CN101166365B - A system information mapping method in mobile communication downlink synchronization system - Google Patents

A system information mapping method in mobile communication downlink synchronization system Download PDF

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CN101166365B
CN101166365B CN2007101473178A CN200710147317A CN101166365B CN 101166365 B CN101166365 B CN 101166365B CN 2007101473178 A CN2007101473178 A CN 2007101473178A CN 200710147317 A CN200710147317 A CN 200710147317A CN 101166365 B CN101166365 B CN 101166365B
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sequence number
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夏树强
杨扬
梁春丽
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ZTE Corp
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Abstract

A system information mapping method in a mobile communication downlink synchronous system includes all usable sequence number set Y={0,1,2,...,N-1}, wherein N is a positive number which carries ID information set of all the sector groups including x pieces of information. The sequence S1(t),S2(t),S3(t),S4(t) carry the ID information t (t belongs to X) of any sector group in the ID information sets of all the section groups and frame timing information. The method includes steps: selecting m1,m2,m3,m4 elements from sequence number set to construct sequence Pi, wherein Pi={Pi(0),Pi(1),...,Pi(mi-1)},1<=i<=4; then, sending out assistant synchronizing channel sequence with sequence number groups of {S1(t),S2(t)} for the first time; and sending out the assistant synchronizing channel sequence with the sequence number groups of {S3(t),S4(t)} for second time; wherein the values of S1(t),S2(t),S3(t),S4(t) are determined by Si(t)=Pi(yi), wherein yi=t mod mi,, and yi belongs to [0,mi-1], and i=1,2,3,4. Avoiding dual collisions of SSCH sequence from occurring so as to lower probability single collision furthest, the invention is easy of implementation, and convenient for detecting by the receiving end.

Description

The mapping method of system information in a kind of mobile communication downlink synchronization system
Technical field
The present invention relates to communication system, relate more specifically to the mapping method of system information in a kind of mobile communication downlink synchronization system.
Background technology
In GSM, usually exist and use many groups of special sequences to carry the requirement of an ensemble of communication, for example in the synchro system of mobile telecommunication system down link, the situation of using synchronizing sequence to carry cell set ID.
It is the function of carrying out Cell searching that the downlink synchronization system of mobile communication mainly acts on, and its objective is in order to obtain regularly and other relevant system informations.Usually synchronizing channel is divided into two parts: primary synchronization channel (Primary Synchronization Channel is called for short PSCH) and auxiliary synchronization channel (Secondary Synchronization Channel is called for short SSCH); Auxiliary synchronization channel is generally formed in the frequency domain cascade by the binary sequence of two N length, is carrying cell set id information and frame timing information.
The problem that in the process of Cell searching, has the collision of SSCH sequence.Suppose total X cell group information of information that SSCH need carry, Y frame timing information then need carry X*Y bar information altogether, that is to say, we need select the X*Y bar and carry information in all possible SSCH sequence.As X*Y during greater than N, one in two short codes that SSCH uses is certain to reused by different sub-districts, and like this, the SSCH sequence that neighbor cell sends just might bump, thus the performance of deterioration Cell searching.For example, the SSCH sequence of Target cell use is by 2 binary sequence S 1And S 2Form, adjacent have 2 interfered cells to use S respectively 1, S 3And S 2, S 3As the SSCH sequence, the SSCH sequence that then when SSCH detects, receives is the stack of 3 sub-districts, S 1And S 3Energy the strongest, then the SSCH of Target cell is detected as S 1And S 3, detect failure.And in a radio frames, to send twice the SSCH sequence, and if rationally do not shine upon the SSCH sequence, the two situation of bumping that all bump in the time of might causing sending SSCH twice.Common this collision can solve through the way of using scrambling or interweave, but, also can reduce generation, the especially generation of two collisions of collision through the mapping relations of rational arrangement sub-district id information and SSCH sequence.
In sum; How sub-district id information and frame timing information are mapped as the sequence number of two SSCH short codes through simple mode; Make the convenient detection of receiving terminal UE; Be easy to SN recovery sub-district id information and extraction frame timing information, and two collisions of the least possible generation are the technology that needs to be resolved hurrily through two short codes.
Summary of the invention
Technical problem to be solved by this invention provides the mapping method of system information in a kind of mobile communication downlink synchronization system, avoids the generation of two collisions of SSCH sequence fully, has farthest reduced the probability of single collision.
In order to address the above problem, the invention provides the mapping method of system information in a kind of mobile communication downlink synchronization system, comprise the sequence number set Y={0 of all operational sequences; 1,2 ..., N-1}; N is a positive number, carries all cell set id information set and comprises x information, sequence S 1(t), S 2(t), S 3(t), S 4(t) carry arbitrary cell set id information t in the set of all cell set id informations (t ∈ 0,1,2 ..., x-1}) and frame timing information, may further comprise the steps,
A, from sequence number set, choose m 1, m 2, m 3, m 4Individual element, tectonic sequence P i, P i={ P i(0), P i(1), P i(2) ..., P i(mi-1) }, 1≤i≤4;
B, transmission be the auxiliary synchronization channel sequence for the first time, and its sequence number group is (S 1(t), S 2(t)); With the transmission auxiliary synchronization channel sequence second time, its sequence number group is (S 3(t), S 4(t)); Wherein, S 1(t), S 2(t), S 3(t), S 4(t) value S i(t) by S i(t)=P i(y i) confirm, wherein, y i=tmodm i, y i∈ [0, m i-1], i=1,2,3,4;
Wherein, m i≤N, wherein 1≤i≤4; And m 1And m 2Relatively prime, m 3And m 4Relatively prime; And m 1* m 2>=x, m 3* m 4>=x; And
Figure DEST_PATH_GSB00000614746100011
Figure DEST_PATH_GSB00000614746100012
Further, said method also can comprise, behind the said step b, recovers the cell set id information and the frame timing information that carry according to the sequence number group that receives.
Further, said method also can comprise, may further comprise the steps,
C1, receive sequence number group (S a, S b);
C2, if S a∈ P 1And S b∈ P 2, what then receive is the auxiliary synchronization channel sequence of sending for the first time, for receiving sequence S a, S b, find it at P 1, P 2In sequence number y 1', y 2'; If S a∈ P 3And S b∈ P 4, what then receive is the auxiliary synchronization channel sequence of sending for the second time, for receiving sequence S a, S b, find it at P 3, P 4In sequence number y 3', y 4';
C3, calculating G 1=m 1* m 2, G 2=m 3* m 4Calculate M 1=G 1/ m 1, M 2=G 1/ m 2, M 3=G 2/ m 3, M 4=G 2/ m 4Find M i', make it satisfied (M i* M i') mod m i=1; Calculate k i=M i* M i'.
Further, said method also can comprise, behind said step c3, further comprise,
If frame timing information is the auxiliary synchronization channel sequence of sending for the first time, then
t＝(y 1′*k 1+y 2′*k 2)mod?G 1。
Further, said method also can comprise, behind said step c3, further comprise,
If frame timing information is the auxiliary synchronization channel sequence of sending for the second time, then
t＝(y 3′*k 3+y 4′*k 4)mod?G 2。
Further, said method can comprise that also among the said step b, the auxiliary synchronization channel sequence of twice transmission is identical at the carrier position of frequency domain, S 1(t) and S 3(t) corresponding carrier position is identical, S 2(t) and S 4(t) corresponding carrier position is identical.
Further, said method also can comprise, said m 1Be 13, said m 2Be 17, said m 3Be 16, said m 4Be 15.
Compared with prior art, use the present invention, avoid the generation of two collisions of SSCH sequence fully, farthest reduced the probability of single collision, and simple, make things convenient for receiving terminal UE to detect.
Description of drawings
Fig. 1 is the frame assumption diagram of a kind of descending synchronous signal channel in the specific embodiment of the invention;
Fig. 2 is the flow chart of the mapping method of system information in the specific embodiment of the invention;
Fig. 3 is that system information is mapped to sequence number group S in the specific embodiment of the invention 1(t), S 2(t), S 3(t), S 4(t) flow chart;
Fig. 4 is by the sequence number group (S that receives in the specific embodiment of the invention a, S b) recover the flow chart of its entrained system information.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the invention is described further.
Fig. 1 has described a kind of frame structure of descending synchronous signal channel in the specific embodiment of the invention, can find out that the sequence number combination that the SSCH sequence is sent twice, twice transmission altogether in first subframe and the 6th sub-frame is respectively (S 1(t), S 2(t)), (S 3(t), S 4(t)).
The sequence number set of supposing all operational sequences is Y, wherein comprises N bar sequence, Y={0 then, and 1,2 ..., N-1}, N are positive numbers;
All the cell set id informations set that need carry is X, wherein comprises x information, i.e. X={0, and 1,2 ..., x-1}, x are positive numbers;
Arbitrary cell set id information t (t ∈ X) and frame timing information are by sequence S among the X 1(t), S 2(t), S 3(t), S 4(t) carry.
To launch twice the SSCH sequence in the radio frames, suppose that article one short code sequence number of the SSCH sequence use of transmission for the first time is respectively S 1(t), the second sequence number is S 2Article one short code sequence number that the SSCH sequence of (t), sending is for the second time used is S 3(t), the second sequence number is S 4(t).The SSCH of twice transmission is identical at the carrier position of frequency domain, S 1(t) and S 3(t) corresponding carrier position is identical, S 2(t) and S 4(t) corresponding carrier position is identical.
As shown in Figure 2, information t and frame timing information are mapped to S 1(t), S 2(t), S 3(t), S 4(t) step is described below:
Step 210, from the set of the sequence number of all operational sequences, choose m iIndividual element, tectonic sequence P i
From set Y, choose m iIndividual element, tectonic sequence P i
For example, choose m 1, m 2, m 3, m 4Individual element, tectonic sequence P i, P i={ P i(0), P i(1), P i(2) ..., P i(m i-1) }, 1≤i≤4.m iChoose and P iStructure to satisfy below several rules:
m i≤N，1≤i≤4。
m 1And m 2Relatively prime, m 3And m 4Relatively prime.
m 1*m 2≥x，m 3*m 4≥x。
Figure G071E7317820070827D000051
Step 220, transmission be the auxiliary synchronization channel sequence for the first time, and its sequence number group is (S 1(t), S 2(t)); With the transmission auxiliary synchronization channel sequence second time, its sequence number group (S 3(t), S 4(t)); Wherein, S 1(t), S 2(t), S 3(t), S 4(t) value S i(t) by S i(t)=P i(y i) confirm, wherein, y i=t mod m i, y i∈ [0, m i-1], i=1,2,3,4;
The SSCH sequence of twice transmission is identical at the carrier position of frequency domain, S 1(t) and S 3(t) corresponding carrier position is identical, S 2(t) and S 4(t) corresponding carrier position is identical.
Step 230, Receive sequence number group (S a, S b);
Sequence number group (the S that step 240, basis receive a, S b) recover cell set id information t and the frame timing information carry.
A, calculating G 1=m 1* m 2, G 2=m 3* m 4
B, calculating M 1=G 1/ m 1, M 2=G 1/ m 2, M 3=G 2/ m 3, M 4=G 2/ m 4Find M i', make it satisfied (M i* M i') mod m i=1; Calculate k i=M i* M i';
If C, judgment frame timing information are S a∈ P 1And S b∈ P 2, what then receive is the SSCH sequence of sending for the first time, for receiving sequence S a, S b, find it at P 1, P 2In sequence number y 1', y 2'; If S a∈ P 3And S b∈ P 4, what then receive is the SSCH sequence of sending for the second time, for receiving sequence S a, S b, find it at P 3, P 4In sequence number y 3', y 4';
For other situation, be judged as the Receive sequence number faults, wait for next time receiving.
D, if frame timing information be the SSCH sequence of sending for the first time, calculating
t＝(y 1′*k 1+y 2′*k 2)mod?G 1；
If frame timing information is the SSCH sequence of sending for the second time, calculate
t＝(y 3′*k 3+y 4′*k 4)mod?G 2。
Since in real system is used, the sequence number group quantity N of required cell set id information quantity X that carries and use, the sequence number m that uses in each sequence number group iAll be the number of confirming, thus parameter k iAll confirm, thus in the practical application by sequence number group S 1(t), S 2(t), S 3(t), S 4When (t) recovering cell set id information t, the calculating of steps A and B can calculated in advance exist in the receiver well, and the actual step of carrying out only needs C, and D is very effective for reducing complexity.
For normally used X=170 cell set id information, the short code sequence length 31 that SSCH uses is recommended operation parameter m 1=13, m 2=17, m 3=16, m 4=15.This parameter selection method obviously satisfies above-mentioned selection m 1, m 2, m 3, m 43 rules, and because m 1, m 2, m 3, m 4All relatively prime, can avoid the generation of two collisions of SSCH sequence fully, farthest reduced the probability of single collision.
Below in conjunction with instantiation the present invention is described further.
Under the general case, cell set id information X=170, i.e. X={0,1,2 ..., 169}, the SSCH sequence short code of use has the N=31 bar, Y={0,1,2,3 ... 30}.
Fig. 3 has described system information and how to be mapped to sequence number group S 1(t), S 2(t), S 3(t), S 4(t) flow process.
Step 310, choose m iIndividual element, tectonic sequence P i
The parameter m of recommending 1=13, m 2=17, m 3=16, m 4=15, P iStructure following, P 1=0,1,2 ..., 12}, P 2=14,15,16 ..., 30}, P 3=15,16,17 ..., 30}, P 4=0,1,2 ..., 14}.
Step 320, transmission be the auxiliary synchronization channel sequence for the first time, and its sequence number group is (S 1(t), S 2(t)); With the transmission auxiliary synchronization channel sequence second time, its sequence number group (S 3(t), S 4(t)); Wherein, S 1(t), S 2(t), S 3(t), S 4(t) value S i(t) by S i(t)=P i(y i) confirm, wherein, y i=t mod m i, y i∈ [0, m i-1], i=1,2,3,4.
Confirm that according to frame timing information two short codes of sending are S 1(t), S 2(t) still be S 3(t), S 4(t).
Suppose it is the SSCH sequence of sending for the second time, use S 3(t), S 4(t), utilize
S i(t)=P i(y i), y wherein i=t mod m i, y i∈ [0, m i-1] calculates
S 3(t)＝P 3(y 3)，y 3＝t?mod16；
S 4(t)＝P 4(y 4)，y 4＝t?mod15。
Fig. 4 has described how by the sequence number group (S that receives a, S b) recover the flow process of its entrained system information.
Step 410, receive sequence number group (S a, S b);
Receive sequence number and be (3,23), i.e. S a=3, S b=23.
Step 420, recovery frame timing information;
S 1′＝S a＝3，S 2′＝S b＝23；
Step 430, calculating G 1, G 2, k 1, k 2, k 3, k 4
Calculate G 1=m 1* m 2=13*17=221.
Calculate M 1=G 1/ m 1=221/13=17, M 2=G 2/ m 2=221/17=13; Find M i', make it satisfied (M i* M i') mod m i=1, M here 1'=10, M 2'=4; Calculate k 1=M 1* M 1'=17*10=170, k 2=M 2* M 2'=13*4=52.
Step 440, basis (S a, S b) the judgment frame timing information, recover the cell set id information.
S a∈ P 1And S b∈ P 2, be the signal of the SSCH sequence of the transmission first time.
S a∈ P 3And S b∈ P 4, be the signal of the SSCH sequence of the transmission second time.
For other situation, be judged as the Receive sequence number faults, wait for next time receiving.
According to S a=3 and S b=23, it is at P 1And P 2In sequence number be respectively 3 and 9, calculate y 1'=3, y 2'=9.
Calculate t=(y 1' * k 1+ y 2' * k 2) mod G 1=(3*170+9*52) mod 221=94.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (7)

1. the mapping method of system information in the mobile communication downlink synchronization system comprises, the sequence number set Y={0 of all operational sequences, and 1,2 ..., N-1}, N are positive numbers, carry all cell set id informations set and comprise x information, sequence S 1(t), S 2(t), S 3(t), S 4(t) carry arbitrary cell set id information t in the set of all cell set id informations (t ∈ 0,1,2 ..., x-1}) and frame timing information, it is characterized in that, may further comprise the steps,
A, from sequence number set, choose m 1, m 2, m 3, m 4Individual element, tectonic sequence P i, P i={ P i(0), P i(1), P i(2) ..., P i(m i-1) }, 1≤i≤4;
B, transmission be the auxiliary synchronization channel sequence for the first time, and its sequence number group is (S 1(t), S 2(t)); With the transmission auxiliary synchronization channel sequence second time, its sequence number group is (S 3(t), S 4(t)); Wherein, S 1(t), S 2(t), S 3(t), S 4(t) value S i(t) by S i(t)=P i(y i) confirm, wherein, y i=tmodm i, y i∈ [0, m i-1], i=1,2,3,4;
Wherein, m i≤N, 1≤i≤4; And m 1And m 2Relatively prime, m 3And m 4Relatively prime; And m 1* m 2>=x, m 3* m 4>=x; And
Figure FSB00000614746000011
Figure FSB00000614746000012
2. the method for claim 1 is characterized in that, behind the said step b, recovers the cell set id information and the frame timing information that carry according to the sequence number group that receives.
3. method as claimed in claim 2 is characterized in that, may further comprise the steps,
C1, receive sequence number group (S a, S b);
C2, if S a∈ P 1And S b∈ P 2, what then receive is the auxiliary synchronization channel sequence of sending for the first time, for receiving sequence S a, S b, find it at P 1, P 2In sequence number y 1', y 2'; If S a∈ P 3And S b∈ P 4, what then receive is the auxiliary synchronization channel sequence of sending for the second time, for receiving sequence S a, S b, find it at P 3, P 4In sequence number y 3', y 4';
C3, calculating G 1=m 1* m 2, G 2=m 3* m 4Calculate M 1=G 1/ m 1, M 2=G 1/ m 2, M 3=G 2/ m 3, M 4=G 2/ m 4Find M ' i, make it satisfied (M i* M ' i) modm i=1; Calculate k i=M i* M ' i
4. method as claimed in claim 3 is characterized in that, behind said step c3, further comprises,
If frame timing information is the auxiliary synchronization channel sequence of sending for the first time, then
t＝(y 1′*k 1+y 2′*k 2)mod?G 1。
5. method as claimed in claim 3 is characterized in that, behind said step c3, further comprises,
If frame timing information is the auxiliary synchronization channel sequence of sending for the second time, then
t＝(y 3′*k 3+y 4′*k 4)mod?G 2。
6. the method for claim 1 is characterized in that, among the said step b, the auxiliary synchronization channel sequence of twice transmission is identical at the carrier position of frequency domain, S 1(t) and S 3(t) corresponding carrier position is identical, S 2(t) and S 4(t) corresponding carrier position is identical.
7. the method for claim 1 is characterized in that, said m 1Be 13, said m 2Be 17, said m 3Be 16, said m 4Be 15.
CN2007101473178A 2007-08-14 2007-08-14 A system information mapping method in mobile communication downlink synchronization system Expired - Fee Related CN101166365B (en)

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