# US 2019/0246386 A1 · Methods and apparatus for multi-carrier communication systems with adaptive transmission and feedback

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- Number: US 2019/0246386 A1
- Document ID: US20190246386A1
- Status: Published application
- Kind: A1
- Application number: 16/126,896
- Filed: 2018-09-10
- Published: 2019-08-08
- Earliest claimed: 2004-02-13
- Assignees: Neocific, Inc.
- Applicants: Neocific, Inc.
- Inventors: Xiaodong Li; Titus Lo; Kemin Li; Haiming Huang
- Web page: https://patentgrep.com/patent/US20190246386A1

## CPC

- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04B 7/0413: MIMO systems
- H04L 1/0026: {Transmission of channel quality indication}
- H04L 1/0029: {Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling (power control H04W52/04)}
- H04L 1/0068: {by puncturing}
- H04L 1/0073: {Special arrangements for feedback channel}
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0046: {Determination of the number of bits transmitted on different sub-channels}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling}
- H04W 72/044: based on the type of the allocated resource
- H04W 72/20: Control channels or signalling for resource management
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04W 52/26: using transmission rate or quality of service QoS [Quality of Service]
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- 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

An arrangement is disclosed where in a multi-carrier communication system, the modulation scheme, coding attributes, training pilots, and signal power may be adjusted to adapt to channel conditions in order to maximize the overall system capacity and spectral efficiency without wasting radio resources or compromising error probability performance, etc.

## Claims

### Claim 1

A transmission control method by a base station serving a plurality of mobile stations in a multi-carrier communication system, the communication system utilizing a transmission structure with time slots in the time domain and frequency subchannels in the frequency domain, the method comprising:
determining a set of mobile station-based transmission parameters to be used for a subsequent transmission, the set of transmission parameters indicating a pilot pattern for one or more frequency subchannels utilized by the system, wherein the pilot pattern differs from one time slot to another and wherein the pilot pattern is based on channel conditions or other factors; and
sending a control message to a mobile station, the control message providing information regarding the set of transmission parameters.

### Claim 2 (depends on 1)

The method of claim 1, wherein the set of mobile station-based transmission parameters further comprises a modulation and coding scheme.

### Claim 3 (depends on 1)

The method of claim 1, wherein the set of mobile station-based transmission parameters further comprises a multiple-input multiple-output (MIMO) scheme.

### Claim 4 (depends on 3)

The method of claim 3, wherein the pilot pattern and the MIMO scheme are jointly adapted.

### Claim 5 (depends on 1)

The method of claim 1, wherein the pilot pattern includes a number of pilot symbols.

### Claim 6 (depends on 1)

The method of claim 1, wherein the pilot pattern includes locations of pilot symbols in time or frequency or space.

### Claim 7 (depends on 1)

The method of claim 1, wherein the pilot pattern includes amplitudes and phases of pilot symbols.

### Claim 8 (depends on 1)

The method of claim 1, wherein the other factors include a transmission antenna technique.

### Claim 9 (depends on 1)

The method of claim 1, wherein the other factors include a subchannel configuration.

### Claim 10

A transmission control method by a mobile station served by a base station in a multi-carrier communication system, the communication system utilizing a transmission structure with time slots in the time domain and frequency subchannels in the frequency domain, the method comprising:
receiving, at the mobile station, a control message from the serving base station, the control message providing information regarding a set of mobile station-based transmission parameters to be used for a subsequent transmission; and
determining a pilot pattern for one or more frequency subchannels based on a pilot pattern indicator contained in the set of received transmission parameters, wherein the pilot pattern differs from one time slot to another and wherein the pilot pattern is based on channel conditions or other factors.

### Claim 11 (depends on 10)

The method of claim 10, wherein the pilot pattern includes a number of pilot symbols.

### Claim 12 (depends on 10)

The method of claim 10, wherein the pilot pattern includes locations of pilot symbols in time or frequency or space.

### Claim 13 (depends on 10)

The method of claim 10, wherein the pilot pattern includes amplitudes and phases of pilot symbols.

### Claim 14

A base station serving a plurality of mobile stations in a multi-carrier communication system, the communication system utilizing a transmission structure with time slots in the time domain and frequency subchannels in the frequency domain, the base station comprising:
a processor configured to determine a set of mobile station-based transmission parameters to be used for a subsequent transmission, the set of transmission parameters indicating a pilot pattern for one or more frequency subchannels utilized by the system, wherein the pilot pattern differs from one time slot to another and wherein the pilot pattern is based on channel conditions or other factors; and
a transmitter configured to transmit a control message to a mobile station, the control message providing information regarding the set of transmission parameters.

### Claim 15 (depends on 14)

The base station of claim 14, wherein the set of mobile station-based transmission parameters further comprises a multiple-input multiple-output (MIMO) scheme.

### Claim 16 (depends on 15)

The base station of claim 15, wherein the pilot pattern and the MIMO scheme are jointly adapted.

### Claim 17 (depends on 14)

The base station of claim 14, wherein the pilot pattern includes a number of pilot symbols.

### Claim 18 (depends on 14)

The base station in claim 14, wherein the pilot pattern includes locations of pilot symbols in time or frequency or space.

### Claim 19 (depends on 14)

The base station of claim 14, wherein the pilot pattern includes amplitudes and phases of pilot symbols.

### Claim 20 (depends on 14)

The base station of claim 14, wherein the other factors include a transmission antenna technique.

### Claim at position 21

21-25. (canceled)