OPERATING IN POWER SAVE MODE

• US 20170111865A1
• Filed: 12/26/2016
• Published: 04/20/2017
• Est. Priority Date: 06/27/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Techflux, Ltd.
• Inventors: SEOK, Yong H.
• Granted Patent: US 10,420,030 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04W 28/0221 power availability or consumption
• CPC Class Codes: H04W 28/0268 using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] negotiating SLA or negotiating QoS H04W28/24
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/0235 where the received signal is a power saving command
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/0808 using carrier sensing, e.g. carrier sense multiple access [CSMA]
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 80/02 Data link layer protocols
• CPC Class Codes: H04W 80/08 Upper layer protocols network arrangements or communication protocols for networked applications H04L67/00
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method for operating in a power save mode for a wireless local area network and a device using the same are provided. After waking up, a device receives a frame via a wireless medium to determine that the wireless medium is busy. If a decoding of the frame in a medium access control (MAC) layer is unsuccessful but a decoding of the frame in a physical layer is successful, the device determines an Interframe space (IFS) to defer an access of the wireless medium.

Claims

1. A method for operating in a power save mode for a wireless local area network, the method comprising:

transitioning, by a station, from a doze state to an awake state;

receiving, by the station in the awake state, a frame via a wireless medium to determine whether the wireless medium is busy; and

if a decoding of the frame in a medium access control (MAC) layer is unsuccessful but a decoding of the frame in a physical layer is successful, determining, by the station in the awake state, an Interframe space (IFS) to defer an access of the wireless medium.

2. The method of claim 1, wherein the IFS is a Distributed coordination function (DCF) Interframe Space (DIFS) if the type of the response frame is identified.

3. The method of claim 2, wherein the IFS is an Extended Interframe space (EIFS) that is longer than the DIFS if the type of the response frame is not identified.

4. The method of claim 1, wherein a type of the response frame is identified by a signal field in a physical header of the frame.

5. The method of claim 4, wherein the type of the response frame is identified if the signal field includes a response indication indicating a type of an expected response.

6. The method of claim 4, wherein the type of the response frame is not identified if the signal field does not include the response indication.

7. The method of claim 1, wherein the IFS is an EIFS if a decoding of the frame in the physical layer is unsuccessful.

8. The method of claim 1, wherein the IFS is a DIFS if a decoding of the frame both in the physical layer and in the MAC layer is successful.

9. A device configured for operating in a power save mode for a wireless local area network, the device comprising:

a radio frequency module configured to transmit and receive radio signals; and

a processor operatively coupled with the radio frequency module and configured to;

transition from a doze state to an awake state;

instruct the radio frequency module to receive a frame via a wireless medium to determine that the wireless medium is busy; and

determine an Interframe space (IFS) to defer an access of the wireless medium if a decoding of the frame in a medium access control (MAC) layer is unsuccessful but a decoding of the frame in a physical layer is successful.

10. The device of claim 9, wherein the IFS is a Distributed coordination function (DCF) Interframe Space (DIFS) if the type of the response frame is identified.

11. The device of claim 10, wherein the IFS is an Extended Interframe space (EIFS) that is longer than the DIFS if the type of the response frame is not identified.

12. The device of claim 9, wherein a type of the response frame is identified by a signal field in a physical header of the frame.

13. The device of claim 12, wherein the type of the response frame is identified if the signal field includes a response indication indicating a type of an expected response.

14. The device of claim 12, wherein the type of the response frame is not identified if the signal field does not include the response indication.

15. The device of claim 9, wherein the IFS is an EIFS if a decoding of the frame in the physical layer is unsuccessful.

16. The device of claim 9, wherein the IFS is a DIFS if a decoding of the frame both in the physical layer and in the MAC layer is successful.