CN101043248A - Method for repeater to obtain switch point in TD-SCDMA system - Google Patents
Method for repeater to obtain switch point in TD-SCDMA system Download PDFInfo
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- CN101043248A CN101043248A CN 200710052127 CN200710052127A CN101043248A CN 101043248 A CN101043248 A CN 101043248A CN 200710052127 CN200710052127 CN 200710052127 CN 200710052127 A CN200710052127 A CN 200710052127A CN 101043248 A CN101043248 A CN 101043248A
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Abstract
The invention relates to a method of direct station obtains breaking point in TD-SCDMA system; the method includes steps as following: when it is started, the direct station is switched to the state of receiving down-bound signal to receive down-bound signal; the direct station captures the time that down-bound pilot frequency signal arrives at the direct station; from the hour that the TS2 time slot ends, the hour that every time slot ends is supposed as possible time of the second switching point; determining whether the switching section is a real time switching section; processing the next time slot; when the direct station receives the up-bound pilot frequency signal for the second time, then it is recovered to normal condition to execute the ascending-descending switch of step 1-step 6. The invention adopts method of base band synchronization to obtain the information of breaking point automatically without distribution with benefactor base station, it can be worked at system that the distribution mode of ascending-descending time slot is continuously changeable, the engineering is easy to install, the cost is low, and the interference of noise to areola can be decreased efficiently.
Description
Technical field
The present invention relates to the TD-SCDMA system, is at the obtaining of up-downgoing transfer point in repeater in the TD-SCDMA system, and proposes a kind of simple Base-Band Processing scheme, and the repeater obtains the method for transfer point in a kind of specifically TD-SCDMA system.
Background technology
TD-SCDMA system (3G mobile communcations system) repeater is the same with other mobile communication system repeaters, and the repeater can strengthen the signal that base station and mobile phone send and transmit, thereby the coverage of communication network is expanded or replenished.Present existing repeater may operate in the mobile communication system of use FDD duplex modes such as GSM, IS95, CDMA2000, W-CDMA, and in these systems, the up-link wireless signal is in different frequencies with downstream wireless signals.Therefore, existing repeater has generally comprised two cover treatment systems, respectively upward signal and downstream signal is received, amplifies and processing such as emission.This two covers treatment system is operated on the different frequencies.
In the TD-SCDMA system, use the TDD duplex mode, upward signal and downstream signal are in same frequency, distinguish uplink and downlink by time-multiplexed mode.The physical channel of TD-SCDMA adopts 4 layers of structure: system-frame, radio frames, subframe and time slot/sign indicating number.Figure 1 shows that the transformat of the physical channel of TD-SCDMA.In a subframe, there is the uplink and downlink time slot simultaneously, amount to the business time-slot of 7 regular lengths.Except time slot TS0 must be used for down direction, time slot TS1 must be used for the up direction, the direction of all the other time slots can change.The corresponding descending respectively and uplink synchronous time slot of DwPTS and UpPTS, GP are the protection interval between the uplink and downlink synchronization slot.As Fig. 1; the length of a tdma frame is 10ms; be divided into two subframes; each subframe is divided into 7 conventional time slots that length is 675 μ s again, and (TS0～TS6) and 3 special time slot: DwPTS (descending pilot frequency time slot), GP (protection at interval) and UpPTS (uplink pilot time slot), their time span is respectively 75 μ s, 75 μ s, 125 μ s.According to the difference of sense, each time slot is divided into two types of up direction and down directions, and up direction is meant that the wireless signal that transmits is by subscriber terminal equipment (UE) emission in this time slot, and base station (Node-B) receives; Down direction is meant that the wireless signal that transmits is launched by Node-B in this time slot, UE receives, so the TD-SCDMA repeater needs control signal to come radio-frequency (RF) switch in the control appliance, finishes up-downgoing and switches.Two up-downgoing switching points are arranged in the TD-SCDMA system, be called as first transfer point and second transfer point respectively.First transfer point is between descending pilot frequency time slot DwPTS and uplink pilot time slot UpPTS, and the repeater switches to the reception upward signal from receiving the downstream signal state; Second transfer point is between TS1～TS6, and the repeater switches to the reception downstream signal from receiving the upward signal state.Solve the control of up-downgoing switching point, become the key technology of TD-SCDMA repeater.First transfer point was fixed with respect to the time started of each subframe; Second transfer point is variable with respect to the time started of each subframe.
Existing repeater obtains the up and following method of transfer point in the ranks and has nothing in common with each other.Particularly to second transfer point, because difficulty is big, most variations all is to want the cooperation of base station, by the positional information adding base-band information of base station with second transfer point, is come out by the repeater demodulation again.Obviously such processing scheme cost can be higher, and for an enterprise of production repeater, then will get in touch with corresponding donor base station, the second transfer point information is modulated in the specific downlink information, the repeater is found out the positional information of second transfer point again by corresponding demodulation module.
When the input of repeater does not have the useful signal input in addition, the noise signal that output presented, for the base station, make an uproar at the bottom of having uplink and downlink in the repeater.The wherein up end, make an uproar bigger for the influence of system, and the lifting that must control repeater bottom noise is within interference margins.Common direct amplification machine just might amplify the bottom noise no matter the ascending time slot the upward signal whether interior user of this service area sends all can switch to uplink state, cause interference to the sub-district.
Summary of the invention
The objective of the invention is provides repeater in a kind of TD-SCDMA system to obtain the method for transfer point by baseband-detection and system frame structure.
To achieve these goals, the technical solution adopted in the present invention is: this method comprises the steps:
After step 1. start, the repeater switches to the downstream signal state that receives, and receives downstream signal.
Step 3. is from the TS2 time slot ends, supposes that successively each time slot ends of back is the time of possible second switching point, calculates the intensity of upward signal in the time switching section Δ T.
Step 4. decides by the signal strength signal intensity that determining step 3 calculates whether this time switching section is a real time switching section, if immediately the repeater is converted to the reception downstream signal, otherwise this switching point is not a real switching point, goes to adjudicate the concluding time of next time slot again
After this time slot of step 5. finished, repeating step 4 was handled next time slot.
Step 6. is for reducing the repeater to base station interference, after the continuous n of a direct amplification machine subframe (value of n determines according to actual conditions) is not received uplink pilot signal, think that promptly all users in the service area of repeater are holding state and are not called out, direct amplification machine enters resting state, and acquiescence switches to downstream state.When the repeater is received uplink pilot signal once more, then return to normal condition rapidly, the up-downgoing of execution in step 1～step 6 is switched.
The method that the DwPTS signal is caught in above-mentioned steps 2 described repeaters can be any processing method, comprises base band coherent detection, envelope detected etc., perhaps obtains first transfer point according to GPS with footwork.
Above-mentioned steps 3 described time switching section Δ T can be the equations of propagation delay time Δ t; or the set value that obtains by reality test; in addition; the zero-time of time switching section Δ T is the finish time or the last time slot protection initial moment at interval of last time slot; or after the consideration actual conditions on above-mentioned initial moment basis, determine after postponing a time.
The computational methods of above-mentioned propagation delay time Δ t are as follows:
A, detection UpPTS signal arrive the time of repeater;
The time Δ t that experience to the initial moment that UpPTS arrives the finish time of the DwPTS signal of this subframe in B, the calculating repeater
u
C, propagation delay time Δ t=(75-Δ t
u)/2 μ s,
Propagation delay time Δ t or obtain by detecting baseband signal and other methods.
The method of the intensity of upward signal can be according to average power or measured power thresholding to be set in above-mentioned steps 3 described computing time of the switching section Δ T, or the power ratio of the same time slot method such as.
In the above-mentioned steps 4, remove TS0, the DwPTS time slot is known descending time slot, and TS1 and UpPTS time slot are that each time slot all will go to judge that the repeater is switch in uplink state or downstream state by step 4 outside the known ascending time slot.
The present invention uses the synchronous way of base band, need not to be used with donor base station, independently obtains transfer point information, being operated in up and down, the time slot allocation mode is in the system of continuous variation, convenient engineering installation, cost is low, and can effectively reduce the repeater to the interference of making an uproar of the end of sub-district.
Description of drawings
Fig. 1 is the frame structure of existing TD-SCDMA system.
Fig. 2 is the burst format figure of DwPTS time slot of the present invention.
Fig. 3 is the sub-district schematic diagram of a simple band of the present invention repeater.
Fig. 4 is the whole transfer point process flow diagram that obtains of the present invention.
Fig. 5 is the characteristic pattern of DwPTS time slot of the present invention.
Fig. 6 is a timing advance schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the process of obtaining two transfer points among the present invention is described in further detail.
Fig. 2 is the burst format of DwPTS time slot, for setting up down-going synchronous design, is launched on omnirange with maximum power by the base station, and content comprises the GP of 32 chips (chip) and the SYNC_DL of 64chips, and total time span is 75 μ s.Wherein, SYNC_DL is 64 predetermined PN sequences of a system.In the TD-SCDMA system, defined 32 descending synchronous codes (SYNC-DL) altogether, 3 fixing descending synchronous codes all will be used in each sub-district, and the descending synchronous code of neighbor cell is different.The repeater can calculate the time that SYNC-DL arrives accurately after base band is caught downlink synchronous signal, obtain the position of first transfer point.
For second transfer point, because base station signal is to terminal, terminal signaling all can experience a propagation delay time Δ t to the base station, receive in the time of its expectation for the signal that allows each terminal send the base station, can require terminal to carry previous Δ t and send signal, and base station signal also must a Δ t ability of experience incoming terminal.With the system shown in Figure 3 is example, suppose that the base station launched a down-bound pilot frequency signal constantly at t=0, if the TS2 time slot is an ascending time slot, receive the upward signal of mobile phone accurately at the TS2 time slot in order to guarantee the base station, mobile phone must be carried the previous Δ t time and just transmits constantly at t=(96+160+864) Tc-Δ t so, because direct amplification machine is nearer apart from mobile phone, can think that also the repeater can receive the mobile phone upward signal constantly at t=(96+160+864) Tc-Δ t.If but the TS2 time slot is a descending time slot, the base station can be on time at t=(96+160+864) Tc transmitting downstream signal constantly, just mean that also repeater and mobile phone constantly just can receive downstream signal at t=(96+160+864) Tc+ Δ t.Like this, if standing in the repeater angle sees, possible upward signal can be than the 2 Δ t arrival in advance of possible downstream signal, so the repeater can each time slot outside removing TS0 and TS1 before earlier the time slot of acquiescence back be ascending time slot, search upward signal in the Δ T=f (Δ t) in a time period of being determined by 2 Δ t if do not receive upward signal, thinks that then second transfer point arrives, rapidly synchro switch is switched to descendingly, just can catch up with the reception downstream signal.
If continuous at work n the subframe of direct amplification machine do not received after the uplink pilot signal, think that then all users in the service area of repeater are holding state and are not called out, direct amplification machine enters resting state, except that the UpPTS time slot switch to up all the other times all keep switching to downstream state, till receiving uplink pilot signal once more, return to normal condition.The user is in the standby in service area like this, and direct amplification machine has only seldom that the time outwards transmits, and reduces the interference of making an uproar of the up end greatly.
Fig. 4 obtains the flow chart of transfer point process for the repeater, and its concrete steps are:
Step 1, after the start, the repeater switches to the downstream signal state that receives, and receives downstream signal.
Step 3, as Fig. 6, the DwPTS time slot arrives the time delay that there is Δ t the repeater by Node B, and UE sends UpPTS for keeping will shifting to an earlier date 2 Δ t synchronously with Node B, and then repeater time of receiving UpPTS also will shift to an earlier date 2 Δ t.In the repeater, begin to clock, Δ t is arranged from the DwPTS time slot ends
uThe zero energy district, by Δ t
uCan get propagation delay time Δ t=(75-Δ t
u)/2 μ s.All promising second possible switching time of time that each time slot afterwards finishes; definition time switching section Δ T=f (Δ t); the intensity of statistics upward signal on average waits as average power or amplitude in the Δ T time period that the hangover of each time slot protection GP picks up counting.Wherein, Δ T=f (Δ t) represents that promptly Δ T is the equation of Δ t.
Step 4, with the strength ratio of the upward signal of the intensity of the signal of gained in the step 3 and front receiving and counting, or with one by measuring or estimating that a thresholding intensity level that sets compares, thereby whether decision time switching section Δ T is a real time switching section, after promptly investigating Δ T, whether immediately the repeater is converted to the reception downstream signal.
Step 5, repeating step 4 is handled next time slot.
Step 6, if if continuous at work n the subframe of direct amplification machine do not received after the uplink pilot signal, direct amplification machine enters resting state, except that the UpPTS time slot switch to up all the other times all keep switching to downstream state, till receiving uplink pilot signal once more, return to normal condition.
The content that is not described in detail in this specification belongs to this area professional and technical personnel's known prior art.
Claims (7)
1, the repeater obtains the method for transfer point in a kind of TD-SCDMA system, and it is characterized in that: this method comprises the steps:
Step 1: after the start, the repeater switches to the downstream signal state that receives, and receives downstream signal;
Step 2: direct amplification machine is by catching the time of down-bound pilot frequency signal (DwPTS) arrival repeater, find first switching point, realize being transformed into the switching that receives upward signal by receiving downstream signal for the first time, and extrapolate the time that each time slot begins and finishes;
Step 3: from the time that the TS2 time slot finishes, suppose that successively the time that each time slot of back finishes is second possible switching time, calculate the intensity of upward signal in the time switching section Δ T;
Step 4: the signal strength signal intensity of calculating by determining step 3 decides whether this time switching section is a real time switching section, if immediately the repeater is converted to the reception downstream signal, otherwise this switching point is not a real switching point, goes to adjudicate the concluding time of next time slot again;
Step 5: after this time slot finished, repeating step 4 was handled next time slot;
Step 6: after the continuous n of a direct amplification machine subframe is not received uplink pilot signal, think that promptly all users in the service area of repeater are holding state and are not called out, direct amplification machine enters resting state, acquiescence switches to downstream state, when the repeater is received uplink pilot signal once more, then return to normal condition rapidly, the up-downgoing of execution in step 1～step 6 is switched.
2, the repeater obtains the method for transfer point in the TD-SCDMA according to claim 1 system, it is characterized in that: the method that the DwPTS signal is caught in the described repeater of step 2 is any processing method, comprise base band coherent detection, envelope detected, perhaps obtain first transfer point with footwork according to GPS.
3. the repeater obtains the method for transfer point in the TD-SCDMA according to claim 1 system; it is characterized in that: the described time of step 3, switching section Δ T was the equation of propagation delay time Δ t; or the set value that obtains by reality test; the zero-time of time switching section Δ T is the finish time or the last time slot protection initial moment at interval of last time slot; or after the consideration actual conditions on above-mentioned initial moment basis, determine after postponing a time.
4, the repeater obtains the method for transfer point in the TD-SCDMA according to claim 3 system, and it is characterized in that: the computational methods of propagation delay time Δ t are:
A, detection UpPTS signal arrive the time of repeater;
The time Δ t that experience to the initial moment that UpPTS arrives the finish time of the DwPTS signal of this subframe in B, the calculating repeater
u
C, propagation delay time Δ t=(75-Δ t
u)/2us.
5, the repeater obtains the method for transfer point in the TD-SCDMA according to claim 3 system, and it is characterized in that: propagation delay time Δ t obtains by detecting baseband signal and other methods.
6, the repeater obtains the method for transfer point in the TD-SCDMA according to claim 1 system, it is characterized in that: the method for the intensity of upward signal is according to average power or measured power thresholding to be set in step 3 described computing time of the switching section Δ T, or the power comparative approach of a same time slot.
7, the repeater obtains the method for transfer point in the TD-SCDMA according to claim 1 system, it is characterized in that: in step 4, remove TS0, the DwPTS time slot is known descending time slot, TS1 and UpPTS time slot are that each time slot all will go to judge that the repeater is switch in uplink state or downstream state by step 4 outside the known ascending time slot.
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| CN200710052127A CN100576773C (en) | 2007-04-30 | 2007-04-30 | The repeater obtains the method for transfer point in a kind of TD-SCDMA system |
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| CN101925154A (en) * | 2009-06-09 | 2010-12-22 | 鼎桥通信技术有限公司 | Method for reducing interference of home base station |
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| CN101483477B (en) * | 2008-12-30 | 2012-10-24 | 珠海银邮光电技术发展股份有限公司 | Method for automatically obtaining the second break point by TD-SCDMA repeater |
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| CN101483477B (en) * | 2008-12-30 | 2012-10-24 | 珠海银邮光电技术发展股份有限公司 | Method for automatically obtaining the second break point by TD-SCDMA repeater |
| CN101925154A (en) * | 2009-06-09 | 2010-12-22 | 鼎桥通信技术有限公司 | Method for reducing interference of home base station |
| CN102238721B (en) * | 2010-04-29 | 2015-11-25 | 联芯科技有限公司 | terminal synchronous timing control method and device |
| CN102238721A (en) * | 2010-04-29 | 2011-11-09 | 联芯科技有限公司 | Terminal synchronous timing control method and device |
| CN103297065A (en) * | 2012-02-23 | 2013-09-11 | 中兴通讯股份有限公司 | Emulation device and method for adjusting time sequence of radio frequency transceiving thereof |
| CN103297065B (en) * | 2012-02-23 | 2016-06-29 | 中兴通讯股份有限公司 | A kind of method of adjustment of hard emulator and radio-frequency receiving-transmitting sequential thereof |
| US9497675B2 (en) | 2012-03-16 | 2016-11-15 | Fujitsu Limited | Method and apparatus for judging type of handover failure |
| WO2013134955A1 (en) * | 2012-03-16 | 2013-09-19 | 富士通株式会社 | Handoff failure type determination method and device thereof |
| WO2014082503A1 (en) * | 2012-11-27 | 2014-06-05 | 中兴通讯股份有限公司 | Method and device for downlink synchronization tracking during td-scdma switching |
| CN107078788A (en) * | 2014-11-06 | 2017-08-18 | 康普技术有限责任公司 | The high-speed capture of down link data and analysis in telecommunication system |
| CN107078788B (en) * | 2014-11-06 | 2020-06-30 | 康普技术有限责任公司 | High speed acquisition and analysis of downlink data in a telecommunications system |
| CN106792837A (en) * | 2017-02-22 | 2017-05-31 | 东南大学 | A kind of up-downgoing changing method of TD LTE systems |
| CN106792837B (en) * | 2017-02-22 | 2020-03-31 | 东南大学 | Uplink and downlink switching method of TD-LTE system |
| CN109348506A (en) * | 2018-11-05 | 2019-02-15 | 上海创远仪器技术股份有限公司 | Realize that TD-SCDMA signal meets the method and system of switch time template determination processing in mobile communication system |
| CN109348506B (en) * | 2018-11-05 | 2022-07-05 | 上海创远仪器技术股份有限公司 | Method and system for realizing TD-SCDMA signal satisfying switch time template decision processing in mobile communication system |
| CN112243274A (en) * | 2019-07-17 | 2021-01-19 | 大唐移动通信设备有限公司 | Timing switching processing method and device based on time |
| CN112243274B (en) * | 2019-07-17 | 2021-10-22 | 大唐移动通信设备有限公司 | Timing switching processing method and device based on time |
| CN116505971A (en) * | 2023-06-20 | 2023-07-28 | 北京唯得科技有限公司 | Signal processing method and device and electronic equipment |
| CN116505971B (en) * | 2023-06-20 | 2023-10-03 | 北京唯得科技有限公司 | Signal processing method and device and electronic equipment |
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