communication unit 102 and transition to the Doze state. After the DTIM interval, the MAC control unit 107 controls the power supply control unit 103 to supply power to the wireless communication unit 102 in order to receive Beacon, and transitions to the Awake state.
 また、下りパケットはトラフィック監視部104においてモニタされ、各受信モードにおける受信間隔、受信データ数やRSSI等の回線品質の情報がメモリ108に保持される。その情報に基づき、受信モード決定部109がより省電力となる受信モードを選択しMAC制御部107に通知する。また、タイマ決定部105はトラフィック監視部104によりタイマ決定の要求を受けると、メモリ108の情報を参照してタイマ値を決定し、タイマ制御部106に渡すとともに、メモリ108にタイマ値を保持する。 Further, the downstream packet is monitored by the traffic monitoring unit 104, and information on the line quality such as the reception interval, the number of received data, and RSSI in each reception mode is held in the memory 108. Based on the information, the reception mode determination unit 109 selects a reception mode that saves more power and notifies the MAC control unit 107 of the reception mode. When the timer determination unit 105 receives a timer determination request from the traffic monitoring unit 104, the timer determination unit 105 determines a timer value by referring to information in the memory 108, passes the timer value to the timer control unit 106, and holds the timer value in the memory 108. .
 MAC制御部107は、WakeUPタイミングに合わせて受信モード決定部109に対して、受信モード決定の要求を渡す。受信モード決定部109により決定された受信モードがMAC制御部107に通知されると、MAC制御部は設定された受信モードに基づき、電源制御部103を制御する。また、タイマ制御部106は、MAC制御部107よりアクティブ受信モードに切り替わった時点でタイマの開始が指示され、パワーセーブ受信モードに切り替わった時点でタイマの停止が指示される。 The MAC control unit 107 passes a reception mode determination request to the reception mode determination unit 109 in accordance with the WakeUP timing. When the reception mode determined by the reception mode determination unit 109 is notified to the MAC control unit 107, the MAC control unit controls the power supply control unit 103 based on the set reception mode. The timer control unit 106 is instructed by the MAC control unit 107 to start the timer when the mode is switched to the active reception mode, and is instructed to stop the timer when the mode is switched to the power save reception mode.
 アクティブモードでの受信時には、無線通信部102で受信されたBeaconにより、MAC制御部107において自局宛の下りパケットの存在が検出されると、通信端末装置100はアクセスポイントにパワーセーブ解除を通知するためのパケットを送信する。MAC制御部107は、受信パケットに対するACK応答を送信時に、タイマ制御部106にタイマカウントのクリアを要求する。アクティブモード受信中において、トラフィック監視部104において、回線品質が変化した場合、例えば伝送速度の低下やRSSIの低下が検知された場合には、タイマ決定部105にタイマ設定の要求を出し、再度タイマの設定が行われる。更新されたタイマ値はタイマ制御部106とメモリ108に渡される。タイマ制御部106により、タイマ値のタイムアウトの通知を受けた場合には、APで保持されている受信パケットが無いと判断し、パワーセーブ移行を通知するためのパケットを無線通信部102より送信するとともに、電源制御部103に無線通信部102の電源を切断する制御を行い、Doze状態に遷移する。 During reception in the active mode, when the presence of a downstream packet addressed to the own station is detected by the MAC control unit 107 by the Beacon received by the wireless communication unit 102, the communication terminal apparatus 100 notifies the access point of canceling the power save. To send a packet. The MAC control unit 107 requests the timer control unit 106 to clear the timer count when transmitting an ACK response to the received packet. During the active mode reception, when the traffic quality is changed in the traffic monitoring unit 104, for example, when a decrease in transmission speed or a decrease in RSSI is detected, a request for timer setting is issued to the timer determining unit 105, and the timer is set again. Is set. The updated timer value is passed to the timer control unit 106 and the memory 108. When the timer control unit 106 receives a timer value timeout notification, the wireless communication unit 102 determines that there is no received packet held by the AP and transmits a packet for notifying the power save transition from the wireless communication unit 102. At the same time, the power supply control unit 103 is controlled to turn off the power of the wireless communication unit 102, and the state transitions to the Doze state.
 また、接続していたアプリケーションの通信が切断されると、アプリケーション部110がMAC制御部107に通信終了の通知を渡す。これにより、MAC制御部107は、電源制御部103に無線通信部102の電源切断の要求を行う。 In addition, when communication of the connected application is disconnected, the application unit 110 passes a communication end notification to the MAC control unit 107. As a result, the MAC control unit 107 requests the power supply control unit 103 to power off the wireless communication unit 102.
 次に、通信端末装置100のパワーセーブモード受信時の動作について説明する。 Next, the operation of the communication terminal device 100 when receiving the power save mode will be described.
 図4は、通信端末装置100のパワーセーブモード受信時の動作を示すフローチャートである。図中、Sはフローの各ステップを示す。 FIG. 4 is a flowchart showing the operation of the communication terminal apparatus 100 when receiving the power save mode. In the figure, S indicates each step of the flow.
 まず、ステップS11でMAC制御部107はDTIM周期で電源制御部103を制御することで、無線通信部102の電源を供給し、Awake状態に遷移しBeaconを受信する。 First, in step S11, the MAC control unit 107 controls the power supply control unit 103 in the DTIM cycle to supply power to the wireless communication unit 102, transition to the awake state, and receive a beacon.
 ステップS12では、MAC制御部107は無線通信部102より渡されたBeacon情報を解析することで、自局宛データがAPにバッファされているかを確認する。自局宛データが無い場合には、MAC制御部107は、電源制御部103を制御し、無線通信部102の電源を切断し、次のDTIMタイミングまでDoze状態に遷移する。 In step S12, the MAC control unit 107 analyzes the Beacon information passed from the wireless communication unit 102 to confirm whether the data addressed to itself is buffered in the AP. When there is no data addressed to the own station, the MAC control unit 107 controls the power supply control unit 103 to turn off the power of the wireless communication unit 102 and transitions to the Doze state until the next DTIM timing.
 上記ステップS12で自局宛データがある場合には、ステップS13でMAC制御部107はPS-Pollを無線通信部102に渡し送信する。無線通信部102は、PS-Pollにより引き出された受信データをトラフィック監視部104とMAC制御部107に渡す。 If there is data addressed to the own station in step S12, the MAC control unit 107 passes PS-Poll to the wireless communication unit 102 and transmits it in step S13. The wireless communication unit 102 passes the received data extracted by PS-Poll to the traffic monitoring unit 104 and the MAC control unit 107.
 ステップS14では、トラフィック監視部104は受信データが渡されると、受信データ数をカウントし、データ間隔を測定する。 In step S14, when the received data is passed, the traffic monitoring unit 104 counts the number of received data and measures the data interval.
 ステップS15では、MAC制御部107はPS-Pollにより引き出された受信データを無線通信部102から受けると、ACKを送信するとともに受信データよりAPに自局宛データがまだバッファされているかを確認する。自局宛データがまだバッファされている場合には、ステップS13に戻り再度PS-Pollを送信しバッファされているデータを引き続き受信し、自局宛データのバッファがなくなるまで繰り返す。 In step S15, when receiving the reception data extracted by PS-Poll from the wireless communication unit 102, the MAC control unit 107 transmits an ACK and confirms whether the data addressed to the own station is still buffered in the AP from the reception data. . If the data addressed to the own station is still buffered, the process returns to step S13 to transmit the PS-Poll again, continue to receive the buffered data, and repeat until there is no buffer for the data addressed to the own station.
 APにバッファされているデータがなくなった時点で、ステップS16でMAC制御部107は電源制御部103を制御して無線通信部102の電源を切断し、Doze状態に遷移する。また、MAC制御部107はトラフィック監視部104にトラフィック終了の通知を出す。これにより、ステップS17でトラフィック監視部104は測定を終了し、測定した受信間隔をパワーセーブ時受信間隔112に、カウントされた受信データ数を受信データ数113に、RSSI等の回線状態を回線品質114としてメモリ108に格納する。 When there is no more data buffered in the AP, in step S16, the MAC control unit 107 controls the power supply control unit 103 to turn off the wireless communication unit 102, and transitions to the Doze state. In addition, the MAC control unit 107 notifies the traffic monitoring unit 104 of the end of traffic. As a result, the traffic monitoring unit 104 ends the measurement in step S17, the measured reception interval is the power save reception interval 112, the counted received data number is the received data number 113, and the line state such as RSSI is the line quality. 114 is stored in the memory 108.
 またMAC制御部107は、トラフィック監視部104よりトラフィック情報更新終了の通知を受けると、受信モード決定部109に受信モードの選択の要求を行う。 Further, when the MAC control unit 107 receives a notification of traffic information update completion from the traffic monitoring unit 104, the MAC control unit 107 requests the reception mode determination unit 109 to select a reception mode.
 ステップS18では、受信モード決定部109はメモリ108を参照し、各受信モードにおける受信間隔、受信データ数及びタイマ値により、無線通信部102の電源切断時間がより短い受信モードを決定し、MAC制御部107へ通知して本フローを終了する。 In step S18, the reception mode determination unit 109 refers to the memory 108, determines a reception mode in which the power-off time of the wireless communication unit 102 is shorter, based on the reception interval, the number of received data, and the timer value in each reception mode, and performs MAC control. The notification is sent to the unit 107 and this flow ends.
 次に、通信端末装置100のアクティブモード受信時の動作について説明する。 Next, the operation of the communication terminal device 100 when receiving the active mode will be described.
 図5は、通信端末装置100のアクティブモード受信時の動作を示すフローチャートである。 FIG. 5 is a flowchart showing the operation of the communication terminal apparatus 100 when receiving the active mode.
 まず、ステップS21でMAC制御部107はDTIM周期で電源制御部103を制御することで、無線通信部102の電源を供給し、Awake状態に遷移しBeaconを受信する。 First, in step S21, the MAC control unit 107 controls the power supply control unit 103 in the DTIM cycle to supply power to the wireless communication unit 102, transit to the awake state, and receive a beacon.
 ステップS22では、MAC制御部107は無線通信部102より渡されたBeacon情報解析することで、自局宛データがAPにバッファされているかを確認する。自局宛データが無い場合には、MAC制御部107は、電源制御部103を制御し、無線通信部102の電源を切断し、次のDTIMタイミングまでDoze状態に遷移する。 In step S22, the MAC control unit 107 analyzes the Beacon information passed from the wireless communication unit 102 to confirm whether the data addressed to itself is buffered in the AP. When there is no data addressed to the own station, the MAC control unit 107 controls the power supply control unit 103 to turn off the power of the wireless communication unit 102 and transitions to the Doze state until the next DTIM timing.
 上記ステップS22で自局宛データがある場合には、ステップS23でMAC制御部107はAPにパワーセーブの解除を通知するためのNULLパケットを無線通信部102に渡し送信しアクティブモードとなる。次いで、ステップS24でまたMAC制御部107はタイマ制御部106にタイマカウントの開始を要求する。 If there is data addressed to the own station in step S22, in step S23, the MAC control unit 107 transmits a NULL packet for notifying the AP of cancellation of power saving to the wireless communication unit 102 and enters the active mode. Next, in step S24, the MAC control unit 107 requests the timer control unit 106 to start the timer count.
 ステップS25では、MAC制御部107はAwake状態でデータが受信されるか、又はタイマ制御部106からタイムアウトが通知されるまで待機する。 In step S25, the MAC control unit 107 waits until data is received in the awake state or a time-out is notified from the timer control unit 106.
 データを受信すると、ステップS26で無線通信部102は受信したデータをトラフィック監視部104とMAC制御部107に渡す。トラフィック監視部104では、受信データが渡されると、受信データ数をカウントし、データ間隔を測定する。MAC制御部107は無線通信部102より受信データを受けるとACKを送信するとともに、タイマカウントをクリアし新たにタイマカウント開始をタイマ制御部106に要求する(ステップS26からステップS24へ戻る)。 When the data is received, the wireless communication unit 102 passes the received data to the traffic monitoring unit 104 and the MAC control unit 107 in step S26. When the received data is passed, the traffic monitoring unit 104 counts the number of received data and measures the data interval. When receiving the received data from the wireless communication unit 102, the MAC control unit 107 transmits ACK, clears the timer count, and newly requests the timer control unit 106 to start the timer count (return from step S26 to step S24).
 一定時間受信データがなく、MAC制御部107においてタイマ制御部106よりタイムアウトの通知を受けた場合には(ステップS27)、ステップS28でMAC制御部107はパワーセーブモード移行をAPに通知するためのNULLパケットを送信し、パワーセーブモードに遷移する。次いで、ステップS29でMAC制御部107は電源制御部103を制御して無線通信部102の電源を切断し、Doze状態に遷移する。 When there is no reception data for a certain period of time and the MAC control unit 107 receives a timeout notification from the timer control unit 106 (step S27), the MAC control unit 107 notifies the AP of the power save mode transition in step S28. A NULL packet is transmitted, and a transition is made to the power save mode. Next, in step S29, the MAC control unit 107 controls the power supply control unit 103 to turn off the wireless communication unit 102, and transitions to the Doze state.
 ステップS30では、MAC制御部107はトラフィック監視部104にトラフィック終了の通知を出すことで、トラフィック監視部104は測定を終了し、測定した受信間隔をアクティブモード時受信間隔111に、カウントされた受信データ数を受信データ数113に、RSSI等の回線状態を回線品質114としてメモリ108に格納する。 In step S30, the MAC control unit 107 notifies the traffic monitoring unit 104 of the end of traffic, so that the traffic monitoring unit 104 ends the measurement, and the received reception counted as the reception interval 111 in the active mode is the measured reception interval. The number of data is stored in the memory 108 as the number of received data 113, and the line state such as RSSI is stored as the line quality 114.
 トラフィック終了通知を受けたトラフィック監視部104は、タイマの更新をタイマ決定部105に通知する。ステップS31でタイマ更新通知を受けたタイマ決定部105は、メモリ108を参照し、アクティブモード時受信間隔111と回線品質114の情報に基づき、タイマ値を算出する。算出したタイマ値はメモリ108のタイマ値115に格納するとともに、タイマ制御部106に渡される。 Upon receiving the traffic end notification, the traffic monitoring unit 104 notifies the timer determination unit 105 of the timer update. Upon receiving the timer update notification in step S31, the timer determination unit 105 refers to the memory 108 and calculates a timer value based on the information on the active mode reception interval 111 and the line quality 114. The calculated timer value is stored in the timer value 115 of the memory 108 and passed to the timer control unit 106.
 またMAC制御部107は、トラフィック監視部104よりトラフィック情報更新終了の通知を受けると、受信モード決定部109に受信モードの選択の要求を行う。 Further, when the MAC control unit 107 receives a notification of traffic information update completion from the traffic monitoring unit 104, the MAC control unit 107 requests the reception mode determination unit 109 to select a reception mode.
 ステップS32では、受信モード決定部109はメモリ108を参照し、各受信モードにおける受信間隔、受信データ数及びタイマ値により、無線通信部102の電源切断時間がより短い受信モードを決定し、MAC制御部107へ通知して本フローを終了する。 In step S32, the reception mode determination unit 109 refers to the memory 108, determines a reception mode with a shorter power-off time of the wireless communication unit 102 based on the reception interval, the number of received data, and the timer value in each reception mode, and performs MAC control. The notification is sent to the unit 107 and this flow ends.
 次に、受信モード決定部109における受信モードの設定方法について詳細に説明する。 Next, a reception mode setting method in the reception mode determination unit 109 will be described in detail.
 図6は、通信端末装置100の受信モード選択時の動作を示すフローチャートである。 FIG. 6 is a flowchart showing the operation of the communication terminal device 100 when the reception mode is selected.
 まず、ステップS41でパワーセーブモード時においてデータバッファ無しの通知を受ける、もしくは、アクティブモード時においてタイムアウトした場合に、MAC制御部107は受信モード決定部109に次のBeaconのWakeUP時における受信モードの決定を受信モード決定部に要求する。 First, in step S41, when receiving a notification that there is no data buffer in the power save mode or when a timeout occurs in the active mode, the MAC control unit 107 informs the reception mode determination unit 109 of the reception mode at the next Beacon WakeUP. Request the determination to the reception mode determination unit.
 ステップS42では、要求を受けた受信モード決定部109はメモリ109からアクティブモード受信時間隔111、パワーセーブモード時受信間隔112、受信データ数113、タイマ値115を参照する。 In step S42, the reception mode determination unit 109 that has received the request refers to the active mode reception interval 111, the power save mode reception interval 112, the reception data number 113, and the timer value 115 from the memory 109.
 ステップS43では、受信モード決定部109はアクティブモード受信時間隔111とパワーセーブモード受信間隔112にデータが保持されているかを確認する。WLANの電源を立ち上げ、始めに通信を行った場合には、まずパワーセーブモードにて受信を行うため、アクティブモード時受信間隔111には何も保持されていない。パワーセーブモード時の受信間隔とアクティブモード時の受信間隔は、環境が同じであるならば、必ず後者の方が短くなると考えられる。よって、ステップS44で受信モード決定部109は受信データ数とあらかじめ設定した閾値を比較し、その結果によりどちらのモードが有利であるかを判断する。ここでの閾値は例えば10個などの値である。 In step S43, the reception mode determination unit 109 confirms whether data is held in the active mode reception interval 111 and the power save mode reception interval 112. When the WLAN power supply is turned on and communication is performed first, since reception is first performed in the power save mode, nothing is held in the reception interval 111 in the active mode. If the reception interval in the power save mode and the reception interval in the active mode are the same, it is considered that the latter is always shorter. Therefore, in step S44, the reception mode determination unit 109 compares the number of received data with a preset threshold value, and determines which mode is advantageous based on the result. The threshold value here is, for example, 10 values.
 上記ステップS43において、各受信モード時の受信間隔が保持されていた場合には、ステップS45で受信モード決定部109は参照データによりアクティブモード時のAwake時間とパワーセーブモード時のAwake時間を見積もり、どちらのモードのAwake時間が長いかを比較する。ここでの比較方法として、例えば以下の式(1)(2)により各モードにおけるAwake時間を算出する。 In step S43, when the reception interval in each reception mode is held, in step S45, the reception mode determination unit 109 estimates the awake time in the active mode and the awake time in the power save mode from the reference data, Compare which mode has a longer awake time. As a comparison method here, for example, the awake time in each mode is calculated by the following equations (1) and (2).
 アクティブモード時Awake時間 =アクティブモード時受信間隔111×受信データ数113+タイマ値115  …(1)
 パワーセーブモード時Awake時間=パワーセーブモード時受信間隔112×受信データ数113  …(2)
 上記式(1)(2)の結果を比較し、受信時間が短いモードを選択する。
Awake time in active mode = reception interval 111 in active mode × number of received data 113 + timer value 115 (1)
Awake time in power save mode = reception interval 112 in power save mode x number of received data 113 (2)
The results of the above formulas (1) and (2) are compared, and a mode with a short reception time is selected.
 上記ステップS44で受信データ数が閾値以上のとき、あるいは、上記ステップS45でアクティブモード時のAwake時間が短い(Active≦PS)と判断された場合には、ステップS46で受信モード決定部109はMAC制御部107に、次のBeaconタイミングにアクティブモードで受信するように要求する。 When the number of received data is greater than or equal to the threshold value in step S44 or when it is determined in step S45 that the awake time in the active mode is short (Active ≦ PS), in step S46, the reception mode determination unit 109 The control unit 107 is requested to receive in the active mode at the next Beacon timing.
 また、上記ステップS44で受信データ数が閾値未満のとき、あるいは、上記ステップS45でパワーセーブモード時のAwake時間が短い(Active>PS)と判断された場合には、ステップS47で受信モード決定部109はMAC制御部107に、次のBeaconタイミングにパワーセーブモードで受信するように要求する。 If the number of received data is less than the threshold value in step S44, or if it is determined in step S45 that the awake time in the power save mode is short (Active> PS), a reception mode determination unit in step S47. 109 requests the MAC control unit 107 to receive in the power save mode at the next Beacon timing.
 ステップS48では、受信モード決定部109より、次のBeaconタイミング時の受信モードの通知を受けたMAC制御部107は、通知されたモードに従い受信動作を行って本フローを終了する。 In step S48, the MAC control unit 107 that has received the notification of the reception mode at the next Beacon timing from the reception mode determination unit 109 performs a reception operation according to the notified mode, and ends this flow.
 次に、タイマ決定部105におけるタイマの決定方法について詳細に説明する。 Next, a timer determination method in the timer determination unit 105 will be described in detail.
 図7は、タイマ決定部105のタイマ値を算出する動作を示すフローチャートである。 FIG. 7 is a flowchart showing an operation of calculating the timer value of the timer determination unit 105.
 まず、ステップS51でトラフィック監視部104がMAC制御部107からトラフィック修了通知を受けると、トラフィック監視部104はタイマ決定部105にタイマ決定要求を通知する。 First, when the traffic monitoring unit 104 receives a traffic completion notification from the MAC control unit 107 in step S51, the traffic monitoring unit 104 notifies the timer determination unit 105 of a timer determination request.
 ステップS52では、要求を受けたタイマ決定部105はメモリ108からトラフィック情報であるアクティブモード受信時間隔111を参照する。 In step S52, the timer determination unit 105 that has received the request refers to the active mode reception time interval 111 that is traffic information from the memory.
 ステップS53は、タイマ決定部105は取得したアクティブモード時受信間隔111の平均値を算出し、タイマとして設定する。設定したタイマは、メモリ108のタイマ値115に保持するとともに、タイマ制御部106へ渡される。 In step S53, the timer determination unit 105 calculates the average value of the acquired reception intervals 111 in the active mode and sets it as a timer. The set timer is held in the timer value 115 of the memory 108 and is passed to the timer control unit 106.
 ステップS54では、タイマ制御部106はタイマ決定部105から渡されたタイマ値を用い、MAC制御部107からタイマカウント開始の要求を受けたときに、タイマをカウントする。これにより決められたタイマが反映される。MAC制御部107で通知された受信モードで動作することになる。 In step S54, the timer control unit 106 uses the timer value passed from the timer determination unit 105 and counts the timer when receiving a timer count start request from the MAC control unit 107. As a result, the determined timer is reflected. The operation is performed in the reception mode notified by the MAC control unit 107.
 ここで、上記ステップS53におけるアクティブモード時受信間隔111からのタイマ設定については、平均値算出は例示的なものであり、限定されるものではない。例えば、平均値算出に代えて、指定個数パケットの最大値や、パケット間隔の分散値特性おいて指定パケット数が分布する値等、他の具体的な方法により実施可能である。 Here, regarding the timer setting from the reception interval 111 in the active mode in the above step S53, the average value calculation is illustrative and is not limited. For example, instead of calculating the average value, it can be carried out by other specific methods such as a maximum value of the designated number of packets and a value in which the designated number of packets is distributed in the dispersion value characteristic of the packet interval.
 次に、タイマ決定部105がタイマ決定を行う他の例について説明する。 Next, another example in which the timer determination unit 105 determines a timer will be described.
 図8は、タイマ決定部105のタイマ値を設定する動作を示すフローチャートである。 FIG. 8 is a flowchart showing the operation of setting the timer value of the timer determination unit 105.
 まず、ステップS61でトラフィック監視部104は、MAC制御部107がタイムアウト通知をタイマ制御部106から受ける、もしくはパワーセーブモード時に自局宛データ無しの通知を受けた場合に送信する、受信トラフィック終了の通知がされたか否かを確認する。 First, in step S61, the traffic monitoring unit 104 receives the timeout notification from the timer control unit 106 by the MAC control unit 107, or transmits the received traffic end notification in the power save mode. Check whether notification has been made.
 受信トラフィック終了の通知が無い場合は、ステップS62でトラフィック監視部104は受信されるデータの伝送速度を確認する。これは、伝送速度が低下もしくは上昇した場合は、その伝送速度に応じた受信間隔に合わせて、タイマを最適化するためである。 If there is no notification of the end of received traffic, the traffic monitoring unit 104 confirms the transmission speed of the received data in step S62. This is because when the transmission rate decreases or increases, the timer is optimized in accordance with the reception interval corresponding to the transmission rate.
 また、伝送速度が変化しなくても、ステップS63でトラフィック監視部104はRSSIやSNR(Signal power to Noise power Ratio)の受信特性の値を確認する。これは、RSSIやSNRが低下した場合には、受信特性の劣化から再送等が生じるため、その分受信間隔が変動することが想定されるためである。よって、それに合わせてタイマを最適化する必要がある。RSSIやSNRの受信特性の低下があればステップS64に進み、RSSIやSNRの受信特性の低下がなければ上記ステップS61に戻る。 Even if the transmission rate does not change, in step S63, the traffic monitoring unit 104 checks the value of the reception characteristic of RSSI or SNR (Signal power to Noise で power Ratio). This is because when the RSSI or SNR decreases, retransmission or the like occurs due to the deterioration of the reception characteristics, and therefore the reception interval is assumed to fluctuate accordingly. Therefore, it is necessary to optimize the timer accordingly. If there is a decrease in RSSI or SNR reception characteristics, the process proceeds to step S64, and if there is no decrease in RSSI or SNR reception characteristics, the process returns to step S61.
 各ステップS61~ステップS63において、タイマ設定トリガが検出された場合には、ステップS64でトラフィック監視部104はタイマ決定部105にタイマの設定要求を行う。 In each step S61 to step S63, if a timer setting trigger is detected, the traffic monitoring unit 104 makes a timer setting request to the timer determining unit 105 in step S64.
 次に、アプリケーション部110の要求に従い、受信モードを選択する場合の動作について説明する。 Next, the operation when the reception mode is selected according to the request of the application unit 110 will be described.
 図9は、アプリケーション部110の通知による受信方法選択を示すフローチャートである。 FIG. 9 is a flowchart showing reception method selection based on notification from the application unit 110.
 ステップS71でMAC制御部107はHTTP GETのようなダウンロードの要求を受ける。アプリケーション部110によりHTTP GETのようなダウンロードの要求がMAC制御部107に通知された場合は、アクティブモードにおける受信方法が効率よくデータを取得可能であるため、アクティブモードによる受信方法を選択する。そこで、ステップS72でMAC制御部107はタイマ制御部106にタイマカウントの要求を行う。 In step S71, the MAC control unit 107 receives a download request such as HTTP GET. When a download request such as HTTP GET is notified to the MAC control unit 107 by the application unit 110, the reception method in the active mode can efficiently acquire data, and therefore the reception method in the active mode is selected. Therefore, in step S72, the MAC control unit 107 requests the timer control unit 106 for timer count.
 次いで、ステップS73でMAC制御部107は、APにパワーセーブ解除要求を送信し、アクティブモードによる受信を開始して本フローを終了する。 Next, in step S73, the MAC control unit 107 transmits a power save cancellation request to the AP, starts reception in the active mode, and ends this flow.
 以上詳細に説明したように、本実施の形態によれば、トラフィック監視部104は、受信データのパケット間隔及び受信データ数をモニタし、タイマ決定部105は、保持された受信データのパケット間隔に基づいて、アクティブモードのAwake状態からパワーセーブモードに移行しDoze状態に遷移するタイマ制御部106のタイマのタイマ値を設定する。例えば、タイマ決定部105は、一定時間トラフィックが無い場合に、Doze状態に遷移するタイマ時間を設定する。受信モード決定部109は、各モードにおける受信間隔及び受信データ数と、アクティブモードにおけるタイマの計時に基づいて、WLANCHIP(デバイス)のAwake状態がより短くなる受信モードを選択し、通信端末装置100はそのモードで受信を行うことができる。上記構成により、通信端末装置100が受信データの伝送速度によるデータ間隔や再送等を含めた回線状態によってアクティブモードにおけるタイマを設定することで、受信データ間隔よりタイマが短くなることによるスループットの低下や、タイマが長くなることで新規にネットワークから送信されるデータを取り続けることによる電力消費を抑えるとともに、受信パケット数とタイマ値によりデバイスのAwake状態が最小となるように受信モードを切り替えることで、最適な受信を行うことができる。 As described above in detail, according to the present embodiment, the traffic monitoring unit 104 monitors the packet interval of received data and the number of received data, and the timer determining unit 105 sets the received packet interval of received data. Based on the Awake state in the active mode, the timer value of the timer of the timer control unit 106 that shifts to the power save mode and transitions to the Doze state is set. For example, the timer determination unit 105 sets a timer time for transition to the Doze state when there is no traffic for a certain period of time. The reception mode determination unit 109 selects a reception mode in which the awake state of the WLANCHIP (device) is shorter based on the reception interval and the number of reception data in each mode and the timer of the active mode, and the communication terminal apparatus 100 Reception can be performed in that mode. With the above configuration, the communication terminal device 100 sets the timer in the active mode according to the line state including the data interval and the retransmission according to the transmission rate of the received data, thereby reducing the throughput due to the timer becoming shorter than the reception data interval. Optimal by switching the reception mode so that the device's Awake state is minimized according to the number of received packets and the timer value, while suppressing the power consumption by continuously taking data transmitted from the network as the timer becomes longer Can be received.
 また、無線LAN搭載端末のレガシーパワーセーブにおいて端末が受信をする場合は、受信データと同数のPS-Pollの送信が必要であり、そのPS-Pollの送信で電力や帯域を使用するため、受信データ数によっては非効率となる場合がある。しかし、アクティブモードによる受信においては、Doze状態に遷移する契機に取り決めがないため、タイマを適宜設定せねばならない。これに対して、本実施の形態では、通信端末装置100は、受信データの間隔や無線状態に基づいて、アクティブモードにおける受信時のAwake状態からパワーセーブモードのDoze状態に移るタイマを適宜設定する。また、各受信モードにおける受信データの間隔を保持し、受信データ数とそのタイマ時間とによりAwake時間を最小となるように受信モードを選択し、Beacon毎のタイミングで切り替えることで、WLAN搭載端末における受信時のエネルギ消費を最適化することができる。 In addition, when a terminal receives data in legacy power saving of a wireless LAN-equipped terminal, it is necessary to transmit the same number of PS-Polls as the received data, and power and bandwidth are used for the transmission of the PS-Poll. Depending on the number of data, it may be inefficient. However, in the reception in the active mode, since there is no agreement on the transition to the Doze state, the timer must be set appropriately. On the other hand, in the present embodiment, communication terminal apparatus 100 appropriately sets a timer for shifting from the Awake state at the time of reception in the active mode to the Doze state in the power save mode based on the interval of received data and the wireless state. . In addition, in the WLAN-equipped terminal, the reception data interval in each reception mode is held, the reception mode is selected so as to minimize the awake time based on the number of reception data and the timer time, and the timing is changed for each beacon. Energy consumption during reception can be optimized.
 以上の説明は本発明の好適な実施の形態の例証であり、本発明の範囲はこれに限定されることはない。例えば、システム構成や各デバイスの構成を限定するものではない。 The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this. For example, the system configuration and the configuration of each device are not limited.
 また、トラフィック監視部104は、受信データのパケット間隔、データ数及びRSSIや伝送速度等の回線品質をモニタする。無線状態は、上述のWLANのビーコン又は受信パケットのRSSIやSNR、スループットのほか、例えばWLANの送信パケットのPER(Packet Error Rate)や廃棄パケット数、WLANのパケットの再送実施回数やACK、無線LANの通信レイト、WLANのビーコン間隔、無線LANのDTIM周期、TCP(Transmission Control Protocol)のウインドウサイズにより取得できる。 In addition, the traffic monitoring unit 104 monitors packet quality of received data, the number of data, and line quality such as RSSI and transmission speed. The wireless state includes the above-described WLAN beacon or RSSI, SNR, and throughput of the received packet, for example, the PER (Packet Error Rate) of the WLAN transmission packet, the number of discarded packets, the number of times the WLAN packet is retransmitted, ACK, wireless LAN The communication rate, the beacon interval of WLAN, the DTIM cycle of wireless LAN, and the window size of TCP (TransmissionTransControl Protocol).
 また、本実施の形態では、通信端末装置、WLAN搭載無線端末局及びモード切替制御方法という名称を用いたが、これは説明の便宜上であり、無線端末装置、無線通信システム、受信モード切替え方法等であってもよいことは勿論である。 In the present embodiment, the names of a communication terminal device, a WLAN-equipped wireless terminal station, and a mode switching control method are used. However, this is for convenience of explanation, and a wireless terminal device, a wireless communication system, a reception mode switching method, etc. Of course, it may be.
 さらに、上記通信端末装置及び受信方法を構成する各部、例えばMAC制御部の種類、その数及び接続方法などはどのようなものでもよい。 Furthermore, any part of the communication terminal device and the reception method, for example, the type, number and connection method of the MAC control unit may be used.
 以上説明した通信端末装置の受信方法は、この受信方法を機能させるためのプログラムでも実現される。このプログラムはコンピュータで読み取り可能な記録媒体に格納されている。 The reception method of the communication terminal apparatus described above is also realized by a program for causing this reception method to function. This program is stored in a computer-readable recording medium.
 2008年2月27日出願の特願2008-046415の日本出願に含まれる明細書、図面及び要約書の開示内容は、すべて本願に援用される。 The disclosure of the specification, drawings, and abstract contained in the Japanese application of Japanese Patent Application No. 2008-046415 filed on Feb. 27, 2008 is incorporated herein by reference.
 本発明に係る通信端末装置及び受信方法は、無線LANを構成する通信端末装置と無線基地局とが接続された無線通信システムに幅広く適用することができる。また、ノート型パーソナルコンピュータ、PDA等の無線通信機能をもつ携帯の容易な電子機器に広く適用することができる。 The communication terminal apparatus and reception method according to the present invention can be widely applied to a wireless communication system in which a communication terminal apparatus constituting a wireless LAN and a wireless base station are connected. In addition, the present invention can be widely applied to portable electronic devices having a wireless communication function such as notebook personal computers and PDAs.

Claims (18)

  1.  アクティブモードと、PS-Pollによるポーリング処理に基づくパワーセーブモードとを有する通信端末装置であって、
     受信トラフィックを監視し、受信データのパケット間隔及び受信データ数を保持する受信トラフィック監視手段と、
     保持された受信データのパケット間隔に基づいて、アクティブモードのAwake状態からパワーセーブモードに移行しDoze状態に遷移するタイマのタイマ値を設定する制御手段と、
     各モードにおける受信間隔及び受信データ数と、アクティブモードにおける前記タイマの計時に基づいて、モードを切り替える受信モード決定手段と、
     を備える通信端末装置。
    A communication terminal apparatus having an active mode and a power save mode based on a polling process by PS-Poll,
    Received traffic monitoring means for monitoring received traffic and holding the received data packet interval and the number of received data;
    Control means for setting a timer value of a timer that shifts from the Awake state in the active mode to the power save mode and transitions to the Doze state based on the held packet interval of the received data;
    A reception mode determining means for switching modes based on the reception interval and the number of received data in each mode, and the time measurement of the timer in the active mode;
    A communication terminal device comprising:
  2.  前記制御手段は、一定時間受信トラフィックが無い場合に、前記タイマのタイマ値を設定する請求項1記載の通信端末装置。 The communication terminal apparatus according to claim 1, wherein the control means sets a timer value of the timer when there is no received traffic for a certain period of time.
  3.  前記受信トラフィック監視手段は、アクティブモード時において一定時間受信トラフィックを監視することにより、受信データのパケット間隔を保持し、
     前記制御手段は、保持された受信データのパケット間隔を基に前記タイマのタイマ値を設定する請求項1記載の通信端末装置。
    The received traffic monitoring means maintains the packet interval of received data by monitoring the received traffic for a certain period of time in the active mode,
    The communication terminal apparatus according to claim 1, wherein the control means sets a timer value of the timer based on a held packet interval of received data.
  4.  前記受信トラフィック監視手段は、伝送速度を監視し、
     前記制御手段は、前記伝送速度が変わったときには前記タイマを再設定する請求項1記載の通信端末装置。
    The received traffic monitoring means monitors a transmission rate,
    The communication terminal apparatus according to claim 1, wherein the control unit resets the timer when the transmission rate is changed.
  5.  前記受信トラフィック監視手段は、該当端末装置宛のデータ及びBeaconのRSSI又はSNRを基に回線状態を監視し、
     前記制御手段は、前記回線状態の特性が劣化するときには前記タイマを再設定する請求項1記載の通信端末装置。
    The received traffic monitoring means monitors the line state based on the data addressed to the terminal device and the Beacon RSSI or SNR,
    The communication terminal apparatus according to claim 1, wherein the control unit resets the timer when the characteristics of the line state deteriorate.
  6.  前記受信モード決定手段は、各モードにおける受信データパケットの間隔と該当端末装置宛の受信パケット数を基に、Awake状態にある時間をAwake時間として算出し、該Awake時間が短くなるモードを逐次選択する請求項1記載の通信端末装置。 The reception mode determining means calculates the time in the awake state as an awake time based on the interval of received data packets in each mode and the number of received packets addressed to the corresponding terminal device, and sequentially selects a mode in which the awake time is shortened The communication terminal device according to claim 1.
  7.  前記受信モード決定手段は、モードを選択後、次のBeacon受信タイミングで選択したモードに切り替える請求項1記載の通信端末装置。 The communication terminal apparatus according to claim 1, wherein the reception mode determining means switches to the mode selected at the next Beacon reception timing after selecting the mode.
  8.  前記受信モード決定手段は、各Beacon周期においてモードを切り替える請求項1記載の通信端末装置。 The communication terminal apparatus according to claim 1, wherein the reception mode determination means switches modes in each beacon cycle.
  9.  前記受信モード決定手段は、アプリケーション要件によりダウンロードを行うことが通知されると、アクティブモードを選択する請求項1記載の通信端末装置。 The communication terminal apparatus according to claim 1, wherein the reception mode determining means selects the active mode when notified of downloading according to application requirements.
  10.  アクティブモードと、PS-Pollによるポーリング処理に基づくパワーセーブモードとを有する通信端末装置の受信方法であって、
     受信トラフィックを監視し、受信データのパケット間隔及び受信データ数を保持する監視ステップと、
     保持された受信データのパケット間隔に基づいて、アクティブモードのAwake状態からパワーセーブモードに移行しDoze状態に遷移するタイマのタイマ値を設定する制御ステップと、
     各モードにおける受信間隔及び受信データ数と、アクティブモードにおける前記タイマの計時に基づいて、モードを切り替える選択ステップと
     を有する受信方法。
    A reception method for a communication terminal apparatus having an active mode and a power save mode based on a polling process by PS-Poll,
    A monitoring step of monitoring the received traffic and holding the packet interval of received data and the number of received data;
    A control step for setting a timer value of a timer that shifts from the Awake state in the active mode to the power save mode and transitions to the Doze state based on the held packet interval of the received data;
    A reception method comprising: a reception step and a reception data number in each mode; and a selection step of switching modes based on the time of the timer in the active mode.
  11.  前記制御ステップでは、一定時間受信トラフィックが無い場合に、前記タイマのタイマ値を設定する請求項10記載の受信方法。 11. The receiving method according to claim 10, wherein in the control step, the timer value of the timer is set when there is no received traffic for a certain period of time.
  12.  前記監視ステップでは、アクティブモード時において一定時間受信トラフィックを監視することにより、受信データのパケット間隔を保持し、
     前記制御ステップでは、保持された受信データのパケット間隔を基に前記タイマのタイマ値を設定する請求項10記載の受信方法。
    In the monitoring step, the received data packet interval is maintained by monitoring the received traffic for a certain period of time in the active mode,
    The receiving method according to claim 10, wherein in the control step, a timer value of the timer is set based on a held packet interval of received data.
  13.  前記監視ステップでは、伝送速度を監視し、
     前記制御ステップでは、前記伝送速度が変わったときには前記タイマを再設定する請求項10記載の受信方法。
    In the monitoring step, the transmission rate is monitored,
    The receiving method according to claim 10, wherein, in the control step, the timer is reset when the transmission rate is changed.
  14.  前記監視ステップでは、該当端末装置宛のデータ及びBeaconのRSSI又はSNRを基に回線状態を監視し、
     前記制御ステップでは、前記回線状態の特性が劣化するときには前記タイマを再設定する請求項10記載の受信方法。
    In the monitoring step, the line status is monitored based on the data addressed to the corresponding terminal device and the Beacon RSSI or SNR,
    The receiving method according to claim 10, wherein in the control step, the timer is reset when the characteristics of the line state deteriorate.
  15.  前記選択ステップでは、各モードにおける受信データパケットの間隔と該当端末装置宛の受信パケット数を基に、Awake状態にあるAwake時間を算出し、該Awake時間が短くなるモードを逐次選択する請求項10記載の受信方法。 11. The selection step calculates an awake time in an awake state based on an interval of received data packets in each mode and the number of received packets addressed to the terminal device, and sequentially selects a mode in which the awake time is shortened. The receiving method described.
  16.  前記選択ステップでは、モードを選択後、次のBeacon受信タイミングで選択したモードに切り替える請求項10記載の受信方法。 11. The reception method according to claim 10, wherein, in the selection step, after the mode is selected, the mode is switched to the mode selected at the next Beacon reception timing.
  17.  前記選択ステップでは、各Beacon周期においてモードを切り替える請求項10記載の受信方法。 The receiving method according to claim 10, wherein in the selection step, the mode is switched in each Beacon cycle.
  18.  前記選択ステップでは、アプリケーション要件によりダウンロードを行うことが通知されると、アクティブモードを選択する請求項10記載の受信方法。
     
    The receiving method according to claim 10, wherein, in the selection step, the active mode is selected when it is notified that the download is performed according to the application requirement.
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