# US 10,375,679 B2 · Trigger frame format for orthogonal frequency division multiple access (OFDMA) communication

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,375,679 B2
- Document ID: US10375679B2
- Status: Granted
- Kind: B2
- Application number: 14/961,635
- Filed: 2015-12-07
- Published: 2016-06-09
- Granted: 2019-08-06
- Earliest claimed: 2014-12-05
- Assignees: Marvell World Trade Ltd.
- Applicants: Marvell World Trade Ltd.
- Inventors: Liwen Chu; Yakun Sun; Hongyuan Zhang; Lei Wang; Jinjing Jiang; Hui-Ling Lou
- Web page: https://patentgrep.com/patent/US10375679B2

## CPC

- H04L 27/2602: {Signal structure}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04W 72/30: Resource management for broadcast services
- H04L 5/0037: {Inter-user or inter-terminal allocation}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 27/2603: {Signal structure ensuring backward compatibility with legacy system}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Multiple trigger frames are generated at a first communication device to trigger an uplink orthogonal frequency multiple access (OFDMA) transmission by multiple second communication devices. The multiple trigger frames include a broadcast trigger frame that includes information to indicate transmission parameters for a first subset of the second communication devices, and one or more unicast trigger frames, each of the one or more unicast trigger frame including information to indicate transmission parameters for a particular second communication device in a second subset of the second communication devices. The broadcast trigger frame is transmitted, in a first frequency portion of a downlink OFDMA transmission, to the first subset of the second communication devices, and respective unicast trigger frames are transmitted, in respective second frequency portions of the downlink OFDMA transmission, to the second subset of the second communication devices.

## Claims

### Claim 1

A method for communicating in a wireless communication network, the method comprising:
generating, at a first communication device, multiple trigger frames to trigger an uplink orthogonal frequency multiple access (OFDMA) transmission by multiple second communication devices, including generating
(i) a broadcast trigger frame that includes information to indicate transmission parameters for a first subset of the second communication devices and
(ii) one or more unicast trigger frames, wherein each of the one or more unicast trigger frame includes information to indicate transmission parameters for a particular second communication device in a second subset of the second communication devices;
transmitting, with the first communication device, the multiple trigger frames to the multiple second communication devices in a single downlink OFDMA physical layer (PHY) protocol data unit (PPDU), including
(i) transmitting the broadcast trigger frame to the first subset of the second communication devices, wherein the broadcast trigger frame is transmitted in a first frequency portion of the single downlink OFDMA PPDU to the multiple second communication devices, and
(ii) transmitting the one or more unicast trigger frames to the second subset of the second communication devices, wherein one or more respective unicast trigger frames are transmitted in one or more respective second frequency portions of the single downlink OFDMA PPDU, the respective second frequency portions corresponding with the respective second communication devices in the second subset, wherein the one or more second frequency portions do not overlap in frequency with the first frequency portion; and
receiving, at the first communication device, the triggered uplink OFDMA transmission, wherein the triggered uplink OFDMA transmission includes respective transmissions from the multiple second communication devices.

### Claim 2 (depends on 1)

The method of claim 1, wherein:
respective frequency portions of the uplink OFDMA transmission correspond with respective second communication devices;
generating the multiple trigger frames further comprises including, in each of the trigger frames, indications of the respective frequency portions corresponding with the respective second communication devices.

### Claim 3 (depends on 2)

The method of claim 2, wherein:
each of the trigger frames includes (i) a common field to indicate common transmission information for the multiple second communication devices and (ii) one or more per-device information fields that include respective transmission information for respective ones of the multiple second communication devices,
the one or more per-device information fields include respective resource unit allocation indications that indicate the respective frequency portions corresponding with the respective second communication devices, and
each of one or more of the resource unit allocation indications includes (i) a respective first portion that indicates a channel that includes at least an initial portion of a respective resource unit allocated to the corresponding second communication device and (ii) a respective second portion that indicates (a) a location, within the channel, of a beginning of the respective resource unit and (b) a width of the respective resource unit.

### Claim 4 (depends on 1)

The method of claim 1, wherein the single downlink OFDMA PPDU further includes data for second communication devices in the second subset of the multiple second communication devices.

### Claim 5 (depends on 4)

The method of claim 4, wherein:
data for a particular second communication device in the second set is transmitted to the particular second communication device in a particular second frequency portion of the single downlink OFDMA PPDU, and
a unicast trigger frame, of the one or more unicast trigger frames, corresponding to the particular second communication device is transmitted to the particular second communication device in the particular second frequency portion of the single downlink OFDMA PPDU.

### Claim 6 (depends on 4)

The method of claim 4, wherein the single downlink OFDMA PPDU does not include data for second communication devices in the first subset of the multiple second communication devices.

### Claim 7 (depends on 1)

The method of claim 1, wherein:
the single downlink OFDMA PPDU includes a signal field, and wherein the signal field includes information to indicate that the single downlink OFDMA PPDU includes the broadcast trigger frame directed to multiple second communication devices.

### Claim 8

An apparatus, comprising:
a network interface device having one or more integrated circuits configured to
generate a single downlink orthogonal frequency division multiple access (OFDMA) physical layer (PHY) protocol data unit (PPDU) that includes multiple trigger frames to trigger an uplink OFDMA transmission by multiple communication devices, wherein the multiple trigger frames include
(i) a broadcast trigger frame that includes information to indicate transmission parameters for a first subset of the multiple communication devices and
(ii) one or more unicast trigger frames, wherein each of the one or more unicast trigger frame includes information to indicate transmission parameters for a particular communication device in a second subset of the multiple communication devices;
transmit the broadcast trigger frame to the first subset of the multiple communication devices, wherein the broadcast trigger frame is transmitted in a first frequency portion of the single downlink OFDMA PPDU to the multiple communication devices, and
transmit the one or more unicast trigger frames to the second subset of the multiple communication devices, wherein one or more respective unicast trigger frames are transmitted in one or more respective second frequency portions of the single downlink OFDMA PPDU, the respective second frequency portions corresponding with the respective one of the multiple communication devices in the second subset, wherein the one or more second frequency portions do not overlap in frequency with the first frequency portion; and
receive the triggered uplink OFDMA transmission, wherein the triggered uplink OFDMA transmission includes respective transmissions from the multiple communication devices.

### Claim 9 (depends on 8)

The apparatus of claim 8, wherein:
respective frequency portions of the uplink OFDMA transmission correspond with respective ones of the multiple communication devices; and
the one or more integrated circuits are configured to include, in each of the trigger frames, indications of the respective frequency portions corresponding with the respective ones of the multiple communication devices.

### Claim 10 (depends on 9)

The apparatus of claim 9, wherein:
each of the trigger frames includes (i) a common field to indicate common transmission information for the multiple communication devices and (ii) one or more per-device information fields that include respective transmission information for respective ones of the multiple communication devices,
the one or more per-device information fields include respective resource unit allocation indications that indicate the respective frequency portions corresponding with the respective ones of the multiple communication devices, and
a particular resource unit allocation indication, of the respective resource allocation indications, includes (i) a first portion that indicates a channel that includes at least an initial portion of a resource unit allocated to the corresponding communication device of the multiple communication devices and (ii) a second portion that indicates (a) a location, within the channel, of a beginning of the resource unit and (b) a width of the resource unit.

### Claim 11 (depends on 8)

The apparatus of claim 8, wherein the single downlink OFDMA PPDU further includes data for communication devices in the second subset of the multiple communication devices.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein:
data for a particular communication device in the second subset is transmitted to the particular communication device in a particular second frequency portion of the single downlink OFDMA PPDU, and
a unicast trigger frame, of the one or more unicast trigger frames, corresponding to the particular communication device is transmitted to the particular communication device in the particular second frequency portion of the single downlink OFDMA PPDU.

### Claim 13 (depends on 11)

The apparatus of claim 11, wherein the single downlink OFDMA PPDU does not include data for communication devices in the first subset of the multiple communication devices.

### Claim 14 (depends on 8)

The apparatus of claim 8, wherein the single downlink OFDMA PPDU includes a signal field, and wherein the signal field includes information to indicate that the data unit includes the broadcast trigger frame directed to multiple communication devices.