CN101222269A - Device and method for indicating synchronous channel migration in subdistrict searching - Google Patents

Device and method for indicating synchronous channel migration in subdistrict searching Download PDF

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Publication number
CN101222269A
CN101222269A CNA2007100045553A CN200710004555A CN101222269A CN 101222269 A CN101222269 A CN 101222269A CN A2007100045553 A CNA2007100045553 A CN A2007100045553A CN 200710004555 A CN200710004555 A CN 200710004555A CN 101222269 A CN101222269 A CN 101222269A
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channel
subscriber equipment
synchronization channel
cell
migration
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张玉建
李小强
李周镐
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Abstract

The invention discloses a device and a method used for indicating synchronous channel deviation during subzone searching in a wireless communication system; the method comprises the following steps: a base station transmits a main synchronous channel and a subsidiary synchronous channel twice in each wireless frame; moreover, the main synchronous codes transmitted in the main synchronous channel are identical in the entire network; the base station indicates synchronous channel deviation, i.e. the deviation of the main synchronous channel and the subsidiary synchronous channel in a wireless frame. The method can solve the problem of subzone searching performance reduction occurring in a synchronous network, thereby effectively improving the precision of subzone searching and reducing the time of subzone searching.

Description

The equipment and the method for indication synchronous channel migration in the Cell searching
Technical field
The present invention relates to wireless communication system, particularly in cell search process, indicate the equipment and the method for synchronous channel migration in the wireless communication system.
Background technology
Now, 3GPP standardization body has set about beginning its existing system standard is carried out long-term evolution (LTE, Long Term Evolution).In the middle of numerous physical layer transmission technology, based on OFDM (Orthogonal Frequency Division Multiplexing, hereinafter to be referred as OFDM) the downlink transfer technology and be the focus of research based on the uplink technology that single-carrier frequency division multiple access inserts (Single CarrierFrequency Division Multiple Access is hereinafter to be referred as SC-FDMA).Be a kind of multi-carrier modulation communication technology on the OFDM technological essence, its basic principle is the data flow of a two-forty to be decomposed into several rate data streams transmit simultaneously on one group of mutually orthogonal subcarrier.The OFDM technology is because its multicarrier character has performance advantage aspect a lot.It on the SC-FDMA technological essence a kind of single carrier transmission technology, its signal peak-to-average is than (Peak to Average Power Ratio, hereinafter to be referred as PAPR) lower, thereby the power amplifier of portable terminal can be with higher efficient work, enlarge the coverage of sub-district, by adding Cyclic Prefix (Cyclic Prefix) and frequency domain equalization, it is lower that it handles complexity simultaneously.
According to existing discussion result about LTE, be LTE system descending frame structure as shown in Figure 1, Radio Resource in the LTE system is meant time and the frequency resource that system or subscriber equipment can take, can (101-103) do differentiation with radio frames (Radio Frame) for unit, the time span of radio frames is identical with the time span of the radio frames of WCDMA system, and promptly its time length is 10ms; Each frame is subdivided into a plurality of time slots (Slot) (104-107), and present hypothesis is that each radio frames comprises 20 time slots, and time slots length is 0.5ms; Each time slot comprises a plurality of OFDM symbols again, and according to present hypothesis, the time span of effective OFDM symbol is about 66.7 μ s in the LTE system.The time span of the CP of OFDM symbol can have two kinds, promptly the time span of short CP is approximately 4.8 μ s, the about 16.7 μ s of the time span of long CP, long CP time slot is used for many Cell Broadcast CB/multicasts and the very large situation of radius of society, short CP time slot (108) comprises 7 OFDM symbols, and long CP time slot (109) comprises 6 OFDM symbols.
In ofdm system,, then be local formula transmission if user's data is mapped on the continuous sub-carriers.If user's data is mapped on the subcarrier of dispersion, then be distributed transmission.The employed subcarrier of subscriber equipment in the same sub-district usually can be not overlapping, and this resource distribution mode is called as the orthogonal resource allocation at frequency domain.The method of salary distribution at the orthogonal resource of time domain is that the base station uses different time slot or OFDM symbols to transmit data to the subscriber equipment in the same sub-district.The resource distribution mode of comprehensive frequency domain and time domain can be distributed to the user in the mode of time domain and frequency domain two dimension lattice with descending resource in ofdm system.
In the wireless communication system, the design of Cell searching is a very important aspect.The definition of Cell searching has two aspects: be meant subscriber equipment after start on the one hand, the process of search and access network; Be meant portable terminal on the other hand behind the access network, the process of searching for other sub-districts outside the current area for the needs of RRMs such as switching.In the previous case and since subscriber equipment usually do not have more can reference information, the process of search usually can be longer, as greater than the hundreds of millisecond; When latter event, because subscriber equipment can obtain the information of adjacent cell from current area, some step of Cell searching can be omitted, thereby the process of search is shorter usually, as less than a few tens of milliseconds.
In Wideband Code Division Multiple Access (WCDMA) (Wideband CDMA is hereinafter to be referred as WCDMA) system, Cell searching divided for three steps realized:
The first step: slot synchronization.In WCDMA, primary synchronization channel (Primary Synchronization Channel) is launched in the base station in each time slot, and the code word of transmitting in primary synchronization channel is called as Primary Synchronisation Code (Primary Synchronization Code).Whole network is used identical Primary Synchronisation Code.Subscriber equipment uses matched filter (being complementary with Primary Synchronisation Code) that the signal that receives is operated, and promptly determines the timing relationship of time slot by the peak value that detects matched filter output.
Second step: frame synchronization and the identification of scrambler group.In WCDMA, similar with Primary Synchronisation Code, secondary synchronization channel (Secondary SynchronizationChannel) is launched in the base station in each time slot, the code word of transmitting in secondary synchronization channel is called as secondary synchronization code (SecondarySynchronization Code).Different with Primary Synchronisation Code is that secondary synchronization code has 16.A secondary synchronization code is launched in the sub-district in the middle of 15 time slots of each frame.Have the sequence correspondence of 64 secondary synchronization code the scrambler group, and the sequence of the cyclic shift of these 64 sequences is all inequality, thereby the possibility of the sequence that subscriber equipment can be by relevant all secondary synchronization code obtain the timing relationship of scrambler group and definite frame.
The 3rd step: identification scrambler.In WCDMA, the data of each cell downlink emission are all by the scrambling of scrambler institute.There is a main scrambler (Primary Scrambling Code) each sub-district, and broadcast channel, primary common pilot etc. all adopts main scrambler to come scrambling.Maximum can be supported 512 main scramblers in the WCDMA system, and one group of correspondence of per 8 main scramblers 1 scrambler group.When subscriber equipment after second step obtained the information of scrambler group, subscriber equipment can be by testing 8 possible main scramblers to the relevant result of primary common pilot.After subscriber equipment was discerned main scrambler, subscriber equipment can utilize public guide frequency to carry out the information that broadcast channel was deciphered and read to channel estimating.
In the LTE system, the flow process that the design of Cell searching is supposed at present as shown in Figure 2.
201 subscriber equipmenies among above-mentioned Fig. 2 obtain 5 milliseconds of timings by detecting primary synchronization channel.Primary Synchronisation Code also is the whole network unanimity in LTE, but only launches in specific time slot.Because primary synchronization channel transmits twice in a radio frames, after subscriber equipment has obtained the timing relationship of Primary Synchronisation Code by matched filter, just obtained 5 milliseconds of timing relationships like this.
202 subscriber equipmenies among above-mentioned Fig. 2 obtain radio frames timing and cell group sign by detecting secondary synchronization channel.Similar with WCDMA, secondary synchronization code is that the sub-district is relevant.Difference is that secondary synchronization code is similar with Primary Synchronisation Code, only launches in specific time slot.Subscriber equipment is discerned the employed secondary synchronization code in sub-district by relevant all possible secondary synchronization code.After secondary synchronization code was obtained, subscriber equipment had obtained the timing relationship of radio frames simultaneously, and the cell group under the current area.Depend in addition and concrete design that secondary synchronization channel also may be indicated the number of base station down transmitting antenna.
203 subscriber equipmenies among above-mentioned Fig. 2 obtain cell ID by reference signal detection.In LTE, corresponding with the public guide frequency of WCDMA is reference signal (Reference Signal).Subscriber equipment has obtained the information of cell group sign in step 202 after, by testing and discern cell ID to the relevant result of reference signal.In LTE, the reference signal sequence of two dimension is to be produced by the orthogonal sequence (Orthogonal Sequence) of two dimension and two-dimentional pseudo random sequence (Pseudo-Random Sequence).The number of orthogonal sequence is 3, and the number of pseudo random sequence is about 170.The sign correspondence of each sub-district unique combination of orthogonal sequence and pseudo random sequence, therefore nearly 510 unique cell IDs.
The information of main broadcast channel is read in 204 subscriber equipmenies decoding among above-mentioned Fig. 2.Similar with WCDMA, subscriber equipment can utilize reference signal to carry out the information that main broadcast channel was deciphered and read to channel estimating.In LTE, broadcast channel is divided into two kinds: main broadcast channel (Primary BroadcastChannel) and time broadcast channel (Secondary Broadcast Channel).Main broadcast channel is the broadcast channel that sends on specific running time-frequency resource.What transmit usually in the main broadcast channel is outbalance in the sub-district, and the information that need in time obtain as the sign of sub-district in network, inserts relevant information at random, and the configuration information of inferior broadcast channel.Inferior broadcast channel normally be scheduled the transmission, its content comprises other information relevant with system.
Prior LTE system is supported the multicast/broadcast technology.Multicast/broadcast is a kind of technology that transmits data message from a data source to a plurality of targets.In ofdm system, adopt single frequency network (SingleFrequency Network) technology to realize that multicast/broadcast can greatly improve professional data rate and covering.The single frequency network technology is meant that each sub-district that participates in multicast/broadcast uploads defeated identical content at identical running time-frequency resource.This technology is to the requirement that strictness is arranged synchronously between the base station.After adopting the single frequency network technology, adopt existing Cell searching technology, the employed running time-frequency resource of all primary synchronization channels and secondary synchronization channel is identical, mainly contains the influence of two aspects for the performance of Cell searching:
The first, the influence that detects for primary synchronization channel.When radius of society was big, subscriber equipment may detect the primary synchronization channel of sub-district far away emission mistakenly, thereby deviation appears in 5 milliseconds of timing relationships that cause obtaining.
The second, the influence that detects for secondary synchronization channel.Usually the detection to secondary synchronization channel can utilize primary synchronization channel to carry out channel estimating.Because Primary Synchronisation Code is the whole network unanimity, and launches on identical running time-frequency resource, therefore the channel estimating of obtaining from primary synchronization channel is the stack of the channel of the nearer a plurality of sub-districts of distance users equipment.But detect secondary synchronization channel and only need obtain the channel situation of subscriber equipment sub-district of living in usually.Therefore the unmatched situation of this channel estimating can seriously influence the performance that secondary synchronization channel detects.
For above-mentioned problem, a solution in LTE research is to adopt a plurality of Primary Synchronisation Codes at present, and makes adjacent sub-district adopt different Primary Synchronisation Codes by the network planning.The defective of this scheme is: owing to adopted a plurality of Primary Synchronisation Codes, the complexity that detects Primary Synchronisation Code increases, and the precision that detects Primary Synchronisation Code simultaneously also descends to some extent.
Summary of the invention
The purpose of this invention is to provide the equipment and the method for in cell search process, indicating synchronous channel migration in a kind of wireless communication system.
According to an aspect of of the present present invention, in cell search process, indicate the method for synchronous channel migration in a kind of wireless communication system, comprise step:
A) twice primary synchronization channel and secondary synchronization channel are transmitted in the base station in each radio frames, and the Primary Synchronisation Code that transmits in the described primary synchronization channel is identical in whole network;
B) base station indication synchronous channel migration, described synchronous channel migration is meant the skew in radio frames of primary synchronization channel and secondary synchronization channel.
According to another aspect of the present invention, a kind of subscriber equipment carries out the method for Cell searching, comprises step:
A) subscriber equipment obtains slot timing by detecting primary synchronization channel;
B) subscriber equipment obtains radio frames timing, cell group sign and synchronous channel migration by detecting secondary synchronization channel;
C) subscriber equipment obtains cell ID by reference signal detection;
D) information of main broadcast channel is read in subscriber equipment decoding.
According to another aspect of the present invention, a kind of subscriber equipment carries out the method for Cell searching, comprises step:
A) subscriber equipment obtains slot timing by detecting primary synchronization channel;
B) subscriber equipment obtains the cell group sign by detecting secondary synchronization channel;
C) subscriber equipment obtains cell ID by reference signal detection, synchronous channel migration, and radio frames is regularly;
D) information of main broadcast channel is read in subscriber equipment decoding.
According to another aspect of the present invention, a kind of subscriber equipment carries out the method for Cell searching, comprises step:
A) subscriber equipment obtains slot timing by detecting primary synchronization channel;
B) subscriber equipment obtains the cell group sign by detecting secondary synchronization channel;
C) the subscriber equipment reference signal detection obtains cell ID;
D) subscriber equipment is deciphered the information that main broadcast channel reads synchronous channel migration and other broadcast channel, and obtains radio frames regularly.
According to another aspect of the present invention, the emission synchronizing channel in a kind of wireless communication system and the base station equipment of main broadcast channel comprise radiating portion, also comprise:
Synchronizing channel and main broadcast channel control module, be used for according to the synchronous channel migration value that the network planning is determined determine how to transmit primary synchronization channel, secondary synchronization channel and main broadcast channel;
Described emitter is transmitted into primary synchronization channel, secondary synchronization channel and main broadcast channel in the wireless channel.
According to another aspect of the present invention, the subscriber equipment that carries out Cell searching in a kind of wireless communication system comprises receiving unit, also comprises:
The physical channel demodulation multiplexer is used for going out primary synchronization channel, secondary synchronization channel, reference signal, main broadcast channel and other physical channels from the received signal demultiplexing;
The Cell searching control module is used for obtaining the synchronous channel migration value and obtaining radio frames thus regularly from secondary synchronization channel.
According to another aspect of the present invention, the subscriber equipment that carries out Cell searching in a kind of wireless communication system comprises receiving unit, also comprises:
The physical channel demodulation multiplexer is used for going out primary synchronization channel, secondary synchronization channel, reference signal, main broadcast channel and other physical channels from the received signal demultiplexing;
The Cell searching control module is used for obtaining the synchronous channel migration value and obtaining radio frames thus regularly from reference signal.
According to another aspect of the present invention, the subscriber equipment that carries out Cell searching in a kind of wireless communication system comprises receiving unit, also comprises:
The physical channel demodulation multiplexer is used for going out primary synchronization channel, secondary synchronization channel, reference signal, main broadcast channel and other physical channels from the received signal demultiplexing;
The Cell searching control module is used for obtaining the synchronous channel migration value and obtaining radio frames thus regularly from main broadcast channel.
Adopt the method for in cell search process, indicating synchronous channel migration of the present invention's proposition, can solve the problem of the Cell searching decreased performance that in the middle of synchronizing network, occurs, improve the precision of Cell searching effectively, reduce the time of Cell searching.
Description of drawings
Fig. 1 is the frame structure of descending ofdm system among the LTE;
Fig. 2 is the operation of existing Cell searching among the LTE;
Fig. 3 is the example of 3 synchronous channel migration values of configuration in the LTE system;
Fig. 4 is the example of 3 synchronous channel migration values of network configuration;
Fig. 5 is the mode of operation one that subscriber equipment carries out Cell searching;
Fig. 6 is the mode of operation two that subscriber equipment carries out Cell searching;
Fig. 7 is the mode of operation three that subscriber equipment carries out Cell searching;
Fig. 8 is the equipment drawing of base station synchronizing channel and main broadcast channel;
Fig. 9 is the equipment drawing that subscriber equipment carries out Cell searching;
Figure 10 is an example of base station transmitter hardware block diagram;
Figure 11 is an example of subscriber equipment receiver hardware block diagram.
Embodiment
The present invention proposes the equipment and the method for in cell search process, indicating synchronous channel migration in a kind of wireless communication system.
The operation of base station:
A) twice primary synchronization channel and secondary synchronization channel are transmitted in the base station in each radio frames, and the Primary Synchronisation Code that transmits in the described primary synchronization channel is identical in whole network;
B) base station indication synchronous channel migration, described synchronous channel migration is meant the skew in radio frames of primary synchronization channel and secondary synchronization channel.
In the step a) of the present invention, twice primary synchronization channel and secondary synchronization channel are transmitted in the base station in each radio frames, and the Primary Synchronisation Code that transmits in the described primary synchronization channel is identical in whole network.The value of primary synchronization channel and the skew of secondary synchronization channel in radio frames can be different corresponding to different sub-districts.In the present invention, the skew in radio frames of primary synchronization channel and secondary synchronization channel refers to primary synchronization channel and the slot offset of secondary synchronization channel in radio frames; And the fixed-site of primary synchronization channel and secondary synchronization channel residing OFDM symbol in each time slot.When the individual time slot of 2M (M＞0) was arranged in each radio frames, because each radio frames twice primary synchronization channel of interior transmission and secondary synchronization channel, a kind of design of symmetry was 1 primary synchronization channel of every M slot transmission and secondary synchronization channel.Primary synchronization channel can have M different deviant at most with secondary synchronization channel like this.For the consideration that reduces expense and simplification, can only dispose N (the individual deviant of 2≤N≤M) in the actual disposition.Corresponding to the LTE system, 20 time slots are arranged in each radio frames, therefore the number of the deviant that can dispose is 2,3,4,5,6,7,8,9,10.Fig. 3 is the example of 3 synchronous channel migration values of configuration in the LTE system.Shown in Figure 3 is the structure of short CP.At Fig. 3, the OFDM symbol 302 of transmission primary synchronization channel is the 7th an OFDM symbol in each time slot, the OFDM symbol 303 of transmission secondary synchronization channel is the 6th an OFDM symbol in each time slot, and the OFDM symbol 304 of transmission of reference signals is the 1st and the 4th OFDM symbol in each time slot.3 different deviants in each radio frames, have been disposed: skew S 1, skew S 2, skew S 3Skew S 1The time slot 301 that is meant transmission primary synchronization channel and secondary synchronization channel is the 1st and the 11st time slots in the radio frames; Skew S 2The time slot 301 that is meant transmission primary synchronization channel and secondary synchronization channel is the 4th and the 14th time slots in the radio frames; Skew S 3The time slot 301 that is meant transmission primary synchronization channel and secondary synchronization channel is the 7th and the 17th time slots in the radio frames.
The skew value of each concrete sub-district is configured by network.For asynchronous network, owing to there be not the synchronous of strictness between each base station, therefore a kind of configuration mode is that identical deviant is adopted in all sub-districts; Also can be that in the possible deviant is adopted in different sub-districts.For synchronous network, be example with 3 deviants, a kind of network configuration mode is as shown in Figure 4.In Fig. 4, skew S is adopted in sub-district 404,405 and 406 1, skew S is adopted in sub-district 401,407 and 408 2, skew S is adopted in sub-district 402,403 and 409 3Adopt the sub-district of same offset value non-conterminous geographically, the influence between the dimension synchronizing channel is less.
In the step b) of the present invention, the processing mode one of base station indication synchronous channel migration is meant that the base station indicates deviant in secondary synchronization channel.This mode has two kinds of implementations.The 1st kind of implementation method is with deviant indication separately in secondary synchronization channel.Under this implementation method, the base station is except transmission cell group sign (and number of the downlink antenna that may transmit) in secondary synchronization channel, and the base station is the deviant of transfer synchronous channel also.If synchronizing channel has N different deviant, then need
Figure A20071000455500131
Individual bit is indicated deviant, and wherein [x] representative is to the x operation that rounds up.The 2nd kind of implementation method is meant the cell group sign indication synchronous channel migration that transmits the base station in secondary synchronization channel.The assumes synchronization channel has N different deviant S 1, S 2... .S N, P cell group sign G arranged 1, G 2..., G P, and P 〉=N (usually for the ease of network design, P＞＞N).A kind of sign by cell group indicates the method for synchronous channel migration to be: definition
Figure A20071000455500132
Then be offset S 1Pairing cell group sign is G 1To G Z, skew S 2Pairing cell group sign is G Z+1To G 2Z..., skew S i(i＜N) pairing cell group sign is G (i-1) Z+1To G IZ..., skew S NPairing cell group sign is G (N-1) Z+1To G PIt should be noted that common P is the integral multiple of N, but aforementioned algorithm is equally applicable to the situation that P is not the N integral multiple.
In the step b) of the present invention, the processing mode two of base station indication synchronous channel migration is meant that the base station indicates deviant in reference signal.The 1st kind of implementation method is to indicate synchronous channel migration by the base station with the orthogonal sequence in the reference signal.Because the number of the orthogonal sequence in the LTE system is 3 at present, therefore in the method, the number of the deviant of synchronizing channel is 3.Like this, orthogonal sequence and synchronous channel migration are to concern one to one.Be orthogonal sequence OS 1Corresponding to skew S 1, orthogonal sequence OS 2Corresponding to skew S 2, and orthogonal sequence OS 3Corresponding to skew S 3The 2nd kind of implementation method is meant that the base station indicates synchronous channel migration by cell ID.The assumes synchronization channel has N different deviant S 1, S 2... .S N, Q cell group sign C arranged 1, C 2... .., C Q, and Q 〉=N (usually for the ease of network design, Q＞＞N).A kind ofly indicate the method for synchronous channel migration to be: definition by cell ID
Figure A20071000455500141
Then be offset S 1Pairing cell ID is C 1To C Y, skew S 2Pairing cell ID is C Y+1To C 2Y..., skew S i(i＜N) pairing cell ID is C (i-1) Y+1To C IY..., skew S NPairing cell ID is C (N-1) Y+1To C QIt should be noted that common Q is the integral multiple of N, but aforementioned algorithm is equally applicable to the situation that Q is not the N integral multiple.
In the step b) of the present invention, the processing mode three of base station indication synchronous channel migration is meant that the base station indicates synchronous channel migration in main broadcast channel.If synchronizing channel has N different deviant, then need
Figure A20071000455500142
Individual bit is indicated deviant.The information of deviant and the content of other broadcast channel are carried out chnnel coding, rate-matched, and modulation, OFDM modulation etc. operates in the main broadcast channel to be transmitted.
The operation of subscriber equipment:
Corresponding to the processing mode one of indication synchronous channel migration in base station mentioned above, the step when subscriber equipment carries out Cell searching as shown in Figure 5.
501 subscriber equipmenies among above-mentioned Fig. 5 obtain slot timing by detecting primary synchronization channel.Different with step 201 is, because primary synchronization channel can have different deviants in radio frames, so subscriber equipment can't obtain 5 milliseconds of timings, and can only obtain slot timing.
502 subscriber equipmenies among above-mentioned Fig. 5 obtain radio frames regularly, cell group sign, and synchronous channel migration by detecting secondary synchronization channel.Different with step 202 is, because deviant is indicated in the base station in secondary synchronization channel, subscriber equipment can also obtain the synchronous channel migration value except can obtain cell group sign (and number of the downlink antenna that may transmit) from secondary synchronization channel.Subscriber equipment can obtain radio frames regularly according to the synchronous channel migration value.In this step, corresponding to the 1st kind of implementation method mentioned above (being that the base station is with deviant indication separately in secondary synchronization channel), subscriber equipment directly reads deviant from secondary synchronization channel.Corresponding to the 2nd kind of implementation method mentioned above (being that the cell group sign that transmit in secondary synchronization channel the base station has been indicated synchronous channel migration), subscriber equipment obtains deviant from the cell group sign.Corresponding relation with the sign of the cell group described in above and deviant is an example, is designated G when subscriber equipment detects cell group iThe time, the subscriber equipment deducibility goes out the synchronous channel migration value and is
Figure A20071000455500151
503 identical among above-mentioned Fig. 5 with step 203,504 identical among above-mentioned Fig. 5 with step 204.
Corresponding to the processing mode two of indication synchronous channel migration in base station mentioned above, the step when subscriber equipment carries out Cell searching as shown in Figure 6.
601 subscriber equipmenies among above-mentioned Fig. 6 obtain slot timing by detecting primary synchronization channel.Different with step 201 is, because primary synchronization channel can have different deviants in radio frames, so subscriber equipment can't obtain 5 milliseconds of timings, and can only obtain slot timing.
602 subscriber equipmenies among above-mentioned Fig. 6 obtain the cell group sign by detecting secondary synchronization channel.Different with step 202 is, because subscriber equipment can't obtain the information of synchronous channel migration, subscriber equipment can't determine that radio frames regularly.
603 subscriber equipment reference signal detection among above-mentioned Fig. 6 obtain cell ID, synchronous channel migration, and radio frames is regularly.Different with step 203 is that because deviant is indicated in the base station in reference signal, subscriber equipment can also obtain the synchronous channel migration value except obtaining the cell ID from reference signal.Subscriber equipment can obtain radio frames regularly according to the synchronous channel migration value.In this step, corresponding to the 1st kind of implementation method mentioned above (being that synchronous channel migration is indicated with the orthogonal sequence in the reference signal in the base station), subscriber equipment obtains synchronous channel migration according to the orthogonal sequence in the reference signal.Corresponding to the 2nd kind of implementation method (being that synchronous channel migration is indicated by cell ID in the base station) mentioned above, subscriber equipment obtains deviant from cell ID.With the cell ID described in above and the corresponding relation of deviant is example, is C when subscriber equipment detects cell ID iThe time, the subscriber equipment deducibility goes out the synchronous channel migration value and is
Figure A20071000455500152
604 identical among above-mentioned Fig. 6 with step 204.
Corresponding to the processing mode three of indication synchronous channel migration in base station mentioned above, the step when subscriber equipment carries out Cell searching as shown in Figure 7.
701 subscriber equipmenies among above-mentioned Fig. 7 obtain slot timing by detecting primary synchronization channel.Different with step 201 is, because primary synchronization channel can have different deviants in radio frames, so subscriber equipment can't obtain 5 milliseconds of timings, and can only obtain slot timing.
702 subscriber equipmenies among above-mentioned Fig. 7 obtain the cell group sign by detecting secondary synchronization channel.Different with step 202 is, because subscriber equipment can't obtain the information of synchronous channel migration, subscriber equipment can't determine that radio frames regularly.
703 subscriber equipment reference signal detection among above-mentioned Fig. 7 obtain cell ID.
704 subscriber equipmenies among above-mentioned Fig. 7 are deciphered the information that main broadcast channel reads synchronous channel migration and other broadcast channel, and obtain radio frames regularly.Different with step 204 is, because deviant is indicated in the base station in main broadcast channel, subscriber equipment can obtain radio frames regularly according to the synchronous channel migration value.
In the equipment drawing of base station synchronizing channel and main broadcast channel, the synchronizing channel of base station and main broadcast channel control module 801 are embodiments of the present invention as shown in Figure 8.The synchronous channel migration value that the synchronizing channel of base station and main broadcast channel control module 801 are determined according to the network planning determines how to transmit primary synchronization channel, secondary synchronization channel and main broadcast channel and correspondingly launch in emitter 802.Concrete base station hardware block diagram provides in an embodiment.
Subscriber equipment carries out in the equipment drawing of Cell searching as shown in Figure 9, and the Cell searching control module 903 of subscriber equipment is embodiment of the present invention.901 receiving systems receive the radiofrequency signal that the base station sends, and carry out processing back demultiplexings in module 902 physical channel demodulation multiplexers such as radio frequency reception and analog-to-digital conversion and go out primary synchronization channel 904, secondary synchronization channel 905, reference signal 906, main broadcast channel 907 and other physical channels 908.The process of Cell searching control module 903 control Cell searchings.Particularly, corresponding to the processing mode one of indication synchronous channel migration in base station mentioned above, the Cell searching control module is obtained the synchronous channel migration value and is obtained radio frames thus regularly from secondary synchronization channel; Corresponding to the processing mode two of indication synchronous channel migration in base station mentioned above, the Cell searching control module is obtained the synchronous channel migration value and is obtained radio frames thus regularly from reference signal; Corresponding to the processing mode three of indication synchronous channel migration in base station mentioned above, the Cell searching control module is obtained the synchronous channel migration value and is obtained radio frames thus regularly from main broadcast channel.Concrete subscriber equipment receives hardware block diagram and provides in an embodiment.
Embodiment
This part has provided three embodiment of this invention.Too tediously long for fear of the description that makes this patent, in the following description, omitted the detailed description of function that the public is known or device etc.
First embodiment:
In the present embodiment, the cell group sign indication synchronous channel migration that in secondary synchronization channel, transmits of base station.As shown in Figure 3, initialization system is supported 3 synchronous channel migrations: skew S 1, skew S 2And skew S 334 cell group sign G are arranged in the initialization system simultaneously 1, G 2..., G 34, and the corresponding relation of cell group sign and synchronous channel migration is skew S 1Pairing cell group sign is G 1To G 12, skew S 2Pairing cell group sign is G 13To G 24, skew S 3Pairing cell group sign is G 25To G 36
The operation of base station is as described below.Setting is according to the network planning, and the synchronous channel migration of sub-district is skew S 2, then the cell group that can use of this sub-district is designated G 13To G 24, the cell group of setting this sub-district is designated G 20Then the base station is in the 4th and the 14th slot transmission primary synchronization channel and secondary synchronization channel of radio frames, and the cell group of transmitting in secondary synchronization channel simultaneously is designated G 20
The operation of subscriber equipment is as described below.At first subscriber equipment obtains slot timing by detecting primary synchronization channel.Subscriber equipment detects secondary synchronization channel and obtains cell group sign (and number of the downlink antenna that may transmit) then.Because subscriber equipment detects the cell group of transmitting in the secondary synchronization channel and is designated G 20, the synchronous channel migration that subscriber equipment can calculate the sub-district is skew S 2, promptly primary synchronization channel and secondary synchronization channel be in the 4th and the 14th slot transmission of radio frames, so subscriber equipment can obtain radio frames regularly.The subscriber equipment reference signal detection obtains cell ID then, and the information of broadcast channel is read in decoding.
Figure 10 is an example of base station hardware block diagram of the present invention.Thereby the synchronous channel migration value that the synchronizing channel of base station and main broadcast channel control module 801 are determined according to the network planning is determined primary synchronization channel and the secondary synchronization channel deviant in radio frames and is correspondingly controlled physical channel multiplexer 1012; Synchronizing channel and main broadcast channel control module 801 also identify according to the selected cell group of the network planning and select secondary synchronization code 1006.Broadcast message 1001 is encoded in channel coding module 1002, after handling through rate-matched module 1003, then interweaves in interleaver 1004 and modulation in module 1005, and is multiplexing with other physical channels in module 1012 then.Multiplexing with other physical channels in module 1012 by the secondary synchronization code 1006 that synchronizing channel and main broadcast channel control module 801 are selected through module 1007 modulation backs.Primary Synchronisation Code 1008 is multiplexing with other physical channels in module 1012 through module 1009 modulation backs.Main broadcast channel after physical channel multiplexer 1012 will be modulated, primary synchronization channel, secondary synchronization channel, reference signal 1010 and other down channels 1011 carry out multiplexing.This multiplex mode both can be multiplexing on the time domain, also can be multiplexing on the frequency domain.Be transformed to time-domain signal through the frequency-region signal after multiplexing by IFFT module 1013.Signal adds CP with the interference between the elimination subcarrier in module 1014 then, and process D/A 1015 is an analog signal with digital signal transition.Signal enters radio frequency sending set 1016 and carries out the relevant operation of radio frequency afterwards.The signal that comes out from radio frequency sending set is transmitted into the wireless channel by antenna 1017.
Figure 11 is the example that subscriber equipment of the present invention receives hardware block diagram.The signal of base station down emission is received by the antenna 1120 of subscriber equipment, enters the radio-frequency transmitter 1119 of subscriber equipment.The main task of radio-frequency transmitter is to adjust oscillator, and does automatic gain control.Received signal is a digital signal from analog signal sampling in A/D converter 1118 then.Digital signal is removed CP in module 1117, and through FFT module 1116 from time-domain signal change frequency-region signal into and module 902 physical channel demodulation multiplexers demultiplexing go out secondary synchronization channel 1110, main broadcast channel 1107, primary synchronization channel 1112, reference signal 1114 and other down channels 1115.The main broadcast channel 1107 that demultiplexing goes out carries out frequency domain equalization and removes the influence that wireless channel applies signal in module 1106, demodulation in module 1105 then, deinterleaving in the module 1104, separate rate-matched in the module 1103, channel decoding recovers the broadcast message 1101 of emission in the module 1102.Secondary synchronization channel that demultiplexing goes out 1110 is through be correlated with out secondary synchronization code 1108 and it is delivered to Cell searching control module 903 of matched filters 1109.The primary synchronization channel 1112 that demultiplexing goes out is correlated with through matched filter 1111 and is obtained the slot timing of sub-district.The reference signal 1114 that demultiplexing goes out is correlated with through matched filter 1113 and is obtained cell ID.Cell searching control module 903 is obtained the synchronous channel migration value according to secondary synchronization code 1108 and is obtained radio frames thus regularly.
Second embodiment:
In the present embodiment, synchronous channel migration is indicated with the orthogonal sequence in the reference signal in the base station.As shown in Figure 3, initialization system is supported 3 synchronous channel migrations: skew S 1, skew S 2And skew S 3In the initialization system 3 orthogonal sequence: OS are arranged simultaneously 1, OS 2, and OS 3And the corresponding relation of orthogonal sequence and synchronous channel migration is orthogonal sequence OS 1Corresponding to skew S 1, orthogonal sequence OS 2Corresponding to skew S 2, and orthogonal sequence OS 3Corresponding to skew S 3
The operation of base station is as described below.Setting is according to the network planning, and the synchronous channel migration of sub-district is skew S 2, then the orthogonal sequence of this sub-district is OS 2Then the base station is in the 4th and the 14th slot transmission primary synchronization channel and secondary synchronization channel of radio frames, and the orthogonal sequence of reference signal correspondence is OS simultaneously 2
The operation of subscriber equipment is as described below.At first subscriber equipment obtains slot timing by detecting primary synchronization channel.Subscriber equipment detects secondary synchronization channel and obtains cell group sign (and number of the downlink antenna that may transmit) then.Subscriber equipment obtains cell ID by reference signal detection again, and to detect orthogonal sequence be OS 2Subscriber equipment is OS according to orthogonal sequence 2The synchronous channel migration that can calculate the sub-district is skew S 2, promptly primary synchronization channel and secondary synchronization channel be in the 4th and the 14th slot transmission of radio frames, so subscriber equipment can obtain radio frames regularly.The information of main broadcast channel is read in subscriber equipment decoding then.
The 3rd embodiment:
In the present embodiment, synchronous channel migration is indicated in the base station in main broadcast channel.As shown in Figure 3, initialization system is supported 3 synchronous channel migrations: skew S 1, skew S 2And skew S 3
The operation of base station is as described below.Setting is according to the network planning, and the synchronous channel migration of sub-district is skew S 2, then the base station is in the 4th and the 14th slot transmission primary synchronization channel and secondary synchronization channel of radio frames, and synchronous channel migration is indicated with 2 bit informations in the base station in main broadcast channel.Set bit " 00 " indication skew S 1, bit " 01 " indication skew S 2, bit " 10 " indication skew S 3Then the base station is offset S with bit " 01 " indication in main broadcast channel 2
The operation of subscriber equipment is as described below.At first subscriber equipment obtains slot timing by detecting primary synchronization channel.Subscriber equipment detects secondary synchronization channel and obtains cell group sign (and number of the downlink antenna that may transmit) then.Subscriber equipment obtains cell ID by reference signal detection again.The information of main broadcast channel is read in subscriber equipment decoding then, is " 01 " according to the value of indicating the synchronous channel migration value, can know that the synchronous channel migration of sub-district is skew S 2, promptly primary synchronization channel and secondary synchronization channel be in the 4th and the 14th slot transmission of radio frames, so subscriber equipment can obtain radio frames regularly.

Claims (26)

  1. In the wireless communication system in cell search process the method for indication synchronous channel migration, comprise step:
    A) twice primary synchronization channel and secondary synchronization channel are transmitted in the base station in each radio frames, and the Primary Synchronisation Code that transmits in the described primary synchronization channel is identical in whole network;
    B) base station indication synchronous channel migration, described synchronous channel migration is meant the skew in radio frames of primary synchronization channel and secondary synchronization channel.
  2. 2. method according to claim 1 is characterized in that in step a), and described primary synchronization channel transmits in identical time slot with secondary synchronization channel.
  3. 3. method according to claim 1 is characterized in that in step b), and the skew in radio frames of described primary synchronization channel and secondary synchronization channel is meant primary synchronization channel and the secondary synchronization channel slot offset in radio frames.
  4. 4. method according to claim 3, when it is characterized in that 2M time slot arranged in each radio frames, 1 primary synchronization channel of every M slot transmission and secondary synchronization channel, wherein, M＞0.
  5. 5. method according to claim 4 when it is characterized in that 2M time slot arranged, disposes N deviant in each radio frames, wherein, and M＞0,2≤N≤M.
  6. 6. method according to claim 1 is characterized in that in step b), and described base station indication synchronous channel migration is meant that the base station indicates deviant in secondary synchronization channel.
  7. 7. method according to claim 1 is characterized in that in step b), and described base station indication synchronous channel migration is meant that the base station indicates deviant in reference signal.
  8. 8. method according to claim 1 is characterized in that in step b), and described base station indication synchronous channel migration is meant that the base station indicates synchronous channel migration in main broadcast channel.
  9. 9. method according to claim 6 is characterized in that deviant indication separately in secondary synchronization channel.
  10. 10. method according to claim 6 is characterized in that by cell group sign indication synchronous channel migration.
  11. 11. method according to claim 10 is characterized in that when synchronizing channel N different deviant S being arranged 1, S 2... .S N, and P cell group sign G arranged 1, G 2..., G PThe time, definition
    Figure A2007100045550002C1
    Skew S 1Pairing cell group sign is G 1To G Z, skew S 2Pairing cell group sign is G Z+1To G 2Z..., skew S i(i＜N) pairing cell group sign is G (i-1) Z+1To G IZ..., skew S NPairing cell group sign is G (N-1) Z+1To G P
  12. 12. method according to claim 7 is characterized in that the orthogonal sequence indication synchronous channel migration of base station in the reference signal.
  13. 13. method according to claim 12 is characterized in that orthogonal sequence and synchronous channel migration are to concern one to one.That is orthogonal sequence OS, 1Corresponding to skew S 1, orthogonal sequence OS 2Corresponding to skew S 2, and orthogonal sequence OS 3Corresponding to skew S 3
  14. 14. method according to claim 7 is characterized in that the base station indicates synchronous channel migration by cell ID.
  15. 15. method according to claim 14 is characterized in that when synchronizing channel N different deviant S being arranged 1, S 2... .S N, and Q cell group sign C arranged 1, C 2..., C QThe time, definition
    Figure A2007100045550003C1
    Skew S 1Pairing cell ID is C 1To C Y, skew S 2Pairing cell ID is C Y+1To C 2Y..., skew S i(i＜N) pairing cell ID is C (i-1) Y+1To C IY..., skew S NPairing cell ID is C (N-1) Y+1To C Q
  16. 16. a subscriber equipment carries out the method for Cell searching, comprises step:
    A) subscriber equipment obtains slot timing by detecting primary synchronization channel;
    B) subscriber equipment obtains radio frames timing, cell group sign and synchronous channel migration by detecting secondary synchronization channel;
    C) subscriber equipment obtains cell ID by reference signal detection;
    D) information of main broadcast channel is read in subscriber equipment decoding.
  17. 17. method according to claim 16 is characterized in that the subscriber equipment of described step b) directly reads deviant from secondary synchronization channel when indicate deviant separately the base station in secondary synchronization channel.
  18. 18. method according to claim 16, when it is characterized in that the cell group sign of transmitting when the base station is indicated synchronous channel migration in secondary synchronization channel, the subscriber equipment of described step b) obtains deviant from the cell group sign.
  19. 19. a subscriber equipment carries out the method for Cell searching, comprises step:
    A) subscriber equipment obtains slot timing by detecting primary synchronization channel;
    B) subscriber equipment obtains the cell group sign by detecting secondary synchronization channel;
    C) subscriber equipment obtains cell ID by reference signal detection, synchronous channel migration, and radio frames is regularly;
    D) information of main broadcast channel is read in subscriber equipment decoding.
  20. 20. method according to claim 19 is characterized in that the subscriber equipment of described step c) obtains synchronous channel migration according to orthogonal sequence in the reference signal when synchronous channel migration is indicated with the orthogonal sequence in the reference signal in the base station.
  21. 21. method according to claim 19 is characterized in that the subscriber equipment of described step c) obtains deviant from cell ID when synchronous channel migration is indicated by cell ID in the base station.
  22. 22. a subscriber equipment carries out the method for Cell searching, comprises step:
    A) subscriber equipment obtains slot timing by detecting primary synchronization channel;
    B) subscriber equipment obtains the cell group sign by detecting secondary synchronization channel;
    C) the subscriber equipment reference signal detection obtains cell ID;
    D) subscriber equipment is deciphered the information that main broadcast channel reads synchronous channel migration and other broadcast channel, and obtains radio frames regularly.
  23. 23. the emission synchronizing channel in the wireless communication system and the base station equipment of main broadcast channel comprise radiating portion, also comprise:
    Synchronizing channel and main broadcast channel control module, be used for according to the synchronous channel migration value that the network planning is determined determine how to transmit primary synchronization channel, secondary synchronization channel and main broadcast channel;
    Described emitter is transmitted into primary synchronization channel, secondary synchronization channel and main broadcast channel in the wireless channel.
  24. 24. the subscriber equipment that carries out Cell searching in the wireless communication system comprises receiving unit, also comprises:
    The physical channel demodulation multiplexer is used for going out primary synchronization channel, secondary synchronization channel, reference signal, main broadcast channel and other physical channels from the received signal demultiplexing;
    The Cell searching control module is used for obtaining the synchronous channel migration value and obtaining radio frames thus regularly from secondary synchronization channel.
  25. 25. the subscriber equipment that carries out Cell searching in the wireless communication system comprises receiving unit, also comprises:
    The physical channel demodulation multiplexer is used for going out primary synchronization channel, secondary synchronization channel, reference signal, main broadcast channel and other physical channels from the received signal demultiplexing;
    The Cell searching control module is used for obtaining the synchronous channel migration value and obtaining radio frames thus regularly from reference signal.
  26. 26. the subscriber equipment that carries out Cell searching in the wireless communication system comprises receiving unit, also comprises:
    The physical channel demodulation multiplexer is used for going out primary synchronization channel, secondary synchronization channel, reference signal, main broadcast channel and other physical channels from the received signal demultiplexing;
    The Cell searching control module is used for obtaining the synchronous channel migration value and obtaining radio frames thus regularly from main broadcast channel.
CNA2007100045553A 2007-01-10 2007-01-10 Device and method for indicating synchronous channel migration in subdistrict searching Pending CN101222269A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108235435A (en) * 2016-12-15 2018-06-29 华为技术有限公司 A kind of resource indicating method and device
CN108347327A (en) * 2017-01-25 2018-07-31 三星电子株式会社 Method and apparatus for detecting synchronizing signal in a wireless communication system
WO2018165986A1 (en) * 2017-03-17 2018-09-20 Oppo广东移动通信有限公司 Method for detecting synchronization signal block, and method, apparatus and system for transmitting synchronization signal block
CN109309554A (en) * 2017-07-27 2019-02-05 华为技术有限公司 Communication means and communication equipment
CN113711678A (en) * 2019-04-02 2021-11-26 瑞典爱立信有限公司 Network node, User Equipment (UE) and related method for scheduling UE by network node

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108235435A (en) * 2016-12-15 2018-06-29 华为技术有限公司 A kind of resource indicating method and device
CN108347327A (en) * 2017-01-25 2018-07-31 三星电子株式会社 Method and apparatus for detecting synchronizing signal in a wireless communication system
CN108347327B (en) * 2017-01-25 2022-04-05 三星电子株式会社 Method and apparatus for detecting synchronization signal in wireless communication system
WO2018165986A1 (en) * 2017-03-17 2018-09-20 Oppo广东移动通信有限公司 Method for detecting synchronization signal block, and method, apparatus and system for transmitting synchronization signal block
US10880031B2 (en) 2017-03-17 2020-12-29 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Method for detecting synchronization signal block, and method, apparatus and system for transmitting synchronization signal block
CN109309554A (en) * 2017-07-27 2019-02-05 华为技术有限公司 Communication means and communication equipment
CN109309554B (en) * 2017-07-27 2022-01-14 华为技术有限公司 Communication method and communication device
CN113711678A (en) * 2019-04-02 2021-11-26 瑞典爱立信有限公司 Network node, User Equipment (UE) and related method for scheduling UE by network node
US11917635B2 (en) 2019-04-02 2024-02-27 Telefonaktiebolaget Lm Ericsson (Publ) Network node, user equipment (UE), and associated methods for scheduling of the UE by the network node

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