CN1466299A - Synchronous channel framing method for CDMA mobile communication system - Google Patents
Synchronous channel framing method for CDMA mobile communication system Download PDFInfo
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- CN1466299A CN1466299A CNA021234302A CN02123430A CN1466299A CN 1466299 A CN1466299 A CN 1466299A CN A021234302 A CNA021234302 A CN A021234302A CN 02123430 A CN02123430 A CN 02123430A CN 1466299 A CN1466299 A CN 1466299A
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- 238000009432 framing Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 19
- 238000010295 mobile communication Methods 0.000 title claims abstract description 14
- 238000005516 engineering process Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
This invention discloses a method for CDMA mobile communication system synchronous channel framing which is to design the long code status computing step and circulation redundant code check bit computing step as an independent executing process, to divide the superframe framing steps to multiple independent, executing process executing time scale of which is corresponding to different time scales in a synchronous channel superframe time length, the number is integer M. The system decides framing time scale point by random function and carries out corresponding framing operation avoiding centralized occupation to CPU resource.
Description
Technical field
The present invention relates to CDMA (code division multiple access) mobile communication technology, relate in particular to synchronous channel framing method in the CDMA mobile communication system.
Background technology
To the mobile communication system that the CDMA technology that is proposed based on U.S. Qualcomm company is constructed, generally be divided into two essential parts, i.e. terminal equipment and system equipment.Terminal equipment is commonly referred to as cell phone type equipment, is called MS (Mobile Station); System equipment is commonly referred to as base station system, is called BSS (BaseStation System).
Synchronizing channel is a kind of spread-spectrum signal that cdma base station system sends, and is continuously sent by BSS, and is received by MS, is used for the MS that the area of coverage works and obtains initial time synchronized.The speed of synchronizing channel is 1200bps (bits per second), and a synchronizing channel frame length is 26.666...ms (millisecond), and a sync channel superframe is made of three synchronizing channel frames, and length is 80ms.
The content of synchronizing channel is determined by Sync Channel Message, and message comprises the content of 3 parts, i.e. 8 bit MSG_LENGTH (message-length territory) field, elongated message body and 30 bit CRC (CRC).Synchronizing channel will aloft send, and needs through framing, encodes, interweaves, spread spectrum and modulation, could form spread-spectrum signal.
In the cdma system synchronous channel framing stage, comprise the operation of 3 aspects altogether:
(1), calculates long code state LC_STATE according to system time SYS_TIME.
(2) additional 8 bit message length field indication, and calculate 30 bit CRC, computing formula is:
G(X)＝X
30+X
29+X
21+X
20+X
15+X
13+X
12+X
11+X
8+X
7+X
6+X
2+X+1
(3) head at each synchronizing channel frame carries out shifting function, and adds the indication of 1 bit synchronous channel frame original position, forms 3 sync channel superframes.
More than work and realize by software by system.At present, for the processor Motorola MPC860 that communication equipment generally adopts, actual measurement can get: step (1) and (2) needed time less are about tens microseconds; And step (3) needs for up to 2 to 3 milliseconds, in this case, owing to take many CPU (central processing unit) resource, the real-time of system is caused bigger influence.Especially to the system of many sectors, owing to there are a plurality of synchronizing channels, this influence is more serious.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, provide a kind of and avoid carrying out in the framing operation set and to the taking of cpu resource, to improve the synchronous channel framing method of system real time.
For achieving the above object, the technical solution used in the present invention is: a kind of CDMA mobile communication system synchronous channel framing method, long code state calculation procedure and CRC position calculation procedure in the operation of CDMA mobile communication system synchronous channel framing are set to an independent implementation, the framing step of sync channel superframe is divided into a plurality of independent implementations, the execution of these a plurality of independent implementations corresponds respectively to the interior different moment of time span of a sync channel superframe constantly, and quantity is integer M;
System's certain execution cycle in every interval produces framing initial offset values RandOffsets constantly by random function;
Compose a synchronizing channel index value SyncIndex for each synchronizing channel, value is from 0 initial integer; Each synchronizing channel is calculated framing T constantly by following steps:
Make variable i be incremented to the needed framing of synchronizing channel number N constantly with step-length 1 from ｀ 1, and circulation is carried out: the value that produces a random integers Rands and calculate framing moment T is RandOffsets+K1* (i-1)+Rands+K2* SyncIndex, wherein, K1, K2 are integer constant;
If system time arrives framing moment point T mod M, then carry out the corresponding constantly framing operation of this framing.After adopting said method, the framing step of the sync channel superframe that processing delay is bigger is changed into timesharing from the concentrative implementation of prior art and is carried out, mode with random distribution determines concrete the execution constantly, avoided the concentrated of cpu resource taken, thus the real-time of raising system.
Embodiment
CDMA mobile communication system synchronous channel framing method of the present invention, long code state calculation procedure and CRC position calculation procedure in the operation of CDMA mobile communication system synchronous channel framing are set to an independent implementation, the framing step of sync channel superframe is divided into a plurality of independent implementations, the execution of these a plurality of independent implementations corresponds respectively to the interior different moment of time span of a sync channel superframe constantly, and quantity is integer M;
System's certain execution cycle in every interval produces framing initial offset values RandOffsets constantly by random function;
Compose a synchronizing channel index value SyncIndex for each synchronizing channel, value is from 0 initial integer; Each synchronizing channel is calculated framing T constantly by following steps:
Make variable i be incremented to the needed framing of synchronizing channel number N constantly with step-length 1 from ｀ 1, and circulation is carried out: the value that produces a random integers Rands and calculate framing moment T is RandOffsets+K1* (i-1)+Rands+K2* SyncIndex, wherein, K1, K2 are integer constant;
If system time arrives framing moment point T mod M, then carry out the corresponding constantly framing operation of this framing.
In concrete the enforcement, determine that preferably wherein the span and the choosing of integer constant K1, K2 of random function are key points, when the distance between all calculation levels was maximum, discrete effect was best, the time system the disposal ability influence minimum.
As preferred version of the present invention, the quantity M of described synchronous channel framing independence implementation is 64; Framing initial offset values RandOffsets span constantly is an integer 1 to 8; The needed framing of described synchronizing channel number N constantly is 3; Described random integers Rands span is 0 to 5; Integer constant K1=6, K2=18.Through calculating, when synchronizing channel quantity is 3, select K1=6, K2=18, then all calculation procedures all independently exist in RandOffsets and begin, and are in the zone of unit with 6, and each zone has only an operation at most, and the average distance between the operation is 6.
In the present invention program's enforcement, described execution cycle can be 60 seconds.
Claims (3)
1, a kind of CDMA mobile communication system synchronous channel framing method, it is characterized in that: long code state calculation procedure and CRC position calculation procedure in the operation of CDMA mobile communication system synchronous channel framing are set to an independent implementation, the framing step of sync channel superframe is divided into a plurality of independent implementations, the execution of these a plurality of independent implementations corresponds respectively to the interior different moment of time span of a sync channel superframe constantly, and quantity is integer M;
System's certain execution cycle in every interval produces framing initial offset values RandOffsets constantly by random function;
Compose a synchronizing channel index value SyncIndex for each synchronizing channel, value is from 0 initial integer; Each synchronizing channel is calculated framing T constantly by following steps:
Make variable i be incremented to the needed framing of synchronizing channel number N constantly with step-length 1 from ｀ 1, and circulation is carried out: the value that produces a random integers Rands and calculate framing moment T is RandOffsets+K1* (i-1)+Rands+K2* SyncIndex, wherein, K1, K2 are integer constant;
If system time arrives framing moment point T mod M, then carry out the corresponding constantly framing operation of this framing.
2, CDMA mobile communication system synchronous channel framing method as claimed in claim 1 is characterized in that: the quantity M of described synchronous channel framing independence implementation is 64; Framing initial offset values RandOffsets span constantly is an integer 1 to 8; The needed framing of described synchronizing channel number N constantly is 3; Described random integers Rands span is 0 to 5; Integer constant K1=18, K2=6.
3, CDMA mobile communication system synchronous channel framing method as claimed in claim 1 or 2 is characterized in that: described execution cycle is 60 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021234302A CN100417055C (en) | 2002-06-28 | 2002-06-28 | Synchronous channel framing method for CDMA mobile communication system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021234302A CN100417055C (en) | 2002-06-28 | 2002-06-28 | Synchronous channel framing method for CDMA mobile communication system |
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| Publication Number | Publication Date |
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| CN1466299A true CN1466299A (en) | 2004-01-07 |
| CN100417055C CN100417055C (en) | 2008-09-03 |
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| CNB021234302A Expired - Fee Related CN100417055C (en) | 2002-06-28 | 2002-06-28 | Synchronous channel framing method for CDMA mobile communication system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299446C (en) * | 2004-05-01 | 2007-02-07 | 中兴通讯股份有限公司 | A method of frame synchronization for wireless interface of time division communication system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5363404A (en) * | 1993-07-13 | 1994-11-08 | Motorola Inc. | Apparatus and method for conveying information in a communication network |
| CN1189278A (en) * | 1995-06-26 | 1998-07-29 | 摩托罗拉公司 | Method and apparatus for time-scaling in communication products |
| GB2321160B (en) * | 1996-12-09 | 2001-05-16 | Nokia Mobile Phones Ltd | Packet data |
| CN1250294A (en) * | 1999-07-27 | 2000-04-12 | 邮电部武汉邮电科学研究院 | Adaption method for fusion of Ethernet with synchronizing digital system or synchronizing optical network |
-
2002
- 2002-06-28 CN CNB021234302A patent/CN100417055C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299446C (en) * | 2004-05-01 | 2007-02-07 | 中兴通讯股份有限公司 | A method of frame synchronization for wireless interface of time division communication system |
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| CN100417055C (en) | 2008-09-03 |
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| ASS | Succession or assignment of patent right |
Owner name: EAST COMMUNICATION CO., LTD. Free format text: FORMER OWNER: DONGFANG COMMUNICATION SCI-TECH DEVELOPMENT CO., LTD. Effective date: 20051125 |
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Effective date of registration: 20051125 Address after: 310013 No. 398, Hangzhou, Wensanlu Road Applicant after: Dongfang Communication Co., Ltd. Address before: 100085 two street, Beijing, Haidian District Applicant before: Dongfang Communication Sci. & Tech. Dev. Co., Ltd. |
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Assignee: Putian East Communications Group Co., Ltd. Assignor: Dongfang Communication Co., Ltd. Contract fulfillment period: 2008.10.10 to 2018.10.9 Contract record no.: 2008330002185 Denomination of invention: Synchronous channel framing method for CDMA mobile communication system Granted publication date: 20080903 License type: Exclusive license Record date: 20081120 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.10.10 TO 2018.10.9; CHANGE OF CONTRACT Name of requester: PUTIAN DONGFANG COMMUNICATION GROUP CO.,LTD. Effective date: 20081120 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080903 Termination date: 20170628 |