# US 12,192,981 B2 · Wireless communication method and wireless communication terminal

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- Number: US 12,192,981 B2
- Document ID: US12192981B2
- Status: Granted
- Kind: B2
- Application number: 18/372,121
- Filed: 2023-09-24
- Published: 2024-01-11
- Granted: 2025-01-07
- Earliest claimed: 2014-09-15
- Assignees: Wilus Institute of Standards and Technology Inc.; SK Telecom Co., Ltd.
- Applicants: Wilus Institute of Standards and Technology Inc.; SK Telecom Co., Ltd.
- Inventors: Woojin Ahn; Yongho Kim; Jinsam Kwak; Juhyung Son
- Web page: https://patentgrep.com/patent/US12192981B2

## CPC

- H04W 72/12: Wireless traffic scheduling
- H04W 52/0225: {using monitoring of external events, e.g. the presence of a signal}
- H04W 74/0816: with collision avoidance
- 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)
- 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

Provided is a wireless communication terminal. The wireless communication terminal includes: a transceiver configured for transmitting/receiving a wireless signal; and a processor configured for controlling an operation of the wireless communication terminal. The transceiver receives a first frame indicating that there is data to be transmitted from a base wireless communication terminal to a plurality of wireless communication terminals including the wireless communication terminal and receives data based on the first frame. The base wireless communication terminal is any one wireless communication terminal different from the plurality of wireless communication terminals.

## Claims

### Claim 1

A wireless communication terminal comprising:
a transceiver; and
a processor,
wherein the processor is configured to:
receive, by using the transceiver, data from a base wireless communication terminal through a sub-band while the base wireless communication terminal is performing simultaneous transmission to the wireless communication terminal and one or more other wireless communication terminals other than the wireless communication terminal through one or more other sub-bands,
when a transmission of data to the wireless communication terminal from the base wireless communication terminal during the simultaneous transmission is terminated, enter a sleep mode for power saving while a transmission of data to the one or more other wireless communication terminals from the base wireless communication terminal during the simultaneous transmission is going on, wherein a dummy data including value 0 is transmitted from the base wireless communication terminal after the transmission of the data to the wireless communication terminal is terminated during the simultaneous transmission, and the dummy data is transmitted until the transmission of the data to the one or more other wireless communication terminals is terminated, and
wake up from the sleep mode based on an end of the simultaneous transmission,
wherein the wireless communication terminal and the one or more other wireless communication terminals are associated with the base wireless communication terminal.

### Claim 2 (depends on 1)

The wireless communication terminal of claim 1, wherein the transceiver is configured to receive information indicating that the transmission of the data to the wireless communication terminal during the simultaneous transmission is terminated,
wherein the processor is configured to enter the sleep mode based on the information.

### Claim 3

An operation method of a wireless communication terminal, the method comprising:
receiving data from a base wireless communication terminal through a sub-band, while the base wireless communication terminal is performing simultaneous transmission to the wireless communication terminal and one or more other wireless communication terminals other than the wireless communication terminal through one or more other sub-bands;
when a transmission of data to the wireless communication terminal during the simultaneous transmission is terminated, entering a sleep mode for power saving while a transmission of data to the one or more other wireless communication terminals from the base wireless communication terminal during the simultaneous transmission is going on, wherein a dummy data including value 0 is transmitted from the base wireless communication terminal after the transmission of the data to the wireless communication terminal is terminated during the simultaneous transmission, and the dummy data is transmitted until the transmission of the data to the one or more other wireless communication terminals is terminated; and
waking up from the sleep mode based on an end of the simultaneous transmission,
wherein the wireless communication terminal and the one or more other wireless communication terminals are associated with the base wireless communication terminal.

### Claim 4 (depends on 3)

The method of claim 3, wherein the entering the sleep mode comprises:
receiving information indicating that the transmission of the data to the wireless communication terminal during the simultaneous transmission is terminated, and
entering the sleep mode based on the information.