# US 12,112,183 B2 · Method and apparatus for contention window size adjustment

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- Number: US 12,112,183 B2
- Document ID: US12112183B2
- Status: Granted
- Kind: B2
- Application number: 17/431,083
- Filed: 2019-02-15
- Published: 2022-04-28
- Granted: 2024-10-08
- Earliest claimed: 2019-02-15
- Assignees: Lenovo (Beijing) Limited
- Applicants: Lenovo (Beijing) Limited
- Inventors: Yu Zhang; Haipeng Lei; Alexander Golitschek Edler Von Elbwart
- Web page: https://patentgrep.com/patent/US12112183B2

## CPC

- G06F 9/452: {Remote windowing, e.g. X-Window System, desktop virtualisation (protocols for virtual reality H04L67/131)}
- H04L 1/1896: {ARQ related signaling}
- G06F 9/3555: {using scaling, e.g. multiplication of index}
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Methods and apparatus for contention window size adjustment are described. A method includes: receiving a first group of feedback signals indicating a first state corresponding to data transmitted in a first band used by a carrier, the first group of feedback signals comprising at least one first feedback signal; receiving a second group of feedback signals indicating a second state corresponding to data transmitted in the first band used by the carrier; determining a first scaling factor α for one of the at least one first feedback signal; determining a ratio of the first group of feedback signals to the first group of feedback signals and the second group of feedback signals; and comparing the ratio to a threshold to determine a contention window size (CWS) of the first band, wherein the first scaling factor α substitutes a weight of the one of the at least one first feedback signal in determination of the ratio of the first group of feedback signals to the first group of feedback signals and the second group of feedback signals.

## Claims

### Claim 1

A method performed by a base station, comprising:
receiving a first group of feedback signals from a user equipment (UE) indicating a first state corresponding to data transmitted in a first band used by a carrier, the first group of feedback signals comprising at least one first feedback signal;
receiving a second group of feedback signals from the UE indicating a second state corresponding to data transmitted in the first band used by the carrier;
determining a first scaling factor α for one of the at least one first feedback signal;
determining a ratio of the first group of feedback signals to the first group of feedback signals and the second group of feedback signals; and
comparing the ratio to a threshold to determine a contention window size of the first band for a contention window;
generating a random back-off counter within the contention window, and adjusting the contention window size of a transmitter of the base station, based on the ratio;
wherein the first scaling factor α substitutes a weight of the one of the at least one first feedback signal in determination of the ratio of the first group of feedback signals to the first group of feedback signals and the second group of feedback signals.

### Claim 2 (depends on 1)

The method of claim 1, further comprising determining a second scaling factor for a second feedback signal in the second group of feedback signals, wherein the second scaling factor is determined as one, wherein the second scaling factor substitutes a weight of the second feedback signal in determination of the ratio of the first group of feedback signals to the first group of feedback signals and the second group of feedback signals.

### Claim 3 (depends on 2)

The method of claim 2, further comprising determining a second scaling factor for another one of the at least one first feedback signal in the first group of feedback signals, wherein the second scaling factor is determined as one, and the second scaling factor substitutes a weight of the another one of at least one first feedback signal in determination of the ratio of the first group of feedback signals to the first group of feedback signals and the second group of feedback signals.

### Claim 4 (depends on 3)

The method of claim 3, wherein the first group of feedback signals comprises at least one third feedback signal different from the at least one first feedback signal.

### Claim 5 (depends on 4)

The method of claim 4, wherein the second group of feedback signals comprises at least one fourth feedback signal different from the second feedback signal.

### Claim 6 (depends on 5)

The method of claim 5, wherein the at least one first feedback signal is determined based on the at least one third feedback signal.

### Claim 7 (depends on 5)

The method of claim 5, wherein the at least one first feedback signal is determined based on the at least one fourth feedback signal.

### Claim 8 (depends on 5)

The method of claim 5, wherein the at least one first feedback signal is determined based on the at least one third feedback signal and the at least one fourth feedback signal.

### Claim 9 (depends on 5)

The method of claim 5, wherein the second group of feedback signals is determined based on the at least one third feedback signal.

### Claim 10 (depends on 5)

The method of claim 5, wherein the second group of feedback signals is determined based on the at least one fourth feedback signal.

### Claim 11 (depends on 5)

The method of claim 5, wherein the second group of feedback signals is determined based on the at least one third feedback signal and the at least one fourth feedback signal.

### Claim 12 (depends on 1)

The method of claim 1, wherein a transport block of data is transmitted via a number of n bands including the first band on the carrier, and wherein the first scaling factor α is determined based on an amount p of second band(s) of the number of n bands, and a listen-before-talk Listen Before Talk (LBT) operation indicates failure in the second band(s) of the number of n bands.

### Claim 13 (depends on 12)

The method of claim 12, wherein the first scaling factor α is determined based on a function of the number of n bands, the amount p of second band(s) of the number of n bands and a first predetermined value q if a second feedback signal, which is associated with the transport block of data, in the second group of feedback signals is received.

### Claim 14 (depends on 12)

The method of claim 12, wherein the first scaling factor α is further determined based on a constant σ if the amount p of second band(s) of the number of n bands is equal to or greater than one.

### Claim 15 (depends on 14)

The method of claim 14, wherein the constant σ is associated with probability of collision in one of the number of n bands.

### Claim 16 (depends on 12)

The method of claim 12, wherein the first scaling factor α is further determined based on a constant σ if the amount p of second band(s) of the number of n bands is equal to zero.

### Claim 17 (depends on 12)

The method of claim 12, wherein the first scaling factor α is further determined based on a function of the number of n bands, the amount p of second band(s) of the number of n bands and a value γ if the amount p of second band(s) of the number of n bands is equal to or greater than one.

### Claim 18 (depends on 12)

The method of claim 12, wherein the first scaling factor α is further determined based on the number of n bands if the amount p of second band(s) of the number of n bands is equal to zero.

### Claim 19 (depends on 1)

The method of claim 1, wherein the first scaling factor ranges from 0 to 1.