Message transmission method and device
A message transmission method and device relating to the field of communications technologies are described that improve an anti-interference capability in message transmission. The method includes generating a scrambling code according to a scrambling code initialization seed, wherein the scrambling code initialization seed meets the following expression: c init =R·2 a 7 +P·(n f mod k +1)·2 b 7 and then scrambling a message according to the scrambling code. The method further includes sending the scrambled message to a terminal on a physical downlink shared channel. Because the first time parameter has different values at at least two different moments, scrambling codes determined at the at least two corresponding different moments are different. Therefore, a possibility at which the base station uses a same scrambling code to scramble a same system message repeatedly in a time period is reduced, so that an anti-interference capability in system message transmission is improved.
1. A message sending method, comprising:
generating a scrambling code according to a scrambling code initialization seed c init , wherein the scrambling code initialization seed meets the following expression:
c
init
=
k
1
8
n
RNTI
·
2
b
8
+
(
k
7
N
ID
N
c
e
I
l
+
k
8
)
(
k
9
n
RNTI
+
k
10
)
[
(
k
1
1
n
f
+
k
12
⌊
n
s
/
2
⌋
+
k
13
)
mod
k
14
+
k
1
5
]
u
2
·
2
c
8
+
k
1
6
N
ID
N
c
e
l
l
+
k
17
wherein k 18 , k 7 , k 8 , k 9 , k 10 , k 11 , k 12 , k 13 , k 14 , k 15 , k 16 , k 17 , b 8 , u 2 and c 8 are non- negative integers, n RNTI is a wireless network temporary identity, N ID Ncell is a cell identity, n f is a radio frame number, and n s is a slot number, and wherein k 18 =0, k 8 =1, k 9 =1, k 10 =1, k 11 =10, k 12 =1, k 13 =0, k 14 is a prime number, k 15 =1, k 16 =1, k 17 =0, u 2 =1 and c 8 =9;
scrambling a first message according to the scrambling code; and
sending the scrambled first message on a first channel starting from a slot of a radio frame indicated by the slot number and the radio frame number.
2. The method according to claim 1 , wherein the first message is one or more of the group consisting of: a data message, a part of a data message, an encoded data message, and a part of encoded data message.
3. The method according to claim 1 , wherein the first channel is a physical downlink shared channel.
4. The method according to claim 3 , wherein k 14 is 61.
5. The method according to claim 1 , wherein the first channel is a physical uplink shared channel.
6. The method according to claim 1 , wherein the scrambling a first message according to the scrambling code is a symbol-level scrambling.
7. A message receiving method, comprising:
generating a scrambling code according to a scrambling code initialization seed c init , wherein the scrambling code initialization seed meets the following expression:
c
init
=
k
18
n
RNTI
·
2
b
8
+
(
k
7
N
ID
N
c
e
l
l
+
k
8
)
(
k
9
n
RNTI
+
k
10
)
[
(
k
11
n
f
+
k
12
⌊
n
s
/
2
⌋
+
k
1
3
)
mod
k
14
+
k
15
]
u
2
·
2
c
8
+
k
16
N
ID
N
c
e
l
l
+
k
17
wherein k 18 , k 7 , k 8 , k 9 , k 10 , k 11 , k 12 , k 13 , k 14 , k 15 , k 16 , k 17 , b 8 , u 2 and c 8 are non- negative integers, n RNTI is a wireless network temporary identity, N ID Ncell is a cell identity, n f is a radio frame number, and n s is a slot number, and wherein k 18 =0, k 8 =1, k 9 =1, k 10 =1, k 11 =10, k 12 =1, k 13 =0, k 14 is a prime number, k 15 =1, k 16 =1, k 17 =0, 2=1 and c 8 =9;
receiving a scrambled first message on a first channel starting from a slot of a radio frame indicated by the slot number and the radio frame number; and
descrambling the scrambled first message according to the scrambling code to obtain a first message.
8. The method according to claim 7 , wherein the first message is one or more of the group consisting of: a data message, a part of a data message, an encoded data message, and a part of encoded data message.
9. The method according to claim 7 , wherein the first channel is a physical downlink shared channel.
10. The method according to claim 9 , wherein k 14 is 61.
11. The method according to claim 7 , wherein the first channel is a physical uplink shared channel.
12. The method according to claim 7 , wherein the descrambling the scrambled first message according to the scrambling code is a symbol-level descrambling.
13. An apparatus, comprising:
at least one processor; and
at least one computer readable memories coupled to the at least one processor and storing instructions that, when the instructions are performed by the at least one processor, cause the apparatus to:
generate a scrambling code according to a scrambling code initialization seed c init , wherein the scrambling code initialization seed meets the following expression:
c
init
=
k
18
n
RNTI
·
2
b
8
+
(
k
7
N
ID
N
c
e
l
l
+
k
8
)
(
k
9
n
RNTI
+
k
0
)
[
(
k
11
n
f
+
k
12
⌊
n
s
/
2
⌋
+
k
1
3
)
mod
k
4
+
k
15
]
u
2
·
2
c
8
+
k
16
N
ID
N
c
e
l
l
+
k
17
wherein k 18 , k 7 , k 8 , k 9 , k 10 , k 11 , k 12 , k 13 , k 14 , k 15 , k 16 , k 17 , b 8 , u 2 and c 8 are non- negative integers, n RNTI is a wireless network temporary identity, N ID Ncell is a cell identity, n f is a radio frame number, and n s is a slot number, and wherein k 18 =0, k 8 =1, k 9 =1, k 10 =1, k 11 =10, k 12 =1, k 13 =0, k 14 is a prime number, k 15 =1, k 16 =1, k 17 =0, u 2 =1 and c 8 =9;
scramble a first message according to the scrambling code; and
send the scrambled first message on a first channel starting from a slot of a radio frame indicated by the slot number and the radio frame number.
14. The apparatus according to claim 13 , wherein the first message is one or more of the group consisting of: a data message, a part of a data message, an encoded data message, and a part of encoded data message.
15. The apparatus according to claim 13 , wherein the first channel is a physical downlink shared channel k 14 .
16. The apparatus according to claim 13 , wherein the scrambling a first message according to the scrambling code is a symbol-level scrambling.
17. An apparatus, comprising:
at least one processor; and
at least one computer readable memories coupled to the at least one processor and storing instructions that, when the instructions are performed by the at least one processor, cause the apparatus to:
generate a scrambling code according to a scrambling code initialization seed c init , wherein the scrambling code initialization seed meets the following expression:
c
init
=
k
1
8
n
RNTI
·
2
b
8
+
(
k
7
N
ID
N
c
e
I
l
+
k
8
)
(
k
9
n
RNTI
+
k
10
)
[
(
k
1
1
n
f
+
k
12
⌊
n
s
/
2
⌋
+
k
3
)
mod
k
4
+
k
1
5
]
u
2
·
2
c
8
+
k
1
6
N
ID
N
c
e
l
l
+
k
17
wherein k 18 , k 7 , k 8 , k 9 , k 10 , k 11 , k 12 , k 13 , k 14 , k 15 , k 16 , k 17 , b 8 , u 2 and c 8 are non- negative integers, n RNTI is a wireless network temporary identity, N ID Ncell is a cell identity, n f is a radio frame number, and n s is a slot number, and wherein k 18 =0, k 8 =1, k 9 =1, k 10 =1, k 11 =10, k 12 =1, k 13 =0, k 14 is a prime number, k 15 =1, k 16 =1, k 17 =0, u 2 =1 and c 8 =9;
receive a scrambled first message on a first channel starting from a slot of a radio frame indicated by the slot number and the radio frame number; and
descramble the scrambled first message according to the scrambling code to obtain a first message.
18. The apparatus according to claim 17 , wherein the first message is one or more of the group consisting of: a data message, a part of a data message, an encoded data message, and a part of encoded data message.
19. The apparatus according to claim 17 , wherein the first channel is a physical downlink shared channel k 14 .
20. The apparatus according to claim 17 , wherein the descrambling the scrambled first message according to the scrambling code is a symbol-level descrambling.