CN102695226A - Mobile radio station and radio communication system - Google Patents
Mobile radio station and radio communication system Download PDFInfo
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- CN102695226A CN102695226A CN2012101487345A CN201210148734A CN102695226A CN 102695226 A CN102695226 A CN 102695226A CN 2012101487345 A CN2012101487345 A CN 2012101487345A CN 201210148734 A CN201210148734 A CN 201210148734A CN 102695226 A CN102695226 A CN 102695226A
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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 the radio communication device that sends accidental access signal when synchronous when portable terminal and base station.
Background technology
In carrying out the EUTRAN (Evolved UTRAN) as the system of future generation of 3GPP system of basic research at present, the leap different base station that takes place along with moving of the portable terminal switching between cell covered respectively is a direct-cut operation.In direct-cut operation, after the circuit of the base station of before having cut off portable terminal and having moved, having communicated by letter is connected, the circuit of connection portable terminal and mobile purpose base station.Direct-cut operation can be about to switch the system information that obtains moving the purpose base station before, and switches at short notice, but in switching, the state that the user data transmission is interrupted can take place.
In addition; In EUTRAN; As the employed sign indicating number of 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 that sends between the radio zone of up link.As the CAZAC sequence Zadoff-Chu sequence, GCL sequence etc. are arranged.Below, the formula of expression as a kind of Zadoff-Chu sequence of CAZAC sequence is shown:
In above-mentioned formula, L is a sequence length, and k is a sequence index.Particularly when length L was prime number length, this sequence had good autocorrelation performance and their cross correlation.
Fig. 1 be according to the CAZAC sequence be created on the accidental access signal that uses in the radio section up link of EUTRAN lead code portion circuit one the example block diagram.
The CAZAC sequence of length M (L) is imported in the DFT portion 10 after carrying out the serial conversion, and being become also by Fourier transform, line number is the parallel signal of M.This signal is imported in the subcarrier mapping portion 11 and is mapped on the N number of sub-carrier.The sub-carrier signal that has shone upon the CAZAC sequence is input to carries out inverse fourier transform in the IFFT portion 12, and be input in parallel/serial converted portion 13.And line number is that the output signal of the IFFT portion 12 of N is transformed to serial signal, is exported as the random access lead code sequence by parallel/serial converted portion 13.
And, suppose that system bandwidth in EUTRAN (transmission bandwidth that the base station is sent, received between radio zone) is 20MHz to the maximum, to send the minimum bandwidth that receives be 10MHz at the terminal at present.The terminal has the ability of the signal of 10MHz width at least being sent reception.In addition, also suppose to the system bandwidth different base stations adjacent sub-district launch.In order to make the terminal irrespectively easily carry out search of initial zone and switching with system bandwidth, synchronizing channel of sending in will be between the radio zone of down link and report signal channel (transmit the channel of the information etc. of sub-district, base station.Below, be expressed as reporting channel) be configured in the center of the transmission band of down link.But, when system's transmission bandwidth is 20MHz, also to consider the problem of 2 to 3 positions placement synchronizing channels in transmission band.This is to be the problem that the portable terminal of 10MHz is taken into account with exist to send receiving signal bandwidth.
No matter under which kind of situation, all not necessarily in whole subframes, insert synchronizing channel and send, suppose that inserting synchronizing channel according to per 5,10 or 20 subframes sends.
In EUTRAN; Switch to direct-cut operation between the neighbor cell that different base station covers; When in certain portable terminal is carrying out process that data transmit, beginning to switch; The transmission that is in the down link data of transmit status to this terminal is interrupted, and is sent to from the base station of ongoing communication to switch the purpose base station.And, before finishing switching, in the buffer of base station side, need storage to be directed against the down link data of this portable terminal, still along with the time that switching needs is elongated, the data volume that should put aside in the buffer also increases.Likewise, when switching beginning, this portable terminal should send to the uplink data of base station side and also end to send, and need be stored in the buffer of mobile terminal side.In this case, in handoff procedure, might certain data be dropped, under the situation of normal data, needed the upper strata to send once more.In addition, carrying out for the basis with HARQ (Hybrid Automatic Repeat reQuest, mix automatically retransmit) under the state that continuous data sends, when switching, also may produce and give the situation that the sequence number to continuous data is replaced successively.When in the voice call of packets of voice, switching, the packets of voice that down link also can take place is sent to the situation of switching the purpose base station and interrupting voice call.And owing to be real-time voice communication, all packets of voice that are transmitted not necessarily are used effectively in the transmission destination.
Under above situation, unfavorablely be, the kind of data is no matter be common data or packets of voice, it is all very long to switch the needed time.
In the process of switching, the downlink Synchronization Channel of sending from switching purpose base station need be caught in the terminal, and after obtaining synchronously, in up link, sends accidental access signal.After in down link, obtaining synchronously,, then might shorten and switch the needed time if can send accidental access signal apace.
In addition; When using the CAZAC sequence, even the length L of the CAZAC sequence of using is identical, because the index k of sequence is different as the lead code portion of accidental access signal; The PAPR of lead code portion (Peak-to-average power ratio, 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 the Zadoff-Chu sequence is shown.
The sequence length of the Zadoff-Chu sequence of using among Fig. 2 is fixed, and carries out various variations through the index k to sequence and investigates PAPR.Can learn, the difference of the PAPR value more than the 3dB can take place based on index value.That is, the big sequence of PAPR is compared with average power, and its peak power is big more.
In order when portable terminal sends lead code portion, the signal waveform of lead code portion to be deformed, use the big more CAZAC sequence of PAPR value as lead code, then the transmission output rollback amount of the sending part power amplifier of portable terminal needs is big more.Usually, when increase rollback amount was moved amplifier, it is big 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 the linear amplification characteristic, and this amplification characteristic is from beginning to become nonlinear characteristic near certain input power value that amplifier determined, magnification ratio is saturated and diminish.When using the big CAZAC sequence of PAPR to amplify as the signal of lead code; Because the average power of this signal and the difference of peak power are bigger; 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 because the saturated linear amplification that do not carry out of amplification characteristic causes signal skew.Therefore,, make the average power signal step-down of input amplifier, when signal power reaches peak value, must make this power not arrive the saturated zone of amplification characteristic of amplifier for the erasure signal distortion.In the amplification characteristic of amplifier, the point at the average power of input power or power output place is called operating point, the reduction that will begin from the output saturation point of operating point is called the rollback amount.
In non-patent literature, record the explanation relevant with EUTRAN.In addition, record CAZAC sequence in the non-patent literature 2 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 provides a kind of in the GSM that carries out direct-cut operation, and the time of the data instantaneous trip when as far as possible making switching shortens, also realizes effectively the radio communication device of direct-cut operation.
During switching, because portable terminal is positioned near the cell edge, institute is so that the transmitted power of the needed transmitted power of preamble signal that base station acceptance division success mobile terminal receive sends during greater than near be positioned at the base station portable terminal transmission same preamble coded signal.And, might be near the needed transmitted power of lead code portion of sending accidental access signal the cell edge of the big sub-district of radius of society greater than the maximum possible transmitted power of this portable terminal.
In addition, in the process of switching, the terminal need be caught from switching the downlink Synchronization Channel that send the purpose base station, obtain synchronously after, in up link, send accidental access signal.If can promptly send accidental access signal after in down link, having obtained synchronously, then might shorten and switch the needed time.At this; Adopted a kind of radio communication device among the present invention, its band segmentation with up link and down link becomes narrower frequency band and distribute data, communicates with wireless mode; It is characterized in that; This radio communication device has: the synchronizing signal capture unit, and when receiving the notice that should switch, this synchronizing signal capture unit is caught and is switched the synchronizing signal that send the purpose base station; Establish signal transmitting unit synchronously; It begins through after the stipulated time from the timing that captures this synchronizing signal; Use the frequency location in the uplink band, the synchronous establishment signal that will be used to establish with this switching purpose base station synchronization sends to this switching purpose base station.
It is the same to send the relation of sending the frequency location of establishment signal synchronously in relation and the uplink band of frequency location of synchronizing signal in the preferred downlink frequency band.For example, when the frequency location that sends synchronizing signal in the down link frequency band during, send in the centre frequency position of uplink band and to establish signal synchronously corresponding to the centre frequency position.And, owing to be the signal (for example, the lead code of accidental access signal) that sends from the position of departing from the wireless base station, therefore suppressed to send the increase of the rollback amount of output.
At this; Adopted a kind of mobile radio station among the present invention; This mobile radio station receives and switches the synchronizing channel that the purpose wireless base station sends, and sends accidental access signal via RACH then, establishes the up-link wireless circuit thus; It is characterized in that; This mobile radio station has lead code generation portion, and the CAZAC sequence that is used as the lead code of said accidental access signal in this lead code generation portion a plurality of CAZAC sequences that index is different is restricted to the CAZAC sequence of regulation, and utilizes the CAZAC sequence of this restriction to generate the lead code of said accidental access signal.
Description of drawings
Fig. 1 be according to the CAZAC sequence be created on the accidental access signal that uses in the radio section up link of EUTRAN lead code portion circuit one the example block diagram.
Fig. 2 is the figure of PAPR characteristic that the preamble signal of the bandwidth 5MHz that uses the 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 when switching according to embodiment of the present invention is shown.
Fig. 6 is the figure (its 2) that the order when switching according to embodiment of the present invention is shown.
Fig. 7 is the figure (its 3) that the order when switching according to embodiment of the present invention is shown.
Fig. 8 is based on the frame assumption diagram of the portable terminal of embodiment of the present invention.
The frame assumption diagram of the moving source base station when Fig. 9 is based on the switching of embodiment of the present invention.
The frame assumption diagram of the mobile purpose base station when Figure 10 is based on the switching of embodiment of the present invention.
Embodiment
In embodiments of the present invention, adopt following means.
1. can be made as to timing and the frequency that the base station of moving the purpose sub-district (switching the purpose base station) sent the non-synchronous type accidental access signal in the time of will switching: and the radio zone of the down link of mobile purpose sub-district between send on the sub-band between the radio zone of up link of the corresponding mobile purpose of sub-band (frequency domain of the transmission synchronizing channel when the whole wireless transmission band that in radio communication, uses is divided into several frequency bands in the divided frequency domain) sub-district of synchronizing channel, and from the timing (in the corresponding subframe of this timing) of offset stipulated time of the downlink Synchronization Channel that moves the purpose sub-district.But the length of the lead code portion of non-synchronous type accidental access signal is because the size of sub-district and difference sometimes.For example, the lead code portion of non-synchronous type accidental access signal strides across a plurality of continuous subframes in big sub-district sometimes, and the transmission of non-synchronous type accidental access signal is begun regularly to be made as from the offset of the synchronizing channel timing of identical stipulated time.
In addition, during switching, from the moving source base station to the portable terminal that switches notice with move the purpose sub-district the relevant information of length of lead code portion of the non-synchronous type accidental access signal that uses.
In addition, time offset is unique to be confirmed, shared in whole sub-districts of a GSM.At this moment, time offset both can be stored in the storage part by portable terminal in advance, also can be specified by handover source or purpose wireless base station.Therefore like this, if time offset is constant,, can establish the circuit of base station and mobile radio station apace even then the base station does not stride across whole communication band within a certain period of time and searches from the accidental access signal of each portable terminal passablely yet.
In addition, for portable terminal, after establishing synchronously, according to the position of this synchronizing channel, can be at the determined timed sending accidental access signal of shift time (T) by regulation.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 needn't so big buffer.
Can set the send opportunity (after the T shift time) of an accidental access signal to a synchronizing channel, but also can set repeatedly (for example twice).For example, to synchronizing channel, also can after shift time T, 2T, give the send opportunity of accidental access signal.When in initial chance, having conflict, need not wait for that also the transmission cycle of synchronizing channel just can access next chance.
In addition, as the example of T, be preferably it is redefined for shorter than the transmission cycle of synchronizing channel; And, if T is set at below 5 subframes, particularly; Be set at 3 to 4 subframes, then can very appropriate and carry out the seizure of synchronizing channel with having advantage and handle, send and handle these both sides.
2. the other-end of non-switching state can send the timing and the frequency of accidental access signal when can not use the switching shown in 1.
That is the timing of the accidental access signal in the time of, will specifying timing, the frequency of sending accidental access signal to be made as this switching and timing, the frequency beyond the frequency to the other-end of non-switching state.
Thus, can reduce the collision probability of accidental access signal in mobile purpose (switching purpose) the base station acceptance division greatly, can shorten and switch the needed time.
3. when not having the terminal that to be ready switching to the sub-district of certain base station; The timing and the frequency of use can be monopolized in terminal when the scheduler of this base station switches only having shown in 2, and the other-end of distributing in this sub-district to be ready using to the uplink signal of this base station transmission.For example, based on as get off to judge whether to exist the terminal of switching, that is: according to base station or aGW (access Gate Way from neighbor cell.Corresponding with the base-station control apparatus of WCDMA system) (signaling that begins is switched in expression for the relevant signaling of switching of sending; With the relevant information in terminal of switching object, require to guarantee to switch the signaling etc. of the Radio Resource of the used for mobile terminal that comes) and after finishing switching, finished and the control signal of sending etc. to the switching of switching purpose base station for direct (or indirectly) display terminal.
When not having the terminal that to be ready switching, can avoid because of not using the reduction of the Radio Resource utilization ratio that Radio Resource (switching terminal sends regularly and frequency with accidental access signal) causes.
4. the index of the CAZAC sequence of employed suitable lead code in the timing that when switching, can send accidental access signal and the frequency, the less index of PAPR of use lead code portion when having utilized this sequence.
Power output rollback amount in the transmission signal amplifier in the time of can reducing the transmission of lead code portion.The terminal of switching is near the cell edge; Distance apart from the base station is far away; Need higher transmit power, and if make the rollback amount less, then can access following effect: average transmitting power can be improved in (1), (2) can reduce the not enough possibility of transmitted power.
The little index of so-called PAPR can be assumed to be the index beyond the index that PAPR among Fig. 2 for example surpasses 6dB.In addition, also can from 1～75,132～168,225～298 scope, select index as the smaller index of PAPR.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 employed suitable lead code in timing and the frequency of accidental access signal, when switching, notify this terminal by handover source base station.
6. the index of the CAZAC sequence of the suitable lead code of using when switching is to use the little index of PAPR.So-called PAPR is little; Be the PAPR that representes roughly following situation: when the portable terminal that is present in the base station cell edge when accidental access signal is sent in the base station; In the scope of the transmitted power of portable terminal, can be got final product by the rollback amount that the normal degree that receives in base station reduce the operating point that sends signal amplifier according to accidental access signal.Calculate in advance and definite status of mobile terminal what kind of the time how to use the sequence of index.
7. the index information of the CAZAC sequence of the suitable lead code of when switching, using is notified this terminal by handover source base station when switching.
Fig. 3 is the figure of the 1st principle of explanation execution mode of the present invention.
Among Fig. 3, establishing transverse axis is frequency, and establishing the longitudinal axis is the time, and the frequency direction of down link signal and uplink signal and the signal of time orientation are shown side by side.Synchronizing channel is set near the centre frequency of the band system band in the subframe that transmits through down link.Synchronizing channel is not in the whole subframes that transmit through down link, to send, and the ratio of for example sending once according to 5 or 10 frames is sent.Before portable terminal and base station establishment synchronously, the signal of down link and the signal of up link are nonsynchronous.Therefore; In embodiments of the present invention; When switching; If in the signal of down link, detect synchronizing channel, then carry (preservation) accidental access signal the subframe of the up link of the time begin elapsed time skew Toffset from this time after, and send to the base station from portable terminal.Because the synchronizing channel of down link is positioned near the centre frequency of system bandwidth,, hypothesis is positioned near the centre frequency of system bandwidth of up link so carrying the frequency of accidental access signal.Among Fig. 3, oblique line partly is the time slot that sends accidental access signal.The accidental access signal that sends can stride across a plurality of continuous subframes, but the subframe that will begin 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 begins elapsed time skew Toffset irrespectively.Suppose when accidental access signal sends failure (when not sending response signal) from the base station; In same place (subframe on the up link after beginning elapsed time skew Toffset from the timing of the synchronizing channel of other down links of after after a while, sending) carried out the transmission once more of accidental access signal once more.Certainly, when giving the send opportunity of a plurality of accidental access signals, can not wait for next synchronizing channel, and in ensuing send opportunity, send accidental access signal to a synchronizing channel.
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.Among Fig. 4, the structure that adapts to following situation is shown: system bandwidth broad, the reception bandwidth of receiver side portable terminal have only the half the of system bandwidth.That is, in down link signal, synchronizing channel is set near two frequencies (still, also can being sent out in the place more than 3) in the sub-frame.In embodiments of the present invention, suppose to send frequency that switching terminal uses accidental access signal as in the band system band of uplink signal, and be set with the frequency in the frequency band of the corresponding uplink signal of frequency of the synchronizing channel in the 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 also is positioned at the frequency band separately that is divided into 2 frequency bands of uplink signal.In addition, the timing that begins to send accidental access signal is located at and detects after the synchronizing signal in the down link signal after the elapsed time skew Toffset in the subframe of corresponding uplink signal.Among Fig. 4, oblique line partly is the time slot that begins to send accidental access signal.Because synchronizing channel is located in 2 time slots in the down link signal, therefore, in uplink signal, also exists 2 places can send the time slot of accidental access signal.The accidental access signal that sends can stride across a plurality of continuous subframes, but the subframe that will begin 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 begins elapsed time skew Toffset irrespectively.Suppose when accidental access signal sends failure (when not sending response signal) from the base station; In same place (subframe on the up link after beginning elapsed time skew Toffset from the timing of the synchronizing channel of other down links of after after a while, sending) carried out the transmission once more of accidental access signal once more.
Fig. 5～Fig. 7 is the figure that the order when switching according to embodiment of the present invention is shown.
Fig. 5 illustrates first example.In Fig. 5, (moving) terminal will be measured result from the received power of the signal (pilot signal etc.) of peripheral cell and wait and deliver to the moving source base station, and (1) is confirmed to switch in the moving source base station.So the affirmation that will switch from the moving source base station, terminal information etc. are delivered to and are moved the purpose base station.In mobile purpose base station, if obtain information, then set from the moving source base station, make switching terminal special-purpose accidental access signal transmission timing and Frequency Distribution not to be used to send the uplink data (2) at the terminal of not switching.As previously mentioned, this timing and frequency for the corresponding up link of frequency of the synchronizing channel of sending down link in frequency and receive synchronizing channel from the terminal and begin the timing after the elapsed time skew.When terminal that the state of communicating by letter from terminal and moving source base station begins till (2), not switch, can the terminal distribution switching terminal of the state that do not switch be sent regularly and frequency with accidental access signal.If the setting of (2) finishes in moving the purpose base station, the system information of the sequence index of the CAZAC sequence that the accidental access signal that will use in the time of then will comprising switching is used sends to the moving source base station.At this moment, from the little CAZAC sequence of PAPR, select and send.As previous explanation, the index that so-called PAPR is little can be assumed to be that PAPR surpasses the index outside the index of 6dB among Fig. 2 for example.And, can from 1～75,132～168,225～298 scope, select index as the index that PAPR is smaller.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 the moving source base station, carry out the setting of (2).From moving moving source base station that the purpose base station receives system information etc., send the mobile purpose system information of subdistricts of the sequence index that comprises the CAZAC sequence of using when switching, and indication begins to switch to the terminal of switching object.Then, when having the data that do not send to this terminal, the moving source base station is sent to these data and moves the purpose base station.But can behind handover success, transmit does not have the data of having sent yet.
Receive and switch the terminal begin to indicate in (3), begin to carry out Synchronous Processing to mobile purpose sub-district.The synchronizing channel (4) from the down link that moves the purpose base station is caught at the terminal, sends accidental access signal (establishing signal synchronously) lead code portion to mobile purpose base station.Can multiplexing (code division multiplexing, time division multiplexing etc.) control information in the lead code portion etc.At this moment, the transmission of accidental access signal lead code portion uses the special-purpose accidental access signal of switching terminal to send the timing and the frequency of usefulness.Move the purpose base station and receive accidental access signal lead code portion,, then the terminal is carried out the notice of lead code portion confirmation of receipt notice and uplink data transmission timing and frequency if correctly discern this lead code portion sequence success.If the terminal receives these notices; Then to moving the signal that expression finishing switching notice is sent in the purpose base station; Receive this signal if move the purpose base station, then in a single day establish needed processing and finish, just send the finishing switching notification signal to the moving source base station with the Radio Link of terminal room.Then, moving the purpose base station restarts the special-purpose accidental access signal of switching terminal is sent regularly and Frequency Distribution is the uplink data (5) that is used to send the terminal of not carrying out switching.
Be the terminal that will switch between (2) of Fig. 5～(5) with the transmission of accidental access signal regularly and frequency distribute to the time interval at the terminal of switching with the form of monopolizing.(5) afterwards, when not having other terminals of switching, with the transmission of accidental access signal regularly and frequency to terminal that the terminal distribution of the state that does not switch will be switched.
Fig. 6 illustrates second example.In Fig. 6, (moving) terminal will be measured result from the received power of the signal (pilot signal etc.) of peripheral cell and wait and send to the moving source base station, and (1) is confirmed to switch in the moving source base station.So the affirmation that will switch from the moving source base station, terminal information etc. are delivered to and are moved the purpose base station.In mobile purpose base station, if obtain information, then set from the moving source base station, make switching terminal special-purpose accidental access signal transmission timing and Frequency Distribution not to be used to send the uplink data (2) at the terminal of not carrying out switching.As previously mentioned, this timing and frequency for the corresponding up link of frequency of the synchronizing channel of sending down link in frequency and receive synchronizing channel from the terminal and begin the timing after the elapsed time skew.When terminal that the state of communicating by letter from terminal and moving source base station begins till (2), not switch, can send regularly and frequency with accidental access signal to the terminal distribution switching terminal of the state that does not switch.In first example of Fig. 5, finish if move the setting of (2) in the purpose base station, the system information of the sequence index of the CAZAC sequence that the accidental access signal that will use in the time of then will comprising switching is used sends to the moving source base station.But, also can after system information etc. is delivered to the moving source base station, carry out the setting of (2).But, in second example of Fig. 6, through prior CAZAC sequences that determines that which sequence of use is used as accidental access signal such as system specializations.The information that from move the purpose base station sends to the terminal via the moving source base station system information, does not comprise the CAZAC sequence.The moving source base station is sent to the terminal and is moved the purpose system information of subdistricts, and indication begins to switch.Then, when having the data that do not send to this terminal, transmit these data the moving source base station to mobile purpose base station.But, also can after handover success, transmit the data that do not send.
Receive and switch the terminal begin to indicate in (3), beginning is to the Synchronous Processing that moves the purpose sub-district.The synchronizing channel (4) from the down link that moves the purpose base station is caught at the terminal, sends accidental access signal lead code portion to mobile purpose base station.Can multiplexing (code division multiplexing, time division multiplexing) control information in the lead code portion etc.At this moment, the transmission of accidental access signal lead code portion uses the special-purpose accidental access signal of switching terminal to send the timing and the frequency of usefulness.Move the purpose base station and receive accidental access signal lead code portion,, then the terminal is carried out the notice of lead code confirmation of receipt notice and uplink data transmission timing and frequency if correctly discern the sequence success of this lead code portion.If the terminal receives these notices; Then send the finishing switching notice to mobile purpose base station; Receive this notice if move the purpose base station, then in a single day establish needed processing and finish, just send the finishing switching notification signal to the moving source base station with the Radio Link of terminal room.Then, moving the purpose base station restarts the special-purpose accidental access signal of switching terminal is sent regularly and Frequency Distribution is the uplink data (5) that is used to send the terminal of not carrying out switching.
Be the terminal that will switch between Fig. 6 (2)～(5) with the transmission of accidental access signal regularly and frequency distribute to the time interval at the terminal of switching with the form of monopolizing.(5) afterwards, when not having other terminals of switching, send regularly and frequency with accidental access signal to the terminal that the terminal distribution of the state that does not switch will be switched.
Fig. 7 illustrates the 3rd example.In Fig. 7, (moving) terminal will be measured result from the received power of the signal (pilot signal etc.) of peripheral cell and wait and deliver to the moving source base station, and (1) is confirmed to switch in the moving source base station.So the affirmation that will switch from the moving source base station, terminal information etc. are delivered to and are moved the purpose base station.In the 3rd example, switching terminal special-purpose accidental access signal transmission timing and frequency are redefined for the accidental access signal special use, so that do not use it for other purposes.As previously mentioned, this timing and frequency for the corresponding up link of frequency of the synchronizing channel of sending down link in frequency and receive synchronizing channel from the terminal and begin the timing after the elapsed time skew.The system information of the sequence index of the CAZAC sequence that the accidental access signal that mobile purpose base station will comprise use when switching is used is delivered to the moving source base station.The mobile purpose system information of subdistricts of the sequence index of the CAZAC sequence of using when the moving source base station comprises switching to the terminal transmission, indication begins to switch.Then, when having the data that do not send to this terminal, transmit these data the moving source base station to mobile purpose base station.But, also can after handover success, transmit the data that do not send.
Receive and switch the terminal begin to indicate in (2), beginning is to the Synchronous Processing that moves the purpose sub-district.The synchronizing channel (3) from the down link that moves the purpose base station is caught at the terminal, sends accidental access signal lead code portion to mobile purpose base station.At this moment, the transmission of accidental access signal lead code portion uses the special-purpose accidental access signal of switching terminal to send the timing and the frequency of usefulness.Move the reception of purpose base station and comprise the lead code of accidental access signal,, then the terminal is carried out the notice of lead code confirmation of receipt notice and uplink data transmission timing and frequency if correctly discern this lead code portion sequence success.If the terminal receives these notices; Then send the finishing switching notification signal to mobile purpose base station; Receive this signal if move the purpose base station, then in a single day establish needed processing and finish, just send the finishing switching notification signal to the moving source base station with the Radio Link of terminal room.
Fig. 8 is based on the frame assumption diagram of the portable terminal of embodiment of the present invention.
Behind reception antenna reception signal, radio section 10 carries out demodulation, and 11 pairs of signals of lsb decoder are decoded, the sequence information that uses when obtaining user data/packets of voice, control signal, switching, switching index signal.In addition, the output of radio section 10 is sent in the downlink Synchronization Channel Return Reception Dept. 13, carries out synchronizing channel and receives processing, and reception result is sent in the change action control part 14.Change action control part 14 control control in order to receive synchronizing channel receive frequency receive frequency control part 12, confirm that the sequence of employed sequence confirms that the accidental access signal of portion 15 (being notified by the handover source wireless base station with employed sequence in the accidental access signal is that example is considered), the timing of judging accidental access signal and frequency sends regularly and frequency judging part 19 in the accidental access signal.
Send regularly and the judgement of frequency judging part 19 according to accidental access signal, transmission frequency control part 20 control radio sections 28 and modulation portion 27 send accidental access signal according to predetermined timing of the present invention and frequency.If in sequence determination portion 15, confirmed to use which sequence, then to use and generate determined sequence in the sequence generating unit 16 in preamble signal, random access lead code signal generating unit 17 uses these sequences to generate the preamble signal that comprises accidental access signal.This signal is re-used in multiplexing 18 with control information and is input in exchange (cut and the replace) portion 26.
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 also is encoded in chnnel coding portion 23.The output of chnnel coding portion 22,23 is re-used in multiplexing/exchange portion 24 and exports or exchange output, in physical channel generating unit 25, is mapped on the physical channel, is imported into then in the exchange portion 26.In exchange portion 26, exchange output is delivered to transmitting antenna from multiplexing 18 signal with from the signal of physical channel generation portion 25 via modulation portion 27 and radio section 28.
The frame assumption diagram of the moving source base station when Fig. 9 is based on the switching of embodiment of the present invention.
The signal that reception antenna received in radio section 30 by demodulation, decoded in lsb decoder 31.Obtain the measurement result of peripheral cell the signal after decoded, switching judging portion 32 judges whether this terminal of sending the peripheral cell measurement result need switch.When being judged as to switch the time, sending the affirmation information switched to the mobile purpose base station at terminal and switch the object terminal information.
If the accidental access signal preamble information of sending the system information that moves the purpose base station from the mobile purpose base station at terminal and using when switching (for example; Confirm the information such as the long L of sequence, index K of the sequence that PAPR is little) words; The accidental access signal preamble sequence information of using when then change action handling part 33 generates switching beginning index signal, the system information that moves the purpose base station and switching; In physical channel generation portion 34; These information mapping on physical channel, via modulation portion 35 and radio section 36, are sent to this terminal from transmitting antenna.
The frame assumption diagram of the mobile purpose base station when Figure 10 is based on the switching of embodiment of the present invention.
At first, the moving source base station from the terminal receives the switching confirmation and switches the object end message.So, the accidental access signal preamble sequence information that change action handling part 42 uses when switching is sent in the moving source base station at terminal and the system information of base station.In addition, 42 pairs of uplink radio resources management departments 47 of change action handling part ask as follows: the request switching terminal is with transmission timing and the use restriction of frequency and the request switching terminal switches the uplink radio resources of using before in end the distribution of accidental access signal.Uplink radio resources management department 47 sends the assignment information of uplink radio resources to the terminal via physical channel generation portion 48, modulation portion 49, radio section 50.
If via the signal at reception antenna, radio section 40, the next adaptive switched object terminal of lsb decoder 41 receptions, then insert reception input handling part 43 detection accidental access signals at random and whether be sent to.Insert at random and receive input handling part 43 carries out accidental access signal under the control of change action handling part 42, reception lead code affirmation portion 44 detection processing.Confirm to receive the accidental access signal lead code if receive lead code affirmation portion 44, then the confirmation of receipt information of lead code is delivered to the terminal via physical channel generation portion 48, modulation portion 49, radio section 50.After receiving 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 the correction of timing information signal, and this signal is delivered to the terminal via physical channel generation portion 48, modulation portion 49, radio section 50.
When receiving the end side hand-off process end notification signal that sends from the terminal; Finishing switching judging part 46 judges that switching finishes; And discharge switching terminal to up link RRM portion 47 notice request and send regularly and frequency with accidental access signal; And in case and the Radio Link between the terminal establish needed processing and finish, just to the moving source base station at terminal transmission finishing switching notification signal.In addition, send the terminal via physical channel generation portion 48, modulation portion 49, radio section 50 from transmitting antenna and carry out the synchronizing channel that receives when switching from mobile purpose base station.
Said structure is and the corresponding structure of the order of Fig. 5, but the those skilled in the art should be easy to associate the structure under Fig. 6 and Fig. 7 situation.
Claims (5)
1. mobile radio station, this mobile radio station receive and switch the synchronizing channel that purpose wireless base station sends, and send accidental access signal via RACH then, establish the up-link wireless circuit thus, it is characterized in that,
This mobile radio station has the configuration part, and this configuration part is a benchmark with the said synchronizing channel that receives, and through after the stipulated time, sets the transmission timing of said accidental access signal.
2. mobile radio station, this mobile radio station receive and switch the synchronizing channel that purpose wireless base station sends, and send accidental access signal via RACH then, establish the up-link wireless circuit thus, it is characterized in that,
This mobile radio station has lead code generation portion; The CAZAC sequence that is used as the lead code of said accidental access signal in this lead code generation portion a plurality of CAZAC sequences that index is different is restricted to the CAZAC sequence of regulation, and utilizes the CAZAC sequence of this restriction to generate the lead code of said accidental access signal.
3. a mobile radio station is characterized in that, the CAZAC sequence of said restriction has the little character of PAPR with respect to other CAZAC sequences in said a plurality of CAZAC sequences.
4. mobile radio station; It is characterized in that; When using the Zadoff-Chu sequence as said CAZAC sequence; And, when sequence length is made as L, use the sequence of having selected index arbitrary scope of scope of scope, 2L/3～L-1 of scope from 1～L/3, L/2-L/16～L/2+L/16 as confined CAZAC sequence.
5. wireless communication system, it comprises mobile radio station, and this mobile radio station receives and switches the synchronizing channel that purpose wireless base station sends, and sends accidental access signal via RACH then, establishes the up-link wireless circuit thus, it is characterized in that,
Said wireless base station has the sending part that sends said synchronizing channel;
Said mobile radio station has the configuration part, and this configuration part is a benchmark with the said synchronizing channel that receives, and through after the stipulated time, sets the transmission timing of said accidental access signal.
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