CN2687964Y - CDMA terminal hard-switching time parameter correction - Google Patents
CDMA terminal hard-switching time parameter correction Download PDFInfo
- Publication number
- CN2687964Y CN2687964Y CNU032649371U CN03264937U CN2687964Y CN 2687964 Y CN2687964 Y CN 2687964Y CN U032649371 U CNU032649371 U CN U032649371U CN 03264937 U CN03264937 U CN 03264937U CN 2687964 Y CN2687964 Y CN 2687964Y
- Authority
- CN
- China
- Prior art keywords
- time parameter
- terminal
- time
- base station
- mobile radio
- 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.)
- Expired - Fee Related
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The utility model discloses a time parameter correction after a CDMA (Code Division Multiple Access)terminal is hard switched, which relates to the time parameter correction of a mobile station terminal after hard switching. A searcher hardware provides a control holding and the measuring of signal intensity for a mcontroller which is used for controlling the entire system which comprises a data demodulator and a modulator. The mobile station (terminal) is provided with the master timer of 18 bits, which stores the arrival time of earliest available multiple signals at the accuracy of 1/8 data block time and adjusts 8 times in each data time. The time parameter correction is done at the mode of the mcontroller writing the master timer. When the service base station delivers the indication information of an expansion switching to the mobile station (terminal), the hard switching is triggered; when hard switching, the mobile station (terminal) does the time parameter correction before a new base station sequentially communicates with the mobile station. The advantage of the utility model is that the time parameter correction is done before the new base station sequentially communicates with the mobile station when hard switching, so the disconnecting rate caused by the hard switching is reduced.
Description
Technical field:
The utility model relates to the time parameter of a kind of mobile radio station terminal behind direct-cut operation to be proofreaied and correct, and is mainly used in the cdma mobile station terminal.
Background technology:
In CDMA1 and CDMA2000 standard, each base station all can ceaselessly send the direct sequence signal of non-data-modulated in control channel.Sort signal is made up of data block stream (CHIP), and each data block maximum length is PN (puppet is made an uproar) sequence (cycle of every sequence is 215).Control channel is discerned at interval with the length of comparing 64 data blocks with 0 skew control (PN) sequence, except the reference phase that coherent demodulation is provided, control signal also can make mobile radio station (terminal) obtain and keep the sequential of forward data link, and carries out the strong and weak differentiation of base station signal to switch in good time.
In the CDMA standard of mentioning in front, soft/direct-cut operation all is to provide the moment of network service to finish in mobile radio station (terminal) and service.In soft handover, mobile radio station (terminal) has just begun when not interrupting with old base station communication and the communicating by letter of new base station.Soft handover can only use under adjacent C DMA frequency range has the situation of identical frequency assignments, and it has the otherness of forward traffic channel and backward current amount channel at the base station boundary.Direct-cut operation usually occurs in the following moment: disjoint base station service area, different Frequency Distribution, different frequency range types, different frame deviations etc.In direct-cut operation, the communication meeting is temporarily interrupted, and this is because mobile radio station (terminal) must interrupt in beginning and new base station communication and the communicating by letter of old base station.
Summary of the invention:
Purpose of design: CDMA standard-required: mobile radio station (terminal) is set up a kind of time parameter, and this this parameter is used to produce the timing and the system timing of data block, signal, frame groove.Under stable situation, mobile radio station (terminal) time parameter absolute value should be less than 1 microsecond (moment that is used to demodulation with the measured multiple signals the earliest of mobile radio station (terminal) antenna be a benchmark), be moved the signal the earliest that the base station utilizes if another multiple signals become, then the time parameter of mobile radio station (terminal) will be followed the trail of this new signal.When receiving the forward traffic data, mobile radio station (terminal) time parameter should be as the transmitting time of reverse flow data.If mobile radio station (terminal) time parameter need be proofreaied and correct, all having in any 100 milliseconds cycle should be faster than 1/8 data block (generation) time.
Design: after a direct-cut operation, usually the time parameter of mobile radio station (terminal) and the earliest arrival time of multi-path signal have bigger discrepancy, every 100MS only is not more than 1/8 data block (generation) time and is used for the way that time parameter proofreaies and correct and will causes long mobile radio station (terminal) time parameter misalignment time, goes offline thereby cause.A segment that temporarily can't receive forward traffic is arranged in the middle of direct-cut operation, proofread and correct thereby carry out time parameter before above-mentioned CDMA standard allows mobile radio station (terminal) and newly base continues to communicate by letter.Therefore, the technical solution of the utility model makes exactly when carrying out direct-cut operation, continues to communicate by letter with new base station and carries out this time parameter correction before, thereby make drop rate that direct-cut operation causes descend.Its technical scheme: the correction of cdma mobile terminal time parameter behind direct-cut operation, searcher hardware is supported and signal strength measurement for Mcontroller provides control, Mcontroller is used to control whole system, comprise data demodulator and modulator, mobile radio station (station eventually) has one 18 register (Master Timer), with available the earliest multiple signals time of advent of the precision of 1/8 data block time storage and proofread and correct 8 times in each data time, it is that mode so that Mcontroller writes Master Timer is carried out that time parameter is proofreaied and correct.
The utility model is compared with background technology, because when carrying out direct-cut operation, and has carried out the time parameter correction before continuing communicate by letter in new base station, so has made drop rate that direct-cut operation causes descend greatly.Solved that people want to solve and the technical barrier that do not have to solve has been obtained beyond thought technique effect, economic benefit and social benefit.
Description of drawings:
Fig. 1 is the module diagram of mobile base station receiver.
Embodiment:
Fig. 1 is the module map of mobile radio station (terminal) receiver.A block diagram of fhe mobilestation receiver is shown in Figure 1.searcher hardware is supported and signal strength measurement for Mcontroller provides control.Mcontroller is used to control whole system, comprises data demodulator and modulator.For the maintenance system time, mobile radio station (station eventually) has one 18 register, is called Master Timer, and it is with the available the earliest multiple signals time of advent of precision storage of 1/8 data block time.This register is a continual correcting register, proofreaies and correct in each data time 8 times, and it is that mode so that Mcontroller writes Master Timer is carried out that time parameter is proofreaied and correct.
Current Serving BTS sends an expansion indication message, will trigger direct-cut operation during to mobile radio station (terminal).This information has comprised the channel of new serving BS, the PN skew, and vertical shift, mobile radio station (terminal) stops the demodulation relevant with old base station, transmission work, radio frequency is adjusted to new channel, after adjusting the time, enough radio frequencies begin search at the frequency range window ((window width is a network parameter)) that is the center with new base station PN skew, search can be returned the strongest multiple signals PN skew of 4 new base stations, in the multiple signals path that these return, the multiple signals that arrive the earliest and its intensity and maximum multichannel intensity differ less than 3 decibels are available the earliest multiple signals path (Of these, the earliest arriving multipath that is within 3 db ofthe maximum multipath strength is deemed as the earliest arriving " usable " multipath.), carrying out time parameter this moment proofreaies and correct, the PN phase place is write MasterTimer, mobile radio station (terminal) is so use the vertical shift of appointment, the transmission of the new base station of beginning demodulation utilizes new time parameter and new base station to transmit.
Claims (3)
1, the correction of time parameter behind a kind of CDMA terminal direct-cut operation, it is characterized in that: searcher hardware is supported and signal strength measurement for Mcontroller provides control, Mcontroller is used to control whole system, comprise data demodulator and modulator, mobile radio station (station eventually) has one 18 register (Master Timer), with available the earliest multiple signals time of advent of the precision of 1/8 data block time storage and proofread and correct 8 times in each data time, it is that mode so that Mcontroller writes Master Timer is carried out that time parameter is proofreaied and correct.
2, the correction of time parameter behind the CDMA terminal direct-cut operation according to claim 1, it is characterized in that: when Current Serving BTS sends an expansion indication message to mobile radio station (terminal), will trigger direct-cut operation, during direct-cut operation, mobile radio station (terminal) is communicated by letter with the continuation of new base station and is carried out the time parameter correction before.
3, the correction of time parameter behind the CDMA terminal direct-cut operation according to claim 1, it is characterized in that: handover information comprises the channel of new serving BS, the PN skew, and vertical shift, mobile radio station (terminal) stops the demodulation relevant with old base station, transmission work, radio frequency is adjusted to new channel, after adjusting the time, enough radio frequencies begin search at the frequency range window that is the center with new base station PN skew, search can be returned the strongest multiple signals PN skew of 4 new base stations, in the multiple signals path that these return, the multiple signals that arrive the earliest and its intensity and maximum multichannel intensity differ less than 3 decibels are available the earliest multiple signals paths, carrying out time parameter this moment proofreaies and correct, the PN phase place is write MasterTimer, mobile radio station (terminal) is so use the vertical shift of appointment, the transmission of the new base station of beginning demodulation utilizes new time parameter and new base station to transmit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032649371U CN2687964Y (en) | 2003-06-25 | 2003-06-25 | CDMA terminal hard-switching time parameter correction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU032649371U CN2687964Y (en) | 2003-06-25 | 2003-06-25 | CDMA terminal hard-switching time parameter correction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2687964Y true CN2687964Y (en) | 2005-03-23 |
Family
ID=34661156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU032649371U Expired - Fee Related CN2687964Y (en) | 2003-06-25 | 2003-06-25 | CDMA terminal hard-switching time parameter correction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2687964Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113452464A (en) * | 2020-03-24 | 2021-09-28 | 中移(成都)信息通信科技有限公司 | Time calibration method, device, equipment and medium |
-
2003
- 2003-06-25 CN CNU032649371U patent/CN2687964Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113452464A (en) * | 2020-03-24 | 2021-09-28 | 中移(成都)信息通信科技有限公司 | Time calibration method, device, equipment and medium |
| CN113452464B (en) * | 2020-03-24 | 2022-11-15 | 中移(成都)信息通信科技有限公司 | Time calibration method, device, equipment and medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6526039B1 (en) | Method and system for facilitating timing of base stations in an asynchronous CDMA mobile communications system | |
| CN1201509C (en) | Sync method between mobile comm system and base station | |
| JP3926287B2 (en) | Soft handover method for multicast multimedia broadcasting service in code division multiple access mobile communication system | |
| US6009091A (en) | Method and apparatus for mobile station location within a communication system | |
| EP2312768B1 (en) | Communications in an asynchronous wireless network | |
| CN1192531C (en) | Synchronous realizing method of broad band CDMA system | |
| US7047011B1 (en) | Synchronization in diversity handover | |
| CA2737848A1 (en) | Method and apparatus for providing wireless communication system synchronization | |
| EP0987848A2 (en) | Time synchronization of packetized radio signals to base stations | |
| CN101184325B (en) | Switch method and terminal in communication system | |
| CN100415054C (en) | Method for confirming multi-path location by soft handoff in base station | |
| CN2687964Y (en) | CDMA terminal hard-switching time parameter correction | |
| CN101128018A (en) | Switching method and terminal in long evolved system | |
| CN100518031C (en) | Correction method of time parameter after CDMA terminal hard switched | |
| CN100558005C (en) | Adjust the method for downlink data frame delivery time in a kind of transport channel synchronization process | |
| CN100373795C (en) | Multi-path tracing method for WCDMA upstream special link-circuit | |
| CN102300277B (en) | Different frequency hard handover method and equipment | |
| CN100401838C (en) | Switch synchronization method for asynchronous CDMA system | |
| CN101217741A (en) | A single-baseband single radio frequency dual-card dual-standby communication terminal and the corresponding synchronization method | |
| CN100407862C (en) | Method for realizing intercell soft switching in OFDM system | |
| CN100486388C (en) | A method for improving air signal transmission quality of CDMA system | |
| CN100396157C (en) | Method for building transmission link in softer handover | |
| CN100438695C (en) | Method and device for detecting transmission time delay difference between soft exchange activating pole every base state | |
| NZ587789A (en) | Updating timing of user equipment by determining timing drifts relative to a set of cells | |
| CN101198144B (en) | Soft handoff method in WCDMA mobile communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050323 |