JP2020518148A - Terminal station and communication method - Google Patents

Abstract

A communication device of the present disclosure includes a first receiver that receives a downlink data frame from a base station during operation, a decoder that decodes data included in the received downlink data frame during operation, and a decoder WUR mode request indicating receipt notification information and a request to transition from main connection radio (PCR) mode to wakeup radio (WUR mode) when the stored data indicates that there is no buffered traffic to the communication device And a transmitter for transmitting the uplink frame to the base station during operation. [Selection diagram] Figure 1

Description

The present disclosure relates to a communication device and a communication method.

The IEEE (Institute of Electrical and Electronics Engineers) 802.11 Working Group stipulates modifications to the physical (PHY) layer standard and the medium access control (MAC) layer standard that enable the operation of wake-up radio (WUR) devices. There is. The WUR device is a companion radio device of a main connection radio (PCR) device (eg, IEEE 802.11a/b/g/n/ac/ax radio device). The PCR device included in the wireless communication device is used for transmitting and receiving user data, but the WUR device included in the device is not used for transmitting and receiving user data. The wireless communication device can operate in any of three power management modes: active mode, power save (PS) mode, and WUR mode. When the wireless communication device is operating in the WUR mode, the PCR device included in the device is turned off, but the WUR device included in the device is turned on, or periodically turned on or off. When the WUR device of the device receives a wake-up signal warning that there is traffic to be received by the PCR device of the device, the device enters the active mode or the PS mode to operate.

IEEE 802.11-17/0379r0, SFD MAC proposal, March 2017 IEEE 802.11-17/0342r4, WUR Negotiation and Acknowledgment Procedure Follow up, March 2017 IEEE 802.11-17/0071r0, High Level MAC Concept for WUR, January 2017

Work is underway on how wireless communication devices can efficiently change power management modes.

One non-limiting, exemplary embodiment of the present disclosure facilitates efficiently changing power management modes.

In one general aspect, the techniques disclosed herein include a first receiver that receives a downlink data frame from a base station during operation and a downlink data frame that is received during operation. And a decoder for decoding the data contained in the received notification information and transitioning from the main connection radio (PCR) mode to the WUR mode when the decoded data indicates that there is no buffered traffic to the communication device. A communication device comprising: a signal generator for generating an uplink frame, including a wake-up radio (WUR) mode request indicating the request; and a transmitter for transmitting the uplink frame to a base station during operation. To do.

It should be noted that general or specific embodiments may be implemented as systems, methods, integrated circuits, computer programs, storage media, or selective combinations thereof.

By utilizing the communication device and communication method described herein, the wireless communication device can efficiently change the power management mode.

Further benefits and advantages of the disclosed embodiments will be apparent from the specification and drawings. Although these benefits and/or advantages are individually obtained by the various embodiments and features of the specification and drawings, these embodiments and features may achieve one or more of such benefits and/or advantages. Not everything has to be provided to get it.

FIG. 1 is a diagram of an exemplary wireless network. FIG. 6 is a diagram of STA allowed power management mode changes according to the first aspect of the present disclosure. FIG. 8 is a diagram of STA allowed power management mode changes according to the second aspect of the present disclosure; FIG. 6 is a diagram of STA allowed power management mode changes according to a third aspect of the present disclosure. FIG. 6 is a diagram of an exemplary frame exchange for power management mode change according to the first embodiment of the present disclosure. 6 is a flow chart of an exemplary error recovery procedure according to the first embodiment of the present disclosure. FIG. 6 is a diagram of an exemplary frame exchange for power management mode change according to the second embodiment of the present disclosure. FIG. 6 is a diagram of an exemplary frame exchange for power management mode change according to the third embodiment of the present disclosure. 6 is a flow chart of an exemplary error recovery procedure according to the third embodiment of the present disclosure. FIG. 8 is a diagram of an exemplary frame exchange for power management mode change according to the fourth embodiment of the present disclosure. 6 is a flow chart of an exemplary error recovery procedure according to the fourth embodiment of the present disclosure. FIG. 8 is a diagram of an exemplary frame exchange for power management mode change according to the fifth embodiment of the present disclosure. 6 is a flow chart of an exemplary error recovery procedure according to the fifth embodiment of the present disclosure. FIG. 7 is a diagram of an exemplary frame exchange for power management mode change according to the sixth embodiment of the present disclosure. 6 is a flow chart of an exemplary error recovery procedure according to the sixth embodiment of the present disclosure. 6 is a flow chart of an exemplary error recovery procedure according to the sixth embodiment of the present disclosure. FIG. 8 is a diagram of an exemplary frame exchange for power management mode change according to the seventh embodiment of the present disclosure. 7 is a flow chart of an exemplary error recovery procedure according to the seventh embodiment of the present disclosure. FIG. 9 is a diagram of an exemplary frame exchange for power management mode change according to an eighth embodiment of the present disclosure. 9 is a flow chart of an exemplary error recovery procedure according to the eighth embodiment of the present disclosure. FIG. 9 is a diagram of an exemplary frame exchange for power management mode change according to the ninth embodiment of the present disclosure. 9 is a flow chart of an exemplary error recovery procedure according to the ninth embodiment of the present disclosure. FIG. 13 is a diagram of an exemplary frame exchange for power management mode change according to the tenth embodiment of the present disclosure. 10 is a flowchart of an exemplary error recovery procedure according to the tenth embodiment of the present disclosure. FIG. 13 is a diagram of an exemplary frame exchange for power management mode change according to the eleventh embodiment of the present disclosure. 10 is a flowchart of an exemplary error recovery procedure according to the eleventh embodiment of the present disclosure. FIG. 6 is a diagram of an exemplary format of an ACK frame containing a piggyback WUR mode request or response in accordance with the present disclosure. FIG. 6 is a diagram of an exemplary format of a BlockAck frame containing a piggyback WUR mode request or response in accordance with the present disclosure. FIG. 6 is an exemplary format of a data frame including a piggyback WUR mode request according to the present disclosure. FIG. 6 is a diagram of an exemplary format of a wakeup frame in accordance with the present disclosure. FIG. 6 is a diagram of an exemplary format of a WUR action frame in accordance with the present disclosure. FIG. 6 is a simplified block diagram of an exemplary WUR in accordance with the present disclosure. FIG. 3 is a detailed block diagram of an exemplary WUR according to the present disclosure. 1 is a simplified block diagram of an exemplary PCR according to the present disclosure. FIG. 6 is a detailed block diagram of an exemplary PCR according to the present disclosure.

The present disclosure can be better understood with the aid of the following figures and embodiments. The embodiments described herein are merely exemplary in nature and are used to describe some of the possible applications and uses of the present disclosure, and are expressly set forth herein. The alternative disclosure not described should not be construed as limiting the present disclosure.

In any wireless communication system, a variety of devices can be part of a wireless network, but each device differs in traffic demands, device capabilities, power supply types, and so on. For one class of devices, the bandwidth requirements are low and the QoS requirements are less stringent, but there is relatively much concern for power consumption (eg mobile phones). Another class of devices has very low duty cycles as well as low bandwidth requirements, but the impact of power consumption due to extremely small batteries or extremely long service life (eg, sensors for remote sensing). Can be very susceptible to

Many wireless communication systems have one or more central controllers, which determine wireless network coverage areas, radio frequency channels, device admission policies, coordination with other adjacent wireless networks, etc., and are usually Also acts as a gateway to the backend infrastructure network. Examples of central controllers are base stations or eNBs of cellular wireless networks or APs (access points) of WLANs (wireless local area networks).

Although the techniques described in this disclosure may be applied to many wireless communication systems by way of example, the remaining descriptions of this disclosure are described in terms of IEEE 802.11-based WLAN systems and related terminology. This should not be construed as limiting the present disclosure with respect to alternative wireless communication systems. In IEEE 802.11 based WLANs, most of the networks operate in infrastructure mode. That is, all or most of the traffic in the network needs to go through the AP. Therefore, any STA wishing to join the WLAN must first negotiate network membership with the AP via a process called association and authentication.

FIG. 1 shows an exemplary wireless network 100 including an AP 110 and multiple STAs. The AP 110 includes a PCR device (hereinafter simply referred to as “PCR”) 112. The STA 130 represents a device class with low bandwidth requirements and less stringent QoS requirements, but where relatively more attention may be paid to power consumption. The STA 140 represents another class of devices that have low bandwidth requirements but can be very sensitive to power consumption. In order to maximize energy efficiency, the STA 130 includes a WUR device 134 (hereinafter simply referred to as “WUR”) in addition to the PCR 132, and the STA 140 includes a WUR 144 in addition to the PCR 142. For that reason, both STA 130 and STA 140 are called WUR STAs.

After the STA (eg, 130) performs the association procedure with the AP 110, the STA operates in one of three power management modes: active mode, PS (power save) mode and WUR mode. For that reason, the active mode and the PS mode are called PCR modes. When the STA is operating in PS mode, its PCR is in the awake or doze state. In PS mode, the STA's PCR is awake when its PCR is active, ie, able to receive DL (downlink) traffic or send UL (uplink) traffic. .. The STA's PCR is also in the doze state when the PCR is not active, i.e. unable to send UL traffic or receive DL traffic. When a STA operates in active mode, its PCR is always awake. When a STA operates in WUR mode, its PCR is always in the doze state and its WUR can be always active or periodically active, which causes the WUR to wake up (eg, Unicast wake-up frame, multicast wake-up frame, or WUR beacon frame) can be received.

FIG. 2A illustrates STA-enabled power management mode changes in the network 100 according to the first aspect of the present disclosure. According to the first aspect of the present disclosure, an STA operating in the active or PS mode can directly transition to operating in the WUR mode in various ways.

The first way to transition to WUR mode is that the WUR mode request is carried in a dedicated management frame (eg, WUR mode request frame) or a control frame (eg, acknowledgment frame) or data frame addressed to the AP 110. Is piggybacked on. Operating in active or PS mode after receiving from the AP 110 a WUR mode response carried in an individual management frame (eg, WUR mode response frame) or piggybacked on a control frame (eg, acknowledgment frame) The STA may transition to operating in WUR mode.

In the second way of transitioning to WUR mode, the change from active or PS mode to WUR mode at the STA is sensed by the AP 110 without the aid of a WUR mode request or response according to the determined rules. In the first example, a STA operating in the active or PS mode is in the WUR mode if it did not receive DL traffic or send UL traffic to or from the AP 110 during the first determined period. Move to work with. On the other hand, if the AP 110 did not send DL traffic or receive UL traffic to or from the STA operating in the active or PS mode during the second determined period, the STA may WUR. It is presumed that it has shifted to operating in the mode. The second determined period may be longer than the first determined period because of the time required for the STA operating in the active or PS mode to transition to operating in the WUR mode.

In a second example, a STA operating in active mode sends a UL data frame containing a More Data field addressed to AP 110, set to 0 (ie, there is no more UL traffic buffered). Acknowledgment to a DL data frame containing a More Data field set to 0 (ie, there is no more DL traffic buffered for STAs) received from AP 110 or successfully received. When transmitting a frame, the STA transitions to operating in WUR mode. On the other hand, when the AP 110 transmits a reception notification frame notifying that the UL data frame including the More Data field set to 0, which is transmitted from the STA operating in the active mode, is successfully received, the AP 110 transmits the reception notification frame. , STA will transition to operating in WUR mode after receiving the acknowledgment frame. Similarly, when the AP 110 receives a reception notification frame notifying that the DL data frame addressed to the STA operating in the active mode and including the More Data field set to 0 has been successfully received, The AP 110 estimates that the STA will transition to operating in WUR mode after sending its acknowledgment frame.

Further details are now described with respect to a second example of a second way for a STA operating in PS mode to transition to WUR mode. If the STA operating in PS mode was transitioning from WUR mode before transitioning to the original WUR mode, the STA operating in PS mode is addressed to AP 110 and is set to 0. When the STA successfully receives the reception notification frame notifying that the UL data frame including the More Data field has been successfully received, the STA shifts to operate in the WUR mode. Similarly, when the STA operating in the PS mode transmits a reception notification frame notifying that the DL data frame including the More Data field set to 0 has been successfully received to the AP 110, the STA is in the WUR. Transition to operating in mode. On the other hand, when the AP 110 transmits a reception notification frame notifying that the UL data frame including the More Data field set to 0 has been successfully received to the STA operating in the PS mode, the AP 110 causes the STA to It is presumed that it will shift to operating in the WUR mode after receiving the reception notification frame. Similarly, when the AP 110 receives a reception notification frame from the STA operating in the PS mode, which notifies that the DL data frame including the More Data field set to 0 has been successfully received, the AP 110 outputs the STA , It is estimated that it will shift to operating in WUR mode after transmitting the reception notification frame.

If the STA operating in PS mode did not transition directly from WUR mode before transitioning to the original WUR mode, a UL data frame containing a More Data field set to 0 was successfully received. After receiving a reception notification frame notifying that the AP 110, or after transmitting a reception notification frame to the AP 110 notifying that the DL data frame including the More Data field set to 0 has been successfully received, , WUR mode, but not the doze state.

Between the above two ways the STA changes the power management mode from active or PS mode to WUR mode according to the first aspect of the present disclosure, the first way is that the new wakeup operating parameter is set by the individual management frame. Can be used to negotiate. On the other hand, the second approach does not incur any signaling overhead and thus can maximize channel efficiency.

According to the first aspect of the present disclosure, an STA operating in WUR mode can directly transition to operating in active or PS mode in various ways. A first method of transitioning from WUR mode to active or PS mode is to have a STA operating in WUR mode after receiving a wake-up signal (eg, a unicast wake-up frame) from AP 110 or when UL traffic is buffered. Can, in its own discretion, transition directly to operating in active or PS mode. In one example, a STA operating in WUR mode after receiving a wake-up signal (eg, a unicast wake-up frame) from AP 110, or when UL traffic is buffered, before it operates in WUR mode. Depending on whether it was operating in active mode or PS mode, it is possible to transition to operating in active or PS mode. The STA transitions to operating in the original active mode if it was operating in active mode before operating in WUR mode. Otherwise, the STA transitions to operate in the original PS mode. In another example, when UL traffic is buffered, a STA operating in WUR mode may transition directly to operating in active or PS mode based on UL traffic load. If a large amount of UL traffic is buffered, the STA can transition from WUR mode to active mode to reduce the delay or overhead that can be generated by operating in PS mode.

A second way of transitioning from WUR mode to Active or PS mode is that, after receiving a wake-up signal (eg, a unicast wake-up frame) from AP 110, an STA operating in WUR mode changes to the received wake-up signal. A direct transition to operating in active or PS mode can be made according to the included mode change instructions. For example, if the received wake-up signal indicates a change from WUR mode to active mode, the STA operating in WUR mode transitions to operating in active mode. Otherwise, the STA operating in WUR mode transitions to operating in PS mode. The AP 110 can select active mode or PS mode based on the DL traffic load of the STA. If a large amount of DL traffic is buffered for the STA, the AP 110 may signal a change from WUR mode to active mode with a wake-up signal to reduce the delay or overhead that may be generated by operating in PS mode. be able to.

According to the first aspect of the present disclosure, a STA operating in WUR mode is active or in WUR mode even if it receives no wake-up signal or UL traffic is not buffered. It is possible to shift to operating in PS mode. In this case, the STA operating in the WUR mode changes the management frame or the data frame including the Power Management subfield set to 0 to the AP 110 if the STA operating in the WUR mode changes to the power management mode. Must be sent for notification. The STA operating in the WUR mode may notify the AP 110 of a power management mode change data frame containing a Power Management subfield set to 1 if it transitions to operating in the PS mode. Must be sent to.

Between the above two ways the STA changes the power management mode from WUR mode to active or PS mode according to the first aspect of the present disclosure, the first way does not require any mode change related signaling. The second approach can reduce the delay or overhead that can be generated by operating in PS mode when a large amount of DL traffic is buffered.

FIG. 2B illustrates possible power management mode changes at the STAs (eg, 130) of network 100 according to the second aspect of the present disclosure. According to the second aspect of the present disclosure, the STA operating in the active or PS mode may directly transition to operating in the WUR mode in the same manner as the first aspect of the present disclosure. A STA operating in WUR mode cannot go directly to operating in active mode, but was it operating in active mode before operating in WUR mode, or was it operating in PS mode? Regardless, a wake-up signal (eg, a unicast wake-up frame) can be directly transferred to operating in PS mode after receiving from the AP 110 or when UL traffic is buffered.

According to the second aspect of the present disclosure, the STA operating in the WUR mode cannot directly shift to the active mode, so the power management mechanism of the network 100 can be simplified.

FIG. 2C illustrates a power management mode change possible at a STA (eg, 130) of network 100 according to a third aspect of the present disclosure. According to the third aspect of the present disclosure, the STA operating in the active mode cannot directly shift to operating in the WUR mode and vice versa, but the STA operating in the PS mode is A direct transition to operating in WUR mode can be made in the same manner as the second aspect of the present disclosure, and vice versa.

According to the third aspect of the present disclosure, the STA operating in the active mode cannot directly shift to operating in the WUR mode, and vice versa. It can be simplified.

According to the first, second or third aspect of the present disclosure, how the STA changes the power management mode between the active mode and the PS mode is defined in the IEEE 802.11-2016 standard. There is.

<First Embodiment>
FIG. 3A illustrates an exemplary frame exchange for power management mode change between AP 110 and STAs according to the first embodiment of the present disclosure. The first embodiment is consistent with the first aspect of the present disclosure described above. That is, according to the first embodiment, an STA operating in the active or PS mode can directly transition to operating in the WUR mode and vice versa.

At the start of frame exchange, the STA is assumed to be operating in PS mode. The STA sends a WUR mode request frame 302 to the AP 110 via its PCR to request that it enter WUR mode so that it has very little power operation. The WUR mode request frame 302 indicates the STA's new wakeup operating parameters (eg, the time required to turn on the PCR of the STA, and the required duty cycle of the STA's WUR receiver (ie, the periodic on/off schedule). )) when trying to negotiate, may include information about wake-up operating parameters. Upon receiving the WUR mode request frame 302, the AP 110 responds with a WUR mode response frame 304.

The WUR mode response frame 304 indicates whether the STA's request to enter WUR mode was accepted or rejected. The WUR mode response frame 304 may include information about the agreed wake-up operating parameters when the AP 110 seeks to change the wake-up operating parameters (eg, WUR beacon interval, and the agreed duty cycle of the STA's WUR receiver). it can. Upon receiving the WUR mode response frame 304 from the AP 110, if the request to enter WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 3A. Shift to operating in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the PS mode to the WUR mode in the above-described first way of transitioning to the WUR mode.

When DL traffic to the STA is buffered at AP 110, AP 110 sends a unicast wake-up frame 310 to the STA. Upon receiving the wake-up frame 310 via its WUR, the STA transitions to operating in PS mode and remains in the awake state because it was operating in PS mode before it operated in WUR mode. In other words, the STA transitions from WUR mode to active or PS mode in the first manner described above for transitioning to WUR mode. The STA then sends a PS poll frame 312 to the AP 110 via its PCR to obtain the buffered traffic and notifies that the wake-up frame 310 was successfully received.

The AP 110 responds immediately to the PS poll frame 312 with a buffered data frame 314 or with an ACK frame in which the first buffered data frame in the transmit queue follows in a separate TXOP ((Transmission Opportunity) transmission opportunity). To do. The More Data field in the outgoing data frame is set to 1 if there is more buffered traffic for the STA. Otherwise, the More Data field in the outgoing data frame is set to 0. The STA responds with a receive notification frame 316 to notify that the data frame 314 was successfully received. The reception notification frame is an ACK frame or a BlockAck frame. After sending the acknowledgment frame 316 indicating that the data frame 314 was successfully received with the More Data field set to 0, the STA requests the WUR mode to re-enter. The mode request frame 322 is transmitted to the AP 110. The WUR mode request frame 322 may include information about wake-up operating parameters when the STA wants to negotiate new wake-up operating parameters. Upon receiving the WUR mode request frame 322 from the STA, the AP 110 responds with the WUR mode response frame 324. The WUR mode response frame 324 may include information about the agreed wakeup operating parameters when the AP 110 attempts to change the wakeup operating parameters.

Upon receiving the WUR mode response frame 324 from the AP 110, if the request to enter WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 3A. Then, the operation shifts to the operation in the original WUR mode. Otherwise, the STA's power management mode remains unchanged. In the case of FIG. 3A, the STA changes the power management mode from the PS mode to the WUR mode in the above-described first manner of shifting to the WUR mode.

According to the first embodiment of the present disclosure, the STA can efficiently change its power management mode.

FIG. 3B shows an error recovery procedure 300 performed by the STA according to the first embodiment of the present disclosure. According to the error recovery procedure 300, the STA must maintain a counter called RetryCounter. Procedure 300 begins at step 330. In step 332, the STA initializes the value of RetryCounter to zero. In step 334, the STA determines whether the WUR mode response frame has been successfully received within the determined timeout interval after transmitting the WUR mode request frame. If the WUR mode response frame is successfully received within the determined timeout interval after transmitting the WUR mode request frame, then in step 344 the STA transitions to operating in WUR mode and then in step 350. The procedure 300 stops. Otherwise, in step 336, the STA increments the value of RetryCounter by 1.

In step 338, the STA determines whether the value of RetryCounter is less than the maximum number of allowed retransmissions of WUR mode request frame. If the value of RetryCounter reaches the maximum number of retransmissions allowed, the procedure 300 stops at step 350. Otherwise, the STA retransmits the WUR mode request frame in step 340 and then the procedure 300 jumps back to step 334.

<Second Embodiment>
FIG. 4 illustrates an exemplary frame exchange for power management mode change between AP 110 and STAs according to the second embodiment of the present disclosure. The second embodiment is consistent with the first aspect of the present disclosure. That is, according to the second embodiment, an STA operating in the active or PS mode can directly transition to operating in the WUR mode and vice versa.

At the start of frame exchange, the STA is assumed to be operating in active or PS mode. The STA sends a WUR mode request frame 402 to the AP 110 via its PCR to request to enter WUR mode so that it has very little power operation. The WUR mode request frame 402 wakes up when the STA attempts to negotiate new wake-up operating parameters (eg, the time required to turn on the PCR of the STA and the required duty cycle of the STA's WUR receiver). Information about up operating parameters may be included. Upon receiving the WUR mode request frame 402, the AP 110 responds with a WUR mode response frame 404. WUR mode response frame 404 indicates whether the STA's request to enter WUR mode was accepted or rejected. The WUR mode response frame 404 may include information about the wake-up operating parameters when the AP 110 attempts to change the wake-up operating parameters (eg, WUR beacon interval, and STA's WUR receiver agreed duty cycle). ..

Upon receipt of the WUR mode response frame 404 from the AP 110, if the request to enter the WUR mode is accepted, the STA may based on the wakeup operating parameters most recently agreed by the AP 110, as shown in FIG. Shift to operating in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the active or PS mode to the WUR mode in the above-described first way of transitioning to the WUR mode.

When a large amount of UL traffic is buffered on the STA, the STA transitions to operate in active mode. In other words, the STA changes the power management mode from WUR mode to active or PS mode in the above-described first way to transition from WUR mode to active or PS mode. The STA transmits a buffered data frame 412 that includes the Power Management subfield set to 0 at the head of the transmit queue. The More Data field in the outgoing data frame is set to 1 if there is more buffered traffic. Otherwise, the More Data field in the outgoing data frame is set to 0. The AP 110 responds with a receive notification frame 414 to notify that the data frame 412 was successfully received. The reception notification frame is an ACK frame or a BlockAck frame.

After receiving the acknowledgment frame 414 notifying that the data frame 412 was successfully received with the More Data field set to 0, the STA requests the WUR mode to re-enter. The mode request frame 422 is transmitted to the AP 110. The WUR mode request frame 422 may include information about wake-up operating parameters when the STA wants to negotiate new wake-up operating parameters. Upon receiving the WUR mode request frame 422 from the STA, the AP 110 responds with the WUR mode response frame 424. The WUR mode response frame 424 may include information about the agreed wakeup operating parameters when the AP 110 attempts to change the wakeup operating parameters. Upon receiving the WUR mode response frame 424 from the AP 110, if the request to enter WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 4A. Then, the operation shifts to the operation in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the active mode to the WUR mode in the above-described first way of transitioning to the WUR mode.

According to the second embodiment of the present disclosure, the STA can efficiently change its power management mode.

The second embodiment has the same error recovery procedure performed by the STA as the first embodiment of the present disclosure.

<Third Embodiment>
FIG. 5A shows an exemplary frame exchange for power management mode change between AP 110 and STAs according to the third embodiment of the present disclosure. The third embodiment is consistent with the first aspect of the present disclosure. That is, according to the third embodiment, an STA operating in the active or PS mode can directly transition to operating in the WUR mode and vice versa.

At the start of frame exchange, the STA is assumed to be operating in active or PS mode. The STA sends a WUR mode request frame 502 to the AP 110 via its PCR to request to enter WUR mode so that it has very little power operation. WUR mode request frame 502 wakes up when the STA attempts to negotiate new wake-up operating parameters (eg, the time required to turn on the PCR of the STA and the required duty cycle of the STA's WUR receiver). Information about up operating parameters may be included. Upon receiving the WUR mode request frame 502, the AP 110 responds with a WUR mode response frame 504. WUR mode response frame 504 indicates whether the STA's request to enter WUR mode was accepted or rejected. WUR mode response frame 504 may include information about the wake-up operating parameters when AP 110 attempts to change the wake-up operating parameters (eg, WUR beacon interval, and STA's WUR receiver agreed duty cycle). ..

Upon receiving the WUR mode response frame 504 from the AP 110, if the request to enter WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 5A. Shift to operating in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the active or PS mode to the WUR mode in the above-described first way of transitioning to the WUR mode.

When the DL traffic to the STA is buffered at the AP 110, the AP 110 sends a unicast wakeup frame 510 including a mode change command from WUR mode to PS mode to the STA. Upon receiving the wake-up frame 510 via its WUR, the STA transitions to operate in PS mode according to the mode change command in the receive wake-up frame 510 and remains in the awake state. In other words, the STA changes the power management mode from WUR mode to active or PS mode in the above-described second way to transition from WUR mode to active or PS mode.

The STA sends a PS poll frame 512 to the AP 110 via its PCR to obtain the buffered traffic and informs that the wake-up frame 510 was successfully received. The AP 110 responds immediately to the PS poll frame 512 with a buffered data frame or with an ACK frame with the first buffered data frame in the transmit queue following in a separate TXOP. The More Data field in the outgoing data frame is set to 1 if there is more buffered traffic for the STA. Otherwise, the More Data field in the outgoing data frame is set to 0.

The STA responds with a receipt notification frame to indicate that the data frame 514 was successfully received. The reception notification frame is an ACK frame or a BlockAck frame. In particular, upon receipt of a data frame 514 containing a More Data field set to 0, the STA acknowledges the successful receipt of the data frame 514 and requests re-entry to enter WUR mode. An A-MPDU (aggregated MAC protocol data unit) that aggregates the frame 516 and the WUR mode request frame 522 is transmitted to the AP 110. The A-MPDU WUR mode request frame 522 may include information about wake-up operating parameters when the STA attempts to negotiate new wake-up operating parameters.

When the A-MPDU that aggregates the reception notification frame 516 and the WUR mode request frame 522 is received from the STA, the AP 110 responds using the WUR mode response frame 524. The WUR mode response frame 524 may include information about the agreed wakeup operating parameters when the AP 110 attempts to change the wakeup operating parameters. Upon receiving the WUR mode response frame 524 from the AP 110, if the request to enter the WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 5A. Then, the operation shifts to the operation in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from PS mode to WUR mode in the above-described first way to transition from active or PS mode to WUR mode.

According to the third embodiment of the present disclosure, the time required to transmit the WUR mode request frame can be reduced, so that the channel efficiency is improved as compared to the first embodiment.

FIG. 5B shows an error recovery procedure 500 performed by the STA according to the third embodiment of the present disclosure. According to the error recovery procedure 500, the STA must maintain a counter called RetryCounter. Procedure 500 begins at step 530. In step 532, the STA initializes the value of RetryCounter to zero. In step 534, the STA determines whether the WUR mode response frame has been successfully received within the determined timeout interval after sending the aggregated acknowledgment message frame with the WUR mode request frame. If the WUR mode response frame is successfully received within the determined timeout interval after transmitting the WUR mode request frame and the aggregated reception notification frame, the STA transitions to operating in the WUR mode in step 544. Then, in step 550, the procedure 500 stops. Otherwise, in step 536, the STA increments the value of RetryCounter by 1.

In step 538, the STA determines if the value of RetryCounter is less than the maximum number of allowed retransmissions of WUR mode request frames. If the value of RetryCounter reaches the maximum number of retransmissions allowed, the procedure 500 stops at step 550. Otherwise, the STA retransmits the WUR mode request frame in step 540. In step 542, the STA checks if the WUR mode response frame was successfully received within the determined timeout interval after retransmitting the WUR mode request frame. If the WUR mode response frame is successfully received within the determined timeout interval after retransmitting the WUR mode request frame, the STA transitions to operating in WUR mode in step 544, and then in step 550. The procedure 500 stops. Otherwise, the procedure 500 jumps back to step 536.

<Fourth Embodiment>
FIG. 6A illustrates an exemplary frame exchange for power management mode change between AP 110 and STAs according to the fourth embodiment of the present disclosure. The fourth embodiment is consistent with the third aspect of the present disclosure. That is, according to the fourth embodiment, the STA operating in the active mode cannot directly shift to operating in the WUR mode, and vice versa.

At the start of frame exchange, the STA is assumed to be operating in PS mode. The STA sends a WUR mode request frame 602 to its AP 110 via its PCR to request to enter WUR mode so that it has very little power operation. WUR mode request frame 602 wakes up when the STA attempts to negotiate new wake-up operating parameters (eg, the time required to turn on the PCR of the STA and the required duty cycle of the STA's WUR receiver). Information about up operating parameters may be included. Upon receiving the WUR mode request frame 602, the AP 110 responds with a WUR mode response frame 604. WUR mode response frame 604 indicates whether the STA's request to enter WUR mode was accepted or rejected. WUR mode response frame 604 may include information about the agreed wake-up operating parameters when AP 110 attempts to change the wake-up operating parameters (eg, WUR beacon interval, and STA's WUR receiver's agreed duty cycle). it can.

Upon receiving the WUR mode response frame 604 from the AP 110, if the request to enter the WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 6A. Shift to operating in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the PS mode to the WUR mode in the above-described first way of transitioning to the WUR mode.

Once the DL traffic to the STA is buffered at AP 110, AP 110 sends a unicast wakeup frame 610 to the STA. Upon receiving the wake-up frame 610 via its WUR, the STA transitions to operating in PS mode and stays in the awake state because it cannot directly transition to operating in active mode.

The STA sends a PS poll frame 612 to the AP 110 via its PCR to obtain the buffered traffic and informs that the wake-up frame 610 was successfully received. The AP 110 responds immediately to the PS poll frame 612 with a buffered data frame or with an ACK frame with the first buffered data frame in the transmit queue following in a separate TXOP. The More Data field in the outgoing data frame is set to 1 if there is more buffered traffic. Otherwise, the More Data field in the outgoing data frame is set to 0.

The STA responds with an acknowledgment frame 616 to indicate that the data frame 614 was successfully received. The reception notification frame is an ACK frame or a BlockAck frame. In particular, upon receiving a data frame 614 that includes a More Data field set to 0, the STA notifies the data frame 614 that it was successfully received and requests to re-enter WUR mode. Alternatively, the reception notification frame 616 including the piggyback WUR mode request shown in FIG. 15 is transmitted to the AP 110. As described later, the WUR mode request is embedded in the field or subfield of the acknowledgment frame 616. In this case, the STA is unable to negotiate new wakeup operating parameters.

Upon receipt of the acknowledgment frame 616 containing the piggyback WUR mode request from the STA, the AP 110 responds with a WUR mode response frame 624. The WUR mode response frame 624 may include information about the agreed wakeup operating parameters when the AP 110 attempts to change the wakeup operating parameters. Upon receipt of the WUR mode response frame 624 from the AP 110, if the request to enter WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 6A. Then, the operation shifts to the operation in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the PS mode to the WUR mode by the above-described first method of shifting to the WUR mode.

According to the fourth embodiment of the present disclosure, it may be unnecessary to transmit the WUR mode request frame to enter the WUR mode, so that the channel efficiency is improved as compared to the first embodiment.

FIG. 6B shows an error recovery procedure 600 performed by the STA according to the fourth embodiment of the present disclosure. According to the error recovery procedure 600, the STA must maintain a counter called RetryCounter. The procedure 600 begins at step 630. In step 632, the STA initializes the value of RetryCounter to zero. In step 634, the STA determines whether the WUR mode response frame has been successfully received within the determined timeout interval after sending the acknowledgment frame including the piggyback WUR mode request. If the WUR mode response frame is successfully received within the determined timeout interval after sending the acknowledgment frame containing the piggyback WUR mode request, then in step 644 the STA transitions to operating in WUR mode, Next, in step 650, the procedure 600 stops. Otherwise, in step 636, the STA increments the value of RetryCounter by 1.

In step 638, the STA determines whether the value of RetryCounter is less than the maximum number of allowed retransmissions of acknowledgment frames containing piggyback WUR mode requests. If the value of RetryCounter reaches the maximum number of retransmissions allowed, the procedure 600 stops at step 650. Otherwise, the STA retransmits the acknowledgment frame containing the piggyback WUR mode request in step 640, and the procedure 600 then jumps back to step 634.

<Fifth Embodiment>
FIG. 7A illustrates an exemplary frame exchange for power management mode change between AP 110 and STAs according to the fifth embodiment of the present disclosure. The fifth embodiment is consistent with the second aspect of the present disclosure. That is, according to the fifth embodiment, the STA operating in the WUR mode cannot directly shift to operating in the active mode.

At the start of frame exchange, the STA is assumed to be operating in active or PS mode. The STA sends a WUR mode request frame 702 via its PCR to the AP 110 to request to enter WUR mode so that it has very little power operation. WUR mode request frame 702 wakes up when the STA attempts to negotiate new wake-up operating parameters (eg, the time required to turn on the PCR of the STA and the required duty cycle of the STA's WUR receiver). Information about up operating parameters may be included. Upon receiving the WUR mode request frame 702, the AP 110 responds with a WUR mode response frame 704. WUR mode response frame 704 indicates whether the STA's request to enter WUR mode was accepted or rejected. WUR mode response frame 704 may include information about wake-up operating parameters when AP 110 attempts to change wake-up operating parameters (eg, WUR beacon interval, and STA's WUR receiver agreed duty cycle). ..

Upon receiving the WUR mode response frame 704 from the AP 110, if the request to enter the WUR mode is accepted, the STA is based on the wakeup operating parameters most recently agreed by the AP 110, as shown in FIG. 7A. Shift to operating in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the active or PS mode to the WUR mode in the above-described first way of transitioning to the WUR mode.

Once the DL traffic to the STA is buffered, the AP 110 sends a unicast wakeup frame 710 to the STA. The wake-up frame 710 indicates whether the AP 110 responded with a WUR mode response after receiving the WUR mode request. Upon receiving the wake-up frame 710 via its WUR, the STA transitions from operating in WUR mode to operating in PS mode and stays in the awake state because it cannot directly transition to operating in active mode. ..

The STA sends a PS poll frame 712 to the AP 110 via its PCR to obtain the buffered traffic and informs that the wake-up frame 710 was successfully received. The AP 110 responds immediately to the PS poll frame 712 with a buffered data frame 714 or with an ACK frame with the first buffered data frame in the transmit queue following in a separate TXOP. The More Data field in the outgoing data frame is set to 1 if there is more buffered traffic. Otherwise, the More Data field in the data frame is set to 0.

The STA responds with a receive notification frame 716 to notify that the data frame 714 was successfully received. The reception notification frame is an ACK frame or a BlockAck frame. Upon receiving a data frame 714 that includes a More Data field set to 0, the STA notifies the data frame 714 that it was successfully received and requests to re-enter WUR mode to request the piggyback WUR mode. The reception notification frame 716 including the request is transmitted to the AP 110. The WUR mode request is embedded in the field or subfield of the acknowledgment frame 716 shown in FIG. 14 or FIG. 15, which will be described in detail later. In this case, the STA is unable to negotiate new wakeup operating parameters.

If the receive wake-up frame 710 indicates that the AP 110 is not responding with the WUR mode response after receiving the WUR mode request, the STA receives the acknowledgment frame 716 including the piggyback WUR mode request shown in FIG. 7A. And then move to operate in WUR mode based on the most recently agreed wake-up operating parameters by AP 110. In other words, the STA transitions to operate in WUR mode without waiting to receive a WUR mode response from AP 110. Otherwise, the STA transitions to operate in WUR mode after receiving the WUR mode response frame shown in FIG. 6A. In this case, the STA changes the power management mode from the PS mode to the WUR mode by the above-described first method of shifting to the WUR mode.

According to the fifth embodiment of the present disclosure, it may be unnecessary to transmit the WUR mode request frame and the WUR mode response frame to enter the WUR mode, so that the channel efficiency is improved as compared with the first embodiment. Be improved.

FIG. 7B shows an error recovery procedure 700 performed by the AP 110 according to the fifth embodiment of the present disclosure. According to the error recovery procedure 700, the AP 110 must maintain a counter called RetryCounter. The procedure 700 starts at step 730. In step 732, the AP 110 initializes the value of RetryCounter to zero. In step 734, the AP 110 determines whether the acknowledgment frame including the piggyback WUR mode request was successfully received within the predetermined timeout interval after transmitting the data frame including the More Data field set to 0. To decide. If the acknowledgment frame including the piggyback WUR mode request is successfully received within the determined timeout interval after transmitting the data frame including the More Data field set to 0, the AP 110 determines in step 744. Assuming the STA has transitioned to operating in WUR mode, the procedure 700 then stops at step 750. Otherwise, in step 736, the AP 110 increments the value of RetryCounter by 1.

At step 738, the AP 110 determines whether the value of RetryCounter is less than the maximum number of allowed retransmissions of data frames that include the More Data field set to 0. If the value of RetryCounter has reached the maximum number of retransmissions allowed, the procedure 700 proceeds to step 744. Otherwise, the AP 110 retransmits the data frame with the More Data field set to 0 in step 740, and the procedure 700 then jumps back to step 734.

<Sixth Embodiment>
FIG. 8A illustrates an exemplary frame exchange for power management mode change between AP 110 and STAs according to the sixth embodiment of the present disclosure. The sixth embodiment is consistent with the second aspect of the present disclosure. That is, according to the sixth embodiment, the STA operating in the WUR mode cannot directly shift to operating in the active mode.

At the start of frame exchange, the STA is assumed to be operating in active or PS mode. The STA sends a WUR mode request frame 802 to the AP 110 via its PCR to request that it enter WUR mode so that it has very little power operation. WUR mode request frame 802 wakes up when the STA attempts to negotiate new wake-up operating parameters (eg, the time required to turn on the PCR of the STA and the required duty cycle of the STA's WUR receiver). Information about up operating parameters may be included. Upon receiving the WUR mode request frame 802, the AP 110 responds with a WUR mode response frame 804. WUR mode response frame 804 indicates whether the STA's request to enter WUR mode was accepted or rejected. WUR mode response frame 804 may include information about the agreed wake-up operating parameters when AP 110 attempts to change the wake-up operating parameters (eg, WUR beacon interval and STA's WUR receiver's agreed duty cycle). it can.

Upon receiving the WUR mode response frame 804 from the AP 110, if the request to enter the WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 8A. Shift to operating in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the active or PS mode to the WUR mode in the above-described first way of transitioning to the WUR mode.

When UL traffic is buffered at the STA, the STA transitions from operating in WUR mode to operating in PS mode and stays awake because it cannot directly transition to operating in active mode. The STA transmits a buffered data frame including the Power Management subfield set to 1 at the head of the transmission queue. The More Data field in the data frame is set to 1 if there is more buffered traffic. Otherwise, the More Data field in the data frame is set to 0. The AP 110 responds with a receipt notification frame to notify that the data frame was successfully received. The reception notification frame is an ACK frame or a BlockAck frame.

In particular, the STA sends an A-MPDU that aggregates a data frame 812 containing a More Data field set to 0 and a WUR mode request frame 822 to the AP 110 to request to re-enter WUR mode. The WUR mode request frame 822 may include information about wake-up operating parameters when the STA wants to negotiate new wake-up operating parameters.

Upon receiving from the STA a data frame 812 aggregated with the WUR mode request frame 822 and containing a More Data field set to 0, the AP 110 aggregates the receipt notification frame 814 and the WUR mode response frame 824 into another A-. Respond with MPDU. The WUR mode response frame 824 may include information about the agreed wakeup operating parameters when the AP 110 attempts to change the wakeup operating parameters.

Upon receiving the aggregated acknowledgment message frame 814 with the WUR mode response frame 824 from the AP 110, if the request to enter the WUR mode is accepted, the STA will be most recently agreed by the AP 110, as shown in FIG. 8A. Based on the wake-up operation parameter thus determined, the operation shifts to the operation in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the PS mode to the WUR mode by the above-described first method of shifting to the WUR mode.

According to the sixth embodiment of the present disclosure, the time required for transmitting the WUR mode request frame and the WUR mode response frame is reduced, so that the channel efficiency is improved as compared with the second embodiment. ..

8B and 8C show an error recovery procedure 800 performed by the STA according to the sixth embodiment of the present disclosure. According to the error recovery procedure 800, the STA must maintain a counter called RetryCounter. Procedure 800 begins at step 830. In step 832, the STA initializes the value of RetryCounter to zero.

In step 834, the STA sends the data frame including the More Data field set to 0, which is aggregated with the WUR mode request frame, and then both the reception notification frame and the WUR mode response frame have the determined timeout interval. Determine if it was successfully received in. After sending a data frame containing a More Data field set to 0, aggregated with a WUR mode request frame, both an acknowledgment frame and a WUR mode response frame have been successfully received within a determined timeout interval. If so, the STA transitions to operating in WUR mode in step 848 and then the procedure 800 stops in step 860. Otherwise, the procedure 800 proceeds to step 836.

In step 836, the STA successfully receives the acknowledgment frame within the determined timeout interval after transmitting the data frame including the More Data field set to 0 and aggregated with the WUR mode request frame, and the WUR Check if the mode response frame was not successfully received. After transmitting the data frame containing the More Data field set to 0, which is aggregated with the WUR mode request frame, the reception notification frame is successfully received within the predetermined timeout interval, and the WUR mode response frame is successfully received. If not received, the STA increments the value of RetryCounter by 1 in step 838. Otherwise, the procedure 800 proceeds to step 850.

In step 840, the STA determines whether the value of RetryCounter is less than the maximum number of allowed retransmissions of WUR mode request frame. If the value of RetryCounter reaches the maximum number of retransmissions allowed, the procedure 800 stops at step 860. Otherwise, the STA retransmits the WUR mode request frame in step 842. In step 844, the STA checks if the WUR mode response frame has been successfully received within the determined timeout interval after retransmitting the WUR mode request frame. If the WUR mode response frame has been successfully received within the determined timeout interval after retransmitting the WUR mode request frame, the procedure 800 proceeds to step 848. Otherwise, the procedure 800 jumps back to step 838.

In step 850, the STA increments the value of RetryCounter by one. In step 852, the STA determines whether the value of RetryCounter is less than the maximum number of allowed retransmissions of data frames aggregated with WUR mode request frames. If the value of RetryCounter reaches the maximum number of retransmissions allowed, the procedure 800 stops at step 860. Otherwise, the STA retransmits the data frame containing the More Data field set to 0 aggregated with the WUR mode request frame in step 854, and then the procedure 800 proceeds to step 834.

<Seventh Embodiment>
FIG. 9A shows an exemplary frame exchange for power management mode change between AP 110 and STAs according to the seventh embodiment of the present disclosure. The seventh embodiment is consistent with the second aspect of the present disclosure. That is, according to the seventh embodiment, the STA operating in the WUR mode cannot directly shift to operating in the active mode.

At the start of frame exchange, the STA is assumed to be operating in active or PS mode. The STA sends a WUR mode request frame 902 to its AP 110 via its PCR to request to enter WUR mode so that it has very little power operation. The WUR mode request frame 902 wakes up when the STA attempts to negotiate new wake-up operating parameters (eg, the time required to turn on the PCR of the STA and the required duty cycle of the STA's WUR receiver). Information about up operating parameters may be included. Upon receiving the WUR mode request frame 902, the AP 110 responds with a WUR mode response frame 904. WUR mode response frame 904 indicates whether the STA's request to enter WUR mode was accepted or rejected. WUR mode response frame 904 may include information about the agreed wake-up operating parameters when AP 110 attempts to change the wake-up operational parameters (eg, WUR beacon interval, and STA's WUR receiver's agreed duty cycle). it can.

Upon receiving the WUR mode response frame 904 from the AP 110, if the request to enter WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 9A. Shift to operating in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the active or PS mode to the WUR mode in the above-described first way of transitioning to the WUR mode.

When UL traffic is buffered at the STA, the STA transitions from operating in WUR mode to operating in PS mode and stays awake because it cannot directly transition to operating in active mode. The STA transmits a buffered data frame including the Power Management subfield set to 1 at the head of the transmission queue. The More Data field in the data frame is set to 1 if there is more buffered traffic. Otherwise, the More Data field in the data frame is set to 0. The AP 110 responds with a receipt notification frame to notify that the data frame was successfully received. The reception notification frame is an ACK frame or a BlockAck frame.

In particular, the STA sends an A-MPDU that aggregates a data frame 912 containing a More Data field set to 0 and a WUR mode request frame 922 to the AP 110 to request to re-enter WUR mode. The WUR mode request frame 922 may include information about wake-up operating parameters when the STA wants to negotiate new wake-up operating parameters.

Upon receiving from the STA a data frame 912 aggregated with the WUR mode request frame 922 and containing a More Data field set to 0, the AP 110 responds with a receipt notification frame 914 containing a piggyback WUR mode response. The WUR mode response is embedded in a field or subfield of the acknowledgment frame 914, as shown in FIG. 14 or FIG. 15, which will be described in detail later. In this case, the AP 110 cannot change the wakeup operation parameter.

Upon receipt of the acknowledgment frame 914 including the piggyback WUR mode response from the AP 110, the STA decides to operate in the WUR mode based on the wakeup operating parameters most recently agreed by the AP 110, as shown in FIG. 9A. Transition. In this case, the STA changes the power management mode from the PS mode to the WUR mode by the above-described first method of shifting to the WUR mode.

According to the seventh embodiment of the present disclosure, the time required to transmit the WUR mode request frame can be reduced, and the WUR mode response frame does not have to be transmitted. Channel efficiency is improved in comparison.

FIG. 9B shows an error recovery procedure 900 performed by the STA according to the seventh embodiment of the present disclosure. According to the error recovery procedure 900, the STA must maintain a counter called RetryCounter. Procedure 900 begins at step 930. In step 932, the STA initializes the value of RetryCounter to zero.

In step 934, the STA determines the acknowledgment frame including the piggyback WUR mode response after transmitting the data frame including the More Data field set to 0 aggregated with the piggyback WUR mode request frame. Determine if successfully received within the timeout interval. After sending a data frame containing the More Data field set to 0, aggregated with the piggyback WUR mode request frame, the acknowledgment frame containing the piggyback WUR mode response is successfully sent within the determined timeout interval. If so, in step 944 the STA transitions to operating in WUR mode and then the procedure 900 stops in step 950. Otherwise, the STA increments the value of RetryCounter by 1 in step 936.

In step 938, the STA determines if the value of RetryCounter is less than the maximum number of allowed retransmissions of data frames containing the More Data field set to 0 aggregated with the WUR mode request frame. If the value of RetryCounter reaches the maximum number of retransmissions allowed, the procedure 900 stops at step 950. Otherwise, the STA retransmits the data frame containing the More Data field set to 0 aggregated with the WUR mode request frame in step 940, and then the procedure 900 proceeds to step 934.

<Eighth Embodiment>
FIG. 10A illustrates an exemplary frame exchange for power management mode change between AP 110 and STAs according to the eighth embodiment of the present disclosure. The eighth embodiment is consistent with the third aspect of the present disclosure. That is, according to the eighth embodiment, the STA operating in the WUR mode cannot directly shift to operating in the active mode, and vice versa.

At the start of frame exchange, the STA is assumed to be operating in PS mode. The STA sends a WUR mode request frame 1002 to the AP 110 via its PCR to request to enter WUR mode so that the power operation is very low. The WUR mode request frame 1002 is used to wake up when the STA attempts to negotiate new wake-up operating parameters (eg, the time required to turn on the PCR of the STA and the required duty cycle of the STA's WUR receiver). Information about up operating parameters may be included.

Upon receiving the WUR mode request frame 1002, the AP 110 responds with a WUR mode response frame 1004. WUR mode response frame 1004 indicates whether the STA's request to enter WUR mode was accepted or rejected. The WUR mode response frame 1004 may include information about the agreed wake-up operating parameters when the AP 110 attempts to change the wake-up operating parameters (eg, WUR beacon interval, and the STA's WUR receiver's agreed duty cycle). it can. Upon receiving the WUR mode response frame 1004 from the AP 110, if the request to enter WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 10A. Shift to operating in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the PS mode to the WUR mode in the above-described first way of transitioning to the WUR mode.

When UL traffic is buffered at the STA, the STA transitions from operating in WUR mode to operating in PS mode and stays awake because it cannot directly transition to operating in active mode. The STA transmits a buffered data frame including the Power Management subfield set to 1 at the head of the transmission queue. The More Data field in the data frame is set to 1 if there is more buffered traffic. Otherwise, the More Data field in the data frame is set to 0. The AP 110 responds with a receipt notification frame to notify that the data frame was successfully received. The reception notification frame is an ACK frame or a BlockAck frame.

In particular, the STA sends a data frame 1012 containing a More Data field set to 0 and a piggyback WUR mode request to the AP 110 to request to re-enter WUR mode. The WUR mode request is embedded in the field or subfield of the data frame 1012 as shown in FIG. In this case, the STA is unable to negotiate new wakeup operating parameters.

When the data frame 1012 including the More Data field set to 0 and the piggyback WUR mode request is received from the STA, the AP 110 responds using the A-MPDU that aggregates the reception notification frame 1014 and the WUR mode response frame 1024. To do. The WUR mode response frame 1024 may include an agreed wake-up operation parameter when the AP 110 attempts to change the wake-up operation parameter. Upon receipt of the aggregated acknowledgment message frame 1014 with the WUR mode response frame 1024 from the AP 110, if the request to enter the WUR mode is accepted, the STA will be most recently agreed by the AP 110, as shown in FIG. 10A. The operation proceeds to operate in the WUR mode on the basis of the wakeup operation parameter thus determined. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the PS mode to the WUR mode by the above-described first method of shifting to the WUR mode.

According to the eighth embodiment of the present disclosure, it is possible to reduce the time required to transmit the WUR mode response frame, and it is not necessary to transmit the WUR mode request frame. Therefore, the second embodiment The channel efficiency is improved compared to.

FIG. 10B shows an error recovery procedure 1000 performed by the STA according to the eighth embodiment of the present disclosure. According to the error recovery procedure 1000, the STA must maintain a counter called RetryCounter. Procedure 1000 begins at step 1030. In step 1032, the STA initializes the value of RetryCounter to zero.

In step 1034, the STA sends a data frame including a More Data field set to 0 and a piggyback WUR mode request, and then both the acknowledgment frame and the WUR mode response frame are within a determined timeout interval. Determines if it was successfully received. After sending a data frame containing a More Data field set to 0 and a piggyback WUR mode request, both an acknowledgment frame and a WUR mode response frame have been successfully received within a determined timeout interval. , The STA transitions to operating in WUR mode at step 1048, and then the procedure 1000 stops at step 1060. Otherwise, in step 1036, the STA successfully receives the acknowledgment frame within the determined timeout interval after transmitting the data frame including the More Data field set to 0 and the piggyback WUR mode request. And check if the WUR mode response frame has not been successfully received. After transmitting the data frame including the More Data field set to 0 and the piggyback WUR mode request, the reception notification frame is successfully received within the predetermined timeout interval, and the WUR mode response frame is successfully received. If not, the STA increments the value of RetryCounter by 1 in step 1038. Otherwise, the procedure 1000 proceeds to step 1050.

In step 1040, the STA checks if the value of RetryCounter is less than the maximum number of allowed retransmissions of WUR mode request frames. If the value of RetryCounter reaches the maximum number of retransmissions allowed, the procedure 1000 stops at step 1060. Otherwise, the STA sends a WUR mode request frame in step 1042.

In step 1044, the STA checks whether the WUR mode response frame has been successfully received within the determined timeout interval after transmitting the WUR mode request frame. If the WUR mode response frame has been successfully received within the determined timeout interval after sending the WUR mode request frame, the procedure 1000 proceeds to step 1048. Otherwise, the procedure 1000 jumps back to step 1038.

In step 1050, the STA increments the value of RetryCounter by one. In step 1052, the STA checks if the value of RetryCounter is less than the maximum number of allowed retransmissions of a data frame containing a More Data field set to 0 and a piggyback WUR mode request. If the value of RetryCounter reaches the maximum number of retransmissions allowed, the procedure 1000 stops at step 1060. Otherwise, the STA retransmits the data frame containing the More Data field set to 0 and the piggyback WUR mode request in step 1054, then the procedure 1000 proceeds to step 1034.

<Ninth Embodiment>
FIG. 11A illustrates an exemplary frame exchange for power management mode change between AP 110 and STAs according to the ninth embodiment of the present disclosure. The ninth embodiment is consistent with the third aspect of the present disclosure. That is, according to the ninth embodiment, the STA operating in the WUR mode cannot directly shift to operating in the active mode, and vice versa.

At the start of frame exchange, the STA is assumed to be operating in PS mode. The STA sends a WUR mode request frame 1102 to the AP 110 via its PCR to request to enter WUR mode so that the power operation is very low. The WUR mode request frame 1102 is used when the STA attempts to negotiate new wake-up operating parameters (eg, the time required to turn on the PCR of the STA and the required duty cycle of the STA's WUR receiver). Information about up operating parameters may be included.

Upon receiving the WUR mode request frame 1102, the AP 110 responds with a WUR mode response frame 1104. WUR mode response frame 1104 indicates whether the STA's request to enter WUR mode was accepted or rejected. WUR mode response frame 1104 may include information about wake-up operating parameters when AP 110 attempts to change wake-up operating parameters (eg, WUR beacon interval, and STA WUR receiver agreed duty cycle). .. Upon receiving the WUR mode response frame 1104 from the AP 110, if the request to enter WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 11A. Shift to operating in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the PS mode to the WUR mode in the above-described first way of transitioning to the WUR mode.

When UL traffic is buffered at the STA, the STA transitions from operating in WUR mode to operating in PS mode and stays awake because it cannot directly transition to operating in active mode. The STA transmits a buffered data frame including the Power Management subfield set to 1 at the head of the transmission queue. The More Data field in the data frame is set to 1 if there is more buffered traffic. Otherwise, the More Data field in the data frame is set to 0. The AP 110 responds with a receipt notification frame to notify that the data frame was successfully received. The reception notification frame is an ACK frame or a BlockAck frame.

In particular, the STA sends a data frame 1112 including a More Data field set to 0 and a piggyback WUR mode request to the AP 110 to request to re-enter WUR mode. The WUR mode request is embedded in the field or subfield of the data frame 1112, as shown in FIG. In this case, the STA is unable to negotiate new wakeup operating parameters.

Upon receiving from the STA a data frame 1112 including a More Data field set to 0 and a piggyback WUR mode request, the AP 110 responds with a receipt notification frame 1114 including a piggyback WUR mode response. The WUR mode response is embedded in the field or subfield of the acknowledgment frame 1114 as shown in FIG. 14 or 15. In this case, the AP 110 cannot change the wakeup operation parameter. Upon receipt of the acknowledgment frame 1114 containing the piggyback WUR mode response from the AP 110, the STA decides to operate in the WUR mode based on the wakeup operating parameters most recently agreed by the AP 110, as shown in FIG. 11A. Transition. In this case, the STA changes the power management mode from the PS mode to the WUR mode by the above-described first method of shifting to the WUR mode.

According to the ninth embodiment of the present disclosure, since it is not necessary to transmit the WUR mode request frame and the WUR mode response frame, the channel efficiency is improved as compared with the second embodiment.

FIG. 11B shows an error recovery procedure 1100 by the STA according to the ninth embodiment of the present disclosure. According to the error recovery procedure 1100, the STA must maintain a counter called RetryCounter. Procedure 1100 starts at step 1130. In step 1132, the STA initializes the value of RetryCounter to zero.

In step 1134, the STA sends a data frame including a More Data field set to 0 and a piggyback WUR mode request, and then receives an acknowledgment frame including a piggyback WUR mode response within a determined timeout interval. Determines if it was successfully received. After sending a data frame containing a More Data field set to 0 and a piggyback WUR mode request, a receipt notification frame containing a piggyback WUR mode response is successfully received within a determined timeout interval. , The STA transitions to operating in WUR mode in step 1144, then the procedure 1100 stops in step 1150. Otherwise, the STA increments the value of RetryCounter by 1 in step 1136. In step 1138, the STA determines whether the value of RetryCounter is less than the maximum number of allowed retransmissions of a data frame containing a More Data field set to 0 and a piggyback WUR mode request. If the value of RetryCounter reaches the maximum number of retransmissions allowed, the procedure 1100 stops at step 1150. Otherwise, the STA retransmits the data frame containing the More Data field set to 0 and the piggyback WUR mode request in step 1140, and then the procedure 1100 jumps back to step 1134.

<Tenth Embodiment>
FIG. 12A illustrates an exemplary frame exchange for power management mode change between AP 110 and STAs according to the tenth embodiment of the present disclosure. The tenth embodiment is consistent with the first aspect of the present disclosure. That is, according to the tenth embodiment, the STA operating in the WUR mode can directly transition to operating in the active or PS mode, and vice versa.

At the start of frame exchange, the STA is assumed to be operating in active or PS mode. The STA sends a WUR mode request frame 1202 via its PCR to the AP 110 to request to enter WUR mode so that it has very little power operation. The WUR mode request frame 1202 is used to wake the STA when it attempts to negotiate new wake-up operating parameters (eg, the time required to turn on the PCR of the STA and the required duty cycle of the STA's WUR receiver). Information about up operating parameters may be included. Upon receiving the WUR mode request frame 1202, the AP 110 responds with a WUR mode response frame 1204. WUR mode response frame 1204 indicates whether the STA's request to enter WUR mode was accepted or rejected. The WUR mode response frame 1204 may include information about the agreed wake-up operating parameters when the AP attempts to change the wake-up operating parameters (eg, WUR beacon interval, and the agreed duty cycle of the STA's WUR receiver). it can. Upon receiving the WUR mode response frame 1204 from the AP 110, if the request to enter WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 12A. Shift to operating in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the active or PS mode to the WUR mode, which shifts from the PS mode to the WUR mode, in the first manner described above.

Once the DL traffic to the STA is buffered, the AP 110 sends a unicast wakeup frame 1210 to the STA. The wake-up frame 1210 indicates a change from WUR mode to active mode because a large amount of DL traffic is buffered for the STA. Upon receiving the wake-up frame 1210 via its WUR, the STA transitions to operate in active mode according to the mode change instruction in the received wake-up frame 1210, and then the wake-up frame 1210 succeeds. The ACK frame 1212 including the Power Management subfield set to 0, which notifies that it has been received, is transmitted to the AP 110. In this case, the STA changes the power management mode from WUR mode to active or PS mode in the second manner described above. Upon receiving the ACK frame 1212, the AP 110 transmits the buffered data frame at the head of the transmission queue. The More Data field in the outgoing data frame is set to 1 if there is more buffered traffic. Otherwise, the More Data field in the data frame is set to 0. The STA responds with a receipt notification frame to indicate that the data frame was successfully received. The reception notification frame is an ACK frame or a BlockAck frame.

In particular, upon receiving a data frame 1214 that includes a More Data field set to 0, the STA sends a receipt notification frame 1216 to AP 110 for successful receipt of the data frame 1214, and then by the AP 110. Transition to operating in WUR mode based on the most recently agreed wake-up operating parameters. Upon receiving the receipt notification frame 1216, the AP 110 estimates that the STA has transitioned to operating in WUR mode. In this case, the STA changes the power management mode from the active mode to the WUR mode by the above-mentioned second method of shifting to the WUR mode.

According to the tenth embodiment of the present disclosure, it is not necessary to transmit the PS poll frame, the WUR mode request frame and the WUR mode response frame to enter the WUR mode, so that the channel compared to the first embodiment. Efficiency is improved.

FIG. 12B shows an error recovery procedure 1200 performed by the AP 110 according to the tenth embodiment of the present disclosure. According to the error recovery procedure 1200, the AP 110 must maintain a counter called RetryCounter. The procedure 1200 starts at step 1230. In step 1232, the AP 110 initializes the value of RetryCounter to zero.

In step 1234, the AP 110 determines whether the acknowledgment frame was successfully received within the determined timeout interval after transmitting the data frame including the More Data field set to 0. If the acknowledgment frame is successfully received within the determined timeout interval after sending the data frame with the More Data field set to 0, then in step 1244 the AP 110 causes the STA to operate in WUR mode. Procedure 1200, the procedure 1200 then stops at step 1250. Otherwise, the AP 110 increments the value of RetryCounter by 1 in step 1236. In step 1238, the AP 110 determines whether the value of RetryCounter is less than the maximum number of allowed retransmissions of data frames that include the More Data field set to 0. If the value of RetryCounter has reached the maximum number of retransmissions allowed, the procedure 1200 proceeds to step 1244. Otherwise, the AP 110 retransmits the data frame with the More Data field set to 0 in step 1240, and then the procedure 1200 jumps back to step 1234.

<Eleventh Embodiment>
FIG. 13A illustrates an exemplary frame exchange for power management mode change between AP 110 and STAs according to the eleventh embodiment of the present disclosure. The eleventh embodiment is consistent with the third aspect of the present disclosure. That is, according to the eleventh embodiment, the STA operating in the WUR mode cannot directly shift to operating in the active mode, and vice versa.

At the start of frame exchange, the STA is assumed to be operating in PS mode. The STA sends a WUR mode request frame 1302 to the AP 110 via its PCR to request to enter WUR mode so that it has very little power operation. The WUR mode request frame 1302 is used when the STA attempts to negotiate new wake-up operating parameters (eg, the time required to turn on the PCR of the STA and the required duty cycle of the STA's WUR receiver). Information about up operating parameters may be included. Upon receiving the WUR mode request frame 1302, the AP 110 responds with a WUR mode response frame 1304. WUR mode response frame 1304 indicates whether the STA's request to enter WUR mode was accepted or rejected. WUR mode response frame 1304 may include information about the agreed wake-up operating parameters when AP 110 attempts to change the wake-up operating parameters (eg, WUR beacon interval and STA's WUR receiver's agreed duty cycle). it can. Upon receiving the WUR mode response frame 1304 from the AP 110, if the request to enter the WUR mode is accepted, the STA may base the wake-up operating parameters on the most recently agreed by the AP 110, as shown in FIG. 13A. Shift to operating in the WUR mode. Otherwise, the STA's power management mode remains unchanged. In this case, the STA changes the power management mode from the PS mode to the WUR mode in the above-described first way of transitioning to the WUR mode.

When UL traffic is buffered at the STA, the STA moves to operate in PS mode and stays awake because it cannot directly move to operating in active mode. The STA transmits a buffered data frame including the Power Management subfield set to 1 at the head of the transmission queue. The More Data field in the data frame is set to 1 if there is more buffered traffic. Otherwise, the More Data field in the data frame is set to 0. The AP 110 responds with a receipt notification frame to notify that the data frame was successfully received. The reception notification frame is an ACK frame or a BlockAck frame.

In particular, when receiving from the STA a data frame 1312 containing a More Data field set to 0, the AP 110 responds with a receipt notification frame 1314 to the successful reception of the data frame 1312, and the STA It is presumed that it will shift to operating in WUR mode after receiving the reception notification frame 1314. Upon receiving the acknowledgment frame 1314 from the AP 110, the STA transitions to operate in WUR mode based on the most recently agreed wake-up operating parameters by the AP 110, as shown in FIG. 13A. In this case, the STA changes the power management mode from the PS mode to the WUR mode by the above-mentioned second method of shifting to the WUR mode.

According to the eleventh embodiment of the present disclosure, it is not necessary to transmit the WUR mode request frame and the WUR mode response frame to enter the WUR mode, so that the channel efficiency is improved as compared to the second embodiment. It

FIG. 13B shows an error recovery procedure 1300 by the STA according to the eleventh embodiment of the present disclosure. According to the error recovery procedure 1300, the STA must maintain a counter called RetryCounter. Procedure 1300 starts at step 1330. In step 1332, the STA initializes the value of RetryCounter to zero.

In step 1334, the STA determines whether the acknowledgment frame has been successfully received within the determined timeout interval after transmitting the data frame including the More Data field set to 0. If, after sending the data frame with the More Data field set to 0, the receipt notification frame was successfully received within the determined timeout interval, the STA at step 1344 shall operate in WUR mode. Transitioning, then procedure 1300 stops at step 1350. Otherwise, the STA increments the value of RetryCounter by 1 in step 1336. In step 1338, the STA determines whether the value of RetryCounter is less than the maximum number of allowed retransmissions of data frames containing the More Data field set to 0. If the value of RetryCounter reaches the maximum number of retransmissions allowed, the procedure 1300 stops at step 1350. Otherwise, the STA retransmits the data frame with the More Data field set to 0 in step 1340, and the procedure 1300 then jumps back to step 1334.

According to the present disclosure, whether the STA sends a WUR mode request frame or a piggyback WUR mode request depends on whether the STA attempts to negotiate new wakeup operating parameters. For example, the STA sends a WUR mode request frame when it wants to negotiate new wakeup operating parameters. Otherwise, the STA may send a piggyback WUR mode request.

According to the present disclosure, whether AP 110 sends a WUR mode response frame or a piggyback WUR mode response depends on whether AP 110 intends to change the wake-up operating parameter. For example, AP 110 sends a WUR mode response frame when AP 110 attempts to change the wake-up operating parameter. Otherwise, AP 110 may send a piggyback WUR mode response.

According to the present disclosure, after the power management mode change operation according to various embodiments is completed, the STA transitions to operate in the WUR mode so that the duty cycle operation of the WUR receiver may be better for power saving. Start from the WUR off period.

<Exemplary format of ACK frame including piggyback WUR mode request or response>
FIG. 14 illustrates an exemplary format of an ACK frame 1400 including a piggyback WUR mode request or response according to this disclosure. The ACK frame 1400 includes a frame control field 1402. The frame control field 1402 includes a type field indicating that the ACK frame 1400 is a control frame, and further, a WUR mode request or response is piggybacked on the ACK frame 1400 depending on whether it is transmitted by the STA or the AP 110. Contains a subtype field that indicates that When the ACK frame 1400 is transmitted from the STA, the WUR mode request is piggybacked on the ACK frame 1400. Otherwise, the WUR mode response is piggybacked on the ACK frame.

<Example format of BlockAck including piggyback WUR mode request or response>
FIG. 15 illustrates an exemplary format of a BlockAck frame 1500 containing a piggyback WUR mode request or response according to this disclosure. The BlockAck frame 1500 includes a BA control field 1502. The BA control field 1502 includes a WUR mode request/response field 1504. The WUR mode request/response field 1504 is set to 1 to indicate that the WUR mode request or response is piggybacked in the BlockAck frame 1500 depending on whether it is sent by the STA or the AP 110, and also the BlockAck The WUR Mode Request/Response field is set to 0 to indicate in frame 1500 that the WUR Mode Request or Response has not been piggybacked. When the BlockAck frame 1500 including the WUR mode request/response field 1504 set to 1 is transmitted from the STA, the WUR mode request is piggybacked on the BlockAck frame 1500. Otherwise, the WUR mode response is piggybacked on the BlockAck frame 1500.

<Exemplary format of data frame including piggyback WUR mode request>
FIG. 16 illustrates an exemplary format of a data frame 1600 including a piggyback WUR mode request according to this disclosure. The data frame 1600 includes a frame control field 1602. The frame control field 1602 includes a type field indicating that the data frame 1600 is a data frame, and a subtype field indicating that the data frame 1600 is a QoS data frame piggybacking the WUR mode request.

<Exemplary format of wake-up frame>
FIG. 17 illustrates an exemplary format of a wakeup frame 1700 according to this disclosure. The wakeup frame 1700 includes a type field 1702, a BSS color field 1704, an AID field 1706, a mode change command field 1708 and a WUR mode response present field 1710. The type field 1702 indicates the type of wakeup frame 1700 (eg, unicast wakeup frame, WUR beacon frame or multicast wakeup frame). The BSS color field 1704 shows the identifier of the network 100. The AID field 1706 shows the identifier of the target STA. If the wakeup frame 1700 is not a unicast wakeup frame, the AID field 1706 is not present. The mode change command field 1708 indicates whether the target STA transitions from the WUR mode to operate in the active or PS mode after receiving the wakeup frame 1700. The WUR mode response present field 1710 indicates whether the AP 110 sends a WUR mode response after receiving the WUR mode request from the target STA.

<Exemplary format of WUR action frame>
FIG. 18 illustrates an exemplary format of a WUR Action Frame 1800 according to this disclosure. The WUR action frame 1800 includes a MAC header part 1810 and a frame body part 1820. The frame body portion 1820 includes a WUR action field 1822 and a result code field 1824. WUR action field 1824 indicates the type of WUR action frame 1800 (eg, WUR mode request frame 202 or WUR mode response frame 204). If the WUR action frame 1800 is a WUR mode response frame 204, the result code field 1824 indicates whether the STA's request to enter WUR mode was accepted or rejected and may include a WUR mode element 1826. .. The WUR mode element 1826 sends wakeup operating parameters (eg, WUR beacon interval, WUR receiver's agreed duty cycle for the target STA, the target STA's identifier used for unicast wakeup packets, and the wakeup frame). Frequency band and channel).

<Structure of WUR device>
FIG. 19A is a simplified block diagram of an exemplary WUR 1900 that can receive a wake-up signal. WUR 1900 may be WUR 134 of STA 130 or WUR 144 of STA 140 shown in FIG. The WUR 1900 includes a receiver 1910 and a reception signal processing circuit 1920. The receiver 1910 is responsible for receiving the wakeup signal, and the received signal processing circuit 1920 is responsible for processing the received wakeup signal.

FIG. 19B is a detailed block diagram of an example WUR 1900. WUR 1900 further comprises control circuitry 1930 used to control general MAC protocol operations. The receiver 1910 of the WUR1900 includes a PHY processing circuit 1912, which is responsible for converting the PPDU received via the antenna into a MAC frame (eg, wake-up frame or WUR beacon frame). The received signal processing circuit 1920 of the WUR1900 comprises a message processing circuit 1922, which processes the received MAC frame under the control of the control circuit 1930 according to various embodiments of the present disclosure (eg, MAC header). , Etc.) as well as sending corresponding MAC information to the control circuit 1930.

The WUR 1900 may include many other components not shown in Figures 19A and 19B for clarity of illustration. Only the components most relevant to this disclosure are shown.

<Configuration of PCR device>
FIG. 20A is a simplified block diagram of an exemplary PCR 2000 that can send and receive standard IEEE 802.11 signals. The PCR 2000 may be the PCR 112 of the AP 110 shown in FIG. 1, the PCR 132 of the STA 130, or the PCR 142 of the STA 140. In particular, the PCR 112 of the AP 110 can also send a wake-up signal. The PCR 2000 includes a transmission signal generation circuit 2010, a transceiver 2020, and a reception signal processing circuit 2030. The transmit signal generation circuit 2010 is responsible for generating standard IEEE 802.11 signals and wake-up signals, if applicable. The transceiver 2020 is responsible for transmitting the generated standard IEEE 802.11 signals and wake-up signals and receiving the standard IEEE 802.11 signals, if applicable. The reception signal processing circuit 2030 is also responsible for processing the received standard IEEE 802.11 signal.

FIG. 20B is a detailed block diagram of an exemplary PCR2000. The PCR 2000 further comprises a control circuit 2040 used to control general MAC protocol operation. The transmit signal generation circuit 2010 comprises a message generation circuit 2012, which under control of the control circuit 2040 according to various embodiments of the present disclosure, may include a MAC frame (eg, data frame, acknowledgment frame, WUR action frame). , Wake-up frame and WUR beacon frame). The transceiver 2020 includes a PHY processing circuit 2022. The PHY processing circuit 2022 forms the generated MAC frame into a PPDU, transmits the PPDU from an antenna, and transmits the PPDU received via the antenna to the MAC frame. Responsible for converting to. The reception signal processing circuit 2030 includes a message processing circuit 2032, and the message processing circuit 2032 processes the received MAC frame under the control of the processing circuit 2040 (for example, parsing the MAC header), And responsible for sending the corresponding MAC information to the control circuit 2040.

PCR 2000 may include many other components not shown in FIGS. 20A and 20B for clarity. Only the components most relevant to this disclosure are shown.

The present disclosure can be realized by software, hardware, or software that cooperates with hardware. Each functional block used in the description of each of the above embodiments can be partially or entirely realized by an LSI such as an integrated circuit, and each processing described in each of the embodiments can be performed by the same LSI or a combination of LSIs. Some or all can be controlled. The LSI may be separately formed as a plurality of chips, or one chip may be formed so as to include some or all of the functional blocks. The LSI can include a data input/output unit coupled to it. The LSI here can be called an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration. However, the technique for mounting the integrated circuit is not limited to the LSI and can be realized by using a dedicated circuit, a general-purpose processor, or a special-purpose processor. In addition, an FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI, or a reconfigurable processor that can reconfigure the connection and setting of circuit cells arranged inside the LSI can be used. The present disclosure may be implemented as digital or analog processing as a result of advances in semiconductor technology or other derivative technologies.

Multiple functional blocks may also be integrated using future integrated circuit technology if circuit integration technologies to replace the LSI emerge as a result of advances in semiconductor technology or other technologies derived from it. .. Another possibility is to apply biotechnology and/or the like.

The present disclosure can be applied to an apparatus and method for changing a power management mode in a wireless network.

110 AP
130, 140 STA
112, 132, 142, 2000 PCR
134, 144, 1900 WUR
1910 Receiver 1912, 2022 PHY processing circuit 1920, 2030 Reception signal processing circuit 1922, 2032 Message processing circuit 1930, 2040 Control circuit 2010 Transmission signal generation circuit 2012 Message generation circuit 2020 Transceiver

Claims (16)

A first receiver that receives a downlink data frame from a base station during operation;
A decoder for decoding the data contained in the received downlink data frame during operation;
When the decoded data indicates that there is no buffered traffic for the communication device, the reception notification information and the request to shift from the main connection radio (PCR) mode to the wake-up radio (WUR) mode are shown. A signal generator for generating an uplink frame, including a WUR mode request;
A transmitter for transmitting the uplink frame to the base station during operation;
A communication device including. The uplink frame is an aggregation of a reception notification frame and a WUR mode request frame,
The communication device according to claim 1. The uplink frame is a reception notification frame for piggybacking a WUR mode request,
The communication device according to claim 1. A second reception during operation of receiving a wake-up packet, which indicates whether the base station responds with a WUR mode response frame after receiving the uplink frame including acknowledgment information and a WUR mode request. Further equipped with a machine,
The communication device according to claim 1. WUR operating parameters remain unchanged when the received wake-up packet indicates that the base station does not send the WUR mode response frame.
The communication device according to claim 4. The received downlink data frame indicates whether the base station responds with a WUR mode response frame after receiving the uplink frame including acknowledgment information and a WUR mode request,
The communication device according to claim 1. WUR operating parameters remain unchanged when the received downlink data frame indicates that the base station does not transmit the WUR mode response frame,
The communication device according to claim 6. Depending on whether or not to negotiate new WUR operating parameters, the signal generator generates the uplink frame as an aggregation of an acknowledgment frame and a WUR mode request frame or as an acknowledgment frame piggybacking the WUR mode request. To do
The communication device according to claim 1. An uplink including uplink data and a WUR mode request indicating a request to transition from a main connection radio (PCR) mode to a wake-up radio (WUR) mode when there is no buffered traffic for the base station. A signal generator for generating frames,
A transmitter for transmitting the uplink frame to a base station during operation, and a receiver for receiving a downlink frame including acknowledgment information and a WUR mode response from the base station during operation,
A communication device including. The downlink frame is an aggregation of a reception notification frame and a WUR mode response frame,
The communication device according to claim 9. The downlink frame is an acknowledgment frame piggybacking the WUR mode response,
The communication device according to claim 9. The uplink frame is an aggregation of an uplink data frame and a WUR mode request frame,
The communication device according to claim 9. The uplink frame is an uplink data frame piggybacking the WUR mode request,
The communication device according to claim 9. The downlink frame is an acknowledgment frame for piggybacking the WUR mode response, and the uplink frame is an uplink data frame for piggybacking the WUR mode request.
The communication device according to claim 9. Depending on whether to negotiate new WUR operating parameters, the signal generator may use the uplink frame as an aggregation of an uplink data frame and a WUR mode request frame, or an uplink data frame that piggybacks the WUR mode request. Generate as,
The communication device according to claim 9. Depending on whether the base station tries to negotiate new WUR operating parameters, the received downlink frame is an aggregation of an acknowledgment frame and a WUR mode response frame, or a reception that piggybacks the WUR mode response. Is a notification frame,
The communication device according to claim 9.

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