Communication method and communications apparatus
This application provides a communication method and a communications apparatus. The method includes: determining a system frame number of a radio system frame in which a to-be-sent first broadcast channel PBCH is located, to obtain a first transport block, where the first processing manner is used to indicate some bits of the system frame number of the radio system frame in which the first PBCH is located, and the first MIB includes remaining bits, other than the some bits, of the system frame number of the radio system frame in which the first PBCH is located; and sending, by using the first PBCH, the first transport block in the radio system frame.
1. A communication method, comprising:
scrambling information bits of a physical broadcast channel (PBCH), using one segment of a plurality of segments of a pseudo-random sequence, to obtain a transport block, wherein the one segment of the plurality of segments of the pseudo-random sequence corresponds to a part of bits of a system frame number of a radio system frame in which the PBCH is located, the part of bits including only 2 nd and 3 rd least significant bits of the system frame number; and
sending the transport block using the PBCH.
2. The communication method according to claim 1 , wherein the information bits of the PBCH comprise bits other than the 2 nd and 3 rd least significant bits of the system frame number of the radio system frame in which the PBCH is located.
3. The communication method according to claim 1 , wherein the one segment of the plurality of segments of the pseudo-random sequence is one of four segments of a pseudo-random sequence which correspond to the 2 nd and 3 rd least significant bits of the system frame number.
4. The communication method according to claim 3 , wherein the four segments of the pseudo-random sequence are based on one initialization seed for initializing the pseudo-random sequence.
5. The communication method according to claim 3 , wherein the four segments of the pseudo-random sequence comprise a first segment of the pseudo-random sequence, a second segment of the pseudo-random sequence, a third segment of the pseudo-random sequence, and a fourth segment of the pseudo-random sequence, wherein:
the 2 nd and 3 rd least significant bits implicitly indicated by the first segment of the pseudo-random sequence are 00, the 2 nd and 3 rd least significant bits implicitly indicated by the second segment of the pseudo-random sequence are 01, the 2 nd and 3 rd least significant bits implicitly indicated by the third segment of the pseudo-random sequence are 10, and the 2 nd and 3 rd least significant bits implicitly indicated by the fourth segment of the pseudo-random sequence are 11.
6. The communication method according to claim 1 , wherein the PBCH corresponding to the system frame number is sent on one or both of a first half-frame or a second half-frame of the radio system frame.
7. The communication method according to claim 6 , wherein the first half-frame or the second half-frame on which the PBCH is sent is indicated using a demodulation reference signal (DMRS) sequence.
8. The communication method according to claim 6 , wherein the first half-frame or the second half-frame on which the PBCH is sent is indicated by one bit in the information bits of the PBCH.
9. The communication method according to claim 1 , wherein the PBCH is comprised in a synchronization signal block (SSB).
10. The communication method according to claim 1 , wherein the information bits of the PBCH include information bits of a master information block (MIB).
11. An apparatus, comprising:
a processor configured to scramble information bits of a physical broadcast channel (PBCH), using one segment of a plurality of segments of a pseudo-random sequence, to obtain a transport block, wherein the one segment of the plurality of segments of the pseudo-random sequence corresponds to a part of bits of a system frame number of a radio system frame in which the PBCH is located, the part of bits including only 2 nd and 3 rd least significant bits of the system frame number; and
a transceiver configured to send the transport block using the PBCH.
12. The apparatus according to claim 11 , wherein the information bits of the PBCH comprise bits other than the 2 nd and 3 rd least significant bits of the system frame number of the radio system frame in which the PBCH is located.
13. The apparatus according to claim 11 , wherein the one segment of the plurality of segments of the pseudo-random sequence is one of four segments of a pseudo-random sequence which correspond to the 2 nd and 3 rd least significant bits of the system frame number.
14. The apparatus according to claim 13 , wherein the four segments of the pseudo-random sequence are based on one initialization seed for initializing the pseudo-random sequence.
15. The apparatus according to claim 13 , wherein the four segments of the pseudo-random sequence comprise a first segment of the pseudo-random sequence, a second segment of the pseudo-random sequence, a third segment of the pseudo-random sequence, and a fourth segment of the pseudo-random sequence, wherein:
the 2 nd and 3 rd least significant bits implicitly indicated by the first segment of the pseudo-random sequence are 00, the 2 nd and 3rd least significant bits implicitly indicated by the second segment of the pseudo-random sequence are 01, the 2 nd and 3 rd least significant bits implicitly indicated by the third segment of the pseudo-random sequence are 10, and the 2 nd and 3 rd least significant bits implicitly indicated by the fourth segment of the pseudo-random sequence are 11.
16. The apparatus according to claim 11 , wherein the PBCH corresponding to the system frame number is sent on one or both of a first half-frame or a second half-frame of the radio system frame.
17. The apparatus according to claim 16 , wherein the first half-frame or the second half-frame on which the PBCH is sent is indicated using a demodulation reference signal (DMRS) sequence.
18. The apparatus according to claim 16 , wherein the first half-frame or the second half-frame on which the PBCH is sent is indicated by one bit in the information bits of the PBCH.
19. The apparatus according to claim 11 , wherein the PBCH is comprised in a synchronization signal block (SSB).
20. The apparatus according to claim 11 , wherein the information bits of the PBCH include information bits of a master information block (MIB).
21. An apparatus, comprising:
at least one processor in communication with a memory, the at least one processor configured, upon execution of the instructions of the memory, to perform the following steps:
scramble information bits of a physical broadcast channel (PBCH), using one segment of a plurality of segments of a pseudo-random sequence, to obtain a transport block, wherein the one segment of the plurality of segments of the pseudo-random sequence corresponds to a part of bits of a system frame number of a radio system frame in which the PBCH is located, the part of bits including only 2 nd and 3 rd least significant bits of the system frame number; and
send the transport block using the PBCH.
22. The apparatus according to claim 21 , wherein the one segment of the plurality of segments of the pseudo-random sequence is one of four segments of a pseudo-random sequence which correspond to the 2 nd and 3 rd least significant bits of the system frame number.
23. The apparatus according to claim 22 , wherein the four segments of the pseudo-random sequence are based on one initialization seed for initializing the pseudo-random sequence.
24. The apparatus according to claim 22 , wherein the four segments of the pseudo-random sequence comprise a first segment of the pseudo-random sequence, a second segment of the pseudo-random sequence, a third segment of the pseudo-random sequence, and a fourth segment of the pseudo-random sequence, wherein:
the 2 nd and 3 rd least significant bits implicitly indicated by the first segment of the pseudo-random sequence are 00, the 2 nd and 3 rd least significant bits implicitly indicated by the second segment of the pseudo-random sequence are 01, the 2 nd and 3 rd least significant bits implicitly indicated by the third segment of the pseudo-random sequence are 10, and the 2 nd and 3 rd least significant bits implicitly indicated by the fourth segment of the pseudo-random sequence are 11.
25. The apparatus according to claim 21 , wherein the PBCH corresponding to the system frame number is sent on one or both of a first half-frame or a second half-frame of the radio system frame;
the first half-frame or the second half-frame on which the PBCH is sent is indicated using a demodulation reference signal (DMRS) sequence; or
the first half-frame or the second half-frame on which the PBCH is sent is indicated by one bit in the information bits of the PBCH.
26. An apparatus, comprising:
at least one processor in communication with a memory, the at least one processor configured, upon execution of instructions of the memory, to perform the following steps:
receive a physical broadcast channel (PBCH) from a network device; and
process a transport block carried by the PBCH by descrambling the transport block to obtain information bits of the PBCH, the descrambling performed by using one segment of a plurality of segments of a pseudo-random sequence, wherein the one segment of the plurality of segments of the pseudo-random sequence corresponds to a part of bits of a system frame number of a radio system frame in which the PBCH is located, the part of bits including only 2 nd and 3 rd least significant bits of the system frame number.
27. The apparatus according to claim 26 , wherein the one segment of the plurality of segments of the pseudo-random sequence is one of four segments of a pseudo-random sequence which correspond to the 2nd and 3rd least significant bits of the system frame number.
28. The apparatus according to claim 27 , wherein the four segments of the pseudo-random sequence are based on one initialization seed for initializing the pseudo-random sequence.
29. The apparatus according to claim 27 , wherein the four segments of the pseudo-random sequence comprise a first segment of the pseudo-random sequence, a second segment of the pseudo-random sequence, a third segment of the pseudo-random sequence, and a fourth segment of the pseudo-random sequence, wherein:
the 2nd and 3rd least significant bits implicitly indicated by the first segment of the pseudo-random sequence are 00, the 2nd and 3rd least significant bits implicitly indicated by the second segment of the pseudo-random sequence are 01, the 2nd and 3rd least significant bits implicitly indicated by the third segment of the pseudo-random sequence are 10, and the 2nd and 3rd least significant bits implicitly indicated by the fourth segment of the pseudo-random sequence are 11.
30. The apparatus according to claim 26 , wherein the PBCH corresponding to the system frame number is received on one or both of a first half-frame or a second half-frame of the radio system frame
the first half-frame or the second half-frame on which the PBCH is received is indicated by a demodulation reference signal (DMRS) sequence; or
the first half-frame or the second half-frame on which the PBCH is received is indicated by one bit in the information bits of the PBCH.