Method and apparatus for data transmission in PON, and system

1 . A method, comprising:

receiving, by an optical line terminal (OLT), a first data stream, wherein the first data stream comprises a first data frame, and the first data frame carries a first service;

slicing, by the OLT, the first data frame to generate a plurality of first slices, wherein a length of each first slice of the plurality of first slices is a first preset length, and each of the plurality of first slices is sliced from the first data frame; and

sending, by the OLT, a second data stream to an optical network unit (ONU), wherein the second data stream comprises the plurality of first slices, a time period in which the OLT sends the second data stream comprises a plurality of consecutive scheduling periods, at least a part of a time period in each scheduling period of the plurality of consecutive scheduling periods is occupied by at least one first slice of the plurality of first slices, and at least one time interval between at least two consecutive first slices of the plurality of first slices is completely or partially used to transmit data carrying a second service.

2 . The method according to claim 1 , wherein in each scheduling period of the plurality of consecutive scheduling periods, the at least one first slice sent in the respective scheduling period occupies a first preset slot, and each first preset slot satisfies at least one of having a fixed duration or having a fixed slot central position.

3 . The method according to claim 1 , wherein the first data stream further comprises a second data frame carrying the second service, and the method further comprises:

slicing, by the OLT, the second data frame to generate a plurality of second slices, wherein a length of each second slice of the plurality of second slices is the first preset length, wherein the second data stream further comprises the plurality of second slices, and the at least one time interval between the at least two consecutive first slices of the plurality of first slices is completely or partially used to transmit at least one second slice of the plurality of second slices.

4 . The method according to claim 3 , wherein in each scheduling period of the plurality of consecutive scheduling periods, at least one second slice is sent in the respective scheduling period and occupies a second preset slot, and each second preset slot satisfies at least one of having a fixed duration or having a fixed slot central position.

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

generating, by the OLT, at least one first idle frame, wherein a length of each first idle frame of the at least one first idle frame is the first preset length, wherein the second data stream further comprises the at least one first idle frame, the at least one time interval between the at least two consecutive first slices of the plurality of first slices is completely or partially used to transmit the at least one first idle frame, and each first idle frame of the at least one first idle frame occupies a second preset slot in a scheduling period of the plurality of consecutive scheduling periods.

6 . The method according to claim 1 , wherein the first data frame comprises a first payload, and slicing, by the OLT, the first data frame to generate the plurality of first slices comprises:

dividing, by the OLT, the first payload into at least two parts when a length of the first payload is greater than a second preset length, wherein a second payload is generated correspondingly to each part of the at least two parts, a length of the second payload is equal to the second preset length, and the second preset length is less than the first preset length; and

adding, by the OLT, a frame header to each second payload to form the plurality of first slices, wherein any one of the second payloads satisfies one of the following condition 1 and condition 2:

condition 1: the second payload comprises a part obtained by dividing the first payload; or condition 2: the second payload comprises a part obtained by dividing the first payload and a padding bit.

7 . The method according to claim 1 , wherein the first data frame is an Ethernet frame or an optical data unit (ODU) frame.

8 . The method according to claim 1 , wherein:

the first data frame comprises a first service identifier, and the first service identifier identifies the first service; or

the OLT determines, based on an upstream port that receives the first data frame, the first service identifier or the first service carried in the first data frame.

9 . The method according to claim 8 , wherein:

at least one first slice comprises the first service identifier; or

the OLT sends at least one first slice through a first downstream PON port associated with the first service.

10 . A method, comprising:

receiving, by an optical network unit (ONU), a second data stream sent by an optical line terminal (OLT), wherein the second data stream comprises a plurality of first slices, a length of each first slice of the plurality of first slices is a first preset length, the plurality of first slices carries a first service, a time period in which the ONU receives the second data stream comprises a plurality of consecutive scheduling periods, at least a part of a time period in each scheduling period of the plurality of consecutive scheduling periods is occupied by at least one first slice, at least one time interval between at least two consecutive first slices of the plurality of first slices is completely or partially used to transmit data carrying a second service, and each first slice of the plurality of first slices comprises a second payload;

identifying, by the ONU, each first slice of the plurality of first slices, and extracting the second payload in each first slice; and

reassembling, by the ONU, the extracted second payloads to generate a first data frame.

11 . The method according to claim 10 , wherein in each scheduling period of the plurality of consecutive scheduling periods, the at least one first slice sent in the respective scheduling period occupies a first preset slot, and each first preset slot satisfies at least one of having fixed duration or having a fixed slot central position.

12 . The method according to claim 10 , wherein the second data stream further comprises a plurality of second slices, a length of each second slice of the plurality of second slices is the first preset length, the plurality of second slices carries the second service, the at least one time interval is completely or partially used to transmit at least one second slice of the plurality of second slices, each second slice of the plurality of second slices comprises a fourth payload, and the method further comprises:

identifying, by the ONU, each second slice of the plurality of second slices, and extracting the fourth payload in each second slice; and

reassembling, by the ONU, the extracted fourth payloads to generate a second data frame.

13 . The method according to claim 12 , wherein in each scheduling period, the at least one second slice sent in the respective scheduling period occupies a second preset slot, and each second preset slot satisfies at least one of having fixed duration or having a fixed slot central position.

14 . The method according to claim 10 , wherein the second data stream further comprises at least one first idle frame, a length of each first idle frame of the at least one first idle frame is the first preset length, the at least one time interval is completely or partially used to transmit the at least one first idle frame, and each first idle frame of the at least one first idle frame occupies a second preset slot in a scheduling period of the plurality of consecutive scheduling periods.

15 . An apparatus, comprising:

a memory storing instructions;

a transceiver; and

at least one processor coupled to the memory and the transceiver, and configured to execute the instructions, and wherein executing the instructions causes the apparatus to:

receive a first data stream, wherein the first data stream comprises a first data frame, and the first data frame carries a first service;

slice the first data frame to generate a plurality of first slices, wherein a length of each first slice of the plurality of first slices is a first preset length, and each of the plurality of first slices is sliced from the first data frame; and

send a second data stream, wherein the second data stream comprises the plurality of first slices, a time period in which the apparatus sends the second data stream comprises a plurality of consecutive scheduling periods, at least a part of a time period in each scheduling period of the plurality of consecutive scheduling periods is occupied by at least one first slice of the plurality of first slices, and at least one time interval between at least two consecutive first slices is completely or partially used to transmit data carrying a second service.

16 . The apparatus according to claim 15 , wherein in each scheduling period of the plurality of consecutive scheduling periods, the at least one first slice sent in the respective scheduling period occupies a first preset slot, and each first preset slot satisfies at least one of having fixed duration or having a fixed slot central position.

17 . The apparatus according to claim 15 , wherein the first data stream further comprises a second data frame for carrying the second service, the second data stream further comprises a plurality of second slices, and the at least one time interval between the at least two consecutive first slices is completely or partially used to transmit at least one second slice of the plurality of second slices; and

wherein executing the instructions further causes the apparatus to slice the second data frame to generate the plurality of second slices, and a length of each second slice of the plurality of second slices is the first preset length.

18 . The apparatus according to claim 15 , wherein executing the instructions further causes the apparatus to generate at least one first idle frame, wherein a length of each first idle frame of the at least one first idle frame is the first preset length; and

wherein the second data stream further comprises the at least one first idle frame, the at least one time interval is completely or partially used to transmit the at least one first idle frame, and each first idle frame of the at least one first idle frame occupies a second preset slot in a scheduling period of the plurality of consecutive scheduling periods.

19 . An apparatus, comprising:

a memory storing instructions;

a transceiver; and

at least one processor coupled to the memory and the transceiver, configured to execute the instructions, and wherein executing the instructions causes the apparatus to:

receive a second data stream sent by an optical line terminal (OLT), wherein the second data stream comprises a plurality of first slices, a length of each first slice of the plurality of first slices is a first preset length, the plurality of first slices carries a first service, a time period in which the second data stream is received comprises a plurality of consecutive scheduling periods, at least a part of a time period in each scheduling period of the plurality of consecutive scheduling periods is occupied by at least one first slice of the plurality of first slices, at least one time interval between at least two consecutive first slices of the plurality of first slices is completely or partially used to transmit data carrying a second service, and each first slice of the plurality of first slices comprises a second payload;

identify each first slice of the plurality of first slices, and extract the second payload in each first slice; and

reassemble the extracted second payloads to generate a first data frame.

20 . The apparatus according to claim 19 , wherein the second data stream further comprises a plurality of second slices, a length of each second slice of the plurality of second slices is the first preset length, the plurality of second slices carries the second service, the at least one time interval is completely or partially used to transmit at least one second slice of the plurality of second slices, and each second slice of the plurality of second slices comprises a fourth payload; and

wherein executing the instructions further causes the apparatus to identify each second slice of the plurality of second slices, extract the fourth payload in each second slice, and reassemble the extracted fourth payloads to generate a second data frame.