METHOD AND DEVICE FOR CONTINUOUS ADAPTATION OF CODING PARAMETERS TO A VARIABLE USER-DATA RATE

• US 20100254449A1
• Filed: 07/30/2009
• Published: 10/07/2010
• Est. Priority Date: 04/07/2009
• Status: Active Grant

• Current Assignee: Rohde & Schwarz GmbH & Company KG
• Original Assignee: Rohde & Schwarz GmbH & Company KG
• Inventors: Rusch-Ihwe, Jens
• Granted Patent: US 8,311,096 B2
• Time in Patent Office: Days
• US Class Current: 375/240.20
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H03M 13/15 Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes H03M13/17 takes precedence
• CPC Class Codes: H03M 13/1515 Reed-Solomon codes
• CPC Class Codes: H03M 13/2909 Product codes
• CPC Class Codes: H03M 13/2933 using a block and a convolutional code H03M13/2957 takes precedence
• CPC Class Codes: H03M 13/2972 Serial concatenation using convolutional component codes
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H04N 21/2383 Channel coding or modulation of digital bit-stream, e.g. QPSK modulation arrangements for detecting or preventing errors in the information received by adapting the channel coding H04L1/0009; analogue front ends or means for connecting modulators, demodulators or transceivers to a transmission line H04L27/0002
• CPC Class Codes: H04N 21/2404 Monitoring of server processing errors or hardware failure error or fault detection G06F11/07; monitoring in general G06F11/30
• CPC Class Codes: H04N 21/41407 embedded in a portable device, e.g. video client on a mobile phone, PDA, laptop constructional details of equipment or arrangements specially adapted for portable computer application G06F1/1626; arrangements specially adapted for mobile receivers in broadcast systems H04H20/57
• CPC Class Codes: H04N 21/6112 involving terrestrial transmission, e.g. DVB-T
• CPC Class Codes: H04N 21/6131 involving transmission via a mobile phone network wireless downlink channel access H04W74/006

Abstract

A method and a device for continuous adaptation of coding parameters to a variable user-data rate of a datastream composed of data frames. Data packets and ensembles are received and associated with services for mobile receivers. The transmission requirement of the next ensemble is determined based on the buffered data packets. Optimized coding parameters for the ensemble in the next data frame are then determined based on certain factors, such as the transmission requirement for the uncoded ensemble and the determined transmission capacity.

Claims

1. A method for the continuous automatic adaptation of coding parameters to a variable user-data rate of a datastream composed of data frames, comprising:

buffering, in a data buffer, data packets received and associated with individual services for mobile receivers and an ensemble associated with the respective service;

determining, on the basis of the data packets buffered in the data buffer, the transmission requirement of the respective ensemble for the next data frame in the datastream to be configured;

determining optimized coding parameters for the respective ensemble in the next data frame to be transmitted dependent upon the transmission requirement determined for the respective un-coded ensemble in the next data frame to be transmitted and the transmission capacity provided for the respective coded ensemble in the next data frame to be transmitted.

2. The method according to claim 1, wherein the optimization of the coding parameters includes the optimization of the coding rate of the Reed-Solomon code used as the external code of the data frame and/or the optimization of the coding rate of the convolutional code used as the internal code of the data frame.

3. The method according to claim 1, wherein the optimized coding parameters are determined by seeking the next highest transmission-capacity value for an un-coded ensemble in a data frame relative to the transmission requirement of the un-coded in tables, in which for various transmission-capacity values for a coded ensemble within a data frame and for various coding-parameter values, a previously-determined transmission-capacity value for an un-coded ATSC M/H ensemble is stored in a data frame.

4. The method according to claim 1, wherein the optimized coding parameters for the respective ensemble in the next data frame to be transmitted are determined from those data packets, which are buffered in the data buffers, of the associated ensemble up to the end of the transmission period of a second data sub-frame of the current data frame to be transmitted.

5. The method according to claim 1, wherein for the next data frame, a multiple number of five timeslots, which have so far been assigned to the transmission capacity of an ensemble, are assigned to the transmission capacity of another ensemble, if the reduced transmission requirement of the one ensemble and, at the same time, the increased transmission requirement of the other ensemble corresponds to the transmission capacity of the same multiple number of five timeslots.

6. The method according to claim 1, wherein the data packets associated with an ensemble within one data frame are coded according to the Reed-Solomon code and integrated in up to two Reed-Solomon data frames of the parade associated with the ensemble, and the two Reed-Solomon data frames of one parade are coded in each case with a different coding rate dependent upon the user-data volume packed in the respective Reed-Solomon data frame.

7. The method according to claim 1, wherein a mobile service with an increased transmission requirement at the transmission timing point of the next data frame is removed from the ensemble at the transmission timing point of the next data frame and integrated into another ensemble with a free transmission capacity corresponding to the increased transmission requirement of the mobile service at the transmission timing point of the next data frame.

8. The method according to claim 1, wherein each data frame is an ATSC-M/H data frame and/or each sub-frame is an ATSC-M/H sub-frame and/or each data packet is an ATSC-M/H data packet and/or each ensemble is an ATSC-M/H ensemble and/or each timeslot is an ATSC-M/H timeslot and/or each parade is an ATSC-M/H parade.

13. A computer-readable medium encoded with a computer program, which, when executed by a processor, causes the processor to perform the method according to claim 1.

9. A device for continuous adaptation of coding parameters to a variable user-data rate of a datastream composed of data frames with a number of data buffers corresponding to the number of mobile services for the buffering of data packets to be transmitted for the respective mobile service,

a control unit for monitoring the data packets buffered in the individual data buffers and for determining the number of timeslots of the next data frame to be transmitted for every ensemble composed of data packets of at least one mobile service and the coding parameter associated with the respective ensemble,

a processing unit for generating the data associated with the individual timeslots of the next data frame to be transmitted from the data packets buffered in the individual data buffers

and a multiplexer for generating a datastream with successive data frames from the timeslots filled with data.

10. The device according to claim 9, wherein a functional unit for receiving data packets associated with the individual mobile services and for the distribution of the data packets to the individual data buffers is provided.

11. The device according to claim 9, wherein a functional unit for generating a signalization channel for every data frame with the number of timeslots established for every ensemble by the control unit and the associated coding parameters is provided.

12. The device according to claim 9, wherein

each data frame is an ATSC-M/H data frame and/or

each sub-frame is an ATSC-M/H sub-frame and/or

each data packet is an ATSC-M/H data packet and/or

each ensemble is an ATSC-M/H ensemble and/or

each timeslot is an ATSC-M/H timeslot and/or

each parade is an ATSC-M/H parade.