Method and apparatus for transmitting and receiving a frame supporting a short MAC header in wireless LAN system

• US 9,843,558 B2
• Filed: 10/07/2013
• Issued: 12/12/2017
• Est. Priority Date: 10/12/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seok, Yongho
• Primary Examiner(s): Nguyen, Phuongchau Ba
• Application Number:
  US14/435,068
• Publication Number:
  US 20150271137A1
• Time in Patent Office: 1,527 Days
• Field of Search: 370230, 370328, 370338
• CPC Class Codes: H04L 2101/622 Layer-2 addresses, e.g. medium access control [MAC] addresses
• CPC Class Codes: H04L 63/0876 based on the identity of the terminal or configuration, e.g. MAC address, hardware or software configuration or device fingerprint
• CPC Class Codes: H04L 63/123 received data contents, e.g. message integrity
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04L 69/324 in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04W 12/03 Protecting confidentiality, e.g. by encryption
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/065 using assembly or disassembly of packets
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 52/0209 in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus for transmitting and receiving a frame supporting a short MAC header in a wireless LAN (WLAN) system are disclosed. A method for managing a sequence number in a wireless LAN (WLAN) system includes: transmitting, by a first station (STA), a frame including a short MAC header to a second STA. One of a receiver address (RA) field and a transmitter address (TA) field contained in the short MAC header includes an associated identifier (AID) value according to whether a transmission direction of the frame is an uplink (UL) or downlink (DL) direction, and if the RA field includes the AID value, the sequence number for the frame is assigned based on a station (STA) MAC address identified by the AID value.

Claims

1. A method for managing a sequence number in a wireless LAN (WLAN) system, comprising:

receiving, by a second station (STA), a frame including a compressed MAC header from a first STA; and

checking, by the second STA, a corresponding cache to determine whether the frame is a duplicated frame,

wherein the compressed MAC header includes a receiver address (RA) field, a transmitter address (TA) field and a sequence control field,

wherein the sequence control field includes a sequence number value for the frame,

wherein when the frame is an uplink (UL) frame the TA field includes an associated identifier (AID) value,

wherein when the frame is a downlink (DL) frame the RA field includes the AID value,

wherein when the TA field includes the AID value, the corresponding cache is checked based on a STA MAC address identified by the AID value and the sequence number value, and

wherein when the frame is determined to be the duplicated frame, the STA MAC address identified by the AID value and the sequence number value contained in the compressed MAC header are respectively identical to an STA MAC address and a sequence number value of the corresponding cache.

2. The method according to claim 1, wherein a retry bit of the frame is set to 1.

3. The method according to claim 1, wherein:

if the frame is transmitted in UL direction, the receiver address (RA) field includes a Basic Service Set Identifier (BSSID), and the transmitter address (TA) field includes the AID value of the first STA.

4. The method according to claim 1, wherein the compressed MAC header includes a Frame Control field, an Address 1 field, an Address 2 field,

wherein the Address 1 field is the receiver address (RA) field, and

the Address 2 field is the transmitter address (TA) field.

5. A station (STA) for managing a sequence number in a wireless LAN (WLAN) system, comprising:

a transceiver that receives a frame including a compressed MAC header from another STA; and

a processor that checks a corresponding cache to determine whether the frame is a duplicated frame,

wherein the compressed MAC header including a receiver address (RA) field, a transmitter address (TA) field and a sequence control field,

wherein the sequence control field includes a sequence number value for the frame,

wherein when the frame is an uplink (UL) frame the TA field includes an associated identifier (AID) value,

wherein when the frame is a downlink (DL) frame the RA field includes the AID value,

wherein when the TA field includes the AID value, the corresponding cache is checked based on a STA MAC address identified by the AID value and the sequence number value, and

wherein when the frame is determined to be the duplicated frame, the STA MAC address identified by the AID value and the sequence number value contained in the compressed MAC header are respectively identical to an STA MAC address and a sequence number value of the corresponding cache.