Dimming method, dimming device and computer storage medium

• US 9,716,550 B2
• Filed: 06/18/2014
• Issued: 07/25/2017
• Est. Priority Date: 12/30/2013
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Lv, Ning, Zhi, Zhou, Yu, Zhong
• Primary Examiner(s): Acolatse, Kodzovi
• Application Number:
  US15/108,630
• Publication Number:
  US 20160329962A1
• Time in Patent Office: 1,133 Days
• Field of Search: None
• CPC Class Codes: H04B 10/116 Visible light communication
• CPC Class Codes: H04L 12/46 Interconnection of networks
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling

Abstract

Disclosed are a dimming method, a dimming device and a computer storage medium. The method comprises: segmenting, on a Media Access Control (MAC) layer, a MAC Service Data Unit (MSDU) into multiple sub-MSDUs of the same length; encapsulating the sub-MSDUs after the segmentation into separate MAC Protocol Data Units (MPDUs), and separately generating a Compensation Frame (CF) for each MPDU according to a target brightness value of a light source; and aggregating the MPDUs and the CFs into a Physical Layer Service Data Unit (PSDU) of a Physical Layer Protocol Data Unit (PPDU) and transmitting the PPDU.

Claims

1. A dimming method, comprising:

dividing a Media Access Control (MAC) Service Data Unit (MSDU) into multiple sub-MSDUs with an equal length in a MAC layer;

encapsulating the divided sub-MSDUs into independent MAC Protocol Data Units (MPDUs) respectively, and generating a Compensatory Frame (CF) for each MPDU according to a target luminance value of a light source; and

aggregating each MPDU and a CF corresponding to the each MPDU into a Physical-layer Service Data Unit (PSDU) in a Physical-layer Protocol Data Unit (PPDU), and transmitting the PPDU,

wherein the dimming method further comprises;

before dividing the MSDU into the multiple sub-MSDUs with the equal length in the MAC layer,

determining whether a length of the MSDU is less than or equal to a difference in value between a maximum data length and a sum of a physical layer cost length and a MAC layer cost length, wherein the maximum data length is a product of a period T and a data rate of a link, and the period T is a reciprocal of a Critical Flicker Frequency (CFF).

2. The method according to claim 1, further comprising:

when the length of the MSDU is determined to be more than the difference in value between the maximum data length and the sum of the physical layer cost length and the MAC layer cost length,

re-dividing the MSDU into multiple sub-MSDUs with an equal length until the length of each obtained sub-MSDU is determined to be less than or equal to the difference in value between the maximum data length and the sum of the physical layer cost length and the MAC layer cost length.

3. The method according to claim 2, wherein generating the CF for each MPDU according to the target luminance value of the light source comprises:

generating the CF for each MPDU according to the target luminance value of the light source when an actual luminance value of the light source is determined to be different from the target luminance value of the light source.

4. The method according to claim 3, wherein generating the CF for each MPDU according to the target luminance value of the light source when the actual luminance value of the light source is determined to be different from the target luminance value of the light source comprises:

determining a length n_CF of a sequence of a Compensatory Frame Data (CFD) part of each CF according to the following formula;

5. The method according to claim 3, further comprising:

when the actual luminance value of the light source is determined to be the same as the target luminance value of the light source, encapsulating the divided sub-MSDUs into the independent MPDUs respectively; and

determining each MPDU as the PSDU of the PPDU, and transmitting the PPDU.

6. The method according to claim 3, further comprising:

after aggregating each MPDU and the CF corresponding to the each MPDU into the PSDU in the PPDU, determining whether a length of the PSDU obtained by aggregation is less than or equal to a difference in value between the maximum data length and the physical layer cost length.

7. The method according to claim 6, further comprising:

when the length of the PSDU obtained by aggregation is determined to be more than the difference in value between the maximum data length and the physical layer cost length,

re-dividing the MSDU into multiple sub-MSDUs with an equal length until the length of the PSDU obtained by aggregation according to each obtained sub-MSDU and a CF corresponding to the each sub-MSDU is less than or equal to the difference in value between the maximum data length and the physical layer cost length.

8. A dimming device, comprising:

a memory storing processor-executable instructions; and

a processor arranged to execute the stored processor-executable instructions to perform steps of;

dividing a Media Access Control (MAC) Service Data Unit (MSDU) into multiple sub-MSDUs with an equal length in a MAC layer;

encapsulating the divided sub-MSDUs into independent MAC Protocol Data Units (MPDUs) respectively, and generate a Compensatory Frame (CF) for each MPDU according to a target luminance value of a light source;

aggregating each MPDU and a CF corresponding to the each MPDU into a Physical-layer Service Data Unit (PSDU) in a Physical-layer Protocol Data Unit (PPDU), and transmitting the PPDU,

wherein the processor is arranged to execute the stored processor-executable instructions to further perform a step of;

before dividing the MSDU into the multiple sub-MSDUs with the equal length in the MAC layer, determining whether a length of the MSDU is less than or equal to a difference in value between a maximum data length and a sum of a physical layer cost length and a MAC layer cost length, wherein the maximum data length is a product of a period T and a data rate of a link, and the period T is a reciprocal of a Critical Flicker Frequency (CFF).

9. The dimming device according to claim 8, wherein the processor is arranged to execute the stored processor-executable instructions to further perform a step of:

when the length of the MSDU is determined to be more than the difference in value between the maximum data length and the sum of the physical layer cost length and the MAC layer cost length, dividing the MSDU into multiple sub-MSDUs with an equal length until the length of each obtained sub-MSDU is determined to be less than or equal to the difference in value between the maximum data length and the sum of the physical layer cost length and the MAC layer cost length.

10. The dimming device according to claim 9, wherein generating the CF for each MPDU according to the target luminance value of the light source comprises:

generating the CF for each MPDU according to the target luminance value of the light source when an actual luminance value of the light source is determined to be different from the target luminance value of the light source.

11. The dimming device according to claim 10, wherein generating the CF for each MPDU according to the target luminance value of the light source when the actual luminance value of the light source is determined to be different from the target luminance value of the light source comprises:

determining a length n_CF of a sequence of a Compensatory Frame Data (CFD) part of each CF according to the following formula;

12. The dimming device according to claim 10, wherein the processor is arranged to execute the stored processor-executable instructions to further perform steps of:

when the actual luminance value of the light source is determined to be the same as the target luminance value of the light source, encapsulating the divided sub-MSDUs into the independent MPDUs respectively;

determining each MPDU as the PSDU of the PPDU, and transmitting the PPDU.

13. The dimming device according to claim 10, wherein the processor is arranged to execute the stored processor-executable instructions to further perform a step of:

after aggregating each MPDU and the CF corresponding to the each MPDU into the PSDU in the PPDU, determining whether a length of the PSDU obtained by aggregation is less than or equal to a difference in value between the maximum data length and the physical layer cost length.

14. The dimming device according to claim 13, wherein the processor is arranged to execute the stored processor-executable instructions to further perform a step of:

when the length of the PSDU obtained by aggregation is determined to be more than the difference in value between the maximum data length and the physical layer cost length, re-dividing the MSDU into multiple sub-MSDUs with an equal length until the length of the PSDU obtained by aggregation according to each obtained sub-MSDU and a CF corresponding to the each sub-MSDU is less than or equal to the difference in value between the maximum data length and the physical layer cost length.

15. A non-transitory computer storage medium having stored therein a computer-executable instruction being configured to execute a dimming method, the dimming method comprising:

dividing a Media Access Control (MAC) Service Data Unit (MSDU) into multiple sub-MSDUs with an equal length in a MAC layer;

encapsulating the divided sub-MSDUs into independent MAC Protocol Data Units (MPDUs) respectively, and generating a Compensatory Frame (CF) for each MPDU according to a target luminance value of a light source; and

aggregating each MPDU and a CF corresponding to the each MPDU into a Physical-layer Service Data Unit (PSDU) in a Physical-layer Protocol Data Unit (PPDU), and transmitting the PPDU,

wherein the dimming method further comprises;

before dividing the MSDU into the multiple sub-MSDUs with the equal length in the MAC layer,

determining whether a length of the MSDU is less than or equal to a difference in value between a maximum data length and a sum of a physical layer cost length and a MAC layer cost length, wherein the maximum data length is a product of a period T and a data rate of a link, and the period T is a reciprocal of a Critical Flicker Frequency (CFF).