AMC (adaptive modulation and coding) method and apparatus for increasing up-link performance and record medium storing the method

• US 20060119494A1
• Filed: 01/10/2006
• Published: 06/08/2006
• Est. Priority Date: 05/12/2004
• Status: Abandoned Application

• Current Assignee: KT Corporation
• Original Assignee: KT Corporation
• Inventors: Kim, Kyung-Tae, Na, Jun-Chae, Jang, Won-Hak
• Application Number:
  US11/328,705
• Publication Number:
  US 20060119494A1
• Time in Patent Office: Days
• US Class Current: 341/143
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0016 involving special memory structures, e.g. look-up tables
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication

Abstract

An adaptive modulation and coding (AMC) method and apparatus for increasing up-link performance and a record medium storing the method are disclosed. In one embodiment, the method comprises: (a) receiving a signal from the base station, which stores an identical mapping table to that stored in the terminal, wherein the mapping table lists i) adaptive modulating and coding methods corresponding to plural signal-to-noise ratios (SNRs), and ii) mapping identifiers corresponding to the adaptive modulating and coding methods, (b) measuring a SNR for the received signal, (c) extracting a mapping identifier corresponding to the SNR, and (d) transmitting the mapping identifier to the base station so that the base station can demodulate and decode data received from the terminal by referring to the transmitted mapping identifier and the stored mapping table.

Claims

1. A method of adaptive modulation and coding (AMC) for improving up-link performance in a mobile terminal, being in signal communication with a base station via a network, the method comprising:

receiving, at the mobile terminal, a signal from the base station, wherein the mobile terminal stores a mapping table which lists i) modulation and coding methods corresponding to a plurality of signal-to-noise ratios (SNRs) and ii) mapping identifiers associated with each modulation and coding method;

measuring an SNR of the received signal;

obtaining a mapping identifier corresponding to the measured SNR; and

transmitting the obtained mapping identifier to the base station.

2. The method of claim 1, further comprising:

modulating and encoding, at the mobile terminal, data based on a modulation and coding method associated with the obtained mapping identifier;

combining the obtained mapping identifier with the modulated and encoded data; and

transmitting the combined data to the base station, wherein the base station stores the same mapping table and demodulates and decodes the modulated and encoded data based on the transmitted mapping identifier and the stored mapping table.

3. The method of claim 1, wherein the network is a radio frequency identification (RFID) network.

4. The method of claim 1, further comprising:

receiving the mapping table from the base station; and

storing the received mapping table in the mobile terminal.

5. A method of adaptive modulation and coding for improving up-link performance in a base station, being in signal communication with a mobile terminal via a network, the method comprising:

transmitting a signal to the mobile terminal, wherein the base station stores a mapping table which lists i) modulation and coding methods corresponding to a plurality of signal-to-noise ratios (SNRs) and ii) mapping identifiers associated with each modulation and coding method;

receiving a mapping identifier from the mobile terminal;

receiving modulated and encoded data, associated with the received mapping identifier, from the mobile terminal; and

demodulating and decoding the received data based on a demodulation and decoding method associated with the received mapping identifier.

6. The method of claim 5, wherein the mapping identifier is received separately, or along with the modulated and encoded data from the mobile terminal.

7. The method of claim 5, wherein the network is a radio frequency identification (RFID) network.

8. The method of claim 5, further comprising:

transmitting the stored mapping table to the mobile terminal so that the terminal can store the mapping table.

9. A device for adaptive modulation and coding in a mobile terminal for improving up-link performance, the device comprising:

a receiver configured to receive a signal from a base station, being in signal communication with the mobile terminal via a network;

a signal-to-noise ratio (SNR) measurer configured to measure SNR for the received signal;

a memory configured to store a mapping table which lists i) modulation and coding methods corresponding to a plurality of signal-to-noise ratios (SNRs) and ii) mapping identifiers associated with each modulation and coding method;

an identifier extractor configured to extract a mapping identifier corresponding to the measured SNR from the mapping table; and

a transmitter configured to transmit the extracted mapping identifier to the base station.

10. The device of claim 9, further comprising:

a modulator/encoder configured to modulate and encode data based on a modulation and coding method associated with the extracted mapping identifier; and

a combiner configured to combine the modulated and encoded data with the mapping identifier,

wherein the transmitter is configured to transmit the combined data to the base station, wherein the base station stores the same mapping table and demodulates and decodes the modulated and encoded data based on the transmitted mapping identifier and the stored mapping table.

11. The device of claim 9, wherein the network is a radio frequency identification (RFID) network.

12. The device of claim 9, wherein the device is configured to receive and store the mapping table in the memory.

13. A device for adaptive modulation and coding (AMC) in a base station for improving up-link performance, the device comprising:

a transmitter configured to transmit a signal to a mobile terminal via a network;

a memory configured to store a mapping table which lists i) modulation and coding methods corresponding to a plurality of signal-to-noise ratios (SNRs) and ii) mapping identifiers associated with each modulation and coding method;

a receiver configured to receive a mapping identifier and modulated and encoded data associated with the mapping identifier from the mobile terminal; and

a demodulator/decoder configured to demodulate and decode the received data based on a demodulation and decoding method associated with the received mapping identifier.

14. The device of claim 13, wherein the receiver is configured to receive the mapping identifier separately, or along with the modulated and encoded data

15. The device of claim 13, wherein the network is a radio frequency identification (RFID) network.

16. A computer readable record medium storing a method of adaptive modulation and coding in a mobile terminal, being in signal communication with a base station via a network, the method comprising:

receiving, at the mobile terminal, a signal from the base station, wherein the mobile terminal stores a mapping table which lists i) modulation and coding methods corresponding to a plurality of signal-to-noise ratios (SNRs) and ii) mapping identifiers associated with each modulation and coding method;

measuring an SNR of the received signal;

obtaining a mapping identifier corresponding to the measured SNR; and

transmitting the obtained mapping identifier to the base station.

17. The record medium of claim 16, wherein the method further comprises:

modulating and encoding, at the mobile terminal, data based on a modulation and coding method associated with the obtained mapping identifier;

combining the mapping identifier with the modulated and encoded data; and

transmitting the combined data to the base station, wherein the base station stores the same mapping table and demodulates and decodes the modulated and encoded data based on the transmitted mapping identifier and the stored mapping table.

18. The record medium of claim 16, wherein the method further comprises:

receiving the mapping table from the base station; and

storing the received mapping table in the mobile terminal.

19. A device for adaptive modulation and coding (AMC) for improving up-link performance in a mobile terminal, being in signal communication with a base station via a network, the device comprising:

means for receiving, at the mobile terminal, a signal from the base station, wherein the mobile terminal stores a mapping table which lists i) modulation and coding methods corresponding to a plurality of signal-to-noise ratios (SNRs) and ii) mapping identifiers associated with each modulation and coding method;

means for measuring an SNR of the received signal;

means for obtaining a mapping identifier corresponding to the measured SNR; and

means for transmitting the obtained mapping identifier to the base station