CN1169087A - System and method for transferring from first carrier frequency to second carrier frequency - Google Patents
System and method for transferring from first carrier frequency to second carrier frequency Download PDFInfo
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- CN1169087A CN1169087A CN 97109909 CN97109909A CN1169087A CN 1169087 A CN1169087 A CN 1169087A CN 97109909 CN97109909 CN 97109909 CN 97109909 A CN97109909 A CN 97109909A CN 1169087 A CN1169087 A CN 1169087A
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- carrier frequency
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- time slot
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J4/00—Combined time-division and frequency-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/16—Analogue secrecy systems; Analogue subscription systems
- H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The digital communication system has a base station with several transmitters, each transmitting on a different carrier frequency. All transmitters maintain a time synchronisation at one frame plane, and the base station can transfer information signals from a first to second carrier frequency of the transmitters. A remote receiver which is far from the base station detects the transition from the first to the second carrier frequency through the base station and obtains data on the second carrier frequency by using a process including receiving changing instruction of carrier wave, tuning to the second carrier frequency, obtaining the second carrier frequency excursion, data reception and keeping on using of time base synchronisation at the first obtained carrier frequency.
Description
The present invention relates generally to communication system, the communication system that relates in particular to from time to time, moves from first carrier frequency to second carrier frequency.
Comprising one or more base stations, and wherein each base station comprises one or more wireless sets and comprises in definite communication system of the one or more remote subscriber units that have a wireless set respectively, wishes sometimes an ongoing communication is moved on to another carrier frequency from a carrier frequency.Past, for finishing this requirement, the receiver of the wireless set of subscriber unit except that be tuned to must carry out at least two operations the new carrier frequency.At first, the frequency shift (FS) of new carrier wave must be caught or estimate again to receiver again.Be in the system of diverse location at transmitter and receiver, this is common requirement, so that their reference oscillators are separately avoided mutual locking at first.This condition (non-locking oscillator) will cause centre frequency some skews to occur from the centre frequency of its requirement at receiver.Usually use automatic frequency control (AFC) to eliminate this frequency shift (FS).In essence, this frequency shift (FS) will be caught or estimate to the AFC loop, be also referred to as frequence estimation, and eliminate this frequency shift (FS) from received signal.
Second operation that usually requires receiver to finish in many communication systems is that bid is synchronous again, and base is synchronous again when being also referred to as, that is, at base station transmitter from a carrier wave to synchronous with new carrier signal again second carrier transformation.Be in the system in a plurality of places at transmitter, for example, cellular telephone system, transmitter is general mutual asynchronous, must catch again when therefore each new transmitter starts and finish identical information transmission synchronously, for example receiver moves with respect to transmitters different in the system.Yet, according to catch again in frequency shift (FS) with the time basic weight new Synchronous Processing during the data fact that can not accurately be received, after the carrier frequency conversion again the capture frequency skew and again during synchrodyne the base required time can produce losing of the information that is transmitted.
Expectation provides a kind of improved method, be used for carrier transformation after can be soon again bid synchronously and frequency computation part, to reduce carrier transformation loss of data afterwards.
The characteristics that the present invention is considered to have novelty are set forth in appended claims especially.With reference to following description, and corresponding accompanying drawing, structure of the present invention and mode of operation, and purpose and advantage will more apparent, similar reference number is represented similar elements in the accompanying drawing, wherein:
Fig. 1 is the block diagram of the element of an addressing communication system of expression;
Fig. 2 is expression receiver capture frequency skew and the schematic diagram operated with the time synchronized of new carrier wave in a conventional manner;
The similar Fig. 2 of Fig. 3 is the schematic diagram of expression receiver response operation that carrier transformation carried out according to the present invention;
Fig. 4 is the schematic diagram of the successive frame that transmits during carrier transformation according to the present invention of expression;
Fig. 5 is a function diagram with transmitter of at least two channels, and wherein the time slot in frame and two channel frames is asynchronous; With
Fig. 6 similarly schemes with Fig. 5, wherein frame and slot synchronization.
Although the present invention can have other application, for convenience of description for the purpose of, put up with on the cable tv network and to realize that connection mode service (for example, phone, visual telephone or data, services) carries out reference.
The present invention relates generally to have the enforcement of the addressing communication system of time division multiplexing, for example, on the cable tv network, provide the communication system of connection mode service (that is phone).Especially, the present invention relates in such communication system after carrier transformation can very fast bid again synchronously and the novel system and the correlation technique of frequency offset estimation.
Addressing system can be thought a such system, and wherein each user does not obviously move relative to their base station or transmitter, that is, opposite with mobile phone or cellular telephone system.The system that uses the cable tv network to carry out telephone service is such addressing system.As shown in Figure 1, in such system, in the base station 8, cable switch (CEX) 10 uses each all to be positioned at a plurality of transmitters of cableport wireless set (CPX) 14, and for example transmitter 13 arrives a plurality of users with telephone signal through a plurality of channel distribution by cable control unit (CCU) 12 operation-interfaces.These signals be by may using optical fiber or coaxial cable, or the two cable system that all uses 15 delivers to a plurality of users, and each user has the suitable cable connection unit (CAU) 16 that connects subscriber equipment.Each subscriber unit CAU16 comprises the wireless set 18 that is used for through cable system 15 communications.Each wireless set 18 comprises receiver 20.Such system can utilize time division multiplexing, this means that a plurality of subscriber units share an independent carrier frequency by it is cut apart in time.
In the base station of this system, provide at least two and usually be a plurality of transmitters, each transmitter is operated in different carrier frequency.When delivering a letter breath on the frequency in these carrier frequency, usually provide the method that information conversion is not had loss of data to another carrier frequency in base-station.For example, when disturbing or other factors when making us to be reduced in the quality of information that given carrier frequency transmits, use the method that transforms to another carrier frequency with accepting.At cable system, burst noise usually appears at the transmitter of base station, is also referred to as cable tv head end or cable control unit (CCU).This burst noise can make given channel or frequency reduce to unacceptable level suddenly.Like this, for seeking the carrier frequency that not influenced by burst noise, the base station will change transmitter, therefore, and by being called the processing recovery channel quality that carrier transformation or reserve link transmit.Like this, as following described with reference to figure 2, the processing of carrier transformation or reserve link conversion generally requires subscriber unit or cable connection unit (CAU) to catch the synchronous of new carrier wave and carrier shift estimation again.
With reference to figure 2, described receiver 20 and caught the frequency shift (FS) of new carrier wave and the operating sequence that time synchronized is carried out.As mentioned above, at least two transmitters in different carrier frequency work are used in the base station.Like this, when disturbing or other factors when making us being reduced in the information quality that transmits on the frequency in these carrier frequency, the base station can be transmitted information and be forwarded second or new carrier frequency to with accepting.The processing that changes carrier frequency is also referred to as reserve link conversion or carrier link conversion sometimes.Therefore, at Fig. 2, at first reception carrier link transformation directive is shown in step 22 for receiver 20, and expression moves to new carrier frequency with communication.Then, receiver 20 with its synthesizer be tuned to second carrier wave, shown in the step 24.Then, catch the frequency shift (FS) of new carrier wave in step 26.After finishing these steps, catch the time synchronized of new carrier wave in step 28, and after finishing all operations formerly, can finally receive data in step 30.Execution in step 24 is during to the whole operation of step 28, and receiver 20 can not receive data.
Can be synchronously in a system in many different stage definition.In general, if information is transmitted at the synchronization with very little variation, think that so these two signals are synchronous.Being defined as synchronously of higher level requires two signals to be in the same point that has very little variation in the information flow.Bit-level synchronization requires signal to transmit information simultaneously from given bit.Generally, require 0.25 bit time in the transition of signal at another signal.Timeslot-level (for example, a frame is a plurality of time slots in time division multiple access [TDMA] system) requires same time slot (for example, tdma system 8 time slots one group) the transmission information of signal in the frame synchronously, generally has bigger transition change.The frame level requires signal to transmit information from the same frame in the framing (superframe) synchronously, generally has a bigger transition change.If a signal is required in a lot of levels synchronously, data must be from the same point that is positioned at all rank so, and two signals must be wanted transition in the seeking time in their minimum.
In addressing system, for example, the cable tv system, we have realized that whole carrier frequency that might require the base station keep some or all other time synchronized of level.When carrying out when synchronous, we also recognize the receiver (or CAU) of subscriber unit during carrier transformation (or ALT), can use by the base station keep from the time synchronized level of formerly catching initial or first carrier.During Synchronous Processing again, reuse the time synchronized level of formerly catching and to allow to omit some or all these steps, therefore reduce the synchronous required time of second carrier wave.
According to the present invention, by a plurality of transmitters to the base station, being also referred to as cable control unit (CCU) 12 carefully provides signal to obtain synchronously simultaneously.Require at the signal of bit transition on the time and the indicating device of current bit value for bit-level synchronization.Synchronous for increasing timeslot-level and frame level, need represent the counter of current time slots or frame number respectively.As mentioned above, depart from the variation of synchronous less but receivable variation from these signal delays of one group of transmitter 13 among the CPX14 that arrives CCU12.
Therefore, with reference to figure 3, as can be seen, when operating, during carrier transformation, can omit the required step of time synchronized of catching new carrier wave according to the present invention.Like this, at Fig. 3, receiver 32 is initial to operate with the receiver 20 similar modes of Fig. 1, at this, receiver 32 is at step 24 reception carrier link transformation directive, step 26 with synthesizer be tuned to second carrier wave and catch the frequency shift (FS) of new carrier wave in step 28.Should be realized that initial two steps (24,26) that to finish these operations with the variety of way of knowing.Can the capture frequency skew by other known methods.Useful method is to be " improved automatic frequency correction is caught " (procuratorial case ancestor no.PD05506AM) at exercise question, applying date 1995.12.18, and sequence number 08/574,538 has been incorporated this paper described method of not examination of appeal as a reference into.Yet after these steps, because needn't catch time synchronized on the new carrier wave, the receiver of operation prepares to receive data now according to the present invention, shown in step 30.
With reference to figure 4, with the time saving that an example explanation is operated to realize according to said method, this case representation wherein information is included in two successive frames that transmit in the time slot 2 (effectively RX time slot) of every frame.When operating according to the present invention, the last frame that wherein sends carrier transformation information has conversion message in time slot 2, with the information that is transmitted together.Like this, carry out the step of the reception carrier link transformation directive of step 24 expression among Fig. 2 at this.In beginning during next frame, CCU carry out carrier transformation and receiver or CAV can with its synthesizer be tuned to second carrier wave, shown in the step 26 among Fig. 2.According to the present invention, by utilizing, the described method of not unexamined patent for example above-mentioned application in an independent time slot in the execution graph 2 the new carrier shift of step 28 catch (that is, AFC catches).In described embodiment, this AFC catches and occurs in the just time slot before effective RX time slot, or the time slot in the example shown in Figure 41.Like this, receiver prepares to receive the data immediately following after the time slot 1 of next frame.Therefore, when operating according to the present invention, can obliterated data during the carrier link conversion process.
Because the frame level of the whole carrier waves that send and receive by CCU regularly is synchronous, is possible so the AFC in the CAU catches the timing in cycle.And,, receive function and receive the interior data of next continuous time slot, as shown in Figure 4 for constituting CAU so that at an independent time slot IT frequency offset estimation (AFC catches).Therefore, when operating according to the present invention, only data will be lost during the information in requiring receiving slot 0, like this time slot before AFC catches not.Yet, even in this case, only lose the information of an individual frames, and AFC catches and will occur in the time slot 7 (Fig. 4 is not shown) of first frame that transmits on the new carrier frequency.
In described embodiment, communication system adopts eight time slot time division multiple access/time division multiplexing/Frequency Division Duplexing (FDD) multiplexing (TDMA/TDM/FDD) frame structure, wherein by the cable control unit a plurality of carrier waves is injected the cable tv head end and is used for reception by the cable connection unit that is positioned at user side.Should be realized that in the situation that does not break away from the scope of the invention and can adopt different frames and structure of time slot.As mentioned above, in the solution of the present invention and system, by use and the initial identical time synchronized of capturing carrier, capture time is synchronous again for receiver or CAU when the carrier link conversion takes place, but continues to use the synchronous of initial capturing carrier.The time chien shih AFC that may save by omitting this step catch occur in immediately following eight in instantaneous seven before the valid data time slot in the frame after carrier transformation instantaneous in, do not cause loss of data like this.The 8th instantaneous, have only the data in the independent time slot to be lost.
With reference to figure 5, as mentioned above, according to the present invention, between a plurality of carrier waves that use in CCU, with bit, time slot and frame level keep synchronously at CCU.According to some existed system, Fig. 5 represents a CCU or a transmitter 40 with two nonsynchronous channels 42 and 44.
On the contrary, according to the present invention, Fig. 6 represents a transmitter or CCU50, and whole channels of wherein represented channel 1 and 2 (52,54) are at bit, and time slot and frame level are synchronous.Begin to have less relatively time migration 55 at frame as can be seen, shown in arrow among the figure and dotted line in the beginning of the frame of channel 2 with respect to channel 1.Yet regularly compare with the bit-level of system, this side-play amount is less relatively.Like this, the channel 1 and 2 among Fig. 6 is at bit, and time slot and frame level are synchronous.
Although represented in detail and described specific embodiment of the present invention, do not leaving under the situation of the present invention aspect wider, at different aspect of the present invention, those skilled in the art can make and changing and modification, this is conspicuous, in variation and the modification some are about general structure and design, and other also are conspicuous through thinking afterwards.Therefore, scope of the present invention is not limited to specific embodiment described herein and ad hoc structure and limits by the appended claims book and the equivalent form of value thereof.Therefore, the purpose of appended claims book is to cover all these variations and modification, and it is within the real spirit and scope of the present invention.
Claims (10)
1 one kinds of digital communication systems that can transform to second carrier frequency from first carrier frequency, wherein information is time division multiplexing and sends with series of frames, every frame has the information that a plurality of time slots and each time slot hold predetermined number of bits, described information is sent out at least one time slot, described system comprises: the base station with a plurality of transmitters, each transmitter sends at different carrier frequency, described whole transmitter is synchronous in the frame level retention time, and described base station can transform to second carrier frequency from first carrier frequency with information; With a receiver unit with described base station apart from each other, described receiver unit can be by the conversion of described base station detection from described first carrier frequency to described second carrier frequency, and can handle by one and catch data at described second carrier frequency, this processing comprises step: the reception carrier transformation directive, be tuned to described second carrier frequency, catch the frequency shift (FS) of described second carrier frequency, and the reception data, and do not continue under the synchronous situation to use from second carrier frequency is caught time base from first carrier frequency formerly catch the time base synchronously.
2 systems according to claim 1, wherein receiver unit receives the frequency shift (FS) that described carrier transformation instructs and catches second carrier frequency at the next frame of described frame at a frame, and when information when time slot except that first time slot of every frame transmits, catch the frequency shift (FS) of second carrier frequency in the time slot in described next frame of receiver before the time slot of the information of transmission.
3 one kinds in the receiver of communication system from the method for the first carrier frequency to second carrier frequency conversion, wherein information is time division multiplexing and is sent out with series of frames, every frame has a plurality of time slots, and each time slot holds the information of predetermined number of bits, described information distribution is at least one time slot, and system also comprises a base station with a plurality of transmitters, each transmitter sends at different carrier frequency, described base station can transform to described second carrier frequency from described first carrier frequency with information, wherein whole described transmitters are synchronous in the frame level retention time, and described method comprises step: the reception carrier transformation directive; Be tuned to second carrier frequency; Catch the frequency shift (FS) of described second carrier frequency; And the reception data, and not from second carrier frequency is caught time base under the synchronous situation, continue to use from first carrier frequency formerly catch the time base synchronously.
4 methods according to claim 3, wherein the step of reception carrier transformation directive occurs in the frame, and the step of wherein catching the frequency shift (FS) of second carrier frequency occurs in immediately following the next frame at a described frame, and, when information transmitted in the time slot except that first time slot of described next frame, the step of catching the frequency shift (FS) of second carrier frequency occurred in the time slot of described next frame before the time slot of transmission information.
5 one kinds of receivers that are used for to transform to from first carrier frequency digital communication system of second carrier frequency, wherein information is time division multiplexing and sends with one group of series of frames, every frame has the information that a plurality of time slots and each time slot hold predetermined number of bits, and described information is sent out at least one time slot, and comprise a base station with a plurality of transmitters, each transmitter sends at different carrier frequency.Whole described transmitters are synchronous in the frame level retention time, described base station can transform to second carrier frequency from first carrier frequency with information, described receiver comprises: the receiver unit with described base station apart from each other, described receiver unit detects from the carrier transformation of first carrier frequency to second carrier frequency by described base station and instructs, and handle by one and to catch data at described second carrier frequency, this processing comprises step: be tuned to described second carrier frequency, catch the frequency shift (FS) of described second carrier frequency, and reception data, and not from second carrier frequency is caught time base under the synchronous situation, continue to use from first carrier frequency formerly catch the time base synchronously.
6 receivers according to claim 5, wherein receiver receives described carrier transformation instruction and is closelying follow the frequency shift (FS) of catching second carrier frequency at the next frame of described frame in a frame, and, when information when the time slot except that first time slot of every frame transmits, receiver before the time slot of the information of transmission in the frequency shift (FS) of a time slot IT second carrier frequency of described next frame.
7 one kinds of digital communication systems that can transform to second carrier frequency from first carrier frequency, wherein information is time division multiplexing and sends with series of frames, every frame has the information that a plurality of time slots and each time slot hold predetermined number of bits, and described information is sent out at least one time slot, described system comprises: the base station with a plurality of transmitters, each transmitter is operated in different carrier frequency, whole described transmitters are at bit, time slot and frame level retention time are synchronous, and described base station can transform to second carrier frequency from first carrier frequency with information; With a receiver unit with described base-station apart from each other, described receiver unit can detect the conversion from described first carrier frequency to described second carrier frequency and handle the data catch second carrier frequency by one by described base station, and this processing comprises step: the reception carrier transformation directive.Be tuned to described carrier frequency, catch the frequency shift (FS) of described second carrier frequency, and receive data, and not when second carrier frequency is caught under the synchronous situation of base, continue first carrier frequency that priority of use catches the time base synchronously.
8 one receivers that are used for to transform to from first carrier frequency digital communication system of second carrier frequency, wherein information is time division multiplexing and sends with series of frames, every frame has the information that a plurality of time slots and each time slot hold predetermined number of bits, and described information sends at least one time slot, described system comprises a base station with a plurality of transmitters, each transmitter is operated in different carrier frequency, whole described transmitters are at bit, time slot and frame level retention time are synchronous, described base station can transform to second carrier frequency from first carrier frequency with information, described receiver comprises: the receiver unit with described base station apart from each other, described receiver unit detects from the carrier transformation of first carrier frequency to second carrier frequency by described base-station and instructs, and handle by one and to catch data at described second carrier frequency, this processing comprises step: be tuned to described second carrier frequency, obtain the frequency shift (FS) of described second carrier frequency, and reception data, and not from the second carrier frequency rate is caught time base under the synchronous situation, continue first carrier frequency that priority of use catches the time base synchronously.
9 one kinds of digital communication systems that can transform to second carrier frequency from first carrier frequency, wherein information is time division multiplexing and sends with series of frames, every frame has the information that a plurality of time slots and each time slot hold predetermined number of bits, and described information sends at least one time slot, described system comprises: the base station with a plurality of transmitters, each transmitter is operated in different carrier frequency, whole described transmitters are synchronous in the timeslot-level retention time, and described base station can transform to second carrier frequency from first carrier frequency with information; With a receiver unit with described base station apart from each other, described receiver unit can detect conversion from first carrier frequency to second carrier frequency by described base station, and can handle by one and catch data at described second carrier frequency.This processing comprises step; The reception carrier transformation directive, be tuned to described second carrier frequency, catch the frequency shift (FS) of described second carrier frequency, and receive data, and not when second carrier frequency is caught under the synchronous situation of base, continue first carrier frequency that priority of use catches the time base synchronously.
10 1 kinds of digital communication systems that can transform to second carrier frequency from first carrier frequency, wherein information is time division multiplexing and sends with series of frames, every frame has the information that a plurality of time slots and each time slot hold predetermined number of bits, and described information is sent out at least one time slot, described system comprises: the base station with a plurality of transmitters, each transmitter sends at different carrier frequency, whole described transmitters are synchronous in the bit-level retention time, and described base station can transform to second carrier frequency from first carrier frequency with information; With a receiver unit with described base station apart from each other, described receiver unit can detect conversion from described first carrier frequency to described second carrier frequency by described base station, and can handle by one and catch data at described second carrier frequency, this processing comprises step: the reception carrier transformation directive, be tuned to described second carrier frequency, catch the frequency shift (FS) of described second carrier frequency, and reception data, and not from second carrier frequency is caught time base under the synchronous situation, continue first carrier frequency that priority of use catches the time base synchronously.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US60293696A | 1996-02-16 | 1996-02-16 | |
| US602,936 | 1996-02-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1169087A true CN1169087A (en) | 1997-12-31 |
Family
ID=24413367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97109909 Pending CN1169087A (en) | 1996-02-16 | 1997-02-14 | System and method for transferring from first carrier frequency to second carrier frequency |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN1169087A (en) |
| AU (1) | AU1264897A (en) |
| DE (1) | DE19706085A1 (en) |
| ID (1) | ID16200A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1705251B (en) * | 2004-05-31 | 2010-05-05 | 京瓷株式会社 | Base station device and base station control method |
| CN111818574A (en) * | 2020-05-22 | 2020-10-23 | 福建北峰通信科技股份有限公司 | Carrier self-adaptive balanced seamless switching method and mobile communication terminal |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114828046B (en) * | 2022-04-13 | 2025-02-21 | Oppo广东移动通信有限公司 | Method for determining operation information, operation device, terminal equipment and storage medium |
-
1997
- 1997-02-12 AU AU12648/97A patent/AU1264897A/en not_active Abandoned
- 1997-02-14 CN CN 97109909 patent/CN1169087A/en active Pending
- 1997-02-17 ID IDP970446A patent/ID16200A/en unknown
- 1997-02-17 DE DE1997106085 patent/DE19706085A1/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1705251B (en) * | 2004-05-31 | 2010-05-05 | 京瓷株式会社 | Base station device and base station control method |
| CN111818574A (en) * | 2020-05-22 | 2020-10-23 | 福建北峰通信科技股份有限公司 | Carrier self-adaptive balanced seamless switching method and mobile communication terminal |
| CN111818574B (en) * | 2020-05-22 | 2023-03-24 | 福建北峰通信科技股份有限公司 | Carrier self-adaptive balanced seamless switching method and mobile communication terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| ID16200A (en) | 1997-09-11 |
| DE19706085A1 (en) | 1997-08-21 |
| AU1264897A (en) | 1997-08-21 |
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