METHOD AND APPARATUS FOR DATA TRANSMISSION IN WIRELESS LOCAL ACCESS NETWORK AND SYSTEM THEREFOR

• US 20090276646A1
• Filed: 04/10/2009
• Published: 11/05/2009
• Est. Priority Date: 05/02/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: Woo, Yong Ha
• Granted Patent: US 8,161,302 B2
• Time in Patent Office: Days
• US Class Current: 713/310
• CPC Class Codes: H04W 52/028 switching on or off only a part of the equipment circuit blocks
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

An Apparatus, method, and system for transmitting data in a Wireless Local Access Network (WLAN) in a power management state are provided. The method includes registering a standby state entrance to an Access Point (AP), switching to an active state at a period, determining whether transmission standby data exists in the AP, transmitting, if the transmission standby data exist in the AP, a standby state entrance frame notifying the entrance to the standby state to the AP, transmitting an active request signal requesting a switching to an active state to the CPU, transmitting a signal notifying standby state release to the AP if a signal notifying switch completion to an active state is received from the CPU after the active request signal is transmitted, and receiving transmission standby data from the AP.

Claims

1. A method for data transmission and reception in a portable terminal connected to an Access Point (AP) in a Wireless Local Access Network (WLAN), the method comprising:

transmitting, if transmission standby data exist in the AP in a state where a Central Processing Unit (CPU) is in a standby state, a standby state entrance frame notifying of entrance to the standby state to the AP;

switching the state of the CPU to an active state;

transmitting a frame notifying of standby state release to the AP; and

receiving the transmission standby data from the AP.

2. The method of claim 1, wherein the switching of the state of the CPU to the active state comprises:

transmitting an active request signal requesting a switch to an active state to the CPU when the standby state entrance frame is transmitted;

restoring, if the CPU receives the active request signal, a state of an Operating System (OS), stored when the CPU enters a standby state; and

transmitting a switch completion signal, indicative of being switched to the active state, if the state of the OS is stored in the CPU.

3. The method of claim 1, further comprising:

receiving part of the transmission standby data before the standby state entrance frame is transmitted to the AP;

evaluating information about CPU data required to be processed in the CPU; and

determining whether the received data correspond to the CPU data.

4. The method of claim 3, further comprising:

transmitting, if the received data correspond to the CPU data, the standby state entrance frame to the AP.

5. The method of claim 1, wherein:

the standby state entrance frame comprises a Media Access Control (MAC) frame; and

the frame notifying standby state release comprises at least one of a MAC frame and a Power Save Poll (PS-Poll) frame.

6. The method of claim 1, wherein the transmitting of the frame notifying of entrance to the standby state comprises:

switching the standby state to an active state at at least one of a beacon interval and a transmission period of a Delivery Traffic Indication Map (DTIM); and

determining whether transmission standby data exist in the AP.

7. The method of claim 3, wherein the information about CPU data comprises at least one of data information based on protocol types, data information based on sources, and data information based on destinations.

8. The method of claim 3, further comprising:

receiving, if the received data do not correspond to the CPU data, the transmission standby data from the AP, without transmitting an active request signal to the CPU.

9. An apparatus for data transmission and reception in a portable terminal connected to an Access Point (AP) in a Wireless Local Access Network (WLAN), the apparatus comprising:

a WLAN module for transmitting, if transmission standby data exist in the AP in a state where a Central Processing Unit (CPU) is in a standby state, a frame notifying of entrance to the standby state to the AP and for transmitting a signal requesting a switch to an active state to the CPU; and

the CPU for processing data in an active state, for switching to one of a standby state and an active state according to whether there are data to be processed for a period of time, and for transmitting a signal notifying a state switch to the wireless LAN module.

10. The apparatus of claim 9, wherein the WLAN module receives the transmission standby data from the AP, after a frame notifying standby state release has been transmitted to the AP, when the CPU has switched its state to an active state.

11. The apparatus of claim 9, wherein the CPU transmits information about CPU data required to be processed by the CPU to the wireless LAN module when it transmits the signal notifying of a standby state entrance to the wireless LAN module.

12. The apparatus of claim 11, wherein the WLAN module transmits the standby state entrance frame to the AP if transmission standby data in the AP correspond to the CPU data.

13. The apparatus of claim 12, wherein the CPU data comprises at least one of data information based on protocol types, data information based on sources, and data information based on destinations.

14. The apparatus of claim 9, wherein the wireless LAN module switches its state to an active state at a period and then determines whether transmission standby data exist in the AP.

15. The apparatus of claim 11, wherein the WLAN module receives part of the transmission standby data if the transmission standby data exist and determines whether the received data correspond to the CPU data.

16. The apparatus of claim 15, wherein the WLAN module further transmits the active request signal to the CPU if the received data correspond to the CPU data.

17. The apparatus of claim 9, wherein the CPU restores a state of an Operating System (OS), stored when it enters a standby state, if it receives a signal requesting a switch to the active state, and transmits the active switch completion signal to the WLAN module if the OS state has been restored.

18. The apparatus of claim 14, wherein the period includes at least one of a beacon interval and a transmission period of a delivery traffic indication map (DTIM).

19. The apparatus of claim 9, further comprising:

a storage unit for storing the state of the OS of the CPU when entering a standby state.

20. A system for transmitting data in a Wireless Local Access Network (WLAN), comprising:

an Access Point (AP); and

a plurality of portable terminals,

wherein the AP transmits data to the plurality of portable terminals in the WLAN, stores data for a portable terminal in a standby state, and transmits data to the portable terminal when the portable terminal releases its standby state and the portable terminal is connected to the AP, determines whether transmission standby data exist in the AP while it is in a standby state, and transmits a frame notifying of entrance to a standby state to the AP if the data exist.

21. The system of claim 20, wherein the portable terminal transmits a frame notifying of standby state release to the AP if the CPU switches a standby state to an active state and receives the transmission standby data from the AP.