# US 11,452,175 B2 · Management frames for rate adaptation by enhanced directional multi-gigabit (EDMG) stations in millimeter wave (mmWave) networks

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

- Number: US 11,452,175 B2
- Document ID: US11452175B2
- Status: Granted
- Kind: B2
- Application number: 16/938,718
- Filed: 2020-07-24
- Published: 2020-11-12
- Granted: 2022-09-20
- Earliest claimed: 2018-02-26
- Assignees: Intel Corporation
- Applicants: Intel Corporation
- Inventors: Cheng Chen; Carlos Cordeiro; Oren Kedem
- Web page: https://patentgrep.com/patent/US11452175B2

## CPC

- H04L 27/2602: {Signal structure}
- H03M 13/1102: {Codes on graphs and decoding on graphs, e.g. low-density parity check [LDPC] codes}
- H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
- H04L 1/0002: {by adapting the transmission rate}
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 1/0006: {by adapting the transmission format}
- H04L 1/1614: {using bitmaps}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority}
- H04L 5/0087: {when data requirements change}
- H04L 5/143: {for modulated signals (H04L5/1469 takes precedence)}
- H04L 5/1446: {of transmission speed}
- H04L 5/1469: {using time-sharing}
- H04L 27/0008: {arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453)}
- H04L 27/0012: {arrangements for identifying the type of modulation}
- H04L 27/2607: {Cyclic extensions}
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 88/10: adapted for operation in multiple networks, e.g. multi-mode access points
- H04B 7/0413: MIMO systems
- H04L 1/005: {Iterative decoding, including iteration between signal detection and decoding operation}
- H04L 1/0057: {Block codes (H04L1/0061, H04L1/0064 take precedence)}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Embodiments of an enhanced directional multi-gigabit (EDMG) station (STA), access point (AP), and method of communication are generally described herein. The EDMG STA may receive, from the AP, a Link Measurement Request Frame that includes a request for information for time division duplexing (TDD) rate adaptation. The EDMG STA may transmit a Link Measurement Response Frame that includes a Directional Multi Gigabit (DMG) Link Margin element that includes a Rate Adaptation Control parameter. The DMG Link Margin element may be configurable to include one or more optional fields for the TDD rate adaptation and transmit power control. The Rate Adaptation Control parameter may indicate: a number of space time streams (STSs) for which information is included in the DMG Link Margin element; and whether the DMG Link Margin element includes the one or more optional fields.

## Claims

### Claim 1

An apparatus of an enhanced directional multi-gigabit (EDMG) station (STA), the apparatus comprising: memory; and processing circuitry, configured to:
decode a Link Measurement Request Frame received from an access point (AP) requesting the EDMG STA to perform link measurements;
encode a Link Measurement Report Frame for transmission to the AP in response to the Link Measurement Request Frame, the Link Measurement Report Frame to include a Directional Multi Gigabit (DMG) Link Margin element if the EDMG STA supports time-division duplexing (TDD) link maintenance, the DMG Link Margin element is encoded to include a Rate Adaption Control parameter,
wherein the DMG Link Margin element is configurable to include one or more optional fields for TDD rate adaptation and transmit power control (TPC),
wherein the Rate Adaptation Control parameter indicates:
a number of space time streams (STSs) for which information is included in the DMG Link Margin element, and
whether the DMG Link Margin element includes the one or more optional fields.

### Claim 2 (depends on 1)

The apparatus according to claim 1,
wherein the one or more optional fields for TDD rate adaptation and transmit power control include:
a Parameters Across receive (RX) chains field,
a Parameters Across Physical Layer Convergence Procedure Protocol Data Units (PPDUs) field,
a Parameters Across Low Density Parity Check (LDPC) Codewords field,
a Parameters Across Single Carrier (SC) Blocks or Orthogonal Frequency Division Multiplexing (OFDM) Symbols field, and
an extended TPC field.

### Claim 3 (depends on 2)

The apparatus according to claim 2, wherein the Parameters Across PPDUs field includes, for each of the STSs for which information is included in the DMG Link Margin element:
a signal-to-noise ratio (SNR),
a modulation and coding scheme (MCS), and
a link margin.

### Claim 4 (depends on 3)

The apparatus according to claim 3, wherein the Rate Adaptation Control Parameter further indicates a number of PPDUs used to determine the SNR.

### Claim 5 (depends on 2)

The apparatus according to claim 2, wherein the Parameters Across LDPC Codewords field includes, for each of the STSs for which information is included in the DMG Link Margin element:
an average number of iterations used for LDPC decoding by the EDMG STA,
a maximum number of iterations used for the LDPC decoding,
a number of LDPC codewords for which a syndrome computed in the LDPC decoding is non-zero, and
a number of LDPC codewords used to determine the average number of iterations, the maximum number of iterations, and the number of LDPC codewords for which the syndrome computed in the LDPC decoding is non-zero.

### Claim 6 (depends on 5)

The apparatus according to claim 5, the processing circuitry further configured to:
attempt to detect a reset condition that includes: a change of modulation, MCS, constellation, LDPC mode, guard interval (GI)/cyclic prefix (CP) mode, multiple-input multiple-output (MIMO) mode, MIMO rank, or MIMO type; and
an end of a reporting period; and
if the reset condition is detected, reset values for: the average number of iterations; the maximum number of iterations; the number of LDPC codewords for which a syndrome computed in the LDPC decoding is non-zero; and the number of LDPC codewords used to determine the average number of iterations, the maximum number of iterations, and the number of LDPC codewords for which the syndrome computed in the LDPC decoding is non-zero.

### Claim 7 (depends on 2)

The apparatus according to claim 2, wherein the Parameters Across SC Blocks or OFDM Symbols field includes, for each of the STSs for which information is included in the DMG Link Margin element:
an average error vector magnitude (EVM) of SC data symbols or OFDM data subcarriers averaged, for a same modulation and a same MCS, across PPDUs and across SC blocks or OFDM symbols, and
a number of SC blocks or OFDM symbols used to determine the average EVM.

### Claim 8 (depends on 7)

The apparatus according to claim 7, the processing circuitry further configured to:
attempt to detect a reset condition that includes: a change of modulation, MCS, constellation, LDPC mode, guard interval (GI)/cyclic prefix (CP) mode, multiple-input multiple-output (MIMO) mode, MIMO rank, or MIMO type; and an end of a reporting period; and
if the reset condition is detected, reset values for: the average EVM, and the number of SC blocks or OFDM symbols used to determine the average EVM.

### Claim 9 (depends on 2)

The apparatus according to claim 2, wherein:
the DMG Link Margin element includes a modulation and coding scheme (MCS), and
the Rate Adaptation Control parameter further includes:
an IsEDMG field that indicates whether the MCS is related to Enhanced DMG (EDMG) operation or non-EDMG operation, and
an IsSC field that indicates whether the MCS is related to SC operation or OFDM operation.

### Claim 10 (depends on 1)

The apparatus according to claim 1, wherein the EDMG STA is arranged to operate in accordance with a millimeter wave (mmWave) distribution network arrangement.

### Claim 11 (depends on 1)

The apparatus according to claim 1, wherein:
the apparatus includes a transceiver to transmit the DMG Link Margin element,
the processing circuitry includes a baseband processor to encode the DMG Link Margin element, and
the memory is configured to store at least a portion of the DMG Link Margin element.