EP0615364B1
Expired / Lapsed
EP
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Wireless data communication system having power saving function
Assignee: Nokia of America Corp
•
Filing: 1994-02-25
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Granted: 2001-01-03
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Expires: 2014-02-25
Abstract
No abstract record available.
Inventors
- 👤 Hendrik Van Bokhurst
- 👤 Albertus Maria G. Claessen
- 👤 Wilhelmus Josephus Diepstraten
- 👤 Johannes Petrus N. Haagh
- 👤 Hendrik Moelard
- 👤 Leo Monteban
- 👤 Rienk Mud
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 10:12
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/02; H04W52/0209; H04W52/0212; H04W52/0216; H04W88/00; H04W88/02; H04W88/022; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
203 words
A method of operating a wireless data communication system
including a plurality of wireless stations (16, 20, 220), characterized by the steps of:
broadcasting synchronizing messages (TIM, PSYNC) from a selected one of said
stations (16,220-1); identifying which of a number of non-selected stations of the
plurality of stations (20,220-2 to 220-4) are to receive data messages by transmitting
traffic indicator information in association with said synchronizing messages from the selected station, wherein at least two non-selected
stations were identified in the identifying step; operating the non-selected stations
(20,220-2 to 220-4) in an awake state of relatively high power consumption during the
broadcast step and the identifying step; changing the operating state of non-selected
stations (20,220-2 to 220-4) that were not identified in the identifying step to a doze
state of relatively low power consumption after the broadcasting step and the
identifying step are performed; and maintaining all non-selected stations (20,220-2 to
220-4) that were identified in the identifying step in said awake state for at least a time
period beginning immediately after completion of the operating step so that one or more
data messages are able to be transmitted to non-selected stations (20,220-2 to 220-4)
which were identified in the identifying step.
Claim 2
Dependent Claim
45 words
A method according to claim 1, including the steps of transmitting all
data messages exchanged between said non-selected stations (20) via said selected
station (16); and including in said synchronizing messages (TIM) destination
identifying portions identifying non-selected stations (20) that are to receive data
messages.
Claim 3
Dependent Claim
21 words
A method according to claim 2, wherein said selected station is an
access point (16) communicating with a wired LAN (12).
Claim 4
Dependent Claim
41 words
A method according to claim 2 or 3, including the step of maintaining
said non-selected stations (20) that are to receive data messages in said awake state at
least until the reception of a next one of said synchronizing messages (TIM).
Claim 5
Dependent Claim
62 words
A method according to claim 2 or 3, including the steps of including
in said synchronizing messages (TIM) a count portion identifying the number of data
messages to be transmitted to the respective non-selected stations (20) that are to
receive data messages; and returning said non-selected stations (20) to said doze state
after the respective number of data messages have been received.
Claim 6
Dependent Claim
45 words
A method according to claim 1, including the steps of transmitting
from the selected station (220-1) traffic indicator messages (PTIM) identifying the
source address of the selected station (220-1) and the destination addresses of each data
message to be sent from the selected station (220-1).
Claim 7
Dependent Claim
24 words
A method according to claim 6, wherein said traffic indicator
messages (PTIM) are transmitted when said selected station (220-1) is in said awake
state.
Claim 8
Independent Claim
47 words
A method according to any one of the preceding claims, including the
step of operating said non-selected stations (20,220-2 to 220-4) selectively in a power-save
mode wherein said doze states and said awake states alternate, or in a continuous-active
mode wherein said awake state is continuously effective.
Claim 9
Dependent Claim
190 words
A wireless data communication system, including a plurality of
wireless data communication stations (16,20,220), characterized in that a selected one of
said stations (16,220-1) includes a synchronizing timing means (62,250) adapted to
control the transmission of synchronizing messages (TIM,PSYNC) by the selected
station (16,220-1); in that means are provided adapted to transmit traffic indicator
information in association with said synchronizing messages (TIM, PSYNC); and in
that a number of non-selected stations (20,220-2 to 220-4) include switching means
(44,244) adapted to control the power supply applied to station transceiver means
(50,250), such that said number of non-selected stations (20,220-2 to 220-4) are
controlled to be in an awake state of relatively high power consumption to receive said
synchronizing messages (TIM, PSYNC) and said traffic indicator information and
following receipt of the synchronizing messages and the traffic indicator information (I)
any non-selected stations having no data messages destined therefor are changed to a
doze state of relatively low power consumption and (2) all non-selected stations having
data messages destined therefor are maintained in the awake state for a time period
beginning immediately after receiving the synchronizing messages and the traffic
indicator messages.
Claim 10
Dependent Claim
46 words
A wireless data communication system according to claim 9,
wherein said selected one of said stations (16) is an access point (16) communicating
with a backbone LAN (12), and said synchronizing messages (TIM) include destination
identification portions identifying stations (20) that are to receive data messages.
Claim 11
Dependent Claim
44 words
A wireless data communication system according to claim 10,
wherein the switching means (44) of non-selected stations identified to receive data
messages are controlled to remain in said awake state at least until a next one of said
synchronizing messages (TIM) has been received.
Claim 12
Dependent Claim
59 words
A wireless data communication system according to claim 10,
wherein said synchronizing messages (TIM) include count information identifying the
number of data messages to be transmitted to the respective non-selected stations (20),
and said switching means (44) is controlled to return the respective non-selected
stations (20) to the doze state when the specified number of messages have been
received.
Claim 13
Dependent Claim
39 words
A wireless data communication system according to claim 9,
wherein said selected stations (220-1) are adapted to transmit traffic indicator messages
(PTIM) identifying source and destination addresses for each data message to be sent
from the selected station (220-1).
References Cited (Backward Citations)
No citation records indexed.
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