# US 2021/0084635 A1 · Collision mitigation for directional response in millimeter wave wireless local area network system

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- Number: US 2021/0084635 A1
- Document ID: US20210084635A1
- Status: Published application
- Kind: A1
- Application number: 16/492,233
- Filed: 2018-03-12
- Published: 2021-03-18
- Earliest claimed: 2017-03-10
- Assignees: InterDigital Patent Holdings, Inc.
- Applicants: Interdigital Patent Holdings, Inc.
- Inventors: Oghenekome Oteri; Hanqing Lou; Xiaofei Wang; Li-Hsiang Sun; Rui Yang
- Web page: https://patentgrep.com/patent/US20210084635A1

## CPC

- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04B 7/088: {using beam selection}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04W 16/28: using beam steering
- H04W 72/044: based on the type of the allocated resource
- H04W 84/12: WLAN [Wireless Local Area 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)

## Abstract

A method, apparatus, and system for beamforming training using a wireless transmit receive unit (WTRU). A WTRU may receive an indication of a number of space time slots (STSs) from an access point (AP) within a beacon frame during a beamforming training allocation. The WTRU may send a response signal to the AP in a specific STS based on a function of the number of STSs. The WTRU may receive an acknowledgement (ACK) from the AP confirming the response was received. Alternatively, the AP may send a signal indicating that a collision occurred and alter the number of STSs, and the WTRU may try again in the next beamforming training allocation.

## Claims

### Claim 1

A method for beamforming training for a wireless transmit receive unit (WTRU), the method comprising:
receiving an indication, from an access point or a personal basic service control point (AP/PCP), within a beacon frame during a beamforming training allocation, of a number of space time slots (STSs) for a specific transmit sector of the AP/PCP;
sending a signal via a specific transmit sector corresponding to the specific sector of the AP/PCP of the WTRU, in one or more randomly selected STSs from the number of STSs; and
receiving an acknowledgement (ACK) confirming the signal was received by the AP/PCP.

### Claim 2 (depends on 1)

The method of claim 1, wherein the ACK is received in a sector of a sector sweep from an AP/PCP.

### Claim 3 (depends on 1)

The method of claim 1, wherein the WTRU is an enhanced directional multi-gigabit (EDMG) station.

### Claim 4 (depends on 1)

The method of claim 1, wherein the signal is sent in a direction based on training that occurred during a beacon transmission interval (BTI).

### Claim 5 (depends on 1)

The method of claim 1, wherein the number of STSs for the specific sector may be an equal or unequal number compared to another sector.

### Claim 6

(canceled)

### Claim 7 (depends on 1)

The method of claim 1, wherein the AP/PCP that sent the indication of the number of STSs is associated with the WTRU.

### Claim 8 (depends on 1)

The method of claim 1, wherein the AP/PCP that sent the indication of the number of STSs is unassociated with the WTRU.

### Claim 9 (depends on 1)

The method of claim 1, wherein the number of STSs may be indicated in a field of the beacon frame.

### Claim 10

A wireless transmit receive unit (WTRU) apparatus for beamforming training, the apparatus comprising:
a processor,
a receiver operatively connected to the processor, the receiver and processor configure to receive an indication, from an access point or a personal basic service set control point (AP/PCP), within a beacon frame during a beamforming training allocation, of a number of space time slots (STSs) for a specific sector of the AP/PCP;
a transmitter operatively coupled to the processor, the transmitter and processor configure to send a signal via a sector corresponding to the specific sector of the AP/PCP, in one or more randomly selected STSs from the number of STSs ; and
the receiver and processor further configure to receive an acknowledgement (ACK) confirming the signal was received by the AP/PCP.

### Claim 11 (depends on 10)

The WTRU of claim 10, wherein the ACK is received in a sector of a sector sweep from an AP.

### Claim 12 (depends on 10)

The WTRU of claim 10, wherein the WTRU is an enhanced directional multi-gigabit (EDMG) station.

### Claim 13 (depends on 10)

The WTRU of claim 10, wherein the signal is sent in a direction based on training that occurred during a beacon transmission interval (BTI).

### Claim 14 (depends on 10)

The WTRU of claim 10, wherein the number of STSs for the specific sector may be an equal or unequal number compared to another sector.

### Claim 15

(canceled)

### Claim 16 (depends on 10)

The WTRU of claim 10, wherein the AP/PCP that sent the indication of the number of STSs is received from an associated with the WTRU.

### Claim 17 (depends on 10)

The WTRU of claim 10, wherein the AP/PCP that sent the indication of the number of STSs is unassociated with the WTRU.

### Claim 18 (depends on 10)

The WTRU of claim 10, wherein the number of STSs may be indicated in field of the beacon frame.