CN101753514A - Synchronous communication channel realization method, synchronous accession method and mobile terminal - Google Patents
Synchronous communication channel realization method, synchronous accession method and mobile terminal Download PDFInfo
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Abstract
The invention discloses a synchronous communication channel realization method, a macro subdistrict base station, a femto subdistrict base station, a synchronous accession method and a mobile terminal. The synchronous communication channel realization method comprises the following steps: installing a synchronous communication channel comprising a main synchronous communication channel and an auxiliary synchronous communication channel (wherein the main synchronous communication channel is used for synchronizing and carrying the system information, the auxiliary synchronous communication channel comprises a first auxiliary synchronous communication channel and a second auxiliary synchronous communication channel, the first auxiliary synchronous communication channel is used for transmitting the identification information of the macro subdistrict, and the second auxiliary synchronous communication channel is used for transmitting the identification information of a family subdistrict); sending system information sequences carrying the current system information by the macro subdistrict base station through the main synchronous communication channel; and sending macro subdistrict information sequences carrying the subdistrict identification information of the current macro subdistrict through the first auxiliary synchronous communication channel. According to the technical scheme provided by the invention, the accession time can be shortened, and the integral performance of the system can be improved.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of synchronous communication channel realization method, macro cell base station and home cell base station of ofdm system, and a kind of synchronous cut-in method and portable terminal of ofdm system.
Background technology
OFDM (Orthogonal Frequency Division Multiplex, abbreviate OFDM as) be a kind of multi-carrier transmission pattern that is converted to one group of low-speed parallel data flow transmitted by data flow with a high-speed transfer, its advantage is to reduce susceptibility, the raising bandwidth utilization of system to the multidiameter fading channel frequency selectivity greatly, and, owing to introduced Cyclic Prefix, therefore, further strengthened the ability of the anti-intersymbol interference of system (Inter-symbol Interference abbreviates ISI as).And, because the realization of OFDM technology is simple, therefore, make OFDM more and more wider in the application in radio communication basin, for example, WLAN (wireless local area network) (Wireless Local abbreviates WLAN as) system, based on the 802.16e system of orthogonal frequency division multiplexing multiple access, and the follow-on evolution 802.16m of 802.16e system (promptly the 4th generation communication system) etc. all is based on the system of OFDM technology.
Because mobile communication system is smooth evolution, therefore, in order to protect benefits of operators, in the regular hour, the 4th generation communication system and 3-G (Generation Three mobile communication system), as 802.16m system and 802.16E system etc., will coexist.
For realize the 4th generation communication system and the coexistence of 3-G (Generation Three mobile communication system), new communication system the time need be considered compatibility to third generation system as the 4th third-generation mobile communication system in design, it is the backwards compatibility design, can insert the base station of new system with the portable terminal (Mobile Station abbreviates MS as) that guarantees old system such as 16e.
(Femto sub-district, millimicro sub-district, be also referred to as home cell) be small peak nest access point, it connects by broadband internet, and mobile voice, video and data, services for the user in the dwelling house provides enhancing can make full use of existing broadband connection the mobile broadband service is provided in building.
Femto sub-district and macrocell are for covering (overlay) relation, numerous Femto sub-districts is promptly arranged in the coverage of a macrocell usually, and, the Femto sub-district is because coverage is very little, so, it also has the characteristics of distributed in three dimensions except that having densely distributed characteristics, promptly distribute in high-rise blocks.Therefore, a macrocell may cover the nearly femto sub-district more than 50, and therefore, the Cell ID that requires the 16m system to support reaches 1000.
For mobile communication system, MS is usually by synchronizing channel (SynchronizationChannel, abbreviate SCH as) access network, by the related system of the current system of lead code (preamble) transmission, general access step comprises: 1) time, Frequency Synchronization in synchronizing channel; 2) cell ID (Cell ID) detects; 3) broadcast reads.
Through above-mentioned steps, MS begins follow-up access procedure according to the information in the broadcast.
And for mobile communication system, MS inserts and can be divided into initial access and non-initial access process, and wherein, the initial access is meant the MS power supply start connecting system process that powers on, but not initial procedure is the switching access procedure.Wherein, an important index of access procedure is turn-on time, and turn-on time is short more, and systematic function is high more, but need realize by synchronizing channel owing to insert, and SCH has taken certain resource, therefore, and with respect to the Traffic Channel of transmitting subscriber information, SCH is a kind of expense, simultaneously to guarantee access performance again in order economizing on resources, therefore, need between access performance and SCH resource occupation, to carry out balance.
In sum, the 16m system inserts need satisfy following demand: the 1) access of the old system of needs design, so that the MS of old system can insert smoothly; 2) MS of new system can insert smoothly, and simultaneously, the access of new system is compared with the access performance of old system, and raising be arranged; 3) need more sub-district ID number as new system, mobile MS is inserted the support of feomo CelI etc.; 4) multicarrier support; 5) handoff procedure is short; 6) the synchronization channel design expense of new system is little.
And in synchronization channel design, synchronizing sequence need satisfy following demand: have the relevant and their cross correlation of low son, be beneficial to Sequence Detection; The noiseproof feature of many cell scenario requires the orthogonality of sequence; Have low implementation complexity and power consumption characteristic; Can produce enough sequence numbers, in order to satisfy multisystem information, as Cell ID.
Utilize above-mentioned in order to satisfy the demand, need be a kind of synchronizing channel of new system design, if and adopt brand-new SCH design, then consider compatible designing requirement, need in current new system, adopt two cover synchronizing channels, thereby cause overhead to become big, influenced the entire system performance, reduced spectrum efficiency.
Summary of the invention
In view of this, the invention provides a kind of improved synchronizing channel implementation, and a kind of synchronous access scheme is provided on this base station, cause the problem that overhead is big, the entire system performance is not high in order to solve owing to two cover synchronizing channels are set.
According to an aspect of the present invention, provide a kind of synchronous communication channel realization method, wherein, this synchronizing channel is used for realizing the access of portable terminal at ofdm system.
Synchronous communication channel realization method according to the present invention comprises: the synchronizing channel that comprises primary synchronization channel and auxiliary synchronization channel is set, wherein, primary synchronization channel is used for synchronously and carries system information, and auxiliary synchronization channel comprises: first auxiliary synchronization channel and being used to that is used to transmit the identifying information of macrocell transmits second auxiliary synchronization channel of the identifying information of home cell; Macro cell base station sends the system information sequence that carries current system information by primary synchronization channel, and sends the macro cell message sequence of the cell identification information that carries current macrocell by first auxiliary synchronization channel.
Further,, then send the system information sequence that carries current system information, and send the home cell information sequence of the cell identification information that carries current home cell by second auxiliary synchronization channel by primary synchronization channel for the home cell base station.
By another aspect of the present invention, provide a kind of macro cell base station.
Macro cell base station according to the present invention comprises: module and sending module are set.Wherein, module is set, be used to be provided with primary synchronization channel and auxiliary synchronization channel, wherein, primary synchronization channel is used for system information and synchronously, and auxiliary synchronization channel comprises: be used to second auxiliary synchronization channel that transmits first auxiliary synchronization channel of macrocell identifying information and be used to transmit the home cell identifying information; Sending module is used for sending the system information sequence of carrying current system information by primary synchronization channel, and sends the macro cell message sequence of carrying current macrocell identifying information by first auxiliary synchronization channel.
According to a further aspect of the invention, provide a kind of home cell base station.
Comprise according to home cell of the present invention base station: module and sending module are set.Wherein, module is set, be used to be provided with primary synchronization channel and auxiliary synchronization channel, wherein, primary synchronization channel is used for system information and synchronously, and auxiliary synchronization channel comprises: be used to second auxiliary synchronization channel that transmits first auxiliary synchronization channel of macrocell identifying information and be used to transmit the home cell identifying information; Sending module is used for sending the system information sequence of carrying current system information by primary synchronization channel, and sends the home cell information sequence that carries current home cell identifying information by second auxiliary synchronization channel.
According to a further aspect of the invention, provide a kind of synchronous cut-in method, this method is used for initial access or the switching of portable terminal at ofdm system.
Synchronous cut-in method according to the present invention comprises: portable terminal is in the system information sequence of primary synchronization channel reception from macrocell and/or home cell; Portable terminal is according to receiving the cell pattern that the system information sequence is judged current system; If the cell pattern of current system is the macrocell pattern, then portable terminal obtains the macrocell identifying information at first auxiliary synchronization channel; If the cell pattern of current system is the home cell pattern, then portable terminal obtains the home cell identifying information at second auxiliary synchronization channel.Wherein, above-mentioned primary synchronization channel is used for synchronously and the system information of transmission system, and first auxiliary synchronization channel is used to transmit the cell identification information of macrocell, and second auxiliary synchronization channel is used to transmit the cell identification information of home cell.
According to a further aspect of the invention, provide a kind of portable terminal.
Portable terminal comprises according to the present invention: receiver module, judge module, first acquisition module and second acquisition module.Wherein, receiver module is used for by the system information of primary synchronization channel reception from macrocell and/or home cell, and wherein, primary synchronization channel is used for the system information of transmission system; Judge module is used for judging according to the system information that receiver module receives the cell pattern of current system; First acquisition module is used for obtaining the macrocell identifying information from first auxiliary synchronization channel, and wherein, first auxiliary synchronization channel is used to transmit the identifying information of macrocell; Second acquisition module is used for obtaining the home cell identifying information from second auxiliary synchronization channel, and wherein, second auxiliary synchronization channel is used to transmit the identifying information of home cell.
By above-mentioned at least one scheme of the present invention, by adopting the method for designing of classification synchronizing channel, shortened turn-on time, improved the overall performance of system, and,, can pass through auxiliary synchronization channel (Second SynchronizationChannel by above-mentioned at least one scheme, abbreviate S-SCH as) synchronizing channel of multiplexing old system, thus improved spectrum efficiency.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the synchronous communication channel realization method of the embodiment of the invention;
Fig. 2 A is the structured flowchart according to the macro cell base station of the embodiment of the invention;
Fig. 2 B is the structured flowchart according to the home cell base station of the embodiment of the invention;
Fig. 3 is the flow chart according to the synchronous cut-in method of the embodiment of the invention;
Fig. 4 A is the structured flowchart according to the MS of the embodiment of the invention;
Fig. 4 B is the structured flowchart of MS according to the preferred embodiment of the invention;
Fig. 5 is the schematic diagram of SCH among the embodiment one;
Fig. 6 is the schematic diagram of SCH among the embodiment two;
Fig. 7 is the schematic diagram of SCH among the embodiment three;
Fig. 8 is the schematic diagram of SCH among the embodiment four;
Fig. 9 is the time domain structure chart of OFDM symbol in the embodiment of the invention;
Figure 10 is the flow chart of embodiment five;
Figure 11 is the flow chart of embodiment six.
Embodiment
Functional overview
The embodiment of the invention is by the grading design synchronizing channel, synchronizing channel is divided into primary synchronization channel (Primary Synchronization Channel, abbreviate P-SCH as) and auxiliary synchronization channel (Second Synchronization Channel, abbreviate S-SCH as), and further S-SCH is divided into S-SCH1 (i.e. first auxiliary synchronization channel) and S-SCH2 (i.e. second auxiliary synchronization channel), system information by the P-SCH transmission system, as pattern information, macrocell identifying information (being the Cell id information of macrocell) by S-SCH1 transmission macrocell, femto cell identification information (being the Cell id information of fermto sub-district) by S-SCH2 transmission femto sub-district, by P-SCH and S-SCH pattern information with current system, and the macrocell Cell id information of current area or fermto Cell id information are transferred to MS, MS can judge that the current macrocell that should insert still is the femto sub-district according to the pattern information that P-SCH receives, thereby realizes the access or the switching of sub-district.
Wherein, the system information of said system comprises: system bandwidth, Cyclic Prefix (CyclePrefix abbreviates CP as) length, carrier type, system pattern information etc.
Wherein, above-mentioned pattern information is meant the pattern of system, such as, 16e/16m mixed cell pattern, 16m individual cell pattern (macrocell) or fermto cell pattern.
Under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
According to the embodiment of the invention, a kind of synchronous communication channel realization method at first is provided, wherein, this synchronizing channel is used for realizing the access of MS at ofdm system.
For can compatible two kinds of systems, the embodiment of the invention is carried out the classification setting to synchronizing channel, synchronizing channel is divided into primary synchronization channel and auxiliary synchronization channel, wherein, auxiliary synchronization channel comprises first auxiliary synchronization channel that is used to transmit macrocell Cell ID and is used to transmit second auxiliary synchronization channel of the Cell ID of femto sub-district, in specific implementation process, the base station sends to MS by above-mentioned primary synchronization channel and auxiliary synchronization channel respectively with system information under it and cell information.
Fig. 1 is the flow chart according to the synchronous communication channel realization method of the embodiment of the invention, though figure 1 illustrates logical order, but in some cases, can carry out step shown or that describe with the order that is different from herein, as shown in Figure 1, the processing according to the synchronous communication channel realization method of the embodiment of the invention mainly may further comprise the steps (step S101-step S103):
Step S101: the SCH that comprises P-SCH and S-SCH is set, wherein, P-SCH is used for synchronously and the system information of transmission system, and S-SCH comprises: be used to transmit the S-SCH1 of macrocell CellID information and the S-SCH2 that is used to transmit femto sub-district Cell id information;
Step S103: send the system information sequence of carrying current system information by P-SCH, and send the macrocell Cell ID sequence of the Cell id information carry current macrocell by S-SCH1, perhaps, send the femto Cell ID sequence of the Cell id information that carries current fermto by S-SCH2.
Wherein, system information includes but not limited to: the pattern information of system, system bandwidth, CP length etc.
Below further describe each details of above-mentioned processing.
(1) step S101
Particularly, the pattern information that sends by above-mentioned P-SCH be the base station current under a part in the system information of system, wherein, pattern information includes but not limited to: 16e/16m mixed cell pattern, 16m individual cell pattern, fermto cell pattern, and, the multicarrier situation that also comprises current system in the system information disposes/partly disposes carrier information, bandwidth information etc. entirely.
Further, above-mentioned S-SCH2 can be divided into S-SCH21 and S-SCH22, and wherein S-SCH21 carries Femto Cell ID grouping information, and S-SCH22 carries Femto CellID group internal information.
In specific implementation process, in a wireless superframe, P-SCH, SCH (containing S-SCH1 and S-SCH2) adopt time-multiplexed mode, promptly a super frame period, P-SCH, S-SCH1 lay respectively on the different OFDM symbols with S-SCH2, and fixed distance between the three.And as P-SCH, S-SCH1 and S-SCH2, when adopting time-multiplexed mode, the repetition period of P-SCH, S-SCH1 and S-SCH2 can be different.
For S-SCH1 and S-SCH2, can adopt the mode of frequency division multiplexing, be that S-SCH1 takies the different subcarrier of same OFDM symbol with S-SCH2, also can adopt the mode of code division multiplexing, be that S-SCH1 takies the identical subcarrier of same OFDM symbol with S-SCH2, but adopt different sign indicating number sequences;
(2) step S103
In specific implementation process, for macro cell base station and home cell base station, system information all sends by main synchronizing information, particularly, can set in advance the system information sequence of the various system informations of expression, such as, can set in advance the pattern information sequence sets of the various pattern informations of expression, and represent bandwidth sequence sets of various bandwidth etc., each sequence of system before base station selector from the various sequence sets that set in advance is fated, promptly from the pattern information sequence sets, obtain the pattern information sequence of mating with the pattern information of current system, from the bandwidth sequence sets, obtain with the bandwidth sequence of the bandwidth information of current system coupling etc., with the system information sequence of these sequences as current system, send this system information sequence by P-SCH to MS then, particularly, can be in a wireless superframe, and position fixing between wireless superframe head sends the said system information sequence, sends such as first symbol in the superframe head.And, can on the frequency domain of P-SCH, adopt and modulate the said system information sequence every the mode of a subcarrier-modulated, thereby make the time domain of P-SCH have half symbols identical characteristic in front and back in the symbol, be convenient to adopt simple synchronized algorithm, as cross correlation algorithm.
And, be convenient to distinguish macrocell and home cell in order to make terminal, can be provided with between the position of primary synchronization channel of the primary synchronization channel of macro cell base station and home cell base station and have certain skew.
For the current macrocell Cell id information of macro cell base station or, it equally also is the Cell ID sequence sets that sets in advance each macrocell Cell id information correspondence, macro cell base station is obtained the CellID sequence of the macrocell Cell ID correspondence of current area from this sequence sets then, and macro cell base station sends the Cell ID sequence of macrocell by S-SCH1 then;
For the current femto Cell ID of femto cell base station, equally also can set in advance the Cell ID sequence sets of each femto Cell id information correspondence, then, the femto cell base station obtains the Cell ID sequence of the Cell ID correspondence of current femto sub-district from this sequence sets, and sends the femto Cell ID sequence of this femto sub-district by S-SCH2.And, for femto Cell ID sequence phase mutual interference between the femto sub-district that prevents different macrocells, can in each femto Cell ID sequence, add a scramble sequence, wherein, this scramble sequence is corresponding with the Cell ID of the affiliated macrocell of this femto.
Wherein, the Cell ID sequence of macrocell can be on the S-SCH1 frequency domain, adopt and modulate every the mode of 2 subcarrier-modulated, thereby the S-SCH1 of different sectors because the frequency domain quadrature, so, the interference between can reducing.
Wherein, above-mentioned pattern information sequence and Cell id information sequence are formed the SCH sequence of this system.
In above-mentioned steps, the bandwidth of P-SCH is got default fixed value, and the bandwidth of S-SCH1 and S-SCH2 is this fixed value or system bandwidth.
Above-mentioned synchronous communication channel realization method according to the embodiment of the invention, can be with the pattern information of system and the Cell id information of sub-district, be carried at respectively in primary synchronization channel and the auxiliary synchronization channel and send to MS, thereby can realize the compatibility of new system and old system by the synchronizing channel of the multiplexing old system of auxiliary synchronization channel.
According to the embodiment of the invention, a kind of macro cell base station also is provided, this macro cell base station can be used to realize above-mentioned synchronous communication channel realization method.
Fig. 2 A is the structured flowchart according to the macro cell base station of the embodiment of the invention, shown in Fig. 2 A, comprises according to the macro cell base station of the embodiment of the invention: module 21 and sending module 23 are set.Wherein, module 21 is set is used to be provided with primary synchronization channel and auxiliary synchronization channel, wherein, primary synchronization channel is used for system information and synchronous, wherein, system information comprises: pattern information and bandwidth etc., and auxiliary synchronization channel comprises: be used to second auxiliary synchronization channel that transmits first auxiliary synchronization channel of macrocell identifying information and be used to transmit femto cell identification information; Sending module 23 with module 21 be set be connected, be used for sending the pattern information sequence of the pattern information of carrying current system, and send the macro cell message sequence of carrying current macrocell identifying information by first auxiliary synchronization channel by primary synchronization channel.
According to the embodiment of the invention, a kind of home cell base station also is provided, this home cell base station can be used to realize above-mentioned synchronous communication channel realization method.
Fig. 2 B is the structured flowchart according to the home cell base station of the embodiment of the invention, as shown in Figure 3, comprises according to the home cell base station of the embodiment of the invention: module 20 and sending module 22 are set.Wherein, module 20 is set is used to be provided with primary synchronization channel and auxiliary synchronization channel, wherein, primary synchronization channel is used for system information and synchronous, wherein, system information comprises: pattern information and bandwidth etc., and auxiliary synchronization channel comprises: be used to second auxiliary synchronization channel that transmits first auxiliary synchronization channel of macrocell identifying information and be used to transmit femto cell identification information; Sending module 22 with module 20 be set be connected, be used for sending the pattern information sequence of the pattern information of carrying current system, and send the home cell information sequence that carries current home cell identifying information by second auxiliary synchronization channel by primary synchronization channel.
According to the embodiment of the invention, a kind of synchronous cut-in method also is provided, this method is used for initial access or the switching of MS at ofdm system.
Fig. 3 is the flow chart according to the synchronous cut-in method of the embodiment of the invention, though figure 3 illustrates logical order, but in some cases, can carry out step shown or that describe with the order that is different from herein, as shown in Figure 3, the processing according to the synchronous cut-in method of the embodiment of the invention mainly may further comprise the steps (step S301-step S307):
Step S301:MS is in the system information sequence of primary synchronization channel reception from macrocell and/or home cell, and wherein, P-SCH is used for the system information of transmission system with synchronously, wherein, comprises in this system information comprising: pattern information and system bandwidth etc.;
Particularly, if above-mentioned MS inserts ofdm system for the first time, then receive the system information sequence of current system at MS, obtain before the system information of current system, MS also needs to realize time synchronized according to P-SCH, specifically can realize time synchronized by the method for auto-correlation or cross-correlation.
Step S303: judge the cell pattern of current system according to receiving pattern information sequence in the system information sequence, if the cell pattern of current system is the macrocell pattern, execution in step S305 then, if the cell pattern of current system is the home cell pattern, execution in step S307 then;
Particularly, MS can judge the cell pattern of current system according to the pattern information sequence that receives, such as, MS can make related operation with the pattern information sequence of each system that sets in advance with the pattern information sequence that receives, obtain the pattern information sequence of each system and the degree of correlation of the pattern information sequence that receives, thereby determine the signal strength signal intensity of the signal of each system of receiving, all signal strength signal intensities are compared, if wherein the system of signal strength signal intensity maximum is a macrocell, then the cell pattern of current system is the macrocell pattern, if the femto sub-district of signal strength signal intensity maximum wherein, then the cell pattern of current system is the femto sub-district.
Step S305:MS obtains the macrocell identifying information at S-SCH1, and wherein, S-SCH1 is used to transmit the cell identification information of macrocell;
By above-mentioned synchronous communication channel realization method as can be known, the Cell id information of macrocell transmits in S-SCH1, and therefore, when the cell pattern of determining current system was the macrocell pattern, MS was by detecting the Cell id information that S-SCH1 obtains macrocell system.
If the system of the current access of MS is the femto sub-district, then MS need initiate to switch, switch to macrocell, therefore, MS obtains the list information of adjacent macro cell from the broadcast channel of macrocell, according to this list information and the Cell id information that obtains from S-SCH1, obtain the Cell ID of the target macro sub-district that need switch to, read the broadcast channel of target macro sub-district then, and carry out handover operation.
Step S307:MS obtains the home cell identifying information at S-SCH2, and wherein, S-SCH2 is used to transmit the cell identification information of femto sub-district.
By above-mentioned synchronous communication channel realization method as can be known, the Cell id information of femto sub-district transmits in S-SCH2, therefore, when the cell pattern of determining current system was the femto cell pattern, MS was by detecting the Cell id information that S-SCH2 obtains the fermto cell system.
If the system of the current access of MS is a macrocell, then MS need initiate to switch, switch to the femto sub-district, therefore, MS obtains the list information of adjacent femto sub-district from the broadcast channel of femto sub-district, according to this list information and the CellID information of obtaining from S-SCH2, obtain the Cell ID of the target femto sub-district that need switch to, read the broadcast channel of target femto sub-district then, and carry out handover operation.
According to the above-mentioned synchronous cut-in method of the embodiment of the invention, can realize access by the synchronizing channel of grading design, thereby shorten the time of synchronous access, improved the performance of system.
According to the embodiment of the invention, a kind of MS also is provided, this MS can be used for realizing above-mentioned synchronous cut-in method.
Fig. 4 A is the structured flowchart according to the MS of the embodiment of the invention, Fig. 4 B is the structured flowchart of MS according to the preferred embodiment of the invention, shown in Fig. 4 A, comprise according to the MS of the embodiment of the invention: receiver module 41, judge module 43, first acquisition module 45 and second acquisition module 47.Wherein, receiver module 41 is used for by the system information sequence of primary synchronization channel reception from macrocell and/or home cell, and wherein, primary synchronization channel is used to transmit the system information of the pattern information that comprises system; Judge module 43 is connected with receiver module 41, and the pattern information sequence that is used for the system information sequence that receives according to receiver module 41 is judged the cell pattern of current system; First acquisition module 45 is connected with judge module 43, be used for when judge module 43 determines that the cell pattern of current system is the macrocell pattern, obtain the macrocell identifying information from first auxiliary synchronization channel, wherein, first auxiliary synchronization channel is used to transmit the identifying information of macrocell; Second acquisition module 47 is connected with judge module 43, be used for when judge module 43 determines that the cell pattern of current system is the femto cell pattern, obtain the home cell identifying information from second auxiliary synchronization channel, wherein, second auxiliary synchronization channel is used to transmit the identifying information of femto sub-district.
Further, shown in Fig. 4 B, this MS also comprises: time synchronized module 40 is used for realizing by primary synchronization channel the time synchronized of described current system.
In order to further describe the technical scheme that the embodiment of the invention provides, below with 802.16e as old system, 802.16m is an example as new system, and the method to set up of the SCH in the synchronizing channel in the embodiment of the invention is described.
In the ofdm system of 802.16e, a frame (wireless) is divided into several OFDM symbols, and the length of frame is a predetermined value, is 5 milliseconds, and the lead code of 16e (preamble) is positioned on first OFDM symbol of every frame.
In the ofdm system of 16m series, a frame (wireless) length is identical with the frame length of 16e, i.e. 5ms, and the 5ms radio frames is divided into 8 subframes, and 8 subframes are divided into continuous descending sub frame and sub-frame of uplink.Each subframe comprises 6 OFDM symbols.4 radio frames are formed a superframe, so superframe length is 20 milliseconds.
16m and 16e promptly in each radio frames, have part-time to be used for the 16e system with the time division multiplexing mode of blend modes of operation employing frequently, then are used for the 16m system remaining time.Be divided into two kinds of 5MHz and 10MHz with 16m with the 16e system bandwidth of frequently mixing.
The S-SCH1 cycle of synchronizing channel is designed to example with 10ms, and the cycle of P-SCH, S-SCH2 is that 20ms is an example.
If the 16e system of 5MHz and the available subcarrier N of 16m system
Used=432, with N
Used=432 are divided into S
FFR=3 groups, every group of S-SCH1 sequence length is 432/3=144.
If the 16e system of 10MHz and the available subcarrier N of 16m system
Used=864, with N
Used=864 are divided into S
FFR=3 groups, every group of S-SCH2 sequence length is 864/3=288.
In these cases, the P-SCH sequence can be divided into M=9, represents that respectively different system informations is as shown in table 1, wherein table 3,4 behavior pattern information.
Table 1.
| ??M | Scene |
| ??1 | The system of 5MHz |
| ??2 | The system of 10MHz |
| ??3 | 16e/16m mixes scene |
| ??4 | 16m standalone scenario (macrocell) |
| ??5 | 16m femto sub-district |
| ??6 | The conventional CP of 16m |
| ??7 | The short CP of 16m |
| ??8 | 16m disposes carrier wave entirely |
| ??9 | 16m partly disposes carrier wave |
The P-SCH sequence also can be divided into M=4, represents that respectively different system informations is as shown in table 2.
Table 2.
| ??M | Scene |
| ??1 | The 16e/16m of 5MHz mixes scene |
| ??2 | The 16e/16m of 10MHz mixes scene |
| ??M | Scene |
| ??3 | The 16m standalone scenario |
| ??4 | 16m femto sub-district |
Wherein, P-SCH, S-SCH1 and S-SCH2 adopt time-multiplexed mode, and for different mode, P-SCH, S-SCH1 adopt time-multiplexed mode also different with S-SCH2.
Example one
Present embodiment is that example describes with M=3, in the present embodiment, the pattern of system is the self-existent pattern of 16m, P-SCH, S-SCH1 and S-SCH2 adopt time-multiplexed mode as shown in Figure 5, in the superframe of 20ms, P-SCH is positioned at first symbol of first radio frames, broadcast channel (Broadcasting Channel, abbreviate BCH as) be positioned at P-SCH after a symbol (broadcast channel is represented with B in the drawings), S-SCH1 is positioned at first symbol of second radio frames and first symbol of the 4th radio frames, and S-SCH2 is positioned at first symbol of the 3rd radio frames.
Embodiment two
Present embodiment is with M=1, the pattern that is system is the pattern of the 16e frame structure coexistence of 16m and 5MHz bandwidth, Fig. 6 is under this pattern, the schematic diagram of P-SCH and S-SCH in the synchronizing channel, as shown in Figure 6, on time domain, wherein P-SCH is positioned at offset symbol of every frame, BCH then is positioned at the back symbol of P-SCH, and bandwidth fixed is 5MHz.S-SCH1 then is positioned at first symbol of first, second, third and fourth radio frames, the preamble of the 16e of multiplexing 5MHz bandwidth.S-SCH2 is positioned at offset symbol of the 3rd radio frames.
From the angle of frequency domain, P-SCH modulates on the useful subcarrier of 5M Hz bandwidth, and L subcarrier raises system at interval, and L=2 can modulate on odd subcarriers or even subcarriers herein.
And S-SCH1 modulates on the useful subcarrier of 5M Hz bandwidth, and two subcarriers raise system at interval.
When the sequence among the S-SCH1 is the preamble of 16e of 5MHz bandwidth, have 114 sequences, be divided into 3 groups, every group of sector corresponding to a honeycomb, the S-SCH1 of each sector is modulated on the subcarrier original position of different side-play amounts, is modulated at subcarrier 1 as sector 1,4,7, etc., sector 2 is modulated at subcarrier 2,5,8, Deng, sector 3 is modulated at subcarrier 3,6,9, etc.
Embodiment three
Present embodiment is that example describes with M=2, and Fig. 7 is 16e frame structure when coexistence SCH schematic diagram of 16m and 10MHz bandwidth, and on time domain, the position of P-SCH, S-SCH1, S-SCH2 and BCH is identical with the 5MHz situation of Fig. 6.
In the present embodiment, the sequence number of P-SCH is M=2, and its modulation on subcarrier is identical with Fig. 6, and the grouping of S-SCH1 is identical with Fig. 6 with subcarrier modulation modes, and the 16e preamble that adopts 10MHz is as S-SCH1.
Embodiment four
Present embodiment is an example with M=3 and M=4, expression macrocell and femto sub-district Overlay situation.Structure chart when Fig. 8 is the 16m system macrocell of 10M bandwidth and femto sub-district Overlay situation.
In the super frame period of 20ms, the superframe head is arranged in first subframe of first radio frames, and P-SCH is positioned at first symbol of superframe head, and common broadcast channel BCH is positioned on thereafter the OFDM symbol, and sequence number is M=4 and M=3;
In the super frame period of 20ms, two identical S-SCH1 symbols are arranged, lay respectively on first OFDM symbol of the 2nd and the 4th radio frames, like this, the cycle of two S-SCH1 symbols is 10ms, the quick switching that helps portable terminal inserts;
In the super frame period of 20ms, 1 S-SCH2 symbol is arranged, be used to carry the Cell id information of Femto sub-district, because S-SCH2 and S-SCH1 adopt time-multiplexed mode, so,, can not cause interference even the power difference of macrocell and femto sub-district is very big yet.
The time domain structure chart of P-SCH place OFDM symbol when Fig. 9 is L=2, because the mode that P-SCH adopts subcarrier spacing to insert on frequency domain, so, time domain forms the identical two parts in front and back in an OFDM symbol, top is the Cyclic Prefix (CP) of OFDM symbol, is used to eliminate the multi-path influence of wireless channel transmission.
Below further the synchronous cut-in method that the embodiment of the invention provides is described with specific embodiment.
Embodiment five
Present embodiment is an example with initial access, and the synchronous cut-in method that the embodiment of the invention is provided describes.
Figure 10 is the flow chart of present embodiment, and as shown in figure 10, the initial access of MS mainly may further comprise the steps:
Step S111:MS obtains time synchronized by P-SCH:
Step S113:MS is at P-SCH access module information M1;
Step S115: judge the mode type of current system according to pattern information M1, if M1=1,2,3, execution in step S117 then; If M=4, then execution in step S119;
Step S117:MS is by detecting the Cell ID that S-SCH1 obtains macrocell;
Step S119:MS obtains the Cell ID of femto sub-district by detecting S-SCH2.
Embodiment six
Present embodiment switches to example with MS, and the synchronous cut-in method that the embodiment of the invention is provided describes.
Figure 11 is the flow chart of present embodiment, and as shown in figure 11, MS switches mainly and may further comprise the steps:
Step S121:MS continues detecting pattern information M1 by P-SCH;
Step S123: judge the mode type of current system according to pattern information M1, if M1=1,2,3, execution in step S125 then; If M=4, then execution in step S129;
Step S125:MS obtains the tabulation of adjacent macro cell by the broadcast channel of macrocell;
Step S127:MS detects S-SCH1 according to the tabulation of adjacent macro cell, obtains the Cell ID of target macro sub-district, reads the broadcast channel of this target macro sub-district, the beginning handover operation;
Step S129:MS reads the tabulation of adjacent femto sub-district by the broadcast channel of femto sub-district;
Step S131:MS detects S-SCH2 according to the tabulation of adjacent femto sub-district, obtains the Cell ID of target femto sub-district, and reads the broadcast channel of target femto sub-district, the beginning handover operation.
As mentioned above, the technical scheme that provides by the embodiment of the invention, synchronizing channel by the design classification, can support the extensibility of old system bandwidth, simultaneously, the access of the UE of different bandwidth can be supported, and the design of the system that backward compatibility is new can be realized, by the preamble of multiplexing old system, thereby improve spectrum efficiency.And, owing to adopt the lead code design of classification, can shorten the turn-on time of MS, improve the overall performance of system, and increase Cell ID number.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (21)
1. synchronous communication channel realization method, wherein, described synchronizing channel is used for realizing the access of portable terminal at ofdm system, it is characterized in that, described method comprises:
Setting comprises the synchronizing channel of primary synchronization channel and auxiliary synchronization channel, wherein, described primary synchronization channel is used for synchronously and carries system information, and described auxiliary synchronization channel comprises: first auxiliary synchronization channel and being used to that is used to transmit the identifying information of macrocell transmits second auxiliary synchronization channel of the identifying information of home cell;
Macro cell base station sends the system information sequence that carries current system information by described primary synchronization channel, and sends the macro cell message sequence of the cell identification information that carries current macrocell by described first auxiliary synchronization channel.
2. method according to claim 1 is characterized in that, described method also comprises:
The home cell base station sends the system information sequence that carries current system information by described primary synchronization channel, and sends the home cell information sequence of the cell identification information that carries current home cell by described second auxiliary synchronization channel.
3. method according to claim 1 and 2 is characterized in that, adopts time-multiplexed mode to send signal between described primary synchronization channel and the described auxiliary synchronization channel.
4. method according to claim 3 is characterized in that, the repetition period of described primary synchronization channel, described first auxiliary synchronization channel and described second auxiliary synchronization channel is inequality.
5. method according to claim 2 is characterized in that, has skew between the position of the primary synchronization channel of described home cell base station and the primary synchronization channel of described macro base station.
6. method according to claim 2 is characterized in that, adopts the mode of frequency division multiplexing or code division multiplexing to send signal between described first auxiliary synchronization channel and described second auxiliary synchronization channel.
7. method according to claim 2, it is characterized in that, described second auxiliary synchronization channel further comprises: the first sub-auxiliary synchronization channel and the second sub-auxiliary synchronization channel, wherein, the described first sub-auxiliary synchronization channel is used to transmit the grouping information of described home cell identifying information, and the described second sub-auxiliary synchronization channel is used to transmit the group internal information of described home cell identifying information.
8. method according to claim 2 is characterized in that, described home cell information sequence comprise with described current home cell under the corresponding scramble sequence of macrocell.
9. method according to claim 1 and 2 is characterized in that, sends described system information sequence by described primary synchronization channel and comprises:
On the frequency domain of the residing OFDM symbol of described primary synchronization channel, every a subcarrier described system information sequence is modulated, and the described system information sequence after the transmission modulation.
10. method according to claim 1 is characterized in that, sends described macro cell message sequence by described first auxiliary synchronization channel and comprises:
Described macro cell base station is modulated described macro cell message sequence every two subcarriers on the frequency domain of the residing OFDM symbol of described first auxiliary synchronization channel, and sends the described macro cell message sequence after the modulation.
11. method according to claim 1 is characterized in that, described system information comprises: the pattern information of system, bandwidth information.
12. a macro cell base station is characterized in that, comprising:
Module is set, be used to be provided with primary synchronization channel and auxiliary synchronization channel, wherein, described primary synchronization channel is used for system information and synchronously, and described auxiliary synchronization channel comprises: be used to second auxiliary synchronization channel that transmits first auxiliary synchronization channel of macrocell identifying information and be used to transmit the home cell identifying information;
Sending module is used for sending the system information sequence of carrying current system information by described primary synchronization channel, and sends the macro cell message sequence of carrying current macrocell identifying information by described first auxiliary synchronization channel.
13. a home cell base station is characterized in that, comprising:
Module is set, be used to be provided with primary synchronization channel and auxiliary synchronization channel, wherein, described primary synchronization channel is used for system information and synchronously, and described auxiliary synchronization channel comprises: be used to second auxiliary synchronization channel that transmits first auxiliary synchronization channel of macrocell identifying information and be used to transmit the home cell identifying information;
Sending module is used for sending the system information sequence of carrying current system information by described primary synchronization channel, and sends the home cell information sequence that carries current home cell identifying information by described second auxiliary synchronization channel.
14. a synchronous cut-in method is used for initial access or the switching of portable terminal at ofdm system, it is characterized in that described method comprises:
Portable terminal is in the system information sequence of primary synchronization channel reception from macrocell and/or home cell;
Described portable terminal is according to receiving the cell pattern that the system information sequence is judged current system;
If the cell pattern of described current system is the macrocell pattern, then described portable terminal obtains the macrocell identifying information at first auxiliary synchronization channel;
If the cell pattern of described current system is the home cell pattern, then described portable terminal obtains the home cell identifying information at second auxiliary synchronization channel.
15. method according to claim 14, it is characterized in that, described primary synchronization channel is used for synchronously and the system information of transmission system, and described first auxiliary synchronization channel is used to transmit the cell identification information of macrocell, and described second auxiliary synchronization channel is used to transmit the cell identification information of home cell.
16. method according to claim 15 is characterized in that, before described portable terminal received described system information sequence, described method also comprised:
Described portable terminal is realized the time synchronized of described current system by described primary synchronization channel.
17. method according to claim 15 is characterized in that, described portable terminal judges that according to described system information sequence the cell pattern of current system comprises:
Described portable terminal is according to the pattern information sequence in the described system information sequence, obtains the signal strength signal intensity from the signal of macrocell and/or home cell that receives;
Described portable terminal is judged the cell pattern of current system according to described signal strength signal intensity, if the signal strength signal intensity maximum of macrocell, then the cell pattern of current system is the macrocell pattern, if the signal strength signal intensity maximum of home cell, then the cell pattern of current system is the femto cell pattern.
18. method according to claim 15 is characterized in that, when the cell pattern of described current system was the macrocell pattern, described method also comprised:
Described portable terminal obtains the list information of adjacent macro cell from the broadcast channel of macrocell;
Described basis is carried out the detection of macrocell identification code from macrocell identifying information and the described macrocell list information that described first auxiliary synchronization channel obtains, and obtains the cell ID of the target macro sub-district that need switch to;
Described portable terminal reads the broadcast channel of described target macro sub-district, and switches.
19. method according to claim 15 is characterized in that, when the cell pattern of described current system was the home cell pattern, described method also comprised:
Described portable terminal obtains the list information of adjacent home cell from the broadcast channel of home cell;
Described portable terminal carries out the detection of home cell identification code according to the list information of home cell identifying information that obtains from described second auxiliary synchronization channel and described home cell, obtains the cell ID of the target home cell that need switch to;
Described portable terminal reads the broadcast channel of described target home cell, and switches.
20. a portable terminal is characterized in that, comprising:
Receiver module is used for by the system information of primary synchronization channel reception from macrocell and/or home cell, and wherein, described primary synchronization channel is used for the system information of transmission system;
Judge module is used for judging according to the system information that described receiver module receives the cell pattern of current system;
First acquisition module is used for obtaining the macrocell identifying information from first auxiliary synchronization channel, and wherein, described first auxiliary synchronization channel is used to transmit the identifying information of macrocell;
Second acquisition module is used for obtaining the home cell identifying information from second auxiliary synchronization channel, and wherein, described second auxiliary synchronization channel is used to transmit the identifying information of home cell.
21. portable terminal according to claim 20 is characterized in that, described portable terminal also comprises:
The time synchronized module is used for realizing by described primary synchronization channel the time synchronized of described current system.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104081839A (en) * | 2012-11-26 | 2014-10-01 | 华为技术有限公司 | Method and apparatus for sending and receiving synchronous signal |
| CN107295654A (en) * | 2016-03-31 | 2017-10-24 | 华为技术有限公司 | A kind of control information transmission method and base station |
| CN107635281A (en) * | 2017-10-16 | 2018-01-26 | 海信集团有限公司 | A kind of synchronous method and device |
| CN113141619A (en) * | 2016-10-19 | 2021-07-20 | Zte维创通讯公司 | User equipment cell search assistance through synchronization signal bursts |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080016159A (en) * | 2006-08-17 | 2008-02-21 | 삼성전자주식회사 | Method and apparatus for cell search in communication system |
| US7965689B2 (en) * | 2007-05-14 | 2011-06-21 | Motorola Mobility, Inc. | Reference sequence construction for fast cell search |
| CN101102149B (en) * | 2007-08-10 | 2013-01-16 | 中兴通讯股份有限公司 | Method for carrying system information in synchronization sequence of mobile system downlink synchronization system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104081839A (en) * | 2012-11-26 | 2014-10-01 | 华为技术有限公司 | Method and apparatus for sending and receiving synchronous signal |
| CN107295654A (en) * | 2016-03-31 | 2017-10-24 | 华为技术有限公司 | A kind of control information transmission method and base station |
| CN113141619A (en) * | 2016-10-19 | 2021-07-20 | Zte维创通讯公司 | User equipment cell search assistance through synchronization signal bursts |
| CN113141619B (en) * | 2016-10-19 | 2024-06-04 | Zte维创通讯公司 | User equipment cell search assistance through synchronization signal bursts |
| CN107635281A (en) * | 2017-10-16 | 2018-01-26 | 海信集团有限公司 | A kind of synchronous method and device |
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