Method and apparatus for mapping and de-mapping service data

A method for de-mapping service data, comprising:

• receiving a data frame, extracting valid service data in the data frame according to a payload value in the data frame, and storing the valid service data in a storage unit, wherein the payload value is calculated in a transmitting end according to the service data in a current frame group of which the data frame belongs to, and the payload value is configured to indicate an amount of service data carried by corresponding containers in a next frame group;
• obtaining distribution of valid service data in a certain time cycle according to the payload value in the data frame;
• generating a data writing clock according to the distribution of the valid service data, performing a homogenization treatment on the data writing clock, and obtaining the data writing virtual clock;
• comparing a non-gap statistical quantity of the data writing virtual clock with a non-gap statistical quantity of the service clock gap, and generating a de-mapping clock gap according to the comparison result;
• generating a service clock gap according to a de-mapping clock gap;
• performing a phase-locked loop process on the de-mapping clock gap, so as to obtain a recovery clock signal required by a de-mapping process;
• and
• reading the service data from the storage unit according to the obtained recovery clock signal,
• wherein the comparing the non-gap statistical quantity of the data writing virtual clock with the non-gap statistical quantity of the service clock gap, and generating the de-mapping clock gap according to the comparison result comprises:
• counting a non-gap quantity of the data writing virtual clock to obtain a non-gap statistical quantity of the data writing virtual clock, and counting a non-gap quantity of the service clock gap to obtain a non-gap statistical quantity of the service clock gap;
• and
• when the non-gap statistical quantity of the data writing virtual clock is greater than the non-gap statistical quantity of the service clock gap, indicating that the de-mapping clock gap is a fast preformed scheduling pattern;
• and when the non-gap statistical quantity of the data writing virtual clock is smaller than the non-gap statistical quantity of the service clock gap, indicating that the de-mapping clock gap is a slow preformed scheduling pattern.

An apparatus for generating a de-mapping clock, comprising:

• a virtual clock statistic unit, configured to receive a data frame, obtain a data writing virtual clock according to a payload value in the data frame, and accumulate a non-gap quantity of the data writing virtual clock to obtain a non-gap statistical quantity of the data writing virtual clock, wherein the payload value is calculated in the transmitting end according to service data to be transmitted in a current frame group of which the data frame belongs to, and the payload value is used to indicate an amount of service data carried by corresponding containers in a next group of data frames;
• a service gap statistic unit, configured to generate a service clock gap according to a de-mapping clock gap, and accumulate a non-gap quantity of the service clock gap to obtain a non-gap statistical quantity of the service clock gap;
• a comparison unit, configured to compare the non-gap statistical quantity of the data writing virtual clock with the non-gap statistical quantity of the service clock gap, and obtain a comparison result;
• a de-mapping clock gap generating unit, configured to generate the de-mapping clock gap according to the comparison result;
• and
• a recovery clock generating unit, configured to perform a phase-locked loop process on the de-mapping clock gap, so as to obtain a recovery clock signal required by a de-mapping process,
• wherein the de-mapping clock gap generating unit comprises:
• a second buffer module, configured to buffer a fast preformed scheduling pattern and a slow preformed scheduling pattern;
• and
• a gap generating module, configured to output the fast preformed scheduling pattern stored by the second buffer module when indication information output by the comparison unit indicates that the non-gap statistical quantity of the data writing virtual clock is greater than the non-gap statistical quantity of the service clock gap;
• and output the slow preformed scheduling pattern stored by the second buffer module when the indication information output by the comparison unit indicates that the non-gap statistical quantity of the data writing virtual clock is smaller than the non-gap statistical quantity of the service clock gap.

An apparatus for de-mapping service data, comprising:

• a virtual clock statistic unit, configured to receive a data frame, obtain a data writing virtual clock according to a payload value in the data frame, and accumulate a non-gap quantity of the data writing virtual clock to obtain a non-gap statistical quantity of the data writing virtual clock, wherein the payload value is calculated in the transmitting end according to service data to be transmitted in a current frame group of which the data frame belongs to, and the payload value is used to indicate an amount of service data carried by corresponding containers in a next group of data frames;
• a service gap statistic unit, configured to generate a service clock gap according to a de-mapping clock gap, and accumulate a non-gap quantity of the service clock gap to obtain a non-gap statistical quantity of the service clock gap;
• a comparison unit, configured to compare the non-gap statistical quantity of the data writing virtual clock with the non-gap statistical quantity of the service clock gap, and obtain a comparison result;
• a de-mapping clock gap generating unit, configured to generate the de-mapping clock gap according to the comparison result;
• a recovery clock generating unit, configured to perform a phase-locked loop process on the de-mapping clock gap, so as to obtain a recovery clock signal required by a de-mapping process;
• and
• a reading and writing unit, configured to extract valid service data in the data frame according to the payload value in the data frame, buffer the valid service data, and read the valid service data according to the recovery clock signal generated by the recovery clock generating unit,
• wherein the virtual clock statistic unit comprises:
• a clock generating module, configured to know distribution of the valid service data in a certain time cycle according to the payload value in the data frame, and generate a data writing clock according to the distribution of the valid service data;
• a virtual clock generating module, configured to perform a homogenization treatment on the data writing clock obtained by the clock generating module, and obtain the data writing virtual clock;
• and
• a statistical module, configured to accumulate the non-gap quantity of the data writing virtual clock to obtain the non-gap statistical quantity of the data writing virtual clock.