CN1960214A - Method for realizing synchronization in PHS system - Google Patents
Method for realizing synchronization in PHS system Download PDFInfo
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- CN1960214A CN1960214A CN 200610159731 CN200610159731A CN1960214A CN 1960214 A CN1960214 A CN 1960214A CN 200610159731 CN200610159731 CN 200610159731 CN 200610159731 A CN200610159731 A CN 200610159731A CN 1960214 A CN1960214 A CN 1960214A
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Abstract
The PHS system consists of the base station and the terminal. Comm. between the base station and the terminal uses the up-going and the down-going channels, which are counted by frames. These channels include respectively the control slot and the comm. slot. These slots include respectively the unique character for obtaining symbol synchronization. The special point is that both control slot and comm. slot adopt the 32 bits unique character. Further, when combines each two frames for channel coding, the odd frame and the even frame adopt different unique character. Furthermore, the odd frame and the even frame of synchronization impulses also adopt different unique character. Thus, the symbol synchronization, the frame synchronization and the system synchronization are realized.
Description
Technical field
The present invention relates to wireless communication technology, relating in particular to is a kind ofly having the synchronous method of realization in the PHS of chnnel coding (Personal Handyphone System, the personal hand-held phone) system.
Background technology
Generally, the PHS air interface adopts the working method of TDD (Time Division Duplex, time division duplex), and the physical channel is divided into down going channel (base station is to terminal) and data feedback channel (terminal to base station).According to the definition of the air interface STD-28 of PHS system standard, the PHS air interface adopts the access mode of TDMA (Time Division Multiple Access, time division multiple access), and the physical channel of air interface is unit with the frame, and the length of a frame is 5ms.Fig. 1 is the structure chart of expression PHS air interface frame.As shown in Figure 1, the frame of 5ms comprises 8 time slots (each time slot 625us), and wherein, T represents sending time slots, and R represents receiving slot.
The time slot of each PHS frame can be regarded a physical channel as, is divided into two kinds according to employed carrier frequency: that uses the control carrier frequency is called the control time slot, is used for the transmission of signaling; Use the communication time slot that is called of communication carrier frequency, be mainly used in miscellaneous service.1 pair of control time slot must be arranged in the PHS frame, and all the other 3 pairs is communication time slot, and terminal can be distinguished control time slot and communication time slot by the different UW (be unique word, be also referred to as identifier word) that receives.Simultaneously, under the UW situation that the match is successful, control time slot or communication time slot can be obtained sign synchronization.
The control time slot and the communication time slot of PHS system air interface structurally have obvious difference.Fig. 2 (a) and (b) are to represent the control time slot of PHS system air interface and the structure chart of communication time slot respectively.The function of each part of time slot is as shown in table 1 below shown in Fig. 2 (a) and (b).
| Abbreviation | Title | Length (bit) | | ||
| R | Reply | ||||
| 4 | The adjacent time-slots buffer space | ||||
| SS | | 2 | The frame synchronization code word is used for synchronously | ||
| | Prefix code | 62 or 6 | Be used for clock synchronization, be " 10 " | ||
| UW | | 32 or 16 | Specific code element | ||
| CAC | Public access channel | 108 | The content of control time slot | ||
| I | Information | The content of communication time slot | |||
| CRC | Cyclic redundancy check (CRC) | 16 | Check bit for the error detection coding generation | ||
| GT | Guard | 16 | Be used to prevent that the adjacent time-slots data are overlapping under the synchronous relatively poor situation |
Table 1
First problem is about sign synchronization, and is as shown in table 1, and two cover UW are arranged in the existing P HS system, and one is 32 bits, is used to control time slot, and one is that 16 bits are used for communication time slot.Yet when adopting adaptive multi-rate (AMR) coding to carry out under the situation of chnnel coding on the communication time slot, because receiving sensitivity improves, the UW of 16 bits is not enough to satisfy the demand.This be because, the UW of the communication channel of PHS system is 16 bits, but it can only allow the UW mistake of a bit, when there is wrong more than the bit in UW, just can not obtain the synchronous of symbol.
Second problem is about frame synchronization, in the past, each voice user of PHS system adopts the channel of 32kbps, yet,, have many new speed to occur far below the speech coding technology of 32kbps along with the development of technology, for example, it is the technology that half-rate channel is supported each voice user that UTStarcom has proposed a kind of 16kbps of employing, and half rate is meant between base station and the mobile phone by the rule of agreement, only 10ms work at interval on specific time slot respectively in advance.Fig. 3 is the structure chart of time slot allocation in this half rate technology of expression.As shown in Figure 3, this technology is to make the Traffic Channel of original 32Kbps resolve into the Traffic Channel of 2 16Kbps.
Yet the great majority coding is to adopt the speech samples of 20ms as a voice module, and the frame length that the PHS system of above-mentioned half rate adopts is 10ms, and this just means that a kind of technology of needs is correctly to make the PHS frame alignment of 20ms frame and 10ms.
Again, the 3rd problem is about system synchronization, when phs terminal is transformed into communication channel from control channel, and need be through a synchronous phase that sends and receive lock-out pulse.Fig. 4 is the structure chart of expression by the lock-out pulse of STD-28 definition.
But if this lock-out pulse is not encoded, it just can't reach the receiving sensitivity identical with control channel or communication channel, also just can't realize system synchronization.
Summary of the invention
The present invention aims to provide and a kind ofly can realize synchronous method better in the PHS system in view of the above problems.
In the PHS system, realize in the synchronous method, described PHS system comprises base station and terminal, adopt between base station and terminal with the frame is that the data feedback channel and the down going channel of unit communicates, in described data feedback channel and down going channel, include control time slot and communication time slot respectively, in described control time slot and described communication time slot, comprise the UW that is used to obtain sign synchronization respectively, it is characterized in that, adopt the UW of 32 bits and adopt the UW of 32 bits at described communication time slot at described control time slot.Thus, can realize the synchronous of symbol.
Best, adopt 4 UW for described control time slot, adopt 4 UW for described communication time slot.
Best, adopt 2 UW for the control time slot of described data feedback channel, and adopt 2 UW for the control time slot of described down going channel.
Best, adopt 2 UW for the communication time slot of described data feedback channel, and adopt 2 UW for the communication time slot of described down going channel.
Best, when per 2 frames are combined under the situation of carrying out chnnel coding, adopt different UW with even frame for odd-numbered frame.Thus, can make the PHS frame alignment of 10ms of the speech frame of chnnel coding of 20ms and half rate, can achieve frame synchronously.
Best, adopt same set of UW for described control time slot and communication time slot.
Best, described UW has low cross correlation and high autocorrelation.
Best, for being used to make terminal to convert the lock-out pulse of communication channel to, also make the odd-numbered frame of this lock-out pulse and even frame adopt different UW from control channel.Thus, can on synchronizing channel, adopt two continuous frames to carry out chnnel coding, and distinguish parity frame, realize system synchronization with the UW word.
Description of drawings
Fig. 1 is the structure chart of expression PHS air interface frame.
Fig. 2 (a) and (b) are the control time slot of expression PHS system air interface and the structure chart of communication time slot.
Fig. 3 is the structure chart of time slot allocation in this half rate technology of expression.
Fig. 4 is the structure chart of expression by the lock-out pulse of STD-28 definition.
Fig. 5 is the structure chart of the communication time slot of expression an embodiment of the present invention.
Fig. 6 is the structure chart of the lock-out pulse of expression an embodiment of the present invention.
Fig. 7 is the block diagram of expression PHS inside of base station structure.
The detailed description that better embodiment is done in conjunction with the drawings, above-mentioned and further feature of the present invention and advantage will become apparent.The detailed description and the accompanying drawings only are illustrative nature to the present invention, are not to be used for limiting its scope, and scope of the present invention is limited by claims and equivalents thereof.
Embodiment
Below, with reference to the description of drawings execution mode of in the PHS system, realizing synchronous method of the present invention.
In the present embodiment, structure for the communication time slot in existing control time slot shown in Fig. 2 (a) and (b) and the communication time slot has been done change: the UW that also adopts 32 bits for communication time slot, promptly, not only in the control time slot, adopt the UW of 32 bits, in communication time slot, also adopt the UW of 32 bits simultaneously.Like this, when when on communication time slot, adopting adaptive multi-rate (AMR) coding, the UW of 32 bits that existing 16 bits are longer will allow the PHS system to exist a mistake more than the bit also can obtain the synchronous of symbol at UW, thus, and to satisfy the increase that AMR introduces the back receiving sensitivity.
In the present embodiment, the UW of communication time slot is expanded under the situation of 32 bits, need do correspondingly to adjust structure of time slot.Fig. 5 is the structure chart of the communication time slot of expression an embodiment of the present invention.For example, can adjust the structure of communication time slot as illustrated in fig. 5.UW is 32 bits in Fig. 5, and wherein, Header is used to the type of coding that indicates channel type and adopted, the speech data of DATA for needing to transmit.
Certainly, the structural adjustment of communication time slot is not limited to execution mode shown in Figure 5, also can does other conversion as required,, promptly can obtain effect same as described above as long as make that the UW of this communication time slot is 32 bits.
Below, the concrete condition of the UW of above-mentioned 32 bits of description configuration.
For a PHS frame, the UW of control time slot keeps 32 bits, but being different from existing STD-28 standard like that only adopts a UW, will introduce 4 UW in the present invention, and wherein, 2 are used for data feedback channel, and 2 are used for down going channel.
For communication time slot, as mentioned above, make UW expand to 32 bits to adapt to the increase that AMR introduces the back receiving sensitivity.Further, be different from existing STD-28 standard and like that only adopt a UW, but similarly need with introducing 4 UW, wherein, 2 UW are used for data feedback channel, 2 UW are used for down going channel.Under the situation of carrying out chnnel coding, UW1 is defined as first time slot of channel coding module, UW2 is remaining time slot.
And, can adopt same set of UW for above-mentioned control time slot and communication time slot.
Further, aspect about frame synchronization, be under unit the situation that channel is encoded with per 2 frames, above behavior example, the frame that is consistent with the content of up UW1 when the content of the UW that receives is a frame, the content of the UW that receives of next frame is necessary for the tail frame that matches with up UW2 content so, and the content of these 2 successive frames is merged together when carrying out channel-decoding, then can access correct transmission information.That is to say, be that unit carries out under the situation of chnnel coding with per 2 frames, and different UW will be adopted respectively to distinguish a frame and tail frame, promptly odd-numbered frame be adopted different UW with even frame.Like this, for the PHS frame of the such half rate of 10ms, the UW content is that the frame of UW1 is to occur once every 20ms, this is just consistent with the PHS frame (speech frame of AMR) of 20ms, therefore, can make the PHS frame of 20ms and the PHS frame of 10ms align, promptly can obtain between the two synchronously.
On the other hand, for above-mentioned UW, two important attributes are: low cross correlation and high autocorrelation.So-called autocorrelation is signal and the later similitude of its self phase shift.UW needs autocorrelation preferably, thus UW sign indicating number that relatively receives accurately at receiving terminal and the UW sign indicating number of self.For example, as UW sign indicating number (here, being example with 4 bits only for the purpose of simplifying the description), receiving terminal can accurately mate at two time locations in the phase shift process (1010-0101-1010-0101) with " 1010 ".And use " 1001 " as the UW sign indicating number, then have only a time location accurately to compare.Cross correlation is exactly the difference size between the UW independently.If the UW sign indicating number has very low cross correlation, it is disconnected that erroneous judgement just can not take place.For example, use " 1001 " and " 1100 " as UW, if " 1100 " phase shift becomes " 1001 ", it is identical with " 1001 " with the monitoring of mistake for receiving terminal.And use " 1001 " and " 1011 " as UW, in any case phase shift mistake can not occur yet.
As the example that one 32 bit UW realizes, one group of sequence that meets these attributes is a pseudorandom PN sequence.Below, listed the example that 4 pseudorandom PN sequences are used for the UW of 32 bits:
Uplink UW1 (up UW1): 01000010010110011111000110111010
Uplink UW2 (up UW2): 01000011001001111101110001010110
Downlink UW1 (descending UW1): 11000010110101000111011111001001
Downlink UW2 (descending UW2): 01000010101110110001111100110100
Moreover, about the system synchronization aspect, as describing in the background technology, when phs terminal when control channel is transformed into communication channel, need be through a synchronous phase that sends and receive lock-out pulse, by sending lock-out pulse, can confirm mutually between terminal and the base station that synchronous preparation finishes, the information that can carry out service communication transmits.Lock-out pulse is the structure on the physical layer, because it uses the communication carrier frequency, therefore belongs to communication time slot, but the lock-out pulse employing but is the structure of control time slot.Lock-out pulse for the system synchronization stage receives and sends, and the UW in the lock-out pulse also needs alternately to change as the UW in above-mentioned communication time slot or the control time slot, promptly adopts 2 different UW for odd-numbered frame with even frame.
In addition, also need the bit architecture of lock-out pulse is changed over the similar structure of control time slot to carry out chnnel coding and interweave on synchronizing channel.The structure chart of in Fig. 6, having represented the lock-out pulse of an embodiment of the present invention.As shown in Figure 6, wherein, with the CI in the lock-out pulse from 4 bit expanded to 8 bits, promptly increased by one times bandwidth, but made that the content of transmission still is 4 bits, can increase the receiving sensitivity of CI like this, to realize system synchronization better.
In addition, the block diagram of in Fig. 7, having represented general PHS inside of base station structure.The PHS inside of base station mainly comprises digital interface unit (DSU), logic control element (LCU), radio frequency unit (TRX), effect unit (PA) and duplexer (AS), carry out the signal transmission between above-mentioned digital interface unit (DSU) and the network equipment interface, above-mentioned duplexer (AS) transfers to antenna with signal, wherein, logic control element (LCU) is mainly finished the function of Digital Signal Processing.In the above-mentioned embodiment, communication time slot has been adopted the UW of 32 bits and defined the work of new structure of time slot and made the work of odd-numbered frame and even frame being adopted different UW, in fact all is to be realized by the above-mentioned logic control element (LCU) in the PHS base station.
More than; with reference to accompanying drawing the specific embodiment of the present invention specific descriptions have been made; yet; those skilled in the art are to be understood that; do not departing under spirit of the present invention and the situation by the protection range that claims limited, those skilled in the art can also do various modifications to situation given in the embodiment.Therefore, should not be counted as limitation of the invention with reference to above-mentioned accompanying drawing to the embodiment description that the present invention did.
Claims (8)
1. in the PHS system, realize synchronous method for one kind, described PHS system comprises base station and terminal, adopt between base station and terminal with the frame is that the data feedback channel and the down going channel of unit communicates, in described data feedback channel and down going channel, include control time slot and communication time slot respectively, in described control time slot and described communication time slot, comprise the unique word that is used to obtain sign synchronization respectively, it is characterized in that
Adopt the unique word of 32 bits and adopt the unique word of 32 bits at described communication time slot at described control time slot.
2. as claimed in claim 1ly in the PHS system, realize synchronous method, it is characterized in that,
Adopt 4 unique words for described control time slot, adopt 4 unique words for described communication time slot.
3. as claimed in claim 2ly in the PHS system, realize synchronous method, it is characterized in that,
Control time slot for described data feedback channel adopts 2 unique words, and adopts 2 unique words for the control time slot of described down going channel.
4. as claimed in claim 2ly in the PHS system, realize synchronous method, it is characterized in that,
Communication time slot for described data feedback channel adopts 2 unique words, and adopts 2 unique words for the communication time slot of described down going channel.
5. as claimed in claim 1ly in the PHS system, realize synchronous method, it is characterized in that,
When per 2 frames are combined under the situation of carrying out chnnel coding, adopt different unique words with even frame for odd-numbered frame.
6. as claimed in claim 2ly in the PHS system, realize synchronous method, it is characterized in that,
Adopt same set of unique word for described control time slot and communication time slot.
7. as claimed in claim 2ly in the PHS system, realize synchronous method, it is characterized in that,
Described unique word has low cross correlation and high autocorrelation.
8. as claimed in claim 1ly in the PHS system, realize synchronous method, it is characterized in that,
For being used to make terminal to convert the lock-out pulse of communication channel to, also adopt the chnnel coding of two continuous frames, so that the odd-numbered frame of this lock-out pulse and even frame adopt different unique words from control channel.
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| CN2006101597316A CN1960214B (en) | 2006-09-28 | 2006-09-28 | Method for realizing synchronization in PHS system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101409598B (en) * | 2007-10-12 | 2011-09-14 | 华为技术有限公司 | Talking method and apparatus |
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| CN1571525A (en) * | 2003-07-17 | 2005-01-26 | 中兴通讯股份有限公司 | A bit synchronization method for personal handheld communication system base station |
| 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 |
| CN100426700C (en) * | 2004-08-10 | 2008-10-15 | 中兴通讯股份有限公司 | Synchronization mode for GPS base station in personal portable telephone system |
| JP2006086760A (en) * | 2004-09-15 | 2006-03-30 | Matsushita Electric Ind Co Ltd | Time division multiplex synchronizing device and synchronizing method in time division multiplex communication |
| WO2006069471A1 (en) * | 2004-12-28 | 2006-07-06 | Zte Corporation | A method and device for implementing multi-base station binding communication in phs |
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| CN101409598B (en) * | 2007-10-12 | 2011-09-14 | 华为技术有限公司 | Talking method and apparatus |
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Granted publication date: 20100616 Termination date: 20110928 |