# US 9,439,149 B2 · Method for power saving in wireless local area network and apparatus for the same

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- Number: US 9,439,149 B2
- Document ID: US9439149B2
- Status: Granted
- Kind: B2
- Application number: 14/866,195
- Filed: 2015-09-25
- Published: 2016-01-14
- Granted: 2016-09-06
- Earliest claimed: 2010-10-08
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Byeong Woo Kang; Dae Won Lee; Yong Ho Seok
- Web page: https://patentgrep.com/patent/US9439149B2

## CPC

- H04W 52/0235: {where the received signal is a power saving command}
- H04B 7/0452: Multi-user MIMO systems
- H04L 69/323: in the physical layer [OSI layer 1]
- H04W 52/02: Power saving arrangements
- H04W 52/0212: {managed by the network, e.g. network or access point is leader and terminal is follower}
- H04W 52/0219: {where the power saving management affects multiple terminals}
- H04W 52/0222: {in packet switched networks}
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- 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)
- H04B: TRANSMISSION
- 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 power saving in a wireless local area network, and a wireless apparatus therefore are discussed. The method according to one embodiment includes acquiring a transmission opportunity (TXOP), receiving a signal field, the signal field including a group identifier, a number indicator and a power saving indicator, the group identifier indicating a group of recipients, the number indicator indicating a number of spatial streams, the power saving indicator indicating that the transmitting device allows the wireless device to enter a doze state. The method according to the embodiment further includes entering the doze state until the end of the TXOP if the power saving indicator indicates an allowance of entering the doze state during the TXOP, the wireless device is a member of the group of recipients, and the number of spatial streams to be received by the wireless device is equal to zero.

## Claims

### Claim 1

A method of power saving in a wireless local area network, the method comprising:
acquiring, by a wireless device, a transmission opportunity (TXOP) from a transmitting device;
receiving, by the wireless device, a signal field from the transmitting device, the signal field including a group identifier, a number indicator and a power saving indicator, the group identifier indicating a group of recipients, the number indicator indicating a number of spatial streams for a corresponding recipient, the power saving indicator indicating that the transmitting device allows the wireless device to enter a doze state during the TXOP; and
entering, by the wireless device, the doze state until the end of the TXOP if:
the power saving indicator indicates an allowance of entering the doze state during the TXOP,
the wireless device is a member of the group of recipients indicated by the group identifier, and
the number of spatial streams to be received by the wireless device is equal to zero.

### Claim 2 (depends on 1)

The method of claim 1, wherein the signal field is received in a physical layer convergence procedure (PLCP) protocol data unit (PPDU).

### Claim 3 (depends on 2)

The method of claim 2, wherein the signal field is a Very High Throughput (VHT) Signal-A (VHT-SIG-A) field.

### Claim 4 (depends on 1)

The method of claim 1, wherein the transmitting device is an access point (AP).

### Claim 5 (depends on 1)

The method of claim 1, wherein the power saving indicator is 1-bit information.

### Claim 6

A wireless apparatus comprising:
a transceiver configured to transmit and receive a radio signal; and
a processor operatively coupled to the transceiver and configured to:
acquire a transmission opportunity (TXOP) from a transmitting device,
receive a signal field from the transmitting device, the signal field including a group identifier, a number indicator and a power saving indicator, the group identifier indicating a group of recipients, the number indicator indicating a number of spatial streams for a corresponding recipient, the power saving indicator indicating that the transmitting device allows the wireless device to enter a doze state during the TXOP, and
enter the doze state until the end of the TXOP if:
the power saving indicator indicates an allowance of entering the doze state during the TXOP,
the wireless device is a member of the group of recipients indicated by the group identifier, and
the number of spatial streams to be received by the wireless device is equal to zero.

### Claim 7 (depends on 6)

The wireless apparatus of claim 6, wherein the signal field is received in a physical layer convergence procedure (PLCP) protocol data unit (PPDU).

### Claim 8 (depends on 7)

The wireless apparatus of claim 7, wherein the signal field is a Very High Throughput (VHT) Signal-A (VHT-SIG-A) field.

### Claim 9 (depends on 6)

The wireless apparatus of claim 6, wherein the transmitting device is an access point (AP).

### Claim 10 (depends on 6)

The wireless apparatus of claim 6, wherein the power saving indicator is 1-bit information.