CN101202585B - Radio communication base station, terminal and method for obtaining system information - Google Patents
Radio communication base station, terminal and method for obtaining system information Download PDFInfo
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Abstract
The invention provides an information acquiring method for a mobile communicating terminal which includes searching a synchronous sequence signal transmitted by a base station in a downlink synchronous time slot to build a down synchronization; ensuring the location of the broadcasting channel of the base station corresponding to a synchronous sequence signal in a time domain and a frequency domain; receiving the wireless signal transmitted by the broadcasting channel of the base station according to the ensured location to acquire the system information. The invention also provides a terminal and a wireless communicating base station device which adopt the method. The method of the invention acquires a system broadcasting channel and a sub-carrier cluster location that bears the broadcasting channel through identifying the synchronous sequence and can ensure the terminal to quickly and effectively acquire the system information and shorten the time to be accessed into the system. The method can effectively solve the same frequency common-channel interference problem between neighboring synchronous channels and broadcasting channels in a mobile communicating system and is suitable to be adopted in the future broad band mobile communicating system.
Description
Technical field
The present invention relates to mobile communication system, especially the base station in the wide-band mobile communication system, terminal and terminal are obtained the method for the system broadcast information of mobile communication system.
Background technology
In the existing second generation and 3-G (Generation Three mobile communication system), the bandwidth of system is all narrow, bandwidth as typical gsm mobile communication system has only 200kHz, belongs to the WCDMA mobile communication system of UMTS 3G (Third Generation) Moblie standard and the bandwidth of TD-SCDMA mobile communication system and is respectively 5MHz and 1.6MHz.Because the restriction of bandwidth, although developed multiple-input, multiple-output (MIMO) antenna technology and Adaptive Modulation and Coding (AMC) technology that can significantly improve the availability of frequency spectrum at present, but still can't satisfy to the mobile subscriber demand up to tens Mbps transmission rate communication capacities is provided.At present in Long Term Evolution (LTE) system that third generation partner program (3GPP) is promoted, by adopting OFDM (OFDM) modulation technique and up to the system bandwidth of 20MHz, can improve the transmission rate of air interface significantly, yet, above-mentioned LTE system and insert the WiMAX system propose etc. for satisfying high-speed radio, all also do not reach the following wide-band mobile communication system demand that International Telecommunication Union proposes, this following wide-band mobile communication system that is referred to as IMT-Advanced requires system can support system bandwidth up to 100MHz, and maximum transmission rate request reaches 1Gbps.
In the following wide-band mobile communication system demand of IMT-Advanced, consider existing radio band and the wireless frequency spectrum that may distribute in the future, its system bandwidth may be discontinuous, therefore require system equipment can support the system bandwidth of different brackets, for example except maximum system bandwidth is 100MHz, also need system can support the bandwidth demand of different brackets such as 5MHz, 10MHz, 20MHz, 40MHz, 80MHz, distributed the characteristics of frequency range to satisfy.Because existing mobile communications system all is based on the design than narrow bandwidth, and do not consider that same system need support the system configuration of different bandwidth, therefore existing related techniques can not guarantee that following wide-band mobile communication system should satisfy mobile phone users connecting system apace, avoids between the different districts synchronizing channel and the interference problem between broadcast channel again.
Summary of the invention
The invention provides a kind of system that is suitable for following wide-band mobile communication demand, comprise by have the radio communication base station of supporting variable tiered band width and the mobile communication system that terminal is formed and in this system the method for support terminal fast acquiring system broadcast message, technical scheme of the present invention can solve between the different districts synchronizing channel that exists in the existing mobile communication system and the interference problem between broadcast channel.
Technical scheme of the present invention is as follows:
A kind of method of obtaining system information may further comprise the steps:
The synchronization sequence signals that search base station sends in downlink synchronization slot is set up down-going synchronous;
The broadcast channel of determining described base station on time domain and frequency domain with respect to the position of synchronization sequence signals;
Receive described base station at the wireless signal that broadcast channel sends according to the position of determining, obtain system information.
Wherein, described broadcast channel specifically obtains the radio frames timing relationship by the identification synchronizing sequence with respect to the position of synchronizing sequence and obtains on time domain, described broadcast channel specifically is being to obtain the occupied frequency sub-band of the broadcast channel set up in advance and the relativeness between frequency sub-band width and occupied frequency sub-band of synchronizing sequence and the frequency sub-band width obtains by the identification synchronizing sequence with respect to the position of synchronizing sequence on the frequency domain.
Wherein, the synchronizing sequence that sends in downlink synchronization slot of described search base station is included in the enterprising line search of predefined experimental process frequency range.
Wherein, described base station has predetermined working frequency range width, this working frequency range width is a kind of in predefined a series of classification bin width, when described working frequency range width only can be divided into a frequency sub-band, a plurality of downlink synchronization slots are set in described radio frames, in a cell cluster that comprises the number of cells that equates with set downlink synchronization slot quantity in the described radio frames, the synchronizing sequence that the base station sends in each sub-district occupies different downlink synchronization slots respectively.When this working frequency range width is divided into more than a continuous frequency sub-band, be sent out on the described synchronizing sequence frequency sub-band therein, in a cell cluster that comprises the number of cells that equates with the frequency sub-band quantity that is marked off, the synchronizing sequence that the base station sends in each sub-district occupies different frequency sub-band respectively.Wherein, described sub-district can be the sectorized cells that different coverages are provided by same base station, and cell cluster can be made up of same sector of base station sub-district.
Wherein, described broadcast channel is with OFDM modulation system bearing system information, and described broadcast channel position with respect to synchronizing sequence on frequency domain further comprises by the employed cluster of subcarriers of identification synchronizing sequence acquisition broadcast channel.Wherein, the cluster of subcarriers of described bearing system information is made up of the subcarrier of uniformly-spaced arranging on the occupied frequency range of broadcast channel.In a cell cluster that continuous covering is provided, the cluster of subcarriers of different districts bearing system information can be set to have different sub-carrier offset.Set up corresponding relation between different sub-carrier offset and the synchronizing sequence in advance, terminal is by detecting the skew number that synchronizing sequence obtains the cluster of subcarriers of sub-district bearing system information.
Above-mentioned technical characterictic has guaranteed that terminal can directly obtain position of broadcast channel by sync-sequence search fast and identification, has guaranteed that terminal obtains the rapidity of system information, thereby has shortened the time of terminal connecting system.
Terminal of the present invention comprises following functional unit:
Be used for the synchronization sequence signals that search base station sends, set up the synchronizing sequence capturing unit of down-going synchronous; The broadcast channel that is used for determining described base station on time domain and frequency domain with respect to the broadcast channel position determination unit of the position of synchronizing sequence; Be used for receiving wireless signal that the base station sends at broadcast channel and the system information acquiring unit that obtains system information according to the radio frames timing relationship.Wherein, described terminal obtains the radio frames timing relationship by the identification synchronizing sequence and obtains broadcast channel position with respect to synchronizing sequence on time domain, obtains the occupied frequency sub-band of the broadcast channel set up in advance and the relativeness between frequency sub-band width and occupied frequency sub-band of synchronizing sequence and the frequency sub-band width obtains broadcast channel position with respect to synchronizing sequence on frequency domain by the identification synchronizing sequence.Described terminal also comprises the functional unit that is used for being supported in the synchronizing sequence that search base station on the predefined experimental process frequency range sends at downlink synchronization slot.
Radio communication base station of the present invention comprises following functional unit:
Be used to produce the timing control unit of timing control signal with predetermined radio frames timing relationship; Be used for sending at downlink synchronization slot the synchronizing sequence transmitting element of synchronization sequence signals according to described radio frames timing relationship; Be used for sending at the residing time slot of broadcast channel the system information transmitting element of the wireless signal of bearing system information according to described radio frames timing relationship.Wherein, the synchronizing sequence of each sub-district of a cell cluster that covers continuously of composition is configured to discern uniquely and sends in transmission on the different frequency sub-band or the different downlink synchronization slots in radio frames.
Description of drawings
Fig. 1 is typical mobile communication system schematic diagram;
Fig. 2 is first kind of frame structure schematic diagram of the present invention;
Fig. 3 is that DST time slot frequency domain frequency sub-band of the present invention (or claiming subband) is divided schematic diagram;
Fig. 4 is second kind of frame structure schematic diagram of the present invention;
Fig. 5 is a broadcast channel subcarrier allocation schematic diagram of the present invention;
Fig. 6 obtains the schematic flow sheet of system information for terminal of the present invention;
Fig. 7 is radio communication base station of the present invention and terminal schematic diagram;
Embodiment
Obtain the method for system information and adopt the terminal and the wireless base station device of the inventive method to be elaborated of the present invention below in conjunction with accompanying drawing.
The structure of common mobile communication system as shown in Figure 1, this mobile communication system is made up of some radio communication base stations, these base stations have one or several have certain coverage the sub-district or be the sector, these sub-districts form the zone of continuous covering when the network planning, to guarantee can to provide enough good radio signal quality in whole planning region.In the network environment of reality, the shape of each coverage cell and the position of wireless base station all are irregular, generally speaking, need be in forming a cell cluster that covers continuously, each sub-district all sends a unique signal that can be moved terminal recognition, this signal is used for the synchronized relation of terminal searching proper cell and foundation and this sub-district, could guarantee terminal connecting system effectively like this.
Satisfying the radio communication base station of IMT-advanced demand may needs provide the sub-district to cover with the system bandwidth of the wide 100MHz of reaching, or carry out the sub-district with the form that the classification bandwidth varying can be provided and cover, wireless base station of the present invention can not limit provides the concrete form that satisfies such bandwidth, for example can take base station design to satisfying the highest bandwidth requirement, transmit and only in the band limits of needs, produce in use, or according to the needs of the networking network planning sender assembly that respective bandwidth requires is only satisfied in apolegamy, the latter has lower realization cost usually.For the ease of the terminal searching cell signal, wireless base station of the present invention need be divided into some time slots by certain frame structure requirement to the signal that wave point sends, and this communication system can be referred to as the wireless communication system of time slotization again.Described frame structure has as accompanying drawing 2 or similar feature, and for example, a time slot in the radio frames is called as pilot time slot or synchronization slot, sends the synchronizing signal that is used for the terminal searching sub-district, DST time slot as shown in FIG. in this time slot; And be arranged as time slot at another time slot, in this time slot, send the broadcast channel signal of bearing system broadcast message, broadcast channel does not need to take all resources of this time slot, this sub-district and adjacent on every side sub-district are not being produced under the more strongly disturbing situation, these residual resource also can be used for carrying the transmission of traffic channel data for example etc.; These business time-slots except that DST, it is identical with the bandwidth of system frequency range that its maximum bandwidth that sends information is configured to, and as in the system of 5MHz bandwidth, the maximum bandwidth that business time-slot sends is 5MHz, and in the system of 100MHz, the maximum bandwidth that business time-slot sends is 100MHz.
The synchronizing sequence that wireless base station of the present invention is sent at the DST time slot, its signal bandwidth are restricted to can be by a bin width of system bandwidth institute aliquot, for example 5MHz or 10MHz.For a broadband wireless system, if adopt the deployment way of Cellular Networks, owing to there is bigger interference between neighbor cell, and these disturb for terminal carry out the measurement of DST signal and synchronously and broadcast channel (Broadcast channel, BCH) influence of Jie Shouing very greatly.Therefore in the design of system of broadband wireless communication, require careful consideration and reduce these interference, thus user's quick access and switching in the realization system.
The following mode that adopts at wireless base station of the present invention reduces the method for designing of downlink synchronous signal and the mutual interference of broadcast channel phase between adjacent cells: the bandwidth of the downlink synchronous sequence signal that the DST time slot among Fig. 2 sends is relevant with the bandwidth of system.When system bandwidth during greater than bandwidth W1, it sends bandwidth is W1, and W1 can be divided exactly by all system bandwidths greater than it.Because the signal bandwidth that the DST time slot sends is less than system bandwidth, and taken a time slot, the subband that then can be divided into a plurality of bandwidth and be W1 on the frequency domain of DST time slot is wide, as the example of accompanying drawing 3.In Fig. 3, we suppose that W1 is the 10MHz bandwidth, and in the system of a 40MHz bandwidth, the DST time slot can be divided into the bandwidth of 4 10Mhz on frequency domain.In the network planning, constitute each sub-district in the cell cluster that covers continuously and be configured to subband transmission downlink synchronous sequences different in Fig. 3, like this, different districts in the cell cluster sends synchronizing sequence owing to taken different subbands, the frequency division multiplexing that on frequency domain, the descending targeting sequencing of different districts is carried out, it is quadrature on the DST time slot that neighbor cell sends signal, therefore can avoid the interference between synchronizing signal.Typically, if the base station in the overlay area has 3 sectors, need then to guarantee that the synchronizing sequence of these 3 sectors transmissions is on different frequency sub-band.
Be equal to or less than when system bandwidth under the situation of W1, because the signal bandwidth of the downlink synchronous sequence that the DST time slot sends equals system bandwidth, therefore, the minizone can't adopt frequency domain to divide the interference avoidance method that different subband modes realizes the frequency domain multiplexing mode.In order to address this problem, wireless base station of the present invention adopts the frame structure that a plurality of downlink synchronization slots are set in radio frames, 3 descending pilot frequency time slots such as example DST1, DST2, DST3 as shown in Figure 4, each sub-district in the cell cluster is configured to respectively send synchronizing sequence at different downlink synchronization slots, do not repeat owing to temporal like this, the downlink synchronous signal that can reduce between the different districts in the adjacent cell cluster disturbs.
This shows, in order to make the wireless base station can be adapted to above these situations, need pre-defined one or more frame structure forms, need corresponding timing control unit in the base station, can produce the timing control signal that is consistent with the frame structure of selected configuration, so that the control base station sends or receive wireless signal according to predetermined wireless frame structure.
Simultaneously, the interference of broadcast singal also needs to solve between neighbor cell.Always comprise the required minimal network configuration information of knowing of accessing terminal to network for broadcast channel.Have only terminal intactly to receive the system broadcast information of network, the awareness network configuration state could access network, and communicates process thereafter.
As a kind of optional embodiment, broadcast channel the middle part of being made an appointment for the system bandwidth that is positioned at a base station configuration.The transmission bandwidth of supposing broadcast channel is W2, and the system bandwidth of sub-district is Ws, and then broadcast channel is positioned at [(Ws-W2]/2, (Ws+W2)/2 in] the band limits.In addition, for fear of interference, broadcast channel adopts the distributed resource configuration mode, the OFDM subcarrier that promptly sends certain CBCH is not continuous, but arranged spaced equably forms a distributed cluster of subcarriers, only carries broadcast channel on this distributed cluster of subcarriers.For example: suppose that the subcarrier spacing that broadcasting is adopted is n, what then exist between the subcarrier for the broadcast channel configuration is spaced apart n, and subcarrier of distribution is used for transmitting system and broadcasts in every n+1 subcarrier.It is 2 diagram that accompanying drawing 5 has provided subcarrier spacing, in the drawings, has a system broadcast information that is used for this sub-district send in per 3 subcarriers.
The residing time slot of broadcast channel is arranged in the time slot position that frame structure is made an appointment, and therefore, when terminal searching arrives synchronizing sequence, after the down-going synchronous relation of foundation and sub-district, just can know the time slot position of this broadcast channel by the radio frames timing relationship.Because broadcast channel need omnidirectional send in the coverage of sub-district, like this can be more approaching in the signal strength signal intensity of intersection area, the edge of two sub-districts different districts, therefore might form stronger interference.For tackling this kind interference, in a cell cluster that covers continuously, the broadcast channel that each sub-district can be provided with when the network planning carries on the cluster of subcarriers of different sub carrier skew, so just guaranteed that the broadcast channel between the different districts is orthogonal in the cell cluster, its interference of the broadcast channel of She Zhiing will be mainly derived from the broadcast channel that cell cluster has same sub-carrier offset outward like this, therefore disturb to be subjected to inhibition.Typically, broadcast channel at its each sector, base station of one 3 sector can adopt different sub-carrier offset, or adopt the cell cluster of other common form such as 4 sub-districts or 7 sub-districts according to the needs of networking, the prerequisite here is the abundant side-play amount of need making an appointment, but this does not influence the enforcement of technical solution of the present invention.Other subcarrier between the broadcast channel subcarrier of each sub-district also can carry out transfer of data as other channel under certain conditions.
When terminal searched synchronizing sequence on specific frequency sub-band, in order to know broadcast channel bandwidth and frequency range thereof the position with respect to synchronization sequence signals exactly, this corresponding relation of just need making an appointment obtained.In addition, if comprise a plurality of synchronization slots in the frame structure, need equally also which uses maybe can be in which synchronizing sequence one by fixing on approximately in which synchronization slot.Equally, for the different sub-carrier offset of broadcast channel, also be the corresponding relation with synchronizing sequence of to make an appointment.Like this, in a cell cluster, synchronizing sequence can be discerned the relative position of broadcast channel frequency range and synchronization sequence signals frequency range or synchronizing sequence corresponding synchronization slot or the side-play amount of broadcast channel subcarrier in frame structure uniquely, or can discern the combination of these several corresponding relations uniquely.
Synchronizing sequence of the present invention can be not limited to and adopt the CAZAC sequence be similar in existing TD-SCDMA system downlink pilot sign indicating number sequence or the LTE system etc., the selecting for use of this synchronizing sequence generally should be convenient to terminal and discern by the correlation technique of time domain or frequency domain, also can be signal that has specific time-domain signal power envelope feature etc.In correlation technique, terminal is by carrying out relevantly determining it is which synchronizing sequence with all sequences of storage in advance.These technology are known to one skilled in the art, thereby do not need too much to give unnecessary details.
Wireless base station of the present invention also is not limited to Frequency Division Duplexing (FDD) or tdd systems simultaneously, for example in the frame structure of Fig. 2 fully as required some business time-slots be set to descending time slot, and other business time-slots are ascending time slot, only need satisfy the interval condition of changing between the uplink and downlink timeslot and get final product, and these information can be known by terminal by system broadcasts speech breath.
As shown in Figure 6, the terminal of the present invention specific embodiment that obtains the system broadcast information method may further comprise the steps:
The synchronization sequence signals that step 601, search base station send in downlink synchronization slot is set up down-going synchronous.
Terminal need be searched for synchronization sequence signals on predetermined frequency sub-band, usually terminal needs a signal that search on the different frequency sub-band is obtained to compare the process of judgement, and therefrom select a synchronization sequence signals the strongest, for the reliability that guarantees to search for, may need to handle by received signal to continuous several radio frames.
When terminal searching and after having discerned synchronizing sequence, just determined the synchronized relation of terminal and cell downlink signal, determined the position of radio frames.This moment terminal further according to canned data in advance know broadcast channel on the time domain and on the frequency domain with respect to the position of synchronizing sequence.Broadcast channel can obtain the radio frames timing relationship by the identification synchronizing sequence with respect to the position of synchronizing sequence and obtain on time domain, broadcast channel can obtain the occupied frequency sub-band of the broadcast channel set up in advance and the relativeness between frequency sub-band width and occupied frequency sub-band of synchronizing sequence and the frequency sub-band width obtains by the identification synchronizing sequence with respect to the position of synchronizing sequence on the frequency domain.Further, terminal can also be determined the employed cluster of subcarriers of broadcast channel by synchronizing sequence.
Terminal will be mapped in the signal extraction of transmitting on the broadcast channel cluster of subcarriers and come out, and carry out demodulating system information after the operations such as channel decoding.
As shown in Figure 7, terminal of the present invention and radio communication base station device have been provided, terminal installation wherein comprises: synchronizing sequence capturing unit 701, be used for the synchronization sequence signals that search base station sends, set up down-going synchronous, this functional unit has the function that is supported in the synchronizing sequence that search base station sends on the predefined experimental process frequency range in downlink synchronization slot; Broadcast channel position determination unit 702, the broadcast channel that is used for determining described base station on time domain and frequency domain with respect to the broadcast channel position determination unit of the position of synchronizing sequence; System information acquiring unit 703 is used for receiving the wireless signal that the base station sends at broadcast channel and obtaining system information according to the radio frames timing relationship.In addition, also comprise memory cell 704 in the terminal, be used to store in advance occupied frequency sub-band of the broadcast channel set up and the relativeness information between bin width and occupied frequency sub-band of synchronizing sequence and the frequency sub-band width.
Radio communication base station device wherein comprises: timing control unit 706 is used to produce the timing control signal with predetermined radio frames timing relationship; Synchronizing sequence transmitting element 707 is used for sending synchronization sequence signals according to described radio frames timing relationship at downlink synchronization slot; System information transmitting element 708 is used for according to the system information transmitting element of described radio frames timing relationship at the wireless signal of the residing time slot transmission of broadcast channel bearing system information.In addition, also comprise memory cell 709, be used to store in advance occupied frequency sub-band of the broadcast channel set up and the relativeness information between frequency sub-band width and occupied frequency sub-band of synchronizing sequence and the frequency sub-band width, with synchronization sequence signals generation unit 710, be used to produce synchronization sequence signals.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (19)
1. a method of obtaining system information is characterized in that, may further comprise the steps:
The synchronization sequence signals that search base station sends in downlink synchronization slot is set up down-going synchronous;
The broadcast channel of determining described base station on time domain and frequency domain with respect to the position of synchronization sequence signals, wherein, described broadcast channel specifically is being to obtain the occupied frequency sub-band of the broadcast channel set up in advance and the relativeness between frequency sub-band width and occupied frequency sub-band of synchronizing sequence and the frequency sub-band width obtains by the identification synchronizing sequence with respect to the position of synchronizing sequence on the frequency domain;
Receive described base station at the wireless signal that broadcast channel sends according to the position of determining, obtain system information.
2. the method for obtaining system information as claimed in claim 1 is characterized in that, described broadcast channel position with respect to synchronizing sequence on time domain specifically obtains by identification synchronizing sequence acquisition radio frames timing relationship.
3. the method for obtaining system information as claimed in claim 1 is characterized in that, the synchronizing sequence that described search base station sends in downlink synchronization slot is included in the enterprising line search of predefined several frequency ranges.
4. the method for obtaining system information as claimed in claim 1, it is characterized in that, described broadcast channel is with OFDM modulation system bearing system information, and described broadcast channel position with respect to synchronizing sequence on frequency domain further comprises by the employed cluster of subcarriers of identification synchronizing sequence acquisition broadcast channel.
5. the method for obtaining system information as claimed in claim 1, it is characterized in that, described base station has predetermined working frequency range width, and this working frequency range width is divided at least one continuous frequency sub-band, is sent out on the described synchronizing sequence frequency sub-band therein.
6. the method for obtaining system information as claimed in claim 5 is characterized in that, in a cell cluster that comprises the number of cells that equates with the frequency sub-band quantity that is marked off, the synchronizing sequence that the base station sends in each sub-district occupies different frequency sub-band respectively.
7. the method for obtaining system information as claimed in claim 6 is characterized in that, described sub-district is the sectorized cells that different coverages are provided by same base station.
8. the method for obtaining system information as claimed in claim 5 is characterized in that, described predetermined working frequency range width is a kind of in predefined a series of classification bin width.
9. the method for obtaining system information as claimed in claim 5, it is characterized in that, when described working frequency range width only can be divided into a frequency sub-band, a plurality of downlink synchronization slots are set in described radio frames, in a cell cluster that comprises the number of cells that equates with set downlink synchronization slot quantity in the described radio frames, the synchronizing sequence that the base station sends in each sub-district occupies different downlink synchronization slots respectively.
10. the method for obtaining system information as claimed in claim 9 is characterized in that, described cell cluster is by providing the sectorized cells of different coverages to form by same base station.
11. the method for obtaining system information as claimed in claim 4 is characterized in that, the cluster of subcarriers of described bearing system information is the subcarrier of uniformly-spaced arranging on the occupied frequency sub-band of broadcast channel.
12. the method for obtaining system information as claimed in claim 11 is characterized in that, in a cell cluster that continuous covering is provided, the cluster of subcarriers of different districts bearing system information has different sub-carrier offset.
13. the method for obtaining system information as claimed in claim 11 is characterized in that, sets up the corresponding relation of cluster of subcarriers skew number and synchronizing sequence in advance, terminal is by detecting the skew number that synchronizing sequence obtains the cluster of subcarriers of sub-district bearing system information.
14. a terminal communicates by wireless signal with the base station, it is characterized in that, comprises following functional unit:
The synchronizing sequence capturing unit is used for the synchronizing sequence that search base station sends, and sets up down-going synchronous;
Broadcast channel position determination unit, the broadcast channel that is used for determining described base station on time domain and frequency domain with respect to the position of synchronizing sequence;
The system information acquiring unit is used for receiving the wireless signal that the base station sends at broadcast channel according to the radio frames timing relationship, and obtains system information;
Wherein, described terminal obtains the occupied frequency sub-band of the broadcast channel set up in advance by the identification synchronizing sequence and the relativeness between frequency sub-band width and occupied frequency sub-band of synchronizing sequence and the frequency sub-band width obtains broadcast channel position with respect to synchronizing sequence on frequency domain.
15. terminal as claimed in claim 14 is characterized in that, described terminal obtains the radio frames timing relationship by the identification synchronizing sequence and obtains broadcast channel position with respect to synchronizing sequence on time domain.
16. terminal as claimed in claim 14 is characterized in that, the described terminal synchronizing sequence that search base station sends in downlink synchronization slot on predefined experimental process frequency range.
17. a wireless communication system comprises some base stations with one or more coverage cell, described base station communicates by wireless signal and terminal, it is characterized in that, described base station comprises following functional unit:
Timing control unit is used to produce the timing control signal with predetermined radio frames timing relationship;
The synchronizing sequence transmitting element is used for sending synchronizing sequence according to described radio frames timing relationship at downlink synchronization slot, the broadcast channel that described synchronizing sequence can be used for determining described base station on time domain and frequency domain with respect to the position of synchronizing sequence; Wherein, obtain occupied frequency sub-band of the broadcast channel set up in advance and the relativeness between frequency sub-band width and occupied frequency sub-band of synchronizing sequence and the frequency sub-band width by the identification synchronizing sequence, can access broadcast channel position with respect to synchronizing sequence on frequency domain;
The system information transmitting element is used for according to the wireless signal of described radio frames timing relationship in the residing time slot transmission of broadcast channel bearing system information.
18. wireless communication system as claimed in claim 17 is characterized in that, in a cell cluster that covers continuously, the synchronizing sequence of each sub-district can be discerned uniquely and be sent on different frequency sub-band.
19. wireless communication system as claimed in claim 17 is characterized in that, in a cell cluster that covers continuously, the synchronizing sequence of each sub-district can be discerned uniquely and the different downlink synchronization slots in radio frames in send.
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| CN101651988B (en) * | 2008-08-14 | 2013-08-14 | 华为技术有限公司 | System information acquiring method, communication system and mobile terminal |
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