CN100417055C - 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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- CN100417055C CN100417055C CNB021234302A CN02123430A CN100417055C CN 100417055 C CN100417055 C CN 100417055C CN B021234302 A CNB021234302 A CN B021234302A CN 02123430 A CN02123430 A CN 02123430A CN 100417055 C CN100417055 C CN 100417055C
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Abstract
The present invention discloses a method for CDMA mobile communication system synchronized channel framing, which sets long code state calculation steps in the process of the CDMA mobile communication system synchronoized channel framing and cyclic redundancy check bit calculation steps as an independent executing process, and divides the framing steps of synchronized channel superframe into a plurality of executing processes; the executing time of the independent executing processes respectively correspond to different times in the time length the synchronized channel superframe, and the number is integer M. The system determines time points of framing by random function, and executes corresponding framing operations; thus, the concentrate occupation of CPU sources is avoided so as to improve the real time of the system.
Description
Technical field
Ben Dingming relates to CDMA (code division multiple access) mobile communication technology, relates 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, need through framing, encode, interweave, 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 from 1 with step-length 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 from 1 with step-length 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, and is minimum to the disposal ability influence of system.
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. are through calculating, when synchronizing channel quantity is 3, select K1=6, K2=18, then all calculation procedures all independently exist in and to begin with RandOffsets, 6 being in the zone of unit, 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. 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 from 1 with step-length 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 |
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| CNB021234302A CN100417055C (en) | 2002-06-28 | 2002-06-28 | Synchronous channel framing method for CDMA mobile communication system |
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| CN1466299A CN1466299A (en) | 2004-01-07 |
| CN100417055C true 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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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Citations (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 |
| GB2321160A (en) * | 1996-12-09 | 1998-07-15 | Nokia Mobile Phones Ltd | Adaptive TDMA communication system |
| CN1189278A (en) * | 1995-06-26 | 1998-07-29 | 摩托罗拉公司 | Method and apparatus for time-scaling in communication products |
| 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
Patent Citations (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 |
| GB2321160A (en) * | 1996-12-09 | 1998-07-15 | Nokia Mobile Phones Ltd | Adaptive TDMA communication system |
| 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 |
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| CN1466299A (en) | 2004-01-07 |
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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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Granted publication date: 20080903 Termination date: 20170628 |