Method for implementing link self-adaptation, network device and terminal device

• US 9,509,463 B2
• Filed: 03/16/2012
• Issued: 11/29/2016
• Est. Priority Date: 03/31/2011
• Status: Active Grant

• Current Assignee: Nufront Mobile Communications Technology Company Limited
• Original Assignee: Nufront Mobile Communications Technology Company Limited
• Inventors: Bao, Dongshan, Yao, Huijuan, Wang, Jing, Liu, Shenfa, Pan, Lijun, Wang, Jiaqing, Yu, Xiaoyan, Yan, Zhigang
• Primary Examiner(s): O CONNOR, BRIAN T
• Application Number:
  US14/009,039
• Publication Number:
  US 20140286246A1
• Time in Patent Office: 1,719 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

Disclosed is a method for implementing link self-adaptation, comprising: sending a downlink sounding channel and a channel quality information CQI feedback resource indication; and receiving CQI information, and selecting a suitable transmission mode for downlink data transmission according to the CQI information. Further disclosed are a network device and a terminal device. By using the method and devices provided in the present invention, the spectrum utilization rate and system performance can be improved.

Claims

1. A method for implementing link adaptation, comprising:

sending, in a physical frame, a downlink sounding channel and a Channel Quality Information (CQI) feedback resource indication; and

receiving CQI in the physical frame, in which the CQI feedback resource indication is sent, and selecting a suitable transmission mode for downlink data transmission according to the CQI;

wherein the CQI feedback resource indication comprises an indication of resource allocated, and the indication of resource allocated comprises a symbol offset and a duration, wherein the symbol offset indicates a starting symbol of a user resource block, and the duration indicates a number of continuous symbols of the user resource block.

2. The method of claim 1, wherein, the CQI feedback resource indication further comprises an STA identity.

3. The method of claim 2, wherein, the indication of resource allocated further comprises at least one of subchannel mapping and a CQI transmission mode;

wherein,

the CQI transmission mode comprises a Modulation and Coding Scheme and a Number of Spatial Streams.

4. The method of claim 1, further comprising:

allocating, within a control channel at the physical layer, resources for periodically feeding back CQI, wherein the CQI feedback resource indication contains a feedback period length, which is used for instructing a user equipment to feed back the CQI periodically according to the feedback period length.

5. The method of claim 4, further comprising:

monitoring time, by the user equipment, according to the feedback period length, and directly feeding back the CQI once a feedback period elapses.

6. The method of claim 1, further comprising:

sending a CQI feedback request, which is used for instructing a user equipment to feed back the CQI.

7. The method of claim 6, wherein, sending a CQI feedback request specifically comprises:

packaging the CQI feedback request into an explorer frame on a MAC layer for sending, or indicating the CQI feedback request via a control channel on a physical layer.

8. The method of claim 6, further comprising:

feeding back, by the user equipment, the CQI via a feedback resource according to the CQI feedback resource indication in response to the CQI feedback request.

9. The method of claim 1, wherein, the CQI comprises one or more of:

a Modulation and Coding Scheme, which is used for identifying a modulation and coding scheme of the requested frequency band;

a coding type, which is used for identifying a coding mode recommended by a STA;

a Signal to Interference plus Noise Ratio, which is used for identifying an average Signal to Interference plus Noise Ratio of the requested bandwidth and spatial streams; and

subchannel mapping, which is used for identifying the bandwidth of a feedback subchannel and the sequence number of the corresponding specific subchannel.

10. The method of claim 9, wherein, the Modulation and Coding Scheme is divided into a first Modulation and Coding Scheme and a second Modulation and Coding Scheme.

11. A network device, comprising a processor and a storage device, wherein the storage device stores processor-executable programs, and the programs comprise:

a sending unit, for sending, in a physical frame, a downlink sounding channel and a Channel Quality Information (CQI) feedback resource indication;

a receiving unit, for receiving CQI in the physical frame, in which the CQI feedback resource indication is sent; and

a processing unit, for selecting a suitable transmission mode for downlink data transmission according to the CQI;

wherein the CQI feedback resource indication comprises an indication of resource allocated, and the indication of resource allocated comprises a symbol offset and a duration, wherein the symbol offset indicates a starting symbol of a user resource block, and the duration indicates a number of continuous symbols of the user resource block.

12. The network device of claim 11, wherein, the CQI feedback resource indication further comprises an STA identity, and the indication of resource allocated further comprises at least one of subchannel mapping and a COT transmission mode;

wherein;

the CQI transmission mode further comprises;

a Modulation and Coding Scheme and a Number of Spatial Streams.

13. The network device of claim 11, further comprising:

an allocating unit allocating, within a control channel at the physical layer, resources for periodically feeding back CQI, wherein, the CQI feedback resource indication comprises a feedback period length, which is used for instructing a user equipment to feed back the CQI periodically according to the feedback period length.

14. The network device of claim 11, wherein:

the sending unit is further adapted to send a CQI feedback request, which is used for instructing a user equipment to feed back the CQI in response to the CQI feedback request.

15. The network device of claim 11, wherein, the CQI comprises one or more of:

a Modulation and Coding Scheme MCS, which is used for identifying a modulation and coding scheme of the requested frequency band;

the Modulation and Coding Scheme is divided into a first Modulation and Coding Scheme and a second Modulation and Coding Scheme,

a coding type, which is used for identifying a coding mode recommended by a STA;

a Signal to Interference plus Noise Ratio, which is used for identifying an average Signal to Interference plus Noise Ratio of the requested bandwidth and spatial streams; and

subchannel mapping, which is used for identifying the bandwidth of a feedback subchannel and the sequence number of the corresponding specific subchannel.

16. A user equipment, comprising a processor and a storage device, wherein the storage device stores processor-executable programs, and the programs comprise:

a receiving unit, for receiving, in a physical frame, a downlink sounding channel and a Channel Quality Information (CQI) feedback resource indication;

a detecting unit, for detecting the downlink sounding channel and obtaining CQI; and

a feedback unit, for feeding back the CQI via a feedback resource in the physical frame, in which the CQI feedback resource indication is received;

wherein the CQI feedback resource indication comprises an indication of resource allocated, and the indication of resource allocated comprises a symbol offset and a duration, wherein the symbol offset indicates a starting symbol of a user resource block, and the duration indicates a number of continuous symbols of the user resource block.

17. The user equipment of claim 16, wherein, the CQI feedback resource indication further comprises an STA identity;

the indication of resource allocated specifically further comprises at least one of subchannel mapping and a CQI transmission mode;

wherein;

the CQI transmission mode contains a Modulation and Coding Scheme and a Number of Spatial Streams.

18. The user equipment of claim 16, wherein, the CQI feedback resource indication contains a feedback period length, which is used for instructing the user equipment to feed back the CQI periodically according to the feedback period length;

the feedback unit is adapted to monitor time according to the feedback period length, and directly feed back the CQI once a feedback period elapses.

19. The user equipment of claim 16, wherein, the CQI contains one or more of:

a Modulation and Coding Scheme, which is used for identifying a modulation and coding scheme of the requested frequency band;

a coding type, which is used for identifying a coding mode recommended by a STA;

a Signal to Interference plus Noise Ratio, which is used for identifying an average Signal to Interference plus Noise Ratio of the requested bandwidth and spatial streams; and

subchannel mapping, which is used for identifying the bandwidth of a feedback subchannel and the sequence number of the corresponding specific subchannel.

20. The user equipment of claim 19, wherein, the Modulation and Coding Scheme is divided into a first Modulation and Coding Scheme and a second Modulation and Coding Scheme.