# US 12,193,116 B2 · Wireless communication method using enhanced distributed channel access, and wireless communication terminal using same

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- Number: US 12,193,116 B2
- Document ID: US12193116B2
- Status: Granted
- Kind: B2
- Application number: 18/384,678
- Filed: 2023-10-27
- Published: 2024-02-22
- Granted: 2025-01-07
- Earliest claimed: 2016-09-07
- Assignees: Wilus Institute of Standards and Technology Inc.
- Applicants: Wilus Institute of Standards and Technology Inc.
- Inventors: Woojin Ahn; Juhyung Son; Geonjung Ko; Jinsam Kwak
- Web page: https://patentgrep.com/patent/US12193116B2

## CPC

- H04W 80/02: Data link layer protocols
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04W 28/0268: {using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR] (negotiating SLA or negotiating QoS H04W28/24)}
- H04W 40/244: {using a network of reference devices, e.g. beaconing}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 74/00: Wireless channel access
- H04W 74/06: using polling
- H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02)
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04W 74/0816: with collision avoidance
- 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)

## Abstract

Provided is a wireless communication terminal that communicates wirelessly. The wireless communication terminal includes a transceiver and a processor for processing a radio signal received through the transceiver or a radio signal to be transmitted through the transceiver. The processor accesses a channel according to according to a priority of data to be transmitted to the base communication terminal by the wireless communication terminal.

## Claims

### Claim 1

A wireless communication terminal that wirelessly communicates with a base wireless communication terminal, the wireless communication terminal comprising:
a transceiver; and
a processor,
wherein the processor is configured to: receive a trigger frame from the base wireless communication terminal,
transmit, to the base wireless communication terminal, a physical layer protocol data unit (PPDU) based on the trigger frame using the transceiver,
switch a parameter set, which is a set of parameters used for a channel access, from a first parameter set to a second parameter set based on whether the base wireless communication terminal triggers a multi-user uplink transmission participation of the wireless communication terminal,
when a medium access control (MAC) protocol data unit (MPDU) included in the PPDU does not request an immediate response, set a second parameter set timer for an access category of the MPDU when the transmission of the PPDU ends,
when the MPDU included in the PPDU requests an immediate response, set the second parameter set timer for the access category of the MPDU for which an ACK is received when the immediate response is received,
when the second parameter set timer expires, terminate an application of the second parameter set, and
access a channel according to an access category priority of data to be transmitted to the base wireless communication terminal by the wireless communication terminal and the parameter set.

### Claim 2 (depends on 1)

The wireless communication terminal of claim 1, wherein the MPDU included in the PPDU is a quality of service (QOS) data frame.

### Claim 3 (depends on 1)

The wireless communication terminal of claim 1, wherein the processor is configured to receive a beacon frame from the base wireless communication terminal and obtain information indicating a period of the second parameter set timer from the beacon frame.

### Claim 4 (depends on 1)

The wireless communication terminal of claim 1, wherein the processor is configured to calculate a random integer value within a contention window (CW), set a backoff timer based on the random integer value, and access the channel based on the backoff timer and a predetermined slot time, wherein the parameter set comprises a minimum value (CWmin) of the CW and a maximum value (CWmax) of the CW.

### Claim 5 (depends on 4)

The wireless communication terminal of claim 4, wherein the processor is configured to
if a size of the CW is greater than the CWmax of the CW according to the access category of the data to be transmitted, set the size of the CW to the CWmax.

### Claim 6 (depends on 1)

The wireless communication terminal of claim 1, wherein the processor is configured to operate a plurality of queues that are classified according to an access category of data stored in a queue and performs backoff procedure of accessing a channel based on a time corresponding to a backoff timer in each of the plurality of queues, and
when there is no data stored in the queue and the backoff timer corresponding to the queue is 0, perform no operation at a slot boundary of the backoff timer,
wherein the backoff timer is set based on a random integer value calculated in a contention window (CW), and is reduced when the channel is idle for a predetermined slot time.

### Claim 7 (depends on 6)

The wireless communication terminal of claim 6, wherein when there is no data stored in the queue and the backoff timer corresponding to the queue is 0, the processor is configured to maintain the backoff timer to be 0.

### Claim 8

A method of a wireless communication terminal that wirelessly communicates with a base wireless communication terminal, the method comprising:
receiving a trigger frame from the base wireless communication terminal;
transmitting, to the base wireless communication terminal, a physical layer protocol data unit (PPDU) based on the trigger frame;
switching a parameter set, which is a set of parameters used for a channel access, from a first parameter set to a second parameter set based on whether the base wireless communication terminal triggers a multi-user uplink transmission participation of the wireless communication terminal;
when a medium access control (MAC) protocol data unit (MPDU) included in the PPDU does not request an immediate response, setting a second parameter set timer for an access category of the MPDU when the transmission of the PPDU ends;
when the MPDU included in PPDU requests the immediate response, setting the second parameter set timer for the access category of the MPDU for which an ACK is received when the immediate response is received;
when the second parameter set timer expires, terminating an application of the second parameter set;
accessing a channel according to an access category of data to be transmitted to the base wireless communication terminal and the parameter set; and
transmitting the data through the channel.

### Claim 9 (depends on 8)

The method of claim 8, wherein the MPDU included in the PPDU is a quality of service (QOS) data frame.

### Claim 10 (depends on 8)

The method of claim 8, the method further comprising:
receiving a beacon frame from the base wireless communication terminal; and
obtaining information indicating a period of the second parameter set timer from the beacon frame.