CN1433171A - Method of obtaining present access subzone main scramble in synchronous windeband CDMA system - Google Patents
Method of obtaining present access subzone main scramble in synchronous windeband CDMA system Download PDFInfo
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Abstract
A method to obtain main instruction code of current entering primary in code division multiple access system of synchronous broadband obtains the main instruction code of current entering primary according to the searched corresponding relationship between main instruction code binary presentation sequence and processed time slot of each frame in led in synchronous channel superframe constituted with above and frames when the User's equipment is one the search of primary entering, of which led in superframe is made of multiframe, processed time slot refers to substitution or deduction time slot and all the even or odd time slot in the superframe and the corresponding relationship refers to mapping reliationship between the position or content of processed time slot and main instruction code of the current primary.
Description
Technical field
The present invention relates to sub-district access technology in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, especially refer to a kind of sub-district of in WCDMA system synchronously, finishing when inserting, utilize institute to introduce the method for the corresponding relation acquisition present access subzone main scramble of processed time slot and main scrambler binary representation sequence in the superframe.
Background of invention
Since the latter stage eighties, people are applied to the digital mobile communication field with code division multiple access (CDMA) technology, because characteristics such as its frequency efficiency height, antijamming capability be strong, therefore become a kind of being full of vitality and the mobile communication standard of application prospect.At present, worldwide focus all focuses on the 3-G (Generation Three mobile communication system), as Future Public Land Mobile Telecommunication System (FPLMTS), that is: the universal mobile telecommunications system (UMTS) in international mobile communication system (IMT-2000) in 2000 of International Telecommunication Association (ITU) or Europe.Adopt CDMA technology in 3-G (Generation Three mobile communication system), also become a kind of common recognition, wherein, wideband CDMA (WCDMA) also receives great concern as one of important aspect of air interface.
In WCDMA radio honeycomb mobile communication system, subscriber equipment (UE) carries out the Cell searching step that is absolutely necessary, the purpose of UE search cell has two kinds: the one, and initial ranging and access when UE enters in the cellular system first power on, have just entered situations such as service area such as start; The 2nd, UE in cellular system, is connected the search of carrying out to other neighbor cells beyond the current area with optimum subdistrict for maintenance.
For first kind of Cell searching situation, the frequency that carries out not high (such as start), and do not relate to business (start can not conversed simultaneously), so from user perspective, not too fastidious to access speed.And for second kind of Cell searching situation, travelling carriage must carry out often, be connected with the base station of signal optimum as early as possible with assurance, otherwise, not only influencing power system capacity, and directly influence quality of service, is obviously perception of user, so in this case, the rate request to Cell searching is quite high.As seen, on the whole, to the requirement of Cell searching speed mainly from second kind of cell searching mode, the i.e. search of in cellular system, other neighbor cells being carried out.
Owing in present WCDMA agreement, reference time is separately all arranged in each sub-district, and does not have the unified time normative reference between the sub-district, be asynchronous between each cell base station NodeB, UE does not have prior information any time when the search neighbor cell.In other words be exactly: UE must will spend considerable time like this at the enterprising line search of all phase places.System is to the requirement in time limit when carrying out second kind of Cell searching in order to satisfy, must make UE in the shortest time, search neighbor cell as early as possible, therefore, WCDMA has introduced complicated synchronizing channel and has inserted step, by increasing the raising that complexity exchanges the search access speed for, thereby overcome intellectual not of the asynchronous time that brings of sub-district.
After introducing synchronizing channel, the realization that the sub-district is inserted mainly comprises following step:
1) UE search primary synchronization channel (P-SCH), it is synchronous to select the strongest signal to set up with the chip synchronization and the time slot of current area.
2) UE search is from synchronizing channel (S-SCH), extracts frame (FRAME) synchronously and the scrambler group number of current area in the order of Secondary Synchronization Code (SSC); This scrambler group is meant system according to the WCDMA agreement, and all 512 main scramblers are divided into some scrambler groups, and each scrambler group comprises a fixing main scrambler.
3) on pilot tone (CPICH) channel, by all main scramblers in the current scrambler group are carried out the several times related operation, rule out the main scrambler number of current area, finish the access overall process.
As seen, the purpose that the sub-district is inserted is exactly: set up chip synchronization, slot synchronization and frame synchronization, and obtain the main scrambler number of current area.From top process as can be seen, in WCDMA, introduce the scheme of synchronizing channel at present,, need adopt two synchronizing channels when inserting, i.e. P-SCH and S-SCH in the sub-district though can improve the speed of neighboring cell search; Just can finish through three calculation step simultaneously, processing procedure is quite loaded down with trivial details, and inserting complexity increases greatly.
In Chinese patent application CN01144637.4, a kind of implementation method of WCDMA system synchronization has been proposed, be that synchronization mechanism is introduced among the WCDMA, make that each sub-district is able to synchronously in the whole network, so, effectively resolution system requires the problem of raising Cell searching speed.Based on this, again in Chinese patent application CN02100269.X, proposed to realize in a kind of synchronous wideband CDMA system the method that the sub-district is inserted, this method is in synchronous WCDMA system, only utilize main or, realize that the sub-district of UE is inserted from a kind of main scrambler that can obtain chip synchronization, slot synchronization, frame synchronization and current area of synchronizing channel.Though processing procedure, channel resource when this method inserts the sub-district take, base station power expends and problems such as hardware cost height improve to some extent, but because wherein the acquisition of main scrambler must be finished by the several times related operation, in some cases even will do 512 correlations computings, just can rule out the main scrambler of current area, so, processing procedure is still more loaded down with trivial details, and operation time is long, and computational complexity is also quite high, and then causes access speed to be difficult to improve.In addition, if the scrambler group of dividing is few more, the main scrambler number in every group is just many more, handles just loaded down with trivial detailsly more accordingly, and complexity is high more, and access speed is slow more.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method that obtains present access subzone main scramble in a kind of synchronous wideband CDMA system, and it can reduce a large amount of loaded down with trivial details calculating processes, reduces complexity, and then improves the sub-district access speed.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
Obtain the method for present access subzone main scramble in a kind of synchronous wideband CDMA system, it is when subscriber equipment (UE) carries out sub-district access search, according to the mapping relations of the processed time slot of every frame in the sync channel superframe that constitutes by an above frame that searches and current area master scrambler number, obtain the main scrambler number of present access subzone.
Described superframe is made of two frames or three frames or four frames.Described processed time slot is the replacement time slot, or is the deduction time slot, or is all the even number time slots in the superframe, or is all the odd number time slots in the superframe.Described mapping relations are meant the mapping relations one by one between the position of processed time slot or content and the current area master scrambler number, these mapping relations are meant that 9 bits that will represent current area master scrambler in advance are divided into three parts from a high position to the low level, and it is corresponding one by one with high-order portion, mid portion and low portion successively that three auxiliary parameters are set simultaneously.
Based on above-mentioned core concept, five kinds of implementations are further proposed, wherein, scheme one further comprises:
A1. when UE carried out sub-district access search, if the code word that searches in the current time slots is initial replacement code word, then this frame was first frame in the superframe;
The code word of the code word of second frame replacement time slot that b1. will search, the code word that the 3rd frame is replaced time slot, the 4th frame replacement time slot is mated one by one with the replacement code word of replacing in the code character respectively, and the corresponding replacement code word sequence number of gained is three auxiliary parameter values;
C1. the binary number of three auxiliary parameter value correspondences is arranged in descending order and obtained a binary sequence, the decimal number of this binary sequence correspondence is the main scrambler number of present access subzone.
This method further comprises: preestablish the replacement timeslot number, and the replacement timeslot number in every frame is identical.Described replacement time slot is any one time slot in the frame; Or be above continuous time slot in the frame; Or be the time slot that has fixed intervals in the frame more than.
This method further comprises:
A11. preestablish by four frames and constitute a superframe, this superframe cycle repetition;
B11. optional 9 Secondary Synchronization Codes from 16 Secondary Synchronization Codes are chosen one of them Secondary Synchronization Code as initial replacement code word; 8 Secondary Synchronization Codes of remainder are constituted the replacement code character;
C11. the Primary Synchronisation Code word of replacing time slot in first frame is replaced with initial replacement code word; The Primary Synchronisation Code word of replacing time slot in second frame replaced with replace that first auxiliary parameter is worth pairing replacement code word in the code character; The Primary Synchronisation Code word of replacing time slot in the 3rd frame replaced with replace that second auxiliary parameter is worth pairing replacement code word in the code character; The Primary Synchronisation Code word of replacing time slot in the 4th frame replaced with replace that the 3rd auxiliary parameter is worth pairing replacement code word in the code character.
Scheme two further comprises:
A2. when UE carries out sub-district access search, if search that code word in the current time slots belongs to is in three auxiliary parameters one the replacement code character of coding usefulness separately, then can determine the position of present frame in superframe, and obtain the value of this auxiliary parameter through the code word coupling;
B2. according to the position of present frame, determine the position relation of other two frame, and will through replacement code word that search obtains with replace code word coupling in the code character, obtain corresponding auxiliary parameter value;
C2. by first, second, third auxiliary parameter order, binary number that its value is corresponding is arranged and is generated a binary sequence, and the decimal number of this binary sequence correspondence is the main scrambler number of present access subzone.
This method further comprises:
A21. preestablish by three frames and constitute a superframe, this superframe cycle repetition;
B21. be provided with two and replace code character, each is replaced code character and comprises an above Secondary Synchronization Code word, and two all Secondary Synchronization Code words of replacing in the code character are all inequality;
C21. with two parameters in three auxiliary parameters with the replacement codeword coding in the same replacement code character, another parameter is replaced replacement codeword coding in code character with another separately;
D21. first auxiliary parameter is worth the replacement code word that pairing replacement code word is a replacement time slot in first frame in the setting replacement code character; Second auxiliary parameter is worth the replacement code word that pairing replacement code word is a replacement time slot in second frame in the replacement code character; The 3rd auxiliary parameter is worth the replacement code word that pairing replacement code word is a replacement time slot in the 3rd frame in the replacement code character.
Wherein, the replacement code word number sum in described two replacement code characters is smaller or equal to 16.
This method further comprises: preestablish the replacement timeslot number, and the replacement timeslot number in every frame is identical.
Scheme three further comprises:
A3. carry out the sub-district when inserting search as UE, if searching that code word in the current time slots belongs to is in three auxiliary parameters one the replacement code character of coding usefulness separately, then this frame is first frame in the superframe;
B3. will mate through replacement code word that search obtains and the code word in the corresponding replacement code character, obtain corresponding auxiliary parameter value;
C3. by first, second, third auxiliary parameter order, binary number that its value is corresponding is arranged and is generated a binary sequence, and the decimal number of this binary sequence correspondence is the main scrambler number of present access subzone.
This method further comprises:
A31. preestablish by two frames and constitute a superframe, this superframe cycle repetition;
B31. be provided with two and replace code character, each is replaced code character and comprises an above Secondary Synchronization Code word, and two all Secondary Synchronization Code words of replacing in the code character are all inequality;
C31. with two parameters in three auxiliary parameters with the replacement codeword coding in the same replacement code character, another parameter is replaced replacement codeword coding in code character with another separately;
D31. setting two is the replacement code word of replacing time slot in superframe first frame with the pairing replacement code word of auxiliary parameter of replacing codeword coding in the difference replacement code character; The remaining pairing replacement code word of another auxiliary parameter is the replacement code word of replacing time slot in second frame.
Replacement code word number sum in described two replacement code characters is smaller or equal to 16.
This method further comprises: preestablish the replacement timeslot number, and the replacement timeslot number in every frame is identical.
Scheme four further comprises:
A4. when UE carries out sub-district access search, have predefined particular time-slot at interval if search between two deduction time slots, then this frame is first frame in the superframe;
B4. the deduction time slot of the every frame of search in three frames that follow closely behind this frame subtracts 1 with the deduction timeslot number of every frame of searching, obtains corresponding three auxiliary parameter values;
C4. by first, second, third auxiliary parameter order, binary number that its value is corresponding is arranged and is generated a binary sequence, and the decimal number of this binary sequence correspondence is the main scrambler number of present access subzone.
This method further comprises: the particular time-slot interval that preestablishes two deduction time slots in first frame.This particular time-slot is at interval smaller or equal to 6.
This method further comprises:
A41. preestablish by four frames and constitute a superframe, this superframe cycle repetition;
B41. two of deductions have particular time-slot time slot at interval in first frame;
C41. in second frame, the 3rd frame and the 4th frame, deduct a time slot respectively; Wherein, the deduction timeslot number of second frame equals the first auxiliary parameter value and adds 1; The deduction timeslot number of the 3rd frame equals the second auxiliary parameter value and adds 1; The deduction timeslot number of the 4th frame equals the 3rd auxiliary parameter value and adds 1.
Scheme five further comprises:
A5. when UE carried out sub-district access search, if the code word that searches in the current time slots is initial replacement code word, then this time slot was first even number time slot in the superframe;
B5. from second even number time slot of superframe, search for the code word in each even number time slot successively, if the code word in the current search time slot is the first replacement code word, then Dui Ying binary numeral is 0; If the code word in the current search time slot is the second replacement code word, then Dui Ying binary numeral is 1;
C5. forming pairing binary number sequence in proper order from front to back by the even number time slot, is 9 bits with this 14 bit sequential decoding; The decimal number of this 9 bit correspondence is the main scrambler number of present access subzone.
Described 14 bits of step c5 are to adopt (14,9) grouping encoding protocol to be decoded as 9 bits.
This method further comprises:
A51. preestablish by two frames and constitute a superframe, this superframe cycle repetition;
B51. 9 bits with current area master scrambler correspondence are encoded to 14 bits;
C51. with 14 bits from a high position to the low level with two frames in 15 even number time slots corresponding one by one from front to back;
D51. from 16 Secondary Synchronization Codes, choose 3 wantonly as first, second and initial replacement code word;
E51. the code word in first even number time slot in two frames is replaced with initial replacement code word; From second even number time slot,, then the code word in this even number time slot is replaced with first and replace code word if the binary bit value of this even number time slot correspondence is 0; If the binary bit value of this even number time slot correspondence is 1, then the code word in this even number time slot is replaced with second and replace code word.
Described 9 bits of step b51 are to adopt (9,14) grouping encoding protocol to be encoded to 14 bits.
By such scheme as can be seen, key of the present invention is: the notion of introducing superframe, and preestablish one-to-one relationship between processed time slot position in current area master scrambler number and the superframe or the content, afterwards, position or contained code word by UE resulting processed time slot in search procedure, according to predefined corresponding relation, the counter main scrambler of releasing current area number.
Therefore, obtain the method for present access subzone main scramble in the synchronous wideband CDMA system provided by the present invention, at first be that binary representation sequence with current area master scrambler number is divided into three parts and corresponding auxiliary parameter is set, afterwards, preestablish introduce each frame in the sync channel superframe to deduct or replace time slot, or to replace the corresponding relation of code word and this auxiliary parameter; When UE carries out after Cell searching obtains the position or this time slot code word of processed time slot, according to auxiliary parameter and replacement or deletion time slot, or the corresponding relation between auxiliary parameter and the replacement code word, further obtain the auxiliary parameter value, thereby extrapolate the main scrambler number of current area.With in the prior art by a large amount of relevant contrast computings, terminal decision obtains main scrambler and number compares, and can avoid the related operation of large amount of complex, reduces the complexity of calculating, and then raising sub-district access speed.
Description of drawings
Fig. 1 is the realization schematic diagram of the inventive method first embodiment;
Fig. 2 is the realization schematic diagram of the inventive method second embodiment;
Fig. 3 is the realization schematic diagram of the inventive method the 3rd embodiment;
Fig. 4 is the realization schematic diagram of the inventive method the 4th embodiment.
Fig. 5 is the realization schematic diagram of the inventive method the 5th embodiment.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
According to the WCDMA agreement, the downstream signal transmission is with the scrambler distinguishing cell, and system has 512 main scramblers, corresponding one of them the main scrambler in each sub-district, and generally all main scramblers are divided into 64 scrambler groups, and each scrambler group contains 8 main scramblers.Comprise primary synchronization channel (P-SCH) in the down channel and from synchronizing channel (S-SCH), constitute by Primary Synchronisation Code (PSC) and Secondary Synchronization Code (SSC) respectively that this master and slave synchronizing channel is launched simultaneously at preceding 256 chips of each time slot (SLOT).Wherein, Primary Synchronisation Code is unique in total system, in order to the original position in the timely crack of sign chip; And Secondary Synchronization Code has 16, according to standard protocol specifies, these 16 Secondary Synchronization Codes according to different order constitute 64 kinds unique from synchronizing channel, with scrambler group number under expression frame start position and this sub-district, these 64 kinds are corresponding one by one with above-mentioned 64 scrambler groups from synchronizing channel.
Five following embodiment are in WCDMA system synchronously, and utilize on a kind of basis of synchronizing channel, obtain current area master scrambler with core concept of the present invention.The concrete principle that these five embodiment obtain chip synchronization, slot synchronization and frame synchronization is such:
1) Primary Synchronisation Code with standard is a benchmark, with the UE current search to synchronous code and standard Primary Synchronisation Code mate, coupling is consistent on which chip of which time slot, then this time slot and this chip are the original position of chip and slot synchronization.
2) UE is when carrying out sub-district access search, still on each time slot, synchronization code word is done search, if search the deduction code word that the code word of certain current time slots is first frame in the predefined superframe or replace code word, then this time slot is the deduction time slot of first frame in the superframe or replaces time slot, UE can obtain frame start position by displacement, obtains superframe and frame synchronization simultaneously.
As for the acquisition of main scrambler specifically as described in the embodiment 1～4.
Embodiment 1:
The specific implementation method that main scrambler obtains in the present embodiment is: the superframe of introducing is made of four frames, is that circulation repeats between the superframe.Selected 9 code words are replaced code word for the candidate, in advance every frame in the superframe certain fixedly time slot be set at the replacement time slot, the PSC on this replacement time slot is replaced with corresponding replacement code word, the replacement timeslot number in every frame is identical; When UE inserts search in the sub-district, will be according to the content of replacing code word and main scrambler that sequence number is determined superframe original position and current area number.Generally, from 16 Secondary Synchronization Codes of WCDMA protocol definition, choose 9 Secondary Synchronization Codes (SSC) code word as an alternative wantonly, afterwards, select one in 9 to be labeled as SSC-M as the superframe beginning flag again, all the other 8 SSC are as replacing the code character element, be labeled as SSC-0 ..., SSC-7.Referring to shown in Figure 1, Primary Synchronisation Code PSC in the corresponding respectively time slot of the elongated side's bar of each white among the figure behind the P-SCH, the corresponding respectively replacement code word of replacing in the time slot of the elongated side's bar of each black, 15 time slots are a frame, first frame adopts SSC-M as the superframe beginning flag.Because system has 512 main scramblers, scrambler number from 0 to 511 is 9 (U8, U7 with binary representation, U6, U5, U4, U3, U2, U1 U0), is divided into three sections from highest order, be respectively (U8, U7, U6), (U5, U4, U3) and (U2, U1, U0), this decimal system of three sections corresponding respectively three auxiliary parameter A, B and C, number range all in [0..7], and map to respectively replace code character SSC-0 to SSC-7.System replaces PSC respectively for the corresponding code word of replacing at the fixedly time slot of second frame to the, four frames in advance, that is: at superframe second frame, according to the value of digital A fixedly the PSC in the time slot replace with and replace replacement code word corresponding in the code character, i.e. SSC-A; In like manner, the value according to B is replaced SSC-B in superframe the 3rd frame; Value according to C in superframe the 4th frame is replaced SSC-C.
So, when UE inserted search in the sub-district, search SSC-M searched for replacement code word SSC-A, SSC-B and the SSC-C of other frame in the superframe again to obtain superframe-synchronized earlier, then, replace code word and the matching result of replacing element in the code character according to this, obtain the decimal system numerical value of A, B, C, afterwards, the decimal value of A, B, C is converted to binary number, and by high low level sequential combination together, mapping to one of 512 main scramblers, this main scrambler is the main scrambler of current area.
The replacement time slot that sets in advance generally is any one time slot in the frame, also can be set to above continuous time slot in the frame; Or a time slot that has fixed intervals more than in the frame, to increase the reliability of judgement.
Describe in detail below by the method for an object lesson present embodiment:
16 SSC that define in the WCDMA agreement select the 16th SSC as superframe beginning flag SSC-M, and select 8 SSC for replacing the code character element arbitrarily, be labeled as respectively SSC-0, SSC-1 ... SSC-7}.The process of replacing code word in advance is like this: if the main scrambler of current area number is 273, then this main scrambler number is shown 100010001 with binary form, then being divided into three sections from a high position to the low level is: 100,010,001, accordingly: A is a binary one 00, be the decimal system 4, the corresponding replacement code word SSC-4 that replaces in the code character of SSC-A; In like manner, B is a Binary Zero 10, and promptly the decimal system 2, the corresponding replacement code word SSC-2 that replaces in the code character of SSC-B; C is a Binary Zero 01, and promptly the decimal system 1, the corresponding replacement code word SSC-1 that replaces in the code character of SSC-C.Setting and replacing time slot is the 8th time slot of every frame, and PSC replaces with superframe beginning flag SSC-M in first frame the 8th time slot; PSC replaces with SSC-4 in second frame the 8th time slot; PSC replaces with SSC-2 in the 3rd frame the 8th time slot; PSC replaces with SSC-1 in the 4th frame the 8th time slot.
When UE carries out sub-district access search, earlier by search to Primary Synchronisation Code, obtain chip, slot synchronization, on each time slot, use then SSC-0, SSC-1 ... SSC-7} and SSC-M mate, when finding and SSC-M when the most identical, just can judge this frame is the superframe original position, then next frame promptly is second frame of superframe, on the 8th time slot of this frame, use SSC-0, SSC-1 ... SSC-7} mates, when discovery and SSC-4 are the most identical, just can judge SSC-A is SSC-4, i.e. A=4; In like manner, on the 8th time slot of the 3rd frame, the 4th frame, use SSC-0, SSC-1 ... SSC-7} mates, can obtain B=2, C=1, binary number case height bit combination with A, B, C obtains 100010001 then, the decimal value of this binary number correspondence is 273, so as can be known, the main scrambler of current area number is 273.
Embodiment 2:
The specific implementation method that main scrambler obtains in the present embodiment is: constitute a superframe by three frames, be that circulation repeats between the superframe, simultaneously all Secondary Synchronization Codes are divided into the different code characters of replacing, in advance every frame in the superframe certain fixedly time slot be set at the replacement time slot, PSC on this replacement time slot is replaced with corresponding replacement code word, and the replacement timeslot number in every frame is identical; When UE inserts search in the sub-district, will be according to the content of replacing code word and main scrambler that sequence number is determined superframe original position and current area number.Referring to shown in Figure 2, Primary Synchronisation Code PSC in the corresponding respectively time slot of the elongated side's bar of each white among the figure behind the P-SCH, the corresponding respectively replacement code word of replacing in the time slot of the elongated side's bar of each black, elongated side's bar that grid is filled is represented this replacement code word for adopting an independent code word of replacing the code character coding, and 15 time slots are a frame.Identical with embodiment 1, the binary number of the main scrambler correspondence of current area is divided into three parts, difference corresponding auxiliary parameter A, B, C, and it is worth all in [0..7] scope.Usually, 16 SSC that define in the WCDMA agreement are divided into two replace code character, note is made SSC1 and SSC2 respectively.A, B, C encode with different code words of replacing in the code character respectively, and numerical value 0 to 7 is corresponding one by one with 0 to 7 Number character SSC1-0～SSC1-7 or the SSC2-0 to SSC2-7 that this is replaced in the code character respectively.Two auxiliary parameters among A, B, the C are encoded by the code word in the same replacement code character, and another auxiliary parameter is encoded by an independent code word of replacing in the code character, make the code word of replacing time slot in first, second and third frame replace with A, B, the pairing code word of C respectively.Because wherein the replacement code character under the replacement code word in replacement code word and other frame of a frame is different, so can be according to the very simple original position of extrapolating superframe of this time slot position.
So, when UE inserts search, mate with two all code words of replacing in the code character at the known fixed time slot position, if search current code word for belonging to the code word that certain replaces code character separately, promptly present frame is which frame of this superframe as can be known, so, two frames of all the other in the superframe directly get final product with another all code words and its coupling of replacing in the code character.After obtaining A, B, C value, just can be as embodiment 1 the main scrambler number of anti-release current area.
Describe in detail below by the method for an object lesson present embodiment:
16 SSC that define in the WCDMA agreement, be labeled as respectively SSC-0, SSC-1 ... SSC-15}.Selected SSC-0, SSC-1 ... SSC-7} is code character 1 as an alternative, be labeled as respectively SSC1-0, SSC1-1 ... SSC1-7}, in fact SSC1-0 is exactly SSC-0, and SSC1-1 is exactly SSC-1, has just changed individual mark; Selected simultaneously SSC-8, SSC-9 ... SSC-15} is code character 2 as an alternative, be labeled as respectively SSC2-0, SSC2-1 ... SSC2-7}, in fact SSC2-0 is exactly SSC-8, and SSC2-1 is exactly SSC-9, has also just changed individual mark.The process of replacing code word in advance is like this: if the main scrambler of current area number is 273, then this main scrambler number is shown 100010001 with binary form, then is divided into three sections and is from a high position to the low level: 100,010,001, and corresponding: A=4, B=2, C=1.A and C encode with the code word of replacing code character 1, promptly are respectively SSC1-4 and SSC1-1, and B encodes with the code word of replacing code character 2, is SSC2-2.The PSC that first frame is replaced in the time slot replaces with the pairing code word SSC1-4 of A, and the PSC that second frame is replaced in the time slot replaces with the pairing code word SSC2-2 of B, simultaneously the PSC in the 3rd frame replacement time slot is replaced with the code word SSC1-1 of C correspondence.
When UE carries out sub-district access search, on each time slot, do coupling with two all code words of replacing code character, because the code word of code character 2 has only B to use, B by coupling code character 2 identifies the superframe position, when finding that promptly the code word of the code word of current time slots and code character 2 is the most identical, just can conclude that present frame is second frame of superframe, current replacement code word is the content of B, so just the original position that can confirm superframe simply according to current frame number and the known replacement timeslot number of B.Then, the same with embodiment 1, obtain A=4, B=2, C=1 by code word coupling, the binary combination of A, B, C is 100010001, corresponding decimal value is 273, and then the main scrambler of current area number is 273 as can be known.The superior part of present embodiment is: reduce the length of superframe, be more conducive to detect, more help increasing the reliability of judgement.
Embodiment 3:
For more reducing superframe length, on the basis of employing and embodiment 2 same principle, can superframe length be set to two frames, circulation repeats between the superframe, equally all Secondary Synchronization Codes are divided into the different code characters of replacing, in advance every frame in the superframe certain fixedly time slot be set at the replacement time slot, the PSC on this replacement time slot is replaced with corresponding replacement code word, the replacement timeslot number in every frame is identical; When UE inserts search in the sub-district, will be according to the content of replacing code word and main scrambler that sequence number is determined superframe original position and current area number.Referring to shown in Figure 3, Primary Synchronisation Code PSC in the corresponding respectively time slot of the elongated side's bar of each white among the figure behind the P-SCH, the corresponding respectively replacement code word of replacing in the time slot of the elongated side's bar of each black, elongated side's bar that grid is filled is represented this replacement code word for adopting an independent code word of replacing the code character coding, and 15 time slots are a frame.Select two to adopt the different pairing replacement code words of parameter that code word is encoded in the code character of replacing, replace the replacement code word of PSC in the time slot simultaneously as first frame, the replacement code word of another parameter correspondence is then replaced the replacement code word of PSC in the time slot as second frame.Because code word of being replaced in first frame is different with the replacement code character under other replaces code word, so can be used as the sign of superframe start frame.Such as: A and C are encoded with the code word of replacing code character 1, and B encodes with the code word of replacing code character 2.The PSC that first frame is replaced in the time slot replaces with the pairing code word of A, B, simultaneously the PSC in second frame replacement time slot is replaced with the code word of C correspondence.Owing to have only B among A, B, the C with replacing code character 2 codings, therefore, if find that the replacement code word in the current time slots is the most identical with the code word of replacing in the code character 2, think that then present frame must be first frame of superframe, otherwise be exactly second frame, so just can confirm the superframe original position very simply.
And, also have many similar schemes to use, as long as can reach the purpose that is easy to recognition and verification.Such as: B and C are encoded with the code word of replacing code character 1, and A encodes with the code word of replacing code character 2, during replacement, first frame is still replaced with the pairing code word of A, B, and second frame is still replaced with the code word of C correspondence, like this, because two code words that first frame is replaced belong to different replacement code characters, can not influence mutually, be easy to the acknowledgement frame original position, and then obtain the main scrambler number of current area.
Among the foregoing description 2 and the embodiment 3, the grouping situation of replacing code character also is a flexibility and changeability, such as: the element number in two code characters is different but two code character element number sums are 16; Perhaps identical but two the code character element number sums of the element number in two code characters are less than 16; Perhaps different and two the code character element number sums of the element number in two code characters are less than 16 or the like.
Embodiment 4:
Main scrambler obtains in the present embodiment specific implementation method and embodiment 1 are similar substantially, and different is: utilize the time slot position of deducting PSC within the superframe to represent the scrambler number of frame, superframe original position and current area.Referring to shown in Figure 4, superframe length is four frames, is that circulation repeats between the superframe.Primary Synchronisation Code PSC in the corresponding respectively time slot of the elongated side's bar of each white among the figure behind the P-SCH, on behalf of the PSC of this time slot, blank space deducted, and 15 time slots are a frame.The same with embodiment 1,2,9 main scramblers of binary representation number are divided into three sections from highest order, its decimal system is corresponding auxiliary parameter A, B and C respectively, and the value of this three number is all in [0..7] scope.In first frame of superframe, deduct the PSC of two time slots in advance, as the beginning flag of superframe, these two time slots have fixing slot time; At the PSC of second frame of superframe deduction (A+1) individual time slot, the PSC of the 3rd frame deduction (B+1) individual time slot, the PSC of the 4th frame deduction (C+1) individual time slot.
So, when UE carries out sub-district access search, because have only the time slot of deducting in superframe first frame to have specific, different with other frame slot times, UE just can obtain the starting point of superframe in view of the above, and then promptly be second frame, the 3rd frame, the 4th frame thereafter, according to search second and third, the position of deduction time slot in four frames, the value of A, B, C as can be known, and then obtain the main scrambler number of current area.
Give an example, if the main scrambler of current area number is 273, then as embodiment 1,2, corresponding A=4, B=2, C=1.Deduct the 1st, the 6th time slot in superframe first frame in advance; The 5th time slot in second frame; The 3rd time slot in the 3rd frame; The 2nd time slot in the 4th frame.
UE carries out the sub-district and inserts when searching for, because having only the slot time of deducting in superframe first frame is 4, if equal 4 at interval so search between two deduction time slots, so, this frame is superframe first frame, subsequently be second, third, the 4th frame, the deduction timeslot number that searches second frame is that 5, the three frames deduction timeslot number is that 3, the four frames deduction timeslot number is 2, A=4 as can be known then, B=2, C=1, corresponding binary combination is 100010001, its decimal value is 273, adopts main scrambler No. 273 so obtain current area.
In the present embodiment, two intervals of deducting between the time slot need only smaller or equal to 6 time slots, can guarantee that UE accurately finds the original position of superframe.Certainly, for different deduction slot times, the deduction time slot of first frame also has corresponding variation in the superframe.
Embodiment 5:
The specific implementation method that main scrambler obtains in the present embodiment is: with two frames is a superframe, is that circulation repeats between the superframe.In each superframe, only keep the Primary Synchronisation Code of odd number time slot on the primary synchronization channel, and on remaining 15 even number time slot, encode load carrying frame and main scrambling code information.Referring to shown in Figure 5, optional 3 Secondary Synchronization Code words are at the even number timeslot number, Primary Synchronisation Code PSC in the corresponding odd number time slot of the elongated side's bar difference of each white among the figure behind the P-SCH, replace code words for 2 kinds in the corresponding even number time slot of the elongated side's bar difference of each black, elongated side's bar that grid is filled illustrates that the replacement code word in this time slot is the replacement code word of expression superframe beginning flag, and 15 time slots are a frame.Such as: adopt SSC-0 as 0 coding in the binary system, SSC-1 is as 1 coding in the binary system, and SSC-2 is as the superframe beginning flag.In advance the PSC in first even number time slot of superframe is replaced with SSC-2, pass through the block encoding of (9,14) simultaneously, 9 bits { U8, U7, U6 with main scrambler correspondence, U5, U4, U3, U2, U1, U0} are encoded to 14 bit { U13, U12, U11, U10, U9, U8, U7, U6, U5, U4, U3, U2, U1, U0}, then, from a high position, since an even number time slot of second even number time slot, if this binary value is 0, then the PSC of corresponding time slot replaces with SSC-0 in each corresponding successively superframe; If 1, then the PSC of corresponding time slot replaces with SSC-1.
So, when UE carried out sub-district access search, if the code word that searches in the current even number time slot is SSC-2, then UE can determine the superframe original position in view of the above; Afterwards, obtain 0,1 corresponding sequence, use (9,14) decoding again, obtain 9 binary number, be converted to the main scrambler number that decimal value is current area according to the SSC-0 or the SSC-1 code word of residue even number time slot.
Certainly, (9,14) coding that present embodiment adopts is a kind of of numerous encoding schemes, also can adopt other similar encoding scheme.In addition, recited above serves as the scheme of replacing time slot with the even number time slot, also can be to serve as to replace time slot with the odd number time slot, or serves as to replace time slot with other time slot with equal effect.
In a word, above the various cell accessing methods that proposed, compare with sub-district access procedure in the existing WCDMA system, can simplify loaded down with trivial details related operation process greatly, reduce complexity, and then improve the sub-district access speed; Simultaneously, also can reduce base station down synchronizing channel number, reduce and insert the complexity of handling, and then save the power of base station, reduce to disturb, reduce the UE cost.
The above only is several preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.
Claims (25)
1, obtains the method for present access subzone main scramble in a kind of synchronous wideband CDMA system, it is characterized in that: when subscriber equipment (UE) carries out sub-district access search, according to the mapping relations of the processed time slot of every frame in the sync channel superframe that constitutes by an above frame that searches and current area master scrambler number, obtain the main scrambler number of present access subzone.
2, method according to claim 1 is characterized in that: described superframe is made of two frames or three frames or four frames.
3, method according to claim 1 is characterized in that: described processed time slot is the replacement time slot, or is the deduction time slot, or is all the even number time slots in the superframe, or is all the odd number time slots in the superframe.
4, method according to claim 1 is characterized in that: described mapping relations are meant the mapping relations one by one between the position of processed time slot or content and the current area master scrambler number.
5, method according to claim 4, it is characterized in that: described mapping relations are meant that 9 bits that will represent current area master scrambler in advance are divided into three parts from a high position to the low level, and it is corresponding one by one with high-order portion, mid portion and low portion successively that three auxiliary parameters are set simultaneously.
6,, it is characterized in that this method further comprises according to claim 1,2,3 or 5 described methods:
A1. when UE carried out sub-district access search, if the code word that searches in the current time slots is initial replacement code word, then this frame was first frame in the superframe;
The code word of the code word of second frame replacement time slot that b1. will search, the code word that the 3rd frame is replaced time slot, the 4th frame replacement time slot is mated one by one with the replacement code word of replacing in the code character respectively, and the corresponding replacement code word sequence number of gained is three auxiliary parameter values;
C1. the binary number of three auxiliary parameter value correspondences is arranged in descending order and obtained a binary sequence, the decimal number of this binary sequence correspondence is the main scrambler number of present access subzone.
7, method according to claim 6 is characterized in that this method further comprises: preestablish the replacement timeslot number, and the replacement timeslot number in every frame is identical.
8, method according to claim 6 is characterized in that: described replacement time slot is any one time slot in the frame; Or be above continuous time slot in the frame; Or be the time slot that has fixed intervals in the frame more than.
9, method according to claim 6 is characterized in that this method further comprises:
A11. preestablish by four frames and constitute a superframe, this superframe cycle repetition;
B11. optional 9 Secondary Synchronization Codes from 16 Secondary Synchronization Codes are chosen one of them Secondary Synchronization Code as initial replacement code word; 8 Secondary Synchronization Codes of remainder are constituted the replacement code character;
C11. the Primary Synchronisation Code word of replacing time slot in first frame is replaced with initial replacement code word; The Primary Synchronisation Code word of replacing time slot in second frame replaced with replace that first auxiliary parameter is worth pairing replacement code word in the code character; The Primary Synchronisation Code word of replacing time slot in the 3rd frame replaced with replace that second auxiliary parameter is worth pairing replacement code word in the code character; The Primary Synchronisation Code word of replacing time slot in the 4th frame replaced with replace that the 3rd auxiliary parameter is worth pairing replacement code word in the code character.
10,, it is characterized in that this method further comprises according to claim 1,2,3 or 5 described methods:
A2. when UE carries out sub-district access search, if search that code word in the current time slots belongs to is in three auxiliary parameters one the replacement code character of coding usefulness separately, then can determine the position of present frame in superframe, and obtain the value of this auxiliary parameter through the code word coupling;
B2. according to the position of present frame, determine the position relation of other two frame, and will through replacement code word that search obtains with replace code word coupling in the code character, obtain corresponding auxiliary parameter value;
C2. by first, second, third auxiliary parameter order, binary number that its value is corresponding is arranged and is generated a binary sequence, and the decimal number of this binary sequence correspondence is the main scrambler number of present access subzone.
11, method according to claim 10 is characterized in that this method further comprises:
A21. preestablish by three frames and constitute a superframe, this superframe cycle repetition;
B21. be provided with two and replace code character, each is replaced code character and comprises an above Secondary Synchronization Code word, and two all Secondary Synchronization Code words of replacing in the code character are all inequality;
C21. with two parameters in three auxiliary parameters with the replacement codeword coding in the same replacement code character, another parameter is replaced replacement codeword coding in code character with another separately;
D21. first auxiliary parameter is worth the replacement code word that pairing replacement code word is a replacement time slot in first frame in the setting replacement code character; Second auxiliary parameter is worth the replacement code word that pairing replacement code word is a replacement time slot in second frame in the replacement code character; The 3rd auxiliary parameter is worth the replacement code word that pairing replacement code word is a replacement time slot in the 3rd frame in the replacement code character.
12, method according to claim 11 is characterized in that: the replacement code word number sum in described two replacement code characters is smaller or equal to 16.
13, method according to claim 10 is characterized in that this method further comprises: preestablish the replacement timeslot number, and the replacement timeslot number in every frame is identical.
14,, it is characterized in that this method further comprises according to claim 1,2,3 or 5 described methods:
A3. carry out the sub-district when inserting search as UE, if searching that code word in the current time slots belongs to is in three auxiliary parameters one the replacement code character of coding usefulness separately, then this frame is first frame in the superframe;
B3. will mate through replacement code word that search obtains and the code word in the corresponding replacement code character, obtain corresponding auxiliary parameter value;
C3. by first, second, third auxiliary parameter order, binary number that its value is corresponding is arranged and is generated a binary sequence, and the decimal number of this binary sequence correspondence is the main scrambler number of present access subzone.
15, method according to claim 14 is characterized in that this method further comprises:
A31. preestablish by two frames and constitute a superframe, this superframe cycle repetition;
B31. be provided with two and replace code character, each is replaced code character and comprises an above Secondary Synchronization Code word, and two all Secondary Synchronization Code words of replacing in the code character are all inequality;
C31. with two parameters in three auxiliary parameters with the replacement codeword coding in the same replacement code character, another parameter is replaced replacement codeword coding in code character with another separately;
D31. setting two is the replacement code word of replacing time slot in superframe first frame with the pairing replacement code word of auxiliary parameter of replacing codeword coding in the difference replacement code character; The remaining pairing replacement code word of another auxiliary parameter is the replacement code word of replacing time slot in second frame.
16, method according to claim 15 is characterized in that: the replacement code word number sum in described two replacement code characters is smaller or equal to 16.
17, method according to claim 14 is characterized in that this method further comprises: preestablish the replacement timeslot number, and the replacement timeslot number in every frame is identical.
18,, it is characterized in that this method further comprises according to claim 1,2,3 or 5 described methods:
A4. when UE carries out sub-district access search, have predefined particular time-slot at interval if search between two deduction time slots, then this frame is first frame in the superframe;
B4. the deduction time slot of the every frame of search in three frames that follow closely behind this frame subtracts 1 with the deduction timeslot number of every frame of searching, obtains corresponding three auxiliary parameter values;
C4. by first, second, third auxiliary parameter order, binary number that its value is corresponding is arranged and is generated a binary sequence, and the decimal number of this binary sequence correspondence is the main scrambler number of present access subzone.
19, method according to claim 18 is characterized in that this method further comprises: the particular time-slot interval that preestablishes two deduction time slots in first frame.
20, method according to claim 19 is characterized in that: described particular time-slot is at interval smaller or equal to 6.
21, method according to claim 18 is characterized in that this method further comprises:
A41. preestablish by four frames and constitute a superframe, this superframe cycle repetition;
B41. two of deductions have particular time-slot time slot at interval in first frame;
C41. in second frame, the 3rd frame and the 4th frame, deduct a time slot respectively; Wherein, the deduction timeslot number of second frame equals the first auxiliary parameter value and adds 1; The deduction timeslot number of the 3rd frame equals the second auxiliary parameter value and adds 1; The deduction timeslot number of the 4th frame equals the 3rd auxiliary parameter value and adds 1.
22,, it is characterized in that this method further comprises according to claim 1,2,3 or 5 described methods:
A5. when UE carried out sub-district access search, if the code word that searches in the current time slots is initial replacement code word, then this time slot was first even number time slot in the superframe;
B5. from second even number time slot of superframe, search for the code word in each even number time slot successively, if the code word in the current search time slot is the first replacement code word, then Dui Ying binary numeral is 0; If the code word in the current search time slot is the second replacement code word, then Dui Ying binary numeral is 1;
C5. forming pairing binary number sequence in proper order from front to back by the even number time slot, is 9 bits with this 14 bit sequential decoding; The decimal number of this 9 bit correspondence is the main scrambler number of present access subzone.
23, method according to claim 22 is characterized in that: described 14 bits of step c5 are to adopt (14,9) grouping encoding protocol to be decoded as 9 bits.
24, method according to claim 22 is characterized in that this method further comprises:
A51. preestablish by two frames and constitute a superframe, this superframe cycle repetition;
B51. 9 bits with current area master scrambler correspondence are encoded to 14 bits;
C51. with 14 bits from a high position to the low level with two frames in 15 even number time slots corresponding one by one from front to back;
D51. from 16 Secondary Synchronization Codes, choose 3 wantonly as first, second and initial replacement code word;
E51. the code word in first even number time slot in two frames is replaced with initial replacement code word; From second even number time slot,, then the code word in this even number time slot is replaced with first and replace code word if the binary bit value of this even number time slot correspondence is 0; If the binary bit value of this even number time slot correspondence is 1, then the code word in this even number time slot is replaced with second and replace code word.
25, method according to claim 24 is characterized in that: described 9 bits of step b51 are to adopt (9,14) grouping encoding protocol to be encoded to 14 bits.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2007118432A1 (en) * | 2006-04-17 | 2007-10-25 | Huawei Technologies Co., Ltd. | System, equipment and method for determining omitted- configuration adjoining cell |
| CN1820431B (en) * | 2003-08-04 | 2010-04-28 | 汤姆森许可贸易公司 | Frame synchronization in universal mobile telephone system |
| CN102158447A (en) * | 2010-02-11 | 2011-08-17 | 中兴通讯股份有限公司 | Scrambling code number detection method and device |
| CN1925376B (en) * | 2005-08-29 | 2011-11-30 | 中兴通讯股份有限公司 | Descending main scrambling code optimum distribution method in broad band CDMA system |
| CN1925377B (en) * | 2005-08-29 | 2011-11-30 | 中兴通讯股份有限公司 | Device and method for generation of WCDMA descending multiple scrambling codes |
| CN103889025A (en) * | 2012-12-21 | 2014-06-25 | 中兴通讯股份有限公司 | Cell capacity searching method and apparatus |
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| CN101132262B (en) * | 2006-08-21 | 2011-04-20 | 大唐移动通信设备有限公司 | Method for implementing synchronous HARQ in TDD system and data transmission |
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| CN1820431B (en) * | 2003-08-04 | 2010-04-28 | 汤姆森许可贸易公司 | Frame synchronization in universal mobile telephone system |
| CN1925376B (en) * | 2005-08-29 | 2011-11-30 | 中兴通讯股份有限公司 | Descending main scrambling code optimum distribution method in broad band CDMA system |
| CN1925377B (en) * | 2005-08-29 | 2011-11-30 | 中兴通讯股份有限公司 | Device and method for generation of WCDMA descending multiple scrambling codes |
| WO2007118432A1 (en) * | 2006-04-17 | 2007-10-25 | Huawei Technologies Co., Ltd. | System, equipment and method for determining omitted- configuration adjoining cell |
| CN102158447A (en) * | 2010-02-11 | 2011-08-17 | 中兴通讯股份有限公司 | Scrambling code number detection method and device |
| CN103889025A (en) * | 2012-12-21 | 2014-06-25 | 中兴通讯股份有限公司 | Cell capacity searching method and apparatus |
| US9432078B2 (en) | 2012-12-21 | 2016-08-30 | Zte Microelectronics Technology Co. Ltd | Method and device for searching cell |
| CN103889025B (en) * | 2012-12-21 | 2017-07-21 | 中兴通讯股份有限公司 | A kind of method and device of cell searching |
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