Method and apparatus for transmitting a frame in a wireless RAN system

• US 8,848,680 B2
• Filed: 12/03/2010
• Issued: 09/30/2014
• Est. Priority Date: 12/03/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lee, Dae Won, Kang, Byeong Woo, Noh, Yu Jin, Kim, Bong Hoe, Seok, Yong Ho
• Primary Examiner(s): Zhao, Wei
• Application Number:
  US13/318,019
• Publication Number:
  US 20120044925A1
• Time in Patent Office: 1,397 Days
• Field of Search: 370/338, 455/517
• US Class Current: 370/338
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/0241 where no transmission is received, e.g. out of range of the transmitter
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 80/02 Data link layer protocols
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02B 70/30 Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

There is provided a method and apparatus for transmitting a frame which is performed by a transmission STA in a WLAN system. The method of transmitting a frame according to the present invention includes generating an MAC Protocol Data Unit (MPDU) to be transmitted to a target station, generating a PLCP Protocol Data Unit (PPDU) by attaching a Physical Layer Convergence Procedure (PLCP) header to the MPDU, and transmitting the PPDU to the target station. The PLCP header comprises a partial Association ID (AID) of the target station.

Claims

1. A method of processing a frame by a mobile station in a wireless local area network system, the method comprising:

receiving, by the mobile station from an access point, information about a station identifier having a first length and identifying the mobile station;

receiving, by the mobile station from the access point, a first Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU) including a first very High Throughput Signal (VHT-SIG) field and a first PLCP Service Data Unit (PSDU); and

transmitting, by the mobile station to the access point, a second PPDU including a second VHT-SIG field and a second PSDU,

wherein the first VHT-SIG field includes a class type and a first identifier field, the class type being set to a first value indicating that the first PPDU is destined to the mobile station, the first identifier field indicating a partial identifier formed from the station identifier and having a second length shorter than the first length, and

wherein the second VHT-SIG field includes a second class type and a second identifier field, the second class type being set to a second value indicating that the second PPDU is destined to the access point, the second identifier field indicating a part of a Basic Service Set Identifier (BSSID) identifying the access point.

2. The method of claim 1, wherein the first PPDU is received and the second PPDU is transmitted by adapting single-user multiple input multiple output (SU-MIMO).

3. The method of claim 1, wherein the first value is different from the second value.

4. The method of claim 1, wherein the first length is 16 bits and the second length is 9 bits.

5. The method of claim 1, wherein the station identifier includes an association identifier that is assigned to the mobile station during an association procedure with the access point.

6. A mobile station comprising:

a transceiver; and

a processor functionally connected to the transceiver and configured to;

instruct the transceiver to receive, from an access point, information about a station identifier having a first length and identifying the mobile station;

instruct the transceiver to receive, from the access point, a first Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU) including a first Very High Throughput Signal (VHT-SIG) field and a first PLCP Service Data Unit (PSDU); and

instruct the transceiver to transmit, to the access point, a second PPDU including a second VHT-SIG field and a second PSDU,

wherein the first VHT-SIG field includes a class type and a first identifier field, the class type being set to a first value indicating that the first PPDU is destined to the mobile station, the first identifier field indicating a partial identifier formed from the station identifier and having a second length shorter than the first length, and

wherein the second VHT-SIG field includes a second class type and a second identifier field, the second class type being set to a second value indicating that the second PPDU is destined to the access point, the second identifier field indicating a part of a Basic Service Set Identifier (BSSID) identifying the access point.

7. The mobile station of claim 6, wherein the first length is 16 bits and the second length is 9 bits.

8. The mobile station of claim 6, wherein the station identifier includes an association identifier that is assigned to the mobile station during an association procedure with the access point.

9. A method for transmitting a frame by an access point in a wireless local area network system, the method comprising:

transmitting, by the access point to a mobile station, information about a station identifier having a first length and identifying the mobile station;

transmitting, by the access point to the mobile station, a first Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU) including a first Very High Throughput Signal (VHT-SIG) field and a first PLCP Service Data Unit (PSDU); and

receiving, by the access point from the mobile station, a second PPDU including a second VHT-SIG field and a second PSDU,

wherein the first VHT-SIG field includes a class type and a first identifier field, the class type being set to a first value indicating that the first PPDU is destined to the mobile station, the first identifier field indicating a partial identifier formed from the station identifier and having a second length shorter than the first length, and

wherein the second VHT-SIG field includes a second class type and a second identifier field, the second class type being set to a second value indicating that the second PPDU is destined to the access point, the second identifier field indicating a part of a Basic Service Set Identifier (BSSID) identifying the access point.

10. An access point comprising:

a transceiver; and

a processor functionally connected to the transceiver and configured to;

instruct the transceiver to transmit, to a mobile station, information about a station identifier having a first length and identifying the mobile station;

instruct the transceiver to transmit, to the mobile station, a first Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU) including a first Very High Throughput Signal (VHT-SIG) field and a first PLCP Service Data Unit (PSDU); and

instruct the transceiver to receive, from the mobile station, a second PPDU including a second VHT-SIG field and a second PSDU,

wherein the first VHT-SIG field includes a class type and a first identifier field, the class type being set to a first value indicating that the first PPDU is destined to the mobile station, the first identifier field indicating a partial identifier formed from the station identifier and having a second length shorter than the first length, and

wherein the second VHT-SIG field includes a second class type and a second identifier field, the second class type being set to a second value indicating that the second PPDU is destined to the access point, the second identifier field indicating a part of a Basic Service Identifier (BSSID) identifying the access point.