CN100426935C - Method and device for uplink random physical channel access in multiple small cell - Google Patents
Method and device for uplink random physical channel access in multiple small cell Download PDFInfo
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- CN100426935C CN100426935C CNB2006101431113A CN200610143111A CN100426935C CN 100426935 C CN100426935 C CN 100426935C CN B2006101431113 A CNB2006101431113 A CN B2006101431113A CN 200610143111 A CN200610143111 A CN 200610143111A CN 100426935 C CN100426935 C CN 100426935C
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Abstract
This invention discloses a method for accessing multi-area up random physical channels including: setting the access sub-channel and screen access time slot of each area, when access sub-channels allowing said area to up-access exist in the access time slot corresponding to the access sub-channel to the occupation time slot having received said information of the local area, they are set in the screen access time slot, when the leading signal is tested to be successfully on the current sub-channel to be accessed, the access of the up random physical channel is finished then a being accessed area is re-set. This invention also discloses a device for accessing the physical channels.
Description
Technical field
The present invention relates to the method and apparatus that a kind of many cell uplinks random physical channel inserts, relate to the method and apparatus that a kind of many cell uplinks random physical channel that is applied to the high speed scene inserts especially, belong to communication technical field.
Background technology
All set up quite ripe quick arterial traffic network in developed countries such as Europe, Japan.The speed of these high-spe-ed trunk lines generally more than 200km/h, some main line even surpassed 300km/h.In China, the Shanghai magnetic suspension that also taken the lead in having built up, speed per hour is especially up to 431km/h, among is also planning to many high-spe-ed trunk lines such as high-speed railway in Shanghai to magnetic suspension, the Beijing in Hangzhou in Shanghai.How to provide the good network covering quality in above-mentioned high velocity environment, be the difficult problem that mobile operator and mobile device provider face jointly.
Communication under the high-speed moving state faces a more difficult problem than the communication under inactive state or the lower-speed state, and Doppler effect is exactly wherein the most outstanding one.Doppler effect refers to: in the mobile communication system, because portable terminal and relatively moving of base station make the frequency of received signal expand.When portable terminal during at high-speed motion state, signal between base station and the portable terminal is propagated and is the direct-view footpath, Doppler effect directly is presented as received signal frequency integral shift, when base station and road are very near, the angle of motion of mobile terminals direction and signal propagation direction is very little, and signal will receive bigger frequency deviation.The schematic diagram that is communication system frequency deviation generation under the high-speed moving state shown in Figure 1.
By shown in Figure 1, if the signal of base station transmission frequency is f
0, when portable terminal during away from the base station, the downstream signal that portable terminal receives will have frequency deviation f
d, (Automatic Frequency Correction, AFC) technology locks the received signal frequency f of best server cell to portable terminal by the automatic frequency compensation
0-f
d, and with this locking frequency f
0-f
dSend upward signal as the reference benchmark, base station received signal sends signal with respect to it will produce 2f
dFrequency deviation, and
Wherein: f
0Be Wideband Code Division Multiple Access (WCDMA) (Wide-band Code Division Multiple Access, WCDMA) carrier frequency, C is a propagation velocity of electromagnetic wave, and v is the portable terminal translational speed, and θ is the angle of direction of relative movement and signal propagation direction between portable terminal and the base station.According to above-mentioned algorithm, when portable terminal during with the speed high-speed motion of 250km/h, 2f
dCorresponding maximum frequency deviation can reach 926Hz.
In the WCDMA system, because being the mode that adopts coherent demodulation to detect, the base station works, thereby the local demodulation carrier wave of receiving terminal must with the modulated carrier of transmitting terminal with homophase frequently, and under the high speed scene, be subjected to the influence of Doppler effect, often there is bigger frequency difference between base station carrier and the portable terminal received signal, the selection of channel estimating smooth length is difficult in filtering noise and follows the tracks of fast and obtains balance between the channel fading, demodulation performance may seriously descend, even cause normally demodulation of received signal, and for this self-interference of WCDMA system, the decline of demodulation performance means the reduction of capacity and covering.
For the WCDMA system, Physical Random Access Channel (Physical Random AccessChannel, PRACH) be the ascending physical signal common signal channel, its transmission structure comprises leading (Preamble) and two parts of random accessing message (Message), as shown in Figure 2, in carrying out random access procedure, portable terminal at first sends the targeting signal of 4096chip at certain access slot, and adopt the mode of power climbing to continue to send at the up access slot of system assignment with the minimum interval of setting, receive the base station by AICH Acquisition Indication Channel (Acquisition Indicator Channel up to this portable terminal, what AICH) send catches indication (Acquisition Indicator, AI) information or reach the maximum number of times of transmission of default, above-mentioned AI information is that the base station sends after detecting targeting signal, portable terminal receives AI information, after promptly obtaining the forward affirmation, to send the message part of 10ms or 20ms at the follow-up supervention in access timing interval, thereby finish the access procedure of a uplink random access physical channel by system's initial setting.
In above-mentioned random access procedure, whether portable terminal sends targeting signal, be unknown for the base station, therefore, in the prior art, system definition up access slot, the time of up access time slot occupation 5120chip, be the twice of generalized slot in the WCDMA system, each up 20ms inserts frame and is divided into 15 up access slots, sequence number from 0 to 14; Simultaneity factor has also defined the access subchannel, an access subchannel and a up access slot overlap in time, different sequence numbers is just arranged, insert the definition from 0 to 11 of subchannel sequence number, Fig. 3 is above-mentioned up access slot and the corresponding relation figure that inserts subchannel, as can be seen from the figure, this corresponding relation is that one-period carries out repetition with 4 up 20ms access frames.
The targeting signal that whether has portable terminal to send is regularly detected in the base station in the time slot of certain up access subchannel.If 3 sub-districts are supported in a base station, the access lead signal of all portable terminals in 3 sub-districts need be detected in the base station, and the corresponding message signale of demodulation, thereby guarantees that portable terminal sends the correct reception that inserts data in all sub-districts.
But for above-mentioned WCDMA system random access process, the base station can not know that still portable terminal sends the prior information of signal frequency deviation, and the PRACH signal time is shorter each time, the base station is the estimated signal frequency deviation in the short period of time, carries out coherent detection or demodulation after correcting to received signal again.To this, under the high speed scene, the access device of up PRACH channel usually as shown in Figure 4 in the prior art, this device comprises mixes baseband signals unit, first detection/demodulation/decoding unit, second detection/demodulation/decoding unit, the 3rd detection/demodulation/decoding unit, detection of preamble decision unit and control unit, wherein:
The mixes baseband signals unit, the sub-district input signal that is used for receiving carries out Frequency mixing processing, input signal be multiply by complex signal respectively that is:
With
And the result exported to first detection/demodulation/decoding unit, second detection/demodulation/decoding unit and the 3rd detection/demodulation/decoding unit respectively, wherein: ω
1, ω
2And ω
3Can in the frequency deviation region that the WCDMA system is stood, be provided with arbitrarily;
First detection/demodulation/decoding unit is used for the signal that the base band mixing unit that receives is exported is carried out detection of preamble, that is: it is relevant to do coupling with the access scrambler of this sub-district, and detected targeting signal is outputed to the detection of preamble decision unit; After receiving the Message Processing signal that control unit sends, separate and be in harmonious proportion decoding inserting message signale that timing receives after at interval, and will separate the result who is in harmonious proportion after the decoding and send to the sub-district;
Second detection/demodulation/decoding unit is used for the signal that the base band mixing unit that receives is exported is carried out detection of preamble, that is: it is relevant to do coupling with the access scrambler of this sub-district, and detected targeting signal is outputed to the detection of preamble decision unit; After receiving the Message Processing signal that control unit sends, separate and be in harmonious proportion decoding inserting message signale that timing receives after at interval, and will separate the result who is in harmonious proportion after the decoding and send to the sub-district;
The 3rd detection/demodulation/decoding unit is used for the signal that the base band mixing unit that receives is exported is carried out detection of preamble, that is: it is relevant to do coupling with the access scrambler of this sub-district, and detected targeting signal is outputed to the detection of preamble decision unit; After receiving the Message Processing signal that control unit sends, separate and be in harmonious proportion decoding inserting message signale that timing receives after at interval, and will separate the result who is in harmonious proportion after the decoding and send to the sub-district;
The detection of preamble decision unit, three road targeting signal detected values that first detection/demodulation/decoding unit, second detection/demodulation/decoding unit and the 3rd detection/demodulation/decoding unit that is used for receiving is imported and the detection of preamble threshold value of setting compare, when the detected value of one road targeting signal surpasses the detection of preamble threshold value of wherein setting, send leading confirmation signal to control unit;
Control unit, receive leading confirmation signal after, send the AI indication at the AICH of sub-district channel, send the Message Processing signal to first detection/demodulation/decoding unit, second detection/demodulation/decoding unit and the 3rd detection/demodulation/decoding unit simultaneously.
Illustrate a bit: in the prior art, the mixes baseband signals unit also can be set at the Frequency mixing processing of carrying out any multiple signals, considers that based on resource and performance synthesis multiselect is got the Frequency mixing processing of 3 road signals in the prior art.
As shown in Figure 5, in the prior art under the high speed scene, the flow chart of the method that up PRACH channel inserts, this method comprises:
Step 101 is carried out Frequency mixing processing to the input signal of fixed cells CellX, promptly multiply by complex signal respectively
With
ω
1, ω
2And ω
3Can in the frequency deviation region that the WCDMA system is stood, be provided with arbitrarily;
Step 102 is carried out targeting signal respectively to 3 tributary signals after the Frequency mixing processing and is detected, that is, it is relevant to make coupling with the access scrambler of sub-district, and exports corresponding multipath detection of preamble signal;
Step 103, the multipath detection of preamble signal that 3 branch roads are detected carries out prize judgment, when one road targeting signal detected value surpasses the detection of preamble thresholding of setting, confirms the detection of preamble success, sends the AI indication of sub-district;
Step 104 after inserting timing, is carried out demodulation to the message signale that receives, and is sent correct decode results according to the message signale after the demodulation, sends to fixed cells CellX.
In the above-described embodiments, need the message signale of the signal of demodulation in the step 104 for all branch roads.In another case, also may be that the corresponding message signal that only will receive the detection of preamble branch road is separated mediation decoding, this moment is in said apparatus, when the detection of preamble decision unit sends to control unit with leading confirmation signal, the detected value that also this signal is sent to the detection of preamble signal surpasses the detection/demodulation/decoding unit of the detection of preamble threshold value of setting, after detection/demodulation/decoding unit receives leading confirmation signal and Message Processing signal, just the message signale that receives is separated be in harmonious proportion and deciphered, and the result is sent to the sub-district.Preestablish by system for the selection that needs restituted signal.
In above-mentioned steps, if separately Signal Processing can be tolerated the frequency deviation of positive and negative 500Hz, the frequency configuration of pre-mixing is 1000Hz, 0Hz and-1000Hz, system will tolerate that the excursion of receiving signal frequency offset is positive and negative 1500Hz.
As seen, in the prior art, utilize many cover searching resources only to handle the access signal of a sub-district all the time, the fixing signal that receives a sub-district is also only exported the testing result of a sub-district; Thereby the high speed scene is when using, for supporting higher positive negative frequency deviation user to insert the correct detection and the demodulation of signal, to consume hardware resource exponentially, make the resource that can support a plurality of sub-districts to handle originally can only support the access of a cell uplink PRACH channel now, the sub-district specification that system supports descends.
Summary of the invention
The present invention promptly is the method and apparatus that a kind of many sub-districts access channel that proposes at the shortcoming that exists in the above-mentioned prior art receives, and can utilize less hardware resource to realize the reliable access of cell uplink PRACH channel in the high speed scene.
To achieve the above object of the invention, the invention provides the method that a kind of many cell uplinks random physical channel inserts, comprising:
The access subchannel and the shielding access slot of each sub-district are set, insert the pairing access slot of subchannel when the sub-district and also exist in the time slot when allowing this sub-district to carry out the access subchannel of up access to receiving taking of this sub-district message, the access subchannel that this permissions is inserted is arranged on and shields in the access slot;
Insert when detecting the targeting signal success on the subchannel in current sub-district to be accessed, the uplink random physical channel of finishing this sub-district inserts, and resets a current sub-district to be accessed then;
Insert when detecting the targeting signal success on the subchannel in current sub-district to be accessed, the access channel of finishing this sub-district receives, and resets a current sub-district to be accessed then;
When on the access subchannel of current sub-district to be accessed, not detecting targeting signal, reset a current sub-district to be accessed.
Further, described shielding access slot is arranged on last a plurality of access slots of each up access frame.
Further, the described access subchannel that each sub-district is set is achieved in that the access subchannel that distributes different sequence numbers for different sub-districts respectively.
Further, the access of described current sub-district to be accessed is predefined by system in proper order.
Further, the pairing access slot of access subchannel of described sub-district is an access slot.
The device that the present invention also provides a kind of many cell uplinks random physical channel to insert comprises: mixes baseband signals unit, above detection/demodulation/decoding unit, detection of preamble decision unit and a control unit, it is characterized in that,
The mixes baseband signals unit is used for determining current sub-district to be accessed according to the selected cell information of control unit output, behind the detection signal that receives control unit output, receives the input signal of current sub-district to be accessed on current access subchannel;
The detection of preamble decision unit is used for sending switching signal to control unit when the detected value of all detection of preamble signals of detection/demodulation/decoding unit input all surpasses the detection of preamble threshold value of setting;
Detection/demodulation/decoding unit is used for the information of receiving separated and is in harmonious proportion after the decoding, sends the sub-district switching signal to control unit;
Control unit is used to be provided with the shield detection time slot; Each sub-district is set is used to mate relevant access scrambler; Also be used to be provided with and allow each sub-district to carry out the access subchannel that targeting signal detects, and, send the scrambler of current sub-district to be accessed to mixes baseband signals unit transmission detection signal, to described detection/demodulation/decoding unit in the access subchannel zero hour of knowing current sub-district to be accessed; When receiving the sub-district switching signal, redefine current sub-district to be accessed, and send selected cell information to the mixes baseband signals unit.
Further, control unit is provided with that to allow each sub-district to carry out the access subchannel that targeting signal detects be such: distribute the row of different sequence numbers to insert subchannel respectively for different sub-districts.
Further, the pairing access slot of the available access subchannel of first of current sub-district to be accessed is to receiving the taking in the time slot of this sub-district message, and Sub-Channel Number is arranged in the shielding access slot for the access subchannel that allows this sub-district to insert.
Further, described detection of preamble decision unit, also when leading confirmation signal is sent to control unit, this signal is sent to the detection/demodulation/decoding unit of the detected value of detection of preamble signal above the detection of preamble threshold value of setting, after described detection/demodulation/decoding unit receives leading confirmation signal and Message Processing signal, the message signale that receives is separated mediation decoding.
Compared with prior art, the present invention has following remarkable advantage:
(1) the present invention is by each sub-district received signal alternate treatment, and identical hardware handles resource can be handled the reception of a plurality of high speed cell uplink PRACH channels, and the sub-district of system's support is counted specification and can not descended;
(2) by in up access frame, the shielding access slot being set, and each sub-district is provided with definite up access subchannel, can guarantee the timely switching of each sub-district access signal processing, guarantee the justice that each sub-district is inserted, avoid arbitrary sub-district waits for too long when carrying out up access;
(3) the present invention can also avoid the detection of preamble signal repeatedly the system uplink that causes of power climbing disturb and increase.
Description of drawings
Fig. 1 is under the high-speed moving state, the schematic diagram that the communication system frequency deviation produces;
Fig. 2 is that the PRACH channel sends schematic diagram in the WCDMA system;
Fig. 3 is the up access slot of WCDMA system in the prior art and the corresponding relation figure that inserts subchannel;
Fig. 4 is the block diagram of up PRACH channel access device under the prior art high speed scene;
Fig. 5 is the realization flow figure of up PRACH channel access method under the prior art high speed scene;
Fig. 6 is for supporting that for base station in the specific embodiment of the invention block diagram of up PRACH channel access device is realized in three sub-districts under 3 cell conditions;
Fig. 7 is that a base station supports under 3 cell conditions that the method flow diagram that up PRACH channel inserts is realized in three sub-districts in the specific embodiment of the invention;
Fig. 8 is that a base station supports that under 3 cell conditions, up PRACH inserts the schematic diagram that subchannel distributes in the specific embodiment of the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to introduce further, but not as a limitation of the invention.
Before following examples are narrated, at first the shielding access slot is done a definition, the shielding access slot is a special time slot in the up access frame, on the pairing access subchannel of this time slot, do not do any detection of preamble, send error message after perhaps detecting targeting signal, promptly in the shielding access slot, can not produce effective detection of preamble signal.
For comparative preferably being arranged, be example also in following examples with 3 branch road mixes baseband signals with prior art.As shown in Figure 6, the device that a kind of many cell uplinks PRACH channel inserts comprises: mixes baseband signals unit, first detection/demodulation/decoding unit, second detection/demodulation/decoding unit, the 3rd detection/demodulation/decoding unit, detection of preamble decision unit and control unit, wherein:
The mixes baseband signals unit, be used for determining current sub-district to be accessed according to the selected cell information of control unit output, after receiving detection signal, the input signal of the current access slot in sub-district current to be accessed that receives is carried out Frequency mixing processing, that is: input signal be multiply by complex signal respectively
With
And the result exported to first detection/demodulation/decoding unit, second detection/demodulation/decoding unit and the 3rd detection/demodulation/decoding unit respectively, wherein: ω
1, ω
2And ω
3Can in the frequency deviation region that the WCDMA system is stood, be provided with arbitrarily;
First detection/demodulation/decoding unit, be used to receive the access scrambler of control unit output, the signal that the base band mixing unit that receives is exported carries out detection of preamble, that is: it is relevant to do coupling with the access scrambler of present access subzone, and detected targeting signal is outputed to the detection of preamble decision unit; After receiving the Message Processing signal that control unit sends, separate and be in harmonious proportion decoding inserting message signale that timing receives after at interval, and will separate the result who is in harmonious proportion after the decoding and send to present access subzone;
Second detection/demodulation/decoding unit, be used to receive the access scrambler of control unit output, the signal that the base band mixing unit that receives is exported carries out detection of preamble, that is: it is relevant to do coupling with the access scrambler of present access subzone, and detected targeting signal is outputed to the detection of preamble decision unit; After receiving the Message Processing signal that control unit sends, separate and be in harmonious proportion decoding inserting message signale that timing receives after at interval, and will separate the result who is in harmonious proportion after the decoding and send to present access subzone;
The 3rd detection/demodulation/decoding unit, be used to receive the access scrambler of control unit output, the signal that the base band mixing unit that receives is exported carries out detection of preamble, that is: it is relevant to do coupling with the access scrambler of present access subzone, and detected targeting signal is outputed to the detection of preamble decision unit; After receiving the Message Processing signal that control unit sends, separate and be in harmonious proportion decoding inserting message signale that timing receives after at interval, and will separate the result who is in harmonious proportion after the decoding and send to present access subzone;
The detection of preamble decision unit, being used for receiving first detection/demodulation/decoding unit, second detection/demodulation/decoding unit and the 3rd detection/demodulation/three road leading inspection signal measured values of decoding unit input compares with the detection of preamble threshold value of wherein setting, when the detected value of one road targeting signal surpasses the detection of preamble threshold value of wherein setting, send leading confirmation signal to control unit; When the detected value of three road targeting signals does not all surpass the detection of preamble threshold value of setting, send switching signal to control unit;
Control unit, be used for the shielding access slot being set at up access frame, this shielding access slot makes that in any one sub-district to be accessed access procedure first pairing access slot of up access subchannel that can be used for the targeting signal detection does not have corresponding available current area to insert subchannel to receiving taking of this sub-district message in the time slot; Setting and storage are used for the relevant access scrambler of each sub-district coupling; Also be used to be provided with and allow each sub-district to carry out the up access Sub-Channel Number that targeting signal detects; Determine current sub-district to be accessed, and insert subchannel zero hour in this sub-district, send detection signal to the mixes baseband signals unit, and corresponding scrambler is offered above-mentioned each detection/demodulation/decoding unit; When receiving leading confirmation signal, send the AI indication to the AICH of current sub-district to be accessed channel; When receiving the sub-district switching signal, redefine current sub-district to be accessed, and send selected cell information to the mixes baseband signals unit according to transfer sequence strategy at current cell setting to be accessed.
Said apparatus is done some explanation: because the timing of the timing of up access frame and descending access frame is corresponding, and the frame of the descending transmission of different districts regularly is fully known in the system, control unit can be known up access slot at initial time thus, and can by regularly or other modes know correlation times such as access subchannel zero hour of current sub-district to be accessed.
As shown in Figure 7, the method that a kind of many cell uplinks PRACH channel inserts comprises the steps:
Step 202 is carried out targeting signal and is detected on current access subchannel in sub-district to be accessed;
In this step, targeting signal detects the method that can adopt prior art: at first input signal is carried out Frequency mixing processing, then 3 tributary signals after the Frequency mixing processing are carried out targeting signal respectively and detect, promptly, it is relevant to make coupling with the access scrambler of sub-district, and exports corresponding multipath targeting signal;
Step 203 judges whether detection of preamble is successful, if, send the AI indication of this sub-district, execution in step 204, if not, execution in step 205;
In this step, judge whether success also can utilize method described in the prior art to realize to detection of preamble, that is: the multipath information that 3 branch roads are detected is carried out prize judgment, when one road targeting signal detected value surpasses the detection of preamble thresholding, confirms the detection of preamble success;
Step 204 after inserting the timing interval, receives the message signale that current area sends, and message signale is separated mediation decoding, sends to current area; Execution in step 205 then;
In this step implementation, the message that receives separated to be in harmonious proportion decoding also same as the prior art, do not repeat them here;
Step 205 according to predefined sub-district switchover policy, redefines new sub-district to be accessed, returns execution in step 202, and switchover policy described herein is in advance by the sub-district access order of default.
The length of the access message frame of being mentioned in the above-mentioned steps is to be preestablished by RNC, and the notice portable terminal.
In the above-described embodiments, need the message signale of the signal of demodulation in the step 204 for all branch roads.In another case, also may be that the corresponding message signal that only will receive the detection of preamble branch road is separated mediation decoding, this moment is in said apparatus, when the detection of preamble decision unit sends to control unit with leading confirmation signal, the detected value that also this signal is sent to the detection of preamble signal surpasses the detection/demodulation/decoding unit of the detection of preamble threshold value of setting, after detection/demodulation/decoding unit receives leading confirmation signal and Message Processing signal, just the message signale that receives is separated be in harmonious proportion and deciphered, and the result is sent to the sub-district.Preestablish by system for the selection that needs restituted signal.
Below with one more specifically embodiment method of the present invention is done further explanation, 3 sub-district Cell0 are supported in a base station among this embodiment, Cell1, Cell2, access timing between leading at last (portable terminal detects AI, and just no longer the continuation transmission is leading) that portable terminal sends in this system and message send is set at 3 and inserts the pairing time slot of subchannel, setting and inserting message frame is 20ms length, also set in each up access frame last five pairing time slots of subchannel (being the dash area among Fig. 8) and be the shielding access slot, promptly do not do any detection of preamble, send error message after perhaps detecting targeting signal.
With sequence number is that 0,3 and 6 access subchannel is distributed to Cell0, Cell1, three sub-districts of Cell2 respectively, then the schematic diagram that up PRACH access subchannel distributes in this method as shown in Figure 8, if up access Y0 frame is distributed to Cell0, each sub-district realizes that the method for up PRACH channel access is as follows:
If insert the targeting signal that subchannel detects Cell0 at Y0-X0, then receive message signale to Y1-X2 in the time at corresponding Y0-X3, even Y0-X12 is the access subchannel of sub-district 0, also no longer carrying out targeting signal detects, after perhaps detecting targeting signal, send AI and be designated as-1, the up access 20ms frame of Y1 correspondence is the access lead signal of detected cells Cell0 no longer also, perhaps detect leading after, send AI and be designated as-1, after guaranteeing that with this Y1 subframe receives message fully, up access frame Y2 can switch to the processing of carrying out sub-district Cell1 received signal the zero hour;
If insert the targeting signal that subchannel does not detect sub-district Cell0 at Y0-X0, then switch to sub-district Cell1 the zero hour at up access frame Y1, and at the targeting signal of the non-shielding access slot of current access frame detected cells Cell1, when the targeting signal that detects sub-district Cell1, then in the message transmitting time of this up access frame and next up access frame correspondence, receive, otherwise next up access frame switches to the processing of next sub-district Cell2 the zero hour again;
Analogize according to said process, receive the leading and message signale of different districts in turn.
From above-mentioned implementation procedure as can be seen, if system supports the processing of 3 sub-districts, it is that 3 up 20ms insert frame, i.e. 60ms that the minimum interval that twice targeting signal of switching detect is striden in sub-district; If each sub-district all detects targeting signal, receive corresponding message signale, then the switching interval of the twice targeting signal detection in front and back is maximum, corresponding 6 up 20ms insert frame, i.e. 120ms.
In another embodiment, can be 10ms also with the length that inserts message frame, after detecting targeting signal, insert according to the method described above, each sub-district has the shorter processing time like this.
What it may be noted that a bit is, the shielding access slot is not restricted to last several time slots of the up access frame of each described in the foregoing description, also can be arranged on any up access slot position of definite up access frame, but in the sub-district of same setting in the processing time, the shielding access slot the time that need guarantee between preceding two the available detection of preamble subchannels in this sub-district is set.At this moment, the processing time of each sub-district may be different, and the switching of minizone may not be periodic yet.
In above-mentioned implementation procedure, each sub-district only distributes an access subchannel to carry out the detection of access lead signal, under this set, if also be set to the power ramp step-length less, 1dB for example, then the number of times of the leading transmission of community user is limited in the leading up access frame of non-detection, power ramp also is limited, the influence of the ascending load that causes therefrom is also less, thereby alleviated the soaring influence to system of pilot power, the access delay demand for the little high speed coverage cell of capacity also is satisfiable simultaneously.
In other embodiments, as long as satisfy the delay requirement of system design, access subchannel that also can the access lead signal is set to two or more, but the access subchannel sequence number of the access lead signal of any two sub-districts is different.
What need explanation a bit is: embodiments of the invention all support that with a base station 3 sub-districts are example, but when supporting many sub-districts more than 2 for base station, many sub-districts access channel receives still can similarly adopt the mentioned apparatus and method of the present invention.
To what the present invention also needed to illustrate a bit be, the present invention not only is applicable to the WCDMA system, also be applicable to the cdma system that other adopts time division mechanism to insert, the present invention is applicable to not only that also many cell uplinks PRACH channel inserts under the high speed scene, is applicable to that also many cell uplinks PRACH channel inserts under other scenes.
Claims (9)
1. the method that inserts of cell uplink random physical channel more than a kind comprises:
The access subchannel and the shielding access slot of each sub-district are set, insert the pairing access slot of subchannel when the sub-district and also exist in the time slot when allowing this sub-district to carry out the access subchannel of up access to receiving taking of this sub-district message, the access subchannel that this permissions is inserted is arranged on and shields in the access slot;
Insert when detecting the targeting signal success on the subchannel in current sub-district to be accessed, the uplink random physical channel of finishing this sub-district inserts, and resets a current sub-district to be accessed then;
When on the access subchannel of current sub-district to be accessed, not detecting targeting signal, reset a current sub-district to be accessed.
2. the method for claim 1 is characterized in that, described shielding access slot is arranged on last a plurality of access slots of each up access frame.
3. the method for claim 1 is characterized in that, the described access subchannel that each sub-district is set is achieved in that the access subchannel that distributes different sequence numbers for different sub-districts respectively.
4. the method for claim 1 is characterized in that, the access of described current sub-district to be accessed is predefined by system in proper order.
5. the method for claim 1 is characterized in that, the pairing access slot of access subchannel of described sub-district is an access slot.
6. the device that inserts of cell uplink random physical channel more than a kind comprises: mixes baseband signals unit, above detection/demodulation/decoding unit, detection of preamble decision unit and a control unit, it is characterized in that,
The mixes baseband signals unit is used for determining current sub-district to be accessed according to the selected cell information of control unit output, behind the detection signal that receives control unit output, receives the input signal of current sub-district to be accessed on current access subchannel;
The detection of preamble decision unit is used for sending switching signal to control unit when the detected value of all detection of preamble signals of detection/demodulation/decoding unit input all surpasses the detection of preamble threshold value of setting;
Detection/demodulation/decoding unit is used for the information of receiving separated and is in harmonious proportion after the decoding, sends the sub-district switching signal to control unit;
Control unit is used to be provided with the shield detection time slot; Each sub-district is set is used to mate relevant access scrambler; Also be used to be provided with and allow each sub-district to carry out the access subchannel that targeting signal detects, and, send the scrambler of current sub-district to be accessed to mixes baseband signals unit transmission detection signal, to described detection/demodulation/decoding unit in the access subchannel zero hour of knowing current sub-district to be accessed; When receiving the sub-district switching signal, redefine current sub-district to be accessed, and send selected cell information to the mixes baseband signals unit.
7. device as claimed in claim 6 is characterized in that, it is such that control unit is provided with the access subchannel that allows each sub-district to carry out the targeting signal detection:
Distribute the row of different sequence numbers to insert subchannel respectively for different sub-districts.
8. device as claimed in claim 7, it is characterized in that, the pairing access slot of the available access subchannel of first of current sub-district to be accessed is to receiving the taking in the time slot of this sub-district message, and Sub-Channel Number is arranged in the shielding access slot for the access subchannel that allows this sub-district to insert.
9. device as claimed in claim 6, it is characterized in that, described detection of preamble decision unit, also when leading confirmation signal is sent to control unit, this signal is sent to the detection/demodulation/decoding unit of the detected value of detection of preamble signal above the detection of preamble threshold value of setting, after described detection/demodulation/decoding unit receives leading confirmation signal and Message Processing signal, the message signale that receives is separated mediation decoding.
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| CN101365222B (en) * | 2007-08-10 | 2011-05-04 | 上海华为技术有限公司 | Reverse sharing signaling channel access method, mobile station and base station |
| WO2012103706A1 (en) * | 2011-06-24 | 2012-08-09 | 华为技术有限公司 | Random access method, base station control device and base station |
| US9374717B2 (en) * | 2012-03-19 | 2016-06-21 | Qualcomm Incorporated | Transmitting indication of access point loading |
| CN107534997B (en) * | 2015-04-16 | 2021-08-03 | 瑞典爱立信有限公司 | Method in a network node for providing a device with access to a network |
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