JP2007288639A - Method, system and device for controlling communication quality of power saving wireless lan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method, system and device for controlling communication quality of a power saving wireless LAN which maintains an effect of power saving control and multicast communication quality. <P>SOLUTION: An AP sends broadcast data [1-1-11], [1-1-12] and [1-1-13] only after transmission of beacon signals with a delivery traffic display map [1-2-1], [1-2-3] and [1-2-5] in a cycle n-times (n=2 in Fig.) as long as a cycle of transmitting the beacon signals with the delivery traffic display map [1-2-1] to [1-2-5] ([1-1-1] to [1-1-5] are multicast data). An STA 1 operating under the power saving control which does not perform multicast data communication, shares information of the n-time cycle with the AP, and shifts from a sleep mode to an awake mode at a constant cycle which meets conditions to receive the beacon signals with the delivery traffic display map [1-2-1], [1-2-3] and [1-2-5] transmitted in the n-time cycle with certainty. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a radio base station having means for improving a power saving effect for a radio terminal that does not receive multicast data in a radio packet communication system in which a radio terminal operating with at least one power save control exists. The present invention relates to a power-saving wireless LAN communication quality control method and system for a station and a wireless terminal subordinate thereto, and an apparatus therefor.

  Generally, a wireless packet communication system is applied in a form using a wireless system as a part of a wired network (NW) when configuring an overall communication network. That is, a wireless packet communication system is wired to the NW interface at one end of the wired NW, and communication between the wireless terminal and the wired terminal or the wireless terminal is performed by wireless connection.

  In a wireless LAN communication system compliant with the conventional IEEE 802.11 standard (Non-Patent Document 1), a wireless terminal (STA) operating in power saving control (PS mode) is connected under the control of a wireless base station (AP). If so, the AP temporarily accumulates data addressed to the PS mode STA reached from the wired NW side. In addition, the AP uses a beacon signal transmitted at a fixed period to notify the STA under the AP of wireless NW information (supported transmission rate, service set type (SSID), etc.). Other main information reported by the beacon signal includes beacon transmission cycle (Beacon Interval) information and a TIM (Traffic Indication Map) information element in the beacon frame shown in FIG. The TIM information element includes intermittent period information (number of intermittent beacons) [2-1] of a beacon signal (DTIM beacon) with a delivery traffic indication map (DTIM) transmitted intermittently during beacon transmission. The counter value until the next DTIM beacon is transmitted (the counter value is reduced every time a beacon is transmitted, and the beacon when it becomes 0 becomes a DTIM beacon) [2-2], It includes information [2-3] obtained by converting the buffered data into a bitmap for each destination. Here, the STA that shifts to the PS mode sets the timing for receiving the beacon signal at the STA based on the information of the Beacon Interval included in the beacon received before the PS mode shift, and is an integer multiple of the set beacon signal transmission cycle ( Alternatively, the state is changed from the sleep mode to the active mode at every beacon period), and buffering information (information [2-3] bitmapped for each destination) is acquired from the received beacon. The sleep mode is a state in which the transmission / reception function is stopped and power consumption is reduced, and the active mode is a state in which the transmission / reception function operates. Each PS mode STA that has been notified that data is buffered in the bitmap information [2-3] for each destination in the TIM information element of the received beacon is in compliance with the IEEE 802.11 standard after receiving the beacon. The data transmission / reception procedure in the specified PS mode is started.

  Normal unicast data communicates between the PS mode STA and the AP according to such a procedure, while the broadcast / multicast data receiving method in the PS mode follows the example of the procedure shown in FIG. 2 STA1 [1-5] and STA2 [1-6] operating in the PS mode, and STA3 [1-10] operating in the active mode [1-13] (operating in the PS mode). STA) not connected is connected to AP [1-7]. STA1 [1-5] is a terminal not participating in the multicast service, receives broadcast data, and does not receive multicast data. When broadcast / multicast data is accumulated, the AP [1-7] transmits a DTIM beacon [1-2-1] transmitted at a cycle [1-4] that is an integral multiple of the transmission cycle [1-3]. ] To [1-2-3] immediately after transmission of multicast data [1-1-1], [1-1-2], [1-1-3] (shown in black in the figure) and broadcast data [ 1-1-11], [1-1-12], and [1-1-13] (shown in white in the figure) are transmitted. The PS mode STA transitions from the sleep mode to the active mode at the timing of receiving the DTIM beacon, and receives broadcast / multicast data. That is, as described above, the PS mode STA sets the period [1-8] and [1-9] for receiving the beacon signal by itself, and sleeps at the set timing [1-11] and [1-12]. In the state transition from the active mode to the active mode, the counter [1] to transmit the DTIM beacon of the TIM information element included in the beacon shown in FIG. 1 and the next DTIM beacon are transmitted. Even at the timing when the DTIM beacon can be surely received based on the information of the value [2-2], the state must be set to satisfy the conditions [1-11] and [1-12]. Even in STA1 [1-5] that does not receive multicast data [1-1-1], [1-1-2], [1-1-3], in order to receive broadcasts, In STA3 [1-10], which must transition from the sleep mode to the active mode and not operating in the PS mode, the STA connected in the PS mode is under the connected AP. If it exists, broadcast / multicast data is received in the period of the DTIM beacon.

  However, in the conventional wireless LAN system, the AP can expect a power saving effect by setting a longer period for transmitting beacons and an intermittent period for transmitting DTIM beacons. In PS mode STA, a power saving effect can be expected by setting a long period for receiving a beacon from an AP (maximum DTIM beacon reception period). However, in PS mode STA, when the beacon reception cycle is set to be long, a large delay time occurs in receiving unicast / multicast data. As a method for solving this problem, U-APSD (Wi-Fi WMM-APSD (WMM Power Save (Non-Patent Document 2)) and IEEE 802.11e standard (IEEE Std802.11e-2005 (Non-Patent Document 3))) In the Unscheduled Automatic Power-Save Delivery method, power is saved for unicast data using a method that does not depend on the beacon period, considering the priority control for each application and the range of delay and fluctuation to maintain the communication quality of the application. A control method is defined. In this method, the STA changes the state from the sleep mode to the active mode in a unique transmission / reception cycle in order to maintain the communication quality for each application, and requests the AP to transmit unicast data addressed to itself.

IEEE Std802.11, 1999 edition, MEDIUM ACCESS CONTROL (MAC) AND PHYSICAL (PHY) SPECIFICATIONS, (7.3.2.6 TIM, 11.2 Power management) WMM Power Save for Mobile and Portable Wi-Fi CERTIFIED Devices, Wi-Fi Alliance December2005, (P7-P12) IEEE Std 802.11e-2005, (11.2 Power management)

  In the conventional wireless LAN system, the AP can expect a power saving effect by setting the beacon transmission cycle and the DTIM beacon intermittent cycle longer. However, since multicast data is transmitted only after transmission of a DTIM beacon, there is a problem that large delay and delay fluctuation occur. For example, when an application that requires high communication quality, such as video (moving image) stream distribution, uses a multicast service, an STA that receives the multicast data may interfere with reproduction of the application due to delay and delay fluctuation ( There is a possibility that a situation in which smooth playback is difficult to occur due to the time taken to display the video due to the time required for buffering may occur. Therefore, in order to solve the problem of delay and fluctuation caused by setting the intermittent period of the DTIM beacon to be long, the AP participates in the multicast service when the DTIM beacon period and the beacon period are set short in advance. For STAs operating in a non-PS mode, there is a problem that the effect of power saving control is reduced because the mode is frequently changed to the active mode. Even when the U-APSD method is used, since broadcast / multicast data is specified to be transmitted after transmission of a DTIM beacon, such a problem has not been solved.

  The present invention has means for changing the broadcast data transmission procedure by the AP and the reception procedure by the STA for solving the above-described problems, thereby realizing the effect of power saving control and maintaining the multicast communication quality. An object is to provide a power-saving wireless LAN communication quality control method and apparatus.

  Of the inventions disclosed in this specification, the outline of typical ones will be briefly described as follows.

  1st invention is comprised from the several radio | wireless terminal device which transmits / receives data by radio | wireless packet communication with a radio base station apparatus, and the one or some said radio | wireless terminal device has a sleep mode which stops the data transmission / reception function, The wireless base station operates in a power saving control that transitions to any state of an awake mode that activates the data transmission / reception function, and the wireless base station transmits a beacon signal at a constant cycle and an intermittent cycle of the beacon signal. Transmitting a beacon signal with a delivery traffic display map, which includes information on the delivery traffic display map in the beacon signal, and transmitting broadcast and multicast data after transmitting the beacon signal with the delivery traffic display map. And the wireless terminal device operating under the power saving control has the delivery traffic The wireless base station apparatus is a power-saving wireless LAN communication quality control method in a wireless packet communication system in which a state transition from the sleep mode to the awake mode is performed at a constant cycle satisfying a condition that a beacon signal with a wake-up display map is surely received. Transmits the broadcast data only after the transmission of the beacon signal with the delivery traffic indication map in the cycle of n times the intermittent cycle (n is an integer of 2 or more), and the radio operating in the power saving control When the terminal device shares the information of the n times period with the radio base station device in advance and does not perform the multicast data communication, the beacon signal with the delivery traffic display map transmitted at the n times period is transmitted. The above-mentioned away from the sleep mode is performed at a fixed period that satisfies the condition for reception. Wherein the transition state in the mode.

  In the prior art, for the PS mode STA, the broadcast and multicast data is transmitted to all STAs immediately after the DTIM beacon set and notified in advance by the AP. STAs that are in AP and PS modes and are not performing multicast data communication differ from the prior art in that they perform transmission / reception control related to both broadcast data at intervals of n times the DTIM beacon set and notified in advance.

  According to a second aspect of the present invention, a wireless base station apparatus includes a plurality of wireless terminal apparatuses that transmit and receive data by wireless packet communication, and one or more of the wireless terminal apparatuses include a sleep mode that stops a data transmission / reception function; The wireless base station operates in a power saving control that transitions to any state of an awake mode that activates the data transmission / reception function, and the wireless base station transmits a beacon signal at a constant cycle and an intermittent cycle of the beacon signal. Transmitting a beacon signal with a delivery traffic display map, which includes information on the delivery traffic display map in the beacon signal, and transmitting broadcast and multicast data after transmitting the beacon signal with the delivery traffic display map. And the wireless terminal device operating under the power saving control has the delivery traffic The wireless base station apparatus is a power-saving wireless LAN communication quality control method in a wireless packet communication system in which a state transition from the sleep mode to the awake mode is performed at a constant cycle satisfying a condition that a beacon signal with a wake-up display map is surely received. Transmits the broadcast data only after the transmission of the beacon signal with the delivery traffic indication map in the cycle of n times the intermittent cycle (n is an integer of 2 or more), and the radio operating in the power saving control The terminal device has a procedure for monitoring the reception cycle of the beacon signal with the delivery traffic display map over a certain period, and has means for detecting the n-fold cycle by the monitoring procedure, and the multicast data communication If not, send in the detected n times period The From the constant cycle delivered traffic display map with the beacon signal can be received always a sleep mode, characterized in that a state transition to the awake mode.

  In the prior art, for AP and PS mode STAs, broadcast and multicast data were transmitted to all STAs immediately after the DTIM beacon set and notified in advance by the AP, whereas in the second invention, In the method, the STA that has shifted to the PS mode and is not performing the multicast communication detects the timing at which the broadcast packet is transmitted by monitoring the DTIM beacon for a certain period, and switches from the sleep mode to the awake mode at the detected timing. The point which performs state transition control operation differs from a prior art.

  The prior art is that STAs that are in AP and PS modes and are not performing multicast data communication perform transmission / reception control related to both broadcast data at intervals of n times the DTIM beacon set and notified in advance. Unlike this, there is an effect that the power saving of the local station STA can be improved without being influenced by the transmission / reception timing of the STA performing the multicast data communication in the PS mode.

  Further, according to the present invention, an STA that has shifted to the PS mode and is not performing multicast communication detects the timing at which a broadcast packet is transmitted by monitoring the DTIM beacon for a certain period, and wakes up from the sleep mode at the detected timing. STA that does not perform multicast packet communication in PS mode autonomously controls the timing of state transition from sleep mode to active mode, unlike the prior art in that state transition control operation is performed to the mode. It is possible to determine and improve the power saving.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a diagram showing a broadcast data transmission procedure according to the first embodiment of the present invention.
The wireless NW configuration of FIG. 3 has STA1 [1-5] and STA2 [1-6] operating in the PS mode, and STA3 [1-10] operating in the active mode [1-13] (operating in the PS mode). STA) not connected is connected to AP [1-7]. STA1 [1-5] is a terminal that does not participate in the multicast service and does not receive multicast data. The AP transmits the broadcast data in a cycle [1-44] that is an integral multiple (n times) of the DTIM beacon transmission cycle [1-4] (in the example of FIG. 3, twice the DTIM beacon transmission cycle (n = 2)). If stored, broadcast data [1-1-11], [1-1-12], [1-1-13] (shown in white in the figure) are transmitted after the DTIM beacon transmission. Further, when multicast data is stored according to the conventional technique, multicast data [1-1-1], [1-1-2], [1-1-3] is transmitted after all DTIM beacons are transmitted. ], [1-1-4], [1-1-5] (shown in black in the figure). Here, the DTIM beacon transmission cycle or beacon cycle is set to a shorter period than a generally used period in consideration of a reduction in multicast data delay and fluctuation.

  The PS mode STA1 [1-5] not participating in the multicast service has a DTIM beacon transmission period [1--1] before the AP [1-7] transmits broadcast data in advance before starting communication in the PS mode. 44] (in this embodiment, twice the DTIM beacon period (n = 2)) is shared with AP [1-7]. First, at the start of operation in the PS mode, power saving control according to the conventional technique is performed. After that, STA1 [1-5] starts from the reception of the DTIM beacon immediately before receiving the broadcast [1-15], based on the period [1-44] information shared with AP [1-7] in advance. The cycle setting for changing the state from the sleep mode to the active mode is changed to cycle [1-11]. In the period [1-11] whose setting has been changed, the state is changed from the sleep mode to the active mode, and broadcast data is reliably received. Also, the PS mode STA [1-6] participating in the multicast service follows the period [1-12] so as to satisfy the condition that all DTIM beacons can be received in accordance with the power saving control procedure according to the prior art. The state transitions from the sleep mode to the active mode.

  FIG. 4 is a flowchart of an AP broadcast data transmission opportunity according to this embodiment. When the STA operating in the PS mode exists under the AP, the AP performs control by the broadcast transmission method shown in FIG. The AP starts [3-1-1] after completion of DTIM beacon transmission. A determination [3-1-2] is made as to whether or not the broadcast transmission cycle is known (n = 2) after completion of DTIM beacon transmission. If No [3-1-3], this control is terminated [3-1-4]. If it is Yes [3-1-5], it is judged [3-1-6] whether broadcast data to be transmitted is accumulated in the AP, and is not accumulated (No [3-1-7). ]), This control is terminated [3-1-4]. If it is stored (Yes [3-1-8]), broadcast data transmission processing is performed [3-1-9]. Thereafter, as long as broadcast data is accumulated, this operation is repeated [3-1-10].

  FIG. 5 is a flowchart of an active mode transition period changing method in a multicast service non-participating STA according to the present embodiment. The STA operating in the PS mode performs the control shown in FIG. 5 at the start of the PS mode operation. After the PS mode operation starts [3-2-1], the cycle for transitioning from the sleep mode to the active mode state is set to n = 1 (3-2-2). Thereafter, a determination [3-2-3] is made as to whether or not the user is participating in the multicast service. If it is participating (Yes [3-2-4]), this control ends [3-2-5], and the STA sets the period of the active mode state transition in the PS mode according to the set value of n = 1. Works with. If it is not participating (No [3-2-6]), when the state transitions to the active mode next time, a determination [3-2-7] of whether or not broadcast data has been received is performed. If broadcast data has not been received (No [3-2-8]), this determination [3-2-7] is performed repeatedly until broadcast data is received. When the broadcast data is received (Yes [3-2-9]), it is known (the information of the DTIM beacon transmission period before transmitting the broadcast data with the AP is shared in advance) of the active mode state transition Change [3-2-10] to cycle (n = 2). Thereafter, the active mode state transition period changed until the PS mode operation ends [3-2-11], and the PS mode is operated according to the changed value of n = 2. When the operation of the PS mode is completed (Yes [3-2-13]), the cycle of transition from the sleep mode to the active mode state is set to an initial value n = 1 [3-2-14], The control is terminated [3-2-5].

  FIG. 6 is a block diagram of AP broadcast data transmission control according to the present embodiment. As shown in FIG. 6, the AP stores the broadcast data received from the upper layer / wired NW in the broadcast data memory management unit [4-1-12]. The broadcast transmission cycle control unit [4-1-10] manages a cycle timer that is an integral multiple (n times) of the DTIM beacon transmission cycle for transmitting broadcast data, and transmits at the timing of the cycle for transmitting broadcast data. The instruction [4-1] is notified to the broadcast transmission control unit [4-1-13]. In the transmission control unit [4-1-13], when the broadcast data memory management unit [4-1-12] notifies [4-2] that broadcast data is accumulated, a transmission instruction [4-2] 4-1] is received, and after the DTIM beacon transmission, the stored broadcast data is extracted from the broadcast data memory management unit [4-1-12] [4-1-14], and the broadcast data transmission procedure is performed. carry out.

  FIG. 7 is a block diagram of broadcast data reception cycle control in PS mode STA according to the present embodiment. As shown in FIG. 7, the multicast participation determination unit [5-1-5] determines whether or not the STA of the local station is participating in the multicast service when the PS mode is started. If it is determined not to participate in the multicast service, notification from the multicast participation determination unit [5-1-5] to the broadcast reception determination unit and period control unit [5-1-8] [5-1-4] I do. In the broadcast reception determination unit and the cycle control unit [5-1-8], the PS mode control unit [5-3] instructs the transition from the sleep mode to the active mode [5-1] at a timing including all the DTIM beacon cycles. -9]. When broadcast data is received, a notification [5-1-7] is sent to the broadcast reception cycle control unit [5-2]. At this time, the broadcast reception determination unit and the cycle control unit [5-1-8] stop the control and the notification of the instruction [5-1-9]. In the broadcast reception cycle control unit [5-2], a cycle that is an integral multiple of the DTIM beacon transmission cycle for receiving broadcast data is set in advance, and a timer for that cycle is managed. Starting from the DTIM beacon immediately before the notification [5-1-7], the PS mode control unit [5-3] indicates an active mode transition instruction [5-1] at the timing of the DTIM beacon transmission cycle for receiving broadcast data. To be notified. The PS mode control unit [5-3] performs control to change the state from the sleep mode to the active mode at the notified timings [5-1-9] and [5-1]. That is, the PS mode control unit [5-3] receives the notification [5-1] so that the STA1 [1-5] shown in FIG. In the period [1-11] in which the control is performed at, control for changing the state from the sleep mode to the active mode is performed. When it is determined that the mobile station is participating in the multicast service, the multicast participation determination unit [5-1-5] notifies the active mode cycle control unit [5-1-6] of a notification [5-1-3]. Do. In the active mode cycle control unit [5-1-6], the PS mode control unit [5-3] notifies the active mode transition instruction [5-1-2] at a timing including all DITIM beacon cycles, and the PS The mode control unit [5-3] performs control to change the state from the sleep mode to the active mode. In this case, the STA2 [1-6] shown in FIG. 3 switches from the sleep mode to the active mode in the period [1-12] in which all the DITIM beacons controlled by the PS mode control unit [5-3] can be received. Control to change the state.

FIG. 8 is a diagram showing a procedure for determining the transition timing to the active mode according to the second embodiment of the present invention.
In addition to the differences in the invention of the procedure for transmitting broadcast data by the AP described in the first embodiment with respect to the prior art, the STA operating in the PS mode not participating in the multicast service is STA1 [1-5] shown in FIG. The timing of transition from the sleep mode to the active mode is determined by the example of the operation procedure. The AP is the same as the operation and block diagram shown in the first embodiment.

  First, at the start of operation in the PS mode, STA1 [1-5] performs power saving control according to the conventional technique (for example, STA1 [1-5] or STA2 [1-6] described in the prior art example of FIG. 2). Power saving control operation). After performing power saving control according to the prior art, monitoring the transmission status of DTIM beacons and broadcast data for each DTIM period [1-333] (in the example of FIG. 8, a period of four periods of DTIM beacon transmission) [ 1-99-1] to [1-99-4] (all in the figure are displayed as [1-99]). In the monitoring [1-99-1] to [1-99-4], after the DTIM beacon is received, the DTIM beacon in which the broadcast is received is monitored, and the DTIM beacon transmission period (all DTIM beacon transmission) of the monitoring target is monitored. A value of a period [1-222]) that is an integral multiple (n times) of the period is calculated. Based on this calculated value, STA1 [1-5] determines the beacon reception cycle so as to satisfy the condition for state transition from the sleep mode to the active mode at the timing of cycle [1-222], and ends the monitoring. In the example of FIG. 8, twice (n = 2) the DTIM beacon transmission period is a value obtained from the statistical value information. After monitoring [1-99], the period [1-222] that is an integral multiple of the determined DTIM beacon transmission period from the timing [1-444] at which the DTIM beacon immediately before the broadcast data is received is transmitted. The procedure for changing the state from the sleep mode to the active mode is performed in FIG. The implementation procedure is the same as that of FIG. That is, the STA1 [1-5] that does not perform the multicast data communication performs control to change the state from the sleep mode to the active mode in the period [1-11]. Similarly, STA2 [1-6] that performs multicast data communication performs control to change the state from the sleep mode to the active mode in period [1-12].

  FIG. 9 is a flowchart of an active mode transition period changing method in a multicast service non-participating STA according to the present embodiment. The STA operating in the PS mode performs the control shown in FIG. 9 at the start of the PS mode operation. After the PS mode operation starts [3-2-1], the cycle for transitioning from the sleep mode to the active mode state is set to n = 1 (3-2-2). Thereafter, a determination [3-2-3] is made as to whether or not the user is participating in the multicast service. If it is participating (Yes [3-2-4]), this control ends [3-2-5], and the STA sets the period of the active mode state transition in the PS mode according to the set value of n = 1. Works with. If it is not participating (No [3-2-6]), the broadcast data transmission status is monitored [6-1-1] for each DTIM period. A determination [6-1-2] is made as to whether or not the broadcast reception cycle has been calculated by monitoring. This determination is repeated until it is calculated (No [6-1-3]). If calculated (Yes [6-1-4]), the monitoring is terminated [6-1-12]. Next, when the state transitions to the active mode, determination [6-1-5] is performed as to whether broadcast data has been received. If broadcast data has not been received (No [6-1-6]), this determination [6-1-5] is repeated until broadcast data is received. When broadcast data is received (Yes [6-1-7]), the calculated broadcast reception cycle is changed / set to the active mode state transition cycle [6-1-8] (in the example of FIG. [1-222] of 8 is the calculation result, and is changed to n = 2). Thereafter, the active mode state transition period changed until the PS mode operation ends [3-2-11], and the PS mode is operated according to the changed value of n = 2. When the operation of the PS mode is completed (Yes [3-2-13]), the cycle of transition from the sleep mode to the active mode state is set to an initial value n = 1 [3-2-14], The control is terminated [3-2-5].

  FIG. 10 is a block diagram of broadcast data reception cycle control in PS mode STA according to the present embodiment. As shown in FIG. 10, the multicast participation determination unit [5-1-5] determines whether the STA of the local station is receiving the multicast service when the PS mode starts. If it is determined not to participate in the multicast service, notification from the multicast participation determination unit [5-1-5] to the broadcast reception determination unit and period control unit [5-1-8] [5-1-4] At the same time, a monitoring start instruction is sent to the monitoring control unit [5-1-10] [5-1-11]. Broadcast reception determination unit and cycle control unit [5-1-8] notify PS mode control unit [5-3] active mode transition instruction [5-1-9] at timings including all DITIM beacon cycles. To do. In addition, the monitoring control unit [5-4] monitors a cycle in which the DTIM beacon signal and the broadcast data are transmitted over a certain period. When the transmission cycle of the DTIM beacon immediately before the broadcast data is transmitted is detected, the broadcast reception determination unit and the cycle control unit [5-1-8] are notified of the detected DTIM beacon transmission cycle information [5-1-. 10]. In addition, after the notification [5-1-10] is performed, the monitoring control is stopped. That is, the monitoring control is a control that is performed under a certain condition from when the DTIM beacon is transmitted until the DTIM beacon transmission cycle is detected. After the detection, the monitoring control is performed based on the detected DTIM beacon transmission cycle information. In the broadcast reception determination unit and the cycle control unit [5-1-8], when broadcast data is received after the notification [5-1-10], the DTIM beacon transmission cycle of the notified [5-1-10] is transmitted. The broadcast reception cycle control unit [5-2] including the information is notified [5-1-7]. At this time, the broadcast reception determination unit and the cycle control unit [5-1-8] stop the control and the notification of the instruction [5-1-9]. The broadcast reception cycle control unit [5-2] manages the setting of the DTIM beacon cycle and the set cycle timer for receiving broadcast data based on the notified DTIM beacon transmission cycle information. The reception of the DTIM beacon immediately before the notification [5-1-7] is started, and the timer is started, and the PS mode control unit [5-3] is notified [5-1] of the active mode transition instruction at the set timing. The PS mode control unit [5-3] performs control to change the state from the sleep mode to the active mode based on the notification information [5-1-9 and 5-1]. That is, in PS mode control section [5-3], STA1 [1-5] shown in FIG. 3 is received by PS mode control section [5-3] in order to reliably receive broadcast data by notification [5-1]. In the cycle [1-11] in which the control is performed, control is performed to change the state from the sleep mode to the active mode. When it is determined that the mobile station is participating in the multicast service, the multicast participation determination unit [5-1-5] notifies the active mode cycle control unit [5-1-6] of a notification [5-1-3]. Do. In the active mode cycle control unit [5-1-6], the PS mode control unit [5-3] notifies the active mode transition instruction [5-1-2] at a timing including all the DTIM beacon cycles, and the PS The mode control unit [5-3] performs control to change the state from the sleep mode to the active mode. In this case, as in the PS mode operation performed by STA2 [1-6] shown in FIG. 3, a period [1-12] in which all DTIM beacons controlled by the PS mode control unit [5-3] can be received. , Control to change the state from the sleep mode to the active mode is performed.

  As mentioned above, the invention made by the present inventor has been specifically described based on the above embodiments. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. Of course.

It is a figure which shows the TIM information element of a beacon frame. It is a figure which shows the example of the broadcast / multicast data transmission procedure in PS mode in the conventional wireless LAN system. It is a figure which shows the broadcast data transmission procedure by Example 1 of this invention. It is a flowchart of the broadcast data transmission opportunity of AP by Example 1 of this invention. 4 is a flowchart of an active mode transition period changing method in a multicast service non-participating STA according to Embodiment 1 of the present invention. It is a block diagram of broadcast data transmission control of AP by Example 1 of this invention. It is a block diagram of broadcast data reception cycle control of PS mode STA according to Embodiment 1 of the present invention. It is a figure which shows the procedure which determines the transition timing to active mode by Example 2 of this invention. 7 is a flowchart of an active mode transition period changing method in a multicast service non-participating STA according to Embodiment 2 of the present invention. It is a block diagram of broadcast data reception cycle control of PS mode STA according to Embodiment 2 of the present invention.

Explanation of symbols

1-5... STA1 (operates in PS mode and does not participate in multicast service), 1-6... STA2 (operates in PS mode and participates in multicast service), 1-10... STA3 (always active) 1-7... AP, 1-2-1 to 1-2-3 ... DTIM beacon, 1-3-1 to 1-3-8 ... beacon, 1-1-1 to 1-1 -13 ... multicast data, 1-1-11 to 1-1-13 ... broadcast data, 2-1 ... number of intermittent beacons, 2-2 ... counter value until the next DTIM beacon is transmitted, 2- 3 ... Bitmap information for each destination, 4-1-10 ... Broadcast transmission cycle control unit, 4-1-12 ... Broadcast data memory management unit, 4-1-13 ... Broadcast transmission control unit, 5 1-5 ... Multicast participation determination unit, 5-1-6 ... Active mode cycle control unit, 5-1-8 ... Broadcast reception determination unit and cycle control unit, 5-2 ... Broadcast reception cycle control unit, 5-3 ... PS mode control unit, 5-4 ... monitoring control unit

Claims (7)

The wireless terminal device includes a plurality of wireless terminal devices that transmit and receive data by wireless packet communication with the wireless base station device, and one or more wireless terminal devices have a sleep mode that stops a data transmission / reception function and a data transmission / reception function. The wireless base station operates with power saving control that transitions to any state of the awake mode to be activated, and the wireless base station transmits a beacon signal at a constant cycle, and the distribution traffic display on the beacon signal at an intermittent cycle of the beacon signal Transmitting a beacon signal with a distribution traffic indication map, including map information, and means for transmitting broadcast and multicast data after transmitting the beacon signal with a distribution traffic indication map, and The wireless terminal device that operates under control controls the delivery traffic display map. Per beacon signal is a power-saving wireless LAN communication quality control method in a radio packet communication system for a state transition to the awake mode from the sleep mode condition is satisfied constant period always be received,
The radio base station apparatus transmits the broadcast data only after transmitting the beacon signal with the delivery traffic display map in a period n times (n is an integer of 2 or more) the intermittent period,
The wireless terminal device operating in the power saving control shares the information of the n times period with the wireless base station device in advance, and is transmitted at the n times period when the multicast data communication is not performed. A power-saving wireless LAN communication quality control method, wherein the state is changed from the sleep mode to the awake mode at a constant cycle that satisfies a condition that the beacon signal with a delivery traffic display map can be surely received. The wireless terminal device includes a plurality of wireless terminal devices that transmit and receive data by wireless packet communication with the wireless base station device, and one or more wireless terminal devices have a sleep mode that stops a data transmitting and receiving function and the data transmitting and receiving function. The wireless base station operates with power saving control that transitions to any state of the awake mode to be activated, and the wireless base station transmits a beacon signal at a constant cycle, and the distribution traffic display on the beacon signal at an intermittent cycle of the beacon signal Transmitting a beacon signal with a distribution traffic indication map, including map information, and means for transmitting broadcast and multicast data after transmitting the beacon signal with a distribution traffic indication map, and The wireless terminal device that operates under control controls the delivery traffic display map. Per beacon signal is a power-saving wireless LAN communication quality control method in a radio packet communication system for a state transition to the awake mode from the sleep mode condition is satisfied constant period always be received,
The radio base station apparatus transmits the broadcast data only after transmitting the beacon signal with the delivery traffic display map in a period n times (n is an integer of 2 or more) the intermittent period,
The wireless terminal device operating in the power saving control has a procedure of monitoring a reception cycle of the beacon signal with the delivery traffic display map over a certain period, and means for detecting the n-fold cycle by the monitoring procedure And when the multicast data communication is not performed, the sleep mode is changed from the sleep mode to the awake mode at a constant cycle at which the beacon signal with the delivery traffic display map transmitted at the detected n times cycle can be received without fail. A power-saving wireless LAN communication quality control method characterized by transitioning. The wireless terminal device includes a plurality of wireless terminal devices that transmit and receive data by wireless packet communication with the wireless base station device, and one or more wireless terminal devices have a sleep mode that stops a data transmission / reception function and a data transmission / reception function. The wireless base station operates with power saving control that transitions to any state of the awake mode to be activated, and the wireless base station transmits a beacon signal at a constant cycle, and the distribution traffic display on the beacon signal at an intermittent cycle of the beacon signal Transmitting a beacon signal with a distribution traffic indication map, including map information, and means for transmitting broadcast and multicast data after transmitting the beacon signal with a distribution traffic indication map, and The wireless terminal device that operates under control controls the delivery traffic display map. A the power-saving wireless LAN communication quality control system in a wireless packet communication system for a state transition from the sleep mode to the awake mode by satisfying a predetermined period per beacon signal can be received without fail,
The radio base station apparatus has control means for transmitting the broadcast data only after transmission of the beacon signal with the delivery traffic display map in a period n times the intermittent period (n is an integer of 2 or more). ,
The wireless terminal device operating in the power saving control shares the information of the n times period with the wireless base station device in advance, and is transmitted at the n times period when the multicast data communication is not performed. A power-saving wireless LAN communication quality control system, characterized by comprising control means for transitioning the state from the sleep mode to the awake mode at a fixed period that satisfies a condition that the beacon signal with the delivery traffic display map can be surely received. The wireless terminal device includes a plurality of wireless terminal devices that transmit and receive data by wireless packet communication with the wireless base station device, and one or more wireless terminal devices have a sleep mode that stops a data transmission / reception function and a data transmission / reception function. The wireless base station operates with power saving control that transitions to any state of the awake mode to be activated, and the wireless base station transmits a beacon signal at a constant cycle, and the distribution traffic display on the beacon signal at an intermittent cycle of the beacon signal Transmitting a beacon signal with a distribution traffic indication map, including map information, and means for transmitting broadcast and multicast data after transmitting the beacon signal with a distribution traffic indication map, and The wireless terminal device that operates under control controls the delivery traffic display map. A the power-saving wireless LAN communication quality control system in a wireless packet communication system for a state transition from the sleep mode to the awake mode by satisfying a predetermined period per beacon signal can be received without fail,
The radio base station apparatus has control means for transmitting the broadcast data only after transmission of the beacon signal with the delivery traffic display map in a period n times the intermittent period (n is an integer of 2 or more). ,
The wireless terminal device operating in the power saving control has a procedure of monitoring a reception cycle of the beacon signal with the delivery traffic display map over a certain period, and means for detecting the n-fold cycle by the monitoring procedure And when the multicast data communication is not performed, the sleep mode is changed from the sleep mode to the awake mode at a constant cycle at which the beacon signal with the delivery traffic display map transmitted at the detected n times cycle can be received without fail. A power-saving wireless LAN communication quality control system, characterized by comprising control means for making transitions. A radio base station apparatus in the power-saving wireless LAN communication quality control system according to claim 3 or 4,
A radio base station comprising a control means for transmitting the broadcast data only after transmission of the beacon signal with a delivery traffic display map in a period n times the intermittent period (n is an integer of 2 or more) apparatus. A wireless terminal device in the power-saving wireless LAN communication quality control system according to claim 3,
The distribution traffic display map transmitted in the cycle of n times when the information of the cycle of n times is shared in advance with the radio base station apparatus, operates in the power saving control and does not perform the multicast data communication. A wireless terminal apparatus comprising: a control unit that changes the state from the sleep mode to the awake mode at a constant period that satisfies a condition that an attached beacon signal can be surely received. A wireless terminal device in the power-saving wireless LAN communication quality control system according to claim 4,
A procedure for monitoring the reception cycle of the beacon signal with the delivery traffic display map over a certain period, and means for detecting the n-fold cycle according to the monitoring procedure, operating in the power saving control and Control means for transitioning the state from the sleep mode to the awake mode at a constant cycle at which the beacon signal with the delivery traffic display map transmitted at the detected n times cycle can be received without fail when multicast data communication is not performed A wireless terminal device comprising:

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