Communication method and corresponding user terminal, and base station

Patent metadata

Field	Value
Publication number	US-11211970-B2
Application number	US-201815734949-A
Country	US
Kind code	B2
Filing date	Jul 16, 2018
Priority date	Jul 16, 2018
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

The present disclosure provides a communication method and a corresponding user terminal, and a base station. The communication method performed by the user terminal includes receiving information about modulation and coding from the base station; and determining a spreading parameter for the user terminal according to the information about modulation and coding, wherein the spreading parameter is used for the user terminal to spread symbols.

First claim

What is claimed is:

1. A communication method performed by a terminal, the method comprising:
receiving information about modulation and coding from a base station; and
determining a spreading parameter for the terminal according to the information about modulation and coding, wherein the spreading parameter is used for the terminal to spread symbols,
wherein the information about modulation and coding includes index information for a modulation and coding scheme, the determining a spreading parameter for the terminal according to the information about modulation and coding includes:
determining the spreading parameter for the terminal according to an index of the modulation and coding scheme and a first table, the first table including a plurality of indexes and spreading parameters corresponding to respective indexes, wherein the first table is determined by the following steps:
determining a set of spectral efficiencies according to modulation parameters, coding parameters and candidate spreading parameters;
selecting a predetermined number of spectral efficiencies from the set of spectral efficiencies;
obtaining a plurality of spreading parameters included in the first table according to candidate spreading parameters corresponding to the predetermined number of spectral efficiencies to determine the first table.

2. The method of claim 1 , further comprising:
determining at least one of a modulation parameter, a coding parameter, and spectral efficiency for the terminal according to the information about modulation and coding.

3. The method of claim 2 , wherein the spectral efficiency is determined based on the modulation parameter, the coding parameter, and the spreading parameter for the terminal.

4. The method of claim 1 , wherein the spreading parameter for the terminal is determined according to the coding parameter for the terminal.

5. The method of claim 4 , further comprising:
updating the coding parameter for the terminal according to the spreading parameter for the terminal.

6. A terminal, comprising:
a processor;
a storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by the processor, perform processing of:
receiving information about modulation and coding from a base station; and
determining a spreading parameter for the terminal according to the information about modulation and coding, wherein the spreading parameter is used for the terminal to spread symbols,

wherein the information about modulation and coding includes index information for a modulation and coding scheme, the processor is configured to determine the spreading parameter for the terminal according to an index of the modulation and coding scheme and a first table, the first table including a plurality of indexes and spreading parameters corresponding to respective indexes, wherein the first table is determined by the following steps:
determining a set of spectral efficiencies according to modulation parameters, coding parameters and candidate spreading parameters;
selecting a predetermined number of spectral efficiencies from the set of spectral efficiencies;
obtaining a plurality of spreading parameters included in the first table according to candidate spreading parameters corresponding to the predetermined number of spectral efficiencies to determine the first table.

7. The terminal of claim 6 , wherein the processor is further configured to determine at least one of a modulation parameter, a coding parameter, and spectral efficiency for the terminal according to the information about modulation and coding.

8. The terminal of claim 7 , wherein the spectral efficiency is determined based on the modulation parameter, the coding parameter, and the spreading parameter for the terminal.

9. The terminal of claim 6 , wherein the spreading parameter for the terminal is determined according to the coding parameter for the terminal.

10. The terminal of claim 9 ,
wherein the processor is further configured to update the coding parameter for the terminal according to the spreading parameter for the terminal.

11. A base station, comprising:
a processor;
a storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by the processor, perform processing of:
determining information about modulation and coding for a terminal; and
transmitting the information about modulation and coding to the terminal, so that the terminal determines a spreading parameter according to the information about modulation and coding, wherein the spreading parameter is used for the terminal to spread symbols,

wherein the information about modulation and coding includes index information for a modulation and coding scheme so that the terminal determines the spreading parameter for the terminal according to an index of the modulation and coding scheme and a first table, the first table including a plurality of indexes and spreading parameters corresponding to respective indexes, wherein the first table is determined by the following steps:
determining a set of spectral efficiencies according to modulation parameters, coding parameters and candidate spreading parameters;
selecting a predetermined number of spectral efficiencies from the set of spectral efficiencies;
obtaining a plurality of spreading parameters included in the first table according to candidate spreading parameters corresponding to the predetermined number of spectral efficiencies to determine the first table.

Assignees

• Ntt Docomo Inc

Inventors

• Wang Runxin
• Liu Wenjia
• Hou Xiaolin

Classifications

• H04B1/707 Primary

  using direct sequence modulation · CPC title

• H04L1/0003

  by switching between different modulation schemes · CPC title

• H04L1/0025

  Transmission of mode-switching indication · CPC title

• H04L1/0016

  involving special memory structures, e.g. look-up tables · CPC title

• H04W28/06

  Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} · CPC title