CN102695226B - Mobile radio station and radio communication system - Google Patents
Mobile radio station and radio communication system Download PDFInfo
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- CN102695226B CN102695226B CN201210148734.5A CN201210148734A CN102695226B CN 102695226 B CN102695226 B CN 102695226B CN 201210148734 A CN201210148734 A CN 201210148734A CN 102695226 B CN102695226 B CN 102695226B
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Abstract
During switching among mobile radio stations, one mobile radio station receives information of a target mobile base station and relevant information of sequences used in random access signals supposed to be transmitted to the target mobile base station from a source mobile base station and receives synchronous channel signals transmitted from the target mobile base station. Therefore, the mobile radio station sets time from receiving set time of synchronous channels after a set time shifts and transmits random access signals of frequencies corresponding to the synchronous channels to the target mobile base station. In case of transmitting the random access signals during switching, places utilizing the set time/frequency during transmission are exclusively used by the random access signals transmitted from the mobile radio station or by multiple switching terminals at the same time, interference among random access signals from multiple mobile radio stations can be suppressed to zero or to be lowered, and accordingly, success receiving rate of the random access signals in switching target mobile base stations is increased, probability of retransmitting of the random access signals is reduced and as a result, switching time can be shortened.
Description
The application divides an application, and the application number of original bill application is 200680055955.0, and international application no is PCT/JP2006/319325, and the applying date is on September 28th, 2006, and denomination of invention is " radio communication device, base station and their control method ".
Technical field
The present invention relates to obtain when mobile terminal and base station the radio communication device that sends accidental access signal while synchronizeing.
Background technology
At the EUTRAN(Evolved UTRAN that carries out at present the system of future generation as 3GPP system of basic research) in, the switching of the minizone that the leap different base station occurring along with the movement of mobile terminal covers is respectively direct-cut operation.In direct-cut operation, cut off mobile terminal with mobile before after the connection of the base station of communicating by letter, connect the circuit of mobile terminal and mobile object base station.Direct-cut operation can obtain the system information of mobile object base station before being about to switch, and switched at short notice, but can there is user data in switching, transmitted the state interrupting.
In addition, in EUTRAN, the code using as the lead code portion of Frame, the most effectively use CAZAC(Constant Amplitude Zero Auto Correlation, permanent envelope zero auto-correlation) sequence, it is included in the accidental access signal sending between the radio zone of up link.As CAZAC sequence, there are Zadoff-Chu sequence, GCL sequence etc.Below, the formula representing as a kind of Zadoff-Chu sequence of CAZAC sequence is shown:
In above-mentioned formula, L is sequence length, and k is sequence index.Particularly, when length L is prime number length, this sequence has good autocorrelation performance and their cross correlation.
Fig. 1 is created on the block diagram of an example of circuit of the lead code portion of the accidental access signal using in the radio section up link of EUTRAN according to CAZAC sequence.
The CAZAC sequence of length M (L), after carrying out serial/parallel conversion, is imported in DFT portion 10, by the parallel signal that Fourier transform becomes and line number is M.This signal is imported in subcarrier mapping portion 11 and is mapped on N subcarrier.The sub-carrier signal that has shone upon CAZAC sequence is input to and in IFFT portion 12, carries out inverse fourier transform, and be input in parallel/serial converted portion 13.And the output signal of the line number IFFT portion 12 that is N is transformed to serial signal by walk abreast/serial converted portion 13, as random access lead code sequence, export.
And, suppose that system bandwidth in EUTRAN (transmission bandwidth that base station sends, receives between radio zone) is 20MHz to the maximum, to send the minimum bandwidth receiving be 10MHz to terminal at present.Terminal has the signal of 10MHz width is at least sent to the ability receiving.In addition, also suppose adjacent community, the different base station of system bandwidth is launched.In order to make terminal independently easily carry out search of initial zone and switching with system bandwidth, the synchronizing channel sending between the radio zone of down link and report signal channel (are transmitted to the channel of the information etc. of community, base station.Below, be expressed as reporting channel) be configured in the center of the transmission band of down link.But, when system transmission bandwidth is 20MHz, also to consider the problem of 2 to 3 positions placement synchronizing channels in transmission band.The problem that the mobile terminal that this is is 10MHz by existence transmission reception signal bandwidth is taken into account.
No matter in which kind of situation, all not necessarily in whole subframes, insert synchronizing channel and send, suppose that according to every 5,10 or 20 subframes, inserting synchronizing channel sends.
In EUTRAN, between the neighbor cell that different base station covers, switch to direct-cut operation, when certain mobile terminal starts to switch in the process of carrying out data transmission, for this terminal, in sending the transmission of the down link data of state, be interrupted, from the base station of ongoing communication, be sent to switching object base station.And, before finishing switching, in the buffer of base station side, need storage for the down link data of this mobile terminal, but along with the time of switching needs is elongated, the data volume that should put aside in buffer also increases.Similarly, when switching beginning, this mobile terminal should send to the uplink data of base station side and also end to send, and need to be stored in the buffer of mobile terminal side.In this case, in handoff procedure, likely certain data has been dropped, and the in the situation that of normal data, needs upper strata again to send.In addition, with HARQ(Hybrid Automatic Repeat reQuest, mixed automatic retransfer) for carrying out under the state of continuous data transmission on basis, when switching, also may produce and be given to successively the situation that the sequence number of continuous data is replaced.While switching in the voice call of packets of voice, the packets of voice that down link also can occur is sent to the situation of switching object base station and interrupting voice call.And, owing to being real-time voice communication, so all packets of voice that are transmitted are not necessarily used effectively in transmission destination.
In above situation, undesirable, the kind of data is no matter be common data or packets of voice, switches the needed time all very long.
In the process of switching, terminal need to catch the downlink Synchronization Channel sending from switching object base station, and after obtaining synchronously, sends accidental access signal in up link.After obtaining synchronously in down link, if can send rapidly accidental access signal, likely shorten and switch the needed time.
In addition, when using CAZAC sequence as the lead code portion of accidental access signal, even if the length L of the CAZAC sequence of using is identical, because the index k of sequence is different, the PAPR(Peak-to-average power ratio of lead code portion, peak-to-average power ratio) value is also different.
Fig. 2 is the figure of PAPR characteristic that the preamble signal of the bandwidth 5MHz that has used Zadoff-Chu sequence is shown.
The sequence length of the Zadoff-Chu sequence of using in Fig. 2 is fixed, and carries out various variations investigate PAPR by the index k to sequence.Can learn, the difference of PAPR value more than 3dB can occur according to index value.That is, the large sequence of PAPR, compares with average power, and its peak power is larger.
In order not make the signal waveform of lead code portion deform when mobile terminal sends lead code portion, use CAZAC sequence that PAPR value is larger as lead code, it is larger that rollback amount is exported in the transmission that the sending part power amplifier of mobile terminal needs.Conventionally, when increase rollback amount is moved amplifier, it is large that the consumed power of amplifier becomes.That is, for input power, the position that the input power of sending part power amplifier is little has linear amplification characteristic, and starts to become nonlinear characteristic near certain input power value that this amplification characteristic determines from amplifier, and magnification ratio is saturated and diminish.When using CAZAC sequence that PAPR is large to amplify as the signal of lead code, due to the average power of this signal and the difference of peak power larger, so when the position of average power of this signal of input is the part near the zone of saturation of the amplification characteristic of amplifier, the peak power of this signal is not carried out linearity and is amplified because amplification characteristic is saturated, cause signal skew.Therefore, for erasure signal distortion, make the average power signal step-down of input amplifier, when signal power reaches peak value, must make this power not arrive the saturated region of amplification characteristic of amplifier.In the amplification characteristic of amplifier, the point at the average power place of input power or power output is called to operating point, the reduction that the output saturation point from operating point is started is called rollback amount.
In non-patent literature, record the explanation relevant to EUTRAN.In addition, in non-patent literature 2, record the CAZAC sequence about Zadoff-Chu sequence etc.
Non-patent literature 1:3GPP TR25.814
Non-patent literature 2:3GPP TSG RAN1LTE Ad Hoc R1-061710
Summary of the invention
Problem of the present invention is to provide a kind of in carrying out the mobile communication system of direct-cut operation, and the time of the data instantaneous trip while as far as possible making to switch shortens, also effectively realizes the radio communication device of direct-cut operation.
During switching, because mobile terminal is positioned near cell edge, so that the transmitted power that the needed transmitted power of preamble signal that base station acceptance division success mobile terminal receive sends is greater than near the mobile terminal being positioned at base station while sending same preamble coded signal.And, from sending the needed transmitted power of lead code portion of accidental access signal near the cell edge of radius of society great community, be likely greater than the maximum possible transmitted power of this mobile terminal.
In addition, in the process of switching, terminal need to catch the downlink Synchronization Channel sending from switching object base station, after obtaining synchronously, sends accidental access signal in up link.If can promptly send accidental access signal after having obtained synchronously in down link, likely shorten and switch the needed time.At this, in the present invention, adopted a kind of radio communication device, its dividing frequency band by up link and down link becomes narrower frequency band distribute data, communicate wirelessly, it is characterized in that, this radio communication device has: synchronizing signal capture unit, and when receiving the notice that should switch, this synchronizing signal capture unit catches and switches the synchronizing signal that object base station sends; The synchronous signal transmitting unit of establishing, it starts after the stipulated time from capturing the timing of this synchronizing signal, use the frequency location in uplink band, will to this switching object base station, send for establishing with the establishment signal of synchronizeing of this switching object base station synchronization.
The relation of frequency location that sends synchronizing signal in preferred downlink frequency band is the same with the relation that sends the synchronous frequency location of establishing signal in uplink band.For example, the frequency location that sends synchronizing signal in downlink band during corresponding to centre frequency position, sends the synchronous signal of establishing in the centre frequency position of uplink band.And, for example, owing to being the signal (, the lead code of accidental access signal) sending from departing from the position of wireless base station, therefore suppressed to send the increase of the rollback amount of output.
At this, in the present invention, adopted a kind of mobile radio station, this mobile radio station receives and switches the synchronizing channel that object wireless base station sends, then via Random Access Channel, send accidental access signal, establish thus up-link wireless circuit, it is characterized in that, this mobile radio station has lead code generating unit, this lead code generating unit is restricted to the CAZAC sequence of regulation by the CAZAC sequence that is used as the lead code of described accidental access signal in the different a plurality of CAZAC sequences of index, and utilizes the CAZAC sequence of this restriction to generate the lead code of described accidental access signal.
Accompanying drawing explanation
Fig. 1 is created on the block diagram of an example of circuit of the lead code portion of the accidental access signal using in the radio section up link of EUTRAN according to CAZAC sequence.
Fig. 2 is the figure of PAPR characteristic that the preamble signal of the bandwidth 5MHz that uses Zadoff-Chu sequence is shown.
Fig. 3 is the figure of the 1st principle of explanation embodiment of the present invention.
Fig. 4 is the figure of the 2nd principle of explanation embodiment of the present invention.
Fig. 5 is the figure (its 1) that the order while switching according to embodiment of the present invention is shown.
Fig. 6 is the figure (its 2) that the order while switching according to embodiment of the present invention is shown.
Fig. 7 is the figure (its 3) that the order while switching according to embodiment of the present invention is shown.
Fig. 8 is the frame assumption diagram of the mobile terminal based on embodiment of the present invention.
The frame assumption diagram of moving source base station when Fig. 9 is the switching based on embodiment of the present invention.
The frame assumption diagram of mobile object base station when Figure 10 is the switching based on embodiment of the present invention.
Embodiment
In embodiments of the present invention, adopt following means.
1. timing and the frequency that can send for the base station (switching object base station) of mobile object community non-synchronous type accidental access signal when switching are made as: between the radio zone of the down link with mobile object community, send on the sub-band between the radio zone of up link of the corresponding mobile object community of the sub-band (frequency domain of the transmission synchronizing channel when the whole wireless transmission band using in radio communication is divided into several frequency band in divided frequency domain) of synchronizing channel, and from the timing of position skew stipulated time of the downlink Synchronization Channel of mobile object community (with this regularly in corresponding subframe).But the length of the lead code portion of non-synchronous type accidental access signal is different due to the size of community sometimes.For example, in great community, the lead code portion of non-synchronous type accidental access signal strides across a plurality of continuous subframes sometimes, and the transmission of non-synchronous type accidental access signal is started to be regularly made as the timing that is offset the identical stipulated time from the position of synchronizing channel.
In addition, during switching, from moving source base station to the mobile terminal notice information relevant to the length of the lead code portion of the non-synchronous type accidental access signal using mobile object community of switching.
In addition, time offset is unique to be determined, in whole communities of a mobile communication system, shares.Now, time offset both can be pre-stored in storage part by mobile terminal, also can be specified by handover source or object wireless base station.Therefore like this, if time offset is constant, even if base station does not stride across within a certain period of time whole communication band and searches from the accidental access signal of each mobile terminal passablely yet, can establish rapidly the circuit of base station and mobile radio station.
In addition, for mobile terminal, after synchronous establishment, according to the position of this synchronizing channel, can be at the determined timed sending accidental access signal of the shift time by stipulating (T).Therefore, compare with the situation that receives accidental access signal in unfixed timing, need not base station side because of consider this not stationarity guarantee buffer that needn't be so large.
For a synchronizing channel, can set the send opportunity (after T shift time) of an accidental access signal, but also can set repeatedly (for example twice).For example, for synchronizing channel, also can after shift time T, 2T, give the send opportunity of accidental access signal.When there is conflict in initial chance, also need not wait for that the transmission cycle of synchronizing channel just can access next chance.
In addition,, as the example of T, be preferably the transmission cycle being redefined for than synchronizing channel shorter, and, if T is set as below 5 subframes, particularly, be set as 3 to 4 subframes, can very appropriate seizure processing, these both sides of transmission processing that also carry out advantageously synchronizing channel.
2. when the other-end of non-switching state can not be used the switching shown in 1, can send timing and the frequency of accidental access signal.
That is the timing of the accidental access signal while, timing, the frequency of the other-end appointment transmission accidental access signal for non-switching state being made as to this switching and timing, the frequency beyond frequency.
Thus, can greatly reduce the collision probability of accidental access signal in mobile object (switching object) base station acceptance division, can shorten and switch the needed time.
3. when not there is not the terminal of just switching for the community of certain base station, the terminal when scheduler of this base station switches only having shown in 2 can be monopolized timing and the frequency of use, and the other-end of distributing in this community is about to the uplink signal use sending to this base station.For example, based on judging whether as got off, there is the terminal of switching, that is: according to the base station from neighbor cell or aGW(access Gate Way.Corresponding to the base-station control apparatus of WCDMA system) the relevant signaling of switching that sends (represents to switch the signaling starting, the information relevant to the terminal of switching object, requires to guarantee to switch the signaling etc. of the Radio Resource of the used for mobile terminal coming) and after finishing switching for direct (or indirectly) display terminal has finished and the control signal that sends etc. to the switching of switching object base station.
When not there is not the terminal that to be ready switching, can avoid because not using the reduction of the Radio Resource utilization ratio that Radio Resource (accidental access signal sends regularly and frequency for switching terminal) causes.
4. when switching, can send the index of the CAZAC sequence of the applicable lead code of using in the timing of accidental access signal and frequency, use the less index of PAPR of lead code portion when having utilized this sequence.
Power output rollback amount in transmitted signal amplifier in the time of can reducing the transmission of lead code portion.The terminal of switching is near cell edge, distant apart from base station, need higher transmitted power, and if make rollback amount less, can access following effect: (1) can improve average transmitting power, (2) can reduce the possibility that transmitted power is inadequate.
The little index of so-called PAPR, can be assumed to be the index beyond the index that PAPR in Fig. 2 for example surpasses 6dB.In addition, as the smaller index of PAPR, also can from 1～75,132～168,225～298 scope, select index.If L shows with sequence length, also can in the scope of 1～L/3, L/2-L/16～L/2+L/16,2L/3～L-1, select.
5. when switching, can send the index information of the CAZAC sequence of the applicable lead code of using in the timing of accidental access signal and frequency, when switching, by handover source base station, notify this terminal.
6. the index of the CAZAC sequence of the applicable lead code of using while switching is to use the little index of PAPR.So-called PAPR is little, mean roughly the PAPR of following situation: when being present in the mobile terminal at edge, base station cell and sending accidental access signal to base station, in the scope of the transmitted power of mobile terminal, according to accidental access signal, can be reduced by the normal degree receiving in base station the rollback amount of the operating point of transmitted signal amplifier.Calculate in advance and the state of definite mobile terminal what kind of time how to use the sequence of index.
7. the index information of the CAZAC sequence of the applicable lead code of using when switching is notified this terminal by handover source base station when switching.
Fig. 3 is the figure of the 1st principle of explanation embodiments of the present invention.
In Fig. 3, establishing transverse axis is frequency, and establishing the longitudinal axis is the time, and the signal of the frequency direction of down link signal and uplink signal and time orientation is shown side by side.Synchronizing channel is set near the centre frequency of the band system band in the subframe transmitting by down link.Synchronizing channel is not to send in the whole subframes that transmit by down link, and the ratio for example sending once according to 5 or 10 frames sends.Before establishing and synchronize in mobile terminal and base station, the signal of down link and the signal of up link are nonsynchronous.Therefore, in embodiments of the present invention, when switching, if synchronizing channel detected in the signal of down link, the subframe of the up link of the time start elapsed time skew Toffset from this time after, carry (preservation) accidental access signal, and send to base station from mobile terminal.Because the synchronizing channel of down link is positioned near the centre frequency of system bandwidth, so carrying the frequency of accidental access signal, hypothesis is positioned near the centre frequency of system bandwidth of up link.In Fig. 3, oblique line is partly the time slot that sends accidental access signal.The accidental access signal sending can stride across a plurality of continuous subframes, but the subframe that starts to send accidental access signal is made as and the accidental access signal length subframe of the up link of the time after the synchronizing channel of down link starts elapsed time skew Toffset independently.Suppose when accidental access signal sends unsuccessfully (when not sending response signal from base station), in same place (subframe the up link after starting elapsed time skew Toffset through the timing of the synchronizing channel of other down links of transmission after a period of time), carries out the transmission again of accidental access signal again.Certainly, when giving the send opportunity of a plurality of accidental access signals for a synchronizing channel, can not wait for next synchronizing channel, and send accidental access signal in ensuing send opportunity.
Fig. 4 is the figure of the 2nd principle of explanation embodiment of the present invention.
In Fig. 4, the same with Fig. 3, establishing transverse axis is frequency, and establishing the longitudinal axis is the time, and the signal of down link and up link is shown.In Fig. 4, the structure that adapts to following situation is shown: system bandwidth is wider, and the reception bandwidth of receiver side mobile terminal only has half of system bandwidth.That is,, in down link signal, synchronizing channel is arranged near two frequencies (still, also can being sent out in more than 3 places) in a subframe.In embodiments of the present invention, suppose to send the frequency in the frequency band of uplink signal in the band system band that switching terminal is uplink signal by the frequency of accidental access signal, corresponding with the frequency of synchronizing channel in being set with down link signal.Such as, when synchronizing channel is positioned at the core of the frequency band separately that is divided into 2 frequency bands of down link signal, establish the core that accidental access signal is also positioned at the frequency band separately that is divided into 2 frequency bands of uplink signal.In addition the timing that, starts to send accidental access signal be located at down link signal detected in synchronizing signal after after elapsed time skew Toffset in the subframe of corresponding uplink signal.In Fig. 4, oblique line is partly the time slot that starts to send accidental access signal.Because synchronizing channel is located in 2 time slots in down link signal, therefore, in uplink signal, also exist 2 places can send the time slot of accidental access signal.The accidental access signal sending can stride across a plurality of continuous subframes, but the subframe that starts to send accidental access signal is made as and the accidental access signal length subframe of the up link of the time after the synchronizing channel of down link starts elapsed time skew Toffset independently.Suppose when accidental access signal sends unsuccessfully (when not sending response signal from base station), in same place (subframe the up link after starting elapsed time skew Toffset through the timing of the synchronizing channel of other down links of transmission after a period of time), carries out the transmission again of accidental access signal again.
Fig. 5～Fig. 7 is the figure that the order while switching according to embodiment of the present invention is shown.
Fig. 5 illustrates first case.In Fig. 5, (movement) terminal is delivered to moving source base station by the received power measurement result of the signal from peripheral cell (pilot signal etc.) etc., and moving source base station is determined and switched (1).So, from moving source base station by information of the confirmation of switching, terminal etc., deliver to mobile object base station.In mobile object base station, if obtain information from moving source base station, set, make not the special-purpose accidental access signal of switching terminal to send regularly and frequency is divided the uplink data (2) that is used in the terminal that transmission do not switch.As previously mentioned, this timing is the frequency in the corresponding up link of the frequency of the synchronizing channel with transmission down link and the timing after terminal reception synchronizing channel starts elapsed time skew with frequency.When the state of communicating by letter with moving source base station from terminal, start till during the terminal that do not switch (2), can send regularly and frequency accidental access signal for the terminal distribution switching terminal of the state not switching.If the setting of (2) finishes in mobile object base station, the system information of the sequence index that comprises the CAZAC sequence that the accidental access signal that uses while switching uses is sent to moving source base station.Now, from the little CAZAC sequence of PAPR, select and send.As previously described above, the index that so-called PAPR is little can be assumed to be PAPR in Fig. 2 for example and surpass the index outside the index of 6dB.And, as the index that PAPR is smaller, can from 1～75,132～168,225～298 scope, select index.If L shows with sequence length, also can in the scope of 1～L/3, L/2-L/16～L/2+L/16,2L/3～L-1, select.
But, also can after system information etc. is delivered to moving source base station, carry out the setting of (2).From mobile object base station, receive the moving source base station of system information etc. for the terminal of switching object, send the system information of the mobile object community of the sequence index that comprises the CAZAC sequence of using while switching, and indication starts to switch.Then, when there are the data that do not send for this terminal, moving source base station is sent to mobile object base station by these data.But, also can after handover success, transmit the data that do not send.
Receive switch start indication terminal in (3), start synchronously to process to mobile object community.Terminal catches the synchronizing channel (4) from the down link of mobile object base station, sends accidental access signal (synchronously establishing signal) lead code portion to mobile object base station.Can multiplexing (code division multiplexing, time division multiplexing etc.) control information in lead code portion etc.Now, the transmission of accidental access signal lead code portion is used the special-purpose accidental access signal of switching terminal to send timing and the frequency of use.Mobile object base station receives accidental access signal lead code portion, if correctly identify this lead code portion sequence, successfully talks about, and terminal is carried out the notice of lead code portion confirmation of receipt notice and uplink data transmission timing and frequency.If terminal receives these notices, to mobile object base station, send the signal that represents finishing switching notice, if mobile object base station receives this signal, once establish needed processing with the wireless link of terminal room, finish, just to moving source base station, send finishing switching notification signal.Then, mobile object base station restarts switching terminal special-purpose accidental access signal transmission timing and frequency to be assigned as the uplink data (5) for sending the terminal of not carrying out switching.
Between (2) of Fig. 5～(5), be that the terminal that will switch is distributed to the time interval of the terminal of switching by transmission timing and the frequency of accidental access signal with the form of monopolizing.(5) afterwards, when do not have other switching terminal time, the terminal that will switch to the terminal distribution of the state not switching is with the transmission of accidental access signal regularly and frequency.
Fig. 6 illustrates second case.In Fig. 6, (movement) terminal sends to moving source base station by the received power measurement result of the signal from peripheral cell (pilot signal etc.) etc., and moving source base station is determined and switched (1).So, from moving source base station by information of the confirmation of switching, terminal etc., deliver to mobile object base station.In mobile object base station, if obtain information from moving source base station, set, make not the special-purpose accidental access signal of switching terminal to send regularly and frequency is divided the uplink data (2) that is used in the terminal that transmission do not switch.As previously mentioned, this timing is the frequency in the corresponding up link of the frequency of the synchronizing channel with transmission down link and the timing after terminal reception synchronizing channel starts elapsed time skew with frequency.When the state of communicating by letter with moving source base station from terminal, start till during the terminal that do not switch (2), can send regularly and frequency for accidental access signal for the terminal distribution switching terminal of the state not switching.In the first case of Fig. 5, if the setting of (2) finishes in mobile object base station, the system information of the sequence index that comprises the CAZAC sequence that the accidental access signal that uses while switching uses is sent to moving source base station.But, also can after system information etc. is delivered to moving source base station, carry out the setting of (2).But, in the second case of Fig. 6, by CAZAC sequences which sequence decision is used use as accidental access signal in advance such as system specializations.The information that does not comprise CAZAC sequence from mobile object base station sends to the system information of terminal via moving source base station.Moving source base station sends the system information of mobile object community for terminal, indication starts to switch.Then, when there are the data that do not send for this terminal, transmit these data moving source base station to mobile object base station.But, also can after handover success, transmit the data that do not send.
Receive switch start indication terminal in (3), start the synchronous processing to mobile object community.Terminal catches the synchronizing channel (4) from the down link of mobile object base station, sends accidental access signal lead code portion to mobile object base station.Can multiplexing (code division multiplexing, time division multiplexing) control information in lead code portion etc.Now, the transmission of accidental access signal lead code portion is used the special-purpose accidental access signal of switching terminal to send timing and the frequency of use.Mobile object base station receives accidental access signal lead code portion, if correctly identify the sequence of this lead code portion, successfully talks about, and terminal is carried out the notice of lead code confirmation of receipt notice and uplink data transmission timing and frequency.If terminal receives these notices, to mobile object base station, send finishing switching notice, if mobile object base station receives this notice, once establish needed processing with the wireless link of terminal room, finish, just to moving source base station, send finishing switching notification signal.Then, mobile object base station restarts switching terminal special-purpose accidental access signal transmission timing and frequency to be assigned as the uplink data (5) for sending the terminal of not carrying out switching.
Between Fig. 6 (2)～(5), be that the terminal that will switch is distributed to the time interval of the terminal of switching by transmission timing and the frequency of accidental access signal with the form of monopolizing.(5) afterwards, when do not have other switching terminal time, accidental access signal sends regularly and frequency for the terminal that will switch for the terminal distribution of the state not switching.
Fig. 7 illustrates the 3rd example.In Fig. 7, (movement) terminal is delivered to moving source base station by the received power measurement result of the signal from peripheral cell (pilot signal etc.) etc., and moving source base station is determined and switched (1).So, from moving source base station by information of the confirmation of switching, terminal etc., deliver to mobile object base station.In the 3rd example, switching terminal special-purpose accidental access signal transmission timing and frequency are redefined for to accidental access signal special use, so that do not use it for other purposes.As previously mentioned, this timing is the frequency in the corresponding up link of the frequency of the synchronizing channel with transmission down link and the timing after terminal reception synchronizing channel starts elapsed time skew with frequency.Moving source base station is delivered to by the system information of the sequence index that comprises the CAZAC sequence that the accidental access signal that uses while switching uses in mobile object base station.The system information of the mobile object community of the moving source base station sequence index that transmission comprises the CAZAC sequence of using while switching for terminal, indication starts to switch.Then, when there are the data that do not send for this terminal, transmit these data moving source base station to mobile object base station.But, also can after handover success, transmit the data that do not send.
Receive switch start indication terminal in (2), start the synchronous processing to mobile object community.Terminal catches the synchronizing channel (3) from the down link of mobile object base station, sends accidental access signal lead code portion to mobile object base station.Now, the transmission of accidental access signal lead code portion is used the special-purpose accidental access signal of switching terminal to send timing and the frequency of use.Mobile object base station receives the lead code that comprises accidental access signal, if correctly identify this lead code portion sequence, successfully talks about, and terminal is carried out the notice of lead code confirmation of receipt notice and uplink data transmission timing and frequency.If terminal receives these notices, to mobile object base station, send finishing switching notification signal, if mobile object base station receives this signal, once establish needed processing with the wireless link of terminal room, finish, just to moving source base station, send finishing switching notification signal.
Fig. 8 is the frame assumption diagram of the mobile terminal based on embodiment of the present invention.
From reception antenna receives signal, radio section 10 carries out demodulation, and 11 pairs of signals of lsb decoder are decoded, the sequence information using while obtaining user data/packets of voice, control signal, switching, switching index signal.In addition, the output of radio section 10 is sent in downlink Synchronization Channel Return Reception Dept. 13, carries out synchronizing channel reception & disposal, and reception result is sent to and switches in operation control part 14.The sequence of switch that operation control part 14 is controlled the receive frequency control part 12 of controlling receive frequency in order to receive synchronizing channel, the sequence determination portion 15(that determines the sequence of using in accidental access signal take in accidental access signal to be used notify as example and is considered by handover source wireless base station), the judgement timing of accidental access signal and the accidental access signal of frequency send timing and frequency judging part 19.
According to accidental access signal, send regularly and the judgement of frequency judging part 19, transmission frequency control part 20 is controlled radio section 28 and modulation portion 27, according to timing and the frequency of the present invention's regulation, sends accidental access signal.If determined in sequence determination portion 15 and used which sequence, in preamble signal with generating determined sequence in sequence generating unit 16, the preamble signal that random access lead code signal generating unit 17 is used this sequences generation to comprise accidental access signal.This signal is re-used and is input in exchange (reshuffling) unit 26 together with control information in multiplexing unit 18.
On the other hand, packets of voice and user data, peripheral cell measurement result are imported in multiplexing/exchange portion 21, are re-used or exchange output, in chnnel coding portion 22, are encoded.Control signal is also encoded in chnnel coding portion 23.The output of chnnel coding portion 22,23 is re-used and exports or exchange output in multiplexing/exchange portion 24, in physical channel generating unit 25, is mapped on physical channel, is then imported in exchange portion 26.In exchange portion 26, exchange output, from the signal of multiplexing unit 18 with from the signal of physical channel generating unit 25, is delivered to transmitting antenna via modulation portion 27 and radio section 28.
The frame assumption diagram of moving source base station when Fig. 9 is the switching based on embodiment of the present invention.
The signal that reception antenna receives is demodulated in radio section 30, decoded in lsb decoder 31.In signal from decoded, obtain the measurement result of peripheral cell, whether this terminal that peripheral cell measurement result is sent in switching judging unit 32 judgements needs to switch.When being judged as need to switch time, to the mobile object base station of terminal, send the confirmation of switching and the information of switching object terminal.
For example, if the accidental access signal preamble information of using when sending the system information of mobile object base station from the mobile object base station of terminal and switching (, determine the long L of sequence of the sequence that PAPR is little, the information such as index K) words, switch action handling part 33 and generate switching beginning index signal, the accidental access signal preamble sequence information of using when the system information of mobile object base station and switching, in physical channel generating unit 34, these information are mapped on physical channel, via modulation portion 35 and radio section 36, from transmitting antenna, to this terminal, send.
The frame assumption diagram of mobile object base station when Figure 10 is the switching based on embodiment of the present invention.
First, from the moving source base station of terminal, receive switching confirmation and switch object end message.So, the accidental access signal preamble sequence information that switching action handling part 42 is used when the moving source base station transmission of terminal is switched and the system information of base station.In addition, switching action handling part 42Dui uplink radio resources management department 47 asks as follows: the distribution of the transmission timing of accidental access signal and the use restriction of frequency and request switching terminal uplink radio resources of use before finishing switching of request switching terminal.Uplink radio resources management department 47 sends the assignment information of uplink radio resources via physical channel generating unit 48, modulation portion 49, radio section 50 to terminal.
If carry out the signal of adaptive switched object terminal via reception antenna, radio section 40, lsb decoder 41 receptions, whether random access reception input handling part 43 detection accidental access signals are sent to.Random access receives input handling part 43 and is switching the Check processing that carries out accidental access signal under the control of moving handling part 42, receiving lead code confirmation unit 44.If receive lead code confirmation unit 44, confirm to receive accidental access signal lead code, via physical channel generating unit 48, modulation portion 49, radio section 50, the confirmation of receipt information of lead code is delivered to terminal.Receive after accidental access signal, accidental access signal receives regularly the reception timing that test section 45 detects accidental access signal, computing terminal sends skew regularly, generate up link and send correction of timing information signal, and via physical channel generating unit 48, modulation portion 49, radio section 50, this signal is delivered to terminal.
When receiving the end side hand-off process end notification signal sending from terminal, 46 judgements of finishing switching judging part are switched and are finished, and discharge accidental access signal transmission timing and frequency for switching terminal to up link RRM portion 47 notice request, once and and terminal between wireless link establish needed processing and finish, just the moving source base station to terminal sends finishing switching notification signal.In addition, the synchronizing channel from mobile object base station receiving when transmitting antenna transmitting terminal is carried out switching via physical channel generating unit 48, modulation portion 49, radio section 50.
Said structure is the structure corresponding with the order of Fig. 5, but those skilled in the art should be easy to associate the structure in Fig. 6 and Fig. 7 situation.
Claims (2)
1. a mobile radio station, this mobile radio station receives and switches the synchronizing channel that object wireless base station sends, and then via the Random Access Channel with the frequency different from the receive frequency of described synchronizing channel, sends accidental access signal, establishes thus up-link wireless circuit, it is characterized in that
This mobile radio station has configuration part, and it is benchmark that the described synchronizing channel receiving be take in this configuration part, after the stipulated time, sets the transmission of described accidental access signal regularly.
2. a wireless communication system, it comprises mobile radio station, this mobile radio station receives and switches the synchronizing channel that object wireless base station sends, then via the Random Access Channel with the frequency different from the receive frequency of described synchronizing channel, send accidental access signal, establish thus up-link wireless circuit, it is characterized in that
Described wireless base station has the sending part that sends described synchronizing channel;
Described mobile radio station has configuration part, and it is benchmark that the described synchronizing channel receiving be take in this configuration part, after the stipulated time, sets the transmission of described accidental access signal regularly.
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| US9768925B2 (en) * | 2012-11-04 | 2017-09-19 | Lg Electronics Inc. | Method for transmitting/receiving synchronizing signals in wireless communication system and device therefor |
| CN111083714A (en) * | 2015-10-29 | 2020-04-28 | 华为技术有限公司 | Method for transmitting system information, base station, terminal and system |
| CN107623933B (en) * | 2016-07-15 | 2019-12-10 | 电信科学技术研究院 | Method and device for transmitting initial access signal |
| CN108207025B (en) * | 2016-12-19 | 2020-12-22 | 华为技术有限公司 | Synchronization signal sending method and device |
| WO2018173230A1 (en) * | 2017-03-23 | 2018-09-27 | 株式会社Ｎｔｔドコモ | User device and random access preamble transmission method |
| CN112468286B (en) * | 2021-02-03 | 2021-06-01 | 南京信息工程大学 | Hash algorithm-based low-PAPR high-safety optical transmission method |
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| US5257399A (en) * | 1990-11-28 | 1993-10-26 | Telefonaktiebolaget L M Ericsson | Multiple access handling in a cellular communications system |
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| US8116195B2 (en) * | 2004-07-27 | 2012-02-14 | Zte (Usa) Inc. | Transmission and reception of reference preamble signals in OFDMA or OFDM communication systems |
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| CN1146701A (en) * | 1995-06-27 | 1997-04-02 | 株式会社东芝 | Digital mobile radio communication device |
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