CN201153257Y - Improved TD-SCDMA direct playing station - Google Patents
Improved TD-SCDMA direct playing station Download PDFInfo
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- CN201153257Y CN201153257Y CNU2007201966325U CN200720196632U CN201153257Y CN 201153257 Y CN201153257 Y CN 201153257Y CN U2007201966325 U CNU2007201966325 U CN U2007201966325U CN 200720196632 U CN200720196632 U CN 200720196632U CN 201153257 Y CN201153257 Y CN 201153257Y
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Abstract
An improved TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) repeater station comprises a donor antenna (216), a filter (201), a radio frequency control switch (202), a monitoring unit (203), an uplink power amplifier (204), a radio frequency digital control attenuator (208), an uplink low-noise amplifier (209), a radio frequency control switch (210), a filter (211), a retransmission antenna (212), a downlink power amplifier (213), a radio frequency digital control attenuator (214), a downlink low-noise amplifier (215), and further comprises a combinational logic arbiter (205), a downlink time-delay proportional control unit (206) and a reference frequency signal source (207). Synchronizing information is transmitted just by using a GPS (Global Positioning System) synchronization module, a TD terminal synchronization module and a base station when reference pulse signals are calibrated, so the improved TD-SCDMA repeater station saves the cost, has no place limitation and very easy implementation process.
Description
[technical field]
The utility model relates to repeater equipment in the communications field, relates in particular to the repeater equipment of a kind of TD-SCDMA (Time DivisionSynchronous Code Division Multiple Access) moving communicating field.
[background technology]
The TD-SCDMA standard is by the Institute of Telecommunication Sciences and Technology of China's Ministry of Information Industry (CATT) and Siemens cooperative development, it adopts time division duplex (TDD), the work of TDMA/CDMA multi-access mode, based on technology such as synchronization CDMA, smart antenna, software radio, joint-detection and forward variable spread spectrum coefficients, its target is that foundation has spectral efficient, high economic benefit and advanced mobile communication system.
TD-SCDMA and other 3G system have remarkable advantages: (1) according to different business, the position of transfer point can be adjusted arbitrarily between uplink downlink.When transmission symmetrical service (as speech, interactive real-time data service etc.), can select the position of conversion point of symmetry for use; When transmission non-symmetrical service (as the interconnected network mode business), can in asymmetrical position of conversion point scope, select.For above-mentioned two kinds of business, tdd mode all can provide optimal spectrum utilance and best service capacity; (2) TD-SCDMA adopts asymmetric frequency range, need not paired frequency range, system adopts the low spreading rate of 1.28Mchip/s, and spreading factor has 1,2,4,8,16 5 kind of selection, can reduce the complexity of multi-user detector like this, satisfy the different pieces of information transmission rate that 3G requires flexibly; (3) single carrier frequency bandwidth is 1.6MHz, and frame length is 5ms, and the burst that every frame comprises 7 different sign indicating number types transmits simultaneously, because its occupied bandwidth is narrow, so very big flexibility is arranged on spectrum arrangement; (4) the TDD uplink and downlink works is in same frequency, and the radio wave propagation characteristic of symmetry makes it to be convenient to utilize new technologies such as smart antenna, can reach the purpose that improves performance, reduces cost; (5) TDD system equipment cost is low, does not have the requirement that transmitting-receiving is isolated, and can use monolithic IC to realize the RF transceiver, and its cost is than FDD system low 20%～50%.
The repeater then is the important component part of communication system, be to solve communication network to extend the preferred version that covers, it compare with the base station have simple in structure, cost is low and easy for installation, by the blind area that extensively applies to be difficult to cover, such as, areas such as underground parking, elevator, harbour.Because that TD-SCDMA adopts is TDD, its provisional capital up and down is same frequency signal, and up link and down link adopt switching point separately.Therefore, how to judge accurately that the up-downgoing switching point becomes one of key technology of repeater equipment design.
The existing method of obtaining switching point mainly contains 3 kinds: the GPS module synchronously, terminal synchronizes and base station transmit synchronously.
One, the GPS module method of synchronization: GPS (Global Positioning System, the global positioning system) method of synchronization adopts the GPS synchronization module to utilize gps clock to carry out synchronously.Because GPS module cost is higher, and the infield limits by gps antenna, mainly is applicable to the base station.
Two, terminal synchronizes mode: use TD terminal synchronizes module, separate descending pilot code and carry out synchronously.Equally, the decoder module cost is also higher, and a series of problem can be brought in the terminal alms giver sector that not necessarily networks.
Three, the method for synchronization is transmitted in the base station: utilize O﹠amp between base station and repeater equipment; The M passage directly transmits base station synchronization information, sends first or second switching point information of trunking network side to, makes repeater equipment obtain first, second switching point.This mode can realize precise synchronization between each equipment, the reliability height.Constraint is too high but this scheme is subjected to engineering site, and must allow can wired connection between base station and the repeater equipment.
Because the restriction of above method, repeater basic structure commonly used at present mainly comprises donor antenna 114 as shown in Figure 1, filter 101, radio frequency control switch 102, ascending power amplifier 103, monitoring unit 104, synchronization module 105, radio frequency numerical-control attenuator 106, up low noise amplifier 107, radio frequency control switch 108, filter 109, retransmitting antenna 110, downlink power amplifier 111, radio frequency numerical-control attenuator 112, descending low noise amplifier 113; The step of wherein obtaining switching point all is to finish in various synchronization modules 105 with above methodological function.
Deficiency such as the cost height that exists at prior art, place restriction and implement comparatively complicatedly realizes the cost height, and therefore the engineering construction to operator brings certain pressure.
[utility model content]
The purpose of this utility model is to overcome above-mentioned deficiency, the TD-SCDMA repeater equipment of propose a kind of low cost, easily realizing.
For achieving the above object, technical scheme provided by the utility model is:
TD-SCDMA repeater after a kind of the improvement, comprise donor antenna 216, filter 201, radio frequency control switch 202, monitoring unit 203, ascending power amplifier 204, radio frequency numerical-control attenuator 208, up low noise amplifier 209, radio frequency control switch 210, filter 211, retransmitting antenna 212, downlink power amplifier 213, radio frequency numerical-control attenuator 214, descending low noise amplifier 215, also comprise combinational logic decision device 205, following line delay ratio control unit 206, reference frequency signal source 207, wherein combinational logic decision device 205 respectively be connected radio frequency control switch 202, radio frequency control switch 210, following line delay ratio control unit 206 and reference frequency signal source 207 connect, descend simultaneously line delay ratio control unit 206 also respectively with monitoring unit 203, reference frequency signal source 207 connects, and reference frequency signal source 207 also is connected with monitoring unit 203.
Further, described reference frequency signal source 207 comprises that circuit, battery, combinational logic circuit take place in the reference frequency signal source.
Further, described reference frequency signal source generation circuit is the element circuit that system clock or crystal oscillator maybe can be exported fixed frequency.
Further, described line delay ratio control unit 206 down comprises storage time-delay ratio unit and delayer.
In the utility model, the inventor is according to the characteristics of TD-SCDMA, in the repeater, increase a kind of reference frequency signal source, the precision in this reference frequency signal source satisfies the requirement of TD-SCDMA frame synchronization, and the way that adopts frequency division or frequency multiplication to make its output cycle be the reference pulse signal of 5ms, and by supplementary (frame synchronization information that synchronizing information is obtained is transmitted in GPS synchronization module, TD terminal synchronizes module and base station) adjust benchmark pulse enable signal its just correspondence be fixed on first up switching point of special time slot DwPTS back; After first switching point among the TD-SCDMA is decided,, make the pulse signal of time-delay back output aim at second switching point behind the delayer through the configuration delay time again the reference pulse signal of aiming at first switching point; The pulse signal of aiming at first and second switching points like this just is exactly corresponding up-downgoing switching point, and finishes the switching of uplink and downlink works by these two pulse signal control radio-frequency (RF) switch.The TD-SCDMA repeater equipment that the utility model provides, only need when the calibration reference pulse signal, use GPS synchronization module, TD terminal synchronizes module and base station to transmit synchronizing information, need GPS synchronization module and TD terminal synchronizes module be installed in inside, repeater, do not need the base station to transmit the switching that synchronizing information just can solve TD-SCDMA repeater uplink and downlink works yet, provide cost savings, and there is not the restriction in place, implementation procedure is very easy to again, so can alleviate the pressure of operator on engineering construction to a certain extent.
[description of drawings]
Fig. 1 is the structured flowchart of existing TD-SCDMA repeater;
Fig. 2 is the schematic block diagram of TD-SCDMA repeater physical channel;
Fig. 3 is the structured flowchart of the utility model TD-SCDMA repeater.
[embodiment]
Below in conjunction with specific embodiment and accompanying drawing in detail the utility model is described in detail.
At first understand the method principle that the utility model improves institute's foundation.
As everyone knows, the TD-SCDMA physical channel adopts four-layer structure: system-frame, radio frames, subframe and time slot.Be the schematic block diagram of TD-SCDMA physical channel as shown in Figure 2, be radio frames the basic time of TD-SCDMA, and the frame length of radio frames is 10ms, and each radio frames is divided into two duplicate subframes of structure, and the frame length of subframe is 5ms.Each subframe is divided into three special time slots and seven conventional time slots again.These three special time slots are respectively: DwPTS (descending pilot frequency time slot), GP (protection time slot) and UpPTS (uplink pilot time slot); Seven conventional time slots then are TS0 to TS6.In seven conventional time slots, TS0 always distributes to down link, and TS1 always distributes to up link, and switching point is arranged between the uplink downlink, and each conventional time slot is fixed as 675us.The switching point of up-downgoing has 2 in a subframe, first be fixed on after the special time slot DwPTS and GP before; Another one is according to configuration mode, may be in TS1-6 any one back.
In view of this, we establish the reference frequency signal source according to the characteristics of TD-SCDMA in the repeater of TD-SCDMA radio frequency control switch system, and this reference frequency signal source comprises that circuit, battery, combinational logic circuit take place in the reference frequency signal source.Circuit takes place in the reference frequency signal source is the element circuit that system clock or crystal oscillator maybe can be exported fixed frequency.The precision in this reference frequency signal source satisfies the frame synchronization requirement among the TD-SCDMA, adopting ways such as frequency division or frequency multiplication to make the pulse signal cycle of its output is 5ms, and by supplementary (GPS synchronization module, the frame synchronization information that TD terminal synchronizes module and base station transmission synchronizing information are obtained) obtains TD-SCDMA repeater frame synchronization information, calculate the up switching point that is fixed on special time slot DwPTS back by the frame synchronization information that obtains, and adjustment reference pulse signal phase place, make the up switching point of the reference pulse signal secured in alignment of reference frequency signal output in special time slot DwPTS back, the pulse signal of reference frequency signal source output this moment just can make the repeater switch to up operating state by combinational logic decision device control radio-frequency (RF) switch; Be the delay time that basic point calculates descending switching point with the up switching point that obtains in the said process again, and this delay time is configured in the delayer, the point that reference pulse signal is aimed at through the pulse signal of delayer time-delay back output is descending switching point, and the pulse signal of time-delay back output this moment just can make the repeater switch to the downlink working state by combinational logic decision device control radio-frequency (RF) switch.
Illustrate said process:
If circuit takes place in the reference frequency signal source that we adopt is the high stable crystal oscillator of 1MHz, through obtaining behind 5000 frequency divisions: 1MHz ÷ 5000=200Hz.The signal of 200Hz is the periodic signal of 5ms.If the signal of the base station synchronization that adopts is as a reference, then only need be first switching point of aiming at through the rising edge of reference pulse signal in the base station synchronization signal.It is as follows to adjust the method for aiming at:
(1) because TD-SCDMA system period of sub-frame is 5ms, and the time cycle of reference pulse signal also is 5ms, is reference point with first switching point in the subframe of base station, can calculate the backward reference point time of reference pulse signal is 0～5ms.
(2) because crystal oscillator is 1MHz, the cycle that then can calculate the pulse signal of crystal oscillator output is 1us.Suppose that it is Nms (0≤N≤5 that reference signal falls behind first switching point by instrument test, N can be integer, also can be decimal, being accurate to 1us gets final product), then enable the function of adjusting impulse phase, the pulse number of the crystal oscillator that swallows up output is: (5-N) * 1000, just can make reference pulse signal aim at first switching point.
The delay calculating method of configuration delayer and to finish the process of descending switch operating as follows:
Introduce us and can determine that the frame structure of each TD-SCDMA is changeless according to top, just first switching point is constant, variation be descending switching point position after possible TS1～TS6.Though the switching point of TS1-TS6 is unfixing, the duration of each conventional time slot and special time slot is fixed.According to this feature, we are reference point with first switching point, following line delay ratio control unit of design on the repeater, following line delay ratio control unit comprises storage time-delay ratio unit and delayer, what following line delay ratio control unit was controlled is descending switching controls point, and ratio of line delay ratio control unit is the uplink and downlink timeslot ratio of TS1 among the TD-SCDMA～TS6 correspondence under this.The ratio of storage time-delay ratio unit storage mainly contains 6 kinds: 1: 5,2: 4,3: 3,4: 2,5: 1,6: 0.The control time slot of correspondence is when ratio is 1: 5: up TS 1, and descending TS2-6, descending switching point is in the TS1 end point; The control time slot of correspondence is when ratio is 2: 4: up TS1-2, and descending TS3-6, descending switching point is in the TS2 end point; By that analogy, the control time slot of correspondence is when ratio is 6: 0: up TS1-6, switching point is in the TS6 end point.When line delay ratio control unit canned data was decided instantly, we had also just determined the time of time-delay, and are concrete corresponding as follows:
1, ratio is 1: 5 o'clock, and descending switching point is in the TS1 end point, and corresponding delay time is GP+UpPTS+TS1=75+125+675=875us;
2, ratio is 2: 4 o'clock, and descending switching point is in the TS2 end point, and corresponding delay time is GP+UpPTS+TS1+TS2=75+125+675+675=875+675=1550us;
3, ratio is 3: 3 o'clock, and descending switching point is in the TS3 end point, and corresponding delay time is GP+UpPTS+TS1+TS2+TS3=75+125+675+675=1550+675=2225us;
4, ratio is 4: 2 o'clock, and descending switching point is in the TS4 end point, and corresponding delay time is GP+UpPTS+TS1+TS2+TS3+TS4=2225+675=2900us;
5, ratio is 5: 1 o'clock, and descending switching point is in the TS5 end point, and corresponding delay time is GP+UpPTS+TS1+TS2+TS3+TS4+TS5=2900+675=3575us;
6, ratio is 6: 0 o'clock, and descending switching point is in the TS6 end point, and corresponding delay time is GP+UpPTS+TS1+TS2+TS3+TS4+TS5+TS6=3575+675=4250us.
Following line delay ratio control unit picks up counting from receiving reference pulse signal after obtaining delay time, reaches output pulse signal behind the delay time.This pulse signal is exactly just can aim at the signal that second switching point is descending switching point after calculating, and the pulse signal of this time-delay back output just can make the repeater switch to the downlink working state by combinational logic decision device control radio-frequency (RF) switch.
In above process, if the system time of TD-SCDMA and uplink downlink resource distribution need to adjust, then we can utilize the supervisory control system of repeater, by system time and uplink and downlink timeslot long-range or that the monitoring repeater layout setting is adjusted.Wherein, if the system time adjustment, the difference of the system time of needs adjustment convert to adjust the time that need adjust in the reference frequency signal source after, make reference frequency signal source and adjusted system time synchronous; Adjust the uplink downlink resource distribution if desired, after direct amplifying station monitoring was received configuration information, canned data got final product in the following line delay ratio control unit of adjustment.
In the above-mentioned course of work, by its just corresponding first up switching point that is fixed on special time slot DwPTS back of pulse enable signal of supplementary (frame synchronization information that synchronizing information is obtained is transmitted in GPS synchronization module, TD terminal synchronizes module and base station) adjustment benchmark, purpose is in order to guarantee the normal operation of TD-SCDMA repeater; The reference frequency signal source comprises that circuit, battery, combinational logic circuit take place in the reference frequency signal source, circuit takes place and produces the synchronizing signal identical with first switching point in the reference frequency signal source, battery guarantees that the repeater keeps the reference frequency signal source can operate as normal under the situation that not have power supply, the effect of combinational logic circuit is the phase place of adjustment reference pulse signal.
According to above method, the utility model provides the TD-SCDMA repeater after a kind of the improvement, comprise donor antenna 216, filter 201, radio frequency control switch 202, monitoring unit 203, ascending power amplifier 204, radio frequency numerical-control attenuator 208, up low noise amplifier 209, radio frequency control switch 210, filter 211, retransmitting antenna 212, downlink power amplifier 213, radio frequency numerical-control attenuator 214, descending low noise amplifier 215, also comprise combinational logic decision device 205, following line delay ratio control unit 206, reference frequency signal source 207.
Described reference frequency signal source 207 links to each other with following line delay ratio control unit 206, logical decision device 205 and monitoring unit 203 respectively, comprises that circuit, battery and combinational logic circuit take place in the reference frequency signal source that can export fixed frequency.Reference frequency signal source generation circuit can be the element circuit of system clock, crystal oscillator or other output fixed frequency etc.The main effect that circuit takes place in the reference frequency signal source is the fixing frequency signal of output; Battery mainly is to keep under the situation of repeater outage, and the system time of the TD-SCDMA that gets along well the lock in time in maintenance reference frequency signal source departs from; Combinational logic circuit mainly plays frequency division or frequency multiplication and has is to adjust impulse phase.
Described combinational logic decision device 205 is respectively with radio frequency control switch 202, radio frequency control switch 210, reference frequency signal source 207, line delay ratio control unit 206 links to each other down, mainly be to constitute by combinational logic circuit, major function is control signal and the next control signal of judging to come from the reference frequency signal source of following line delay ratio control unit, thereby can judge accurately that the repeater switches to up operating state and still switches to the downlink working state.
Described line delay ratio control unit 206 down links to each other with combinational logic decision device 205, reference frequency signal source 207 respectively, comprise storage time-delay ratio unit and delayer, major function is to pick up counting after receiving the control signal of benchmark frequency signal source, triggers the combinational logic decision device behind the delay time that has postponed to obtain and sends control signal and make the radio frequency control switch switch to the downlink working state.
Its course of work of the repeater that the utility model provides is as follows:
1, adjusts its just corresponding first up switching point that is fixed on special time slot DwPTS back of pulse enable signal of benchmark by supplementary (frame synchronization information that synchronizing information is obtained is transmitted in GPS synchronization module, TD terminal synchronizes module and base station).The pulse signal of output is through the combinational logic decision device, and combinational logic decision device control radio-frequency (RF) switch switches to up operating state, has so just kept the unimpeded of up link, has disconnected descending link simultaneously.At this moment retransmitting antenna receives signal from the space and is called upward signal, received signal is impure, may comprise some noises, these signals at first enter into the filter of repeater, filter extracts the signal of setting frequency range by filtering, and signal delivered to up low noise amplifier, faint signal is amplified.Deliver to the ascending power amplifier behind the upward signal process radio frequency numerical-control attenuator after the amplification and amplify again, be exaggerated more powerful upward signal to deliver to donor antenna, and upward signal be transmitted into the base station of appointment by donor antenna through filter.So just finish upward signal from receiving amplification, be forwarded to the function of specific base more again.
2, the line delay ratio control unit obtains the time-delay ratio from monitoring unit down, and is converted into delay time.After following line delay ratio control unit obtains delay time, pick up counting from the triggering of reference frequency signal source, send descending switching signal after reaching delay time, the downstream signal that sends is through the combinational logic decision device, the combinational logic decision device switches to up operating state to radio-frequency (RF) switch, so just keep the unimpeded of up link, disconnected descending link simultaneously.At this moment donor antenna receives signal from the space and is called downstream signal, received signal is impure, may comprise some noises, these signals at first enter into the filter of repeater, filter extracts the signal of setting frequency range by filtering, and signal delivered to descending low noise amplifier, faint signal is amplified.Deliver to downlink power amplifier behind the downstream signal process radio frequency numerical-control attenuator after the amplification and amplify again, be exaggerated more powerful downstream signal to deliver to retransmitting antenna, and downstream signal be transmitted into the place that needs covering by retransmitting antenna through filter.So just finish downstream signal from receiving amplification, covered the function of designated area more again.
In TD-SCDMA of the present utility model repeater, only need when the calibration reference pulse signal, use GPS synchronization module, terminal synchronizes and base station to transmit synchronizing information, need GPS synchronization module and TD terminal synchronizes module be installed in inside, repeater, do not need the base station to transmit the switching that synchronizing information just can solve TD-SCDMA repeater uplink and downlink works yet, provide cost savings, and there is not the restriction in place, implementation procedure is very easy to again, so can alleviate the pressure of operator on engineering construction to a certain extent.
Above-described only is better embodiment of the present utility model, and it describes comparatively concrete and detailed, can not therefore be interpreted as the restriction to the utility model claim.Should be understood that; for the person of ordinary skill of the art; under the prerequisite that does not break away from the utility model design; in the scope of technical solutions of the utility model; utilize the technology contents of above-mentioned announcement to make some changes or be modified to the equivalent embodiment of equivalent variations, these all belong to protection range of the present utility model.
Claims (4)
1, a kind of improved TD-SCDMA repeater, comprise donor antenna (216), filter (201), radio frequency control switch (202), monitoring unit (203), ascending power amplifier (204), radio frequency numerical-control attenuator (208), up low noise amplifier (209), radio frequency control switch (210), filter (211), retransmitting antenna (212), downlink power amplifier (213), radio frequency numerical-control attenuator (214), descending low noise amplifier (215), it is characterized in that, also comprise combinational logic decision device (205), following line delay ratio control unit (206), reference frequency signal source (207), wherein combinational logic decision device (205) respectively be connected radio frequency control switch (202), radio frequency control switch (210), following line delay ratio control unit (206) and reference frequency signal source (207) connect, descend simultaneously line delay ratio control unit (206) also respectively and monitoring unit (203), reference frequency signal source (207) connects, and reference frequency signal source (207) also are connected with monitoring unit (203).
2, a kind of improved TD-SCDMA according to claim 1 repeater is characterized in that: described reference frequency signal source (207) comprises that circuit, battery and combinational logic circuit take place in the reference frequency signal source.
3, a kind of improved TD-SCDMA according to claim 2 repeater is characterized in that: circuit takes place in described reference frequency signal source is the element circuit that system clock or crystal oscillator maybe can be exported fixed frequency.
4, according to claim 1,2,3 arbitrary described a kind of improved TD-SCDMA repeaters, it is characterized in that: described line delay ratio control unit (206) down comprises storage time-delay ratio unit and delayer.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2007201966325U CN201153257Y (en) | 2007-12-29 | 2007-12-29 | Improved TD-SCDMA direct playing station |
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| CNU2007201966325U CN201153257Y (en) | 2007-12-29 | 2007-12-29 | Improved TD-SCDMA direct playing station |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111565450A (en) * | 2020-01-14 | 2020-08-21 | 深圳国人无线通信有限公司 | Method and system for self-adaptively adjusting time delay of base station |
| CN113891366A (en) * | 2021-10-15 | 2022-01-04 | 中国联合网络通信集团有限公司 | Method, device, equipment, system and storage medium for controlling relay equipment |
-
2007
- 2007-12-29 CN CNU2007201966325U patent/CN201153257Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111565450A (en) * | 2020-01-14 | 2020-08-21 | 深圳国人无线通信有限公司 | Method and system for self-adaptively adjusting time delay of base station |
| CN111565450B (en) * | 2020-01-14 | 2022-05-17 | 深圳国人无线通信有限公司 | Method and system for self-adaptively adjusting time delay of base station |
| CN113891366A (en) * | 2021-10-15 | 2022-01-04 | 中国联合网络通信集团有限公司 | Method, device, equipment, system and storage medium for controlling relay equipment |
| CN113891366B (en) * | 2021-10-15 | 2024-02-06 | 中国联合网络通信集团有限公司 | Relay device control method, device, system and storage medium |
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Addressee: Guoren Communication Co., Ltd., Shenzhen Document name: Notification of Termination of Patent Right |
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Granted publication date: 20081119 Termination date: 20101229 |