Systems and methods for link adaption in wireless communication systems

• US 8,982,803 B1
• Filed: 11/05/2010
• Issued: 03/17/2015
• Est. Priority Date: 03/05/2009
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Inventors: Zhang, Hongyuan, Liu, Yong, Lou, Hui-Ling
• Primary Examiner(s): LIN, KENNY S
• Application Number:
  US12/940,413
• Time in Patent Office: 1,593 Days
• Field of Search: 370/329
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• 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 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0031 Multiple signaling transmission H04L1/1664, F15 take precedence
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001

Abstract

A first wireless device includes a transmitter and a receiver. The transmitter is configured to transmit a request for parameters to a second wireless device via a communication channel, wherein the parameters include at least one of (i) an estimated quality of the communication channel and (ii) a modulation and coding scheme (MCS) for transmission via the communication channel. The transmitter is further configured to, based on at least one of the parameters, select a MCS for transmission to the second wireless device via the communication channel. The receiver is configured to receive a response from the second wireless device via the communication channel, wherein the response includes the parameters.

Claims

1. A first wireless device, comprising:

a transmitter configured to

transmit a request, to a second wireless device via a communication channel, for the second wireless device to (i) perform link adaptation on the communication channel, wherein performing the link adaptation includes determining parameters associated with an estimated quality of the communication channel, and (ii) determine, based on the parameters, a preferred modulation and coding scheme (MCS); and

a receiver configured to receive a response from the second wireless device via the communication channel, wherein the response received by the receiver of the first wireless device includes the preferred MCS determined by the second wireless device and the parameters,

wherein the transmitter is further configured to, based on the preferred MCS determined by the second wireless device and received from the second wireless device at the first wireless device, select an MCS for transmission of data from the first wireless device to the second wireless device via the communication channel.

2. The first wireless device of claim 1, wherein the estimated quality of the communication channel includes a difference between (i) a signal-to-noise ratio (SNR) of the transmitted request and (ii) a minimum SNR for transmission via the communication channel.

3. The first wireless device of claim 1, wherein the transmitter selects a power level for transmission to the second wireless device via the communication channel based on at least one of the parameters.

4. The first wireless device of claim 1, wherein the communication channel includes a radio frequency (RF) spectrum ranging from 57 gigahertz (GHz) to 64 GHz.

5. The first wireless device of claim 1, wherein the MCS includes at least one of a modulation scheme and a data rate.

6. The first wireless device of claim 5, wherein the modulation scheme includes single carrier (SC) modulation or orthogonal frequency-division multiplexing (OFDM) modulation.

7. The first wireless device of claim 1, wherein the estimated quality of the communication channel includes at least one of (i) a signal-to-noise ratio (SNR), (ii) a receiver signal strength index (RSSI), and (iii) a channel strength index (CSI).

8. A system comprising:

the first wireless device of claim 1; and

the second wireless device.

9. The system of claim 8, wherein the second wireless device comprises:

a receiver configured to

receive the request from the first wireless device via the communication channel, and

determine the parameters based on the request; and

a transmitter configured to transmit the response to the first wireless device via the communication channel.

10. The system of claim 9, wherein the request is included in a first data packet.

11. The system of claim 10, wherein the request includes a sounding bit located in a preamble of the first data packet.

12. The system of claim 10, wherein the request is located in a transmitter training field or a receiver training field of the first data packet.

13. The system of claim 10, wherein the second wireless device determines the parameters based on the first data packet.

14. The system of claim 10, wherein the first wireless device transmits a second data packet subsequent to waiting a predetermined period after having transmitted the first data packet.

15. The system of claim 14, wherein the second wireless device determines the parameters based on the second data packet.

16. The system of claim 14, wherein:

the first data packet further includes a request for acknowledgement by the second wireless device; and

the second wireless device transmits an acknowledgement packet upon receiving the request for acknowledgement.

17. The system of claim 16, wherein the first wireless device transmits the second data packet subsequent to waiting the predetermined period after having received the acknowledgement packet.

18. A method, comprising:

transmitting a request, from a first wireless device to a second wireless device via a communication channel, for the second wireless device to (i) perform link adaptation on the communication channel, wherein performing the link adaptation includes determining parameters associated with an estimated quality of the communication channel, and (ii) determine, based on the parameters, a preferred modulation and coding scheme (MCS);

receiving a response from the second wireless device at the first wireless device via the communication channel, wherein the response received at the first wireless device includes the preferred MCS determined by the second wireless device and the parameters; and

based on the preferred MCS determined by the second wireless device and received from the second wireless device at the first wireless device, selecting an MCS for transmission of data from the first wireless device to the second wireless device via the communication channel.

19. The method of claim 18, wherein the estimated quality of the communication channel includes a difference between (i) a signal-to-noise ratio (SNR) of the transmitted request and (ii) a minimum SNR for transmission via the communication channel.

20. The method of claim 18, wherein the communication channel includes a radio frequency (RF) spectrum ranging from 57 gigahertz (GHz) to 64 GHz.