# US 8,787,284 B2 · Method and apparatus for transmitting frame in WLAN system

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- Number: US 8,787,284 B2
- Document ID: US8787284B2
- Status: Granted
- Kind: B2
- Application number: 13/318,014
- Filed: 2011-03-15
- Published: 2012-03-01
- Granted: 2014-07-22
- Earliest claimed: 2010-03-15
- Assignees: LG Electronics Inc.
- Applicants: Yu Jin Noh; Byeong Woo Kang; Dae Won Lee; Yong Ho Seok
- Inventors: Yu Jin Noh; Byeong Woo Kang; Dae Won Lee; Yong Ho Seok
- Web page: https://patentgrep.com/patent/US8787284B2

## CPC

- H04W 72/30: Resource management for broadcast services
- H04L 12/189: {in combination with wireless systems (selective distribution or broadcast in wireless communication networks H04W4/06)}
- H04W 4/00: Services specially adapted for wireless communication networks; Facilities therefor
- H04W 76/14: Direct-mode setup
- H04W 84/12: WLAN [Wireless Local Area Networks]
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A method of transmitting a frame in a Wireless Local Area Network (WLAN) system, and which includes receiving, by a first station, information about an association identifier (AID) from an access point, the AID identifying the first station in the WLAN system; transmitting, by the first station, a DLS request frame to a second station; receiving, by the first station, a DLS response frame from the second station; generating, by the first station, a PPDU including a VHT-SIG field and a PSDU; and transmitting, by the first station, the PPDU to the second station via the direct link. Further, the VHT-SIG field includes identity information indicating a partial AID that is formed from the AID of the second station and has a length shorter than the length of the AID of the second station.

## Claims

### Claim 1

A method of transmitting a frame in a Wireless Local Area Network (WLAN) system, the method comprising:
receiving, by a first station, information about an association identifier (AID) from an access point, the AID identifying the first station in the WLAN system;
transmitting, by the first station, a Direct Link Setup (DLS) request frame to a second station to request a setup for a direct link with the second station, the DLS request frame including the AID of the first station;
receiving, by the first station, a DLS response frame from the second station in response to the DLS request frame, the DLS response frame including an AID of the second station;
generating, by the first station, a Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU), the PPDU including a Very High Throughput-Signal (VHT-SIG) field and a PLCP Service Data Unit (PSDU); and
transmitting, by the first station, the PPDU to the second station via the direct link,
wherein the VHT-SIG field includes identity information indicating a partial AID that is formed from the AID of the second station and has a length shorter than the length of the AID of the second station.

### Claim 2 (depends on 1)

The method of claim 1, wherein the length of the AID of the second station is 16 bits and the length of the partial AID is 9 bits.

### Claim 3

An apparatus configured to operate in a Wireless Local Area Network (WLAN) system, the apparatus comprising:
a transceiver; and
a processor functionally coupled to the transceiver and
configured to:
receive, via the transceiver, information about an association identifier (AID) from an access point, the AID identifying the apparatus in the WLAN system;
transmit, via the transceiver, a Direct Link Setup (DLS) request frame to a station to request a setup for a direct link with the station, the DLS request frame including the AID of the apparatus;
receive, via the transceiver, a DLS response frame from the station in response to the DLS request frame, the DLS response frame including an AID of the station;
generate a Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU), the PPDU including a Very High Throughput-Signal (VHT-SIG) field and a PLCP Service Data Unit (PSDU); and
transmit, via the transceiver, the PPDU to the station via the direct link,
wherein the VHT-SIG field includes identity information indicating a partial AID that is formed from the AID of the station and has a length shorter than the length of the AID of the station.

### Claim 4 (depends on 3)

The apparatus of claim 3, wherein the length of the AID of the station is 16 bits and the length of the partial AID is 9 bits.

### Claim 5 (depends on 1)

The method of claim 1, wherein the VHT-SIG field further includes a reception target indicator indicating whether the PPDU is destined to the access point or not.

### Claim 6 (depends on 3)

The apparatus of claim 3, wherein the VHT-SIG field further includes a reception target indicator indicating whether the PPDU is destined to the access point or not.

### Claim 7

A method of transmitting a frame in a Wireless Local Area Network (WLAN) system, the method comprising:
receiving, by a second station, information about an association identifier (AID) from an access point, the AID identifying the second station in the WLAN system;
receiving, by the second station, a Direct Link Setup (DLS) request frame from a first station to request a setup for a direct link with the second station, the DLS request frame including an AID of the first station;
transmitting, by the second station, a DLS response frame to the first station in response to the DLS request frame, the DLS response frame including the AID of the second station;
generating, by the second station, a Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU), the PPDU including a Very High Throughput-Signal (VHT-SIG) field and a PLCP Service Data Unit (PSDU); and
transmitting, by the second station, the PPDU to the first station via the direct link,
wherein the VHT-SIG field includes identity information indicating a partial AID that is formed from the AID of the first station and has a length shorter than the length of the AID of the first station.

### Claim 8

An apparatus operated in a Wireless Local Area Network (WLAN) system, the apparatus comprising:
a transceiver; and
a processor functionally coupled to the transceiver and configured to:
receive, via the transceiver, information about an association identifier (AID) from an access point, the AID identifying the apparatus in the WLAN system;
receive, via the transceiver, a Direct Link Setup (DLS) request frame from a station to request a setup for a direct link with the station, the DLS request frame including an AID of the station;
transmit, via the transceiver, a DLS response frame to the station in response to the DLS request frame, the DLS response frame including the AID of the apparatus;
generate a Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU), the PPDU including a Very High Throughput-Signal (VHT-SIG) field and a PLCP Service Data Unit (PSDU); and
transmit, via the transceiver, the PPDU to the station via the direct link,
wherein the VHT-SIG field includes identity information indicating a partial AID that is formed from the AID of the station and has a length shorter than the length of the AID of the station.