Wireless data communication system having power saving function
First Claim
1. A method of operating a wireless data communication system including a plurality of wireless stations, comprising the steps of:
- broadcasting synchronizing messages from a selected station of the plurality of stations;
identifying which of a number of non-selected stations of the plurality of stations are to receive data messages by transmitting traffic indicator information from the selected station, wherein at least two non-selected stations were identified in the identifying step;
operating the non-selected stations in an awake state of relatively high power consumption during the broadcasting step and the identifying step;
changing the operating state of non-selected stations 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 is performed;
maintaining all non-selected stations that were identified in the identifying step in the 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 the non-selected stations which were identified in the identifying steps transmitting all data messages exchanged between the non-selected stations via the selection selected station;
including in the synchronizing messages destination identifying portions identifying non-selected stations that are to receive data messages;
including in the synchronizing messages a count portion identifying the number of data messages to be transmitted to the respective non-selected stations that are to receive data messages; and
returning the non-selected stations to the doze state after the respective number of data messages have been received.
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Accused Products
Abstract
A wireless data communication system is operable in a power saving mode wherein stations are synchronized to be in an awake state to receive synchronizing messages (TIM, PSYNC) and traffic indicator information and are changed to a doze state if they are not to receive data messages. In one embodiment all stations (20) communicate via a base station access point (16), which broadcasts synchronizing messages (TIM) at regular intervals identifying stations (20) that are to receive data messages. In another embodiment all stations (220) communicate directly with one another, one station assumes the role of a master station and broadcasts synchronizing messages (PSYNC), and stations (220) desiring to transmit data messages transmit traffic indicator messages (PTIM) to the appropriate destination stations (220), in a synchronized awake period just before the next synchronizing message (PSYNC) is expected to arrive.
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Citations
179 Claims
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1. A method of operating a wireless data communication system including a plurality of wireless stations, comprising the steps of:
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broadcasting synchronizing messages from a selected station of the plurality of stations;
identifying which of a number of non-selected stations of the plurality of stations are to receive data messages by transmitting traffic indicator information from the selected station, wherein at least two non-selected stations were identified in the identifying step;
operating the non-selected stations in an awake state of relatively high power consumption during the broadcasting step and the identifying step;
changing the operating state of non-selected stations 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 is performed;
maintaining all non-selected stations that were identified in the identifying step in the 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 the non-selected stations which were identified in the identifying steps transmitting all data messages exchanged between the non-selected stations via the selection selected station;
including in the synchronizing messages destination identifying portions identifying non-selected stations that are to receive data messages;
including in the synchronizing messages a count portion identifying the number of data messages to be transmitted to the respective non-selected stations that are to receive data messages; and
returning the non-selected stations to the doze state after the respective number of data messages have been received. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless data communication system, comprising:
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a selected wireless data communication station having a synchronizing timing means adapted to control transmission of synchronizing messages by said selected station;
means for transmitting traffic indicator information, in association with the synchronizing messages, that identify data message destinations;
a number of non-selected wireless data communication stations each having a switching means, a power supply, and a station transceiver means, wherein the switching means is adapted to control the power supply which is supplied to the station transceiver means so that the non-selected stations are controlled to be in an awake state of relatively high power consumption to receive the synchronizing messages and the traffic indicator messages, and following receipt of the synchronizing messages and the traffic indicator information (1) 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;
wherein said selected station is an access point communicating with a backbone LAN, and further wherein the synchronizing messages include destination identifying portions identifying stations that are to receive data messages; and
wherein the synchronizing messages include count information identifying the number of data messages to be transmitted to the respective non-selected stations, and further wherein the switching means is controlled to return the respective non-selective non-selected stations to the doze state when the specified number of data messages have been received. - View Dependent Claims (8, 9)
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10. A method of operating a wireless data communication system including a plurality of wireless data communication stations communicating directly in an ad-hoc network, wherein at least one of the plurality of wireless data communication stations acts as a master station and the remainder of the plurality of wireless data communication stations act as slave stations, said method comprising:
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broadcasting a synchronizing message by the master station in accordance with a synchronization timer, wherein the slave stations remain in an awake state;
entering a doze state by the slave stations once the synchronizing message from the master station is received;
transmitting a traffic message by a slave station that has messages to broadcast, if the slave station is in the awake state;
wherein the traffic message is stored in a buffer of the slave station that has messages to broadcast and the traffic message is transmitted to all stations to which the slave station wishes to transmit, wherein a holdover timer ensures the slave station remains in the awake state until all the message are broadcast. - View Dependent Claims (11, 12, 13)
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14. A wireless data communication system including a plurality of wireless data communication stations communicating directly in an ad-hoc network, wherein at least one of the plurality of wireless data communication stations acts as a master station and the remainder of the plurality of wireless data communication stations act as slave stations, wherein said system:
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said master station broadcasts a synchronizing message in accordance with a synchronization timer, wherein the slave stations remain in an awake state;
said slave stations enter a doze state once the synchronizing message from the master station is received;
a slave station than has messages to broadcast transmits a traffic message, if the slave station is in the awake state;
wherein the traffic message is stored in a buffer of the slave station that has messages to broadcast and the traffic message is transmitted to all stations to which the slave station wishes to transit, wherein a holdover timer ensures the slave station remains in the awake state until all the message are broadcast. - View Dependent Claims (15, 16, 17)
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18. A method of operating a wireless data communication system including a plurality of wireless stations, comprising the steps of:
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broadcasting synchronizing messages from a selected station of the plurality of stations;
identifying which of a number of non-selected stations of the plurality of stations are to receive data messages by transmitting traffic indicator information from the selected station, wherein at least two non-selected stations were identified in the identifying step;
operating the non-selected stations in an awake state of relatively high power consumption during the broadcasting step and the identifying step;
changing the operating state of non-selected stations 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 is performed;
maintaining all non-selected stations that were identified in the identifying step in the 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 the non-selected stations which were identified in the identifying step;
transmitting all data messages exchanged between the non-selected stations via the selected station;
including in the synchronizing messages destination identifying portions identifying non-selected stations that are to receive data messages;
further including in the synchronizing messages header portions and broadcast message indicator portions to be transmitted to the respective non-selected stations that are to receive data messages; and
returning the non-selected stations to the doze state. - View Dependent Claims (19, 20, 21, 133, 134, 158, 159)
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22. A wireless data communication system, comprising:
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a selected wireless data communication station having a synchronizing timer adapted to control transmission of synchronizing messages by said selected station, wherein the selected station is adapted to transmit traffic indicator information, in association with the synchronizing messages, that identify data message destinations; and
a number of non-selected wireless data communication stations each having a switching device, a power supply, and a station transceiver, wherein the switching device is adapted to control the power supply which is applied to the station transceiver so that the non-selected stations are controlled to be in an awake state of relatively high power consumption to receive the synchronizing messages and the traffic indicator information, and following receipt of the synchronizing messages and the traffic indicator information (1) 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 information;
wherein said selected station is an access point, and further wherein the synchronizing messages include destination identifying portions identifying stations that are to receive date messages; and
wherein the synchronizing messages further include header portions and broadcast message indicator portions to be transmitted to the respective non-selected stations, and further wherein the switching device is controlled to return the respective non-selected stations to the doze state. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 119, 135, 136, 160, 161)
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31. A method of operating a mobile wireless station, comprising the steps of:
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receiving periodically transmitted synchronizing messages broadcast from an access point, the synchronizing messages including destination identifying portions, header portions and broadcast message indicator portions;
determining whether the mobile wireless station is to receive a data message by receiving traffic indicator information transmitted from the access point;
operating the mobile wireless station in an awake state of relatively high power consumption during the receiving step and the determining step;
changing the operating state of the mobile wireless station of a doze state to relatively low power consumption after the receiving step and the determining step are performed if the mobile wireless station is not to receive a data message; and
maintaining the operating state of both transmitter and receiver functions of the mobile wireless station in the awake state for at least a time period beginning immediately after completion of the operating step so that one or more data massages are able to be transmitted to the mobile wireless station if the mobile wireless station is to receive a data message, wherein;
the mobile wireless station receives one or more data messages via the access point; and
the mobile wireless station returns to the doze state after receiving the one or more data messages via the access point before receiving another synchronization message. - View Dependent Claims (32, 33, 120, 137, 162)
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34. A mobile wireless station, comprising:
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a station transceiver that receives and transmits messages; and
a switching device that can switch the mobile wireless station between an awake state of relatively high power consumption so that the station transceiver is capable of receiving messages, and a doze state of relatively low power consumption, wherein the switching device causes the mobile wireless station to be in an awake stage to receive periodically transmitted synchronizing messages containing traffic indicator information from an access point, wherein the synchronizing messages further include header portions, broadcast message indicator portions, and destination identifying portions, and wherein the switching device causes the mobile wireless station to be in the doze state following receipt of the synchronizing messages if the traffic indicator information indicates that no data messages are to be transmitted by the access point to the mobile wireless station, and wherein the switching device causes both transmitter and receiver functions of the mobile wireless station to remain in the awake state for a time period beginning immediately after receiving the synchronizing messages and the traffic indicator information if the traffic indicator information indicates that data messages are to be transmitted by the access point to the mobile wireless station. - View Dependent Claims (35, 36, 37, 38, 39, 121, 138, 163, 164)
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40. A mobile wireless station, comprising:
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a station transceiver that receives and transmits messages; and
a switching device that can switch the mobile wireless station between an awake state of relatively high power consumption so that the station transceiver is capable of receiving messages, and a doze state of relatively low power consumption, wherein the switching device causes the mobile wireless station to be in an awake state to receive periodically transmitted synchronizing messages containing traffic indicator information from an access point, wherein the synchronizing messages further include header portions, broadcast message indicator portions, and destination identifying portions, and wherein the switching device causes the mobile wireless station to be in the doze state following receipt of the synchronizing messages if the traffic indicator information indicates that no data messages are to be transmitted by the access point to the mobile wireless station, and wherein the switching device causes both transmitter and receiver functions of the mobile wireless station to remain in the awake state for a time period beginning immediately after receiving the synchronizing messages and the traffic indicator information if the traffic indicator information indicates that data messages are to be transmitted by the access point to the mobile wireless station. - View Dependent Claims (41, 42, 43, 44, 45, 122, 139, 165, 166)
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46. A method of operating a wireless data communication system including a plurality of wireless stations, comprising the steps of:
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broadcasting synchronizing messages from a selected station of the plurality of stations;
identifying which of a number of non-selected stations of the plurality of stations are to receive data messages by transmitting traffic indicator information from the selected station, wherein at least two non-selected stations were identified in the identifying step;
operating the non-selected stations in an awake state of relatively high power consumption during the broadcasting step and the identifying step;
changing the operating state of non-selected stations 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 is performed;
maintaining all non-selected stations that were identified in the identifying step in the 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 the non-selected stations which were identified in the identifying steps transmitting all data messages exchanged between the non-selected stations via the selected station;
including in the synchronizing messages destination identifying portions identifying non-selected stations that are to receive data messages;
further including in the synchronizing messages header portions and broadcast message indicator portions, to be transmitted to the respective non-selected that are to receive data messages; and
returning the non-selected stations to the doze state after indicating such a mode change to the selected station. - View Dependent Claims (140, 141, 167, 168)
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47. A wireless data communication system, comprising:
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a selected wireless data communication station having a synchronizing timer adapted to control transmission of synchronizing messages by said selected station, wherein the selected station is adapted to transmit traffic indicator information, in association with the synchronizing messages, that identify data message destinations; and
a number of non-selected wireless data communication stations each having a switching device, a power supply, and a station transceiver, wherein the switching device is adapted to control the power supply which is applied to the station transceiver so that the non-selected stations are controlled to be in an awake state of relatively high power consumption to receive the synchronizing messages and the traffic indicator information, and following receipt of the synchronizing messages and the traffic indicator information (1) 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 information;
wherein said selected station is an access point, and further wherein the synchronizing messages include destination identifying portions identifying stations that are to receive data messages; and
wherein the synchronizing messages further include header portions and broadcast message indicator portions, to be transmitted to the respective non-selected stations that are to receive data messages, and further wherein the switching divide is controlled to return the respective non-selected stations to the doze state after indicating such a mode change to the selected station. - View Dependent Claims (48, 49, 50, 51, 52, 123, 142, 143, 169, 170)
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53. A method of operating a mobile wireless station, comprising the steps of:
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receiving periodically transmitted synchronizing messages broadcast from an access point;
determining whether the mobile wireless station is to receive a data message by receiving traffic indicator information transmitted from the access point;
operating in an awake state of relatively high power consumption during the receiving step and the determining step;
changing the operating state to a doze state of relatively low power consumption after the receiving step and the determining step are performed if the mobile wireless station is not to receive a data message; and
maintaining the operating state of both transmitter and receive functions of the mobile wireless station in the 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 the mobile wireless station if the mobile wireless station is to receive a data message wherein the mobile wireless station receives one or more data messages via the access point and remains in the awake state at least until the next synchronization message is received. - View Dependent Claims (124, 144)
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54. A mobile wireless station, comprising:
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a station transceiver that receives and transmits messages; and
a switching device, that can switch the mobile wireless station between an awake state of relatively high power consumption so that the station transceiver is capable of receiving messages, and a doze state of relatively low power consumption wherein the switching device causes the mobile wireless station to be in an awake state to receive periodically transmitted synchronizing messages containing traffic indicator information from an access point;
wherein the switching device causes the mobile wireless station to be in the doze state following receipt of the periodically transmitted synchronizing messages if the traffic indicator information indicates that no data messages are to be transmitted by the access point to the mobile wireless station and wherein the switching device causes both transmitter and receiver functions of the mobile wireless station to remain in an awake state until the next synchronizing message is received if the mobile wireless station has received a message in the current synchronizing period. - View Dependent Claims (55, 56, 57, 58, 59, 125, 145)
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60. A mobile wireless station, comprising:
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a station transceiver that receives and transmits messages; and
a switching device, that can switch the mobile wireless station between an awake state of relatively high power consumption so that the station transceiver is capable of receiving messages, and a doze state of relatively low power consumption wherein the switching device causes the mobile wireless station to be in an awake state to receive periodically transmitted synchronizing messages containing traffic indicator information from an access point;
wherein the switching device causes the mobile wireless station to be in the doze state following receipt of the periodically transmitted synchronizing messages if the traffic indicator information indicates that no data messages are to be transmitted by the access point to the mobile wireless station and wherein the switching device causes both transmitter and receiver functions of the mobile wireless station to remain in an awake state until the next synchronizing message is received if the mobile wireless station has received a message in the current synchronizing period. - View Dependent Claims (61, 62, 63, 64, 65, 126, 146)
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66. A method of operating a wireless data communication system including a plurality of wireless stations, comprising the steps of:
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broadcasting synchronizing messages from a selected station of the plurality of stations;
identifying which of a number of non-selected stations of the plurality of stations are to receive data messages by transmitting traffic indicator information from the selected station, wherein at least two non-selected stations were identified in the identifying step;
operating the non-selected stations in an awake state of relatively high power consumption during the broadcasting step and the identifying step;
changing the operating state of non-selected stations 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 is performed;
maintaining all non-selected stations that were identified in the identifying step in the 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 the non-selected stations which were identified in the identifying steps transmitting all data messages exchanged between the non-selected stations via the selected station;
including in the synchronizing messages destination identifying portions identifying non-selected stations that are to receive data messages;
further including in the synchronizing messages message indicator portions indicating that additional messages await transmission to the respective non-selected stations that are to receive data messages; and
returning the non-selected stations to the doze state when the respective non-selected stations that are to receive data messages determine that no additional data messages await. - View Dependent Claims (147, 148, 171)
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67. A method of operating a wireless data communication system, comprising the steps of:
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broadcasting periodically transmitted synchronizing messages from an access point to a plurality of mobile stations, operating the plurality of mobile stations in an awake state of relatively high power consumption during the broadcasting step;
identifying which of the plurality of mobile stations are to receive data messages;
changing the operating state of the mobile stations that were not identified to a doze state of relatively low power consumption after the broadcasting step and identifying steps are performed;
maintaining the mobile stations that were identified in the 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 the mobile stations that were identified;
transmitting all data messages for the mobile stations that were identified via the access point;
returning the mobile stations that were identified to the doze state when the mobile stations that were identified determine that no additional data messages await, wherein both transmitter and receiver functions of each identified station are maintained in the awake state for at least the time period beginning immediately after the completion of the operating step. - View Dependent Claims (68, 69, 70, 71, 72, 127, 149, 172)
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73. A wireless data communication system, comprising:
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a selected wireless data communication station having a synchronizing timer adapted to control transmission of synchronizing messages by said selected station, wherein the selected station is adapted to transmit traffic indicator information, in association with the synchronizing messages, that identify data messages destinations; and
a number of non-selected wireless data communication stations each having a switching device, a power supply, and a station transceiver, wherein the switching device is adapted to control the power supply which is applied to the station transceiver so that the non-selected stations are controlled to be in an awake state of relatively high power consumption to receive the synchronizing messages and the traffic indicator information, and following receipt of the synchronizing messages and the traffic indicator information (1) 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 information;
wherein said selected station is an access point, and further wherein the synchronizing messages include destination identifying portions identifying stations that are to receive data messages; and
wherein the synchronizing messages message indicator portions indicating the additional messages await transmission to the respective non-selected stations, and further wherein the switching device is controlled to return the respective non-selected station to the doze state when the respective non-selected station that is to receive one or more data messages determines that no additional data messages await. - View Dependent Claims (74, 75, 76, 77, 78, 128, 150, 151, 173)
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79. A wireless data communication system, comprising:
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an access point, broadcasting periodically transmitted synchronizing messages;
a plurality of mobile stations, receiving the periodically transmitted synchronizing messages broadcast by the access point, the plurality of mobile stations operating in an awake state of relatively high power consumption during broadcasting by the access point, the plurality of mobile stations identifying which are to receive data messages, wherein the plurality of mobile stations that were not identified change to a doze state of relatively low power consumption and the plurality of mobile stations that were identified stay in the awake state for a time period beginning immediately after receiving each synchronizing message so that one or more data messages are able to be transmitted to the plurality of mobile stations that were identified;
the access point transmitting all data messages for the plurality of mobile stations that were identified;
the mobile stations that were identified returning to the doze state when the mobile stations that were identified determine that no additional data messages await; and
both transmitter and receiver functions of each identified mobile station stay in the awake state for the time period beginning immediately after receiving each synchronizing message. - View Dependent Claims (80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 129, 152, 174)
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90. A method of operating a mobile wireless station, comprising the steps of:
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receiving synchronizing messages broadcast from an access point, the synchronizing messages including message indicator portions indicating that additional messages await transmission to the mobile wireless station;
determining whether the mobile wireless station is to receive a data message by receiving and processing traffic indicator information from the access point;
operating in an awake state of relatively high power consumption during the receiving step and the determining step;
changing the operating state to a doze state of relatively low power consumption after the receiving step and the determining step are performed if the mobile wireless station is not to receive a data message; and
maintaining the operating state of both transmitter and receiver functions of the mobile wireless station in the 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 the mobile wireless station if the mobile wireless station is to receive a data message, wherein the mobile wireless station receives one or more data messages from the access point and returns to the doze state when the mobile wireless station determines that no additional data messages await. - View Dependent Claims (130, 153, 175)
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91. A method of operating a mobile wireless station, comprising the steps of:
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receiving periodically transmitted synchronizing messages from an access point, operating in an awake state of relatively high power consumption during the receiving step;
identifying whether the mobile wireless station is to receive data messages;
changing the operating state of the mobile wireless station to doze stage of relatively low power consumption after the receiving step and identifying steps are performed if the mobile wireless station is not to receive a data message; and
maintaining both transmitter and receiver functions of the mobile wireless station in the 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 the mobile wireless station if the mobile wireless station is to receive a data message, wherein the mobile wireless station receives one or more data messages via the access point and returns to the doze state when the mobile wireless station determines that no additional data messages await. - View Dependent Claims (92, 93, 94, 95, 96, 131, 154, 176)
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97. A mobile wireless station, comprising:
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a station transceiver adapted to receive and transmit messages; and
a switching device, adapted to control the power received by the station transceiver so that the mobile wireless station is controlled to be in an awake state of relatively high power consumption to receive synchronizing messages and traffic indicator information from an access point, wherein the synchronizing messages further include message indicator portions indicating that additional data messages await transmission to the mobile wireless station;
and following receipt of the synchronizing messages and the traffic indicator information, if the mobile wireless station has no data messages destined therefore, the switching device changes to a doze state of relatively low power consumption, and if the mobile wireless station has data messages destined therefore, the switching device maintains both transmitter and receiver functions of the mobile wireless station in the awake state for a time period beginning immediately after receiving the synchronizing messages and the traffic indicator information; and
wherein the switching device is controllable to return the mobile wireless station to the doze state when the mobile wireless station determines that no additional data messages await. - View Dependent Claims (98, 99, 100, 132, 155, 177)
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101. A mobile wireless station, comprising:
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a station transceiver that receives and transmits messages; and
a switching device that can switch the mobile wireless station between an awake state of relatively high power consumption so that the station transceiver is capable of receiving messages, and a doze state of relatively low power consumption, wherein the switching device causes the mobile wireless station to be in an awake state to receive periodically transmitted synchronizing messages, and wherein the switching device causes the mobile wireless station to be in the doze state following receipt of the synchronizing messages if no data messages are to be transmitted by an access point to the mobile wireless station, the switching device causes both transmitter and receiver functions of the mobile wireless station to remain in the awake state if data messages are to be transmitted by the access point to the mobile wireless station, and the switching device causes the mobile wireless station to return to the doze state when the mobile wireless station determines that no additional data messages await. - View Dependent Claims (102, 103, 104, 105, 106, 107, 108, 109, 156, 178)
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110. A mobile wireless station, comprising:
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a station transceiver that receives and transmits messages; and
switching device that can switch the mobile wireless station between an awake state of relatively high power consumption so that the station transceiver is capable of receiving messages, and a doze state of relatively low power consumption, wherein the switching device causes the mobile wireless station to be in an awake state to receive periodically transmitted synchronizing messages, and wherein the switching device causes the mobile wireless station to be in the doze state following receipt of the synchronizing messages if no data messages are to be transmitted by an access point to the mobile wireless station, the switching device causes both transmitter and receiver functions of the mobile wireless station to remain in the awake state if data messages are to be transmitted by the access point to the mobile wireless station, and the switching device causes the mobile wireless station to return to the doze state when the mobile wireless station determines that no additional data messages await. - View Dependent Claims (111, 112, 113, 114, 115, 116, 117, 118, 157, 179)
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Specification