WO2009107180A1 - Dispositif de terminal de communication et procédé de réception - Google Patents

Dispositif de terminal de communication et procédé de réception 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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Prior art keywords
mode
timer
reception
received data
communication terminal
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PCT/JP2008/003727
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English (en)
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/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power 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
    • H04W52/0232—Power 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
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing 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.

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

Abstract

L'invention porte sur un dispositif de terminal de communication et sur un procédé de réception selon lequel la commutation entre un mode actif et un mode d'économie d'énergie peut être optimisée pour favoriser une réception optimale et l'économie d'énergie. Une section de surveillance de trafic (104) d'un dispositif de terminal de communication (100) surveille l'intervalle de paquets des données reçues et le nombre de données reçues. Une section de détermination de temporisateur (105) règle la valeur de temporisateur du temporisateur d'une section de commande de temporisateur (106), qui passe de l'état réveillé du mode actif au mode d'économie d'énergie et transite vers l'état au repos sur la base de l'intervalle de paquets des données reçues conservées. Par exemple, s'il n'y a pas de trafic pendant une certaine période de temps, la section de détermination de temporisateur (105) règle un temps de temporisateur afin qu'il transite vers l'état au repos. Une section de détermination de mode de réception (109) sélectionne un mode de réception dans lequel l'état réveillé de WLANCHIP (dispositif) devient plus court sur la base des intervalles de réception et du nombre de données reçues dans les modes et de la temporisation du temporisateur dans le mode actif.
PCT/JP2008/003727 2008-02-27 2008-12-11 Dispositif de terminal de communication et procédé de réception WO2009107180A1 (fr)

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JP2008-046415 2008-02-27
JP2008046415A JP2009206762A (ja) 2008-02-27 2008-02-27 通信端末装置及び受信方法

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CN103796228B (zh) * 2012-10-31 2018-09-11 中兴通讯股份有限公司 一种无线网络毛细管道性能评估方法及装置
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