US20080212508A1 - Power saving method in wireless lan system for permitting terminal station to promptly transition to doze state by transmitting empty data frame - Google Patents
Power saving method in wireless lan system for permitting terminal station to promptly transition to doze state by transmitting empty data frame Download PDFInfo
- Publication number
- US20080212508A1 US20080212508A1 US12/109,536 US10953608A US2008212508A1 US 20080212508 A1 US20080212508 A1 US 20080212508A1 US 10953608 A US10953608 A US 10953608A US 2008212508 A1 US2008212508 A1 US 2008212508A1
- Authority
- US
- United States
- Prior art keywords
- terminal station
- base station
- station
- data
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0235—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a power saving command
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/04—Scheduled or contention-free access
- H04W74/06—Scheduled or contention-free access using polling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a power saving method in a wireless LAN system, and more particularly, to a power saving method in a wireless LAN system conforming to IEEE802.11.
- Power saving in a wireless LAN system conforming to IEEE802.11 is performed in sequences illustrated in FIGS. 1A , 1 B, for example, as disclosed in IEEE Std 802.11, 9.7 Frame exchange sequences Table 21 Frame sequence.
- FIG. 1A is a sequence chart illustrating a sequence of operations when no data destined to a terminal station is stored in a base station.
- the terminal station transmits PS-Poll, which is a control packet for prompting the base station to transmit data, to the base station for requesting the base station to transmit downlink data destined thereto after the terminal station has transitioned to an active mode, in which a transmission/reception function turns on (step 101 ).
- PS-Poll is a control packet for prompting the base station to transmit data
- the base station for requesting the base station to transmit downlink data destined thereto after the terminal station has transitioned to an active mode, in which a transmission/reception function turns on (step 101 ).
- PS-Poll Upon receipt of PS-Poll without error, the base station transmits a successful reception notification signal ACK (step 102 ).
- ACK Upon receipt of PS-Poll without error, the base station transmits a successful reception notification signal ACK (step 102 ).
- the terminal station
- FIG. 1B is a sequence chart illustrating a sequence of operations when data destined to the terminal station has been stored in the base station.
- the terminal station transmits PS-Poll to the base station, after it has transitioned to the active mode, for requesting the base station to transmit downlink data destined thereto (step 111 ).
- the base station Upon receipt of PS-Poll without errors, the base station transmits a data frame (step 112 ).
- the terminal station Upon receipt of the data frame without errors, the terminal station transmits ACK (step 113 ).
- the terminal station transitions to the doze state after it has completed the transmission of ACK.
- FIG. 2 is a flow chart illustrating the operation of the terminal station in the foregoing situation.
- the terminal station starts a receiving operation, it transitions to an active state (step 201 ).
- the terminal station transmits PS-Poll to the base station for requesting the base station to transmit data destined to the terminal station (step 202 ).
- the terminal station determines whether a response to PS-Pall from the base station is ACK or data (step 203 ). If the terminal station fails to receive either ACK or data, the terminal station again transmits PS-Pall (step 202 ).
- the terminal station determines that there is no data destined thereto stored in the base station, and transitions to the doze state (step 205 ).
- the terminal station transmits ACK to the base station (step 204 ), and transitions to the doze state (step 205 ), followed by termination of the receiving operation.
- the base station when data destined to the terminal station is stored in the base station, the base station returns a data frame when it receives the PS-Poll signal from the terminal station without errors.
- conventional general wireless LAN base stations are often configured to return ACK to a terminal station in response to PS-Poll from the terminal station irrespective of the presence or absence of data to the terminal station. This is because it takes long time to complete the transmission of the data frame so that the base station informs, as a temporary measure, the terminal station that the PS-Poll signal has been received without errors. IEEE802.11 also approves that ACK is returned.
- FIGS. 3A , 3 B illustrate sequence charts when a base station returns ACK to a terminal station in response to PS-Poll from the terminal station irrespective of the presence or absence of data destined to the terminal station.
- FIG. 3A is a sequence chart when no data destined to a terminal station is stored in the base station.
- the terminal station transmits PS-Poll to the base station after it has transitioned to the active mode for requesting the base station to transmit downlink data destined thereto (step 301 ).
- the base station Upon receipt of PS-Poll without errors, the base station transmits ACK (step 302 ).
- FIG. 3B is a sequence chart when data destined to a terminal station is stored in a base station.
- the terminal station transmits PS-Poll to the base station after it has transitioned to the active mode for requesting the base station to transmit downlink data destined thereto (step 311 ).
- the base station Upon receipt of PS-Poll without errors, the base station transmits ACK to the terminal station (step 312 ).
- the base station When data destined to the terminal station is stored in the base station, the base station further transmits a data frame to the terminal station (step 313 ).
- the terminal station transmits ACK (step 314 ).
- data communications in a power save mode in a general wireless LAN differs in a frame sequence chart between the terminal station and base station depending on the presence or absence of data destined to the terminal station stored in the base station.
- the terminal station experiences difficulties in determining whether to transition to the doze state when no data is stored in the base station, resulting in difficulties in a reduction in power consumption. This is because the terminal station cannot determine the presence or absence of data destined thereto at the time it receives ACK, and therefore cannot promptly transition to the doze state.
- the terminal station does not know whether or not data destined thereto is present in the base station at the time it receives ACK. Therefore, even if there is no data destined to the terminal station, the terminal station cannot transition to the doze state immediately after the receipt of ACK.
- the base station upon receipt of a PS-Poll signal from a terminal station subordinate to a base station for prompting a transmission of data destined to the terminal station, transmits an ACK signal to the terminal station for indicating a successful reception of the PS-Poll signal, and also transmits a data frame including data destined to the terminal station when there is such data, or transmits an empty data frame when there is no data destined to the terminal station. Then, upon receipt of the data frame (including the empty data frame), the terminal station transmits an ACK signal to the base station, and then transitions to the doze state in which a transmission/reception function is made inoperative.
- the base station performs the same operation in response to PS-Poll from the terminal station as the operation when data is stored therein, so that the terminal station can transition to the doze state after it has completed a sequential frame exchange procedure, thus making it possible to save the power in the terminal station.
- FIGS. 1A , 1 B are sequence charts each illustrating a conventional power saving method in a wireless LAN system conforming to IEEE802.11, where FIG. 1A is a sequence chart when no data destined to a terminal station is stored in a base station, and FIG. 1B is a sequence chart when data destined to the terminal station is stored in the base station;
- FIG. 2 is a flow chart illustrating a sequence of operations performed by the terminal station in the processes of FIGS. 1A , 1 B;
- FIGS. 3A , 3 B are sequence charts each illustrating the operation of a base station when it returns ACK to a terminal station in response to PS-Poll from the terminal station irrespective of the presence or absence of data destined to the terminal station, where FIG. 3A is a sequence chart when no data destined to the terminal station is stored in the base station, and FIG. 3B is a sequence chart when data destined to the terminal station is stored in the base station;
- FIGS. 4A , 4 B are sequence charts each illustrating a power saving method according to the present invention in a wireless LAN system conforming to IEEE802.11, where FIG. 4A is a sequence chart when no data destined to a terminal station is stored in a base station, and FIG. 4B is a sequence chart when data destined to the terminal station is stored in the base station; and
- FIG. 5 is a flow chart illustrating a sequence of operations performed by the terminal station in the processes of FIGS. 4A , 4 B.
- FIGS. 4A , 4 B illustrate sequence charts of a power saving method in a wireless LAN system conforming to IEEE802.11 in accordance with the present invention.
- a base station returns ACK to a terminal station in response to PS-Poll from the terminal station irrespective of the presence or absence of data destined to the terminal station.
- FIG. 4A is a sequence chart when no data destined to a terminal station is stored in a base station.
- the terminal station transmits PS-Poll to the base station after it has transitioned to an active mode for requesting the base station to transmit downlink data destined thereto (step 401 ).
- the base station Upon receipt of PS-Poll without errors, the base station transmits ACK (step 402 ).
- the base station also transmits an empty data frame to the terminal station since the base station has not stored data destined to the terminal station (step 403 ).
- the terminal transmits ACK (step 404 ).
- the terminal station transitions to a doze state after it has completed the transmission of ACK.
- FIG. 4B is a sequence chart when data destined to the terminal station is stored in the base station.
- the terminal station transmits PS-Poll to the base station after it has transitioned to the active mode for requesting the base station to transmit downlink data destined to the terminal station (step 411 ).
- the base station Upon receipt of PS-Poll without errors, the base station transmits ACK (step 412 ). Since the base station has stored data destined to the terminal station, the base station also transmits a data frame to the terminal station in response to PS-Poll (step 413 ).
- the terminal station Upon receipt of the data frame without errors, the terminal station transmits ACK (step 414 ).
- the terminal station transitions to the doze state after it has completed the transmission of ACK.
- the base station performs the same operation in response to PS-Poll from the terminal station even when the base station has not stored data destined to the terminal station as the operation when the base station has stored data destined to the terminal station, thus permitting the terminal station to transition to the doze state after the completion of a sequential frame exchange procedure (completion of the transmission of the ACK signal).
- FIG. 5 illustrates a flow chart representing a sequence of operations performed by the terminal station in the processes of FIGS. 4A , 4 B.
- the terminal station starts a receiving operation, it transitions to the active state (step 501 ).
- the terminal station transmits PS-Poll to the base station for requesting the base station to transmit data destined to the terminal station (step 502 ).
- the terminal station determines whether or not it receives ACK which is a response from the base station to PS-Poll (step 503 ). In the event of a failure in receiving ACK, the terminal station again goes to step 502 for transmitting PS-Poll.
- the terminal station When ACK is successfully received, the terminal station receives data destined thereto, sent from the base station (the data frame received herein includes an empty data frame) (step 504 ). When receiving data, the terminal station transmits ACK to the base station, and transitions to the doze state (step 506 ), followed by completion of the receiving operation.
- the terminal station may determine whether the base station is a base station conforming to IEEE802.11 (i.e., a base station which only returns an ACK signal in response to PS-Poll from a terminal station when there is no data destined to the terminal station) or a base station which embodies the present invention (i.e., a base station which returns not only an ACK signal but also an empty data frame in response to PS-Poll from a terminal station even when there is not data destined to the terminal station, to select the sequence charts illustrated in FIGS. 3A , 3 B or FIGS. 4A , 4 B.
- IEEE802.11 i.e., a base station which only returns an ACK signal in response to PS-Poll from a terminal station when there is no data destined to the terminal station
- a base station which embodies the present invention i.e., a base station which returns not only an ACK signal but also an empty data frame in response to PS-Poll from a terminal station even when there is not data destined to
Abstract
A power saving method in a wireless LAN system is disclosed for permitting a terminal station to promptly transition to a doze state irrespective of the presence or absence of data destined to the terminal station in a base station. Upon receipt of a PS-Poll signal from a terminal station subordinate to a base station for prompting a transmission of data destined to the terminal station, the base station transmits an ACK signal to the terminal station for indicating a successful reception of the PS-Poll signal. Further, the base station transmits a data frame including data destined to the terminal station when there is such data, or transmits an empty data frame when there is no data destined to the terminal station. Then, upon receipt of the data frame (including the empty data frame), the terminal station transmits an ACK signal to the base station, and then transitions to the doze state in which a transmission/reception function is made inoperative.
Description
- 1. Field of the Invention
- The present invention relates to a power saving method in a wireless LAN system, and more particularly, to a power saving method in a wireless LAN system conforming to IEEE802.11.
- 2. Description of the Related Art
- Power saving in a wireless LAN system conforming to IEEE802.11 is performed in sequences illustrated in
FIGS. 1A , 1B, for example, as disclosed in IEEE Std 802.11, 9.7 Frame exchange sequences Table 21 Frame sequence. -
FIG. 1A is a sequence chart illustrating a sequence of operations when no data destined to a terminal station is stored in a base station. The terminal station transmits PS-Poll, which is a control packet for prompting the base station to transmit data, to the base station for requesting the base station to transmit downlink data destined thereto after the terminal station has transitioned to an active mode, in which a transmission/reception function turns on (step 101). Upon receipt of PS-Poll without error, the base station transmits a successful reception notification signal ACK (step 102). The terminal station transitions to a doze state in which the transmission/reception function turns off after it has completed the transmission of ACK. -
FIG. 1B is a sequence chart illustrating a sequence of operations when data destined to the terminal station has been stored in the base station. The terminal station transmits PS-Poll to the base station, after it has transitioned to the active mode, for requesting the base station to transmit downlink data destined thereto (step 111). Upon receipt of PS-Poll without errors, the base station transmits a data frame (step 112). Upon receipt of the data frame without errors, the terminal station transmits ACK (step 113). The terminal station transitions to the doze state after it has completed the transmission of ACK. -
FIG. 2 is a flow chart illustrating the operation of the terminal station in the foregoing situation. As the terminal station starts a receiving operation, it transitions to an active state (step 201). Next, the terminal station transmits PS-Poll to the base station for requesting the base station to transmit data destined to the terminal station (step 202). Next, the terminal station determines whether a response to PS-Pall from the base station is ACK or data (step 203). If the terminal station fails to receive either ACK or data, the terminal station again transmits PS-Pall (step 202). Upon receipt of ACK, the terminal station determines that there is no data destined thereto stored in the base station, and transitions to the doze state (step 205). Upon receipt of data, the terminal station transmits ACK to the base station (step 204), and transitions to the doze state (step 205), followed by termination of the receiving operation. - In the foregoing sequence of operations, when data destined to the terminal station is stored in the base station, the base station returns a data frame when it receives the PS-Poll signal from the terminal station without errors. However, conventional general wireless LAN base stations are often configured to return ACK to a terminal station in response to PS-Poll from the terminal station irrespective of the presence or absence of data to the terminal station. This is because it takes long time to complete the transmission of the data frame so that the base station informs, as a temporary measure, the terminal station that the PS-Poll signal has been received without errors. IEEE802.11 also approves that ACK is returned.
-
FIGS. 3A , 3B illustrate sequence charts when a base station returns ACK to a terminal station in response to PS-Poll from the terminal station irrespective of the presence or absence of data destined to the terminal station. -
FIG. 3A is a sequence chart when no data destined to a terminal station is stored in the base station. The terminal station transmits PS-Poll to the base station after it has transitioned to the active mode for requesting the base station to transmit downlink data destined thereto (step 301). Upon receipt of PS-Poll without errors, the base station transmits ACK (step 302). -
FIG. 3B is a sequence chart when data destined to a terminal station is stored in a base station. The terminal station transmits PS-Poll to the base station after it has transitioned to the active mode for requesting the base station to transmit downlink data destined thereto (step 311). Upon receipt of PS-Poll without errors, the base station transmits ACK to the terminal station (step 312). When data destined to the terminal station is stored in the base station, the base station further transmits a data frame to the terminal station (step 313). Upon receipt of the data frame without errors, the terminal station transmits ACK (step 314). - In this way, data communications in a power save mode in a general wireless LAN differs in a frame sequence chart between the terminal station and base station depending on the presence or absence of data destined to the terminal station stored in the base station. Then, as illustrated in
FIGS. 3A , 3B, when the base station returns ACK to the terminal in response to PS-Poll from the terminal station irrespective of the presence or absence of data destined to the terminal station, the terminal station experiences difficulties in determining whether to transition to the doze state when no data is stored in the base station, resulting in difficulties in a reduction in power consumption. This is because the terminal station cannot determine the presence or absence of data destined thereto at the time it receives ACK, and therefore cannot promptly transition to the doze state. This is because the terminal station does not know whether or not data destined thereto is present in the base station at the time it receives ACK. Therefore, even if there is no data destined to the terminal station, the terminal station cannot transition to the doze state immediately after the receipt of ACK. - It is an object of the present invention to provide a power saving method in a wireless LAN system, which permits a terminal station to promptly transition to the doze state irrespective of the presence or absence of data destined to the terminal station in a base station.
- To achieve the above object, in the power saving method of the present invention, upon receipt of a PS-Poll signal from a terminal station subordinate to a base station for prompting a transmission of data destined to the terminal station, the base station transmits an ACK signal to the terminal station for indicating a successful reception of the PS-Poll signal, and also transmits a data frame including data destined to the terminal station when there is such data, or transmits an empty data frame when there is no data destined to the terminal station. Then, upon receipt of the data frame (including the empty data frame), the terminal station transmits an ACK signal to the base station, and then transitions to the doze state in which a transmission/reception function is made inoperative.
- As described above, according to the present invention, even when no data destined to a terminal station is stored in a base station, the base station performs the same operation in response to PS-Poll from the terminal station as the operation when data is stored therein, so that the terminal station can transition to the doze state after it has completed a sequential frame exchange procedure, thus making it possible to save the power in the terminal station.
- The above and other objects, features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings which illustrate examples of the present invention.
-
FIGS. 1A , 1B are sequence charts each illustrating a conventional power saving method in a wireless LAN system conforming to IEEE802.11, whereFIG. 1A is a sequence chart when no data destined to a terminal station is stored in a base station, andFIG. 1B is a sequence chart when data destined to the terminal station is stored in the base station; -
FIG. 2 is a flow chart illustrating a sequence of operations performed by the terminal station in the processes ofFIGS. 1A , 1B; -
FIGS. 3A , 3B are sequence charts each illustrating the operation of a base station when it returns ACK to a terminal station in response to PS-Poll from the terminal station irrespective of the presence or absence of data destined to the terminal station, whereFIG. 3A is a sequence chart when no data destined to the terminal station is stored in the base station, andFIG. 3B is a sequence chart when data destined to the terminal station is stored in the base station; -
FIGS. 4A , 4B are sequence charts each illustrating a power saving method according to the present invention in a wireless LAN system conforming to IEEE802.11, whereFIG. 4A is a sequence chart when no data destined to a terminal station is stored in a base station, andFIG. 4B is a sequence chart when data destined to the terminal station is stored in the base station; and -
FIG. 5 is a flow chart illustrating a sequence of operations performed by the terminal station in the processes ofFIGS. 4A , 4B. -
FIGS. 4A , 4B illustrate sequence charts of a power saving method in a wireless LAN system conforming to IEEE802.11 in accordance with the present invention. Like the operations illustrated inFIGS. 3A , 3B, a base station returns ACK to a terminal station in response to PS-Poll from the terminal station irrespective of the presence or absence of data destined to the terminal station. -
FIG. 4A is a sequence chart when no data destined to a terminal station is stored in a base station. The terminal station transmits PS-Poll to the base station after it has transitioned to an active mode for requesting the base station to transmit downlink data destined thereto (step 401). Upon receipt of PS-Poll without errors, the base station transmits ACK (step 402). The base station also transmits an empty data frame to the terminal station since the base station has not stored data destined to the terminal station (step 403). Upon receipt of this empty data frame without errors, the terminal transmits ACK (step 404). The terminal station transitions to a doze state after it has completed the transmission of ACK. -
FIG. 4B is a sequence chart when data destined to the terminal station is stored in the base station. The terminal station transmits PS-Poll to the base station after it has transitioned to the active mode for requesting the base station to transmit downlink data destined to the terminal station (step 411). Upon receipt of PS-Poll without errors, the base station transmits ACK (step 412). Since the base station has stored data destined to the terminal station, the base station also transmits a data frame to the terminal station in response to PS-Poll (step 413). Upon receipt of the data frame without errors, the terminal station transmits ACK (step 414). The terminal station transitions to the doze state after it has completed the transmission of ACK. - In the foregoing manner, in this embodiment, the base station performs the same operation in response to PS-Poll from the terminal station even when the base station has not stored data destined to the terminal station as the operation when the base station has stored data destined to the terminal station, thus permitting the terminal station to transition to the doze state after the completion of a sequential frame exchange procedure (completion of the transmission of the ACK signal).
-
FIG. 5 illustrates a flow chart representing a sequence of operations performed by the terminal station in the processes ofFIGS. 4A , 4B. As the terminal station starts a receiving operation, it transitions to the active state (step 501). Next, the terminal station transmits PS-Poll to the base station for requesting the base station to transmit data destined to the terminal station (step 502). Then, the terminal station determines whether or not it receives ACK which is a response from the base station to PS-Poll (step 503). In the event of a failure in receiving ACK, the terminal station again goes to step 502 for transmitting PS-Poll. When ACK is successfully received, the terminal station receives data destined thereto, sent from the base station (the data frame received herein includes an empty data frame) (step 504). When receiving data, the terminal station transmits ACK to the base station, and transitions to the doze state (step 506), followed by completion of the receiving operation. - In another embodiment, when the terminal station comes under the control of a base station, the terminal station may determine whether the base station is a base station conforming to IEEE802.11 (i.e., a base station which only returns an ACK signal in response to PS-Poll from a terminal station when there is no data destined to the terminal station) or a base station which embodies the present invention (i.e., a base station which returns not only an ACK signal but also an empty data frame in response to PS-Poll from a terminal station even when there is not data destined to the terminal station, to select the sequence charts illustrated in
FIGS. 3A , 3B orFIGS. 4A , 4B. - While preferred embodiments of the present invention have been described using specific terms, such description is for illustrative purposes only, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claims.
Claims (6)
1. A power saving method in a wireless LAN system, comprising the steps of:
upon receipt of a signal at a base station from a terminal station subordinate to said base station for prompting a transmission of data destined to said terminal station, transmitting an ACK signal indicative of a successful reception of said signal to said terminal station, and transmitting a data frame including data destined to said terminal station when there is such data, and transmitting an empty data frame when there is no data destined to said terminal station; and
upon receipt of the empty data frame at said terminal station, transitioning to a state in which a transmission/reception function is made inactive.
2. A base station in a wireless LAN system including a terminal station which, upon receipt of an empty data frame at said terminal station, transitions to a state in which a transmission/reception function is made inactive, said base station comprising:
means responsive to a signal from a terminal station subordinate to said base station for prompting a transmission of data destined to said terminal station, for transmitting an ACK signal indicative of a successful reception of said signal to said terminal station; and
means responsive to the signal received from said terminal station for prompting a transmission of data destined to said terminal station, for generating and transmitting to said terminal station a data frame including data destined to said terminal station when there is such data, and for generating and transmitting to said terminal station an empty data frame when there is no data destined to said terminal station.
3. A terminal station in a wireless LAN system, comprising:
first means for transmitting a signal to a base station to which said terminal station is subordinate, for prompting a transmission of data destined to said terminal station; and
second means responsive to an empty data frame received from said base station, for transmitting an ACK signal to said base station and bringing said terminal station into a state in which a transmission/reception function is made inoperative.
4. A power saving method in a wireless LAN system including a terminal station which, upon receipt of an empty data frame at said terminal station, transitions to a state in which a transmission/reception function is made inactive, and a base station, said method comprising the steps of:
upon receipt of a signal from a terminal station subordinate to said base station for prompting a transmission of data destined to said terminal station, transmitting an ACK signal indicative of a successful reception of said signal to said terminal station; and
upon receipt of the signal received from said terminal station for prompting a transmission of data destined to said terminal station, generating and transmitting to said terminal station a data frame including data destined to said terminal station when there is such data, and for generating and transmitting to said terminal station an empty data frame when there is no data destined to said terminal station.
5. A power saving method in a terminal station of a wireless LAN system, said method comprising the steps of:
transmitting a signal to a base station to which said terminal station is subordinate for prompting a transmission of data destined to said terminal station, and
upon receipt of an empty data frame from said base station at said terminal station, transmitting an ACK signal to said base station, and bringing said terminal station into a state in which a transmission/reception function is made inoperative.
6. A wireless LAN system comprising: at lease a base station and a terminal station:
said base station including:
means responsive to a signal from a terminal station subordinate to said base station for prompting a transmission of data destined to said terminal station, for transmitting an ACK signal indicative of a successful reception of said signal to said terminal station; and
means responsive to the signal received from said terminal station for prompting a transmission of data destined to said terminal station, for generating and transmitting to said terminal station a data frame including data destined to said terminal station when there is such data, and for generating and transmitting to said terminal station an empty data frame when there is no data destined to said terminal station,
said terminal station including:
means for transmitting a signal to a base station to which said terminal station is subordinate, for prompting a transmission of data destined to said terminal station; and
means responsive to the empty data frame received from said base station for transmitting an ACK signal to said base station and bringing said terminal station into a state in which a transmission/reception function is made inoperative.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/109,536 US20080212508A1 (en) | 2004-06-28 | 2008-04-25 | Power saving method in wireless lan system for permitting terminal station to promptly transition to doze state by transmitting empty data frame |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004189759A JP4032257B2 (en) | 2004-06-28 | 2004-06-28 | Power saving method in wireless LAN, base station, terminal station, wireless LAN system |
JP2004-189759 | 2004-06-28 | ||
US11/166,276 US7391746B2 (en) | 2004-06-28 | 2005-06-27 | Power saving method in wireless LAN system for permitting terminal station to promptly transition to doze state by transmitting empty data frame |
US12/109,536 US20080212508A1 (en) | 2004-06-28 | 2008-04-25 | Power saving method in wireless lan system for permitting terminal station to promptly transition to doze state by transmitting empty data frame |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/166,276 Division US7391746B2 (en) | 2004-06-28 | 2005-06-27 | Power saving method in wireless LAN system for permitting terminal station to promptly transition to doze state by transmitting empty data frame |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080212508A1 true US20080212508A1 (en) | 2008-09-04 |
Family
ID=35505593
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/166,276 Expired - Fee Related US7391746B2 (en) | 2004-06-28 | 2005-06-27 | Power saving method in wireless LAN system for permitting terminal station to promptly transition to doze state by transmitting empty data frame |
US12/109,536 Abandoned US20080212508A1 (en) | 2004-06-28 | 2008-04-25 | Power saving method in wireless lan system for permitting terminal station to promptly transition to doze state by transmitting empty data frame |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/166,276 Expired - Fee Related US7391746B2 (en) | 2004-06-28 | 2005-06-27 | Power saving method in wireless LAN system for permitting terminal station to promptly transition to doze state by transmitting empty data frame |
Country Status (4)
Country | Link |
---|---|
US (2) | US7391746B2 (en) |
JP (1) | JP4032257B2 (en) |
CN (1) | CN1716894B (en) |
TW (1) | TWI269545B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090098866A1 (en) * | 2006-04-19 | 2009-04-16 | Tlefonaktiebolaget L M Ericsson (Publ) | Prioritized And Piggy-Backed ACK/NACK Reports |
US20100322217A1 (en) * | 2009-06-17 | 2010-12-23 | Electronics And Telecommunications Research Institute | Method for supporting idle mode in wireless local area network system |
US20140098727A1 (en) * | 2012-10-04 | 2014-04-10 | Apple Inc. | Methods and apparatus for network signaling during low-power operation |
US8997175B2 (en) * | 2010-07-21 | 2015-03-31 | Lenovo Innovations Limited (Hong Kong) | Wireless LAN communication terminal and communication control method thereof in wireless LAN system for the same |
WO2015069047A1 (en) * | 2013-11-06 | 2015-05-14 | 주식회사 케이티 | Method and device for transmitting and receiving data in wireless lan system |
US20160007254A1 (en) * | 2013-03-15 | 2016-01-07 | Intel Corporation | Downlink power management |
US20160277932A1 (en) * | 2013-03-15 | 2016-09-22 | Canon Kabushiki Kaisha | Communication apparatus, method of controlling the same, program, and printing apparatus |
US10264510B2 (en) | 2013-11-06 | 2019-04-16 | Kt Corporation | Method and device for transmitting and receiving data in wireless LAN system |
Families Citing this family (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7693117B2 (en) * | 2002-12-16 | 2010-04-06 | Avaya Inc. | Power-saving mechanism for periodic traffic streams in wireless local-area networks |
JP2006014167A (en) * | 2004-06-29 | 2006-01-12 | Nec Corp | Power saving method/program/recording medium for wireless lan, terminal station, and wireless lan system |
KR100615139B1 (en) * | 2005-10-18 | 2006-08-22 | 삼성전자주식회사 | Method and apparatus for allocating transmission period in wireless telecommunication system and therefor system |
TWI316374B (en) * | 2006-07-21 | 2009-10-21 | Hon Hai Prec Ind Co Ltd | System and method for saving power of station |
GB0616476D0 (en) | 2006-08-18 | 2006-09-27 | Fujitsu Ltd | Communication systems |
US8473647B2 (en) * | 2007-09-17 | 2013-06-25 | Apple Inc. | Methods and apparatus for decreasing power consumption and bus activity |
US8284706B2 (en) * | 2007-09-20 | 2012-10-09 | Qualcomm Incorporated | Semi-connected operations for wireless communications |
JP4907562B2 (en) * | 2008-01-08 | 2012-03-28 | 株式会社日立製作所 | Server, communication apparatus, communication system, and communication method |
US8699426B2 (en) * | 2008-03-26 | 2014-04-15 | Qualcomm Incorporated | Method and apparatus for resource allocation in wireless communication systems |
US9886231B2 (en) * | 2008-03-28 | 2018-02-06 | Kopin Corporation | Head worn wireless computer having high-resolution display suitable for use as a mobile internet device |
US8275261B2 (en) * | 2008-04-17 | 2012-09-25 | Pmc Sierra Ltd | Power saving in IEEE 802-style networks |
TWI369099B (en) * | 2008-05-08 | 2012-07-21 | Inst Information Industry | Relay station, access point, transmission method, and tangible machine-readable medium thereof for use in a wireless mesh network |
CN101610566B (en) * | 2008-06-19 | 2012-05-30 | 财团法人工业技术研究院 | System and method for dynamically regulating dormant/waking time course of wireless network device |
US20100039971A1 (en) * | 2008-08-15 | 2010-02-18 | Hong Kong Applied Science and Technology Research Institute, Co. | Power Management Method and Communication System |
US7903597B2 (en) * | 2008-10-29 | 2011-03-08 | Cisco Technology, Inc. | Power management of a network device |
CN102821445B (en) * | 2009-03-12 | 2016-03-30 | 华为技术有限公司 | The method and apparatus of base station energy-saving |
US8542620B2 (en) * | 2009-05-05 | 2013-09-24 | Qualcomm Incorporated | Dynamic energy saving mechanism for access points |
JP5258969B2 (en) * | 2009-08-21 | 2013-08-07 | 三菱電機株式会社 | PON system, subscriber-side terminator, station-side terminator, and power saving method |
US8576761B1 (en) * | 2009-09-18 | 2013-11-05 | Qualcomm Incorporated | Power save delivery mechanism for wireless communication traffic |
US8537733B1 (en) | 2010-02-12 | 2013-09-17 | Qualcomm Incorporated | Dynamic power mode switch in a wireless ad-hoc system |
US9311446B1 (en) | 2010-03-19 | 2016-04-12 | Qualcomm Incorporated | Multicast transmission for power management in an ad-hoc wireless system |
US8588156B1 (en) | 2010-04-27 | 2013-11-19 | Qualcomm Incorporated | Direct data communication in infrastructure mode in wireless communication systems |
US8526346B1 (en) | 2010-04-28 | 2013-09-03 | Qualcomm Incorporated | Power save communication mechanism for wireless communication systems |
US8611268B1 (en) | 2011-04-15 | 2013-12-17 | Qualcomm Incorporated | Access point power save mechanism for wireless communication systems |
US9019986B2 (en) * | 2011-11-18 | 2015-04-28 | Futurewei Technologies, Inc. | System and method for communications link control |
CN103188774B (en) * | 2011-12-29 | 2017-02-08 | 华为技术有限公司 | Method of achieving site sleep, device of achieving site sleep and system of achieving site sleep |
CA2812100C (en) * | 2012-02-03 | 2017-04-18 | Lg Electronics Inc. | Method for transmitting and receiving frame performed by station operating in power save mode in wireless local area network system and apparatus for the same |
US9049658B2 (en) | 2012-03-06 | 2015-06-02 | Qualcomm Incorporated | Power save mechanism for peer-to-peer communication networks |
KR101988320B1 (en) * | 2012-04-02 | 2019-06-12 | 엘지전자 주식회사 | Method and apparatus for accessing channel in wlan system |
US9585165B2 (en) | 2012-07-13 | 2017-02-28 | Lg Electronics Inc. | Method and apparatus for accessing channel using null data packet in wireless LAN system |
WO2017062947A1 (en) * | 2015-10-09 | 2017-04-13 | Interdigital Patent Holdings, Inc. | Procedures for high efficiency acknowledgement transmission |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6192230B1 (en) * | 1993-03-06 | 2001-02-20 | Lucent Technologies, Inc. | Wireless data communication system having power saving function |
US6463307B1 (en) * | 1998-08-14 | 2002-10-08 | Telefonaktiebolaget Lm Ericsson | Method and apparatus for power saving in a mobile terminal with established connections |
US20050018624A1 (en) * | 2003-07-24 | 2005-01-27 | Meier Robert C. | Uniform power save method for 802.11e stations |
US20050136833A1 (en) * | 2003-12-19 | 2005-06-23 | Emeott Stephen P. | Unscheduled power save delivery method in a wireless local area network for real time communication |
US7471664B2 (en) * | 2005-11-02 | 2008-12-30 | Intel Corporation | Network management policy and compliance in a wireless network |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2391285A1 (en) * | 1999-05-06 | 2000-05-04 | Rf Technologies, Inc. | An asset and personnel tagging system utilizing gps |
US6275500B1 (en) * | 1999-08-09 | 2001-08-14 | Motorola, Inc. | Method and apparatus for dynamic control of talk groups in a wireless network |
EP1342339A2 (en) * | 2000-12-08 | 2003-09-10 | Telefonaktiebolaget LM Ericsson (publ) | Method for power save in a mobile terminal |
JP2004104465A (en) | 2002-09-10 | 2004-04-02 | Sharp Corp | Communication device and terminal station |
-
2004
- 2004-06-28 JP JP2004189759A patent/JP4032257B2/en not_active Expired - Fee Related
-
2005
- 2005-06-17 TW TW094120165A patent/TWI269545B/en not_active IP Right Cessation
- 2005-06-23 CN CN2005100788472A patent/CN1716894B/en not_active Expired - Fee Related
- 2005-06-27 US US11/166,276 patent/US7391746B2/en not_active Expired - Fee Related
-
2008
- 2008-04-25 US US12/109,536 patent/US20080212508A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6192230B1 (en) * | 1993-03-06 | 2001-02-20 | Lucent Technologies, Inc. | Wireless data communication system having power saving function |
US6463307B1 (en) * | 1998-08-14 | 2002-10-08 | Telefonaktiebolaget Lm Ericsson | Method and apparatus for power saving in a mobile terminal with established connections |
US20050018624A1 (en) * | 2003-07-24 | 2005-01-27 | Meier Robert C. | Uniform power save method for 802.11e stations |
US20050136833A1 (en) * | 2003-12-19 | 2005-06-23 | Emeott Stephen P. | Unscheduled power save delivery method in a wireless local area network for real time communication |
US7471664B2 (en) * | 2005-11-02 | 2008-12-30 | Intel Corporation | Network management policy and compliance in a wireless network |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9001706B2 (en) | 2006-04-19 | 2015-04-07 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for improved data communication in cellular access systems |
US20090098866A1 (en) * | 2006-04-19 | 2009-04-16 | Tlefonaktiebolaget L M Ericsson (Publ) | Prioritized And Piggy-Backed ACK/NACK Reports |
US20120163303A1 (en) * | 2006-04-19 | 2012-06-28 | Telefonaktiebolaget L M Ericsson (Publ) | Method And Apparatus For Improved Data Communication In Cellular Access Systems |
US8630210B2 (en) * | 2006-04-19 | 2014-01-14 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for improved data communication in cellular access systems |
US8155034B2 (en) * | 2006-04-19 | 2012-04-10 | Telefonaktiebolaget L M Ericsson (Publ) | Prioritized and piggy-backed ACK/NACK reports |
US20100322217A1 (en) * | 2009-06-17 | 2010-12-23 | Electronics And Telecommunications Research Institute | Method for supporting idle mode in wireless local area network system |
US8705488B2 (en) | 2009-06-17 | 2014-04-22 | Electronics And Telecommunications Research Institute | Method for supporting idle mode in wireless local area network system |
US8997175B2 (en) * | 2010-07-21 | 2015-03-31 | Lenovo Innovations Limited (Hong Kong) | Wireless LAN communication terminal and communication control method thereof in wireless LAN system for the same |
US20140098727A1 (en) * | 2012-10-04 | 2014-04-10 | Apple Inc. | Methods and apparatus for network signaling during low-power operation |
US11019105B2 (en) * | 2013-03-15 | 2021-05-25 | Canon Kabushiki Kaisha | Communication apparatus, method of controlling the same, program, and printing apparatus |
US20160277932A1 (en) * | 2013-03-15 | 2016-09-22 | Canon Kabushiki Kaisha | Communication apparatus, method of controlling the same, program, and printing apparatus |
US20160007254A1 (en) * | 2013-03-15 | 2016-01-07 | Intel Corporation | Downlink power management |
US9628991B2 (en) * | 2013-03-15 | 2017-04-18 | Canon Kabushiki Kaisha | Communication apparatus, method of controlling the same, program, and printing apparatus |
US20170180994A1 (en) * | 2013-03-15 | 2017-06-22 | Canon Kabushiki Kaisha | Communication apparatus, method of controlling the same, program, and printing apparatus |
US9826446B2 (en) * | 2013-03-15 | 2017-11-21 | Intel Corporation | Downlink power management |
US10477399B2 (en) * | 2013-03-15 | 2019-11-12 | Canon Kabushiki Kaisha | Communication apparatus, method of controlling the same, program, and printing apparatus |
US10264510B2 (en) | 2013-11-06 | 2019-04-16 | Kt Corporation | Method and device for transmitting and receiving data in wireless LAN system |
US10721672B2 (en) | 2013-11-06 | 2020-07-21 | Kt Corporation | Method and device for transmitting and receiving data in wireless LAN system |
WO2015069047A1 (en) * | 2013-11-06 | 2015-05-14 | 주식회사 케이티 | Method and device for transmitting and receiving data in wireless lan system |
Also Published As
Publication number | Publication date |
---|---|
JP2006014028A (en) | 2006-01-12 |
JP4032257B2 (en) | 2008-01-16 |
US20050286454A1 (en) | 2005-12-29 |
CN1716894A (en) | 2006-01-04 |
TWI269545B (en) | 2006-12-21 |
US7391746B2 (en) | 2008-06-24 |
TW200610300A (en) | 2006-03-16 |
CN1716894B (en) | 2010-04-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7391746B2 (en) | Power saving method in wireless LAN system for permitting terminal station to promptly transition to doze state by transmitting empty data frame | |
CN101305624B (en) | System and method for detecting an unlicensed mobile alliance (UMA) service in GSM wireless communication networks | |
US8161302B2 (en) | Method and apparatus for data transmission in wireless local access network and system therefor | |
US20060079232A1 (en) | Wireless LAN handover method, wireless terminal, program product for use in the wireless terminal, and wireless communications system | |
US20030185170A1 (en) | System and method for asynchronous and communications employing direct indirect access protocols | |
TWI498023B (en) | Communications apparatus and method for reducing power consumption of a communications apparatus in wlan system | |
US8116329B2 (en) | Relay station, base station, power management method, and computer readable medium thereof for use in a wireless mesh network | |
KR102404017B1 (en) | State switching method and apparatus | |
US20080045159A1 (en) | Communication Apparatus and Communication Method | |
CN110089164A (en) | The energy-saving mode of improved wireless device | |
US11218962B2 (en) | Wireless communication method and wireless communications device | |
US8559366B2 (en) | Method of communication, emitter and receiver stations and associated computer programs | |
EP1503545A2 (en) | Method and apparatus for controlling power consumption of stations on CSMA/CA-based wireless lan | |
US20160119864A1 (en) | Method and apparatus for connecting portable terminal to wlan | |
JP3708095B2 (en) | Wireless communication apparatus and wireless communication method | |
US8953568B2 (en) | Roaming method and apparatus for terminals in wireless local area network | |
CN110475321B (en) | Power-saving optimization method and device for wireless local area network (AP) | |
US20100054166A1 (en) | Apparatus and method for controlling idle mode of mobile station in a wireless communication system | |
JP4670457B2 (en) | Wireless LAN terminal, wireless LAN system, and state transition method | |
US8054771B2 (en) | Method and system for adding a new connection identifier to an existing power save class | |
US8396017B2 (en) | Apparatus and method for filtering broadcast message | |
CN112385275B (en) | Client device, network access node, and method for beam management in power saving state | |
KR20070037866A (en) | Method for power efficiency management in the wireless lan | |
KR20090047597A (en) | Apparatus and method for power saving mode support in broadband wireless access system | |
JP2008048429A (en) | Method for saving power in wireless lan, base station, terminal station, wireless lan system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: NEC CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MORIMOTO, SHINICHI;KUROKAWA, HIDEKI;OMORI, YOUKO;REEL/FRAME:020856/0110 Effective date: 20050613 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |