CN1426246A - Timed synchronizing method in general block radio business - Google Patents
Timed synchronizing method in general block radio business Download PDFInfo
- Publication number
- CN1426246A CN1426246A CN01142668A CN01142668A CN1426246A CN 1426246 A CN1426246 A CN 1426246A CN 01142668 A CN01142668 A CN 01142668A CN 01142668 A CN01142668 A CN 01142668A CN 1426246 A CN1426246 A CN 1426246A
- Authority
- CN
- China
- Prior art keywords
- pcu
- bts
- frame
- radio block
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
This invention puts forwards a timing synchronous method for general grouping radio service including 1.PUC unit generates self radio block number at start to be sent to BTS via down-stream PCU frame 2, PCU calcualtes the next radio block number 3. judging if BTS has received the PCU frame, if so, to step 4, if not, proceeding to step 7. 4. BTS solves radio block number in PCU frame 5. calculating present BTS radio block number 6. calculating difference between the two block numbers 7. judging if should send, step 6 calculated difference to PCU if not, continue to step 8, or to step 9, 8). Process other tasks then turne to step 3 9. the difference calcualted in step 6 is sent to PCU unit, in up-line PCU frame which calculate the block number and return to steep 2.
Description
Technical field
The present invention relates in the field of mobile communication GPRS (hereinafter to be referred as GPRS, GeneralPacket Radio Service), specifically, relate to a kind of packet control unit of in GPRS, realizing (hereinafter to be referred as the PCU unit, Packet Control Unit, down with) and base transceiver station BTS (BaseTransceiver Station) between frame number and radio block number synchronous method.
Background technology
At present, in field of mobile communication, GPRS packet switching mobile data network is obtaining application more and more widely, also more and more demonstrates its ability of meeting the need of market and superiority, is also replacing existing gsm system gradually and becomes the main flow of mobile communication.GPRS packet switching mobile data network (hereinafter to be referred as GPRS) is based on GSM mobile phone network, increase by two network functional entities, i.e. the mobile data network of Serving GPRS Support Node SGSN (Serving GPRS Support Node) and Gateway GPRS Support Node GGSN (GatewayGPRS Support Node) formation.It still adopts GSM frequency and existing infrastructure, compares with the mobile data services that GSM provides, and GPRS can form local mobile data network and wide area mobile data network easily, also can be interconnected with the Internet net easily.Because GPRS adopts dynamic space channel allocation mode, a plurality of data users can share a wireless channel simultaneously, have therefore improved the frequency resource utilance greatly.GPRS mainly provides the bursty data business for the mobile data user, can connect fast, and not have the link setup time delay.In gprs system, the function that whole base station sub-system BSS (Base Station Subsystem) system mainly finishes, send the wireless mouthful of synthetic packet data package one by one of data chunk to SGSN exactly, the packet data package that SGSN is sended over resolves into and can send to corresponding cellphone subscriber wireless mouthful of data block that sends simultaneously.For realizing this function, need in the BSS of gsm system, add packet control unit, just the PCU unit.
The major function of the packet control unit PCU of GPRS has: adjust the real-time frame number between PCU and the BTS; In descending process, will unpack into the Radio Link controll block RLC (Radio Link Control) that mobile phone can receive from Packet Data Unit PDU (the Packet Data Unit) frame of the logical link control layer LLC (Logical Link Control) of SGSN; In up process, will reassemble into LLC layer PDU frame from the RLC radio block of mobile phone and give SGSN; Transmission and reception to wireless port service piece on the packet traffic channel are dispatched; Carry out foundation, release, hang-up, recovery and the resource changing of up-downgoing TBF (Temporary Block Flow); The affirmation pattern of transmitting RLC data and affirmation mode not; The flow of the down link of control Base Station Subsystem GPRS Protocol treatments B SSGP (Base Station Subsystem GPRS Protocol) etc.
Therefore, on gsm system, realize gprs service, need to increase the PCU unit.And the PCU unit need have one to understand accurately for wave point time division multiple access frame number (hereinafter referred frame number) timing information again if finish management to Radio Resource, particularly needs the positioning control downlink data block.Frame number generally directly is uploaded to the PCU unit by BTS, and radio block number is calculated according to frame number and multi-frame structure thereof again in the PCU unit.Radio block number is exactly that 4 continuous time division multiple access frames are formed the radio block with numbering, Serial Number Range is 0 to 11, these 12 radio blocks add other 4 time division multiple access frames that other purposes arranged totally 52 time division multiple access frames constitute cycle of a radio block, the numbering that is radio block is that loop cycle is gone down with 12, and concrete structure as shown in Figure 3.But owing to the not equal reason of up-downgoing time-delay, descending radio block number can't be calculated by the frame number that wave point is uploaded, (52 time division multiple access frames constitute the cycle of a radio block with multiple frame number but system requires the radio block number of PCU unit and BTS again, with these 52 frames is a numbering unit number consecutively, Serial Number Range is 0 to 63, multiple frame number is exactly this numbering, it is a loop cycle with 64, concrete structure is as shown in Figure 3) fully synchronously, therefore descending radio block number and multiple frame number all need keep synchronous with BTS in the mode of real-time adjustment.
As can be seen, the method for synchronization of rationally choosing between PCU unit and the BTS is extremely important for the Interface design between PCU unit and the BTS.At present general way is directly upwards to transmit the frame number of wave point, calculates radio block number according to the GPRS multi-frame structure again.But, because transmitting frame number to the PCU unit, BTS needs the time, uplink time delay is promptly arranged, so PCU is descending to the bad location of frame number,, in descending, deduct the influence of this time delay then even the uplink time delay of system is known in the PCU unit, but because downlink transfer also has time delay, when the propagation delay time of up-downgoing was different, this way will cause descending frame number inaccurate, thereby influenced the location of PCU unit to radio block number.The system that makes can't guarantee that the descending radio block number of PCU unit and BTS is synchronous fully with multiple frame number, causes the instability of systematic function.
Certainly, also can add equipment in addition and transmit radio frame number specially, but do like this, not only increase cost, and, increased the destabilizing factor of system simultaneously owing to introduce new equipment to PCU.
Summary of the invention
The descending radio block that the objective of the invention is to propose a kind of PCU of assurance unit and BTS is number synchronous with multiple frame number, enhanced system stability, can effectively avoid simultaneously increasing regularly synchronous method in the GPRS of cost again, overcoming the systematic function instability that can't realize in the prior art that PCU unit and the descending radio block of BTS number and multiple frame number cause fully synchronously, and the cost that causes of interpolation equipment increases in addition and unstable Deng's shortcoming of system.
Core concept of the present invention is: adopt the negative feedback of closed loop to adjust mode, and real-time monitoring, real time execution, the timing of PCU and BTS is synchronous in the adjustment gprs system.This adjustment with the piece of the piece of PCU unit number and ETS number be the piece number of wave point whether consistent be standard, if consistent, then be considered as adjusting and finish, be i.e. B
Dif=0.
The present invention proposes method regularly synchronous in a kind of GPRS, comprises the steps:
(1) to produce the radio block of oneself when system start-up number be B in the PCU unit
Pcu(scope is 0 to 11), and send BTS to by descending PCU frame;
(2) the PCU unit calculates next time radio block number (own radio block number being carried out the add-one operation of mould 12), gets time use ready;
(3) judge whether BTS has received the PCU frame; If receive, then carry out step (4), otherwise, carry out step (7);
(4) after BTS received described descending PCU frame, the radio block number that solves wherein was B
Pcu
(5) calculate the current radio block B of BTS according to the structure of the frame number of wave point and GPRS multi-frame radio block number
Bts
(6) BTS calculates B according to formula (a)
PcuWith B
BtsThe difference B of two pieces number
Dif
B
dif＝(B
pcu-B
bts+12)/12 (a)
(7) judge whether the difference that this calculates to PCU unit forwarding step (6),, then carry out step (8) if can not send out, otherwise, carry out step (9)
(8) handle other task, get back to step (3) then;
(9) (6) step was calculated gained difference B
DifIn up PCU frame, send to the PCU unit; PCU calculates current piece B according to formula (b) after receiving the unit difference
PCU, B
PcuThe time PCU original piece number, and send BTS to by descending PCU frame, get back to step (2) then;
B
PCU＝(B
pcu-B
dif+12)/12 (b)
The present invention adjusts mode by the negative feedback that adopts closed loop, the propagation delay time of monitoring in real time, real time execution and Adjustment System.Can effectively guarantee system's stable operation rapidly, and can adjust synchronously in real time.This mode can make full use of the benefit of in-band signalling on the one hand, obtains as early as possible synchronously also to keep synchronously; On the other hand can be after synchronously again under the situation because of certain reason step-out, can detect this situation at once, obtain fast once more synchronously and keep synchronously.Thereby effectively guaranteed system synchronously, improved the stability of a system, and owing to do not increase hardware, to the cost of system without any influence.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is the method for the invention flow chart;
Fig. 2 is that this clearly demarcated described negative feedback piece is adjusted schematic diagram;
Fig. 3 is a GPRS multi-frame radio block structure of the present invention;
Fig. 4 is the radio block number adjustment example schematic between PCU unit and the BTS.
Embodiment
Fig. 1 is the flow chart of the method for the invention.Need to prove because the cycle of PCU frame be 20 milliseconds, if so in this method each step have pair frame to receive and the judgement that sends, criterion generally can be thought: whether last transmission of distance or reception go over 20 milliseconds, if to 20 milliseconds, then are judged as true, otherwise, be judged as vacation.At first system powers on and brings into operation, the PCU unit produces a radio block number (by the gsm protocol requirement between 0 to 11), and in descending PCU frame (PCU frame be the improvement of trau frame-Transcoder and Rate Adaptation Unit to code conversion among the GSM and Rate Adapter Unit frame), send BTS to, the PCU unit number adds 1 with the radio block of oneself then, after carrying out the computing of mould 12, preserve this result, prepare next time and use.After BTS receives whole PCU frame, from the PCU frame, solve the radio block number of PCU cell side, simultaneously BTS calculates the radio block number of current BTS side according to the absolute frame number of multi-frame structure and current time division multiple access thereof, as shown in Figure 3, it is frame number that each time division multiple access frame has a numbering, 4 time division multiple access frames are formed the radio block with numbering, and 52 time division multiple access frames are formed 12 radio blocks of a piece number from 0 to 11, and radio block number is that loop cycle is gone down with 12.And then calculate the difference of two pieces number according to formula (a), and with this difference attached in the up PCU frame, judge whether to send up PCU frame again to the PCU unit.If the BTS side is not received full effective PCU frame, then flow process is directly gone to and is judged whether to transmit the PCU frame, if not, then handle other task, send the PCU frame to the PCU unit if will then start, after PCU receives the unit, therefrom propose BTS, calculate the current radio block that should issue in PCU unit number according to formula (b) again attached to wherein difference, and radio block number added 1, after carrying out mould 12, preserve this result, prepare next time and use.Whether BTS is descending receives whether a full PCU frame and BTS are up will transmit a PCU frame, is that the length by the PCU frame determines that the typical length of PCU frame is 320 bits, and the duration is 20 milliseconds.
If because other reasons such as external interference, after obtaining synchronously, B
DifBe not 0 again, that will be obtained synchronously once more just again through once above-mentioned adjustment process.Certainly, notice that the time interval of adjusting between double must be greater than the propagation delay time of circuit, because after must waiting until that last adjustment target has realized, just can carry out adjustment next time, that is to say that each adjustment all will carry out successively, after confirming that this adjustment is finished, just can carry out next time and adjust, can not be overlapping.Confirm that once adjusting the method for having finished is after BTS provides a difference, then, the PCU unit is only carried out once and is adjusted, up to having received new difference again, represent that just this adjustment finishes, then, calculate the PCU unit and receive that the time difference between new difference and the previous difference is exactly a chain circuit transmission time delay, the time interval between per twice adjustment in PCU unit is greater than this propagation delay time.
Fig. 2 is that mode is adjusted in the negative feedback between PCU radio block of the present invention number and the BTS piece number.Degenerative adjustment mode is that the signal of several inputs is done a comparison, draws a deviation, goes to adjust some input with this deviation again, so that deviation reduces, and is 0 as early as possible, to reach system balancing fast.Two input signals describing among this figure are pieces of producing of PCU unit number and the piece of BTS side number, both are compared, according to formula (a) calculated difference, promptly deduct the latter and obtain a deviation with the former, this deviation is done again the processing of mould 12, guarantee that the result is a positive number, feeds back to the PCU unit with this deviation then.After PCU receives deviation in the unit,, promptly on the basis of its current piece number, deduct this deviate, and, guarantee that the result is a positive number, thereby obtain new piece number value the processing that the result does mould 12 according to formula (b).And this piece number value is synchronous with BTS.With this degenerative adjustment mode, can guarantee system stability, fast, effectively operation.
Fig. 3 has described 52 multi-frame structures of GPRS, and the paging cycle of 64 52 multi-frames.From the scope of scheming radio block as can be seen number is 0 to 11, and paging cycle is 64 52 multi-frames, and this all is the gsm protocol regulation.Because the position of wireless data block in paging cycle need be known in the PCU unit, so wanting synchronously except radio block number between PCU and the BTS, multiple frame number is also wanted synchronously, therefore, just there are piece number and multiple two adjustment of frame number, these two adjustment are separate, and all fours, and the present invention number is adjusted into the example explanation with piece.According to this figure, BTS can calculate absolute frame number by time division multiple access and calculate radio block number, and this radio block number is exactly when calculating the PCU piece number with BTS piece difference in the formula (a), the BTS piece that use number; BTS also can be calculated the multiple frame number (gsm protocol is defined as 0 to 63) of paging by the absolute frame number of time division multiple access, to realize the adjustment with the same paging multi-frame of radio block adjustment mode.This shows that this figure is that piece number is adjusted the foundation of adjusting with the paging multi-frame, promptly through after adjusting, the radio block number that requires the PCU cell side and paging be frame number in full accord with this figure again.
In Fig. 4, the present invention number is adjusted into example with a concrete radio block, describes the process of adjusting.Among Fig. 4 (a): if the radio block of PCU unit number equals 4, then: B
Pcu=4; B
Bts=2; Calculate the deviation B of two radio blocks number according to formula (1)
Dif, B then
Dif=2.When this deviation B is received in the PCU unit
DifAfter, calculate current radio block B according to formula (2)
PCU: B
PCU=3.Thereby learn that the current piece in PCU unit number is exactly adjusted number, value is 3.From Fig. 4 (b) as can be seen, before adjusting, should be the position of B5 originally, now because adjust and become B3, and this moment BTS radio block number also be B3.As seen, receive that having radio block number is B as BTS
PCUThe PCU frame time, the radio block of BTS number also is B
PCU, i.e. adjustment amount B
DifBe 0.So far, the adjustment of the radio block of PCU and BTS number is achieved success, and PCU and BTS have obtained synchronously.
It is simple to facts have proved that this adjustment scheme realizes, reliable, antijamming capability is strong, can obtain fast synchronously also to keep synchronously, for realizing that gprs service provides solid guarantee.
Claims (5)
1, time synchronization method in a kind of GPRS comprises the steps:
(1) the PCU unit produces the radio block B of oneself when system start-up
Pcu, and send BTS to by descending PCU frame;
(2) the PCU unit calculates radio block number next time, gets ready time to use;
(3) judge whether BTS has received the PCU frame; If receive, then carry out step (4), otherwise, execution in step (7);
(4) after BTS receives described descending PCU frame, parse radio block B wherein
Pcu
(5) Structure Calculation according to the frame number of wave point and GPRS multi-frame radio block number goes out the current radio block B of BTS
Bts
(6) BTS calculates B according to formula (a)
PcuWith B
BtsThe difference B of two pieces number
Dif
B
dif＝(B
pcu-B
bts+12)/12 (a)
(7) judge whether the difference that this calculates to PCU unit forwarding step (6),, then carry out step (8) if can not send out, otherwise, carry out step (9)
(8) handle other task, get back to step (3) then;
(9) (6) step was calculated gained difference B
DifIn up PCU frame, send to the PCU unit; PCU calculates current piece B according to formula (b) after receiving the unit difference
PCU, B
PcuBe the original piece of PCU number, and send BTS to, get back to step (2) then by descending PCU frame;
B
PCU＝(B
pcu-B
dif+12)/12 (b)。
2, time synchronization method in the GPRS as claimed in claim 1, it is characterized in that, if each step has pair frame to receive and the judgement that sends, its criterion is: whether last transmission of distance or reception go over 20 milliseconds, if 20 milliseconds in the past, then be judged as "Yes", otherwise, be judged as "No".
3, time synchronization method in the GPRS as claimed in claim 1 is characterized in that, the radio block B described in the step (1)
PcuScope is between 0 to 11.
4, time synchronization method in the GPRS as claimed in claim 1 is characterized in that, the mode that the PCU unit described in the step (2) calculates radio block next time number is: the add-one operation that current radio block number is carried out mould 12.
5, time synchronization method in the GPRS as claimed in claim 1 is characterized in that, institute constitutes in steps once and adjusts, the propagation delay time of adjusting between double interval greater than circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011426683A CN100426876C (en) | 2001-12-11 | 2001-12-11 | Timed synchronizing method in general block radio business |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011426683A CN100426876C (en) | 2001-12-11 | 2001-12-11 | Timed synchronizing method in general block radio business |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1426246A true CN1426246A (en) | 2003-06-25 |
| CN100426876C CN100426876C (en) | 2008-10-15 |
Family
ID=4676898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011426683A Expired - Fee Related CN100426876C (en) | 2001-12-11 | 2001-12-11 | Timed synchronizing method in general block radio business |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100426876C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100433852C (en) * | 2005-10-13 | 2008-11-12 | 中兴通讯股份有限公司 | Adaptive packet data transmission method for EGDE system |
| WO2010148972A1 (en) * | 2009-12-31 | 2010-12-29 | 中兴通讯股份有限公司 | Method and system which is applicable to time domain reduced transmission time interval (rtti) for synchronizing general packet control unit (pcu) frame number |
| WO2011015070A1 (en) * | 2009-08-03 | 2011-02-10 | 中兴通讯股份有限公司 | Processing method for packet control unit frame, transmission method and system thereof |
| CN1838585B (en) * | 2005-03-23 | 2011-05-04 | 华为技术有限公司 | Method for obtaining same block number data frame in multi chain circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI110351B (en) * | 1997-11-11 | 2002-12-31 | Nokia Corp | A method for synchronizing time slots for radio signal transmission, and a method for a radio telephone network, a base station subsystem, and a mobile station |
| CN1142665C (en) * | 2000-01-03 | 2004-03-17 | 华为技术有限公司 | Method for synchronizing channel coding blocks |
-
2001
- 2001-12-11 CN CNB011426683A patent/CN100426876C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1838585B (en) * | 2005-03-23 | 2011-05-04 | 华为技术有限公司 | Method for obtaining same block number data frame in multi chain circuit |
| CN100433852C (en) * | 2005-10-13 | 2008-11-12 | 中兴通讯股份有限公司 | Adaptive packet data transmission method for EGDE system |
| WO2011015070A1 (en) * | 2009-08-03 | 2011-02-10 | 中兴通讯股份有限公司 | Processing method for packet control unit frame, transmission method and system thereof |
| CN101990314B (en) * | 2009-08-03 | 2013-12-11 | 中兴通讯股份有限公司 | Packet control unit frame processing method, transmission method and system |
| WO2010148972A1 (en) * | 2009-12-31 | 2010-12-29 | 中兴通讯股份有限公司 | Method and system which is applicable to time domain reduced transmission time interval (rtti) for synchronizing general packet control unit (pcu) frame number |
| CN102118190A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | General PCU frame number synchronizing method and system suitable for time domain reduced transmission time interval |
| CN102118190B (en) * | 2009-12-31 | 2014-02-05 | 中兴通讯股份有限公司 | General PCU frame number synchronizing method and system suitable for time domain reduced transmission time interval |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100426876C (en) | 2008-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101076989B (en) | De-jitter buffer adjustments based on estimated delay | |
| CN101483909B (en) | Reverse power control method based on multi-carrier | |
| RU2374774C2 (en) | Method and device for control of voice services speed in mobile communication system that supports voice services via packet network | |
| US9025509B2 (en) | Mobile wireless communication system, access gateway, wireless base station, and mobile wireless communication control method | |
| CN101304557B (en) | Packet transmission control method and apparatus | |
| JP4219930B2 (en) | Transmission parameter control device | |
| CN1870600B (en) | Method and apparatus for carrying packetized voice and data in wireless communication networks | |
| JP2003516090A (en) | Method and system for applying bit rate to utilize service area | |
| KR20060125779A (en) | Fast signalling procedure for streaming services quality of service managing in wireless networks | |
| CN100546277C (en) | In wireless network by signaling to optimize the method and the communication system of rate controlled scheme | |
| KR102371921B1 (en) | Apparatu and method for updating time sensitive communications assistance information in a mobkle system | |
| CN100486249C (en) | Method for adjusting transmission control protocol receive window | |
| CN101425914B (en) | Multimedia multicast service synchronization regulation method and reinforced base station | |
| CN100426876C (en) | Timed synchronizing method in general block radio business | |
| JP2002510895A (en) | Delay control method | |
| WO2005109673A1 (en) | Power control method and apparatus with inter-link interference prediction for use in cdma wireless communication networks | |
| CN101369842B (en) | Method for regulating sending window of wireless link control layer service in affirmation mode | |
| CN1921406B (en) | Computing method for connecting frame number displacement of activation time in empty-orifice synchronous configuration signal | |
| CN1879320A (en) | Frame synchronisation in a radio access network | |
| WO2005032009A1 (en) | Method for dynamically allocating power of a pilot channel | |
| CN106162875B (en) | Communication means, device and equipment | |
| CN101990241B (en) | Packet data transmission system and method | |
| CN109587728B (en) | Congestion detection method and device | |
| CN102571588B (en) | Method, system and equipment for transmitting transcode rate adapt unit (TRAU) frame in packet network | |
| JP2002368685A5 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHENG CITY ZTE CO., LTD. Free format text: FORMER OWNER: SHENZHENG CITY ZTE CO., LTD. SHANGHAI SECOND INSTITUTE Effective date: 20030724 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20030724 Applicant after: Zhongxing Communication Co., Ltd., Shenzhen City Applicant before: Shanghai Inst. of No.2, Zhongxing Communication Co., Ltd., Shenzhen City |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20081015 Termination date: 20171211 |